JP2016189591A - Information feedback method, user apparatus, and base station - Google Patents

Abstract

Provided is a technique capable of enhancing information feedback and optimizing its technical scheme. The user equipment supports an aperiodic feedback mode having a maximum feedback overhead of 8N + 12 (N is the number of subbands). The number of CSI (channel state information) request bits is 1 and aperiodic reporting is triggered or the number of CSI request bits is 2 and a cell aperiodic reporting is triggered In this case, the maximum number of physical resource blocks (PRB) for the user apparatus to perform feedback is one of 5 to 8. [Selection] Figure 1

Description

  The present invention relates to the communication field, and more particularly, to an information feedback method, a user apparatus, and a base station that support enhancement of MIMO technology in LTE-A systems.

  In the LTE-A system, multi-input multi-output (MIMO) technology is introduced to improve system transmission reliability and system transmission speed using a system of multiple transmit antennas. To further improve system spectral efficiency, the system further supports multi-user multi-input multi-output (MU-MIMO) technology. A plurality of transmission antennas on the base station side provide services for a plurality of users with the same time-frequency resource.

  MU-MIMO needs to reduce interference between users by using a precoding technique and realize parallel transmission of user data streams. In order to select good precoding, the base station side obtains accurate downlink information, and in the FDD system, it is realized by user side feedback. The conventional 4-antenna system feeds back using a codebook structure of a single codeword. The MU-MIMO technology has a high demand for feed accuracy, and there is a compromise between feedback overhead and feedback accuracy in the system.

  Currently, there appears a double codebook that is different from the codebook of single codewords, which uses the characteristics of long-term and short-term changes in the system channel to quantize and feed back to the channel, of which W1 is Long-term wideband information is represented, and W2 represents short-term information. In a small-polarization dual-polarization antenna system, a codebook with a double-codebook structure uses antenna characteristics to obtain good feedback accuracy, and in a dual-polarization antenna system with a large spacing, the codeword of a conventional single antenna is Has good robustness. Thus, in the LTE R12 system, the base station may configure an appropriate codebook for the user based on the actual antenna configuration and transmission environment.

  A beam grid structure (GoB) is used for a 4-antenna double codebook. Among them, each column of W1 represents one beam direction, and the beam directions of different codewords of W1 have overlap. The number of codewords for W1 is 16 (for ranks 1 and 2), W2 represents a weighted combination of beam selection and different polarization antennas, and that codeword is 16 or 8 (currently still It has not been specifically determined).

For example, for rank R = 1, 2, the definition of W1 is as follows.

、Ｎ_１はＷ_１のｒａｎｋごとのコードワード数、例えば１６であり、Ｑ_１はＷ_１のビーム粒度であり、現在は未定である。ブロック対角マトリックスＸ_ｎについて、ＣＲは合計のビーム数、例えば４であり、ａ_１，ｎ，…，ａ_ＣＲ，ｎはビーム方向を決定するためのビーム係数である。 Here, X _n is one 2 × CR matrix, and is a row of a discrete Fourier transform (DFT) matrix, and (outside 1)

, N ₁ is the number of codewords per rank of W ₁ , eg, 16, and Q ₁ is the beam granularity of W ₁ and is currently undecided. For the block diagonal matrix X _n , CR is the total number of beams, for example 4, and a _{1, n} ,..., A _{CR, n} are beam coefficients for determining the beam direction.

Definition of W ₂ is as follows. W ₂ is one 2CR × R matrix and is as follows.

Among them, _{e i} is the one selected vectors, except the i-th row of elements is 1, 0 other elements together, _{N 2} is the number of codewords of each rank of _{W 2,} for example, 16 or 8 ( an undetermined), Q ₂ is the coefficient of the weighting vector on the two polarization directions.

For each a _r , y _r1 is a beam selection vector in the first polarization direction, y _r2 is a beam selection vector in the second polarization direction, m _r1 is a phase rotation in the first polarization direction, m _r2 is the phase rotation in the second polarization direction.

  For example, one implementation format is as follows.

For rank = 1,

For rank = 2,

  Meanwhile, LTE Rel. In 10 systems, periodic and aperiodic feedback schemes have been submitted to provide different granularity of feedback information for users and improve system performance.

  When the PMI / RI feedback is adopted for the transmission mode 9/10, the periodic feedback modes supported by the user include the mode 1-1, the mode 2-1, and the like.

  A user feeds back a rank indicator (RI, Rank Indication) and wideband precoding matrix indicator (PMI, Precoding Matrix Indicator) / channel quality indicator (CQI, Channel Quality Indicator) information using mode 1-1. If the system configures 8 antenna ports, it includes two submodes, of which the first frame of submode 1 feeds back the RI and wideband first precoding matrix indicator (PMI W1) and the second submode. The frame feeds back a wideband second precoding matrix indicator (PMI W2) and wideband CQI information. The first frame in submode 2 feeds back RI information, and the second frame feeds back wideband PMI W1, PMI W2 and CQI information.

  The user feeds back RI, wideband PMI / CQI, subband CQI, and subband label information using mode 2-1. When the system configures eight antenna ports, the first frame feeds back RI and PTI (Precoding Type Indication) information, and when PTI = 0, the second subframe feeds back wideband PMI W1 information, The third subframe feeds back wideband PMI W2 and wideband CQI information. When PTI = 1, the second subframe feeds back wideband PMI W2 and wideband CQI information, and the third subframe The subband PMI W2, the subband CQI information, and the subband label information are fed back.

表１

表２
For aperiodic feedback, if the user feeds back using PMI / RI, supported aperiodic feedback modes include mode 1-2, mode 2-2, and mode 3-1. Among them, mode 1-2 corresponds to the wideband CQI and subband PMI feedback mode, and mode 2-2 is a feedback mode in which the wideband PMI, CQI and the user selects the best M subband PMI, CQI. Correspondingly, mode 3-1 corresponds to wideband PMI and subband CQI feedback mode. Among them, the feedback contents of the aperiodic feedback mode 3-1 are shown in Tables 1 and 2, and correspond to the feedback contents in the case of 2/4 antenna port and 8 antenna port, respectively.

Table 1

Table 2

  In the case of aperiodic feedback, the bit cascade order is cascaded in the order of bit information of each field, and when there are a plurality of subband information in the field, cascade is performed in descending order of the subband label information.

表３

表４
The RAN1 72b conference introduces a new aperiodic feedback mode 3-2 to the enhanced MIMO system, which includes 4-bit wideband CQI information, 2-bit differential CQI information for each subband, wideband PMI1 information, Contains PMI2 information of subbands. The relevant conclusion of the aperiodic feedback mode 3-2 is that the PMI / CQI subband granularity is the same and is the same as the conventional standard definition. Among them, the differential CQI coding scheme and the system feedback wideband configuration are shown in Tables 3 and 4.

Table 3

Table 4

  When a user reports using PMI / RI, the transmission mode 8, 9, 10 based on DM-RS may configure the aperiodic feedback mode 3-2, and the R8 codebook (ie, single codeword When the code book) is used, the aperiodic transmission mode 3-2 may be configured by the transmission modes 4 and 6.

  However, according to the discovery of the inventor of the present invention, there is a compromise between feedback overhead and system performance gain, but conventionally, the technical scheme of information feedback for MIMO has not been fully optimized.

  It should be noted that the above description regarding the background art is merely for explaining the technical solution of the present invention more clearly and completely, and is intended to allow those skilled in the art to understand. Since these technical solutions are described in the background section of the present invention, they should not be construed as techniques well known to those skilled in the art.

  Embodiments of the present invention aim to provide an information feedback method, a user apparatus, and a base station that enhance information feedback in MIMO and further optimize the technical scheme of information feedback.

  In one aspect of an embodiment of the present invention, a method for transmitting uplink control information, wherein a user equipment supports an aperiodic feedback mode 3-2, the transmission method includes a CSI (channel state information) request. When the number of bits is 1 and an aperiodic report is triggered, the maximum number of PRBs (physical resource blocks) for the user equipment to perform feedback is one of 5 to 8, or a CSI request A method is provided in which the maximum number of PRBs for the user equipment to perform feedback is one of 5 to 8 when the number of bits of A is 2 and an aperiodic report of one cell is triggered To do.

  In another aspect of an embodiment of the present invention, a method for configuring uplink control information, wherein a user equipment supports aperiodic feedback mode 3-2, the method comprising: a CSI (channel state information) request If the number of bits is 1 and an aperiodic report is triggered, the maximum number of PRBs (physical resource blocks) for feedback configured for the user equipment by the base station is set to 1 out of 5-8 Or if the number of CSI request bits is 2 and an aperiodic reporting of one cell is triggered, the maximum number of feedback PRBs configured for the user equipment by the base station is A method is provided which is one of 5 to 8.

  In another aspect of an embodiment of the present invention, an information feedback method, wherein when a base station configures a CSI (channel state information) process of a reference rank indicator for the user equipment, the user equipment A method is provided that does not expect to receive signaling to configure different codebooks for the CSI process of the link and the CSI process of the link.

  In another aspect of an embodiment of the present invention, an information configuration method, wherein a base station configures the same codebook as a CSI process of a link for a CSI (channel state information) process of a reference rank indicator of a user equipment. To provide a method.

  In another aspect of an embodiment of the present invention, an information feedback method is provided, wherein the user equipment supports the periodic feedback mode 2-1, and a double codebook is used, and the information feedback method includes a PMI (precoding matrix). If the subband granularity of the indicator) and the subband granularity of the CQI (channel quality indicator) are different, the user equipment provides a method of selecting the smaller subband granularity as the subband granularity of the joint of PMI and CQI.

  In another aspect of the embodiment of the present invention, an information feedback method is provided in which a user apparatus uses a double code book, and the user apparatus performs sub-mode 1 of periodic feedback mode 1-1. If used and the rank is 1 or 2, a method is provided for limiting the size of the wideband first PMI (precoding matrix indicator) to 3 bits or less.

  In another aspect of an embodiment of the present invention, an information feedback method is provided, wherein when the user equipment uses the periodic feedback mode 2-1, the subband in the third frame is used using 11 bits. A method is provided for feeding back 2 PMI (Precoding Matrix Indicator), subband CQI (Channel Quality Indicator) and subband label information.

  In another aspect of the embodiment of the present invention, an information feedback method is provided in which a user apparatus uses a double code book, and the user apparatus performs sub-mode 2 of the periodic feedback mode 1-1. When used, a method is provided that limits the wideband first PMI (precoding matrix indicator) to 3 bits or less.

  In another aspect of an embodiment of the present invention, there is an information feedback method, in which the user equipment uses one frame to perform subband PMI (precoding matrix indicator), subband CQI (channel quality indicator). ) And feedback of subband label information.

  In another aspect of the embodiment of the present invention, there is provided an information feedback method, in which the user apparatus performs feedback after adjustment of the user apparatus based on instruction information for the base station to indicate feedback granularity. A method is provided for reporting the indication information to the base station so as to obtain a granularity.

  In another aspect of the embodiment of the present invention, the user equipment includes feedback means that feeds back using the aperiodic feedback mode 3-2, and the number of bits of the CSI (channel state information) request is 1. And when aperiodic reporting is triggered, the maximum number of PRBs (physical resource blocks) for feedback is one of 5 to 8, or the number of bits of the CSI request is 2, and 1 If a non-periodic reporting of one cell is triggered, the user equipment is provided with a maximum number of PRBs for feedback of one of 5-8.

  In another aspect of the embodiment of the present invention, the base station includes a configuration unit configured to perform resource configuration when the user apparatus supports the aperiodic feedback mode 3-2, and includes a CSI (channel state information) request. If the number of bits is 1 and an aperiodic report is triggered, the maximum number of PRBs (physical resource blocks) for feedback configured for the user equipment is one of 5 to 8 Or if the number of bits in the CSI request is 2 and an aperiodic reporting of one cell is triggered, the maximum number of feedback PRBs configured for the user equipment is between 5 and 8 One base station is provided.

  In another aspect of an embodiment of the present invention, a user equipment, wherein a base station configures a CSI (channel state information) process of a reference rank indicator for the user equipment, the CSI process and link of the reference rank indicator User equipment is provided that includes feedback means that do not expect to receive signaling to configure different codebooks for different CSI processes.

  In another aspect of an embodiment of the present invention, the base station includes a component that configures the same codebook as the CSI process of the link for the CSI (channel state information) process of the reference rank indicator of the user equipment Provide a base station.

  In another aspect of an embodiment of the present invention, the user equipment includes a feedback means that uses the periodic feedback mode 2-1 and feeds back by using a double codebook, and is a sub-prediction of PMI (precoding matrix indicator). Provided is a user apparatus that selects a smaller subband granularity as a subband granularity of a joint of PMI and CQI when the band granularity and the subband granularity of CQI (channel quality indicator) are different.

  In another aspect of the embodiment of the present invention, the user equipment includes feedback means for feedback using the submode 1 of the periodic feedback mode 1-1, and when the rank is 1 or 2, Provided is a user apparatus that limits the size of 1 PMI (precoding matrix indicator) to 3 bits or less.

  In another aspect of the embodiment of the present invention, the user equipment includes feedback means for performing feedback using the periodic feedback mode 2-1, and uses 11 bits for subband second PMI (precoding in the third frame). A user equipment that feeds back a matrix indicator), subband CQI (channel quality indicator) and subband label information is provided.

  In another aspect of the embodiment of the present invention, when the user apparatus performs feedback using the submode 2 of the periodic feedback mode 1-1, the wideband first PMI (precoding matrix indicator) is set to 3 bits or less. User equipment including feedback means for limiting is provided.

  In another aspect of an embodiment of the present invention, a user equipment that feeds back subband PMI (precoding matrix indicator), subband CQI (channel quality indicator) and subband label information using one frame. User equipment including means is provided.

  In another aspect of the embodiment of the present invention, the base station is a user equipment, so that the base station acquires the feedback granularity after adjustment of the user equipment based on instruction information for indicating the feedback granularity. There is provided a user apparatus including feedback means for reporting the instruction information.

  In another aspect of an embodiment of the present invention, a communication system including the above-described user apparatus and the above-described base station is provided.

  In another aspect of an embodiment of the present invention, a computer-readable program is provided that causes a computer to execute the above information feedback method on the user device when the user device executes the program.

  In another aspect of an embodiment of the present invention, a storage medium is provided for storing a computer-readable program for causing a computer to execute the above-described information feedback method on a user device.

  In another aspect of the embodiment of the present invention, there is provided a computer-readable program for causing a computer to execute the above information configuration method in the base station when the program is executed in the base station.

  In another aspect of the embodiment of the present invention, there is provided a storage medium for storing a computer-readable program for causing a computer to execute the above information configuration method in a base station.

  As a beneficial effect of the embodiment of the present invention, information feedback in MIMO can be enhanced, and the technical scheme of information feedback can be further optimized.

  As shown in the following description and drawings, specific embodiments of the present invention are disclosed in detail and show the manner in which the principles of the invention can be employed. The scope of the embodiment of the present invention is not limited to these. The embodiments of the present invention include changes, modifications and equivalents within the spirit and scope of the appended claims.

  Features described and / or illustrated features in one embodiment may be used in one or more other embodiments in the same or similar manner, and may be combined with features in other embodiments. It may replace the feature in other embodiments.

  In this context, the term “include / include” refers to the presence of a feature, member, step or component and does not exclude the presence or addition of one or more other features, members, steps or components.

  Many aspects of the invention can be understood with reference to the following drawings. Elements in the drawings are not drawn to scale but are for illustrating the principles of the invention. Corresponding parts in the drawings may be enlarged or reduced in order to show or describe a part of the invention.

Elements and features described in one drawing and one embodiment of the invention may be combined with elements and features shown in one or more drawings or embodiments. In the drawings, like numerals indicate corresponding elements in the drawings, and may indicate corresponding elements used in one or more embodiments.
It is one flowchart of the transmission method of the uplink control information of Example 1 of this invention. It is another flowchart of the transmission method of the uplink control information of Example 1 of this invention. It is another flowchart of the transmission method of the uplink control information of Example 1 of this invention. It is another flowchart of the transmission method of the uplink control information of Example 1 of this invention. It is a figure which shows one structure of the user apparatus of Example 1 of this invention. It is another flowchart of the structure method of the uplink control information of Example 1 of this invention. It is another flowchart of the structure method of the uplink control information of Example 1 of this invention. It is another flowchart of the structure method of the uplink control information of Example 1 of this invention. It is another flowchart of the structure method of the uplink control information of Example 1 of this invention. It is a figure which shows one structure of the base station of Example 1 of this invention. It is one flowchart of the information feedback method of Example 2 of this invention. It is a figure which shows one structure of the user apparatus of Example 2 of this invention. It is another flowchart of the information structure method of Example 2 of this invention. It is a figure which shows one structure of the base station of Example 2 of this invention. It is one flowchart of the information feedback method of Example 3 of this invention. It is a figure which shows one structure of the user apparatus of Example 3 of this invention. It is one flowchart of the information feedback method of Example 4 of this invention. It is another flowchart of the information feedback method of Example 4 of this invention. It is another flowchart of the information feedback method of Example 4 of this invention. It is a figure which shows one structure of the user apparatus of Example 4 of this invention. It is one flowchart of the information feedback method of Example 5 of this invention. It is a figure which shows one structure of the user apparatus of Example 5 of this invention. It is one flowchart of the information feedback method of Example 6 of this invention. It is a figure which shows changing the feedback precision of Example 6 of this invention. It is a figure which shows one structure of the user apparatus of Example 6 of this invention. It is one flowchart of the information structure method of Example 6 of this invention. It is a figure which shows one structure of the base station of Example 6 of this invention. It is a figure which shows one structure of the communication system of Example 6 of this invention.

  The above and other features of the present invention will be described with reference to the drawings. As shown in the following description and drawings, specific embodiments of the present invention are disclosed in detail and some of the embodiments that can employ the principles of the present invention are shown. The scope of the embodiment of the present invention is not limited to these. The embodiments of the present invention include changes, modifications and equivalents within the spirit and scope of the appended claims.

<Example 1>
The embodiment of the present invention provides a method for transmitting uplink control information, which will be described from the angle on the user equipment side. The user equipment uses aperiodic feedback mode 3-2. The present embodiment is applied to a physical uplink shared channel (PUSCH, physical uplink shared channel) that performs only transmission of uplink control information (UCI, Uplink Control Information).

  FIG. 1 is a flowchart of an uplink control information transmission method according to an embodiment of the present invention. As shown in FIG. 1, the uplink control information transmission method includes the following steps.

  Step 101: When the number of bits of the channel state information (CSI, Channel State Information) request is 1 and an aperiodic report is triggered, a physical resource block (PRB, Physical Resource Block) for the user apparatus to perform feedback ) Is one of 5 to 8.

  FIG. 2 is another flowchart of a method for transmitting uplink control information according to an embodiment of the present invention. As shown in FIG. 2, the uplink control information transmission method includes the following steps.

  Step 201: If the number of bits of the CSI request is 2 and an aperiodic report of one cell is triggered, the maximum number of PRBs for user equipment to perform feedback is set to one of 5 to 8 .

  Here, the maximum number of feedback PRBs when the number of CSI request bits is 1 and aperiodic reporting is triggered is 2 for CSI request bits and the aperiodicity of one cell. If the report is triggered, it is the same as the maximum number of PRBs for feedback, and if the maximum number of PRBs for the user equipment to provide feedback is one of 5 to 8, preferably 5 or 6 There may be.

  FIG. 3 is another flowchart of the uplink control information transmission method according to the embodiment of the present invention. As shown in FIG. 3, the uplink control information transmission method includes the following steps.

  Step 301: If the number of bits of CSI request is 2 and aperiodic reporting of multiple cells is triggered, the maximum number of PRBs for user equipment to perform feedback is set to one of 25 to 40 .

  FIG. 4 is another flowchart of the uplink control information transmission method according to the embodiment of the present invention. As shown in FIG. 4, the uplink control information transmission method includes the following steps.

  Step 401: If the number of bits of a CSI request is 2 and a non-periodic reporting of multiple CSIs is triggered, the maximum number of PRBs for user equipment to perform feedback is set to one of 25 to 40 .

  Here, the maximum number of feedback PRBs when the number of CSI request bits is 2 and when aperiodic reporting of multiple cells is triggered is 2 for CSI request bits and multiple CSI requests. Is the same as the maximum number of PRBs for feedback when the non-periodic report is triggered, and the maximum number of PRBs for the user equipment to provide feedback is preferably one of 25 to 40 One of 25, 30 to 32 may be used.

表５
In this embodiment, when the user equipment configures transmission mode 9 or 10, PMI / RI report, and uses a double codebook, the subband second PMI has a rank of 1 or 2 for 4-antenna port feedback. in a _K 1 _{N 2} bits, the rank is _K 2 _{N 2} bits at the time of 3, rank is _K 3 _{N 2} bits at 4, of _which, K 1, _{K 2} and _{K 3} are double code is a constant which is determined by the size of the book W2, N ₂ is the number of subbands PMI. Specifically, those shown in Table 5 may be used.

Table 5

Of these, preferably K ₁ = K ₂ = K ₃ = 4, or K ₁ = K ₂ = 4, K ₃ = 3. In addition, this invention is not limited to this, You may use another numerical value.

表６
In this example, if the user equipment configures transmission mode 8, 9 or 10, and PMI / RI report, for 8 antenna port feedback, the subband differential CQI codeword 0 is when the rank is 1 to 8 2N ₁ bit, the subband differential CQI codeword 1 is 2N ₁ bit when the rank is 2 to 8, and the subband second PMI is 4N ₂ bit when the rank is 1 to 3, 4 is 3N ₂ bits, of which N ₁ is the number of subbands of CQI and N ₂ is the number of subbands of PMI.

Table 6

Of these, preferably, N ₁ = N ₂ and may be consistent with the R10 standard definition. In addition, about the numerical value in Table 5 and Table 6, this invention is not limited to this, You may adjust according to an actual condition.

  In the present embodiment, the maximum number of feedback PRBs may be calculated based on the size of the subband second PMI or the number of subbands. Also, the maximum number of feedback PRBs is equal to or less than the number of uplink resource PRBs configured for the user equipment by the base station.

表７
Accordingly, the maximum feedback overhead of the aperiodic feedback mode 3-2 is 8N + 12, where N is the number of subbands. Table 7 shows the maximum feedback overhead situation for several feedback modes.

Table 7

Of these, N is the number of subbands, and L is related to the number of subband selections. For example, the number of bits for selecting M subbands from N is L = log ₂ (C ^M _N ).

、モード３−２の最大フィードバックオーバーヘッドは８＊１３＋１２＝１１６ビットであり、一方、既存のフィードバックモード、例えばモード３−１の最大フィードバックオーバーヘッドは４＊１３＋１６＝６８である。よって、モード３−２のフィードバックオーバーヘッドは０．７倍増加し、ＰＵＳＣＨを用いてＣＱＩ／ＰＭＩ情報のみを伝送する場合、最大でサポートされた帯域幅が４ＰＲＢであり、一方、フィードバックモード３−２を導入した後に、フィードバックオーバーヘッドは０．７倍増加し、性能の要求を満たすため２〜３ＰＲＢを増加する必要がある。 In this embodiment, for example, when the system bandwidth is 20M,

The maximum feedback overhead for mode 3-2 is 8 * 13 + 12 = 116 bits, while the maximum feedback overhead for existing feedback modes, eg mode 3-1, is 4 * 13 + 16 = 68. Therefore, the feedback overhead of mode 3-2 is increased by a factor of 0.7, and when only CQI / PMI information is transmitted using PUSCH, the maximum supported bandwidth is 4 PRB, while feedback mode 3-2 After introducing, the feedback overhead increases by a factor of 0.7, and it is necessary to increase 2-3 PRBs to meet performance requirements.

In other words, when the user can support mode 3-2, the maximum configuration PRB is 6 to 7 PRB, and only control information is transmitted by PUSCH. Considering the status of the carrier aggregation and a plurality of channel state information (CSI, Channel State Information) processes, the maximum number of PRBs in this embodiment is as follows. If the “CSI request” bit number is 1 bit and an aperiodic report is triggered, the maximum N _PRB ≦ 5-8 (eg 5 or 6), or the “CSI request” bit number is 2 bits, And if non-periodic reporting of one cell is triggered, N _PRB ≦ 5-8 (for example, 5 or 6), or the number of “CSI request” bits is 2 bits, and non-periodic reporting of multiple cells N _PRB ≦ 25-40 (for example, 25, 30 or 32), or “CSI request” bit number is 2 bits and multiple CSI aperiodic reports are triggered, N N _PRB ≦ 25-40 (eg 25, 30 or 32).

  The following describes the effect after increasing PRB. For the UCI-only PUSCH, the sounding reference signal (SRS, Sounding Reference Symbol) in the PUSCH occupies one SC-FDMA symbol, and the HARQ ACK / NACK feedback information occupies four SC-FDMA symbols (maximum duplication possible) ), The rank indicator (RI) information occupies 4 SC-FDMA symbols (when maximum overlap is possible), and the modulation scheme is assumed to be QPSK.

表８ ＵＣＩ−ｏｎｌｙの場合のＱＰＳＫコードレート（通常ＣＰ）

表９ ＵＣＩ−ｏｎｌｙの場合のＱＰＳＫコードレート（拡張ＣＰ）
For normal cyclic prefix (CP, cyclic prefix) subframes, Table 8 shows QPSK code rate information for UCI-only, and for extended CP subframes, Table 9 shows QPSK code rate information for CQI-only. ing.

Table 8 QPSK code rate (normal CP) for UCI-only

Table 9 QPSK code rate (extended CP) for UCI-only

  As can be seen from Table 8, in the case of the normal CP, if it is expanded to 6 RBs, all multiplexing conditions can be secured, the system code rate is smaller than 1/3, and the system performance requirement defined in R8 is reached. Yes. As can be seen from Table 9, in the case of extended CP, if the UCI-only PRB is extended to 6 RBs, an acceptable code rate can be obtained, which basically satisfies the performance requirements of R8.

  The embodiment of the present invention further provides a user apparatus, and FIG. 5 is a diagram showing one configuration of the user apparatus of the embodiment of the present invention. As illustrated in FIG. 5, the user device 500 includes a feedback unit 501, and other components of the user device 500 may refer to the related art.

  The feedback unit 501 performs feedback using the aperiodic feedback mode 3-2. If the number of bits in the CSI request is 1 and an aperiodic report is triggered, the maximum number of PRBs for feedback is one of 5 to 8, or the number of bits in the CSI request is 2 And if the aperiodic reporting of one cell is triggered, the maximum number of PRBs for feedback is one of 5 to 8, or the number of bits in the CSI request is two, And when aperiodic reporting of multiple cells is triggered, the maximum number of PRBs for feedback is one of 25 to 40, or the number of bits in the CSI request is 2, and When CSI aperiodic reporting is triggered, the maximum number of PRBs for feedback is one of 25-40.

  Embodiments of the present invention further provide a method for configuring uplink control information. This will be described from the angle on the base station side. Here, the user apparatus uses an aperiodic feedback mode 3-2.

  FIG. 6 is a flowchart of one method of configuring uplink control information according to an embodiment of the present invention. As shown in FIG. 6, the configuration method of the uplink control information includes the following steps.

  Step 601: If the number of bits of the CSI request is 1 and an aperiodic report is triggered, the maximum number of feedback PRBs configured for the user equipment by the base station is set to 1 out of 5-8 I will.

  FIG. 7 is another flowchart of a method for configuring uplink control information according to an embodiment of the present invention. As shown in FIG. 7, the method for configuring uplink control information includes the following steps.

  Step 701: If the number of bits of the CSI request is 2 and an aperiodic report of one cell is triggered, the maximum number of feedback PRBs configured for the user equipment by the base station is set to 5 to 8 One of them.

  FIG. 8 is another flowchart of the method for configuring uplink control information according to the embodiment of the present invention. As shown in FIG. 8, the configuration method of the uplink control information includes the following steps.

  Step 801: If the number of bits of the CSI request is 2 and a non-periodic reporting of multiple cells is triggered, the maximum number of feedback PRBs configured for the user equipment by the base station is 25 to 40. One of them.

  9 is another flowchart of the configuration method of the uplink control information of the embodiment of the present invention. As shown in FIG. 9, the configuration method of the uplink control information includes the following steps.

  Step 901: If the number of bits of the CSI request is 2 and multiple CSI aperiodic reports are triggered, the maximum number of feedback PRBs configured for the user equipment by the base station is set to 25 to 40 One of them.

  The embodiment of the present invention further provides a base station, and FIG. 10 is a diagram showing one configuration of the base station of the embodiment of the present invention. As shown in FIG. 10, the base station 1000 may include a configuration unit 1001, and other configuration units of the base station 1000 may refer to the related art.

  The configuration unit 1001 performs resource configuration when the user apparatus uses the aperiodic feedback mode 3-2. If the number of CSI request bits is 1 and an aperiodic report is triggered, the maximum number of PRBs for feedback configured for the user equipment is one of 5 to 8, or CSI If the requested number of bits is 2 and an aperiodic reporting of one cell is triggered, the maximum number of PRBs for feedback configured for the user equipment is one of 5 to 8 Or if the number of bits in the CSI request is 2 and the aperiodic reporting of multiple cells is triggered, the maximum number of feedback PRBs configured for the user equipment is 1 out of 25-40 Or the number of CSI request bits is 2 and multiple CSI aperiodic reports are triggered, the maximum number of feedback PRBs configured for the user equipment is 2 From is one of 40.

  According to the above embodiment, information feedback in MIMO can be enhanced, and a technical scheme of information feedback can be further optimized.

<Example 2>
The embodiment of the present invention provides an information feedback method and will be described from the angle on the user device side. FIG. 11 is a flowchart of an information feedback method according to an embodiment of the present invention. As shown in FIG. 11, the information feedback method includes the following steps.

  Step 1101: If the base station configures the CSI process of the reference rank indicator for the user equipment, the user equipment sends signaling to configure different codebooks for the CSI process of the reference rank indicator and the CSI process of the link. Do not expect to receive.

  According to the conclusion of the current conference, the base station may independently configure the codebook used by the user based on each CSI process. If the base station needs to perform joint transmission based on feedback information of multiple CSI processes, configure an RI reference process for the user. By configuring the RI reference process, the realization on the base station side was simplified. Configuring different codebooks for different CSI processes resulted in additional test complexity. Also, the impact on system performance of two independently designed codebooks in joint transmission cannot be determined.

  Therefore, in this embodiment, user actions are defined. When configuring the reference RI process, the user equipment does not expect the base station to configure different codebooks for the reference RI CSI process and the link CSI process. That is, the user equipment feeds back using the same codebook as the CSI process of the link configured for the CSI process of the reference RI by the base station. In other words, the base station configures the codebook of the link CSI process based on the codebook of the CSI process of the reference RI.

  The embodiment of the present invention further provides a user apparatus, and FIG. 12 is a diagram showing one configuration of the user apparatus of the embodiment of the present invention. As shown in FIG. 12, the user apparatus 1200 includes a feedback unit 1201, and other components of the user apparatus 1200 may refer to the related art.

  When the base station configures the reference rank indicator CSI process for the user equipment, the feedback unit 1201 performs signaling for the user equipment to configure different codebooks for the reference rank indicator CSI process and the link CSI process. Do not expect to receive.

  The embodiment of the present invention further provides an information configuration method and will be described from the angle on the base station side. FIG. 13 is a flowchart of an information configuration method according to an embodiment of the present invention. As shown in FIG. 13, the information configuration method includes the following steps.

  Step 1301: The base station configures the same codebook as the CSI process of the link for the CSI process of the reference rank indicator of the user equipment.

  The embodiment of the present invention further provides a base station, and FIG. 14 is a diagram showing one configuration of the base station of the embodiment of the present invention. As shown in FIG. 14, the base station 1400 may include a configuration unit 1401, and other configuration units of the base station 1400 may refer to the related art.

  The configuration unit 1401 configures the same codebook as the CSI process of the link for the CSI process of the reference rank indicator of the user equipment.

  According to the above embodiment, information feedback in MIMO can be enhanced, and a technical scheme of information feedback can be further optimized.

<Example 3>
The embodiment of the present invention provides an information feedback method and will be described from the angle on the user device side. The user equipment uses the periodic feedback mode 2-1, and uses a double codebook.

  FIG. 15 is a flowchart of an information feedback method according to the third embodiment of the present invention. As shown in FIG. 15, the information feedback method includes the following steps.

  Step 1501: If the PMI subband granularity and the CQI subband granularity are different, the user apparatus selects a smaller subband granularity as the PMI and CQI joint subband granularity.

  In this embodiment, when the feedback granularities of the subband PMI and the CQI do not match, when using a new codebook (ie, double codebook), the periodic feedback mode 2-1 uses the subband PMI, CQI, and subband label. Information feedback may also be included. Among them, PMI corresponds to subband PMI W2, and CQI corresponds to subband CQI. If the PMI and CQI subband granularities are different, a smaller subband granularity may be selected as the PMI / CQI joint subband granularity.

  Specifically, when the CQI subband granularity is smaller than the PMI subband granularity, the CQI subband index information is increased.

  For example, when the CQI granularity is 1 times smaller than the PMI granularity, their feedback formats are PMI / CQI / PMI subband index, CQI / CQI subband index 1, and subband index 2. Therefore, it is necessary to define new feedback types CQI / CQI subband index 1 and subband index 2. However, the current protocol supports only CQI / CQI subband index 1.

  That is, subband PMI, subband CQI, and PMI subband label information may be fed back in one frame, and subband CQI and CQI subband label information may be indicated in another frame.

  The embodiment of the present invention further provides a user apparatus, and FIG. 16 is a diagram showing one configuration of the user apparatus of the embodiment of the present invention. As shown in FIG. 16, the user apparatus 1600 includes a feedback unit 1601, and other components of the user apparatus 1600 may refer to the related art.

  The feedback unit 1601 uses the periodic feedback mode 2-1 and performs feedback using the double codebook. When the subband granularity of the PMI and the subband granularity of the CQI are different, the smaller subband granularity is changed to PMI and CQI. As the subband granularity of the joint.

  According to the above embodiment, information feedback in MIMO can be enhanced, and a technical scheme of information feedback can be further optimized.

<Example 4>
An embodiment of the present invention provides an information feedback method, and a user device uses a double codebook. FIG. 17 is a flowchart of an information feedback method according to an embodiment of the present invention. As shown in FIG. 17, the information feedback method includes the following steps.

  Step 1701: The user apparatus uses the sub mode 1 of the periodic feedback mode 1-1 and limits the size of the wideband first PMI to 3 bits or less when the rank is 1 or 2.

  In this embodiment, for submode 1 of mode 1-1, the first frame is RI + wideband PMI W1, and the second frame is wideband PMI W2 + wideband CQI. There is a problem when using a new codebook (ie double codebook), when the user supports RI ≦ 2, the user side has two receive antennas to ensure reliable reception of the RI The feedback overhead supported by 4 is 4 bits. On the other hand, when the user supports RI ≦ 4, the user side has 4 reception antennas, and in order to ensure reliable reception of RI, the feedback overhead supported at maximum Is 5 bits. Both of these situations require that the feedback bit of wideband W1 is 3 bits.

  However, at present, in the case of Rank 1 or 2, the size of W1 is 16, that is, 4 bits are required. Therefore, further selection techniques need to be used to satisfy the design requirements. For ranks 3 and 4, when using a new codebook, the size of W1 is 4, and when using an R8 codebook, the size of W1 is 1, and there is no further selection problem.

  Specifically, when the wideband first PMI exceeds 3 bits, the method reduces codewords in which the beams in the wideband first PMI overlap or increases the accuracy in the discrete Fourier transform vector of the wideband first PMI. The reduction may include limiting the size of the wideband first PMI.

In other words, regarding the further selection of Ranks 1 and 2, for example, further selection may be performed according to the following principle. Reduce codewords with overlapping beams in W1 or reduce accuracy in DFT vectors, eg, for Q ₁ = 16, you may further select only for Q ₁ = 8 vector, Codewords are defined in the standard.

（ｎ＝１，…，１６）、奇数（ｎ＝１，３，…，１５）個のコードワードを選択することで、ビームのオーバーラップが２であることを確保してもよい。或いは、

、ＤＦＴ精度を低減させ、ｎが偶数のコードワードを選択し、サンプリング率が１６から８に低減する。或いは、

、ビーム重複を低減させ、即ちｎが奇数のコードワードを選択してサブサンプリングを行う。なお、上記実施例は単なる本発明を例示的に説明するものであり、本発明はこれに限定されない。 For example:

By selecting (n = 1,..., 16), odd (n = 1, 3,..., 15) codewords, it may be ensured that the beam overlap is 2. Or

, Reduce the DFT accuracy, select codewords with an even number n, and reduce the sampling rate from 16 to 8. Or

, Beam overlap is reduced, that is, sub-sampling is performed by selecting an odd-numbered code word. In addition, the said Example demonstrates only this invention exemplarily, and this invention is not limited to this.

  Specifically, when the wideband first PMI exceeds 3 bits, the method is based on the fact that the user equipment receives information configured by the base station through higher layer signaling (for example, RRC signaling) and is based on higher layer signaling. Selecting a set corresponding to the wideband first PMI from a plurality of predetermined sets, and the number of codewords of the set is eight or less. The plurality of predetermined sets may be defined by a standard.

  For example, the standard may define a set of 8 codewords based solely on the design and configure the set for further selection using, for example, RRC signaling. For example, the first codeword set is a codebook set for a large spacing dual polarization antenna system, the second codeword set is a codebook set for a small spacing dual polarization antenna system, and RRC signaling is A codebook set for further selection is constructed based on the antennas used for.

  FIG. 18 is another flowchart of the information feedback method according to the embodiment of the present invention. As shown in FIG. 18, the information feedback method includes the following steps.

  Step 1801: When the periodic feedback mode 2-1 is used, the user apparatus feeds back the subband second PMI, the subband CQI, and the subband label information in the third frame using 11 bits.

  In the present embodiment, for the periodic feedback mode 2-1, the third frame feeds back subband CQI / PMI2 / subband label information (subband label index). When rank = 1, there is only one CQI information, and the feedback overhead can be controlled within 11 bits. When rank = 2, if compression is not performed, each subband CQI1 / 2 is 4 + 3 bits, and PMI W2 is Since it is 4 bits and the sublabel index is 2-bit information and exceeds 11-bit information that can be loaded by the system, it is necessary to perform bit compression.

  In one aspect, when the rank is 2, the size of the CQI in the third frame is limited by differentially encoding the wideband CQI and the subband CQI.

  Specifically, by compressing the CQI, that is, differentially encoding the CQI information of the wideband and the subband, each CQI requires only 2-bit information. Here, as the differential encoding method, the differential encoding method in aperiodic feedback may be used as it is, for example, as shown in Table 3.

  In another aspect, when the rank is 2, the size of the subband second PMI is limited to 2 bits or less.

  That is, it is necessary to compress the PMI and control the subband PMI W2 within a 2-bit range. For rank = 1, there is only one CQI information and compression is still not needed. For rank = 2, it is necessary to compress the subband PMI W2, and the following two methods may be used.

  Specifically, a combination method of different antennas (polarization pairs) is selected using 1 bit, and a beam is selected using another 1 bit.

における２つのいずれか１つを選択し、もう１つのビットを用いてビームを選択し、そのうち、Ｙ_１、Ｙ_２はｅ_ｉであり、ｅ_ｉは（１，１）（１，３）から（即ち｛（ｅ_１，ｅ_１），（ｅ_１，ｅ_３）｝から）選択され、或いは（１，１）（１，２）から（即ち｛（ｅ_１，ｅ_１），（ｅ_１，ｅ_２）｝から）選択される。 For example, code word structure using 1 bit

Select one of the two and use another bit to select the beam, of which Y ₁ , Y ₂ are e _i , and e _i is from (1,1) (1,3) (Ie from {(e ₁ , e ₁ ), (e ₁ , e ₃ )}) or from (1, 1) (1, 2) (ie {(e ₁ , e ₁ ), (e ₁ , E ₂ )}.

  Or, specifically, a combination method of different antennas may be determined in advance, and a beam may be selected using 2 bits.

であることを決定して、（１，１）、（３，３）、（１，３）、（３，１）から（即ち｛（ｅ_１，ｅ_１），（ｅ_３，ｅ_３），（ｅ_１，ｅ_３），（ｅ_３，ｅ_１）｝から）ｅ_ｉを選択してもよい。 For example, the codeword structure is (Outside 2)

From (1,1), (3,3), (1,3), (3,1) (ie {(e ₁ , e ₁ ), (e ₃ , e ₃ ) , (E ₁ , e ₃ ), (e ₃ , e ₁ )})) e _i may be selected.

  For rank = 3 or 4, if no enhancement codeword is used, the DFT codebook, ie the previous 4 codewords or the last 4 codewords of the R8 codebook, may be used. If a new codeword design is used (ie a double codebook is used), a similar design concept may be used. That is, a code word structure (that is, a combination method of different polarization pairs) is selected by 1 bit, and a beam is selected by another bit.

、そのうち、第１ビットでコードワード構造を選択し、第２ビットでビーム｛ｅ_１，ｅ_５，ｅ_５｝及び｛ｅ_５，ｅ_１，ｅ_１｝から選択する。なお、本発明はこれに限定されず、実際の状況に応じて具体的な態様を決定してもよい。 For example,

Among them, the code word structure is selected by the first bit, and the beam {e ₁ , e ₅ , e ₅ } and {e ₅ , e ₁ , e ₁ } are selected by the second bit. In addition, this invention is not limited to this, You may determine a specific aspect according to an actual condition.

  FIG. 19 is another flowchart of the information feedback method according to the embodiment of the present invention. As shown in FIG. 19, the information feedback method includes the following steps.

  Step 1901: The user apparatus uses the sub mode 2 of the periodic feedback mode 1-1 and limits the wideband first PMI to 3 bits or less when the rank is 2 or more.

  In this embodiment, for submode 2 of mode 1-1, the first frame feeds back RI information, and the second frame feeds back wideband PMI W1 + wideband PMI W2 + wideband CQI information. When rank = 1, it is necessary to perform 1-bit subsampling on the wideband PMI W1 or the wideband PMI W2, and when rank = 2, it is necessary to control the number of bits of W1 + W2 to 4 bits. A method of subsampling W1 from 4 bits to 3 bits and subsampling W2 to 1 bit when rank ≧ 2 may be used.

  Specifically, W1 may use the subsampling method in submode 1 as it is. That is, when the wideband first PMI exceeds 3 bits, the codewords in which the beams in the wideband first PMI overlap are reduced, or the accuracy in the discrete Fourier transform vector of the wideband first PMI is reduced. Limit the size of the first PMI.

  Alternatively, when the wideband first PMI exceeds 3 bits, the user equipment supports the wideband first PMI and the codeword exceeds 8 based on information configured by the base station based on higher layer signaling. Select no set.

コードワード構造のみを選択してもよく、そのうち、Ｙ_１、Ｙ_２はいずれもｅ_１を選択する。なお、本発明はこれに限定されない。 As for W2, when rank = 2, a combination method of different polarization pairs may be selected using 1 bit.

Only the code word structure may be selected, of which Y ₁ and Y ₂ both select e ₁ . The present invention is not limited to this.

  If rank = 3, 4, using the R8 codebook, no further selection is required for W1 = 0, W2 and wideband CQI. When the double codebook is used, the size of the wideband first PMI is 2 bits, and the size of the wideband second PMI is limited to 2 bits or less. For example, the mode 2-1 method may be used as it is. That is, the size of the wideband second PMI may be limited to 2 bits or less. For example, a combination method of different polarization pairs is selected using one bit, and a beam is selected using another bit.

  Alternatively, when rank = 3 and 4, the size of the wideband first PMI is 1 bit, and the size of the wideband second PMI is limited to 3 bits or less. Specifically, the size of the wideband first PMI may be limited from 2 bits to 1 bit by reducing beam overlap between different codewords or reducing the beam interval.

、ビーム間隔を低減する方法を用いて、例えばｎ＝０，１，２，３からｎ＝０，２をさらに選択し、これによって、更なる選択の方法を用いて異なるコードワードの１番目のビームの間隔を増大させる。 For example, W1 further selects two codewords from four codewords. For example,

Using a method for reducing the beam spacing, for example, further selecting n = 0,2 from n = 0,1,2,3, so that the first of the different codewords can be selected using a further selection method. Increase beam spacing.

  For the wideband second PMI, if the rank is 4, W2 is 3 bits and no further selection is necessary. If the rank is 3, W2 is 4 bits and further selection is necessary. You may implement | achieve using the method of further selecting a beam combination.

For example,

Furthermore, the selected beams are the first and third columns, ie the following 8 codewords.
(Outside 3)

  The embodiment of the present invention further provides a user apparatus, and FIG. 20 is a diagram showing one configuration of the user apparatus of the embodiment of the present invention. As shown in FIG. 20, the user apparatus 2000 includes a feedback unit 2001, and other components of the user apparatus may refer to the related art.

  The feedback unit 2001 performs feedback using the submode 1 of the periodic feedback mode 1-1. When the rank is 1 or 2, the feedback unit 2001 limits the size of the wideband first PMI to 3 bits or less.

  Alternatively, the feedback unit 2001 feeds back using the periodic feedback mode 2-1, and feeds back the subband second PMI, subband CQI, and subband label information in the third frame using 11 bits.

  Alternatively, the feedback unit 2001 performs feedback using the submode 2 of the periodic feedback mode 1-1, and limits the wideband first PMI to 3 bits or less.

  According to the above embodiment, information feedback in MIMO can be enhanced, and a technical scheme of information feedback can be further optimized.

<Example 5>
Embodiments of the present invention provide an information feedback method. FIG. 21 is a flowchart of an information feedback method according to an embodiment of the present invention. As shown in FIG. 21, the information feedback method includes the following steps.

  Step 2101: The user apparatus feeds back subband PMI, subband CQI, and subband label information using one frame.

  Further, the user apparatus may feed back the rank indicator using another frame and feed back the wideband PMI and the wideband CQI using the other frame.

  For example, the user apparatus feeds back the rank indicator using the first frame, feeds back the wideband PMI and the wideband CQI using the second frame, and uses the third frame to send the subband PMI, subband CQI and CQI. Feedback the label information.

  Currently, the R8 codebook is used, and only subband CQI feedback is supported, and subband CQI / subband PMI feedback is not supported. For transmission modes 4 and 6, aperiodic feedback mode 3-2 already supported subband CQI / subband PMI. For transmission mode 8/9/10, feedback of subband PMI and CQI can be supported with feedback type 1a.

  In this embodiment, in order to ensure the same feedback granularity between the double codebook and the R8 codebook, it is necessary to increase the subband CQI / subband PMI feedback function for the R8 codebook. RI is fed back in the first frame, wideband PMI / CQI is fed back in the second frame, and subband PMI / CQI and sublabel index are fed back in the third frame. Among them, the feedback content of the third frame is the feedback type 1b that needs to be increased. In order to ensure 11-bit feedback overhead, it is necessary to compress the feedback information of the third frame.

  In one aspect, CQI may be compressed. Specifically, the CQI size in the third frame may be limited by differentially encoding the wideband CQI and the subband CQI.

  For example, differential encoding is performed using wideband and subband CQI information, and each CQI requires only 2-bit information. Here, as the differential encoding method, the differential encoding method in aperiodic feedback may be used as it is, for example, as shown in Table 3.

  In another aspect, PMI may be compressed. Specifically, the size of the subband PMI in the third frame may be limited to 2 bits or less. That is, only the previous four codewords or the last four codewords in the R8 codebook are used.

  Embodiments of the present invention further provide user equipment. FIG. 22 is a diagram showing one configuration of the user apparatus according to the embodiment of the present invention. As shown in FIG. 22, the user apparatus 2200 includes a feedback unit 2201, and other components of the user apparatus 2200 may refer to the related art.

  The feedback unit 2201 feeds back a rank indicator using the first frame, feeds back wideband PMI and wideband CQI using the second frame, and uses subframe PMI, subband CQI and subband using the third frame. Feedback the label information.

  According to the above embodiment, information feedback in MIMO can be enhanced, and a technical scheme of information feedback can be further optimized.

<Example 6>
Embodiments of the present invention provide an information feedback method. FIG. 23 is a flowchart of an information feedback method according to an embodiment of the present invention. As shown in FIG. 23, the information feedback method includes the following steps.

  Step 2301: The user apparatus reports the instruction information to the base station so that the base station acquires the adjusted feedback granularity of the user apparatus based on the instruction information for indicating the feedback granularity.

  In MU-MIMO transmission, improvement in feedback accuracy leads to improvement in system performance. Improving the feedback granularity is one method for effectively improving the feedback accuracy. Conventional methods improve feedback accuracy by an almost quasi-static configuration method. In an actual system, the base station does not have accurate dynamic interference information and uplink load information, and the immediate relevance of the channel changes with time. It is necessary to adjust the feedback granularity immediately according to the situation.

  In one aspect, the indication information is one bit, for example, one new granularity indicator (NGI) bit, the method further comprising: the user equipment jointly transmits the rank indicator and the indication information. Including.

  Here, NGI supports the PRB granularity used for this feedback. For example, “0” represents the PRB granularity in the standard, “1” represents the finer PRB feedback granularity, or, for example, “0” represents the conventional codebook in the standard, and “1” represents the finer spatial granularity. Represents a code book. You may apply to a periodic feedback mode and an aperiodic feedback mode.

であり、Ｋ個のサブバンドからＮ個のサブバンドを選択してフィードバックする。 In another aspect, the user equipment may add indication information to the aperiodic feedback to indicate a subband for increasing feedback granularity. Here, the instruction information is (Outside 4)

N subbands are selected from the K subbands and fed back.

  That is, N subbands are selected from the K subbands and appropriate high precision subband feedback is performed, and the other subbands are still fed back with subband precision defined in the R10 standard. The signaling overhead required for this is log2 (<N, K>).

  FIG. 24 is a diagram illustrating changing the feedback accuracy of the embodiment of the present invention. As shown in FIG. 24, for example, two subbands are selected from nine subbands, and highly accurate feedback is performed, and the remaining seven subbands are still fed back with the accuracy of the R10 standard.

  The embodiment of the present invention further provides a user apparatus, and FIG. 25 is a diagram showing one configuration of the user apparatus of the embodiment of the present invention. As shown in FIG. 25, the user device 2500 includes a feedback unit 2501, and other components of the user device 2500 may refer to the related art.

  The feedback unit 2501 reports the instruction information to the base station so that the base station acquires the feedback granularity after adjustment of the user apparatus based on the instruction information for indicating the feedback granularity.

  The embodiment of the present invention further provides an information configuration method and will be described from the base station side. FIG. 26 is a flowchart of an information configuration method according to an embodiment of the present invention. As shown in FIG. 26, the method includes the following steps.

  Step 2601: The base station configures N for the user equipment so that the user equipment selects N subbands from the K subbands and feeds back.

  Step 2602: The base station receives the instruction information for indicating the feedback granularity transmitted by the user apparatus, and acquires the adjusted feedback granularity of the user apparatus based on the instruction information.

  The embodiment of the present invention further provides a base station, and FIG. 27 is a diagram showing one configuration of the base station of the embodiment of the present invention. As shown in FIG. 27, the base station 2700 includes a configuration unit 2701 and a reception unit 2702, and other configuration units of the base station 2700 may refer to the related art.

  The configuration unit 2701 configures N for the user apparatus so that the user apparatus selects and feeds back N subbands from the K subbands. The receiving unit 2702 receives the instruction information indicating the feedback granularity transmitted from the user apparatus, and causes the base station to acquire the adjusted feedback granularity of the user apparatus based on the instruction information.

  According to the above embodiment, information feedback in MIMO can be enhanced, and a technical scheme of information feedback can be further optimized.

  Embodiments of the present invention further provide a communication system, which includes the user equipment and the base station described in the above embodiments.

  FIG. 28 is a diagram showing one configuration of the communication system according to the sixth embodiment of the present invention. As shown in FIG. 28, the communication system includes a user equipment 2801 and a base station 2802. The user apparatus 2801 feeds back information to the base station 2802.

  An embodiment of the present invention further provides a computer-readable program that causes a computer to execute the above information feedback method on the user device when the user device executes the program.

  An embodiment of the present invention further provides a storage medium for storing a computer-readable program for causing a computer to execute the above information feedback method on a user device.

  The embodiment of the present invention further provides a computer-readable program that causes a computer to execute the above information configuration method in the base station when the program is executed in the base station.

  An embodiment of the present invention further provides a storage medium for storing a computer-readable program for causing a computer to execute the above information configuration method in a base station.

  The above apparatus and method of the present invention may be realized by hardware, or may be realized by combining hardware and software. The present invention relates to a computer-readable program. When the program is executed by a logic unit, the logic unit realizes the above-described apparatus or configuration requirements, or the logic unit realizes various methods or steps described above. Can be made. The present invention relates to a storage medium for storing the above program, such as a hard disk, a disk, an optical disk, a DVD, a flash memory, and the like.

  One or more functional blocks and / or one or more combinations of functional blocks in the accompanying drawings may be implemented as a general purpose processor, digital signal processor (DSP), application specific integrated circuit (ASIC), field programmable gate Arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or any suitable combination thereof. They also implement one or more microprocessors, multiple processors, for example as a combination of DSP and microprocessor, in combination with a communications DSP as a combination of computing equipment, or in any other such configuration be able to.

  Although the present invention has been described above with reference to specific embodiments, the above description is merely illustrative and does not limit the scope of protection of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and principle of the present invention, and these changes and modifications are also within the scope of the present invention.

Claims (10)

An information feedback method comprising:
When the user equipment uses the periodic feedback mode 2-1, the subband second PMI (precoding matrix indicator), the subband CQI (channel quality indicator) and the subband label information in the third frame are fed back using 11 bits. how to.   The method according to claim 1, wherein, when the rank is 2, the size of the CQI in the third frame is limited by differentially encoding the wideband CQI and the subband CQI. The first wideband CQI and the first subband CQI are differentially encoded to obtain the first subband CQI after the difference, the second wideband CQI and the second subband CQI are differentially encoded, and the first subband CQI after the difference is obtained. 2 subband CQI is acquired,
In the differential encoding mapping table, when the offset value is 0, the differential CQI value is 0, when the offset value is 1, the differential CQI value is 1, and when the offset value is 2 or more, the differential The method according to claim 2, wherein the differential CQI value is 3 if the CQI value is 2 and the offset value is -1 or less.   The method according to claim 1, wherein when the rank is 2, or when a double codebook is used and the rank is 3 or 4, the size of the subband second PMI is limited to 2 bits or less.   5. The method according to claim 4, wherein a different antenna combination scheme is selected using one bit and a beam is selected using another one bit. (Outside 1)

Selects a combination scheme of the antenna _from, selecting the beam from _{{(e 1, e 1)} , (e 1, e 3)} or _{{(e 1, e 1)} , (e 1, e 2)}, The method of claim 5.   The method according to claim 4, wherein different antenna combinations are pre-determined and the beam is selected using 2 bits. The determined antenna combination method is (Outside 2)

The method according to claim 7, wherein the beam is selected from {(e ₁ , e ₁ ), (e ₃ , e ₃ ), (e ₁ , e ₃ ), (e ₃ , e ₁ )}.   If a single codeword codebook is used and the rank is 3 or 4, the subband second PMI uses the previous four codewords or the last four codewords of the single codeword codebook. The method of claim 1. A user device,
Feedback means for feeding back using the periodic feedback mode 2-1,
User equipment that feeds back subband second PMI (precoding matrix indicator), subband CQI (channel quality indicator) and subband label information in the third frame using 11 bits.

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