CN111294145A - CSI feedback parameter reporting method and device, storage medium and terminal - Google Patents

CSI feedback parameter reporting method and device, storage medium and terminal Download PDF

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CN111294145A
CN111294145A CN201910248504.8A CN201910248504A CN111294145A CN 111294145 A CN111294145 A CN 111294145A CN 201910248504 A CN201910248504 A CN 201910248504A CN 111294145 A CN111294145 A CN 111294145A
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feedback
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CN111294145B (en
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马大为
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Beijing Spreadtrum Hi Tech Communications Technology Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0027—Scheduling of signalling, e.g. occurrence thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0028—Formatting
    • H04L1/0029—Reduction of the amount of signalling, e.g. retention of useful signalling or differential signalling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
    • H04L1/0618—Space-time coding
    • H04L1/0675—Space-time coding characterised by the signaling
    • H04L1/0693—Partial feedback, e.g. partial channel state information [CSI]

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Abstract

A method and a device for reporting CSI feedback parameters, a storage medium and a terminal are provided, wherein the feedback parameters comprise a Type II codebook in CSI, and the reporting method comprises the following steps: if at least one part of the feedback parameters needs to be discarded, setting the priority of the feedback parameters, and setting the priority of each element in a first element set and a second element set in the feedback parameters as the lowest priority; discarding each element of the lowest priority in the feedback parameters; the first element set comprises at least part of elements of a non-zero differential amplitude sequence in the Type II codebook, the second element set comprises at least part of elements of a phase sequence in the Type II codebook, and each element in the first element set is in one-to-one correspondence with each element in the second element set. By the technical scheme provided by the invention, a feasible scheme can be provided for discarding the CSI feedback parameters.

Description

CSI feedback parameter reporting method and device, storage medium and terminal
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for reporting a CSI feedback parameter, a storage medium, and a terminal.
Background
In the 3rd Generation Partnership Project (3 GPP) New Radio (NR) Release 15(Release 15, R15) protocol, a Channel State Information (CSI) report may be divided into a first part and a second part. In the CSI report feedback process, when the feedback channel cannot carry complete channel state information, some feedback parameters of the second part need to be discarded.
In the NR R15 protocol, the feedback parameters in the second part of the CSI report may be categorized into wideband feedback parameters and subband feedback parameters. However, the CSI feedback parameters in NR version 16(Release 16, abbreviated as R16) cannot be classified into wideband feedback parameters and subband feedback parameters.
Therefore, the CSI feedback parameters in NR R16 cannot move the CSI feedback parameter dropping rule in NR R15. In NRR16, how to discard part of the feedback parameters requires further investigation.
Disclosure of Invention
The technical problem solved by the invention is how to discard part of feedback parameters in CSI so as to reduce the number of reported bits.
In order to solve the foregoing technical problem, an embodiment of the present invention provides a method for reporting a CSI feedback parameter, where the feedback parameter includes a Type II codebook in CSI, and the method includes: if at least one part of the feedback parameters needs to be discarded, setting the priority of the feedback parameters, and setting the priority of each element in a first element set and a second element set in the feedback parameters as the lowest priority; discarding each element of the lowest priority in the feedback parameters; the first element set comprises at least part of elements of a non-zero differential amplitude sequence in the Type II codebook, the second element set comprises at least part of elements of a phase sequence in the Type II codebook, and each element in the first element set is in one-to-one correspondence with each element in the second element set.
Optionally, before setting the priority of the feedback parameter, the reporting method further includes: determining whether to discard at least a portion of the feedback parameters.
Optionally, the setting the priority of the feedback parameter includes: grouping all feedback parameters in the Type II codebook, and setting priorities to obtain a plurality of feedback parameter groups with different priorities; wherein the priority of the feedback parameter set including each element in the first and second element sets is at the lowest priority.
Optionally, the multiple feedback parameter groups include a first feedback parameter group and a second feedback parameter group, and the grouping all the feedback parameters in the Type II codebook and setting the priority includes: for all feedback parameters in the Type II codebook, dividing other feedback parameters except a reference coefficient amplitude value, a non-zero difference amplitude sequence and a phase sequence into the first feedback parameter group; forming the first set of elements based on respective elements within the non-zero differential amplitude sequence and the second set of elements based on respective elements within the phase sequence; dividing the first set of elements, the second set of elements, and a reference coefficient amplitude value into the second set of feedback parameters, each element in the non-zero differential amplitude sequence corresponding to each element in the phase sequence one-to-one; setting a priority of the first feedback parameter group higher than a priority of the second feedback parameter group.
Optionally, the discarding each element of the lowest priority in the feedback parameters includes: discarding all feedback parameters in the second set of feedback parameters.
Optionally, the multiple feedback parameter groups include a first feedback parameter group, a second feedback parameter group, and a third feedback parameter group, and grouping all feedback parameters in the Type II codebook, and setting the priority includes: for all feedback parameters in the Type II codebook, dividing other feedback parameters except a reference coefficient amplitude value, a non-zero difference amplitude sequence and a phase sequence into the first feedback parameter group; dividing a reference coefficient amplitude value, each element located at a first position in the non-zero differential amplitude sequence, and each element located at the first position in the phase sequence into the second feedback parameter group, wherein each element in the non-zero differential amplitude sequence and each element in the phase sequence are in one-to-one correspondence; taking each element in the non-zero differential amplitude sequence at a second position as an element in the first element set, and taking each element in the phase sequence at the second position as an element in the second element set; dividing the first element set and the second element set into the third feedback parameter group; setting priorities of the first feedback parameter group, the second feedback parameter group and the third feedback parameter group to be sequentially reduced; wherein the first position is one of an odd position and an even position, and the second position is the other of the odd position and the even position.
Optionally, the discarding each element of the lowest priority in the feedback parameters includes: preferentially discarding all feedback parameters in the third set of feedback parameters.
Optionally, the multiple feedback parameter groups include a first feedback parameter group, a second feedback parameter group, and a third feedback parameter group, and grouping all feedback parameters in the Type II codebook, and setting the priority includes: for all feedback parameters in the Type II codebook, dividing other feedback parameters except a reference coefficient amplitude value, a non-zero difference amplitude sequence and a phase sequence into the first feedback parameter group; taking M non-zero differential amplitude elements with the minimum amplitude in the non-zero differential amplitude sequence as elements of the first element set, and taking M phase elements corresponding to the M non-zero differential amplitude elements as elements of the second element set, where the M phase elements are located in the phase sequence, and M is a positive integer; dividing the first element set and the second element set into the second feedback parameter set, wherein each element in the non-zero differential amplitude sequence corresponds to each element in the phase sequence one to one; dividing a reference coefficient amplitude value, the remaining non-zero difference amplitude elements in the non-zero difference amplitude sequence except the M non-zero difference amplitude elements, and the remaining phase elements in the phase sequence except the M phase elements into the third feedback parameter group; setting priorities of the first feedback parameter group, the third feedback parameter group, and the second feedback parameter group to be sequentially lower.
Optionally, the non-zero coefficient index is an index of each element in the non-zero differential amplitude sequence, and discarding each element with the lowest priority in the feedback parameters includes the following steps: step A, discarding all feedback parameters in the second feedback parameter group; step B, judging whether to continuously discard at least one part of parameters in the third feedback parameter group; step C, if the discarding is stopped, updating the non-zero coefficient index and ending, otherwise, continuously discarding at least one part of the parameters in the third feedback parameter group, where the continuously discarding at least one part of the parameters in the third feedback parameter group includes: for all feedback parameters in the third feedback parameter group, selecting M non-zero differential amplitude elements with the minimum amplitude from the other non-zero differential amplitude elements, dividing the selected M non-zero differential amplitude elements and M phase elements corresponding to the M non-zero differential amplitude elements into the second feedback parameter group, updating the third feedback parameter group so that the updated third feedback parameter group includes the other feedback parameters except all the feedback parameters in the second feedback parameter group, deleting all the feedback parameters in the second feedback parameter group, and turning to step B.
Optionally, M is a preset value, or a preconfigured value.
Optionally, when there are a plurality of layers, the number of the non-zero differential amplitude sequences is multiple, and the number of the phase sequences is multiple, where each non-zero differential amplitude sequence is composed of the non-zero differential amplitude of each layer, and each phase sequence is composed of the phase of each layer.
Optionally, when there are a plurality of layers, the number of the non-zero differential amplitude sequences is 1, the number of the phase sequences is 1, the non-zero differential amplitude sequence is composed of non-zero differential amplitudes of all the layers, and the phase sequence is composed of phases of all the layers.
Optionally, the other feedback parameters include a spatial-domain beam index set, a frequency-domain beam index set, a strongest coefficient index, and a non-zero coefficient index.
Optionally, the reporting method further includes: and transmitting the CSI.
In order to solve the foregoing technical problem, an embodiment of the present invention further provides a device for reporting CSI feedback parameters, where the feedback parameters include a Type II codebook in CSI, and the device for reporting includes: a setting module, adapted to set a priority of the feedback parameter if at least a portion of the feedback parameter needs to be discarded, and set the priority of each element in the first element set and the second element set in the feedback parameter to a lowest priority; a discarding module adapted to discard elements of lowest priority in the feedback parameters; the first element set comprises at least part of elements of a non-zero differential amplitude sequence in the Type II codebook, the second element set comprises at least part of elements of a phase sequence in the Type II codebook, and each element in the first element set is in one-to-one correspondence with each element in the second element set.
To solve the above technical problem, an embodiment of the present invention further provides a storage medium having stored thereon computer instructions, where the computer instructions execute the steps of the above method when executed.
In order to solve the foregoing technical problem, an embodiment of the present invention further provides a terminal, including a memory and a processor, where the memory stores computer instructions executable on the processor, and the processor executes the computer instructions to perform the steps of the foregoing method.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:
the embodiment of the invention provides a method for reporting a CSI feedback parameter, wherein the feedback parameter comprises a Type II codebook in CSI, and the reporting method comprises the following steps: if at least one part of the feedback parameters needs to be discarded, setting the priority of the feedback parameters, and setting the priority of each element in a first element set and a second element set in the feedback parameters as the lowest priority; discarding each element of the lowest priority in the feedback parameters; the first element set comprises at least part of elements of a non-zero differential amplitude sequence in the Type II codebook, the second element set comprises at least part of elements of a phase sequence in the Type II codebook, and each element in the first element set is in one-to-one correspondence with each element in the second element set. For this reason, in the embodiment of the present invention, priority ranking is performed on each feedback parameter in a Type II codebook, and priorities of at least part of elements of a non-zero differential amplitude sequence and at least part of elements of a phase sequence therein are set to be lowest priorities, and when a feedback channel cannot carry complete channel state information, the feedback parameter with the lowest priority is discarded. By the technical scheme provided by the embodiment of the invention, part of feedback parameters can be discarded from low to high according to the priority, and the CSI reporting bit number is reduced.
Further, the plurality of feedback parameter groups include a first feedback parameter group and a second feedback parameter group, and the grouping all the feedback parameters in the Type II codebook and setting the priority includes: for all feedback parameters in the Type II codebook, dividing other feedback parameters except a reference coefficient amplitude value, a non-zero difference amplitude sequence and a phase sequence into the first feedback parameter group; forming the first set of elements based on respective elements within the non-zero differential amplitude sequence and the second set of elements based on respective elements within the phase sequence; dividing the first set of elements, the second set of elements, and a reference coefficient amplitude value into the second set of feedback parameters, each element in the non-zero differential amplitude sequence corresponding to each element in the phase sequence one-to-one; setting a priority of the first feedback parameter group higher than a priority of the second feedback parameter group. In the embodiment of the present invention, the priority of the feedback parameters other than the reference coefficient amplitude value, the non-zero difference amplitude sequence and the phase sequence is set as a high priority, and the non-zero difference amplitude sequence and the phase sequence corresponding to the non-zero difference amplitude sequence in a one-to-one manner are used as a second feedback parameter group, and the priority is set as a low priority. The embodiment of the invention defines the feedback parameters to be discarded as each feedback parameter in the second feedback parameter group, and further provides a feasible scheme for discarding the feedback reference.
Further, the plurality of feedback parameter groups include a first feedback parameter group, a second feedback parameter group, and a third feedback parameter group, and grouping all the feedback parameters in the Type II codebook, and setting the priority includes: for all feedback parameters in the Type II codebook, dividing other feedback parameters except a reference coefficient amplitude value, a non-zero difference amplitude sequence and a phase sequence into the first feedback parameter group; dividing a reference coefficient amplitude value, each element located at a first position in the non-zero differential amplitude sequence, and each element located at the first position in the phase sequence into the second feedback parameter group, wherein each element in the non-zero differential amplitude sequence and each element in the phase sequence are in one-to-one correspondence; taking each element in the non-zero differential amplitude sequence at a second position as an element in the first element set, and taking each element in the phase sequence at the second position as an element in the second element set; dividing the first element set and the second element set into the third feedback parameter group; setting priorities of the first feedback parameter group, the second feedback parameter group and the third feedback parameter group to be sequentially reduced; wherein the first position is one of an odd position and an even position, and the second position is the other of the odd position and the even position. The embodiment of the present invention divides the feedback parameters in the Type II codebook into three groups, and sets the priority of some elements (for example, the feedback parameters located at the first position or the second position) in the non-zero differential amplitude sequence and the phase sequence to be the lowest priority, and the priority of the rest elements is between the highest priority and the lowest priority. When the feedback channel cannot bear complete channel state information, the technical scheme provided by the embodiment of the invention can have more discarding options, can discard part of feedback parameters, reduce the CSI feedback bit number, and can report more channel state information to the base station as much as possible.
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Fig. 1 is a schematic flow chart of a method for reporting CSI feedback parameters according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an apparatus for reporting CSI feedback parameters according to an embodiment of the present invention.
Detailed Description
As background, NR R16 cannot take care of CSI feedback parameter dropping rules in NR R15.
Specifically, in the 3GPP NR 15 protocol, if a CSI report contains subband-level channel state information, the CSI report may be divided into two pieces of information, a first piece and a second piece. The same feedback channel may contain multiple CSI reports, and preferentially feeds back a first part of the multiple CSI reports. In the channel state information feedback process, when the feedback channel cannot carry complete channel state information, some feedback parameters of the second part need to be discarded.
The 3GPP R15 NR protocol divides the second part of the CSI report into three groups: wideband CSI (set 1), even subband CSI (set 2), and odd subband CSI (set 3). The wideband CSI for all CSI reports (set 1) is at the highest priority. The CSI reports are sorted according to priority, and the even-numbered sub-band CSI (group 2) of the same CSI report has priority higher than that of the odd-numbered sub-band CSI (group 3). Then, the feedback parameters may be discarded in the order of priority from low to high until the feedback channel can carry the remaining CSI information.
When a Type II (Type II) codebook is included in the CSI report, the Type II codebook feedback parameters are all located in the second part of the CSI report. The wideband CSI comprises a space-domain beam index group, a strongest space-domain beam index and a wideband amplitude sequence, the even-numbered subband CSI comprises an even-numbered subband differential amplitude sequence and an even-numbered subband phase sequence, and the odd-numbered subband CSI comprises an odd-numbered subband differential amplitude sequence and an odd-numbered subband phase sequence.
Taking the subband codebook in the Type II codebook as an example, each subband codebook is generally formed by linear superposition of spatial beam vectors:
Figure BDA0002011713040000071
wherein, W(i)A codebook matrix representing a subband i, i being a positive integer, WspaceA spatial beam matrix, W, representing the formation of a spatial beam vectorspaceDimension of (A) is NTX×2L，NTXRepresenting transmit antenna portsThe number, L, is the number of spatial beams in each polarization direction. When a dual polarized antenna is used, there are 2L spatial beams. WspaceEach column of (1) represents a length of NTXThe spatial beam vector of (1).
Figure BDA0002011713040000074
A matrix of weighting coefficients representing spatial beams.
Figure BDA0002011713040000072
Is of a dimension of 2L x 1,
Figure BDA0002011713040000073
each element in (a) represents a spatial beam weighting coefficient.
Since all subbands use the same set of spatial beams, N is combinedSB(NSBPositive integer) subband codebook, the matrix WspaceStill remains unchanged, but W(i)And
Figure BDA0002011713040000075
increased dimension NSBThe feedback parameters within the Type II codebook will be increased.
Due to the number of transmit antenna ports (N)TX) Very large, feeding back the precoding vectors of all subbands directly would require a large number of bits. Therefore, in the prior art, the number of bits is usually reduced by feeding back spatial beam indexes and their complex weighting coefficients.
The specific feedback parameters may be divided into wideband-level parameters and sub-band-level parameters. The broadband level parameters comprise an airspace wave beam index group, a strongest airspace wave beam index and a broadband amplitude sequence; the sub-band level parameters comprise a sub-band differential amplitude sequence and a sub-band phase sequence.
The 3GPP has determined that the NR R15 Type II codebook is enhanced at the NR R16 stage. Compared with the NR R15 Type II codebook structure, the NR R16 Type II codebook compresses the dimension of the antenna port, compresses the dimension of the subband and reduces the feedback overhead.
At this time, the NR R16 Type II codebook includes: a matrix W of all subband codebooks of dimensionNTX×NSB. Wherein N isTXIndicating the number of transmit antenna ports, NSBRepresenting the number of subbands. The codebook matrix W is compressed by space-domain beams in the dimension of an antenna port and frequency-domain beams in the dimension of a sub-band to obtain W ═ Wspace×W’×Wfreq. Wherein, WspaceDimension of (A) is NTXX 2L, L denotes the number of spatial beams in each polarization direction, and a dual polarized antenna is used, so that there are 2L spatial beams in total. WspaceEach column of (a) represents a length of NTXThe spatial beam vector of (1). W 'represents a weighting coefficient matrix having a dimension of 2L × K, each value in W' representing a weighting coefficient; wfreqRepresenting a frequency domain compression matrix having dimensions K NSB，WfreqEach row of (a) represents a length of NSBThe frequency domain beam vector of (1).
Similar to the Type II codebook feedback in R15, the Type II codebook in R16 reduces the number of bits by feeding back the spatial beam index, the frequency domain beam index, and their complex weighting coefficients. The specific feedback parameters can be divided into global parameters and beam level parameters. The global parameters may include a spatial domain beam index set, a frequency domain beam index set, a strongest coefficient index, a non-zero coefficient index, etc., and the beam level parameters may include a reference coefficient amplitude value, a non-zero differential amplitude sequence, a phase sequence.
Since the NR R15 Type II codebook feedback parameters are different from the R16 Type II codebook feedback parameters, the feedback parameter grouping rule of NR R15 is not applicable to the NR R16 codebook.
In order to solve the foregoing technical problem, an embodiment of the present invention provides a method for reporting a CSI feedback parameter, where the feedback parameter includes a Type II codebook in CSI, and the method includes: if at least one part of the feedback parameters needs to be discarded, setting the priority of the feedback parameters, and setting the priority of each element in a first element set and a second element set in the feedback parameters as the lowest priority; discarding each element of the lowest priority in the feedback parameters; the first element set comprises at least part of elements of a non-zero differential amplitude sequence in the Type II codebook, the second element set comprises at least part of elements of a phase sequence in the Type II codebook, and each element in the first element set is in one-to-one correspondence with each element in the second element set.
For this reason, in the embodiment of the present invention, priority ranking is performed on each feedback parameter in a Type II codebook, and priorities of at least part of elements of a non-zero differential amplitude sequence and at least part of elements of a phase sequence therein are set to be lowest priorities, and when a feedback channel cannot carry complete channel state information, the feedback parameter with the lowest priority is discarded. By the technical scheme provided by the embodiment of the invention, part of feedback parameters can be discarded from low to high according to the priority, and the CSI reporting bit number is reduced.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Fig. 1 is a flowchart illustrating a method for reporting CSI feedback parameters according to an embodiment of the present invention. The reporting method may be applied to a User Equipment (UE), for example, executed by 3GPP NR 16 and subsequent versions of UE.
Specifically, the CSI feedback parameter may be included in a Type II codebook in CSI, and the reporting method may include the following steps:
step S101, if at least one part of the feedback parameters needs to be discarded, setting the priority of the feedback parameters, and setting the priority of each element in a first element set and a second element set in the feedback parameters as the lowest priority;
and step S102, discarding each element with the lowest priority in the feedback parameters.
The first element set comprises at least part of elements of a non-zero differential amplitude sequence in the Type II codebook, the second element set comprises at least part of elements of a phase sequence in the Type II codebook, and each element in the first element set is in one-to-one correspondence with each element in the second element set.
More specifically, in the CSI feedback process, for Type II codebook feedback, when the UE is ready to report channel state information, the UE first determines a CSI feedback parameter and a feedback resource for transmitting CSI, and divides the CSI feedback parameter into a first part and a second part. After prioritizing feedback of the first portion of the plurality of CSI reports, the UE may determine whether the feedback parameters of the second portion need to be discarded. The UE needs to discard at least a part of the feedback parameters if the feedback resources cannot transmit all feedback parameters within the second part.
The UE may set a priority for the feedback parameters before dropping the feedback parameters. The priority of each element in the first element set and the second element set in the feedback parameters is set as the lowest priority, and then in step S102, each element with the lowest priority in the feedback parameters (i.e., each feedback parameter with the lowest priority) is discarded.
In a specific implementation, the UE may set priorities for all feedback parameters in the Type II codebook, and divide the feedback parameters belonging to the same priority into the same group, so as to obtain a plurality of feedback parameter sets with different priorities. In particular implementation, the UE may set a priority of a feedback parameter set including each element in the first element set and the second element set to a lowest priority.
In one embodiment, the UE may divide all feedback parameters within the Type II codebook into two groups, namely a first feedback parameter group and a second feedback parameter group. In a specific implementation, the UE may divide other feedback parameters except for the reference coefficient amplitude value, the non-zero differential amplitude sequence, and the phase sequence into the first feedback parameter group, and set a priority of the first feedback parameter group to be a high priority. The other feedback parameters may include a spatial-domain beam index set, a frequency-domain beam index set, a strongest coefficient index, and a non-zero coefficient index.
Thereafter, the UE may divide the non-zero differential amplitude sequence, the phase sequence, and the reference coefficient amplitude value into the second feedback parameter group. The UE may set a priority for setting the second feedback parameter group to a low priority. At this point, each element within the non-zero differential amplitude sequence forms the first set of elements and each element within the non-zero differential amplitude sequence forms the second set of elements. Those skilled in the art understand that each element in the non-zero differential amplitude sequence and each element in the phase sequence have a one-to-one correspondence.
Further, the UE may discard all feedback parameters in the second set of feedback parameters, i.e., the UE may discard the reference coefficient amplitude value, each element in the non-zero differential amplitude sequence, and each element in the phase sequence.
In another embodiment, the UE may group all feedback parameters in the Type II codebook into three groups, which are a first feedback parameter group, a second feedback parameter group, and a third feedback parameter group.
In a specific implementation, the UE may divide other feedback parameters than the reference coefficient amplitude value, the non-zero differential amplitude sequence, and the phase sequence into the first feedback parameter group. And setting the priority of the first feedback parameter group to be the highest priority.
Thereafter, the UE may divide the reference coefficient amplitude value, each element located at an odd position in the non-zero differential amplitude sequence, and each element located at an odd position in the phase sequence into the second feedback parameter group.
Further, the UE may divide each element located at an even position in the non-zero differential amplitude sequence and each element located at an even position in the phase sequence into the third feedback parameter group. Wherein, each element in the non-zero differential amplitude sequence at an even position is an element in the first element set, and each element in the phase sequence at an even position is an element in the second element set.
Further, the UE may set the priority of the third feedback parameter group to be a lowest priority, and the priority of the second feedback parameter group is between the highest priority and the lowest priority.
Further, the UE may preferentially discard all feedback parameters in the third set of feedback parameters. Then, the UE may further determine whether the feedback parameters in the second feedback parameter group need to be discarded, and if so, discard the feedback parameters in the second feedback parameter group.
In this embodiment, when there are a plurality of layers, the non-zero differential amplitude sequence may be a plurality of layers, and the phase sequence may be a plurality of layers. Wherein each non-zero differential amplitude sequence may be formed of a non-zero differential amplitude of each layer (layer), and the phase sequence may be formed of a phase of each layer.
Or, when there are a plurality of layers, both the non-zero differential amplitude sequence and the phase sequence are 1. The non-zero differential amplitude sequence may be formed of the non-zero differential amplitudes of all layers, and the phase sequence may be formed of the phases of all layers. The number of layers is determined according to the channel condition, and the maximum number of layers corresponds to the number of data streams which can be simultaneously transmitted when the channel capacity is maximum.
In yet another embodiment, the UE may group all feedback parameters within the Type II codebook into three groups, which are a first feedback parameter group, a second feedback parameter group, and a third feedback parameter group, respectively.
In a specific implementation, the UE may divide other feedback parameters than the reference coefficient amplitude value, the non-zero differential amplitude sequence, and the phase sequence into the first feedback parameter group. And setting the priority of the first feedback parameter group to be the highest priority. The other feedback parameters may include a spatial-domain beam index set, a frequency-domain beam index set, a strongest coefficient index, and a non-zero coefficient index.
Thereafter, the UE may divide the reference coefficient amplitude value, each element located at an even position in the non-zero differential amplitude sequence, and each element located at an even position in the phase sequence into the second feedback parameter group.
Further, the UE may divide each element located at an odd position in the non-zero differential amplitude sequence and each element located at an odd position in the phase sequence into the third feedback parameter group. Wherein, each element in the non-zero differential amplitude sequence at an odd position is an element in the first element set, and each element in the phase sequence at an odd position is an element in the second element set.
Further, the UE may set the priority of the third feedback parameter group to be a lowest priority, and the priority of the second feedback parameter group is between the highest priority and the lowest priority.
Further, the UE may preferentially discard all feedback parameters in the third set of feedback parameters. Then, the UE may further determine whether the feedback parameters in the second feedback parameter group need to be discarded, and if so, discard the feedback parameters in the second feedback parameter group.
In this embodiment, when there are a plurality of layers, the non-zero differential amplitude sequence may be formed by the non-zero differential amplitude of each layer, and the phase sequence may be formed by the phase of each layer. Or, when there are a plurality of layers, there are 1 each of the non-zero differential amplitude sequence and the phase sequence. The non-zero differential amplitude sequence may be of non-zero differential amplitudes of all layers and the phase sequence may be of phases of all layers. The number of layers is determined according to the channel condition, and the maximum number of layers corresponds to the number of data streams which can be simultaneously transmitted when the channel capacity is maximum. .
In yet another embodiment, the UE may group all feedback parameters within the Type II codebook into three groups, which are a first feedback parameter group, a second feedback parameter group, and a third feedback parameter group.
In a specific implementation, the UE may divide other feedback parameters than the reference coefficient amplitude value, the non-zero differential amplitude sequence, and the phase sequence into the first feedback parameter group. And setting the priority of the first feedback parameter group to be the highest priority. The other feedback parameters may include a spatial-domain beam index set, a frequency-domain beam index set, a strongest coefficient index, and a non-zero coefficient index.
Further, the UE may use M non-zero differential amplitude elements with the minimum amplitude in the non-zero differential amplitude sequence as elements of the first element set, use M phase elements corresponding to the M non-zero differential amplitude elements as elements of the second element set, and divide the first element set and the second element set into the second feedback parameter set, where M is a positive integer. The UE may set the priority of the second set of feedback parameters to the lowest priority.
It should be noted that M may be a preset fixed value, or may be obtained by calculation or pre-configuration. And each element in the non-zero differential amplitude sequence corresponds to each element in the phase sequence one to one.
Further, the UE may divide the reference coefficient amplitude value, the remaining non-zero differential amplitude elements in the non-zero differential amplitude sequence except the M non-zero differential amplitude elements, and the remaining phase elements in the phase sequence except the M phase elements into the third feedback parameter group, and set a priority of the third feedback parameter group between a highest priority and a lowest priority.
Thereafter, the UE may discard all feedback parameters in the second set of feedback parameters. If the UE determines that at least a portion of the parameters in the third feedback parameter group still need to be discarded, the UE may continue to discard at least a portion of the parameters in the third feedback parameter group.
In a specific implementation, the continuously discarding at least a part of the parameters in the third feedback parameter group may include the following steps: first, for all feedback parameters in the third feedback parameter group, the UE may select M non-zero difference amplitude elements with the smallest amplitude from the remaining non-zero difference amplitude elements, and divide the selected M non-zero difference amplitude elements and their corresponding M phase elements into the second feedback parameter group.
Secondly, the UE may update the third feedback parameter group such that the updated third feedback parameter group includes the remaining feedback parameters except all the feedback parameters in the second feedback parameter group.
Thereafter, the UE may delete all feedback parameters in the second feedback parameter group, and repeat the above process until the feedback channel can transmit the remaining feedback parameters. And if the feedback parameters are stopped to be continuously discarded, the UE updates the nonzero coefficient index and indicates the index corresponding to the deleted nonzero coefficient as a zero coefficient.
In this embodiment, the number of the non-zero differential amplitude sequences may be multiple, and the number of the phase sequences is multiple. Each non-zero differential amplitude sequence may be composed of the non-zero differential amplitudes of each layer, and each phase sequence may be composed of the phases of each layer. The non-zero differential amplitude sequence and the phase sequence are obtained for the same layer.
Or, when there are a plurality of layers, the number of the non-zero differential amplitude sequences is 1, and the number of the phase sequences is 1. At this time, the non-zero differential amplitude sequence may be composed of non-zero differential amplitudes of all layers, and the phase sequence may be composed of phases of all layers.
After the UE finishes discarding part of the feedback parameters, the UE may send the remaining CSI feedback parameters based on the feedback channel.
Thus, by the technical scheme provided by the embodiment of the invention, the feedback parameter groups can be fed back to the 3GPP NR R16 and the TypeII codebook of the subsequent edition, and when the feedback channel can not bear complete channel state information, partial feedback parameters are discarded according to the sequence from low priority to high priority of each group, so that the CSI feedback bit number is reduced.
Fig. 2 is a schematic structural diagram of an apparatus for reporting CSI feedback parameters according to an embodiment of the present invention. The feedback parameter is contained in a Type II codebook in CSI, and the reporting apparatus 2 for CSI feedback parameter (hereinafter, referred to as reporting apparatus 2) may be applied to a user equipment side, and those skilled in the art understand that the embodiment of the present invention may be used to implement the technical solution of the method shown in fig. 1.
Specifically, the reporting apparatus 2 may include: a setting module 21, wherein if at least a part of the feedback parameters needs to be discarded, the setting module 21 is adapted to set priorities of the feedback parameters, and set priorities of each element in the first element set and the second element set in the feedback parameters to be lowest priorities; a discarding module 22 adapted to discard elements of lowest priority in the feedback parameters; the first element set comprises at least part of elements of a non-zero differential amplitude sequence in the Type II codebook, the second element set comprises at least part of elements of a phase sequence in the Type II codebook, and each element in the first element set is in one-to-one correspondence with each element in the second element set.
In a specific implementation, the reporting device 2 may further include: a determining module 23 adapted to determine whether to discard at least a part of the feedback parameters before setting the priority of the feedback parameters.
In a specific implementation, the setting module 21 may include: the grouping submodule 211 is adapted to group all feedback parameters in the Type II codebook and set priorities to obtain a plurality of feedback parameter sets with different priorities; wherein the priority of the feedback parameter set including each element in the first and second element sets is at the lowest priority.
In one embodiment, the plurality of feedback parameter sets includes a first feedback parameter set and a second feedback parameter set, and the grouping sub-module 211 may include: a first dividing unit 2111, adapted to divide, for all feedback parameters in the Type II codebook, feedback parameters other than the reference coefficient amplitude value, the non-zero difference amplitude sequence, and the phase sequence into the first feedback parameter group; a first generating unit 2112 adapted to form the first set of elements based on respective elements within the non-zero differential amplitude sequence and the second set of elements based on respective elements within the phase sequence; a second dividing unit 2113, adapted to divide the first element set, the second element set, and the reference coefficient amplitude value into the second feedback parameter group, where each element in the non-zero differential amplitude sequence corresponds to each element in the phase sequence one to one; a first setting unit 2114 adapted to set a priority of the first feedback parameter set higher than a priority of the second feedback parameter set.
At this time, the discarding module 22 may include: a first discarding sub-module 221 adapted to discard all feedback parameters of said second set of feedback parameters.
In another embodiment, the plurality of feedback parameter sets includes a first feedback parameter set, a second feedback parameter set, and a third feedback parameter set, and the grouping sub-module 211 may include: a third dividing unit 2115A, adapted to divide, for all feedback parameters in the TypeII codebook, feedback parameters other than the reference coefficient amplitude value, the non-zero differential amplitude sequence, and the phase sequence into the first feedback parameter group; a fourth dividing unit 2115B, adapted to divide the reference coefficient amplitude value, each element located at the first position in the non-zero differential amplitude sequence, and each element located at the first position in the phase sequence into the second feedback parameter group, where each element in the non-zero differential amplitude sequence and each element in the phase sequence are in a one-to-one correspondence; a second generating unit 2115C, adapted to take each element in the non-zero differential amplitude sequence at a second position as an element in the first element set, and take each element in the phase sequence at the second position as an element in the second element set; a fifth dividing unit 2115D, adapted to divide the first element set and the second element set into the third feedback parameter group; a second setting unit 2115E adapted to set priorities of the first feedback parameter group, the second feedback parameter group, and the third feedback parameter group to be sequentially lowered; wherein the first position is one of an odd position and an even position, and the second position is the other of the odd position and the even position.
In a specific implementation, the discarding module 22 may include: a second discarding submodule 222, adapted to preferentially discard all feedback parameters in the third set of feedback parameters.
In another embodiment, the plurality of feedback parameter sets includes a first feedback parameter set, a second feedback parameter set, and a third feedback parameter set, and the grouping sub-module 211 may include: a sixth dividing unit 2116A, adapted to divide, for all feedback parameters in the TypeII codebook, feedback parameters other than the reference coefficient amplitude value, the non-zero differential amplitude sequence, and the phase sequence into the first feedback parameter group; a third generating unit 2116B, adapted to use M non-zero differential amplitude elements with the smallest amplitude in the non-zero differential amplitude sequence as elements of the first element set, and use M phase elements corresponding to the M non-zero differential amplitude elements as elements of the second element set, where the M phase elements are located in the phase sequence, and M is a positive integer; a seventh dividing unit 2116C, adapted to divide the first element set and the second element set into the second feedback parameter set, where each element in the non-zero differential amplitude sequence corresponds to each element in the phase sequence one to one; an eighth dividing unit 2116D, adapted to divide the reference coefficient amplitude value, the remaining non-zero differential amplitude elements in the non-zero differential amplitude sequence except the M non-zero differential amplitude elements, and the remaining phase elements in the phase sequence except the M phase elements into the third feedback parameter group; a third setting unit 2116E, adapted to set priorities of the first feedback parameter group, the third feedback parameter group and the second feedback parameter group to decrease in sequence.
The non-zero coefficient index is an index of each element in the non-zero differential amplitude sequence, and the discarding module 22 is adapted to complete the following steps: step A, discarding all feedback parameters in the second feedback parameter group; step B, judging whether to continuously discard at least one part of parameters in the third feedback parameter group; step C, if the discarding is stopped, updating the non-zero coefficient index and ending, otherwise, continuously discarding at least one part of the parameters in the third feedback parameter group, where the continuously discarding at least one part of the parameters in the third feedback parameter group includes: for all feedback parameters in the third feedback parameter group, selecting M non-zero differential amplitude elements with the minimum amplitude from the other non-zero differential amplitude elements, dividing the selected M non-zero differential amplitude elements and M phase elements corresponding to the M non-zero differential amplitude elements into the second feedback parameter group, updating the third feedback parameter group so that the updated third feedback parameter group includes the other feedback parameters except all the feedback parameters in the second feedback parameter group, deleting all the feedback parameters in the second feedback parameter group, and turning to step B.
In a specific implementation, M is a preset value, or a preconfigured value.
In a specific implementation, when there are a plurality of layers, the number of the non-zero differential amplitude sequences is multiple, and the number of the phase sequences is multiple, wherein each non-zero differential amplitude sequence is composed of the non-zero differential amplitude of each layer, and each phase sequence is composed of the phase of each layer.
In a specific implementation, when there are a plurality of layers, the number of the non-zero differential amplitude sequences is 1, the number of the phase sequences is 1, the non-zero differential amplitude sequence is composed of the non-zero differential amplitudes of all the layers, and the phase sequence is composed of the phases of all the layers.
In one embodiment, the other feedback parameters may include a spatial domain beam index set, a frequency domain beam index set, a strongest coefficient index, a non-zero coefficient index.
In a specific implementation, the reporting device 2 may further include: a sending module 24 adapted to send the CSI.
For more contents of the working principle and the working mode of the reporting apparatus 2, reference may be made to the related description in fig. 1, which is not described herein again.
Further, the embodiment of the present invention further discloses a storage medium, on which computer instructions are stored, and when the computer instructions are executed, the method technical solution described in the embodiment shown in fig. 1 is executed. Preferably, the storage medium may include a computer-readable storage medium such as a non-volatile (non-volatile) memory or a non-transitory (non-transient) memory. The computer readable storage medium may include ROM, RAM, magnetic or optical disks, and the like.
Further, an embodiment of the present invention further discloses a terminal, which includes a memory and a processor, where the memory stores a computer instruction capable of running on the processor, and the processor executes the technical solution of the method in the embodiment shown in fig. 1 when running the computer instruction. Preferably, the terminal may be an NR UE.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (17)

1. A method for reporting CSI feedback parameters is characterized in that the feedback parameters include a Type II codebook in CSI, and the method comprises the following steps:
if at least one part of the feedback parameters needs to be discarded, setting the priority of the feedback parameters, and setting the priority of each element in a first element set and a second element set in the feedback parameters as the lowest priority;
discarding each element of the lowest priority in the feedback parameters;
the first element set comprises at least part of elements of a non-zero differential amplitude sequence in the Type II codebook, the second element set comprises at least part of elements of a phase sequence in the Type II codebook, and each element in the first element set is in one-to-one correspondence with each element in the second element set.
2. The reporting method of claim 1, wherein before setting the priority of the feedback parameter, the reporting method further comprises:
determining whether to discard at least a portion of the feedback parameters.
3. The reporting method of claim 1, wherein the setting the priority of the feedback parameter comprises:
grouping all feedback parameters in the Type II codebook, and setting priorities to obtain a plurality of feedback parameter groups with different priorities;
wherein the priority of the feedback parameter set including each element in the first and second element sets is at the lowest priority.
4. The reporting method of claim 3, wherein the plurality of feedback parameter groups comprises a first feedback parameter group and a second feedback parameter group, and wherein the grouping and prioritizing all the feedback parameters in the Type II codebook comprises:
for all feedback parameters in the Type II codebook, dividing other feedback parameters except a reference coefficient amplitude value, a non-zero difference amplitude sequence and a phase sequence into the first feedback parameter group;
forming the first set of elements based on respective elements within the non-zero differential amplitude sequence and the second set of elements based on respective elements within the phase sequence;
dividing the first set of elements, the second set of elements, and a reference coefficient amplitude value into the second set of feedback parameters, each element in the non-zero differential amplitude sequence corresponding to each element in the phase sequence one-to-one;
setting a priority of the first feedback parameter group higher than a priority of the second feedback parameter group.
5. The reporting method of claim 4, wherein the discarding the elements with the lowest priority in the feedback parameters comprises:
discarding all feedback parameters in the second set of feedback parameters.
6. The reporting method of claim 3, wherein the plurality of feedback parameter groups include a first feedback parameter group, a second feedback parameter group, and a third feedback parameter group, and wherein the grouping and prioritizing all the feedback parameters in the Type II codebook comprises:
for all feedback parameters in the Type II codebook, dividing other feedback parameters except a reference coefficient amplitude value, a non-zero difference amplitude sequence and a phase sequence into the first feedback parameter group;
dividing a reference coefficient amplitude value, each element located at a first position in the non-zero differential amplitude sequence, and each element located at the first position in the phase sequence into the second feedback parameter group, wherein each element in the non-zero differential amplitude sequence and each element in the phase sequence are in one-to-one correspondence;
taking each element in the non-zero differential amplitude sequence at a second position as an element in the first element set, and taking each element in the phase sequence at the second position as an element in the second element set;
dividing the first element set and the second element set into the third feedback parameter group;
setting priorities of the first feedback parameter group, the second feedback parameter group and the third feedback parameter group to be sequentially reduced;
wherein the first position is one of an odd position and an even position, and the second position is the other of the odd position and the even position.
7. The reporting method of claim 6, wherein the discarding the elements with the lowest priority in the feedback parameters comprises:
preferentially discarding all feedback parameters in the third set of feedback parameters.
8. The reporting method of claim 3, wherein the plurality of feedback parameter groups include a first feedback parameter group, a second feedback parameter group, and a third feedback parameter group, and wherein the grouping and prioritizing all the feedback parameters in the Type II codebook comprises:
for all feedback parameters in the Type II codebook, dividing other feedback parameters except a reference coefficient amplitude value, a non-zero difference amplitude sequence and a phase sequence into the first feedback parameter group;
taking M non-zero differential amplitude elements with the minimum amplitude in the non-zero differential amplitude sequence as elements of the first element set, and taking M phase elements corresponding to the M non-zero differential amplitude elements as elements of the second element set, where the M phase elements are located in the phase sequence, and M is a positive integer;
dividing the first element set and the second element set into the second feedback parameter set, wherein each element in the non-zero differential amplitude sequence corresponds to each element in the phase sequence one to one;
dividing a reference coefficient amplitude value, the remaining non-zero difference amplitude elements in the non-zero difference amplitude sequence except the M non-zero difference amplitude elements, and the remaining phase elements in the phase sequence except the M phase elements into the third feedback parameter group;
setting priorities of the first feedback parameter group, the third feedback parameter group, and the second feedback parameter group to be sequentially lower.
9. The reporting method of claim 8, wherein the nonzero coefficient index is an index of each element in the nonzero differential amplitude sequence, and the discarding of each element with the lowest priority in the feedback parameters comprises:
step A, discarding all feedback parameters in the second feedback parameter group;
step B, judging whether to continuously discard at least one part of parameters in the third feedback parameter group;
step C, if the discarding is stopped, updating the non-zero coefficient index and ending, otherwise, continuously discarding at least one part of the parameters in the third feedback parameter group, where the continuously discarding at least one part of the parameters in the third feedback parameter group includes:
for all feedback parameters in the third feedback parameter group, selecting M non-zero differential amplitude elements with the minimum amplitude from the rest non-zero differential amplitude elements, and dividing the selected M non-zero differential amplitude elements and M phase elements corresponding to the M non-zero differential amplitude elements into the second feedback parameter group,
updating the third feedback parameter set such that the updated third feedback parameter set includes the remaining feedback parameters except for all feedback parameters in the second feedback parameter set,
and deleting all feedback parameters in the second feedback parameter group, and turning to the step B.
10. A reporting method according to claim 8 or 9, wherein M is a preset value, or a preconfigured value.
11. The reporting method according to claim 6 or 8, wherein when there are multiple layers, the number of the non-zero differential amplitude sequences is multiple, and the number of the phase sequences is multiple, wherein each non-zero differential amplitude sequence is composed of the non-zero differential amplitude of each layer, and each phase sequence is composed of the phase of each layer.
12. The reporting method according to claim 6 or 8, wherein when there are multiple layers, the number of the non-zero differential amplitude sequences is 1, the number of the phase sequences is 1, the non-zero differential amplitude sequences are composed of non-zero differential amplitudes of all layers, and the phase sequences are composed of phases of all layers.
13. A reporting method according to claim 4, 6 or 8, wherein the other feedback parameters include a spatial beam index set, a frequency domain beam index set, a strongest coefficient index, and a non-zero coefficient index.
14. The reporting method of claim 1, further comprising:
and transmitting the CSI.
15. An apparatus for reporting CSI feedback parameters, wherein the feedback parameters include a Type II codebook in CSI, the apparatus comprising:
a setting module, adapted to set a priority of the feedback parameter if at least a portion of the feedback parameter needs to be discarded, and set the priority of each element in the first element set and the second element set in the feedback parameter to a lowest priority;
a discarding module adapted to discard elements of lowest priority in the feedback parameters;
the first element set comprises at least part of elements of a non-zero differential amplitude sequence in the Type II codebook, the second element set comprises at least part of elements of a phase sequence in the Type II codebook, and each element in the first element set is in one-to-one correspondence with each element in the second element set.
16. A storage medium having stored thereon computer instructions, characterized in that the computer instructions are operative to perform the steps of the method of any one of claims 1 to 14.
17. A terminal comprising a memory and a processor, the memory having stored thereon computer instructions executable on the processor, wherein the processor, when executing the computer instructions, performs the steps of the method of any one of claims 1 to 14.
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