WO2014194842A1  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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 WO2014194842A1 WO2014194842A1 PCT/CN2014/079283 CN2014079283W WO2014194842A1 WO 2014194842 A1 WO2014194842 A1 WO 2014194842A1 CN 2014079283 W CN2014079283 W CN 2014079283W WO 2014194842 A1 WO2014194842 A1 WO 2014194842A1
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 precoding matrix
 codebook
 compressed
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 codebook index
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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
Method and device for transmitting channel state information based on codebook This application claims to be submitted to the Chinese Patent Office on June 06, 2013, with the application number 201310224583.1, and the invention name is
The priority of the Chinese Patent Application, which is incorporated herein by reference. TECHNICAL FIELD The present application relates to the field of communications technologies, and in particular, to a method and apparatus for transmitting channel state information based on a codebook. Background technique
At present, the Long Term EvolutionAdvanced (LTEA) system supports 10 transmission modes and 4 physical uplink control channel (PUCCH) reporting modes. Based on the semistatic configuration of the highlayer signaling, the terminal (User Equipment, UE; also referred to as the user equipment) periodically feeds back different channel shield identifiers on the PUCCH using the PUCCH reporting mode (Reporting Mode) as shown in Table 1. Channel Quality Indication (CQI), Precoding Matrix Indication (PMI), and Rank Indication (RI).
Table 1
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 report no PMI/RI, mode 10 and mode 20 are supported.
Transmission mode 9: If the UE is configured to report PMI/RI and the number of CSIRS ports is greater than 1, the mode 11 and mode are supported.
21 ;
If the UE is configured to have no PMI/RI report or the number of CSIRS ports is 1, mode 1 0 and mode 20 are supported.
Transmission mode 10: If the UE is configured to report PMI/RI and the number of CSIRS ports is greater than 1, the mode 11 and mode are supported.
21 ;
If the UE is configured to have no PMI/RI report or the number of CSIRS ports is 1, mode 1 0 and mode 20 are supported.
Among them, the reporting mode 11 is used for feedback RI, wideband PMI and wideband CQI.
In the PMI calculation, when the number of antenna ports (CRS port or CSIRS port) is 4, the codebook used is shown in Table 2:
Table 2
However, in order to improve the feedback accuracy of the channel state information in the case of the 4antenna port, the codebook of the 4antenna port is enhanced in the new LTEA version (R12, Release12). Possible enhancements to the codebook include: Codebook enhancement scheme 1
w, where n = 0,1,.., 15
1 1 _{:} ] 2π/32
Where q _{x} e
<
And YG {e _{1?} e _{2} ,e _{3} ,e _{4} } and a(i) = q _{}}
And (Y _{1?} Y _{2} ) = (3⁄4 _{?} 3⁄4) ), (e _{2} , e _{2} ), (e _{3} , e _{3} ), (e _{4} , e _{4} ), (e , e _{2} ), (e _{2} , e _{3} ), (e , e _{4} ), (e _{2} or;
Codebook enhancement scheme 2 where n = 0,1,.., 15
" 1 1 1 1
X = where q _{x} =e ^{j27rl 2}
For rankl, W _{2}
And Ye {^,^ _{2} , _{3⁄4} ,^ _{4} } and a{i) = 3⁄4
For rank 2. w _{2}十 Yi
And e _{2} ), (e _{3} , e _{3} ), (e _{4} , e _{4} )} and
In the case of Rank3 and Rank4 in the above two enhancement schemes, the codebook of the existing 4antenna port 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 may also choose to use the enhanced codebook for feedback of channel state information. The enhanced codebook and the existing codebook use different codebook structures, which are embodied in: in the existing codebook, one codebook index corresponds to one precoding matrix, and the enhanced codebook uses two codebook indexes. Corresponding to a precoding matrix, that is, a precoding matrix in the enhanced codebook needs to be determined by a pair of codebook indexes (recorded as the first codebook index and the second codebook index), and therefore, the existing PUCCHModel1 cannot be supported. The user uses the enhanced codebook for feedback of RI, wideband PMI, wideband CQI, and subband CQI. In summary, in the case of a 4antenna port, there is currently no specific scheme for feedback of channel state information based on the enhanced codebook. SUMMARY OF THE INVENTION The embodiments of the present invention provide a method and a device for transmitting channel state information based on a codebook, which are used to solve the problem that the channel state information is not based on the enhanced codebook in the case of a 4antenna port. The problem with the program.
An embodiment of the present application provides a method for sending channel state information based on a codebook, including:
After receiving the indication information sent by the base station, the terminal determines the rank indication RI and the used precoding matrix from the compressed 4 antenna codebook;
Determining, by the terminal, the joint coding value corresponding to the first precoding matrix indicating the PMI of the first codebook index of the precoding matrix according to the set joint coding rule;
The terminal sends the determined joint coding value to the base station at a set feedback moment according to the feedback mode indicated in the indication information, and is used to indicate the precoding at another set feedback moment. The second PMI of the second codebook index of the matrix and the channel shield quantity indication CQI are sent to the base station;
The 4 antenna codebook is a codebook for performing precoding matrix indication feedback and including a first codebook index and a second codebook index, and a value range of the first codebook index. 0 N1 , where N is an integer greater than 1; the compressed 4 antenna codebook is obtained by compressing a first precoding matrix set corresponding to the first codebook index in the 4 antenna 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 before compression A partial precoding matrix in a matrix set.
Preferably, the compressed first precoding matrix set is:
Manner 1: The precoding matrix in the first precoding matrix set before compression is divided into groups, wherein each of the two precoding matrices included in the group has the same discrete Fourier transform DFT vector; Arbitrarily selecting one of the coding matrices as a precoding matrix in the compressed first precoding matrix set;
Or,
Manner 2: The precoding matrix in the first precoding matrix set before compression is divided into groups, wherein a first column DFT vector of two precoding matrices included in each group is an adjacent DF T vector; One of the precoding matrices is arbitrarily selected as the precoding matrix in the compressed first precoding matrix set.
Preferably, the compressed first precoding matrix set uses the following structure:
Method 3, 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.
Preferably, the compressed 4antenna codebook uses the following structure: The first precoding matrix set corresponding to the first codebook index in the codebook of rank 1 is the compressed one. a set of precoding matrices; and/or,
The first precoding matrix set corresponding to the first codebook index in the codebook of rank 2 is the compressed first precoding matrix set.
Preferably, if the first precoding matrix set corresponding to the first codebook index in the codebook of rank 1 is the compressed first precoding matrix set, the joint coding corresponding to RI=1 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 first precoding matrix set corresponding to the first codebook index in the codebook of rank 2 is the compressed first precoding matrix set, and 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.
An embodiment of the present application provides a method for receiving channel state information based on a codebook, including:
The base station sends the indication information to the terminal, where the indication information is used to indicate that the terminal feeds back the channel state information and the feedback mode used by the current feedback;
Receiving, according to the feedback mode, the joint coding value of the RI and the first PMI sent by the terminal, and receiving the indication sent by the terminal for the indication at another set feedback moment. a second PMI and a CQI of the second codebook index of the precoding matrix in the compressed 4antenna codebook;
Determining, by the base station, the RI corresponding to the received joint coding value and the first codebook index of the precoding matrix according to the set joint coding rule;
The 4 antenna 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 configuration of the four pilot ports. The range is 0 N1 , where N is an integer greater than 1. The compressed 4 antenna codebook refers to compressing the first precoding matrix set corresponding to the first codebook index in the 4 antenna codebook. Obtaining, by the compressed first precoding matrix set and the second precoding matrix set corresponding to the second codebook index, 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 uses the following structure:
Manner 1: The precoding matrix in the first precoding matrix set before compression is divided into groups, wherein each of the two precoding matrices included in the group has the same discrete Fourier transform DFT vector; Arbitrarily selecting one of the coding matrices as a precoding matrix in the compressed first precoding matrix set;
or, Manner 2: The precoding matrix in the first precoding matrix set before compression is divided into groups, wherein a first column DFT vector of two precoding matrices included in each group is an adjacent DF T vector; One of the precoding matrices is arbitrarily selected as the precoding matrix in the compressed first precoding matrix set.
Preferably, the compressed first precoding matrix set uses 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 4antenna codebook uses the following structure: The first precoding matrix set corresponding to the first codebook index in the codebook with rank 1 is the compressed first a set of precoding matrices; and/or,
The first precoding matrix set corresponding to the first codebook index in the codebook of rank 2 is the compressed first precoding matrix set.
Preferably, if the first precoding matrix set corresponding to the first codebook index in the codebook of rank 1 is the compressed first precoding matrix set, the joint coding corresponding to RI=1 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 first precoding matrix set corresponding to the first codebook index in the codebook of rank 2 is the compressed first precoding matrix set, and 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.
An embodiment of the present application 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, a joint code value corresponding to the first precoding matrix indicating PMI of the first codebook index indicating the first codebook matrix of the precoding matrix;
a feedback module, configured to send, according to the feedback mode indicated in the indication information, the determined joint coding value to the base station at a set feedback moment, and at another set feedback moment, to indicate the a second PMI of the second codebook index of the precoding matrix and a channel shield indicating that the CQI is sent to the base station;
The 4 antenna codebook is a codebook for performing precoding matrix indication feedback and including a first codebook index and a second codebook index, and a value range of the first codebook index. 0 N1 , where N is an integer greater than 1; the compressed 4 antenna codebook is obtained by compressing a first precoding matrix set corresponding to the first codebook index in the 4 antenna 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 before compression A partial precoding matrix in a matrix set. Preferably, the compressed first precoding matrix set uses the following structure:
Manner 1: The precoding matrix in the first precoding matrix set before compression is divided into groups, wherein each of the two precoding matrices included in the group has the same discrete Fourier transform DFT vector; Arbitrarily selecting one of the coding matrices as a precoding matrix in the compressed first precoding matrix set;
Or,
Manner 2: The precoding matrix in the first precoding matrix set before compression is divided into groups, wherein a first column DFT vector of two precoding matrices included in each group is an adjacent DF T vector; One of the precoding matrices is arbitrarily selected as the precoding matrix in the compressed first precoding matrix set.
Preferably, the compressed first precoding matrix set uses 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 4antenna codebook uses the following structure: The first precoding matrix set corresponding to the first codebook index in the codebook of rank 1 is the compressed one. a set of precoding matrices; and/or,
The first precoding matrix set corresponding to the first codebook index in the codebook of rank 2 is the compressed first precoding matrix set.
Preferably, if the first precoding matrix set corresponding to the first codebook index in the codebook of rank 1 is the compressed first precoding matrix set, the joint coding corresponding to RI=1 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 first precoding matrix set corresponding to the first codebook index in the codebook of rank 2 is the compressed first precoding matrix set, and 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.
The embodiment of the present application provides another terminal, where the terminal at least includes: a memory, a processor, and an antenna, where: the memory stores at least a compressed 4antenna codebook, and a set joint coding rule;
The antenna receives the indication information sent by the base station, and triggers 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 the RI according to the joint coding rule stored in the memory, and And indicating a joint coding value corresponding to the first PMI of the first codebook index of the precoding matrix, and indicating the joint coding determined by the antenna at the set feedback moment according to the feedback mode indicated in the indication information received by the antenna The value is sent to the base station, and at another set feedback moment, the second PMI and CQI for indicating the second codebook index of the precoding matrix are sent to the base station. The 4 antenna 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 configuration of the four pilot ports. The range is 0 N1 , where N is an integer greater than 1; the compressed 4 antenna codebook is obtained by compressing the first precoding matrix set corresponding to the first codebook index in the 4 antenna 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 Partial precoding matrix in .
An embodiment of the present application provides a base station, including:
a sending module, configured to send, to the terminal, indication information, where the indication information is used to indicate that the terminal feeds back channel state information and a feedback mode used by the current feedback;
a receiving module, configured to receive, according to the feedback mode, a joint coded value of the RI and the first PMI sent by the terminal at a set feedback moment, and receive the sent by the terminal at another set feedback moment a second PMI and a CQI indicating a second codebook index of the precoding matrix in the compressed 4 antenna codebook;
a processing module, configured to determine, according to the set joint coding rule, an RI corresponding to the received joint code value and a first codebook index of the precoding matrix;
The 4 antenna 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 configuration of the four pilot ports. The range is 0 N1 , where N is an integer greater than 1. The compressed 4 antenna codebook refers to compressing the first precoding matrix set corresponding to the first codebook index in the 4 antenna codebook. Obtaining, by the compressed first precoding matrix set and the second precoding matrix set corresponding to the second codebook index, 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 uses the following structure:
Manner 1: The precoding matrix in the first precoding matrix set before compression is divided into groups, wherein each of the two precoding matrices included in the group has the same discrete Fourier transform DFT vector; Arbitrarily selecting one of the coding matrices as a precoding matrix in the compressed first precoding matrix set;
Or,
Manner 2: The precoding matrix in the first precoding matrix set before compression is divided into groups, wherein a first column DFT vector of two precoding matrices included in each group is an adjacent DF T vector; One of the precoding matrices is arbitrarily selected as the precoding matrix in the compressed first precoding matrix set.
Preferably, the compressed first precoding matrix set uses 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.
Based on any of the foregoing base station embodiments, preferably, the compressed 4antenna codebook uses the following structure: a first precoding matrix set corresponding to the first codebook index in the codebook of rank 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 rank 2 is the compressed first precoding matrix set.
Preferably, if the first precoding matrix set corresponding to the first codebook index in the codebook of rank 1 is the compressed first precoding matrix set, the joint coding corresponding to RI=1 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 first precoding matrix set corresponding to the first codebook index in the codebook of rank 2 is the compressed first precoding matrix set, and 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.
An embodiment of the present application provides another base station, where the base station includes at least: a memory, a processor, and an antenna, where: the memory stores at least a compressed 4antenna codebook, and a set joint coding rule;
The antenna sends the indication information to the terminal, where the indication information is used to indicate the feedback channel status information of the terminal and the feedback mode used in the current feedback, and is triggered by the processor according to the feedback mode. a predetermined feedback moment, the joint code value of the RI and the first PMI sent by the receiving terminal, and the second codebook sent by the terminal for indicating the precoding matrix in the compressed 4antenna codebook at another set feedback moment The second PMI of the index and
CQI, and trigger the processor to work;
The processor determines, according to the set joint coding rule stored in the memory 61, the RI corresponding to the received joint code value and the first codebook index, and further, the compressed 4 antennas stored in the memory. In the codebook, the received first codebook index and the precoding matrix corresponding to the second codebook index are determined.
The 4 antenna 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 configuration of the four pilot ports. The range is 0 N1 , where N is an integer greater than 1; the compressed 4 antenna codebook is obtained by compressing the first precoding matrix set corresponding to the first codebook index in the 4 antenna 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 Partial precoding matrix in .
In the embodiment of the present application, after receiving the indication information sent by the base station, the terminal determines the RI and the used precoding matrix from the compressed 4 antenna 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, according to the feedback mode indicated in the indication information, the determined joint code value to the base station, and Transmitting, to the base station, a second PMI and a CQI for indicating a second codebook index of the precoding matrix;
The base station sends indication information to the terminal to indicate the feedback status information of the channel and the feedback used in the feedback. According to the feedback mode, at the set feedback moment, the joint encoding value of the RI and the first PMI sent by the receiving terminal is received, and the second PMI and CQI sent by the terminal are received at another set feedback moment; Determining a joint coding rule, determining an RI corresponding to the received joint code value and a first codebook index;
It can be seen that the method and device for transmitting channel state information provided by the embodiment of the present application implements the 4antenna port case, based on the enhanced 4antenna codebook and the corresponding relationship defined in the set joint coding rule. The codebook performs feedback of channel state information. DRAWINGS
1 is a schematic flowchart of a method for transmitting channel state information based on a codebook according to an embodiment of the present disclosure; 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 disclosure; A schematic structural diagram of a first type of terminal provided by the application embodiment;
4 is a schematic structural diagram of a first base station according to an embodiment of the present application;
FIG. 5 is a schematic structural diagram of a second terminal according to an embodiment of the present disclosure;
FIG. 6 is a schematic structural diagram of a second base station according to an embodiment of the present application. detailed description
In the case of an antenna port, feedback of channel state information is performed based on the enhanced codebook.
To support dual PMI feedback, when the number of antenna ports (CRS port or CSIRS port) is 8, PUCCH reporting mode 11 further supports the following two submodes (Submode):
Submode l : 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 types: report type 3 for feedback RI; report type 2c for feedback CQI, first PMI and second PMI.
In the case of a 4antenna port, the precoding matrix in the enhanced codebook is obtained by 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. X The precoding matrix set includes The number of coding 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, wideband PMI (including the first PMI and the second PMI), wideband CQI, and subband CQI feedback; a method similar to the 8antenna port can be used. Submode 1 and Submode 2 are also supported in the case of a 4antenna port. 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 the 8antenna port in the case of the 4antenna port, the PUCCH mode 11 of the 8antenna port is The feedback method of submode 1 cannot be directly applied to the feedback of the 4antenna port.
The embodiment of the present application provides a method and a device for transmitting channel state information based on a codebook, which are used to solve the problem of channel state information feedback based on the enhanced codebook in the case of a 4antenna port. In the case of the 4antenna port, the PUCCH uplink mode 11 also supports the submode 1 of the PUCCH uplink mode 11 similar to the 8antenna port, that is, the report including the joint coding value of the feedback RI and the first PMI. Type, and a report type that feeds back the second PMI and CQI, using the above mode period 3⁄4RI, first PMI, second PMI, and CQI.
Since the codebook enhancement scheme that may be used in the case of 4 antenna ports includes RI=1, 4 bits are required to indicate the first PMI and 4 bits are used to represent the second PMI, and RI=2, 4 bits are required to represent the first PMI and 4 bits represent the second PMI, and RI=3 and RI=4, respectively, need to use 0 bits to indicate the first PMI and 4 bits to represent the second PMI, respectively, therefore, the RI and the first PMI are jointly encoded to include 2 ^{4} + 2 ^{4} +2 ^{Q} +2 ^{Q} = 34 states, 6 bits are required for 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 calculated based on the fed back RI and the first PMI. Therefore, the joint code value of the RI and the first PMI is erroneous in the feedback process, which may cause an error in feeding back the second PMI and CQI in the next feedback cycle. In the case of a 4antenna port, in order to ensure the transmission reliability of the PUCCH, the codebook of the 4antenna port 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 8antenna port, in the case of the 4antenna port, it is possible to use the following twodimensional table:
1, preclude the use of a codebook of the enhancement program obtained 4antenna codebook as shown in Table 3A and Table 3B, wherein, ^ and ^ are codebook index, codebook index represents a first ^, Z _{2} represents a second codebook index.
Table 3A: Codebook with RI = 1;
Table 3B _{:} codebook with RI=2;
2 obtained preclude the use of reinforcing codebook antenna codebook Scheme 4 As shown in Tables 4A and 4B, which are codebook ^ and ^, ^ represents a first codebook index, Z _{2} represents a second codebook index.
Table 4A: Codebook with RI = 1;
Table 4B: Codebook with RI = 2;
W ^{(1 f}
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 Between the precoding matrix, and/or the second codebook index and the precoding matrix, another corresponding order may be used to change the precoding matrix and the first codebook index, and the precoding matrix and the fourth antenna codebook. The corresponding order of the two codebook indexes does not affect the performance of the four antenna codebook.
The codebook compression schemes provided by the embodiments of the present application are 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. Designed with the corresponding order between precoding 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 it should still be considered as the same codebook compression scheme;
That is, for two codebook compression schemes, if the number of precoding matrices included in the compressed codebook is the same, and for any precoding matrix in any one of the compressed codebooks, it can always be compressed from another one. The exact same precoding matrix is found in the latter codebook, and the two codebook compression schemes are considered to be the same compression scheme.
The embodiments of the present application are further described in detail below with reference to the accompanying drawings.
Referring to FIG. 1, an embodiment of the present application provides a method for sending channel state information based on a codebook, where the method includes:
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.
The indication information is used to indicate that the terminal performs feedback of channel state information, and indicates a feedback mode used by 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 capability.
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.
The joint coding rule defines a correspondence between a joint coding value (denoted as ^i) corresponding to the first PMI, RI, and a first codebook index of the precoding matrix in the compressed 4antenna codebook. Relationship, the first PMI is used to refer to The first codebook index of the precoding matrix in the compressed 4antenna codebook is shown, and 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 moment according to the feedback mode indicated in the indication information, and sets the second PMI and CQI of the precoding matrix at another set feedback moment. Send 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 the second codebook of the precoding matrix in the compressed 4antenna codebook is correspond.
In the embodiment of the present application, 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 is 0 N1, where N is an integer greater than 1. The compressed 4 antenna codebook refers to compressing the first precoding matrix set corresponding to the first PMI in the 4 antenna codebook. The obtained codebook, 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 application is a second precoding matrix set corresponding to the compressed first precoding matrix set and the second codebook index, and the set codebook enhancement scheme is used. The obtained 4antenna codebook includes a partial precoding matrix in the 4antenna codebook before compression.
In the 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 that the compressed based 4 The total number of joint coding values of the RI and the first PMI determined by the antenna codebook is not more than 2 ^{N} , 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 the bit error rate under 5bit information, 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 2 ^{5} = 32, that is, the joint coding value of RI and the first PMI can only take 0~31;
If the system can tolerate the bit error rate under 4bit information, that is, Ν=4, 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 2 ^{4} =16, that is, The joint coding value of RI and the first PMI can only take 0~15.
In this embodiment, the compressed first precoding matrix set includes a partial precoding matrix in the first precoding matrix set before compression, that is, the compressed precoding matrix set includes a precoding matrix that is still compressed. a precoding matrix in the first precoding matrix set, 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 based on the compressed 4antenna codebook is not more than 2 ^{N} ;
For example, the first precoding matrix set corresponding to the first codebook I in the codebook of rank 1 in the 4antenna codebook is compressed to include only 15 precoding matrices, and the codebook of rank 2 The first precoding matrix set corresponding to one codebook index is compressed to include only 15 precoding matrices, and the RI determined based on the compressed 4 antenna codebook is combined with the first PMI. The total number of encoded values can be at least 31, only 5 bits are required;
For another example, the first precoding matrix set corresponding to the first codebook 1 in the codebook of rank 1 in the 4antenna codebook is compressed to include only 8 precoding matrices, and the first in the codebook with rank 2 The first precoding matrix set corresponding to the codebook I is compressed to include only 8 precoding matrices, and the total number of joint coding values of the RI and the first PMI determined based on the compressed 4 antenna codebook may be the minimum. For 18, only 5 bits are required; and so on.
In an implementation, the compressed first precoding matrix set uses any of the following preferred structures:
Manner 1: The precoding matrix in the first precoding matrix set before compression is divided into groups, wherein each group includes precoding matrices having the same Discrete Fourier Transform (DFT) vector; One of the precoding matrices is arbitrarily selected as a precoding matrix in the compressed first precoding matrix set.
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 the precoding matrix in the first precoding matrix set before compression into groups, wherein each group includes a precoding matrix with a first codebook index of n and a precoding matrix with a first codebook index of "+^, n The range of values is
( N
0 ~ y1 ; arbitrarily selecting one from each group of precoding matrices, the compressed first precoding matrix set includes all selected precoding matrices;
Specifically, taking N as an example, the precoding matrix in the first precoding matrix set before compression is divided into eight groups, each group includes a precoding matrix with a first codebook index of n and a first codebook. The precoding matrix with an index of n+8 is arbitrarily selected from each group of precoding matrices, and the compressed first precoding matrix set includes all the selected precoding matrices, where n=0, l, 2... ..., 7; whether the codebook enhancement scheme 1 or the codebook enhancement scheme 2 is used, the first precoding matrix corresponding to the nth first codebook index and the n+8th first in the enhanced codebook The set of column vectors included in the first precoding matrix corresponding to the codebook index is the same, except that the order of the 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 is as shown in Table 5A and Table 5B:
Table 5A: The first codebook index is n 0 1 2 3 4 5 6 7
Ww _{3}
h
8 9 10 11 12 13 14 15
Table 5B: The first codebook index is n
h
12 13 14 15 0 1 2 3
w w
h
4 5 6 7 8 9 10 11
!!
Comparing the two sets of precoding matrices at corresponding positions in Table 5 A and Table 5B, it can be seen that the DFT vectors v _{m} corresponding to the two are the same, except that φ _{η} is different by φ, that is, the DFT vectors are different. The order of arrangement in the precoding matrix is different. According to the law of the codebook design under the dual polarization antenna array, v _{m is} used to quantize the beam direction, and % is used to quantize the phase between the dual polarization arrays. Therefore, in the bipolar The compressed 4antenna codebook (ie, compressed by a pair of 4antenna codebooks) and the 4antenna codebook before 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 The precoding matrix of the first codebook index in the first precoding matrix set before compression is included.
For example, taking N 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:
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 The set contains the first codebook index in the first precoding matrix set before compression! ^ ~ (N1) 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:
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 sufficient 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: Table 7A: The first codebook index is n, and the codebook enhancement scheme 1 is used.
Table 7B: The first codebook index is n+8, and the codebook enhancement scheme 1 is used: 6 7 0 1
w ^{{1} w ^{2} w ^{(2)} w ^{(2)}
h
2 3 4 5
w ^{(2)} ;
h
12 13 8 9
w ^{2} l „
10 11 14 15 Comparing the two sets of precoding matrices at corresponding positions in Tables 7A and 7B, it can be seen that the vectors corresponding to the two are the same or the difference between the numbers of v _{m} and the same is the same, the only difference is that The phase between the dualpolarized arrays, therefore, the compressed 4antenna codebook and the 4antenna codebook before compression are applied to the first PMI and the second in the dualpolarized array.
PMI feedback performance has minimal impact.
As a preferred structure, the compressed first precoding matrix set includes a precoding matrix with a first codebook index of the first precoding matrix set before compression.
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: 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 kind of excellent
The first codebook index in the first precoding matrix set is! ^ ~ (Ni) 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), for example, 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 set of precoding matrices including 8 precoding matrices, such as:
X o  ' 1 1 1 1
w _{1 =} , Χ = q _{l} = e ^{j2} " ^{li2} , n = 0,    ;
0 X _ \ \ \ \
1 1
Another example is w _{1 =} q _{l} = W ^{/32} , « = 8,.,15;
The compression method ensures that the compressed 4antenna codebook contains 32 different Discrete Fourier Transform (DFT) vectors v _{m} = [1 ε ^{] 2π Μ β2} , m = 0, · ·■, 31 .
Manner 2: The precoding matrix in the first precoding matrix set before compression is divided into groups, wherein the first column DFT vector of the two precoding matrices in each group is an adjacent DFT vector; from each group of precoding matrices Any one of them is selected as the precoding matrix in the compressed first precoding matrix set. Where N is an even number. Wherein, the socalled adjacent DFT vector refers to two DFT vectors in which 1/32 takes two adjacent values and obtains t, such as V, based on Table 3Α, Table 3Β, Table 4Α, and Table 4Β A codebook compression index, a second codebook index, and a precoding matrix, where the codebook compression scheme is specifically:
The compressed first 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;
Regardless of whether the codebook enhancement scheme 1 or the codebook enhancement scheme 2 is used, the enhanced codebook takes 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 quantized beam direction can be uniformly thinned out. Therefore, the compressed 4antenna codebook (ie, the twopair 4antenna codebook is compressed in the dual mode) and the fourantenna before compression are used in the dualpolarized array. The codebook has minimal impact on the first and second feedback performance.
For example, taking the capture 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. The structure shown:
Table 9A
Table 9B
For example, taking N 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:
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 of the first codebook index in the first precoding matrix set before compression. The structure of the matrix is similar to the structure shown in Table 10A, and is no longer listed here.
For example, taking N 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:
Table 10B
It should be noted that, in the case of RI=2, the 4antenna codebook formed by the codebook enhancement scheme 2 can be compressed to include only the precoding of the first codebook index in the first precoding matrix set before compression. The structure of the matrix is similar to that shown in Table 10B, and is no longer listed 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, as in the compressed 4antenna codebook. The first codebook index is 0, 2, 4, ..., 14 or 1, 3, 5, ..., 15 , and may also be included in the compressed first precoding matrix set. The precoding matrix is renumbered (ie, the first codebook index corresponding to each precoding matrix is redefined), for example, the first codebook index in the compressed 4 antenna codebook is 08, as long as the terminal and the base station are guaranteed The understanding of the first codebook index in the compressed 4antenna codebook 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 set of precoding matrices including 8 precoding matrices, such as:
X o  ' 1 1 1 1
w _{1 =} , X = q _{l}
0 X \ q = ^{2 /32} ," = 0,2,4, , 14; or,
The compression method ensures that the compressed 4antenna codebook contains 16 equally spaced DFT vectors v _{m} = [\ ^{/32} ,"? = 0, 2, ~, 14 or = [1 ^{2 /32} ] ^{Τ} , Μ = 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 frame may be further reduced, for example, the number of information bits of the joint coded value of the RI and the first frame is reduced to 4 bits, preferably, The compressed first precoding matrix set can also use the following preferred structure:
Manner 3: arbitrarily select a partial precoding matrix in the first precoding matrix set after compression, and use the selected precoding matrix as a preamble in the final compressed first precoding matrix set. Encoding matrix.
For example, arbitrarily selecting 7 precoding matrixes from the first precoding matrix set compressed by using the first mode or the second mode as the final compressed first precoding matrix set, so that the RI and the first ΡΜΙ are The number of information bits of the joint coded 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 used;
Table 11A: RI = 1 and codebook enhancement scheme 1 or 2
For example, if N is 16 as an example, and RI=2, the first precoding matrix set compressed by the first mode is further compressed to obtain a structure as shown in Table 11B, where the code is used. This enhancement scheme 1;
Table 11B: RI = 2 and codebook enhancement scheme 1
For example, if N is 16 as an example, and RI=2, the first precoding matrix set compressed by the first mode is further compressed to obtain a structure as shown in Table 11C, where the code is used. This enhancement 2:
Table 11C: RI = 2 and codebook enhancement scheme 2
h
0 1 2 3
06).
"4 "4 "4 "4
h
h
4 5 6 7
06 w ^{(2h} "4
h
8 9 10 11
06 w ^{(2e} "4 "4
h
h
12 13 14 15
06 4 , 4
V V ,
Jt (). 1 V V ,
1 w ^{(2)b} =—
― ' ^ y _{m} ― ^{v} _{m} '
w ^{ii} =丄^{v}
Sr ^{v} _{m} ' V ,
V,
w ^{(2e} =― '  V
w ^{(2)f} =―
V , v In implementation, the compressed 4antenna codebook uses the following structure:
The first precoding matrix set corresponding to the first codebook index in the codebook of rank 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 rank 2 is the compressed first precoding matrix set.
Specifically includes the following:
1. In the 4antenna codebook, the codebook of rank 1 is compressed by any one of the foregoing manners 1 to 3, and the codebook of rank 2 is not compressed;
2. In the 4antenna codebook, the codebook of rank 1 is compressed by any one of the foregoing manners 1 to 3, and the codebook of rank 2 is compressed by any one of the foregoing manners 1 to 3.
3. In the 4antenna codebook, the codebook of rank 1 is uncompressed, and the codebook of rank 2 is compressed by any of the above methods 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 joint coding rule is set. Specifically, the method includes: if the first precoding matrix set corresponding to the first codebook index in the codebook of rank 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 precoding matrices included in the compressed first precoding matrix set, and each joint coded value corresponds to a different first codebook index;
If the first precoding matrix corresponding to the first codebook index in the codebook of rank 2 is the compressed first precoding moment In the ensemble set, the joint coding value corresponding to RI=2 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.
Take N as 16 as an example to illustrate the joint coding rule:
1. The codebook of RI=1 is compressed by mode 1, and the codebook of RI=2 is not compressed. Then, the RI is combined with the first PMI to encode a total of 5 bits of information, and the corresponding joint coding rule is as shown in Table 12A:
Table 12A
2. The codebook with RI=1 and the codebook with RI=2 are compressed by the first method. Then, the RI and the first PMI are combined to encode a total of 5 bits of information. The corresponding joint coding rules are as shown in Table 12B:
Table 12B
3. The codebook with RI=1 is not compressed, and the codebook with RI=2 is compressed by the first method. Then, the RI and the first PMI are jointly encoded with 5 bits of information. The corresponding joint coding rules are shown in Table 12C:
Table 12C
4. The codebook of RI=1 is compressed by mode 1, and the codebook of RI=2 is not compressed, then the RI and the first PMI are combined to encode the special information, and the corresponding joint coding rules are as shown in Table 12D: Table 12D
5. The codebook of RI=1 is compressed by mode 2, and the codebook of RI=2 is compressed by mode 1, and then the RI and the first PMI are jointly coded to have 5 bits of information, and the corresponding joint coding rule is shown in Table 12E. Shown as follows:
Table 12E
6. The codebook with RI=1 is compressed by the second method, and the codebook with RI=2 is compressed by the second method. 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 shown in Table 12F. Shown as follows:
Table 12F RI and first
PMI's association
RI h
Coding value
07 1 2
815 2 2 ( I _8 )
16 3 0
17 4 0
1831 Reserved NA
7. The codebook with RI=1 is not compressed, and the codebook with RI=2 is compressed by the second method. Then, the RI and the first PMI are combined to encode a total of 5 bits of information. The corresponding joint coding rules are as shown in Table 12G:
Table 12G
8. The codebook of RI=1 and the codebook of RI=2 are all compressed by the third method, and the codebook of RI=2 is compressed by the third method, and the RI and the first PMI are combined to encode a total of 4 bits of information. The corresponding joint coding rules are shown in Table 12H: Table 12H
It should be noted that only the eight preferred codebook compression schemes are listed above. According to the compression mode provided by the embodiment of the present application (ie, mode one to mode three), other codebook compression schemes, such as the code of RI=1, are also included. The codebook of the first method is compressed and the codebook of RI=2 is compressed by the second method. For example, the codebook of RI=1 is compressed by the third mode, and the codebook of RI=2 is compressed by the second mode. For another example, the codebook of RI=1 is compressed by mode three and the codebook of RI=2 is not compressed, and the like, since the joint coding rule is similar to the joint coding rule corresponding to the above eight preferred codebook compression schemes, No longer  an example.
In the embodiment of the present application, the structure of the compressed 4antenna codebook used by the terminal and the base station may be determined by the terminal. After the base station is notified, the terminal may also notify the terminal after determining by the base station, and may also be agreed by the terminal and the base station, and may also be specified in the protocol or the standard, as long as the compressed 4antenna codebook used between the terminal and the base station can be guaranteed. The structure can be understood consistently;
The set joint coding rule may be notified by the terminal to notify the base station, or may be notified by the base station to notify the terminal, or may be agreed by the terminal and the base station, or may be specified in a protocol or a standard, as long as the terminal and the base station can be guaranteed It is sufficient to understand the set joint coding rules.
Based on the foregoing embodiment, the embodiment of the present application 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 the indication information to the terminal, where the indication information is used to indicate that the terminal feeds back the channel state information and the feedback mode used by the feedback.
Preferably, the indication information can be sent by using control signaling (such as DCI).
Step 22: The base station receives, 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 receives the compressed 4 antenna code code sent by the terminal at another feedback time. a second PMI and CQI of the second codebook index of the precoding matrix;
Step 23: The base station determines, according to the set joint coding rule, an RI corresponding to the received joint code value and a first codebook index of the precoding matrix.
The joint coding rule defines a joint coding value of the RI and the first PMI / ^ _{/ 3⁄4} ^, RI, and a first codebook index ( ^ ) of the precoding matrix in the compressed 4antenna codebook. Correspondence relationship.
Further, after determining the first codebook I 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 application, 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 is 0 N1, where Ν 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. a codebook formed by the compressed first precoding matrix set and the second precoding matrix set corresponding to the second codebook index, and the compressed first precoding matrix set includes a precompression A partial precoding matrix in a precoding matrix set.
In an implementation, the compressed first precoding matrix set uses any of the following preferred structures:
Manner 1: The precoding matrix in the first precoding matrix set before compression is divided into groups, wherein each of the two precoding matrices included in the group has the same discrete Fourier transform DFT vector; the precoding matrix included from each group The arbitrarily selected one is used as the precoding matrix in the compressed first precoding matrix set. For details, refer to the description on the terminal side, and details are not described herein again.
Where N is an even number. Manner 2: The precoding matrix in the first precoding matrix set before compression is divided into groups, 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 mentioned here.
Where N is an even number.
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 coding value of the RI and the first PMI is reduced to 4 bits, preferably, The compressed first precoding matrix set can also use the following preferred 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. For details, refer to the description on the terminal side. I will not repeat them here.
For example, arbitrarily selecting 7 precoding matrixes from the first precoding matrix set compressed by using the first mode or the second mode as the final compressed first precoding matrix set, so that the RI and the first PMI are The number of information bits of the joint coded value is 4 bits.
In implementation, the compressed 4antenna codebook uses the following structure:
The first precoding matrix set corresponding to the first codebook index in the codebook of rank 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 rank 2 is the compressed first precoding matrix set.
Specifically includes the following:
1. In the 4antenna codebook, the codebook of rank 1 is compressed by any one of the foregoing methods 1 to 3, and the codebook of rank 2 is not compressed;
2. In the 4antenna codebook, the codebook of rank 1 is compressed by any one of the foregoing manners 1 to 3, and the codebook of rank 2 is compressed by any one of the foregoing manners 1 to 3.
3. In the 4antenna codebook, the codebook of rank 1 is uncompressed, and the codebook of rank 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 rank 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 codebook index. For details, refer to the description of the terminal side. ;
If the first precoding matrix set corresponding to the first codebook index in the codebook of rank 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 number. For a 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 shield, 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 application. 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 codebookbased channel. The implementation of the method of transmitting the status information will not be repeated here.
As shown in FIG. 3, the terminal provided by the embodiment of the present application includes:
The first determining module 31 is 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 32, configured to determine, according to the set joint coding rule, a joint code value that is determined by the first determining module 31 and a first PMI that is used to indicate a first codebook index of the precoding matrix;
The feedback module 33 is configured to send, according to the feedback mode indicated in the indication information, the determined joint coding value to the base station at the set feedback moment, and at another set feedback moment, the reference code matrix is used to indicate the precoding matrix. The second PMI of the second codebook index and the channel shield quantity indicate that the CQI is sent to the base station;
The 4 antenna 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 configuration of the four pilot ports. The range is 0 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 a part of the first precoding matrix set before compression Precoding matrix.
Preferably, the compressed first precoding matrix set uses any of the following preferred structures:
Manner 1: The precoding matrix in the first precoding matrix set before compression is divided into groups, wherein each of the two precoding matrices included in the group has the same discrete Fourier transform DFT vector; the precoding matrix included from each group Any one of them is selected as a precoding matrix in the compressed first precoding matrix set;
Manner 2: The precoding matrix in the first precoding matrix set before compression is divided into groups, where the first column DFT vector of the two precoding matrices included in each group is an adjacent DFT vector; from each group of precoding matrices Any one of them is selected as the precoding matrix in the compressed first precoding matrix set.
Where N is an even number.
Preferably, the compressed first precoding matrix set may also adopt the following preferred 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 4antenna codebook uses the following structure:
The first precoding matrix set corresponding to the first codebook index in the codebook of rank 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 rank 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 rank 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 codebook index;
If the first precoding matrix set corresponding to the first codebook index in the codebook of rank 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.
Based on the same inventive concept, a base station is further provided in the embodiment of the present application. The principle of the problem solved by the base station is similar to the method for receiving the channel state information based on the codebook. Therefore, the implementation of the base station can refer to the codebookbased channel. The implementation of the method of receiving the status information will not be repeated here.
As shown in FIG. 4, the base station provided by the embodiment of the present application includes:
The sending module 41 is configured to send, to the terminal, indication information, where the indication information is used to indicate that the terminal feeds back the channel state information and the feedback mode used by the current 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 a set feedback moment, and receive the indication sent by the terminal after the compression at another set feedback moment. a second PMI and CQI of the second codebook index of the precoding matrix in the 4antenna codebook;
The processing module 43 is configured to determine, according to the set joint coding rule, an RI corresponding to the received joint code value and a first codebook index of the precoding matrix;
The 4 antenna 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 configuration of the four pilot ports. The range is 0 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 a part of the first precoding matrix set before compression Precoding matrix.
Preferably, the compressed first precoding matrix set uses any of the following preferred structures:
Manner 1: The precoding matrix in the first precoding matrix set before compression is divided into groups, wherein each group includes Two precoding matrices have the same discrete Fourier transform DFT vector; arbitrarily select one from each set of precoding matrices as a precoding matrix in the compressed first precoding matrix set;
Manner 2: The precoding matrix in the first precoding matrix set before compression is divided into groups, where the first column DFT vector of the two precoding matrices included in each group is an adjacent DFT vector; from each group of precoding matrices Any one of them is selected as the precoding matrix in the compressed first precoding matrix set.
Where N is an even number.
Preferably, the compressed first precoding matrix set may also adopt 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 4antenna codebook comprises:
The first precoding matrix set corresponding to the first codebook index in the codebook of rank 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 rank 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 rank 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 codebook index;
If the first precoding matrix set corresponding to the first codebook index in the codebook of rank 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.
The structure and processing manner of the terminal provided by the embodiment of the present application are described below in conjunction with the specific hardware structure. Referring to 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;
The antenna 53 receives the indication information sent by the base station, and triggers the processor 52 to perform feedback of the channel state information. The processor 52 determines the RI and the compressed 4antenna codebook stored in the memory 51 under the trigger of the antenna 53. a precoding matrix to be used; determining, according to a joint coding rule stored in the memory 51, a joint coding value corresponding to the first PMI indicating the first codebook index of the precoding matrix, and according to the antenna 53 The feedback mode indicated in the received indication information indicates that the antenna 53 transmits the joint coded value determined by itself to the base station at the set feedback moment, and at another set feedback moment, the reference code is used to indicate the precoding matrix. The second PMI and CQI of the second codebook index are sent to the base station. The 4 antenna 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 configuration of the four pilot ports. The range is 0 N1 , where N is an integer greater than 1; the compressed 4 antenna codebook is obtained by compressing the first precoding matrix set corresponding to the first codebook index in the 4 antenna 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 Partial precoding matrix.
It should be noted that the specific structure of the compressed first precoding matrix set and the set joint coding rule are described in the method part, and are not described here.
Referring to FIG. 6, the base station at least includes: 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 the antenna 63 is processed. Under the triggering of the device 62, the indication information is sent to the terminal, and the indication information is used to indicate that the terminal feeds back the channel state information and the feedback mode used in the current feedback; and under the trigger of the processor 62, according to the feedback mode, the setting is a feedback timing, 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 moment Second PMI and CQI, and trigger processor 62 to work;
The processor 62 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 under the trigger of the antenna 63, and further, after the compression stored in the memory 61. In the 4antenna codebook, the received first codebook index and the precoding matrix corresponding to the second codebook index are determined.
The 4 antenna 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 configuration of the four pilot ports. The range is 0 N1 , where N is an integer greater than 1; the compressed 4 antenna codebook is obtained by compressing the first precoding matrix set corresponding to the first codebook index in the 4 antenna 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 Partial precoding matrix.
It should be noted that the specific structure of the compressed first precoding matrix set and the set joint coding rule are described in the method part, and are not described here.
Those skilled in the art will appreciate that embodiments of the present application can be provided as a method, system, or computer program product. Thus, the application can be in the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the application can be in the form of a computer program product embodied on one or more computerusable storage interfaces (including but not limited to disk storage, CDROM, optical storage, etc.) containing computer usable program code.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (system), and computer program products according to embodiments of the present application. It should be understood that each flow in the flowchart and/or block diagram can be implemented by computer program instructions. And/or blocks, and combinations of flows and/or blocks in the flowcharts and/or block diagrams. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.
The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computerimplemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.
Although the preferred embodiment of the present application has been described, those skilled in the art can make additional changes and modifications to the embodiments once they are aware of the basic inventive concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and the modifications and
It will be apparent to those skilled in the art that various modifications and changes can be made in the present application without departing from the spirit and scope of the application. Thus, it is intended that the present invention cover the modifications and variations of the present invention.
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