CN111756422A

CN111756422A - Method for indicating channel state information and communication device

Info

Publication number: CN111756422A
Application number: CN201910250029.8A
Authority: CN
Inventors: 高翔; 刘鹍鹏
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-03-29
Filing date: 2019-03-29
Publication date: 2020-10-09
Anticipated expiration: 2039-03-29
Also published as: CN111756422B

Abstract

The application provides a method and a communication device for indicating CSI. The method can be applied to communication systems such as LTE, LTE-A, 5G, V2X, LTE-V, V2V, Internet of vehicles, MTC, IoT, LTE-M, M2M, Internet of things and the like. The method comprises the following steps: generating and transmitting a CSI report, a first portion of the CSI report including at least a plurality of fields of predeterminable overhead for indicating a number of frequency domain vectors reported for each space domain vector on each of R transmission layers, and the plurality of fields jointly indicating a number of transmission layers without requiring a separate RI field to indicate. A second portion of the CSI report may be further decoded based on a plurality of fields of predeterminable overhead designed in the first portion, thereby obtaining a specific indication of the frequency domain vector. Therefore, the network equipment can correctly interpret CSI feedback, ensure the data transmission performance and be adaptive to a codebook feedback mode of double-domain compression.

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.

The terminal device may determine a precoding vector by channel measurement, and hopefully, the network device obtains a precoding vector that is the same as or similar to the precoding vector determined by the terminal device through feedback. In order to reduce the feedback overhead and improve the feedback accuracy, in one implementation, the terminal device may indicate the precoding vector to the network device in a feedback manner combining spatial domain compression and frequency domain compression. Specifically, the terminal device may select one or more spatial vectors and one or more frequency domain vectors based on the precoding vectors of the frequency domain units on each transmission layer to fit the precoding vectors corresponding to the frequency domain units on each transmission layer by a weighted sum of matrices constructed by the spatial vectors and the frequency domain vectors.

However, the design of CSI reports in current protocols is not applicable to the above feedback approach.

Disclosure of Invention

The application provides a method for indicating channel state information and a communication device, which are adapted to a feedback mode of dual-domain compression.

In a first aspect, a method of indicating a precoding vector 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 comprising at least a first portion comprising at least R₀Individual field, R₀A predefined maximum number of transmission layers; the R is₀The field is used for indicating the number of frequency domain vectors reported aiming at each transmission layer in the R transmission layers; the precoding vector of each frequency domain unit on the R transmission layer is constructed according to the frequency domain vector reported by the R transmission layer in the R transmission layers; r₀R is more than or equal to 1, R is more than or equal to 1 and less than or equal to R, and R₀R and R are integers; and sending the CSI report.

In a second aspect, a method of determining a precoding vector 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 comprising at least R ₀Individual field, R₀A predefined maximum number of transmission layers; the R is₀The field is used for indicating the number of frequency domain vectors reported aiming at each transmission layer in the R transmission layers; the precoding vector of each frequency domain unit on the R transmission layer is constructed according to the frequency domain vector reported by the R transmission layer in the R transmission layers; r₀R is more than or equal to 1, R is more than or equal to 1 and less than or equal to R, and R₀R and R are integers; determining the number of transmission layers R and the number of frequency domain vectors reported for each of the R transmission layers according to the first part of the CSI report.

Therefore, based on the above technical solution, the terminal device may determine, through the first part of the CSI report, the number of frequency domain vectors reported by the terminal device for each transmission layer. The network device may decode the frequency domain vectors corresponding to each transmission layer in the second portion according to the number of the frequency domain vectors reported by the first portion for each transmission layer, and further construct precoding vectors corresponding to each frequency domain unit on each transmission layer based on each frequency domain vector and other information reported by the terminal device, such as space-domain vectors and space-frequency combining coefficients. Therefore, the CSI report designed as above can be adapted to the codebook feedback mode of the two-domain compression. Because the CSI fed back by the terminal equipment is determined based on the downlink channel measurement, the CSI can be well adapted to the downlink channel, and therefore the network equipment is facilitated to determine the precoding matrix for data transmission adapted to the downlink channel. Thereby achieving the effect of improving the data transmission performance.

With reference to the first aspect or the second aspect, in some possible implementations, the R₀Each field and R₀The transmission layers correspond to each other; the R is₀Of R fieldsEach field is used for indicating the number of frequency domain vectors reported aiming at one transmission layer; the R is₀Remaining R in the individual field₀-R fields are predefined values representing that no frequency domain vector is reported for the corresponding transport layer; the R is₀The number field is used for implicitly indicating the number of transmission layers R.

By the above-mentioned R₀The fields jointly indicate the number of transmission layers, and the RI field in the existing CSI report can be eliminated, thereby being beneficial to reducing the bit overhead of the first part of the CSI report.

With reference to the first aspect or the second aspect, in some possible implementations, the R₀R in the individual field₀Overhead of a field is

The number of bits is one,

is shown for R₀R in transport layer₀The number of selectable values of the number of the frequency domain vectors reported by each space domain vector on each transmission layer is r which is more than or equal to 1₀≤R₀And r is₀Is an integer which is the number of the whole,

is a positive integer; in said R₀In each transmission layer, the reporting quantity of frequency domain vectors pre-configured for any two space domain vectors on the same transmission layer is the same; the space vector corresponding to the R-th transmission layer of the R transmission layers and the frequency domain vector reported for each space vector on the R-th transmission layer are used for constructing the precoding vector of each frequency domain unit on the R-th transmission layer.

It can be seen that R is₀The bit overhead of a field is independent of the number of transport layers. By designing one or more fields capable of determining bit overhead in advance for the first part, the network equipment can decode the first part according to the bit overhead determined in advance, thereby obtaining the information therein to determine the bit overhead of the second part, and further being capable of positively determining the bit overhead of the second partThe second part is decoded exactly. Through the design, the network equipment can correctly decode the first part and the second part of the CSI report, and further obtain the CSI fed back by the terminal equipment.

In addition, by predefined values

The number of possible values of the frequency domain vector quantity reported by the terminal equipment can be smaller than or equal to the preconfigured frequency domain vector reporting quantity, that is, the frequency domain vector reporting quantity is calculated by the frequency domain vector calculation method

Thereby the bit overhead of the fields can be further reduced.

With reference to the first aspect or the second aspect, in some possible implementations, the R₀R in the individual field₀Each field has

A selectable value, said

Alternative values include for the r < th > value₀Number of frequency domain vectors reported per space domain vector in each transport layer

Seed value and for indicating the value of r₀The individual transport layers do not report 1 value of the frequency domain vector.

Based on each value, the network device may determine whether the terminal device has reported the frequency domain vectors and the number of reported frequency domain vectors for each transport layer.

In combination with the first or second aspect, in some possible implementations,

has a value of

Is represented for the R₀R in transport layer₀Reporting quantity of frequency domain vectors pre-configured for each space domain vector on each transmission layer,

is a positive integer.

In a third aspect, a method of indicating 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 comprising at least a first portion comprising at least T₀+1 fields, T₀Is a predefined maximum number of transport layer groups; the T is₀The +1 field is used for indicating the number of frequency domain vectors reported for each of the R transmission layers; the R transport layers belong to T transport layer groups, each transport layer group comprising one or more of the R transport layers; the precoding vector of each frequency domain unit on the R transmission layer is constructed according to the frequency domain vector reported by the R transmission layer in the R transmission layers; t is ₀More than or equal to T, R is more than or equal to T, R is more than or equal to 1 and less than or equal to R, and T₀T, R and r are all positive integers; and sending the CSI report.

In a fourth aspect, a method of indicating 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 at least T₀+1 fields, T₀Is a predefined maximum number of transport layer groups; the T is₀The +1 field is used for indicating the number of frequency domain vectors reported for each of the R transmission layers; the R transport layers belong to T transport layer groups, each transport layer group comprising one or more of the R transport layers; a frequency domain reported for an R-th transport layer of the R transport layersThe vector is used for constructing a precoding vector of each frequency domain unit on the r transmission layer; t is₀More than or equal to T, R is more than or equal to T, R is more than or equal to 1 and less than or equal to R, and T₀T, R and r are all positive integers; determining the number of transmission layers R and the number of frequency domain vectors reported for each of the R transmission layers according to the first part of the CSI report.

Therefore, based on the above technical solution, the terminal device may determine, through the first part of the CSI report, the number of frequency domain vectors reported by the terminal device for each transmission layer in each transmission layer group. The network device may interpret the frequency domain vectors corresponding to the transmission layers in the second portion according to the number of the frequency domain vectors reported by the transmission layers in each transmission layer group indicated by the first portion, and construct precoding vectors corresponding to the frequency domain units on the transmission layers based on the frequency domain vectors and other information reported by the terminal device, such as space-domain vectors and space-frequency combining coefficients. Therefore, the CSI report designed as above can be adapted to the codebook feedback mode of the two-domain compression. Because the CSI fed back by the terminal equipment is determined based on the downlink channel measurement, the CSI can be well adapted to the downlink channel, and therefore the network equipment is facilitated to determine the precoding matrix for data transmission adapted to the downlink channel. Thereby achieving the effect of improving the data transmission performance.

With reference to the third aspect or the fourth aspect, in some possible implementations, the T₀+1 field comprising and T₀T corresponding to transmission layer group₀A field and an indication field; the T is₀The T fields in the field are used for indicating the number of frequency domain vectors reported by aiming at each transmission layer in each transmission layer group in the T transmission layer groups; the T is₀The rest of T in each field₀-T fields are predefined values representing that no frequency domain vector is reported for the corresponding transmission layer group; the indication field is used for indicating the number of transmission layers of the frequency domain vector reported by aiming at the T transmission layer group in the T transmission layer groups; the T is₀The +1 field is used to implicitly indicate the number of transmission layers R.

Through the above-mentioned T₀+1 field to connectAnd the RI field in the existing CSI report can be cancelled by indicating the number of transmission layers, thereby being beneficial to reducing the bit overhead of the first part of the CSI report.

With reference to the third aspect or the fourth aspect, in some possible implementations, the T₀T-th in the individual field₀Overhead of a field is

The number of bits is one,

representation for T₀T of a group of transmission layers₀The number of the selectable values of the number of the frequency domain vectors reported by each space domain vector on each transmission layer in each transmission layer group,

Is a positive integer; at the T₀In the transmission layers included by the transmission layer groups, the reporting quantity of frequency domain vectors pre-configured aiming at any two space domain vectors on the same transmission layer is the same; the space vector corresponding to the R-th transmission layer of the R transmission layers and the frequency domain vector reported for each space vector on the R-th transmission layer are used for constructing the precoding vector of each frequency domain unit on the R-th transmission layer.

It can be seen that T₀The bit overhead of +1 fields is independent of the number of transport layers. By designing one or more fields capable of determining bit overhead in advance for the first part, the network device can decode the first part according to the bit overhead determined in advance, so as to obtain the information therein to determine the bit overhead of the second part, and then correctly decode the second part. Through the design, the network equipment can correctly decode the first part and the second part of the CSI report, and further obtain the CSI fed back by the terminal equipment.

In addition, by predefined values

The frequency domain vector number reported by the terminal equipment can be enabledThe number of possible values of the quantity may be less than or equal to the number of preconfigured frequency domain vector reports, i.e.,

Thereby the bit overhead of the fields can be further reduced.

With reference to the third aspect or the fourth aspect, in some possible implementations, the T₀T-th in the individual field₀Each field has

A selectable value, said

Alternative values include for the t₀Of the number of frequency domain vectors reported by each of the transmission layer groups

Seed value and for indicating the value for the t₀The transmission layer group does not report 1 value of the frequency domain vector.

Based on each value, the network device may determine whether the terminal device has reported the frequency domain vector for each transmission layer group and the number of the reported frequency domain vectors.

With reference to the third aspect or the fourth aspect, in some possible implementations,

is taken as

Represents for said T₀T of a group of transmission layers₀The reporting quantity of the frequency domain vectors pre-configured by each space domain vector on each transmission layer in each transmission layer group,

is a positive integer.

In combination with the third aspect or the fourth aspect, in some embodimentsIn an implementation manner, the overhead of the indication field is

Bit S is for T₀A maximum number of transmission layers pre-configured for a group of transmission layers, the maximum number of transmission layers representing the number of transmission layers for the T₀And the maximum value of the transmission layer numbers pre-configured by each transmission layer group in the transmission layer groups, wherein S is a positive integer.

Based on the indication bit, the network device may further determine the number of transmission layers for which the frequency domain vector is reported for the tth transmission layer. This indicator field is therefore associated with T as described above₀And a field which can jointly indicate the number of transmission layers, thereby being beneficial to reducing the bit overhead of the first part of the CSI report.

In a fifth aspect, a method of indicating 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, wherein the CSI report at least comprises a first part, and the first part comprises an index value which is used for indicating the number of frequency domain vectors and the number R of transmission layers reported respectively for each of R transmission layers; the index value is taken from a plurality of index values which are pre-configured, the index values correspond to a plurality of parameter groups, and each parameter group comprises one transmission layer number and the reporting number of frequency domain vectors which are pre-configured aiming at each transmission layer; the precoding vector of each frequency domain unit on the R transmission layer is constructed by aiming at the frequency domain vector reported by the R transmission layer in the R transmission layers, wherein R is more than or equal to 1 and less than or equal to R, and R and R are both positive integers; and sending the CSI report.

In a sixth aspect, a method of indicating 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, wherein the CSI report at least comprises a first part, and the first part comprises an index value which is used for indicating the number R of transmission layers and the number of frequency domain vectors reported by each of the R transmission layers; the index value is taken from a plurality of index values which are pre-configured, the index values correspond to a plurality of parameter groups, and each parameter group comprises one transmission layer number and a frequency domain vector reporting number which is pre-configured aiming at each transmission layer; the precoding vector of each frequency domain unit on the R transmission layer is constructed by aiming at the frequency domain vector reported by the R transmission layer in the R transmission layers, wherein R is more than or equal to 1 and less than or equal to R, and R and R are both positive integers; and determining the number of transmission layers R and the number of frequency domain vectors reported for each of the R transmission layers according to the first part of the CSI report.

Therefore, based on the above technical solution, the terminal device may indicate the number of transmission layers and the number of frequency domain vectors reported for each transmission layer in the first part of the CSI report through a pre-configured correspondence between index values and parameter groups. The network device may interpret the frequency domain vectors corresponding to the transmission layers in the second portion according to the number of the frequency domain vectors reported by the transmission layers in each transmission layer group indicated by the first portion, and construct precoding vectors corresponding to the frequency domain units on the transmission layers based on the frequency domain vectors and other information reported by the terminal device, such as space-domain vectors and space-frequency combining coefficients. Therefore, the CSI report designed as above can be adapted to the codebook feedback mode of the two-domain compression. Because the CSI fed back by the terminal equipment is determined based on the downlink channel measurement, the CSI can be well adapted to the downlink channel, and therefore the network equipment is facilitated to determine the precoding matrix for data transmission adapted to the downlink channel. Thereby achieving the effect of improving the data transmission performance.

With reference to the fifth aspect or the sixth aspect, in some possible implementations, the bit overhead of the indication field is equal to that for R₀The reported number of frequency domain vectors preconfigured per space domain vector on each transport layer in a transport layer is related, R₀For a predefined maximum number of transmission layers, R₀Is a positive integer.

Optionally, the overhead of the index value is

A bit; wherein Q is^i,sIs shown for R₀The number of selectable values of the number of the frequency domain vectors reported by each space domain vector on the ith transmission layer in the transmission layers is more than or equal to 1 and less than or equal to r₀，1≤r₀≤R₀And i, r₀Is an integer, Q^i,sIs a positive integer.

By designing a field capable of determining bit overhead in advance for the first part, the network device can decode the first part according to the bit overhead determined in advance, so as to obtain information therein to determine the bit overhead of the second part, and thus the second part can be correctly decoded. Through the design, the network equipment can correctly decode the first part and the second part of the CSI report, and further obtain the CSI fed back by the terminal equipment.

In addition, by a predefined value Q^i,sThe number of possible values of the frequency domain vector quantity reported by the terminal device can be smaller than or equal to the preconfigured frequency domain vector reporting quantity. I.e. for the r-th ₀A plurality of transmission layers, each of which is a transmission layer,

thereby the bit overhead of the fields can be further reduced.

Alternatively to the r-th₀A plurality of transmission layers, each of which is a transmission layer,

has a value of

is a positive integer. That is, the index value has an overhead of

A bit.

With reference to the fifth aspect or the sixth aspect, in some possible implementations, the number of the plurality of parameter sets is less than or equal to

Wherein R is₀For a predefined maximum number of transmission layers,

is shown for R₀Reporting quantity of frequency domain vectors pre-configured by space domain vectors on the ith transmission layer in the transmission layers; reporting quantity of frequency domain vectors preconfigured aiming at any two space domain vectors on the same transmission layer is the same; i is more than or equal to 1 and less than or equal to r₀，1≤r₀≤R₀And i, r₀And R₀Are integers.

For example, the number of the plurality of parameter groups is

For the r-th₀A plurality of transmission layers, each of which is a transmission layer,

since the correspondence relationship of the index value and the parameter group may be defined in advance, it may be saved in advance in the network device and the terminal device. Reducing the number of parameter sets can save storage space.

In a seventh aspect, a method of indicating 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, wherein the CSI report at least comprises a first part, and the first part at least comprises an indication field, and the indication field indicates the total number of frequency domain vectors reported for R transmission layers; the frequency domain vector reported by the R transmission layer in the R transmission layers is used for determining the precoding vector of each frequency domain unit on the R transmission layer; r is more than or equal to 1, R is more than or equal to 1 and less than or equal to R, and R and R are integers; and sending the CSI report.

In an eighth aspect, a method of indicating 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, wherein the CSI report at least comprises a first part and the first part at least comprises an indication field, and the indication field indicates the total number of frequency domain vectors reported for R transmission layers; the frequency domain vector reported by the R transmission layer in the R transmission layers is used for determining the precoding vector of each frequency domain unit on the R transmission layer; r is more than or equal to 1, R is more than or equal to 1 and less than or equal to R, and R and R are integers; determining a total number of frequency domain vectors reported for the R transport layers from the first portion of the CSI report.

Therefore, based on the above technical solution, the terminal device may indicate the total number of frequency domain vectors reported for the R transmission layers through the first part of the CSI report. The network device may determine the total number of frequency domain vectors reported for the R transmission layers according to the first part, decode the frequency domain vectors corresponding to each transmission layer in the second part, and construct precoding vectors corresponding to each frequency domain unit on each transmission layer based on each frequency domain vector and other information reported by the terminal device, such as space domain vectors and space-frequency combining coefficients. Therefore, the CSI report designed as above can be adapted to the codebook feedback mode of the two-domain compression. Because the CSI fed back by the terminal equipment is determined based on the downlink channel measurement, the CSI can be well adapted to the downlink channel, and therefore the network equipment is facilitated to determine the precoding matrix for data transmission adapted to the downlink channel. Thereby achieving the effect of improving the data transmission performance.

With reference to the seventh aspect or the eighth aspect, in some possible implementations, the overhead of the indication field is

The number of bits is one,

is shown for R₀R in transport layer₀The number of selectable values of the number of the frequency domain vectors reported by each space domain vector on each transmission layer is r which is more than or equal to 1 ₀≤R₀And r is₀Is an integer which is the number of the whole,

is a positive integer; in said R₀In each transmission layer, the pre-configured frequency domain vectors aiming at any two space domain vectors on the same transmission layer are the same, and the number of the space domain vectors corresponding to any two transmission layers is the same; the space vector corresponding to the R-th transmission layer of the R transmission layers and the frequency domain vector reported for each space vector on the R-th transmission layer are used for constructing the precoding vector of each frequency domain unit on the R-th transmission layer.

By predefined values

Thereby the bit overhead of the fields can be further reduced.

Alternatively,

has a value of

is a positive integer. I.e. the opening of the indication fieldThe pin is

The number of bits is one,

is shown for R₀R in transport layer₀Reporting quantity of frequency domain vectors pre-configured for each space domain vector on each transmission layer,

are integers.

With reference to the seventh aspect or the eighth aspect, in some possible implementations, the CSI report further includes a second part, and the second part of the CSI report includes indication information of the number of frequency domain vectors reported for each space domain vector on each of the R transport layers.

The terminal device may further indicate, in the second part, a number of frequency domain vectors reported for each spatial vector on each transport layer, so that the network device determines a frequency domain vector corresponding to each transport layer.

With reference to the seventh aspect or the eighth aspect, in some possible implementations, for an R-th transmission layer of the R transmission layers, the indication information specifically indicates a number M of frequency domain vectors reported for each space domain vector on the R-th transmission layer^rAnd

difference of (D), M^rIs a positive integer.

The number of frequency domain vectors reported for each transport layer is indicated in a differential manner, so that the bit overhead of the second part can be reduced.

In a ninth aspect, a method of indicating 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 comprising at least a first portion comprising at least R₀Individual field, R₀A predefined maximum number of transmission layers; the R is₀The field is used for indicating the number of the space-frequency merging coefficients reported aiming at each transmission layer in the R transmission layers; the space-frequency combining coefficients reported by the R transmission layer of the R transmission layers correspond to the space-frequency vector pairs reported by the R transmission layer one by one, so as to construct precoding vectors of each frequency domain unit on the R transmission layer; r ₀R is more than or equal to 1, R is more than or equal to 1 and less than or equal to R, and R₀R and R are integers; and sending the CSI report.

In a tenth aspect, a method of indicating 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 comprising at least R₀Individual field, R₀A predefined maximum number of transmission layers; the R is₀The field is used for indicating the number of the space-frequency merging coefficients reported aiming at each transmission layer in the R transmission layers; the space-frequency combining coefficients reported by the R transmission layer of the R transmission layers correspond to the space-frequency vector pairs reported by the R transmission layer one by one, so as to construct precoding vectors of each frequency domain unit on the R transmission layer; r₀R is more than or equal to 1, R is more than or equal to 1 and less than or equal to R, and R₀R and R are integers; and determining the number of transmission layers R and the number of space-frequency combining coefficients reported for each of the R transmission layers according to the first part of the CSI report.

Therefore, based on the above technical solution, the terminal device may determine, through the first part of the CSI report, the number of space-frequency combining coefficients that the terminal device reports for each transmission layer. The network device may decode the space-frequency combining coefficients corresponding to each transmission layer in the second portion according to the number of space-frequency combining coefficients reported by the first portion for each transmission layer, and construct precoding vectors corresponding to each frequency domain unit on each transmission layer based on each space-frequency combining coefficient and other information reported by the terminal device, such as space-domain vectors and frequency-domain vectors. Therefore, the CSI report designed as above can be adapted to the codebook feedback mode of the two-domain compression. Because the CSI fed back by the terminal equipment is determined based on the downlink channel measurement, the CSI can be well adapted to the downlink channel, and therefore the network equipment is facilitated to determine the precoding matrix for data transmission adapted to the downlink channel. Thereby achieving the effect of improving the data transmission performance.

With reference to the ninth aspect or the tenth aspect, in some possible implementations, the R₀Each field and R₀The transmission layers correspond to each other; the R is₀Each field of R fields in the fields is used for indicating the number of frequency domain vectors reported aiming at one transmission layer; the R is₀Remaining R in the individual field₀-R fields are predefined values representing that no frequency domain vector is reported for the corresponding transport layer; the R is₀The number field is used for implicitly indicating the number of transmission layers R.

With reference to the ninth aspect or the tenth aspect, in some possible implementations, the R₀R in the individual field₀Overhead of a field is

The number of bits is one,

is shown for R₀R in transport layer₀The number of selectable values of the number of space-frequency merging coefficients reported by each transmission layer is more than or equal to 1 and less than or equal to r₀≤R₀And r is₀Is an integer which is the number of the whole,

is a positive integer.

It can be seen that R is₀The bit overhead of a field is independent of the number of transport layers. One or more of the bit overheads can be predetermined by designing the first partThe plurality of fields enable the network device to decode the first portion according to a predetermined bit overhead to obtain information therein to determine the bit overhead of the second portion, thereby enabling correct decoding of the second portion. Through the design, the network equipment can correctly decode the first part and the second part of the CSI report, and further obtain the CSI fed back by the terminal equipment.

In addition, by predefined values

The number of possible values of the number of the space-frequency merging coefficients reported by the terminal equipment can be smaller than or equal to the number of the pre-configured space-frequency merging coefficients reported, that is to say, the number of the possible values of the number of the space-frequency merging coefficients reported by the terminal equipment can be smaller than or equal to the number of the pre-configured

Thereby the bit overhead of the fields can be further reduced.

With reference to the ninth aspect or the tenth aspect, in some possible implementations, the R₀R in the individual field₀Each field has

A selectable value, said

Alternative values include for the r < th > value₀Number of space-frequency combining coefficients reported by each transport layer

Seed value and for indicating the value of r₀The 1 value of the space-frequency merging coefficient is not reported by each transmission layer.

Based on each value, the network device may determine whether the terminal device reports the space-frequency combining coefficient and the number of the reported space-frequency combining coefficients for each transport layer.

With reference to the ninth aspect or the tenth aspect, in some possible implementations,

has a value of

Is shown for R₀R in transport layer₀The reporting quantity of the space-frequency merging coefficients pre-configured by each transmission layer,

is a positive integer.

In an eleventh aspect, a method of indicating 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 comprising at least a first portion comprising at least T₀+1 fields, T₀Is a predefined maximum number of transport layer groups; the T is₀The +1 field is used for indicating the number of space-frequency merging coefficients reported aiming at each transmission layer in the R transmission layers; the R transport layers belong to T transport layer groups, each transport layer group comprising one or more of the R transport layers; the T transmission layer groups comprise R transmission layers, and space-frequency merging coefficients reported by an R-th transmission layer in the R transmission layers correspond to space-frequency vector pairs reported by the R-th transmission layer one by one so as to construct precoding vectors of each frequency domain unit on the R-th transmission layer; t is₀More than or equal to T, R is more than or equal to T, R is more than or equal to 1 and less than or equal to R, and T₀T, R and r are all positive integers; and sending the CSI report.

In a twelfth aspect, a method of indicating 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 at least T ₀+1 fields, T₀For predefined maximum transmission layer groupsCounting; the T is₀The +1 field is used for indicating the number of space-frequency merging coefficients reported aiming at each transmission layer in the R transmission layers; the R transport layers belong to T transport layer groups, each transport layer group comprising one or more of the R transport layers; the T transmission layer groups comprise R transmission layers, and space-frequency merging coefficients reported by an R-th transmission layer in the R transmission layers correspond to space-frequency vector pairs reported by the R-th transmission layer one by one so as to construct precoding vectors of each frequency domain unit on the R-th transmission layer; t is₀More than or equal to T, R is more than or equal to T, R is more than or equal to 1 and less than or equal to R, and T₀T, R and r are all positive integers; and determining the number of transmission layers R and the number of space-frequency combining coefficients reported for each of the R transmission layers according to the first part of the CSI report.

Therefore, based on the above technical solution, the terminal device may determine, through the first part of the CSI report, the number of space-frequency combining coefficients that the terminal device reports for each transmission layer in each transmission layer group. The network device may decode the space-frequency combining coefficients corresponding to each transmission layer in the second portion according to the number of the space-frequency combining coefficients reported by each transmission layer in each transmission layer group indicated by the first portion, and construct precoding vectors corresponding to each frequency domain unit on each transmission layer based on the space-frequency combining coefficients and other information reported by the terminal device, such as space domain vectors and frequency domain vectors. Therefore, the CSI report designed as above can be adapted to the codebook feedback mode of the two-domain compression. Because the CSI fed back by the terminal equipment is determined based on the downlink channel measurement, the CSI can be well adapted to the downlink channel, and therefore the network equipment is facilitated to determine the precoding matrix for data transmission adapted to the downlink channel. Thereby achieving the effect of improving the data transmission performance.

With reference to the eleventh aspect or the twelfth aspect, in some possible implementations, the T₀+1 field comprising and T₀T corresponding to transmission layer group₀A field and an indication field; the T is₀T fields of the fields are used for indicating reporting of the information aiming at each transmission layer in each transmission layer group of the T transmission layer groupsThe number of space-frequency combining coefficients; the T is₀The rest of T in each field₀-T fields are predefined values indicating that no space-frequency combining coefficients are reported for the corresponding group of transmission layers; the indication field is used for indicating the number of transmission layers of which the space-frequency merging coefficients are reported aiming at the T transmission layer group in the T transmission layer groups; the T is₀The +1 field is used to implicitly indicate the number of transmission layers R.

Through the above-mentioned T₀The +1 fields jointly indicate the number of transmission layers, and the RI field in the existing CSI report can be eliminated, thereby facilitating reduction of bit overhead of the first part of the CSI report.

With reference to the eleventh aspect or the twelfth aspect, in some possible implementations, the T₀T-th in the individual field₀Overhead of a field is

The number of bits is one,

representation for T₀T in a group of transmission layers₀The number of the selectable values of the sum of the number of the space-frequency merging coefficients reported by one or more transmission layers in the transmission layer group,

Is a positive integer.

In addition, by predefined values

Thereby the bit overhead of the fields can be further reduced.

With reference to the eleventh aspect or the twelfth aspect, in some possible implementations, the T₀T-th in the individual field₀Each field has

A selectable value, said

Alternative values include for the t₀Number of space-frequency merging coefficients reported by each transmission layer group in transmission layer groups

Seed value and for indicating the value for the t ₀The transmission layer group does not report 1 value of the space-frequency merging coefficient.

Based on each value, the network device may determine whether the terminal device reports the frequency domain vector and the number of reported space-frequency combining coefficients for each transmission layer group.

With reference to the eleventh or twelfth aspect, in some possible implementations,

has a value of

Represents for said T₀T of a group of transmission layers₀One or more transport layer pre-allocation in a group of transport layersThe sum of the reported numbers of the spatial frequency merging coefficients,

is a positive integer.

With reference to the eleventh aspect or the twelfth aspect, in some possible implementations, the overhead of the indication field is

A bit; s is for T₀A maximum number of transmission layers preconfigured in a group of transmission layers, the maximum number of transmission layers representing a number of transmission channels for the T₀And the maximum value of the transmission layer numbers pre-configured by each transmission layer group in the transmission layer groups, wherein S is a positive integer.

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

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 the instructions in the memory to implement the method of the first aspect, the third aspect, the fifth aspect, the seventh aspect, the ninth aspect, the eleventh aspect, and any possible implementation of the above 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 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, there is provided a communications apparatus comprising means for performing the methods of the second, fourth, sixth, eighth, tenth, twelfth and any of the above possible implementations.

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 the second, fourth, sixth, eighth, tenth, twelfth aspect described above and any possible implementation of the above 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 device 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 an input signal through the input circuit and output 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 one or more chips, 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 to twelfth aspects and the first to twelfth aspects.

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 provided separately 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.

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, the data output by the processor may be output to a transmitter and the input data received by the processor may be from a receiver. The transmitter and receiver may be collectively referred to as a transceiver, among others.

The processing means in the eighteenth aspect may be one or more chips, the processor may be implemented by hardware or may be implemented by 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 twelfth aspects and 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 for indicating CSI provided by an embodiment of the present application;

fig. 2 to 4 are schematic flowcharts of methods for indicating CSI provided by embodiments of the present application;

fig. 5 is a schematic block diagram of a communication device provided by an embodiment of the present application;

fig. 6 is a schematic structural diagram of a terminal device provided in an embodiment of the present application;

fig. 7 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) system, a future fifth generation (5G) system or a new radio access (UMTS) system (3632), wherein the GSM system, the CDMA system, the WCDMA system, the GPRS system, the LTE system, the UMTS system, the WiMAX system, the UMTS Vehicle, the Vehicle 3632, V2I), Vehicle-to-pedestrian (V2P), inter-Vehicle communication Long Term Evolution (Long Term Evolution-Vehicle, LTE-V), Internet of vehicles (Internet of Things, IoT), Long Term Evolution-Machine (LTE-M), Machine-to-Machine (M2M), and so on.

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 a precoding vector according to 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), wireless relay Node, wireless backhaul Node, Transmission Point (TP), or Transmission and Reception Point (TRP) in a wireless fidelity (WiFi) system, and the like, and may also be 5G, e.g., NR, a gbb in a system, or a transmission point (TRP or TP), one or a group of base stations in a 5G system may include multiple antennas, or may also constitute a panel of a network, e.g., a panel of a network, or a 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 Radio Resource Control (RRC) and Packet Data Convergence Protocol (PDCP) functions, and a DU implements Radio Link Control (RLC), Medium Access Control (MAC) and Physical (PHY) functions. 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 the RRC layer signaling, may also be considered to be transmitted by the DU or the 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 computer (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 telemedicine (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 transport layers, through layer mapping (layermapping). 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 precoded signal to the REs. These REs are then modulated by Orthogonal Frequency Division 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 Channel Quality Indicator (CQI) sub-band, or f times of the CQI sub-band, where f is less than or equal to 1, and a value of f may be, for example, 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 space-frequency combination coefficient of a space-frequency vector pair, a frequency-domain vector, and a space-frequency vector 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-and-noise (SLNR), and so on. 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 transmission 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 transmission 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 transmission layer. When the number of transmission layers is 1 and the number of polarization directions of the transmit antennas is multiple, the precoding vector may refer to a component of the precoding matrix in one polarization direction. When the number of transmission 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 transmission 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 therefore, 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, an antenna port may refer to a transceiver unit (TxRU).

5. Spatial domain vector (spatial domain vector): or beam (beam) vectors. 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 space.

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 (type ii) codebook of the NR protocol TS 38.214 version 15(release 15, R15).

In the embodiment of the present application, the spatial vector is one of vectors used to construct the precoding vector.

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 spatial vector used for constructing the precoding vector may be determined from a set of spatial vectors. Alternatively, the set of spatial vectors includes a plurality of candidate spatial vectors that can be used to construct the precoding vector.

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 may be taken from a two-dimensional (2-dimensional, 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 may beTo be recorded as

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 spatial 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.

O < th > in the set of spatial vectors_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_sA space vector canConstruction 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 a frequency domain unit may also be f times of a subband, where f is less than or equal to 1, and f may take a value of, for example, 1 or 1/2, or the frequency domain length of a 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.

In this embodiment of the present application, the frequency domain vector may be used to construct a combination of multiple spatial vectors and frequency domain vectors with the spatial vector, or a space-frequency vector pair for short, so as to construct a precoding vector.

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 frequency domain vector used for constructing the precoding vector may be determined from a set of frequency domain vectors. Alternatively, the set of frequency domain vectors includes a plurality of candidate frequency domain vectors that can be used to construct the precoding vector.

In one possible design, if the number of frequency domain elements or the length of the frequency domain vector is N_fThe 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. Each frequency domain vector in the set of frequency domain vectors may be taken from an oversampled DFT matrix or a conjugate transpose of an 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 matrices 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 space-frequency component matrices may be used to construct a space-frequency precoding matrix corresponding to one transmission layer. In other words, the space-frequency precoding 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 transmission layer, a precoding vector corresponding to each frequency domain unit on the transmission 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

Wherein, W₃ ^HRepresents W₃The conjugate transpose of (c).

If dual polarization directions are adopted, 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 W₃ ^HDimension 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 moment ₃M 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 in (b), the space-frequency merging coefficient corresponding to the ith space-domain vector is a space-frequency merging 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 precoding matrix H 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 space-frequency combining coefficients (e.g., including amplitude and phase) of the sub-bands separately on a per frequency-domain basis (e.g., sub-bands). 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.

11. 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 corresponding to 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 coefficient is associated with a space-domain vector and a frequency-domain vectorThe quantity pairs have a one-to-one correspondence, or each space-frequency combining coefficient corresponds to one space-frequency vector and one frequency-domain vector, or each space-frequency combining coefficient corresponds to one space-frequency vector pair. 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

The network device may configure the maximum number K of space-frequency combining coefficients that may be reported by the terminal device corresponding to each spatial layer₀In which K is₀≤2L×M。K₀And

the total number of merging coefficients 2LM contained in the system can be in a proportional relationship, for example K ₀The value of β "&gttttβ &ttt/t &gtt = β · 2LM, &lttttransition = may be {3/4,1/2,1/4}₁A space-frequency combining coefficient of non-zero amplitude, and K₁≤K₀。

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

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 coefficients whose amplitudes are quantized by non-zero quantization values may be referred to as space-frequency combining coefficients whose amplitudes are non-zero. In other words, the plurality of space-frequency combining coefficients consists of one or more space-frequency combining coefficients with non-zero amplitude and one or more space-frequency combining coefficients with zero amplitude.

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. Transport layer (layer): in MIMO, one transmission layer can be viewed 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 transmission layers.

The number of transmission layers is the rank of the channel matrix. The terminal device may determine the number of transmission 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 transport layers may be distinguished according to the size of the eigenvalues. For example, the precoding vector determined by the eigenvector corresponding to the largest eigenvalue may be associated with the 1 st transmission layer, and the precoding vector determined by the eigenvector corresponding to the smallest eigenvalue may be associated with the R-th transmission layer. That is, the eigenvalues corresponding to the 1 st to R-th transport layers decrease in sequence. In brief, the intensity of the 1 st transmission layer to the R th transmission layer in the R transmission layers decreases gradually.

It should be understood that distinguishing between different transport layers based on characteristic 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 the transport 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).

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 a CSI report based on a 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 the terminal device generates the CSI report, the content in the CSI report may be divided 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 from 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 PMIs and reporting of RIs, the following embodiments only refer to the relevant information of PMIs and RIs, and do not refer to others, for the enumeration of the contents in the first and second parts of CSI reporting. 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, and the second portion of the CSI report may also include other information. This is not a limitation of the present application.

Since the information about PMI in part 1 in the current CSI report mainly relates to space-vector and space-frequency combining coefficients, this design is not suitable for the feedback mode of dual-domain compression. In the feedback mode of dual-domain compression, the terminal device needs to indicate the selected frequency domain vector and the space-frequency combining coefficient corresponding to the space-frequency component matrix through the PMI, but since the network device cannot predict how many frequency domain vectors the terminal device will report in advance, the payload size of part 2 cannot be estimated, and then the information in part 2 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:

R₀: a predefined maximum number of transmission layers. R₀Is a positive integer. Alternatively, R ₀Is 4.

r₀: and R₀Correspond to 1 to R₀Value within the range r₀Is a positive integer.

R: the actual number of transmission layers. R is less than or equal to R₀And R is a positive integer. R is the rank value corresponding to the precoding matrix.

r: corresponding to R, values can be taken from 1 to R, and R is a positive integer.

T₀: a predefined maximum number of transport layer groups. T is₀Is a positive integer.

t₀: and T₀Correspond to, can be in the range of 1 to T₀Value within the range t₀Is a positive integer.

T: the actual number of transmission layers. T is less than or equal to T₀And T is a positive integer.

t: corresponding to T, values can be taken from 1 to T, T being a positive integer.

L: the number of the space domain vectors reported by the terminal device for each transmission layer, or the number of the space domain vectors preconfigured by the network device for each transmission layer. L is a positive integer.

For the r th₀Reporting quantity of frequency domain vectors preconfigured by each transmission layer;

is a positive integer.

M^r: for the number of frequency domain vectors reported by the r-th transport layer,

M^ris a positive integer.

For the r th₀Reporting quantity of frequency domain vectors preconfigured by each space domain vector on each transmission layer;

is a positive integer.

M^r,s: the number of frequency domain vectors reported for each space domain vector on the r-th transport layer,

M^r ^,sis a positive integer.

For the t-th₀Reporting quantity of frequency domain vectors preconfigured by each transmission layer in the transmission layer groups;

Is a positive integer.

M^t: for the number of frequency domain vectors reported by each transport layer in the t-th transport layer group,

M^tis a positive integer.

For the t-th₀Reporting quantity of frequency domain vectors preconfigured by each space domain vector on each transmission layer in each transmission layer group;

is a positive integer.

M^t,s: the number of frequency domain vectors reported for each space domain vector on each transport layer in the t-th transport layer group,

M^t,sis a positive integer.

For the r th₀Reporting number of space-frequency merging coefficients preconfigured by each transmission layer;

is a positive integer.

K^r: aiming at the number of the space-frequency merging coefficients reported by the r transport layer,

M^ris a positive integer.

is a positive integer.

K^t: for the number of frequency domain vectors reported by each transport layer in the t-th transport layer group,

K^tis a positive integer.

For the r th₀The possible values of the frequency domain vector quantity reported by each transmission layer,

is a positive integer.

For the r th₀The possible values of the number of the frequency domain vectors reported by each space domain vector on each transmission layer,

is a positive integer.

For the t-th₀The possible number of values of the frequency domain vector quantity reported by each transmission layer in the transmission layer group,

Is a positive integer.

For the t-th₀The possible values of the number of the frequency domain vectors reported by each space domain vector on each transmission layer in each transmission layer group,

is a positive integer.

For the r th₀The possible values of the number of the space-frequency merging coefficients reported by each transmission layer,

is a positive integer.

For the t-th₀The possible value number of the sum of the number of the space-frequency merging coefficients reported by one or more transmission layers in the transmission layer group,

is a positive integer.

S: when t is₀In the range of 1 to T₀Determined during traversal of middle and T₀T corresponding to transmission layer group₀The transmission layer number having the largest value among the transmission layer numbers. The number of transmission layers corresponding to a transmission layer group is specifically the number of transmission layers included in the transmission layer group. Briefly, S may represent for T₀The transmission layer number with the largest value is selected from the transmission layer numbers configured by each transmission layer group in the transmission layer groups. R is less than or equal to S, and S is a positive integer.

Second, in the present embodiment, for convenience of description, when referring to numbering, numbering may be continued from 1. For example, the R transmission layers may include a 1 st transmission layer to an R th transmission layer, the L beam vectors may include a 1 st beam vector to an 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 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 parameters are provided with upper and lower corner marks, and in the following embodiments, in the case where no particular description is made, the corner mark located at the upper right corner of the parameter is the upper corner mark and should not be construed as square, cubic, r-th power, or the like.

Fourth, in the embodiments of the present application, the embodiments provided in the present application are described by taking the beam vector and the frequency domain vector as 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 indicating 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 existing indication methods, such as, 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 description, 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 report, RI, PMI, frequency domain unit, spatial domain vector, frequency domain vector, and space-frequency combining coefficient of space-frequency component matrix, 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, different fields, different indication information, etc. are distinguished.

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 transmission layer may refer to the number of the frequency domain vectors that need to be reported for the transmission layer, and therefore, the reporting number of the frequency domain vectors configured for a certain transmission 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 reported space-frequency combining coefficients preconfigured for a certain transmission layer may refer to the number of space-frequency vector pairs that need to be reported for the transmission layer, and therefore, the number of reported space-frequency vector pairs configured for a certain transmission layer may be greater than or equal to the number of space-frequency combining coefficients actually reported, 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 as a portion of a stand-alone device, a portion of which is integrated into a decoder, a processor, or a 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 exists alone, A and B exist simultaneously, and B exists alone, wherein A and B can 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 unit in the terminal device or the network device that can call the program and execute the program.

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

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 through 230. The steps in method 200 are described in detail below.

In step 210, the terminal device generates a CSI report.

As described above, in the feedback method of dual-domain compression, the terminal device needs to report the selected space domain vector, and also needs to report the selected frequency domain vector and the space-frequency combination coefficients corresponding to the space domain vector and the frequency domain vector (or the space-frequency component matrix, the space-frequency vector, etc.). The spatial vector, the frequency domain vector, and the related content of the space-frequency combining coefficient corresponding to the spatial vector and the frequency domain vector have been described in detail above, and for brevity, the details are not repeated herein

In an embodiment of the present application, the CSI report includes a first part and a second part. For reporting the frequency domain vectors, the first part may include at least a plurality of fields with a bit overhead that can be predetermined, so as to indicate the number of frequency domain vectors reported by the terminal device for each of the R transport layers; in addition, the multiple fields in which the bit overhead can be predetermined can also be used to implicitly indicate the number of transmission layers R. The second part may include indication information of the frequency domain vectors reported by the terminal device for each transport layer.

It should be understood that the information contained in the first and second portions referred to above is only information related to the reporting of the frequency domain vector and does not represent the entire information contained in the first and second portions. For example, the first portion may also include CQI. For another example, the second part may further include information indicating a space vector, quantization information of space-frequency combining coefficients, and the like. This is not a limitation of the present application. It should be noted that, in the present embodiment, the number of transmission layers R may be implicitly indicated by the above-mentioned fields, and need not be indicated by an additional field (e.g., RI).

A specific method for indicating the number of frequency domain vectors reported for each transmission layer and the number of transmission layers through a plurality of fields that can be predetermined by bit overhead in the first section is described in detail below. In one possible implementation, the first portion may include a fixed bit overhead R₀A field. R₀Indicating a reservationMaximum number of transport layers, R₀Is a positive integer.

Specifically, the R₀Each field and R₀The transport layers correspond. The R is₀R fields of the fields correspond to the actual number R of transmission layers. The actual number of transmission layers is the rank value corresponding to the precoding matrix. Each of the R fields may be used to indicate the number of frequency domain vectors reported by the terminal device for one of the R transport layers. Taking the R-th field of the R fields as an example, R is more than or equal to 1 and less than or equal to R, and R is an integer. Then the R field of the R fields can be used to indicate the number M of frequency domain vectors reported by the terminal device for the R transport layer^r，M^rIs a positive integer.

In addition, R is₀The maximum transmission layer number is not determined to be R, which does not represent the actual transmission layer number₀. The actual number of transmission layers can be determined by the terminal equipment by channel measurements, for example denoted R, R ≦ R₀. When R < R ₀When, it can be considered that the number of transmission layers that can be used is R, and R is another₀-R transport layers are not available or unused, or the reported precoding matrix corresponds to R transport layers.

In the examples below, R is introduced₀Corresponding r₀And R corresponding to R. Wherein r is more than or equal to 1₀≤R₀R is more than or equal to 1 and less than or equal to R. In the following description where R is referred to₀R in transport layer₀When there is a transmission layer, it may specifically mean that the network device assumes that the actual number of transmission layers is R₀When is at r₀One transport layer refers to the hypothetical R₀R in transport layer₀And a transport layer. In fact, the R-th transport layer of the R transport layers is associated with R₀R in transport layer₀The transport layers indicated by the transport layers are the same transport layer. Only the R-th transport layer of the R transport layers is the actually used transport layer, R₀R in transport layer₀The transport layers are hypothetical transport layers. If the number of transmission layers is R, when R₀When taking values from 1 to R, the R₀The transport layers may be replaced with the r-th transport layer. So that the arrangement R is designed in the first part₀The number field indicates the number of frequency domain vectors reported by the terminal device for each transport layer, because the network device does not know the actual number of transport layers determined by the channel measurement. In order to ensure that the bit overhead of the first part is a fixed value, it is necessary to reserve a field for each transmission layer so that the terminal device indicates the number of frequency domain vectors reported for each transmission layer, assuming that the number of transmission layers is a preconfigured maximum number of transmission layers. As previously described, the plurality of transport layers may be defined in an order of decreasing intensity. When the actual number of transmission layers is R ₀When R is₀The transmission layers may sequentially include a 1 st transmission layer, a 2 nd transmission layer, a 3 rd transmission layer up to the R < th > transmission layer in the order of decreasing intensity₀And a transport layer. When the actual number of transmission layers R is less than R₀In the meantime, the R transport layers may sequentially include a 1 st transport layer, a 2 nd transport layer, a 3 rd transport layer, up to the R th transport layer in order of decreasing intensity. Thus, the R transport layers may be R as described above₀R transmission layers with the intensity decreasing from strong to weak in sequence, namely R₀1 st to R-th transport layers among the transport layers.

When the actual number of transmission layers R is equal to R₀When R is₀Each of the fields corresponds to a transport layer for indicating a number of frequency domain vectors reported for the corresponding transport layer. For example, the R field of the R fields may be used to indicate the number of frequency domain vectors reported for the R transport layer.

When the actual number of transmission layers R is less than R₀When R is₀R of the fields may correspond to R transport layers, and each of the R fields may be used to indicate the number of frequency domain vectors respectively reported for the corresponding transport layer. For example, the R field of the R fields may be used to indicate the number of frequency domain vectors reported for the R transport layer. The rest of R ₀the-R field may be a predefined value for indicating that no frequency domain vectors are reported for the corresponding transport layer, or that the number of frequency domain vectors reported for the corresponding transport layer is 0. The predefined value may be 0.

Due to the R₀R in individual field for unreported frequency domain unit₀-R fields are filled with predefined values to implicitly indicate that the corresponding transport layer is not used. The actual number of transmission layers R can thus be determined in combination with the first R fields. In other words, the R₀The field can be used to implicitly indicate the number of transmission layers R, or R₀The fields may be used to jointly indicate the number of transmission layers R.

In addition, R is₀The positions of the R fields corresponding to the R transport layers in each field may be predefined, such as protocol definition, or may be determined by pre-negotiation between the network device and the terminal device. For example, R may be predefined₀The first R fields of a field correspond to R transport layers, or the R₀The last R fields of a field correspond to R transport layers.

As an embodiment, the number of frequency domain vectors reported for each transport layer may be preconfigured. For example, the network device is pre-configured through signaling, or the protocol is predefined, and the terminal device is pre-configured before factory shipment. This is not a limitation of the present application.

Optionally, the method further comprises: the terminal equipment receives first indication information, wherein the first indication information is used for indicating R₀Reporting quantity of frequency domain vectors preconfigured by each transmission layer in the transmission layers. Accordingly, the network device transmits the first indication information. That is, the reporting number of frequency domain vectors preconfigured for each transport layer is configured by the network device.

For the r th₀The reported number of frequency domain vectors preconfigured for each transport layer may be written, for example

Is a positive integer. It is to be understood that the preconfigured number of frequency domain vectors reported for each transport layer may be understood as the maximum number. For example, for the r-th₀Reporting quantity of frequency domain vectors preconfigured by each transmission layer

Can be understood as being directed to the r₀The maximum number of frequency domain vectors reported by each transport layer. That is, the terminal device is directed to the r-th₀The number of frequency domain vectors actually reported by each transport layer may be less than or equal to the maximum number.

It should be understood that if the terminal device is directed to the r-th₀Reporting the frequency domain vector by a transmission layer, which indicates that the transmission layer exists, or is used or can be used, wherein the r < th > is₀The transport layers may be replaced with the r-th transport layer.

For R₀R in the individual field₀A field, can define

And optional values are selected. Wherein the content of the first and second substances,

is shown for R₀R in transport layer₀And the number of selectable values of the number of the frequency domain vectors reported by each transmission layer. The

The optional value may specifically include for the r-th value₀Corresponding to the number of frequency domain vectors reported in each transport layer

Species value and r₀The individual transport layers do not report 1 value of the frequency domain vector.

In a possible implementation, the protocol may predefine the number of selectable values of the number of frequency domain vectors reported by each transport layer. The number of the selectable values can be less than

For example, for the r-th₀The reporting quantity of frequency domain vectors preconfigured by each transmission layer is 8, and the protocol can be presetIs defined for the r₀A plurality of selectable values of the number of frequency domain vectors reported by the transmission layers, for example, the plurality of selectable values include 2, 4, 6, and 8, then

Is 4.

Each value of (a) may correspond to the r-th value₀One value of the number of frequency domain vectors reported by each transport layer, for example, "00" corresponds to 2, "01" corresponds to 4, "10" corresponds to 6, "11" corresponds to 8. As another example, the plurality of selectable values may be 4 values, i.e., 5 to 8, then

Is 4.

Each value of (a) may correspond to the r-th value ₀One value of the number of frequency domain vectors reported by each transport layer, for example, "00" corresponds to 5, "01" corresponds to 6, "10" corresponds to 7, "11" corresponds to 8. It is to be understood that the above list

The corresponding relationship between the value and the reported frequency domain vector quantity is only an example, and should not constitute any limitation to the present application.

In another possible implementation, the protocol may predefine the maximum number of frequency domain vectors reported for each transport layer (i.e., the number of frequency domain vector reports preconfigured for each transport layer) and the number of selectable values of the number of frequency domain vectors reported for each transport layer. Wherein the maximum number of frequency domain vectors reported for the r-th transport layer may be set by a pre-configured value M_0,rOr a pre-configured coefficient p_0,rAnd (4) determining. For example, the network device may pre-configure a maximum number of frequency domain vectors reported for each transport layer to be M_0,r，

p_0,r、N_fAnd f may be a pre-configured value. In particular, p_0,rAre pre-configured coefficients. N is a radical of_fIs the length of the frequency domain vector, i.e. the number of elements the frequency domain vector contains. N is a radical of_fThe value of (1) can be the number of frequency domain units or a preset value. f is the ratio of the granularity of the CQI sub-band to the granularity of the PMI sub-band, and can be used for representing that one CQI frequency domain sub-band comprises f PMI sub-bands. The protocol may be predefined for this r ₀And a plurality of selectable values of the number of the frequency domain vectors reported by the transmission layers. The plurality of selectable values may correspond to a relative preconfigured value M_0,rOr a coefficient of configuration value p_0,rHas a preset proportional relation. For example, the plurality of selectable values may be M_0,r/2，M_0,rAnd/4, etc., or the plurality of selectable values can be represented by p_0,r/2，p_0,rAnd/4, etc. The preset proportional relations corresponding to the plurality of selectable values are respectively 1/2, 1/4 and the like. For the sake of brevity, no further illustration is provided here.

It should be understood that the plurality of selectable values described herein are relative to the preconfigured value M_0,rOr a coefficient of configuration value p_0,rThe specific values of the proportional relationship(s) are merely examples and should not be construed as limiting the application in any way.

In one implementation, M₀The reporting quantity of the frequency domain vectors which are pre-configured for the 1 st transmission layer can be determined according to the quantity M of the frequency domain vectors reported by other transmission layers_0,rCan be based on

The value of (2) is determined. p is a radical of_0,rSelectable coefficients configured for the r-th transport layer for the network device. For example, for the 1 st transport layer p_1,rIs p_0,rFor the 2 nd transport layer p_2,rIs p_0,r2 for the 3 rd and 4 th transport layers, p_3,rAnd p_4,rIs p_0,rAnd/4, etc. It should be understood that the number of the selectable coefficients configured by the network device for each transport layer is not limited to one, and the application does not limit this. For example, p _rThere may be a plurality of alternative values. Thus correspond toThe number of frequency domain vectors reported by the r-th transport layer may also be a plurality of selectable values. For the r transport layer, there may be

And (4) optional values.

It is to be understood that p is the different transport layers listed above_rThe values of (a) are merely examples and should not be construed as limiting the application in any way. It should also be understood that the specific manner of reporting the number of frequency domain vectors preconfigured for each transport layer listed herein is only one possible implementation manner, and should not limit the present application in any way.

Due to the fact that for the r₀In each transmission layer, the terminal device may or may not report the frequency domain vector. Under the condition that the frequency domain vectors are reported, the number of the frequency domain vectors actually reported by the terminal equipment

Therefore it has the advantages of

And possible values. The terminal device may be specifically at the r-th₀The field is filled with indication bits corresponding to the actual number. For example, at the r-th₀The number of actually reported frequency domain vectors, or the identifiers and indexes corresponding to the number of the frequency domain vectors, is filled in each field. In the case that no frequency domain vector is reported, the terminal device may report a predefined value to implicitly notify the network device that no frequency domain vector is reported to the transport layer. For example, the terminal device may be at the r-th position ₀Fields are filled with "0". Where "0" is an example of a predefined value.

Alternatively,

has a value of

That is, for the r-th₀Number of frequency domain vectors reported by each transport layerComprises from 1 to

This is achieved by

An optional integer value.

It should be understood that the terminal device may indicate different information through different indication bits. The above listed indication bits are only examples and should not be construed as limiting the present application in any way. As long as the terminal equipment and the network equipment have the same rule defined in advance, the terminal equipment can generate R according to the rule₀Each of the fields, the network device may also interpret the R according to the rule₀Each of the fields. The rules described herein may specifically refer to different meanings indicated by different values of the indicator bits in each field.

Since the terminal device is directed to the r₀The number of frequency domain vectors reported by a field can be preconfigured by the network equipment, and if the number of frequency domain vectors actually reported by the terminal equipment is less than or equal to the value preconfigured by the network equipment, the r-th value₀The overhead of each field should be greater than or equal to the overhead required when the actual reported number is a pre-configured value. Furthermore, when the terminal device is directed to the r-th ₀When no frequency domain vector is reported by each transport layer, the field needs to be filled with a predefined value. Thus, the r-th₀The overhead of a field may be

A bit. Therein

I.e. corresponding to that described above

And optional values are selected.

It can be seen that R is₀The bit overhead of each of the fields can be predetermined, then R is₀Total bit overhead of individual fieldsCan be fixed.

How the terminal device specifically passes through

A bit to indicate for the r₀The number of frequency domain vectors reported by each transport layer, and the number of the r-th channel₀The specific contents of whether the frequency domain vector is reported by each transport layer are described in detail above, and for brevity, are not described again here.

In summary, for the r-th₀A transport layer, which may be overhead

Field of bits to indicate for the r-th₀The number of frequency domain vectors reported by each transport layer, wherein,

and is a positive integer. In addition, for R₀The number of selectable values predefined by the protocol for the number of frequency domain vectors reported by each transport layer may be the same or different for each transport layer, which is not limited in the present application.

It can be understood that, when the reporting number of the frequency domain vectors preconfigured for each transport layer is the same, and the number of the selectable values of the number of the frequency domain vectors predefined by the protocol for each transport layer is the same, the length of the field configured for any two transport layers may be the same. That is, R is as defined above ₀The bit overhead of any two of the fields may be the same. Or, the R₀The individual fields are fields of the same length.

As previously mentioned, according to the above R₀The bit overhead of each of the fields may be used to determine R in the first portion₀Total bit overhead of individual fields. For example, the R₀The total overhead of the individual fields is:

a bit.

Due to the fact thatPer R₀The field indicates the number of transmission layers R, and the RI field originally designed in the CSI report part 1 can be eliminated, so that the bit overhead can be reduced. In other words, the first part of the CSI report does not include the RI field. Further, the other part except the first part in the CSI report does not include the RI field, so that the bit overhead can be reduced.

In addition, as described above, the first part of the CSI report may further include other fields, such as a CQI field in the CSI report part 1 that was originally designed. The bit overhead can also be predetermined since other fields can follow the design of CSI report part 1 in the prior art.

Thus, the total bit overhead of the first part of the CSI report may be predetermined.

It is to be understood that R in the first section is exemplified above ₀The bit overhead of each field is only an example, and should not be construed as limiting the application in any way. For example, the R₀Not every field of a field needs to indicate by a predefined value whether a frequency domain vector is reported for the corresponding transport layer. No matter what the number of actual transmission layers is, the 1 st transmission layer is always needed to be used, so the field corresponding to the 1 st transmission layer does not need to indicate whether the frequency domain vector is reported for the transmission layer through a predefined value. The overhead of the field corresponding to the 1 st transport layer may be

A bit. Q^r1Representing the number of possible values, Q, of the number of frequency domain vectors reported for the 1 st transport layer^r1Is a positive integer. R in the first field thus determined₀The total bit overhead of the individual fields may also be adjusted accordingly.

As can be seen from the above examples, R in the first part₀The total overhead bits of the individual fields are independent of the actual number of transport layers R. The R is₀The total bit overhead of a field may be determined by the maximum number of transport layers R₀And determining the reporting quantity of the frequency domain vectors preconfigured for each transmission layer.

As another example, the number of frequency domain vectors reported for each spatial domain vector on each transport layer may be preconfigured. For example, pre-configured by the network device through signaling, or predefined by the protocol. This is not a limitation of the present application.

It should be noted that the frequency domain vector reported by the terminal device for a certain space vector may be considered as a frequency domain vector corresponding to the space vector. That is, any one of the frequency domain vectors reported by the terminal device may be combined with the space domain vector to obtain a space-frequency component matrix. The related content of the space-frequency component matrix has been specifically described in the foregoing, and is not described herein again for brevity.

Optionally, the method further comprises: the terminal equipment receives first indication information, wherein the first indication information is used for indicating R₀And reporting quantity of the frequency domain vectors preconfigured by each space domain vector on each transmission layer in each transmission layer. Accordingly, the network device transmits the first indication information. That is, the reported number of frequency domain vectors preconfigured for each spatial domain vector on each transport layer is configured by the network device.

In addition, the number of the space vectors reported by the terminal device for each transport layer may also be configured in advance. For example, pre-configured by the network device through signaling, or predefined by the protocol. This is not a limitation of the present application.

The number of the airspace vectors reported by the terminal equipment aiming at each transmission layer can be less than or equal to the reporting number of the preconfigured airspace vectors. Taking the r-th transmission layer as an example, the number of the spatial vectors actually reported by the terminal device for the r-th transmission layer may be less than or equal to that for the r-th transmission layer ₀And reporting the spatial vector preset by each transmission layer.

In one possible design, the reporting number of frequency domain vectors preconfigured for any two space domain vectors on the same transmission layer is the same. In other words, for the same transport layer (e.g., the r-th transport layer)₀Number of reported frequency domain vectors per space domain vector configuration at transport layer) can be represented by the same parameter, e.g., denoted as

Is a positive integer. Wherein the superscript "s" denotes the airspace. That is, the

Corresponds to one transport layer, one spatial vector.

Correspondingly, the number of frequency domain vectors actually reported by the terminal device for any two space domain vectors in each transmission layer is also the same. In other words, the number of frequency domain vectors reported for each space domain vector on the same transport layer (e.g., the r-th transport layer) can be represented by the same parameter, for example, denoted as M^r,s，M^r,sIs a positive integer.

Even if the number of the frequency domain vectors corresponds to one transmission layer, one space domain vector, by the R₀The number of frequency domain vectors reported by the terminal device for each transport layer may still be indicated by the number field. For example, assume for the r-th₀The maximum number of the airspace vectors reported by each transmission layer is L, and the terminal equipment aims at the r < th > space vector ₀The total number of frequency domain vectors reported by each transmission layer can not exceed

And (4) respectively.

In another possible design, the same frequency domain vector is used for any two space domain vectors on the same transmission layer, in other words, for the same transmission layer (e.g., the r-th space domain vector)₀Transmission layers) of the space domain vectors can be reported according to the same parameters

And (4) showing. If the frequency domain vectors reported for any two transmission layers are the same. The terminal device is directed to the r₀The total number of frequency domain vectors reported by each transport layer may still be

And (4) respectively.

For the r-th₀A transport layer, which may be overhead

Field of bits to indicate for the r-th₀The number of frequency domain vectors reported by each space domain vector on each transport layer, wherein,

is shown for R₀R in transport layer₀And the number of the selectable values of the number of the frequency domain vectors reported by each space domain vector on each transmission layer.

And is a positive integer. For example, the protocol may predefine the number of selectable values for the number of frequency domain vectors reported for each transport layer. The number of the selectable values can be less than or equal to

As already described above

As a result of the detailed description, it is,

and

the two parameters defined for different granularities have the same function, and are not described in detail herein for brevity.

Alternatively,

in addition, the r-th₀The maximum number of space-domain vectors reported by each transport layer is L, namely for the r < th > layer₀The reporting quantity of the space domain vectors preconfigured by each transmission layer is L.

Optionally, the frequency domain vectors reported for any two space domain vectors on the same transmission layer are the same. That is, multiple spatial vectors on the same transmission layer may share the same frequency domain vector. For the r-th₀A transmission layer, wherein if the maximum value of the reported number of the space domain vectors is L, the terminal equipment aims at the r-th space domain vector₀The total number of the frequency domain vectors reported by each transmission layer cannot exceed the total number of the frequency domain vectors reported by each transmission layer

Thus, for the r-th₀A transport layer, which can still be made of overhead

Field of bits to indicate for the r-th₀And the quantity of the frequency domain vectors reported by each space domain vector on each transmission layer.

It is to be understood that, when the number of frequency domain vectors reporting preconfigured for each spatial vector on each transport layer is the same, and the number of frequency domain vectors that must be reported predefined by the protocol for each spatial vector on each transport layer is the same, the length of the field configured for any two transport layers may be the same. That is, R is as defined above₀The bit overhead of any two of the fields may be the same. Or, the R ₀The individual fields are fields of the same length.

As previously mentioned, according to the above R₀The bit overhead of each of the fields, divided by R in the first portion, may be determined₀Total bit overhead of individual fields. For example, the R₀The total overhead of the individual fields is:

a bit.

Due to the passage of R₀The field indicates the number of transmission layers R, and the RI field originally designed in the CSI report part 1 can be eliminated, so that the bit overhead can be reduced. In other words, the first part of the CSI report does not include the RI field。

It is to be understood that R in the first section is exemplified above₀The bit overhead of each field is only an example, and should not be construed as limiting the application in any way. For example, the R₀Not every field of a field needs to indicate by a predefined value whether a frequency domain vector is reported for the corresponding transport layer. No matter what the number of actual transmission layers is, the 1 st transmission layer is always needed to be used, so the field corresponding to the 1 st transmission layer does not need to indicate whether the frequency domain vector is reported for the transmission layer through a predefined value. The overhead of the field corresponding to the 1 st transport layer may be

A bit. Q^r1,sRepresenting the possible number of values, Q, of the number of frequency domain vectors reported for each space domain vector on the 1 st transport layer^r1,sIs a positive integer. R in the first field thus determined₀The total bit overhead of the individual fields may also be adjusted accordingly. To represent

It should also be understood that the above listed reporting numbers of the pre-configured frequency domain vectors for any two spatial domain vectors on the same transmission layer are the same and the reporting numbers of the frequency domain vectors for any two spatial domain vectors on the same transmission layer are the same only for the convenience of understanding and should not constitute any limitation to the present application.

If the number of the frequency domain vectors reported by the terminal device for any two space domain vectors on the same transmission layer is different, the field corresponding to the transmission layer may be further divided into a plurality of subfields corresponding to the plurality of space domain vectors, each subfield being used to indicate the frequency domain vector reported for the corresponding space domain vectorThe number of the cells. For example, for the r-th₀The reporting quantity of the spatial vectors preconfigured by each transmission layer is L, and then the reporting quantity can be equal to the r₀R th corresponding to each transmission layer₀A field may include L subfields corresponding to L spatial vectors, each subfield being usable to indicate a number of frequency domain vectors reported for the corresponding spatial vector. Since the reporting number of the pre-configured frequency domain vectors for each space domain vector can be predetermined, the bit overhead of the L sub-fields can also be predetermined, and thus the r < th > field ₀The bit overhead of the individual fields may also be predetermined.

Further, when the number of transmission layers is greater than 1, the space vector reported by the terminal device may be shared between layers or may be independent between layers.

If the space vector layers of the multiple transmission layers are shared, the terminal device may report only one set of space vectors for the multiple transmission layers, and may indicate the number of the frequency domain vectors reported for each space vector in the set of space vectors according to the method described above; if the space vector layers of the multiple transmission layers are independent, the terminal device may report a set of space vectors for each transmission layer, and may indicate the number of frequency domain vectors reported for each space vector in the set of space vectors according to the method described above. Whether the space-domain vector can be shared among a plurality of transport layers or not can be predefined by a protocol, or can be informed to a terminal device by signaling in advance by a network device. This is not a limitation of the present application.

Whether the space domain vector can be shared between layers or not, the number of the frequency domain vectors reported by the terminal equipment aiming at each transmission layer can be determined by the R of the bit overhead which can be determined in advance₀A field.

When the space vector layers are independent, the number of the space vectors reported by the terminal equipment for each transmission layer may be the same or different. The reported number of the space domain vectors configured for each transmission layer may be the same or different, and the present application does not limit this. It can be understood that, if the number of frequency domain vectors reported by the terminal device for any two spatial domain vectors on the same transmission layer is different, the number of subfields included in the field corresponding to the transmission layer may be the same as the reporting number of spatial domain vectors preconfigured for the transmission layer.

In this case, R is₀The total bit overhead of each field may also be determined in the same manner as described above, and for brevity, will not be described herein again.

It should be understood that, since the embodiments of the present application mainly relate to reporting of information related to frequency domain vectors, the configuration of the reporting number of null domain vectors and the specific reporting manner are not described in detail herein. For example, reference may be made to the related art, such as the relevant description about the type II (type II) codebook in 3GPP TS38.214 release15 (release15, R15), for configuring the reporting number of spatial vectors and the specific reporting manner.

As can be seen from the above examples, R in the first part₀The total overhead bits of the individual fields are independent of the number of transport layers R. The R is₀The total bit overhead of a field may be determined by the maximum number of transport layers R₀And determining the reporting quantity of the frequency domain vectors preconfigured for each space domain vector on each transmission layer.

In another possible implementation, the first portion may include a fixed bit overhead T₀+1 fields. T is₀Indicating a predefined maximum number of transport layer groups, T₀Is a positive integer.

In such an implementation, R as described above may be used₀Division of transport layer into T₀And a transmission layer group. Each transmission layer group may include one or more transmission layers.

For example, assume a maximum number of transmission layers R₀The 4 transmission layers may be divided into two transmission layer groups, the 1 st transmission layer and the 2 nd transmission layer may be classified as the 1 st transmission layer group, and the 3 rd transmission layer and the 4 th transmission layer may be classified as the 2 nd transmission layer group. Also for example, assume a maximum number of transmission layers R₀To 4, the 4 transmission layers can be divided into three transmission layer groups, the 1 st transmission layer and the 2 nd transmission layer can be classified into the 1 st transmission layer group, the 3 rd transmission layer can be classified into the 2 nd transmission layer group separately, and the 4 th transmission layer can be classified into the 3 rd transmission layer group separatelyA series of layers. It should be understood that the division of the transmission layer group set recited above is only an example, and the division manner of the transmission layer group set is not limited in the present application.

In particular, the T₀T fields in the +1 fields correspond to T transmission layer groups one to one. Each field in the T fields may be used to indicate the number of frequency domain vectors reported by the terminal device for each transport layer in a transport layer group. Taking the T-th field of the T fields as an example, T is more than or equal to 1 and less than or equal to T, and T is an integer. The T field of the T fields can be used to indicate the number M of frequency domain vectors reported by the terminal device for each transport layer in the T transport layer group ^t，M^tIs a positive integer.

Note that T is₀The maximum transmission layer group number which is pre-configured does not represent the actual transmission layer group number and is determined as T₀. The actual number of transmission layer groups may be determined by the actual number of layers determined by the terminal device through channel measurements, e.g. the actual number of transmission layers is denoted R, R ≦ R₀. When R ═ R₀When, it can be considered that the number of transmission layers that can be used is R₀A preconfigured maximum number of transmission layers. The R is₀A transport layer belonging to T₀A transmission layer group, each transmission layer group including R₀One or more of the plurality of transport layers. When R < R₀When, it can be considered that the number of transmission layers that can be used is R, i.e. the rank value is R, and R is another R₀-R transport layers are unused. The R transport layers are attributed to T₀Some or all of the transmission layer groups, e.g. T (T ≦ T)₀And T is a positive integer) transmission layer groups. Each transport layer group includes one or more transport layers of the R transport layers. It should be noted that, when the terminal device indicates the number of the frequency domain vectors to be reported for the T-th transmission layer group, it does not indicate that the terminal device reports the frequency domain vectors for each transmission layer in the T-th transmission layer group, but may determine that the terminal device reports the frequency domain vectors for at least one transmission layer in the T-th transmission layer group, and may determine that the terminal device reports the frequency domain vectors for each transmission layer in each transmission layer group in the first T-1 transmission layer groups.

In the following examples, the compounds with T are introduced₀Corresponding t₀And T corresponding to T. Wherein, t is more than or equal to 1₀≤T₀T is more than or equal to 1 and less than or equal to T. In the following description, reference is made to T₀T in a group of transmission layers₀When there is a transmission layer group, it may specifically mean that the network device assumes that the actual number of transmission layer groups is T₀When is at t₀The transmission layer group refers to the hypothetical T₀T in a group of transmission layers₀And a transmission layer group. In fact, the T-th transmission layer group of the T transmission layer groups and T₀T in a group of transmission layers₀The transmission layer groups indicated by the individual transmission layer groups are the same transmission layer group. Only the T-th transmission layer group of the T transmission layer groups is the transmission layer group actually used, T₀T in a group of transmission layers₀The individual transmission layer groups are hypothetical transmission layer groups. If the number of transmission layer groups is T, when T is₀When taking values from 1 to T, the T-th₀The t transmission layer group may be replaced with the t transmission layer group. So that the arrangement T is designed in the first part₀The number of frequency domain vectors reported by the terminal device for each transmission layer group is indicated by the number field, because the network device does not know the actual number of transmission layers determined by the channel measurement, i.e., does not know the actual number of transmission layer groups. Therefore, it can be assumed that the number of transmission layers is the preconfigured maximum number of transmission layer groups, and a field is reserved for each transmission layer group so that the terminal device indicates the number of frequency domain vectors reported for each transmission layer group.

Also as described above as an example, assume that the maximum number of transmission layers R₀The 4 transmission layers may be divided into two transmission layer groups, the 1 st transmission layer and the 2 nd transmission layer may be classified as the 1 st transmission layer group, and the 3 rd transmission layer and the 4 th transmission layer may be classified as the 2 nd transmission layer group. If the number of actual transmission layers R is 1 or 2, i.e. rank is 1 or 2, then the 1 or 2 transmission layers may be assigned to 1 transmission layer group. A field corresponding to the 1 st transport layer group may be used to indicate the number of frequency domain vectors reported for the 1 st and 2 nd transport layers in the 1 st transport layer group. If the actual number of transmission layers R is 3 or 4, i.e. rank 3 or 4, then the 3 or 4 transmission layers may be assigned to 2 transmission layersAnd the field corresponding to the 1 st transmission layer group of the two transmission layer groups can be used for indicating the number of frequency domain vectors reported by aiming at the 1 st transmission layer and the 2 nd transmission layer in the 1 st transmission layer group, and the field corresponding to the 2 nd transmission layer group can be used for indicating the number of frequency domain vectors reported by the 3 rd transmission layer and the 4 th transmission layer in the 2 nd transmission layer group.

The specific method for indicating the number of the frequency domain vectors reported by the terminal device for each transmission layer in each transmission layer group through the field corresponding to each transmission layer group is similar to the specific method for indicating the number of the frequency domain vectors reported by the terminal device for each transmission layer through the field corresponding to each transmission layer, and is not repeated here for brevity.

Furthermore, with T₀T in each transmission layer group₀The field overhead corresponding to each transport layer group is

A bit. Wherein, among others,

representation for T₀T in a group of transmission layers₀And the number of the selectable values of the number of the frequency domain vectors reported by each transmission layer group. Wherein the content of the first and second substances,

and is a positive integer.

For example, the protocol may predefine an optional value for the number of frequency domain vectors that must be reported by the transport layer in each transport layer group, where the number of the optional value may be less than or equal to

As already described above

As a result of the detailed description, it is,

and

The

The optional value may specifically include for the t₀Corresponding to the number of frequency domain vectors reported in each transmission layer group

Species value and t₀The transmission layer group does not report 1 value of the frequency domain vector.

Alternatively,

has a value of

That is, for the t-th₀The quantity of the frequency domain vectors reported by each transmission layer group comprises from 1 to

This is achieved by

An optional integer value.

How the terminal device specifically passes through

Bit to indicate for the t₀The number of frequency domain vectors reported by each transmission layer in a group of transmission layers, and the frequency domain vector for the tth transmission layer ₀The specific contents of whether the frequency domain vector is reported by each transmission layer group are described in detail above, and are not described herein again for brevity.

To sum up, for the t-th₀A group of transport layers, possibly with overhead of

Field of bits to indicate for the t-th₀The number of frequency domain vectors reported by each transport layer group, wherein,

and is a positive integer.

Alternatively,

furthermore, for T₀The number of frequency domain vectors that must be reported for the transmission layer in each transmission layer group predefined by the protocol may be the same or different, and this is not limited in this application.

However, only by the sum of T₀T corresponding to transmission layer group₀The number field cannot explicitly indicate the number of transmission layers. In this case, an extra field can be added to the T₀The fields collectively indicate the number of transmission layers.

For example, when the number of actual transmission layer is 1 or 2, that is, rank is 1 or 2, the number of reports of the frequency domain vector may be indicated by a field corresponding to the 1 st transmission layer group. Even though the field corresponding to the 2 nd transmission layer group may indicate that the frequency domain vector is not reported by a predefined value, and thus it may be determined that the number of transmission layers is less than 3, the field corresponding to the 1 st transmission layer group may not indicate whether the number of transmission layers is 1 or 2 at all. It may be further indicated by another field that frequency domain vectors are reported for several transport layers of the 1 st transport layer group. For example, when the field is "0", it indicates that the frequency domain vector is reported for only one transmission layer, and it may be determined that the number of transmission layers is 1; when the field is not "1", it indicates that the frequency domain vector is reported for both transmission layers, and it may be determined that the number of transmission layers is 2.

For another example, when the actual number of transmission layers is 3 or 4, the number of reported frequency domain vectors is indicated by fields corresponding to the 1 st transmission layer group and the 2 nd transmission layer group. Since the field corresponding to the 2 nd transmission layer group is not a predefined value, it may be determined that the number of transmission layers is greater than 2. The field corresponding to the 1 st transport layer group may indicate the number of frequency domain vectors reported for the 1 st and 2 nd transport layers, respectively. However, the field corresponding to the 2 nd transmission layer group specifically indicates the number of frequency domain vectors reported by the 3 rd transmission layer or the number of frequency domain vectors reported by the 3 rd and 4 th transmission layers, and only the 2 fields cannot be determined. It may be further indicated by another field that a frequency domain vector is reported for several transport layers in the 2 nd transport layer group. The specific indication manner of the field is shown in the above example, and is not described herein for brevity.

As can be seen from the above example, the field may be used to indicate that the terminal device reports the frequency domain vector for several transport layers in the T-th transport layer group, or may be used to indicate the number of transport layers in one or more transport layers included in the T-th transport layer group that report the frequency domain vector, or may be used to indicate usage of transport layers that may be used in one or more transport layers included in the T-th transport layer.

It should be understood that the specific indication and bit overhead of this field when used to indicate that frequency domain vectors are reported for several transport layers in the tth transport layer group is not limited to those listed above.

Bit overhead of the field and the T₀The maximum number of transmission layers among the number of transmission layers included in each of the transmission layer groups is correlated.

Optionally, the overhead of this field is

A bit. Wherein S represents for T₀A maximum number of transmission layers, specifically for T, preconfigured for each transmission layer group₀And the maximum value of the transmission layer numbers pre-configured by each transmission layer group in the transmission layer groups, wherein S is a positive integer. That is, when t is₀In the range of 1 to T₀Determined for T by the middle traversal value₀T pre-configured for each transmission layer group in a transmission layer group₀Value in number of transmission layersThe maximum number of transmission layers. In other words, when S is the maximum number of transmission layers, T₀The number of transmission layers included in any one transmission layer group in the transmission layer groups is less than or equal to S.

Assuming that the maximum number of transmission layers is S, the data can be transmitted through

The S values in each bit correspond to the S states. E.g. T₀If the maximum transmission layer number preconfigured in each transmission layer group is 2, the T is represented₀The number of transmission layers included in any one transmission layer group in the transmission layer groups does not exceed 2. Assuming that the T-th transport layer group includes 2 transport layers, it may be indicated by 1 bit whether a frequency domain vector is reported for 1 transport layer or 2 transport layers. If "0" indicates that the frequency domain vector is reported for 1 transport layer, and "1" indicates that the frequency domain vector is reported for 2 transport layers. Of course, the T-th transmission layer group may also include only 1 transmission layer. In this case, the field may not be used, or may be filled according to a predetermined rule, for example, "0" may indicate that the frequency domain vector is reported for 1 transport layer, and "1" indicates that the frequency domain vector is not reported.

It is understood that the above-listed are by

The specific method of indicating, by a bit, the number of transmission layers of the frequency domain vector actually reported for the tth transmission layer group is merely an example, and should not be limited in any way in this application.

Based on the above and T₀T corresponding to transmission layer group₀A field, and a number of transmission layers for indicating that the Tth field actually reports the frequency domain vector, the T₀+1 field may be used to jointly indicate the number of transmission layers R, or T₀The +1 field may be used to implicitly indicate the number of transmission layers R.

It can be understood that when the reporting number of the pre-configured frequency domain vectors in each transmission layer group is the same, and the protocol predefines the frequency domain direction which must be reported for each transmission layerThe same number of quantities, the length of the fields configured for any two transport layer groups may be the same. That is, the above-mentioned T₀The bit overhead of any two of the fields may be the same. Or, the T₀The individual fields are fields of the same length.

As previously mentioned, according to T₀The bit overhead of each of the +1 fields may determine T in the first portion₀Total bit overhead of +1 fields. For example, the T₀The total overhead of +1 fields is

A bit.

Due to passing through the T₀The +1 field indicates the number of transmission layers R, and the RI field originally designed in the CSI report part 1 can be eliminated, so that the bit overhead can be reduced. In other words, the first part of the CSI report does not include the RI field.

Therefore, the total bit overhead of the first part of the CSI report may be predetermined.

It should be understood that T in the first section is illustrated above₀The bit overhead of +1 field is only an example and should not be construed as limiting the application in any way. For example, the T₀And T in +1 fields₀T corresponding to each transmission layer₀Not every field of a field needs to indicate whether a frequency domain vector is reported for the corresponding transport layer group by a predefined value. No matter how many actual transmission layer groups are, the 1 st transmission layer always needs to be used, that is, the 1 st transmission layer group always reports the reporting number of the frequency domain vectors. The field corresponding to the 1 st transport layer group does not need to indicate by a predefined value whether a frequency domain vector is reported for this transport layer group. Therefore, it is paired with the 1 st transmission layer The overhead of the corresponding field may be

A bit. Q^t1The number of selectable values, Q, representing the number of frequency domain vectors reported for each transport layer in the 1 st transport layer group^t1Is a positive integer. T in the first field thus determined₀The total bit overhead of +1 fields may also be adjusted accordingly.

As can be seen from the above examples, T in the first section₀The total overhead bits of the +1 fields are independent of the number of transport layers R. The T is₀The total bit overhead of +1 fields may be defined by the maximum number of transport layer groups T₀Is T₀And determining the maximum transmission layer number pre-configured by the transmission layer groups and the reporting number of the frequency domain vectors pre-configured for each transmission layer in each transmission layer group.

As another example, the number of frequency domain vectors reported for each spatial domain vector on each transmission layer in each transmission layer group may be preconfigured. For example, pre-configured by the network device through signaling, or predefined by the protocol. This is not a limitation of the present application.

Optionally, the method further comprises: the terminal equipment receives first indication information, and the first indication information is used for indicating that the T is aimed at₀And reporting quantity of the frequency domain vectors preconfigured by each space domain vector on each transmission layer in the transmission layer groups. Accordingly, the network device transmits the first indication information. That is, the reporting number of frequency domain vectors preconfigured for each space domain vector on each transport layer in each transport layer group is configured by the network device.

The number of the airspace vectors reported by the terminal equipment aiming at each transmission layer can be less than or equal to the reporting number of the preconfigured airspace vectors. Taking the r-th transmission layer as an example, the number of the spatial vectors actually reported by the terminal device for the r-th transmission layer may be less than or equal to that for the r-th transmission layer₀And reporting the spatial vector preset by each transmission layer.

In one possible design, the reporting number of the frequency domain vectors preconfigured for any two space domain vectors on each transmission layer in the same transmission layer group is the same. In other words, for the same group of transmission layers (e.g. t-th ₀Groups of transmission layers) the reported number of frequency domain vectors per space domain vector configuration on each transmission layer can be represented by the same parameter, e.g., above

Corresponding to a transmission layer group and a space vector.

Correspondingly, the number of frequency domain vectors actually reported by the terminal device for any two space domain vectors in each transmission layer is also the same. In other words, the number of frequency domain vectors reported for each space domain vector on the same transport layer (e.g., the r-th transport layer) can be represented by the same parameter, for example, denoted as M^t,s，M^t,sIs a positive integer.

Even if the number of the frequency domain vectors corresponds to one transmission layer, one space domain vector, by the T₀The field can still indicate the frequency domain reported by the terminal equipment for each transmission layer in each transmission layer groupThe number of vectors. For example, suppose t₀Each transmission layer group comprises two transmission layers, and the number of the space domain vectors reported by the 1 st transmission layer in the two transmission layers is L₁The number of space domain vectors reported for the 2 nd transmission layer of the two transmission layers is L₂. The terminal device is directed to the t ₀The total number of frequency domain vectors reported by each transmission layer group does not exceed the total number of frequency domain vectors reported by each transmission layer group

And (4) respectively.

It should be understood that the number of space vectors reported for different transport layers in the same transport layer group may be the same or different. This is not a limitation of the present application. If the number of space-domain vectors reported for different transmission layers in the same transmission layer group is the same, the above L₁＝L₂. That is, the terminal device is directed to the t₀The total number of frequency domain vectors reported by each transmission layer group does not exceed the total number of frequency domain vectors reported by each transmission layer group

And (4) respectively.

For the t-th₀A group of transport layers, possibly with overhead of

Field of bits to indicate for the t-th₀The number of frequency domain vectors reported by each space domain vector on each transmission layer group, wherein,

As already described above

As a result of the detailed description, it is,

and

Alternatively,

how the terminal device specifically passes through

One bit to indicate for that t₀The number of frequency domain vectors reported by each transmission layer in a group of transmission layers, and the frequency domain vector for the tth transmission layer ₀The specific contents of whether the frequency domain vector is reported by each transmission layer group are described in detail above. In this example, by

One bit to indicate for that t₀The number of frequency domain vectors reported by each space domain vector on each transmission layer in a group of transmission layers and for the tth₀The method for determining whether the transmission layer group reports the specific content of the frequency domain vector is similar to the method, and for brevity, the detailed description is omitted here.

It should be noted that although the terminal device passes the t-th₀Individual field indication for t₀The number of frequency domain vectors reported for each space vector on each transport layer in a group of transport layers, but since the number of space vectors reported for each transport layer can be predetermined, e.g., pre-configured by the network device or pre-defined by the protocol, it can be deduced that the number of frequency domain vectors reported for t₀The number of frequency domain vectors reported by each transmission layer in the transmission layer group.

Field of bits to indicate for the t-th₀The number of frequency domain vectors reported by each transport layer in a group of transport layer, wherein,

and is a positive integer. Alternatively,

It can be understood that, when the number of frequency domain vectors that are preconfigured for each transport layer in each transport layer group is the same, and the number of frequency domain vectors that have to be reported and are predefined by the protocol for each transport layer is the same, the length of the field configured for any two transport layers may be the same. That is, the above-mentioned T₀The bit overhead of any two of the fields may be the same. Or, the T₀The individual fields are fields of the same length.

A bit.

It should be understood that T in the first section is illustrated above₀The bit overhead of +1 field is only an example and should not be construed as limiting the application in any way. For example, the T₀And T in +1 fields₀T corresponding to each transmission layer₀Not every field of a field needs to indicate whether a frequency domain vector is reported for the corresponding transport layer group by a predefined value. No matter how many actual transmission layer groups are, the 1 st transmission layer always needs to be used, that is, the 1 st transmission layer group always reports the reporting number of the frequency domain vectors. The field corresponding to the 1 st transport layer group does not need to indicate by a predefined value whether a frequency domain vector is reported for this transport layer group. The overhead of the field corresponding to the 1 st transport layer may be

A bit. Q^t1,sRepresenting the possible number of values, Q, of the number of frequency domain vectors reported for each frequency domain vector on each transmission layer in the 1 st transmission layer group^t1,sIs a positive integer. T in the first field thus determined₀The total bit overhead of +1 fields may also be adjusted accordingly.

As can be seen from the above examples, T in the first section ₀The total overhead bits of the +1 fields are independent of the number of transport layers R. The T is₀The total bit overhead of +1 fields may be defined by the maximum number of transport layer groups T₀Is T₀And determining the maximum transmission layer number pre-configured by the transmission layer groups and the frequency domain vector reporting number pre-configured by each space domain vector on each transmission layer in each transmission layer group.

In another possible implementation manner, the first portion may include an index value, where the index value is used to indicate the number of frequency domain vectors and the number R of transmission layers reported for each of the R transmission layers.

In particular, the index value may be taken from a plurality of index values that are preconfigured. The plurality of index values may correspond to a plurality of parameter sets. Each parameter set may include a number of transmission layers and a number of frequency domain vectors reported for each transmission layer. Alternatively, each parameter set may include one number of transmission layers and the number of frequency domain vectors reported for each spatial domain vector on each transmission layer.

In the above embodiment, it has been explained that the number of frequency domain vectors reported for any two space domain vectors on the same transmission layer is the same. Therefore, even if the number of frequency domain vectors included in each parameter group is the number of frequency domain vectors reported for each space domain vector on each transmission layer, the number of frequency domain vectors reported for each transmission layer can still be calculated. For example, the number of frequency domain vectors reported for each space domain vector on the r-th transport layer is M ^r,sif the number of space domain vectors reported for the r-th transport layer is L, it can be calculated that the number of frequency domain vectors reported for the r-th transport layer is lxm^r,s。

Table 1 below shows an example of a plurality of index values and a plurality of parameter groups. Specifically, table 1 shows, by 30 index values, the number of frequency domain vectors respectively reported for each space domain vector on each transmission layer/each transmission layer when the number of transmission layers is 1, 2, 3, and 4, respectively. Each index value indicates the number of transmission layers and also indicates the number of frequency domain vectors reported by aiming at each transmission layer. In table 1, it is assumed that the maximum value of the reporting number of frequency domain vectors preconfigured by the network device for each space domain vector on each transmission layer/each transmission layer is 2.

TABLE 1

Indexing	Number of transmission layers R	M¹/M^1,s	M²/M^2,s	M³/M^3,s	M⁴/M^4,s
						0	1	1
1	1	2
						2	2	1	1
3	2	1	2
						4	2	2	1
5	2	2	2
						6	3	1	1	1
7	3	1	1	2
						8	3	1	2	1
9	3	1	2	2
						10	3	2	1	1
11	3	2	1	2
						12	3	2	2	1
13	3	2	2	2
						14	4	1	1	1	1
15	4	1	1	1	2
						16	4	1	1	2	1
17	4	1	1	2	2
						18	4	1	2	1	1
19	4	1	2	1	2
						20	4	1	2	2	1
21	4	1	2	2	2
						22	4	2	1	1	1
23	4	2	1	1	2
						24	4	2	1	2	1
25	4	2	1	2	2
						26	4	2	2	1	1
27	4	2	2	1	2
						28	4	2	2	2	1
29	4	2	2	2	2

Note that the number of transmission layers R in the table may be replaced by a rank (rank). In table M¹/M^1,s、M²/M^2,s、M³/M³ ^,sAnd M⁴/M^4,sThe number of frequency domain vectors reported for each transport layer, or the number of frequency domain vectors reported for each spatial domain vector on each transport layer, respectively, may be represented. In the table, "/" is used to distinguish different meanings of each parameter.

As previously mentioned, the maximum value of the number of frequency domain vectors reported for each transport layer may be determined by coefficients preconfigured for each transport layer. That is to say that the first and second electrodes,

p_0,rIs a coefficient pre-configured for the r-th transmission layer, and can be used for representing the number of frequency domain vectors actually reported and a pre-configured value M_0,rThe proportional relationship of (c). M_0,rThe maximum value of the reporting quantity of the frequency domain vectors which are pre-configured aiming at the r-th transmission layer.

The correspondence of the index values to the parameter groups may also be as shown in table 2 below. In table, p_rIs a technique for determining the number of frequency domain vectors reported for each transport layer, i.e.,

it is to be understood that p in Table 2_0,rCan be replaced by a pre-configured value M_0,r。

TABLE 2

Indexing	Number of transmission layers R	p₁	p₂	p₃	p₄
						0	1	p_0,1
1	1	p_0,1/2
						2	2	p_0,1	p_0,2
3	2	p_0,1	p_0,2/2
						4	2	p_0,1/2	p_0,2
5	2	p_0,1/2	p_0,2/2
						6	3	p_0,1	p_0,2	p_0,3
7	3	p_0,1	p_0,2	p_0,3/2
						8	3	p_0,1	p_0,2/2	p_0,3
9	3	p_0,1	p_0,2/2	p_0,3/2
						10	3	p_0,1	p_0,2	p_0,3
11	3	p_0,1/2	p_0,2	p_0,3/2
						12	3	p_0,1/2	p_0,2/2	p_0,3
13	3	p_0,1/2	p_0,2/2	p_0,3/2
						14	4	p_0,1	p_0,2	p_0,3	p_0,4
15	4	p_0,1	p_0,2	p_0,3	p_0,4/2
						16	4	p_0,1	p_0,2	p_0,3/2	p_0,4
17	4	p_0,1	p_0,2	p_0,3/2	p_0,4/2
						18	4	p_0,1	p_0,2/2	p_0,3	p_0,4
19	4	p_0,1	p_0,2/2	p_0,3	p_0,4/2
						20	4	p_0,1	p_0,2/2	p_0,3/2	p₀,4
21	4	p_0,1	p_0,2/2	p_0,3/2	p_0,4/2
						22	4	p_0,1/2	p_0,2	p_0,3	p_0,4
23	4	p_0,1/2	p_0,2	p_0,3	p_0,4/2
						24	4	p_0,1/2	p_0,2	p_0,3/2	p_0,4
25	4	p_0,1/2	p_0,2	p_0,3/2	p_0,4/2
						26	4	p_0,1/2	p_0,2/2	p_0,3	p_0,4
27	4	p_0,1/2	p_0,2/2	p_0,3	p_0,4/2
						28	4	p_0,1/2	p₀/2	p_0,3/2	p_0,4
29	4	p_0,1/2	p₀/2	p_0,3/2	p_0,4/2

It should be understood that the above listed tables 1 and 2 are only two examples of the correspondence between the index values and the parameter sets, and should not limit the present application in any way. The present application is not limited to the specific number of index values (or parameter sets) and the specific values of the parameters in each parameter set.

It should also be understood that the various parameters shown in the tables are examples only. Each parameter set may also include only a part of the parameters, for example, only the number of frequency domain vectors reported for each transmission layer is included in the parameter set, and the number of transmission layers is not included in the parameter set, which is exemplified below. Those skilled in the art can make equivalent modifications or substitutions based on the table illustrated above based on the same concept, and the modifications or substitutions are all within the scope of protection of the present application.

The bit overhead of the index value is explained in detail below.

In this embodiment, the bit overhead of the index value may in fact be determined by a predefined maximum number of transmission layers R₀And determining the reporting quantity of the frequency domain vectors preconfigured for each transmission layer. The bit overhead of the index value may be predetermined. Furthermore, it can be seen that the bit overhead of the index value is independent of the number of transport layers R.

Assuming that the maximum number of transmission layers is R₀Is of r₀The reporting quantity of the frequency domain vectors preconfigured by each transmission layer is

Is a positive integer. For the r-th₀The number of frequency domain vectors reported by each transmission layer can be

And possible values. Then, for R₀1 st to R-th transport layers among the transport layers₀The number of frequency domain vectors reported by each transmission layer can be

Possible values, i.e.

And (6) carrying out value selection. Can thus be configured

And each parameter set can represent the reporting number of the frequency domain vectors configured for each transmission layer under the condition of one value of the transmission layer number R.

It is to be understood that the above are enumerated

The values of (a) may be the same. NetworkThe device may be configured with only one value, such as the preconfigured value M described above₀Or a coefficient, e.g. p₀The same value is used for each transport layer.

The values of the network equipment and the terminal equipment can be different, and the network equipment and the terminal equipment can preset the rule and preset the value M₀The reporting number of frequency domain vectors configured for each transport layer is determined.

The

The parameter set can be passed

The index values of the bits correspond to each other, and each value corresponds to a parameter group, that is, a value corresponding to the number of transmission layers and the number of frequency domain vector reports configured for each transmission layer under the condition corresponding to the number of transmission layers.

In table 1 shown above, it is assumed that the maximum value of the number of frequency domain vectors reported for each of the 4 transport layers or each space vector on each transport layer is 2, i.e., the number of frequency domain vector reports preconfigured for each transport layer is 2, i.e., the number of frequency domain vectors reported is 2

i is traversed in 1 to 4. Thus can pass through

One (i.e., 5) bits to carry the index value.

In addition, the

Corresponding to a parameter set

Of the index values, index values 0 to

Can correspond to a plurality of possible values of the reported number of the time-frequency domain vectors with the transmission layer number of 1, and index values

To

Can correspond to the combination of multiple possible values of the reported number of the time-frequency domain vectors with the transmission layer number of 2, and the index value

To

May correspond to a combination of a plurality of possible values of the reported number of time-frequency domain vectors for which the number of transmission layers is 3,

To

The number of the reported time-frequency domain vectors can be combined with a plurality of possible values corresponding to the number of the reported time-frequency domain vectors with the number of transmission layers of 4.

Therefore, for each index value, the corresponding number of transmission layers can be determined through the value interval to which the index value belongs. The parameter set corresponding to each index value may include the number of transmission layers, or may not include the number of transmission layers, but only include the number of frequency domain vectors reported for each transmission layer. In other words, each parameter set may include the number of frequency domain vectors reported for each of the R transport layers.

Considering that the protocol may predefine the number of selectable values of the reported number of frequency domain vectors configured for each space domain vector on each transport layer, the overhead of the index value may be

Different. Wherein Q isⁱIs shown for R₀The number of the selectable values of the number of the frequency domain vectors reported by the ith transmission layer in each transmission layer.

By a predefined value QⁱThe number of possible values of the frequency domain vector quantity reported by the terminal device can be smaller than or equal to the preconfigured frequency domain vector reporting quantity. I.e. for the r-th₀A plurality of transmission layers, each of which is a transmission layer,

thereby the bit overhead of the fields can be further reduced.

has a value of

Correspondingly, if each parameter set includes the number of frequency domain vectors reported for each space domain vector on each transmission layer, the overhead of the index value may also be determined according to the method described above.

Assuming that the maximum number of transmission layers is R₀To the r < th > r₀The reporting quantity of the frequency domain vectors configured by each space domain vector on each transmission layer is

Is a positive integer. For the r-th₀The number of the frequency domain vectors reported by each space domain vector on each transmission layer can be

And possible values. Then, for R₀1 st to R-th transport layers among the transport layers₀The number of the frequency domain vectors reported by each space domain vector on each transmission layer can be

A possible combination, i.e.

Possible combinations are described. Can thus be configured

A set of parameters, and the

The combination is corresponding. Each parameter set may represent the number of frequency domain vector reports configured for each transmission layer for one value of the number of transmission layers R.

The

The parameter set can be passed

In addition, the

Corresponding to a parameter set

Of the index values, index values 0 to

To

To

to

Therefore, for each index value, the corresponding number of transmission layers can be determined through the value interval to which the index value belongs. The parameter set corresponding to each index value may include the number of transmission layers, or may not include the number of transmission layers, but only include the number of frequency domain vectors reported for each transmission layer. In other words, each parameter set may include the number of frequency domain vectors reported for each spatial vector on each of the R transport layers.

Considering that the protocol may predefine the selectable number of reported frequency domain vectors configured for each space domain vector on each transport layer, the overhead of the index value may be

Different. Wherein Q is^i,sIs shown for R₀The number of selectable values of the number of frequency domain vectors reported by each space domain vector on the ith transmission layer in the transmission layers. I is more than or equal to 1 and less than or equal to r₀，1≤r₀≤R₀And i, r₀Is an integer, Q^i,sIs a positive integer.

By a predefined value Q^i,sThe frequency reported by the terminal equipment can be enabledThe number of possible values of the number of the domain vectors may be less than or equal to the number of pre-configured frequency domain vector reports. I.e. for the r-th₀A plurality of transmission layers, each of which is a transmission layer,

thereby the bit overhead of the fields can be further reduced.

has a value of

In fact, each parameter set corresponding to the index value may also include the number of transmission layers and the number of frequency domain vectors reported for each transmission layer group. In this case, the number of frequency domain vectors reported by the terminal device for different transmission layers in each transmission layer group may be the same.

The above listed table 1 can be simplified to the table 3 below.

TABLE 3

Indexing	Number of transmission layers R	M¹/M^1,s	M²/M^2,s	M³/M^3,s	M⁴/M^4,s
						0	1	1
1	1	2
						2	2	1	1
3	2	2	2
						4	3	1	1	1
5	3	1	1	2
						6	3	2	2	1
7	3	2	2	2
						8	4	1	1	1	1
9	4	1	1	2	2
						10	4	2	2	1	1
11	4	2	2	2	2

In this case, the bit overhead of the index value may be 4 bits. Based on the several possible implementations provided above, the bit overhead of the first part can be predetermined regardless of the actual number of transport layers R.

In addition, the CSI report further includes a second part. The second part may include indication information of space-domain vectors, frequency-domain vectors, and space-frequency combining coefficients reported for each transport layer. The space-domain vector, the frequency-domain vector and the space-frequency combination coefficient reported by each transmission layer can be used for constructing a precoding vector corresponding to the frequency-domain unit on each transmission layer.

When indicating the spatial vector and the frequency domain vector, the terminal device may indicate, for example, an index of each spatial vector and an index of each frequency domain vector selected to construct a precoding vector on the r-th transmission layer, respectively, for the r-th transmission layer, or may indicate, for the r-th transmission layer, an index of a combination of spatial vectors and an index of a combination of frequency domain vectors selected to construct a precoding vector on the r-th transmission layer, respectively.

The terminal device may indicate the quantized value of the space-frequency combining coefficient, for example, when indicating the space-frequency combining coefficient. In addition, the terminal device may also indicate the position of each space-frequency combination coefficient by means of, for example, a bitmap. The space and frequency domain vectors corresponding to each space-frequency combining coefficient may be determined based on the position of the space-frequency combining coefficient.

It should be understood that the specific methods for indicating the space-domain vector, the frequency-domain vector and the space-frequency combining coefficient by the terminal device listed above are only examples, and should not limit the present application in any way. For the specific method for the terminal device to indicate the space-domain vector, the frequency-domain vector, and the space-frequency combination coefficient, reference may be made to the prior art, and details are not repeated here for brevity.

In step 220, the terminal device transmits the CSI report. Correspondingly, the network device receives the CSI report.

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), so that the network device determines, based on the CSI report, a space-frequency vector pair reported for each transmission layer, so as to recover a precoding vector corresponding to each frequency domain vector on each transmission layer.

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 precoding vectors corresponding to the frequency domain elements on each transmission layer according to the CSI report.

Specifically, the network device may first determine the number of frequency domain vectors reported for each of the R transport layers from the first portion of the CSI report.

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 number of frequency domain vectors reported by the terminal device for each of the R transport layers may be determined.

The specific process of the terminal device indicating the number of frequency domain vectors reported for each of the R transmission layers through the CSI report has been described in detail in step 210 above. The specific process of the network device determining the number of frequency domain vectors reported for each of the R transport layers according to the first part is similar to that of the first part, and a detailed description of the specific process is omitted here for the sake of brevity.

Thereafter, the network device may determine, according to the number of frequency-domain vectors reported for each transport layer determined by the first portion, an indication overhead for indicating relevant information of the frequency-domain vectors in the second portion of the CSI report, and then determine a length of the second portion of the CSI report, and then decode the second portion.

The network device may determine a frequency domain vector reported for each transport layer based on the second portion. The frequency domain vector, the space domain vector and the space-frequency merging coefficient reported by the same transmission layer can be used for constructing the precoding vector corresponding to each frequency domain unit on the transmission layer.

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 the r-th transmission layer as an example, the network device may determine a frequency domain vector corresponding to the r-th transmission layer according to the CSI report, and the frequency domain vector corresponding to the r-th transmission layer and the space domain vector corresponding to the r-th transmission layer may construct a plurality of space-frequency component matrices. And weighting and summing the plurality of space-frequency component matrixes based on the space-frequency merging coefficient corresponding to the r-th transmission layer to obtain a space-frequency matrix corresponding to the r-th transmission layer, and further determining precoding vectors corresponding to the frequency domain units on the r-th transmission layer.

The specific method for determining the precoding vector corresponding to each frequency domain unit by the network device according to the space vector pair and the space-frequency combining coefficient corresponding to the r-th transmission layer has been described in detail above, and for the sake of brevity, detailed description of the specific process is omitted here.

Optionally, the network device may further determine a precoding matrix corresponding to each frequency domain unit.

Based on the determination of the nth (1 ≦ N ≦ N) for each transport layer₃And n is an integer) of the precoding vectors determined by the frequency domain units can construct a precoding matrix corresponding to the nth frequency domain unit. For example, the precoding vectors corresponding to the nth frequency domain unit are sequentially arranged according to the sequence from the 1 st transmission layer to the R th transmission layer in the R transmission layers, and normalization processing is performed, so as to obtain a precoding matrix corresponding to the nth frequency domain unit. Wherein N is₃Number of frequency domain units, N, representing PMI to be reported₃Is a positive integer.

It should be understood that the above-described method for determining a precoding vector corresponding to each frequency domain unit on each transmission layer based on the spatial vector, the frequency domain vector and the space-frequency combining coefficient indicated in the CSI report, and then determining a precoding matrix corresponding to each frequency domain unit is only an example, and should not constitute any limitation to the present application. The specific method for determining the precoding matrix based on the space-domain vector, the frequency-domain vector and the space-frequency combination coefficient by the network equipment is not limited in the application.

Based on the above technical solution, the terminal device may indicate the number of transmission layers and the number of frequency domain vectors reported for each transmission layer through the first part of the CSI report. By designing one or more fields capable of determining bit overhead in advance for the first part, the network device can decode the first part according to the bit overhead determined in advance, so as to obtain the information therein to determine the bit overhead of the second part, and then correctly decode the second part. Through the design, the network equipment can correctly decode the first part and the second part of the CSI report, and further obtain the CSI fed back by the terminal equipment. Because the CSI fed back by the terminal equipment is determined based on the downlink channel measurement, the CSI can be well adapted to the downlink channel, and therefore the network equipment is facilitated to determine the precoding matrix for data transmission adapted to the downlink channel. Thereby achieving the effect of improving the data transmission performance. In addition, the number of transmission layers is implicitly indicated through the one or more fields, and the RI field in the existing CSI report can be eliminated, thereby being beneficial to reducing the bit overhead of the first part of the CSI report.

Fig. 3 is a schematic flow chart diagram of a method 300 for indicating CSI shown from the perspective of device interaction provided by another embodiment of the present application. As shown, the method 300 includes steps 310 through 330. The steps in method 300 are described in detail below.

In step 310, the terminal device generates a CSI report.

As previously described, the CSI report may include a first portion and a second portion. For reporting the space-frequency merging coefficients, the first part may include at least a plurality of fields whose bit overhead may be predetermined, so as to indicate the number of space-frequency merging coefficients reported by the terminal device for each of the R transport layers; in addition, the multiple fields in which the bit overhead can be predetermined can also be used to implicitly indicate the number of transmission layers R. The second part may include space-frequency combining coefficients and their positions reported by the terminal device for each transport layer.

It should be understood that the information contained in the first and second parts referred to above is only information related to the reporting of the space-frequency combining coefficients, and does not represent all the information contained in the first and second parts. For example, the first portion may also include CQI. For another example, the second part may further include information indicating a space domain vector, information indicating a frequency domain vector, and the like. This is not a limitation of the present application. It should be noted that, in the present embodiment, the number of transmission layers R may be implicitly indicated by the above-mentioned fields, and need not be indicated by an additional field (e.g., RI).

A specific method for indicating the number of space-frequency combining coefficients and the number of transmission layers reported for each transmission layer through a plurality of fields that can be predetermined by bit overhead in the first section is described in detail below.

In another possible implementation, the first portion may include a fixed bit overhead R₀A field. R₀Indicating a predefined maximum number of transmission layers, R₀Is a positive integer.

Specifically, the R₀Each field canWith R₀The transport layers correspond. The R is₀R fields of the fields correspond to the actual number R of transmission layers. Each field may be used to indicate the number of space-frequency combining coefficients that the terminal device reports for one of the R transport layers. Taking the R-th field of the R fields as an example, R is more than or equal to 1 and less than or equal to R, and R is an integer. Then the R field of the R fields can be used to indicate the number K of space-frequency merging coefficients reported by the terminal device for the R transport layer^r，K^rIs a positive integer. The R is₀Remaining R in the individual field₀-R fields are predefined values indicating that no space-frequency combining coefficients are reported for the corresponding transport layer; the R is₀The number field is used to implicitly indicate the number of transmission layers R.

In addition, R is₀The maximum transmission layer number is not determined to be R, which does not represent the actual transmission layer number ₀. The actual number of transmission layers can be determined by the terminal equipment by channel measurements, for example denoted R, R ≦ R₀. When R < R₀When, it can be considered that the number of transmission layers that can be used is R, and R is another₀-R transport layers are not available or are not present.

In this embodiment, the first and second electrodes are connected to₀R th corresponding to each transmission layer₀Overhead of a field is

A bit.

And is

And

are all positive integers. Wherein the content of the first and second substances,

is shown for R₀R in transport layer₀The number of selectable values of the number of space-frequency merging coefficients reported by each transmission layer,

is shown for R₀R in transport layer₀And reporting the number of the space-frequency merging coefficients preconfigured by each transmission layer.

Terminal equipment through

A bit to indicate whether to the r-th₀The space-frequency merging coefficient is reported by each transmission layer and the r₀The specific method of the number of space-frequency combining coefficients reported by each transport layer and the terminal device in the above embodiments

A bit to indicate for the r₀Whether or not a frequency domain vector is reported by each transport layer and for the r-th₀The specific method of the number of frequency domain vectors reported by each transport layer is similar. Only the frequency domain vector is replaced by a space-frequency merging coefficient, and P is replaced by Q. A detailed description of this particular method is omitted here for the sake of brevity.

Wherein, with r₀R th corresponding to each transmission layer₀A field can have

And optional values are selected. The

Alternative values may include for the r-th value₀Number of space-frequency combining coefficients reported by each transport layer

The value of the species and the indication as to the r₀The 1 value of the space-frequency merging coefficient is not reported by each transmission layer.

R is₀Of a field

Alternative values and meanings indicated above for the r-th value₀Of a field

Alternative values and representations thereof are similar, except that the frequency domain vector is replaced by a space-frequency combining coefficient, and a detailed description thereof is omitted here for the sake of brevity.

Alternatively,

has a value of

That is, for the r-th₀The quantity of the frequency domain vectors reported by each transmission layer comprises from 1 to

This is achieved by

An optional integer value.

Wherein for the r₀Number of space-frequency merging coefficients pre-configured for each transmission layer

May be pre-configured. For example, the network device is pre-configured through signaling, or the protocol is predefined, and the terminal device is pre-configured before factory shipment. This is not a limitation of the present application.

Optionally, the method further comprises: the terminal equipment receives second indication information, and the second indication information is used for indicating the R₀And reporting the number of the space-frequency merging coefficients preconfigured by each transmission layer in the transmission layers. Accordingly, the network device transmits the first indication information. That is, the reporting number of the space-frequency combining coefficients preconfigured for each transport layer is configured by the network device.

As previously describedAccording to the above R₀The bit overhead of each of the fields may be used to determine R in the first portion₀Total bit overhead of individual fields. For example, the R₀The total overhead of the individual fields is:

a bit.

Due to the passage of R₀The field indicates the number of transmission layers R, and the RI field originally designed in the CSI report part 1 can be eliminated, so that the bit overhead can be reduced. In other words, the first part of the CSI report does not include the RI field.

A bit.

The possible number of values representing the number of space-frequency merging coefficients reported by aiming at the 1 st transmission layer,

is a positive integer. R in the first field thus determined₀The total bit overhead of the individual fields may also be adjusted accordingly.

In such an implementation, R as described above may be used₀Division of transport layer into T₀And a transmission layer group. Each transmission layer group may include one or more transmission layers. The division of the transmission layer group and the transmission layer has been illustrated above, and for brevity, the description is omitted here.

Specifically, the T₀T in +1 fields₀Each field and T₀The transmission layer groups correspond. The T is₀T fields of the fields correspond to the actual transport layer group number T. Each field may be used to indicate the number of space-frequency combining coefficients reported by the terminal device for each transport layer in one transport layer group of the T transport layer groups. Taking the T-th field of the T fields as an example, T is more than or equal to 1 and less than or equal to T, and T is an integer. The T field of the T fields can be used to indicate the number K of space-frequency combining coefficients reported by the terminal device for each transport layer in the T transport layer group ^t，K^tIs a positive integer. The T is₀The rest of T in each field₀-T fields are predefined values indicating that no space-frequency combining coefficients are reported for transmission layers in the corresponding transmission layer group; the T is₀The number field is used to implicitly indicate the number of transmission layers T.

Note that T is₀The maximum transmission layer group number which is pre-configured does not represent the actual transmission layer group number and is determined as T₀. The actual number of transmission layers can be determined by the terminal device by means of channel measurements, for example denoted T, T ≦ T₀. When T is less than T₀In this case, it can be considered that the number of transmission layers that can be used is the number of transmission layers R included in the first T transmission layer groups, and T is another₀-a transport layer of the T transport layer groups is not available or is not present.

In the present embodiment, the t-th₀T-th corresponding to transmission layer group₀Overhead of a field is

A bit.

And is

And

representation for T₀T in a group of transmission layers₀And reporting the number of the space-frequency merging coefficients preconfigured by each transmission layer in the transmission layer groups.

Terminal equipment through

Bit to indicate whether or not to target the t₀The space-frequency merging coefficient is reported by each transmission layer group and the t-th coefficient is reported₀The specific method of the number of space-frequency combining coefficients reported by each transmission layer group and the terminal device in the above embodiment

Bit to indicate for the t₀Whether a transmission layer group reports a frequency domain vector and for the second transmission layer groupt₀The specific method of the number of frequency domain vectors reported by each transmission layer group is similar. Only the frequency domain vector is replaced by a space-frequency merging coefficient, and P is replaced by Q. A detailed description of this particular method is omitted here for the sake of brevity.

Wherein, with the t₀T-th corresponding to transmission layer group₀A field can have

And optional values are selected. The

Alternative values may include for the t₀Number of space-frequency merging coefficients reported by transmission layer group

Seed value and for indication as to the t₀The transmission layer group does not report 1 value of the space-frequency merging coefficient.

T th₀Of a field

Alternative values and meanings indicated above for the t₀Of a field

Alternatively,

Has a value of

This is achieved by

An optional integer value.

Wherein for the t₀Number of space-frequency merging coefficients pre-configured for transmission layer group

Optionally, the method further comprises: the terminal equipment receives second indication information, and the second indication information is used for indicating that the T is aimed at₀And reporting the number of the space-frequency merging coefficients pre-configured for each transmission layer group in the transmission layer groups. Accordingly, the network device transmits the first indication information. That is, the reporting number of the space-frequency combining coefficients preconfigured for each transmission layer group is configured by the network device.

As previously mentioned, according to T₀The bit overhead of each field of T transport layer groups T in the fields can be determined₀Total bit overhead of individual fields. For example, the T₀The total overhead of the individual fields is:

a bit.

Due to the passage of T₀The TI field originally designed in CSI report pat 1 can be eliminated, and thus bit overhead can be reduced. In other words, the first part of the CSI report does not include the TI field.

In addition, as described above, other fields may also be included in the first part of the CSI report, for example, the CQI field in the CSI report pat 1 was originally designed. The bit overhead may also be predetermined since other fields may follow the prior art design for CSI report pat 1.

It should be understood that T in the first section is illustrated above₀The bit overhead of each field is only an example, and should not be construed as limiting the application in any way. For example, the T₀Not every field in a field needs to indicate by a predefined value whether a frequency domain vector is reported for the corresponding transport layer group. No matter how many actual transmission layer groups are, the 1 st transmission layer group is always needed to be used, so that a field corresponding to the 1 st transmission layer group does not need to indicate whether a frequency domain vector is reported for the transmission layer group through a predefined value. The overhead of the field corresponding to the 1 st transport layer group may be

A bit. P^t1The possible value number P representing the number of space-frequency merging coefficients reported by each transmission layer in the 1 st transmission layer group^t1Is a positive integer. T in the first field thus determined ₀The total bit overhead of the individual fields may also be adjusted accordingly.

In step 320, the terminal device sends a CSI report. Accordingly, the network device receives the CSI report.

The specific process of step 320 is the same as the specific process of step 220 in method 200 above. For brevity, no further description is provided herein.

In step 330, the network device determines precoding vectors corresponding to the frequency domain units on each transmission layer according to the CSI report.

Specifically, the network device may first determine, according to the first part of the CSI report, the number of space-frequency combining coefficients reported for each of the R transport layers.

The specific process that the terminal device indicates the number of space-frequency combining coefficients reported for each of the R transmission layers through the CSI report has been described in detail in step 210 above. The specific process of the network device determining the number of space-frequency combining coefficients reported for each of the R transport layers according to the first part is similar to that of the first part, and a detailed description of the specific process is omitted here for brevity.

Thereafter, the network device may determine, according to the number of space-frequency combining coefficients reported for each transport layer determined by the first part, an indication overhead for indicating related information of the space-frequency combining coefficients in the second part of the CSI report, and further determine a length of the second part of the CSI report, and decode the second part.

The network device may determine the space-frequency combining coefficient reported for each transport layer according to the second portion. The space-frequency combination coefficient, the space vector and the frequency domain vector reported by the same transmission layer can be used for constructing the precoding vector corresponding to each frequency domain unit on the transmission layer.

Taking the r-th transmission layer as an example, the network device may determine, according to the CSI report, a space-frequency combining coefficient corresponding to the r-th transmission layer, and a space-frequency vector and a frequency-domain vector corresponding to the r-th transmission layer, which may be used to construct a space-frequency matrix corresponding to the r-th transmission layer, and may further determine a precoding vector corresponding to each frequency-domain unit on the r-th transmission layer.

The specific process of the network device determining the precoding matrix corresponding to each frequency domain unit has been described in detail in the above method 200, and for brevity, the description is omitted here.

Based on the above technical solution, the terminal device may indicate the number of transmission layers and the number of space-frequency combining coefficients reported for each transmission layer through the first part of the CSI report. By designing one or more fields capable of determining bit overhead in advance for the first part, the network device can decode the first part according to the bit overhead determined in advance, so as to obtain the information therein to determine the bit overhead of the second part, and then correctly decode the second part. Through the design, the network equipment can correctly decode the first part and the second part of the CSI report, and further obtain the CSI fed back by the terminal equipment. Because the CSI fed back by the terminal equipment is determined based on the downlink channel measurement, the CSI can be well adapted to the downlink channel, and therefore the network equipment is facilitated to determine the precoding matrix for data transmission adapted to the downlink channel. Thereby achieving the effect of improving the data transmission performance. In addition, the number of transmission layers is implicitly indicated through the one or more fields, and the RI field in the existing CSI report can be eliminated, thereby being beneficial to reducing the bit overhead of the first part of the CSI report.

Fig. 4 is a schematic flow chart diagram of a method 400 for indicating CSI provided in another embodiment of the present application. As shown, the method 400 may include steps 410 through 430. The steps in method 400 are described in detail below.

In step 410, the terminal device generates a CSI report.

Specifically, as previously described, the CSI report may include a first portion and a second portion. For reporting the frequency domain vectors, the first part may include at least one indication field whose bit overhead may be predetermined, so as to indicate a total number of frequency domain vectors reported by the terminal device for R transmission layers. The second portion may include the number of frequency domain vectors reported by the terminal device for each of the R transport layers and the frequency domain vectors reported for each transport layer.

In this case, the first part of the CSI report may also employ the RI field to indicate the number of transmission layers R.

It should be understood that the information contained in the first and second portions referred to above is only information related to the reporting of the frequency domain vector and does not represent the entire information contained in the first and second portions. For example, the first portion may also include CQI. For another example, the second part may further include indication information of a space-domain vector, quantization information of a space-frequency combining coefficient, and the like. This is not a limitation of the present application.

A specific method for indicating the total number of frequency domain vectors reported for R transport layers by an indication field in the first part, which can be predetermined by bit overhead, is described in detail below.

In one implementation, the indication field may pass through

One bit to indicate the total number of frequency domain vectors reported for the R transport layers.

Is directed to R₀R in transport layer₀And reporting the number of the frequency domain vectors preconfigured by each transmission layer.

In particular, R₀Is the number of assumed transmission layers, r corresponding to it₀Can be 1. ltoreq. r₀≤R₀. For R₀R in transport layer₀The reporting quantity of the frequency domain vectors preconfigured by each transmission layer is

That is, for the r-th₀The maximum number of frequency domain vectors that can be reported by each transmission layer is

Or, for the r-th₀The number of the frequency domain vectors reported by the terminal equipment can be provided by each transmission layer

And possible values. Then, the maximum number of frequency domain vectors that can be reported for R transport layers is

Or, there may be the number of frequency domain vectors reported by R transport layer terminal devices

And possible values.

Thus, passing through

The indication field of one bit may indicate the total number of frequency domain vectors reported for R transport layers. And, since the bit overhead of the field is independent of the actual number of transmission layers R, and is only related to the preconfigured maximum number of transmission layers and the number of reported frequency domain vectors configured for each transmission layer, the network device may determine the bit overhead of the indication field in advance.

Optionally, the second part of the CSI report comprises indication information indicating a number of frequency domain vectors reported for a space domain vector on each of the R transport layers. When the indication information is used for indicating the number of frequency domain vectors reported for the R-th transmission layer in the R transmission layers, the indication information specifically indicates the number of frequency domain vectors reported for each space domain vector on the R-th transmission layer

And

the difference value of (a) to (b),

is a positive integer.

After indicating the total number of frequency domain vectors reported for the R transport layers through the first portion, the terminal device may further indicate the number of frequency domain vectors reported for each transport layer through the second portion. Since the number of transmission layers R is indicated in the first part, the terminal device may indicate the number of frequency domain vectors reported for each transmission layer in the second part, for example, by R fields corresponding to the R layers, respectively. Taking the r-th transport layer as an example, the terminal device may carry, in the r-th field corresponding to the r-th transport layer, the number of frequency domain vectors used for indicating reporting. The r-th field may be filled with, for example, a binary value indicating the number of frequency domain vectors, or may be filled with an index or a flag corresponding to the number of frequency domain vectors.

The terminal device may also indicate the number of frequency domain vectors reported for each transmission layer in a differential manner.

Optionally, the second part of the CSI report comprises indication information indicating a number of frequency domain vectors reported for a space domain vector on each of the R transport layers. When the indication information is used for indicating the number of frequency domain vectors reported by an R-th transmission layer in R transmission layers, the indication information specifically indicates the number of frequency domain vectors reported by the R-th transmission layer

And

the difference value of (a) to (b),

is a positive integer.

That is, the r-th field corresponding to the r-th transport layer may refer toDisplay device

Value of or

The value of (c). Since the network device can know the reporting number of the frequency domain vectors preconfigured for the r-th transmission layer in advance, the number of the frequency domain vectors reported by the terminal device for the r-th transmission layer can be determined according to the reported difference.

Optionally, the second part of the CSI report is used to indicate a frequency domain vector reported for each transport layer.

When indicating the frequency domain vector reported for each transmission layer, the terminal device may indicate the frequency domain vector by using an index of each frequency domain vector, or may indicate the frequency domain vector by using an index of a combination of frequency domain vectors reported for each transmission layer, which is not limited in this application. The specific method for indicating the frequency domain vector by the terminal device can refer to the prior art. A detailed description of this particular process is omitted here for the sake of brevity.

In addition, the second part of the CSI report may also indicate the space vector reported for each transmission layer, the space-frequency combining coefficient reported for each transmission layer, and the position thereof. Since the present embodiment mainly relates to reporting of relevant information of a frequency domain vector, the prior art may be referred to for a specific reporting manner of other information. For the sake of brevity, this will not be described in detail here.

In another implementation, the indication field may pass

Is directed to R₀R in transport layer₀And reporting quantity of frequency domain vectors preconfigured by each space domain vector on each transmission layer.

At a hypothetical R₀In one transport layer, for the sameThe reporting quantity of the frequency domain vectors preconfigured by any two space domain vectors on the transmission layer is the same, and the quantity of the space domain vectors corresponding to any two transmission layers is the same. Then pass through

The bits may determine the total number of frequency domain vectors actually reported by the terminal device for the R transport layers.

Specifically, if the number of frequency domain vectors pre-configured for any two space domain vectors on the same transmission layer is the same, the number of frequency domain vectors reported for each transmission layer can be determined. For example, the number of space vectors reported for the r-th transport layer is L _rThe number of frequency domain vectors reported for the r-th transport layer may be

And possible values.

The number of the space domain vectors corresponding to any two transmission layers is the same, which may mean that the number of the space domain vectors reported for any two transmission layers is the same. Therefore, the number of space vectors reported for the R transport layers can be considered to be the same, e.g., L_rL. The number of frequency domain vectors reported for R transport layers may be

And possible values.

The reporting number of the transport layer R and the spatial vectors can be predetermined by the network equipment. For example, the RI field in the first part of the CSI report may indicate the transport layer R. The network equipment can pre-configure the reporting number of the space domain vectors, and the number of the space domain vectors actually reported by the terminal equipment is the same as the reporting number of the space domain vectors pre-configured by the network equipment. Alternatively, the first part of the CSI report may also indicate the number of space vectors reported by the terminal device.

Therefore, the terminal equipment can pass through

Each bit indicates the total number of frequency domain vectors actually reported for R transport layers.

for example, the number of reporting frequency domain vectors is M, so that it can be determined that the number of frequency domain vectors actually reported by the terminal device has R × M possible values

One bit to indicate the total number of frequency domain vectors actually reported for the R transport layers.

Still further, the protocol may predefine that the number of frequency domain vectors reported for any two transport layers is the same. In this case, the indication field only needs to determine the bit overhead by the number of reports of the preconfigured frequency domain vector. For example, the number of reported frequency domain vectors that are preconfigured is M, so that it can be determined that there are M possible values for the number of frequency domain vectors that are actually reported by the terminal device. Then also can pass

Optionally, the second part of the CSI report comprises indication information indicating a number of frequency domain vectors reported for a space domain vector on each of the R transport layers. When the indication information is used for indicating the number of frequency domain vectors reported for the R-th transmission layer in the R transmission layers, the indication information specifically indicates the number M of frequency domain vectors reported for each space domain vector on the R-th transmission layer^r,sAnd

difference of (D), M^r,sIs a positive integer.

That is, the r field corresponding to the r transport layerCan indicate

Value of or

The value of (c). Since the network device can know the reporting number of the frequency domain vectors preconfigured for each space domain vector on the r-th transmission layer in advance, the number of the frequency domain vectors reported by the terminal device for each space domain vector on the r-th transmission layer can be determined according to the reported difference.

Optionally, the second portion of the CSI report is used to indicate a frequency domain vector reported for each spatial domain vector on each transmission layer.

It should be understood that the two possible implementations listed above are only examples and should not constitute any limitation to the present application. The parameters in the above-listed embodiments may also be of the transport layer group granularity. For example, the indication field in the first portion may pass through

Bits to indicate the total number of frequency domain vectors reported for the R transport layers; alternatively, the indication field in the first portion may pass through

The number of bits indicates the total number of frequency domain vectors reported for R transport layers in the T transport layer groups. The specific method for indicating the total number of frequency domain vectors reported for R transport layers based on the granularity of the transport layer group is similar to the specific method described above, and for brevity, details are not repeated here.

In step 420, the terminal device sends a CSI report. Accordingly, the network device receives the CSI report.

The specific process of step 420 is the same as the specific process of step 420 in method 200 above. For brevity, no further description is provided herein.

In step 430, the network device determines precoding vectors corresponding to the frequency domain elements on each transmission layer according to the CSI report.

Specifically, the network device may first determine the number of frequency domain vectors reported for the R transport layers according to the first part of the CSI report.

The specific procedure that the terminal device indicates the total number of frequency domain vectors reported for R transmission layers through the CSI report has been described in detail in step 410 above. The specific process of the network device determining the total number of frequency domain vectors reported for the R transport layers according to the first part is similar to that of the first part, and a detailed description of the specific process is omitted here for the sake of brevity.

Thereafter, the network device may determine, according to the total number of frequency domain vectors reported for the R transmission layers determined by the first part, an indication overhead for indicating related information of the frequency domain vectors in the second part of the CSI report, and further determine a length of the second part of the CSI report, and decode the second part.

Based on the above technical scheme, the terminal device may indicate the total number of frequency domain vectors reported for the R transmission layers through the first part of the CSI report. By designing an indication field capable of determining bit overhead in advance for the first part, the network device can decode the first part according to the bit overhead determined in advance, so as to obtain information therein to determine the bit overhead of the second part, and thus, the second part can be correctly decoded. Through the design, the network equipment can correctly decode the first part and the second part of the CSI report, and further obtain the CSI fed back by the terminal equipment. Because the CSI fed back by the terminal equipment is determined based on the downlink channel measurement, the CSI can be well adapted to the downlink channel, and therefore the network equipment is facilitated to determine the precoding matrix for data transmission adapted to the downlink channel. Thereby achieving the effect of improving the data transmission performance. Furthermore, by indicating the total number of frequency domain vectors reported for the R transport layers by the indication field, the bit overhead of the CSI reporting first part may be reduced compared to reporting the number of frequency domain vectors by a plurality of fields corresponding to a plurality of layers.

It should be understood that, in the foregoing embodiments, the sequence numbers of the processes do not imply an execution sequence, and the execution sequence of the processes should be determined by functions and internal logic of the processes, and should not constitute any limitation to the implementation process of the embodiments of the present application.

The method provided by the embodiment of the present application is described in detail above with reference to fig. 2 to 4. Hereinafter, the apparatus provided in the embodiment of the present application will be described in detail with reference to fig. 5 to 6.

Fig. 5 is a schematic block diagram of a communication device provided in an embodiment of the present application. As shown in fig. 5, the communication device 1000 may include a processing unit 1100 and a transceiving unit 1200.

In one possible design, the communication apparatus 1000 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. When the communication device is a chip configured in a terminal apparatus, the chip may be one or more. The one or more chips may be used to implement the functionality of the terminal device in the above embodiments.

Specifically, the communication apparatus 1000 may correspond to a terminal device in the method 200, the method 300, or the method 400 according to an embodiment of the present application, and the communication apparatus 1000 may include a unit for performing the method performed by the terminal device in the method 200 in fig. 2, the method 300 in fig. 3, or the method 400 in fig. 4. Also, the units and other operations and/or functions described above in the communication device 1000 are respectively for implementing the corresponding flows of the method 200 in fig. 2, the method 300 in fig. 3, or the method 400 in fig. 4.

When the communication device 1000 is used to execute the method 200 in fig. 2, the processing unit 1100 may be used to execute the step 220 in the method 200, and the transceiver 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, detailed descriptions thereof are omitted.

When the communication device 1000 is used to execute the method 300 in fig. 3, the processing unit 1100 may be used to execute the step 320 in the method 300, and the transceiver unit 1200 may be used to execute the step 310 in 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, detailed descriptions thereof are omitted.

When the communication device 1000 is configured to perform the method 400 in fig. 4, the processing unit 1100 may be configured to perform step 420 in the method 400, and the transceiver unit 1200 may be configured to perform step 410 in 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, detailed descriptions thereof are omitted.

It is further understood that when the communication apparatus 1000 is a terminal device, the processing unit 1100 in the communication apparatus 1000 may correspond to the processor 2010 in the terminal device 2000 shown in fig. 6, and the transceiver unit 1200 in the communication apparatus 1000 may correspond to the transceiver 2020 in the terminal device 2000 shown in fig. 6.

It should also be understood that when the communication device 1000 is a chip configured in a terminal device, the transceiver unit 1200 in the communication device 1000 may be an input/output interface.

In another possible design, the communication apparatus 1000 may correspond to the network device in the above method embodiment, and may be, for example, a network device or a chip configured in a network device. When the communication device is a chip configured in a terminal apparatus, the chip may be one or more. The one or more chips may be used to implement the functionality of the terminal device in the above embodiments.

Specifically, the communication apparatus 1000 may correspond to the network device in the method 200, the method 300, or the method 400 according to the embodiment of the present application, and the communication apparatus 1000 may include a unit for performing the method performed by the network device in the method 200 in fig. 2, the method 300 in fig. 3, or the method 400 in fig. 4. Also, the units and other operations and/or functions described above in the communication device 1000 are respectively for implementing the corresponding flows of the method 200 in fig. 2, the method 300 in fig. 3, or the method 400 in fig. 4.

When the communication device 1000 is used to execute the method 200 in fig. 2, the processing unit 1100 may be used to execute step 220 in the method 200, and the transceiver unit 1200 may be used to execute step 230 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, detailed descriptions thereof are omitted.

When the communication device 1000 is used to execute the method 300 in fig. 3, the processing unit 1100 may be used to execute the step 320 in the method 300, and the transceiver unit 1200 may be used to execute the step 330 in 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, detailed descriptions thereof are omitted.

When the communication device 1000 is configured to perform the method 400 in fig. 4, the processing unit 1100 may be configured to perform step 420 in the method 400, and the transceiver unit 1200 may be configured to perform step 430 in 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, detailed descriptions thereof are omitted.

It should also be understood that when the communication apparatus 1000 is a network device, the transceiving unit in the communication apparatus 1000 may correspond to the transceiver 3200 in the network device 3000 shown in fig. 7, and the processing unit 1100 in the communication apparatus 1000 may correspond to the processor 3100 in the network device 3000 shown in fig. 7.

It should also be understood that when the communication device 1000 is a chip configured in a network device, the transceiver unit 1200 in the communication device 1000 may be an input/output interface.

Fig. 6 is a schematic structural diagram of a terminal device 2000 according to an embodiment of the present application. The terminal device 2000 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 2000 includes a processor 2010 and a transceiver 2020. Optionally, the terminal device 2000 further comprises a memory 2030. The processor 2010, the transceiver 2002 and the memory 2030 may be in communication with each other via the interconnection path to transfer control and/or data signals, the memory 2030 may be used for storing a computer program, and the processor 2010 may be used for retrieving and executing the computer program from the memory 2030 to control the transceiver 2020 to transmit and receive signals. Optionally, the terminal device 2000 may further include an antenna 2040, configured to transmit uplink data or uplink control signaling output by the transceiver 2020 by using a wireless signal.

The processor 2010 and the memory 2030 may be combined into a processing device, and the processor 2010 is configured to execute the program codes stored in the memory 2030 to achieve the above functions. In particular, the memory 2030 may be integrated with the processor 2010 or may be separate from the processor 2010. The processor 2010 may correspond to the processing unit in fig. 5.

The transceiver 2020 may correspond to the transceiver unit in fig. 5, and may also be referred to as a transceiver unit. The transceiver 2020 may include a receiver (or receiver, receiving circuit) and a transmitter (or transmitter, transmitting circuit). Wherein the receiver is used for receiving signals, and the transmitter is used for transmitting signals.

It should be understood that terminal device 2000 shown in fig. 6 is capable of implementing various processes involving the terminal device in the method embodiments shown in fig. 2, 3, or 4. The operations and/or functions of the units in the terminal device 2000 are respectively to implement 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 2010 may be configured to perform the actions described in the preceding method embodiments that are implemented within the terminal device, and the transceiver 2020 may be configured to perform the actions described in the preceding 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 2000 may further include a power supply 2050 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 2000 may further include one or more of an input unit 2060, a display unit 2070, an audio circuit 2080, a camera 2090, a sensor 2100, and the like, and the audio circuit may further include a speaker 2082, a microphone 2084, and the like.

Fig. 7 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 3000 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 3000 may include one or more radio frequency units, such as a Remote Radio Unit (RRU) 3100 and one or more baseband units (BBUs) (which may also be referred to as Distributed Units (DUs)) 3200. The RRU 3100 may be referred to as a transceiver unit, and corresponds to the transceiver unit 1100 in fig. 5. Alternatively, the transceiving unit 3100 may also be referred to as a transceiver, transceiving circuit, or transceiver, etc., which may comprise at least one antenna 3101 and a radio frequency unit 3102. Alternatively, the transceiving unit 3100 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 RRU 3100 part is mainly used for transceiving and converting radio frequency signals to baseband signals, for example, for sending indication information to a terminal device. The BBU 3200 section is mainly used for performing baseband processing, controlling a base station, and the like. The RRU 3100 and the BBU 3200 may be physically disposed together or may be physically disposed separately, i.e. distributed base stations.

The BBU 3200 is a control center of the base station, and may also be referred to as a processing unit, and may correspond to the processing unit 1200 in fig. 5, and is mainly used for completing baseband processing functions, such as channel coding, multiplexing, modulating, 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 BBU 3200 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 3201 and a processor 3202. The memory 3201 is used to store necessary instructions and data. The processor 3202 is used for controlling the base station to perform necessary actions, for example, for controlling the base station to execute the operation flow related to the network device in the above method embodiment. The memory 3201 and processor 3202 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 3000 shown in fig. 7 is capable of implementing various processes involving network devices in the method embodiments shown in fig. 2, 3 or 4. The operations and/or functions of the respective units in the base station 3000 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.

BBU 3200 as described above can be used to perform actions described in previous method embodiments as being implemented internally by a network device, while RRU 3100 can be used to perform actions described in previous method embodiments as being sent by or received from a terminal device by a network device. Please refer to the description of the previous embodiment of the method, which is not repeated herein.

It should be understood that the base station 3000 shown in fig. 7 is only one possible architecture of a network device, and should not constitute any limitation to the present application. The method provided by the application can be applied to network equipment with other architectures. Such as Active Antenna Unit (AAU), CU + DU, etc. The present application is not limited to the specific architecture of the network device.

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 any of the above method embodiments.

It is to be understood that the processing means described above may be one or more chips. 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 Microcontroller (MCU), a programmable logic controller (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 elements in a processor. The software elements may be located in ram, flash, rom, prom, or eprom, registers, among other storage media that are 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 integrated logic circuits of hardware in a processor or instructions in the form of software. 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 various 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 elements in the decoding processor. The software elements may be located in ram, flash, rom, prom, or eprom, registers, among other storage media that are 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 in the embodiment shown in fig. 2, 3 or 4.

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 the embodiment shown in fig. 2, 3 or 4, according to the method provided by the embodiment 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.

The network device in the foregoing device embodiments completely corresponds to the network device or the terminal device in the terminal device and method embodiments, and the corresponding unit or unit performs the corresponding steps, for example, the transceiver unit (transceiver) performs the step of receiving or transmitting in the method embodiments, and other steps besides transmitting and receiving may be performed by the 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," "unit," "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 shall 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 comprising at least a first portion comprising at least R₀Individual field, R₀A predefined maximum number of transmission layers; the R is₀The field is used for indicating the number of frequency domain vectors reported aiming at each transmission layer in the R transmission layers; the precoding vector of each frequency domain unit on the R transmission layer is constructed according to the frequency domain vector reported by the R transmission layer in the R transmission layers; r₀R is more than or equal to 1, R is more than or equal to 1 and less than or equal to R, and R₀R and R are integers;

and sending the CSI report.

2. A method of channel state information, CSI, comprising:

receiving a CSI report, the CSI report comprising at least a first portion comprising at least R₀Individual field, R₀A predefined maximum number of transmission layers; the R is₀The field is used for indicating the number of frequency domain vectors reported aiming at each transmission layer in the R transmission layers; the precoding vector of each frequency domain unit on the R transmission layer is constructed according to the frequency domain vector reported by the R transmission layer in the R transmission layers; r₀R is more than or equal to 1, R is more than or equal to 1 and less than or equal to R, and R₀R and R are integers;

Determining the number of transmission layers R and the number of frequency domain vectors reported for each of the R transmission layers according to the first part of the CSI report.

3. A communications apparatus, comprising:

a processing unit to generate a CSI report, the CSI report including at least a first portion including at least R₀Individual field, R₀A predefined maximum number of transmission layers; the R is₀The field is used for indicating the number of frequency domain vectors reported aiming at each transmission layer in the R transmission layers; the precoding vector of each frequency domain unit on the R transmission layer is constructed according to the frequency domain vector reported by the R transmission layer in the R transmission layers; r₀R is more than or equal to 1, R is more than or equal to 1 and less than or equal to R, and R₀R and R are integers;

and the transceiving unit is used for sending the CSI report.

4. A communications apparatus, comprising:

a transceiver unit for receiving a CSI report, the CSI report comprising at least a first part, the first part comprising at least R₀Individual field, R₀A predefined maximum number of transmission layers; the R is₀The field is used for indicating the number of frequency domain vectors reported aiming at each transmission layer in the R transmission layers; the frequency domain vector reported by the R transport layer of the R transport layers is used for constructing each frequency domain on the R transport layer A precoding vector of a cell; r₀R is more than or equal to 1, R is more than or equal to 1 and less than or equal to R, and R₀R and R are integers;

a processing unit, configured to determine, according to the first part of the CSI report, the number R of transmission layers and the number of frequency domain vectors reported for each of the R transmission layers.

5. The method of claim 1 or 2, or the apparatus of claim 3 or 4, wherein R is₀Each field and R₀The transmission layers correspond to each other; the R is₀Each field of R fields in the fields is used for indicating the number of frequency domain vectors reported aiming at one transmission layer; the R is₀Remaining R in the individual field₀-R fields are predefined values representing that no frequency domain vector is reported for the corresponding transport layer; the R is₀The number field is used for implicitly indicating the number of transmission layers R.

6. The method of claim 1, 2 or 5, or the apparatus of claim 3, 4 or 5, wherein R is₀R in the individual field₀Overhead of a field is

The number of bits is one,

is shown for R₀R in transport layer₀The number of the selectable values of the number of the frequency domain vectors reported by each space domain vector on each transmission layer is r which is more than or equal to 1₀≤R₀And r is₀Is an integer which is the number of the whole,

Is a positive integer; in said R₀In each transmission layer, the reporting quantity of frequency domain vectors pre-configured for any two space domain vectors on the same transmission layer is the same; wherein, the space vector corresponding to the R-th transmission layer in the R transmission layersAnd the frequency domain vector reported by aiming at each space domain vector on the r transmission layer is used for constructing the precoding vector of each frequency domain unit on the r transmission layer.

7. The method or apparatus of claim 6, wherein R is₀R in the individual field₀Each field has

A selectable value, said

8. A method or apparatus according to claim 6 or 7,

has a value of

is a positive integer.

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

generating a CSI report comprising at least a first portion comprising at least T ₀+1 fields, T₀Is a predefined maximum number of transport layer groups; the T is₀The +1 field is used for indicating the number of frequency domain vectors reported for each of the R transmission layers; the R transport layers belong to T transport layer groups, each transport layer group comprising one or more of the R transport layers; the precoding vector of each frequency domain unit on the R transmission layer is constructed according to the frequency domain vector reported by the R transmission layer in the R transmission layers; t is₀More than or equal to T, R is more than or equal to T, R is more than or equal to 1 and less than or equal to R, and T₀T, R and r are all positive integers;

and sending the CSI report.

10. 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 at least T₀+1 fields, T₀Is a predefined maximum number of transport layer groups; the T is₀The +1 field is used for indicating the number of frequency domain vectors reported for each of the R transmission layers; the R transport layers belong to T transport layer groups, each transport layer group comprising one or more of the R transport layers; the precoding vector of each frequency domain unit on the R transmission layer is constructed according to the frequency domain vector reported by the R transmission layer in the R transmission layers; t is ₀More than or equal to T, R is more than or equal to T, R is more than or equal to 1 and less than or equal to R, and T₀T, R and r are all positive integers;

11. A communications apparatus, comprising:

a processing unit to generate a CSI report, the CSI report including a first part including at least T₀+1 fields, T₀Is a predefined maximum number of transport layer groups; the T is₀The +1 field is used for indicating the number of frequency domain vectors reported for each of the R transmission layers; the R transport layers belong to T transport layer groups, each transport layer group comprising one or more of the R transport layers; the precoding vector of each frequency domain unit on the R transmission layer is constructed according to the frequency domain vector reported by the R transmission layer in the R transmission layers; t is₀More than or equal to T, R is more than or equal to T, R is more than or equal to 1 and less than or equal to R, and T₀T, R and r are all positive integers;

and the transceiving unit is used for sending the CSI report.

12. A communications apparatus, comprising:

a transceiver unit for receiving a CSI report, the CSI report comprising a first part comprising at least T ₀+1 fields, T₀Is a predefined maximum number of transport layer groups; the T is₀The +1 field is used for indicating the number of frequency domain vectors reported for each of the R transmission layers; the R transport layers belong to T transport layer groups, each transport layer group comprising one or more of the R transport layers; the precoding vector of each frequency domain unit on the R transmission layer is constructed according to the frequency domain vector reported by the R transmission layer in the R transmission layers; t is₀More than or equal to T, R is more than or equal to T, R is more than or equal to 1 and less than or equal to R, and T₀T, R and r are all positive integers;

13. The method of claim 9 or 10, or the apparatus of claim 11 or 12, wherein T is₀+1 field comprising and T₀T corresponding to transmission layer group₀A field and an indication field; the T is₀T fields of the number of fields are used to indicate for each of the T groups of transmission layersThe number of frequency domain vectors reported by each transmission layer; the T is₀The rest of T in each field₀-T fields are predefined values representing that no frequency domain vector is reported for the corresponding transmission layer group; the indication field is used for indicating the number of transmission layers of the frequency domain vector reported by aiming at the T transmission layer group in the T transmission layer groups; the T is ₀The +1 field is used to implicitly indicate the number of transmission layers R.

14. The method or apparatus of claim 13, wherein the T is₀T-th in the individual field₀Overhead of a field is

The number of bits is one,

15. The method or apparatus of claim 14, wherein the T is₀T-th in the individual field₀Each field has

A selectable value, said

16. The method or apparatus of claim 14 or 15,

is taken as

is a positive integer.

17. The method or apparatus of any of claims 13 to 16, wherein the overhead of the indication field is

Bit, S for T₀A maximum number of transmission layers pre-configured for a group of transmission layers, the maximum number of transmission layers representing the number of transmission layers for the T₀And the maximum value of the transmission layer numbers pre-configured by each transmission layer group in the transmission layer groups, wherein S is a positive integer.

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

generating a CSI report, wherein the CSI report at least comprises a first part, and the first part comprises an index value which is used for indicating the number of frequency domain vectors and the number R of transmission layers reported respectively for each of R transmission layers; the index value is taken from a plurality of index values which are pre-configured, the index values correspond to a plurality of parameter groups, and each parameter group comprises one transmission layer number and a frequency domain vector reporting number which is pre-configured aiming at each transmission layer; the precoding vector of each frequency domain unit on the R transmission layer is constructed by aiming at the frequency domain vector reported by the R transmission layer in the R transmission layers, wherein R is more than or equal to 1 and less than or equal to R, and R and R are both positive integers;

And sending the CSI report.

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

receiving a CSI report, wherein the CSI report at least comprises a first part, and the first part comprises an index value which is used for indicating the number R of transmission layers and the number of frequency domain vectors reported by each of the R transmission layers; the index value is taken from a plurality of index values which are pre-configured, the index values correspond to a plurality of parameter groups, and each parameter group comprises one transmission layer number and a frequency domain vector reporting number which is pre-configured aiming at each transmission layer; the precoding vector of each frequency domain unit on the R transmission layer is constructed by aiming at the frequency domain vector reported by the R transmission layer in the R transmission layers, wherein R is more than or equal to 1 and less than or equal to R, and R and R are both positive integers;

and determining the number of transmission layers R and the number of frequency domain vectors reported for each of the R transmission layers according to the first part of the CSI report.

20. A communications apparatus, comprising:

a processing unit, configured to generate a CSI report, where the CSI report at least includes a first part, and the first part includes an index value, and the index value is used to indicate, for each transmission layer of R transmission layers, the number of frequency domain vectors and the number R of transmission layers that are respectively reported; the index value is taken from a plurality of index values which are pre-configured, the index values correspond to a plurality of parameter groups, and each parameter group comprises one transmission layer number and a frequency domain vector reporting number which is pre-configured aiming at each transmission layer; the precoding vector of each frequency domain unit on the R transmission layer is constructed by aiming at the frequency domain vector reported by the R transmission layer in the R transmission layers, wherein R is more than or equal to 1 and less than or equal to R, and R and R are both positive integers;

And the transceiving unit is used for sending the CSI report.

21. A communications apparatus, comprising:

a transceiver unit, configured to receive a CSI report, where the CSI report at least includes a first part, and the first part includes an index value, and the index value is used to indicate the number of transmission layers R and the number of frequency domain vectors reported by each of R transmission layers; the index value is taken from a plurality of index values which are pre-configured, the index values correspond to a plurality of parameter groups, and each parameter group comprises one transmission layer number and a frequency domain vector reporting number which is pre-configured aiming at each transmission layer; the precoding vector of each frequency domain unit on the R transmission layer is constructed by aiming at the frequency domain vector reported by the R transmission layer in the R transmission layers, wherein R is more than or equal to 1 and less than or equal to R, and R and R are both positive integers;

22. The method of claim 18 or 19, or the apparatus of claim 20 or 21, wherein the bit overhead of the indication field is the same as for R ₀The reported number of frequency domain vectors preconfigured per space domain vector on each transport layer in a transport layer is related, R₀For a predefined maximum number of transmission layers, R₀Is a positive integer.

23. The method of any one of claims 18, 19 or 22, or the apparatus of any one of claims 20 to 22, wherein the overhead of the index value is

A bit; wherein R is₀For a predefined maximum number of transmission layers,

24. The method of any one of claims 18, 19, 22 or 23, or the apparatus of any one of claims 20 to 23, wherein the number of the plurality of parameter sets is less than or equal to

Wherein R is₀For a predefined maximum number of transmission layers,

is shown for R₀Reporting quantity of frequency domain vectors pre-configured by space domain vectors on the ith transmission layer in the transmission layers; the reporting quantity of the frequency domain vectors pre-configured for any two space domain vectors on the same transmission layer is the same; i is more than or equal to 1 and less than or equal to r ₀，1≤r₀≤R₀And i, r₀And R₀Are integers.

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

generating a CSI report, wherein the CSI report at least comprises a first part, and the first part at least comprises an indication field, and the indication field indicates the total number of frequency domain vectors reported for R transmission layers; the frequency domain vector reported by the R transmission layer in the R transmission layers is used for determining the precoding vector of each frequency domain unit on the R transmission layer; r is more than or equal to 1, R is more than or equal to 1 and less than or equal to R, and R and R are integers;

and sending the CSI report.

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

receiving a CSI report, wherein the CSI report at least comprises a first part and the first part at least comprises an indication field, and the indication field indicates the total number of frequency domain vectors reported for R transmission layers; the frequency domain vector reported by the R transmission layer in the R transmission layers is used for determining the precoding vector of each frequency domain unit on the R transmission layer; r is more than or equal to 1, R is more than or equal to 1 and less than or equal to R, and R and R are integers;

determining a total number of frequency domain vectors reported for the R transport layers from the first portion of the CSI report.

27. A communications apparatus, comprising:

a processing unit, configured to generate a CSI report, where the CSI report includes at least a first portion, and the first portion includes at least an indication field, and the indication field indicates a total number of frequency domain vectors reported for R transmission layers; the frequency domain vector reported by the R transmission layer in the R transmission layers is used for determining the precoding vector of each frequency domain unit on the R transmission layer; r is more than or equal to 1, R is more than or equal to 1 and less than or equal to R, and R and R are integers;

and the transceiving unit is used for sending the CSI report.

28. A communications apparatus, comprising:

a transceiver unit, configured to receive a CSI report, where the CSI report at least includes a first part, and the first part at least includes an indication field, and the indication field indicates a total number of frequency domain vectors reported for R transmission layers; the frequency domain vector reported by the R transmission layer in the R transmission layers is used for determining the precoding vector of each frequency domain unit on the R transmission layer; r is more than or equal to 1, R is more than or equal to 1 and less than or equal to R, and R and R are integers;

a processing unit, configured to determine, according to the first part of the CSI report, a total number of frequency domain vectors reported for the R transport layers.

29. The method according to claim 25 or 26, or the apparatus according to claim 27 or 28, wherein the overhead of the indication field is

The number of bits is one,

is shown for R₀R in transport layer₀Reporting quantity of frequency domain vectors R pre-configured for each space domain vector on each transmission layer₀R is more than or equal to 1 and is the predefined maximum transmission layer number₀≤R₀，R₀、r₀And

are all integers; in said R₀In each transmission layer, the number of the frequency domain vectors pre-configured for any two space domain vectors on the same transmission layer is the same, and the number of the space domain vectors corresponding to any two transmission layers is the same; the space vector corresponding to the R-th transmission layer of the R transmission layers and the frequency domain vector reported for each space vector on the R-th transmission layer are used for constructing the precoding vector of each frequency domain unit on the R-th transmission layer.

30. The method of any one of claims 25, 26, or 29, or the apparatus of any one of claims 27-29, wherein the CSI report further comprises a second portion comprising an indication of a number of frequency domain vectors reported for each spatial domain vector on each of the R transport layers.

31. The method or apparatus of claim 30, wherein for an R-th transmission layer of the R transmission layers, the indication information specifically indicates a number of frequency domain vectors Mr and a number of spatial domain vectors reported for each spatial domain vector on the R-th transmission layer

Difference of (D), M^rIs a positive integer.

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

generating a CSI report comprising at least a first portion comprising at least R₀Individual field, R₀A predefined maximum number of transmission layers; the R is₀The field is used for indicating the number of the space-frequency merging coefficients reported aiming at each transmission layer in the R transmission layers; the space-frequency combining coefficients reported by the R transmission layer of the R transmission layers correspond to the space-frequency vector pairs reported by the R transmission layer one by one, so as to construct precoding vectors of each frequency domain unit on the R transmission layer; r₀R is more than or equal to 1, R is more than or equal to 1 and less than or equal to R, and R₀R and R are integers;

and sending the CSI report.

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

receiving a CSI report, the CSI report comprising at least a first portion comprising at least R ₀Individual field, R₀A predefined maximum number of transmission layers; the R is₀The field is used for indicating the number of the space-frequency merging coefficients reported aiming at each transmission layer in the R transmission layers; the space-frequency merging coefficients reported by the R transport layer in the R transport layers and the space-frequency vector pairs reported by the R transport layer are paired one by oneCorrespondingly, the precoding vectors are used for constructing the precoding vectors of the frequency domain units on the r transmission layer; r₀R is more than or equal to 1, R is more than or equal to 1 and less than or equal to R, and R₀R and R are integers;

and determining the number of transmission layers R and the number of space-frequency combining coefficients reported for each of the R transmission layers according to the first part of the CSI report.

34. A communications apparatus, comprising:

a processing unit to generate a CSI report, the CSI report including at least a first portion including at least R₀Individual field, R₀A predefined maximum number of transmission layers; the R is₀The field is used for indicating the number of the space-frequency merging coefficients reported aiming at each transmission layer in the R transmission layers; the space-frequency combining coefficients reported by the R transmission layer of the R transmission layers correspond to the space-frequency vector pairs reported by the R transmission layer one by one, so as to construct precoding vectors of each frequency domain unit on the R transmission layer; r ₀R is more than or equal to 1, R is more than or equal to 1 and less than or equal to R, and R₀R and R are integers;

a transceiver unit, configured to send the CSI report.

35. A communications apparatus, comprising:

a transceiver unit for receiving a CSI report, the CSI report comprising at least a first part, the first part comprising at least R₀Individual field, R₀A predefined maximum number of transmission layers; the R is₀The field is used for indicating the number of the space-frequency merging coefficients reported aiming at each transmission layer in the R transmission layers; the space-frequency combining coefficients reported by the R transmission layer of the R transmission layers correspond to the space-frequency vector pairs reported by the R transmission layer one by one, so as to construct precoding vectors of each frequency domain unit on the R transmission layer; r₀R is more than or equal to 1, R is more than or equal to 1 and less than or equal to R, and R₀R and R are integers;

a processing unit, configured to determine, according to the first part of the CSI report, the number R of the transmission layers and the number of space-frequency combining coefficients reported for each of the R transmission layers.

36. The method of claim 32 or 33, or the apparatus of claim 34 or 35, wherein R is₀Each field and R₀The transmission layers correspond to each other; the R is₀Each field of R fields in the fields is used for indicating the number of frequency domain vectors reported aiming at one transmission layer; the R is ₀Remaining R in the individual field₀-R fields are predefined values representing that no frequency domain vector is reported for the corresponding transport layer; the R is₀The number field is used for implicitly indicating the number of transmission layers R.

37. The method of any one of claims 32, 33 or 36, or the apparatus of any one of claims 34 to 36, wherein R is₀R in the individual field₀Overhead of a field is

The number of bits is one,

is a positive integer.

38. The method or apparatus of claim 37, wherein R is₀R in the individual field₀Each field has

A selectable value, said

39. The method or apparatus of claim 37 or 38,

has a value of

Is a positive integer.

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

generating a CSI report comprising at least a first portion comprising at least T₀+1 fields, T₀Is a predefined maximum number of transport layer groups; the T is₀The +1 field is used for indicating the number of space-frequency merging coefficients reported aiming at each transmission layer in the R transmission layers; the R transport layers belong to T transport layer groups, each transport layer group comprising one or more of the R transport layers; the T transport layer groups include R transport layers for an R-th one of the R transport layersThe space-frequency merging coefficients reported by the transmission layer correspond to the space-frequency vector pairs reported by the r-th transmission layer one by one so as to construct precoding vectors of each frequency domain unit on the r-th transmission layer; t is₀More than or equal to T, R is more than or equal to T, R is more than or equal to 1 and less than or equal to R, and T₀T, R and r are all positive integers;

and sending the CSI report.

41. 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 at least T₀+1 fields, T₀Is a predefined maximum number of transport layer groups; the T is ₀The +1 field is used for indicating the number of space-frequency merging coefficients reported aiming at each transmission layer in the R transmission layers; the R transport layers belong to T transport layer groups, each transport layer group comprising one or more of the R transport layers; the T transmission layer groups comprise R transmission layers, and space-frequency merging coefficients reported by an R-th transmission layer in the R transmission layers correspond to space-frequency vector pairs reported by the R-th transmission layer one by one so as to construct precoding vectors of each frequency domain unit on the R-th transmission layer; t is₀More than or equal to T, R is more than or equal to T, R is more than or equal to 1 and less than or equal to R, and T₀T, R and r are all positive integers;

42. A communications apparatus, comprising:

a processing unit for generating a channel State information, CSI, report, the CSI report comprising at least a first part, the first part comprising at least T₀+1 fields, T₀Is a predefined maximum number of transport layer groups; the T is₀The +1 field is used for indicating the number of space-frequency merging coefficients reported aiming at each transmission layer in the R transmission layers; the R transmission layers belong to T transmission layer groups, and each transmission layer group comprises the R transmissions One or more transport layers of the layers; the T transmission layer groups comprise R transmission layers, and space-frequency merging coefficients reported by an R-th transmission layer in the R transmission layers correspond to space-frequency vector pairs reported by the R-th transmission layer one by one so as to construct precoding vectors of each frequency domain unit on the R-th transmission layer; t is₀More than or equal to T, R is more than or equal to T, R is more than or equal to 1 and less than or equal to R, and T₀T, R and r are all positive integers;

and the transceiving unit is used for sending the CSI report.

43. A communications apparatus, comprising:

a transceiver unit for receiving a CSI report, the CSI report comprising at least a first part, the first part comprising at least T₀+1 fields, T₀Is a predefined maximum number of transport layer groups; the T is₀The +1 field is used for indicating the number of space-frequency merging coefficients reported aiming at each transmission layer in the R transmission layers; the R transport layers belong to T transport layer groups, each transport layer group comprising one or more of the R transport layers; the T transmission layer groups comprise R transmission layers, and space-frequency merging coefficients reported by an R-th transmission layer in the R transmission layers correspond to space-frequency vector pairs reported by the R-th transmission layer one by one so as to construct precoding vectors of each frequency domain unit on the R-th transmission layer; t is ₀More than or equal to T, R is more than or equal to T, R is more than or equal to 1 and less than or equal to R, and T₀T, R and r are all positive integers;

44. The method of claim 40 or 41, or the apparatus of claim 42 or 43, wherein T is₀+1 field comprising and T₀T corresponding to transmission layer group₀A field and an indication field; the T is₀T fields of the plurality of fields are used to indicate for each transmission in each of the T groups of transmission layersThe number of space-frequency combining coefficients reported by the layer; the T is₀The rest of T in each field₀-T fields are predefined values indicating that no space-frequency combining coefficients are reported for the corresponding group of transmission layers; the indication field is used for indicating the number of transmission layers of which the space-frequency merging coefficients are reported aiming at the T transmission layer group in the T transmission layer groups; the T is₀The +1 field is used to implicitly indicate the number of transmission layers R.

45. The method or apparatus of claim 44, wherein the T is₀T-th in the individual field₀Overhead of a field is

The number of bits is one,

is a positive integer.

46. The method or apparatus of claim 45, wherein the T is₀T-th in the individual field₀Each field has a kind

Optionally a value, said

Seed value and for indicating the value for the t₀The transmission layer group does not report 1 value of the space-frequency merging coefficient.

47. The method or apparatus of claim 45 or 46,

has a value of

Represents for said T₀T of a group of transmission layers₀The sum of the reported numbers of the space-frequency merging coefficients pre-configured by one or more transmission layers in a plurality of transmission layer groups,

is a positive integer.

48. The method or apparatus of any of claims 44 to 47, wherein the overhead of the indication field is

A bit; s is for T₀A maximum number of transmission layers pre-configured for a group of transmission layers, the maximum number of transmission layers representing the number of transmission layers for the T₀And the maximum value of the transmission layer numbers pre-configured by each transmission layer group in the transmission layer groups, wherein S is a positive integer.

49. A communications apparatus comprising at least one processor configured to perform the method of any one of claims 1, 2, 5-10, 13-19, 22-26, 29-33, 36-41, and 44-48.

50. 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 10, 13 to 19, 22 to 26, 29 to 33, 36 to 41 and 44 to 48.