CN106856413A - A kind of method of method for generating codebooks and transfer pre-coding configured information, device - Google Patents
A kind of method of method for generating codebooks and transfer pre-coding configured information, device Download PDFInfo
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- CN106856413A CN106856413A CN201510889443.5A CN201510889443A CN106856413A CN 106856413 A CN106856413 A CN 106856413A CN 201510889443 A CN201510889443 A CN 201510889443A CN 106856413 A CN106856413 A CN 106856413A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna 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
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Abstract
Method, device the present embodiments relate to a kind of method for generating codebooks and transfer pre-coding configured information, for solving the problems, such as that existing codebook structure cannot meet the requirement of feedback overhead.A kind of method for generating codebooks includes：The first dimension index and the second dimension index uniform sampling to presetting the pre-coding matrix that code book is included, obtain S the first dimension index and S the second dimension index, wherein, S is that the maximum feedback bit number allowed according to system determines that S is the integer more than or equal to 1；The code book that the S the first dimension index pre-coding matrix corresponding with the individual second dimension indexes of the S is formed is defined as final code book, and again for pre-coding matrix the first dimension of distribution in the final code book is indexed and the second dimension index.
Description
Technical field
The present invention relates to communication technical field, more particularly to a kind of method for generating codebooks and transfer pre-coding configured information
Method, device.
Background technology
In current FDD (Frequency Division Duplex, FDD) Long Term Evolution (Long Term
Evolution, LTE) in system, the acquisition of downlink channel condition information (Channel State Information, CSI) is needed
User equipment (UE) is wanted using downlink reference signal (such as channel state information reference signals (Channel State
Information-Reference Signals, CSI-RS), cell own reference signal (Cell-specific
Reference Signals, CRS)) down channel is estimated, and feed back order instruction (Rank Indication, RI), pre-
Encoder matrix indicates (Precoding Matrix Indicator, PMI) and channel quality to indicate (Channel Quality
Indicator, CQI) to evolution base station (eNB) side.UE gives the correct time on CSI is carried out, and can be reported or non-week using periodicity
Phase property reports two ways.Wherein, feedback resources are limited, general no more than 11bit.
With the development of antenna technology, industry has gone out the active antenna being now able to each a period of time independent control.Using this
Design is planted, aerial array can be by the two-dimensional structure of present horizontally arranged enhancing to horizontal and vertical arrangement.This aerial array
Mode so that wave beam vertical direction dynamic adjustment be possibly realized.It is how defeated for the extensive multi input of this three-dimensional (3D)
Go out the codebook design of (Massive Multiple Input Multiple Output, Massive MIMO) aerial array, mesh
Before it is also proposed kinds of schemes, more unified viewpoint is that using two-stage codebook structure, i.e. pre-coding matrix W is prelisted by the first order
Code matrix W 1 is multiplied with second level pre-coding matrix W2 and obtains, and is expressed as：W=W1W2.Wherein, a kind of concrete implementation scheme is
Based on the extension of 8 antenna codebooks in version 12 (Rel-12), first order pre-coding matrix is by the direct computation of DFT of vertical dimensions
The DFT beam vectors subgroups of leaf transformation (Discrete Fourier Transform, DFT) beam vectors subgroup and horizontal dimensions
Carry out what Kronecker (kronecker) product was calculated, the second level carries out column selection in the beam vectors subgroup of the first order
With phase adjustment.PMI1 and PMI2 that eNB feeds back according to two-stage, generate final pre-coding matrix, for downlink data transmission.
Compare with current LTE code books, due to increased vertical dimensions packet, cause the code word number in W1 and/or W2 to increase, enter one
Step increased feedback overhead.
The periodic feedback mode of current LTE system, its design only takes into account the code book of 8 antennas, wherein rank=1,2 code
This feedback overhead is maximum, and W1 is 4bit (16 code words), and W2 is 4bit (16 code words).Employed for W1 and remove overlap wave beam
Code book under mining method, feedback overhead can be reduced to 3bit, such that it is able to RI combined codings feed back.And 3D MIMO
Code book is dramatically increased relative to 8 current antenna codebooks, its quantity, and when rank=1,2, W1 can be up to 9bit, even if using
It is existing to remove the lower mining method for overlapping wave beam, also W1 feedback overheads can only be reduced to 8bit, it is impossible to realize in limited resources
On periodic feedback.
In sum, because the number of codewords in code book increases, cause required feedback overhead to increase, with RI combined codings
During feedback, can there is a problem of the too high accurate delivery for being difficult to ensure that feedback information of encoding rate, so as to cannot realize limited anti-
Periodic feedback in feedback resource, therefore, existing codebook structure cannot meet the requirement of feedback overhead.
The content of the invention
Method, the device of a kind of method for generating codebooks and transfer pre-coding configured information are the embodiment of the invention provides, is used
In solving the problems, such as that existing codebook structure cannot meet the requirement of feedback overhead.
In a first aspect, a kind of method for generating codebooks is the embodiment of the invention provides, including：
The first dimension index and the second dimension index uniform sampling to presetting the pre-coding matrix that code book is included, obtain S
Individual first dimension index and S the second dimension index, wherein, S is that the maximum feedback bit number allowed according to system determines, S
It is the integer more than or equal to 1；
The S the first dimension index and the S the second dimension are indexed into the code book that corresponding pre-coding matrix is formed
It is defined as final code book, and again for the pre-coding matrix in the final code book distributes the first dimension index and the second dimension rope
Draw.
In possible implementation, the first dimension index and the second dimension to presetting the pre-coding matrix that code book is included
Index uniform sampling, obtains S the first dimension index and S the second dimension index, including：
The first dimension index of the pre-coding matrix that the default code book is included is divided into M1 groups, by the default code book
Comprising pre-coding matrix the second dimension index be divided into M2 groups, obtain M1*M2 index piecemeal, wherein, M1 be more than or
Integer equal to 1, M2 is the integer more than or equal to 1；
For index piecemeal each described, according to the first sampling interval, first dimension index is sampled, obtained
L the first dimensions index, wherein, L=S/ (M1*M2), L are the integer more than or equal to 1, and K1 represents in the index piecemeal the
The number of dimension index；And according to the second sampling interval, second dimension index is sampled, obtain L second
Dimension is indexed, wherein, K2 represents the number of the second dimension index in the index piecemeal.
In possible implementation, for index piecemeal each described, according to the first sampling interval, tieed up to described first
Degree index is sampled, and obtains L the first dimension index, including：According to the first sampling interval and the first index offset of setting
Value δ 1, samples to first dimension index, obtains L the first dimension index, wherein, δ 1 is integer and 0≤δ, 1≤K1；
And/or
For index piecemeal each described, according to the second sampling interval, second dimension index is sampled, obtained
L the second dimension index, including：According to the second sampling interval and the second index offset value δ 2 of setting, to second dimension
Index is sampled, and obtains L the second dimension index, wherein, δ 2 is integer and 0≤δ, 2≤K2.
In possible implementation, first sampling interval is determined using equation below：OrWherein, △ 1 is first sampling interval；
Second sampling interval is defined as using equation below：Or
Wherein, △ 2 is first sampling interval.
It is in possible implementation, the S the first dimension index and the S the second dimension index is corresponding pre-
The code book that encoder matrix is formed is defined as final code book, including：
Determine that the S the first dimension index and individual second dimensions of the S index the S index to be formed right；
Described S index is defined as final code book to the set that corresponding pre-coding matrix is formed.
In possible implementation, the S the first dimension index and the S individual first of S index centering
Dimension index is arranged according to the ordering rule of setting.
In possible implementation, the ordering rule includes：
The S the first dimensions index by order arrangement from big to small, and the S the second dimension index press from greatly to
Small order arrangement；Or
The S the first dimensions index by order arrangement from big to small, and the S the second dimension index press from it is small to
Big order arrangement；Or
The S the first dimensions index by order arrangement from small to large, and the S the second dimension index press from greatly to
Small order arrangement；Or
The S the first dimensions index by order arrangement from small to large, and the S the second dimension index press from it is small to
Big order arrangement.
Second aspect, there is provided a kind of method of transmission precoding configured information, the method includes：
According to channel measurement, pre-coding matrix is selected from code book, wherein, the code book is described in any of the above-described
Method generation code book；
The the first dimension index and the second dimension for sending the pre-coding matrix to network side are indexed.
The third aspect, a kind of method of reception precoding configured information, the method include：
Receive the first dimension index and the second dimension index that user equipment sends；
According to first dimension index and second dimension index, corresponding precoding square is determined from code book
Battle array, wherein, the code book is the code book of the method generation described in any of the above-described.
A kind of fourth aspect, code book generating means, device includes：
Indexed samples module, for the first dimension index and the second dimension rope to presetting the pre-coding matrix that code book is included
Draw uniform sampling, obtain the individual first dimension indexes of S and S the second dimension index, wherein, S is anti-according to the maximum of system permission
Feedback bit number determines that S is the integer more than or equal to 1；
Code book generation module, for the S the first dimension index and the S the second dimension to be indexed into corresponding prelisting
The code book that code matrix is formed is defined as final code book, and again for the pre-coding matrix in the final code book distributes the first dimension
Index and the second dimension index.
In possible implementation, the indexed samples module specifically for：
The first dimension index of the pre-coding matrix that the default code book is included is divided into M1 groups, by the default code book
Comprising pre-coding matrix the second dimension index be divided into M2 groups, obtain M1*M2 index piecemeal, wherein, M1 be more than or
Integer equal to 1, M2 is the integer more than or equal to 1；
For index piecemeal each described, according to the first sampling interval, first dimension index is sampled, obtained
L the first dimensions index, wherein, L=S/ (M1*M2), L are the integer more than or equal to 1, and K1 represents in the index piecemeal the
The number of dimension index；And according to the second sampling interval, second dimension index is sampled, obtain L second
Dimension is indexed, wherein, K2 represents the number of the second dimension index in the index piecemeal.
In possible implementation, the indexed samples module specifically for：
According to the first sampling interval and the first index offset value δ 1 of setting, first dimension index is sampled,
L the first dimension index is obtained, wherein, δ 1 is integer and 0≤δ, 1≤K1；And/or
According to the second sampling interval and the second index offset value δ 2 of setting, second dimension index is sampled,
L the second dimension index is obtained, wherein, δ 2 is integer and 0≤δ, 2≤K2.
In possible implementation, first sampling interval is determined using equation below：OrWherein, △ 1 is first sampling interval；
Second sampling interval is defined as using equation below：Or
Wherein, △ 2 is first sampling interval.
In possible implementation, the code book generation module specifically for：
Determine that the S the first dimension index and individual second dimensions of the S index the S index to be formed right；And will
The S index is defined as final code book to the set that corresponding pre-coding matrix is formed.
In possible implementation, S the first dimension index and S the first dimension index of S index centering
Ordering rule according to setting is arranged.
In possible implementation, the ordering rule includes：
The S the first dimensions index by order arrangement from big to small, and the S the second dimension index press from greatly to
Small order arrangement；Or
The S the first dimensions index by order arrangement from big to small, and the S the second dimension index press from it is small to
Big order arrangement；Or
The S the first dimensions index by order arrangement from small to large, and the S the second dimension index press from greatly to
Small order arrangement；Or
The S the first dimensions index by order arrangement from small to large, and the S the second dimension index press from it is small to
Big order arrangement.
A kind of 5th aspect, device for sending precoding configured information, device includes：
Selecting module, for according to channel measurement, pre-coding matrix being selected from code book, wherein, the code book is
The code book of any embodiment generation in first aspect；
Sending module, the first dimension index from the pre-coding matrix to network side and the second dimension for sending are indexed.
A kind of 6th aspect, device for receiving precoding configured information, device includes：
Receiver module, the first dimension index and the second dimension index for receiving user equipment transmission；
Determining module, for according to first dimension index and second dimension index, phase being determined from code book
The pre-coding matrix answered, wherein, the code book is the code book of any embodiment generation in first aspect.
7th aspect, there is provided another code book generating means, including：At least one processor and with the treatment
The memory of device connection, wherein：
The processor, for reading the program in the memory, performs following process：
The first dimension index and the second dimension index uniform sampling to presetting the pre-coding matrix that code book is included, obtain S
Individual first dimension index and S the second dimension index, wherein, S is that the maximum feedback bit number allowed according to system is determined
The number of the pre-coding matrix that code book is included, S is the integer more than or equal to 1；
The S the first dimension index and the S the second dimension are indexed into the code book that corresponding pre-coding matrix is formed
It is defined as final code book, and again for the pre-coding matrix in the final code book distributes the first dimension index and the second dimension rope
Draw.
In possible implementation, the processor reads the program in the memory, specific to perform：
The first dimension index of the pre-coding matrix that the default code book is included is divided into M1 groups, by the default code book
Comprising pre-coding matrix the second dimension index be divided into M2 groups, obtain M1*M2 index piecemeal, wherein, M1 be more than or
Integer equal to 1, M2 is the integer more than or equal to 1；
For index piecemeal each described, according to the first sampling interval, first dimension index is sampled, obtained
L the first dimensions index, wherein, L=S/ (M1*M2), L are the integer more than or equal to 1, and K1 represents in the index piecemeal the
The number of dimension index；And according to the second sampling interval, second dimension index is sampled, obtain L second
Dimension is indexed, wherein, K2 represents the number of the second dimension index in the index piecemeal.
In possible implementation, the processor reads the program in the memory, specific to perform：
According to the first sampling interval and the first index offset value δ 1 of setting, first dimension index is sampled,
L the first dimension index is obtained, wherein, δ 1 is integer and 0≤δ, 1≤K1；And/or
According to the second sampling interval and the second index offset value δ 2 of setting, second dimension index is sampled,
L the second dimension index is obtained, wherein, δ 2 is integer and 0≤δ, 2≤K2.
Wherein, it is related during first sampling interval and the setting in second sampling interval are referring specifically to first aspect
Description.
In possible implementation, the processor reads the program in the memory, specific to perform：
Determine that the S the first dimension index and individual second dimensions of the S index the S index to be formed right；And will
The S index is defined as final code book to the set that corresponding pre-coding matrix is formed.
Wherein, it is described S index to optional implementation referring specifically to the associated description in first aspect.
Eighth aspect, there is provided another kind sends the device of precoding configured information, including：Transceiver and the transmitting-receiving
At least one processor of machine connection and the memory being connected with the processor, wherein：
The processor, for reading the program in the memory, performs following process：
According to channel measurement, pre-coding matrix is selected from code book, wherein, the code book is appointing in first aspect
The code book of one embodiment generation；
The transceiver is used under the control of the processor, and the first dimension of the pre-coding matrix is sent to network side
Degree index and the second dimension index.
9th aspect, there is provided another kind sends the device of precoding configured information, including：Transceiver and the transmitting-receiving
At least one processor of machine connection and the memory being connected with the processor, wherein：
The transceiver is used under the control of the processor, receives the first dimension index and that user equipment sends
Two-dimensionses are indexed；
The processor, for reading the program in the memory, performs following process：
According to first dimension index and second dimension index, corresponding precoding square is determined from code book
Battle array, wherein, the code book is the code book of any embodiment generation in first aspect.
In method and apparatus provided in an embodiment of the present invention, the first dimension rope to presetting the pre-coding matrix that code book is included
Draw and index uniform sampling with the second dimension, obtain S the first dimension index and S the second dimension index；By the S first dimension
The code book that degree index and the corresponding pre-coding matrix of the individual second dimension indexes of the S are formed is defined as final code book, and is again
Pre-coding matrix in the final code book distributes the first dimension index and the second dimension index.The embodiment of the present invention is generated most
Pre-coding matrix in whole code book can be uniform in beam direction covering so that the final code book of generation disclosure satisfy that precoding is needed
Ask, and the final code book of embodiment of the present invention generation reduces the number of pre-coding matrix, disclosure satisfy that feedback overhead will
Ask.The final code book generated using the embodiment of the present invention is fed back, and can reduce feedback overhead, supports code book feedback higher
Load.
Brief description of the drawings
Fig. 1 is a kind of schematic flow sheet of method for generating codebooks that the embodiment of the present invention one is provided；
Fig. 2 is the signal of the first dimension index and the second dimension index of the pre-coding matrix that the embodiment of the present invention three is obtained
Figure；
Fig. 3 is the signal of the first dimension index and the second dimension index of the pre-coding matrix that the embodiment of the present invention four is obtained
Figure；
Fig. 4 is the signal of the first dimension index and the second dimension index of the pre-coding matrix that the embodiment of the present invention five is obtained
Figure；
Fig. 5 is the schematic flow sheet of the method for the transmission precoding configured information that the embodiment of the present invention six is provided；
Fig. 6 is the schematic flow sheet of the method for the reception precoding configured information that the embodiment of the present invention seven is provided；
Fig. 7 is a kind of schematic diagram of code book generating means that the embodiment of the present invention eight is provided；
Fig. 8 is a kind of schematic diagram of the device of transmission precoding configured information that the embodiment of the present invention nine is provided；
Fig. 9 is a kind of schematic diagram of the device of reception precoding configured information that the embodiment of the present invention ten is provided；
Figure 10 is the schematic diagram of another code book generating means that the embodiment of the present invention 11 is provided；
Figure 11 is the schematic diagram of another device for sending precoding configured information that the embodiment of the present invention 12 is provided；
Figure 12 is the schematic diagram of another device for receiving precoding configured information that the embodiment of the present invention 13 is provided.
Specific embodiment
The embodiment of the invention provides and adopt scheme under a kind of code book, the code book for obtaining is uniform in beam direction covering, uses
The code book of embodiment of the present invention generation is fed back, and can reduce feedback overhead.
The embodiment of the present invention is described in further detail with reference to Figure of description.It should be appreciated that described herein
Embodiment be merely to illustrate and explain the present invention, be not intended to limit the present invention.
A kind of method for generating codebooks is provided in the embodiment of the present invention one, as shown in figure 1, the method includes：
S11, the first dimension index and the second dimension index uniform sampling to presetting the pre-coding matrix that code book is included, obtain
To S the first dimension index and S the second dimension index, wherein, S is that the maximum feedback bit number allowed according to system determines
, S is the integer more than or equal to 1；
Wherein, the first dimension index can be the index of the horizontal dimensions of pre-coding matrix, or the precoding square
The index of the vertical dimensions of battle array.Accordingly, if the first dimension index can be the index of the horizontal dimensions of pre-coding matrix, the
Two-dimensionses index can be the index of the vertical dimensions of pre-coding matrix；If the first dimension index can be hanging down for pre-coding matrix
The index of straight dimension, then the second dimension index can be the index of the horizontal dimensions of pre-coding matrix.
In the embodiment of the present invention, the maximum feedback bit number (A) allowed according to system determines the value of S, and the value of S is less than or waits
In 2A。
S12, the S the first dimensions index and the S the second dimension are indexed what corresponding pre-coding matrix was formed
Code book is defined as final code book, and again for the pre-coding matrix in the final code book distributes the first dimension index and the second dimension
Degree index.
Optionally, the collection of the first dimension index redistributed is combined into { 0,1 ..., S-1 }, the second dimension redistributed
The collection of index is combined into { 0,1 ..., S-1 }.It is of course also possible to use other modes are the pre-coding matrix in the final code book
The first dimension index and the second dimension index are distributed, as long as ensureing that the first dimension index and the second dimension index corresponding bit number
The maximum feedback bit number for being allowed no more than system.
In the embodiment of the present invention, the first dimension index and the second dimension index to presetting the pre-coding matrix that code book is included
Uniform sampling, obtains S the first dimension index and S the second dimension index；By the S the first dimension index and the S
The code book that second dimension indexes corresponding pre-coding matrix formation is defined as final code book, and again in the final code book
Pre-coding matrix distributes the first dimension index and the second dimension index.Precoding in the final code book of embodiment of the present invention generation
Matrix can be uniform in beam direction covering so that the final code book of generation disclosure satisfy that the code requirement that prelists, and the present invention is real
Applying the final code book of example generation reduces the number of pre-coding matrix, disclosure satisfy that the requirement of feedback overhead.Using of the invention real
The final code book for applying example generation is fed back, and can reduce feedback overhead, supports code book feedback load higher.
The executive agent of above-mentioned steps S11~S12 can be user equipment (such as terminal), or network side (such as base
Stand), user equipment generates code book with network side using identical method, so that in follow-up feedback procedure, it is ensured that Yong Hushe
The standby understanding with network side to code book is consistent.
The embodiment of the present invention can apply to one-level code book, it is also possible to be applied to two-stage codebook, wherein, if being applied to two-stage
Code book, then the default code book in above-mentioned steps S11~step S12 can be first order code book in two-stage codebook, or
Second level code book in two-stage codebook.
Optionally, it is equal to presetting the first dimension index and the second dimension index of the pre-coding matrix that code book is included in S11
Even sampling, obtains S the first dimension index and S the second dimension index, including：
The first dimension index of the pre-coding matrix that the default code book is included is divided into M1 groups, by the default code book
Comprising pre-coding matrix the second dimension index be divided into M2 groups, obtain M1*M2 index piecemeal, wherein, M1 be more than or
Integer equal to 1, M2 is the integer more than or equal to 1；
For index piecemeal each described, according to the first sampling interval, first dimension index is sampled, obtained
L the first dimensions index, wherein, L=S/ (M1*M2), L are the integer more than or equal to 1, and K1 represents in the index piecemeal the
The number of dimension index；And according to the second sampling interval, second dimension index is sampled, obtain L second
Dimension is indexed, wherein, K2 represents the number of the second dimension index in the index piecemeal.
Wherein, the L the first dimensions index can be arranged by order from big to small, it is also possible to suitable by from small to large
Sequence is arranged.Likewise, the L the second dimensions index can be arranged by order from big to small, it is also possible to by from small to large
Order is arranged.The embodiment of the present invention not to the L the first dimensions index and the L the second dimension index put in order into
Row is limited, as long as ensureing that user equipment is consistent with network side understanding.
Optionally, first sampling interval is using equation below determination：Or
Wherein, △ 1 is first sampling interval.
Optionally, second sampling interval be defined as using equation below：Or
Wherein, △ 2 is first sampling interval.
Optionally, the first index offset value δ 1 is set, then for index piecemeal each described, according to the first sampling interval and
First index offset value δ 1 of setting, samples to first dimension index, obtains L the first dimension index, wherein, δ 1
It is integer and 0≤δ, 1≤K1；
And/or
Second index offset value δ 2 is set, then for index piecemeal each described, according to the second sampling interval and setting
Second index offset value δ 2, samples to second dimension index, obtains L the second dimension index, wherein, δ 2 is integer
And 0≤δ, 2≤K2.
It should be noted that the first index offset value can take identical value with the second index offset value, it is also possible to take not
Same value.
In force, the S the first dimension index and the S the second dimension are indexed into corresponding precoding in S12
The code book that matrix is formed is defined as final code book, including：
Determine that the S the first dimension index and individual second dimensions of the S index the S index to be formed right；
Described S index is defined as final code book to the set that corresponding pre-coding matrix is formed.
Wherein, the S the first dimensions index of S index centering and the S the first dimension index are according to setting
Fixed ordering rule is arranged.
As optional implementation：The ordering rule includes：
The S the first dimensions index by order arrangement from big to small, and the S the second dimension index press from greatly to
Small order arrangement；Or
The S the first dimensions index by order arrangement from big to small, and the S the second dimension index press from it is small to
Big order arrangement；Or
The S the first dimensions index by order arrangement from small to large, and the S the second dimension index press from greatly to
Small order arrangement；Or
The S the first dimensions index by order arrangement from small to large, and the S the second dimension index press from it is small to
Big order arrangement.
Above-mentioned to give under four kinds of preferred implementations, in force, the S index is any of the above-described to that can use
Mode is realized, but the invention is not restricted to above-mentioned implementation, can also use other modes, as long as ensureing user equipment and network
Side understands consistent.
In the embodiment of the present invention two provide a kind of two-stage codebook under adopt scheme, it is assumed that default two-stage codebook structure can
To be expressed as：
W=W1*W2；
Wherein, W represents pre-coding matrix, and W1 represents first order pre-coding matrix, and W2 represents second level pre-coding matrix.It is right
In the code book of 3D MIMO, one kind of W1 or W2 is achieved in that by the first dimension beam vectors group and the second dimension beam vectors group
Kronecker product be calculated.So, each pre-coding matrix of W1 or W2 can be by two indexes of dimension (i.e. first
Dimension is indexed and the second dimension index) determined.Illustrated by taking the pre-coding matrix of W1 as an example below, define its first dimension
It is i1 to index, the second dimension index be i2, wherein i1=0,1 ..., N1-1, i2=0,1 ..., N2-1, then each of W1 prelist
Code matrix is determined by (i1, i2).It should be noted that the first dimension index and the second dimension index here can remove weight
The index value that numbering is obtained is re-started after folded wave beam.
First, the first dimension index and the second dimension index for the W1 in default two-stage codebook being included are grouped,
It is specific as follows：
The first dimension index of W1 is divided into M1 groups, there is K1=N1/M1 the first dimension to index in each packet, its
In, the m1 packet is expressed as：
[(m1-1)·K1 (m1-1)·K1+1 … m1·K1-1]；
Wherein, m1=1 ..., M1.
Likewise, the second dimension index of W1 is divided into M2 groups, there is K2=N2/M2 the second dimension rope in each packet
Draw, wherein, the m2 packet is expressed as：
[(m2-1)·K2 (m2-1)·K2+1 … m2·K2-1]；
Wherein, m2=1 ..., M2.
So, in two-dimensional space, the M1*M2 index piecemeal of two dimension can be obtained, each Partitioning Expression of A is (m1, m2),
It has K1 index (i.e. the first dimension index has K1) in the first dimension, and second dimension has K2 index (i.e. the second dimension
Index has K2).
Then, the requirement according to feedback overhead selects corresponding index, tool in each index piecemeal according to setting rule
Body is as follows：
Assuming that needing the number of the first order pre-coding matrix that W1 is included to be compressed to S, S is whole more than or equal to 1
Number.To ensure that the S first order pre-coding matrix is evenly distributed in W1, each index piecemeal is corresponded to, it is necessary to select L=S/
(M1*M2) individual first dimension index and L the second dimension index, with (m1, m2) index piecemeal as a example by, specifically include：
First, K1 the first dimension index uniform sampling in piecemeal (m1, m2) will be indexed, the sampling interval is set toDefinitionIt is the corresponding first dimension index offset value of the index piecemeal, obtains following L
Individual first dimension index：
If 1) order by index value from small to large：
If 2) order by index value from big to small：
Here the corresponding first dimension index offset value of different index piecemealsCan be with identical, it is also possible to different.
If it should be noted that the first dimension index after above-mentioned sampling (is designated as ix) be more than m1K1-1, then by this
Dimension index is replaced using values below：mod(ix,K1)+(m1-1)·K1-1；
If the first dimension index after above-mentioned sampling (is designated as ix) less than (m1-1) K1 when, then by first dimension index
Replaced using values below：m1·K1-mod(K1-ix,K1)。
2nd, K2 the second dimension index uniform sampling in piecemeal (m1, m2) will be indexed, the sampling interval is set toDefinitionBe the corresponding second dimension index offset value of the index piecemeal, obtain with
Lower L the second dimension index：
If 1) order by index value from small to large：
If 2) order by index value from big to small：
Here the corresponding second dimension index offset value of different index piecemealsCan be with identical, it is also possible to different.
If it should be noted that the second dimension after above-mentioned sampling is indexed during more than m2K2-1, by second dimension
Index is replaced using values below：mod(ix,K2)+(m2-1)·K2-1；
If the second dimension index after above-mentioned sampling is less than (m2-1) K2, by second dimension index using following
Value replaces：m2·K2-mod(K2-ix,K2)。
Then, above-mentioned L the first dimension index and L the second dimension index are combined, obtain L codewords indexes
It is right, specially：
Or
Or
Or
When realizing, any of the above-described kind of combination is selected.
Finally, L codewords indexes will be obtained and is defined as final first order code to corresponding L first order pre-coding matrix
This, and again for the pre-coding matrix in the final first order code book distributes the first dimension index and the second dimension index.
Below by three specific embodiments, illustrate to be obtained using method for generating codebooks provided in an embodiment of the present invention sampling
Pre-coding matrix the first dimension index and the second dimension index.
In the embodiment of the present invention three, it is assumed that N1=16, N2=8, M1=2, M2=2, S=8,Then use code book generation side provided in an embodiment of the present invention
The first dimension index of the pre-coding matrix that method sampling is obtained and the second dimension are indexed as shown in Fig. 2 using institute in the present embodiment
State second index combination.
In the embodiment of the present invention four, N1=16, N2=8, M1=2, M2=1, S=8,Then
The first dimension index and the second dimension of the pre-coding matrix obtained using method for generating codebooks provided in an embodiment of the present invention sampling
Degree index is as shown in figure 3, using described the first index combination in the present embodiment.
In the embodiment of the present invention five, N1=16, N2=8, M1=2, M2=1, S=8, The first of the pre-coding matrix for then being obtained using method for generating codebooks provided in an embodiment of the present invention sampling
Dimension is indexed and the second dimension is indexed as shown in figure 4, using described the first index combination in the present embodiment.
A kind of method for sending precoding configured information is provided based on same inventive concept, in the embodiment of the present invention six,
As shown in figure 5, the method includes：
S51, according to channel measurement, pre-coding matrix is selected from code book, wherein, the code book be Fig. 1 shown in
The code book generated in embodiment；
S52, the first dimension index and the second dimension index that the pre-coding matrix is sent to network side.
The executive agent of above-mentioned steps S51~step S52 is user equipment (such as terminal).
In the embodiment of the present invention, due to being fed back using the final code book generated in the embodiment of the present invention one, can drop
Low feedback overhead, supports code book feedback load higher
A kind of method for receiving precoding configured information is provided based on same inventive concept, in the embodiment of the present invention six,
As shown in fig. 6, the method includes：
S61, the first dimension index and the second dimension index that receive user equipment transmission；
S62, according to first dimension index and second dimension index, corresponding precoding is determined from code book
Matrix, wherein, the code book is the code book generated in the embodiment shown in Fig. 1.
The executive agent of above-mentioned steps S61~step S62 is network side (such as base station).
In the embodiment of the present invention, due to being fed back using the code book generated in the embodiment of the present invention one, can reduce anti-
Feedback expense, supports code book feedback load higher.
Above method handling process can realize that the software program can be stored in storage medium with software program, when
When the software program of storage is called, above method step is performed.
Based on same inventive concept, a kind of code book generating means are provided in the embodiment of the present invention seven, as shown in fig. 7, should
Device includes：
Indexed samples module 71, for the first dimension index and the second dimension to presetting the pre-coding matrix that code book is included
Index uniform sampling, obtains S the first dimension index and S the second dimension index, wherein, S is the maximum allowed according to system
What number of bits of feedback determined, S is the integer more than or equal to 1；
Code book generation module 72, for the S the first dimension index and the S the second dimension index is corresponding pre-
The code book that encoder matrix is formed is defined as final code book, and again for the pre-coding matrix distribution first in the final code book is tieed up
Degree index and the second dimension index.
The code book generating means that the present embodiment is provided can be user equipment (such as terminal), or network side (such as base
Stand).
Optionally, the indexed samples module 71 specifically for：
The first dimension index of the pre-coding matrix that the default code book is included is divided into M1 groups, by the default code book
Comprising pre-coding matrix the second dimension index be divided into M2 groups, obtain M1*M2 index piecemeal, wherein, M1 be more than or
Integer equal to 1, M2 is the integer more than or equal to 1；
For index piecemeal each described, according to the first sampling interval, first dimension index is sampled, obtained
L the first dimensions index, wherein, L=S/ (M1*M2), L are the integer more than or equal to 1, and K1 represents in the index piecemeal the
The number of dimension index；And according to the second sampling interval, second dimension index is sampled, obtain L second
Dimension is indexed, wherein, K2 represents the number of the second dimension index in the index piecemeal.
Optionally, the indexed samples module 71 specifically for：
According to the first sampling interval and the first index offset value δ 1 of setting, first dimension index is sampled,
L the first dimension index is obtained, wherein, δ 1 is integer and 0≤δ, 1≤K1；And/or
According to the second sampling interval and the second index offset value δ 2 of setting, second dimension index is sampled,
L the second dimension index is obtained, wherein, δ 2 is integer and 0≤δ, 2≤K2.
Wherein, the setting in first sampling interval and second sampling interval is referring specifically to the embodiment shown in Fig. 1
In associated description.
Optionally, code book generation module 72 specifically for：Determine the S the first dimension index and the S second
It is right that dimension indexes the S index to be formed；And be defined as described S index to the set that corresponding pre-coding matrix is formed
Final code book.
Wherein, it is described S index to optional implementation retouched referring specifically to the correlation in the embodiment shown in Fig. 1
State.
A kind of device for sending precoding configured information is provided based on same inventive concept, in the embodiment of the present invention eight,
As shown in figure 8, the device includes：
Selecting module 81, for according to channel measurement, pre-coding matrix being selected from code book, wherein, the code book
The code book generated in embodiment shown in Fig. 1, referring specifically to the associated description in the embodiment shown in Fig. 1；
Sending module 82, the first dimension index from the pre-coding matrix to network side and the second dimension rope for sending
Draw.
A kind of device for receiving precoding configured information is provided based on same inventive concept, in the embodiment of the present invention nine,
As shown in figure 9, the device includes：
Receiver module 91, the first dimension index and the second dimension index for receiving user equipment transmission；
Determining module 92, for according to first dimension index and second dimension index, being determined from code book
Corresponding pre-coding matrix, wherein, the code book is the code book generated in the embodiment shown in Fig. 1, referring specifically to shown in Fig. 1
Associated description in embodiment.
Another code book generating means are provided based on same inventive concept, in the embodiment of the present invention ten, as shown in Figure 10,
The device includes：At least one processor 101 and the memory 102 being connected with the processor 101, wherein：
Processor 101, for reading the program in memory 102, performs following process：
The first dimension index and the second dimension index uniform sampling to presetting the pre-coding matrix that code book is included, obtain S
Individual first dimension index and S the second dimension index, wherein, S is that the maximum feedback bit number allowed according to system determines, S
It is the integer more than or equal to 1；
The S the first dimension index and the S the second dimension are indexed into the code book that corresponding pre-coding matrix is formed
It is defined as final code book, and again for the pre-coding matrix in the final code book distributes the first dimension index and the second dimension rope
Draw.
Wherein, in Fig. 10, bus architecture can include the bus and bridge of any number of interconnection, specifically by processor
The various circuits of the memory that 101 one or more processors for representing and memory 102 are represented are linked together.Bus architecture
Various other circuits of such as ancillary equipment, voltage-stablizer and management circuit or the like can also be linked together, these
All it is it is known in the art, therefore, being no longer described further to it herein.EBI provides interface.Processor 101
Bus architecture and common treatment are responsible for, memory 102 can store the number that processor 101 is used when operation is performed
According to.
Optionally, processor 101 reads the program in memory 102, specific to perform：
The first dimension index of the pre-coding matrix that the default code book is included is divided into M1 groups, by the default code book
Comprising pre-coding matrix the second dimension index be divided into M2 groups, obtain M1*M2 index piecemeal, wherein, M1 be more than or
Integer equal to 1, M2 is the integer more than or equal to 1；
For index piecemeal each described, according to the first sampling interval, first dimension index is sampled, obtained
L the first dimensions index, wherein, L=S/ (M1*M2), L are the integer more than or equal to 1, and K1 represents in the index piecemeal the
The number of dimension index；And according to the second sampling interval, second dimension index is sampled, obtain L second
Dimension is indexed, wherein, K2 represents the number of the second dimension index in the index piecemeal.
Optionally, processor 101 reads the program in memory 102, specific to perform：
According to the first sampling interval and the first index offset value δ 1 of setting, first dimension index is sampled,
L the first dimension index is obtained, wherein, δ 1 is integer and 0≤δ, 1≤K1；And/or
According to the second sampling interval and the second index offset value δ 2 of setting, second dimension index is sampled,
L the second dimension index is obtained, wherein, δ 2 is integer and 0≤δ, 2≤K2.
Wherein, the setting in first sampling interval and second sampling interval is referring specifically to the embodiment shown in Fig. 1
In associated description.
Optionally, processor 101 reads the program in memory 102, specific to perform：Determine the S the first dimension
It is right that index and individual second dimensions of the S index the S index to be formed；And by described S index to corresponding precoding square
Formation into set be defined as final code book.
Wherein, it is described S index to optional implementation retouched referring specifically to the correlation in the embodiment shown in Fig. 1
State.
Another dress for sending precoding configured information is provided based on same inventive concept, in the embodiment of the present invention 11
Put, as shown in figure 11, the device includes：Transceiver 111 and the transceiver 111 connection at least one processor 112 and
The memory 113 being connected with least one processor 112, wherein：
Processor 112, for reading the program in memory 113, performs following process：
According to channel measurement, pre-coding matrix is selected from code book, wherein, the code book is the implementation shown in Fig. 1
The code book generated in example, referring specifically to the associated description in the embodiment shown in Fig. 1；
Transceiver 111 is used under the control of processor 112, and the first dimension of the pre-coding matrix is sent to network side
Index and the second dimension index.
Wherein, in fig. 11, bus architecture can include the bus and bridge of any number of interconnection, specifically by processor
The various circuits of the memory that 112 one or more processors for representing and memory 113 are represented are linked together.Bus architecture
Various other circuits of such as ancillary equipment, voltage-stablizer and management circuit or the like can also be linked together, these
All it is it is known in the art, therefore, being no longer described further to it herein.EBI provides interface.Transceiver 111
Can be multiple element, i.e., including transmitter and receiver, there is provided for what is communicated with various other devices over a transmission medium
Unit.For different user equipmenies, user interface 114 can also be can it is external in connect the interface for needing equipment, connection
Equipment includes but is not limited to keypad, display, loudspeaker, microphone, control stick etc..
Processor 112 is responsible for bus architecture and common treatment, and memory 113 can store processor 112 and hold
The data used during row operation.
Another dress for sending precoding configured information is provided based on same inventive concept, in the embodiment of the present invention 12
Put, as shown in figure 12, the device includes：Transceiver 121 and the transceiver 121 connection at least one processor 122 and
The memory 123 being connected with least one processor 122, wherein：
Transceiver 121 is used under the control of processor 122, receives the first dimension index and second that user equipment sends
Dimension is indexed；
Processor 122, for reading the program in memory 123, performs following process：
According to first dimension index and second dimension index, corresponding precoding square is determined from code book
Battle array, wherein, the code book is the code book generated in the embodiment shown in Fig. 1, referring specifically to the correlation in the embodiment shown in Fig. 1
Description.
Wherein, in fig. 12, bus architecture can include the bus and bridge of any number of interconnection, specifically by processor
The various circuits of the memory that 122 one or more processors for representing and memory 123 are represented are linked together.Bus architecture
Various other circuits of such as ancillary equipment, voltage-stablizer and management circuit or the like can also be linked together, these
All it is it is known in the art, therefore, being no longer described further to it herein.EBI provides interface.Transceiver 121
Can be multiple element, i.e., including transmitter and receiver, there is provided for what is communicated with various other devices over a transmission medium
Unit.
Processor 122 is responsible for bus architecture and common treatment, and memory 123 can store processor 122 and hold
The data used during row operation.
It should be understood by those skilled in the art that, embodiments of the invention can be provided as method, system or computer program
Product.Therefore, the present invention can be using the reality in terms of complete hardware embodiment, complete software embodiment or combination software and hardware
Apply the form of example.And, the present invention can be used and wherein include the computer of computer usable program code at one or more
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) is produced
The form of product.
The present invention is the flow with reference to method according to embodiments of the present invention, equipment (system) and computer program product
Figure and/or block diagram are described.It should be understood that every first-class during flow chart and/or block diagram can be realized by computer program instructions
The combination of flow and/or square frame in journey and/or square frame and flow chart and/or block diagram.These computer programs can be provided
The processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing devices is instructed to produce
A raw machine so that produced for reality by the instruction of computer or the computing device of other programmable data processing devices
The device of the function of being specified in present one flow of flow chart or multiple one square frame of flow and/or block diagram or multiple square frames.
These computer program instructions may be alternatively stored in can guide computer or other programmable data processing devices with spy
In determining the computer-readable memory that mode works so that instruction of the storage in the computer-readable memory is produced and include finger
Make the manufacture of device, the command device realize in one flow of flow chart or multiple one square frame of flow and/or block diagram or
The function of being specified in multiple square frames.
These computer program instructions can be also loaded into computer or other programmable data processing devices so that in meter
Series of operation steps is performed on calculation machine or other programmable devices to produce computer implemented treatment, so as in computer or
The instruction performed on other programmable devices is provided for realizing in one flow of flow chart or multiple flows and/or block diagram one
The step of function of being specified in individual square frame or multiple square frames.
, but those skilled in the art once know basic creation although preferred embodiments of the present invention have been described
Property concept, then can make other change and modification to these embodiments.So, appended claims are intended to be construed to include excellent
Select embodiment and fall into having altered and changing for the scope of the invention.
Obviously, those skilled in the art can carry out various changes and modification without deviating from essence of the invention to the present invention
God and scope.So, if these modifications of the invention and modification belong to the scope of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to comprising these changes and modification.
Claims (18)
1. a kind of method for generating codebooks, it is characterised in that the method includes：
The first dimension index and the second dimension index uniform sampling to presetting the pre-coding matrix that includes of code book, obtain S the
Dimension is indexed and S the second dimension index, wherein, S is that the maximum feedback bit number allowed according to system determines that S is big
In or equal to 1 integer；
The code book that the S the first dimension index and the corresponding pre-coding matrix of the individual second dimension indexes of the S are formed is determined
It is final code book, and again for the pre-coding matrix in the final code book distributes the first dimension index and the second dimension index.
2. the method for claim 1, it is characterised in that the first dimension rope to presetting the pre-coding matrix that code book is included
Draw and index uniform sampling with the second dimension, obtain S the first dimension index and S the second dimension index, including：
The first dimension index of the pre-coding matrix that the default code book is included is divided into M1 groups, and the default code book is included
Pre-coding matrix the second dimension index be divided into M2 groups, obtain M1*M2 index piecemeal, wherein, M1 is more than or equal to 1
Integer, M2 is the integer more than or equal to 1；
For index piecemeal each described, according to the first sampling interval, first dimension index is sampled, obtain L
First dimension is indexed, wherein, L=S/ (M1*M2), L are the integer more than or equal to 1, and K1 is represented first in the index piecemeal
The number of dimension index；And according to the second sampling interval, second dimension index is sampled, obtain L second dimension
Degree index, wherein, K2 represents the number of the second dimension index in the index piecemeal.
3. method as claimed in claim 2, it is characterised in that for index piecemeal each described, according to the first sampling interval,
First dimension index is sampled, L the first dimension index is obtained, including：According to the first sampling interval and setting
First index offset value δ 1, samples to first dimension index, obtains L the first dimension index, wherein, δ 1 is integer
And 0≤δ, 1≤K1；And/or
For index piecemeal each described, according to the second sampling interval, second dimension index is sampled, obtain L
Second dimension is indexed, including：According to the second sampling interval and the second index offset value δ 2 of setting, second dimension is indexed
Sampled, obtained L the second dimension index, wherein, δ 2 is integer and 0≤δ, 2≤K2.
4. method as claimed in claim 2 or claim 3, it is characterised in that first sampling interval is determined using equation below：OrWherein, △ 1 is first sampling interval；
Second sampling interval is defined as using equation below：OrWherein,
△ 2 is first sampling interval.
5. the method for claim 1, it is characterised in that by the S the first dimension index and the S the second dimension
The code book for indexing corresponding pre-coding matrix formation is defined as final code book, including：
Determine that the S the first dimension index and individual second dimensions of the S index the S index to be formed right；
Described S index is defined as final code book to the set that corresponding pre-coding matrix is formed.
6. method as claimed in claim 5, it is characterised in that the S the first dimension index of S index centering and
The S the first dimension index is arranged according to the ordering rule of setting.
7. method as claimed in claim 6, it is characterised in that the ordering rule includes：
The S the first dimension is indexed by order arrangement from big to small, and the S the second dimension index is pressed from big to small
Order is arranged；Or
The S the first dimension is indexed by order arrangement from big to small, and the S the second dimension index is pressed from small to large
Order is arranged；Or
The S the first dimension is indexed by order arrangement from small to large, and the S the second dimension index is pressed from big to small
Order is arranged；Or
The S the first dimension is indexed by order arrangement from small to large, and the S the second dimension index is pressed from small to large
Order is arranged.
8. it is a kind of send precoding configured information method, it is characterised in that the method includes：
According to channel measurement, pre-coding matrix is selected from code book, wherein, the code book is as claim 1~7 is any
The code book of the method generation described in；
The the first dimension index and the second dimension for sending the pre-coding matrix to network side are indexed.
9. it is a kind of receive precoding configured information method, it is characterised in that the method includes：
Receive the first dimension index and the second dimension index that user equipment sends；
According to first dimension index and second dimension index, corresponding pre-coding matrix is determined from code book, its
In, the code book is the code book of the method generation as described in any one of claim 1~7.
10. a kind of code book generating means, it is characterised in that the device includes：
Indexed samples module, for equal to presetting the first dimension index and the second dimension index of the pre-coding matrix that code book is included
Even sampling, obtains S the first dimension index and S the second dimension index, wherein, S is the maximum feedback ratio allowed according to system
What special number determined, S is the integer more than or equal to 1；
Code book generation module, for the S the first dimension index and the S the second dimension to be indexed into corresponding precoding square
Formation into code book be defined as final code book, and again for the pre-coding matrix in the final code book distributes the first dimension index
Indexed with the second dimension.
11. devices as claimed in claim 10, it is characterised in that the indexed samples module specifically for：
The first dimension index of the pre-coding matrix that the default code book is included is divided into M1 groups, and the default code book is included
Pre-coding matrix the second dimension index be divided into M2 groups, obtain M1*M2 index piecemeal, wherein, M1 is more than or equal to 1
Integer, M2 is the integer more than or equal to 1；
For index piecemeal each described, according to the first sampling interval, first dimension index is sampled, obtain L
First dimension is indexed, wherein, L=S/ (M1*M2), L are the integer more than or equal to 1, and K1 is represented first in the index piecemeal
The number of dimension index；And according to the second sampling interval, second dimension index is sampled, obtain L second dimension
Degree index, wherein, K2 represents the number of the second dimension index in the index piecemeal.
12. devices as claimed in claim 11, it is characterised in that the indexed samples module specifically for：
According to the first sampling interval and the first index offset value δ 1 of setting, first dimension index is sampled, obtain L
Individual first dimension index, wherein, δ 1 is integer and 0≤δ, 1≤K1；And/or
According to the second sampling interval and the second index offset value δ 2 of setting, second dimension index is sampled, obtain L
Individual second dimension index, wherein, δ 2 is integer and 0≤δ, 2≤K2.
13. device as described in claim 11 or 12, it is characterised in that first sampling interval is true using equation below
It is fixed：OrWherein, △ 1 is first sampling interval；
Second sampling interval is defined as using equation below：OrWherein,
△ 2 is first sampling interval.
14. devices as claimed in claim 10, it is characterised in that the code book generation module specifically for：
Determine that the S the first dimension index and individual second dimensions of the S index the S index to be formed right；And by the S
Individual index is defined as final code book to the set that corresponding pre-coding matrix is formed.
15. devices as claimed in claim 14, it is characterised in that the S the first dimension index of S index centering
Arranged according to the ordering rule of setting with the S the first dimension index.
16. devices as claimed in claim 15, it is characterised in that the ordering rule includes：
The S the first dimension is indexed by order arrangement from big to small, and the S the second dimension index is pressed from big to small
Order is arranged；Or
The S the first dimension is indexed by order arrangement from big to small, and the S the second dimension index is pressed from small to large
Order is arranged；Or
The S the first dimension is indexed by order arrangement from small to large, and the S the second dimension index is pressed from big to small
Order is arranged；Or
The S the first dimension is indexed by order arrangement from small to large, and the S the second dimension index is pressed from small to large
Order is arranged.
17. a kind of devices for sending precoding configured information, it is characterised in that the device includes：
Selecting module, for according to channel measurement, pre-coding matrix being selected from code book, wherein, the code book is such as power
Profit requires the code book of the method generation described in 1~7 any one；
Sending module, the first dimension index from the pre-coding matrix to network side and the second dimension for sending are indexed.
18. a kind of devices for receiving precoding configured information, it is characterised in that the device includes：
Receiver module, the first dimension index and the second dimension index for receiving user equipment transmission；
Determining module, for according to first dimension index and second dimension index, being determined from code book corresponding
Pre-coding matrix, wherein, the code book is the code book of the method generation as described in any one of claim 1~7.
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| CN110149717B (en) * | 2018-02-14 | 2020-09-25 | 华为技术有限公司 | Codebook transmission method, device and system |
| US11381283B2 (en) | 2018-02-14 | 2022-07-05 | Huawei Technologies Co., Ltd. | Codebook transmission method, apparatus, and system |
| WO2019192009A1 (en) * | 2018-04-05 | 2019-10-10 | Qualcomm Incorporated | Overhead reduction for channel state information |
| WO2019192527A1 (en) * | 2018-04-05 | 2019-10-10 | Qualcomm Incorporated | Overhead reduction for channel state information |
| US11632160B2 (en) | 2018-04-05 | 2023-04-18 | Qualcomm Incorporated | Overhead reduction for channel state information |
| WO2022042323A1 (en) * | 2020-08-27 | 2022-03-03 | 中兴通讯股份有限公司 | Precoding matrix indicator determination method, terminal device, and storage medium |
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