CN108111211B - Feedback method, device and management device for channel state information

Info

Abstract

Description

Claims

CN108111211B

Publication number: CN108111211B
Application number: CN201710687445.5A
Authority: CN
Inventors: 蔡剑兴; 吴昊; 鲁照华; 肖华华; 陈艺戬; 周聪; 李儒岳; 李永; 王瑜新
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2017-08-11
Filing date: 2017-08-11
Publication date: 2021-11-02
Anticipated expiration: 2037-08-11
Also published as: CN108111211A

The invention provides a feedback method, a device and a management device of channel state information, wherein the method comprises the following steps: determining the value of the configuration parameter; determining feedback information according to the value of the configuration parameter; feeding back channel state information to the base station according to the feedback information, wherein a Precoding Matrix Indicator (PMI) in the channel state information comprises at least one of the following information: phase indicates PI and relative power indicates RPI. The invention solves the problem of high feedback channel state information overhead in the related technology, thereby achieving the effect of reducing the feedback overhead.

Feedback method and device of channel state information and management equipment

Technical Field

The present invention relates to the field of communications, and in particular, to a method, an apparatus, and a management device for feeding back channel state information.

Background

In a wireless communication system, a transmitting end and a receiving end generally use multiple antennas to transmit and receive to obtain a higher rate. Among them, multiple-input-multiple-output (MIMO) is a multi-layer transmission technique that uses some characteristics of a channel to form a matching channel characteristic. There are multiple modes 2-10 of multi-antenna technology transmission in Long Term Evolution (Long Term Evolution, abbreviated as LTE) and its enhanced version Long Term Evolution-Advanced, abbreviated as LTE-a) systems. Some concepts are introduced below:

there are two feedback modes for Channel State Information (CSI), namely periodic feedback and aperiodic feedback, for example, in an LTE system, an Uplink Control Channel (PUCCH) is used for periodic feedback, and a Physical Uplink Shared Channel (PUSCH) is used for aperiodic feedback. There are two main ways for feedback of terminal CSI: the base station can configure the terminal to measure and quantize Channel Information, and periodically feed back quantized Channel State Information (CSI) Information (including Rank Indicator (RI)/Precoding Matrix Indicator (PMI)/Channel Quality Indicator (CQI)) through a PUCCH.

In the current system, the precoding matrix is fed back or the beam is configured based on the strongest path information in the channel, and the information of other paths of the channel is ignored, so that the fed back or configured information cannot be well matched with the channel, and the performance of the system is affected. In the discussion of the 3GPP regarding the 5G standard, a codebook based on linear weighted combination of multiple path information is introduced into the NR system, so that the feedback accuracy can be greatly improved and the performance of the system can be improved. In the method for feeding back CSI by using a linear weighted combination codebook, channel information is quantized into a linear combination of a plurality of beams, namely a precoding code word of each layer is a linear combination of a plurality of one-dimensional or two-dimensional DFT vectors, each one-dimensional or two-dimensional DFT vector can utilize PMI feedback according to the mode, the amplitude of a corresponding weighting coefficient of each PMI can indicate RPI feedback by using relative power, and the phase of the weighting coefficient can indicate PI feedback by using phase.

The amplitude weighting coefficient and the phase weighting coefficient of each piece of path information need to be fed back or configured in the merging process, so that the overhead of the system is very large. In addition, since both RPI and PI may be fed back through sub-bands to achieve higher performance, feeding back RPI and PI for each sub-band may bring greater feedback overhead.

Aiming at the problem of high overhead of feedback channel state information in the prior art, an effective solution is not provided in the related technology.

Disclosure of Invention

The embodiment of the invention provides a method, a device and a management device for feeding back channel state information, which are used for at least solving the problem of high overhead of feeding back the channel state information in the related technology.

According to an embodiment of the present invention, there is provided a feedback method of channel state information, including: determining the value of the configuration parameter; determining feedback information according to the value of the configuration parameter; feeding back the channel state information to a base station according to the feedback information, wherein a Precoding Matrix Indicator (PMI) in the channel state information comprises at least one of the following information: phase indicates PI and relative power indicates RPI.

According to another embodiment of the present invention, there is also provided a feedback apparatus of channel state information, including: the first determining module is used for determining the value of the configuration parameter; the second determining module is used for determining feedback information according to the value of the configuration parameter; a first feedback module, configured to feed back the channel state information to a base station according to the feedback information, where a precoding matrix indicator PMI in the channel state information includes at least one of the following information: phase indicates PI and relative power indicates RPI.

According to another embodiment of the present invention, there is also provided a feedback management apparatus of channel state information, including: a memory, and a processor coupled to the memory, the processor configured to execute a program, wherein the program when executed performs the method of any of the preceding claims.

According to the invention, the terminal determines the feedback information according to the determined value of the configuration parameter; and feeding back channel state information to the base station according to the feedback information, wherein a precoding matrix indicator PMI in the channel state information comprises at least one of the following information: phase indicates PI and relative power indicates RPI. Therefore, the terminal does not need to feed back all the channel state information, the problem of high cost of feeding back the channel state information in the related technology can be solved, and the effect of reducing the feedback cost is achieved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:

fig. 1 is a block diagram of a hardware structure of a mobile terminal of a feedback method of information status information according to an embodiment of the present invention;

FIG. 2 is a flow chart of a feedback method of information status information according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of the feedback principle of a linear combination codebook;

FIG. 4 is a schematic diagram of partial information feedback according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of partial information feedback according to an embodiment of the present invention (two);

FIG. 6 is a schematic diagram of partial PI feedback according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of partial PI feedback according to an embodiment of the present invention (two);

FIG. 8 is a schematic diagram of partial PI feedback according to an embodiment of the present invention (III);

FIG. 9 is a schematic diagram of partial RPI feedback according to an embodiment of the present invention;

FIG. 10 is a schematic diagram of partial RPI feedback according to an embodiment of the present invention;

fig. 11 is a block diagram of a feedback apparatus of channel state information according to an embodiment of the present invention.

Detailed Description

The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

The method provided by the first embodiment of the present application may be executed in a mobile terminal, a computer terminal, or a similar computing device. Taking the example of the method running on the mobile terminal, fig. 1 is a hardware structure block diagram of the mobile terminal of the feedback method of information status information according to the embodiment of the present invention. As shown in fig. 1, the mobile terminal 10 may include one or more (only one shown in fig. 1) processors 102 (the processor 102 may include, but is not limited to, a processing device such as a microprocessor MCU or a programmable logic device FPGA), a memory 104 for storing data, and a transmitting device 106 for communication functions. It will be understood by those skilled in the art that the structure shown in fig. 1 is only an illustration and is not intended to limit the structure of the electronic device. For example, the mobile terminal 10 may also include more or fewer components than shown in FIG. 1, or have a different configuration than shown in FIG. 1.

The memory 104 may be used to store software programs and modules of application software, such as program instructions/modules corresponding to the feedback method of information state information in the embodiment of the present invention, and the processor 102 executes various functional applications and data processing by running the software programs and modules stored in the memory 104, that is, implementing the above-mentioned method. The memory 104 may include high speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 104 may further include memory located remotely from the processor 102, which may be connected to the mobile terminal 10 via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.

The transmission device 106 is used for receiving or transmitting data via a network. Specific examples of the network described above may include a wireless network provided by a communication provider of the mobile terminal 10. In one example, the transmission device 106 includes a Network adapter (NIC), which can be connected to other Network devices through a base station so as to communicate with the internet. In one example, the transmission device 106 may be a Radio Frequency (RF) module, which is used for communicating with the internet in a wireless manner.

In this embodiment, a method for feeding back information status information is provided, and fig. 2 is a flowchart of a method for feeding back information status information according to an embodiment of the present invention, as shown in fig. 2, the flowchart includes the following steps:

step S202, determining the value of the configuration parameter;

step S204, determining feedback information according to the value of the configuration parameter;

step S206, feeding back the channel state information to the base station according to the feedback information, where a precoding matrix indicator PMI in the channel state information includes at least one of the following information: phase indicates PI and relative power indicates RPI.

Through the steps, the terminal determines the feedback information according to the determined value of the configuration parameter; and feeding back channel state information to the base station according to the feedback information, wherein a precoding matrix indicator PMI in the channel state information comprises at least one of the following information: phase indicates PI and relative power indicates RPI. Therefore, the terminal does not need to feed back all the channel state information, the problem of high cost of feeding back the channel state information in the related technology can be solved, and the effect of reducing the feedback cost is achieved.

Optionally, the main body of the above steps may be a terminal, but is not limited thereto.

In an alternative embodiment, the configuration parameters may include at least one of: the method comprises the following steps that (1) the initial position A of a resource block set, the number N of resource blocks RB contained in each resource block set, and the interval d of two adjacent resource block sets on a frequency band are set; wherein A, N and d are integers. In the present embodiment, the values of a, N, and d may be 0, 6, 6. Preferably, all configuration parameters are used for determining the feedback information. At least two values of N, d and A in PI and RPI can be configured jointly through signaling or a manner appointed by the base station and the terminal.

In an optional embodiment, determining the value of the configuration parameter may include at least one of: receiving a signaling sent by a base station, and determining the value of the configuration parameter from a preset configuration parameter set according to the signaling, wherein the preset configuration parameter set comprises a plurality of values of the configuration parameter; and determining the value of the configuration parameter according to a mode appointed with the base station. In this embodiment, the value of the configuration parameter may be determined by signaling alone, or by an agreed manner alone, or a part of the parameters in the configuration parameter may be determined by an agreed manner, and a part of the parameters is determined by signaling. For example, the initial position a of the resource block set in the configuration parameter may be determined by a signaling manner; the number N of resource blocks RB included in each resource block set in the configuration parameters, and the interval d between two adjacent resource block sets on the frequency band are determined by a convention method. The above-mentioned partial values of the configuration parameters may also be default values of the terminal or the base station. The scheme of determining the value of the configuration parameter in various modes increases the diversity of the value of the configuration parameter.

In an optional embodiment, when determining the value of the configuration parameter from the preset configuration parameter set according to the signaling, the signaling may include at least one of the following: RRC signaling of a radio resource control layer, MAC signaling of media access control and DCI signaling of downlink control information. In this embodiment, the values of N and d may be jointly determined by signaling, or at least two of N, d, and a may be determined by signaling.

In an optional embodiment, when determining the value of the configuration parameter from the preset configuration parameter set according to the signaling, the preset configuration parameter set may be formed by a base station and a terminal in an agreement. In this embodiment, the configuration parameter set may be in the form of a table, and a row or a column is taken from the table as a value of the configuration parameter. The configuration parameter set comprises values of a plurality of configuration parameters. And determining different numbers of feedback information according to values of different configuration parameters. The terminal only needs to feed back the feedback information with the number determined according to the value of the configuration parameter without feeding back all the channel state information, thereby saving the feedback overhead.

In an optional embodiment, determining the value of the configuration parameter may include: the value of d is derived from the implicit indication of N, wherein the implicit indication includes one of: when the value of N is more than or equal to Y₁When d is equal to Z₁(ii) a When the value of N is less than Y₁Then, the value of d is determined according to the signaling indicated by the base station; y is above₁And the above Z₁Are all integers. In this embodiment, the value of the configuration parameter is mainly determined according to the correspondence between d and N. Y is₁And Z₁The value of (a) may be preset or may be a default value.

In an optional embodiment, after feeding back the channel state information to the base station according to the feedback information, the method may further include: in the case that at least one of the following information is not included in the channel state information fed back to the base station: and in the case of a resource block on the lowest frequency band and a resource block on the highest frequency band, feeding back at least one of the following information by using the feedback bandwidth configuration of the feedback information and the channel state information: channel state information of the resource block on the lowest frequency band, and channel state information of the resource block on the highest frequency band. In this embodiment, it may be determined whether the feedback information includes a resource block on the lowest frequency band and a resource block on the highest frequency band by using the initial position a of the resource block set, the number N of resource blocks RB included in each resource block set, and the interval d between two adjacent resource block sets on the frequency band. The purpose of additionally feeding back the channel state information of the resource block on the lowest frequency band and the resource block on the highest frequency band is to increase the accuracy of interpolation. Interpolation is information for recovering resource blocks without feedback.

In an optional embodiment, before determining the feedback information according to the value of the configuration parameter, the method may further include: and determining the ratio of the interval of the two adjacent resource block sets in the RPI on the frequency band to the interval of the two adjacent resource block sets in the PI on the frequency band in a manner appointed by the base station.

In an optional embodiment, determining the value of the configuration parameter may include: the value of d is obtained by indicating the number P of the transmitting antenna ports of the base station, wherein when the value of P is more than or equal to Y₂When d is equal to Z₂(ii) a The above P, Y₂、Z₂Are all integers. In this embodiment, P, Y in the above₂May be preset or may be system default. P, Y₂、 Z₂The specific meanings of (A) are the same as those of (d). E.g. by presetting Y₂、Z₂Is 4, 3, 5, the value of d is 5.

In an optional embodiment, determining the value of the configuration parameter may include: the value of d and the value of N are determined by one of the following bandwidths: the system bandwidth of the base station, the system bandwidth supported by the terminal, and the reporting bandwidth of the channel state information CSI.

In an optional embodiment, determining the value of the configuration parameter includes: d is selected from the number of transmission layers Y₃Determining; when Y is₃When the value of (b) is R, the value of d is Z₃(ii) a When Y is₃When the value of (b) is greater than R, the value of d is Z₄(ii) a Wherein R, Y₃，Z₃，Z₄Are all integers, and Z₃Less than or equal to Z₄. In this embodiment, R, Z₃，Z₄Has the same specific meaning as d, R, Z₃，Z₄The value of (c) may be predefined or configured by the base station through signaling. For example, when R, Z₃，Z₄When the value of (d) is 5, 3 or 4, the value of d is 4. When Y is₃、R，Z₃，Z₄When the value of (d) is 6, 5, 3 or 4, the value of d is 4.

In summary, the value of the configuration parameter is determined in multiple ways, so that the accuracy of feeding back the channel state information is improved. When the linear combination codebook technology is used for feeding back the CSI, partial information is fed back, and the feedback overhead is effectively reduced.

The present invention will be described in detail with reference to the following specific examples:

in MIMO wireless communication, CSI feedback is a key technology for implementing high-performance beamforming and precoding. In the NR system, a linear combination codebook technology is used, and high-precision CSI feedback is obtained by linearly combining multipath information. One of the problems of the method is a large CSI feedback overhead, especially in a mode requiring subband CSI feedback, the CSI feedback overhead is large. The present embodiment aims to solve the problem of large CSI feedback when the CSI is fed back by using the linear combination codebook technique.

Detailed description of the preferred embodiment 1

This example shows a specific implementation of channel information feedback. In the method for feeding back CSI by using a linear weighted combination codebook, channel information measured by a terminal according to a reference signal is quantized into a linear combination of a plurality of beams, namely a precoding code word of each layer is linearly combined by a plurality of one-dimensional or two-dimensional DFT vectors. FIG. 3 is a schematic diagram of the feedback principle of a linear combination codebook, such as the selected beam vector c shown in FIG. 3₀，c₁And c₂The quantization feedback can be performed by conventional PMIs, and the coefficients for weighting and combining the PMIs include amplitude information λ₁、λ₂And phase information alpha₁、α₂The amplitude information can be quantized and fed back by selecting RPI, and the phase information can be quantized and fed back by selecting PI. Compared with the traditional PMI feedback of the single-path codebook, the feedback cost is greatly increased because the RPI and PI information corresponding to each beam needs to be fed back.

In general, since the frequency selectivity of beam information in a wireless channel is weak, in the linear combination codebook feedback, beam PMI information indicating a basis vector can be reported to a base station through wideband feedback. The phase of the weighting coefficient is mainly affected by factors such as delay, random phase and the like, and the frequency selectivity is strong, so that the PI needs sub-band feedback. For the amplitude information of the weighting coefficient, i.e. RPI, the wideband feedback can ensure better performance, and the subband feedback can further improve performance, but brings larger overhead, so that the wideband feedback or the subband feedback can be configured as required. In summary, high performance linear combination codebook feedback requires subband feedback of both RPI and PI of each beam.

In order to implement subband feedback of RPI and PI, it is a simpler way to feed back both RPI and PI corresponding to each subband, which may bring a larger performance overhead. This embodiment provides a subband feedback approach with reduced overhead.

The weighting phase coefficient indicated by the PI is mainly influenced by two factors, namely a random initial phase and phase change caused by time delay in a frequency domain. For a random initial phase, the phase change of each polarization direction can be regarded as a constant value on each subband, and for time delay, the phase change caused in the frequency domain can be regarded as linear change along with the frequency. Thus, the transformation of the phase indicated by the PI over different frequency bands can be modeled by a linear, piecewise linear, or other type of function. And for the amplitude information indicated by the RPI, the amplitude information is influenced by only a few tiny random factors on different frequency bands, and the whole amplitude information tends to be smooth. In summary, the indicated amplitudes and phases of the PI and the RPI corresponding to the same beam on different subbands have certain correlations.

According to the analysis, the correlation of the amplitude and phase coefficients indicated by the PI and the RPI on different sub-bands can be utilized to reduce the sub-band feedback overhead. A simple method is to feed back only partial RBs or subbands of RPI and PI without feeding back RPI and PI of each resource block.

For example, the CSI feedback bandwidth comprises K RBs in total, and the terminal feeds back S₀，S₁，...，S_M-1At least one of the following of the M sets of resource blocks: RPI and PI, each resource block set comprises N continuous RB, wherein M is more than or equal to 1 and less than or equal to K, and K, N and M are integers. d denotes the spacing of two adjacent resource block sets, e.g. the spacing of the indices of the first RB of two adjacent resource block sets, or two adjacent resource block setsThe interval of the sub-band index where each resource block set is located. For the former, let r be the index of the first RB in the jth resource block set_j,0Satisfy r_j+1,0-r_j,0D and r_0,0Where j is 0 ≦ M-2, j, d, and a are integers, and a is an integer multiple of N. As shown in fig. 4, a ═ 2, d ═ 6, and N ═ 2 are taken as examples; for the latter, a represents the subband index of the subband where the first resource block set is located, and as shown in fig. 5, a is 0, d is 2, and N is 2.

As can be seen from fig. 4 and 5, the terminal only needs to determine the values of a, N, and d to determine M pieces of feedback information. The terminal can determine the values of A, N and d in various ways:

the first method is as follows: and (4) signaling by the base station. The base station may inform the terminal through higher or physical layer signaling. E.g., RRC, MAC signaling to enable semi-static, semi-persistent configuration, or PHY signaling, e.g., DCI, to enable dynamic configuration.

The second method comprises the following steps: the agreed mode is that the terminal and the base station agree on the values of a, N and d. For example, the base station and the terminal always agree that a is 0, N is 6, and d is 12.

Mode three, the agreed mode. In this embodiment, the value of d represents the index interval of the subband in which two adjacent resource block sets are located. The values of d and N predetermined by the base station and the terminal may be determined by the system bandwidth, and it is agreed that the value of a is always equal to 0, wherein the system bandwidth is represented by the number of RBs contained, as shown in table 1, for the joint configuration of d and N:

TABLE 1

The method is as follows: the manner of hybrid configuration. The base station and the terminal appoint values of part of configuration parameters, and the values of the rest parameters are notified through signaling. For example, the base station always agrees that a is 0 with the terminal, and notifies the terminal N and d of their values through signaling. Specifically, the base station and the terminal first agree on X configuration sets regarding d and N, and then select one of the X configuration sets and notify the terminal through signaling. In addition, the value unit of N is RB, and the value unit of d is RB or subband. Taking X ═ 4 and the value unit of d is RB as an example, the configuration information is shown in table 2:

TABLE 2

Alternatively, taking X as 8 and d as an example of the subband index interval of the subband where the adjacent resource block set is located, the configuration information is shown in table 3.

TABLE 3

Signalling parameters	N	d
				0	2	2
1	2	4
			2	4	1
3	4	2
			4	4	4
5	6	1
			6	6	2
7	8	1

The fifth mode is as follows: the manner of hybrid configuration. In this embodiment, the value of d represents the subband index interval of the subband in which two adjacent resource block sets are located. The base station and the terminal appoint values of part of configuration parameters, and the values of the rest parameters are notified through signaling. For example, the base station and the terminal always agree that a is 0, and the value of N is equal to the number of RBs included in the subband configured by the system, and then the value of terminal d is signaled. Specifically, the base station and the terminal first agree on X configuration sets regarding d, and then one of the X configuration sets is selected and signaled to the terminal. Taking X ═ 3 as an example, the configuration information is shown in table 4.

TABLE 4

Signalling parameters	d
			0	1
1	2
		2	4

The method six: the manner of hybrid configuration. In this embodiment, the value of d represents the subband index interval of the subband in which two adjacent resource block sets are located. The base station and the terminal agree on values of part of configuration parameters, and the rest parameters can be determined by means of implicit indication and combined with base station signaling notification. For example, the base station and the terminal always agree that a is 0, and the value of N is equal to the number of RBs included in the subband configured by the system, and the value of d may be jointly determined by the value of N and joint base station signaling. For example, when N >6, the base station and the terminal always agree that the value of d is 1; when N is less than or equal to 6, the value of d is informed to the terminal through signaling. The specific configuration is shown in table 5.

TABLE 5

Specific example 2:

for the weighted phase coefficients indicated by PI, the transformation thereof over the different frequency bands can be modeled by linear, piecewise linear, or other types of functions. A simple method is to feed back only PI of part of resource blocks without feeding back each resource block RB or each sub-band or RPI and PI, and then recover PI of all resource blocks by interpolation. However, the use of interpolation algorithms avoids "extrapolation" phenomena, which helps to improve performance. The following describes in detail the implementation of the method to avoid the "extrapolation" phenomenon.

For example, the CSI feedback bandwidth comprises K RBs in total, and the terminal feeds back S₀，S₁，...，S_M-1At least one of the following of the M sets of resource blocks: RPI, PI, each resource block set contains N continuous RB, wherein M is more than or equal to 1 and less than or equal to K, and K, N and M are integers. Let the index of the first RB in the jth resource block set be r_j,0Satisfy r_j+1,0-r_j,0D and r_0,0Wherein j is 0. ltoreq. j.ltoreq.M-2, j, d and A are integers. As shown in fig. 3, a is 2, d is 6, and N is 2. As can be seen from FIG. 3, the set of resource blocks (dark gray portion in FIG. 3) to be selected for PI feedback can be determined by the values of A, d and N, and the PI of RB indexes 2 to K-5, the PI of the lowest frequency resource blocks 0 and 1, and the PI of the highest frequency resource blocks K-2 and K-1 can be obtained only by "extrapolation", which is usually not very accurate. In order to guarantee the performance of interpolation, the PI of the resource aggregation block in the lowest frequency band and the highest frequency band may be fed back additionally. As shown in fig. 6, the light gray portion represents the PI for additional feedback.

Specifically, after the terminal determines the values of a, d, and N, it can calculate whether the frequency band of the currently selected resource block set includes the lowest frequency band and the highest frequency band by using a, d, N, and K, and if the frequency band already includes the resource block of the lowest frequency band or already includes the resource block of the highest frequency band, no additional feedback is needed. For example, when a is 0, the resource block set determined by a, d, and N and the resource block set including the lowest frequency band are described, and then the PI of the resource block on the lowest frequency band does not need to be fed back additionally.

Specific example 3

Generally speaking, for a linear weighted combining codebook, the phase of a weighting coefficient is mainly affected by factors such as delay, random phase and the like, and the frequency selectivity is strong; for the amplitude information of the weighting coefficient, i.e. the RPI, the broadband feedback can ensure better performance, and the subband feedback can further improve the performance. For sub-band feedback, the correlation of RPI and PI in the frequency domain is not identical, so the feedback accuracy of RPI and PI can be configured separately according to the channel condition.

For example, the CSI feedback bandwidth contains K RBs in total, and for PI information: terminal feedback S₀，S₁，...，S_Mp-1This M_pPI of resource block sets, each resource block set comprising N_pOne continuous RB, wherein 1. ltoreq. M_p≤K，K，N_pAnd M_pIs an integer; let the index of the first RB in the jth resource block set be r_p,j,0Satisfy r_p,j+1,0-r_p,j,0＝d_pAnd r is_p,0,0＝A_pWherein j is more than or equal to 0 and less than or equal to M_p-2，j，d_pAnd A_pIs an integer, and A_pIs N_pInteger multiples of. With A_p＝0，d _p6 and N_pFig. 7 and 8 show an example of 2. For the same reason, for the RPI information, the terminal feeds back S₀，S₁，...， S_MR-1This M_RRPI of resource block sets, each resource block set including N_ROne continuous RB, wherein 1. ltoreq. M_R≤K，K，N_RAnd M_RIs an integer; note the index of the first RB in the jth resource Block setIs r_R,j,0Satisfy r_R,j+1,0-r_R,j,0＝d_RAnd r is_R,0,0＝A_RWherein j is more than or equal to 0 and less than or equal to M_R-2J, d and A_RIs an integer and A_RIs N_RInteger multiples of. With A_R＝0，d_RK/2 and N_RFig. 9 and 10 show an example of 4.

Compared with PI, RPI is less sensitive to frequency band changes, so that some limitation can be placed on the configuration of RPI feedback accuracy. The feedback accuracy of the PI and RPI may be configured in a number of ways:

the first method is as follows: PI and RPI are independently configured

The base station and the terminal firstly appoint X A_p，d_p，N_pIs used to indicate the feedback configuration of the PI, Y A_R，d_R，N_RIs used to indicate the feedback configuration of the RPI. The base station selects one of the X configurations through signaling and sends the selected configuration to the terminal, and selects one of the Y configurations and sends the selected configuration to the terminal. Taking X ═ 4 and Y ═ 2 as an example, the configuration information is shown in table 6(PI parameter configuration state table) and table 7(RPI parameter configuration state table).

TABLE 6

Signalling parameters	A_p	d_p	N_p
				0	0	6	6
1	0	12	1
				2	0	2	6
3	2	4	2

TABLE 7

Signalling parameters	A_R	d_R	N_R
				0	0	6	6
1	0	12	6

The second method comprises the following steps: PI and RPI Joint configuration

The base station and the terminal firstly appoint X A_p，d_p，N_p，A_R，d_RAnd N_RThen the base station selects one of the X configuration sets and informs the terminal through signaling, wherein X is an integer greater than or equal to 1. For example: when X is 4, the configuration set is as shown in table 8 (PI and RPI joint configuration state table when X is 4):

TABLE 8

In addition, another embodiment of the feedback signaling parameter jointly configured by the PI and the RPI is that the base station and the terminal determine the sub-band size N of the PI_pAnd subband size N of RPI_RThe relation between them, or, the number of spaced RBs or subbands d_pAnd d_RThe relationship between, or, the starting resource location A_pAnd A_RThe relationship between them. Further, the configured parameter is the RPI subband size N_RAnd N is_pAnd N_RThe proportional relationship between the two; alternatively, the RPI feedback interval R_BOr number of subbands d_RAnd d and_pand d_RThe proportional relationship between the two; or, starting resource location of RPI feedback, and A_pAnd A_RAn offset relationship therebetween.

The third method comprises the following steps: PI and RPI Joint configuration

In this embodiment, d_pSub-band index interval of sub-band where PI of two adjacent resource block sets is located, d_RAnd indicating the index interval of the sub-band of the RPI of the two adjacent resource block sets. The base station and the terminal agree on a parameter A related to PI _v0, parameter a for RPI_RIs equal to 0, and appoints N_pAnd N_RIs equal to the number of RBs comprised by the sub-band of the systemNumber, so only the parameter d needs to be determined_pAnd d_RThe value of (d) may determine the feedback granularity of the PI and RPI. Base station and terminal appoint X d pieces of d at the same time_pAnd d_RThen the base station selects one of the X configuration sets and informs the terminal through signaling, wherein X is an integer greater than or equal to 1. For example: when X is 4, the configuration set is as shown in table 9 (PI and RPI joint configuration state table when X is 4):

TABLE 9

Specific example 4

The feedback overhead of the weighted relative power indication RPI and the weighted phase coefficient indication is not only related to the bandwidth, but also to the transmission rank RI and whether the antenna is dual polarized or not. The RI reflects the number of layers of the transmission data stream, and when constructing the linear combining precoding, it is necessary to construct the precoding for the transmission data of each layer, so the size of the feedback overhead is almost linearly related to the size of the RI. Whether the antenna is dual polarized or not affects the construction of the precoding matrix. Taking RI as 2, dual-polarized antenna as an example, the linear weighted combining precoding matrix can be written as follows:

wherein c is_i(i ═ 0,1,2) is the DFT vector for linear weighted combining, λ_i(i＝1,2),α_i(i ═ 1,2) RPI and PI, λ, respectively, for the first polarization direction of the first layer_i(i＝3,4,5),α_i(i ═ 3,4,5) RPI and PI, μ for the first layer in the second polarization direction, respectively_i(i＝1,2),θ_i(i ═ 1,2) RPI and PI, μ for the first polarization direction of the second layer, respectively_i(i＝3,4,5),θ_i(i-3, 4,5) are RPI and PI, respectively, for the second polarization direction of the second layer. The feedback overhead can be reduced by using the correlation between transport layers and between polarizations.

Mode one (exploiting correlation of RPI between transport layers):

separately representing RPIs in precoded first and second layers as matrices Q₁＝[λ₁,λ₂,λ₃,λ₄,λ₅]And Q₂＝[μ₁,μ₂,μ₃,μ₄,μ₅]. With the correlation of RPI between transmission layers, RPI in the second layer of the precoding matrix can be obtained by multiplying the difference matrix M on the basis of RPI of the first layer:

Q₁and Q₂Each element in (1) is represented by k₁Bit quantization with k for each element in the matrix M₂Bits are quantized and k is made₂≤k₁. In general k is₁When Q is equal to 3₁And Q₂Each element in (a) is taken from a set

k₂When each element in M is taken from the set 1

Mode two (exploiting the correlation of PI between polarized antennas):

precoding PI in a first polarization direction and a second polarization direction as a matrix respectively

And

with the correlation of PI between polarized antennas, PI in the second polarization direction in the precoding matrix can be obtained by multiplying the difference matrix M on the basis of PI in the first polarization direction:

P₁each element in (1) is represented by k₁Bit quantization with k for each element in the matrix M₂Bits are quantized and k is made₂≤k₁. In general k is₁When P is equal to 3₁Parameter α in_i(i＝1,2),θ_i(i ═ 1,2) are all taken from the set

k₂Can be 1 or 2 when k is₂When 1, σ in M_i(

i

1, 2.. 6) are taken from the set {0, pi }, and when k is equal to₂When 2, σ in M_i(i ═ 1, 2.., 6) were taken from the set

In summary, the terminal feeds back the precoding matrix indicator PMI according to the configuration parameter, where the precoding matrix indicator includes at least one of: a phase indication PI and a relative power indication RPI; the configuration parameters include at least one of: the initial position A of the resource block set, the number N of RBs contained in each resource block set and the interval d of two adjacent resource block sets on a frequency band; wherein A, N and d are integers. The terminal can determine the value of the configuration parameter according to the base station signaling indication; the base station signaling can be high layer RRC signaling, MAC signaling or physical layer DCI signaling; the terminal receives the base station signaling, and selects corresponding configuration from a predefined configuration parameter state set according to the signaling; the configuration parameter table is appointed by the terminal and the base station; the parameters included in the configuration parameter status table include at least one of: the method comprises the following steps of determining an initial position A of a PI or RPI resource block set, wherein each resource block set comprises the number N of RBs, and the interval d of two adjacent resource block sets on a frequency band; configuring parameters in the parameter state set for jointly indicating initial positions A of at least two PI or RPI resource block sets of the following parameters, the number N of RBs contained in each PI or RPI resource block set, and the interval d of two PI or RPI adjacent resource block sets on a frequency band; configuring each parameter in a parameter state table for jointly indicating related feedback parameters of RPI and PI; the configuration parameter state set comprises parameters indicating RPI or PI related feedback parameters and the relation between the RPI and PI corresponding feedback parameters; the value of d may be implicitly indicated by the value of N; the terminal and the base station always agree on the values of A, N and d; the terminal and the base station agree to feed back at least one of the following resource block sets determined by A, N and d: besides RPI and PI, the resource assembly block with lowest frequency or the resource assembly block with highest frequency is fed back additionally, and at least one of the following is corresponded: RPI, PI; the resource set block of the additional feedback is the highest or lowest resource block set, and depends on the configuration of the CSI feedback bandwidth, and the resource block set terminal and the base station determined by A, N and d always agree that the interval of two adjacent resource block sets in the RPI parameter on the frequency band is more than or equal to the interval of two adjacent resource block sets in the PI parameter on the frequency band; the value of d may be implicitly indicated by the value of N.

Through the above description of the embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but the former is a better implementation mode in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.

In this embodiment, a feedback device of channel state information is further provided, and the device is used to implement the foregoing embodiments and preferred embodiments, and details are not repeated for what has been described. As used below, the term "module" may implement at least one of the following predetermined functions: a combination of software and hardware. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated.

Fig. 11 is a block diagram of a feedback apparatus of channel state information according to an embodiment of the present invention, as shown in fig. 11, the apparatus including: a first determination module 1102, a second determination module 1104, and a first feedback module 1106, which are described in detail below:

a first determining module 1102, configured to determine a value of a configuration parameter; a second determining module 1104, connected to the first determining module 1102, configured to determine feedback information according to a value of the configuration parameter; a first feedback module 1106, connected to the second determining module 1104, configured to feedback the channel state information to a base station according to the feedback information, where a precoding matrix indicator PMI in the channel state information includes at least one of the following information: phase indicates PI and relative power indicates RPI.

In an alternative embodiment, the configuration parameters may include at least one of: the method comprises the following steps that (1) the initial position A of a resource block set, the number N of resource blocks RB contained in each resource block set, and the interval d of two adjacent resource block sets on a frequency band are set; wherein A, N and d are integers.

In an optional embodiment, when determining a value of the configuration parameter from the preset configuration parameter set according to the signaling, the signaling includes at least one of: RRC signaling of a radio resource control layer, MAC signaling of media access control and DCI signaling of downlink control information.

In an alternative embodiment, the first determining module 1102 may include at least one of: a receiving unit, configured to receive a signaling sent by a base station, and determine a value of the configuration parameter from a preset configuration parameter set according to the signaling, where the preset configuration parameter set includes values of a plurality of the configuration parameters; and the determining unit is used for determining the value of the configuration parameter according to a mode appointed with the base station.

In an optional embodiment, determining the value of the configuration parameter may include at least one of: receiving a signaling sent by a base station, and determining a value of the configuration parameter from a preset configuration parameter set according to the signaling, wherein the preset configuration parameter set comprises a plurality of values of the configuration parameter; and determining the value of the configuration parameter according to a mode appointed with the base station.

In an optional embodiment, when determining the value of the configuration parameter from the preset configuration parameter set according to the signaling, the preset configuration parameter set is formed by a base station and a terminal in an agreement.

In an optional embodiment, determining the value of the configuration parameter includes: the value of d is derived from the implicit indication of N, wherein the implicit indication includes one of: when the value of N is more than or equal to Y₁When d is equal to Z₁(ii) a When the value of N is less than Y₁Then, the value of d is determined according to the signaling indicated by the base station; y is above₁And the above Z₁Are all integers.

In an optional embodiment, the apparatus may further include: a second feedback module, configured to, when the channel state information fed back to the base station does not include at least one of the following information: and in the case of a resource block on the lowest frequency band and a resource block on the highest frequency band, feeding back at least one of the following information by using the feedback bandwidth configuration of the feedback information and the channel state information: channel state information of resource blocks on the lowest frequency band, channel state information of resource blocks on the highest frequency band.

In an optional embodiment, the apparatus may further include: a third determining module, configured to determine, before determining feedback information according to the value of the configuration parameter, a ratio between an interval of two adjacent resource block sets in the RPI on a frequency band and an interval of two adjacent resource block sets in the PI on the frequency band in a manner agreed with the base station.

In an optional embodiment, the first determining module 1102 is further configured to obtain the value of d as indicated by a number P of transmit antenna ports of the base station, where P is greater than or equal to Y₂When d is equal to Z₂(ii) a The above P, Y₂、Z₂Are all integers.

In an optional embodiment, the first determining module 1102 may be further configured to determine the value of d and the value of N by one of the following bandwidths: the system bandwidth of the base station, the system bandwidth supported by the terminal, and the reporting bandwidth of the channel state information CSI.

In an optional embodiment, determining the value of the configuration parameter includes: d is selected from the number of transmission layers Y₃Determining; when Y is₃When the value of (b) is R, the value of d is Z₃(ii) a When Y is₃When the value of (b) is greater than R, the value of d is Z₄(ii) a Wherein R, Y₃，Z₃，Z₄Are all integers, and Z₃Less than or equal to Z₄。

An embodiment of the present invention further provides a storage medium including a stored program, where the program executes any one of the methods described above.

Alternatively, in the present embodiment, the storage medium may be configured to store program codes for performing the above steps.

Optionally, the storage medium is further arranged to store program code for performing the following steps.

Optionally, in this embodiment, the storage medium may include, but is not limited to: various media capable of storing program codes, such as a usb disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic disk, or an optical disk.

Embodiments of the present invention also provide a processor configured to execute a program, where the program executes to perform any of the steps in the method.

Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments and optional implementation manners, and this embodiment is not described herein again.

Optionally, this embodiment further provides a feedback management device for channel state information, including.

Signalling parameters

1. A method for feeding back channel state information, comprising:

determining the value of the configuration parameter;

determining feedback information according to the value of the configuration parameter;

feeding back the channel state information to a base station according to the feedback information, wherein a Precoding Matrix Indicator (PMI) in the channel state information comprises at least one of the following information: phase indication PI, relative power indication RPI;

the configuration parameters include at least one of:

the method comprises the following steps that (1) the initial position A of a resource block set, the number N of resource blocks RB contained in each resource block set, and the interval d of two adjacent resource block sets on a frequency band are set;

wherein A, N and d are integers.

2. The method of claim 1, wherein determining values of configuration parameters comprises at least one of:

receiving a signaling sent by a base station, and determining a value of a configuration parameter from a preset configuration parameter set according to the signaling, wherein the preset configuration parameter set comprises a plurality of values of the configuration parameter;

and determining the value of the configuration parameter according to a mode appointed with the base station.

3. The method according to claim 2, wherein when determining the value of the configuration parameter from the preset configuration parameter set according to the signaling, the signaling includes at least one of:

RRC signaling of a radio resource control layer, MAC signaling of media access control and DCI signaling of downlink control information.

4. The method of claim 2, wherein when determining the value of the configuration parameter from the preset configuration parameter set according to the signaling, the preset configuration parameter set is formed by a base station and a terminal in an agreement.

5. The method of claim 1, wherein determining values of configuration parameters comprises:

the value of d is obtained by the implicit indication of the value of N, wherein the implicit indication comprises one of the following:

when the value of N is more than or equal to Y₁When d is equal to Z₁；

When the value of N is less than Y₁Then, the value of d is determined according to the signaling indicated by the base station;

said Y is₁And said Z₁Are all integers.

6. The method of claim 1, further comprising:

in the case that at least one of the following information is not included in the channel state information fed back to the base station: and feeding back at least one of the following information by using the feedback information and the configuration of the feedback bandwidth of the channel state information: channel state information of the resource block on the lowest frequency band, and channel state information of the resource block on the highest frequency band.

7. The method of claim 1, wherein before determining feedback information according to a value of the configuration parameter, the method further comprises:

and determining the ratio of the interval of the two adjacent resource block sets in the RPI on the frequency band to the interval of the two adjacent resource block sets in the PI on the frequency band in a manner appointed by the base station.

8. The method of claim 1, wherein determining values of configuration parameters comprises:

the value of d is obtained by indicating the number P of transmitting antenna ports of the base station, wherein when the value of P is more than or equal to Y₂When d is aboveIs equal to Z₂；

The P, Y₂、Z₂Are all integers.

9. The method of claim 1, wherein determining values of configuration parameters comprises:

the value of d and the value of N are determined by one of the following bandwidths: the system bandwidth of the base station, the system bandwidth supported by the terminal, and the reporting bandwidth of the channel state information CSI.

10. The method of claim 1, wherein determining values of configuration parameters comprises:

the value of d is determined by the number of transmission layers Y₃Determining;

when said Y is₃When the value of (b) is R, the value of d is Z₃；

When said Y is₃When the value of (b) is greater than R, the value of d is Z₄；

Wherein, the R, Y₃，Z₃，Z₄Are all integers, and said Z₃Less than or equal to Z₄。

11. An apparatus for feeding back channel state information, comprising:

the first determining module is used for determining the value of the configuration parameter;

the second determining module is used for determining feedback information according to the value of the configuration parameter;

a first feedback module, configured to feed back the channel state information to a base station according to the feedback information, where a precoding matrix indicator PMI in the channel state information includes at least one of the following information: phase indication PI, relative power indication RPI;

the configuration parameters include at least one of:

wherein A, N and d are integers.

12. The apparatus of claim 11, wherein the first determining module comprises at least one of:

a receiving unit, configured to receive a signaling sent by a base station, and determine a value of a configuration parameter from a preset configuration parameter set according to the signaling, where the preset configuration parameter set includes values of a plurality of configuration parameters;

and the determining unit is used for determining the value of the configuration parameter according to a mode appointed with the base station.

13. The apparatus of claim 11, further comprising:

a second feedback module, configured to, when the channel state information fed back to the base station does not include at least one of the following information: and feeding back at least one of the following information by using the feedback information and the configuration of the feedback bandwidth of the channel state information: channel state information of the resource block on the lowest frequency band, and channel state information of the resource block on the highest frequency band.

14. The apparatus of claim 11, further comprising:

a third determining module, configured to determine, before determining feedback information according to the value of the configuration parameter, a ratio between an interval of two adjacent resource block sets in the RPI on a frequency band and an interval of two adjacent resource block sets in the PI on the frequency band in a manner agreed with the base station.

15. A feedback management apparatus for channel state information, comprising: a memory, and a processor coupled to the memory, the processor configured to execute a program, wherein the program when executed performs the method of any of claims 1-10.