CN111757382A

CN111757382A - Method for indicating channel state information and communication device

Info

Publication number: CN111757382A
Application number: CN201910240119.9A
Authority: CN
Inventors: 高翔; 刘鹍鹏; 王潇涵
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-03-27
Filing date: 2019-03-27
Publication date: 2020-10-09
Anticipated expiration: 2039-03-27
Also published as: CN111757382B

Abstract

The application provides a method for indicating Channel State Information (CSI) and a communication device, wherein the method comprises the following steps: the terminal equipment generates a CSI report, wherein the CSI report at least comprises a first part, the first part comprises R fields, and R is a predefined maximum space layer number; the R field is used to indicate whether there is a space-frequency combining coefficient reported in a first polarization direction corresponding to each spatial layer in the R spatial layers, where the first polarization direction is a polarization direction other than the polarization direction in which the first space-frequency combining coefficient in each spatial layer is located, and the first space-frequency combining coefficient is a space-frequency combining coefficient with a largest amplitude value among the space-frequency combining coefficients reported in each spatial layer; r is an integer greater than or equal to 1; the terminal device sends the CSI report to the network device. The method for indicating the CSI in the embodiment of the application is beneficial to reducing the expense of CSI reporting.

Description

Method for indicating channel state information and communication device

Technical Field

The present application relates to the field of wireless communications, and more particularly, to a method of indicating channel state information and a communication apparatus.

Background

In a large-scale multiple-input multiple-output (massive mimo) technology, a network device can reduce interference among multiple users and interference among multiple signal streams of the same user through precoding, which is beneficial to improving signal quality, realizing space division multiplexing and improving spectrum utilization rate.

For space-frequency compressed codebooks, the main overhead is to indicate the location of the reported combining coefficients and the quantized values of amplitude and phase. Wherein the reported merging coefficient position is indicated by bitmap. Based on the current standardization conclusion, in a partial scene, the bitmap overhead for indicating the positions of the merging coefficients is large, and the maximum overhead is as high as 80 bits. Therefore, how to minimize the Channel State Information (CSI) reporting overhead is a problem to be solved.

Disclosure of Invention

The application provides a method for indicating Channel State Information (CSI) and a communication device, which aim to reduce the cost of CSI reporting.

In a first aspect, a method of indicating channel state information, CSI, is provided. The method may be performed by the terminal device, or may be performed by a chip configured in the terminal device.

Specifically, the method comprises the following steps: generating a CSI report, the CSI report comprising at least a first portion, the first portion comprising R fields, R being a predefined maximum number of spatial layers; the R field is used to indicate whether there is a space-frequency combining coefficient reported in a first polarization direction corresponding to each space layer in the R space layers, where the first polarization direction is a polarization direction other than the polarization direction in which the first space-frequency combining coefficient in each space layer is located, and the first space-frequency combining coefficient is the space-frequency combining coefficient with the largest amplitude value among the space-frequency combining coefficients reported in each space layer; r is an integer greater than or equal to 1; and sending the CSI report.

In some possible implementations, the method includes: generating a CSI report, the CSI report comprising at least a first portion, the first portion comprising R fields, R being a predefined maximum number of spatial layers; the R field is used to indicate that the reported space-frequency combining coefficients corresponding to each of the R spatial layers are all located in a second polarization direction, where the second polarization direction is a polarization direction in which a first space-frequency combining coefficient in each of the spatial layers is located, and the first space-frequency combining coefficient is a space-frequency combining coefficient with a largest amplitude value among the space-frequency combining coefficients reported by each of the spatial layers; r is an integer greater than or equal to 1; and sending the CSI report.

In some possible implementations, the method includes: generating a CSI report, the CSI report comprising at least a first portion, the first portion comprising R fields, R being a predefined maximum number of spatial layers; the R fields are used to indicate whether bit map is all 0 in one polarization direction in the R spatial layers, R is an integer greater than or equal to 1; and sending the CSI report. Optionally, the polarization direction corresponding to one bitmap with 0 is the first polarization direction, and the first space-frequency combining coefficient is the space-frequency combining coefficient with the largest amplitude value among the space-frequency combining coefficients reported by each space layer.

In some possible implementations, the method includes: generating a CSI report, the CSI report comprising at least a first portion, the first portion comprising R fields, R being a predefined maximum number of spatial layers; the R fields are used to indicate whether a quantization reference amplitude corresponding to each spatial layer in the R spatial layers is a preset value, where the quantization reference amplitude may be a reference amplitude in a polarization direction other than a polarization direction in which a first space-frequency combining coefficient is located in space-frequency combining coefficients reported by each spatial layer, and the first space-frequency combining coefficient is a space-frequency combining coefficient with a largest amplitude value among the space-frequency combining coefficients reported by each spatial layer; r is an integer greater than or equal to 1; and sending the CSI report.

It should be understood that the quantized reference amplitude is a reference amplitude in the first polarization direction in each spatial layer, and the reference amplitude in the second polarization direction in each spatial layer may be 1. The second polarization direction may be the polarization direction of the first space-frequency combining coefficient.

In the embodiment of the present application, the polarization directions may be distinguished by antenna port indexes or spatial beam basis vector indexes, or one polarization direction corresponds to a group of antenna port indexes or spatial beam basis vector indexes. Illustratively, the 0-L-1 spatial beam basis vector index corresponds to the polarization direction 0, and the L-2L-1 spatial beam basis vector index corresponds to the polarization direction 1.

In a second aspect, a method of indicating channel state information, CSI, is provided. The method may be performed by a network device, or may be performed by a chip configured in the network device.

Specifically, the method comprises the following steps: receiving a CSI report, the CSI report including at least a first portion, the first portion including R fields, R being a predefined maximum number of spatial layers; the R field is used to indicate whether there is a space-frequency combining coefficient reported in a first polarization direction corresponding to each space layer in the R space layers, where the first polarization direction is a polarization direction other than the polarization direction in which the first space-frequency combining coefficient in each space layer is located, and the first space-frequency combining coefficient is the space-frequency combining coefficient with the largest amplitude value among the space-frequency combining coefficients reported in each space layer; r is an integer greater than or equal to 1; and determining precoding matrixes corresponding to the Q spatial layers according to the first part, wherein Q is the number of the spatial layers indicated by the Rank Indication (RI) in the first part. In some possible implementations, the method includes: receiving a CSI report, the CSI report comprising at least a first portion, the first portion comprising R fields, R being a predefined maximum number of spatial layers; the R fields are used to indicate whether a quantized reference amplitude reported by each spatial layer in the R spatial layers is a preset value, where the quantized reference amplitude is a reference amplitude in a polarization direction other than a polarization direction in which a first space-frequency combining coefficient is located in space-frequency combining coefficients reported by each spatial layer, and the first space-frequency combining coefficient is a space-frequency combining coefficient with a largest amplitude value among the space-frequency combining coefficients reported by each spatial layer; r is an integer greater than or equal to 1; and determining precoding matrixes corresponding to the Q spatial layers according to the first part, wherein Q is the number of the spatial layers indicated by the Rank Indication (RI) in the first part.

In some possible implementations, the method includes: receiving a CSI report, the CSI report including at least a first portion, the first portion including R fields, R being a predefined maximum number of spatial layers; the R field is used to indicate that the space-frequency combining coefficients reported by each of the R spatial layers are all located in a second polarization direction, where the second polarization direction is a polarization direction of a first space-frequency combining coefficient in each of the spatial layers, and the first space-frequency combining coefficient is a space-frequency combining coefficient with a largest amplitude value among the space-frequency combining coefficients reported by each of the spatial layers; r is an integer greater than or equal to 1; and determining precoding matrixes corresponding to the Q spatial layers according to the first part, wherein Q is the number of the spatial layers indicated by the Rank Indication (RI) in the first part.

Based on the above design, if a spatial layer does not have a space-frequency combining coefficient to report in the first polarization direction, or the reported space-frequency combining coefficients corresponding to the spatial layer are all located in the second polarization direction, or elements in a bitmap indicating the reported combining coefficient position corresponding to the spatial layer in the first polarization direction are all 0, or a quantized reference amplitude corresponding to the spatial layer is a preset value (e.g., 0), it indicates that no combining coefficient needs to be reported in another polarization direction other than the polarization direction where the strongest (strongest) space-frequency combining coefficient corresponding to the spatial layer is located. Accordingly, it may be determined that, in the CSI part2, the bitmap length indicating the position of the corresponding merging coefficient of the spatial layer may be halved (e.g., the length is L × M). If a spatial layer has a space-frequency combining coefficient reporting in the first polarization direction, or if elements in a bitmap of the spatial layer corresponding to the indication reporting combining coefficient position in the first polarization direction are not all 0, or if a quantization reference amplitude corresponding to the spatial layer is not 0, the length of the bitmap of the combining coefficient position corresponding to the spatial layer is indicated to be 2 × L × M. So that the bitmap overhead of indicating the positions of the space-frequency merging coefficients can be reduced.

With reference to the first aspect or the second aspect, in some implementations, the CSI further includes a second part, where the second part includes P fields, P is a number of spatial layers of the Q spatial layers that have no space-frequency combining coefficient reported in the first polarization direction, and an mth field of the P fields is used to indicate a polarization direction in which the first space-frequency combining coefficient is located in an mth spatial layer that has no space-frequency combining coefficient reported in the first polarization direction; q is more than or equal to P and more than or equal to 1, m is more than or equal to 1 and less than or equal to P, and m and P are integers.

In some possible implementations, P is the number of spatial layers with preset quantized reference amplitude in the Q spatial layers, and an mth field in the P fields is used to indicate a polarization direction in which the first space-frequency combining coefficient is located in the spatial layer with preset quantized reference amplitude; q is more than or equal to P and more than or equal to 1, m is more than or equal to 1 and less than or equal to P, and m and P are integers.

In this embodiment of the application, P fields are indicated in the second portion, which helps the network device to determine a spatial layer where no space-frequency combining coefficient is reported in the first polarization direction and a second polarization direction where the space-frequency combining coefficient is reported by the terminal device, so that the network device is helped to determine a position of the space-frequency combining coefficient in the second polarization direction.

With reference to the first aspect or the second aspect, in some implementations, the second portion further includes L × M bits, where the L × M bits are used to indicate a position of the space-frequency combining coefficient reported in a polarization direction of the first combining coefficient in the M spatial layers; and L and M are respectively the number of space domain basis vectors and the number of frequency domain basis vectors in the space layer reported by the mth space-frequency combination coefficient in the first polarization direction, and both L and M are positive integers. Each bit in the L × M bits corresponds to one space domain basis vector and one frequency domain basis vector, and when a bit in the L × M bits takes a value of 1, it indicates that the space domain basis vector corresponding to the bit and the merging coefficient corresponding to the frequency domain basis vector need to be reported.

Taking the number of space-frequency basis vectors of each spatial layer as L and the number of frequency-frequency basis vectors as M as an example, the second portion may include P × L × M bits, where the P × L × M bits are used to indicate positions of space-frequency merging coefficients corresponding to the P spatial layers.

Therefore, the network device can determine the position of the space-frequency merging coefficient reported by the M spatial layer through L × M bits. That is, the space-domain basis vector index and the frequency-domain basis vector index corresponding to the space-frequency merging coefficient reported by the mth space layer can be determined by L × M bits. For L space-domain basis vectors and M frequency-domain basis vectors corresponding to each polarization direction of a space layer, L × M space-frequency combining coefficients are counted, and a bitmap (bitmap) with L × M bits can be used to indicate the space-domain basis vectors and the frequency-domain basis vectors corresponding to the reported space-frequency combining coefficients. And the L M bits correspond to the L M space-frequency merging coefficients one by one. Usually, the ith bit in a bitmap (bitmap) takes a value of 1, which indicates that the ith space-frequency merging coefficient in the L × M space-frequency merging coefficients needs to be reported. Otherwise, the ith bit in the bitmap (bitmap) takes a value of 0, which indicates that the ith space-frequency combining coefficient in the L × M space-frequency combining coefficients cannot be reported, that is, the combining coefficient is 0.

With reference to the first aspect or the second aspect, in some implementations, the first portion further includes a rank indication RI indicating a number of spatial layers Q, and in a case that (Q-P) is greater than 0, the second portion further includes a quantized reference amplitude corresponding to each of the (Q-P) spatial layers.

In this embodiment of the present application, if a spatial layer does not have a space-frequency combination coefficient to report in the first polarization direction, or a quantization reference amplitude corresponding to a spatial layer is a preset value (e.g., 0), the terminal device may choose not to report the quantization reference amplitude of the spatial layer.

In some possible implementations, the first portion further includes a rank indicator RI, where the number of spatial layers indicated by the rank indicator RI is Q, and in a case where (Q-K) is greater than 0, the second portion further includes 2 × L × M bits, where the 2 × L × M bits are used to indicate a position of a j-th spatial layer in the (Q-K) spatial layers where there is a space-frequency combining coefficient reported in the first polarization direction, j is greater than or equal to 1 and less than or equal to (Q-K), and j is an integer; and L and M are respectively the number of space domain basis vectors and the number of frequency domain basis vectors in the space layer reported by the jth space-frequency merging coefficient in the first polarization direction, and both L and M are positive integers.

In the implementation of the present application, since the ith spatial layer does not have a space-frequency combination coefficient to report in the first polarization direction, or when the quantization reference amplitude corresponding to the ith spatial layer is 0, the terminal device may further indicate the polarization direction in which no combination coefficient is reported in the second part, so that the bitmap overhead indicating the position of the space-frequency combination coefficient may be reduced.

In a third aspect, a method of indicating channel state information, CSI, is provided. The method may be performed by the terminal device, or may be performed by a chip configured in the terminal device.

Specifically, the method comprises the following steps: generating a CSI report, where the CSI report at least includes a first part, where the first part includes first indication information, where the first indication information is used to indicate a number of spatial layers that have no space-frequency combination coefficients reported in a first polarization direction, where the number is less than or equal to a predefined maximum number R of spatial layers, the first polarization direction is a polarization direction other than a polarization direction in which a first space-frequency combination coefficient in each spatial layer of the R spatial layers is located, and the first space-frequency combination coefficient is a space-frequency combination coefficient with a maximum amplitude value among the space-frequency combination coefficients reported in each spatial layer; r is an integer greater than or equal to 1; and sending the CSI report.

In some possible implementations, the method includes: generating a CSI report, where the CSI report at least includes a first part, where the first part includes first indication information, where the first indication information is used to indicate a number of spatial layers in a second polarization direction, where all reported space-frequency combining coefficients are located, where the number is smaller than a predefined maximum number R of spatial layers, the second polarization direction is a polarization direction in which a first space-frequency combining coefficient in each spatial layer of the R spatial layers is located, and the first space-frequency combining coefficient is a space-frequency combining coefficient with a largest amplitude value among the space-frequency combining coefficients reported by each spatial layer; r is an integer greater than or equal to 1; and sending the CSI report.

In some possible implementations, the method includes: generating a CSI report, the CSI report including at least a first part, the first part including first indication information, the first indication information indicating a number of spatial layers for which the bitmap is all 0 in one polarization direction, the number being less than a predefined maximum number R of spatial layers, R being an integer greater than or equal to 1; and sending the CSI report. Optionally, the polarization direction in which the bitmap is all 0 may be a first polarization direction, and the first space-frequency combining coefficient is a space-frequency combining coefficient with a maximum amplitude value among the space-frequency combining coefficients reported by each spatial layer.

In some possible implementations, the method includes: generating a CSI report, where the CSI report at least includes a first part, where the first part includes first indication information, where the first indication information is used to indicate a number of spatial layers of which quantized reference amplitude is a preset value, where the number is less than or equal to a predefined maximum number R of spatial layers, the quantized reference amplitude is a reference amplitude in a polarization direction except a polarization direction in which a first space-frequency combining coefficient is located in space-frequency combining coefficients reported by each spatial layer, and the first space-frequency combining coefficient is a space-frequency combining coefficient of which amplitude is the maximum among the space-frequency combining coefficients reported by each spatial layer; r is an integer greater than or equal to 1; and sending the CSI report.

In a fourth aspect, a method of indicating channel state information, CSI, is provided. The method may be performed by a network device, or may be performed by a chip configured in the network device.

Specifically, the method comprises the following steps: receiving a CSI report, where the CSI report at least includes a first portion, where the first portion includes first indication information, where the first indication information is used to indicate a number of spatial layers that have no space-frequency combination coefficients reported in a first polarization direction, where the number is less than a predefined maximum number R of spatial layers, the first polarization direction is a polarization direction other than a polarization direction in which a first space-frequency combination coefficient in each spatial layer of the R spatial layers is located, and the first space-frequency combination coefficient is a space-frequency combination coefficient with a maximum amplitude value among the space-frequency combination coefficients reported in each spatial layer; r is an integer greater than or equal to 1; and determining precoding matrixes corresponding to the Q spatial layers according to the first part, wherein Q is the number of the spatial layers indicated by the Rank Indication (RI) in the first part.

In some possible implementations, the method includes: receiving a CSI report, where the CSI report at least includes a first portion, where the first portion includes first indication information, where the first indication information is used to indicate a number of spatial layers in which all space-frequency combining coefficients are located in a second polarization direction, where the number is smaller than a predefined maximum number R of spatial layers, the second polarization direction is a polarization direction in which a first space-frequency combining coefficient in each spatial layer of the R spatial layers is located, and the first space-frequency combining coefficient is a space-frequency combining coefficient with a largest amplitude value among the space-frequency combining coefficients reported by each spatial layer; r is an integer greater than or equal to 1; and determining precoding matrixes corresponding to the Q spatial layers according to the first part, wherein Q is the number of the spatial layers indicated by the Rank Indication (RI) in the first part.

In some possible implementations, the method includes: receiving a CSI report, where the CSI report at least includes a first part, where the first part includes first indication information, where the first indication information is used to indicate a number of spatial layers of which quantized reference amplitude is a preset value, where the number is smaller than a predefined maximum number R of spatial layers, the quantized reference amplitude is a reference amplitude in a polarization direction, except for the polarization direction of a first space-frequency combining coefficient, of space-frequency combining coefficients reported by each spatial layer, and the first space-frequency combining coefficient is a space-frequency combining coefficient with a maximum amplitude value among the space-frequency combining coefficients reported by each spatial layer; r is an integer greater than or equal to 1; and determining precoding matrixes corresponding to the Q spatial layers according to the first part, wherein Q is the number of the spatial layers indicated by the Rank Indication (RI) in the first part.

Based on the above design, if the quantization reference amplitude corresponding to one spatial layer is 0, or the reported space-frequency combination coefficients corresponding to one spatial layer are all located in one polarization direction, it indicates that no combination coefficient needs to be reported in another polarization direction other than the polarization direction in which the strongest space-frequency combination coefficient corresponding to the spatial layer is located. Accordingly, it may be determined that, in the CSI part2, the bitmap length indicating the position of the corresponding merging coefficient of the spatial layer may be halved (for example, the length may be L × M). Under the condition that the number of the space domain basis vectors and the number of the frequency domain basis vectors configured for all the space layers are the same, the CSI part 1 can determine the bitmap overhead indicating the positions of the space-frequency combining coefficients corresponding to all the space layers in the CSI part2 only by indicating the total number of the quantization reference amplitudes of all the space layers as 0 or only by indicating the total number of all the space layers reported without the space-frequency combining coefficients in the first polarization direction. The CSI part 1 indicates the total number of all spatial layers with quantization reference amplitude of 0, or indicates the total number of all spatial layers reported without space frequency combining coefficients in the first polarization direction. Therefore, for different rank, the overhead variation range of the indication information is very small, so that the requirement of CSI part 1 on fixed overhead can be well met, and the overhead waste caused by rank variation is reduced.

With reference to the third aspect or the fourth aspect, in some possible implementations, the CSI report further includes a second portion, where the second portion includes second indication information, and the second indication information is used to indicate whether each of the Q spatial layers has an air-frequency combining coefficient to report in the first polarization direction.

In some possible implementations, the second indication information may be Q bits, and the Q bits may indicate whether each of the Q spatial layers has an empty frequency combining coefficient to report in the first polarization direction.

In some possible implementations, the second indication information is the Q bits, and in case (Q-K) is greater than 0, the second portion may further include quantized reference amplitudes corresponding to each of the (Q-K) spatial layers.

It should be understood that if part 1 indicates that the number of spatial layers reported without the space-frequency combination coefficient in the first polarization direction is not 0, the terminal device may carry the Q bits in the second indication information. If the number of spatial layers reported without the space-frequency combining coefficient in the first polarization direction is indicated to be 0 in part 1, that is, there is no spatial layer reported without the space-frequency combining coefficient in the first polarization direction, the terminal device may not carry the Q bits in the second indication information.

In some possible implementations, the second indication information may be a quantized reference amplitude corresponding to each spatial layer, and when the quantized reference amplitude of each spatial layer is a preset value, the second indication information may implicitly indicate that no space-frequency combination coefficient is reported in a first polarization direction corresponding to the spatial layer.

In the embodiment of the present application, the first indication information indicates only the number of spatial layers without reporting the space-frequency combination coefficient in the first polarization direction, or indicates only the number of spatial layers with a quantization reference amplitude being a preset value. It needs to indicate in the second indication information which spatial layers have no space-frequency combination coefficient to report in the first polarization direction, or it needs to indicate in the second indication information which spatial layers have corresponding quantization reference amplitudes as preset values.

With reference to the third aspect or the fourth aspect, in some possible implementations, the second portion further includes K bits, where K is the number of spatial layers that have no space-frequency combination coefficient reported in the first polarization direction, and an nth bit of the K bits is used to indicate a polarization direction in which the first combination coefficient is located in an nth spatial layer that has no space-frequency combination coefficient reported in the first polarization direction; q is more than or equal to K and more than or equal to 1, n is more than or equal to 1 and less than or equal to K, and K and n are integers.

In this embodiment of the present application, since the quantization reference amplitude corresponding to the ith spatial layer is a preset value, it means that there is no merging coefficient reporting in one polarization direction in the spatial layer. Only the total number of all spatial layer quantized reference amplitudes as preset values is indicated in the first section. Second indication information also exists in the second part, wherein the second indication information can be Q fields and is used for displaying and indicating whether each of the Q spatial layers has an audio-frequency merging coefficient to report in the first polarization direction; or, the second indication information may be a quantized reference amplitude of each spatial layer, and may implicitly indicate whether each spatial layer in the R spatial layers has an audio merging coefficient to report in the first polarization direction.

And further indicating the polarization direction reported by no merging coefficient in each spatial layer in the second part, so that the bitmap overhead of indicating the position of the space-frequency merging coefficient can be deleted.

In some possible implementations, K may also be understood as the number of spatial layers at which the quantization reference amplitude is a preset value.

With reference to the third aspect or the fourth aspect, in some possible implementations, the second portion further includes L₁*M₁A bit, the L₁*M₁The bit is used for indicating the position of the space-frequency merging coefficient reported by the polarization direction of the first merging coefficient in the nth spatial layer; l is₁And M₁The number of space domain basis vectors and the number of frequency domain basis vectors in the spatial layer reported by the nth space-frequency combination coefficient in the first polarization direction, L₁And M₁Are all positive integers.

With reference to the third aspect or the fourth aspect, in some possible implementations, the first part further includes a rank indicator RI, where the number of spatial layers indicated by the RI is Q, and in a case where (Q-K) is greater than 0, the second part further includes 2 × L₂*M₂A bit of 2 x L₂*M₂The bit is used for indicating the position of the space-frequency merging coefficient reported by the jth space layer in the (Q-K) space layers in the first polarization direction, j is more than or equal to 1 and less than or equal to (Q-K), and j is an integer; l is₂And M₂Respectively reporting the number of space domain basis vectors and the number of frequency domain basis vectors in the space layer with the space-frequency merging coefficient in the jth polarization direction, L₂And M₂Are all positive integers.

With reference to the third aspect or the fourth aspect, in some possible implementations, the overhead of the first indication information is

In a fifth aspect, a method of indicating channel state information, CSI, is provided. The method may be performed by the terminal device, or may be performed by a chip configured in the terminal device.

Specifically, the method comprises the following steps: generating a CSI report, the CSI report comprising at least a first portion, the first portion comprising R fields, R being a predefined maximum number of spatial layers; the R fields are used to indicate the number of first space-domain basis vectors in a space-frequency merging coefficient matrix corresponding to each of R space layers, where the first space-domain basis vectors are space-domain basis vectors reported by merging coefficients in the space-frequency merging coefficient matrix, or the first space-domain basis vectors are space-domain basis vectors reported by no merging coefficients in the space-frequency merging coefficient matrix; r is an integer greater than or equal to 1; and sending the CSI report.

In a sixth aspect, a method of indicating channel state information, CSI, is provided. The method may be performed by a network device, or may be performed by a chip configured in the network device.

Specifically, the method comprises the following steps: receiving a CSI report, the CSI report comprising at least a first portion, the first portion comprising R fields, R being a predefined maximum number of spatial layers; the R fields are used to indicate the number of first space-domain basis vectors in a space-frequency merging coefficient matrix corresponding to each of R space layers, where the first space-domain basis vectors are space-domain basis vectors reported by merging coefficients in the space-frequency merging coefficient matrix, or the first space-domain basis vectors are space-domain basis vectors reported by no merging coefficients in the space-frequency merging coefficient matrix; r is an integer greater than or equal to 1; and determining precoding matrixes corresponding to the Q spatial layers according to the first part, wherein Q is the number of the spatial layers indicated by the Rank Indication (RI) in the first part.

Based on the above design, the indicated granularity is further reduced to the level of spatial basis vectors. If the number of the spatial domain basis vectors which need to be reported without the merging coefficient corresponding to one spatial layer is X, all the spatial domain basis vectors of one spatial layer correspond to the same number of the frequency domain basis vectors. Accordingly, the bitmap length indicating the merging coefficient position corresponding to the spatial layer in the second portion may be determined to be (2L-X) × M or 2 × (L-X) × M. Therefore, the number of the space base vectors reported by the CSI part 1 indicating the existence of the merging coefficients corresponding to each spatial layer can determine the bitmap overhead of the second part indicating the position of the space-frequency merging coefficients corresponding to each spatial layer. Because each spatial layer has at most 8 space-domain basis vectors, the indication information indicating the number of the space-domain basis vectors reported by the merging coefficient in the first part corresponding to each spatial layer only needs 3 bits, and the requirement of the first part on the overhead can be better met.

With reference to the fifth aspect or the sixth aspect, in some possible implementations, the CSI report further includes a second part, where the second part includes Y fields, and Y is the number of spatial layers with spatial basis vectors without merging coefficient reporting in the R spatial layers; the ith field in the Y fields is used for indicating the index of a space-frequency base vector reported without a merging coefficient in a space-frequency merging coefficient matrix corresponding to the ith space layer without the merging coefficient; r is more than or equal to Y and more than or equal to 1, i is more than or equal to 1 and less than or equal to Y, and Y and i are integers.

With reference to the fifth aspect or the sixth aspect, in some possible implementations, the ith spatial layer with no merge coefficient reporting includes a first polarization direction and a second polarization direction, and the bit overhead of the ith field is

Wherein 2L is the number of space-domain basis vectors in the first polarization direction and the second polarization direction in the space layer corresponding to the space-domain basis vector reported by the ith space-frequency-free merging coefficient, and Z_iThe number of the space domain basis vectors reported by the merging coefficients in the 2L space domain basis vectors is shown.

With reference to the fifth aspect or the sixth aspect, in some possible implementations, the second part further includes Z_iM bits, the Z_iAnd M bits are used for indicating the position of the space-frequency merging coefficient reported by the spatial layer corresponding to the space-frequency basis vector reported by the ith space-frequency-free merging coefficient, and M is the number of the frequency-domain basis vectors in the spatial layer reported by the ith space-frequency-free merging coefficient.

Wherein, L is the number of the space domain base vectors in the space layer corresponding to the space domain base vector reported by the ith existence of the space-frequency merging coefficient, and Z_iIs the L-th space-domain basis vectorWherein the number of space-domain basis vectors reported by the combining coefficients is present in both the first polarization direction and the second polarization direction.

With reference to the fifth aspect or the sixth aspect, in some possible implementations, the second portion further includes 2 × Z_iM bits, 2X Z_iAnd M bits are used for indicating the position of the space-frequency merging coefficient reported by the spatial layer corresponding to the space-frequency basis vector reported by the ith space-frequency-merging-coefficient-free existence, and M is the number of the frequency-domain basis vectors in the spatial layer reported by the ith space-frequency-merging-coefficient-free existence.

In embodiments of the present application, the network device may dynamically determine the overhead in the second portion based on the indication in the first portion. If one or more space-domain basis vectors without merging coefficients need to be reported in one space layer, the space-domain basis vectors without merging coefficients need to be reported are further indicated in the second part by introducing fewer bits, so that the bitmap overhead of the indication space-frequency merging coefficient position corresponding to the corresponding space-domain basis vectors can be deleted.

In a seventh aspect, a communication method is provided, which may be executed by a terminal device or a chip configured in the terminal device.

Specifically, the method comprises the following steps: determining at least two space-frequency merging coefficients; wherein at least one space-frequency combining coefficient is associated with a first polarization direction; and at least one space-frequency combining coefficient is associated with the second polarization direction; and transmitting the at least two space-frequency combination coefficients.

In some possible implementations, the terminal device receives indication information, where the indication information is used to indicate the number L of spatial basis vectors corresponding to each spatial layer, the number M of frequency basis vectors, and a maximum value K0 of the number of space-frequency combining coefficients reported by each spatial layer. And for each spatial layer, the terminal equipment reports K1 space-frequency merging coefficients, and K1 is not more than K0. At least one space-frequency merging coefficient in the K1 space-frequency merging coefficients reported by the terminal equipment corresponds to the first polarization direction. The first polarization direction is a polarization direction other than the polarization direction in which the first space-frequency combining coefficient in each spatial layer is located, and the first space-frequency combining coefficient is a space-frequency combining coefficient with the largest amplitude value in the space-frequency combining coefficient matrix corresponding to each spatial layer.

Based on the design, at least one space-frequency merging coefficient exists in each of the 2 polarization directions for reporting. The situation that one polarization direction of elements in the precoding matrix is all 0 is avoided, and therefore verification loss of system performance caused by the extreme realization method of the terminal equipment is avoided.

In an eighth aspect, a communication method is provided, which may be performed by a network device or a chip configured in the network device.

Specifically, the method comprises the following steps: receiving at least two space-frequency merging coefficients; wherein at least one space-frequency combining coefficient is associated with a first polarization direction; and at least one space-frequency combining coefficient is associated with the second polarization direction; transmitting the at least two space-frequency merging coefficients; and determining a precoding matrix according to the at least two space-frequency combination coefficients.

In a ninth aspect, a communication method is provided, which may be performed by a terminal device or may be performed by a chip configured in the terminal device.

Specifically, the method comprises the following steps: generating a CSI report, wherein the CSI report comprises at least two bit maps, and the at least two bit maps indicate the positions of space-frequency merging coefficients; the at least two bitmaps are associated with a first spatial layer; wherein at least one of the at least two bit patterns associated with the first spatial layer is associated with a first polarization direction, another bit pattern is associated with a second polarization direction, and at least 1 bit value of the bit pattern associated with the first polarization direction is 1 and at least 1 bit value of the bit pattern associated with the second polarization direction is 1; and sending the CSI report.

In a tenth aspect, a communication method is provided, which may be performed by a network device or a chip configured in the network device.

Specifically, the method comprises the following steps: receiving a CSI report, wherein the CSI report comprises at least two bit maps, and the at least two bit maps indicate the positions of space-frequency merging coefficients; the at least two bitmaps are associated with a first spatial layer; wherein at least one of the at least two bit patterns associated with the first spatial layer is associated with a first polarization direction, another bit pattern is associated with a second polarization direction, and at least 1 bit value of the bit pattern associated with the first polarization direction is 1 and at least 1 bit value of the bit pattern associated with the second polarization direction is 1; and determining a precoding matrix according to the CSI report.

Wherein one space-frequency combining coefficient corresponds to one space-frequency basis vector and one frequency-frequency basis vector. And indicating the position of the space-frequency merging coefficient, namely indicating the space-domain basis vector and the frequency-domain basis vector associated with the reported space-frequency merging coefficient. For L space-domain basis vectors and M frequency-domain basis vectors corresponding to each polarization direction of a space layer, L × M space-frequency combining coefficients are counted, and a bitmap (bitmap) with L × M bits can be used to indicate the space-domain basis vectors and the frequency-domain basis vectors corresponding to the reported space-frequency combining coefficients. And the L M bits correspond to the L M space-frequency merging coefficients one by one. Usually, the ith bit in a bitmap (bitmap) takes a value of 1, which indicates that the ith space-frequency combining coefficient in the L × M space-frequency combining coefficients needs to be reported. Otherwise, the ith bit in the bitmap (bitmap) takes a value of 0, which indicates that the ith space-frequency combining coefficient in the L × M space-frequency combining coefficients cannot be reported, i.e., the combining coefficient is 0.

With reference to the ninth aspect or the tenth aspect, in some possible implementations, the CSI report further includes at least two bitmaps associated with the second spatial layer; wherein at least one of the at least two bit patterns associated with the second spatial layer is associated with a first polarization direction, another bit pattern is associated with a second polarization direction, and at least 1 bit value in the bit pattern associated with the first polarization direction is 1 and at least 1 bit value in the bit pattern associated with the second polarization direction is 1.

With reference to the ninth aspect or the tenth aspect, in some possible implementations, at least one of the bit patterns associated with the same spatial layer direction is associated with a first polarization direction, and another bit pattern is associated with a second polarization direction; and at least a 1-bit value in the bitmap associated with the first polarization direction is 1 and at least a 1-bit value in the bitmap associated with the second polarization direction is 1.

Based on the above design, the CSI part2 includes a bitmap indicating a reported merging coefficient position corresponding to each spatial layer, where at least one bit value in the bitmap corresponding to each polarization direction is 1. And at least one space-frequency merging coefficient exists in each of the 2 polarization directions for reporting. The situation that one polarization direction of elements in the precoding matrix is all 0 is avoided, and therefore verification loss of system performance caused by the extreme implementation method of the terminal equipment is avoided.

In an eleventh aspect, a communication method is provided, which may be performed by a terminal device, or may be performed by a chip provided in the terminal device.

Specifically, the method comprises the following steps: generating a CSI report, the CSI report comprising a plurality of bitmaps; each bitmap being associated with a spatial layer; the number of bitmaps associated with the same spatial layer is at least 2; and at least one of the bitmaps associated with the same spatial layer is associated with a first polarization direction and another bitmap is associated with a second polarization direction; and at least 1 bit value in the bitmap associated with the first polarization direction is 1, and at least 1 bit value in the bitmap associated with the second polarization direction is 1; and sending the CSI report.

In a twelfth aspect, a communication method is provided, which may be performed by a network device, or may be performed by a chip configured in the network device.

Specifically, the method comprises the following steps: receiving a CSI report, the CSI report comprising a plurality of bitmaps; each bitmap being associated with a spatial layer; the number of bitmaps associated with the same spatial layer is at least 2; and at least one of the bitmaps associated with the same spatial layer is associated with a first polarization direction and another bitmap is associated with a second polarization direction; and at least 1 bit value in the bitmap associated with the first polarization direction is 1, and at least 1 bit value in the bitmap associated with the second polarization direction is 1; and determining a precoding matrix according to the CSI report.

In a thirteenth aspect, there is provided a communication device comprising means for performing the method of any one of the possible implementations of the first, third, fifth, seventh, ninth or eleventh aspect and the first, third, fifth, seventh, ninth or eleventh aspect.

In a fourteenth aspect, a communications apparatus is provided that includes a processor. The processor is coupled to the memory and is operable to execute instructions in the memory to implement the method of any one of the possible implementations of the first, third, fifth, seventh, ninth, or eleventh aspect described above and the first, third, fifth, seventh, ninth, or eleventh aspect. Optionally, the communication device further comprises a memory. Optionally, the communication device further comprises a communication interface, the processor being coupled to the communication interface.

In one implementation, the communication device is a terminal device. When the communication device is a terminal device, the communication interface may be a transceiver, or an input/output interface.

In another implementation, the communication device is a chip configured in the terminal equipment. When the communication device is a chip configured in a terminal device, the communication interface may be an input/output interface.

Alternatively, the transceiver may be a transmit-receive circuit. Alternatively, the input/output interface may be an input/output circuit.

In a fifteenth aspect, a communications device is provided that includes means for performing the method of the second, fourth, or sixth aspect, and any possible implementation manner of the second, fourth, or sixth aspect.

In a sixteenth aspect, a communications apparatus is provided that includes a processor. The processor is coupled to the memory and is operable to execute the instructions in the memory to implement the method of any of the possible implementations of the second, fourth, sixth, eighth, tenth or twelfth aspects described above and the second, fourth, sixth, eighth, tenth or twelfth aspects. Optionally, the communication device further comprises a memory. Optionally, the communication device further comprises a communication interface, the processor being coupled to the communication interface.

In one implementation, the communication device is a network device. When the communication device is a network device, the communication interface may be a transceiver, or an input/output interface.

In another implementation, the communication device is a chip configured in the network device. When the communication means is a chip configured in a network device, the communication interface may be an input/output interface.

In a seventeenth aspect, a processor is provided, including: input circuit, output circuit and processing circuit. The processing circuit is configured to receive a signal through the input circuit and transmit a signal through the output circuit, so that the processor performs the method of any one of the possible implementations of the first to twelfth aspects and the first to twelfth aspects.

In a specific implementation process, the processor may be a chip, the input circuit may be an input pin, the output circuit may be an output pin, and the processing circuit may be a transistor, a gate circuit, a flip-flop, various logic circuits, and the like. The input signal received by the input circuit may be received and input by, for example and without limitation, a receiver, the signal output by the output circuit may be output to and transmitted by a transmitter, for example and without limitation, and the input circuit and the output circuit may be the same circuit that functions as the input circuit and the output circuit, respectively, at different times. The embodiment of the present application does not limit the specific implementation manner of the processor and various circuits.

In an eighteenth aspect, a processing apparatus is provided that includes a processor and a memory. The processor is configured to read instructions stored in the memory, and may receive a signal via the receiver and transmit a signal via the transmitter to perform the method of any one of the possible implementations of the first aspect to the twelfth aspect and the first aspect to the twelfth aspect.

Optionally, the number of the processors is one or more, and the number of the memories is one or more.

Alternatively, the memory may be integral to the processor or separate from the processor.

In a specific implementation process, the memory may be a non-transient memory, such as a Read Only Memory (ROM), which may be integrated on the same chip as the processor, or may be separately disposed on different chips, and the embodiment of the present application does not limit the type of the memory and the arrangement manner of the memory and the processor.

It will be appreciated that the associated data interaction process, for example, sending the indication information, may be a process of outputting the indication information from the processor, and receiving the capability information may be a process of receiving the input capability information from the processor. In particular, data output by the processor may be output to the transmitter and input data received by the processor may be from the receiver. The transmitter and receiver may be collectively referred to as a transceiver, among others.

The processing device in the eighteenth aspect may be a chip, the processor may be implemented by hardware or software, and when implemented by hardware, the processor may be a logic circuit, an integrated circuit, or the like; when implemented in software, the processor may be a general-purpose processor implemented by reading software code stored in a memory, which may be integrated with the processor, located external to the processor, or stand-alone.

In a nineteenth aspect, there is provided a computer program product, the computer program product comprising: a computer program (which may also be referred to as code, or instructions), which when executed, causes a computer to perform the method of any one of the possible implementations of the first to twelfth aspects and of the first to twelfth aspects described above.

A twentieth aspect provides a computer-readable medium storing a computer program (which may also be referred to as code or instructions) which, when run on a computer, causes the computer to perform the method of any one of the possible implementations of the first to sixth aspects and of the first to twelfth aspects described above.

In a twenty-first aspect, a communication system is provided, which includes the foregoing network device and terminal device.

Drawings

Fig. 1 is a schematic diagram of a communication system suitable for use in a method of indicating CSI in an embodiment of the present application.

Fig. 2 is a schematic flow chart of a method for indicating CSI provided in an embodiment of the present application.

Fig. 3 shows a schematic diagram of the strongest amplitude and the quantization reference amplitude of all reported space-frequency combination coefficients corresponding to each spatial layer when the maximum spatial layer is 4 according to the embodiment of the present application.

Fig. 4 is another schematic flow chart of a method for indicating CSI provided in an embodiment of the present application.

Fig. 5 is another schematic flow chart of a method for indicating CSI provided in an embodiment of the present application.

Fig. 6 is another schematic flow chart of a method for indicating CSI provided in an embodiment of the present application.

Fig. 7 is a schematic diagram of all reported space-frequency combining coefficients corresponding to each spatial layer when the maximum spatial layer provided by the embodiment of the present application is 1.

Fig. 8 is a schematic block diagram of a communication device provided in an embodiment of the present application.

Fig. 9 is a schematic structural diagram of a terminal device provided in an embodiment of the present application.

Fig. 10 is a schematic structural diagram of a network device according to an embodiment of the present application.

Detailed Description

The technical solution in the present application will be described below with reference to the accompanying drawings.

The technical scheme of the embodiment of the application can be applied to various communication systems, for example: a global system for mobile communications (GSM) system, a Code Division Multiple Access (CDMA) system, a Wideband Code Division Multiple Access (WCDMA) system, a General Packet Radio Service (GPRS), a long term evolution (long term evolution, LTE) system, a LTE Frequency Division Duplex (FDD) system, a LTE Time Division Duplex (TDD) system, a universal mobile telecommunications system (universal mobile telecommunications system, UMTS), a Worldwide Interoperability for Microwave Access (WiMAX) communication system, a future fifth generation (5G) system, or a new radio NR (UMTS) system, etc.

For the convenience of understanding the embodiments of the present application, a communication system applicable to the embodiments of the present application will be first described in detail by taking the communication system shown in fig. 1 as an example. Fig. 1 is a schematic diagram of a communication system 100 suitable for use in a method of indicating CSI in an embodiment of the present application. As shown in fig. 1, the communication system 100 may include at least one network device, such as the network device 110 shown in fig. 1; the communication system 100 may also include at least one terminal device, such as the terminal device 120 shown in fig. 1. Network device 110 and terminal device 120 may communicate via a wireless link. Each communication device, such as network device 110 or terminal device 120, may be configured with multiple antennas. For each communication device in the communication system 100, the configured plurality of antennas may include at least one transmit antenna for transmitting signals and at least one receive antenna for receiving signals. Accordingly, communication between communication devices in the communication system 100, such as between the network device 110 and the terminal device 120, may be via multiple antenna techniques.

It should be understood that the network device in the communication system may be any device having a wireless transceiving function. The network devices include, but are not limited to: evolved Node B (eNB), Radio Network Controller (RNC), Node B (NB), Base Station Controller (BSC), Base Transceiver Station (BTS), home base station (e.g., home evolved Node B, or home Node B, HNB), baseband unit (BBU), Access Point (AP) in wireless fidelity (WiFi) system, wireless relay Node, wireless backhaul Node, Transmission Point (TP), or Transmission and Reception Point (TRP), etc., and may also be 5G, such as NR, a gbb in the system, or a transmission point (TRP or TP), where one or more of the base stations in the 5G system may include one or more antennas (e.g., NB, and may also constitute a panel of the network, such as a baseband unit (BBU), or a Distributed Unit (DU), etc.

In some deployments, the gNB may include a Centralized Unit (CU) and a DU. The gNB may also include a Radio Unit (RU). The CU implements part of the function of the gNB and the DU implements part of the function of the gNB. For example, a CU implements functions of a Radio Resource Control (RRC) layer and a Packet Data Convergence Protocol (PDCP) layer, and a DU implements functions of a Radio Link Control (RLC), a Medium Access Control (MAC) layer and a Physical (PHY) layer. Since the information of the RRC layer eventually becomes or is converted from the information of the PHY layer, the higher layer signaling, such as RRC layer signaling, may also be considered as being transmitted by the DU or DU + CU under this architecture. It is to be understood that the network device may be a CU node, or a DU node, or a device including a CU node and a DU node. In addition, the CU may be divided into network devices in a Radio Access Network (RAN), or may be divided into network devices in a Core Network (CN), which is not limited in this application.

It should also be understood that terminal equipment in the wireless communication system may also be referred to as User Equipment (UE), an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent, or a user equipment. The terminal device in the embodiment of the present application may be a mobile phone (mobile phone), a tablet (pad), a computer with a wireless transceiving function, a Virtual Reality (VR) terminal device, an Augmented Reality (AR) terminal device, a wireless terminal in industrial control (industrial control), a wireless terminal in self driving (self driving), a wireless terminal in remote medical (remote), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation safety (transportation safety), a wireless terminal in smart city (smart city), a wireless terminal in smart home (smart home), and the like. The embodiments of the present application do not limit the application scenarios.

It should also be understood that fig. 1 is a simplified schematic diagram that is merely illustrated for ease of understanding, and that other network devices or other terminal devices, which are not shown in fig. 1, may also be included in the communication system 100.

In order to facilitate understanding of the embodiments of the present application, the following is a brief description of the processing procedure of the downlink signal at the physical layer before transmission. It should be understood that the processing of the downstream signal described below may be performed by the network device, or may be performed by a chip configured in the network device. For convenience of description, hereinafter, collectively referred to as network devices.

The network device may process a codeword (code word) on a physical channel. Where the codeword may be coded bits that are encoded (e.g., including channel coding). The codeword is scrambled (scrambling) to generate scrambled bits. The scrambled bits are modulation mapped (modulation mapping) to obtain modulation symbols. The modulation symbols are mapped to a plurality of layers (layers), or spatial layers, through layer mapping. The modulated symbols after layer mapping are precoded (precoding) to obtain precoded signals. The precoded signal is mapped to a plurality of Resource Elements (REs) after mapping the signal to the REs. These REs are then modulated by orthogonal multiplexing (OFDM) and transmitted through an antenna port (antenna port).

It should be understood that the above-described processing procedure for the downlink signal is only an exemplary description, and should not limit the present application in any way. For the processing procedure of the downlink signal, reference may be made to the prior art, and a detailed description of the specific procedure is omitted here for brevity.

In order to facilitate understanding of the embodiments of the present application, the following description is briefly made of terms related to the embodiments of the present application.

1. The precoding technology comprises the following steps: the network device can process the signal to be transmitted by means of the precoding matrix matched with the channel resource under the condition of the known channel state, so that the signal to be transmitted after precoding is matched with the channel, and the complexity of eliminating the influence between the channels by the receiving device is reduced. Therefore, by precoding the signal to be transmitted, the received signal quality (e.g., signal to interference plus noise ratio (SINR)) is improved. Therefore, by using the precoding technology, the transmission of the transmitting device and the multiple receiving devices on the same time-frequency resource can be realized, that is, multi-user multiple input multiple output (MU-MIMO) is realized. It should be noted that the related description regarding the precoding technique is merely exemplary for ease of understanding and is not intended to limit the scope of the embodiments of the present application. In a specific implementation process, the sending device may also perform precoding in other manners. For example, when the channel information (for example, but not limited to, the channel matrix) cannot be obtained, precoding is performed using a preset precoding matrix or a weighting processing method. For brevity, the detailed contents thereof are not described herein again.

2. Precoding Matrix Indicator (PMI): may be used to indicate the precoding matrix. The precoding matrix may be, for example, a precoding matrix determined by the terminal device based on a channel matrix of each frequency domain unit (e.g., the frequency domain length of one frequency domain unit may be a subband, or R times the frequency domain subband, where R < ═ 1, and the value of R may be 1 or 1/2, or RB). The channel matrix may be determined by the terminal device through channel estimation or the like or based on channel reciprocity. However, it should be understood that the specific method for determining the precoding matrix by the terminal device is not limited to the foregoing, and the specific implementation manner may refer to the prior art, which is not listed here for brevity.

For example, the precoding matrix may be obtained by performing Singular Value Decomposition (SVD) on the channel matrix or a covariance matrix of the channel matrix, or may be obtained by performing eigenvalue decomposition (EVD) on the covariance matrix of the channel matrix. It should be understood that the determination manner of the precoding matrix listed above is only an example, and should not constitute any limitation to the present application. The determination of the precoding matrix can be made by referring to the prior art, and for the sake of brevity, it is not listed here.

It should be noted that, with the method provided in the embodiment of the present application, the network device may determine, based on the feedback of the terminal device, a spatial vector, a frequency domain vector, and a combining coefficient of a spatial-frequency vector pair for constructing a precoding vector, and further determine a precoding matrix corresponding to each frequency domain unit. The precoding matrix can be directly used for downlink data transmission; the precoding matrix finally used for downlink data transmission may also be obtained through some beamforming methods, for example, including zero-forcing (ZF), regularized zero-forcing (RZF), minimum mean-squared error (MMSE), signal-to-leakage-noise-and-noise (SLNR), and the like. This is not a limitation of the present application. Unless otherwise specified, the precoding matrices referred to hereinafter may refer to precoding matrices determined based on the methods provided herein.

It can be understood that the precoding matrix determined by the terminal device can be understood as the precoding matrix to be fed back. The terminal device may indicate the precoding matrix to be fed back through the PMI, so that the network device recovers the precoding matrix based on the PMI. It is understood that the precoding matrix recovered by the network device based on the PMI may be the same as or similar to the precoding matrix to be fed back.

In the downlink channel measurement, the higher the approximation degree of the precoding matrix determined by the network device according to the PMI and the precoding matrix determined by the terminal device is, the more the determined precoding matrix for data transmission can be adapted to the channel state, and therefore, the reception quality of signals can be improved.

3. Precoding vector: a precoding matrix may comprise one or more vectors, such as column vectors. One precoding matrix may be used to determine one or more precoding vectors.

When the number of spatial layers is 1 and the number of polarization directions of the transmit antennas is also 1, the precoding matrix is a precoding vector. When the number of spatial layers is multiple and the number of polarization directions of the transmit antennas is 1, the precoding vector may refer to a component of the precoding matrix on one spatial layer. When the number of spatial layers is 1 and the number of polarization directions of the transmit antennas is plural, the precoding vector may refer to a component of the precoding matrix in one polarization direction. When the number of spatial layers is multiple and the number of polarization directions of the transmit antennas is also multiple, the precoding vector may refer to a component of the precoding matrix in one spatial layer and one polarization direction.

It should be understood that the precoding vector may also be determined from the vector in the precoding matrix, e.g., by mathematically transforming the vector in the precoding matrix. The mathematical transformation relation between the precoding matrix and the precoding vector is not limited in the present application.

4. Antenna port: may be referred to simply as a port. It is understood as a transmitting antenna recognized by the receiving device, or a transmitting antenna that is spatially distinguishable. One antenna port may be preconfigured for each virtual antenna, each virtual antenna may be a weighted combination of multiple physical antennas, and each antenna port may correspond to one reference signal, and thus, each antenna port may be referred to as a port of one reference signal, for example, a CSI-RS port, a Sounding Reference Signal (SRS) port, and the like. In the embodiment of the present application, the antenna port may refer to a transceiver unit (TxRU).

5. Spatial domain vector (spatial domain vector): or a beam vector, a spatial beam basis vector or a spatial basis vector. Each element in the spatial vector may represent a weight of each antenna port. Based on the weight of each antenna port represented by each element in the space domain vector, signals of each antenna port are linearly superposed, and a region with stronger signals can be formed in a certain direction of the space.

The length of the space vector may be the number of transmit antenna ports N in one polarization direction_s，N_sIs more than or equal to 1 and is an integer. The space vector may be, for example, of length N_sA column vector or a row vector. This is not a limitation of the present application.

Alternatively, the spatial vector is taken from a Discrete Fourier Transform (DFT) matrix. Each column vector in the DFT matrix may be referred to as a DFT vector. In other words, the spatial vector may be a DFT vector. The spatial vector may be, for example, a DFT vector defined in a type ii (typeii) codebook of the NR protocol TS38.214 version 15(release 15, R15).

6. Spatial vector set: a number of different length space-domain vectors may be included to correspond to different numbers of antenna ports. In the embodiment of the present application, the length of the space vector is N_sTherefore, the length of each space domain vector in the space domain vector set to which the space domain vector belongs reported by the terminal device is N_s。

In one possible design, the set of spatial vectors may include N_sA space vector of N_sThe space-domain vectors can be orthogonal to each other two by two. Each spatial vector in the set of spatial vectors can be takenFrom a two-dimensional (2dimension, 2D) -DFT matrix. Wherein 2D may represent two different directions, e.g., a horizontal direction and a vertical direction. If the number of antenna ports in the horizontal direction and the vertical direction is N respectively₁And N₂Then N_s＝N₁N₂。

The N is_sA spatial vector can be written, for example

The N is_sThe space vector can construct a matrix U_s，

If each space vector in the set of space vectors is taken from a 2D-DFT matrix, then

Wherein D_NAn orthogonal DFT matrix of N × N, with the element of the m-th row and N-th column being

In another possible design, the set of spatial vectors may be passed through an oversampling factor O_sExpansion to O_s×N_sA spatial vector. In this case, the set of spatial vectors may include O_sA plurality of subsets, each subset may include N_sA respective empty-field vector. N in each subset_sThe space-domain vectors can be orthogonal to each other two by two. Each spatial vector in the set of spatial vectors may be taken from an oversampled 2D-DFT matrix. Wherein the oversampling factor O_sIs a positive integer. Specifically, O_s＝O₁×O₂，O₁May be an oversampling factor in the horizontal direction, O₂May be an oversampling factor in the vertical direction. O is₁≥1，O₂≥ 1，O₁、O₂Are not 1 at the same time and are integers.

The set of spatial vectorsO of (1)_s(0≤o_s≤O_s-1 and o_sIs an integer) of subsets_sThe spatial vectors can be respectively written as

Based on the o_sN of the subset_sThe space vector can construct a matrix

7. Frequency domain unit: the unit of the frequency domain resource can represent different frequency domain resource granularities. The frequency domain units may include, but are not limited to, subbands (subbands), Resource Blocks (RBs), subcarriers, Resource Block Groups (RBGs), precoding resource block groups (PRGs), and so on. In addition, the frequency domain length of one frequency domain unit may also be R times of the CQI subband, R < ═ 1, and R may take a value of 1 or 1/2, or the frequency domain length of one frequency domain unit may also be RB.

In this embodiment, the precoding matrix corresponding to a frequency domain unit may refer to a precoding matrix determined by performing channel measurement and feedback based on a reference signal on the frequency domain unit. The precoding matrix corresponding to the frequency domain unit may be used to precode data for subsequent transmission through the frequency domain unit. Hereinafter, the precoding matrix or precoding vector corresponding to a frequency domain element may also be simply referred to as the precoding matrix or precoding vector of the frequency domain element.

8. Frequency domain vector (frequency domain vector): a vector that can be used to represent the law of variation of the channel in the frequency domain. Each frequency domain vector may represent a law of variation. Since the signal may travel multiple paths from the transmit antenna to the receive antenna as it travels through the wireless channel. Multipath delay causes frequency selective fading, which is a change in the frequency domain channel. Therefore, the variation law of the channel in the frequency domain caused by the time delay on different transmission paths can be represented by different frequency domain vectors.

The length of the frequency domain vector may be determined by the number of frequency domain units to be reported preconfigured in the reporting bandwidth, may also be determined by the length of the reporting bandwidth, and may also be a protocol predefined value. The length of the frequency domain vector is not limited in the present application. The reporting bandwidth may refer to, for example, a CSI reporting bandwidth (CSI-reporting band) carried in a CSI reporting preconfigured message in a higher layer signaling (e.g., Radio Resource Control (RRC) message).

Frequency domain vector u_fCan be recorded as N_f，N_fIs a positive integer. The frequency domain vector may be, for example, of length N_fA column vector or a row vector. This is not a limitation of the present application.

9. Frequency domain vector set: frequency domain vectors of a variety of different lengths may be included. In the embodiment of the present application, the length of the frequency domain vector is N_fTherefore, the length of each frequency domain vector in the frequency domain vector set to which the frequency domain vector belongs reported by the terminal device is N_f。

In one possible design, the set of frequency domain vectors may include N_fA frequency domain vector. The N is_fThe frequency domain vectors can be orthogonal to each other two by two. Each frequency domain vector in the set of frequency domain vectors may be taken from a DFT matrix or an IDFT matrix (i.e., the conjugate transpose of the DFT matrix).

The N is_fA frequency domain vector can be written, for example

The N is_fThe matrix U can be constructed by the frequency domain vectors_f，

In another possible design, the set of frequency domain vectors may be passed through an oversampling factor O_fExpansion to O_f×N_fA frequency domain vector. In this case, the set of frequency domain vectors may include O_fA plurality of subsets, each subset may include N_fA frequency domain vector. N in each subset_fThe frequency domain vectors can be orthogonal to each other two by two. The set of frequency domain vectorsMay be taken from the oversampled DFT matrix or the conjugate transpose of the oversampled DFT matrix. Wherein the oversampling factor O_fIs a positive integer.

O < th > in the set of frequency domain vectors_f(0≤o_f≤O_f-1 and o_sIs an integer) of subsets_fThe frequency domain vectors can be respectively recorded as

Based on the o_fN of the subset_sThe beam vectors can form a matrix

Thus, each frequency domain vector in the set of frequency domain vectors may be taken from a DFT matrix or an oversampled DFT matrix, or from a conjugate transpose of a DFT matrix or a conjugate transpose of an oversampled DFT matrix. Each column vector in the set of frequency domain vectors may be referred to as a DFT vector or an oversampled DFT vector. In other words, the frequency domain vector may be a DFT vector or an oversampled DFT vector. 10. Space-frequency precoding matrix: in this embodiment of the application, the space-frequency precoding matrix may be understood as a matrix combined by precoding matrices corresponding to each frequency domain unit (matrix splicing is performed on the precoding matrix corresponding to each frequency domain unit), and is used to determine an intermediate quantity of the precoding matrix corresponding to each frequency domain unit. For the terminal device, the space-frequency precoding matrix may be determined by a precoding matrix or a channel matrix corresponding to each frequency domain unit. For example, the space-frequency precoding matrix may be denoted as H,

wherein, w₁To

Is and N_fN corresponding to each frequency domain unit_fEach column vector may be a target precoding matrix corresponding to each frequency domain unit, and the length of each column vector may be N_s. The N is_fEach column vector corresponds to N_fTarget precoding vectors for individual frequency domain units. I.e. the space-frequency matrix can be regarded as N_fAnd combining the target precoding vectors corresponding to the frequency domain units to form a joint matrix.

11. And (3) double-domain compression: compression in both dimensions may include spatial and frequency domain compression. Spatial compression may particularly refer to the selection of one or more spatial vectors from a set of spatial vectors as vectors for constructing a precoding vector. Frequency domain compression may refer to the selection of one or more frequency domain vectors in a set of frequency domain vectors as vectors for constructing a precoding vector. The matrix constructed by one spatial vector and one frequency domain vector may be referred to as a space-frequency component matrix, for example. The selected one or more spatial vectors and one or more frequency domain vectors may construct one or more matrices of space-frequency components. The weighted sum of the one or more spatial-frequency component matrices may be used to construct a spatial-frequency precoding matrix corresponding to a spatial layer. In other words, the space-frequency pre-coding matrix may be approximated as a weighted sum of the space-frequency component matrices constructed by the selected one or more space-frequency vectors and one or more frequency-domain vectors described above. Based on a space-frequency precoding matrix corresponding to a space layer, a precoding vector corresponding to each frequency domain unit on the space layer can be further determined.

In particular, the selected one or more spatial vectors may form a spatial beam basis matrix W₁Wherein W is₁Each corresponding to a selected one of the spatial vectors. The selected one or more frequency domain vectors may form a frequency domain basis matrix W₃Wherein W is₃Each corresponding to a selected one of the frequency domain vectors. The space-frequency precoding matrix H may be represented as a result of a linear combination of the selected one or more space-domain vectors and the selected one or more frequency-domain vectors,

in one implementation, if dual polarization directions are used, L space vectors, W, are selected for each polarization direction₁Has a dimension of 2N_s× 2L in one possible implementation, the two polarization directions use the same L space vectors

At this time, W₁Can be expressed as

Wherein

Represents the selected ith space vector, i ═ 0,1, …, L-1.

For example, for a spatial layer, if each spatial vector selects the same M frequency domain vectors, then

Dimension of M × N_f，W₃Each column vector corresponds to a frequency domain vector, and the frequency domain vector corresponding to each space domain vector is W at the moment₃M frequency domain vectors.

The dimension is 2L × M for the space-frequency merging coefficient matrix.

Space-frequency merging coefficient matrix

The ith row in (b) corresponds to the ith space vector in 2L space vectors and a space-frequency merging coefficient matrix

The jth column in (a) corresponds to the jth frequency-domain basis vector in the M frequency-domain basis vectors. The space-frequency merging coefficient vector corresponding to the ith space-frequency vector is a space-frequency merging coefficient matrix

The ith row vector of (1), the space frequency corresponding to the ith space vectorThe combining coefficient is a space-frequency combining coefficient matrix

The element contained in the ith row vector of (a).

Each of the L spatial vectors may correspond to a different frequency-domain basis vector. At this time, the process of the present invention,

wherein

M corresponding to the ith space vector_iM formed by frequency domain vectors_iLine N_fA matrix of columns.

Wherein

Is that the dimension corresponding to the ith space vector is 1 × M_iThe space-frequency combination coefficient matrix of (a),

the space-frequency merging coefficient contained in the vector number is the space-frequency merging coefficient corresponding to the ith space vector.

In addition, the space-frequency matrix V can also be expressed as

At this time W₃Each row vector of (a) corresponds to a selected one of the frequency domain vectors.

Since the dual-domain compression is performed in both spatial and frequency domains, the terminal device may feed back the selected one or more spatial vectors and one or more frequency-domain vectors to the network device during feedback, instead of feeding back the combining coefficients (e.g., including amplitude and phase) of the sub-bands separately on a per frequency-domain unit (e.g., sub-band) basis. Thus, feedback overhead can be greatly reduced. Meanwhile, since the frequency domain vector can represent the change rule of the channel in frequency, the change of the channel in frequency domain is simulated by linear superposition of one or more frequency domain vectors. Therefore, higher feedback accuracy can still be maintained, so that the precoding matrix recovered by the network device based on the feedback of the terminal device can still be well adapted to the channel.

12. Space-frequency combining coefficient, amplitude and phase: the space-frequency combining coefficient is also called a combining coefficient, and is used for representing the weight of a vector pair formed by a space domain vector and a frequency domain vector for constructing the space-frequency precoding matrix. As described above, the space-frequency combining coefficients have a one-to-one correspondence relationship with a vector pair of a space-domain vector and a frequency-domain vector, or each space-frequency combining coefficient corresponds to a space-domain vector and a frequency-domain vector. In particular, the space-frequency merging coefficient matrix

And the element in the ith row and the jth column in the middle is a merging coefficient corresponding to a vector pair formed by the ith space vector and the jth frequency domain vector.

In one implementation, to control the reporting overhead, the terminal device may only report the space-frequency merging coefficient matrix

A subset of the 2LM merging coefficients contained in (a). Specifically, the network device may configure the maximum number K of space-frequency combining coefficients that can be reported by the terminal device corresponding to each spatial layer₀In which K is₀<＝2LM。K₀And

the total number of merging coefficients 2LM contained in the system can be in a proportional relationship, for example K₀The value of β "&gttttβ &ttt/t &gtt = β · 2LM, &ltttttranslation = may be {3/4,1/2,1/4}₁A space-frequency combination coefficient of amplitude other than 0, and K₁<＝K₀。

Each space-frequency combinationThe coefficients may include amplitude and phase. For example, space-frequency merging coefficients ae^jθWhere a is the amplitude and θ is the phase.

In one implementation, for reported K₁The amplitude values and phase values of the space-frequency combining coefficients can be quantized independently. Wherein the quantization method for the amplitude comprises the steps of:

1) for K₁A merging coefficient with the largest amplitude value as reference for K₁Normalizing the merging coefficients, if the ith merging coefficient is c before normalization_iIs then c 'after normalization'_i＝c_i/c_iA 1, c_iAnd the merging coefficient with the maximum amplitude value. After normalization, the merging coefficient with the largest amplitude value is 1.

2) The terminal device reports the index i of the combining coefficient with the maximum amplitude value, and the indication information indicating the index of the combining coefficient with the maximum amplitude value may include

A bit.

3) For the polarization direction in which the combining coefficient with the largest amplitude value is located, the quantization reference amplitude is 1. For another polarization direction, the magnitude of the combining coefficient with the largest magnitude in the polarization direction can be used as the quantized reference magnitude of the polarization direction. Quantizing the quantized reference amplitude by 4 bits and reporting, wherein the quantized candidate amplitude value comprises

4) For each polarization direction, respectively taking the quantization reference amplitude corresponding to the polarization direction as a reference, and performing 3-bit quantization on the differential amplitude value of each combination coefficient, wherein the quantization candidate amplitude value comprises

The difference amplitude value represents a difference value with respect to the quantization reference amplitude corresponding to the polarization direction, and if the quantization reference amplitude corresponding to the polarization direction where a combining coefficient is located is A, the combining coefficient is used for combiningAnd if the differential amplitude value after the coefficient quantization is B, the amplitude value after the coefficient quantization is A B.

5) The phase of each normalized combined coefficient is quantized by 3 bits (8PSK) or 4 bits (16 PSK).

Among the plurality of space-frequency combining coefficients corresponding to the plurality of space-frequency component matrices, the amplitude (or amplitude) of some of the space-frequency combining coefficients may be zero or close to zero, and the corresponding quantization value may be zero. The space-frequency combining coefficient whose amplitude is quantized by the quantization value zero may be referred to as a space-frequency combining coefficient whose amplitude is zero. Correspondingly, the magnitude of some space-frequency combination coefficients is larger, and the corresponding quantization values are not zero. The space-frequency combining coefficient whose amplitude is quantized by the non-zero quantization value may be referred to as a space-frequency combining coefficient whose amplitude is non-zero. In other words, the plurality of space-frequency combining coefficients consists of one or more non-zero amplitude space-frequency combining coefficients and one or more zero amplitude space-frequency combining coefficients.

It should be understood that the space-frequency combining coefficient may be indicated by a quantized value, may also be indicated by an index of a quantized value, or may also be indicated by a non-quantized value, and the present application does not limit the indicating manner of the space-frequency combining coefficient, as long as an opposite end is allowed to know the space-frequency combining coefficient. Hereinafter, for convenience of explanation, information indicating the space-frequency combining coefficient is referred to as quantization information of the space-frequency combining coefficient. The quantization information may be, for example, a quantization value, an index, or any other information that may be used to indicate the space-frequency combining coefficients.

12. Spatial layer (layer): in MIMO, one spatial layer can be seen as one independently transmittable data stream. In order to improve the utilization rate of spectrum resources and improve the data transmission capability of the communication system, the network device may transmit data to the terminal device through a plurality of spatial layers.

The number of spatial layers is the rank of the channel matrix. The terminal device may determine the number of spatial layers according to a channel matrix obtained by channel estimation. A precoding matrix may be determined from the channel matrix. For example, the precoding matrix may be determined by SVD on a channel matrix or a covariance matrix of the channel matrix. In the SVD process, different spatial layers may be distinguished according to the size of the eigenvalues. For example, a precoding vector determined by a feature vector corresponding to the largest feature value may be associated with the 1 st spatial layer, and a precoding vector determined by a feature vector corresponding to the smallest feature value may be associated with the R-th spatial layer. That is, the eigenvalues corresponding to the 1 st to R-th spatial layers decrease in order. In brief, the intensity of the 1 st spatial layer to the R th spatial layer in the R spatial layers decreases sequentially.

It should be understood that distinguishing different spatial layers based on feature values is only one possible implementation and should not constitute any limitation to the present application. For example, the protocol may also define other criteria for distinguishing spatial layers in advance, which is not limited in this application.

13. Channel State Information (CSI) report (report): in a wireless communication system, information describing channel properties of a communication link is reported by a receiving end (e.g., a terminal device) to a transmitting end (e.g., a network device). The CSI report may include, but is not limited to, a Precoding Matrix Indicator (PMI), a Rank Indicator (RI), a Channel Quality Indicator (CQI), a channel state information reference signal (CSI-RS resource indicator (CRI)), and a Layer Indicator (LI), etc. it should be understood that the specific contents of the CSI listed above are merely exemplary and should not constitute any limitation to the present application.

Take the example that the terminal device reports the CSI to the network device.

The terminal device may report one or more CSI reports in a time unit (e.g., a slot), where each CSI report may correspond to a configuration condition for CSI reporting. The configuration condition for CSI reporting may be determined by CSI reporting configuration (CSI reporting setting), for example. The CSI reporting configuration may be used to indicate a time domain behavior, a bandwidth, a format corresponding to a report quality (report quality), and the like of CSI reporting. The time domain behavior includes, for example, periodicity (periodic), semi-persistence (semi-persistent), and aperiodicity (aperiodic). The terminal device may generate one CSI report based on one CSI reporting configuration.

Reporting one or more CSI reports by a terminal device within one time unit may be referred to as one-time CSI reporting.

In the embodiment of the present application, when generating the CSI report, the terminal device may divide the content in the CSI report into two parts. For example, the CSI report may include a first portion and a second portion. The first portion and the second portion may be independently encoded. Wherein the payload size (size) of the first portion may be predefined, and the payload size of the second portion may be determined according to the information carried in the first portion.

The network device may decode the first portion according to a predefined payload size of the first portion to obtain the information carried in the first portion. The network device may determine the payload size of the second portion based on the information obtained from the first portion, and then decode the second portion to obtain the information carried in the second portion.

It is to be understood that the first and second parts are similar to part 1(part 1) and part 2(part 2) of CSI as defined in the NR protocol TS38.214 version 15(release 15, R15).

It should also be understood that, since the embodiments of the present application mainly relate to reporting of PMI and reporting of RI, the following embodiments may include related information such as PMI and RI in the first and second parts of CSI report, and do not relate to others. It should be understood that this should not constitute any limitation to the present application. In addition to the information contained or indicated by the first and second portions of the CSI report listed in the embodiments below, the first portion of the CSI report may also include one or more of CQI and LI, or may also include other information that may predefine the feedback overhead, as well as the second portion of the CSI report. This is not a limitation of the present application.

Since part 1 in the current CSI report includes RI, CQI and the number of space base vectors with wideband amplitude different from 0, this design is not suitable for the feedback mode of two-domain compression. In the feedback mode of dual-domain compression, the terminal device needs to indicate the selected frequency domain vector and the merging coefficient corresponding to the space-frequency component matrix through the PMI, but since the network device cannot predict how many merging coefficients the terminal device will report in advance, the payload size of part2 cannot be estimated, and thus the information in part2 cannot be correctly decoded. This may seriously affect the data transmission performance.

Based on this, the present application provides a method, through the design of the first part of the CSI report, so that the network device can decode the first part according to the fixed payload size, and further estimate the payload size of the second part, thereby implementing correct decoding of the second part.

Before describing the embodiments of the present application, the following description will be made first.

First, for the convenience of understanding and explanation, the main parameters involved in the present application are first described as follows:

r: predefined maximum number of spatial layers

Q: number of spatial layers indicated in RI

L: number of space-domain basis vectors in each spatial layer

M: number of frequency domain basis vectors in each spatial layer

Second, in the present embodiment, for convenience of description, when referring to numbering, numbering may be continued from 1. For example, the R spatial layers may include 1 st spatial layer to R th spatial layer, the L beam vectors may include 1 st beam vector to L th beam vector, and so on, which are not illustrated one by one here. Of course, the specific implementation is not limited to this, and for example, the numbers may be continuously numbered from 0. It should be understood that the above-mentioned descriptions are provided for convenience of describing the technical solutions provided by the embodiments of the present application, and are not intended to limit the scope of the present application.

Third, in the embodiments of the present application, a plurality of places relate to transformation of matrices and vectors. For ease of understanding, the description is made herein in a unified manner. The superscript T denoting transposition, e.g. A^TTo representTranspose of matrix (or vector) a; the superscript H denotes a conjugate transpose, e.g., A^HRepresenting the conjugate transpose of matrix (or vector) a. Hereinafter, the description of the same or similar cases will be omitted for the sake of brevity.

Fourth, in the embodiments of the present application, the embodiments provided in the present application are described by taking the case where the beam vector and the frequency domain vector are both column vectors, but this should not limit the present application in any way. Other more possible manifestations will occur to those skilled in the art based on the same idea.

Fifth, in the embodiments of the present application, "for indicating" may include for direct indicating and for indirect indicating. For example, when a certain indication information is described as the indication information I, the indication information may be included to directly indicate I or indirectly indicate I, and does not necessarily represent that I is carried in the indication information.

If the information indicated by the indication information is referred to as information to be indicated, in a specific implementation process, there are many ways of indicating the information to be indicated, for example, but not limited to, directly indicating the information to be indicated, such as the information to be indicated itself or an index of the information to be indicated. The information to be indicated can also be indirectly indicated by indicating other information, wherein an association relationship exists between the other information and the information to be indicated. It is also possible to indicate only a part of the information to be indicated, while the other part of the information to be indicated is known or predetermined. For example, the indication of the specific information may be implemented by means of a predetermined arrangement order of the respective information (e.g., protocol specification), thereby reducing the indication overhead to some extent. Meanwhile, the universal parts of all information can be identified and indicated in a unified mode, so that the indication overhead caused by independently indicating the same information is reduced. For example, it will be understood by those skilled in the art that the precoding matrix is composed of precoding vectors, and that each precoding vector in the precoding matrix may have the same components in terms of composition or other attributes.

The specific indication method may be any of various conventional indication methods, for example, but not limited to, the above indication methods, various combinations thereof, and the like. The specific details of various indication modes can refer to the prior art, and are not described in detail herein. As can be seen from the above, when a plurality of information of the same type are required to be indicated, for example, different information may be indicated differently. In a specific implementation process, a required indication manner may be selected according to a specific need, and the indication manner selected in the embodiment of the present application is not limited, so that the indication manner related to the embodiment of the present application should be understood to cover various methods that enable a party to be indicated to obtain information to be indicated.

In addition, other equivalent forms of the information to be indicated may exist, for example, a row vector may be represented as a column vector, a matrix may be represented by a transposed matrix of the matrix, a matrix may also be represented as a vector or an array, the vector or the array may be formed by connecting each row vector or column vector of the matrix, a kronecker product of two vectors may also be represented as a product of one vector and a transposed vector of another vector, and the like. The technical solutions provided in the embodiments of the present application should be understood to cover various forms. For example, reference to some or all of the features in the embodiments of the present application should be understood to encompass various manifestations of such features.

The information to be indicated may be sent together as a whole, or may be sent separately by dividing into a plurality of pieces of sub information, and the sending periods and/or sending timings of these pieces of sub information may be the same or different. Specific transmission method this application is not limited. The sending period and/or sending timing of the sub information may be predefined, for example, predefined according to a protocol, or may be configured by the transmitting end device by sending configuration information to the receiving end device. The configuration information may include, for example and without limitation, one or a combination of at least two of radio resource control signaling, such as RRC signaling, MAC layer signaling, such as MAC-CE signaling, and physical layer signaling, such as Downlink Control Information (DCI).

Sixthly, the definitions listed herein for many characteristics (e.g., CSI reports, RI, PMI, frequency domain units, spatial vectors, frequency domain vectors, and combining coefficients of space-frequency component matrices, etc.) are only used to explain the functions of the characteristics by way of example, and the details thereof may refer to the prior art.

Seventh, in the embodiments shown below, the first, second, third, fourth and various number numbers are merely for convenience of description and are not intended to limit the scope of the embodiments of the present application. For example, to distinguish between different fields, different indication information, etc.

Eighth, in the embodiments shown below, "pre-configuration" may be indicated in advance through signaling, or may be determined through a preset rule, and the present application is not limited to a specific implementation manner thereof. Corresponding to "pre-configuration," actual reporting "may refer to information actually reported by the terminal device to the network device based on channel measurements. For example, the reporting number of the frequency domain vectors preconfigured for a certain spatial layer may refer to the number of the frequency domain vectors that need to be reported for the spatial layer, and therefore, the reporting number of the frequency domain vectors configured for the certain spatial layer may be greater than or equal to the number of the frequency domain vectors that are actually reported; for another example, the number of reporting the combining coefficients preconfigured for a certain spatial layer may refer to the number of space-frequency vector pairs that need to be reported for the spatial layer, and therefore, the number of reporting the space-frequency vector pairs configured for a certain spatial layer may be greater than or equal to the number of actually reported combining coefficients, and the like.

The "pre-configuration" may be implemented by pre-storing corresponding codes, tables or other manners that can be used to indicate related information in devices (for example, including terminal devices and network devices), and the specific implementation manner of the present application is not limited thereto. Wherein "saving" may refer to saving in one or more memories. The one or more memories may be separate devices or may be integrated in the encoder or decoder, the processor, or the communication device. The one or more memories may also be provided separately, in part, and integrated into the decoder, processor, or communication device. The type of memory may be any form of storage medium and is not intended to be limiting of the present application.

In the embodiment of the present application, for convenience of distinguishing, the parameter preconfigured by the network device carries a subscript "0", and the parameter actually reported by the terminal device is not subscript "0". Therefore, whether each parameter is pre-configured or actually reported can be distinguished by carrying or not carrying the subscript "0" on the parameter. For example, as recited hereinbefore

And "M^r”、

And "M^r,s"and the like. For the sake of brevity, this is not to be enumerated here.

Ninth, the "protocol" referred to in the embodiments of the present application may refer to a standard protocol in the communication field, and may include, for example, an LTE protocol, an NR protocol, and a related protocol applied in a future communication system, which is not limited in the present application.

Tenth, "at least one" means one or more, "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a alone, A and B together, and B alone, where A and B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, at least one (one) of a, b, and c, may represent: a, or, b, or, c, or, a and b, or, a and c, or, b and c, or, a, b and c. Wherein a, b and c may be single or plural respectively.

The method for indicating CSI provided by the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

It should be understood that the methods provided by the embodiments of the present application may be applied to systems that communicate via multiple antenna techniques, such as the communication system 100 shown in fig. 1. The communication system may include at least one network device and at least one terminal device. The network device and the terminal device can communicate through a multi-antenna technology.

It should also be understood that the embodiments shown below do not particularly limit the specific structure of the execution subject of the method provided by the embodiments of the present application, as long as the communication can be performed according to the method provided by the embodiments of the present application by running the program recorded with the code of the method provided by the embodiments of the present application, for example, the execution subject of the method provided by the embodiments of the present application may be a terminal device or a network device, or a functional module capable of calling the program and executing the program in the terminal device or the network device.

Hereinafter, the method for indicating CSI provided in the embodiments of the present application is described in detail by taking an interaction between a network device and a terminal device as an example without loss of generality.

At present, a Type II codebook CSI reporting mode in an NR protocol cannot support a compressed codebook reporting mode.

Currently, in the reporting mode of the non-compressed Type II codebook, only rank 1 or rank 2 is supported. In addition, each spatial beam basis vector corresponds to a wideband magnitude and a subband differential magnitude for each subband. The main parameter for determining the reporting overhead is the number of space domain beam base vectors with the broadband amplitude not being 0 in the L space domain beam base vectors. For compressed codebooks, however, frequency-domain basis vectors are further introduced. The UE needs to report the selected spatial-domain beam basis vector, the frequency-domain beam basis vector, and the amplitude quantization value and the phase quantization value of the corresponding K1 space-frequency combining coefficients. In summary, the current uncompressed Type II CSI reporting format cannot be directly used for CSI reporting of a compressed codebook.

For the compressed codebook, the position indication of the combining coefficient reported by each spatial layer will occupy a large overhead.

And for the compressed codebook, the position of the reported merging coefficient is indicated in a bitmap mode. For the case that the number of reported merging coefficients is small, a large number of 0 s exist in the bitmap indication information. In addition, if the quantization reference amplitude corresponding to a spatial layer is 0, it means that no merging coefficient is reported in one polarization direction of the spatial layer. For the above situation, although there is no combining coefficient to report, it still needs to indicate the combining coefficient position through bitmap to have a certain overhead waste. In addition, the compressed codebook space-frequency merging coefficient quantization adopts amplitude and phase quantization respectively. The amplitude quantization method performs differential amplitude quantization for each polarization direction. For a spatial layer, all reported merging coefficients are normalized by taking the strongest merging coefficient (the merging coefficient with the largest amplitude value) as a reference. For another polarization direction except the polarization direction in which the strongest combining coefficient is located, the reference quantization amplitude value corresponding to the polarization direction always needs to be reported. If a spatial layer has no combining coefficient to report in another polarization direction except the polarization direction in which the strongest combining coefficient is located, the reference quantization amplitude corresponding to the polarization direction is still reported, so that certain overhead waste also exists.

The current space-frequency compression codebook indicates the position of the reported space-frequency merging coefficient in a bitmap mode, for partial scenes, the number of the reported space-frequency merging coefficients is small, and the bitmap indicating the position of the space-frequency merging coefficient has certain redundancy, so that a certain optimization space exists. In order to further reduce the space-frequency compression codebook overhead, a CSI reporting format of a compression codebook is designed by combining a space-frequency compression codebook quantization method. The technical scheme provided by the embodiment of the application can solve the problem of redundant overhead of reporting the position indication information of the merging coefficient under partial scenes, thereby minimizing the reporting overhead of a compressed codebook.

Fig. 2 is a schematic flow chart diagram of a method 200 for indicating CSI provided by an embodiment of the present application, shown from the perspective of device interaction. As shown, the method 200 may include steps 210-230. the steps of the method 200 are described in detail below.

In step 210, the terminal device generates a CSI report, the CSI report including a first part, the first part may include R fields, R being a predefined maximum number of spatial layers; the R field is used to indicate whether there is a space-frequency combining coefficient reported in a first polarization direction corresponding to each space layer in R space layers, where the first polarization direction is a polarization direction other than the polarization direction in which the first space-frequency combining coefficient in each space layer is located, and the first combining coefficient is one space-frequency combining coefficient in the space-frequency combining coefficients reported in each space layer; r is an integer greater than or equal to 1.

Optionally, the first space-frequency combining coefficient is a space-frequency combining coefficient with a maximum amplitude value among space-frequency combining coefficients reported by each space layer; or, the first space-frequency combining coefficient is a strongest space-frequency combining coefficient in the space-frequency combining coefficients reported by each spatial layer.

Optionally, the first space-frequency merging coefficient is a space-frequency merging coefficient with a largest amplitude value in a space-frequency merging coefficient matrix corresponding to each spatial layer; or, the first space-frequency combining coefficient is a strongest (strongest) space-frequency combining coefficient in a space-frequency combining coefficient matrix corresponding to each spatial layer.

Optionally, the first space-frequency combining coefficient is a space-frequency combining coefficient of which an amplitude value is greater than a first amplitude threshold value among the space-frequency combining coefficients reported by each spatial layer.

It should be understood that, in the embodiment of the present application, the R field is used to indicate whether there is an audio merging coefficient reported in the first polarization direction corresponding to each of the R spatial layers, and it can also be understood that the R field is used to indicate whether a quantization reference amplitude corresponding to the first polarization direction of each spatial layer is a preset value.

It should be further understood that the R fields are in a one-to-one correspondence relationship with the R spatial layers, and illustratively, a first field of the R fields is used to indicate whether there is an audio combining coefficient to be reported in a first polarization direction corresponding to the first spatial layer. And the R field in the R fields is used for indicating whether a space frequency merging coefficient is reported in the corresponding first polarization direction in the R spatial layer. Wherein R is more than or equal to R and more than or equal to 1, and R and R are integers.

It should be further understood that, in the embodiment of the present application, the R fields are used to indicate whether there is an empty-frequency combining coefficient reported in the first polarization direction corresponding to each of the R spatial layers, and it can also be understood that whether the empty-frequency combining coefficients reported in each of the R spatial layers are all located in the second polarization direction; it can also be understood whether the bitmaps corresponding to the first polarization directions of each of the R spatial layers are all 0.

The CSI report may be divided into two parts (part 1 and part 2), wherein the first part may be part 1 and the second part described below may be part 2.

In this embodiment, in a spatial layer, for a polarization direction in which a space-frequency combining coefficient with a largest amplitude value among reported space-frequency combining coefficients is located, a reference amplitude may be 1. For another polarization direction, the magnitude of the combining coefficient with the largest magnitude in the polarization direction may be a quantized reference magnitude for the polarization direction.

It should be understood that the quantized reference amplitude referred to in the embodiments of the present application is the quantized reference amplitude in the first polarization direction. Each spatial layer may include a first polarization direction and a second polarization direction, wherein the second polarization direction is a polarization direction in which a space-frequency combining coefficient having a largest amplitude value or a strongest (constraining) space-frequency combining coefficient is located, and the first polarization direction may be a polarization direction other than the second polarization direction.

Optionally, the first part may further include a rank indicator RI for indicating rank (rank), or for indicating that the actual number of spatial layers is Q, where R ≧ Q ≧ 1, Q and R are both integers.

Alternatively, the preset value may be 0 or not 0.

Illustratively, table 1 shows indication information corresponding to part 1.

Table 1 indication information corresponding to part 1

Wherein R is more than or equal to R and more than or equal to 1, and R and R are integers.

Illustratively, table 2 shows another indication information corresponding to part 1.

Table 2 indication information corresponding to part 1

It should be understood that, in this embodiment of the present application, when each field in the R fields is used to indicate whether there is a space-frequency combining coefficient reported in the first polarization direction, a bit value of 0 may be used to indicate that there is a space-frequency combining coefficient reported in the first polarization direction, and a bit value of 1 indicates that there is no space-frequency combining coefficient reported in the first polarization direction; or, a bit value 0 may be used to indicate that no space-frequency combining coefficient is reported in the first polarization direction, and a bit value 1 may be used to indicate that a space-frequency combining coefficient is reported in the first polarization direction.

Illustratively, the CSI part 1 includes R bits, where R is the maximum number of spatial layers supported. Each bit corresponds to one of the R spatial layers, and is used to indicate whether there is an audio merging coefficient to report in a first polarization direction corresponding to each of the R spatial layers.

Exemplarily, when R is 4, the R bits are 1000, which indicates that no space-frequency combining coefficient is reported in the first polarization direction corresponding to the first spatial layer, and that space-frequency combining coefficients are reported in the first polarization directions corresponding to the other three spatial layers; or, it indicates that the first spatial layer has no space-frequency combination coefficient to report in the first polarization direction, and the other three spatial layers have space-frequency combination coefficients to report in the first polarization directions.

Fig. 3 shows a schematic diagram of the strongest amplitude and the quantization reference amplitude of all reported space-frequency combination coefficients corresponding to each spatial layer when the maximum spatial layer is 4 according to the embodiment of the present application. If 4 spatial layers are supported maximally, as shown in fig. 3, the space-frequency combining coefficient with the maximum amplitude corresponding to the first spatial layer is located in the polarization direction 1, no space-frequency combining coefficient is reported in the polarization direction 2, the space-frequency combining coefficients with the maximum amplitude corresponding to the other three spatial layers are also located in the polarization direction 1, and a space-frequency combining coefficient is reported in the polarization direction 2. At this time, for the first spatial layer, in another polarization direction except the polarization direction where the space-frequency combining coefficient with the largest amplitude is located, the amplitude quantization values of all the space-frequency combining coefficients are 0, and no space-frequency combining coefficient needs to be reported. In the CSI report, the CSI Part 1 includes an indication field with a length of 4 bits, which is used to indicate whether each spatial layer has a space-frequency combining coefficient reporting in the first polarization direction. The value of this field is 1000, which indicates that the first spatial layer has no space-frequency combining coefficient to report in the polarization direction 2, and the other three spatial layers have space-frequency combining coefficients to report in the polarization direction 2.

In other words, if 4 spatial layers are supported at maximum, as shown in fig. 3, the quantization reference amplitude corresponding to the polarization direction 2 in the first spatial layer is 0, and the quantization reference amplitudes corresponding to the polarization directions 2 in the other three spatial layers are not 0. At this time, for the first spatial layer, in another polarization direction except the polarization direction where the space-frequency combining coefficient with the largest amplitude is located, the amplitude quantization values of all the space-frequency combining coefficients are 0, and no space-frequency combining coefficient needs to be reported. In the CSI report, the CSI Part 1 includes an indication field with a length of 4 bits, which is used to indicate whether the quantized reference amplitude of each spatial layer is 0. The field has a value of 1000, which indicates that the quantization reference amplitude corresponding to the first spatial layer is 0, and the quantization reference amplitudes corresponding to the other three spatial layers are not 0.

Optionally, part2 may include P fields, where P is the number of spatial layers reported by no space-frequency combining coefficient in the first polarization direction in the R spatial layers, and an mth field in the P fields is used to indicate a polarization direction in which a first space-frequency combining coefficient is located in an mth spatial layer reported by no space-frequency combining coefficient in the first polarization direction; r is more than or equal to P and more than or equal to 1, m is more than or equal to 1 and less than or equal to P, and m and P are integers.

It should be understood that the R fields in part 1 indicate which spatial layers have no space-frequency combination coefficients reported in the first polarization direction, and the R fields further implicitly indicate that P spatial layers of the R spatial layers have no space-frequency combination coefficients reported in the first polarization direction. Then, in part2, P fields can be carried to indicate the polarization direction of the first space-frequency merging coefficient in these spatial layers.

It should be understood that P can also be understood as the number of spatial layers with quantization reference amplitude 0 in the R spatial layers, and the mth field in the P fields is used to indicate the polarization direction of the first space-frequency combination coefficient in the mth spatial layer with quantization reference amplitude 0.

It should also be understood that if P is 0, which indicates that all spatial layers have the space frequency combining coefficient reported in the first polarization direction, the P fields may not be carried in the second part.

Illustratively, the number of R bits in the CSI part 1 is 1000, which indicates that no space-frequency combining coefficient is reported in the first polarization direction of the first spatial layer, and that a space-frequency combining coefficient is reported in the first polarization direction corresponding to each of the other three spatial layers. P and m are 1 and this field in part2 is used to indicate the polarization direction in which the largest magnitude space-frequency merging coefficient in the first spatial layer is located. As shown in fig. 3, the field in part2 is used to indicate that the polarization direction of the space-frequency combining coefficient with the largest amplitude in the one spatial layer is polarization direction 1, that is, polarization direction 2 reports no combining coefficient.

Illustratively, when R is 3, and R bits in the CSI part 1 are 110, it indicates that there is no space-frequency combination coefficient reporting in the first polarization direction corresponding to the first spatial layer and the second spatial layer degree, and there is a space-frequency combination coefficient reporting in the first polarization direction corresponding to the third spatial layer. P is 2, the first field in part2 is used to indicate the polarization direction of the spatial frequency combining coefficient with the largest amplitude in the first spatial layer, and the second field in part2 is used to indicate the polarization direction of the spatial frequency combining coefficient with the largest amplitude in the second spatial layer.

Optionally, part2 may further include L × M bits, where the L × M bits are used to indicate a position of the space-frequency combining coefficient reported in the polarization direction where the first space-frequency combining coefficient is located in the spatial layer with the M-th quantization reference amplitude being 0; and L and M are respectively the number of the space domain basis vectors and the number of the frequency domain basis vectors in the spatial layer with the mth reference amplitude as the preset value, and both L and M are positive integers.

Illustratively, the R bits are 1000, which indicates that the quantized reference amplitude corresponding to the first spatial layer is 0, and the quantized reference amplitudes corresponding to the other three spatial layers are not 0. Then part2 also includes bitmap, which may include L₁*M₁A bit, the L₁*M₁One bit may be used to indicate the position of the space-frequency combining coefficient in the first spatial layer that is scheduled to be reported in direction 1.

It should be understood that L in the above example₁*M₁The bit is used for indicating the position of the space-frequency merging coefficient reported in the polarization direction of the space-frequency merging coefficient with the maximum amplitude in the first space layer, and the bitmap further comprises other bits for indicating the positions of the space-frequency merging coefficients reported in the second space layer, the third space layer and the fourth space layer

Illustratively, table 3 shows the number of corresponding spatial basis vectors and the number of frequency domain basis vectors in each space.

Table 3 shows the number of corresponding space domain basis vectors and the number of corresponding frequency domain basis vectors in each space

Spatial layer indexing	Number of space domain basis vectors	Number of frequency domain basis vectors
			Spatial layer 1	L₁	M₁
Spatial layer 2	L₂	M₂
			Spatial layer 3	L₃	M₃
Spatial layer 4	L₄	M₄

If the R bits are 1000, the total bit length of bitmap is L₁*M₁+2*L₂*M₂+2*L₃*M₃+2*L₄*M₄。

It should be understood that the number of the space-domain basis vectors corresponding to each space layer may be the same, may be partially the same, or may be all different; the number of frequency domain basis vectors corresponding to each spatial layer may be the same, may be partially the same, or may be different.

In one embodiment, the number of the spatial basis vectors and the number of the frequency domain basis vectors of each spatial layer are the same, for example, the number of the spatial basis vectors may be L, and the number of the frequency domain basis vectors may be M. If the R bits are 1000, the total bit length of the bitmap is 7 × L × M.

Optionally, the second portion comprises (Q-P) quantization reference amplitudes in case the value of (Q-P) is larger than 0.

Illustratively, Q is 4, P is 1, that is, no space-frequency combination coefficient is reported in a first polarization direction in a first space layer among 4 space layers, so that part2 may carry 3 quantized reference amplitudes in the first polarization direction, where the 3 quantized reference amplitudes are quantized reference amplitudes corresponding to a second space layer, a third space layer, and a fourth space layer, respectively.

In other words, no space-frequency combination coefficient is reported in the first space layer of the 4 space layers in the first polarization direction, so that the quantized reference amplitude of the first space layer in the first polarization direction may not be reported; the second spatial layer to the fourth spatial layer have space-frequency combination coefficients reported in the first polarization direction, and the quantized reference amplitudes of the second spatial layer to the fourth spatial layer in the first polarization direction can be reported.

Illustratively, table 4 shows indication information corresponding to CSI part 2.

Table 4 indication information corresponding to CSI part2

It should be understood that the index of the polarization direction where the spatial frequency combination coefficient with the strongest amplitude corresponds to the spatial layer with the quantization reference amplitude of 0 may also be understood as an index of the first polarization direction corresponding to the spatial layer with the quantization reference amplitude of 0.

Table 5 shows indication information corresponding to another CSI part 2.

Table 5 indication information corresponding to CSI part2

It should be understood that the index indication of the polarization direction in which the space-frequency combining coefficient with the largest amplitude corresponding to the spatial layer is reported without the combining coefficient in the first polarization direction may also be understood as the index indication of the first polarization direction corresponding to the spatial layer without the combining coefficient in the first polarization direction.

In this embodiment of the present application, since the quantization reference amplitude corresponding to the first spatial layer is 0, it means that there is no merging coefficient reporting in one polarization direction in the spatial layer. And further indicating the polarization direction without the combination coefficient reporting in the CSI part2, so that the terminal equipment can delete the bitmap overhead indicating the position of the space-frequency combination coefficient, and the CSI reporting overhead of the terminal equipment can be saved.

In step 220, the terminal device sends the CSI report to the network device. Accordingly, the network device receives the CSI report sent by the terminal device.

The terminal device may send the CSI report to the network device through a physical uplink resource, such as a Physical Uplink Shared Channel (PUSCH) or a Physical Uplink Control Channel (PUCCH), for example.

The specific method for the terminal device to send the CSI report to the network device through the physical uplink resource may be the same as that in the prior art, and a detailed description of a specific process is omitted here for brevity.

In step 230, the network device determines, according to the CSI report, a precoding matrix corresponding to the space frequency reported by each of the Q spatial layers.

The specific process that the terminal device indicates the positions of the space-frequency combining coefficients reported for the R spatial layers through the CSI report has been described in detail in step 210 above. The network device, after receiving the CSI report, may decode the first portion of the CSI report according to a predefined length of the first portion. After parsing the first portion of the CSI report, the quantized reference amplitude for each spatial layer may be determined, such that the indicated overhead for the second portion of the CSI report may be determined, which in turn may be decoded. After decoding the second portion, the precoding matrices for the Q spatial layers may be determined.

Or after the first part of the CSI report is analyzed, it may be determined whether each spatial layer has an empty frequency combining coefficient to report in the first polarization direction, so that the indication overhead of the second part of the CSI report may be determined, and the second part may be decoded. After decoding the second portion, the precoding matrices for the Q spatial layers may be determined.

The specific process of analyzing the CSI report by the network equipment is similar to the specific process of generating the CSI report by the terminal equipment. A detailed description of this particular process is omitted here for the sake of brevity. In addition, the specific processes related to decoding may refer to the prior art, and a detailed description of the specific processes is omitted here for the sake of brevity.

Taking R and Q as 4 for example, after parsing part 1 of the CSI report, the network device may determine that the R bits are 1000, and then the network device may know that the quantized reference amplitude of the first spatial layer is 0, and the quantized reference amplitudes of the other spatial layers are not 0, so that the network device may also determine that the overhead of bitmaps in part2 is 7 × L × M (it is assumed here that the number of spatial basis vectors of each spatial layer is L and the number of frequency domain basis vectors is M).

After decoding part2 in the CSI report, the P fields may be determined, and according to the P fields, the network device may determine that the polarization direction of the space-frequency combining coefficient with the strongest amplitude in the first spatial layer is polarization direction 1, so that the network device may determine that the first L × M bits indicate the position of the space-frequency combining coefficient in the polarization direction 1 in the first spatial layer, and the remaining 6 × L × M bits indicate the positions of the space-frequency combining coefficients in the polarization directions 1 and 2 in the second spatial layer, the third spatial layer, and the fourth spatial layer. And the network device can determine the precoding matrix of the Q spatial layers after determining the indication information in other part 2.

In this embodiment of the present application, if the quantization reference amplitude corresponding to one spatial layer is 0, it indicates that no combining coefficient needs to be reported in another polarization direction other than the polarization direction in which the space-frequency combining coefficient with the largest amplitude corresponding to the spatial layer is located. Accordingly, the network device may determine that the bitmap length indicating the position of the merging coefficient corresponding to the spatial layer in the CSI part2 is L × M. If the quantization reference amplitude corresponding to a spatial layer is not 0, the bitmap length indicating the merging coefficient position corresponding to the spatial layer is 2 × L × M. So that the overhead of CSI part2 can be determined from CSI part 1.

For the existing non-compressed Type 2 codebook, the existing CSI reporting format cannot support the reporting parameters corresponding to the compressed codebook. For the compression codebook, it is necessary to additionally indicate the position of the space-frequency combining coefficient and the number of the space-frequency combining coefficients. In addition, due to the special space-frequency merging coefficient quantization method of the compressed codebook, the quantization reference amplitude corresponding to the first polarization direction needs to be indicated. In the technical scheme of the embodiment of the application, a new design is performed on a CSI report format aiming at parameters needing to be reported by a compressed codebook, and a spatial layer number indication with a quantized reference amplitude being a preset value (for example, 0 or non-0) or a spatial basis vector number indication with a merging coefficient for reporting is introduced into a CSI part 1. The CSI part2 introduces a merging coefficient position indication, and the overhead of the position indication information is directly related to the number of spatial layers with the quantized reference amplitude of 0 or the number of spatial basis vectors with the merging coefficient reporting, which are indicated in the CSI part 1.

For the existing compression Type 2 codebook, although parameters that the compression codebook needs to report are embodied, in CSIpart 2, the location for indicating the space-frequency combining coefficient is indicated by a bitmap with a length of 2 × L × M bits. In some scenarios, a bitmap indicating the complete 2 × L × M bit length is still required, although the number of space-frequency combining coefficients reported is small (there are a large number of 0 s in the bitmap). In the technical solution of the embodiment of the application, the indication information with smaller bit overhead is added to the CSI part 1 to indicate whether the quantization reference amplitude of each spatial layer is a preset value (e.g., 0 or non-0). And adding indication information in the CSI part2, wherein the indication information is used for indicating the polarization direction of the space-frequency combining coefficient with the maximum amplitude in the space layer without reporting the space-frequency combining coefficient in the first polarization direction. And for the polarization directions except the polarization direction of the space-frequency merging coefficient with the maximum amplitude, deleting the bitmap corresponding to the position of the indicated merging coefficient. According to the technical scheme of the embodiment of the application, the redundancy overhead for indicating the position of the space-frequency combination coefficient can be effectively reduced, so that the reporting overhead of the compressed codebook CSI is reduced.

Fig. 4 is a schematic flow chart diagram illustrating a method 300 for indicating CSI provided by an embodiment of the present application from the perspective of device interaction. As shown, the method 300 may include steps 310 through 330, each of which is described in detail below with respect to the method 300.

In step 310, the terminal device generates a CSI report, where the CSI report includes a first portion, where the first portion includes first indication information, where the first indication information is used to indicate a number of spatial layers that have no space-frequency combination coefficient reported in a first polarization direction, where the number is less than or equal to a predefined maximum number R of spatial layers, the first polarization direction is a polarization direction other than a polarization direction in which a first space-frequency combination coefficient in each spatial layer of the R spatial layers is located, and the first space-frequency combination coefficient is one of the space-frequency combination coefficients reported in each spatial layer; r is an integer greater than or equal to 1.

It should be understood that, in the embodiment of the present application, the first indication information is used to indicate the number of spatial layers that have no space-frequency merging coefficient reported in the first polarization direction, and may also be understood as the first indication information is used to indicate the number of spatial layers whose quantization reference amplitude is a preset value; alternatively, the first indication information may be understood to indicate the number of spatial layers in which the bitmaps corresponding to the first polarization direction are all 0. It is also understood that the first part may further include a rank indication RI, which is used to indicate a rank (rank), or to indicate that the actual number of spatial layers is Q, where R ≧ Q ≧ 1, Q and R are both integers.

Illustratively, table 6 shows another indication information corresponding to part 1.

Table 6 indication information corresponding to part 1

Illustratively, table 7 shows another indication information corresponding to part 1.

Table 7 indication information corresponding to part 1

For example, when R is 4, one of the 4 spatial layers has no space-frequency combining coefficient to report in the first polarization direction, and the other spatial layers have space-frequency combining coefficients to report in the first polarization direction. The first indication information may indicate that the number of spatial layers reported without the space-frequency combination coefficient in the first polarization direction is 1.

Illustratively, when R is 4, one spatial layer among the 4 spatial layers has a quantization reference amplitude of 0 in the first polarization direction, and the remaining spatial layers have quantization reference amplitudes of other than 0 in the first polarization direction. The first indication information may indicate that the number of spatial layers whose quantization reference amplitude is 0 is 1.

Optionally, the bit overhead of the first indication information is

If the maximum number of the spatial layers supports 4 spatial layers, the CSI Part 1 includes first indication information, where the first indication information includes 3 bits, and is used to indicate the total number of spatial layers with a quantization reference amplitude of 0 in all the spatial layers, or indicate the total number of spatial layers without space-frequency combination coefficient reporting in the first polarization direction in all the spatial layers.

Taking the example in fig. 3 as an example, for rank 4, the first spatial layer reports no space-frequency combining coefficient in the first polarization direction (polarization direction 2), and the other three spatial layers report space-frequency combining coefficients in the first polarization direction (polarization direction 2). The first indication information may be 001 indicating that there is a spatial layer to report without combining coefficients in the first polarization direction.

Taking the example in fig. 3 as an example, for rank 4, the quantized reference amplitude corresponding to the first spatial layer is 0, and the quantized reference amplitudes corresponding to the other three spatial layers are not 0. The first indication information may be 001 indicating that there is one spatial layer corresponding to a quantization reference amplitude of 0.

In this embodiment of the present application, if a spatial layer does not have a space-frequency combination coefficient to report in a first polarization direction (or a quantized reference amplitude corresponding to a spatial layer is 0), it indicates that no combination coefficient needs to be reported in another polarization direction other than the polarization direction in which the strongest space-frequency combination coefficient corresponding to the spatial layer is located. Correspondingly, it may be determined that, in the CSI part2, the bitmap length indicating the position of the combining coefficient corresponding to the spatial layer is L × M, and is used to indicate the position of the space-frequency combining coefficient reported by the spatial layer in the second polarization direction. Under the condition that the number of the spatial basis vectors and the number of the frequency basis vectors configured for all the spatial layers are the same, the bitmap overhead indicating the positions of the space-frequency combining coefficients corresponding to all the spatial layers in the CSI part2 can be determined only by indicating the total number of the quantized reference amplitudes of all the spatial layers as 0 in the CSI part 1. Compared with the CSI part 1 in the method 200, the CSI part 1 in the method 300 indicates the total number of all spatial layer quantization reference amplitudes as 0, so that for different ranks, the overhead variation range of the indication information is small, thereby well meeting the requirement of the CSI part 1 on fixed overhead and reducing overhead waste caused by rank variation.

Optionally, the CSI report further includes a second portion, where the second portion includes second indication information, where the second indication information is used to indicate whether each of the Q spatial layers has a space-frequency combination coefficient to report in the first polarization direction, or the second indication information is used to indicate whether a quantization reference amplitude corresponding to each of the Q spatial layers is 0.

Optionally, the second indication information may include Q fields, and each of the Q fields may be used to display an indication whether each spatial layer is reported without space-frequency combining coefficients in the first polarization direction.

For example, Q is 4, and the second indication information may be 1100, indicating that no space-frequency combining coefficient is reported in the first polarization direction of the first spatial layer and the second spatial layer, and that there is a space-frequency combining coefficient is reported in the first polarization direction of the third spatial layer and the fourth spatial layer.

It should be understood that if the terminal device carries the Q fields in the second indication information, in case (Q-K) is greater than 0, the second portion may further include quantized reference amplitudes corresponding to each of the (Q-K) spatial layers.

It should be understood that, if part 1 indicates that the number of spatial layers reported without the space-frequency combination coefficient is not 0, the terminal device may carry the Q bits in the second indication information.

Optionally, the second indication information is a quantization reference amplitude corresponding to each of the Q spatial layers, and whether no space-frequency combination coefficient is reported in the first polarization direction can be implicitly indicated by the quantization reference amplitude corresponding to each spatial layer.

It should be understood that if the second indication information is the quantized reference amplitude of each spatial layer, the terminal device needs to carry the quantized reference amplitude of each of the Q spatial layers in the second portion.

After knowing that no combining coefficient is reported in the first polarization direction of the spatial layers, the terminal device may also notify the network device of the polarization direction in which the spatial frequency combining coefficient with the largest amplitude in the spatial layers is located.

Optionally, the second part further includes K bits, where K is the number of spatial layers that have no space-frequency combining coefficient reported in the first polarization direction, and an nth bit of the K bits is used to indicate a polarization direction in which the first combining coefficient is located in an nth spatial layer that has no space-frequency combining coefficient reported in the first polarization direction; q is more than or equal to K and more than or equal to 1, n is more than or equal to 1 and less than or equal to K, and K and n are integers.

For example, taking fig. 3 as an example, the second indication information may indicate that no space-frequency combining coefficient is reported in the first polarization direction of the first spatial layer, and that there is a space-frequency combining coefficient is reported in the first polarization direction of the second spatial layer, the third spatial layer, and the fourth spatial layer. Then part2 may further include 1 bit, where the 1 bit is used to indicate that the polarization direction in which the space-frequency combination coefficient with the largest amplitude value is located on the first spatial layer is polarization direction 1.

Optionally, the second part further comprises L₁*M₁A bit, the L₁*M₁One bit for indicatingThe position of the space-frequency combining coefficient reported by the polarization direction of the first combining coefficient in the nth space layer without reporting the space-frequency combining coefficient in the first polarization direction; l is₁And M₁The number of space domain basis vectors and the number of frequency domain basis vectors in the nth space layer reported without the space-frequency combination coefficient in the first polarization direction, L₁And M₁Are all positive integers.

Illustratively, taking fig. 3 as an example, part may further include L₁*M₁A bit, the L₁*M₁One bit is used to indicate the position of the space-frequency combining coefficient in polarization direction 1 in the first spatial layer.

Optionally, in case (Q-K) is greater than 0, the second part further comprises 2 x L₂*M₂A bit of 2 x L₂*M₂The bits are used for indicating the position of a space-frequency merging coefficient reported by a jth space layer in the (Q-K) space layers in the first polarization direction, wherein j is more than or equal to 1 and less than or equal to (Q-K), and j is an integer; l is₂And M₂The number of space-domain basis vectors and the number of frequency-domain basis vectors, L, in the space layer reported by the jth space-frequency merging coefficient in the first polarization direction are respectively₂And M₂Are all positive integers.

For example, taking fig. 3 as an example, the number of the space-domain basis vectors and the number of the frequency-domain basis vectors in each spatial layer may be as shown in table 3, and part2 may further include 2 × L₂*M₂+2*L₃*M₃+2*L₄*M₄A bit of which 2 x L₂*M₂One bit is used to indicate the position of the space-frequency merging coefficient on the second spatial layer, +2 x L₃*M₃One bit for indicating the position of the space-frequency combining coefficient on the third spatial layer, 2 x L₄*M₄One bit is used to indicate the position of the space-frequency combination coefficient on the fourth spatial layer. The total bit length of the total bitmaps in part2 is L₁*M₁+2*L₂*M₂+2*L₃*M₃+2*L₄*M₄。

In one embodiment, the number of the spatial basis vectors and the number of the frequency domain basis vectors of each spatial layer are the same, for example, the number of the spatial basis vectors may be L, and the number of the frequency domain basis vectors may be M. If the first indication information indicates that there is one spatial layer in the first direction without reporting the space-frequency combining coefficient, the total bit length of the bitmap is 7 × L × M, and the 7 × L × M bits are used for indicating the position of the space-frequency combining coefficient reported by each spatial layer.

In the embodiment of the present application, since the quantization reference amplitude corresponding to the spatial layer is 0, it means that there is no merging coefficient reporting in one polarization direction in the spatial layer. Only the total number of all spatial layer quantized reference amplitudes of 0 is indicated in CSI part 1, and indication information indicating the quantized reference amplitude for each spatial layer is also present in CSI part 2. According to the technical scheme provided by the embodiment of the application, the polarization direction reported without the merging coefficient is further indicated in the CSI part2, so that the bitmap overhead for indicating the position of the space-frequency merging coefficient can be deleted.

In step 320, the terminal device sends the CSI report to the network device. Accordingly, the network device receives the CSI report sent by the terminal device.

The terminal device may send the CSI report to the network device through a physical uplink resource, such as PUSCH or PUCCH, for example.

In step 330, the network device determines precoding matrices corresponding to the Q spatial layers according to the CSI report.

The specific process that the terminal device indicates the positions of the space-frequency combining coefficients reported for the R spatial layers through the CSI report has been described in detail in step 310 above. The network device, after receiving the CSI report, may decode the first portion of the CSI report according to a predefined length of the first portion. After the first part of the CSI report is analyzed, the number of spatial layers reported without a space-frequency combination coefficient in the first polarization direction may be determined, so that the indication overhead of the second part of the CSI report may be determined, and the second part may be decoded. After decoding the second portion, the precoding matrices corresponding to the Q spatial layers may be determined.

Taking R and Q as 4 for example, the network device may parse part 1 of the CSI report, it can be determined by the first indication information that the number of spatial layers reported without the space-frequency combination coefficient in the first polarization direction is 1, the network device can know that there is no space-frequency combination coefficient reported in the first polarization direction of a space layer (or, it can be determined that the quantization reference amplitude corresponding to a space layer is 0), the space-frequency merging coefficients are reported in the first polarization directions of the other 3 spatial layers (or it can be determined that the quantized reference amplitudes corresponding to the other 3 spatial layers are not 0), thus, the network device may further determine that the overhead of bitmap in part2 is 7 × L × M (it is assumed here that the number of space domain basis vectors of each space layer is L and the number of frequency domain basis vectors is M), and the 7 × L × M bits are used to indicate the location information of the space-frequency merging coefficients reported by the 4 space layers.

After decoding part2 in the CSI report, the second indication information and the K bits may be determined, and the network device may determine which spatial layers have no space-frequency combination coefficient reporting in the first polarization direction or determine which spatial layers have a quantization reference amplitude of 0. After determining which spatial layers have no space-frequency combination coefficients reported in the first polarization direction, the network device may further determine, by K bits, the polarization direction in which the space-frequency combination coefficient with the largest amplitude is located in the spatial layers having no space-frequency combination coefficients reported in the first polarization direction. The network device may determine that the first L x M bits indicate positions of space-frequency combining coefficients in polarization direction 1 in the first spatial layer, and the remaining 6 x L x M bits indicate positions of space-frequency combining coefficients in polarization direction 1 and polarization direction 2 in the second spatial layer, the third spatial layer, and the fourth spatial layer. And the network device can determine the precoding matrix of the Q spatial layers after determining the indication information in other part 2.

Fig. 5 is a schematic flow chart diagram illustrating a method 400 of indicating CSI provided by an embodiment of the present application from the perspective of device interaction. As shown, the method 400 may include steps 410-430. the steps in the method 400 are described in detail below.

In step 410, the terminal device generates a CSI report, the CSI report comprising a first part, the first part comprising R fields, R being a predefined maximum number of spatial layers; each field in the R fields is used to indicate the number of first space-domain basis vectors in a space-frequency combining coefficient matrix corresponding to each space layer in the R space layers, where the first space-domain basis vectors are space-domain basis vectors that have been reported by combining coefficients in the space-frequency combining coefficient matrix, or the first space-domain basis vectors are space-domain basis vectors that have not been reported by combining coefficients in the space-frequency combining coefficient matrix; r is an integer greater than or equal to 1.

Illustratively, table 8 shows another indication information corresponding to part 1.

Table 8 indication information corresponding to part 1

For example, if the maximum supported spatial layer R is 4, the number of polarization directions of the transmit antennas is 2, and the same L spatial basis vectors are selected for the two polarization directions, each spatial layer contains 2L — 8 spatial basis vectors in total in the two polarization directions.

When determining the number of space-domain basis vectors reported by the space-frequency combining coefficient, the terminal equipment can have the following two situations:

first case

For the L space-domain basis vectors, the terminal device may select Z from 2L space-domain basis vectors of two polarization directions corresponding to the L space-domain basis vectors_iReporting space-frequency merging coefficient by each space-domain basis vector, wherein 2L is more than or equal to Z_i≥1。

For example, the CSI Part 1 may include 4 fields, each field includes 3 bits, and is used to indicate the number of space-domain basis vectors reported by the space-frequency combining coefficient corresponding to the ith space-domain layer. For rank 4, if the values corresponding to the 4 fields are 7, 8, 6, and 6, respectively, it indicates that 1 space-domain basis vector non-merging-coefficient report exists for spatial layer 1, at least one merging coefficient exists for all space-domain basis vectors and needs to be reported for

spatial layer

2, and 2 space-domain basis vectors non-merging-coefficients need to be reported for spatial layer 3 and spatial layer 4.

It should be understood that when reporting the space-frequency combining coefficient of a certain spatial layer, the terminal device may choose to report the space-frequency combining coefficient of a space-frequency basis vector in the first polarization direction, and not report the space-frequency combining coefficient of the space-frequency basis vector in the second polarization direction, and at this time, for a spatial layer, the number of the space-frequency basis vectors reported by the space-frequency combining coefficients may be an odd number or an even number.

Second case

For the L spatial basis vectors, the terminal device may select from the L spatial basis vectors

Reporting space-frequency merging coefficients by the space-domain basis vectors, wherein,

for example, the CSI Part 1 may include 4 fields, each field includes 2 bits, and is used to indicate the number of space-domain basis vectors reported by the space-frequency combining coefficient corresponding to the ith space-domain layer. For rank 4, if the values corresponding to the 4 fields are 3, 2, 4, and 4, respectively, it indicates that 1 space-domain basis vector exists for spatial layer 1, and no merging coefficient is reported in the first polarization direction and the second polarization direction; for the

spatial layer

2, 2 space-domain basis vectors are reported without a merging coefficient in the first polarization direction and the second polarization direction; for spatial layer 3 and spatial layer 4, there is at least one merging coefficient for all spatial basis vectors to be reported.

It should be understood that, when reporting the space-frequency combination coefficient of a certain spatial layer, the terminal device considers that a space-frequency basis vector has no combination coefficient to report when a certain space-frequency basis vector has no space-frequency combination coefficient to report in both the first polarization direction and the second polarization direction, and at this time, for a spatial layer, the number of space-frequency basis vectors reported by the space-frequency combination coefficients is an even number.

Optionally, the CSI report further includes part2, where part2 includes Y fields, and Y is the number of spatial layers with spatial basis vectors reported without merging coefficients in the Q spatial layers; the ith field in the Y fields is used for indicating the index of a space-frequency base vector reported without a merging coefficient in a space-frequency merging coefficient matrix corresponding to the ith space layer with the reported absence of the merging coefficient; q is more than or equal to Y and more than or equal to 1, i is more than or equal to 1 and less than or equal to Y, and Y and i are integers.

The R fields already indicate the number of the space base vectors reported by the space-frequency merging coefficients corresponding to each spatial layer, wherein the space base vectors reported by Y spatial layers without merging coefficients exist in Q spatial layers, so that it is necessary to carry Y fields in part2 to indicate the index of the space base vectors reported by each spatial layer without merging coefficients in Y spatial layers.

When determining the bit overhead of the ith field, the first case may be divided into two cases, where the ith spatial layer where no merging coefficient is reported includes a first polarization direction and a second polarization direction, and the bit overhead of the ith field is

Wherein 2L is the space layer corresponding to the space base vector with the ith space base vector without the combined coefficient, and the first polarization direction and the second polarization directionNumber of space base vectors in the formation direction, Z_iThe number of the space domain basis vectors reported by the merging coefficients in the 2L space domain basis vectors is shown.

For example, for rank 4, if the values corresponding to the R fields are 7, 8, 6, and 6, based on the number of spatial layers in which spatial basis vectors without merging coefficients reported exist in all spatial layers indicated by the R fields in the CSI part 1, the CSIPart 2 includes 3 fields. Each of the 3 subfields corresponds to spatial layer 1, spatial layer 3, and spatial layer 4, respectively. And the index of the space domain base vector is respectively used for indicating the space domain base vectors reported without the merging coefficients in the 2L space domain base vectors on the three space layers. For the first of these 3 fields, 3 bits are contained; for the second and third of these 3 fields, 5 bits are included.

Optionally, the second moiety further comprises Z_iM bits, Z_iAnd M bits are used for indicating the position of the space-frequency merging coefficient reported by the ith space layer without the merging coefficient, and M is the number of the frequency domain basis vectors in the space layer corresponding to the space-frequency basis vectors without the merging coefficient.

Illustratively, for rank 4, if the R fields respectively correspond to values of 7, 8, 6, part2 further includes a bitmap, and the bitmap includes 7M₁+8M₂+6M₃+6M₄And the bit is used for indicating the position of the space-frequency merging coefficient reported by each spatial layer. Wherein, the bitmap for indicating the reported space-frequency merging coefficient position of the space layer 1 comprises 7M₁One bit, M₁The number of frequency domain basis vectors in the spatial layer 1 is shown; the bitmap for indicating the reported space-frequency merging coefficient position of the spatial layer 2 comprises 8M₂One bit, M₂The number of frequency domain basis vectors in the spatial layer 2 is shown; the bitmap for indicating the reported space-frequency merging coefficient position of the spatial layer 3 comprises 6M₃One bit, M₃The number of frequency domain basis vectors in the spatial layer 3; the bitmap for indicating the reported space-frequency merging coefficient position of the 3 rd spatial layer comprises 6M₄One bit, M₄The number of frequency domain basis vectors in spatial layer 4.

For theIn the second case, the ith spatial layer with no merging coefficient reporting includes a first polarization direction and a second polarization direction, and the bit overhead of the ith field is

Wherein L is the number of the spatial domain base vectors in the spatial layer corresponding to the spatial domain base vector reported by the ith existence of no merging coefficient, and Z_iThe number of the space domain basis vectors reported by the merging coefficients in the L-th space domain basis vector in the first polarization direction and the second polarization direction is determined.

For example, for rank 4, if the values corresponding to the R fields are 3, 2, 4, and 4, respectively, based on the number of spatial layers in which spatial basis vectors without merging coefficients reported exist in all spatial layers indicated by the R fields in the CSI part 1, the CSIPart 2 includes 2 fields. Each of the 2 subfields corresponds to spatial layer 1 and spatial layer 2, respectively. And the index of the space domain base vector is respectively used for indicating that no merging coefficient is reported in the L space domain base vectors on the two space layers. For the first of these 2 fields, 2 bits are contained; for the second of these 2 fields, 3 bits are included.

Optionally, the second part further comprises

One bit of the data is transmitted to the receiver,

the bit is used for indicating the position of the spatial-frequency merging coefficient reported by the ith spatial layer with the non-merging coefficient, and M is the number of the frequency domain basis vectors in the spatial layer corresponding to the spatial domain basis vector with the non-merging coefficient.

Illustratively, for rank 4, if the R fields respectively correspond to values of 3, 2, 4, part2 further includes a bitmap, and the bitmap includes 6M₁+4M₂+8M₃+8M₄And the bit is used for indicating the position of the space-frequency merging coefficient reported by each spatial layer. Wherein, the reporting space-frequency merging system for indicating the space layer 1The bit map of the number position comprises 6M₁One bit, M₁The number of frequency domain basis vectors in the spatial layer 1 is shown; the bitmap for indicating the reported space-frequency merging coefficient position of the spatial layer 2 comprises 4M₂One bit, M₂The number of frequency domain basis vectors in the spatial layer 2 is shown; the bitmap for indicating the reported space-frequency merging coefficient position of the spatial layer 3 comprises 8M₃One bit, M₃The number of frequency domain basis vectors in the spatial layer 3; the bitmap for indicating the reported space-frequency merging coefficient position of the 3 rd spatial layer comprises 8M₄One bit, M₄The number of frequency domain basis vectors in spatial layer 4.

Illustratively, table 9 shows indication information contained in CSI part2

TABLE 9 indication information contained in CSI part2

In the method 300 provided by the embodiment of the present application, the indication granularity is further reduced to the level of the spatial basis vector. And if the number of the spatial domain basis vectors needing to be reported without the combination coefficient corresponding to one spatial layer is X. Accordingly, it can be determined that the bitmap length indicating the merging coefficient position corresponding to the spatial layer in CSIpart 2 is (2L-X) × M or 2 × (L-X) × M. Therefore, the number of the space-domain basis vectors reported by the merging coefficients corresponding to each spatial layer indicated in the CSI part 1 can determine the bitmap overhead of the CSI part2 indicating the position of the space-frequency merging coefficients corresponding to each spatial layer. Because each spatial layer has at most 8 space-domain basis vectors, the indication information indicating the number of the space-domain basis vectors reported by the merging coefficient and corresponding to each spatial layer in the CSI part 1 only needs 3 bits, which can better meet the requirement of the CSI part 1 on overhead.

The overhead in CSI part2 is dynamically determined based on the indication in CSI part 1. If one or more spatial basis vectors have no merging coefficient and need to be reported in one spatial layer, the spatial basis vectors reported without the merging coefficient are further indicated by introducing fewer bits in the CSI part2, so that the bitmap overhead indicating the positions of the spatial-frequency merging coefficients corresponding to the corresponding spatial basis vectors can be deleted.

In step 420, the terminal device sends the CSI report to the network device. Accordingly, the network device receives the CSI report sent by the terminal device.

In step 430, the network device determines precoding matrices corresponding to the Q spatial layers according to the CSI report.

The specific process that the terminal device indicates the positions of the space-frequency combining coefficients reported for the R spatial layers through the CSI report has been described in detail in step 410 above. The network device, after receiving the CSI report, may decode the first portion of the CSI report according to a predefined length of the first portion. After the first part of the CSI report is analyzed, the number of spatial layers reported without a space-frequency combination coefficient in the first polarization direction may be determined, so that the indication overhead of the second part of the CSI report may be determined, and the second part may be decoded. After decoding the second portion, the precoding matrices corresponding to the Q spatial layers may be determined.

Taking R and Q as 4 for example, after parsing part 1 of the CSI report, the network device may determine, through the R fields, the number of space-domain basis vectors reported without space-frequency combination coefficients on each spatial layer. Taking R field indication values of 7, 8, 6, and 6 as an example, the network device may know that 1 of 8 space-domain basis vectors in the first space layer has no space-frequency merging coefficient to report, each space-domain basis vector in the second space layer has at least one merging coefficient to report, and each of the third and fourth space layers has 2 space-domain basis vectors having no space-frequency merging coefficient to report, so that the network device may also determine that the overhead of bitmaps in part2 is 7 × M +8 × M +6 × M — 27 × M (it is assumed here that the number of space-domain basis vectors in each space layer is L and the number of frequency-domain basis vectors is M).

After decoding part2 in the CSI report, the Y bits may be determined, and the network device may determine, through the Y bits, an index of a space-base vector reported without a space-frequency merging coefficient in each spatial layer. After determining the index of the space-frequency basis vector reported by the space-frequency combining coefficient in each space layer, the network device may further determine the position of the space-frequency combining coefficient on the first space layer by 7 × M bits; determining the position of the space-frequency merging coefficient on the second space layer by 8M bits; determining the position of the space-frequency merging coefficient on the third spatial layer by 6 x M bits; the position of the space-frequency combination coefficient on the fourth spatial layer is determined by 6 x M bits. Furthermore, after determining the indication information in other part2 in table 9, the network device may determine the precoding matrices of the Q spatial layers.

It should be understood that the above case of network device decoding is described by taking the first case as an example, and the embodiment of the present application is not limited to the first case, and may also be the second case, and the present application is not limited to this.

The method 300 of the embodiment of the application can dynamically determine the overhead in the CSI part2 by the network device based on the indication in the CSI part 1. If one or more spatial basis vectors have spatial basis vectors without merging coefficients to be reported in one spatial layer, the spatial basis vectors without merging coefficients to be reported are further indicated in the CSI part2 by introducing fewer bits, so that the bitmap overhead of the indication spatial-frequency merging coefficients corresponding to the corresponding spatial basis vectors can be deleted.

Fig. 6 is a schematic flow chart of a method 500 for indicating CSI provided by an embodiment of the present application, shown from the perspective of device interaction. As shown, the method 500 may include steps 510-530, each of which is described in detail below with respect to the method 500.

In step 510, the terminal device determines at least two space-frequency combining coefficients; wherein at least one space-frequency combining coefficient is associated with a first polarization direction; and at least one space-frequency combining coefficient is associated with the second polarization direction; and transmitting the at least two space-frequency combination coefficients.

In one embodiment, the terminal device generates a CSI report, the CSI report containing at least two bit maps indicating the positions of space-frequency combining coefficients; the at least two bitmaps are associated with a first spatial layer; wherein at least one of the at least two bit patterns associated with the first spatial layer is associated with a first polarization direction, another bit pattern is associated with a second polarization direction, and at least 1 bit value of the bit pattern associated with the first polarization direction is 1 and at least 1 bit value of the bit pattern associated with the second polarization direction is 1.

Optionally, the CSI report further comprises at least two bitmaps associated with the second spatial layer; wherein at least one of the at least two bit patterns associated with the second empty space layer is associated with a first polarization direction, the other bit pattern is associated with a second polarization direction, and at least 1 bit value in the bit pattern associated with the first polarization direction is 1 and at least 1 bit value in the bit pattern associated with the second polarization direction is 1.

Optionally, at least one of the bit patterns associated with the same spatial layer direction is associated with a first polarization direction and another bit pattern is associated with a second polarization direction; and at least a 1-bit value in the bitmap associated with the first polarization direction is 1 and at least a 1-bit value in the bitmap associated with the second polarization direction is 1.

In one embodiment, a terminal device generates a CSI report, the CSI report comprising a plurality of bitmaps; each bitmap being associated with a spatial layer; the number of bitmaps associated with the same spatial layer is at least 2; and at least one of the bitmaps associated with the same spatial layer is associated with a first polarization direction and another bitmap is associated with a second polarization direction; and at least a 1-bit value in the bitmap associated with the first polarization direction is 1 and at least a 1-bit value in the bitmap associated with the second polarization direction is 1.

In step 520, the terminal device sends the at least two space-frequency combining coefficients to the network device; correspondingly, the network device receives the at least two space-frequency combination coefficients sent by the terminal device.

In one embodiment, a network device receives a CSI report, the CSI report comprising at least two bit maps indicating positions of space-frequency combining coefficients; the at least two bitmaps are associated with a first spatial layer; wherein at least one of the at least two bit patterns associated with the first spatial layer is associated with a first polarization direction, another bit pattern is associated with a second polarization direction, and at least 1 bit value of the bit pattern associated with the first polarization direction is 1 and at least 1 bit value of the bit pattern associated with the second polarization direction is 1.

In one embodiment, a network device receives a CSI report, the CSI report comprising a plurality of bitmaps; each bitmap being associated with a spatial layer; the number of bitmaps associated with the same spatial layer is at least 2; and at least one of the bitmaps associated with the same spatial layer is associated with a first polarization direction and another bitmap is associated with a second polarization direction; and at least a 1-bit value in the bitmap associated with the first polarization direction is 1 and at least a 1-bit value in the bitmap associated with the second polarization direction is 1.

In step 530, the network device determines a precoding matrix according to the at least two space-frequency combining coefficients.

As shown in fig. 7, for example, the spatial layer has a spatial basis vector number L of 4 and a frequency basis vector number M of 4 for each polarization direction. The network device configures the maximum number of reported merging coefficients K0 ═ 1/8 × (2 × L) × (4) for the spatial layer. As shown in fig. 7, L-4 space-domain basis vectors and M-4 frequency-domain basis vectors correspond to 2 LM-32 space-frequency combining coefficients in total in 2 polarization directions, wherein the smaller the amplitude value is corresponding to the space-frequency combining coefficient with the larger index value. The terminal device only reports 4 merging coefficients. The reporting rule needs to satisfy that at least one combining coefficient is reported in the combining coefficients reported by the UE in the polarization direction not including the strongest combining coefficient. Accordingly, in the polarization direction not containing the strongest combining coefficient, there is at least one 1 in the bitmap indicating the position of the combining coefficient. As shown in fig. 4, sorted according to the magnitude values of the combining coefficients, the strongest K0-4 combining coefficients are all located in the polarization direction 1, and in order to improve the system performance, i need to restrict at least one combining coefficient to be reported in the polarization direction 2. Therefore, the finally reported combining coefficients are combining

coefficients

1,2,3, 5. Correspondingly, in part2 of the CSI report, which is used to indicate the bitmap of the reported space-frequency combining coefficient position corresponding to the space layer, 1 bit exists in the bitmap corresponding to the second polarization direction and takes the value of 1.

By further introducing a reporting rule, each polarization direction corresponding to each spatial layer is required to have at least one merging coefficient to report. Therefore, extreme implementation behaviors of the terminal equipment are avoided while the terminal equipment is provided with flexibility, and at least one airspace beam can be ensured to be used in one polarization direction, so that the serious performance loss caused by the implementation of the terminal equipment is avoided.

The vector indication method for constructing a precoding vector according to the embodiment of the present application is described in detail above with reference to fig. 2 to 7. Hereinafter, a communication device according to an embodiment of the present application will be described in detail with reference to fig. 8 to 10.

Fig. 8 is a schematic block diagram of a communication device provided in an embodiment of the present application. As shown, the communication device 600 may include a processing unit 610 and a communication unit 620.

In one possible design, the communication apparatus 600 may correspond to the terminal device in the above method embodiment, and may be, for example, the terminal device or a chip configured in the terminal device.

Specifically, the communication apparatus 600 may correspond to the terminal device in the method 200 according to the embodiment of the present application, and the communication apparatus 600 may include a unit for executing the method executed by the terminal device in the method 200 in fig. 2. Also, the units and other operations and/or functions described above in the communication apparatus 1000 are respectively for implementing the corresponding flows of the method 200 in fig. 2, the method 300 in fig. 4, the method 400 in fig. 5, or the method 500 in fig. 6.

Wherein, when the communication device 1000 is used to execute the method 200 in fig. 2, the communication unit 600 may be used to execute the step 220 in the method 200, and the processing unit 1200 may be used to execute the step 210 in the method 200. It should be understood that the specific processes of the units for executing the corresponding steps are already described in detail in the above method embodiments, and therefore, for brevity, are not described herein again.

When the communication device 600 is configured to perform the method 300 of fig. 4, the communication unit 620 may be configured to perform the step 320 of the method 300, and the processing unit 610 may be configured to perform the step 310 of the method 300. It should be understood that the specific processes of the units for executing the corresponding steps are already described in detail in the above method embodiments, and therefore, for brevity, are not described herein again.

When the communication device 600 is configured to perform the method 400 of fig. 5, the communication unit 620 may be configured to perform the step 420 of the method 400, and the processing unit 610 may be configured to perform the step 410 of the method 400. It should be understood that the specific processes of the units for executing the corresponding steps are already described in detail in the above method embodiments, and therefore, for brevity, are not described herein again.

When the communication device 600 is configured to perform the method 500 of fig. 6, the communication unit 620 may be configured to perform the step 520 of the method 500, and the processing unit 610 may be configured to perform the step 510 of the method 500. It should be understood that the specific processes of the units for executing the corresponding steps are already described in detail in the above method embodiments, and therefore, for brevity, are not described herein again.

It should also be understood that when the communication apparatus 600 is a terminal device, the communication unit 620 in the communication apparatus 600 may correspond to the transceiver 720 in the terminal device 700 shown in fig. 9, and the processing unit 610 in the communication apparatus 600 may correspond to the processor 710 in the terminal device 700 shown in fig. 9.

It should also be understood that when the communication device 600 is a chip configured in a terminal equipment, the communication unit 610 in the communication device 600 may be an input/output interface.

In another possible design, the communication apparatus 600 may correspond to the network device in the above method embodiment, and for example, may be the network device or a chip configured in the network device.

Specifically, the communication apparatus 600 may correspond to the network device in the method 200 according to the embodiment of the present application, and the communication apparatus 600 may include a unit for executing the method executed by the network device in the method 200 in fig. 2. Also, the units in the communication apparatus 600 and the other operations and/or functions described above are respectively for implementing the corresponding flows or in the method 200 in fig. 2, the method 300 in fig. 4, the method 400 in fig. 5, or the method 500 in fig. 6.

Wherein, when the communication device 600 is used to execute the method 200 in fig. 2, the communication unit 620 may be used to execute the step 220 in the method 200, and the processing unit 610 may be used to execute the step 230 in the method 200. It should be understood that the specific processes of the units to perform the above respective steps have been described in detail in the above method embodiments, and are not described herein for brevity.

When the communication device 600 is configured to perform the method 300 of fig. 4, the communication unit 620 may be configured to perform the step 320 of the method 300, and the processing unit 610 may be configured to perform the step 330 of the method 300. It should be understood that the specific processes of the units for executing the corresponding steps are already described in detail in the above method embodiments, and therefore, for brevity, are not described herein again.

When the communication device 600 is configured to perform the method 400 of fig. 5, the communication unit 620 may be configured to perform the step 420 of the method 400, and the processing unit 610 may be configured to perform the step 430 of the method 400. It should be understood that the specific processes of the units for executing the corresponding steps are already described in detail in the above method embodiments, and therefore, for brevity, are not described herein again.

When the communication device 600 is configured to perform the method 500 of fig. 6, the communication unit 620 may be configured to perform step 520 of the method 500, and the processing unit 610 may be configured to perform step 530 of the method 500. It should be understood that the specific processes of the units for executing the corresponding steps are already described in detail in the above method embodiments, and therefore, for brevity, are not described herein again.

It should also be understood that when the communication apparatus 600 is a network device, the communication unit 620 in the communication apparatus 600 is an RRU810 that can correspond to the network device 800 shown in fig. 10, and the processing unit 610 in the communication apparatus 600 can correspond to the BBU820 in the network device 800 shown in fig. 10.

It should also be understood that when the communication device 600 is a chip configured in a network device, the communication unit 610 in the communication device 600 may be an input/output interface.

Fig. 9 is a schematic structural diagram of a terminal device 700 according to an embodiment of the present application. The terminal device 700 can be applied to the system shown in fig. 1, and performs the functions of the terminal device in the above method embodiment. As shown, the terminal device 700 includes a processor 710 and a transceiver 720. Optionally, the terminal device 700 further comprises a memory 730. The processor 710, the transceiver 720 and the memory 730 can communicate with each other via the internal connection path to transmit control and/or data signals, the memory 730 is used for storing a computer program, and the processor 710 is used for calling and running the computer program from the memory 730 to control the transceiver 720 to transmit and receive signals. Optionally, the terminal device 700 may further include an antenna 740, configured to send uplink data or uplink control signaling output by the transceiver 720 by using a wireless signal.

The processor 710 and the memory 730 may be combined into a processing device, and the processor 710 is configured to execute the program codes stored in the memory 730 to implement the functions described above. In particular implementations, the memory 730 may be integrated with the processor 710 or may be separate from the processor 710. The processor 710 may correspond to the processing unit 610 of fig. 7.

The transceiver 720 may correspond to the communication unit 620 in fig. 8, and may also be referred to as a transceiving unit. The transceiver 720 may include a receiver (or receiver, receiving circuit) and a transmitter (or transmitter, transmitting circuit). Wherein the receiver is configured to receive signals and the transmitter is configured to transmit signals.

It should be understood that the terminal device 700 shown in fig. 9 is capable of implementing various processes involving the terminal device in the method embodiments shown in fig. 2, 4 or 5. The operations and/or functions of the modules in the terminal device 700 are respectively for implementing the corresponding flows in the above-described method embodiments. Reference may be made specifically to the description of the above method embodiments, and a detailed description is appropriately omitted herein to avoid redundancy.

The processor 710 may be configured to perform the actions described in the previous method embodiments that are implemented inside the terminal device, and the transceiver 720 may be configured to perform the actions described in the previous method embodiments that the terminal device transmits to or receives from the network device. Please refer to the description of the previous embodiment of the method, which is not repeated herein.

Optionally, the terminal device 700 may further include a power supply 750 for supplying power to various devices or circuits in the terminal device.

In addition, in order to further improve the functions of the terminal device, the terminal device 700 may further include one or more of an input unit 760, a display unit 770, an audio circuit 780, a camera 790, a sensor 791, and the like, and the audio circuit may further include a speaker 782, a microphone 784, and the like.

Fig. 10 is a schematic structural diagram of a network device provided in the embodiment of the present application, which may be a schematic structural diagram of a base station, for example. The base station 800 can be applied to the system shown in fig. 1, and performs the functions of the network device in the above method embodiment. As shown, the base station 800 may include one or more radio frequency units, such as a Remote Radio Unit (RRU) 810 and one or more baseband units (BBUs) (which may also be referred to as Distributed Units (DUs)) 820. The RRU810 may be referred to as a transceiver unit, and corresponds to the communication unit 620 in fig. 8. Alternatively, the transceiver unit 810 may also be referred to as a transceiver, a transceiving circuit, a transceiver, or the like, which may include at least one antenna 811 and a radio frequency unit 812. Alternatively, the transceiver 810 may include a receiving unit and a transmitting unit, the receiving unit may correspond to a receiver (or receiver, receiving circuit), and the transmitting unit may correspond to a transmitter (or transmitter, transmitting circuit). The RRU810 is mainly used for transceiving and converting radio frequency signals and baseband signals, for example, for sending indication information to a terminal device. The BBU820 is mainly used for performing baseband processing, controlling a base station, and the like. The RRU810 and the BBU820 may be physically disposed together or may be physically disposed separately, i.e., distributed base stations.

The BBU820 is a control center of a base station, and may also be referred to as a processing unit, and may correspond to the processing unit 610 in fig. 8, and is mainly used for completing baseband processing functions, such as channel coding, multiplexing, modulation, spreading, and the like. For example, the BBU (processing unit) may be configured to control the base station to perform an operation procedure related to the network device in the foregoing method embodiment, for example, to generate the foregoing indication information.

In an example, the BBU820 may be formed by one or more boards, and the boards may collectively support a radio access network of a single access system (e.g., an LTE network), or may respectively support radio access networks of different access systems (e.g., an LTE network, a 5G network, or other networks). The BBU 3200 also includes a memory 821 and a processor 822. The memory 821 is used for storing necessary instructions and data. The processor 822 is configured to control the base station to perform necessary actions, for example, to control the base station to perform the operation procedure related to the network device in the above method embodiment. The memory 821 and the processor 822 may serve one or more boards. That is, the memory and processor may be provided separately on each board. Multiple boards may share the same memory and processor. In addition, each single board can be provided with necessary circuits.

It should be appreciated that the base station 800 shown in fig. 10 is capable of implementing various processes involving network devices in the method embodiments of fig. 2, 4 or 5. The operations and/or functions of the respective modules in the base station 800 are respectively for implementing the corresponding flows in the above-described method embodiments. In particular, reference may be made to the description of the above method embodiments, and a detailed description is appropriately omitted herein to avoid redundancy.

The BBU820 described above can be used to perform actions described in the foregoing method embodiments that are implemented inside the network device, and the RRU810 can be used to perform actions described in the foregoing method embodiments that the network device sends to or receives from the terminal device. Please refer to the description of the previous embodiment of the method, which is not repeated herein.

The embodiment of the application also provides a processing device, which comprises a processor and an interface; the processor is configured to perform the method of communication in any of the above method embodiments.

It should be understood that the processing means may be a chip. For example, the processing device may be a Field Programmable Gate Array (FPGA), an Application Specific Integrated Circuit (ASIC), a system on chip (SoC), a Central Processing Unit (CPU), a Network Processor (NP), a digital signal processing circuit (DSP), a Micro Controller Unit (MCU), a Programmable Logic Device (PLD) or other integrated chips.

In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in a processor or instructions in the form of software. The steps of a method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in a processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in a memory, and a processor reads information in the memory and completes the steps of the method in combination with hardware of the processor. To avoid repetition, it is not described in detail here.

It should be noted that the processor in the embodiments of the present application may be an integrated circuit chip having signal processing capability. In implementation, the steps of the above method embodiments may be performed by instructions in the form of integrated logic circuits of hardware or software in a processor. The processor described above may be a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components. The methods, steps and logic blocks disclosed in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in a memory, and a processor reads information in the memory and completes the steps of the method in combination with hardware of the processor.

It will be appreciated that the memory in the embodiments of the subject application can be either volatile memory or nonvolatile memory, or can include both volatile and nonvolatile memory. The non-volatile memory may be a read-only memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an electrically Erasable EPROM (EEPROM), or a flash memory. Volatile memory can be Random Access Memory (RAM), which acts as external cache memory. By way of example, but not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic Random Access Memory (SDRAM), double data rate SDRAM, enhanced SDRAM, SLDRAM, Synchronous Link DRAM (SLDRAM), and direct rambus RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

According to the method provided by the embodiment of the present application, the present application further provides a computer program product, which includes: computer program code which, when run on a computer, causes the computer to perform the method of any one of the embodiments shown in figures 2, 4 and 5.

There is also provided a computer readable medium having program code stored thereon, which when run on a computer causes the computer to perform the method of any one of the embodiments shown in fig. 2, 4 and 5, according to the method provided by the embodiments of the present application.

According to the method provided by the embodiment of the present application, the present application further provides a system, which includes the foregoing one or more terminal devices and one or more network devices.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the application to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored on a computer readable storage medium or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a Digital Video Disk (DVD)), or a semiconductor medium (e.g., a Solid State Disk (SSD)), among others.

The network device in the foregoing various apparatus embodiments completely corresponds to the terminal device and the network device or the terminal device in the method embodiments, and the corresponding steps are executed by corresponding modules or units, for example, a communication unit (transceiver) executes the steps of receiving or transmitting in the method embodiments, and other steps besides transmitting and receiving may be executed by a processing unit (processor). The functions of the specific elements may be referred to in the respective method embodiments. The number of the processors may be one or more.

As used in this specification, the terms "component," "module," "system," and the like are intended to refer to a computer-related entity, either hardware, firmware, a combination of hardware and software, or software in execution. For example, a component may be, but is not limited to being, a process running on a processor, an object, an executable, a thread of execution, a program, and/or a computer. By way of illustration, both an application running on a computing device and the computing device can be a component. One or more components can reside within a process and/or thread of execution and a component can be localized on one computer and/or distributed between 2 or more computers. In addition, these components can execute from various computer readable media having various data structures stored thereon. The components may communicate by way of local and/or remote processes such as in accordance with a signal having one or more data packets (e.g., data from two components interacting with another component in a local system, distributed system, and/or across a network such as the internet with other systems by way of the signal).

Those of ordinary skill in the art will appreciate that the various illustrative logical blocks and steps (step) described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

In the above embodiments, the functions of the functional units may be fully or partially implemented by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions (programs). The procedures or functions described in accordance with the embodiments of the present application are generated in whole or in part when the computer program instructions (programs) are loaded and executed on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website site, computer, server, or data center to another website site, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and all the changes or substitutions should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method for indicating channel state information, CSI, comprising:

generating a CSI report, the CSI report comprising at least a first portion, the first portion comprising R fields, R being a predefined maximum number of spatial layers; the R fields are used to indicate whether there is a space-frequency combining coefficient reported in a first polarization direction corresponding to each spatial layer in the R spatial layers, where the first polarization direction is a polarization direction other than the polarization direction in which the first space-frequency combining coefficient in each spatial layer is located, and the first space-frequency combining coefficient is a space-frequency combining coefficient with a largest amplitude value among the space-frequency combining coefficients reported in each spatial layer; r is an integer greater than or equal to 1;

and sending the CSI report.

2. A method for indicating channel state information, CSI, comprising:

receiving a CSI report, the CSI report comprising at least a first portion, the first portion comprising R fields, R being a predefined maximum number of spatial layers; the R fields are used to indicate whether there is a space-frequency combining coefficient reported in a first polarization direction corresponding to each spatial layer in the R spatial layers, where the first polarization direction is a polarization direction other than the polarization direction in which the first space-frequency combining coefficient in each spatial layer is located, and the first space-frequency combining coefficient is a space-frequency combining coefficient with a largest amplitude value among the space-frequency combining coefficients reported in each spatial layer; r is an integer greater than or equal to 1;

and determining precoding matrixes corresponding to the Q spatial layers according to the first part, wherein Q is the number of the spatial layers indicated by the Rank Indication (RI) in the first part.

3. A communications apparatus, comprising:

a processing module to generate a CSI report, the CSI report including at least a first portion, the first portion including R fields, R being a predefined maximum number of spatial layers; the R fields are used to indicate whether there is a space-frequency combining coefficient reported in a first polarization direction corresponding to each spatial layer in the R spatial layers, where the first polarization direction is a polarization direction other than the polarization direction in which the first space-frequency combining coefficient in each spatial layer is located, and the first space-frequency combining coefficient is a space-frequency combining coefficient with a largest amplitude value among the space-frequency combining coefficients reported in each spatial layer; r is an integer greater than or equal to 1;

a communication module for transmitting the CSI report.

4. A communications apparatus, comprising:

a communication module to receive a CSI report, the CSI report including at least a first portion, the first portion including R fields, R being a predefined maximum number of spatial layers; the R fields are used to indicate whether there is a space-frequency combining coefficient reported in a first polarization direction corresponding to each spatial layer in the R spatial layers, where the first polarization direction is a polarization direction other than the polarization direction in which the first space-frequency combining coefficient in each spatial layer is located, and the first space-frequency combining coefficient is a space-frequency combining coefficient with a largest amplitude value among the space-frequency combining coefficients reported in each spatial layer; r is an integer greater than or equal to 1;

and a processing module, configured to determine precoding matrices corresponding to the Q spatial layers according to the first portion, where Q is the number of spatial layers indicated by the rank indication RI in the first portion.

5. The method according to claim 1 or 2, or the apparatus according to claim 3 or 4, wherein the CSI further includes a second part, the second part includes P fields, P is the number of spatial layers of the Q spatial layers that have no space-frequency combining coefficient reporting in the first polarization direction, and an mth field of the P fields is used to indicate the polarization direction of the first space-frequency combining coefficient in the mth spatial layer that has no space-frequency combining coefficient reporting in the first polarization direction; q is more than or equal to P and more than or equal to 1, m is more than or equal to 1 and less than or equal to P, and m and P are integers.

6. The method or apparatus according to claim 5, wherein the second portion further includes L × M bits, and the L × M bits are used to indicate a position of the space-frequency combining coefficient reported in a polarization direction in which the first combining coefficient is located in the M spatial layers; and L and M are respectively the number of space domain basis vectors and the number of frequency domain basis vectors in the space layer reported by the mth space-frequency combination coefficient in the first polarization direction, and both L and M are positive integers.

7. The method or apparatus of claim 5 or 6, wherein in the case that (Q-P) is greater than 0, the second portion further comprises quantized reference amplitudes corresponding to each of the (Q-P) spatial layers.

8. A method for indicating channel state information, CSI, comprising:

generating a CSI report, where the CSI report at least includes a first part, where the first part includes first indication information, where the first indication information is used to indicate a number of spatial layers that have no space-frequency combination coefficient reported in a first polarization direction, where the number is less than or equal to a predefined maximum number R of spatial layers, the first polarization direction is a polarization direction other than a polarization direction in which a first space-frequency combination coefficient in each of the R spatial layers is located, and the first space-frequency combination coefficient is a space-frequency combination coefficient with a maximum amplitude value among the space-frequency combination coefficients reported in each of the spatial layers; r is an integer greater than or equal to 1;

and sending the CSI report.

9. A method for indicating channel state information, CSI, comprising:

receiving a CSI report, where the CSI report at least includes a first part, where the first part includes first indication information, where the first indication information is used to indicate a number of spatial layers that have no space-frequency combination coefficient reported in a first polarization direction, where the number is less than or equal to a predefined maximum number R of spatial layers, the first polarization direction is a polarization direction other than a polarization direction in which a first space-frequency combination coefficient in each of the R spatial layers is located, and the first space-frequency combination coefficient is a space-frequency combination coefficient with a maximum amplitude value among the space-frequency combination coefficients reported in each of the spatial layers; r is an integer greater than or equal to 1;

10. A communications apparatus, comprising:

a processing module, configured to generate a CSI report, where the CSI report at least includes a first part, where the first part includes first indication information, where the first indication information is used to indicate a number of spatial layers that have no space-frequency combination coefficient reported in a first polarization direction, where the number is less than or equal to a predefined maximum number R of spatial layers, the first polarization direction is a polarization direction other than a polarization direction in which a first space-frequency combination coefficient in each of the R spatial layers is located, and the first space-frequency combination coefficient is a space-frequency combination coefficient with a largest amplitude value among space-frequency combination coefficients reported in each of the R spatial layers; r is an integer greater than or equal to 1;

a communication module for transmitting the CSI report.

11. A communications apparatus, comprising:

a communication module, configured to receive a CSI report, where the CSI report at least includes a first part, where the first part includes first indication information, where the first indication information is used to indicate a number of spatial layers that have no space-frequency combination coefficient reported in a first polarization direction, where the number is less than or equal to a predefined maximum number R of spatial layers, the first polarization direction is a polarization direction other than a polarization direction in which a first space-frequency combination coefficient in each of the R spatial layers is located, and the first space-frequency combination coefficient is a space-frequency combination coefficient with a largest amplitude value among space-frequency combination coefficients reported in each of the R spatial layers; r is an integer greater than or equal to 1;

12. The method according to claim 8 or 9, or the apparatus according to claim 10 or 11, wherein the CSI report further includes a second portion including second indication information indicating whether each of the Q spatial layers has an empty frequency combining coefficient reporting in the first polarization direction.

13. The method or apparatus according to claim 12, wherein the second portion further includes K bits, where K is a number of spatial layers where no space-frequency combining coefficient is reported in the first polarization direction, and an nth bit of the K bits is used to indicate a polarization direction of the first combining coefficient in an nth spatial layer where no space-frequency combining coefficient is reported in the first polarization direction; q is more than or equal to K and more than or equal to 1, n is more than or equal to 1 and less than or equal to K, and K and n are integers.

14. The method or apparatus of claim 13, wherein the second portion further comprises L₁*M₁One bit, the L₁*M₁One bit for indicating the polarization direction of the first combining coefficient in the nth spatial layerReporting the position of the space-frequency merging coefficient; l is₁And M₁The number of space domain basis vectors and the number of frequency domain basis vectors in the spatial layer reported by the nth space-frequency combination coefficient in the first polarization direction, L₁And M₁Are all positive integers.

15. Method or device according to claim 13 or 14, wherein in case (Q-K) is greater than 0, the second part further comprises 2 x L₂*M₂A bit of 2 x L₂*M₂The bit is used for indicating the position of a space-frequency merging coefficient reported by a jth space layer in the (Q-K) space layers in the first polarization direction, wherein j is more than or equal to 1 and less than or equal to (Q-K), and j is an integer; l is₂And M₂The number of space domain basis vectors and the number of frequency domain basis vectors, L, in the space layer reported by the jth space-frequency merging coefficient in the first polarization direction are respectively₂And M₂Are all positive integers.

16. The method according to any one of claims 8, 9, 13-15, or the apparatus according to any one of claims 10, 11, 13-15, wherein the overhead of the first indication information is

17. A method for indicating channel state information, CSI, comprising:

generating a CSI report, the CSI report comprising at least a first portion, the first portion comprising R fields, R being a predefined maximum number of spatial layers; the R fields are used for indicating the number of first space-domain basis vectors in a space-frequency merging coefficient matrix corresponding to each space layer in the R space layers, wherein the first space-domain basis vectors are space-domain basis vectors reported by merging coefficients in the space-frequency merging coefficient matrix, or the first space-domain basis vectors are space-domain basis vectors reported by no merging coefficients in the space-frequency merging coefficient matrix; r is an integer greater than or equal to 1;

and sending the CSI report.

18. A method for indicating channel state information, CSI, comprising:

receiving a CSI report, the CSI report comprising at least a first portion, the first portion comprising R fields, R being a predefined maximum number of spatial layers; the R fields are used for indicating the number of first space-domain basis vectors in a space-frequency merging coefficient matrix corresponding to each space layer in the R space layers, wherein the first space-domain basis vectors are space-domain basis vectors reported by merging coefficients in the space-frequency merging coefficient matrix, or the first space-domain basis vectors are space-domain basis vectors reported by no merging coefficients in the space-frequency merging coefficient matrix; r is an integer greater than or equal to 1;

19. A communications apparatus, comprising:

a processing module to generate a CSI report, the CSI report comprising at least a first portion, the first portion comprising R fields, R being a predefined maximum number of spatial layers; the R fields are used for indicating the number of first space-domain basis vectors in a space-frequency merging coefficient matrix corresponding to each space layer in the R space layers, wherein the first space-domain basis vectors are space-domain basis vectors reported by merging coefficients in the space-frequency merging coefficient matrix, or the first space-domain basis vectors are space-domain basis vectors reported by no merging coefficients in the space-frequency merging coefficient matrix; r is an integer greater than or equal to 1;

a communication module for transmitting the CSI report.

20. A communications apparatus, comprising:

a communication module to receive a CSI report, the CSI report comprising at least a first portion, the first portion comprising R fields, R being a predefined maximum number of spatial layers; the R fields are used for indicating the number of first space-domain basis vectors in a space-frequency merging coefficient matrix corresponding to each space layer in the R space layers, wherein the first space-domain basis vectors are space-domain basis vectors reported by merging coefficients in the space-frequency merging coefficient matrix, or the first space-domain basis vectors are space-domain basis vectors reported by no merging coefficients in the space-frequency merging coefficient matrix; r is an integer greater than or equal to 1;

21. The method according to claim 17 or 18, or the apparatus according to claim 19 or 20, wherein the CSI report further comprises a second part, the second part comprises Y fields, Y being the number of spatial layers with spatial basis vectors without combining coefficient reporting among the Q spatial layers; the ith field in the Y fields is used for indicating the index of the spatial domain base vector reported without the merging coefficient in the spatial layer corresponding to the spatial domain base vector reported without the merging coefficient in the ith field; q is more than or equal to Y and more than or equal to 1, i is more than or equal to 1 and less than or equal to Y, and Y and i are integers.

22. The method or apparatus of claim 21, wherein the bit overhead of the ith field is

Wherein 2L is the number of the space domain basis vectors in the first polarization direction and the second polarization direction in the space layer corresponding to the space domain basis vector reported by the ith space-frequency-free merging coefficient, and Z_iThe number of the space domain basis vectors reported by the merging coefficients in the 2L space domain basis vectors is shown.

23. The method or apparatus of claim 22, wherein the second portion further comprises Z_iM bits, said Z_iM bits are used to indicate the position of the space-frequency combining coefficient reported by the spatial layer corresponding to the space-domain basis vector with the ith reported coefficient, where M is the number of frequency-domain basis vectors in the spatial layer with the ith reported coefficient.

24. The method or apparatus of claim 21, wherein the bit overhead of the ith field is

Wherein L is the number of the space-domain basis vectors in the space layer corresponding to the space-domain basis vector reported by the ith space-frequency-free merging coefficient, and Z_iAnd the number of the space domain basis vectors reported by the merging coefficients in the L-th space domain basis vector in the first polarization direction and the second polarization direction is determined.

25. A method or apparatus according to claim 24, in which the second part further comprises 2 x Z_iM bits, 2X Z_iAnd M bits are used for indicating the position of the space-frequency merging coefficient reported by the spatial layer corresponding to the space-frequency basis vector reported by the ith space-frequency basis vector without merging coefficient, and M is the number of the frequency-domain basis vectors in the spatial layer reported by the ith space-frequency basis vector without merging coefficient.

26. A method of communication, comprising:

determining at least two space-frequency merging coefficients; wherein at least one space-frequency combining coefficient is associated with a first polarization direction; and at least one space-frequency combining coefficient is associated with the second polarization direction;

and transmitting the at least two space-frequency combination coefficients.

27. A method of communication, comprising:

receiving at least two space-frequency merging coefficients; wherein at least one space-frequency combining coefficient is associated with a first polarization direction; and at least one space-frequency combining coefficient is associated with the second polarization direction;

and determining a precoding matrix according to the at least two space-frequency combination coefficients.

28. A communications apparatus, comprising:

the processing module is used for determining at least two space-frequency merging coefficients; wherein at least one space-frequency combining coefficient is associated with a first polarization direction; and at least one space-frequency combining coefficient is associated with the second polarization direction;

and the communication module is used for sending the at least two space-frequency combination coefficients.

29. A communications apparatus, comprising:

the communication module is used for receiving at least two space-frequency merging coefficients; wherein at least one space-frequency combining coefficient is associated with a first polarization direction; and at least one space-frequency combining coefficient is associated with the second polarization direction;

and the processing module is used for determining a precoding matrix according to the at least two space-frequency combination coefficients.

30. A method of communication, comprising:

generating a CSI report containing at least two bit maps indicating positions of space-frequency combining coefficients; the at least two bitmaps are associated with a first spatial layer; wherein at least one of the at least two bit maps associated with the first spatial layer is associated with a first polarization direction, the other bit map is associated with a second polarization direction, and at least 1 bit value of the bit map associated with the first polarization direction is 1 and at least 1 bit value of the bit map associated with the second polarization direction is 1;

and sending the CSI report.

31. A method of communication, comprising:

receiving a CSI report, wherein the CSI report comprises at least two bit maps which indicate the positions of space-frequency merging coefficients; the at least two bitmaps are associated with a first spatial layer; wherein at least one of the at least two bit maps associated with the first spatial layer is associated with a first polarization direction, the other bit map is associated with a second polarization direction, and at least 1 bit value of the bit map associated with the first polarization direction is 1 and at least 1 bit value of the bit map associated with the second polarization direction is 1;

and determining a precoding matrix according to the CSI report.

32. A communications apparatus, comprising:

a processing module for generating a CSI report, the CSI report comprising at least two bit maps indicating positions of space-frequency combining coefficients; the at least two bitmaps are associated with a first spatial layer; wherein at least one of the at least two bit maps associated with the first spatial layer is associated with a first polarization direction, the other bit map is associated with a second polarization direction, and at least 1 bit value of the bit map associated with the first polarization direction is 1 and at least 1 bit value of the bit map associated with the second polarization direction is 1;

a communication module for transmitting the CSI report.

33. A communications apparatus, comprising:

a communication module for receiving a CSI report, the CSI report comprising at least two bit maps indicating positions of space-frequency combining coefficients; the at least two bitmaps are associated with a first spatial layer; wherein at least one of the at least two bit patterns associated with the first spatial layer is associated with a first polarization direction, another bit pattern is associated with a second polarization direction, and at least 1 bit value in the bit pattern associated with the first polarization direction is 1 and at least 1 bit value in the bit pattern associated with the second polarization direction is 1;

and the processing module is used for determining a precoding matrix according to the CSI report.

34. The method according to claim 30 or 31, or the apparatus according to claim 32 or 33, wherein the CSI report further comprises at least two bitmap associated with the second spatial layer; wherein at least one of the at least two bit patterns associated with the second spatial layer is associated with the first polarization direction, another bit pattern is associated with the second polarization direction, and at least 1 bit value of the bit pattern associated with the first polarization direction is 1 and at least 1 bit value of the bit pattern associated with the second polarization direction is 1.

35. Method according to claim 30, 31 or 34 or apparatus according to any of claims 32-34, characterized in that of the bitmaps associated to the same spatial hierarchy, at least one bitmap is associated to the first polarization direction and another bitmap is associated to the second polarization direction; and at least a 1-bit value in the bitmap associated with the first polarization direction is 1 and at least a 1-bit value in the bitmap associated with the second polarization direction is 1.

36. A method of communication, comprising:

generating a CSI report, the CSI report comprising a plurality of bitmaps; each bitmap being associated with a spatial layer; the number of bitmaps associated with the same spatial layer is at least 2; and at least one of the bitmaps associated with the same spatial layer is associated with a first polarization direction and another bitmap is associated with a second polarization direction; and at least a 1-bit value in the bitmap associated with the first polarization direction is 1, and at least a 1-bit value in the bitmap associated with the second polarization direction is 1;

and sending the CSI report.

37. A method of communication, comprising:

receiving a CSI report, the CSI report comprising a plurality of bitmaps; each bitmap being associated with a spatial layer; the number of bitmaps associated with the same spatial layer is at least 2; and at least one of the bitmaps associated with the same spatial layer is associated with a first polarization direction and another bitmap is associated with a second polarization direction; and at least a 1-bit value in the bitmap associated with the first polarization direction is 1, and at least a 1-bit value in the bitmap associated with the second polarization direction is 1;

and determining a precoding matrix according to the CSI report.

38. A communications apparatus, comprising:

a processing module to generate a CSI report, the CSI report comprising a plurality of bitmaps; each bitmap being associated with a spatial layer; the number of bitmaps associated with the same spatial layer is at least 2; and at least one of the bitmaps associated with the same spatial layer is associated with a first polarization direction and another bitmap is associated with a second polarization direction; and at least a 1-bit value in the bitmap associated with the first polarization direction is 1, and at least a 1-bit value in the bitmap associated with the second polarization direction is 1;

a communication module for transmitting the CSI report.

39. A communications apparatus, comprising:

a communication module to receive a CSI report, the CSI report comprising a plurality of bitmaps; each bitmap being associated with a spatial layer; the number of bitmaps associated with the same spatial layer is at least 2; and at least one of the bitmaps associated with the same spatial layer is associated with a first polarization direction and another bitmap is associated with a second polarization direction; and at least a 1-bit value in the bitmap associated with the first polarization direction is 1, and at least a 1-bit value in the bitmap associated with the second polarization direction is 1;

40. A communications apparatus comprising at least one processor configured to perform the method of any one of claims 1,2, 5-9, 12-18, 21-27, 30, 31, 34-37.

41. A computer-readable medium, comprising a computer program which, when run on a computer, causes the computer to perform the method of any one of claims 1,2, 5 to 9, 12 to 18, 21 to 27, 30, 31, 34 to 37.