TW201448517A  Transmission method and device for channel state information based on codebook  Google Patents
Transmission method and device for channel state information based on codebook Download PDFInfo
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 TW201448517A TW201448517A TW103119651A TW103119651A TW201448517A TW 201448517 A TW201448517 A TW 201448517A TW 103119651 A TW103119651 A TW 103119651A TW 103119651 A TW103119651 A TW 103119651A TW 201448517 A TW201448517 A TW 201448517A
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 precoding matrix
 codebook
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Classifications

 H—ELECTRICITY
 H04—ELECTRIC COMMUNICATION TECHNIQUE
 H04B—TRANSMISSION
 H04B7/00—Radio transmission systems, i.e. using radiation field
 H04B7/02—Diversity systems; Multiantenna system, i.e. transmission or reception using multiple antennas
 H04B7/04—Diversity systems; Multiantenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
 H04B7/06—Diversity systems; Multiantenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
 H04B7/0613—Diversity systems; Multiantenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
 H04B7/0615—Diversity systems; Multiantenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
 H04B7/0619—Diversity systems; Multiantenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
 H04B7/0636—Feedback format
 H04B7/0639—Using selective indices, e.g. of a codebook, e.g. predistortion matrix index [PMI] or for beam selection

 H—ELECTRICITY
 H04—ELECTRIC COMMUNICATION TECHNIQUE
 H04B—TRANSMISSION
 H04B7/00—Radio transmission systems, i.e. using radiation field
 H04B7/02—Diversity systems; Multiantenna system, i.e. transmission or reception using multiple antennas
 H04B7/04—Diversity systems; Multiantenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
 H04B7/0413—MIMO systems
 H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting

 H—ELECTRICITY
 H04—ELECTRIC COMMUNICATION TECHNIQUE
 H04B—TRANSMISSION
 H04B7/00—Radio transmission systems, i.e. using radiation field
 H04B7/02—Diversity systems; Multiantenna system, i.e. transmission or reception using multiple antennas
 H04B7/04—Diversity systems; Multiantenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
 H04B7/06—Diversity systems; Multiantenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
 H04B7/0613—Diversity systems; Multiantenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
 H04B7/0615—Diversity systems; Multiantenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
 H04B7/0617—Diversity systems; Multiantenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming

 H—ELECTRICITY
 H04—ELECTRIC COMMUNICATION TECHNIQUE
 H04B—TRANSMISSION
 H04B7/00—Radio transmission systems, i.e. using radiation field
 H04B7/02—Diversity systems; Multiantenna system, i.e. transmission or reception using multiple antennas
 H04B7/04—Diversity systems; Multiantenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
 H04B7/06—Diversity systems; Multiantenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
 H04B7/0613—Diversity systems; Multiantenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
 H04B7/0615—Diversity systems; Multiantenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
 H04B7/0619—Diversity systems; Multiantenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side

 H—ELECTRICITY
 H04—ELECTRIC COMMUNICATION TECHNIQUE
 H04B—TRANSMISSION
 H04B7/00—Radio transmission systems, i.e. using radiation field
 H04B7/02—Diversity systems; Multiantenna system, i.e. transmission or reception using multiple antennas
 H04B7/04—Diversity systems; Multiantenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
 H04B7/06—Diversity systems; Multiantenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
 H04B7/0613—Diversity systems; Multiantenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
 H04B7/0615—Diversity systems; Multiantenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
 H04B7/0619—Diversity systems; Multiantenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
 H04B7/0621—Feedback content
 H04B7/063—Parameters other than those covered in groups H04B7/0623  H04B7/0634, e.g. channel matrix rank or transmit mode selection

 H—ELECTRICITY
 H04—ELECTRIC COMMUNICATION TECHNIQUE
 H04B—TRANSMISSION
 H04B7/00—Radio transmission systems, i.e. using radiation field
 H04B7/02—Diversity systems; Multiantenna system, i.e. transmission or reception using multiple antennas
 H04B7/04—Diversity systems; Multiantenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
 H04B7/06—Diversity systems; Multiantenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
 H04B7/0613—Diversity systems; Multiantenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
 H04B7/0615—Diversity systems; Multiantenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
 H04B7/0619—Diversity systems; Multiantenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
 H04B7/0621—Feedback content
 H04B7/0632—Channel quality parameters, e.g. channel quality indicator [CQI]
Abstract
Description
The invention belongs to the field of communication technologies, and in particular relates to a method and a device for transmitting channel state information based on a codebook.
At present, the Long Term EvolutionAdvanced (LTEA) system supports 10 transmission modes and 4 physical uplink control channels (PUCCH) reporting modes. Based on the semistatic configuration of the highlevel signaling, the terminal (User Equipment, UE; also referred to as the user equipment) periodically feeds back different channel quality identifiers on the PUCCH by using the PUCCH reporting mode shown in Table 1. Channel Quality Indication (CQI), Precoding Matrix Indication (PMI), and Rank Indication (RI).
Specifically, for each transmission mode, it supports the following PUCCH reporting mode:
Transmission mode 1: Mode 10 and Mode 20.
Transmission mode 2: Mode 10 and Mode 20.
Transmission mode 3: Mode 10 and Mode 20.
Transmission mode 4: Mode 11 and Mode 21.
Transmission mode 5: Mode 11 and Mode 21.
Transmission mode 6: Mode 11 and Mode 21.
Transmission mode 7: Mode 10 and Mode 20.
Transmission mode 8: If the UE is configured to report PMI/RI, mode 11 and mode 21 are supported; if the UE is configured to have no PMI/RI reporting, mode 10 and mode 20 are supported.
Transmission mode 9: If the UE is configured to report PMI/RI and the CSIRS parameter is greater than 1, mode 11 and mode 21 are supported; if the UE is configured to have no PMI/RI report or CSIRS parameter If 1, it supports mode 10 and mode 20.
Transmission mode 10: If the UE is configured to report PMI/RI and the CSIRS parameter is greater than 1, mode 11 and mode 21 are supported; if the UE is configured to have no PMI/RI report or CSIRS parameter If 1, it supports mode 10 and mode 20.
The reporting mode 11 is used for feedback RI, broadband PMI, and broadband CQI.
In the PMI calculation, when the antenna number (CRS埠 or CSIRS埠) is 4, the codebook used is shown in Table 2:
However, in order to improve the feedback accuracy of the channel state information in the case of 4 antennas, the codebook of 4 antennas is enhanced in the new version of LTEA (R12, Release12). Possible enhancements to the codebook include: Codebook Enhancement Solution 1: Where n =0,1,..,15
Where q _{1} = e ^{ j 2 π /32}
For rank 1, And And α ( i )= q _{1} ^{2( i 1)} ; For rank 2, And Or; codebook enhancement scheme 2: Where n =0,1,..,15
Where q _{1} = e ^{ j 2 π /32}
For rank 1, And And α ( i )= q _{1} ^{2( i 1)} ; For rank 2,
In the case of Rank3 and Rank4 in the above two enhancement schemes, the existing 4antenna codebook is still used.
In addition to the PMI feedback in the codebook in Table 2, users of the new version (R12) in the LTEA system can also choose to use the enhanced codebook for feedback of channel status information. The enhanced codebook and the existing codebook adopt different codebook structures, which are specifically represented by: one codebook index corresponding to one precoding matrix in the existing codebook, and two codebook indexes corresponding to one precoding in the enhanced codebook. Matrix, that is, a precoding matrix in the enhanced codebook needs to be composed of a pair of codes The index (referred to as the first codebook index and the second codebook index) is determined. Therefore, the existing PUCCH Mode 11 cannot support the user to use the enhanced codebook for RI, broadband PMI, broadband CQI, and subband CQI feedback.
In summary, in the case of 4 antennas, there is currently no specific scheme for channel state information feedback based on the enhanced codebook.
The embodiment of the present invention provides a method and a device for transmitting channel state information based on a codebook, which are used to solve the problem that a specific scheme for channel state information feedback based on an enhanced codebook is not currently solved for a 4antenna frame. .
The embodiment of the invention provides a method for transmitting channel state information based on a codebook, which comprises: after receiving the indication information sent by the base station, the terminal determines the level indication RI and the used one from the compressed 4 antenna codebook. a precoding matrix; the terminal determines, according to the set joint coding rule, a joint coding value corresponding to the PMI of the first precoding matrix indicating the first codebook index of the precoding matrix; the terminal according to the indication information The feedback mode indicated in the medium, at the set feedback time, the determined joint code value is sent to the base station, and at another set feedback time, the second PMI for indicating the second codebook index of the precoding matrix is used. And the channel quality indicator CQI is sent to the base station; wherein the 4 antenna codebook refers to a code for performing precoding matrix indication feedback and including the first codebook index and the second codebook index in 4 pilot configurations. The value of the first codebook index ranges from 0 to N1, where N is an integer greater than 1. The compressed 4antenna codebook refers to the first codebook index in the 4antenna codebook. a codebook formed by compressing the first precoding matrix set and comprising a compressed first precoding matrix set and a second precoding matrix set corresponding to the second codebook index, the compressed first precoding matrix The set includes a partial precoding matrix in the first precoding matrix set before compression.
Preferably, the compressed first precoding matrix set is: mode one, dividing the precoding matrix in the first precoding matrix set before compression into a group, wherein each of the two precoding matrices included in the group has the same discrete Fourier transform DFT vector; and one of the precoding matrices included in each group is arbitrarily selected as the precoding matrix in the compressed first precoding matrix set; Or, in the second manner, dividing the precoding matrix in the first precoding matrix set before compression into a group, wherein a first column DFT vector of two precoding matrices included in each group is an adjacent DFT vector; arbitrarily selecting one from each set of precoding matrices as precoding in the compressed first precoding matrix set matrix.
Preferably, the compressed first precoding matrix set adopts the following structure: Manner 3: arbitrarily select a partial precoding matrix in the compressed first precoding matrix set, and use the selected precoding matrix as a precoding matrix in the final compressed first precoding matrix set.
Preferably, the compressed 4 antenna codebook adopts the following structure: the first precoding matrix set corresponding to the first codebook index in the codebook of level 1 is the compressed first preamble. a set of coding matrices; and/or a first precoding matrix set corresponding to the first codebook index in the codebook of level 2 is a compressed first precoding matrix set.
Preferably, if the first precoding matrix set corresponding to the first codebook index in the codebook of level 1 is the compressed first precoding matrix set, the joint coding value corresponding to RI=1 in the joint coding rule And the number of the first codebook index is the same as the number of the precoding matrix included in the compressed first precoding matrix set, and each joint coded value corresponds to a different first codebook index; The first precoding matrix set corresponding to the first codebook index in the codebook of 2 is the compressed first precoding matrix set, and the joint coding corresponding to RI=2 in the joint coding rule The value and the number of the first codebook index are the same as the number of precoding matrices included in the compressed first precoding matrix set, and each joint coded value corresponds to a different first codebook index.
The embodiment of the present invention provides a method for receiving channel state information based on a codebook, which includes: the base station sends indication information to the terminal, where the indication information is used to indicate the feedback status information of the terminal and the feedback mode used in the feedback; According to the feedback mode, the base station receives the joint coded value of the RI and the first PMI sent by the terminal at the set feedback time, and receives the 4 antennas sent by the terminal for indicating the compression at another set feedback time. a second PMI and a CQI of the second codebook index of the precoding matrix in the codebook; the base station determines, according to the set joint coding rule, an RI corresponding to the received joint coding value and a first codebook index of the precoding matrix The 4antenna codebook refers to a codebook for performing precoding matrix indication information feedback and including a first codebook index and a second codebook index in a 4pilot configuration, and the first codebook index is taken. The value ranges from 0 to N1, where N is an integer greater than 1. The compressed 4antenna codebook refers to the first precoding matrix corresponding to the first codebook index in the 4antenna codebook. a codebook formed by compressing the first precoding matrix set and the second precoding matrix set corresponding to the second codebook index, and the compressed first precoding matrix set includes the precompression A partial precoding matrix in a precoding matrix set.
Preferably, the compressed first precoding matrix set adopts the following structure: mode 1: dividing the precoding matrix in the first precoding matrix set before compression into a group, wherein each of the two precoding matrices included in the group has the same discrete Fourier transform DFT vector; and one of the precoding matrices included in each group is arbitrarily selected as the precoding matrix in the compressed first precoding matrix set; Or, in the second manner, dividing the precoding matrix in the first precoding matrix set before compression into a group, wherein a first column DFT vector of two precoding matrices included in each group is an adjacent DFT vector; arbitrarily selecting one from each set of precoding matrices as precoding in the compressed first precoding matrix set matrix.
Preferably, the compressed first precoding matrix set adopts the following structure: mode 3, arbitrarily selects a part of the precoding matrix in the compressed first precoding matrix set, and uses the selected precoding matrix as the final compressed A precoding matrix in the first set of precoding matrices.
Preferably, the compressed 4antenna codebook adopts the following structure: the first precoding matrix corresponding to the first codebook index in the codebook of level 1 is the compressed first precoding. a set of matrices; and/or a first precoding matrix set corresponding to the first codebook index in the codebook of level 2 is a compressed first precoding matrix set.
Preferably, if the first precoding matrix set corresponding to the first codebook index in the codebook of level 1 is the compressed first precoding matrix set, the joint coding value corresponding to RI=1 in the joint coding rule And the number of the first codebook index is the same as the number of the precoding matrix included in the compressed first precoding matrix set, and each joint coded value corresponds to a different first codebook index; The first precoding matrix set corresponding to the first codebook index in the codebook of 2 is the compressed first precoding matrix set, and the joint coding value corresponding to RI=2 and the first codebook index in the joint coding rule The number is the same as the number of precoding matrices included in the compressed first precoding matrix set, and each joint encoding value corresponds to a different first codebook index.
The embodiment of the present invention provides a terminal, including: a first determining module, configured to: after receiving the indication information sent by the base station, determine the RI and the used precoding matrix from the compressed 4antenna codebook; a second determining module, configured to determine, according to the set joint coding rule, that the RI corresponds to a first precoding matrix indicating PMI for indicating a first codebook index of the precoding matrix The joint coding value is used to send the determined joint code value to the base station at the set feedback time according to the feedback mode indicated in the indication information, and at another set feedback time, Transmitting, by the second PMI and the channel quality indicator CQI, the second PMI of the precoding matrix to the base station; wherein the 4 antenna codebook is used to perform precoding matrix indication feedback in 4 pilot configurations And a codebook including a first codebook index and a second codebook index, where the first codebook index ranges from 0 to N1, where N is an integer greater than one; the compressed four antenna codebook is Refers to the compression of the first precoding matrix set corresponding to the first codebook index in the 4antenna codebook, and the compressed second precoding matrix set and the second precoding matrix corresponding to the second codebook index. A set of codebooks is formed, the compressed first precoding matrix set comprising a partial precoding matrix in the first precoding matrix set before compression.
Preferably, the compressed first precoding matrix set adopts the following structure: mode 1: dividing the precoding matrix in the first precoding matrix set before compression into a group, wherein each of the two precoding matrices included in the group has the same discrete Fourier transform DFT vector; and one of the precoding matrices included in each group is arbitrarily selected as the precoding matrix in the compressed first precoding matrix set; Or, in the second manner, dividing the precoding matrix in the first precoding matrix set before compression into a group, wherein a first column DFT vector of two precoding matrices included in each group is an adjacent DFT vector; arbitrarily selecting one from each set of precoding matrices as precoding in the compressed first precoding matrix set matrix.
Preferably, the compressed first precoding matrix set adopts the following structure: mode 3, arbitrarily selects a part of the precoding matrix in the compressed first precoding matrix set, and uses the selected precoding matrix as the final compressed A precoding matrix in the first set of precoding matrices.
Preferably, the compressed 4antenna codebook adopts the following structure: the first precoding matrix set corresponding to the first codebook index in the codebook of level 1 is the compressed first preprefix. a set of coding matrices; and/or a first precoding matrix set corresponding to the first codebook index in the codebook of level 2 is a compressed first precoding matrix set.
Preferably, if the first precoding matrix set corresponding to the first codebook index in the codebook of level 1 is the compressed first precoding matrix set, the joint coding value corresponding to RI=1 in the joint coding rule And the number of the first codebook index is the same as the number of the precoding matrix included in the compressed first precoding matrix set, and each joint coded value corresponds to a different first codebook index; The first precoding matrix set corresponding to the first codebook index in the codebook of 2 is the compressed first precoding matrix set, and the joint coding value corresponding to RI=2 and the first codebook index in the joint coding rule The number is the same as the number of precoding matrices included in the compressed first precoding matrix set, and each joint encoding value corresponds to a different first codebook index.
An embodiment of the present invention provides another terminal, where the terminal includes at least: a memory, a processor, and an antenna, where: at least a compressed 4antenna codebook is stored in the memory, and a joint coding rule is set; the antenna receiving base The indication information sent by the station, and triggering the processor to perform feedback of the channel state information; the processor determines, under the trigger of the antenna, the RI and the precoding matrix used from the compressed 4antenna codebook stored in the memory; Determining, according to a joint coding rule stored in the memory, a joint coding value corresponding to the first PMI of the first codebook index indicating the precoding matrix, and indicating according to the indication information received by the antenna. In the feedback mode, the indication antenna transmits the joint code value determined by itself to the base station at the set feedback time, and at the other set feedback time, the second PMI used to indicate the second codebook index of the precoding matrix And CQI is sent to the base station.
The 4antenna codebook is a codebook for performing precoding matrix indication information feedback and includes a first codebook index and a second codebook index, and the value of the first codebook index is used in the four pilots. The range is 0 to N1, where N is an integer greater than 1. The compressed 4antenna codebook is obtained by compressing the first precoding matrix set corresponding to the first codebook index in the 4antenna codebook. a codebook consisting of the compressed first precoding matrix set and the second precoding matrix set corresponding to the second codebook index, the compressed first precoding matrix set including the first precoding matrix set before compression Partial precoding matrix in .
The embodiment of the present invention provides a base station, including: a sending module, configured to send indication information to the terminal, where the indication information is used to indicate the feedback status information of the terminal and the feedback mode used in the feedback; the receiving module, And receiving, according to the feedback mode, a joint coded value of the RI and the first PMI sent by the terminal at a set feedback time, and receiving, at another set feedback time, a 4antenna code sent by the terminal for indicating compression. a second PMI and a CQI of the second codebook index of the precoding matrix; the processing module is configured to determine, according to the set joint coding rule, an RI corresponding to the received joint coding value and a first code of the precoding matrix The index of the 4th antenna is a codebook for performing precoding matrix indication information feedback and including the first codebook index and the second codebook index in the configuration of the first pilot, and the first codebook index The value ranges from 0 to N1, where N is an integer greater than 1. The compressed 4antenna codebook refers to the first precoding matrix set corresponding to the first codebook index in the 4antenna codebook. compression And a codebook formed by the compressed first precoding matrix set and the second precoding matrix set corresponding to the second codebook index, where the compressed first precoding matrix set includes the first precompression A partial precoding matrix in a set of coding matrices.
Preferably, the compressed first precoding matrix set adopts the following structure: mode 1: dividing the precoding matrix in the first precoding matrix set before compression into a group, wherein each of the two precoding matrices included in the group has the same discrete Fourier transform DFT vector; and one of the precoding matrices included in each group is arbitrarily selected as the precoding matrix in the compressed first precoding matrix set; Or, in the second manner, dividing the precoding matrix in the first precoding matrix set before compression into a group, wherein a first column DFT vector of two precoding matrices included in each group is an adjacent DFT vector; arbitrarily selecting one from each set of precoding matrices as precoding in the compressed first precoding matrix set matrix.
Preferably, the compressed first precoding matrix set adopts the following structure: mode 3, arbitrarily selects a part of the precoding matrix in the compressed first precoding matrix set, and uses the selected precoding matrix as the final compressed A precoding matrix in the first set of precoding matrices.
Preferably, the compressed 4antenna codebook adopts the following structure: the first precoding matrix set corresponding to the first codebook index in the codebook of level 1 is the compressed first a precoding matrix set; and/or a first precoding matrix set corresponding to the first codebook index in the codebook of level 2 is a compressed first precoding matrix set.
Preferably, if the first precoding matrix set corresponding to the first codebook index in the codebook of level 1 is the compressed first precoding matrix set, the joint coding value corresponding to RI=1 in the joint coding rule And the number of the first codebook index is the same as the number of the precoding matrix included in the compressed first precoding matrix set, and each joint coded value corresponds to a different first codebook index; The first precoding matrix set corresponding to the first codebook index in the codebook of 2 is the compressed first precoding matrix set, and the joint coding value corresponding to RI=2 and the first codebook index in the joint coding rule The number is the same as the number of precoding matrices included in the compressed first precoding matrix set, and each joint encoding value corresponds to a different first codebook index.
An embodiment of the present invention provides another base station, where the base station includes at least: a memory, a processor, and an antenna, wherein: at least a compressed 4antenna codebook is stored in the memory, and a joint coding rule is set; The triggering information is sent to the terminal, where the indication information is used to indicate the feedback status of the channel information and the feedback mode used by the feedback, and is triggered by the processor according to the feedback mode. The feedback code, the joint code value of the RI and the first PMI sent by the receiving terminal, and the second codebook index sent by the terminal for indicating the precoding matrix in the compressed 4antenna codebook at another set feedback time Two PMI and CQI, and trigger the processor to work; the processor, under the trigger of the antenna, determines the RI corresponding to the received joint code value and the first codebook index from the set joint coding rule stored in the memory 61, further Determining, from the compressed 4antenna codebook stored in the memory, the received first codebook index and the precoding matrix corresponding to the second codebook index
The 4antenna codebook is a codebook for performing precoding matrix indication information feedback and includes a first codebook index and a second codebook index, and the value of the first codebook index is used in the four pilots. The range is 0 to N1, where N is an integer greater than 1. The compressed 4antenna codebook is obtained by compressing the first precoding matrix set corresponding to the first codebook index in the 4antenna codebook. a codebook consisting of the compressed first precoding matrix set and the second precoding matrix set corresponding to the second codebook index, the compressed first precoding matrix set including the first precoding matrix set before compression Partial precoding matrix in .
In the embodiment of the present invention, after receiving the indication information sent by the base station, the terminal determines the RI and the used precoding matrix from the compressed 4antenna codebook; and determines the RI according to the set joint coding rule. Generating a joint code value corresponding to the first PMI of the first codebook index of the precoding matrix; and transmitting the determined joint code value to the base station at the set feedback time according to the feedback mode indicated in the indication information, and At the next feedback moment, it will be used Transmitting, by the base station, the second PMI and the CQI of the second codebook index of the precoding matrix to the base station; the base station sends the indication information to the terminal to indicate the channel status information of the terminal and the feedback mode used in the feedback; according to the feedback a mode, at a set feedback time, receiving a joint coded value of the RI and the first PMI sent by the terminal, receiving a second PMI and a CQI sent by the terminal at another set feedback time; and determining to receive according to the set joint coding rule The RI corresponding to the joint coded value and the first codebook index; it can be seen that the channel state information transmission method and device provided by the embodiment of the present invention pass the compressed 4antenna codebook and the corresponding relationship defined in the joint coding rule In the case of 4 antennas, the channel state information is fed back based on the enhanced codebook.
11~13‧‧‧Steps
21~23‧‧‧Steps
31‧‧‧First Confirmation Module
32‧‧‧Second determination module
33‧‧‧Reward module
41‧‧‧Transmission module
42‧‧‧ receiving module
43‧‧‧Processing module
51‧‧‧ memory
52‧‧‧ processor
53‧‧‧Antenna
61‧‧‧ memory
62‧‧‧Processor
63‧‧‧Antenna
1 is a schematic flowchart of a method for transmitting channel state information based on a codebook according to an embodiment of the present invention; FIG. 2 is a schematic flowchart of a method for receiving channel state information based on a codebook according to an embodiment of the present invention; FIG. 4 is a schematic structural diagram of a first type of base station according to an embodiment of the present invention; FIG. 4 is a schematic structural diagram of a second type of terminal according to an embodiment of the present invention; 6 is a schematic structural diagram of a second base station according to an embodiment of the present invention.
The invention realizes feedback of channel state information based on the enhanced codebook in the case of 4 antennas by the compressed 4antenna codebook and the corresponding relationship defined in the set joint coding rule.
In order to support dual PMI feedback, when the number of antennas (CRS埠 or CSIRS埠) is 8, PUCCH reporting mode 11 further supports the following two submodes (Submode): Submode 1: Contains 2 types of report types: report type 5 for feedback RI and first PMI; report type 2b for feedback CQI and second PMI; Submode 2: contains 2 types of report type: report type 3, for Feedback RI; report type 2c for feedback CQI, first PMI and second PMI.
In the case of 4 antennas, the precoding matrix in the enhanced codebook is composed of each precoding matrix in the first precoding matrix set corresponding to the first PMI and the second precoding matrix set corresponding to the second PMI. Each precoding matrix is formed according to a set enhancement scheme, and the number of precoding matrices included in the enhanced codebook is the number of precoding matrices included in the first precoding matrix set×precoding included in the second precoding matrix set The number of matrices, and each precoding matrix in the enhanced codebook needs to be determined by a first PMI and a second PMI. Therefore, the existing PUCCH mode 11 cannot support the use of the enhanced codebook for RI, broadband PMI (including the first PMI and the second PMI), the wideband CQI, and the subband CQI feedback; a method similar to the 8antenna can be used to make 4 Submode 1 and Submode 2 are also supported in the case of antennas.
However, since the number of precoding matrices in the enhanced codebook is different from the number of precoding matrices in the codebook in the case of 8 antennas, the 8antenna PUCCH mode 11 The subpattern 1 feedback method cannot be directly applied to the feedback of the 4antenna.
The embodiment of the present invention provides a method and a device for transmitting channel state information based on a codebook, which is used to solve the problem of feedback of channel state information based on the enhanced codebook in the case of 4 antennas. In the case of 4 antennas, the PUCCH reporting mode 11 also supports the submode 1 of the PUCCH reporting mode 11 like 8antenna ,, that is, the reporting type including the joint encoding value of the feedback RI and the first PMI. And a report type that returns the second PMI and the CQI, and reports the RI, the first PMI, the second PMI, and the CQI in the above mode period.
Since the codebook enhancement scheme that may be used in the case of 4 antennas includes RI=1, it is necessary to use 4 bits to indicate the first PMI and 4 bits to represent the second PMI, and RI=2 to use the 4bit representation. One PMI and four bits represent the second PMI, and RI=3 and RI=4 In this case, it is necessary to use 0 bits to indicate the first PMI and 4 bits to represent the second PMI. Therefore, the joint encoding of the RI and the first PMI includes 24+24+20+20=34 states, and 6 bits are required. Give feedback.
Considering that the larger the number of information bits of the jointly coded value of the reported RI and the first PMI, the lower the transmission reliability, and the second PMI and CQI of the subsequent feedback are based on the fed back RI and the first PMI calculation. Therefore, the joint code value of the RI and the first PMI is erroneous in the feedback process, which may cause an error in the feedback of the second PMI and the CQI in the next feedback cycle. In the case of 4 antennas, in order to ensure the transmission reliability of the PUCCH, the codebook of 4 antennas needs to be compressed, so that the number of information bits after the joint encoding of the RI and the first PMI does not exceed the error rate that the system can tolerate. The number of bits.
For convenience of description, according to the preferred structure of the codebook used by the 8 antennas, the codebook formed by the codebook enhancement scheme that may be used in the case of 4 antennas is represented by the following twodimensional table: Definition:
1. The 4antenna codebook obtained by the codebook enhancement scheme 1 is shown in Table 3A and Table 3B, wherein i _{1} and i _{2} are codebook indexes, i _{1} represents a first codebook index, and i _{2} represents a second. Codebook index.
Table 3B: codebook with RI=2;
2. The 4antenna codebook obtained by using the codebook enhancement scheme 2 is as shown in Table 4A and Table 4B, wherein i _{1} and i _{2} are codebook indexes, i _{1} represents a first codebook index, and i _{2} represents a second. Codebook index.
It should be noted that the structure of the abovementioned fourantenna codebook is only a preferred implementation for convenience of description, and is not a limitation on the structure of the 4antenna codebook. The first codebook index in the 4antenna codebook is Other corresponding sequences may be used between the precoding matrices, and/or between the second codebook index and the precoding matrix, and the precoding matrix and the first codebook index, and the precoding matrix and the second code in the 4 antenna codebook are changed. The corresponding order of this index does not affect the performance of the 4antenna codebook.
The codebook compression scheme provided by the embodiment of the present invention is based on the first codebook index and the precoding matrix shown in Tables 3A to 3B and Tables 4A to 4B above, and the second codebook index and precoding. Designed with the corresponding order between the matrices. For a codebook compression scheme, if the corresponding order between the first codebook index and the precoding matrix between the precompression codebook and the second codebook index and the precoding matrix is changed, the compression of the corresponding codebook compression scheme is obtained. The value of the first codebook index should be adjusted accordingly, but should still be considered as the same codebook compression scheme; that is, for the two codebook compression schemes, if the precoding included in the compressed codebook The number of matrices is the same, and for any precoding matrix in any one of the compressed codebooks, the exact same precoding matrix can always be found from another compressed codebook, and the two codebook compression schemes are considered It is the same compression scheme.
The embodiments of the present invention are further described in detail below with reference to the accompanying drawings.
Referring to FIG. 1 , an embodiment of the present invention provides a channel shape based on a codebook. The method for transmitting the state information includes the following steps: Step 11: After receiving the indication information sent by the base station, the terminal determines the RI and the used precoding matrix from the compressed 4antenna codebook; wherein the indication information It is used to indicate the feedback of the channel status information by the terminal, and the feedback mode used to indicate the feedback. Preferably, the indication information can be sent by using control signaling (Downlink Control Information (DCI)).
In this step, the terminal may determine the RI and the precoding matrix used from the compressed 4antenna codebook according to the transmission characteristics and/or the terminal capabilities.
Step 12: The terminal determines, according to the set joint coding rule, a joint code value corresponding to the first PMI that is used to indicate the first codebook index of the precoding matrix, where the joint coding rule defines RI and the first a correspondence between a joint coding value (referred to as I _{ RI/PMI 1} ) corresponding to a PMI, RI, and a first codebook index of a precoding matrix in the compressed 4antenna codebook, the first PMI being used to indicate The first codebook index of the precoding matrix in the compressed 4antenna codebook is in onetoone correspondence with the first codebook index of the precoding matrix in the compressed 4antenna codebook.
Step 13: The terminal sends the determined joint coding value to the base station at the set feedback time according to the feedback mode indicated in the indication information, and sends the second PMI and CQI of the precoding matrix at another set feedback time. To the base station.
The second PMI is used to indicate a second codebook index of the precoding matrix in the compressed 4antenna codebook, and corresponds to the second codebook index of the precoding matrix in the compressed 4antenna codebook. .
In the embodiment of the present invention, the 4antenna codebook refers to a codebook for performing precoding matrix indication information feedback and including a first codebook index and a second codebook index, and a first codebook. The value of the index ranges from 0 to N1, where N is an integer greater than 1. The compressed 4antenna codebook refers to the first precoding matrix corresponding to the first PMI in the foregoing 4antenna codebook. And compressing the codebook obtained by the compression, and the compressed first precoding matrix set includes a partial precoding matrix in the first precoding matrix set before compression.
Specifically, the compressed 4antenna codebook in the embodiment of the present invention is obtained by using the compressed first precoding matrix set and the second precoding matrix set corresponding to the second codebook index by using a set codebook enhancement scheme. The compressed 4antenna codebook includes a partial precoding matrix in the 4antenna codebook before compression.
In an implementation, in order to reduce the number of bits corresponding to the joint coding value of the RI and the first PMI, compress the first precoding matrix set corresponding to the first codebook index in the 4antenna codebook, so as to be compressed based The total number of joint coding values of the RI and the first PMI determined by the 4 antenna codebook is not more than 2N, where N is the number of transmission bits corresponding to the error rate that the system can tolerate; for example, if the system can tolerate 5 bits The error rate under the metainformation, that is, N=5, the total number of joint coding values of the RI and the first PMI determined based on the compressed 4antenna codebook is not more than 25=32, that is, the RI and the first PMI. The joint coding value can only take 0~31; if the system can tolerate the bit error rate under 4bit information, that is, N=4, the total coded joint value of the RI and the first PMI determined based on the compressed 4antenna codebook is obtained. The number is not more than 24=16, that is, the joint coding value of RI and the first PMI can only take 0~15.
In the embodiment of the present invention, the compressed first precoding matrix set includes a partial precoding matrix in the first precoding matrix set before compression, that is, the precoding matrix included in the compressed first precoding matrix set is still compressed. a precoding matrix in the first set of precoding matrixes, except that the compressed first precoding matrix set includes a precoding matrix that is smaller than a precoding matrix included in the first precoding matrix set before compression, so that The total number of joint coding values of the RI and the first PMI determined by the compressed 4antenna codebook is not more than 2N; for example, the first codebook index in the codebook of level 1 in the 4antenna codebook corresponds to The first precoding matrix set is compressed to include only 15 precoding matrices, and the first precoding matrix set corresponding to the first codebook index in the codebook of level 2 is compressed to include only 15 precoding matrices, based on The combined code value of the RI determined by the compressed 4antenna codebook and the first PMI The total number of the first precoding matrix corresponding to the first codebook index in the codebook of level 1 in the 4antenna codebook is compressed to include only a minimum of 31. 8 precoding matrices, and the first precoding matrix set corresponding to the first codebook index in the codebook of level 2 is compressed to include only 8 precoding matrices, and the RI determined based on the compressed 4 antenna codebook The total number of joint code values with the first PMI may be at least 18, only 5 bits are required;
In an implementation, the compressed first precoding matrix set adopts any of the following preferred structures: mode 1: dividing the precoding matrix in the first precoding matrix set before compression into a group, wherein each group includes a precoding matrix having the same Discrete Fourier Transform (DFT) vector; arbitrarily selecting one of each group of precoding matrices as a set in the compressed first precoding matrix set Precoding matrix.
Where N is an even number.
Further, the order of the DFT vectors included in each precoding matrix in each group may be different in different precoding matrices.
Based on the corresponding sequence of the first codebook index, the second codebook index, and the precoding matrix shown in Table 3A, Table 3B, Table 4A, and Table 4B, the codebook compression scheme of the mode 1 is specifically: Precoding matrix in a precoding matrix set is divided into a group, wherein each group includes a precoding matrix with a first codebook index of n and a first codebook index of Precoding matrix, the range of n is And arbitrarily selecting one from each group of precoding matrices, the compressed first precoding matrix set includes all the selected precoding matrices; specifically, taking N as 16 as an example, the first precoding matrix before compression The precoding matrix in the set is divided into 8 groups, each group includes a precoding matrix with a first codebook index of n and a precoding matrix with a first codebook index of n+8, and is arbitrarily selected from each group of precoding matrices. One, the compressed first precoding matrix set includes all selected precoding matrices, where n=0, 1, 2, . . . , 7; whether using codebook enhancement scheme 1 or codebook enhancement scheme 2, The first precoding matrix corresponding to the nth first codebook index in the enhanced codebook is the same as the column vector set included in the first precoding matrix corresponding to the n+8th first codebook index, The only difference is that the order of its columns is different, as follows:
(1) Taking N as 16 as an example, for the case of RI=1, the first codebook index is n and the first codebook index is n+8. The precoding matrix included in Table 5A and Table 5B is as follows:
Comparing the two sets of precoding matrices at corresponding positions in Tables 5A and 5B, it can be seen that the DFT vectors v _{ m } corresponding to the two are the same, except that φ _{ n } is π /8, that is, the DFT vector is The order of arrangement in different precoding matrices is different. According to the law of codebook design under the dual polarized antenna array, v _{ m is } used to quantize the beam direction, and φ _{ n is } used to quantize the phase between the dual polarized arrays. Therefore, The use of a compressed 4antenna codebook (ie, compression using a pair of 4antenna codebooks) in a dualpolarized array and the use of a 4antenna codebook prior to compression have minimal impact on the first PMI and second PMI feedback performance.
Based on the corresponding order of the first codebook index, the second codebook index, and the precoding matrix shown in Table 3A, Table 3B, Table 4A, and Table 4B, as a preferred structure, the compressed first precoding matrix set includes The first codebook index in the first precoding matrix set before compression is Precoding matrix.
For example, taking N as 16 as an example, in the case of RI=1, the 4antenna codebook formed by the codebook enhancement scheme 1 or the codebook enhancement scheme 2 can be compressed into the structure shown in Table 6A:
Based on the corresponding order of the first codebook index, the second codebook index, and the precoding matrix shown in Table 3A, Table 3B, Table 4A, and Table 4B, as another preferred structure, the compressed first precoding matrix set The first codebook index in the first precoding matrix set before compression is Precoding matrix.
For example, taking N as 16 as an example, in the case of RI=1, the 4antenna codebook formed by the codebook enhancement scheme 1 or the codebook enhancement scheme 2 can be compressed into the structure shown in Table 6B:
In the preferred structure, the first codebook index in the compressed 4antenna codebook may follow the first codebook index corresponding to the precoding matrix in the first precoding matrix set before compression, as in the compressed 4 in Table 6B. The first codebook index in the antenna codebook is 8~15, and the precoding matrix included in the compressed first precoding matrix set may be renumbered (ie, the first codebook index corresponding to each precoding matrix is redefined) If the first codebook index in the compressed 4antenna codebook is 08, it is only necessary to ensure that the terminal and the base station have the same understanding of the first codebook index in the compressed 4antenna codebook.
(2) Taking N as 16 as an example. For the case of RI=2, the first codebook index is n and the first codebook index is n+8. The precoding matrix included in Table 7A and Table 7B is as follows: 7A: The first codebook index is n, and the codebook enhancement scheme 1 is adopted.
Comparison Table 7A and Table 7B sets a precoding matrix at the corresponding position, it can be seen found that both the corresponding vector v _{ m } v _{ m } are the same or with v _{ m 'is } the difference in the number of the same, only the differences The phase between the dualpolarized arrays is such that the use of the compressed 4antenna codebook and the precompression 4antenna codebook have minimal impact on the first PMI and the second PMI feedback performance.
As a preferred structure, the compressed first precoding matrix set includes a first codebook index in the first precoding matrix set before compression. Precoding matrix.
For example, in the case of RI=1, the 4antenna codebook formed by the codebook enhancement scheme 1 can be compressed into the structure shown in Table 8A:
For example, in the case of RI=2, the 4antenna codebook formed by the codebook enhancement scheme 2 can be compressed into the structure shown in Table 8B: Table 8B
As another preferred structure, the compressed first precoding matrix set includes a first codebook index in the first precoding matrix set before compression. Precoding matrix.
In the preferred structure, the first codebook index in the compressed 4antenna codebook may follow the first codebook index corresponding to the precoding matrix in the first precoding matrix set before compression, or may be the first compressed pair. The precoding matrix included in the precoding matrix set is renumbered (ie, the first codebook index corresponding to each precoding matrix is redefined), and the first codebook index in the compressed 4 antenna codebook is 08, as long as It is ensured that the terminal and the base station have the same understanding of the first codebook index in the compressed 4antenna codebook.
It should be noted that, based on the corresponding order of the first codebook index, the second codebook index, and the precoding matrix shown in Table 3A, Table 3B, Table 4A, and Table 4B, in this mode, N is taken as an example. The first codebook index in the compressed 4antenna codebook corresponds to a precoding matrix set W1 including 8 precoding matrices, such as: , n =0,...,7; another example, , n =8,...,15; This compression method ensures that the compressed 4antenna codebook contains 32 different discrete Fourier transform (DFT) vectors v _{ m } =[1 e ^{ j 2 πm /32} ] ^{T} , m =0,...,31.
Manner 2, dividing the precoding matrix in the first precoding matrix set before compression into a group, wherein a first column DFT vector of two precoding matrices in each group is an adjacent DFT vector; arbitrarily selecting one from each set of precoding matrices as precoding in the compressed first precoding matrix set matrix.
Where N is an even number.
Wherein, the socalled adjacent DFT vector refers to two DFT vectors obtained by taking m two adjacent values, such as v _{ m } and v _{ m +1} , in v _{ m } =[1 e ^{ j 2 πm /32} ] ^{T} .
Based on the corresponding sequence of the first codebook index, the second codebook index, and the precoding matrix shown in Table 3A, Table 3B, Table 4A, and Table 4B, the codebook compression scheme of the second mode is specifically: the compressed A precoding matrix set includes a precoding matrix in which the first codebook index in the first precoding matrix set before compression is an even or odd number; whether the codebook enhancement scheme 1 or the codebook enhancement scheme 2 is used, the enhanced codebook is used. Taking the precoding matrix with the first codebook index as an even number (or the precoding matrix with the first codebook index as an odd number), the quantization beam direction can be uniformly thinned out. Therefore, after the compression is performed under the dual polarization array The 4antenna codebook (that is, the compression of the mode 2 to the 4antenna codebook) and the use of the 4antenna codebook before compression have minimal impact on the first PMI and the second PMI feedback performance.
For example, taking N as 16 as an example, in the case of RI=1, the 4antenna codebook formed by the codebook enhancement scheme 1 or the codebook enhancement scheme 2 can be compressed as shown in Table 9A or as shown in Table 9B. structure:
For example, taking N as 16 as an example, in the case of RI=2, the 4antenna codebook formed by the codebook enhancement scheme 1 can be compressed into the structure shown in Table 10A:
It should be noted that, in the case of RI=2, the 4antenna codebook formed by the codebook enhancement scheme 1 can be compressed to include only the precoding matrix in which the first codebook index in the first precoding matrix set before compression is odd. The structure is similar to that shown in Table 10A, and will not be enumerated here.
For example, taking N as 16 as an example, in the case of RI=2, the 4antenna codebook formed by the codebook enhancement scheme 2 can be compressed into the structure shown in Table 10B:
It should be noted that, in the case of RI=2, the 4antenna codebook formed by using the codebook enhancement scheme 2 can be compressed to include only the precoding matrix in which the first codebook index in the first precoding matrix set before compression is odd. The structure is similar to that shown in Table 10B, and will not be enumerated here.
In this manner, the first codebook index in the compressed 4antenna codebook may use the first codebook index corresponding to the precoding matrix in the first precoding matrix set before compression, such as the compressed 4antenna codebook. The first codebook index is 0, 2, 4, ..., 14 or 1, 3, 5, ..., 15, and may also renumber the precoding matrix included in the compressed first precoding matrix set (ie, Redefining the first codebook index corresponding to each precoding matrix, if the first codebook index in the compressed 4 antenna codebook is 08, as long as the terminal and the base station are paired with the compressed 4 antenna codebook. The understanding of the first codebook index is the same.
It should be noted that, in this manner, based on the corresponding order of the first codebook index, the second codebook index, and the precoding matrix shown in Table 3A, Table 3B, Table 4A, and Table 4B, N is taken as an example. The first codebook index in the compressed 4antenna codebook corresponds to a precoding matrix set W1 including 8 precoding matrices, such as: , n =0,2,4,...,14; or, , n =1,3,5,...,15; This compression method ensures that the compressed 4 antenna codebook contains 16 equally spaced DFT vectors. , m =0,2,...,14 or , M = 1,3, ..., 15 .
In order to further improve the transmission reliability of the PUCCH, the number of information bits of the joint coding value of the RI and the first PMI may be further reduced, for example, the number of information bits of the joint coded value of the RI and the first PMI is reduced to 4 bits. Preferably, the compressed first precoding matrix set may also adopt the following preferred structure: mode 3, arbitrarily selecting a partial precoding matrix in the first precoding matrix set compressed by adopting mode 1 or adopting mode 2, and selecting The precoding matrix is used as a precoding matrix in the final compressed first precoding matrix set.
For example, arbitrarily selecting 7 precoding matrixes from the first precoding matrix set compressed by using mode 1 or mode 2 as the final compressed first precoding matrix set, so that the joint coding of the RI and the first PMI is performed. The number of information bits for the value is 4 bits.
For example, in the case of RI=1, the first precoding matrix set compressed by the first mode is further compressed to obtain the structure shown in Table 11A, wherein the codebook enhancement scheme 1 or 2 is adopted;
For example, if N is 16 as an example, and RI=2, the first precoding matrix set compressed by mode 1 is further compressed to obtain a structure as shown in Table 11B, wherein the codebook enhancement is adopted. plan 1;
For example, if N is 16 as an example, and RI=2, the first precoding matrix set compressed by mode 1 is further compressed to obtain a structure as shown in Table 11C, where codebook enhancement is adopted. Option 2: Table 11C: RI = 2 and using codebook enhancement scheme 2
In an implementation, the compressed 4antenna codebook adopts the following structure: the first precoding matrix set corresponding to the first codebook index in the codebook of level 1 is the compressed first precoding matrix set; and/or The first precoding matrix set corresponding to the first codebook index in the codebook of level 2 is the compressed first precoding matrix set.
Specifically, the following situations are as follows: 1. In the 4antenna codebook, the codebook of level 1 is compressed by any one of the foregoing methods 1 to 3, and the codebook of level 2 is not compressed; 2. the 4 antenna codebook The codebook of level 1 is compressed by any one of the foregoing methods 1 to 3, and the codebook of level 2 is compressed by any one of the foregoing methods 1 to 3; 3. In the 4 antenna codebook, The codebook of level 1 is not compressed, and the level is 2 The codebook is compressed in any of the above manners 1 to 3.
Further, in step 12, the terminal determines, according to the set joint coding rule, a joint coding value corresponding to the first PMI of the first codebook index indicating the precoding matrix, where the set joint coding rule specifically includes If the first precoding matrix set corresponding to the first codebook index in the codebook of level 1 is the compressed first precoding matrix set, the joint coding value corresponding to RI=1 in the joint coding rule and the first The number of codebook indexes is the same as the number of precoding matrices included in the compressed first precoding matrix set, and each joint coded value corresponds to a different first codebook index; if the codebook of level 2 is If the first precoding matrix set corresponding to the first codebook index is the compressed first precoding matrix set, the joint coding value corresponding to RI=2 and the number of the first codebook index in the joint coding rule are both The compressed first precoding matrix set includes the same number of precoding matrices, and each joint encoding value corresponds to a different first codebook index.
Take N as 16 as an example to illustrate the joint coding rule:
1. The codebook with RI=1 is compressed by mode 1, and the codebook with RI=2 is not compressed. Then the RI is combined with the first PMI to encode a total of 5 bits of information. The corresponding joint coding rules are as shown in Table 12A:
2. The codebook of RI=1 and the codebook of RI=2 are compressed by mode one, and the RI and the first PMI are combined to encode a total of five bits of information, and the corresponding joint coding rules are as shown in Table 12B:
3. The codebook with RI=1 is not compressed, and the codebook with RI=2 is compressed by mode 1. The RI and the first PMI are combined to encode a total of 5 bits of information. The corresponding joint coding rules are shown in Table 12C:
4. The codebook with RI=1 is compressed by mode 1, and the codebook with RI=2 is not compressed. Then, the RI and the first PMI are combined to encode a total of 5 bits of information, and the corresponding joint coding rules are as shown in Table 12D: 12D
5. The codebook with RI=1 is compressed by mode 2, and the codebook with RI=2 is compressed by mode 1. The joint code of RI and the first PMI is 5 bits, and the corresponding joint coding rules are as shown in Table 12E. Show:
6. The codebook with RI=1 is compressed by mode 2, and the codebook with RI=2 is compressed by mode 2. The joint code of RI and the first PMI is 5 bits, and the corresponding joint coding rules are as shown in Table 12F. Show: Table 12F
7. The codebook with RI=1 is not compressed, and the codebook with RI=2 is compressed by mode 2. The RI and the first PMI are jointly encoded and have a total of 5 bits of information. The corresponding joint coding rules are shown in Table 12G:
8. The codebook with RI=1 and the codebook with RI=2 are compressed by mode three, and the codebook with RI=2 is compressed by mode three, then the RI and the first PMI are combined to encode a total of 4 bits of information, corresponding to The joint coding rules are shown in Table 12H:
It should be noted that only the eight preferred codebook compression schemes are listed above. The compression mode (ie, mode one to mode three) provided by the embodiment of the present invention further includes other codebook compression schemes, such as the code of RI=1. In the first mode, the codebook with compression and RI=2 is compressed by mode 2. For example, the codebook with RI=1 is compressed by mode 3 and the codebook with RI=2 is compressed by mode 2. For example, RI The codebook of =1 is compressed by mode three and the codebook of RI=2 is not compressed, and so on, since the joint coding rule is similar to the joint coding rule corresponding to the above eight preferred codebook compression schemes, it is not one by one here. for example.
In the embodiment of the present invention, the structure of the compressed 4antenna codebook used by the terminal and the base station may be notified by the terminal to notify the base station, or may be notified by the base station, and may be notified by the terminal and the base station. It can also be specified in the protocol or standard, as long as it can ensure that the structure of the compressed 4antenna codebook used between the terminal and the base station is consistent; the set joint coding rule can be determined by the terminal and then notified to the base. The station may also be notified by the base station to notify the terminal, and may also be agreed by the terminal and the base station, and may also be specified in the protocol or standard, as long as the terminal and the base station can be understood to understand the set joint coding rules. .
Based on the foregoing embodiment, the embodiment of the present invention further provides a method for receiving channel state information based on a codebook. Referring to FIG. 2, the method includes: Step 21: The base station sends indication information to the terminal, where the indication information is used. Instructing the terminal to feed back channel status information and the feedback mode used in the feedback; preferably, the indication information can be sent by control signaling (such as DCI).
Step 22: The base station receives the joint coded value of the RI and the first PMI sent by the terminal according to the feedback mode according to the feedback mode, and receives the coded 4 antenna codebook sent by the terminal at another feedback time. a second PMI and a CQI of the second codebook index of the precoding matrix; and step 23, the base station determines the received association according to the set joint coding rule The RI corresponding to the encoded value and the first codebook index of the precoding matrix.
The joint coding rule defines a joint coding value I _{ RI/PMI 1} , RI of the RI and the first PMI, and a first codebook index ( i _{1} ) of the precoding matrix in the compressed 4antenna codebook. Correspondence.
Further, after determining the first codebook index and the second codebook index of the precoding matrix in the compressed 4antenna codebook sent by the terminal, the base station may determine the terminal recommendation from the compressed 4antenna codebook. Precoding matrix.
In the embodiment of the present invention, the 4antenna codebook refers to a codebook for performing precoding matrix indication information feedback and including a first codebook index and a second codebook index, and a first codebook. The index ranges from 0 to N1, where N is an integer greater than 1. The compressed 4antenna codebook refers to a first precoding matrix set corresponding to the first codebook index in the 4antenna codebook. a codebook formed by compressing the first precoding matrix set and the second precoding matrix set corresponding to the second codebook index, and the compressed first precoding matrix set includes precompression A partial precoding matrix in the first precoding matrix set.
In an implementation, the compressed first precoding matrix set adopts any of the following preferred structures: Method 1: dividing the precoding matrix in the first precoding matrix set before compression into a group, wherein each of the two precoding matrices included in the group has the same discrete Fourier transform DFT vector; arbitrarily selecting one from each group of precoding matrices as a precoding matrix in the compressed first precoding matrix set; For details, see the description on the terminal side, and details are not mentioned here.
Where N is an even number.
Manner 2, dividing the precoding matrix in the first precoding matrix set before compression into The group, wherein the first column DFT vector of the two precoding matrices included in each group is an adjacent DFT vector; preprogrammed from each group; for details, refer to the description on the terminal side, and details are not described herein again.
Where N is an even number.
In order to further improve the transmission reliability of the PUCCH, the RI can be further reduced. The number of information bits of the joint coded value of the first PMI, for example, the number of information bits of the joint coded value of the RI and the first PMI is reduced to 4 bits, preferably, the compressed first precoding matrix set The following preferred structure may also be adopted: mode 3, arbitrarily selecting a partial precoding matrix in the compressed first precoding matrix set, and using the selected precoding matrix as a precoding matrix in the final compressed first precoding matrix set; For details, refer to the description on the terminal side, and details are not described here.
For example, arbitrarily selecting 7 precoding matrixes from the first precoding matrix set compressed by using mode 1 or mode 2 as the final compressed first precoding matrix set, so that the joint coding of the RI and the first PMI is performed. The number of information bits for the value is 4 bits.
In an implementation, the compressed 4antenna codebook adopts the following structure: the first precoding matrix set corresponding to the first codebook index in the codebook of level 1 is the compressed first precoding matrix set; and/or The first precoding matrix set corresponding to the first codebook index in the codebook of level 2 is the compressed first precoding matrix set.
Specifically, the following situations are as follows: 1. In the 4antenna codebook, the codebook of level 1 is compressed by any one of the foregoing methods 1 to 3, and the codebook of level 2 is not compressed; 2. the 4 antenna codebook The codebook of level 1 is compressed by any one of the foregoing methods 1 to 3, and the codebook of level 2 is compressed by any one of the foregoing methods 1 to 3; 3. In the 4 antenna codebook, The codebook of level 1 is not compressed, and the codebook of level 2 is compressed by any of the above methods 1 to 3.
Further, if the first precoding matrix set corresponding to the first codebook index in the codebook of level 1 is the compressed first precoding matrix set, the joint coding value corresponding to RI=1 in the joint coding rule and the first The number of one codebook index is the same as the number of precoding matrices included in the compressed first precoding matrix set, and each joint coded value corresponds to a different first code. For the index, refer to the description of the terminal side. If the first precoding matrix set corresponding to the first codebook index in the codebook of level 2 is the compressed first precoding matrix set, the joint coding rule is RI= 2, the corresponding joint code value and the number of the first codebook index are the same as the number of precoding matrices included in the compressed first precoding matrix set, and each joint code value corresponds to a different first codebook. Index, see the description on the terminal side.
The above method processing flow can be implemented by a software program, which can be stored in a storage medium, and when the stored software program is called, the above method steps are performed.
Based on the same inventive concept, a terminal is provided in the embodiment of the present invention. The principle of solving the problem is similar to the method for sending the channel state information based on the codebook. Therefore, the implementation of the terminal can refer to the channel state based on the codebook. The implementation of the method of sending information will not be repeated here.
As shown in FIG. 3, the terminal provided by the embodiment of the present invention includes: a first determining module 31, configured to determine, after receiving the indication information sent by the base station, from the compressed 4antenna codebook, the RI and the a precoding matrix used by the second determining module 32, configured to determine, according to the set joint coding rule, an RI determined by the first determining module 31 and a first code index indicating the first codebook matrix of the precoding matrix a joint coding value corresponding to the PMI; the feedback module 33 is configured to send the determined joint code value to the base station at the set feedback time according to the feedback mode indicated in the indication information, and use the set time at another set feedback time The second PMI and the channel quality indicator CQI indicating the second codebook index of the precoding matrix are sent to the base station; wherein the 4 antenna codebook is used to perform precoding matrix indication information feedback in 4 pilot configurations. And a codebook including a first codebook index and a second codebook index, where the first codebook index ranges from 0 to N1, where N is an integer greater than one; the compressed four antenna codebook is Refers to the first codebook in the 4antenna codebook The first precoding matrix set corresponding to the index is compressed, a codebook formed by the compressed first precoding matrix set and the second precoding matrix set corresponding to the second codebook index, where the compressed first precoding matrix set includes the first precoding matrix set before compression Partial precoding matrix.
Preferably, the compressed first precoding matrix set adopts any of the following preferred structures: mode 1: dividing the precoding matrix in the first precoding matrix set before compression into a group, wherein each of the two precoding matrices included in the group has the same discrete Fourier transform DFT vector; arbitrarily selecting one from each group of precoding matrices as a precoding matrix in the compressed first precoding matrix set; Manner 2, dividing the precoding matrix in the first precoding matrix set before compression into a group, wherein a first column DFT vector of two precoding matrices included in each group is an adjacent DFT vector; arbitrarily selecting one from each set of precoding matrices as precoding in the compressed first precoding matrix set matrix.
Where N is an even number.
Preferably, the compressed first precoding matrix set may also adopt the following preferred structure: mode three, arbitrarily selecting a partial precoding matrix in the compressed first precoding matrix set, and using the selected precoding matrix as the final compressed A precoding matrix in the first set of precoding matrices.
Preferably, the compressed 4antenna codebook adopts the following structure: the first precoding matrix set corresponding to the first codebook index in the codebook of level 1 is the compressed first precoding matrix set; and/or, the level The first precoding matrix set corresponding to the first codebook index in the codebook of 2 is the compressed first precoding matrix set.
Further, if the first precoding matrix set corresponding to the first codebook index in the codebook of level 1 is the compressed first precoding matrix set, the RI=1 pair in the joint coding rule The number of the joint code value and the first codebook index are the same as the number of precoding matrices included in the compressed first precoding matrix set, and each joint code value corresponds to a different first codebook index. If the first precoding matrix set corresponding to the first codebook index in the codebook of level 2 is the compressed first precoding matrix set, the joint coding value corresponding to RI=2 in the joint coding rule and the first The number of codebook indexes is the same as the number of precoding matrices included in the compressed first precoding matrix set, and each joint coded value corresponds to a different first codebook index.
Based on the same inventive concept, a base station is further provided in the embodiment of the present invention. Since the principle of the base station solving the problem is similar to the method for receiving the channel state information based on the codebook, the implementation of the base station can be referred to based on the codebook. The implementation of the method for receiving the channel status information will not be repeated here.
As shown in FIG. 4, the base station provided by the embodiment of the present invention includes: a sending module 41, configured to send an indication information to the terminal, where the indication information is used to indicate the status information of the feedback channel of the terminal and the feedback mode used by the feedback. The receiving module 42 is configured to receive, according to the feedback mode, a joint coding value of the RI and the first PMI sent by the terminal at the set feedback time, and receive the compressed information sent by the terminal for indicating the compression at another set feedback time. The second PMI and the CQI of the second codebook index of the precoding matrix in the 4 antenna codebook; the processing module 43 is configured to determine the RI corresponding to the received joint code value and the precoding matrix according to the set joint coding rule. a first codebook index, where the 4 antenna codebook is a codebook for performing precoding matrix indication information feedback and including a first codebook index and a second codebook index in a configuration of 4 pilots, The value of a codebook index ranges from 0 to N1, where N is an integer greater than 1. The compressed 4antenna codebook refers to the first precoding matrix corresponding to the first codebook index in the 4antenna codebook. Collection pressure And a codebook formed by the compressed first precoding matrix set and the second precoding matrix set corresponding to the second codebook index, where the compressed first precoding matrix set includes the first precoding before compression Moment Part of the precoding matrix in the array.
Preferably, the compressed first precoding matrix set adopts any of the following preferred structures: mode 1: dividing the precoding matrix in the first precoding matrix set before compression into a group, wherein each of the two precoding matrices included in the group has the same discrete Fourier transform DFT vector; arbitrarily selecting one from each group of precoding matrices as a precoding matrix in the compressed first precoding matrix set; Manner 2, dividing the precoding matrix in the first precoding matrix set before compression into a group, wherein a first column DFT vector of two precoding matrices included in each group is an adjacent DFT vector; arbitrarily selecting one from each set of precoding matrices as precoding in the compressed first precoding matrix set matrix.
Where N is an even number.
Preferably, the compressed first precoding matrix set may also adopt the following structure: mode three, arbitrarily selecting a partial precoding matrix in the compressed first precoding matrix set, and using the selected precoding matrix as the final compressed first A precoding matrix in a set of precoding matrices.
Preferably, the compressed 4antenna codebook includes: the first precoding matrix set corresponding to the first codebook index in the codebook of level 1 is the compressed first precoding matrix set; and/or, the level is 2. The first precoding matrix set corresponding to the first codebook index in the codebook is a compressed first precoding matrix set.
Further, if the first precoding matrix set corresponding to the first codebook index in the codebook of level 1 is the compressed first precoding matrix set, the joint coding value corresponding to RI=1 in the joint coding rule and the first The number of one codebook index is the same as the number of precoding matrices included in the compressed first precoding matrix set, and each joint coded value corresponds to a different first code. If the first precoding matrix set corresponding to the first codebook index in the codebook of level 2 is the compressed first precoding matrix set, the joint coding value corresponding to RI=2 in the joint coding rule and The number of the first codebook index is the same as the number of precoding matrices included in the compressed first precoding matrix set, and each joint coded value corresponds to a different first codebook index.
The structure and processing manner of the terminal provided by the embodiment of the present invention are described below in conjunction with a specific hardware structure.
As shown in FIG. 5, the terminal at least includes: a memory 51, a processor 52, and an antenna 53, wherein: the memory 51 stores at least a compressed 4antenna codebook and a set joint coding rule; and the antenna 53 receives The indication information sent by the base station triggers the processor 52 to perform feedback of the channel status information; the processor 52, under the trigger of the antenna 53, determines the RI and the used RI from the compressed 4antenna codebook stored in the memory 51. Precoding matrix; determining, according to the set joint coding rule stored in the memory 51, the joint code value corresponding to the first PMI indicating the first codebook index of the precoding matrix, and receiving according to the antenna 53 The feedback mode indicated in the indication information indicates that the antenna 53 transmits the joint code value determined by itself to the base station at the set feedback time, and at the other set feedback time, the second code indicating the precoding matrix. The second PMI and CQI of the codebook index are sent to the base station.
The 4antenna codebook is a codebook for performing precoding matrix indication information feedback and includes a first codebook index and a second codebook index, and the value of the first codebook index is used in the four pilots. The range is 0 to N1, where N is an integer greater than 1. The compressed 4antenna codebook is obtained by compressing the first precoding matrix set corresponding to the first codebook index in the 4antenna codebook. a codebook consisting of the compressed first precoding matrix set and the second precoding matrix set corresponding to the second codebook index, the compressed first precoding matrix set including the first precoding before compression A partial precoding matrix in a matrix set.
It should be noted that the specific structure of the compressed first precoding matrix set and the set joint coding rules are described in the method part, and details are not described herein again.
Referring to FIG. 6, the base station includes at least: a memory 61, a processor 62, and an antenna 63, wherein: the memory 61 stores at least a compressed 4antenna codebook, and a set joint coding rule; and an antenna 63. Under the triggering of the processor 62, the indication information is sent to the terminal, and the indication information is used to indicate the feedback status of the channel information and the feedback mode used by the current request. And, under the trigger of the processor 62, according to the feedback mode, The set feedback time, the joint code value of the RI sent by the terminal and the first PMI, and the second codebook index sent by the terminal for indicating the precoding matrix in the compressed 4antenna codebook at another set feedback time The second PMI and CQI, and trigger the processor 62 to work; the processor 62, under the trigger of the antenna 63, determines the RI corresponding to the received joint code value and the first from the set joint coding rule stored in the memory 61. The codebook index further determines, from the compressed 4antenna codebook stored in the memory 61, the received first codebook index and the precoding matrix corresponding to the second codebook index.
The 4antenna codebook is a codebook for performing precoding matrix indication information feedback and includes a first codebook index and a second codebook index, and the value of the first codebook index is used in the four pilots. The range is 0 to N1, where N is an integer greater than 1. The compressed 4antenna codebook is obtained by compressing the first precoding matrix set corresponding to the first codebook index in the 4antenna codebook. a codebook formed by the compressed first precoding matrix set and the second precoding matrix set corresponding to the second codebook index, where the compressed first precoding matrix set includes the first precoding matrix set before compression Part of the precoding matrix.
It should be noted that the specific structure of the compressed first precoding matrix set and the set joint coding rules are described in the method part, and details are not described herein again.
Those skilled in the art will appreciate that embodiments of the present invention can be provided as a method, system, or computer program product. Thus, the present invention can take the form of a fully hardware embodiment, a fully software embodiment, or an embodiment combining soft and hardware aspects. Moreover, the present invention may take the form of a computer program product embodied on one or more computer usable storage media (including but not limited to disk memory, CDROM, optical memory, etc.) containing computer usable code therein. .
The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus, and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, a special purpose computer, an embedded processor or other programmable data processing device to produce a machine for executing instructions by a processor of a computer or other programmable data processing device Means are provided for implementing the functions specified in one or more of the flow or in one or more blocks of the flow chart.
The computer program instructions can also be stored in a computer readable memory that can boot a computer or other programmable data processing device to operate in a particular manner, such that instructions stored in the computer readable memory produce an article of manufacture including the instruction device. The instruction means implements the functions specified in one or more blocks of the flow or in a flow or block diagram of the flowchart.
These computer program instructions can also be loaded onto a computer or other programmable data processing device to perform a series of operational steps on a computer or other programmable device to produce computerimplemented processing on a computer or other programmable device. The instructions executed above provide steps for implementing the functions specified in one or more blocks of the flowchart or in a block or blocks of the flowchart.
While the preferred embodiment of the invention has been described, it will be understood that Therefore, the appended claims are intended to be construed as including the preferred embodiments and the scope of the invention There are changes and modifications.
It is apparent that those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and modifications of the invention
11~13‧‧‧Steps
Claims (20)
 A method for transmitting channel state information based on a codebook, wherein the method comprises: after receiving the indication information sent by the base station, determining, by the terminal, the level indication RI and the used a precoding matrix; the terminal determines, according to the set joint coding rule, a joint coding value corresponding to the PMI of the first precoding matrix indicating the first codebook index of the precoding matrix; the terminal according to the indication information The feedback mode indicated in the medium, at the set feedback time, the determined joint code value is sent to the base station, and at another set feedback time, the second PMI for indicating the second codebook index of the precoding matrix is used. And the channel quality indicator CQI is sent to the base station; wherein the 4 antenna codebook refers to a code for performing precoding matrix indication feedback and including the first codebook index and the second codebook index in 4 pilot configurations. The value of the first codebook index ranges from 0 to N1, where N is an integer greater than 1. The compressed 4antenna codebook refers to the first codebook index in the 4antenna codebook. The first precoding matrix set is compressed, and the codebook consisting of the compressed first precoding matrix set and the second precoding matrix set corresponding to the second codebook index, the compressed first precoding matrix set A partial precoding matrix in the first precoding matrix set before compression is included.
 The method for transmitting a codebookbased channel state information according to claim 1, wherein the compressed first precoding matrix set is: mode one, precoding in the first precoding matrix set before compression Matrix division a group, wherein each of the two precoding matrices included in the group has the same discrete Fourier transform DFT vector; and one of the precoding matrices included in each group is arbitrarily selected as the precoding matrix in the compressed first precoding matrix set; Or, in the second manner, dividing the precoding matrix in the first precoding matrix set before compression into a group, wherein a first column DFT vector of two precoding matrices included in each group is an adjacent DFT vector; arbitrarily selecting one from each set of precoding matrices as precoding in the compressed first precoding matrix set matrix.
 The method for transmitting a codebookbased channel state information according to claim 2, wherein the compressed first precoding matrix set adopts the following structure: mode three, arbitrarily selecting the compressed first precoding matrix set The partial precoding matrix uses the selected precoding matrix as a precoding matrix in the final compressed first precoding matrix set.
 The method for transmitting a channelbased channel state information according to any one of claims 1 to 3, wherein the compressed 4antenna codebook adopts the following structure: a first codebook index in a codebook of level 1 The corresponding first precoding matrix set is a compressed first precoding matrix set; and/or the first precoding matrix set corresponding to the first codebook index in the codebook of level 2 is the compressed first preamble A collection of coding matrices.
 The method for transmitting a codebookbased channel state information according to claim 4, wherein the first precoding matrix set corresponding to the first codebook index in the codebook of level 1 is the compressed first precoding matrix And the number of the joint code value corresponding to RI=1 and the number of the first codebook index in the joint coding rule are the same as the number of precoding matrices included in the compressed first precoding matrix set, and each The joint code value corresponds to a different first codebook index; If the first precoding matrix set corresponding to the first codebook index in the codebook of level 2 is the compressed first precoding matrix set, the joint coding value and the first code corresponding to RI=2 in the joint coding rule The number of the index is the same as the number of precoding matrices included in the compressed first precoding matrix set, and each joint encoding value corresponds to a different first codebook index.
 A method for receiving channel state information based on a codebook, the method comprising: the base station transmitting the indication information to the terminal, where the indication information is used to indicate the feedback status information of the terminal and the feedback mode used in the feedback; According to the feedback mode, the base station receives the joint coded value of the RI and the first PMI sent by the terminal at the set feedback time, and receives the 4 antennas sent by the terminal for indicating the compression at another set feedback time. a second PMI and a CQI of the second codebook index of the precoding matrix in the codebook; the base station determines, according to the set joint coding rule, an RI corresponding to the received joint coding value and a first codebook index of the precoding matrix The 4antenna codebook refers to a codebook for performing precoding matrix indication information feedback and including a first codebook index and a second codebook index in a 4pilot configuration, and the first codebook index is taken. The value ranges from 0 to N1, where N is an integer greater than 1. The compressed 4antenna codebook refers to the first precoding matrix corresponding to the first codebook index in the 4antenna codebook. a codebook formed by compressing the first precoding matrix set and the second precoding matrix set corresponding to the second codebook index, and the compressed first precoding matrix set includes the precompression A partial precoding matrix in a precoding matrix set.
 The method for receiving a codebookbased channel state information according to claim 6, wherein the compressed first precoding matrix set adopts the following structure: mode one, the first precoding matrix set before the compression Precoding matrix a group, wherein each of the two precoding matrices included in the group has the same discrete Fourier transform DFT vector; and one of the precoding matrices included in each group is arbitrarily selected as the precoding matrix in the compressed first precoding matrix set; Or, in the second manner, dividing the precoding matrix in the first precoding matrix set before compression into a group, wherein a first column DFT vector of two precoding matrices included in each group is an adjacent DFT vector; arbitrarily selecting one from each set of precoding matrices as precoding in the compressed first precoding matrix set matrix.
 The method for receiving a codebookbased channel state information according to claim 7, wherein the compressed first precoding matrix set adopts the following structure: mode three, arbitrarily selecting the compressed first precoding matrix set The partial precoding matrix uses the selected precoding matrix as a precoding matrix in the final compressed first precoding matrix set.
 The method for receiving a channelbased channel state information according to any one of the preceding claims, wherein the compressed 4antenna codebook adopts the following structure: a first codebook in a codebook of level 1 The first precoding matrix set corresponding to the index is the compressed first precoding matrix set; and/or the first precoding matrix set corresponding to the first codebook index in the codebook of level 2 is the compressed first Precoding matrix set.
 The method for receiving a codebookbased channel state information according to claim 9, wherein the first precoding matrix set corresponding to the first codebook index in the codebook of level 1 is compressed After the first precoding matrix set, the joint coding value corresponding to RI=1 and the number of the first codebook index in the joint coding rule are both the precoding matrix included in the compressed first precoding matrix set. The number is the same, and each joint code value corresponds to a different first codebook index; if the codebook of level 2 has a first precoding matrix set corresponding to the first codebook index, the first precoding matrix is compressed. The set, the number of joint code values corresponding to RI=2 and the number of first codebook indexes in the joint coding rule are the same as the number of precoding matrices included in the compressed first precoding matrix set, and each The joint code value corresponds to a different first codebook index.
 A terminal, comprising: a first determining module, configured to: after receiving the indication information sent by the base station, determine the RI and the used precoding matrix from the compressed 4antenna codebook; a second determining module, configured to determine, according to the set joint coding rule, a joint coding value corresponding to the first precoding matrix indicating PMI of the first codebook index indicating the precoding matrix; the feedback module, For transmitting, according to the feedback mode indicated in the indication information, the determined joint coded value to the base station at the set feedback time, and at the other set feedback time, the second code used to indicate the precoding matrix The second PMI and the channel quality indication CQI of the index are sent to the base station; wherein the 4antenna codebook is used to perform precoding matrix indication feedback in the four pilot configurations, and includes the first codebook index and the first The codebook of the two codebook index, the first codebook index ranges from 0 to N1, where N is an integer greater than one; the compressed four antenna codebook refers to the fourth antenna codebook The first corresponding to a codebook index a second precompiled corresponding to the compressed first precoding matrix set and the second codebook index obtained by compressing a precoding matrix set A codebook consisting of a set of code matrices, the compressed first precoding matrix set comprising a partial precoding matrix in the first precoding matrix set before compression.
 The terminal according to claim 11, wherein the compressed first precoding matrix set adopts the following structure: Method 1: dividing the precoding matrix in the first precoding matrix set before compression into a group, wherein each of the two precoding matrices included in the group has the same discrete Fourier transform DFT vector; and one of the precoding matrices included in each group is arbitrarily selected as the precoding matrix in the compressed first precoding matrix set; Or, in the second manner, dividing the precoding matrix in the first precoding matrix set before compression into a group, wherein a first column DFT vector of two precoding matrices included in each group is an adjacent DFT vector; arbitrarily selecting one from each set of precoding matrices as precoding in the compressed first precoding matrix set matrix.
 The terminal according to claim 12, wherein the compressed first precoding matrix set adopts the following structure: mode three, arbitrarily selecting a part of the precoding matrix in the compressed first precoding matrix set, and selecting the pre The coding matrix is used as a precoding matrix in the final compressed first precoding matrix set.
 The terminal according to any one of claims 11 to 13, wherein the compressed 4antenna codebook adopts the following structure: the first precoding matrix set corresponding to the first codebook index in the codebook of level 1 is a compressed first precoding matrix set; and/or, The first precoding matrix set corresponding to the first codebook index in the codebook of level 2 is the compressed first precoding matrix set.
 The terminal according to claim 14, wherein, if the first precoding matrix set corresponding to the first codebook index in the codebook of level 1 is the compressed first precoding matrix set, the RI in the joint coding rule The number of the joint code value and the first codebook index corresponding to =1 are the same as the number of precoding matrices included in the compressed first precoding matrix set, and each joint code value corresponds to a different first. a codebook index; if the first precoding matrix set corresponding to the first codebook index in the codebook of level 2 is the compressed first precoding matrix set, the joint coding value corresponding to RI=2 in the joint coding rule And the number of the first codebook index is the same as the number of precoding matrices included in the compressed first precoding matrix set, and each joint coded value corresponds to a different first codebook index.
 A base station, the base station includes: a sending module, configured to send an indication information to the terminal, where the indication information is used to indicate the feedback status information of the terminal and the feedback mode used in the feedback; the receiving module And receiving, according to the feedback mode, a joint coded value of the RI and the first PMI sent by the terminal at the set feedback time, and receiving, at another set feedback time, the 4 antennas sent by the terminal for indicating compression. a second PMI and a CQI of the second codebook index of the precoding matrix in the codebook; and a processing module, configured to determine, according to the set joint coding rule, an RI corresponding to the received joint coding value and a first of the precoding matrix a codebook index, where the 4 antenna codebook is a codebook for performing precoding matrix indication information feedback and including a first codebook index and a second codebook index in a 4 pilot configuration, the first codebook Indexed The value ranges from 0 to N1, where N is an integer greater than 1. The compressed 4antenna codebook refers to compressing the first precoding matrix set corresponding to the first codebook index in the 4antenna codebook. And a codebook formed by the compressed first precoding matrix set and the second precoding matrix set corresponding to the second codebook index, where the compressed first precoding matrix set includes the first precompression A partial precoding matrix in a set of coding matrices.
 The base station according to claim 16, wherein the compressed first precoding matrix set adopts the following structure: Method 1: dividing the precoding matrix in the first precoding matrix set before compression into a group, wherein each of the two precoding matrices included in the group has the same discrete Fourier transform DFT vector; and one of the precoding matrices included in each group is arbitrarily selected as the precoding matrix in the compressed first precoding matrix set; Or, in the second manner, dividing the precoding matrix in the first precoding matrix set before compression into a group, wherein a first column DFT vector of two precoding matrices included in each group is an adjacent DFT vector; arbitrarily selecting one from each set of precoding matrices as precoding in the compressed first precoding matrix set matrix.
 The base station according to claim 17, wherein the compressed first precoding matrix set adopts the following structure: mode three, arbitrarily selects a part of the precoding matrix in the compressed first precoding matrix set, and selects The precoding matrix is used as a precoding matrix in the final compressed first precoding matrix set.
 The base station according to any one of claims 16 to 18, wherein the compressed 4 antenna codebook The following structure is adopted: the first precoding matrix set corresponding to the first codebook index in the codebook of level 1 is the compressed first precoding matrix set; and/or the first codebook in the codebook of level 2 The first precoding matrix set corresponding to the index is a compressed first precoding matrix set.
 The base station according to claim 19, wherein, if the first precoding matrix set corresponding to the first codebook index in the codebook of level 1 is the compressed first precoding matrix set, the joint coding rule is The joint code value corresponding to RI=1 and the number of first codebook indexes are the same as the number of precoding matrices included in the compressed first precoding matrix set, and each joint code value corresponds to a different number. a codebook index; if the first precoding matrix set corresponding to the first codebook index in the codebook of level 2 is the compressed first precoding matrix set, the joint coding corresponding to RI=2 in the joint coding rule The value and the number of the first codebook index are the same as the number of precoding matrices included in the compressed first precoding matrix set, and each joint coded value corresponds to a different first codebook index.
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