CN111800172B - Communication method and device - Google Patents

Abstract

The application provides a communication method and device. The method comprises the following steps: a completely new indication field is introduced in the CSI. Specifically, by reporting the union of the frequency domain basis vectors corresponding to all spatial layers, vectors which are not selected in the candidate frequency domain basis vector set are eliminated, and the size of the candidate frequency domain basis vector set is further reduced. Then, it is only necessary to indicate which frequency-domain basis vectors in the union of the frequency-domain basis vectors are the frequency-domain basis vectors corresponding to each spatial layer, thereby reducing the indication overhead.

Description

A communication method and device

This application claims the priority of the Chinese patent application filed with the Intellectual Property Office of the People's Republic of China on April 9, 2019, the application number is 201910282453.0, and the invention name is "a communication method and device", the entire contents of which are incorporated herein by reference Applying.

technical field

The present application relates to the field of mobile communication technologies, and in particular, to a communication method and device.

Background technique

The Multiple Input and Multiple Output (Multiple Input and Multiple Output, MIMO) technology is the core technology of the Long Term Evolution (Long Term Evolution, LTE) system and the fifth generation (5th generation, 5G) new radio (new radio, NR).

Based on all or part of downlink channel state information (Channel State Information, CSI), precoding (Precoding) technology can effectively improve signal transmission performance and system capacity. For a frequency division duplexing (Frequency Division Duplexing, FDD) system, the uplink and downlink use different frequency bands, and the uplink channel cannot be used to obtain the downlink precoding matrix. In an existing wireless communication system, a precoding matrix or a precoding matrix index (Precoding Matrix Index, PMI) is generally fed back by a terminal device to obtain an optimal downlink precoding matrix.

其中， V₁至

是与N_f个频域单元对应的N_f个预编码向量，N1和N2分别为水平和垂直方向天线端口 数量。PMI频域单元所占的频域长度可以是频域子带的带宽，也可以是频域子带带宽的f倍， 如f＝1/2、f＝1/4，还可以是1/2/4个RB。我们可以进一步将Nf个频域单元对应的联合预编码 矩阵V转换为：Using the correlation of frequency-domain channels, the space-frequency compression codebook is formed by linearly combining selected multiple orthogonal spatial-domain beam basis vectors (beams) and multiple frequency-domain basis vectors (FD basis). Taking rank=1 and two polarization directions as an example, we can combine the precoding matrices corresponding to N _f frequency domain units into a matrix of 2N1N2*N _f

where V ₁ to

are the N _f precoding vectors corresponding to the N _f frequency domain units, and N1 and N2 are the number of antenna ports in the horizontal and vertical directions, respectively. The frequency domain length occupied by the PMI frequency domain unit may be the bandwidth of the frequency domain subband, or f times the bandwidth of the frequency domain subband, such as f=1/2, f=1/4, or 1/2 /4 RBs. We can further transform the joint precoding matrix V corresponding to the Nf frequency domain units as:

W ₁ is the matrix formed by the selected spatial beam basis vectors (dimension 2N1N2*2L), and the dual polarization direction contains a total of 2L spatial beam basis vectors (column vectors in W ₁ ):

(i＝0,1,…,L-1)为旋转DFT基矩阵(维度N₁N₂*N₁N₂)中选择 的第i个基向量，相应的，I_S(i)表示选择的基向量对应的索引。旋转2D-DFT基矩阵可以表示 为：Among them, N ₁ and N ₂ represent the number of antenna ports in the horizontal and vertical directions, respectively, and L is the number of spatial beam basis vectors selected for each spatial layer configured by the base station. In an implementation manner, the same spatial beam basis vector is selected for the two polarization directions, wherein the selected spatial beam basis vector

_{( i = 0} , ₁ , . The index corresponding to the basis vector. The rotated 2D-DFT basis matrix can be expressed as:

表示N×N的旋转矩阵。假设旋转因子q为均匀分布，那么

相应的，旋转矩阵与DFT正交矩阵的乘积构成的矩阵满足

Among them, D _N is an N×N orthogonal DFT matrix, and the element of the mth row and the nth column is

Represents an N×N rotation matrix. Assuming that the twiddle factor q is uniformly distributed, then

Correspondingly, the matrix formed by the product of the rotation matrix and the DFT orthogonal matrix satisfies

其中p的取值可以为{1/2,1/4}。若一个空间层上每个空域向量对应相同的M个频域基向量， 则

的维度为M×N_f，W₃中的每一个列向量对应一个频域基向量，此时每个空域向量对应的 频域基向量均为W₃中的M个频域基向量。W ₃ is a frequency-domain basis vector matrix formed by one or more selected frequency-domain basis vectors. The selected frequency domain basis vectors may be selected from predefined DFT basis matrices or rotated DFT basis matrices (dimensions N _f *N _f ). The network device configures the number M of frequency domain basis vectors contained in W ₃ corresponding to each spatial layer, where the value of M is related to the number N _f of frequency domain units,

The value of p can be {1/2,1/4}. If each spatial domain vector on a spatial layer corresponds to the same M frequency domain basis vectors, then

The dimension of is M×N _f , each column vector in W ₃ corresponds to a frequency-domain basis vector, and the frequency-domain basis vectors corresponding to each air-domain vector are all M frequency-domain basis vectors in W ₃ .

为空频合并系数矩阵，维度为2L×M。空频合并系数矩阵

中的第i行对应2L个空域 基向量中的第i个空域基向量，空频合并系数矩阵

中的第j列对应M个频域基向量中的第j 个频域基向量。第i个空域基向量对应的空频合并系数为空频合并系数矩阵

中的第i个行 向量，第i个空域基向量对应的空频合并系数为空频合并系数矩阵

中的第i个行向量中包 含的元素。

is the space-frequency combining coefficient matrix, and the dimension is 2L×M. Space-Frequency Combining Coefficient Matrix

The i-th row in corresponds to the i-th space-space basis vector in the 2L space-space basis vectors, and the space-frequency combining coefficient matrix

The j-th column in corresponds to the j-th frequency-domain basis vector among the M frequency-domain basis vectors. The space-frequency combining coefficient corresponding to the ith space-domain basis vector is the space-frequency combining coefficient matrix

The ith row vector in , the space-frequency combining coefficient corresponding to the ith space-domain basis vector is the space-frequency combining coefficient matrix

The elements contained in the ith row vector in .

其中

为第i个空域基向量对应的M_i个频域基向量构成 的M_i行N_f列的矩阵。

其中

是第i个空域基向量对应的维度 是1*M_i的空频合并系数矩阵，

中包含的空频合并系数为第i个空域向量对应的空频合 并系数。此时，

共计包含

个合并系数。若每个空域基向量 对应的频域基向量的数量均为M，则

共计包含2LM个合并系数。In addition, each of the L spatial basis vectors may also correspond to a different frequency domain basis vector. at this time,

in

is a matrix of M _i rows and N _f columns formed by M _i frequency domain base vectors corresponding to the ith space domain base vector.

in

is the space-frequency combining coefficient matrix whose dimension is 1*M _i corresponding to the ith space domain basis vector,

The space-frequency combining coefficients contained in are the space-frequency combining coefficients corresponding to the ith space vector. at this time,

Total contains

a combination factor. If the number of frequency domain basis vectors corresponding to each spatial domain basis vector is M, then

A total of 2LM merge coefficients are included.

此时W₃中的每一个行向量对应选择的一 个频域基向量。In addition, the space-frequency matrix V can also be expressed as

At this time, each row vector in W ₃ corresponds to a selected frequency domain base vector.

中实际上报的合并系数的最大数 量K₀(K₀<＝2LM)。其中K₀的取值与空域基向量数量L以及频域基向量数量M相关，

其中β的取值可以为{3/4,1/2,1/4，1/8}。例如，若每个空域基向量对应相同数量M个频域 基向量，经过空频压缩后，终端设备至多只能上报2L*M个合并系数中K₀个元素子集。此外， 终端设备可以进一步仅上报K₀个合并系数子集中对应的K₁个幅度非0的合并系数以及该K₁个 元素的索引(K₁<＝K₀)。可以理解为，K₀个合并系数为2LM个合并系数的子集，实际上报的K₁个合并系数是K₀个合并系数中的子集。K₁个元素的索引可以通过位图(bitmap)的方式指示(比特位图包括2LM个比特)。In order to control the reporting overhead, the network device configures the corresponding

The maximum number of actually reported merging coefficients K ₀ in (K ₀ <= 2LM). The value of K ₀ is related to the number L of space domain basis vectors and the number M of frequency domain basis vectors,

The value of β can be {3/4, 1/2, 1/4, 1/8}. For example, if each space-domain basis vector corresponds to the same number of M frequency-domain basis vectors, after space-frequency compression, the terminal device can only report at most K ₀ element subsets in the 2L*M combining coefficients. In addition, the terminal device may further report only the corresponding K ₁ combining coefficients in the K ₀ combining coefficient subsets with non-zero amplitudes and the indices of the K ₁ elements (K ₁ <=K ₀ ). It can be understood that the K ₀ merging coefficients are a subset of the 2LM merging coefficients, and the actually reported K ₁ merging coefficients are a subset of the K ₀ merging coefficients. The indices of the K ₁ elements can be indicated by a bitmap (the bitmap includes 2LM bits).

To sum up, for the space-frequency compression codebook, the terminal device needs to report the following information to the network device:

1) The index of the L space domain basis vectors contained in the W1 matrix;

2) the indices of the M frequency domain basis vectors contained in the W3 matrix corresponding to each spatial layer;

3) the position indication information (2LM bitmap) of the space-frequency combining coefficient corresponding to each spatial layer;

4) The amplitude of the K1 space-frequency combining coefficients reported corresponding to each spatial layer;

5) Each spatial layer corresponds to the reported phase of the K1 space-frequency combining coefficients.

It can be seen that, for the space-frequency compression codebook, its PMI overhead is related to various parameters, and the selected frequency-domain basis vector is important information for constructing the frequency _- domain basis matrix W3. In addition, the current codebook design reserves a large degree of reporting flexibility for the terminal device. Therefore, the actual CSI reporting overhead has a large dynamic range.

To this end, the current protocol adopts a two-level CSI reporting structure. The CSI report is divided into CSI part 1 (CSI part 1) and CSI part 2 (CSI part 2). The CSI part 1 is sent before the CSI part 2, and has a fixed payload size (size), which is used to determine the length of the information bits included in the CSI part 2. Based on the existing design solution for the space-frequency compression codebook, CSI part 1 and CSI part 2 respectively include the following indication information:

1) CSI part 1 is a fixed bit overhead length, which includes Rank Indication (RI), Channel Quality Indication (CQI) and the total number of reported space-frequency combining coefficients corresponding to all spatial layers, as shown in Table 1. Among them, RI is used to indicate the number R of spatial layers.

Table 1: CSI report (CSI part 1)

2) CSI Part 2 contains the following indications:

The index of the spatial basis vector corresponding to each spatial layer group is used to indicate the Li spatial basis vectors used by the _ith spatial layer group, wherein the spatial layers included in each spatial layer group adopt the same spatial basis vector.

• Indication of the spatial oversampling factor corresponding to each spatial layer group, wherein the spatial layers contained in each spatial layer group adopt the same spatial oversampling factor.

· The index indication of the frequency-domain basis vectors of each spatial layer, which is used to indicate the M _i frequency-domain basis vectors used by the ith spatial layer, wherein each spatial layer may adopt different frequency-domain basis vectors.

· Each spatial layer reports the position indication of the combined coefficient (bitmap with a length of 2*L*M bits).

• An index indication of the merging coefficient with the largest magnitude value for each spatial layer.

中 的一个取值。• An indication of the quantization reference amplitude value for each spatial layer. instruct

one of the values.

中的一个取值。• Difference magnitude values of the merging coefficients corresponding to each spatial layer. instruct

one of the values.

• The phase values of the merging coefficients corresponding to each spatial layer.

It can be seen that the index of the frequency domain basis vector corresponding to each spatial layer is indicated in CSI part 2. The frequency-domain basis vectors corresponding to each spatial layer are selected from a predefined set of N _f candidate frequency-domain basis vectors.

For the space-frequency compression codebook, there is currently no relevant protocol to define an indication method of the frequency-domain basis vector index. According to the latest progress of the current protocol, each spatial layer independently selects the corresponding frequency domain basis vector, so the frequency domain basis vector index selected by each spatial layer is not exactly the same. Furthermore, the number M of frequency domain basis vectors is related to the number of frequency domain subbands. For a large bandwidth system, the number of frequency domain subbands is large, and the corresponding value range of M is also large, and the maximum value of M can reach 20.

Generally speaking, the index used to indicate the corresponding frequency domain basis vector of each spatial layer can adopt the following two methods:

Method 1: Use bitmap indication.

In CSI part 2, for R spatial layers, the i-th spatial layer (i ranges from 1 to R) uses a bitmap of length N _f to indicate M _i frequency-domain basis vectors selected from the candidate frequency-domain basis vector set vector, where the jth bit of the bitmap takes a value of 1, indicating that the jth frequency domain basis vector is selected, and j takes a value from 1 to N _f .

Method 2: Combination number mode indication.

比 特的字段指示从N_f个候选频域基向量集合中选择的M_i个频域基向量的索引，

表示从N_f个 中频域基向量取出M_i个频域基向量的取法的数量。In CSI part 2, for R spatial layers, the i-th spatial layer (i is 1 to R) uses a length of

The field of bits indicates the index of the M _i frequency-domain basis vectors selected from the set of N _f candidate frequency-domain basis vectors,

Indicates the number of ways to extract M _i frequency domain basis vectors from N _f intermediate frequency domain basis vectors.

For the above method 1, it is necessary to use a bitmap to indicate the number of frequency domain basis vectors corresponding to each spatial layer, so the length of the bitmap is R*N _f , and the maximum value of N _f can reach 38, which will waste a large amount of indication overhead. .

For the above method 2, although the number of combinations can reduce the indication overhead compared to the method 1, the indication overhead is still relatively large, and there is a certain indication overhead redundancy.

To sum up, for the current space-frequency compression codebook, a large indication overhead is required to indicate the index of the frequency-domain basis vector corresponding to each selected spatial layer.

SUMMARY OF THE INVENTION

The present application provides a communication method and apparatus to reduce the indication overhead of indicating the index of the frequency domain basis vector corresponding to each selected spatial layer.

In a first aspect, the present application provides a communication method, the method includes: a terminal device determines frequency domain basis vectors corresponding to R spatial layers respectively, where R is an integer greater than 1; the terminal device sends channel state information CSI to a network device , the CSI includes first indication information, second indication information and third indication information; wherein, the first indication information is used to indicate the size of the union formed by the frequency domain basis vectors corresponding to the R spatial layers respectively , the second indication information is used to indicate the index of each frequency-domain basis vector in the union set in the candidate frequency-domain basis vector set, and the third indication information is used to indicate that the R spatial layers correspond to Indices of some or all of the frequency domain basis vectors in the union. This scheme effectively utilizes the overlapping feature of frequency domain basis vectors corresponding to multiple spatial layers, and introduces a new indication field in CSI. Specifically, by first reporting the union of the frequency-domain basis vectors corresponding to all spatial layers, the unselected vectors in the candidate frequency-domain basis vector set are excluded, and the size of the indicated candidate frequency-domain basis vector set is further reduced. Then, it is only necessary to indicate which frequency domain basis vectors in the union of the frequency domain basis vectors corresponding to each spatial layer are in the frequency domain basis vectors, thereby reducing the indication overhead.

In a second aspect, the present application provides a communication method, the method comprising: a network device receiving channel state information CSI from a terminal device, where the CSI includes first indication information, second indication information and third indication information; The first indication information is used to indicate the size of the union formed by the frequency domain basis vectors corresponding to the R spatial layers respectively, and the second indication information is used to indicate that each frequency domain basis vector in the union is in the candidate an index in the frequency domain basis vector set, the third indication information is used to indicate the index of some or all of the frequency domain basis vectors corresponding to the R spatial layers respectively in the union, and R is an integer greater than 1; The network device determines a precoding matrix according to the CSI. This scheme effectively utilizes the feature of overlapping frequency domain basis vectors corresponding to multiple spatial layers, and introduces a new indication field in CSI. Specifically, by first reporting the union of the frequency-domain basis vectors corresponding to all spatial layers, the vectors that are not selected in the candidate frequency-domain basis vector set are excluded, and the size of the indicated candidate frequency-domain basis vector set is further reduced. Subsequently, it is only necessary to indicate which frequency domain basis vectors in the union of the frequency domain basis vectors corresponding to each spatial layer are in the frequency domain basis vectors, thereby reducing the indication overhead.

Based on the first or second aspect above:

In a possible implementation method, the CSI includes CSI part 1 and CSI part 2, the CSI part 1 includes the first indication information, and the CSI part 2 includes the second indication information and the first indication information. Three instructions.

其中，R₀为支持的最大空间层数，R小于或等于R₀，N_f为所述候选频域基向量集合的大小， M_i为第i个空间层对应的频域基向量的数量，i取值为1至R₀，

表示向上取整。In a possible implementation method, the number of bits occupied by the first indication information is

Among them, R ₀ is the maximum number of spatial layers supported, R is less than or equal to R ₀ , N _f is the size of the candidate frequency-domain basis vector set, M _i is the number of frequency-domain basis vectors corresponding to the ith spatial layer, i takes values from 1 to R ₀ ,

Indicates rounded up.

其中，R₀为支持的最大空间层数，R小于或等于R₀，N_f为所述候选频域基向量集合 的大小，M_i为第i个空间层对应的频域基向量的数量，i取值为1至R₀，

表示向上取整， 所述第一指示信息的取值范围为从M₁到

所述M₁为第1个空间层对应的频域 基向量的数量。In yet another possible implementation method, the number of bits occupied by the first indication information is

Wherein, R ₀ is the maximum number of spatial layers supported, R is less than or equal to R ₀ , N _f is the size of the candidate frequency-domain basis vector set, M _i is the number of frequency-domain basis vectors corresponding to the ith spatial layer, i takes values from 1 to R ₀ ,

Indicates rounding up, and the value range of the first indication information is from M ₁ to

The M ₁ is the number of frequency domain basis vectors corresponding to the first spatial layer.

In a possible implementation method, there is a corresponding relationship between the value of the first indication information and the size of the union. For example, the size of the union is equal to the sum of the value of the first indication information and M ₁ , and the minimum value of the value of the first indication information is 0; or, the value of the first indication information is the same as the value of the first indication information. The correspondence between the sizes of the unions is predefined.

其中，X为所 述并集的大小，X为正整数，

表示向上取整，

表示从N_f个频域基向量中取出X个频域 基向量的取法的数量，N_f为所述候选频域基向量集合的大小。In a possible implementation method, the number of bits occupied by the second indication information is

where X is the size of the union, X is a positive integer,

means round up,

Indicates the number of ways to extract X frequency-domain basis vectors from N _f frequency-domain basis vectors, where N _f is the size of the candidate frequency-domain basis vector set.

In a possible implementation method, the second indication information is a bitmap, and the number of bits occupied by the bitmap is N _f , where N _f is the size of the candidate frequency-domain basis vector set.

其中，X为所述并集的大小，X为正整数，

表示向上取整,M_i为第i个空间层对应的频域基向量的数量，i取值为1至R，

表示从X个 频域基向量中取出M_i个频域基向量的取法的数量。In a possible implementation method, the third indication information includes R field information, and the ith field information in the R field information is used to indicate that the frequency domain basis vector corresponding to the ith spatial layer is in the The index in the union, the number of bits occupied by the i-th field information is

where X is the size of the union, X is a positive integer,

Represents rounded up, M _i is the number of frequency domain basis vectors corresponding to the i-th spatial layer, i takes values from 1 to R,

Indicates the number of ways to extract M _i frequency-domain basis vectors from X frequency-domain basis vectors.

In a possible implementation method, the third indication information includes R bitmaps, where one bitmap is used to indicate an index in the union of a frequency domain basis vector corresponding to one spatial layer, and the R The number of bits occupied by the bitmap is X, where X is the size of the union, and X is a positive integer.

所述第二字段信息占用的比特数等于

X为所述并集的大小，X为正整数，

表示向上取整,M_i为第i个空间层对 应的频域基向量的数量，i取值为1至2，

表示从X个频域基向量中取出M₁个频域基向量 的取法的数量，

表示从M₁个频域基向量中取出M₁+M₂-X个频域基向量的取法的 数量。In a possible implementation method, R=2, the third indication information includes first field information and second field information, and the first field information is used to indicate the frequency domain basis vector corresponding to the first spatial layer The index in the union, the second field information is used to indicate the frequency domain basis vector in the intersection of the frequency domain basis vector corresponding to the first spatial layer and the frequency domain basis vector corresponding to the second spatial layer The index in the frequency domain base vector corresponding to the first spatial layer; wherein, the number of bits occupied by the first field information is equal to

The number of bits occupied by the second field information is equal to

X is the size of the union, X is a positive integer,

Represents rounded up, M _i is the number of frequency domain basis vectors corresponding to the ith spatial layer, i is 1 to 2,

Indicates the number of ways to extract M ₁ frequency domain basis vectors from X frequency domain basis vectors,

Indicates the number of ways to extract M ₁ +M ₂ -X frequency-domain basis vectors from M ₁ frequency-domain basis vectors.

In a possible implementation method, R=2, the third indication information includes first field information and second field information, the first field information is a first bitmap, and the first bitmap used to indicate the index of the frequency domain basis vector corresponding to the first spatial layer in the union, the second field information is a second bitmap, and the second bitmap is used to indicate the first The index of the frequency domain basis vector in the intersection of the frequency domain basis vector corresponding to the spatial layer and the frequency domain basis vector corresponding to the second spatial layer in the frequency domain basis vector corresponding to the first spatial layer; wherein, the The number of bits occupied by the first bitmap is X, X is the size of the union, X is a positive integer, and the number of bits occupied by the second bitmap is the frequency domain base corresponding to the first spatial layer the number of vectors.

In a possible implementation method, the frequency domain basis vector corresponding to the second spatial layer includes the frequency domain basis vector indicated by the second field information and the frequency domain basis vector indicated by the first field information removed from the union. Frequency domain basis vectors other than domain basis vectors.

In a third aspect, the present application provides a communication method. The method includes: a terminal device determines frequency domain base vectors corresponding to R spatial layers respectively, where R is an integer greater than 1; the terminal device sends channel state information CSI to a network device , the CSI includes first indication information, second indication information and third indication information; wherein, the first indication information is used to indicate the size of the intersection formed by the frequency domain basis vectors corresponding to the R spatial layers respectively, The second indication information is used to indicate the index of each frequency-domain basis vector in the intersection set in the candidate frequency-domain basis vector set, and the third indication information is used to indicate the parts corresponding to the R spatial layers respectively or an index of the frequency domain basis vectors other than the intersection among all the frequency domain base vectors in the set formed by the candidate frequency domain base vectors except the intersection set. This scheme effectively utilizes the feature of overlapping frequency domain basis vectors corresponding to multiple spatial layers, and introduces a new indication field in the CSI. Specifically, by first reporting the intersection of frequency-domain basis vectors corresponding to all spatial layers, then it is only necessary to indicate the frequency-domain basis vectors corresponding to each spatial layer except the frequency-domain basis vectors included in the frequency-domain basis vector intersection. Therefore, the frequency domain basis vectors corresponding to different spatial layers have certain overlapping characteristics, and the indication overhead is reduced.

In a fourth aspect, the present application provides a communication method, the method comprising: a network device receiving channel state information CSI from a terminal device, where the CSI includes first indication information, second indication information and third indication information; wherein, the The first indication information is used to indicate the size of the intersection formed by the frequency domain basis vectors corresponding to the R spatial layers respectively, and the second indication information is used to indicate that each frequency domain basis vector in the intersection set is in the candidate frequency domain. The index in the domain basis vector set, and the third indication information is used to indicate that the frequency domain basis vectors other than the intersection among some or all of the frequency domain basis vectors corresponding to the R spatial layers respectively are in the candidate The index of the frequency domain basis vector set in the set formed by the frequency domain basis vectors other than the intersection set; the network device determines the precoding matrix according to the CSI. This scheme effectively utilizes the feature of overlapping frequency domain basis vectors corresponding to multiple spatial layers, and introduces a brand-new indication field in the CSI. Specifically, by first reporting the intersection of frequency-domain basis vectors corresponding to all spatial layers, then it is only necessary to indicate the frequency-domain basis vectors corresponding to each spatial layer except the frequency-domain basis vectors included in the frequency-domain basis vector intersection. Therefore, the frequency domain basis vectors corresponding to different spatial layers have certain overlapping characteristics, and the indication overhead is reduced.

Based on the third or fourth aspect above:

In a possible implementation method, the CSI includes CSI part 1 and CSI part 2, the CSI part 1 includes the first indication information, and the CSI part 2 includes the second indication information and the first indication information. Three instructions.

其 中，M_i为第i个空间层对应的频域基向量的数量，i取值为1至R₀，

表示向上取整，R₀为 支持的最大空间层数。In a possible implementation method, the number of bits occupied by the first indication information is

Among them, M _i is the number of frequency domain basis vectors corresponding to the ith spatial layer, and i ranges from 1 to R ₀ ,

Indicates rounded up, and R ₀ is the maximum number of spatial layers supported.

其中，Y为所 述交集的大小Y为正整数，

表示向上取整，

表示从N_f个频域基向量中取出Y个频域基 向量的取法的数量，N_f为所述候选基向量集合的大小。In a possible implementation method, the number of bits occupied by the second indication information is

where Y is the size of the intersection and Y is a positive integer,

means round up,

Indicates the number of ways to extract Y frequency domain basis vectors from N _f frequency domain basis vectors, where N _f is the size of the candidate basis vector set.

In a possible implementation method, the second indication information is a bitmap, and the number of bits occupied by the bitmap is N _f , where N _f is the size of the candidate frequency-domain basis vector set.

其中，Y为所述交集的大小，Y为正整数，

表示向上取整,M_i为第i个空间层对应的频域基向量的数量，i取值为1至R，

表示从N_f-Y个频域基向量中取出M_i-Y个频域基向量的取法的数量，N_f为所述候选频域基向量 集合的大小。In a possible implementation method, the third indication information includes R field information, and the ith field information in the R field information is used to indicate the frequency domain basis vector corresponding to the ith spatial layer. The index of the frequency domain basis vectors other than the intersection set in the set formed by the frequency domain basis vectors other than the intersection set from the candidate frequency domain base vector set, and the number of bits occupied by the i-th field information is:

where Y is the size of the intersection, Y is a positive integer,

Represents rounded up, M _i is the number of frequency domain basis vectors corresponding to the i-th spatial layer, i takes values from 1 to R,

Indicates the number of ways to extract M _i -Y frequency domain basis vectors from N _f -Y frequency domain basis vectors, where N _f is the size of the candidate frequency domain basis vector set.

In a possible implementation method, the third indication information includes R bitmaps, and one bitmap is used to indicate the frequency domain basis except the intersection set in the frequency domain basis vector corresponding to one spatial layer The index of the vector in the candidate frequency domain base vector set, the number of bits occupied by the R bitmaps are all N _f -Y, where N _f is the size of the candidate frequency domain base vector set, and Y is the The size of the intersection.

所述 第二字段信息占用的比特数等于

Y为所述交集的大小，Y为正整数，

表示向 上取整,M_i为第i个空间层对应的频域基向量的数量，i取值为1至2，

表示从N_f-Y个 频域基向量中取出M₁-Y个频域基向量的取法的数量，

表示从N_f-M₁个频域基向量 中取出M₂-Y个频域基向量的取法的数量，N_f为所述候选频域基向量集合的大小。In a possible implementation method, R=2, the third indication information includes first field information and second field information, and the first field information is used to indicate the frequency domain basis vector corresponding to the first spatial layer The index of the frequency-domain basis vectors other than the intersection in the candidate frequency-domain basis vector set in the set formed by the frequency-domain basis vectors except the intersection, and the second field information is used to indicate In the frequency-domain basis vectors corresponding to the second spatial layer, the frequency-domain basis vectors other than the intersection are excluded from the frequency-domain basis vectors corresponding to the first spatial layer in the candidate frequency-domain basis vector set The index in the set formed by the frequency domain basis vectors of ; wherein, the number of bits occupied by the first field information is equal to

The number of bits occupied by the second field information is equal to

Y is the size of the intersection, Y is a positive integer,

Represents rounded up, M _i is the number of frequency domain basis vectors corresponding to the ith spatial layer, i is 1 to 2,

represents the number of ways to extract M ₁ -Y frequency domain basis vectors from N _f -Y frequency domain basis vectors,

Indicates the number of ways to extract M ₂ -Y frequency domain basis vectors from N _f -M ₁ frequency domain basis vectors, where N _f is the size of the candidate frequency domain basis vector set.

In a possible implementation method, R=2, the third indication information includes first field information and second field information, the first field information is a first bitmap, and the first field information uses A set consisting of frequency domain basis vectors other than the intersection set in the frequency domain base vectors indicating the first spatial layer corresponding to the frequency domain base vectors except the intersection set in the candidate frequency domain base vector set The second field information is used to indicate that the frequency domain basis vectors other than the intersection set in the frequency domain basis vectors corresponding to the second spatial layer are excluded from the candidate frequency domain basis vector set. The index in the set formed by the frequency domain basis vectors other than the frequency domain basis vectors corresponding to the first spatial layer; wherein, the number of bits occupied by the first bitmap is equal to N _f −Y, and the second bit Figure N _f minus the number of frequency domain basis vectors corresponding to the first spatial layer, Y is the size of the intersection, Y is a positive integer, and N _f is the size of the candidate frequency domain basis vector set.

In a possible implementation method, the frequency domain basis vector corresponding to the first spatial layer includes the frequency domain basis vector indicated by the first field information and the frequency domain basis vector in the intersection set, and the second The frequency-domain basis vectors corresponding to the spatial layers include the frequency-domain basis vectors indicated by the second field information and the frequency-domain basis vectors in the intersection set.

In a fifth aspect, the present application provides a communication method. The method includes: a terminal device determines frequency domain basis vectors corresponding to R spatial layers respectively, where R is an integer greater than or equal to 1; the terminal device sends a channel status to a network device Information CSI, the CSI includes first indication information, second indication information and third indication information; wherein, the first indication information is used to indicate the size of the first set, and the first set includes candidate frequency domain basis vectors The index in the set circulates consecutive N ₃ frequency-domain basis vectors, the N ₃ frequency-domain basis vectors include a union formed by the frequency-domain basis vectors corresponding to the R spatial layers respectively, and the index circulates consecutive N _The first frequency domain basis vector and the last frequency domain basis vector in the three frequency domain basis vectors are both the frequency domain basis vectors in the union; the second indication information is used to indicate the The index of the first frequency-domain basis vector in the candidate frequency-domain basis vector set; the third indication information is used to indicate that some or all of the frequency-domain basis vectors corresponding to the R spatial layers are in the The index in the first collection. This scheme effectively utilizes the overlapping feature of frequency domain basis vectors corresponding to multiple spatial layers, and introduces a new indication field in CSI. Specifically, by first reporting the first set of frequency-domain basis vectors corresponding to all spatial layers, some unselected vectors in the candidate frequency-domain basis vector set are excluded, and the size of the indicated candidate frequency-domain basis vector set is further reduced. Subsequently, it is only necessary to indicate which frequency domain basis vectors in the first set of frequency domain basis vectors corresponding to each spatial layer are in the frequency domain basis vectors, thereby reducing the indication overhead.

In a sixth aspect, the present application provides a communication method, the method comprising: a network device receiving channel state information CSI from a terminal device, where the CSI includes first indication information, second indication information and third indication information; wherein, the The first indication information is used to indicate the size of the first set, where the first set includes N ₃ frequency-domain basis vectors with consecutive indices in the candidate frequency-domain basis vector set, and the N ₃ frequency-domain basis vectors include The union formed by the frequency domain basis vectors corresponding to the R spatial layers respectively, the first frequency domain basis vector and the last frequency domain basis vector in the N ₃ frequency domain basis vectors that are consecutive in the index cycle are both the union frequency domain basis vectors in the set; the second indication information is used to indicate the index of the first frequency domain basis vectors in the first set in the candidate frequency domain basis vector set; the third indication The information is used to indicate the indices in the first set of some or all of the frequency-domain basis vectors corresponding to the R spatial layers, where R is an integer greater than or equal to 1; the network device determines, according to the CSI, the encoding matrix. This scheme effectively utilizes the overlapping feature of frequency domain basis vectors corresponding to multiple spatial layers, and introduces a new indication field in CSI. Specifically, by first reporting the first set of frequency-domain basis vectors corresponding to all spatial layers, some unselected vectors in the candidate frequency-domain basis vector set are excluded, and the size of the indicated candidate frequency-domain basis vector set is further reduced. Subsequently, it is only necessary to indicate which frequency domain basis vectors in the first set of frequency domain basis vectors corresponding to each spatial layer are in the frequency domain basis vectors, thereby reducing the indication overhead.

Based on the fifth or sixth aspect above:

In a possible implementation method, the CSI includes CSI part 1 and CSI part 2, the CSI part 1 includes the first indication information, and the CSI part 2 includes the second indication information and the first indication information. Three instructions.

其中， N_f为所述候选频域基向量集合的大小，所述M₁为第1个空间层对应的频域基向量的数量，

表示向上取整，所述第一指示信息的取值范围为从M₁到N_f。In a possible implementation method, the number of bits occupied by the first indication information is

Wherein, N _f is the size of the candidate frequency domain basis vector set, and the M ₁ is the number of frequency domain basis vectors corresponding to the first spatial layer,

means rounding up, and the value range of the first indication information is from M ₁ to N _f .

In a possible implementation method, there is a corresponding relationship between the value of the first indication information and the size of the first set.

In a possible implementation method, the size of the first set is equal to the sum of the value of the first indication information and M ₁ , and the minimum value of the value of the first indication information is 0; The corresponding relationship between the value of the indication information and the size of the first set is predefined.

其中，

表示 向上取整，N_f为所述候选频域基向量集合的大小。In a possible implementation method, the number of bits occupied by the second indication information is

in,

represents rounding up, and N _f is the size of the candidate frequency domain basis vector set.

其中，

表示向上取整，M_i为第i个空间层对应的频域基向量的数量，i取值为1至R，

表示从N₃个频域基向量中取出M_i个频域 基向量的取法的数量。In a possible implementation method, the third indication information includes R field information, and the ith field information in the R field information is used to indicate that the frequency domain basis vector corresponding to the ith spatial layer is in the The index in the first set, the number of bits occupied by the i-th field information is

in,

Represents rounding up, M _i is the number of frequency domain basis vectors corresponding to the i-th spatial layer, i takes values from 1 to R,

Indicates the number of ways to extract M _i frequency domain basis vectors from N ₃ frequency domain basis vectors.

In a possible implementation method, the third indication information includes R bitmaps, and one bitmap is used to indicate an index in the first set of a frequency domain basis vector corresponding to one spatial layer, and the The number of bits occupied by the R bitmaps are all N ₃ .

In a possible implementation method, the index of the N ₃ frequency-domain basis vectors is mod(M _initial +n, N _f ), n=0, 1, ..., N ₃ -1, and M _initial represents the is the index of the first frequency-domain basis vector in the first set in the candidate frequency-domain basis vector set, and N _f is the size of the candidate frequency-domain basis vector set.

In a seventh aspect, the present application provides a communication apparatus, which may be a terminal device or a chip used for the terminal device. The device has the function of implementing the various embodiments of the first aspect described above. This function may be implemented by hardware, or by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the above functions.

In an eighth aspect, the present application provides a communication device, which may be a network device or a chip used for the network device. The device has the function of implementing the various embodiments of the second aspect described above. This function may be implemented by hardware, or by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the above functions.

In a ninth aspect, the present application provides a communication apparatus, which may be a terminal device or a chip used for the terminal device. The device has the function of implementing the various embodiments of the third aspect above. This function may be implemented by hardware, or by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the above functions.

In a tenth aspect, the present application provides a communication device, which may be a network device or a chip used for the network device. The device has the function of implementing the various embodiments of the fourth aspect described above. This function may be implemented by hardware, or by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the above functions.

In an eleventh aspect, the present application provides a communication apparatus, which may be a terminal device or a chip used for the terminal device. The device has the function of implementing the various embodiments of the fifth aspect above. This function may be implemented by hardware, or by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the above functions.

In a twelfth aspect, the present application provides a communication apparatus, which may be a network device or a chip used for the network device. The device has the function of implementing the embodiments of the sixth aspect above. This function may be implemented by hardware, or by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the above functions.

In a thirteenth aspect, the present application provides a communication device, comprising: a processor and a memory; the memory is used to store computer-executed instructions, and when the device is running, the processor executes the computer-executed instructions stored in the memory, so as to make The apparatus performs the method as described in the above aspects.

In a fourteenth aspect, the present application provides a communication device comprising: comprising means or means for performing various steps of the above aspects.

In a fifteenth aspect, the present application provides a communication device, comprising a processor and an interface circuit, the processor is configured to communicate with other devices through the interface circuit, and execute the methods described in the above aspects. The processor includes one or more.

In a sixteenth aspect, the present application provides a communication device, including a processor, which is connected to a memory and used to call a program stored in the memory to execute the methods described in the above aspects. The memory may be located within the device or external to the device. And the processor includes one or more.

In a seventeenth aspect, the present application further provides a computer-readable storage medium, where instructions are stored in the computer-readable storage medium, when the computer-readable storage medium runs on a computer, it causes a processor to execute the methods described in the above aspects.

In an eighteenth aspect, the present application also provides a computer program product comprising instructions, which, when run on a computer, cause the computer to perform the methods described in the above aspects.

In a nineteenth aspect, the present application further provides a chip system, including: a processor for executing the methods described in the above aspects.

In a twentieth aspect, the present application further provides a communication system, comprising: a terminal device for executing any of the methods described in the first aspect above and a network device for executing any of the methods described in the second aspect above.

In a twenty-first aspect, the present application further provides a communication system, comprising: a terminal device for executing any of the methods described in the third aspect and a network device for executing any of the methods described in the fourth aspect.

In a twenty-second aspect, the present application further provides a communication system, including: a terminal device for executing any of the methods described in the fifth aspect and a network device for executing any of the methods described in the sixth aspect.

Description of drawings

1 is a schematic diagram of a possible network architecture provided by this application;

FIG. 2A is an example diagram of index reporting of frequency domain basis vectors provided by this application;

FIG. 2B is another example diagram of index reporting of frequency-domain basis vectors provided by the application;

Fig. 3 is another example diagram of the index reporting of the frequency domain basis vector provided by the present application;

4 is a schematic diagram of a communication method provided by the present application;

5 is a schematic diagram of a communication device provided by the present application;

6 is a schematic diagram of another communication device provided by the present application;

FIG. 7 is a schematic diagram of another communication device provided by the present application.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be described in further detail below with reference to the accompanying drawings. The specific operation methods in the method embodiments may also be applied to the apparatus embodiments or the system embodiments. Wherein, in the description of the present application, unless otherwise specified, "plurality" means two or more.

As shown in Figure 1, it is a schematic diagram of a possible network architecture to which this application applies, including network equipment and at least one terminal equipment. The network device and the terminal device can work on a new radio (new radio, NR) communication system, and the terminal device can communicate with the network device through the NR communication system. The network device and the terminal device may also work on other communication systems, which are not limited in this embodiment of the present application.

The terminal device can be a wireless terminal device capable of receiving network device scheduling and indication information, a wireless terminal device can be a device that provides voice and/or data connectivity to the user, or a handheld device with wireless connectivity, or connected to a wireless modem other processing equipment. A wireless end device may communicate with one or more core networks or the Internet via a radio access network (eg, a radio access network, RAN), and the wireless end device may be a mobile end device such as a mobile phone (or "cellular" phone) , mobile phone (mobile phone), computer and data card, for example, may be portable, pocket, hand-held, computer built-in or vehicle mounted mobile devices that exchange language and/or data with the radio access network. For example, personal communication service (PCS) phones, cordless phones, Session Initiation Protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants (PDAs), tablets Computer (Pad), computer with wireless transceiver function and other equipment. A wireless terminal device may also be referred to as a system, a subscriber unit, a subscriber station, a mobile station (mobile station), a mobile station (MS), a remote station (remote station), an access point ( access point (AP), remote terminal (remote terminal), access terminal (access terminal), user terminal (user terminal), user agent (user agent), subscriber station (SS), user terminal equipment (customer premises equipment, CPE), terminal (terminal), user equipment (user equipment, UE), mobile terminal (mobile terminal, MT), etc. The wireless terminal device can also be a wearable device and a next-generation communication system, for example, a terminal device in a 5G network or a terminal device in a future evolved public land mobile network (PLMN) network, and a terminal device in an NR communication system. terminal equipment, etc.

A network device is an entity on the network side for transmitting or receiving signals, such as a new generation base station (generation Node B, gNodeB). A network device may be a device used to communicate with mobile devices. The network device may be an AP in wireless local area networks (WLAN), a base transceiver station (base transceiver station) in global system for mobile communication (GSM) or code division multiple access (CDMA) BTS), or a base station (NodeB, NB) in wideband code division multiple access (WCDMA), or an evolved base station (evolutional Node) in long term evolution (long term evolution, LTE). B, eNB or eNodeB), or relay station or access point, or in-vehicle equipment, wearable equipment and network equipment in future 5G networks or network equipment in future evolved public land mobile network (PLMN) networks , or gNodeB in NR system, etc. In addition, in this embodiment of the present application, a network device provides services for a cell, and a terminal device communicates with the network device through transmission resources (for example, frequency domain resources, or spectrum resources) used by the cell, and the cell may be a network device (for example, a base station) corresponds to a cell. The cell may belong to a macro base station or a base station corresponding to a small cell. The small cell here may include: Metro cell, Microcell, Pico cell cell), femto cell (Femto cell), etc. These small cells have the characteristics of small coverage and low transmit power, and are suitable for providing high-speed data transmission services. In addition, in other possible cases, the network device may be other devices that provide wireless communication functions for the terminal device. The embodiments of the present application do not limit the specific technology and specific device form adopted by the network device. For convenience of description, in this embodiment of the present application, a device that provides a wireless communication function for a terminal device is referred to as a network device.

To facilitate understanding of the embodiments of the present application, the following briefly describes terms involved in the embodiments of the present application.

1. Precoding technology: The network device can process the signal to be sent with the help of a precoding matrix that matches the channel resources when the channel state is known, so that the precoded signal to be sent is adapted to the channel, thereby This reduces the complexity for the receiving device to eliminate the influence between channels. Therefore, the received signal quality (such as a signal to interference plus noise ratio (SINR), etc.) is improved through the precoding process of the signal to be transmitted. Therefore, by using the precoding technology, the transmitting device and multiple receiving devices can transmit on the same time-frequency resource, that is, multi-user multiple input multiple output (MU-MIMO) is realized. It should be noted that the relevant descriptions about the precoding technology are only examples for ease of understanding, and are not used to limit the protection scope of the embodiments of the present application. In the specific implementation process, the sending device may also perform precoding in other ways. For example, in the case where the channel information (such as but not limited to the channel matrix) cannot be known, a preset precoding matrix or weighting processing method is used to perform precoding, etc. For the sake of brevity, the specific content will not be repeated here.

2. Precoding Matrix Indication (PMI): can be used to indicate the precoding matrix. Wherein, the precoding matrix can be, for example, the terminal equipment based on each frequency domain unit (for example, the frequency domain length of a frequency domain unit can be a subband, or R times of a frequency domain subband, R<=1, the value of R It can be a precoding matrix determined by the channel matrix of 1 or 1/2, or RB). The channel matrix may be determined by the terminal device through channel estimation or the like or based on channel reciprocity. However, it should be understood that the specific method for determining the precoding matrix by the terminal device is not limited to the above, and the specific implementation can refer to the prior art, which is not listed here for brevity.

For example, the precoding matrix may be obtained by performing singular value decomposition (SVD) on the channel matrix or the covariance matrix of the channel matrix, or by performing eigenvalue decomposition (eigenvalue) on the covariance matrix of the channel matrix. decopomsition, EVD). It should be understood that the manner of determining the precoding matrix listed above is only an example, and should not constitute any limitation to the present application. For the determination method of the precoding matrix, reference may be made to the prior art, which is not listed here for brevity.

It should be noted that, in the method provided by the embodiment of the present application, the network device can determine the space-domain vector, the frequency-domain base vector, and the combination coefficient of the space-frequency vector pair for constructing the precoding vector based on the feedback of the terminal device, and then determine the combination coefficient with each frequency domain. The precoding matrix corresponding to the domain unit. The precoding matrix can be directly used for downlink data transmission; it can also be subjected to some beamforming methods, such as zero forcing (ZF), regularized zero-forcing (RZF), minimum mean square error (minimum square error) mean-squared error, MMSE), maximize signal-to-leakage-and-noise (signal-to-leakage-and-noise, SLNR), etc., to obtain a precoding matrix that is finally used for downlink data transmission. This application does not limit this. Unless otherwise specified, the precoding matrix involved in the following may all refer to the precoding matrix determined based on the method provided in this application.

It can be understood that the precoding matrix determined by the terminal device can be understood as the precoding matrix to be fed back. The terminal device can indicate the precoding matrix to be fed back through the PMI, so that the network device can restore the precoding matrix based on the PMI. It can be understood that the precoding matrix recovered by the network device based on the PMI may be the same as or similar to the precoding matrix to be fed back.

In downlink channel measurement, the higher the similarity between the precoding matrix determined by the network device according to the PMI and the precoding matrix determined by the terminal device, the better the precoding matrix determined by the network device for data transmission and the channel state. Therefore, the reception quality of the signal can be improved.

3. Precoding vector: A precoding matrix may include one or more vectors, such as column vectors. A precoding matrix can be used to determine one or more precoding vectors.

When the number of spatial layers is 1 and the number of polarization directions of the transmitting antenna is also 1, the precoding matrix is the precoding vector. When the number of spatial layers is multiple and the number of polarization directions of the transmit antenna is 1, the precoding vector may refer to the component of the precoding matrix on one spatial layer. When the number of spatial layers is 1 and the number of polarization directions of the transmit antenna is multiple, the precoding vector may refer to the component of the precoding matrix in one polarization direction. When the number of spatial layers is multiple and the number of polarization directions of the transmit antenna is also multiple, the precoding vector may refer to the component of the precoding matrix in one spatial layer and one polarization direction.

It should be understood that the precoding vector can also be determined by the vector in the precoding matrix, for example, obtained by performing mathematical transformation on the vector in the precoding matrix. This application does not limit the mathematical transformation relationship between the precoding matrix and the precoding vector.

4. Antenna port: can be referred to as port. It can be understood as the transmitting antenna recognized by the receiving device, or the transmitting antenna that can be distinguished in space. One antenna port can be pre-configured for each virtual antenna, each virtual antenna can be a weighted combination of multiple physical antennas, and each antenna port can correspond to a reference signal. Therefore, each antenna port can be called a reference signal. Ports, for example, CSI-RS ports, sounding reference signal (SRS) ports, and the like. In this embodiment of the present application, an antenna port may refer to a transceiver unit (transceiver unit, TxRU).

5. Spatial domain vector: or beam vector, spatial beam basis vector or spatial basis vector. Each element in the spatial vector can represent the weight of each antenna port. Based on the weight of each antenna port represented by each element in the space vector, the signals of each antenna port are linearly superimposed to form a region with stronger signals in a certain spatial direction.

The length of the space vector may be the number N _s of transmit antenna ports in one polarization direction, where N _s ≥ 1, and is an integer. The space domain vector can be, for example, a column vector or a row vector of length _Ns . This application does not limit this.

Optionally, the spatial vector is taken from a discrete Fourier transform (Discrete Fourier Transform, DFT) matrix. Each column vector in the DFT matrix may be referred to as a DFT vector. In other words, the space domain vector can be a DFT vector. The spatial vector may be, for example, a DFT vector defined in a type II (type II) codebook in the NR protocol TS 38.214 release 15 (release 15, R15).

6. Spatial vector set: it can include multiple spatial vectors of different lengths to correspond to different numbers of antenna ports. In the embodiment of the present application, the length of the airspace vector is N _s , so the length of each airspace vector in the airspace vector set to which the airspace vector reported by the terminal device belongs is N _s .

In a possible design, the spatial vector set may include N _s spatial vectors, and the N _s spatial vectors may be mutually orthogonal to each other. Each spatial vector in the set of spatial vectors may be taken from a two-dimensional (2 dimension, 2D)-DFT matrix. Among them, 2D can represent two different directions, such as horizontal direction and vertical direction. If the number of antenna ports in the horizontal direction and the vertical direction are N ₁ and N ₂ respectively, then N _s =N ₁ N ₂ .

该N_s个空域向量可以构建矩阵U_s，

若空域向量集合中的每个空域向量取自2D-DFT矩阵，则

其中D_N为N×N的正交DFT矩阵，第m行第n列的元素为

在另一种可能的设计中，该空域向量集合可以通过过采样因子O_s扩展为O_s×N_s个空域向量。此情况下，该空域向量集合可以包括O_s个子集，每个子集可以包括N_s个空域向量。每个子 集中的N_s个空域向量之间可以两两相互正交。该空域向量集合中的每个空域向量可以取自过采样2D-DFT矩阵。其中，过采样因子O_s为正整数。具体地，O_s＝O₁×O₂，O₁可以是水平方 向的过采样因子，O₂可以是垂直方向的过采样因子。O₁≥1，O₂≥1，O₁、O₂不同时为1，且均 为整数。The N _s space domain vectors can be written as, for example,

The N _s space domain vectors can construct the matrix U _s ,

If each spatial vector in the set of spatial vectors is taken from a 2D-DFT matrix, then

where D _N is an N×N orthogonal DFT matrix, and the elements of the m-th row and n-th column are

In another possible design, the set of spatial vectors can be expanded to O _s ×N _s spatial vectors by an oversampling factor O _s . In this case, the set of airspace vectors may include O _s subsets, and each subset may include N _s airspace vectors. The _Ns spatial vectors in each subset can be mutually orthogonal to each other pairwise. Each spatial vector in the set of spatial vectors may be taken from an oversampled 2D-DFT matrix. Among them, the oversampling factor O _s is a positive integer. Specifically, O _s =O ₁ ×O ₂ , O ₁ may be an oversampling factor in the horizontal direction, and O ₂ may be an oversampling factor in the vertical direction. O ₁ ≥1, O ₂ ≥ 1, O ₁ and O ₂ are not 1 at the same time, and both are integers.

则基于该第o_s个子集中的N_s个空域向量可以构造矩阵

The N _s airspace vectors in the o _s (0≤o _s ≤O _s -1 and o _s is an integer) subset in the airspace vector set can be respectively recorded as, for example,

Then a matrix can be constructed based on the N _s space domain vectors in the o _s subset

7. Frequency domain unit: a unit of frequency domain resources, which can represent different granularity of frequency domain resources. The frequency domain unit may include, for example, but not limited to, a subband (subband), a resource block (RB), a subcarrier, a resource block group (RBG), or a precoding resource block group (PRG) )Wait. In addition, the frequency domain length of a frequency domain unit may also be R times the CQI subband, R<=1, and the value of R may be 1 or 1/2, or the frequency domain length of a frequency domain unit may also be RB. .

In this embodiment of the present application, the precoding matrix corresponding to the frequency domain unit may refer to a precoding matrix determined by performing channel measurement and feedback based on the reference signal on the frequency domain unit. The precoding matrix corresponding to the frequency domain unit can be used to precode the subsequent data transmitted through the frequency domain unit. Hereinafter, the precoding matrix or precoding vector corresponding to the frequency domain unit may also be simply referred to as the precoding matrix or precoding vector of the frequency domain unit.

8. Frequency domain basis vector (frequency domain basis vector): also known as frequency domain vector, which can be used to represent the variation law of the channel in the frequency domain. Each frequency domain basis vector can represent a variation law. Since the signal is transmitted through the wireless channel, there are multiple paths from the transmitting antenna to the receiving antenna. Multipath delay leads to frequency selective fading, which is the variation of the frequency domain channel. Therefore, the variation law of the channel in the frequency domain caused by the delay on different transmission paths can be represented by different frequency domain base vectors.

The length of the frequency domain base vector can be determined by the number of frequency domain units to be reported preconfigured in the reporting bandwidth, or determined by the length of the reporting bandwidth, or can be a protocol predefined value. This application does not limit the length of the frequency domain base vector. The reporting bandwidth may, for example, refer to the CSI reporting bandwidth (csi-ReportingBand) carried in the CSI reporting preconfiguration through high-layer signaling (eg, a radio resource control (radioresource control, RRC) message).

The length of the frequency domain basis vector u _f can be denoted as N _f , where N _f is a positive integer. The frequency domain basis vector can be, for example, a column vector or a row vector of length N _f . This application does not limit this.

All spatial beam basis vectors corresponding to each spatial layer can use the same frequency domain basis vector, and the same frequency domain basis vector used by the spatial beam basis vectors corresponding to each spatial layer is called the frequency domain basis vector corresponding to the spatial layer.

9. Candidate frequency domain basis vector set: also known as frequency domain basis vector set, frequency domain vector set: may include frequency domain basis vectors of various lengths. In the embodiment of the present application, the length of the frequency domain base vector is N _f , so the length of each frequency domain base vector in the set of candidate frequency domain base vectors to which the frequency domain base vector reported by the terminal device belongs is N _f .

In a possible design, the set of candidate frequency-domain basis vectors may include N _f frequency-domain basis vectors. The N _f frequency domain basis vectors may be mutually orthogonal in pairs. Each frequency-domain basis vector in the set of candidate frequency-domain basis vectors may be taken from a DFT matrix or an IDFT matrix (ie, the conjugate transpose matrix of the DFT matrix).

该N_f个频域基向量可以构建矩 阵U_f，

The N _f frequency domain basis vectors can be written as, for example,

The N _f frequency domain basis vectors can construct a matrix U _f ,

In another possible design, the set of candidate frequency-domain basis vectors may be expanded into O _f ×N _f frequency-domain basis vectors by an oversampling factor of O _f . In this case, the set of candidate frequency domain basis vectors may include O _f subsets, and each subset may include N _f frequency domain basis vectors. The N _f frequency domain basis vectors in each subset may be mutually orthogonal in pairs. Each frequency-domain basis vector in the set of candidate frequency-domain basis vectors may be taken from an oversampled DFT matrix or a conjugate transpose matrix of an oversampled DFT matrix. Among them, the _oversampling factor Of is a positive integer.

则基于该第o_f个子集中的N_s个波束向量可以构造 矩阵

The N _f frequency domain basis vectors in the o _f (0≤o _f ≤O _f -1 and o _s is an integer) subset in the candidate frequency domain basis vector set can be respectively denoted as

Then a matrix can be constructed based on the N _s beam vectors in the o _f subset

Therefore, each frequency-domain basis vector in the candidate frequency-domain basis vector set can be taken from a DFT matrix or an oversampled DFT matrix, or from a conjugate transpose matrix of a DFT matrix or a conjugate transpose matrix of an oversampled DFT matrix. Each column vector in the set of candidate frequency domain basis vectors may be referred to as a DFT vector or an oversampled DFT vector. In other words, the frequency domain basis vector can be a DFT vector or an oversampled DFT vector.

其中，w₁至w_Nf是与N_f个频域单元对应的N_f个列向量，每个列向量可以是每个频域单元对应的目标预编码矩阵，各列向量的长度均可以为N_s。该N_f个列向量分别对应N_f个频域单元的目标预编码向量。即空频矩阵可以视为将N_f个频域单元对应的目标预编码向量组合构成的联合矩阵。10. Space-frequency precoding matrix: In this embodiment of the present application, the space-frequency precoding matrix can be understood as a matrix composed of precoding matrices corresponding to each frequency domain unit (the precoding matrix corresponding to each frequency domain unit performs a matrix splicing), which is used to determine an intermediate quantity of the precoding matrix corresponding to each frequency domain unit. For the terminal device, the space-frequency precoding matrix may be determined by the precoding matrix or channel matrix corresponding to each frequency domain unit. For example, the space-frequency precoding matrix can be denoted as H,

Wherein, w ₁ to w _Nf are N _{f column vectors corresponding to N f frequency} domain units, each column vector may be a target precoding matrix corresponding to each frequency domain unit, and the length of each column vector may be N _s . The N _f column vectors respectively correspond to the target precoding vectors of the N _f frequency domain units. That is, the space-frequency matrix can be regarded as a joint matrix formed by combining the target precoding vectors corresponding to the N _f frequency domain units.

11. Dual-domain compression: It can include two-dimensional compression of spatial-domain compression and frequency-domain compression. The spatial domain compression may specifically refer to selecting one or more spatial domain vectors from the spatial domain vector set as a vector for constructing a precoding vector. Frequency-domain compression may refer to selecting one or more frequency-domain basis vectors from a set of frequency-domain basis vectors as vectors for constructing precoding vectors. Among them, a matrix constructed by a space-domain vector and a frequency-domain basis vector can be called, for example, a space-frequency component matrix. The selected one or more space-domain vectors and one or more frequency-domain basis vectors may construct one or more space-frequency component matrices. The weighted sum of the one or more space-frequency component matrices can be used to construct a space-frequency precoding matrix corresponding to a spatial layer. In other words, the space-frequency precoding matrix can be approximated as a weighted sum of space-frequency component matrices constructed by the above-mentioned selected one or more space-domain vectors and one or more frequency-domain basis vectors. Based on the space-frequency precoding matrix corresponding to a spatial layer, the precoding vector corresponding to each frequency domain unit on the spatial layer can be determined.

Specifically, the selected one or more spatial domain vectors may constitute a spatial domain beam base matrix W ₁ , wherein each column vector in W ₁ corresponds to one selected spatial domain vector. The selected one or more frequency domain basis vectors may form a frequency domain basis matrix W ₃ , wherein each column vector in W ₃ corresponds to one selected frequency domain basis vector. The space-frequency precoding matrix H can be expressed as the result of linear combination of the selected one or more space-domain vectors and the selected one or more frequency-domain base vectors,

此时，W₁可以表示为In one implementation, if dual polarization directions are used, L spatial vectors are selected for each polarization direction, and the dimension of W ₁ is 2N _s × 2L. In a possible implementation, the two polarization directions use the same L spatial vectors

At this time, W ₁ can be expressed as

表示选择的第i个空域向量，i＝0,1,…,L-1。in

Represents the selected ith space vector, i=0,1,...,L-1.

的 维度为M×N_f，W₃中的每一个列向量对应一个频域基向量，此时每个空域向量对应的频域基 向量均为W₃中的M个频域基向量。

为空频合并系数矩阵，维度为2L×M。For example, for a spatial layer, if the same M frequency-domain basis vectors are selected for each spatial-domain basis vector, then

The dimension of is M×N _f , each column vector in W ₃ corresponds to a frequency-domain basis vector, and the frequency-domain basis vectors corresponding to each air-domain vector are all M frequency-domain basis vectors in W ₃ .

is the space-frequency combining coefficient matrix, and the dimension is 2L×M.

中的第i行对应2L个空域向量中的第i个空域向量，空频合并系 数矩阵

中的第j列对应M个频域基向量中的第j个频域基向量。第i个空域向量对应的空频合并系数向量为空频合并系数矩阵

中的第i个行向量，第i个空域向量对应的空频合并系数为空频合并系数矩阵

中的第i个行向量中包含的元素。Space-Frequency Combining Coefficient Matrix

The ith row in corresponds to the ith space vector in the 2L space vector, space-frequency combining coefficient matrix

The j-th column in corresponds to the j-th frequency-domain basis vector among the M frequency-domain basis vectors. The space-frequency combining coefficient vector corresponding to the ith space vector is the space-frequency combining coefficient matrix

The i-th row vector in , the space-frequency combining coefficient corresponding to the i-th space vector is the space-frequency combining coefficient matrix

The elements contained in the ith row vector in .

其中

为第i个空域向量对应的M_i个频域基向量构成的M_i行N_f列的矩阵。

其中

是第i个空域向量对应的维度是1*M_i的空频合并系数矩阵，

中包含的空频合并系数为第i个空域向量对应的空频合并系数。In addition, each of the L spatial domain vectors may also correspond to a different frequency domain basis vector. at this time,

in

is a matrix of M _i rows and N _f columns formed by M _i frequency domain base vectors corresponding to the i th space domain vector.

in

is the space-frequency combining coefficient matrix whose dimension corresponding to the ith space vector is 1*M _i ,

The space-frequency combining coefficients contained in are the space-frequency combining coefficients corresponding to the ith space vector.

此时W₃中的每一个行向量对应选择的一 个频域基向量。In addition, the space-frequency matrix V can also be expressed as

At this time, each row vector in W ₃ corresponds to a selected frequency domain base vector.

Since the dual-domain compression is performed separately in both the spatial and frequency domains, the terminal device can feed back the selected one or more spatial domain vectors and one or more frequency domain base vectors to the network device during feedback, without the need for Combining coefficients (eg, including amplitude and phase) of the sub-bands are fed back separately based on each frequency-domain unit (eg, sub-band). Therefore, the feedback overhead can be greatly reduced. At the same time, since the frequency domain base vector can represent the variation law of the channel in frequency, the variation of the channel in the frequency domain is simulated by the linear superposition of one or more frequency domain base vectors. Therefore, high feedback accuracy can still be maintained, so that the precoding matrix recovered by the network device based on the feedback from the terminal device can still be better adapted to the channel.

中第i 行第j列的元素为第i个空域向量与第j个频域基向量构成的向量对所对应的合并系数。12. Space-frequency combining coefficient, amplitude and phase: The space-frequency combining coefficient is also called combining coefficient, which is used to represent the weight of a vector pair formed by a space-domain vector and a frequency-domain base vector used to construct a space-frequency precoding matrix. As mentioned above, the space-frequency combining coefficients have a one-to-one correspondence with a vector pair formed by a space-domain vector and a frequency-domain base vector, or each space-frequency combining coefficient corresponds to a space-domain vector and a frequency-domain base vector. Specifically, the space-frequency combining coefficient matrix

The element in the i-th row and the j-th column is the combination coefficient corresponding to the vector pair formed by the i-th space domain vector and the j-th frequency domain base vector.

中 包含的2LM个合并系数的子集。具体地，网络设备可以配置每个空间层对应的终端设备可 以上报的空频合并系数的最大数量K₀，其中K₀<＝2LM。K₀与

中包含的合并系数总数2LM可 以存在比例关系，例如K₀＝β·2LM，β的取值可以为{3/4,1/2,1/4}。此外，终端设备可 以仅上报K₁个幅度非0的空频合并系数，且K₁<＝K₀。In an implementation manner, in order to control the reporting overhead, the terminal device may only report the space-frequency combining coefficient matrix

A subset of the 2LM pooling coefficients contained in . Specifically, the network device can configure the maximum number K ₀ of space-frequency combining coefficients that can be reported by the terminal device corresponding to each spatial layer, where K ₀ <=2LM. K ₀ with

The total number of merging coefficients 2LM contained in may have a proportional relationship, for example, K ₀ =β·2LM, and the value of β may be {3/4, 1/2, 1/4}. In addition, the terminal device may only report K ₁ space-frequency combining coefficients with non-zero amplitudes, and K ₁ <=K ₀ .

Each space-frequency combining coefficient may include magnitude and phase. For example, in the space-frequency combining coefficient ae ^jθ , a is the amplitude and θ is the phase.

In an implementation manner, for the reported K ₁ space-frequency combining coefficients, their amplitude values and phase values may be independently quantized. The quantization method for the amplitude includes the following steps:

1) For K ₁ merging coefficients, taking the merging coefficient with the largest amplitude value as a reference, the K ₁ merging coefficients are normalized. If the i-th merging coefficient is c _i before normalization, then after normalization it is c' _i = _ci / _ci* , where _ci* is the combining coefficient with the largest amplitude value. After normalization, the merging coefficient with the largest quantization reference amplitude value is 1.

比特。2) The terminal device reports the index of the merging coefficient with the largest amplitude value, and the indication information indicating the index of the merging coefficient with the largest amplitude value may include

bits.

3) For the polarization direction where the combining coefficient with the largest amplitude value is located, the quantization reference amplitude value is 1. For another polarization direction, the amplitude of the combining coefficient with the largest amplitude in the polarization direction can be used as the quantization reference amplitude value of the polarization direction. The quantization reference amplitude value is quantized and reported using 4 bits, and the candidate quantization reference amplitude value includes

差分幅度值表示相对于该极化方向所对应的量化参考幅度值的差异值，若一个合并系数所在极化方向所对应的量化参考幅度值为A，该合并系数量化后的差分幅度值为B，则该合并系数量化后的幅度值为A*B。4) For each polarization direction, take the quantization reference amplitude value corresponding to the polarization direction as a reference, and perform 3-bit quantization on the differential amplitude value of each combining coefficient, and the candidate differential amplitude values include:

The difference amplitude value represents the difference value relative to the quantization reference amplitude value corresponding to the polarization direction. If the quantization reference amplitude value corresponding to the polarization direction of a combining coefficient is A, the quantized differential amplitude value of the combining coefficient is B. , then the quantized amplitude value of the combined coefficient is A*B.

5) For the phase of each normalized combining coefficient, quantize by 3 bits (8PSK) or 4 bits (16PSK).

Among the multiple space-frequency combining coefficients corresponding to the multiple space-frequency component matrices, the amplitudes (or, in other words, the amplitudes) of some space-frequency combining coefficients may be zero, or close to zero, and their corresponding quantization values may be zero. A space-frequency combining coefficient whose magnitude is quantized by a quantization value of zero may be referred to as a zero-amplitude space-frequency combining coefficient. Correspondingly, some space-frequency combining coefficients have larger amplitudes, and their corresponding quantization values are not zero. The space-frequency combining coefficients whose amplitudes are quantized by non-zero quantization values may be referred to as space-frequency combining coefficients with non-zero amplitudes. In other words, the plurality of space-frequency combining coefficients consists of one or more space-frequency combining coefficients with non-zero amplitude and one or more space-frequency combining coefficients with zero amplitude.

It should be understood that the space-frequency combining coefficient can be indicated by a quantized value, an index of a quantized value, or a non-quantized value. The present application does not limit the indication mode of the space-frequency combining coefficient, as long as the opposite end knows the null value. The frequency combining factor can be used. Hereinafter, for convenience of description, the information for indicating the space-frequency combining coefficients is referred to as quantization information of the space-frequency combining coefficients. The quantization information can be, for example, a quantization value, an index, or any other information that can be used to indicate the space-frequency combining coefficients.

12. Spatial layer (layer): In MIMO, a spatial layer can be regarded as a data stream that can be independently transmitted. In order to improve the utilization rate of spectrum resources and improve the data transmission capability of the communication system, the network device can transmit data to the terminal device through multiple spatial layers.

The number of spatial layers is also the rank of the channel matrix. The terminal device can determine the number of spatial layers according to the channel matrix obtained by channel estimation. The precoding matrix can be determined according to the channel matrix. For example, the precoding matrix can be determined by performing SVD on the channel matrix or the covariance matrix of the channel matrix. In the SVD process, different spatial layers can be distinguished according to the size of the eigenvalues. For example, the precoding vector determined by the eigenvector corresponding to the largest eigenvalue may correspond to the first spatial layer, and the precoding vector determined by the eigenvector corresponding to the smallest eigenvalue may be associated with the Rth spatial layer. layer corresponds. That is, the eigenvalues corresponding to the first spatial layer to the Rth spatial layer decrease sequentially. To put it simply, the intensity of the R spatial layers decreases sequentially from the first spatial layer to the R-th spatial layer.

It should be understood that distinguishing different spatial layers based on eigenvalues is only a possible implementation manner, and should not constitute any limitation to the present application. For example, the protocol may also predefine other criteria for distinguishing the spatial layer, which is not limited in this application.

13. Channel State Information (CSI) report (report): in a wireless communication system, the information used to describe the channel attributes of a communication link reported by a receiving end (such as a terminal device) to a transmitting end (such as a network device). For example, the CSI report may include, but is not limited to, a precoding matrix indicator (PMI), a rank indicator (RI), a channel quality indicator (CQI), a channel state information reference signal (channel state information reference signal, CSI-RS resource indicator (CSI) -RS resource indicator, CRI) and layer indicator (layer indicator, LI), etc. It should be understood that the specific contents of the CSI listed above are only exemplary descriptions, and should not constitute any limitation to this application. The CSI may include one of the above listed Item or multiple items may also include other information used to characterize CSI other than those listed above, which is not limited in this application.

Take the terminal equipment reporting CSI to the network equipment as an example.

A terminal device may report one or more CSI reports within a time unit (eg, a slot), and each CSI report may correspond to a configuration condition for CSI reporting. The configuration condition of the CSI reporting can be determined by, for example, a CSI reporting setting (CSI reporting setting). The CSI reporting configuration may be used to indicate the time domain behavior, bandwidth, format corresponding to report quantity, etc. of CSI reporting. Among them, the time domain behavior includes, for example, periodic (periodic), semi-persistent (semi-persistent) and aperiodic (aperiodic). The terminal device may generate a CSI report based on a CSI report configuration.

The terminal equipment reporting one or more CSI reports in one time unit may be referred to as one CSI report.

In this embodiment of the present application, when the terminal device generates the CSI report, the content in the CSI report may be divided into two parts. For example, the CSI report may include a first part and a second part. The first part and the second part may be independently encoded. The payload size (size) of the first part may be predefined, and the payload size of the second part may be determined according to the information carried in the first part.

The network device may decode the first part according to the predefined payload size of the first part to obtain the information carried in the first part. The network device may determine the payload size of the second part according to the information obtained from the first part, and then decode the second part to obtain the information carried in the second part.

It should be understood that the first and second parts are similar to part 1 and part 2 of the CSI defined in the NR protocol TS38.214 release 15 (release 15, R15).

It should also be understood that, since the embodiments of the present application mainly involve the reporting of PMI and the reporting of RI, the enumeration of the content in the first part and the second part of the CSI report in the following embodiments may include related information such as PMI and RI, but does not involve other . However, it should be understood that this should not constitute any limitation to the present application. In addition to the information contained or indicated in the first part and the second part of the CSI report listed in the following embodiments, the first part of the CSI report may also include one or more of CQI and RI, or may also include Other information about the feedback overhead may be predefined, and the second part of the CSI report may also include other information. This application does not limit this.

Before introducing the embodiments of the present application, the following points are first made.

First, for the convenience of understanding and description, the main parameters involved in this application are described as follows:

R ₀ : the predefined maximum number of spatial layers;

R: the number of spatial layers indicated in RI;

L: the number of spatial basis vectors in each spatial layer;

M: The number of frequency domain basis vectors in each spatial layer.

Second, in this embodiment, for the convenience of description, when numbering is involved, the numbering may start from 1 consecutively. For example, the R spatial layers may include the 1st spatial layer to the Rth spatial layer, the L beam vectors may include the 1st beam vector to the L th beam vector, and so on, which will not be illustrated here. Of course, the specific implementation is not limited to this, for example, the numbers can also be consecutively numbered from 0. It should be understood that the above descriptions are all settings for the convenience of describing the technical solutions provided by the embodiments of the present application, and are not intended to limit the scope of the present application.

Third, in the embodiments of the present application, transformations of matrices and vectors are involved in many places. For ease of understanding, a unified description is made here. The superscript T represents the transpose, for example, A ^T represents the transpose of the matrix (or vector) A; the superscript H represents the conjugate transpose, for example, A ^H represents the conjugate transpose of the matrix (or vector) A. Hereinafter, for the sake of brevity, descriptions of the same or similar situations are omitted.

Fourth, in the embodiments of the present application, both the beam vector and the frequency domain base vector are used as examples to illustrate the embodiments provided by the present application, but this should not constitute any limitation to the present application. Based on the same concept, those skilled in the art can also think of other more possible representations.

Fifth, in this embodiment of the present application, "for indicating" may include direct indicating and indirect indicating. For example, when describing a certain indication information for indicating information I, the indication information may directly indicate I or indirectly indicate I, but it does not mean that I must be carried in the indication information.

The following is a detailed introduction and description of the solution of the present application.

It should be noted that in this application, the network device may indicate a maximum number of spatial layers R0, and the number of spatial layers actually used by the terminal device is R, which may be equal to R0 or a number smaller than R0. This application This is not limited.

The CSI report sent by the terminal device to the network device includes CSI part 1 and CSI part 2, where the contents respectively included in CSI part 1 and CSI part 2 are as described in the background art.

This application is mainly designed for the above-mentioned CSI report, including the following design solutions 1 to 3, which are as follows:

Design solution 1. The CSI sent by the terminal device to the network device includes the first indication information, the second indication information and the third indication information. The first indication information is used to indicate the size of the union formed by the frequency domain basis vectors corresponding to the R spatial layers respectively, and the second indication information is used to indicate that each frequency domain basis vector in the union is in the candidate frequency domain basis The index in the vector set, and the third indication information is used to indicate the index of some or all of the frequency domain basis vectors corresponding to the R spatial layers respectively in the union set.

Optionally, the CSI part 1 includes the above-mentioned first indication information, and the CSI part 2 includes the above-mentioned second indication information and third indication information. That is, the solution of the present application first indicates the number of frequency domain basis vectors included in the union of frequency domain basis vectors corresponding to all spatial layers through the first indication information of CSI part 1, and further indicates the frequency domain basis vectors included in the union through CSI part 2. The domain basis vector and the frequency domain basis vector corresponding to each spatial layer are which one or several frequency domain basis vectors correspond to the union.

For example, based on the solution of the present application, the first indication information is added to the CSI part 1 shown in Table 1 to obtain the CSI part 1 shown in Table 1'.

Table 1' CSI report (CSI part 1)

Among them, RI is used to indicate the number R of spatial layers.

The specific implementation methods of the above-mentioned first indication information, second indication information and third indication information will be described below.

1. The first instruction information

The number of bits occupied by the first indication information can be implemented in multiple ways. As an example, two different implementation ways are given below.

其中，R₀为支持的最 大空间层数，R小于或等于R₀，N_f为所述候选频域基向量集合的大小，M_i为第i个空间层对 应的频域基向量的数量，i取值为1至R₀，

表示向上取整。Implementation mode 1, the number of bits occupied by the first indication information is

Wherein, R ₀ is the maximum number of spatial layers supported, R is less than or equal to R ₀ , N _f is the size of the candidate frequency-domain basis vector set, M _i is the number of frequency-domain basis vectors corresponding to the ith spatial layer, i takes values from 1 to R ₀ ,

Indicates rounded up.

All spatial beam basis vectors corresponding to each spatial layer may adopt the same frequency domain basis vector, and the same frequency domain basis vector adopted by the spatial beam basis vectors corresponding to each spatial layer is called the frequency domain basis vector corresponding to the spatial layer. The number M _i of frequency domain basis vectors corresponding to each spatial layer may be configured by the network device, or may be a preset value. In one implementation method, the network device configures the number M _i of frequency domain basis vectors corresponding to the ith spatial layer, then for the ith spatial layer, the terminal device will select M _i frequency domain basis vectors, and report the selected M The index corresponding to the _i frequency-domain basis vectors. In one implementation method, the network device configures the maximum value M _i,0 of the number of frequency domain basis vectors corresponding to the ith spatial layer, and for the ith spatial layer, the terminal device may select M _i ≤M _i,0 frequency-domain basis vectors, and report the indices corresponding to the selected M _i frequency-domain basis vectors. The number M _i of frequency domain basis vectors corresponding to each spatial layer may be the same or different. In an implementation method, for the ith spatial layer and the jth spatial layer, i>j, then M _i ≤ M _j , M _j and M _i may have a preset proportional relationship, for example, M _i =αM _j , α<1.

Therefore, the bit overhead of the first indication information in this application has an associated relationship with the maximum value of the number of frequency-domain basis vectors corresponding to each spatial layer configured by the network device. In an implementation manner, the network device configures the maximum value M _i,0 of the number of frequency domain basis vectors corresponding to the ith spatial layer, and the number of bits occupied by the first indication information is

其中， R₀为支持的最大空间层数，R小于或等于R₀，N_f为所述候选频域基向量集合的大小，M_i为第 i个空间层对应的频域基向量的数量，i取值为1至R₀，

表示向上取整，所述第一指示信息的取值范围为从M₁到

所述M₁为第1个空间层对应的频域基向量的数量。Implementation mode 2, the number of bits occupied by the first indication information is

Among them, R ₀ is the maximum number of spatial layers supported, R is less than or equal to R ₀ , N _f is the size of the candidate frequency-domain basis vector set, M _i is the number of frequency-domain basis vectors corresponding to the ith spatial layer, i takes values from 1 to R ₀ ,

Indicates rounding up, and the value range of the first indication information is from M ₁ to

The M ₁ is the number of frequency domain basis vectors corresponding to the first spatial layer.

Based on this implementation manner, there is a corresponding relationship between the value of the first indication information and the size of the union.

In an implementation manner, the size of the union is equal to the sum of the value of the first indication information and M ₁ , and the minimum value of the value of the first indication information is 0.

In yet another implementation manner, the corresponding relationship between the value of the first indication information and the size of the union is predefined. For example, the corresponding relationship can be defined in the form of a table.

2. Second instruction information

Method 1. The second indication information is indicated in the form of a combination number

其中，X为所述并集的大小，X为正整数，

表 示向上取整，

表示从N_f个频域基向量中取出X个频域基向量的取法的数量，N_f为所述候 选频域基向量集合的大小。The number of bits occupied by the second indication information is

where X is the size of the union, X is a positive integer,

means round up,

Indicates the number of ways to extract X frequency-domain basis vectors from N _f frequency-domain basis vectors, where N _f is the size of the candidate frequency-domain basis vector set.

Method 2. The second indication information is indicated in the form of a bitmap (bitmap).

The second indication information may be a bitmap, where the number of bits occupied by the bitmap is N _f , where N _f is the size of the candidate frequency domain basis vector set. For example, when the i-th bit of the bitmap is 1, it means that the union includes the i-th frequency-domain basis vector in the candidate frequency-domain basis vector set, and the i-th frequency-domain basis vector is the same as the bit bit. The frequency domain basis vector corresponding to the ith bit of the graph.

3. The third indication information (wherein R is greater than or equal to 2)

Method 1. The third indication information is indicated in the form of a combination number

其中，X为所述并集的大小，X为正整数，

表示向上取整,M_i为第i个空间层对应的频域基向量的数量，i取值为1至R，

表示从X个频域基向量中取出M_i个频域基向量的取法的数量。The third indication information includes R field information, the ith field information in the R field information is used to indicate the index of the frequency domain basis vector corresponding to the ith spatial layer in the union, and the ith field The number of bits occupied by the field information is

where X is the size of the union, X is a positive integer,

Represents rounded up, M _i is the number of frequency domain basis vectors corresponding to the i-th spatial layer, i takes values from 1 to R,

Indicates the number of ways to extract M _i frequency-domain basis vectors from X frequency-domain basis vectors.

Method 2. The third indication information is indicated in the form of a bitmap (bitmap).

The third indication information includes R bitmaps, one bitmap is used to indicate the index of the frequency domain base vector corresponding to one spatial layer in the union, and the number of bits occupied by the R bitmaps are all X, X is the size of the union, and X is a positive integer. For example, for the ith bitmap (corresponding to the ith spatial layer), when the jth bit of the bitmap is 1, it means that the frequency domain basis vector corresponding to the ith spatial layer includes the union set. The jth frequency domain base vector of , where the jth frequency domain base vector is the frequency domain base vector corresponding to the jth bit of the bitmap.

4. The third indication information (wherein, R=2, this method is a special embodiment when R=2)

Method 1. The third indication information is indicated in the form of a combination number

所述第二字段信息占用的比特数等于

X为所述并集的大小，X 为正整数，

表示向上取整,M_i为第i个空间层对应的频域基向量的数量，i取值为1至2，

表示从X个频域基向量中取出M₁个频域基向量的取法的数量，

表示从M₁个频域 基向量中取出M₁+M₂-X个频域基向量的取法的数量。The third indication information includes first field information and second field information, where the first field information is used to indicate the index of the frequency domain basis vector corresponding to the first spatial layer in the union, and the second field information is used for The frequency-domain basis vectors in the intersection of the frequency-domain basis vectors corresponding to the first spatial layer and the frequency-domain basis vectors corresponding to the second spatial layer are in the frequency-domain basis vectors corresponding to the first spatial layer The index of ; wherein, the number of bits occupied by the first field information is equal to

The number of bits occupied by the second field information is equal to

X is the size of the union, X is a positive integer,

Represents rounded up, M _i is the number of frequency domain basis vectors corresponding to the ith spatial layer, i is 1 to 2,

Indicates the number of ways to extract M ₁ frequency domain basis vectors from X frequency domain basis vectors,

Indicates the number of ways to extract M ₁ +M ₂ -X frequency-domain basis vectors from M ₁ frequency-domain basis vectors.

The frequency-domain basis vector corresponding to the second spatial layer includes the frequency-domain basis vector indicated by the second field information and the frequency-domain basis vector except the frequency-domain basis vector indicated by the first field information removed from the union. vector.

Method 2. The third indication information is indicated in the form of a bitmap (bitmap).

The third indication information includes first field information and second field information, the first field information is a first bitmap, and the first bitmap is used to indicate that the frequency domain base vector corresponding to the first spatial layer is in the The index in the union, the second field information is a second bitmap, and the second bitmap is used to indicate that the frequency domain base vector corresponding to the first spatial layer corresponds to the second spatial layer The index of the frequency-domain basis vector in the intersection of the frequency-domain basis vectors in the frequency-domain basis vector corresponding to the first spatial layer; wherein, the number of bits occupied by the first bitmap is X, and X is the The size of the union, X is a positive integer, and the number of bits occupied by the second bitmap is the number of frequency-domain basis vectors corresponding to the first spatial layer.

The frequency-domain basis vector corresponding to the second spatial layer includes the frequency-domain basis vector indicated by the second field information and the frequency-domain basis vector except the frequency-domain basis vector indicated by the first field information removed from the union. vector.

It should be noted that the above description takes the example that the first field information corresponds to the first spatial layer and the second field information corresponds to the second spatial layer. In practical applications, the first field information may also correspond to the second spatial layer. , the second field information corresponds to the first spatial layer, which is not limited in this application.

It should be noted that when R=2, a special solution of the third indication information is given above, and this solution can further reduce the bit overhead. Therefore, in a specific implementation, when R=2, the third indication information implementation method of the above-mentioned solution 3 may be adopted, or the third indication information implementation method of the above-mentioned solution 4 may be adopted.

In the following, different solutions of the above-mentioned first indication information, second indication information and third indication information will be explained with reference to a specific example.

As shown in FIG. 2A , it is an example diagram of the index reporting of the frequency domain basis vector provided by the present application. Assuming that the space-frequency compression codebook supports a maximum number of spatial layers of 4, the spatial-domain beam basis vectors corresponding to each spatial layer use the same frequency-domain basis vectors, and each spatial layer independently selects the corresponding frequency-domain basis vectors. For the ith spatial layer (1<=i<=4), the corresponding number of frequency domain basis vectors is M _i , and the M _i frequency domain basis vectors are N _f frequency domain basis vectors from the candidate frequency domain basis vector set selected from the basis vectors.

As shown in FIG. 2A , the set of candidate frequency-domain basis vectors includes 10 frequency-domain basis vectors, and the indices are respectively 1 to 10 (of course, it can also be 0 to 9, which is not limited in this application), that is, N _f =10. The number of spatial layers R is equal to 2 (ie, rank=2, that is, RI=2), which are respectively referred to as the first spatial layer and the second spatial layer. The indices of the frequency-domain basis vectors corresponding to the first spatial layer in the candidate frequency-domain basis vector set are 1, 2, 3, and 9, and the frequency-domain basis vectors corresponding to the second spatial layer are in the candidate frequency-domain basis vector set. The indices are 3, 4, 9, and 10. Therefore, the union of the frequency-domain basis vectors corresponding to the first spatial layer and the frequency-domain basis vectors corresponding to the second spatial layer is the index in the candidate frequency-domain basis vector set is 1, 2 , 3, 4, 9, 10 frequency domain basis vectors.

To sum up, based on the embodiment of FIG. 2A , the candidate basis vector set = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}, N _f =10, the corresponding The index of the frequency-domain basis vector in the candidate frequency-domain basis vector set is {1, 2, 3, 9}, and the index of the frequency-domain basis vector corresponding to the second spatial layer in the candidate frequency-domain basis vector set is {3, 4 , 9, 10}, union={1, 2, 3, 4, 9, 10}, X=6, M ₁ =4, M ₂ =4.

Based on the above-mentioned design scheme 1 of the present application and the embodiment of FIG. 2A , then:

1. The first instruction information

1. Use the implementation method described above 1

That is, the number of bits occupied by the first indication information is

个 比特，R₀为支持的最大空间层的数量。Since the overhead of the CSI part 1 is a fixed length, and the network device does not know the rank value corresponding to the reported CSI before interpreting the CSI part 1, the first indication information needs to be the maximum possible value of the supported union. Reference is made to design the bit length of the first indication information. Specifically, the first indication information needs to include

bits, R ₀ is the maximum number of spatial layers supported.

For example, if the maximum number of supported spatial layers (ie R ₀ ) is 4, and the maximum number of frequency domain basis vectors corresponding to the 4 spatial layers is 4/4/4/4, then the frequency domain corresponding to the 4 spatial layers There are at most N _f =10 frequency domain base vectors in the union formed by the base vectors, so the first indication information is 4 bits. Based on the example of FIG. 2A, the 4 bits specifically indicate that the number is 6 (ie, the size of the union).

2. Use the implementation method described above 2

That is, the number of bits occupied by the first indication information is

Taking FIG. 2A as an example, based on this implementation method, the value range of the first indication information is 4-10, so the number of bits occupied by the first indication information is 3.

In an implementation manner, the size of the union is equal to the sum of the value of the first indication information and M ₁ . Taking FIG. 2A as an example, M ₁ =4, and the size of the union = 6, so the value of the first indication information is The value is 2. Since the number of bits occupied by the first indication information is 3, the value of the first indication information may be 010.

In yet another implementation manner, the corresponding relationship between the value of the first indication information and the size of the union is predefined. For example, the corresponding relationship can be defined in the form of a table. Taking Fig. 2A as an example, the value range of the first indication information is 4-10, so the following table 2 can be predefined.

Table 2 Correspondence table of the number of bits occupied by the first indication information and the size of the union

The number of bits occupied by the first indication information size of union (X) 000 4 001 5 010 6 011 7 100 8 101 9 110 10

Therefore, for the specific example of FIG. 2A , when X=6, the value of the first indication information is 010.

2. Second instruction information

Method 1. The second indication information is indicated in the form of a combination number

个比特，该8个比特用于指示并集中的频 域基向量在候选频域基向量集合中的索引，即该8个比特指示的是：1、2、3、4、9、10。Based on FIG. 2A , the second indication information includes

The 8 bits are used to indicate the indices of the frequency-domain basis vectors in the union in the candidate frequency-domain basis vector set, that is, the 8 bits indicate: 1, 2, 3, 4, 9, and 10.

Method 2. The second indication information is indicated in the form of a bitmap (bitmap).

Based on FIG. 2A , the second indication information is a bitmap containing 10 bits, and each bit of the bitmap corresponds to an index of a candidate frequency-domain basis vector in the candidate frequency-domain basis vector set, so the Bits 1, 2, 3, 4, 9, and 10 are set to 1, and the remaining bits are set to 0.

It should be noted that here, the bit is "1" to indicate selected, and "0" to indicate unselected. In practical applications, the bit may also be "0" to indicate that it is selected, and "1" to indicate that it is not selected, which is not limited in this application. The usage method of the bitmap is uniformly described here, and the usage method of the bitmap appearing anywhere in this application may refer to the description here, and will not be repeated here.

3. The third instruction information

Method 1. The third indication information is indicated in the form of a combination number

Based on FIG. 2A , the third indication information includes two fields of information, wherein the first field information is used to indicate the index of the frequency domain basis vector corresponding to the first spatial layer in the union, so the first field information indicates is: 1, 2, 3, 5, which indicates the first, second, third and fifth indices in the union, which are the corresponding frequency-domain basis vectors of the first spatial layer in the candidate frequency-domain basis vector set index in . Alternatively, it can be understood that the first field information indicates which frequency-domain basis vectors in the foregoing union are the frequency-domain basis vectors corresponding to the first spatial layer. Among them, the number of bits occupied by the first field information is

Similarly, the second field information is used to indicate the index of the frequency-domain basis vector corresponding to the second spatial layer in the union, so the second field information is indicated as: 3, 4, 5, 6, which indicates that The 3rd, 4th, 5th and 6th indices in the union set are the indices of the corresponding frequency-domain basis vectors of the second spatial layer in the set of candidate frequency-domain basis vectors. Alternatively, it can be understood that the second field information indicates which frequency-domain basis vectors in the foregoing union are the frequency-domain basis vectors corresponding to the second spatial layer. Among them, the number of bits occupied by the second field information is

Method 2. The third indication information is indicated in the form of a bitmap (bitmap).

Based on FIG. 2A , the second indication information includes 2 bitmaps, which are called the first bitmap and the second bitmap respectively, wherein the first bitmap and the second bitmap are both 6 bits.

For the first bitmap, each bit of the first bitmap corresponds to an index of a frequency-domain basis vector in the above union, so bits 1, 2, 3, and 5 of the first bitmap are set to 1, and the rest bit is set to 0.

For the second bitmap, each bit of the second bitmap corresponds to an index of a frequency-domain basis vector in the above union, so bits 3, 4, 5, and 6 of the second bitmap are set to 1, and the rest bit is set to 0.

4. The third indication information (wherein, R=2, this method is a special embodiment when R=2)

Method 1. The third indication information is indicated in the form of a combination number

Based on FIG. 2A , the third indication information includes two fields of information, wherein the first field information is used to indicate the index of the frequency domain basis vector corresponding to the first spatial layer in the union, so the first field information indicates are: 1, 2, 3, and 5, which indicate the first, second, third, and fifth indices in the union, which are the indices of the corresponding frequency-domain basis vectors of the first spatial layer in the union. Alternatively, it can be understood that the first field information indicates which frequency-domain basis vectors in the foregoing union are the frequency-domain basis vectors corresponding to the first spatial layer. Among them, the number of bits occupied by the first field information is

Since there are only 2 spatial layers, in the X=6 frequency domain basis vectors contained in the union of frequency domain basis vectors, except for the 4 frequency domain basis vectors corresponding to the first spatial layer, the remaining 2 frequency domain basis vectors The basis vectors (frequency domain basis vectors 4 and 10) must correspond to the second spatial layer. Therefore, the second field information is used to indicate that the frequency-domain basis vectors in the intersection of the frequency-domain basis vectors corresponding to the first spatial layer and the frequency-domain basis vectors corresponding to the second spatial layer correspond to the first spatial layer The index in the frequency-domain basis vector of (that is, the frequency-domain basis vectors corresponding to indices 3 and 9). Specifically, since the index of the frequency domain basis vector corresponding to the first spatial layer is {1, 2, 3, 9}, the frequency domain basis vector corresponding to the first spatial layer is the same as the frequency domain basis vector corresponding to the second spatial layer. The index of the frequency domain basis vector in the intersection of vectors is {3, 9}, so the second field information is indicated as: 2, 3, that is, it indicates the second and third in {1, 2, 3, 9} 3 indexes. For the indices of the other two frequency-domain basis vectors (that is, 4 and 10) in the frequency-domain basis vectors corresponding to the second spatial layer, no additional indication is required.

For network devices, through the first field information, it can be determined that the index of the frequency domain basis vector corresponding to the first spatial layer is {1, 2, 3, 9}, and through the second field (indicating indices 3 and 9) and the union to remove the frequency domain basis vectors other than the frequency domain basis vectors indicated by the first field information (ie, 4 and 10), and learn that the index of the frequency domain basis vectors corresponding to the second spatial layer is {3 , 4, 9, 10}.

个比特。Therefore, for the second spatial layer, it is only necessary to indicate which two of the four frequency-domain basis vectors corresponding to the first spatial layer are the corresponding frequency-domain basis vectors 2 and 9 . Therefore, the indication information indicating the index of the frequency-domain basis vector corresponding to the second spatial layer only needs to contain

bits.

Method 2. The third indication information is indicated in the form of a bitmap (bitmap).

Based on FIG. 2A , the second indication information includes two bitmaps, which are called the first bitmap and the second bitmap respectively, wherein the first bitmap is 6 bits, and the second bitmap is 4 bits (that is, the number of frequency domain basis vectors corresponding to the first spatial layer).

For the first bitmap, each bit of the first bitmap corresponds to an index of a frequency-domain basis vector in the above union, so bits 1, 2, 3, and 5 of the first bitmap are set to 1, and the rest bit is set to 0.

For the second bitmap, each bit of the second bitmap corresponds to the index of the frequency domain basis vector indicated by a bit set to 1 in the first bitmap, so 3, 4 of the first bitmap Bits (ie, indices 3 and 9 corresponding to the frequency domain basis vector) are set to 1 and the remaining bits are set to 0.

The above-mentioned design scheme 1 has the following beneficial effects: this scheme effectively utilizes the feature that the frequency domain basis vectors corresponding to multiple spatial layers have a certain overlap, and introduces a new indication field in both CSI part 1 and CSI part 2. Specifically, by first reporting the union of the frequency domain basis vectors corresponding to all spatial layers, the unselected vectors in the Nf candidate frequency domain basis vector sets are excluded, and the size of the indicated candidate frequency domain basis vector set is further reduced. Subsequently, it is only necessary to indicate which frequency domain basis vectors in the union of the frequency domain basis vectors corresponding to each spatial layer are, thereby reducing the indication overhead. In addition, for rank=2, the correspondence between only two spatial layers is used, that is, the frequency domain basis vectors contained in the union of frequency domain basis vectors either correspond to spatial layer 1 or spatial layer 2, thereby further reducing the indication overhead. .

Design solution 2: The CSI sent by the terminal device to the network device includes the first indication information, the second indication information and the third indication information. Wherein, the first indication information is used to indicate the size of the first set, and the first set includes N ₃ frequency-domain basis vectors with consecutive indices in the candidate frequency-domain basis vector set, and the N ₃ frequency-domain basis vectors The basis vector includes a union formed by the frequency domain basis vectors corresponding to the R spatial layers respectively, and the index loop is the first frequency domain basis vector and the last frequency domain basis vector in the N ₃ consecutive frequency domain basis vectors. are the frequency-domain basis vectors in the union; the second indication information is used to indicate the index of the first frequency-domain basis vector in the first set in the candidate frequency-domain basis vector set; The third indication information is used to indicate indices in the first set of some or all of the frequency domain basis vectors corresponding to the R spatial layers respectively, where R is an integer greater than or equal to 1.

Among them, the set of candidate frequency domain basis vectors includes N _f frequency domain basis vectors (that is, candidate frequency domain basis vectors), and the indices are respectively 0, 1, ..., N _f -1, or 1, 2, ... , N _f . The index cycle here refers to the continuous N ₃ frequency domain basis vectors: starting from one of the N _f indices (including this index), select N ₃ indices in succession (if the last index is encountered, continue from The first index starts to continue to be selected), the frequency domain base vectors corresponding to the N ₃ indices are the N ₃ frequency domain base vectors with consecutive index cycles. Among them, the value range of N ₃ is from M ₁ to N _f .

For example, N _f = 10, the indices are 0, 1, 2, ..., 9 (of course, it can also be 1, 2, ..., 10), N ₃ =5, if you select from index 3, then The N ₃ frequency-domain basis vectors with consecutive index cycles are: frequency-domain basis vectors corresponding to index 3, index 4, index 5, index 6, and index 7 respectively. If the selection starts from index 8, the N ₃ frequency-domain basis vectors with consecutive index cycles are: frequency-domain basis vectors corresponding to index 8, index 9, index 0, index 1, and index 2 respectively.

Further, the first frequency-domain basis vector among the N ₃ consecutive frequency-domain basis vectors in the index cycle described in this application refers to the frequency-domain basis vector corresponding to the first index among the N ₃ indexes. For example, for the first example above, the first frequency-domain basis vector in the N ₃ frequency-domain basis vectors refers to the frequency-domain basis vector corresponding to index 3. For another example, for the second example above, the first frequency-domain basis vector among the N ₃ frequency-domain basis vectors refers to the frequency-domain basis vector corresponding to index 8.

Optionally, the CSI part 1 includes the above-mentioned first indication information, and the CSI part 2 includes the above-mentioned second indication information and third indication information. That is, the solution of the present application first indicates the size of the first set through the first indication information in the CSI part 1, and further indicates through the second indication information in the CSI part 2 that the first frequency domain basis vector in the first set is in the index in the candidate frequency domain basis vector set, so that all frequency domain basis vectors included in the first set can be determined according to the first indication information and the second indication information. In addition, the third indication information in the CSI part 2 indicates which frequency domain base vector or which frequency domain base vectors corresponding to each spatial layer are in the first set.

For example, based on the solution of the present application, the first indication information is added to the CSI part 1 shown in Table 1, and the CSI part 1 shown in Table 1" is obtained.

Table 1 "CSI report (CSI part 1)

Among them, RI is used to indicate the number R of spatial layers.

The specific implementation methods of the above-mentioned first indication information, second indication information and third indication information will be described below.

1. The first instruction information

其中，N_f为所述候选频域基向量 集合的大小，所述M₁为第1个空间层对应的频域基向量的数量，

表示向上取整，所述第 一指示信息的取值范围为从M₁到N_f。作为又一种实现方式，该第一指示信息占用的比特数 还可以为

The number of bits occupied by the first indication information is

Wherein, N _f is the size of the candidate frequency domain basis vector set, and the M ₁ is the number of frequency domain basis vectors corresponding to the first spatial layer,

means rounding up, and the value range of the first indication information is from M ₁ to N _f . As another implementation manner, the number of bits occupied by the first indication information may also be

There is a corresponding relationship between the value of the first indication information and the size of the first set.

In an implementation manner, the size of the first set is equal to the sum of the value of the first indication information and M ₁ , and the minimum value of the value of the first indication information is 0.

In yet another implementation manner, the corresponding relationship between the value of the first indication information and the size of the first set is predefined. For example, the corresponding relationship can be defined in the form of a table.

2. Second instruction information

其中，

表示向上取整，N_f为所述候选频 域基向量集合的大小。The number of bits occupied by the second indication information is

in,

denotes rounding up, and N _f is the size of the candidate frequency domain basis vector set.

3. The third indication information (wherein R is greater than or equal to 1)

Method 1. The third indication information is indicated in the form of a combination number

其中，

表示向上取整，M_i为第i个空间层对应的频域基向量的数量， i取值为1至R，

表示从N₃个频域基向量中取出M_i个频域基向量的取法的数量。The third indication information includes R field information, and the ith field information in the R field information is used to indicate the index of the frequency domain basis vector corresponding to the ith spatial layer in the first set, so the The number of bits occupied by the i-th field information is

in,

Represents rounding up, M _i is the number of frequency domain basis vectors corresponding to the ith spatial layer, and i ranges from 1 to R,

Indicates the number of ways to extract M _i frequency domain basis vectors from N ₃ frequency domain basis vectors.

Method 2. The third indication information is indicated in the form of a bitmap (bitmap).

The third indication information includes R bitmaps, one bitmap is used to indicate the index of the frequency domain base vector corresponding to one spatial layer in the first set, and the number of bits occupied by the R bitmaps is N ₃ . For example, for the ith bitmap (corresponding to the ith spatial layer), when the jth bit of the bitmap is 1, it means that the frequency domain basis vector corresponding to the ith spatial layer includes the first The jth frequency domain basis vector in the set, the jth frequency domain basis vector is the frequency domain basis vector corresponding to the jth bit of the bitmap.

In the following, different solutions of the above-mentioned first indication information, second indication information and third indication information will be explained with reference to a specific example.

As shown in FIG. 2B , it is an example diagram of the index reporting of the frequency domain basis vector provided by the present application. Assuming that the space-frequency compression codebook supports a maximum number of spatial layers of 4, the spatial-domain beam basis vectors corresponding to each spatial layer use the same frequency-domain basis vectors, and each spatial layer independently selects the corresponding frequency-domain basis vectors. For the ith spatial layer (1<=i<=4), the corresponding number of frequency domain basis vectors is M _i , and the M _i frequency domain basis vectors are N _f frequency domain basis vectors from the candidate frequency domain basis vector set selected from the basis vectors.

As shown in FIG. 2B , the set of candidate frequency domain basis vectors includes 10 frequency domain basis vectors, and the indices are respectively 0 to 9 (of course, it can also be 1 to 10, which is not limited in this application), ie N _f =10. The number of spatial layers R is equal to 2 (ie, rank=2, that is, RI=2), which are respectively referred to as the first spatial layer and the second spatial layer. The number of frequency domain basis vectors corresponding to each spatial layer is 4, that is, M ₁ =M ₂ =4. The indices of the frequency domain basis vectors corresponding to the first spatial layer in the candidate frequency domain basis vector set are 0, 1, 2, 5, and 8, and the frequency domain basis vectors corresponding to the second spatial layer are in the candidate frequency domain basis vector set. The indices in are 1, 2, 3, 8, and 9. Therefore, the union of the frequency-domain basis vectors corresponding to the first spatial layer and the frequency-domain basis vectors corresponding to the second spatial layer is the index in the set of candidate frequency-domain basis vectors are the frequency domain basis vectors of 0, 1, 2, 3, 5, 8, and 9.

As an example, if starting from the index 8 in the union, the frequency domain basis vectors with continuous index cycles are searched to form the first set, the specific search method is: starting from the frequency domain basis vector corresponding to index 8, the next The frequency domain base vector corresponding to index 9, then the next frequency domain base vector corresponding to index 0, then the next frequency domain base vector corresponding to index 1, then the next frequency domain base vector corresponding to index 2, and then the next One is the frequency domain base vector corresponding to index 3, then the next one is the frequency domain base vector corresponding to index 4, and the next one is the frequency domain base vector corresponding to index 5. At this time, since all the frequency domain base vectors in the above union have been combined The vectors are all searched, so after the search is completed, the obtained first set includes: the frequency domain basis vectors with indexes 8, 9, 0, 1, 2, 3, 4, and 5 in the candidate frequency domain basis vector set, where , the frequency domain basis vector corresponding to index 8 is the first frequency domain basis vector in the first set, and the index 8 is referred to as the initial index corresponding to the first set. The first set can be understood as a cyclic window, and by indicating the start position of the window and the length of the window, the frequency domain basis vector contained in the window can be determined.

Of course, the search can also start from the frequency domain basis vector corresponding to index 5, and the obtained first set includes: the indexes in the candidate frequency domain basis vector set are 5, 6, 7, 8, 9, 10, 0, 1, The frequency domain basis vectors of 2 and 3, wherein the frequency domain basis vector corresponding to index 5 is the first frequency domain basis vector in the first set, and the index 5 is referred to as the initial index corresponding to the first set.

For another example, it is also possible to start the search from the frequency domain basis vector corresponding to index 0, and the obtained first set includes: the indexes in the candidate frequency domain basis vector set are 0, 1, 2, 3, 4, 5, 6, 7 , 8, and 9 frequency domain basis vectors, wherein the frequency domain basis vector corresponding to index 0 is the first frequency domain basis vector in the first set, and index 0 is called the initial index corresponding to the first set.

The present application does not limit the above-mentioned method for determining the first set. As an implementation method, the method that minimizes the number of candidate basis vectors in the first set among all the search methods can be determined to determine the first set. Based on this method, it can be determined that the first set includes: frequency domain basis vectors with indexes 8, 9, 0, 1, 2, 3, 4, and 5 in the candidate frequency domain basis vector set, wherein the frequency domain corresponding to index 8 The basis vector is the first frequency domain basis vector in the first set, and the index 8 is called the initial index corresponding to the first set.

To sum up, based on the embodiment of FIG. 2B , the candidate basis vector set={0, 1, 2, 3, 4, 5, 6, 7, 8, 9}, N _f =10, the corresponding The index of the frequency-domain basis vector in the candidate frequency-domain basis vector set is {0, 1, 2, 5, 8}, and the index of the frequency-domain basis vector corresponding to the second spatial layer in the candidate frequency-domain basis vector set is {1 , 2, 3, 8, 9}, union={0, 1, 2, 3, 5, 8, 9}, X=7, M1 ₌ 4, _M2 =4, first set={8, 9, 0, 1, 2, 3, 4, 5}, N ₃ =8.

It should be noted that the union = {0, 1, 2, 3, 5, 8, 9} here refers to the corresponding indices of 0, 1, 2, 3, 5, 8, and 9 in the candidate basis vector set. The frequency domain basis vector of . That is, there is a one-to-one correspondence between the index and the frequency domain basis vector.

Similarly, the first set = {8, 9, 0, 1, 2, 3, 4, 5} refers to the index 8, 9, 0, 1, 2, 3, 4, 5 in the candidate basis vector set corresponding to The frequency domain basis vector of .

Based on the above-mentioned design scheme 2 of the present application and the embodiment of FIG. 2B , then:

1. The first instruction information

That is, the number of bits occupied by the first indication information is

个比特，第一指示信息的取值范围为M₁至N_f。Since the overhead of CSI part 1 is a fixed length, and the network device does not know the rank value corresponding to the reported CSI before interpreting the CSI part 1, the first indication information needs to be based on the first set supported by various ranks. The maximum possible value of the number of included frequency domain basis vectors is used as a reference to design the bit length of the first indication information. Specifically, the first indication information needs to include

bits, and the value range of the first indication information is M ₁ to N _f .

For example, if the maximum number of supported spatial layers (ie R ₀ ) is 4, and the number of frequency domain basis vectors corresponding to the first spatial layer is M ₁ =4, since the first set contains at least the first spatial layer Corresponding frequency domain basis vectors, the number of frequency domain basis vectors included in the first set is at least M ₁ =4, and at most N _f =10. Therefore, the value range of the first indication information is 4 to 10, and the first indication information is 3 bits. Based on the example in FIG. 2B , in an implementation manner, the size of the first set N ₃ = the value of the first indication information + M ₁ . Taking FIG. 2B as an example, M ₁ =4, and the size of the first set N ₃ = 8, so the value of the first indication information is 4. Since the number of bits occupied by the first indication information is 3, the value of the first indication information may be represented as 100.

In yet another implementation manner, the corresponding relationship between the value of the first indication information and the size of the first set is predefined. For example, the corresponding relationship can be defined in the form of a table. Taking Fig. 2B as an example, the value range of the first indication information is 4 to 10, so the following table 3 can be predefined (only as an example).

Table 3 Correspondence table between the value of the first indication information and the size of the first set

The value of the first indication information The size of the first set (N₃) 000 4 001 5 010 6 011 7 100 8 101 9 110 10

Therefore, for the specific example of FIG. 2B , when the size of the first set N ₃ =8, the value of the first indication information is 100.

2. Second instruction information

个比特，该4个比特用于指示第一集合中的 所述第一个频域基向量在所述候选频域基向量集合中的索引，即指示第一集合的起始频域 基向量索引。如2B实施例所示，该4个比特指示第一集合中的所述第一个频域基向量对应 的索引为8。根据第一指示信息指示的第一集合包含N₃＝8个频域基向量以及第二指示信息 指示的所述第一个频域基向量对应的索引为8，可以确定该第一集合包含的频域基向量索引 为：8、9、0、1、2、3、4、5，即第一集合＝{8、9、0、1、2、3、4、5}。Based on FIG. 2B , the second indication information includes

bits, the 4 bits are used to indicate the index of the first frequency-domain basis vector in the first set in the candidate frequency-domain basis vector set, that is, indicating the index of the starting frequency-domain basis vector of the first set . As shown in Embodiment 2B, the 4 bits indicate that the index corresponding to the first frequency-domain basis vector in the first set is 8. According to the fact that the first set indicated by the first indication information includes N ₃ =8 frequency-domain basis vectors and the index corresponding to the first frequency-domain basis vector indicated by the second indication information is 8, it can be determined that the first set includes The frequency domain basis vector indices are: 8, 9, 0, 1, 2, 3, 4, 5, that is, the first set={8, 9, 0, 1, 2, 3, 4, 5}.

3. The third instruction information

Method 1. The third indication information is indicated in the form of a combination number

Based on FIG. 2B , the third indication information includes two fields of information, wherein the first field information is used to indicate the index of the frequency domain basis vector corresponding to the first spatial layer in the first set, so the first field The information indication is: 2, 3, 4, 7, 0 (in an implementation manner, the index may also be 0, 2, 3, 4, 7 in the order from small to large), that is, it indicates the first set {8 , 9, 0, 1, 2, 3, 4, 5} the 2nd, 3rd, 4th, 7th and 0th indices are the corresponding frequency domain basis vectors of the first spatial layer in the candidate Index into the set of frequency-domain basis vectors. That is to say, the first field information indicates that the frequency domain base vector corresponding to the first spatial layer is the frequency domain base vector with indexes 0, 1, 2, 5, and 8 included in the first set. Alternatively, it can be understood that the first field information indicates which frequency-domain basis vectors in the first set above are the frequency-domain basis vectors corresponding to the first spatial layer. Among them, the number of bits occupied by the first field information is

Similarly, the second field information is used to indicate the index of the frequency domain basis vector corresponding to the second spatial layer in the first set, so the second field information indicates: 3, 4, 5, 0, 1 (In an implementation manner, the index may also be 0, 1, 3, 4, 5 in ascending order), that is, it indicates the first set {8, 9, 0, 1, 2, 3, 4, The 3rd, 4th, 5th, 0th and 1st indices in 5} are the indices of the corresponding frequency-domain basis vectors of the second spatial layer in the set of candidate frequency-domain basis vectors. That is to say, the second field information indicates that the frequency-domain basis vectors corresponding to the second spatial layer are frequency-domain basis vectors with indexes 1, 2, 3, 8, and 9 included in the first set. Alternatively, it can be understood that the second field information indicates which frequency-domain basis vectors in the first set above are the frequency-domain basis vectors corresponding to the second spatial layer. Among them, the number of bits occupied by the second field information is

Method 2. The third indication information is indicated in the form of a bitmap (bitmap)

Based on FIG. 2B , the second indication information includes two bitmaps, which are called the first bitmap and the second bitmap respectively, wherein the first bitmap and the second bitmap are both 8 bits.

For the first bitmap, each bit of the first bitmap corresponds to an index of a frequency-domain basis vector in the first set, so the first, third, fourth, fifth, and eighth bits of the first bitmap is set to 1 and the remaining bits are set to 0.

For the second bitmap, each bit of the second bitmap corresponds to an index of a frequency-domain basis vector in the first set, so the 1st, 2nd, 4th, 5th, and 6th bits of the second bitmap is set to 1 and the remaining bits are set to 0.

It should be noted that, for this design scheme 2, since the indexes corresponding to the frequency domain basis vectors included in the first set are cyclic, in the specific implementation, the first set can be used for the first set in the order of indices from small to large. The frequency domain basis vectors in the first set can also be sorted according to the order of selecting the frequency domain basis vectors from the candidate frequency domain basis vector set.

Correspondingly, the bitmap needs to be set according to the sorting method of the first set.

The above-mentioned design scheme 2 has the following beneficial effects: this scheme effectively utilizes the feature that the frequency domain basis vectors corresponding to multiple spatial layers have a certain overlap, and introduces a new indication field in both CSI part 1 and CSI part 2. Specifically, by first reporting the first set of frequency-domain basis vectors corresponding to all spatial layers, some unselected vectors in the Nf candidate frequency-domain basis vector sets are excluded, and the size of the candidate frequency-domain basis vector set is further indicated. reduce. Subsequently, it is only necessary to indicate which frequency domain basis vectors in the first set of frequency domain basis vectors the frequency domain basis vectors corresponding to each spatial layer are, thereby reducing the indication overhead.

Design solution 3: The CSI sent by the terminal device to the network device includes the first indication information, the second indication information and the third indication information. The first indication information is used to indicate the size of the intersection formed by the frequency domain basis vectors corresponding to the R spatial layers respectively, and the second indication information is used to indicate that each frequency domain basis vector in the intersection set is in the candidate frequency domain The index in the basis vector set, and the third indication information is used to indicate that the frequency domain basis vectors other than the intersection set among some or all of the frequency domain basis vectors corresponding to the R spatial layers are in the candidate frequency domain basis vectors. The vector set is an index in the set of frequency domain basis vectors excluding the intersection set.

Optionally, the CSI part 1 includes the above-mentioned first indication information, and the CSI part 2 includes the above-mentioned second indication information and third indication information. That is, the solution of the present application first indicates the number of frequency domain basis vectors included in the intersection of frequency domain basis vectors corresponding to all spatial layers through the first indication information of CSI part 1, and further indicates the frequency domain included in the intersection through CSI part 2. The index of the basis vector and which frequency domain basis vector or frequency domain basis vectors in the frequency domain basis vectors corresponding to each spatial layer except the frequency domain basis vectors in the intersection set.

For example, based on the solution of the present application, the first indication information is added to the CSI part 1 shown in Table 1, and the CSI part 1 shown in Table 1"' is obtained.

Table 1"' CSI report (CSI part 1)

Among them, RI is used to indicate the number R of spatial layers.

Specific implementation methods of the above-mentioned first indication information, second indication information and third indication information will be described below.

1. The first instruction information

其中，M_i为第i个空间层对应的频 域基向量的数量，i取值为1至R₀，

表示向上取整，R₀为支持的最大空间层数。The number of bits occupied by the first indication information is

Among them, M _i is the number of frequency domain basis vectors corresponding to the ith spatial layer, and i ranges from 1 to R ₀ ,

Indicates rounded up, and R ₀ is the maximum number of spatial layers supported.

In an implementation method, different spatial layers can be configured with the same number of frequency domain basis vectors.

In another implementation method, different spatial layers can also be configured with different numbers of frequency domain basis vectors, and Mi<=Mj, i>j, where Mi represents the ith spatial layer, and Mj represents the jth spatial layer .

2. Second instruction information

Method 1. The second indication information is indicated in the form of a combination number

其中，Y为所述交集的大小Y为正整数，

表 示向上取整，

表示从N_f个频域基向量中取出Y个频域基向量的取法的数量，N_f为所述候 选基向量集合的大小。The number of bits occupied by the second indication information is

where Y is the size of the intersection and Y is a positive integer,

means round up,

Indicates the number of ways to extract Y frequency domain basis vectors from N _f frequency domain basis vectors, where N _f is the size of the candidate basis vector set.

Method 2. The second indication information is indicated in the form of a bitmap (bitmap)

The second indication information may be a bitmap, and the number of bits occupied by the bitmap is N _f , where N _f is the size of the candidate frequency domain basis vector set. For example, when the i-th bit of the bitmap is 1, it means that the intersection includes the i-th frequency-domain basis vector in the candidate frequency-domain basis vector set, and the i-th frequency-domain basis vector is the same as the bitmap. The frequency domain basis vector corresponding to the ith bit of .

3. The third indication information (wherein, R is greater than or equal to 2)

Method 1. The third indication information is indicated in the form of a combination number

其中，Y为所述交集的大小，Y为正整数，

表示向上取整,M_i为第i个空间 层对应的频域基向量的数量，i取值为1至R，

表示从N_f-Y个频域基向量中取出M_i-Y 个频域基向量的取法的数量，N_f为所述候选频域基向量集合的大小。The third indication information includes R field information, and the ith field information in the R field information is used to indicate the frequency domain basis vectors other than the intersection set in the frequency domain basis vectors corresponding to the ith spatial layer The index in the set of frequency-domain basis vectors except the intersection set from the candidate frequency-domain basis vector set, and the number of bits occupied by the i-th field information is

where Y is the size of the intersection, Y is a positive integer,

Represents rounded up, M _i is the number of frequency domain basis vectors corresponding to the i-th spatial layer, i takes values from 1 to R,

Represents the number of ways to extract M _i -Y frequency domain basis vectors from N _f -Y frequency domain basis vectors, where N _f is the size of the candidate frequency domain basis vector set.

Method 2. The third indication information is indicated in the form of a bitmap (bitmap)

The third indication information includes R bitmaps, and one bitmap is used to indicate that the frequency-domain basis vectors other than the intersection among the frequency-domain basis vectors corresponding to one spatial layer are in the candidate frequency-domain basis vector set The number of bits occupied by the R bit bitmaps is N _f −Y, where N _f is the size of the candidate frequency domain basis vector set, and Y is the size of the intersection.

4. The third indication information (wherein, R=2, this method is a special embodiment when R=2)

Method 1. The third indication information is indicated in the form of a combination number

所述第二字段信息占用的比特数等于

Y为所述交集的大小，Y为正整数，

表示向上取整,M_i为第i个空间层对应 的频域基向量的数量，i取值为1至2，

表示从N_f-Y个频域基向量中取出M₁-Y个频 域基向量的取法的数量，

表示从N_f-M₁个频域基向量中取出M₂-Y个频域基向量的 取法的数量，N_f为所述候选频域基向量集合的大小。The third indication information includes first field information and second field information, where the first field information is used to indicate that the frequency-domain basis vectors other than the intersection among the frequency-domain basis vectors corresponding to the first spatial layer are in the the index in the set of frequency domain basis vectors except the intersection set in the candidate frequency domain basis vector set, and the second field information is used to indicate the frequency domain basis vectors corresponding to the second spatial layer. The index of the frequency-domain basis vectors other than the intersection set in the set of frequency-domain basis vectors other than the frequency-domain basis vectors corresponding to the first spatial layer in the candidate frequency-domain basis vector set; wherein, the The number of bits occupied by the first field information is equal to

The number of bits occupied by the second field information is equal to

Y is the size of the intersection, Y is a positive integer,

Represents rounded up, M _i is the number of frequency domain basis vectors corresponding to the ith spatial layer, i is 1 to 2,

represents the number of ways to extract M ₁ -Y frequency domain basis vectors from N _f -Y frequency domain basis vectors,

Indicates the number of ways to extract M ₂ -Y frequency domain basis vectors from N _f -M ₁ frequency domain basis vectors, where N _f is the size of the candidate frequency domain basis vector set.

Method 2. The third indication information is indicated in the form of a bitmap (bitmap).

The third indication information includes first field information and second field information, the first field information is a first bitmap, and the first field information is used to indicate the frequency domain base vector corresponding to the first spatial layer. The index of the frequency domain basis vectors other than the intersection set in the set of frequency domain basis vectors except the intersection set in the candidate frequency domain basis vector set, and the second field information is used to indicate the second The frequency-domain basis vectors other than the intersection among the frequency-domain basis vectors corresponding to the number of spatial layers are the frequency-domain basis vectors other than the frequency-domain basis vectors corresponding to the first spatial layer in the candidate frequency-domain basis vector set. The index in the set composed of domain basis vectors; wherein, the number of bits occupied by the first bitmap is equal to N _f −Y, and the second bitmap N _f minus the frequency corresponding to the first spatial layer The number of field basis vectors, ie N _f -M ₁ . Y is the size of the intersection, Y is a positive integer, and N _f is the size of the candidate frequency-domain basis vector set.

Wherein, in this design scheme 2, the frequency domain basis vector corresponding to the first spatial layer includes the frequency domain basis vector indicated by the first field information and the frequency domain basis vector in the intersection set, and the second spatial layer The corresponding frequency domain base vector includes the frequency domain base vector indicated by the second field information and the frequency domain base vector in the intersection set.

It should be noted that the above description takes the example that the first field information corresponds to the first spatial layer and the second field information corresponds to the second spatial layer. In practical applications, the first field information may also correspond to the second spatial layer. , the second field information corresponds to the first spatial layer, which is not limited in this application.

It should be noted that when R=2, a special solution of the third indication information is given above, and this solution can further reduce the bit overhead. Therefore, in a specific implementation, when R=2, the third indication information implementation method of the above-mentioned solution 3 may be adopted, or the third indication information implementation method of the above-mentioned solution 4 may be adopted.

In the following, different solutions of the above-mentioned first indication information, second indication information and third indication information will be explained with reference to a specific example.

As shown in FIG. 3 , it is another example diagram of the index reporting of the frequency-domain basis vector provided by the present application. Assuming that the space-frequency compression codebook supports a maximum number of spatial layers of 2, each spatial layer independently selects the corresponding frequency-domain basis vector. For the ith spatial layer (1<=i<=4), the corresponding number of frequency domain basis vectors is M _i , and the M _i frequency domain basis vectors are N _f frequency domain basis vectors from the candidate frequency domain basis vector set selected from the basis vectors.

As shown in FIG. 3 , the set of candidate frequency-domain basis vectors includes 10 frequency-domain basis vectors, and the indices are respectively 1 to 10 (of course, it can also be 0 to 9, which is not limited in this application), that is, N _f =10. The number of spatial layers R is equal to 2 (ie, rank=2, that is, RI=2), which are respectively referred to as the first spatial layer and the second spatial layer. The indices of the frequency domain basis vectors corresponding to the first spatial layer in the candidate frequency domain basis vector set are 1, 2, 3, 8, and 9, and the frequency domain basis vectors corresponding to the second spatial layer are in the candidate frequency domain basis vector set. The indices in , are 2, 3, 4, 9, and 10. Therefore, the intersection of the frequency-domain basis vectors corresponding to the first spatial layer and the frequency-domain basis vectors corresponding to the second spatial layer is the index in the candidate frequency-domain basis vector set: Frequency domain basis vectors for 2, 3, and 9.

To sum up, based on the embodiment in FIG. 3 , the candidate basis vector set = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}, N _f =10, the corresponding The index of the frequency domain basis vector in the candidate frequency domain basis vector set is {1, 2, 3, 8, 9}, and the index of the frequency domain basis vector corresponding to the second spatial layer in the candidate frequency domain basis vector set is {2 , 3, 4, 9, 10}, intersection={2, 3, 9}, Y=3, M ₁ =5, M ₂ =5.

Based on the above-mentioned design scheme 3 of the present application and the embodiment of Fig. 3, then:

1. The first instruction information

个比特。若支持的最大空间层数目为2，2个空间层对应的频域基向量的最大数目分别为5/5，则2 个空间对应的频域基向量所构成的交集中包含的频域基向量数目可选值为0-5，共计6种可能。因此，第一指示信息需要包含3比特。基于图3示例，该3比特具体指示数量为3(即 交集的大小)。Since the overhead of CSI part 1 is a fixed length, and the network device does not know the rank value corresponding to the reported CSI before interpreting part 1, the first indication information needs to be based on the maximum possible value of Y supported. Design the bit length of the indication information. Specifically, the first indication information includes

bits. If the maximum number of supported spatial layers is 2, and the maximum number of frequency-domain basis vectors corresponding to the two spatial layers is 5/5 respectively, then the frequency-domain basis vectors included in the intersection set formed by the frequency-domain basis vectors corresponding to the two spatial layers The optional value of the number is 0-5, a total of 6 possibilities. Therefore, the first indication information needs to contain 3 bits. Based on the example in FIG. 3 , the 3 bits specifically indicate that the number is 3 (ie, the size of the intersection).

2. Second instruction information

Method 1. The second indication information is indicated in the form of a combination number

个比 特。Based on FIG. 3 , the second indication information is used to indicate the indices of Y=3 frequency domain basis vectors included in the frequency domain basis vector intersection, that is, 2, 3, and 9. The second indication information needs to indicate which 3 vectors among the N _f =10 frequency domain basis vectors are indexed by the Y=3 frequency domain basis vectors included in the frequency domain basis vector intersection. Therefore, the second indication information only contains

bits.

Method 2. The second indication information is indicated in the form of a bitmap (bitmap).

Based on Fig. 3, the second indication information is a bitmap containing 10 bits, and each bit of the bitmap corresponds to an index of a candidate frequency domain base vector in the candidate frequency domain base vector set. Therefore, bits 2, 3, and 9 of the bitmap are set to 1, and the remaining bits are set to 0.

3. The third instruction information

Method 1. The third indication information is indicated in the form of a combination number

Based on FIG. 3 , the third indication information includes 2 fields of information, wherein the first field information is used to indicate the frequency-domain basis vectors other than the intersection set in the frequency-domain basis vectors corresponding to the first spatial layer (that is, The indices are 1 and 8) in the set of frequency-domain basis vectors (ie, the set {1, 4, 5, 6, 7, 8, 10}) consisting of frequency-domain basis vectors other than the intersection set from the candidate frequency-domain basis vector set index, therefore, the first field information is indicated as: 1 and 6, which indicates the first and sixth indexes in the set {1, 4, 5, 6, 7, 8, 10}, which are the first space The layer corresponds to an index of the frequency domain basis vectors other than the intersection set in the frequency domain base vectors of the candidate frequency domain base vector set in the set formed by the frequency domain base vectors other than the intersection set. Alternatively, it can be understood that the first field information indicates the frequency domain basis vectors other than the intersection set in the frequency domain base vectors corresponding to the first spatial layer and the frequency domain base vectors other than the intersection set from the candidate frequency domain base vector set. Which frequency domain basis vectors are in the set of domain basis vectors. Among them, the number of bits occupied by the first field information is

Similarly, the second field information is used to indicate that in the frequency domain basis vectors corresponding to the second spatial layer, the frequency domain basis vectors other than the intersection set (that is, the indices are 4 and 10) are in the candidate frequency domain basis vectors. The vector set is the index in the set formed by the frequency domain basis vectors other than the intersection set (that is, the set {1, 4, 5, 6, 7, 8, 10}). Therefore, the second field information is indicated as: 2 and 7, which indicate the 2nd and 7th indices in the set {1, 4, 5, 6, 7, 8, 10}, are the sum of the intersections in the corresponding frequency domain basis vectors of the second spatial layer The index of the outer frequency domain basis vectors in the set formed by the frequency domain basis vectors other than the intersection set from the candidate frequency domain basis vector set. Alternatively, it can be understood that the second field information indicates the frequency domain basis vectors other than the intersection set in the frequency domain base vectors corresponding to the second spatial layer, and the frequency domain base vectors of the candidate frequency domain base vector set except the intersection set. Which frequency domain basis vectors are in the set of domain basis vectors. Among them, the number of bits occupied by the second field information is

Method 2. The third indication information is indicated in the form of a bitmap (bitmap).

Based on FIG. 3 , the second indication information includes two bitmaps, which are called the first bitmap and the second bitmap respectively, wherein the first bitmap and the second bitmap are both 7 (ie, 10 -3=7) bits.

For the first bitmap, each bit of the first bitmap corresponds to a set of frequency-domain basis vectors other than the intersection set from the candidate frequency-domain basis vector set (ie, the set {1, 4, 5, 6 , 7, 8, 10}) is an index of a frequency-domain basis vector, so the first and sixth bits of the first bitmap are set to 1, and the remaining bits are set to 0.

For the second bitmap, each bit of the second bitmap corresponds to a set of frequency-domain basis vectors other than the intersection set from the candidate frequency-domain basis vector set (that is, the set {1, 4, 5, 6 , 7, 8, 10}) is an index of a frequency domain basis vector, so the 2nd and 7th bits of the second bitmap are set to 1, and the remaining bits are set to 0.

4. The third indication information (wherein, R=2, this method is a special embodiment when R=2)

Method 1. The third indication information is indicated in the form of a combination number

Based on FIG. 3 , the third indication information includes 2 fields of information, wherein the first field information is used to indicate the frequency-domain basis vectors other than the intersection set in the frequency-domain basis vectors corresponding to the first spatial layer (that is, The indices are 1 and 8) in the set of frequency-domain basis vectors (ie, the set {1, 4, 5, 6, 7, 8, 10}) consisting of frequency-domain basis vectors other than the intersection set from the candidate frequency-domain basis vector set index, therefore, the first field information is indicated as: 1 and 6, which indicates the first and sixth indexes in the set {1, 4, 5, 6, 7, 8, 10}, which are the first space The layer corresponds to an index of the frequency domain basis vectors other than the intersection set in the frequency domain base vectors of the candidate frequency domain base vector set in the set formed by the frequency domain base vectors other than the intersection set. Alternatively, it can be understood that the first field information indicates the frequency domain basis vectors other than the intersection set in the frequency domain base vectors corresponding to the first spatial layer and the frequency domain base vectors other than the intersection set from the candidate frequency domain base vector set. Which frequency domain basis vectors are in the set of domain basis vectors. Among them, the number of bits occupied by the first field information is

个比特。Since there are only 2 spatial layers, the frequency domain basis vectors 1, 8 indicated by the first spatial layer must not correspond to the second spatial layer. Therefore, for the 2nd spatial layer, it is only necessary to indicate which 2 of the set of remaining frequency-domain basis vectors (ie, the set {4, 5, 6, 7, 10}) the corresponding frequency-domain basis vectors 4, 10 are vector. Therefore, the indication information indicating the index of the frequency-domain basis vector corresponding to the second spatial layer only needs to contain

bits.

For network devices, through the first field information (indicating indices 1 and 8) and intersection (indicating indices 2, 3, 9), it can be determined that the frequency domain basis vector corresponding to the first spatial layer is {1, 2, 3, 8, 9}, through the second field (indicating index 4, 10) and the intersection (indicating index 2, 3, 9), it is known that the frequency domain basis vector corresponding to the second spatial layer is {2 , 3, 4, 9, 10}.

Method 2. The third indication information is indicated in the form of a bitmap (bitmap).

Based on FIG. 3 , the second indication information includes two bitmaps, which are respectively called the first bitmap and the second bitmap, wherein the first bitmap is 7 (ie 10-3=7) bits, The second bitmap is 5 bits (ie, the size of the candidate frequency-domain basis vectors minus the number of frequency-domain basis vectors corresponding to the first spatial layer, that is, 10-5=5).

For the first bitmap, each bit of the first bitmap corresponds to an index of a frequency-domain basis vector in the set of frequency-domain basis vectors excluding the intersection in the candidate frequency-domain basis vector set, so the Bits 1 and 6 of the first bit bitmap are set to 1, and the remaining bits are set to 0.

For the second bitmap, each bit of the second bitmap corresponds to a set of frequency-domain basis vectors other than the frequency-domain basis vectors corresponding to the first spatial layer in the candidate frequency-domain basis vector set (that is, The index of a frequency-domain basis vector in the set {4, 5, 6, 7, 10}), so the first and fifth bits of the first bitmap (ie, corresponding to indices 4 and 10) are set to 1, and the remaining bits are set to 1. Set to 0.

The above-mentioned design scheme 3 has the following beneficial effects: this scheme effectively utilizes the feature that the frequency domain basis vectors corresponding to multiple spatial layers have a certain overlap, and introduces a new indication field in both CSI part 1 and CSI part 2. Specifically, by first reporting the intersection of the frequency-domain basis vectors corresponding to all spatial layers, then it is only necessary to indicate the frequency-domain basis vectors corresponding to each spatial layer except the frequency-domain basis vectors included in the frequency-domain basis vector intersection. Therefore, the frequency domain basis vectors corresponding to different spatial layers have certain overlapping characteristics, and the indication overhead is reduced. In addition, for rank=2, the corresponding relationship of only 2 spatial layers is used, that is, the frequency domain basis vectors other than the frequency domain basis vectors included in the frequency domain basis vector intersection set, if they correspond to the spatial layer 1, they must not correspond to in the spatial layer 2, thereby further reducing the indication overhead.

To sum up, the above-mentioned design solutions 1 to 3 of the present application make full use of the same feature of the partial frequency-domain basis vectors of the frequency-domain basis vectors corresponding to each spatial layer, and can further reduce the indication overhead compared with the prior art, Improve the compression efficiency of the compressed codebook. Therefore, in the case of a large number of spatial layers, especially when the frequency domain basis vectors corresponding to multiple spatial layers overlap to a certain extent, the existing indication method has a certain overhead redundancy, and the solution of the present application can solve the problem well. the question.

Based on the above-mentioned various design solutions for the first indication information, the second indication information and the third indication information, the present application provides a communication method, as shown in Figure 4, the method includes the following steps:

Step 401, the terminal device determines the frequency domain basis vectors corresponding to the R spatial layers respectively, where R is an integer greater than 1.

In step 402, the terminal device sends the CSI to the network device, and accordingly, the network device can receive the CSI.

The CSI includes first indication information, second indication information and third indication information. Optionally, the CSI part 1 of the CSI includes the foregoing first indication information, and the CSI part 2 of the CSI includes the foregoing second indication information and third indication information.

For the specific meanings of the first indication information, the second indication information and the third indication information, reference may be made to the descriptions of the foregoing embodiments, and details are not repeated here.

Step 403, the network device determines a precoding matrix according to the CSI.

The foregoing mainly introduces the solution provided by the present application from the perspective of interaction between various network elements. It can be understood that, in order to implement the above-mentioned functions, each network element in the above-mentioned implementation includes corresponding hardware structures and/or software modules for executing each function. Those skilled in the art should easily realize that, in conjunction with the units and algorithm steps of each example described in the embodiments disclosed herein, the present invention can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is performed by hardware or computer software-driven hardware depends on the specific application and design constraints of the technical solution. Skilled artisans may use different methods of implementing the described functionality for each particular application, but such implementations should not be considered beyond the scope of the present invention.

As shown in Fig. 5, which is a possible exemplary block diagram of the communication apparatus involved in the present application, the apparatus 500 may exist in the form of software or hardware. The apparatus 500 may include: a processing unit 502 and a communication unit 503 . As an implementation manner, the communication unit 503 may include a receiving unit and a sending unit. The processing unit 502 is used to control and manage the actions of the device 500. The communication unit 503 is used to support the communication between the apparatus 500 and other network entities. The apparatus 500 may also include a storage unit 501 for storing program codes and data of the apparatus 500.

The processing unit 502 may be a processor or a controller, for example, a general-purpose central processing unit (CPU), general-purpose processor, digital signal processing (digital signal processing, DSP), application specific integrated circuits (application specific integrated circuits) , ASIC), field programmable gate array (FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. It may implement or execute the various exemplary logical blocks, modules and circuits described in connection with this disclosure. The processor may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a DSP and a microprocessor, and the like. The storage unit 501 may be a memory. The communication unit 503 is an interface circuit of the device for receiving signals from other devices. For example, when the device is implemented as a chip, the communication unit 503 is an interface circuit used by the chip to receive signals from other chips or devices, or an interface circuit used by the chip to send signals to other chips or devices.

The apparatus 500 may be the terminal device in any of the foregoing embodiments, and may also be a chip used for the terminal device. For example, when the apparatus 500 is a terminal device, the processing unit 502 may be, for example, a processor, and the communication unit 503 may be, for example, a transceiver. Optionally, the transceiver may include a radio frequency circuit, and the storage unit may be, for example, a memory. For example, when the apparatus 500 is a chip for a terminal device, the processing unit 502 may be, for example, a processor, and the communication unit 503 may be, for example, an input/output interface, a pin or a circuit, and the like. The processing unit 502 can execute computer-executed instructions stored in a storage unit, optionally, the storage unit is a storage unit in the chip, such as a register, a cache, etc., and the storage unit can also be a storage unit in the terminal device located outside the chip storage units, such as read-only memory (ROM) or other types of static storage devices that can store static information and instructions, random access memory (RAM), etc.

In the first embodiment, the apparatus 500 is a terminal device, and the processing unit 502 is configured to determine the frequency domain basis vectors corresponding to the R spatial layers respectively, where R is an integer greater than 1; the communication unit 503 is configured to communicate to the network device Sending channel state information CSI, where the CSI includes first indication information, second indication information and third indication information; wherein the first indication information is used to indicate that the R spatial layers respectively correspond to the frequency domain basis vector composition The size of the union of , the second indication information is used to indicate the index of each frequency-domain basis vector in the union in the candidate frequency-domain basis vector set, and the third indication information is used to indicate the R The indices in the union of some or all of the frequency-domain basis vectors corresponding to the spatial layers respectively.

In a possible implementation method, the CSI includes CSI part 1 and CSI part 2, the CSI part 1 includes the first indication information, and the CSI part 2 includes the second indication information and the first indication information. Three instructions.

其中，R₀为支持的最大空间层数，R小于或等于R₀，N_f为所述候选频域基向量集合的大小， M_i为第i个空间层对应的频域基向量的数量，i取值为1至R₀，

表示向上取整。In a possible implementation method, the number of bits occupied by the first indication information is

Among them, R ₀ is the maximum number of spatial layers supported, R is less than or equal to R ₀ , N _f is the size of the candidate frequency-domain basis vector set, M _i is the number of frequency-domain basis vectors corresponding to the ith spatial layer, i takes values from 1 to R ₀ ,

Indicates rounded up.

其中，R₀为支持的最大空间层数，R小于或等于R₀，N_f为所述候选频域基向量集合的大小，M_i为第i个空间层对应的频域基向量的数量，i取值为1至R₀，

表示向上取整， 所述第一指示信息的取值范围为从M₁到

所述M₁为第1个空间层对应的频域 基向量的数量。In yet another possible implementation method, the number of bits occupied by the first indication information is

Wherein, R ₀ is the maximum number of spatial layers supported, R is less than or equal to R ₀ , N _f is the size of the candidate frequency-domain basis vector set, M _i is the number of frequency-domain basis vectors corresponding to the ith spatial layer, i takes values from 1 to R ₀ ,

Indicates rounding up, and the value range of the first indication information is from M ₁ to

The M ₁ is the number of frequency domain basis vectors corresponding to the first spatial layer.

In a possible implementation method, there is a corresponding relationship between the value of the first indication information and the size of the union. For example, the size of the union=the value of the first indication information+M ₁ , and the minimum value of the value of the first indication information is 0; or, the value of the first indication information and the union The correspondence between the sizes of sets is predefined.

其中，X为所 述并集的大小，X为正整数，

表示向上取整，

表示从N_f个频域基向量中取出X个频域 基向量的取法的数量，N_f为所述候选频域基向量集合的大小。In a possible implementation method, the number of bits occupied by the second indication information is

where X is the size of the union, X is a positive integer,

means round up,

Indicates the number of ways to extract X frequency-domain basis vectors from N _f frequency-domain basis vectors, where N _f is the size of the candidate frequency-domain basis vector set.

In a possible implementation method, the second indication information is a bitmap, and the number of bits occupied by the bitmap is N _f , where N _f is the size of the candidate frequency-domain basis vector set.

其中，X为所述并集的大小，X为正整数，

表示向上取整,M_i为第i个空间层对应的频域基向量的数量，i取值为1至R，

表示从X个 频域基向量中取出M_i个频域基向量的取法的数量。In a possible implementation method, the third indication information includes R field information, and the ith field information in the R field information is used to indicate that the frequency domain basis vector corresponding to the ith spatial layer is in the The index in the union, the number of bits occupied by the i-th field information is

where X is the size of the union, X is a positive integer,

Represents rounded up, M _i is the number of frequency domain basis vectors corresponding to the i-th spatial layer, i takes values from 1 to R,

Indicates the number of ways to extract M _i frequency-domain basis vectors from X frequency-domain basis vectors.

In a possible implementation method, the third indication information includes R bitmaps, where one bitmap is used to indicate an index in the union of a frequency domain basis vector corresponding to one spatial layer, and the R The number of bits occupied by the bitmap is X, where X is the size of the union, and X is a positive integer.

所述第二字段信息占用的比特数等于

X为所述并集的大小，X为正整数，

表示向上取整,M_i为第i个空间层对 应的频域基向量的数量，i取值为1至2，

表示从X个频域基向量中取出M₁个频域基向量 的取法的数量，

表示从M₁个频域基向量中取出M₁+M₂-X个频域基向量的取法的 数量。In a possible implementation method, R=2, the third indication information includes first field information and second field information, and the first field information is used to indicate the frequency domain basis vector corresponding to the first spatial layer The index in the union, the second field information is used to indicate the frequency domain basis vector in the intersection of the frequency domain basis vector corresponding to the first spatial layer and the frequency domain basis vector corresponding to the second spatial layer The index in the frequency domain base vector corresponding to the first spatial layer; wherein, the number of bits occupied by the first field information is equal to

The number of bits occupied by the second field information is equal to

X is the size of the union, X is a positive integer,

Represents rounded up, M _i is the number of frequency domain basis vectors corresponding to the ith spatial layer, i is 1 to 2,

Indicates the number of ways to extract M ₁ frequency domain basis vectors from X frequency domain basis vectors,

Indicates the number of ways to extract M ₁ +M ₂ -X frequency-domain basis vectors from M ₁ frequency-domain basis vectors.

In a possible implementation method, R=2, the third indication information includes first field information and second field information, the first field information is a first bitmap, and the first bitmap used to indicate the index of the frequency domain basis vector corresponding to the first spatial layer in the union, the second field information is a second bitmap, and the second bitmap is used to indicate the first The index of the frequency domain basis vector in the intersection of the frequency domain basis vector corresponding to the spatial layer and the frequency domain basis vector corresponding to the second spatial layer in the frequency domain basis vector corresponding to the first spatial layer; wherein, the The number of bits occupied by the first bitmap is X, X is the size of the union, X is a positive integer, and the number of bits occupied by the second bitmap is the frequency domain base corresponding to the first spatial layer the number of vectors.

In a possible implementation method, the frequency domain basis vector corresponding to the second spatial layer includes the frequency domain basis vector indicated by the second field information and the frequency domain basis vector indicated by the first field information removed from the union. Frequency domain basis vectors other than domain basis vectors.

In the second embodiment, the apparatus 500 is a terminal device, and the processing unit 502 is configured to determine the frequency domain basis vectors corresponding to the R spatial layers respectively, where R is an integer greater than 1; the communication unit 503 is configured to communicate to the network device Sending channel state information CSI, where the CSI includes first indication information, second indication information and third indication information; wherein the first indication information is used to indicate that the R spatial layers respectively correspond to the frequency domain basis vector composition The size of the intersection set, the second indication information is used to indicate the index of each frequency domain basis vector in the intersection set in the candidate frequency domain basis vector set, and the third indication information is used to indicate the R space the index of the frequency domain basis vectors other than the intersection set in some or all of the frequency domain base vectors corresponding to the layers respectively in the set formed by the candidate frequency domain base vector set except the frequency domain base vectors except the intersection set .

In a possible implementation method, the CSI includes CSI part 1 and CSI part 2, the CSI part 1 includes the first indication information, and the CSI part 2 includes the second indication information and the first indication information. Three instructions.

其 中，M_i为第i个空间层对应的频域基向量的数量，i取值为1至R₀，

表示向上取整，R₀为 支持的最大空间层数。In a possible implementation method, the number of bits occupied by the first indication information is

Among them, M _i is the number of frequency domain basis vectors corresponding to the ith spatial layer, and i ranges from 1 to R ₀ ,

Indicates rounded up, and R ₀ is the maximum number of spatial layers supported.

其中，Y为所 述交集的大小Y为正整数，

表示向上取整，

表示从N_f个频域基向量中取出Y个频域基 向量的取法的数量，N_f为所述候选基向量集合的大小。In a possible implementation method, the number of bits occupied by the second indication information is

where Y is the size of the intersection and Y is a positive integer,

means round up,

Indicates the number of ways to extract Y frequency domain basis vectors from N _f frequency domain basis vectors, where N _f is the size of the candidate basis vector set.

In a possible implementation method, the second indication information is a bitmap, and the number of bits occupied by the bitmap is N _f , where N _f is the size of the candidate frequency-domain basis vector set.

其中，Y为所述交集的大小，Y为正整数，

表示向上取整,M_i为第i个空间层对应的频域基向量的数量，i取值为1至R，

表示 从N_f-Y个频域基向量中取出M_i-Y个频域基向量的取法的数量，N_f为所述候选频域基向量集合的大小。In a possible implementation method, the third indication information includes R field information, and the ith field information in the R field information is used to indicate the frequency domain basis vector corresponding to the ith spatial layer. The index of the frequency domain basis vectors other than the intersection set in the set formed by the frequency domain basis vectors other than the intersection set from the candidate frequency domain base vector set, and the number of bits occupied by the i-th field information is:

where Y is the size of the intersection, Y is a positive integer,

Represents rounded up, M _i is the number of frequency domain basis vectors corresponding to the i-th spatial layer, i takes values from 1 to R,

Indicates the number of ways to extract M _i -Y frequency domain basis vectors from N _f -Y frequency domain basis vectors, where N _f is the size of the candidate frequency domain basis vector set.

In a possible implementation method, the third indication information includes R bitmaps, and one bitmap is used to indicate the frequency domain basis except the intersection set in the frequency domain basis vector corresponding to one spatial layer The index of the vector in the candidate frequency domain base vector set, the number of bits occupied by the R bitmaps are all N _f -Y, where N _f is the size of the candidate frequency domain base vector set, and Y is the The size of the intersection.

所述 第二字段信息占用的比特数等于

Y为所述交集的大小，Y为正整数，

表示向 上取整,M_i为第i个空间层对应的频域基向量的数量，i取值为1至2，

表示从N_f-Y个 频域基向量中取出M₁-Y个频域基向量的取法的数量，

表示从N_f-M₁个频域基向量 中取出M₂-Y个频域基向量的取法的数量，N_f为所述候选频域基向量集合的大小。In a possible implementation method, R=2, the third indication information includes first field information and second field information, and the first field information is used to indicate the frequency domain basis vector corresponding to the first spatial layer The index of the frequency-domain basis vectors other than the intersection in the candidate frequency-domain basis vector set in the set formed by the frequency-domain basis vectors except the intersection, and the second field information is used to indicate In the frequency-domain basis vectors corresponding to the second spatial layer, the frequency-domain basis vectors other than the intersection are excluded from the frequency-domain basis vectors corresponding to the first spatial layer in the candidate frequency-domain basis vector set The index in the set formed by the frequency domain basis vectors of ; wherein, the number of bits occupied by the first field information is equal to

The number of bits occupied by the second field information is equal to

Y is the size of the intersection, Y is a positive integer,

Represents rounded up, M _i is the number of frequency domain basis vectors corresponding to the ith spatial layer, i is 1 to 2,

represents the number of ways to extract M ₁ -Y frequency domain basis vectors from N _f -Y frequency domain basis vectors,

Indicates the number of ways to extract M ₂ -Y frequency domain basis vectors from N _f -M ₁ frequency domain basis vectors, where N _f is the size of the candidate frequency domain basis vector set.

In a possible implementation method, R=2, the third indication information includes first field information and second field information, the first field information is a first bitmap, and the first field information uses A set consisting of frequency domain basis vectors other than the intersection set in the frequency domain base vectors indicating the first spatial layer corresponding to the frequency domain base vectors except the intersection set in the candidate frequency domain base vector set The second field information is used to indicate that the frequency domain basis vectors other than the intersection set in the frequency domain basis vectors corresponding to the second spatial layer are excluded from the candidate frequency domain basis vector set. The index in the set formed by the frequency domain basis vectors other than the frequency domain basis vectors corresponding to the first spatial layer; wherein, the number of bits occupied by the first bitmap is equal to Nf-Y, and the second bitmap Nf minus the number of frequency domain basis vectors corresponding to the first spatial layer, Y is the size of the intersection, Y is a positive integer, and N _f is the size of the candidate frequency domain basis vector set.

In a possible implementation method, the frequency domain basis vector corresponding to the first spatial layer includes the frequency domain basis vector indicated by the first field information and the frequency domain basis vector in the intersection set, and the second The frequency-domain basis vectors corresponding to the spatial layers include the frequency-domain basis vectors indicated by the second field information and the frequency-domain basis vectors in the intersection set.

In the third embodiment, the processing unit 502 is configured to determine the frequency domain basis vectors corresponding to the R spatial layers respectively, where R is an integer greater than or equal to 1; the communication unit 503 is configured to send the channel state information CSI to the network device , the CSI includes first indication information, second indication information and third indication information; wherein, the first indication information is used to indicate the size of the first set, and the first set includes the candidate frequency domain basis vector set The index cycle of N ₃ consecutive frequency-domain basis vectors, the N ₃ frequency-domain basis vectors include the union of the frequency-domain basis vectors corresponding to the R spatial layers respectively, the index cycle is continuous N ₃ The first frequency-domain basis vector and the last frequency-domain basis vector in the frequency-domain basis vectors are both frequency-domain basis vectors in the union; the second indication information is used to indicate the The index of the first frequency-domain basis vector in the candidate frequency-domain basis vector set; the third indication information is used to indicate that some or all of the frequency-domain basis vectors corresponding to the R spatial layers are in the first frequency domain basis vector index in the collection.

In a possible implementation method, the CSI includes CSI part 1 and CSI part 2, the CSI part 1 includes the first indication information, and the CSI part 2 includes the second indication information and the first indication information. Three instructions.

其中， N_f为所述候选频域基向量集合的大小，所述M₁为第1个空间层对应的频域基向量的数量，

表示向上取整，所述第一指示信息的取值范围为从M₁到N_f。In a possible implementation method, the number of bits occupied by the first indication information is

Wherein, N _f is the size of the candidate frequency domain basis vector set, and the M ₁ is the number of frequency domain basis vectors corresponding to the first spatial layer,

means rounding up, and the value range of the first indication information is from M ₁ to N _f .

In a possible implementation method, there is a corresponding relationship between the value of the first indication information and the size of the first set.

In a possible implementation method, the size of the first set is equal to the sum of the value of the first indication information and M ₁ , and the minimum value of the value of the first indication information is 0; The corresponding relationship between the value of the indication information and the size of the first set is predefined.

其中，

表示 向上取整，N_f为所述候选频域基向量集合的大小。In a possible implementation method, the number of bits occupied by the second indication information is

in,

represents rounding up, and N _f is the size of the candidate frequency domain basis vector set.

其中，

表示向上取整，M_i为第i个空间层对应的频域基向量的数量，i取值为1至R，

表示从N₃个频域基向量中取出M_i个频域 基向量的取法的数量。In a possible implementation method, the third indication information includes R field information, and the ith field information in the R field information is used to indicate that the frequency domain basis vector corresponding to the ith spatial layer is in the The index in the first set, the number of bits occupied by the i-th field information is

in,

Represents rounding up, M _i is the number of frequency domain basis vectors corresponding to the i-th spatial layer, i takes values from 1 to R,

Indicates the number of ways to extract M _i frequency domain basis vectors from N ₃ frequency domain basis vectors.

In a possible implementation method, the third indication information includes R bitmaps, and one bitmap is used to indicate an index in the first set of a frequency domain basis vector corresponding to one spatial layer, and the The number of bits occupied by the R bitmaps are all N ₃ .

In a possible implementation method, the index of the N ₃ frequency-domain basis vectors is mod(M _initial +n, N _f ), n=0, 1, ..., N ₃ -1, and M _initial represents the is the index of the first frequency-domain basis vector in the first set in the candidate frequency-domain basis vector set, and N _f is the size of the candidate frequency-domain basis vector set.

It can be understood that, for the specific implementation process and the corresponding beneficial effects when the device is used in the above-mentioned communication method, reference may be made to the relevant descriptions in the foregoing method embodiments, and details are not repeated here.

As shown in Fig. 6, which is a possible exemplary block diagram of the communication apparatus involved in the present application, the apparatus 600 may exist in the form of software or hardware. The apparatus 600 may include: a processing unit 602 and a communication unit 603 . As an implementation manner, the communication unit 603 may include a receiving unit and a sending unit. The processing unit 602 is used to control and manage the actions of the device 600. The communication unit 603 is used to support the communication between the apparatus 600 and other network entities. The apparatus 600 may also include a storage unit 601 for storing program codes and data of the apparatus 600.

The processing unit 602 may be a processor or a controller, for example, a CPU, a general-purpose processor, a DSP, an ASIC, an FPGA, or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It may implement or execute the various exemplary logical blocks, modules and circuits described in connection with this disclosure. The processor may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a DSP and a microprocessor, and the like. The storage unit 601 may be a memory. The communication unit 603 is an interface circuit of the device for receiving signals from other devices. For example, when the device is implemented as a chip, the communication unit 603 is an interface circuit used by the chip to receive signals from other chips or devices, or an interface circuit used by the chip to send signals to other chips or devices.

The apparatus 600 may be the network device in any of the foregoing embodiments, and may also be a chip used for the network device. For example, when the apparatus 600 is a network device, the processing unit 602 may be, for example, a processor, and the communication unit 603 may be, for example, a transceiver. Optionally, the transceiver may include a radio frequency circuit, and the storage unit may be, for example, a memory. For example, when the apparatus 600 is a chip for a network device, the processing unit 602 may be, for example, a processor, and the communication unit 603 may be, for example, an input/output interface, a pin or a circuit, and the like. The processing unit 602 can execute computer-executed instructions stored in a storage unit. Optionally, the storage unit is a storage unit in the chip, such as a register, a cache, etc., and the storage unit can also be a network device located outside the chip. A storage unit, such as ROM or other types of static storage devices that can store static information and instructions, RAM, etc.

In the first embodiment, the apparatus 600 is a network device, and the communication unit 603 is configured to receive channel state information CSI from the terminal device, where the CSI includes first indication information, second indication information and third indication information; The first indication information is used to indicate the size of the union formed by the frequency domain basis vectors corresponding to the R spatial layers respectively, and the second indication information is used to indicate each frequency domain basis in the union. the index of the vector in the set of candidate frequency-domain basis vectors, the third indication information is used to indicate the index of some or all of the frequency-domain basis vectors corresponding to the R spatial layers respectively in the union; the processing unit 602, using for determining a precoding matrix according to the CSI.

In a possible implementation method, the CSI includes CSI part 1 and CSI part 2, the CSI part 1 includes the first indication information, and the CSI part 2 includes the second indication information and the first indication information. Three instructions.

其中，R₀为支持的最大空间层数，R小于或等于R₀，N_f为所述候选频域基向量集合的大小， M_i为第i个空间层对应的频域基向量的数量，i取值为1至R₀，

表示向上取整。In a possible implementation method, the number of bits occupied by the first indication information is

Among them, R ₀ is the maximum number of spatial layers supported, R is less than or equal to R ₀ , N _f is the size of the candidate frequency-domain basis vector set, M _i is the number of frequency-domain basis vectors corresponding to the ith spatial layer, i takes values from 1 to R ₀ ,

Indicates rounded up.

其中，R₀为支持的最大空间层数，R小于或等于R₀，N_f为所述候选频域基向量集合 的大小，M_i为第i个空间层对应的频域基向量的数量，i取值为1至R₀，

表示向上取整， 所述第一指示信息的取值范围为从M₁到

所述M₁为第1个空间层对应的频域 基向量的数量。In yet another possible implementation method, the number of bits occupied by the first indication information is

Wherein, R ₀ is the maximum number of spatial layers supported, R is less than or equal to R ₀ , N _f is the size of the candidate frequency-domain basis vector set, M _i is the number of frequency-domain basis vectors corresponding to the ith spatial layer, i takes values from 1 to R ₀ ,

Indicates rounding up, and the value range of the first indication information is from M ₁ to

The M ₁ is the number of frequency domain basis vectors corresponding to the first spatial layer.

In a possible implementation method, there is a corresponding relationship between the value of the first indication information and the size of the union. For example, the size of the union=the value of the first indication information+M ₁ , and the minimum value of the value of the first indication information is 0; or, the value of the first indication information and the union The correspondence between the sizes of sets is predefined.

其中，X为所 述并集的大小，X为正整数，

表示向上取整，

表示从N_f个频域基向量中取出X个频域 基向量的取法的数量，N_f为所述候选频域基向量集合的大小。In a possible implementation method, the number of bits occupied by the second indication information is

where X is the size of the union, X is a positive integer,

means round up,

Indicates the number of ways to extract X frequency-domain basis vectors from N _f frequency-domain basis vectors, where N _f is the size of the candidate frequency-domain basis vector set.

In a possible implementation method, the second indication information is a bitmap, and the number of bits occupied by the bitmap is N _f , where N _f is the size of the candidate frequency-domain basis vector set.

其中，X为所述并集的大小，X为正整数，

表示向上取整,M_i为第i个空间层对应的频域基向量的数量，i取值为1至R，

表示从X个 频域基向量中取出M_i个频域基向量的取法的数量。In a possible implementation method, the third indication information includes R field information, and the ith field information in the R field information is used to indicate that the frequency domain basis vector corresponding to the ith spatial layer is in the The index in the union, the number of bits occupied by the i-th field information is

where X is the size of the union, X is a positive integer,

Represents rounded up, M _i is the number of frequency domain basis vectors corresponding to the i-th spatial layer, i takes values from 1 to R,

Indicates the number of ways to extract M _i frequency-domain basis vectors from X frequency-domain basis vectors.

In a possible implementation method, the third indication information includes R bitmaps, where one bitmap is used to indicate an index in the union of a frequency domain basis vector corresponding to one spatial layer, and the R The number of bits occupied by the bitmap is X, where X is the size of the union, and X is a positive integer.

所述第二字段信息占用的比特数等于

X为所述并集的大小，X为正整数，

表示向上取整,M_i为第i个空间层对 应的频域基向量的数量，i取值为1至2，

表示从X个频域基向量中取出M₁个频域基向量 的取法的数量，

表示从M₁个频域基向量中取出M₁+M₂-X个频域基向量的取法的 数量。In a possible implementation method, R=2, the third indication information includes first field information and second field information, and the first field information is used to indicate the frequency domain basis vector corresponding to the first spatial layer The index in the union, the second field information is used to indicate the frequency domain basis vector in the intersection of the frequency domain basis vector corresponding to the first spatial layer and the frequency domain basis vector corresponding to the second spatial layer The index in the frequency domain base vector corresponding to the first spatial layer; wherein, the number of bits occupied by the first field information is equal to

The number of bits occupied by the second field information is equal to

X is the size of the union, X is a positive integer,

Represents rounded up, M _i is the number of frequency domain basis vectors corresponding to the ith spatial layer, i is 1 to 2,

Indicates the number of ways to extract M ₁ frequency domain basis vectors from X frequency domain basis vectors,

Indicates the number of ways to extract M ₁ +M ₂ -X frequency-domain basis vectors from M ₁ frequency-domain basis vectors.

In a possible implementation method, R=2, the third indication information includes first field information and second field information, the first field information is a first bitmap, and the first bitmap used to indicate the index of the frequency domain basis vector corresponding to the first spatial layer in the union, the second field information is a second bitmap, and the second bitmap is used to indicate the first The index of the frequency domain basis vector in the intersection of the frequency domain basis vector corresponding to the spatial layer and the frequency domain basis vector corresponding to the second spatial layer in the frequency domain basis vector corresponding to the first spatial layer; wherein, the The number of bits occupied by the first bitmap is X, X is the size of the union, X is a positive integer, and the number of bits occupied by the second bitmap is the frequency domain base corresponding to the first spatial layer the number of vectors.

In a possible implementation method, the frequency domain basis vector corresponding to the second spatial layer includes the frequency domain basis vector indicated by the second field information and the frequency domain basis vector indicated by the first field information removed from the union. Frequency domain basis vectors other than domain basis vectors.

In the second embodiment, the apparatus 600 is a network device, and the communication unit 603 is configured to receive channel state information CSI from the terminal device, where the CSI includes first indication information, second indication information and third indication information; The first indication information is used to indicate the size of the intersection formed by the frequency domain basis vectors corresponding to the R spatial layers respectively, and the second indication information is used to indicate each frequency domain basis vector in the intersection set An index in the set of candidate frequency-domain basis vectors, where the third indication information is used to indicate that the frequency-domain basis vectors other than the intersection among some or all of the frequency-domain basis vectors corresponding to the R spatial layers respectively are in The index in the set formed by the frequency domain basis vectors except the intersection set from the candidate frequency domain basis vector set; the processing unit 602 is configured to determine a precoding matrix according to the CSI.

In a possible implementation method, the CSI includes CSI part 1 and CSI part 2, the CSI part 1 includes the first indication information, and the CSI part 2 includes the second indication information and the first indication information. Three instructions.

其 中，M_i为第i个空间层对应的频域基向量的数量，i取值为1至R₀，

表示向上取整，R₀为 支持的最大空间层数。In a possible implementation method, the number of bits occupied by the first indication information is

Among them, M _i is the number of frequency domain basis vectors corresponding to the ith spatial layer, and i ranges from 1 to R ₀ ,

Indicates rounded up, and R ₀ is the maximum number of spatial layers supported.

其中，Y为所 述交集的大小Y为正整数，

表示向上取整，

表示从N_f个频域基向量中取出Y个频域基 向量的取法的数量，N_f为所述候选基向量集合的大小。In a possible implementation method, the number of bits occupied by the second indication information is

where Y is the size of the intersection and Y is a positive integer,

means round up,

Indicates the number of ways to extract Y frequency domain basis vectors from N _f frequency domain basis vectors, where N _f is the size of the candidate basis vector set.

In a possible implementation method, the second indication information is a bitmap, and the number of bits occupied by the bitmap is N _f , where N _f is the size of the candidate frequency-domain basis vector set.

其中，Y为所述交集的大小，Y为正整数，

表示向上取整,M_i为第i个空间层对应的频域基向量的数量，i取值为1至R，

表示 从N_f-Y个频域基向量中取出M_i-Y个频域基向量的取法的数量，N_f为所述候选频域基向量集合的大小。In a possible implementation method, the third indication information includes R field information, and the ith field information in the R field information is used to indicate the frequency domain basis vector corresponding to the ith spatial layer. The index of the frequency domain basis vectors other than the intersection set in the set formed by the frequency domain basis vectors other than the intersection set from the candidate frequency domain base vector set, and the number of bits occupied by the i-th field information is:

where Y is the size of the intersection, Y is a positive integer,

Represents rounded up, M _i is the number of frequency domain basis vectors corresponding to the i-th spatial layer, i takes values from 1 to R,

Indicates the number of ways to extract M _i -Y frequency domain basis vectors from N _f -Y frequency domain basis vectors, where N _f is the size of the candidate frequency domain basis vector set.

In a possible implementation method, the third indication information includes R bitmaps, and one bitmap is used to indicate the frequency domain basis except the intersection set in the frequency domain basis vector corresponding to one spatial layer The index of the vector in the candidate frequency domain base vector set, the number of bits occupied by the R bitmaps are all N _f -Y, where N _f is the size of the candidate frequency domain base vector set, and Y is the The size of the intersection.

所述 第二字段信息占用的比特数等于

Y为所述交集的大小，Y为正整数，

表示向 上取整,M_i为第i个空间层对应的频域基向量的数量，i取值为1至2，

表示从N_f-Y个 频域基向量中取出M₁-Y个频域基向量的取法的数量，

表示从N_f-M₁个频域基向量 中取出M₂-Y个频域基向量的取法的数量，N_f为所述候选频域基向量集合的大小。In a possible implementation method, R=2, the third indication information includes first field information and second field information, and the first field information is used to indicate the frequency domain basis vector corresponding to the first spatial layer The index of the frequency-domain basis vectors other than the intersection in the candidate frequency-domain basis vector set in the set formed by the frequency-domain basis vectors except the intersection, and the second field information is used to indicate In the frequency-domain basis vectors corresponding to the second spatial layer, the frequency-domain basis vectors other than the intersection are excluded from the frequency-domain basis vectors corresponding to the first spatial layer in the candidate frequency-domain basis vector set The index in the set formed by the frequency domain basis vectors of ; wherein, the number of bits occupied by the first field information is equal to

The number of bits occupied by the second field information is equal to

Y is the size of the intersection, Y is a positive integer,

Represents rounded up, M _i is the number of frequency domain basis vectors corresponding to the ith spatial layer, i is 1 to 2,

represents the number of ways to extract M ₁ -Y frequency domain basis vectors from N _f -Y frequency domain basis vectors,

Indicates the number of ways to extract M ₂ -Y frequency domain basis vectors from N _f -M ₁ frequency domain basis vectors, where N _f is the size of the candidate frequency domain basis vector set.

In a possible implementation method, R=2, the third indication information includes first field information and second field information, the first field information is a first bitmap, and the first field information uses A set consisting of frequency domain basis vectors other than the intersection set in the frequency domain base vectors indicating the first spatial layer corresponding to the frequency domain base vectors except the intersection set in the candidate frequency domain base vector set The second field information is used to indicate that the frequency domain basis vectors other than the intersection set in the frequency domain basis vectors corresponding to the second spatial layer are excluded from the candidate frequency domain basis vector set. The index in the set formed by the frequency domain basis vectors other than the frequency domain basis vectors corresponding to the first spatial layer; wherein, the number of bits occupied by the first bitmap is equal to N _f −Y, and the second bit Figure N _f minus the number of frequency domain basis vectors corresponding to the first spatial layer, Y is the size of the intersection, Y is a positive integer, and N _f is the size of the candidate frequency domain basis vector set.

In a possible implementation method, the frequency domain basis vector corresponding to the first spatial layer includes the frequency domain basis vector indicated by the first field information and the frequency domain basis vector in the intersection set, and the second The frequency-domain basis vectors corresponding to the spatial layers include the frequency-domain basis vectors indicated by the second field information and the frequency-domain basis vectors in the intersection set.

In a third embodiment, the communication unit 603 is configured to receive channel state information CSI from a terminal device, where the CSI includes first indication information, second indication information and third indication information; wherein the first indication The information is used to indicate the size of the first set, and the first set includes N ₃ frequency-domain basis vectors with consecutive indices in the candidate frequency-domain basis vector set, and the N ₃ frequency-domain basis vectors include R spatial layers The union formed by the corresponding frequency-domain basis vectors, the first frequency-domain basis vector and the last frequency-domain basis vector in the N ₃ frequency-domain basis vectors that are continuous in the index cycle are both the frequency-domain basis in the union. basis vector; the second indication information is used to indicate the index of the first frequency-domain basis vector in the first set in the candidate frequency-domain basis vector set; the third indication information is used to indicate an index in the first set of some or all frequency domain basis vectors corresponding to the R spatial layers respectively, where R is an integer greater than or equal to 1; the processing unit 602 is configured to determine a precoding matrix according to the CSI .

In a possible implementation method, the CSI includes CSI part 1 and CSI part 2, the CSI part 1 includes the first indication information, and the CSI part 2 includes the second indication information and the first indication information. Three instructions.

其中， N_f为所述候选频域基向量集合的大小，所述M₁为第1个空间层对应的频域基向量的数量，

表示向上取整，所述第一指示信息的取值范围为从M₁到N_f。In a possible implementation method, the number of bits occupied by the first indication information is

Wherein, N _f is the size of the candidate frequency domain basis vector set, and the M ₁ is the number of frequency domain basis vectors corresponding to the first spatial layer,

means rounding up, and the value range of the first indication information is from M ₁ to N _f .

In a possible implementation method, there is a corresponding relationship between the value of the first indication information and the size of the first set.

In a possible implementation method, the size of the first set is equal to the sum of the value of the first indication information and M ₁ , and the minimum value of the value of the first indication information is 0; The corresponding relationship between the value of the indication information and the size of the first set is predefined.

其中，

表示 向上取整，N_f为所述候选频域基向量集合的大小。In a possible implementation method, the number of bits occupied by the second indication information is

in,

represents rounding up, and N _f is the size of the candidate frequency domain basis vector set.

其中，

表示向上取整，M_i为第i个空间层对应的频域基向量的数量，i取值为1至R，

表示从N₃个频域基向量中取出M_i个频域 基向量的取法的数量。In a possible implementation method, the third indication information includes R field information, and the ith field information in the R field information is used to indicate that the frequency domain basis vector corresponding to the ith spatial layer is in the The index in the first set, the number of bits occupied by the i-th field information is

in,

Represents rounding up, M _i is the number of frequency domain basis vectors corresponding to the i-th spatial layer, i takes values from 1 to R,

Indicates the number of ways to extract M _i frequency domain basis vectors from N ₃ frequency domain basis vectors.

In a possible implementation method, the third indication information includes R bitmaps, and one bitmap is used to indicate an index in the first set of a frequency domain basis vector corresponding to one spatial layer, and the The number of bits occupied by the R bitmaps are all N ₃ .

In a possible implementation method, the index of the N ₃ frequency-domain basis vectors is mod(M _initial +n, N _f ), n=0, 1, ..., N ₃ -1, and M _initial represents the is the index of the first frequency-domain basis vector in the first set in the candidate frequency-domain basis vector set, and N _f is the size of the candidate frequency-domain basis vector set.

It can be understood that, for the specific implementation process and the corresponding beneficial effects when the device is used in the above-mentioned communication method, reference may be made to the relevant descriptions in the foregoing method embodiments, and details are not repeated here.

As shown in FIG. 7, a schematic diagram of a communication apparatus provided by the present application, the apparatus may be a terminal device or a network device in the above-mentioned embodiment. The apparatus 700 includes: a processor 702 , a communication interface 703 , and a memory 701 . Optionally, the apparatus 700 may further include a communication line 704 . The communication interface 703, the processor 702 and the memory 701 may be connected to each other through a communication line 704; the communication line 704 may be a peripheral component interconnect (PCI for short) bus or an extended industry standard architecture (extended industry standard architecture, for short) EISA) bus, etc. The communication line 704 can be divided into an address bus, a data bus, a control bus, and the like. For ease of presentation, only one thick line is shown in Figure 7, but it does not mean that there is only one bus or one type of bus.

The processor 702 may be a CPU, microprocessor, ASIC, or one or more integrated circuits for controlling the execution of the programs of the present application.

Communication interface 703, using any transceiver-like device, for communicating with other devices or communication networks, such as Ethernet, radio access network (RAN), wireless local area networks (WLAN), wired access network, etc.

The memory 701 can be a ROM or other types of static storage devices that can store static information and instructions, a RAM or other types of dynamic storage devices that can store information and instructions, or an electrically erasable programmable read-only memory (electrically erasable programmable read-only memory). read-only memory, EEPROM), compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compact disc, laser disc, optical disc, digital versatile disc, Blu-ray disc, etc.), magnetic disk storage A medium or other magnetic storage device, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, without limitation. The memory may exist independently and be connected to the processor through communication line 704 . The memory can also be integrated with the processor.

Wherein, the memory 701 is used for storing the computer-executed instructions for executing the solution of the present application, and the execution is controlled by the processor 702. The processor 702 is configured to execute the computer-executed instructions stored in the memory 701, thereby implementing the communication method provided by the foregoing embodiments of the present application.

Optionally, the computer-executed instructions in the embodiment of the present application may also be referred to as application code, which is not specifically limited in the embodiment of the present application.

Those of ordinary skill in the art can understand that: the first, second, etc. various numerical numbers involved in this application are only for the convenience of description, and are not used to limit the scope of the embodiments of the application, but also represent the sequence. "And/or", which describes the association relationship of the associated objects, means that there can be three kinds of relationships, for example, A and/or B, which can mean that A exists alone, A and B exist at the same time, and B exists alone. The character "/" generally indicates that the related objects are an "or" relationship. "At least one" means one or more. At least two means two or more. "At least one", "any one", or similar expressions, refer to any combination of these items, including any combination of single item(s) or plural item(s). For example, at least one item (single, species) of a, b, or c can represent: a, b, c, a-b, a-c, b-c, or a-b-c, where a, b, c can be single or multiple. "Plural" means two or more, and other quantifiers are similar. Furthermore, occurrences of the singular forms "a", "an" and "the" do not mean "one or only one" unless the context clearly dictates otherwise, but rather "one or more" in one". For example, "a device" means to one or more of such devices.

In the above-mentioned embodiments, it may be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented in software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present application are generated. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable device. The computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be downloaded from a website site, computer, server, or data center Transmission to another website site, computer, server, or data center is by wire (eg, coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (eg, infrared, wireless, microwave, etc.). The computer-readable storage medium may be any available medium that a computer can access, or a data storage device such as a server, a data center, or the like that includes an integration of one or more available media. The usable media may be magnetic media (eg, floppy disks, hard disks, magnetic tapes), optical media (eg, DVD), or semiconductor media (eg, Solid State Disk (SSD)), and the like.

The various illustrative logic units and circuits described in the embodiments of this application may be implemented by general purpose processors, digital signal processors, application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs) or other programmable logic devices, Discrete gate or transistor logic, discrete hardware components, or any combination of the above are designed to implement or operate the described functions. A general-purpose processor may be a microprocessor, and alternatively, the general-purpose processor may be any conventional processor, controller, microcontroller, or state machine. A processor may also be implemented by a combination of computing devices, such as a digital signal processor and a microprocessor, multiple microprocessors, one or more microprocessors in combination with a digital signal processor core, or any other similar configuration. accomplish.

The steps of the method or algorithm described in the embodiments of the present application may be directly embedded in hardware, a software unit executed by a processor, or a combination of the two. A software unit may be stored in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art. Illustratively, a storage medium can be coupled to the processor such that the processor can read information from, and write information to, the storage medium. Optionally, the storage medium can also be integrated into the processor. The processor and storage medium may be provided in the ASIC.

These computer program instructions can also be loaded on a computer or other programmable data processing device to cause a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process such that The instructions provide steps for implementing the functions specified in the flow or blocks of the flowcharts and/or the block or blocks of the block diagrams.

Although the application has been described in conjunction with specific features and embodiments thereof, it will be apparent that various modifications and combinations can be made therein without departing from the spirit and scope of the application. Accordingly, this specification and drawings are merely exemplary illustrations of the application as defined by the appended claims, and are deemed to cover any and all modifications, variations, combinations or equivalents within the scope of this application. Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims (132)

1. A method of communication, comprising:

the terminal equipment determines frequency domain basis vectors corresponding to R spatial layers respectively, wherein R is an integer larger than 1;

the terminal equipment sends Channel State Information (CSI) to network equipment, wherein the CSI comprises first indication information, second indication information and third indication information;

the first indication information is used to indicate the size of a union set formed by frequency domain basis vectors corresponding to the R spatial layers, the second indication information is used to indicate the index of each frequency domain basis vector in the union set in a candidate frequency domain basis vector set, and the third indication information is used to indicate the index of part or all of the frequency domain basis vectors corresponding to the R spatial layers in the union set.

2. The method of claim 1, wherein the CSI comprises CSI-part 1 and CSI-part 2, the CSI-part 1 comprising the first indication information, the CSI-part 2 comprising the second indication information and the third indication information.

3. The method of claim 1, wherein the first indication information occupies a number of bits

Wherein R is₀For the maximum number of spatial layers supported, R is less than or equal to R ₀，N_fIs the size of the set of candidate frequency domain basis vectors, M_iFor the number of frequency domain basis vectors corresponding to the ith spatial layer, i takes a value from 1 to R₀，

Indicating rounding up.

4. The method of claim 1, wherein the first indication information occupies a number of bits

Wherein R is₀For the maximum number of spatial layers supported, R is less than or equal to R₀，N_fIs the size of the set of candidate frequency domain basis vectors, M_iFor the number of frequency domain basis vectors corresponding to the ith spatial layer, i takes a value from 1 to R₀，

The value range of the first indication information is from M₁To

The M is₁The number of frequency domain basis vectors corresponding to the 1 st spatial layer.

5. The method of claim 4, wherein there is a correspondence between a value of the first indication information and a size of the union.

6. The method of claim 5, wherein the size of the union is equal to the value of the first indication information and M₁The minimum value of the first indication information is 0; or,

the correspondence between the value of the first indication information and the size of the union is predefined.

7. The method according to any of claims 1-6, wherein the second indication information occupies a number of bits of

Wherein X is the size of the union, X is a positive integer,

which means that the rounding is made up,

represents from N_fThe number of the extraction methods for extracting X frequency domain basis vectors from the frequency domain basis vectors, N_fIs the size of the set of candidate frequency domain basis vectors.

8. The method according to any of claims 1-6, wherein the second indication information is a bitmap, the bitmap having N bits_fWherein N is_fIs the size of the set of candidate frequency domain basis vectors.

9. The method of any one of claims 1-6, wherein the third indication information includes R field information, an ith field information of the R field information being used to indicate an index of the frequency-domain basis vectors corresponding to the ith spatial layer in the union, and the ith field information occupying the number of bits being

Wherein X is the size of the union, X is a positive integer,

denotes rounding up, M_iTaking the value of i for the number of frequency domain basis vectors corresponding to the ith spatial layerIs a group of 1 to R,

representing M taken from X frequency-domain basis vectors_iThe number of the frequency domain basis vector acquisitions.

10. The method according to any of claims 1-6, wherein the third indication information includes R bitmaps, one bitmap is used to indicate indexes of frequency-domain basis vectors corresponding to one spatial layer in the union, the R bitmaps all occupy X bits, X is the size of the union, and X is a positive integer.

11. The method according to any one of claims 1-6, wherein R is 2, and the third indication information includes first field information and second field information, the first field information indicating an index of a frequency-domain basis vector corresponding to a first spatial layer in the union, and the second field information indicating an index of a frequency-domain basis vector in an intersection of the frequency-domain basis vector corresponding to the first spatial layer and a frequency-domain basis vector corresponding to a second spatial layer in the frequency-domain basis vector corresponding to the first spatial layer;

wherein the number of bits occupied by the first field information is equal to

The number of bits occupied by the second field information is equal to

X is the size of the union, X is a positive integer,

denotes rounding up, M_iI is the number of frequency domain basis vectors corresponding to the ith spatial layer, i is 1 to 2,

representing M taken from X frequency-domain basis vectors₁The number of the frequency domain basis vector acquisitions,

represents from M₁Taking out M from frequency domain basis vector₁+M₂The number of the X frequency domain basis vector acquisitions.

12. The method of claim 11, wherein the frequency-domain basis vectors corresponding to the second spatial layer comprise the frequency-domain basis vectors indicated by the second field information and the frequency-domain basis vectors except for the frequency-domain basis vectors indicated by the merged first field information.

13. The method according to any one of claims 1-6, wherein R is 2, the third indication information includes a first field information and a second field information, the first field information is a first bitmap, the first bitmap is used for indicating indexes of the frequency-domain basis vectors corresponding to the first spatial layer in the union, and the second field information is a second bitmap, the second bitmap is used for indicating indexes of the frequency-domain basis vectors in the intersection of the frequency-domain basis vectors corresponding to the first spatial layer and the frequency-domain basis vectors corresponding to the second spatial layer in the frequency-domain basis vectors corresponding to the first spatial layer;

the number of bits occupied by the first bitmap is X, X is the size of the union set, X is a positive integer, and the number of bits occupied by the second bitmap is the number of frequency domain basis vectors corresponding to the first spatial layer.

14. The method of claim 13, wherein the frequency-domain basis vectors corresponding to the second spatial layer comprise the frequency-domain basis vectors indicated by the second field information and the frequency-domain basis vectors except for the frequency-domain basis vectors indicated by the merged first field information.

15. A method of communication, comprising:

the method comprises the steps that the network equipment receives Channel State Information (CSI) from the terminal equipment, wherein the CSI comprises first indication information, second indication information and third indication information; the first indication information is used for indicating the size of a union set formed by frequency domain basis vectors corresponding to R spatial layers respectively, the second indication information is used for indicating the index of each frequency domain basis vector in the union set in a candidate frequency domain basis vector set, the third indication information is used for indicating the index of partial or all frequency domain basis vectors corresponding to the R spatial layers respectively in the union set, and R is an integer greater than 1;

and the network equipment determines a precoding matrix according to the CSI.

16. The method of claim 15, wherein the CSI comprises CSI-part 1 and CSI-part 2, wherein the CSI-part 1 comprises the first indication information, and wherein the CSI-part 2 comprises the second indication information and the third indication information.

17. The method of claim 15, wherein the first indication information occupies a number of bits

Wherein R is₀For the maximum number of spatial layers supported, R is less than or equal to R ₀，N_fIs the size of the set of candidate frequency domain basis vectors, M_iFor the number of frequency domain basis vectors corresponding to the ith spatial layer, i takes a value from 1 to R₀，

Indicating rounding up.

18. The method of claim 15, wherein the first indication information occupies a number of bits

Wherein R is₀For the maximum number of spatial layers supported, R is less than or equal to R₀，N_fIs the size of the set of candidate frequency domain basis vectors, M_iFor the number of frequency domain basis vectors corresponding to the ith spatial layer, i takes a value from 1 to R₀，

The value range of the first indication information is from M₁To

The M is₁The number of frequency domain basis vectors corresponding to the 1 st spatial layer.

19. The method of claim 18, wherein there is a correspondence between a value of the first indication information and a size of the union.

20. The method of claim 19, wherein the size of the union is equal to a value of the first indication information and M₁The minimum value of the first indication information is 0; or,

the correspondence between the value of the first indication information and the size of the union is predefined.

21. The method according to any of claims 15-20, wherein said second indication information occupies a number of bits of

Wherein X is the size of the union, X is a positive integer,

which means that the rounding is made up,

represents from N_fThe number of the extraction methods for extracting X frequency domain basis vectors from the frequency domain basis vectors, N_fIs the size of the set of candidate frequency domain basis vectors.

22. The method according to any of claims 15-20, wherein the second indication information is a bitmap, the bitmap having N bits_fWherein N is_fIs the size of the set of candidate frequency domain basis vectors.

23. The method of any one of claims 15-20, wherein the third indication information includes R field information, an ith field information of the R field information being used to indicate an index of the frequency-domain basis vectors corresponding to the ith spatial layer in the union, and the ith field information occupying the number of bits being

Wherein X is the size of the union, X is a positive integer,

denotes rounding up, M_iI is the number of frequency domain basis vectors corresponding to the ith spatial layer, i is 1 to R,

representing M taken from X frequency-domain basis vectors_iThe number of the frequency domain basis vector acquisitions.

24. The method according to any of claims 15-20, wherein the third indication information includes R bitmaps, one bitmap is used to indicate indexes of frequency-domain basis vectors corresponding to one spatial layer in the union, the R bitmaps all occupy X bits, X is the size of the union, and X is a positive integer.

25. The method according to any one of claims 15-20, wherein R ═ 2, the third indication information includes first field information and second field information, the first field information indicating an index of the frequency-domain basis vectors corresponding to the first spatial layer in the set of bins, the second field information indicating an index of the frequency-domain basis vectors in the set of intersections of the frequency-domain basis vectors corresponding to the first spatial layer with the frequency-domain basis vectors corresponding to the second spatial layer in the frequency-domain basis vectors corresponding to the first spatial layer;

wherein the number of bits occupied by the first field information is equal to

The number of bits occupied by the second field information is equal to

X is the size of the union, X is a positive integer,

denotes rounding up, M_iI is the number of frequency domain basis vectors corresponding to the ith spatial layer, i is 1 to 2,

representing M taken from X frequency-domain basis vectors₁The number of the frequency domain basis vector acquisitions,

represents from M₁Taking out M from frequency domain basis vector₁+M₂The number of the X frequency domain basis vector acquisitions.

26. The method of claim 25, wherein the frequency-domain basis vectors corresponding to the second spatial layer comprise the frequency-domain basis vectors indicated by the second field information and the frequency-domain basis vectors except for the frequency-domain basis vectors indicated by the merged first field information.

27. The method according to any one of claims 15-20, wherein R is 2, the third indication information includes a first field information and a second field information, the first field information is a first bitmap, the first bitmap is used for indicating an index of a frequency-domain basis vector corresponding to a first spatial layer in the union, and the second field information is a second bitmap, the second bitmap is used for indicating an index of a frequency-domain basis vector in an intersection of the frequency-domain basis vector corresponding to the first spatial layer and a frequency-domain basis vector corresponding to a second spatial layer in the frequency-domain basis vector corresponding to the first spatial layer;

the number of bits occupied by the first bitmap is X, X is the size of the union set, X is a positive integer, and the number of bits occupied by the second bitmap is the number of frequency domain basis vectors corresponding to the first spatial layer.

28. The method of claim 27, wherein the frequency-domain basis vectors corresponding to the second spatial layer comprise the frequency-domain basis vectors indicated by the second field information and the frequency-domain basis vectors except for the frequency-domain basis vectors indicated by the merged first field information.

29. A communications apparatus, comprising:

the processing unit is used for determining frequency domain basis vectors corresponding to R spatial layers respectively, wherein R is an integer larger than 1;

the communication unit is used for sending Channel State Information (CSI) to the network equipment, wherein the CSI comprises first indication information, second indication information and third indication information;

the first indication information is used to indicate the size of a union set formed by frequency domain basis vectors corresponding to the R spatial layers, the second indication information is used to indicate the index of each frequency domain basis vector in the union set in a candidate frequency domain basis vector set, and the third indication information is used to indicate the index of part or all of the frequency domain basis vectors corresponding to the R spatial layers in the union set.

30. The apparatus of claim 29, wherein the CSI comprises CSI-part 1 and CSI-part 2, the CSI-part 1 comprising the first indication information, the CSI-part 2 comprising the second indication information and the third indication information.

31. The apparatus of claim 29, wherein the first indication information occupies a number of bits

Wherein R is₀For the maximum number of spatial layers supported, R is less than or equal to R ₀，N_fIs the size of the set of candidate frequency domain basis vectors, M_iFor the number of frequency domain basis vectors corresponding to the ith spatial layer, i takes a value from 1 to R₀，

Indicating rounding up.

32. The apparatus of claim 29, wherein the first indication information occupies a number of bits

Wherein R is₀For the maximum number of spatial layers supported, R is less than or equal to R₀，N_fIs the size of the set of candidate frequency domain basis vectors, M_iFor the number of frequency domain basis vectors corresponding to the ith spatial layer, i takes a value from 1 to R₀，

The value range of the first indication information is from M₁To

The M is₁The number of frequency domain basis vectors corresponding to the 1 st spatial layer.

33. The apparatus of claim 32, wherein a correspondence exists between a value of the first indication information and a size of the union.

34. The apparatus of claim 33, wherein the size of the union is equal to a value of the first indication information and M₁The minimum value of the first indication information is 0; or,

the correspondence between the value of the first indication information and the size of the union is predefined.

35. The apparatus according to any of claims 29-34, wherein the second indication information occupies a number of bits of

Wherein X is the size of the union, X is a positive integer,

which means that the rounding is made up,

represents from N_fThe number of the extraction methods for extracting X frequency domain basis vectors from the frequency domain basis vectors, N_fIs the size of the set of candidate frequency domain basis vectors.

36. The apparatus according to any of claims 29-34, wherein the second indication information is a bitmap, and the bitmap occupies N bits_fWherein N is_fIs the size of the set of candidate frequency domain basis vectors.

37. Such asThe apparatus of any one of claims 29-34, wherein the third indication information comprises R field information, an ith field information of the R field information being used to indicate an index of the frequency-domain basis vectors corresponding to the ith spatial layer in the union, and the ith field information occupies a number of bits that is equal to

Wherein X is the size of the union, X is a positive integer,

denotes rounding up, M_iI is the number of frequency domain basis vectors corresponding to the ith spatial layer, i is 1 to R,

representing M taken from X frequency-domain basis vectors_iThe number of the frequency domain basis vector acquisitions.

38. The apparatus according to any of claims 29-34, wherein the third indication information includes R bitmaps, one bitmap is used to indicate indexes of frequency-domain basis vectors corresponding to one spatial layer in the union, the R bitmaps all occupy X bits, X is the size of the union, and X is a positive integer.

39. The apparatus according to any one of claims 29-34, wherein R ═ 2, the third indication information includes first field information and second field information, the first field information indicating an index of the frequency-domain basis vectors corresponding to a first spatial layer in the set of bins, the second field information indicating an index of the frequency-domain basis vectors in the set of intersections of the frequency-domain basis vectors corresponding to the first spatial layer with the frequency-domain basis vectors corresponding to a second spatial layer in the frequency-domain basis vectors corresponding to the first spatial layer;

wherein the number of bits occupied by the first field information is equal to

The number of bits occupied by the second field information is equal to

X is the size of the union, X is a positive integer,

denotes rounding up, M_iI is the number of frequency domain basis vectors corresponding to the ith spatial layer, i is 1 to 2,

representing M taken from X frequency-domain basis vectors₁The number of the frequency domain basis vector acquisitions,

represents from M₁Taking out M from frequency domain basis vector₁+M₂The number of the X frequency domain basis vector acquisitions.

40. The apparatus of claim 39, wherein the frequency-domain basis vectors corresponding to the second spatial layer comprise the frequency-domain basis vectors indicated by the second field information and the frequency-domain basis vectors except for the frequency-domain basis vectors indicated by the merged first field information.

41. The apparatus according to any of claims 29-34, wherein R is 2, the third indication information comprises a first field information and a second field information, the first field information is a first bitmap, the first bitmap is used for indicating an index of a frequency-domain basis vector corresponding to a first spatial layer in the union, and the second field information is a second bitmap, the second bitmap is used for indicating an index of a frequency-domain basis vector in an intersection of the frequency-domain basis vector corresponding to the first spatial layer and a frequency-domain basis vector corresponding to a second spatial layer in the frequency-domain basis vector corresponding to the first spatial layer;

the number of bits occupied by the first bitmap is X, X is the size of the union set, X is a positive integer, and the number of bits occupied by the second bitmap is the number of frequency domain basis vectors corresponding to the first spatial layer.

42. The apparatus of claim 41, wherein the frequency-domain basis vectors corresponding to the second spatial layer comprise the frequency-domain basis vectors indicated by the second field information and the frequency-domain basis vectors except for the frequency-domain basis vectors indicated by the merged first field information.

43. A communications apparatus, comprising:

the communication unit is used for receiving Channel State Information (CSI) from terminal equipment, wherein the CSI comprises first indication information, second indication information and third indication information; the first indication information is used for indicating the size of a union set formed by frequency domain basis vectors corresponding to R spatial layers respectively, the second indication information is used for indicating the index of each frequency domain basis vector in the union set in a candidate frequency domain basis vector set, the third indication information is used for indicating the index of partial or all frequency domain basis vectors corresponding to the R spatial layers respectively in the union set, and R is an integer greater than 1;

and the processing unit is used for determining a precoding matrix according to the CSI.

44. The apparatus of claim 43, wherein the CSI includes a CSI-part 1 and a CSI-part 2, the CSI-part 1 including the first indication information, the CSI-part 2 including the second indication information and the third indication information.

45. The apparatus of claim 43, wherein the first indication information occupies a number of bits

Wherein R is₀For the maximum number of spatial layers supported, R is less than or equal to R ₀，N_fIs the size of the set of candidate frequency domain basis vectors, M_iFor the number of frequency domain basis vectors corresponding to the ith spatial layer, i takes a value from 1 to R₀，

Indicating rounding up.

46. The apparatus of claim 43, wherein the first indication information occupies a number of bits

Wherein R is₀For the maximum number of spatial layers supported, R is less than or equal to R₀，N_fIs the size of the set of candidate frequency domain basis vectors, M_iFor the number of frequency domain basis vectors corresponding to the ith spatial layer, i takes a value from 1 to R₀，

The value range of the first indication information is from M₁To

The M is₁The number of frequency domain basis vectors corresponding to the 1 st spatial layer.

47. The apparatus of claim 46, wherein a correspondence exists between a value of the first indication information and a size of the union.

48. The apparatus of claim 47, wherein the size of the union is equal to the value of the first indication information and M₁The minimum value of the first indication information is 0; or,

the correspondence between the value of the first indication information and the size of the union is predefined.

49. The apparatus according to any of claims 43-48, wherein the second indication information occupies a number of bits of

Wherein X is the size of the union, X is a positive integer,

which means that the rounding is made up,

represents from N_fThe number of the extraction methods for extracting X frequency domain basis vectors from the frequency domain basis vectors, N_fIs the size of the set of candidate frequency domain basis vectors.

50. The apparatus according to any of claims 43-48, wherein the second indication information is a bitmap, the bitmap having N bits_fWherein N is_fIs the size of the set of candidate frequency domain basis vectors.

51. The apparatus of any one of claims 43-48, wherein the third indication information comprises R field information, an ith field information of the R field information being used for indicating an index of the frequency-domain basis vectors corresponding to the ith spatial layer in the union, and the ith field information occupying a number of bits that is

Wherein X is the size of the union, X is a positive integer,

to representRounding up, M_iI is the number of frequency domain basis vectors corresponding to the ith spatial layer, i is 1 to R,

representing M taken from X frequency-domain basis vectors_iThe number of the frequency domain basis vector acquisitions.

52. The apparatus according to any of claims 43-48, wherein the third indication information includes R bitmaps, one bitmap is used to indicate the indexes of the frequency-domain basis vectors corresponding to one spatial layer in the union, the R bitmaps all occupy X bits, X is the size of the union, and X is a positive integer.

53. The apparatus according to any of claims 43-48, wherein R-2, the third indication information comprises a first field information and a second field information, the first field information indicating an index of the frequency-domain basis vector corresponding to a first spatial layer in the union, the second field information indicating an index of the frequency-domain basis vector in the union of the frequency-domain basis vector corresponding to the first spatial layer and the frequency-domain basis vector corresponding to a second spatial layer in the frequency-domain basis vector corresponding to the first spatial layer;

wherein the number of bits occupied by the first field information is equal to

The number of bits occupied by the second field information is equal to

X is the size of the union, X is a positive integer,

denotes rounding up, M_iI is the number of frequency domain basis vectors corresponding to the ith spatial layer, i is 1 to 2,

representing M taken from X frequency-domain basis vectors₁The number of the frequency domain basis vector acquisitions,

represents from M₁Taking out M from frequency domain basis vector₁+M₂The number of the X frequency domain basis vector acquisitions.

54. The apparatus of claim 53, wherein the frequency-domain basis vectors corresponding to the second spatial layer comprise the frequency-domain basis vectors indicated by the second field information and the frequency-domain basis vectors except for the frequency-domain basis vectors indicated by the merged first field information.

55. The apparatus according to any of claims 43-48, wherein R is 2, the third indication information comprises a first field information and a second field information, the first field information is a first bitmap, the first bitmap is used for indicating the index of the frequency-domain basis vector corresponding to the first spatial layer in the union, the second field information is a second bitmap, the second bitmap is used for indicating the index of the frequency-domain basis vector in the intersection of the frequency-domain basis vector corresponding to the first spatial layer and the frequency-domain basis vector corresponding to the second spatial layer in the frequency-domain basis vector corresponding to the first spatial layer;

the number of bits occupied by the first bitmap is X, X is the size of the union set, X is a positive integer, and the number of bits occupied by the second bitmap is the number of frequency domain basis vectors corresponding to the first spatial layer.

56. The apparatus of claim 55, wherein the frequency-domain basis vectors corresponding to the second spatial layer comprise the frequency-domain basis vectors indicated by the second field information and the frequency-domain basis vectors except for the frequency-domain basis vectors indicated by the merged first field information.

57. A method of communication, comprising:

the terminal equipment determines frequency domain basis vectors corresponding to R spatial layers respectively, wherein R is an integer larger than 1;

the terminal equipment sends Channel State Information (CSI) to network equipment, wherein the CSI comprises first indication information, second indication information and third indication information;

wherein the first indication information is used to indicate the size of an intersection of the frequency-domain basis vectors corresponding to the R spatial layers, the second indication information is used to indicate the index of each frequency-domain basis vector in the intersection in the candidate frequency-domain basis vector set, and the third indication information is used to indicate the index of the frequency-domain basis vector except the intersection in some or all of the frequency-domain basis vectors corresponding to the R spatial layers in the candidate frequency-domain basis vector set except the intersection.

58. The method of claim 57, wherein the CSI includes CSI-part 1 and CSI-part 2, the CSI-part 1 including the first indication information, the CSI-part 2 including the second indication information and the third indication information.

59. The method of claim 57, wherein the first indication information occupies a number of bits

Wherein M is_iFor the number of frequency domain basis vectors corresponding to the ith spatial layer, i takes a value from 1 to R₀，

Denotes rounding up, R₀The maximum number of spatial layers supported.

60. As in claimThe method of claim 57, wherein the second indication message occupies a number of bits of

Wherein Y is the size of the intersection and Y is a positive integer,

which means that the rounding is made up,

represents from N_fThe number of the extraction methods for extracting Y frequency domain basis vectors from the frequency domain basis vectors, N_fIs the size of the set of candidate frequency domain basis vectors.

61. The method of claim 57, wherein the second indication information is a bitmap, and the bitmap occupies N bits_fWherein N is_fIs the size of the set of candidate frequency domain basis vectors.

62. The method of any one of claims 57-61, wherein the third indication information includes R field information, an ith field information of the R field information being used to indicate an index of frequency-domain basis vectors, except the intersection, of the frequency-domain basis vectors corresponding to the ith spatial layer in a set of frequency-domain basis vectors, except the intersection, of the candidate set of frequency-domain basis vectors, and the ith field information occupies a number of bits that is equal to

Wherein Y is the size of the intersection, Y is a positive integer,

denotes rounding up, M_iNumber of frequency-domain basis vectors, i, corresponding to the ith spatial layerThe value of which is from 1 to R,

represents from N_f-taking M out of Y frequency domain basis vectors_iThe number of the divisions of the Y frequency-domain basis vectors, N_fIs the size of the set of candidate frequency domain basis vectors.

63. The method according to any of claims 57-61, wherein the third indication information comprises R bitmaps, one bitmap is used for indicating the indexes, in the candidate set of frequency-domain basis vectors, of the frequency-domain basis vectors corresponding to one spatial layer except for the intersection, and the R bitmaps each occupy N bits_f-Y, wherein N_fAnd Y is the size of the intersection set.

64. The method according to any one of claims 57-61, wherein R-2, the third indication information includes a first field information and a second field information, the first field information indicating an index of a set of frequency-domain basis vectors of the frequency-domain basis vectors corresponding to a first spatial layer, excluding the intersection, in the set of candidate frequency-domain basis vectors, the second field information indicating an index of a set of frequency-domain basis vectors of the frequency-domain basis vectors corresponding to a second spatial layer, excluding the intersection, in the set of candidate frequency-domain basis vectors, excluding the frequency-domain basis vector corresponding to the first spatial layer;

Wherein the number of bits occupied by the first field information is equal to

The number of bits occupied by the second field information is equal to

Y is the size of the intersection, YIs a positive integer and is a non-zero integer,

denotes rounding up, M_iI is the number of frequency domain basis vectors corresponding to the ith spatial layer, i is 1 to 2,

represents from N_f-taking M out of Y frequency domain basis vectors₁-the number of the divisions of the Y frequency-domain basis vectors,

represents from N_f-M₁Taking out M from frequency domain basis vector₂The number of the divisions of the Y frequency-domain basis vectors, N_fIs the size of the set of candidate frequency domain basis vectors.

65. The method according to any one of claims 57-61, wherein R is 2, the third indication information includes a first field information and a second field information, the first field information is a first bitmap, the first field information is used for indicating an index of a frequency-domain basis vector except the intersection in the set of candidate frequency-domain basis vectors except the intersection in the set of frequency-domain basis vectors corresponding to a first spatial layer, and the second field information is used for indicating an index of a frequency-domain basis vector except the intersection in a set of candidate frequency-domain basis vectors except the frequency-domain basis vector corresponding to the first spatial layer in the set of candidate frequency-domain basis vectors except the intersection;

Wherein the number of bits occupied by the first bit bitmap is equal to N_f-Y, second bitmap N_fSubtracting the number of frequency domain basis vectors corresponding to the first spatial layer, Y being the size of the intersection, Y being a positive integer, N_fIs the size of the set of candidate frequency domain basis vectors.

66. The method according to any of claims 57-61, wherein the frequency-domain basis vectors corresponding to the first spatial layer comprise the frequency-domain basis vectors indicated by the first field information and the frequency-domain basis vectors in the intersection, and wherein the frequency-domain basis vectors corresponding to the second spatial layer comprise the frequency-domain basis vectors indicated by the second field information and the frequency-domain basis vectors in the intersection.

67. A method of communication, comprising:

the method comprises the steps that the network equipment receives Channel State Information (CSI) from the terminal equipment, wherein the CSI comprises first indication information, second indication information and third indication information; wherein the first indication information is used for indicating the size of an intersection of frequency-domain basis vectors corresponding to R spatial layers respectively, the second indication information is used for indicating the index of each frequency-domain basis vector in the intersection in a candidate frequency-domain basis vector set, and the third indication information is used for indicating the index of frequency-domain basis vectors except the intersection in a set of frequency-domain basis vectors except the intersection in a partial or all frequency-domain basis vectors corresponding to the R spatial layers respectively;

And the network equipment determines a precoding matrix according to the CSI.

68. The method of claim 67, wherein the CSI includes CSI-part 1 and CSI-part 2, the CSI-part 1 including the first indication information, the CSI-part 2 including the second indication information and the third indication information.

69. The method of claim 67, wherein the first indication information occupies bits of bits

Wherein M is_iFor the number of frequency domain basis vectors corresponding to the ith spatial layer, i takes a value from 1 to R₀，

Denotes rounding up, R₀The maximum number of spatial layers supported.

70. The method of claim 67, wherein the second indication information occupies bits of bits

Wherein Y is the size of the intersection and Y is a positive integer,

which means that the rounding is made up,

represents from N_fThe number of the extraction methods for extracting Y frequency domain basis vectors from the frequency domain basis vectors, N_fIs the size of the set of candidate frequency domain basis vectors.

71. The method of claim 67, wherein the second indication information is a bitmap, and the bitmap occupies N bits_fWherein N is_fIs the size of the set of candidate frequency domain basis vectors.

72. The method of any one of claims 67-71, wherein the third indication information includes R field information, an ith field information of the R field information being used to indicate an index of frequency-domain basis vectors, except the intersection, of the frequency-domain basis vectors corresponding to the ith spatial layer in a set of frequency-domain basis vectors, except the intersection, of the candidate set of frequency-domain basis vectors, and the ith field information occupies a number of bits that is equal to

Wherein Y is the size of the intersection,y is a positive integer and is a non-linear alkyl,

denotes rounding up, M_iI is the number of frequency domain basis vectors corresponding to the ith spatial layer, i is 1 to R,

represents from N_f-taking M out of Y frequency domain basis vectors_iThe number of the divisions of the Y frequency-domain basis vectors, N_fIs the size of the set of candidate frequency domain basis vectors.

73. The method according to any of claims 67-71, wherein the third indication information comprises R bitmaps, one bitmap is used for indicating the indexes, in the candidate set of frequency-domain basis vectors, of the frequency-domain basis vectors corresponding to one spatial layer except for the intersection, and the R bitmaps each occupy N bits_f-Y, wherein N _fAnd Y is the size of the intersection set.

74. The method according to any of claims 67-71, wherein R-2, the third indication information comprises a first field information and a second field information, the first field information indicating an index of a set of frequency-domain basis vectors of the frequency-domain basis vectors corresponding to a first spatial layer other than the intersection in the set of candidate frequency-domain basis vectors other than the intersection, the second field information indicating an index of a set of frequency-domain basis vectors of the frequency-domain basis vectors corresponding to a second spatial layer other than the intersection in the set of candidate frequency-domain basis vectors other than the frequency-domain basis vector corresponding to the first spatial layer;

wherein the number of bits occupied by the first field information is equal to

The number of bits occupied by the second field information is equal to

Y is the size of the intersection, Y is a positive integer,

denotes rounding up, M_iI is the number of frequency domain basis vectors corresponding to the ith spatial layer, i is 1 to 2,

represents from N_f-taking M out of Y frequency domain basis vectors₁-the number of the divisions of the Y frequency-domain basis vectors,

Represents from N_f-M₁Taking out M from frequency domain basis vector₂The number of the divisions of the Y frequency-domain basis vectors, N_fIs the size of the set of candidate frequency domain basis vectors.

75. The method according to any of claims 67-71, wherein R is 2, the third indication information includes a first field information and a second field information, the first field information is a first bitmap, the first field information is used to indicate an index of a set of frequency-domain basis vectors of the frequency-domain basis vectors corresponding to the first spatial layer, excluding the intersection, in the set of candidate frequency-domain basis vectors, the second field information is used to indicate an index of a set of frequency-domain basis vectors of the frequency-domain basis vectors corresponding to the second spatial layer, excluding the intersection, in the set of candidate frequency-domain basis vectors, the frequency-domain basis vectors of the frequency-domain basis vectors corresponding to the first spatial layer, the second field information is used to indicate an index of a set of frequency-domain basis vectors of the frequency-domain basis vectors corresponding to the second spatial layer, excluding the frequency-domain basis vectors corresponding to the first spatial layer;

wherein the number of bits occupied by the first bit bitmap is equal to N_f-Y, second bitmap N_fSubtracting the first spatial layerThe number of corresponding frequency domain basis vectors, Y being the size of the intersection, Y being a positive integer, N _fIs the size of the set of candidate frequency domain basis vectors.

76. The method according to any of claims 67-71, wherein the frequency-domain basis vectors corresponding to the first spatial layer comprise the frequency-domain basis vectors indicated by the first field information and the frequency-domain basis vectors in the intersection, and wherein the frequency-domain basis vectors corresponding to the second spatial layer comprise the frequency-domain basis vectors indicated by the second field information and the frequency-domain basis vectors in the intersection.

77. A communications apparatus, comprising:

the processing unit is used for determining frequency domain basis vectors corresponding to R spatial layers respectively, wherein R is an integer larger than 1;

the communication unit is used for sending Channel State Information (CSI) to the network equipment, wherein the CSI comprises first indication information, second indication information and third indication information;

wherein the first indication information is used to indicate the size of an intersection of the frequency-domain basis vectors corresponding to the R spatial layers, the second indication information is used to indicate the index of each frequency-domain basis vector in the intersection in the candidate frequency-domain basis vector set, and the third indication information is used to indicate the index of the frequency-domain basis vector except the intersection in some or all of the frequency-domain basis vectors corresponding to the R spatial layers in the candidate frequency-domain basis vector set except the intersection.

78. The apparatus of claim 77, wherein the CSI includes CSI-part 1 and CSI-part 2, the CSI-part 1 including the first indication information, the CSI-part 2 including the second indication information and the third indication information.

79. The apparatus of claim 77, wherein the first indication information occupies a number of bits

Wherein M is_iFor the number of frequency domain basis vectors corresponding to the ith spatial layer, i takes a value from 1 to R₀，

Denotes rounding up, R₀The maximum number of spatial layers supported.

80. The apparatus of claim 77, wherein the second indication information occupies a number of bits

Wherein Y is the size of the intersection and Y is a positive integer,

which means that the rounding is made up,

represents from N_fThe number of the extraction methods for extracting Y frequency domain basis vectors from the frequency domain basis vectors, N_fIs the size of the set of candidate frequency domain basis vectors.

81. The apparatus of claim 77, wherein the second indication information is a bitmap, the bitmap occupying a number of bits of N_fWherein N is_fIs the size of the set of candidate frequency domain basis vectors.

82. The apparatus of any one of claims 77-81, wherein the third indication information comprises R field information, an ith field information of the R field information being used to indicate that frequency-domain basis vectors of frequency-domain basis vectors corresponding to an ith spatial layer other than the intersection are in the candidate frequency-domain basis vector The index in the set formed by the frequency domain basis vectors except the intersection is collected, and the bit number occupied by the ith field information is

Wherein Y is the size of the intersection, Y is a positive integer,

denotes rounding up, M_iI is the number of frequency domain basis vectors corresponding to the ith spatial layer, i is 1 to R,

represents from N_f-taking M out of Y frequency domain basis vectors_iThe number of the divisions of the Y frequency-domain basis vectors, N_fIs the size of the set of candidate frequency domain basis vectors.

83. The apparatus according to any of claims 77-81, wherein the third indication information comprises R bitmaps, one bitmap is used for indicating the indexes, in the candidate set of frequency-domain basis vectors, of the frequency-domain basis vectors corresponding to one spatial layer except for the intersection, and the R bitmaps each occupy N bits_f-Y, wherein N_fAnd Y is the size of the intersection set.

84. The apparatus according to any one of claims 77-81, wherein R-2, the third indication information comprises a first field information indicating an index of a set of frequency-domain basis vectors of the frequency-domain basis vectors corresponding to a first spatial layer, excluding the intersection, in the set of candidate frequency-domain basis vectors, and a second field information indicating an index of a set of frequency-domain basis vectors of the frequency-domain basis vectors corresponding to a second spatial layer, excluding the intersection, in the set of candidate frequency-domain basis vectors;

Wherein the number of bits occupied by the first field information is equal to

The number of bits occupied by the second field information is equal to

Y is the size of the intersection, Y is a positive integer,

denotes rounding up, M_iI is the number of frequency domain basis vectors corresponding to the ith spatial layer, i is 1 to 2,

represents from N_f-taking M out of Y frequency domain basis vectors₁-the number of the divisions of the Y frequency-domain basis vectors,

represents from N_f-M₁Taking out M from frequency domain basis vector₂The number of the divisions of the Y frequency-domain basis vectors, N_fIs the size of the set of candidate frequency domain basis vectors.

85. The apparatus according to any one of claims 77-81, wherein R is 2, the third indication information includes a first field information and a second field information, the first field information is a first bitmap, the first field information is used to indicate an index of a frequency-domain basis vector of the frequency-domain basis vectors corresponding to the first spatial layer, except the intersection, in a set of frequency-domain basis vectors of the candidate set of frequency-domain basis vectors, the second field information is used to indicate an index of a frequency-domain basis vector of the frequency-domain basis vectors corresponding to the second spatial layer, except the intersection, in a set of frequency-domain basis vectors of the candidate set of frequency-domain basis vectors, the frequency-domain basis vector of the second spatial layer, except the intersection, in the set of frequency-domain basis vectors, the third field information is used to indicate an index of a set of frequency-domain basis vectors of the candidate set of frequency-domain basis vectors, the third field information is used to indicate an index of the frequency-domain basis vectors of the second spatial layer, the set of the candidate set of frequency-domain basis vectors, the second spatial layer, the third field information is used to indicate an index of the set of the frequency-domain basis vectors, the set of the second spatial layer;

Wherein the number of bits occupied by the first bit bitmap is equal to N_f-Y, second bitmap N_fSubtracting the number of frequency domain basis vectors corresponding to the first spatial layer, Y being the size of the intersection, Y being a positive integer, N_fIs the size of the set of candidate frequency domain basis vectors.

86. The apparatus according to any one of claims 77-81, wherein the frequency-domain basis vectors corresponding to the first spatial layer comprise the frequency-domain basis vectors indicated by the first field information and the frequency-domain basis vectors in the intersection, and wherein the frequency-domain basis vectors corresponding to the second spatial layer comprise the frequency-domain basis vectors indicated by the second field information and the frequency-domain basis vectors in the intersection.

87. A communications apparatus, comprising:

the communication unit is used for receiving Channel State Information (CSI) from terminal equipment, wherein the CSI comprises first indication information, second indication information and third indication information; wherein the first indication information is used for indicating the size of an intersection of frequency-domain basis vectors corresponding to R spatial layers respectively, the second indication information is used for indicating the index of each frequency-domain basis vector in the intersection in a candidate frequency-domain basis vector set, and the third indication information is used for indicating the index of frequency-domain basis vectors except the intersection in a set of frequency-domain basis vectors except the intersection in a partial or all frequency-domain basis vectors corresponding to the R spatial layers respectively;

And the processing unit is used for determining a precoding matrix according to the CSI.

88. The apparatus of claim 87, wherein the CSI includes CSI-part 1 and CSI-part 2, the CSI-part 1 including the first indication information, the CSI-part 2 including the second indication information and the third indication information.

89. The apparatus of claim 87, wherein the first indication information occupies a number of bits

Wherein M is_iFor the number of frequency domain basis vectors corresponding to the ith spatial layer, i takes a value from 1 to R₀，

Denotes rounding up, R₀The maximum number of spatial layers supported.

90. The apparatus of claim 87, wherein the second indication information occupies a number of bits

Wherein Y is the size of the intersection and Y is a positive integer,

which means that the rounding is made up,

represents from N_fThe number of the extraction methods for extracting Y frequency domain basis vectors from the frequency domain basis vectors, N_fIs the size of the set of candidate frequency domain basis vectors.

91. The apparatus according to claim 87, wherein the second indication information is a bitmap, and the bitmap occupies N bits_fWherein N is_fIs the size of the set of candidate frequency domain basis vectors.

92. The method of any of claims 87-91The apparatus is characterized in that the third indication information includes R field information, an ith field information in the R field information is used to indicate an index of frequency-domain basis vectors, except the intersection, in the set of frequency-domain basis vectors, of the frequency-domain basis vectors corresponding to the ith spatial layer, where the number of bits occupied by the ith field information is equal to that of the set of frequency-domain basis vectors, except the intersection, in the set of frequency-domain basis vectors of the candidate set of frequency-domain basis vectors

Wherein Y is the size of the intersection, Y is a positive integer,

denotes rounding up, M_iI is the number of frequency domain basis vectors corresponding to the ith spatial layer, i is 1 to R,

represents from N_f-taking M out of Y frequency domain basis vectors_iThe number of the divisions of the Y frequency-domain basis vectors, N_fIs the size of the set of candidate frequency domain basis vectors.

93. The apparatus according to any of claims 87-91, wherein the third indication information comprises R bitmaps, one bitmap is used for indicating the indexes, in the candidate set of frequency-domain basis vectors, of the frequency-domain basis vectors corresponding to one spatial layer except for the intersection, and the R bitmaps each occupy N bits_f-Y, wherein N _fAnd Y is the size of the intersection set.

94. The apparatus according to any one of claims 87-91, wherein R-2, the third indication information comprises a first field information indicating an index of a set of frequency-domain basis vectors of the frequency-domain basis vectors corresponding to a first spatial layer, excluding the intersection, in the set of candidate frequency-domain basis vectors, and a second field information indicating an index of a set of frequency-domain basis vectors of the frequency-domain basis vectors corresponding to a second spatial layer, excluding the intersection, in the set of candidate frequency-domain basis vectors;

wherein the number of bits occupied by the first field information is equal to

The number of bits occupied by the second field information is equal to

Y is the size of the intersection, Y is a positive integer,

denotes rounding up, M_iI is the number of frequency domain basis vectors corresponding to the ith spatial layer, i is 1 to 2,

represents from N_f-taking M out of Y frequency domain basis vectors₁-the number of the divisions of the Y frequency-domain basis vectors,

Represents from N_f-M₁Taking out M from frequency domain basis vector₂The number of the divisions of the Y frequency-domain basis vectors, N_fIs the size of the set of candidate frequency domain basis vectors.

95. The apparatus according to any of claims 87-91, wherein R is 2, the third indication information includes a first field information and a second field information, the first field information is a first bitmap, the first field information is used to indicate an index of a frequency-domain basis vector of the frequency-domain basis vectors corresponding to the first spatial layer, except the intersection, in a set of frequency-domain basis vectors of the candidate set of frequency-domain basis vectors, the second field information is used to indicate an index of a frequency-domain basis vector of the frequency-domain basis vectors corresponding to the second spatial layer, except the intersection, in a set of frequency-domain basis vectors of the candidate set of frequency-domain basis vectors, the frequency-domain basis vector of the second spatial layer, except the intersection, in the set of frequency-domain basis vectors, the third field information is used to indicate an index of a set of frequency-domain basis vectors of the candidate set of frequency-domain basis vectors, the third field information is used to indicate an index of the frequency-domain basis vectors of the second spatial layer, the set of the candidate set of frequency-domain basis vectors, the second spatial layer, the third field information is used to indicate an index of the set of the frequency-domain basis vectors, the set of the candidate set of the first spatial layer;

wherein the number of bits occupied by the first bit bitmap is equal to N_f-Y, second bitmap N_fSubtracting the number of frequency domain basis vectors corresponding to the first spatial layer, Y being the size of the intersection, Y being a positive integer, N _fIs the size of the set of candidate frequency domain basis vectors.

96. The apparatus according to any one of claims 87-91, wherein the frequency-domain basis vectors corresponding to the first spatial layer comprise the frequency-domain basis vectors indicated by the first field information and the frequency-domain basis vectors in the intersection, and wherein the frequency-domain basis vectors corresponding to the second spatial layer comprise the frequency-domain basis vectors indicated by the second field information and the frequency-domain basis vectors in the intersection.

97. A method of communication, comprising:

the terminal equipment determines frequency domain basis vectors corresponding to R spatial layers respectively, wherein R is an integer greater than or equal to 1;

the terminal equipment sends Channel State Information (CSI) to network equipment, wherein the CSI comprises first indication information, second indication information and third indication information;

wherein the first indication information is used for indicating the size of a first set, and the first set comprises N continuous in index cycle in a candidate frequency domain base vector set₃A frequency domain basis vector, N₃Each frequency domain basis vector comprises a union set formed by the frequency domain basis vectors respectively corresponding to the R spatial layers, and the index circularly and continuously indexes N₃A first frequency-domain basis vector and a last frequency-domain basis vector of the frequency-domain basis vectors The quantities are all frequency domain basis vectors in the union; the second indication information is used for indicating the index of the first frequency-domain basis vector in the first set in the candidate frequency-domain basis vector set; the third indication information is used to indicate indexes of partial or all frequency-domain basis vectors respectively corresponding to the R spatial layers in the first set.

98. The method of claim 97, wherein the CSI comprises CSI-portion 1 and CSI-portion 2, the CSI-portion 1 comprising the first indication information, the CSI-portion 2 comprising the second indication information and the third indication information.

99. The method of claim 97, wherein the first indication information occupies a number of bits

Wherein N is_fFor the size of the candidate frequency domain basis vector set, the M₁The number of frequency domain basis vectors corresponding to the 1 st spatial layer,

the value range of the first indication information is from M₁To N_f。

100. The method of claim 99, wherein there is a correspondence between a value of the first indication information and a size of the first set.

101. The method of claim 100, wherein the size of the first set is equal to the value and M of the first indication information ₁The minimum value of the first indication information is 0; or,

the correspondence between the value of the first indication information and the size of the first set is predefined.

102. The method according to any of claims 97-101, wherein said second indication information occupies a number of bits of

Wherein,

denotes rounding up, N_fIs the size of the set of candidate frequency domain basis vectors.

103. The method of any one of claims 97-101, wherein the third indication information comprises R field information, an ith field information of the R field information being used for indicating an index of a frequency-domain basis vector corresponding to an ith spatial layer in the first set, the ith field information occupying a number of bits of the first set

Wherein,

denotes rounding up, M_iI is the number of frequency domain basis vectors corresponding to the ith spatial layer, i is 1 to R,

represents from N₃Taking out M from frequency domain basis vector_iThe number of the frequency domain basis vector acquisitions.

104. The method according to any of claims 97-101, wherein the third indication information comprises R bitmaps, one bitmap is used for indicating the index of the frequency-domain basis vector corresponding to one spatial layer in the first set, and the R bitmaps all occupy N bits ₃。

105. The method of any one of claims 97-101, wherein N is₃The index of each frequency domain basis vector is mod (M)_initial+n，N_f)，n＝0，1，……，N₃-1，M_initialRepresenting an index, N, of the first one of the first set of frequency-domain basis vectors in the set of candidate frequency-domain basis vectors_fIs the size of the set of candidate frequency domain basis vectors.

106. A method of communication, comprising:

the method comprises the steps that the network equipment receives Channel State Information (CSI) from the terminal equipment, wherein the CSI comprises first indication information, second indication information and third indication information; wherein the first indication information is used for indicating the size of a first set, and the first set comprises N continuous in index cycle in a candidate frequency domain base vector set₃A frequency domain basis vector, N₃Each frequency domain base vector comprises a union set formed by frequency domain base vectors respectively corresponding to R spatial layers, and the index is circularly continuous with N₃The first frequency domain basis vector and the last frequency domain basis vector in the frequency domain basis vectors are the frequency domain basis vectors in the union set; the second indication information is used for indicating the index of the first frequency-domain basis vector in the first set in the candidate frequency-domain basis vector set; the third indication information is used to indicate indexes of partial or all frequency-domain basis vectors corresponding to the R spatial layers respectively in the first set, where R is an integer greater than or equal to 1;

And the network equipment determines a precoding matrix according to the CSI.

107. The method of claim 106, wherein the CSI comprises CSI-portion 1 and CSI-portion 2, wherein the CSI-portion 1 comprises the first indication information, and wherein the CSI-portion 2 comprises the second indication information and the third indication information.

108. The method of claim 106, wherein the step of applying comprises applying a voltage to the substrateThen, the number of bits occupied by the first indication information is

Wherein N is_fFor the size of the candidate frequency domain basis vector set, the M₁The number of frequency domain basis vectors corresponding to the 1 st spatial layer,

the value range of the first indication information is from M₁To N_f。

109. The method of claim 108, wherein there is a correspondence between a value of the first indication information and a size of the first set.

110. The method of claim 109, wherein the size of the first set is equal to the value and M of the first indication information₁The minimum value of the first indication information is 0; or,

the correspondence between the value of the first indication information and the size of the first set is predefined.

111. The method as claimed in any one of claims 106-110, wherein the second indication message occupies a number of bits of the second indication message

Wherein,

denotes rounding up, N_fIs the size of the set of candidate frequency domain basis vectors.

112. The method as claimed in any one of claims 106-110, wherein the third indication information comprises R wordsSegment information, wherein the ith segment information in the R segment information is used to indicate an index of a frequency domain basis vector corresponding to the ith spatial layer in the first set, and the number of bits occupied by the ith segment information is

Wherein,

denotes rounding up, M_iI is the number of frequency domain basis vectors corresponding to the ith spatial layer, i is 1 to R,

represents from N₃Taking out M from frequency domain basis vector_iThe number of the frequency domain basis vector acquisitions.

113. The method as claimed in any one of claims 106-110, wherein the third indication information comprises R bitmaps, one bitmap is used to indicate the index of the frequency-domain basis vector corresponding to one spatial layer in the first set, and the number of bits occupied by the R bitmaps is N₃。

114. The method as set forth in claim 106-110, wherein N is ₃The index of each frequency domain basis vector is mod (M)_initial+n，N_f)，n＝0，1，……，N₃-1，M_initialRepresenting an index, N, of the first one of the first set of frequency-domain basis vectors in the set of candidate frequency-domain basis vectors_fIs the size of the set of candidate frequency domain basis vectors.

115. A communications apparatus, comprising:

the processing unit is used for determining frequency domain basis vectors corresponding to R spatial layers respectively, wherein R is an integer greater than or equal to 1;

the communication unit is used for sending Channel State Information (CSI) to the network equipment, wherein the CSI comprises first indication information, second indication information and third indication information;

wherein the first indication information is used for indicating the size of a first set, and the first set comprises N continuous in index cycle in a candidate frequency domain base vector set₃A frequency domain basis vector, N₃Each frequency domain basis vector comprises a union set formed by the frequency domain basis vectors respectively corresponding to the R spatial layers, and the index circularly and continuously indexes N₃The first frequency domain basis vector and the last frequency domain basis vector in the frequency domain basis vectors are the frequency domain basis vectors in the union set; the second indication information is used for indicating the index of the first frequency-domain basis vector in the first set in the candidate frequency-domain basis vector set; the third indication information is used to indicate indexes of partial or all frequency-domain basis vectors respectively corresponding to the R spatial layers in the first set.

116. The apparatus of claim 115, wherein the CSI comprises CSI-portion 1 and CSI-portion 2, the CSI-portion 1 comprising the first indication information, the CSI-portion 2 comprising the second indication information and the third indication information.

117. The apparatus of claim 115, wherein the first indication information occupies a number of bits

Wherein N is_fFor the size of the candidate frequency domain basis vector set, the M₁The number of frequency domain basis vectors corresponding to the 1 st spatial layer,

the value range of the first indication information is from M₁To N_f。

118. The apparatus of claim 117, wherein a correspondence exists between a value of the first indication information and a size of the first set.

119. The apparatus of claim 118, wherein the first set has a size equal to a value of the first indication information and M₁The minimum value of the first indication information is 0; or,

the correspondence between the value of the first indication information and the size of the first set is predefined.

120. The apparatus as set forth in claim 115-119, wherein the second indication message occupies a number of bits

Wherein,

denotes rounding up, N_fIs the size of the set of candidate frequency domain basis vectors.

121. The apparatus as claimed in any one of claims 115-119, wherein the third indication information comprises R field information, an ith field information of the R field information is used to indicate an index of the frequency-domain basis vector corresponding to the ith spatial layer in the first set, and the number of bits occupied by the ith field information is

Wherein,

denotes rounding up, M_iI is the number of frequency domain basis vectors corresponding to the ith spatial layer, i is 1 to R,

represents from N₃Taking out M from frequency domain basis vector_iThe number of the frequency domain basis vector acquisitions.

122. The apparatus as claimed in any of claims 115-119, wherein the third indication information comprises R bitmaps, one bitmap is used to indicate the index of the frequency-domain basis vector corresponding to one spatial layer in the first set, and the number of bits occupied by the R bitmaps is N₃。

123. The apparatus as set forth in claim 115-119, wherein N is₃The index of each frequency domain basis vector is mod (M)_initial+n，N_f)，n＝0，1，……，N₃-1，M_initialRepresenting an index, N, of the first one of the first set of frequency-domain basis vectors in the set of candidate frequency-domain basis vectors _fIs the size of the set of candidate frequency domain basis vectors.

124. A communications apparatus, comprising:

the communication unit is used for receiving Channel State Information (CSI) from terminal equipment, wherein the CSI comprises first indication information, second indication information and third indication information; wherein the first indication information is used for indicating the size of a first set, and the first set comprises N continuous in index cycle in a candidate frequency domain base vector set₃A frequency domain basis vector, N₃Each frequency domain base vector comprises a union set formed by frequency domain base vectors respectively corresponding to R spatial layers, and the index is circularly continuous with N₃The first frequency domain basis vector and the last frequency domain basis vector in the frequency domain basis vectors are the frequency domain basis vectors in the union set; the second indication information is used for indicating the index of the first frequency-domain basis vector in the first set in the candidate frequency-domain basis vector set; the third indication information is used for indicating that the partial or all frequency domain basis vectors respectively corresponding to the R spatial layers are in the first regionIndexes in the set, R is an integer greater than or equal to 1;

and the processing unit is used for determining a precoding matrix according to the CSI.

125. The apparatus of claim 124, wherein the CSI comprises CSI-part 1 and CSI-part 2, the CSI-part 1 comprising the first indication information, the CSI-part 2 comprising the second indication information and the third indication information.

126. The apparatus of claim 124, wherein the first indication information occupies a number of bits

Wherein N is_fFor the size of the candidate frequency domain basis vector set, the M₁The number of frequency domain basis vectors corresponding to the 1 st spatial layer,

the value range of the first indication information is from M₁To N_f。

127. The apparatus of claim 126, wherein a correspondence exists between a value of the first indication information and a size of the first set.

128. The apparatus of claim 127, wherein the size of the first set is equal to the value of the first indication information and M₁The minimum value of the first indication information is 0; or,

the correspondence between the value of the first indication information and the size of the first set is predefined.

129. The apparatus as claimed in any one of claims 124-128, wherein the second indication message occupies a number of bits of the second indication message

Wherein,

denotes rounding up, N_fIs the size of the set of candidate frequency domain basis vectors.

130. The apparatus as claimed in any of claims 124-128, wherein the third indication information comprises R field information, an ith field information of the R field information is used to indicate an index of the frequency-domain basis vector corresponding to the ith spatial layer in the first set, and the number of bits occupied by the ith field information is

Wherein,

denotes rounding up, M_iI is the number of frequency domain basis vectors corresponding to the ith spatial layer, i is 1 to R,

represents from N₃Taking out M from frequency domain basis vector_iThe number of the frequency domain basis vector acquisitions.

131. The apparatus as claimed in any of claims 124-128, wherein the third indication information comprises R bitmaps, one bitmap is used to indicate the index of the frequency-domain basis vector corresponding to one spatial layer in the first set, and the number of bits occupied by the R bitmaps is N₃。

132. The apparatus as claimed in any one of claims 124 and 128, wherein N is₃An index of the frequency domain basis vector ismod(M_initial+n，N_f)，n＝0，1，……，N₃-1，M_initialRepresenting an index, N, of the first one of the first set of frequency-domain basis vectors in the set of candidate frequency-domain basis vectors _fIs the size of the set of candidate frequency domain basis vectors.

Images