CN112312464B

CN112312464B - Method for reporting channel state information and communication device

Info

Publication number: CN112312464B
Application number: CN201910702965.8A
Authority: CN
Inventors: 王潇涵; 金黄平; 毕晓艳
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-07-31
Filing date: 2019-07-31
Publication date: 2023-12-29
Anticipated expiration: 2039-07-31
Also published as: CN112312464A

Abstract

The application provides a method and a communication device for reporting CSI. The terminal equipment generates and sends first indication information to the network equipment, wherein the first indication information is used for indicating M frequency domain vectors to be reported so as to construct a precoding matrix. The precoding matrix includes Z columns, and the Z-th column is constructed based on a frequency domain vector corresponding to the Z-th column from M frequency domain vectors, and the frequency domain vector corresponding to the Z-th column is determined from an initial frequency domain vector corresponding to the Z-th column. The initial frequency domain vectors for each column may be divided into one or more groups, each group corresponding to a group priority, and the initial frequency domain vector for each column corresponding to a column priority. The M frequency domain vectors are determined from the initial frequency domain vectors based on the group priorities and the column priorities. Therefore, the indication overhead can be reduced, and the limited uplink resources are fully utilized to transmit useful information so as to obtain higher feedback precision.

Description

Method for reporting channel state information and communication device

Technical Field

The present application relates to the field of communications, and more particularly, to a method and a communication device for reporting channel state information.

Background

In large-scale multiple-input multiple-input multiple output (Massive MIMO) technology, a network device may reduce interference between multiple users and interference between multiple signal streams of the same user through a precoding technology. Thereby improving the signal quality, realizing space division multiplexing and improving the frequency spectrum utilization rate.

The terminal device may determine, for example, by means of channel measurement, a precoding vector adapted to the downlink channel, and wish to make, by feedback, the network device obtain, with the same or similar precoding vector as the precoding vector determined by the terminal device. In order to reduce feedback overhead and improve feedback accuracy, in one implementation, the terminal device may indicate the precoding vector to the network device through a feedback manner combining spatial domain compression and frequency domain compression. Specifically, the terminal device may fit the precoding vector based on the precoding vector of each frequency domain unit on each transmission layer by weighting at least one spatial vector and at least one frequency domain vector. The terminal device may feed back the selected spatial vector, the frequency domain vector and the corresponding weighting coefficient to the network device, so that the network device recovers the precoding vector corresponding to each frequency domain unit on each transmission layer by the weighted sum of the matrix constructed by the spatial vector and the frequency domain vector.

However, in some cases, the terminal device may not be allocated enough uplink resources to report channel state information (channel state information, CSI). In this case, how to fully utilize limited physical uplink resources to report CSI so as to obtain higher compromise efficiency between feedback overhead and feedback accuracy becomes a technical problem to be solved urgently.

Disclosure of Invention

The application provides a method and a communication device for reporting CSI, which are used for obtaining higher compromise efficiency between feedback overhead and feedback precision.

In a first aspect, a method for reporting CSI is provided. The method may be performed by the terminal device or may be performed by a component (e.g., a circuit or chip) disposed in the terminal device. The present application is not limited in this regard.

Specifically, the method comprises the following steps: generating first indication information, wherein the first indication information is used for indicating M frequency domain vectors to be reported, and the M frequency domain vectors are used for constructing a precoding matrix of one or more frequency domain units; the precoding matrix of each frequency domain unit comprises Z columns, wherein a Z-th column in the Z columns is constructed based on a frequency domain vector corresponding to the Z-th column in the M frequency domain vectors, and the frequency domain vector corresponding to the Z-th column is determined from an initial frequency domain vector corresponding to the Z-th column; the initial frequency domain vector corresponding to each column comprises one or more groups of initial frequency domain vectors, each group of initial frequency domain vectors corresponds to one group of priorities, and each initial frequency domain vector corresponding to each column corresponds to one column of priorities; the M frequency domain vectors are determined from predetermined initial frequency domain vectors based on a column priority corresponding to each of the Z columns and a group priority of one or more groups of initial frequency domain vectors corresponding to each column; wherein M is more than or equal to 1, Z is more than or equal to 1 and less than or equal to Z, Z is more than or equal to 1, and M, Z and Z are integers; and sending the first indication information.

In the embodiment of the present application, the overhead related to the number of frequency domain vectors may include an indication overhead of the position of the space frequency vector pair, for example, when the position of the space frequency vector pair is indicated by the bitmap, the number of frequency domain vectors affects the length of the bitmap; the cost related to the number of the frequency domain vectors can also comprise quantization cost of the weighting coefficients, and the number of the frequency domain vectors influences the quantization cost of the weighting coefficients because the number of the frequency domain vectors influences the reporting number of the weighting coefficients; the overhead associated with the number of frequency domain vectors may also include an indication overhead of the frequency domain vectors, which may be affected by the number of frequency domain vectors, since the number of frequency domain vectors may affect the number of bits of the index corresponding to the combination of the indication frequency domain vectors.

Based on the above technical solution, when the pre-allocated physical uplink resources are insufficient, the terminal device may select a part of initial frequency domain vectors with higher priority to report based on the column priority and the group priority of the initial frequency domain vectors, and discard the initial frequency domain vectors with lower priority. Meanwhile, as the weighting coefficient corresponds to the space-frequency vector pair, a part of initial frequency domain vectors with lower priority are discarded, and the weighting coefficient corresponding to the part of initial frequency domain vectors with lower priority is also discarded. Thus, feedback overhead can be reduced from at least two dimensions of the position of the weighting coefficients and quantization information. In some cases, the indication overhead of the frequency domain vector may be further reduced. In addition, since the discarded initial frequency domain vector is an initial frequency domain vector with lower priority and the discarded initial frequency domain vector has a corresponding relation with the weighting coefficient, the limited physical uplink resource can be used for reporting the CSI to a greater extent, and the influence of the corresponding feedback precision is smaller. I.e. a high compromise efficiency is obtained between feedback accuracy and feedback overhead. And, since the total overhead required after discarding a portion of the initial frequency domain vector may be less than the maximum number of bits that can be carried by the physical uplink resources pre-allocated by the network device. This partially free resource may be used to indicate more weighting coefficients corresponding to the frequency domain vectors that have not been discarded. Therefore, physical uplink resources can be fully utilized, and the feedback precision is improved.

With reference to the first aspect, in some possible implementation manners of the first aspect, when the initial frequency-domain vectors corresponding to each column include multiple sets of initial frequency-domain vectors, the set priorities of the multiple sets of initial frequency-domain vectors are different from each other.

That is, the initial frequency domain vector for each column may be further divided into one or more group priorities.

With reference to the first aspect, in some possible implementation manners of the first aspect, the column priorities corresponding to the Z columns are different from each other.

That is, Z columns correspond to Z column priorities. Each column corresponds to a column priority.

With reference to the first aspect, in some possible implementation manners of the first aspect, the initial frequency domain vectors corresponding to the Z columns include T sets of initial frequency domain vectors corresponding to T sets of priorities, and the initial frequency domain vectors corresponding to each column belong to one or more sets of the T sets of initial frequency domain vectors in order of from high to low of the sets of priorities; and, the same set of initial frequency-domain vectors includes initial frequency-domain vectors corresponding to one or more of the Z column priorities; wherein T is more than or equal to 1 and is an integer.

That is, among the initial frequency-domain vectors corresponding to different column priorities, some of the initial frequency-domain vectors may have the same group priority. The initial frequency-domain vectors corresponding to the Z columns may be partitioned by T group priorities, and the initial frequency-domain vectors in each group priority may be further partitioned by a column priority. Thereby obtaining the initial frequency domain vectors with different priorities.

With reference to the first aspect, in some possible implementation manners of the first aspect, M frequency domain vectors are used to construct a precoding matrix of one or more frequency domain units, Z columns in the precoding matrix correspond to the Z transmission layers, and column priorities corresponding to the Z columns decrease with increasing sequence numbers of the corresponding transmission layers.

That is, the network device and the terminal device may determine the ordering of the column priorities based on the same rule.

In general, the smaller the sequence number of the transport layer, the more important the transport layer. The column priority of the Z columns may be decremented as the sequence number of the corresponding transport layer increases.

With reference to the first aspect, in certain possible implementation manners of the first aspect, the method further includes: and transmitting second indication information for indicating a column prioritization of the Z columns, the column prioritization of the Z columns being determined from a predefined plurality of column prioritization.

That is, there may be a plurality of column prioritizations, and the terminal device may select one from the plurality of prioritizations to use according to actual needs. The terminal device may report the information about the selected column prioritization, such as an index, to the network device, so that the network device determines the column prioritization.

With reference to the first aspect, in certain possible implementation manners of the first aspect, the method further includes: transmitting third indication information, wherein the third indication information is used for indicating: the column corresponding to the initial frequency domain vector which is not reported in the initial frequency domain vector corresponding to the same group priority.

That is, the column prioritization may not be predefined. The terminal device can select the initial frequency domain vector which can be discarded preferentially according to the actual requirement. The terminal device may report the initial frequency domain vector corresponding to the priority discard to the network device, for example, by indicating Z indication bits corresponding to Z columns, etc. So that the network device determines the indication of the terminal device determines the column corresponding to the initial frequency domain vector discarded by the terminal device.

Further optionally, the number of initial frequency domain vectors corresponding to any two columns in the Z columns is the same.

That is, the number of initial frequency domain vectors corresponding to the Z columns is the same.

In one possible design, the first indication information is carried in a second portion of the CSI report. The length of the second part of the CSI report is indeterminate and requires the network device to estimate from the information in the first part of the CSI report in order to properly decode the second part of the CSI report.

Since the column prioritization of the Z columns may not be predetermined, the network device may not accurately estimate the length of the second portion of the CSI report if the number of initial frequency domain vectors corresponding to each column is different.

In a second aspect, a method of reporting CSI is provided. The method may be performed by a network device or may be performed by a component (e.g., a circuit or chip) configured in the network device. The present application is not limited in this regard.

Specifically, the method comprises the following steps: receiving first indication information, wherein the first indication information is used for indicating M frequency domain vectors, and the M frequency domain vectors are used for constructing a precoding matrix of one or more frequency domain units; the precoding matrix of each frequency domain unit comprises Z columns, wherein a Z-th column in the Z columns is constructed based on a frequency domain vector corresponding to the Z-th column in the M frequency domain vectors, and the frequency domain vector corresponding to the Z-th column is determined from an initial frequency domain vector corresponding to the Z-th column; the initial frequency domain vector corresponding to each column comprises one or more groups of initial frequency domain vectors, each group of initial frequency domain vectors corresponds to one group of priorities, and each initial frequency domain vector corresponding to each column corresponds to one column of priorities; the M frequency domain vectors are determined from predetermined initial frequency domain vectors based on a column priority corresponding to each of the Z columns and a group priority of one or more groups of initial frequency domain vectors corresponding to each column; wherein M is more than or equal to 1, Z is more than or equal to 1 and less than or equal to Z, Z is more than or equal to 1, and M, Z and Z are integers; m frequency domain vectors are determined according to the first indication information.

In the embodiment of the present application, the overhead related to the number of frequency domain vectors may include an indication overhead of the position of the space frequency vector pair, for example, when the position of the space frequency vector pair is indicated by the bitmap, the number of frequency domain vectors affects the length of the bitmap; the cost related to the number of the frequency domain vectors can also comprise quantization cost of the weighting coefficients, and the number of the frequency domain vectors influences the quantization cost of the weighting coefficients because the number of the frequency domain vectors influences the reporting number of the weighting coefficient coefficients; the overhead associated with the number of frequency domain vectors may also include an indication overhead of the frequency domain vectors, which may be affected by the number of frequency domain vectors, since the number of frequency domain vectors may affect the number of bits of the index corresponding to the combination of the indication frequency domain vectors.

Based on the above technical solution, under the condition of pre-allocated physical uplink resources, the terminal device may select a part of initial frequency domain vectors with higher priority to report based on the column priority and the group priority of the initial frequency domain vectors, and discard the initial frequency domain vectors with lower priority. Meanwhile, as the weighting coefficient corresponds to the space-frequency vector pair, a part of initial frequency domain vectors with lower priority are discarded, and the weighting coefficient corresponding to the part of initial frequency domain vectors with lower priority is also discarded. Thus, feedback overhead can be reduced from at least two dimensions of the position of the weighting coefficients and quantization information. In some cases, the indication overhead of the frequency domain vector may be further reduced. In addition, since the discarded initial frequency domain vector is an initial frequency domain vector with lower priority and the discarded initial frequency domain vector has a corresponding relation with the weighting coefficient, the limited physical uplink resource can be used for reporting the CSI to a greater extent, and the influence of the corresponding feedback precision is smaller. I.e. a high compromise efficiency is obtained between feedback accuracy and feedback overhead.

With reference to the second aspect, in some possible implementations of the second aspect, the initial frequency-domain vectors corresponding to each column include a plurality of sets of initial frequency-domain vectors, and set priorities of the plurality of sets of initial frequency-domain vectors are different from each other.

With reference to the second aspect, in some possible implementations of the second aspect, the column priorities of the Z columns are different from each other.

With reference to the second aspect, in some possible implementation manners of the second aspect, the initial frequency-domain vectors corresponding to the Z columns include T sets of initial frequency-domain vectors corresponding to T sets of priorities, and the initial frequency-domain vectors corresponding to each column belong to one or more sets of the T sets of initial frequency-domain vectors in order of from high to low of the sets of priorities; and, the same set of initial frequency-domain vectors includes initial frequency-domain vectors corresponding to one or more of the Z column priorities; wherein T is more than or equal to 1 and is an integer.

With reference to the second aspect, in some possible implementations of the second aspect, M frequency domain vectors are used to construct a precoding matrix of one or more frequency domain units, where Z columns in the precoding matrix correspond to Z transmission layers, and a column priority of the Z columns decreases with increasing sequence number of the corresponding transmission layer.

With reference to the second aspect, in certain possible implementations of the second aspect, the method further includes: and receiving second indication information, wherein the second indication information is used for indicating the column priority orders of the Z columns, and the column priority orders of the Z columns are determined from a plurality of predefined column priority orders.

With reference to the second aspect, in certain possible implementations of the second aspect, the method further includes: receiving third indication information, wherein the third indication information is used for indicating: the column corresponding to the initial frequency domain vector which is not reported in the initial frequency domain vector corresponding to the same group priority.

With reference to the first aspect or the second aspect, in some possible implementations, the initial frequency domain vectors corresponding to the Z columns correspond to two group priorities; corresponding to the z-th columnAmong the initial frequency-domain vectors, the frequency-domain vector belonging to the high group priority is +.>Frequency domain vector belonging to low group priority is +.>A plurality of; alternatively, the frequency domain vector belonging to the high group priority is +.>Frequency domain vector belonging to low group priority is +.>A plurality of; wherein (1)>And->Is an integer.

That is, the initial frequency domain vectors corresponding to the Z columns may be divided into two groups of priorities, a high group priority and a low group priority, respectively. The prioritization of the two group priorities is: the high group priority is higher than the low group priority. The number of initial frequency domain vectors corresponding to each column, each group priority, may be determined based on the predefined calculation formula described above.

With reference to the first aspect or the second aspect, in some possible implementations, the initial frequency domain vectors corresponding to the Z columns correspond to three group priorities; corresponding to the z-th column Among the initial frequency-domain vectors, the frequency-domain vector belonging to the highest group priority is +.>Frequency domain vectors belonging to higher group priority are +.>The frequency domain vector belonging to the lowest group priority is +.>A plurality of; alternatively, the frequency domain vector belonging to the highest group priority is +.>The frequency domain vector belonging to the higher group priority is +.>The frequency domain vector belonging to the lowest group priority is +.>And a plurality of the above-mentioned components, wherein,and->Is an integer.

That is, the initial frequency domain vectors corresponding to the Z columns may be divided into three group priorities, namely, a highest group priority, a higher group priority, and a lowest group priority. The three group priorities are prioritized as: the highest group priority is higher than the higher group priority, which is higher than the lowest group priority. The number of initial frequency domain vectors corresponding to each column, each group priority, may be determined based on the predefined calculation formula described above.

With reference to the first aspect or the second aspect, in some possible implementations, the first indication information is carried in a channel state information CSI report.

Specifically, the first indication information may be carried in the second portion of the CSI report, for example. The second portion of the CSI report may include, in addition to the first indication information, indication information of spatial vectors, location indication (e.g., bitmap) of spatial vector pairs, quantization information of weighting coefficients, and the like. The present application is not limited in this regard.

With reference to the first aspect or the second aspect, in some possible implementations, the CSI report further includes a length ofIs a bitmap of (2); wherein L represents the number of spatial vectors used for constructing the precoding matrix, M ^z Representing the number of frequency domain vectors used to construct the z-th column of the precoding matrix, the bitmap indicating whether a space-frequency vector pair corresponding to each column is selected for constructing the precoding matrix, the space-frequency vector pair corresponding to the z-th column being composed of L space vectors and M ^z Combining the frequency domain vectors to obtain; l is greater than or equal to 1, M ^z 1 or more, and L and M ^z Are integers.

As can be seen from the length calculation formula of the bitmap, when a part of the initial frequency domain vector is discarded, the length of the bitmap is reduced, so that the length of the CSI report can be reduced, and the feedback overhead is reduced

In a third aspect, a method for reporting CSI is provided. The method may be performed by the terminal device or may be performed by a component (e.g., a circuit or chip) disposed in the terminal device. The present application is not limited in this regard.

Specifically, the method comprises the following steps: generating fourth indication information, wherein the fourth indication information is used for indicating J frequency domain vectors to be reported, the J frequency domain vectors are used for constructing precoding vectors of one or more frequency domain units, and the J frequency domain vectors are obtained from J ₀ J is more than or equal to 1 and less than or equal to J in the initial frequency domain vectors according to a preset rule ₀ And J, J ₀ Are integers; and transmitting the fourth indication information.

In a fourth aspect, a method for reporting CSI is provided. The method may be performed by a network device or by a component (e.g., a circuit or chip) disposed in the network device. The present application is not limited in this regard.

Specifically, the method comprises the following steps: receiving fourth indication information for indicating J pieces ofFrequency domain vectors, the J frequency domain vectors being used to construct precoding vectors for one or more frequency domain units, the J frequency domain vectors being derived from J ₀ J is more than or equal to 1 and less than or equal to J in the initial frequency domain vectors according to a preset rule ₀ And J, J ₀ Are integers; and determining the J frequency domain vectors according to the fourth indication information.

Based on the above technical solution, when the pre-allocated physical uplink resources are insufficient, the terminal device may discard a portion of the initial frequency domain vectors based on the number of the initial frequency domain vectors and a preset rule. Since the number of reported frequency domain vectors is reduced, the indication overhead of the positions of the associated space frequency vector pairs and the quantization overhead of the weighting coefficients are also reduced, and in some cases, the indication overhead of the frequency domain vectors is also reduced. Furthermore, since the total overhead required after discarding a portion of the initial frequency domain vector may be less than the maximum number of bits that can be carried by the pre-allocated physical uplink resources of the network device. This partially free resource may be used to indicate more weighting coefficients corresponding to the frequency domain vectors that have not been discarded. Therefore, physical uplink resources can be fully utilized, and the feedback precision is improved.

With reference to the third aspect or the fourth aspect, in some possible implementations, the preset rule includes: based on the number J of initial frequency domain vectors ₀ Determining at least the number of reported frequency domain vectors according to a predefined intervalAn optional value.

The number of the frequency domain vectors reported by the terminal device through the fourth indication information may be selected from the at least one optional value.

Optionally, the predefined interval is 1. The at least one selectable value may include: j (J) ₀ －1，……，2，1。

It should be understood that the values of the predefined intervals listed above are merely examples, with the predefined intervals being 2 or other values. The plurality of selectable values determined may also be different based on the different values of the interval. The values of the intervals and the specific values of the at least one optional value are not limited in the application.

With reference to the third aspect or the fourth aspect, in some possible implementations, the preset rule includes: based on the number J of initial frequency domain vectors ₀ And at least one predefined optional coefficient, determining at least one optional value for the reported number of frequency domain vectors.

Optionally, the at least one optional coefficient includes: 3/4,1/2,1/4.

Based on the at least one optional coefficient, at least one optional report number may be obtained. For example, the number of the cells to be processed, or (F)>Alternatively, [3J ₀ /4]，[J ₀ /2]，[J ₀ /4]。

Or, based on at least one optional coefficient, at least one optional report number may be obtained. For example, the number of the cells to be processed,

optionally, the at least one optional factor comprises 1/2.

Based on the at least one optional coefficient, at least one optional report number may be obtained. For example, the number of the cells to be processed,or (F)>Alternatively, [ J ₀ /2]。

optionally, the at least one optional factor comprises 2/3,1/3.

Based on the at least one optional coefficient, at least one optional report number may be obtained. For example, the number of the cells to be processed, or (F)>Alternatively, [2J ₀ /3]，[J ₀ /3]。

optionally, the at least one optional factor comprises 3/4,1/2.

Based on the at least one optional coefficient, at least one optional report number may be obtained. For example, the number of the cells to be processed, or (F)>Alternatively, [3J ₀ /4]，[J ₀ /2]。

wherein,representing a round up->Representing a rounding down []Representing a nearby rounding. After the protocol defines a certain set of optional coefficients and a certain manner of determining the number of optional reports, the network device and the terminal device may determine the at least one optional report number in the same manner.

It should be understood that the values of the optional coefficients listed above are merely examples and should not be construed as limiting the application in any way. The value of the optional coefficient is not limited in this application.

It should also be understood that the preset rules listed above are examples only and should not be construed as limiting the present application in any way. Based on the same conception, the person skilled in the art can extend further possible preset rules.

The terminal device may determine at least one optional reporting number by means of the preset rules listed above. The terminal device can calculate the required reporting overhead according to the at least one selectable reporting number in sequence from large to small. And reporting the frequency domain vector corresponding to each transmission layer based on the reporting number under the condition that the selected reporting number can meet that the required total cost is smaller than or equal to the maximum bit number which can be borne by the physical uplink resource. The reported number is J as described above.

With reference to the third aspect or the fourth aspect, in some possible implementations, the J frequency domain vectors correspond to one of a plurality of transmission layers, and the number of reported frequency domain vectors corresponding to any two of the plurality of transmission layers is the same.

Because the maximum reporting number of the frequency domain vectors corresponding to each transmission layer is the same, the terminal device can determine the reporting number of the frequency domain vectors corresponding to each transmission layer based on the same maximum reporting number and a preset rule. The number of the frequency domain vectors reported by the terminal equipment based on any two transmission layers is the same, so that the terminal equipment is convenient to realize; and meanwhile, the network equipment is also convenient to determine the reporting number of the frequency domain vectors.

With reference to the third aspect or the fourth aspect, in some possible implementations, the fourth indication information is carried in a CSI report.

Specifically, the fourth indication information described above may be carried in the second portion of the CSI report, for example. The second portion of the CSI report may include, in addition to the fourth indication information, for example, indication information of a spatial vector, a position indication (e.g., a bitmap) of a spatial vector pair, quantization information of a weighting coefficient, and the like. The present application is not limited in this regard.

With reference to the third aspect or the fourth aspect, in some possible implementations, the CSI report further includes a bitmap with a length of 2l×z×j; wherein Z represents a rank, L represents the number of spatial vectors used for constructing the precoding vector, J represents the number of frequency domain vectors used for constructing the precoding vector, the bitmap is used for indicating whether a space-frequency vector pair is selected for constructing the precoding vector, and the space-frequency vector pair is obtained by combining L spatial vectors and J frequency domain vectors; l is greater than or equal to 1, Z is greater than or equal to 1, and L and Z are integers.

As can be seen from the length calculation formula of the bitmap, when a part of the initial frequency domain vector is discarded, the length of the bitmap is also reduced, so that the length of the CSI report can be reduced, and the feedback overhead can be reduced.

In a fifth aspect, a communication device is provided comprising individual modules or units for performing the method of the first aspect and any of the possible implementations of the first aspect.

Specifically, the communication device includes a processing unit and a transceiver unit.

The processing unit is used for generating first indication information, wherein the first indication information is used for indicating M frequency domain vectors to be reported, and the M frequency domain vectors are used for constructing a precoding matrix of one or more frequency domain units; the precoding matrix of each frequency domain unit comprises Z columns, a Z-th column in the Z columns is constructed based on a frequency domain vector corresponding to the Z-th column in the M frequency domain vectors, and the frequency domain vector corresponding to the Z-th column is determined from an initial frequency domain vector corresponding to the Z-th column; the initial frequency domain vector corresponding to each column comprises one or more groups of initial frequency domain vectors, each group of initial frequency domain vectors corresponds to one group of priorities, and each initial frequency domain vector corresponding to each column corresponds to one column of priorities; the M frequency domain vectors are determined from predetermined initial frequency domain vectors based on a column priority corresponding to each of the Z columns and a group priority of one or more groups of initial frequency domain vectors corresponding to each column; wherein M is more than or equal to 1, Z is more than or equal to 1 and less than or equal to Z, Z is more than or equal to 1, and M, Z and Z are integers; the receiving and transmitting unit is used for transmitting the first indication information.

With reference to the fifth aspect, in some possible implementation manners of the fifth aspect, when the initial frequency-domain vectors corresponding to each column include multiple sets of initial frequency-domain vectors, the set priorities of the multiple sets of initial frequency-domain vectors are different from each other.

With reference to the fifth aspect, in some possible implementation manners of the fifth aspect, the column priorities corresponding to the Z columns are different from each other.

With reference to the fifth aspect, in some possible implementation manners of the fifth aspect, the initial frequency-domain vectors corresponding to the Z columns include T sets of initial frequency-domain vectors corresponding to T sets of priorities, and the initial frequency-domain vectors corresponding to each column belong to one or more sets of the T sets of initial frequency-domain vectors in order of from high to low of the sets of priorities; and, the same set of initial frequency-domain vectors includes initial frequency-domain vectors corresponding to one or more of the Z column priorities; wherein T is more than or equal to 1 and is an integer.

With reference to the fifth aspect, in some possible implementation manners of the fifth aspect, the M frequency domain vectors are used to construct a precoding matrix of one or more frequency domain units, Z columns in the precoding matrix correspond to Z transmission layers, and column priorities corresponding to the Z columns decrease with increasing sequence numbers of the corresponding transmission layers.

With reference to the fifth aspect, in certain possible implementation manners of the fifth aspect, the transceiver unit is further configured to send second indication information, where the second indication information is used to indicate a column priority ordering of the Z columns, and the column priority ordering of the Z columns is determined from a predefined plurality of column priority orderings.

With reference to the fifth aspect, in certain possible implementation manners of the fifth aspect, the transceiver unit is further configured to send third indication information, where the third indication information is used to indicate: the column corresponding to the initial frequency domain vector which is not reported in the initial frequency domain vector corresponding to the same group priority.

With reference to the fifth aspect, in some possible implementation manners of the fifth aspect, the number of initial frequency domain vectors corresponding to any two columns in the Z columns is the same.

In a sixth aspect, there is provided a communication device comprising means or units for performing the method of the second aspect and any one of the possible implementations of the second aspect.

Specifically, the communication device includes a transceiver unit and a processing unit.

The receiving and transmitting unit is used for receiving first indication information, wherein the first indication information is used for indicating M frequency domain vectors, and the M frequency domain vectors are used for constructing precoding matrixes of one or more frequency domain units; the precoding matrix of each frequency domain unit comprises Z columns, a Z-th column in the Z columns is constructed based on a frequency domain vector corresponding to the Z-th column in the M frequency domain vectors, and the frequency domain vector corresponding to the Z-th column is determined from an initial frequency domain vector corresponding to the Z-th column; the initial frequency domain vector corresponding to each column comprises one or more groups of initial frequency domain vectors, each group of initial frequency domain vectors corresponds to one group of priorities, and each initial frequency domain vector corresponding to each column corresponds to one column of priorities; the M frequency domain vectors are determined from predetermined initial frequency domain vectors based on a column priority corresponding to each of the Z columns and a group priority of one or more groups of initial frequency domain vectors corresponding to each column; wherein M is more than or equal to 1, Z is more than or equal to 1 and less than or equal to Z, Z is more than or equal to 1, and M, Z and Z are integers; and determining the M frequency domain vectors according to the first indication information.

With reference to the sixth aspect, in some possible implementations of the sixth aspect, when the initial frequency-domain vectors corresponding to each column include multiple sets of initial frequency-domain vectors, the set priorities of the multiple sets of initial frequency-domain vectors are different from each other.

With reference to the sixth aspect, in some possible implementations of the sixth aspect, the column priorities of the Z columns are different from each other.

With reference to the sixth aspect, in some possible implementation manners of the sixth aspect, the initial frequency-domain vectors corresponding to the Z columns include T sets of initial frequency-domain vectors corresponding to T sets of priorities, and the initial frequency-domain vectors corresponding to each column belong to one or more sets of the T sets of initial frequency-domain vectors in order of from high to low of the sets of priorities; and, the same set of initial frequency-domain vectors includes initial frequency-domain vectors corresponding to one or more of the Z column priorities; wherein T is more than or equal to 1 and is an integer.

With reference to the sixth aspect, in some possible implementations of the sixth aspect, the M frequency domain vectors are used to construct a precoding matrix of one or more frequency domain units, Z columns in the precoding matrix correspond to Z transmission layers, and column priorities corresponding to the Z columns decrease with increasing sequence numbers of the corresponding transmission layers.

With reference to the sixth aspect, in some possible implementation manners of the sixth aspect, the transceiver unit is further configured to receive second indication information, where the second indication information is used to indicate a column priority ordering of the Z columns, and the column priority ordering of the Z columns is determined from a predefined plurality of column priority orderings.

With reference to the sixth aspect, in certain possible implementation manners of the sixth aspect, the transceiver unit is further configured to receive third indication information, where the third indication information is used to indicate: the column corresponding to the initial frequency domain vector which is not reported in the initial frequency domain vector corresponding to the same group priority.

With reference to the sixth aspect, in some possible implementation manners of the sixth aspect, the number of initial frequency domain vectors corresponding to any two columns in the Z columns is the same.

With reference to the fifth aspect or the sixth aspect, in some possible implementations, the initial frequency domain vectors corresponding to the Z columns correspond to two group priorities; corresponding to the z-th columnAmong the initial frequency-domain vectors, the frequency-domain vector belonging to the high group priority is +.>Frequency domain vector belonging to low group priority is +.>A plurality of; alternatively, the frequency domain vector belonging to the high group priority is +. >Frequency domain vector belonging to low group priority is +.>A plurality of; wherein (1)>And->Is an integer.

With reference to the fifth aspect or the sixth aspect, in some possible implementations, the initial frequency domain vectors corresponding to the Z columns correspond to three group priorities; corresponding to the z-th columnAmong the initial frequency-domain vectors, the frequency-domain vector belonging to the highest group priority is +.>Frequency domain vectors belonging to higher group priority are +.>The frequency domain vector belonging to the lowest group priority is +.>A plurality of; alternatively, the frequency domain vector belonging to the highest group priority is +.>The frequency domain vector belonging to the higher group priority is +.>The frequency domain vector belonging to the lowest group priority is +.>And (3) wherein->And->Is an integer.

With reference to the fifth aspect or the sixth aspect, in some possible implementations, the first indication information is carried in a CSI report.

With reference to the fifth or sixth aspect, in some possible implementations, the CSI report furtherComprising a length ofIs a bitmap of (2); wherein L represents the number of spatial vectors used for constructing the precoding matrix, M ^z Representing the number of frequency domain vectors used to construct the z-th column of the precoding matrix, the bitmap indicating whether a space-frequency vector pair corresponding to each column is selected for constructing the precoding matrix, the space-frequency vector pair corresponding to the z-th column being composed of L space-frequency vectors and M ^z Combining the frequency domain vectors to obtain; l is greater than or equal to 1, M ^z 1 or more, and L and M ^z Are integers.

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

The processing unit is configured to generate fourth indication information, where the fourth indication information is configured to indicate J frequency domain vectors to be reported, the J frequency domain vectors are used to construct precoding vectors of one or more frequency domain units, and the J frequency domain vectors are determined from J ₀ J is more than or equal to 1 and less than or equal to J in the initial frequency domain vectors according to a preset rule ₀ And J, J ₀ Are integers; the transceiver unit is configured to transmit the fourth indication information.

In an eighth aspect, there is provided a communication device comprising means or units for performing the method of the fourth aspect and any one of the possible implementations of the fourth aspect.

Wherein the transceiver unit is configured to receive fourth indication information, where the fourth indication information is configured to indicate J frequency domain vectors, where the J frequency domain vectors are used to construct precoding vectors of one or more frequency domain units, and where the J frequency domain vectors are derived from J ₀ J is more than or equal to 1 and less than or equal to J in the initial frequency domain vectors according to a preset rule ₀ And J, J ₀ Are integers; the processing unit is used for according to the firstThe four indication information determines the J frequency domain vectors.

With reference to the seventh aspect or the eighth aspect, in some possible implementations, the preset rule includes: based on the number J of initial frequency domain vectors ₀ At least one optional value is determined for the number of reports of the frequency domain vector at predefined intervals.

With reference to the seventh aspect or the eighth aspect, in some possible implementations, the preset rule includes: based on the number J of initial frequency domain vectors ₀ And at least one predefined optional coefficient, determining at least one optional value for the reported number of frequency domain vectors.

With reference to the seventh aspect or the eighth aspect, in some possible implementations, the J frequency domain vectors correspond to one of a plurality of transmission layers, and the number of reported frequency domain vectors corresponding to any two of the plurality of transmission layers is the same.

With reference to the seventh aspect or the eighth aspect, in some possible implementations, the fourth indication information is carried in a CSI report.

With reference to the seventh aspect or the eighth aspect, in some possible implementations, the CSI report further includes a bitmap with a length of 2l×z×j; wherein Z represents a rank, L represents the number of spatial vectors used for constructing the precoding vector, J represents the number of frequency domain vectors used for constructing the precoding vector, the bitmap is used for indicating whether a space-frequency vector pair is selected for constructing the precoding vector, and the space-frequency vector pair is obtained by combining L spatial vectors and J frequency domain vectors; l is greater than or equal to 1, Z is greater than or equal to 1, and L and Z are integers.

In a ninth aspect, a communications apparatus is provided that includes a processor. The processor is coupled to the memory and operable to execute instructions in the memory to implement the method of the first or third aspect and any one of the possible implementations of the first or third aspect. Optionally, the communication device further comprises a memory. Optionally, the communication device further comprises a communication interface, and the processor is 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 device. When the communication device is a chip configured in a terminal apparatus, the communication interface may be an input/output interface.

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

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

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

In an eleventh aspect, there is provided a processor comprising: input circuit, output circuit and processing circuit. The processing circuit is configured to receive a signal via the input circuit and transmit a signal via the output circuit, such that the processor performs the method of the first to fourth aspects and any one of the possible implementations of the first to fourth 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 output signal may be output by, for example and without limitation, a transmitter and transmitted by a transmitter, and the input circuit and the output circuit may be the same circuit, which functions as the input circuit and the output circuit, respectively, at different times. The embodiments of the present application do not limit the specific implementation manner of the processor and the various circuits.

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

Optionally, the processor is one or more, and the memory is one or more.

Alternatively, the memory may be integrated with the processor or the memory may be separate from the processor.

In a specific implementation process, the memory may be a non-transient (non-transitory) memory, for example, 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 should be appreciated that the related data interaction process, for example, transmitting the indication information, may be a process of outputting the indication information from the processor, and the receiving the capability information may be a process of receiving the input capability information by the processor. Specifically, the data output by the processor may be output to the transmitter, and the input data received by the processor may be from the receiver. Wherein the transmitter and receiver may be collectively referred to as a transceiver.

The processing means in the twelfth aspect may be one or more chips. The processor in the processing device may be implemented by hardware or may be implemented by software. When implemented in 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 in the processor, or may reside outside the processor, and exist separately.

In a thirteenth aspect, there is provided a 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 above first to fourth aspects and any one of the possible implementations of the first to fourth aspects.

In a fourteenth aspect, there is provided 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 above first to fourth aspects and any one of the possible implementations of the first to fourth aspects.

A fifteenth aspect provides a communication system comprising the aforementioned network device and terminal device.

Drawings

FIG. 1 is a schematic diagram of a communication system suitable for use in the methods provided by embodiments of the present application;

FIG. 2 is a schematic flow chart of a method for reporting CSI according to an embodiment of the present application;

fig. 3 is a schematic flowchart of a method for reporting CSI provided in another embodiment of the present application;

FIG. 4 is a schematic block diagram of a communication device provided by an embodiment of the present application;

fig. 5 is a schematic structural diagram of a terminal device provided in 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.

Detailed Description

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

The technical solution of the embodiment of the application can be applied to various communication systems, for example: global system for mobile communications (Global System for Mobile communications, GSM), code division multiple access (Code Division Multiple Access, CDMA) system, wideband code division multiple access (Wideband Code Division Multiple Access, WCDMA) system, general packet radio service (General Packet Radio Service, GPRS), long term evolution (Long Term Evolution, LTE) system, LTE frequency division duplex (Frequency Division Duplex, FDD) system, LTE time division duplex (Time Division Duplex, TDD), universal mobile telecommunications system (Universal Mobile Telecommunication System, UMTS), worldwide interoperability for microwave access (Worldwide Interoperability for Microwave Access, wiMAX) communication system, future fifth generation (5th Generation,5G) communication system or new radio access technology (new radio Access Technology, NR), car-to-other devices (Vehicle-to-X V X), where V2X may include car-to-internet (Vehicle to network, V2N), car-to-car (V2V), car-to-infrastructure (Vehicle to infrastructure, V2I), car-to-pedestrian (Vehicle to pedestrian, V2P) and the like, workshop communication long term evolution technology (Long Term Evolution-Vehicle, LTE-V), car networking, machine-type communication (Machine type communication, MTC), internet of things (Internet of Things), machine-to-Machine (Machine-89, machine-M) and the like, machine-to Machine (Machine-56M) and the like.

In this embodiment of the present application, the network device may be any device having a wireless transceiver function. The apparatus includes, but is not limited to: an evolved Node B (eNB), a radio network controller (radio network controller, RNC), a Node B (Node B, NB), a base station controller (base station controller, BSC), a base transceiver station (base transceiver station, BTS), a home base station (home evolved NodeB, or a home Node B, HNB, for example), a Base Band Unit (BBU), an Access Point (AP) in a wireless fidelity (wireless fidelity, wiFi) system, a wireless relay Node, a wireless backhaul Node, a transmission point (transmission point, TP), or a transmission reception point (transmission and reception point, TRP), etc., may also be 5G, e.g., NR, a gNB in a system, or a transmission point (TRP or TP), one or a group of base stations (including multiple antenna panels) in a 5G system, or may also be a network Node constituting a gNB or a transmission point, such as a baseband unit (BBU), or a Distributed Unit (DU), etc.

In some deployments, the gNB may include a Centralized Unit (CU) and DUs. The gNB may also include an active antenna unit (active antenna unit, AAU). The CU implements part of the functionality of the gNB and the DU implements part of the functionality of the gNB, e.g. the CU is responsible for handling non-real time protocols and services, implementing radio resource control (radio resource control, RRC), packet data convergence layer protocol (packet data convergence protocol, PDCP) layer functions. The DUs are responsible for handling physical layer protocols and real-time services, implementing the functions of the radio link control (radio link control, RLC), medium access control (media access control, MAC) and Physical (PHY) layers. The AAU realizes part of physical layer processing function, radio frequency processing and related functions of the active antenna. Since the information of the RRC layer may eventually become information of the PHY layer or be converted from the information of the PHY layer, under this architecture, higher layer signaling, such as RRC layer signaling, may also be considered to be transmitted by the DU or by the du+aau. It is understood that the network device may be a device comprising one or more of a CU node, a DU node, an AAU node. In addition, the CU may be divided into network devices in an access network (radio access network, RAN), or may be divided into network devices in a Core Network (CN), which is not limited in this application.

The network device provides services for the cell, and the terminal device communicates with the cell through transmission resources (e.g., frequency domain resources, or spectrum resources) allocated by the network device, where the cell may belong to a macro base station (e.g., macro eNB or macro gNB, etc.), or may belong to a base station corresponding to a small cell (small cell), where the small cell may include: urban cells (metro cells), micro cells (micro cells), pico cells (pico cells), femto cells (femto cells) and the like, and the small cells have the characteristics of small coverage area and low transmitting power and are suitable for providing high-rate data transmission services.

In the embodiments of the present application, the terminal device may also be referred to as a 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 embodiments of the present application may be a mobile phone (mobile phone), a tablet (pad), a computer with a wireless transceiving function, a Virtual Reality (VR) terminal device, an augmented reality (augmented reality, AR) terminal device, a wireless terminal in an industrial control (industrial control), a wireless terminal in an unmanned driving (self driving), a wireless terminal in a remote medical (remote medium), a wireless terminal in a smart grid (smart grid), a wireless terminal in a transportation security (transportation safety), a wireless terminal in a smart city (smart city), a wireless terminal in a smart home (smart home), a cellular phone, a cordless phone, a session initiation protocol (session initiation protocol, SIP) phone, a wireless local loop (wireless local loop, WLL) station, a personal digital assistant (personal digital assistant, PDA), a handheld device with a wireless communication function, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal in a smart city (smart city) or an evolved-from-to-land (PLMN) network, a public network (PLMN) or the like.

The wearable device can also be called as a wearable intelligent device, and is a generic name for intelligently designing daily wearing and developing wearable devices by applying a wearable technology, such as glasses, gloves, watches, clothes, shoes and the like. The wearable device is a portable device that is worn directly on the body or integrated into the clothing or accessories of the user. The wearable device is not only a hardware device, but also can realize a powerful function through software support, data interaction and cloud interaction. The generalized wearable intelligent device includes full functionality, large size, and may not rely on the smart phone to implement complete or partial functionality, such as: smart watches or smart glasses, etc., and focus on only certain types of application functions, and need to be used in combination with other devices, such as smart phones, for example, various smart bracelets, smart jewelry, etc. for physical sign monitoring.

Furthermore, the terminal device may also be a terminal device in an internet of things (internet of things, ioT) system. IoT is an important component of future information technology development, and its main technical feature is to connect an item with a network through a communication technology, so as to implement man-machine interconnection and an intelligent network for object interconnection.

To facilitate an understanding of the embodiments of the present application, a communication system suitable for use in the embodiments of the present application will be described in detail with reference to fig. 1. Fig. 1 shows a schematic diagram of a communication system suitable for use in the communication method and the communication apparatus of the embodiments 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 101 shown in fig. 1; the communication system 100 may also include at least one terminal device, such as the terminal devices 102-107 shown in fig. 1. Wherein the terminal devices 102 to 107 may be mobile or stationary. One or more of network device 101 and terminal devices 102-107 may each communicate over a wireless link. Each network device may provide communication coverage for a particular geographic area and may communicate with terminal devices located within the coverage area.

Alternatively, the terminal devices may communicate directly with each other. Direct communication between terminal devices may be implemented, for example, using device-to-device (D2D) technology or the like. As shown in the figure, communication may be directly performed between the terminal devices 105 and 106 and between the terminal devices 105 and 107 using D2D technology. Terminal device 106 and terminal device 107 may communicate with terminal device 105 separately or simultaneously.

Terminal devices 105 to 107 may also communicate with network device 101, respectively. For example, may communicate directly with network device 101, as terminal devices 105 and 106 in the figures may communicate directly with network device 101; or indirectly with the network device 101, as in the figure the terminal device 107 communicates with the network device 101 via the terminal device 106.

It should be appreciated that fig. 1 illustrates schematically one network device and a plurality of terminal devices, as well as communication links between the communication devices. Alternatively, the communication system 100 may include a plurality of network devices, and the coverage area of each network device may include other numbers of terminal devices, such as more or fewer terminal devices. The present application is not limited in this regard.

Each of the above-described communication apparatuses, such as the network apparatus 101 and the terminal apparatuses 102 to 107 in fig. 1, may be configured with a plurality of antennas. The plurality of antennas may include at least one transmitting antenna for transmitting signals and at least one receiving antenna for receiving signals. In addition, each communication device may additionally include a transmitter chain and a receiver chain, each of which may include a plurality of components (e.g., processors, modulators, multiplexers, demodulators, demultiplexers, antennas, etc.) associated with the transmission and reception of signals, as will be appreciated by one skilled in the art. Thus, communication between the network device and the terminal device may be via multiple antenna technology.

Optionally, the wireless communication system 100 may further include a network controller, a mobility management entity, and other network entities, which embodiments of the present application are not limited thereto.

In order to facilitate understanding of the embodiments of the present application, the following terms referred to in the embodiments of the present application are briefly described.

1. Precoding technology: the transmitting device (such as a network device) can process the signal to be transmitted by means of the precoding matrix matched with the channel state under the condition that the channel state is known, so that the precoded signal to be transmitted is matched with the channel, and the complexity of eliminating the influence among the channels by the receiving device (such as a terminal device) is reduced. Thus, by precoding the signal to be transmitted, the received signal quality (e.g., signal-to-interference plus noise ratio (signal to interference plus noise ratio, SINR), etc.) is improved. Therefore, by adopting the precoding technology, the transmission of the sending device and the multiple receiving devices on the same time-frequency resource can be realized, that is, multi-user multiple input multiple output (multiple user multiple input multiple output, MU-MIMO) is realized.

It should be understood that the description of the precoding technology is merely exemplary for easy understanding, and is not intended to limit the protection 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 channel information (such as, but not limited to, a channel matrix) cannot be known, precoding is performed using a pre-set precoding matrix or a weighting method. For brevity, the details thereof are not described in detail herein.

2. Channel state information reporting (CSI report): may also be referred to simply as CSI. 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). For example, the CSI report may include, but is not limited to, a precoding matrix indicator (precoding matrix indicator, PMI), a Rank Indicator (RI), a channel quality indicator (channel quality indicator, CQI), a channel state information reference signal (channel state information reference signal, CSI-RS resource indicator (CRI), layer Indicator (LI), etc., it should be understood that the specific contents of the above-listed CSI are only exemplary and should not constitute any limitation to the present application.

Taking the example that the terminal equipment reports the CSI to the network equipment. The terminal device may report one or more CSI reports in a time unit (e.g., slot), where each CSI report may correspond to a configuration condition for CSI reporting. The configuration condition of the CSI reporting may be determined by, for example, higher layer signaling such as an information element (information element, IE) CSI reporting configuration (CSI-reportirconfig) in a Radio Resource Control (RRC) message. The terminal device may generate a CSI report based on a CSI reporting configuration. The CSI reporting configuration may be used to indicate time domain behavior, bandwidth, format corresponding to reporting quality (reporting quality), etc. of CSI reporting. The time domain behaviors include, for example, periodicity (periodic), semi-persistent (semi-persistent), and aperiodic (aperiodic).

In the embodiment of the application, when the terminal equipment generates the CSI report, the content in the CSI report can be divided into two parts. For example, the CSI report may include a first portion and a second portion. The first part may also be referred to as part 1 (part 1). The second part may also be referred to as part 2 (part 2). 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 based on 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 information carried in the first portion. The network device may determine the payload size of the second portion based on the information obtained from the first portion, and then decode the second portion to obtain the information carried in the second portion.

In the present embodiment, "payload size" is often used interchangeably with "length", "overhead", "bit overhead", etc., and in the context of the specific description that follows, the meaning expressed is consistent.

It will be appreciated that the first and second parts are similar to part 1 (part 1) and part 2 (part 2) of the CSI defined in 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 the reporting of PMI, the enumeration of contents in the first and second portions of CSI report in the following embodiments only relates to the related information of PMI, and not to others. It should be understood that this should not constitute any limitation to the present application. In addition to the information contained or indicated by the first and second parts of the CSI report listed in the embodiments below, the first part of the CSI report may also include one or more of CQI and LI, or may also include other information that may define feedback overhead in advance, and the second part of the CSI report may also include other information. The present application is not limited in this regard.

It should also be understood that the first and second portions are named for ease of distinction only and should not constitute any limitation to the present application. The present application does not exclude the possibility to define the first part and the second part as other names in future protocols.

3. Precoding Matrix Indication (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. The channel matrix may be determined by the terminal device by means of channel estimation or the like or based on channel reciprocity. It should be understood that the specific method for determining the precoding matrix by the terminal equipment is not limited to the foregoing, and specific implementation may refer to the prior art, and for brevity, it is not listed here.

For example, the precoding matrix may be obtained by performing singular value decomposition (singular value decomposition, SVD) on a channel matrix or a covariance matrix of the channel matrix, or may be obtained by performing eigenvalue decomposition (eigenvalue decopomsition, EVD) on a covariance matrix of the channel matrix. It should be understood that the above-listed determination of the precoding matrix is merely an example and should not constitute any limitation to the present application. The manner in which the precoding matrix is determined may be referred to in the art and is not listed here for brevity.

The precoding matrix determined by the terminal device may be referred to as a precoding matrix to be fed back, or a precoding matrix to be reported. The terminal equipment can indicate the precoding matrix to be fed back through the PMI so as to facilitate the network equipment to recover the precoding matrix based on the PMI. 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 downlink channel measurement, the higher the approximation degree between the precoding matrix determined by the network device according to the PMI and the precoding matrix determined by the terminal device, the more the determined precoding matrix for data transmission can be adapted to the downlink channel, so that the transmission quality of signals can be improved. It should be understood that PMI is only a designation and should not constitute any limitation to this application. The present application does not exclude the possibility of defining signalling of other names in future protocols for the same or similar functions.

It should be noted that, according to the method provided by the embodiment of the present application, the network device may determine the precoding matrix corresponding to one or more frequency domain units based on feedback of the terminal device. The precoding matrix thus determined by the network device may be directly used for downlink data transmission; some beamforming methods may also be performed, including Zero Forcing (ZF), regularized zero-forcing (RZF), minimum mean-square error (MMSE), maximizing signal-to-leakage-and-noise (SLNR), etc., to obtain a precoding matrix that is ultimately used for downlink data transmission. The present application is not limited in this regard. Unless specifically described, the precoding matrices referred to hereinafter may all refer to precoding matrices determined based on the methods provided herein.

4. Frequency domain unit: the units of frequency domain resources may represent different granularity of frequency domain resources. The frequency domain units may include, for example, but not limited to, a channel quality indication (channel quality indicator, CQI) sub-band (subband), 1/R of CQI sub-band, resource Block (RB), sub-carrier, resource block group (resource block group, RBG), or pre-coded resource block group (precoding resource block group, PRG), etc. Wherein R is a positive integer. R may take the value of 1 or 2, for example. In one possible implementation, the value of R may be configured to the terminal device by signaling in advance by the network device.

In the embodiment of the present application, the PMI may be used to indicate a precoding matrix corresponding to a frequency domain unit, which may also be referred to as a PMI subband. Where R may represent a ratio of granularity of CQI subbands to granularity of PMI subbands. When R is 1, that is, the granularity of one CQI subband is the same as the granularity of one PMI subband; when R is 2, that is, the granularity of one CQI subband is twice the granularity of one PMI subband.

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

The channel matrix corresponding to the frequency domain unit may refer to a channel matrix determined based on channel estimation and feedback of the reference signal on the frequency domain unit. The channel matrix corresponding to a frequency domain unit may be used to determine a precoding matrix to be used for subsequent transmission of data over the frequency domain unit. Hereinafter, the channel matrix corresponding to the frequency domain unit may also be simply referred to as a channel matrix of the frequency domain unit.

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

The antenna port may also be simply referred to as a port. An antenna port may be understood as a transmitting antenna identified by a receiving device or a spatially distinguishable transmitting antenna. One antenna port may be preconfigured for each virtual antenna, each virtual antenna may be a weighted combination of multiple physical antennas, each antenna port may correspond to one reference signal, and thus each antenna port may be referred to as a port of one reference signal, e.g., CSI-RS port, sounding reference signal (sounding reference signal, SRS) port, etc.

The reference signal may be a reference signal that is not precoded, or may be a precoded reference signal, which is not limited in this application. When the reference signal is a precoded reference signal, the reference signal port may be a transmit antenna port. The transmit antenna port may be referred to as a separate transceiver unit (TxRU).

Hereinafter, for convenience of explanation, it is assumed that the spatial vector is denoted as u. The length of the space vector u can be the number N of transmitting antenna ports in one polarization direction _s ，N _s Is more than or equal to 1 and is an integer. The spatial vector may be, for example, of length N _s Is a column vector or a row vector of (a). The present application is not limited in this regard.

Optionally, the spatial vector is a discrete fourier transform (Discrete Fourier Transform, DFT) vector. The DFT vector may refer to a vector in the DFT matrix.

Optionally, the spatial vector is an oversampled DFT vector. The oversampled DFT vector may refer to a vector in the oversampled DFT matrix.

In one possible design, the spatial vector may be, for example, a two-dimensional (2D) -DFT vector v defined in a type II codebook in NR protocol TS 38.214 version 15 (release 15, R15) _l,m . In other words, the spatial vector may be a 2D-DFT vector or an oversampled 2D-DFT vector. For brevity, a detailed description of the 2D-DFT vector is omitted herein.

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

6. Space vector set: a variety of spatial vectors of different lengths may be included to correspond to different numbers of antenna ports. In the embodiment of the present application, the spatial vector used to construct the precoding vector may be determined from a set of spatial vectors. In other words, the spatial vector set 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 _s A spatial vector of N _s The spatial vectors may be orthogonal to each other. Each spatial vector in the set of spatial vectors may be a vector in a 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 ₁ And N ₂ Then N _s ＝N ₁ ×N ₂ 。N _s 、N ₁ And N ₂ Are all positive integers.

The N is _s The spatial vectors can be denoted as u, for example ₁ ，u ₂ ，……，The N is _s The individual spatial vectors can construct matrix B _s ，The matrix B _s May be used to perform spatial compression as described below to select one or more spatial vectors used to construct the precoding matrix.

In another possible design, the set of spatial vectors may be determined by an oversampling factor O _s Extended to O _s ×N _s And (3) spatial vectors. In this case, the set of spatial vectors may include O _s A plurality of subsets, each subset may include N _s And (3) spatial vectors. N in each subset _s The spatial vectors may be orthogonal to each other. Each spatial vector in the set of spatial vectors may be taken from an oversampled 2D-DFT matrix. Wherein the oversampling factor O _s Is a positive integer. Specifically, O _s ＝O ₁ ×O ₂ ，O ₁ May be an oversampling factor in the horizontal direction, O ₂ May be an oversampling factor in the vertical direction. O (O) ₁ ≥1，O ₂ ≥1，O ₁ 、O ₂ Are not 1 at the same time, and are all integers.

The (o) th of the set of spatial vectors _s (1≤o _s ≤O _s And o is o _s Integer) N in a subset _s The spatial vectors can be respectively written as, for exampleThen based on the o _s N in the subset _s The individual spatial vectors can construct a matrix +.> From O _s The matrices respectively formed by the subsets may be used for spatial compression as described below to select one or more spatial vectors used to construct the precoding matrix.

It should be understood that the present application is not limited to a particular form of set of spatial vectors and a particular form of spatial vectors.

7. Frequency domain vector (frequency domain vector): or delay vector, etc. 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 signals may travel multiple paths from the transmit antenna to the receive antenna as they travel through the wireless channel. Multipath delays cause frequency selective fading, i.e., variations in the frequency domain channel. Therefore, the change rule of the channel in the frequency domain caused by time delay on different transmission paths can be represented by different frequency domain vectors. Since the phase change of the channel in each frequency domain unit is related to the time delay, the time delay of the signal in the time domain can be equivalent to the phase gradual change of the frequency domain as known by the Fourier transform. The frequency domain vector may also be referred to as a delay vector. In other words, the frequency domain vector may also be used to represent the delay characteristics of the channel.

In the embodiment of the present application, the frequency domain vector may be used to construct a combination of a plurality of spatial vectors and frequency domain vectors with the spatial vectors, or simply referred to as a space-frequency vector pair, to be used to construct a precoding vector.

Hereinafter, for convenience of explanation, it is assumed that the frequency domain vector is denoted as v. The length of the frequency domain vector can be denoted as N ₃ ，N ₃ Is more than or equal to 1 and is an integer. The frequency domain vector may be, for example, of length N ₃ Is a column vector or a row vector of (a). The present application is not limited in this regard.

Wherein N is ₃ For example, the number of frequency domain units (such as PMI subbands) to be reported may be the same, or may be greater than the number of frequency domain units (such as PMI subbands) to be reported.

Optionally, the frequency domain vector is a DFT vector. The DFT vector may refer to a column vector in the DFT matrix.

Optionally, the frequency domain vector is an oversampled DFT vector. The oversampled DFT vector may refer to a column vector in the oversampled DFT matrix.

Optionally, the frequency domain vector is an inverse discrete fourier transform (Inverse Discrete Fourier Transform, IDFT) vector. The IDFT vector may refer to a column vector in the IDFT matrix.

Alternatively, the frequency domain vector may be an oversampled IDFT vector. The oversampled IDFT vector may refer to a column vector in the oversampled IDFT matrix.

8. A set of frequency domain vectors: a variety of different length frequency domain vectors may be included. In embodiments of the present application, the frequency domain vector used to construct the precoding vector may be determined from a set of frequency domain vectors. In other words, 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, the set of frequency domain vectors may include N ₃ And frequency domain vectors. The N is ₃ The frequency domain vectors may be mutually orthogonal one to the other. Each frequency domain vector in the set of frequency domain vectors may be a vector in a DFT matrix or an IDFT matrix.

For example, the N _f The frequency domain vectors can be denoted as v, for example ₁ ，v ₂ ，……，The N is _f The individual frequency domain vectors can construct a matrix B _f ，/>The matrix B _f May be used to perform frequency domain compression, described below, to select one or more frequency domain vectors used to construct the precoding matrix.

In another possible design, the set of frequency domain vectors may be scaled by an oversampling factor O _f Extended to O _f ×N ₃ And frequency domain vectors. In this case, the set of frequency domain vectors may include O _f A plurality of subsets, each subset may include N ₃ And frequency domain vectors. N in each subset ₃ The frequency domain vectors may be mutually orthogonal one to the other. Each subset may be referred to as an orthogonal set. Each frequency domain vector in the set of frequency domain vectors may be a vector in an oversampled DFT matrix or an oversampled IDFT matrix. Wherein the oversampling factor O _f Is a positive integer.

For example, the o-th in the set of frequency domain vectors _f (1≤o _f ≤O _f And o is o _f Integer) N in a subset ₃ The frequency domain vectors can be respectively written as, for example Then based on the o _f N in the subset ₃ The individual frequency domain vectors can construct a matrix +.> From O _f The matrices of the matrices respectively formed of the subsets may be used for frequency domain compression, described later, to select one or more frequency domain vectors for constructing the precoding matrix.

It should be understood that the present application is not limited to a particular form of the set of frequency domain vectors and to a particular form of the frequency domain vectors.

9. Space-frequency vector pair: a space vector and a frequency domain vector may be combined to obtain a space-frequency vector pair. A space-frequency vector pair may include a space-domain vector and a frequency-domain vector. A space-frequency component matrix is obtained from the space-domain vector and the frequency-domain vector in a space-frequency vector pair, e.g., a space-frequency component matrix is obtained by multiplying a space-frequency vector by the conjugate transpose of a frequency-domain vector. The space-frequency component matrix described herein is relative to the space-frequency matrix described below. The space-frequency matrix may be derived from a weighted summation of a plurality of space-frequency component matrices. Each term used for weighting may therefore be referred to as a component of a space-frequency matrix, referred to herein as a space-frequency component matrix.

10. Space-frequency matrix: in the embodiment of the present application, the space-frequency matrix may be understood as an intermediate quantity for determining a precoding matrix or a channel matrix corresponding to each frequency domain unit. For the terminal device, the space-frequency matrix may be determined by a precoding matrix or a channel matrix corresponding to each frequency domain unit. For a network device, the space-frequency matrix may be derived from a weighted sum of a plurality of space-frequency component matrices for recovering a channel matrix or a precoding matrix.

For example, the space-frequency matrix may be denoted as H,wherein w is ₁ To->Is with N ₃ N corresponding to each frequency domain unit ₃ Each column vector may be a precoding matrix corresponding to each frequency domain unit, and the length of each column vector may be N _s . The N is ₃ The column vectors respectively correspond to N ₃ Precoding vectors for the frequency domain units. I.e. the space-frequency matrix can be regarded as N ₃ And combining the precoding vectors corresponding to the frequency domain units to form a joint matrix.

In one possible design, the space-frequency matrix may correspond to a transport layer. The space-frequency matrix is said to correspond to the transport layers because the terminal device can feedback the frequency domain vector and weighting coefficients on a per transport layer basis (it is understood that the space domain vector is shared among multiple transport layers). The network device determines a space-frequency matrix based on feedback from the terminal device, i.e., a space-frequency matrix corresponding to the transport layer. The space-frequency matrix corresponding to the transmission layer may be directly used to determine the precoding matrix corresponding to each frequency domain unit. The precoding matrix corresponding to a certain frequency domain unit may be configured by, for example, column vectors corresponding to the same frequency domain unit in the space-frequency matrix corresponding to each transmission layer. For example, the nth (N is not less than 1 and not more than N) in the space-frequency matrix corresponding to each transmission layer ₃ And N is an integer) column vectors are extracted, and the dimension N can be obtained by arranging the column vectors from left to right according to the order of the transmission layers _s And (3) a matrix of x Z, wherein Z represents a rank, and Z is more than or equal to 1 and is an integer. The matrix can be used as a precoding matrix W of an nth frequency domain unit ⁽ⁿ⁾ 。

It should be understood that the space-frequency matrix is only one representation of the intermediate quantities used to determine the precoding matrix or channel matrix, and should not constitute any limitation to this application. For example, the column vectors in the space-frequency matrix are connected in turn from left to right, or arranged according to other predefined rules, a length N can be obtained _s ×N ₃ Which may be referred to as a space-frequency vector.

It should also be understood that the dimensions of the space-frequency matrix and space-frequency vector shown above are merely examples and should not constitute any limitation to the present application. For example, the space-frequency matrix may also be of dimension N ₃ ×N _s Is a matrix of (a) and (b). Wherein each row vector may correspond to one frequency domain unit for determining a precoding vector of the corresponding frequency domain unit.

In addition, the dimensions of the space-frequency matrix may be further extended when the transmit antennas are configured with multiple polarization directions. For example, for a dual polarized directional antenna, the space-frequency matrix may have a dimension of 2N _s ×N ₃ Or N ₃ ×2N _s . It should be understood that the present application is not limited to the number of polarization directions of the transmitting antenna.

In another possible design, the space-frequency matrix may correspond to a receive antenna. The space-frequency matrix is said to correspond to the receive antennas because the terminal device can feedback the frequency domain vector and weighting coefficients on a per receive antenna basis (it should be understood that the space domain vector can be shared among multiple receive antennas). The network device determines a space-frequency matrix based on feedback from the terminal device, i.e. a space-frequency matrix corresponding to the receiving antennas. The space-frequency matrix corresponding to the receiving antenna can be used to construct a downlink channel matrix corresponding to each frequency domain unit, so as to determine a precoding matrix corresponding to each frequency domain unit. The channel matrix corresponding to a certain frequency domain unit may be determined, for example, by a column vector corresponding to the same frequency domain unit in a space-frequency matrix corresponding to each receiving antenna. For example, the nth (N is not less than 1 and not more than N) in the space-frequency matrix corresponding to each receiving antenna ₃ And N is an integer) column vectors are extracted, and the column vectors are arranged from left to right in the order of the receiving antennas to obtain a column vector with a dimension of 2N _s Matrix of x R, 2N _s The number of transmitting antenna ports in two polarization directions is represented, R represents the number of receiving antennas, and R is more than or equal to 1 and is an integer. The dimension is 2N _s The matrix of the xR is subjected to conjugate transposition to obtain a channel matrix V of an nth frequency domain unit ⁽ⁿ⁾ 。

10. Two-domain compression: compression in two dimensions, spatial domain compression and frequency domain compression, may be included. Spatial compression may specifically refer to selecting one or more spatial vectors from a set of spatial vectors as vectors for constructing the precoding vector. Frequency domain compression may refer to selecting one or more frequency domain vectors from a set of frequency domain vectors as vectors for constructing a precoding vector. As described above, 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 the one or more frequency domain vectors may construct one or more spatial frequency component matrices. The weighted sum of the one or more space-frequency component matrices may be used to construct a space-frequency matrix corresponding to one of the transport layers. In other words, the space-frequency matrix may be approximated as a weighted sum of the space-frequency component matrices constructed from the selected one or more spatial vectors and the one or more frequency domain vectors. Based on the space-frequency matrix corresponding to one transmission layer, the precoding vector corresponding to each frequency domain unit on the transmission layer can be determined.

In particular, the selected one or more spatial vectors may form a matrix W ₁ Wherein W is ₁ Each of the column vectors corresponds to a selected one of the spatial vectors. The selected one or more frequency domain vectors may form a matrix W ₃ Wherein W is ₃ Corresponding to a selected one of the frequency domain vectors. The space-frequency matrix H may be represented as a result h=w of linear combination of the selected one or more spatial vectors and the selected one or more frequency domain vectors ₁ CW ₃ ^H 。

Taking a space-frequency matrix corresponding to a transmission layer as an example, the space-frequency matrix corresponding to one transmission layer is h=w ₁ CW ₃ ^H 。

If a dual polarized directional antenna is used, L space vectors, W can be selected for each polarization direction ₁ The dimension of (2) may be 2N _s X 2L. In one possible implementation, the two polarization directions may employ the same L spatial vectorsWherein (1)>For example, L spatial vectors selected from the set of spatial vectors described above may be used. At this time, W ₁ Can be expressed as +.>Wherein->The first of the L spatial vectors selected is represented by l=1, 2, …, L.

When the rank Z is greater than 1, the spatial vectors used by the respective transmission layers may be different from each other, i.e., the respective transmission layers use independent spatial vectors; or may be the same, i.e., multiple transport layers share L spatial vectors. In the embodiment of the present application, it is assumed that a plurality of transport layers share L spatial vectors.

When the rank Z is greater than 1, the frequency domain vectors used by the respective transmission layers may be different from each other, i.e., the respective transmission layers use independent frequency domain vectors; it may also be the same, i.e. multiple transport layers share M frequency domain vectors. In the embodiment of the present application, it is assumed that each transmission layer uses a separate frequency domain vector. For example, the frequency domain vector corresponding to the Z < Z > th transport layer (Z is an integer) among the Z transport layers is M ^z The frequency domain vector corresponding to the z-th transmission layer reported by the terminal equipment is M ^z And each. M is M ^z Is more than or equal to 1 and is an integer. In this case, the precoding vector corresponding to the z-th transmission layer may be based on the above L spatial vectors and M ^z And constructing the frequency domain vector.

For the z-th transport layer, W ₃ ^H May be of dimension M ^z ×N ₃ 。W ₃ May be a frequency domain vector. At this time W ₁ W is equal to each spatial vector sum W ₃ Each frequency domain vector in the (a) can form a space frequency vector pair, each space frequency vector pair can correspond to a weighting coefficient, and then 2L space vectors and M are provided ^z 2L×M constructed from frequency domain vectors ^z The space-frequency vector pairs can be equal to 2L×M ^z The weighting coefficients are in one-to-one correspondence.

For the z-th transport layer, C is defined by 2L M ^z The dimension of the coefficient matrix formed by the weighting coefficients can be 2L multiplied by M ^z . The first row in the coefficient matrix C may correspond to the first spatial vector in the first polarization direction of 2L spatial vectors, and the l+l row in the coefficient matrix C may correspond to the first spatial vector in the second polarization direction of 2L spatial vectors. M (M is more than or equal to 1 and less than or equal to M) in the coefficient matrix C ^z And M is an integer) columns may correspond to M ^z An mth frequency domain vector of the frequency domain vectors.

Therefore, in the feedback manner of the two-domain compression, the terminal device may feed back the spatial vector shared by the Z transmission layers, the frequency domain vector corresponding to each of the Z transmission layers, and the position of the space-frequency vector pair selected to construct the precoding matrix and the weighting coefficient of each space-frequency vector pair.

The position of the space-frequency vector pair used for constructing the precoding matrix specifically refers to the position of the space-frequency vector used for constructing the precoding matrix in the space-frequency vector reported by the terminal equipment and the position of the frequency-domain vector used for constructing the precoding matrix in the frequency-domain vector reported by the terminal equipment. Since each space-frequency vector pair corresponds to a non-zero weighting coefficient (non-zero coefficient for short), the position of the space-frequency vector pair used to construct the precoding matrix is the position of the weighting coefficient (or non-zero coefficient).

It should be understood that the above-listed relationships between each transmission layer and the spatial vector, and the frequency domain vector are only examples, and should not be construed as limiting the application.

It should also be appreciated that the space-frequency matrices H and W shown above ₁ 、W ₃ Is merely an example, and should not be construed as limiting the present application in any way. Based on the same concepts, one skilled in the art can mathematically transform the above relationship to arrive at other representations for the space-frequency matrices H and W ₁ 、W ₃ A calculation formula of the relation. For example, the space-frequency matrix H may also be expressed as h=w ₁ CW ₃ . In this case, W ₃ May correspond to a selected one of the frequency domain vectors.

Since the two-domain compression compresses in the spatial domain and the frequency domain respectively, the terminal device can feed back the selected one or more spatial vectors and one or more frequency domain vectors to the network device during feedback, without feeding back the weighting coefficients (including amplitude and phase) of the sub-bands respectively based on each frequency domain unit (such as sub-band). 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 equipment based on feedback of the terminal equipment can still be well adapted to the channel.

It should be understood that, in the foregoing, for ease of understanding the two-domain compression, the terms space-frequency matrix, space-frequency vector, and the like are defined separately, but this should not constitute any limitation to the present application. The specific process of determining the PMI by the terminal device is an internal implementation behavior of the terminal device, and the specific process of determining the PMI by the terminal device is not limited in the present application. The specific process of determining the precoding matrix by the network device according to the PMI is an internal implementation behavior of the network device, and the specific process of determining the precoding matrix by the network device according to the PMI is not limited. The terminal device and the network device may respectively employ different algorithms to generate the PMI and recover the precoding matrix.

11. Weighting coefficient: in two-domain compression, the weighting coefficients may also be referred to as space-frequency combining coefficients, and the like. Each weighting coefficient may correspond to one spatial vector and one frequency domain vector selected for constructing the precoding vector, or to one spatial frequency component matrix, or to one spatial frequency vector pair. The weighting coefficients may be used to represent weights of a space-frequency component matrix constructed by constructing the precoding vector versus one spatial and frequency domain vector.

Each weighting coefficient may include an amplitude and a phase. For example, the weighting coefficient ae ^jθ Where a is amplitude and θ is phase.

In a plurality of space-frequency vector pairs selected by the terminal device for constructing the precoding matrix, each space-frequency vector pair may correspond to a weighting coefficient. Among the plurality of weighting coefficients corresponding to the plurality of space-frequency vector pairs, the magnitude (or magnitude) of some weighting coefficients may be zero or near zero, and the corresponding quantization value may be zero. The weighting coefficient that quantizes the amplitude by quantizing the value zero may be referred to as a weighting coefficient whose amplitude is zero. Correspondingly, some weighting coefficients have larger magnitudes, and the corresponding quantization values are not zero. The weighting coefficients that quantize the amplitude by a non-zero quantization value may be referred to as amplitude non-zero weighting coefficients. In other words, the plurality of weighting coefficients corresponding to the plurality of space-frequency vector pairs may be composed of one or more weighting coefficients with non-zero magnitudes and one or more weighting coefficients with zero magnitudes.

In the embodiment of the application, the terminal device may report only the weighting coefficient with non-zero amplitude to the network device. These weighting coefficients with non-zero magnitudes may be simply referred to as non-zero coefficients (NZC). In one implementation, the terminal device may indicate the locations of these non-zero coefficients by a bitmap, e.g., by a length of 2L M ^z A bit map indicates whether each space-frequency vector pair corresponds to a weighting coefficient. For example, when a certain indication bit is "0", the weighting coefficient of the space-frequency vector pair corresponding to the indication bit is not reported, and the weighting coefficient of the space-frequency vector pair can be considered as zero; when a certain indication bit is "1", the weighting coefficient indicating the space-frequency vector pair corresponding to the indication bit is reported, and the weighting coefficient of the space-frequency vector pair can be considered as a non-zero coefficient.

It will be appreciated that the location of the non-zero coefficients indicated by the bitmap corresponds to the location of the non-zero coefficients in the coefficient matrix described above. That is, the dimensions described above are 2L M ^z May include selected weighting coefficients and unselected weighting coefficients. Wherein the selected weighting coefficients are non-zero coefficients, and the non-selected weighting coefficients may be represented by zero.

It should also be appreciated that indicating the location of non-zero coefficients by a bitmap is only one possible implementation. For example, the terminal device may also indicate the location of the space-frequency vector pair selected to construct the precoding matrix (i.e., the location of the non-zero coefficients) by an index of the combination of the selected space-frequency vector pairs, and so on. The specific manner in which the position of the non-zero coefficients is indicated is not limited in this application.

The terminal device may further indicate the non-zero coefficients, for example by normalization. Since the specific method for indicating each non-zero coefficient by the terminal device may be the same as the prior art, it will not be described in detail here for brevity. Since quantization information for the weighting coefficient, that is, quantization information for the non-zero coefficient, is referred to in the following embodiments, quantization overhead for the weighting coefficient is referred to as quantization overhead for the non-zero coefficient. Therefore, unless otherwise specified, the meaning of the two expressions is the same.

12. Transport layer (layer): may also be referred to as spatial layers, transport streams, spatial streams, etc. In the embodiment of the present application, the number of transmission layers may be determined by a rank (rank) fed back by the terminal device based on channel measurement. For example, the number of transmission layers may be equal to a rank that the terminal device feeds back based on channel measurements.

For example, the precoding matrix may be determined by SVD of a channel matrix or a covariance matrix of the channel matrix. In the SVD process, different transport layers may be distinguished according to the magnitude of the singular value. For example, the precoding vector determined by the right singular vector corresponding to the largest singular value may be corresponding to the 1 st transmission layer, and the precoding vector determined by the right singular vector corresponding to the smallest singular value may be corresponding to the Z-th transmission layer. That is, singular values corresponding to the 1 st to Z-th transport layers decrease in order.

For another example, the covariance matrix of the channel matrix may be EVD to determine the precoding matrix. In the EVD process, different transport layers may be distinguished according to the magnitude of the characteristic value. 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 Z-th transmission layer. That is, the characteristic values corresponding to the 1 st to Z-th transport layers decrease in order.

It should be understood that distinguishing between different transport layers based on the magnitude of the eigenvalues or the magnitude of the singular values is only one possible implementation and should not constitute any limitation to this application. For example, the protocol may also predefine other criteria for distinguishing transport layers, which are not limited in this application.

Because the physical uplink resources used by the terminal device for reporting the CSI each time are pre-allocated by the network device, the network device cannot ensure that the resources allocated each time are enough to carry all the information of the CSI determined by the terminal device.

For example, the physical uplink resources pre-allocated by the network device are allocated based on the indication overhead required when the rank is 1. When the terminal device determines that the rank is greater than 1 based on the channel measurement, the physical uplink resources pre-allocated by the network device may be insufficient to transmit all the information of the CSI.

An implementation is known, where the terminal device may discard a part of the weighting coefficients in case of insufficient physical uplink resources, so as to reduce feedback overhead. However, discarding the weighting coefficients by the terminal device only reduces the quantization bit overhead of the weighting coefficients, while the length of the bitmap indicating the locations of the weighting coefficients (i.e., the locations of the space-frequency vector pairs) remains unchanged. In fact, however, the discarded weighting coefficients all have "0" indication bits in the bitmap, which results in a significant portion of indication bits in the bitmap being wasted. Therefore, this method of discarding the weighting coefficients does not fully utilize the limited physical uplink resources.

As previously described, the network device may wish to determine the same or similar precoding matrix based on feedback from the terminal device as the precoding matrix determined by the terminal device based on the channel measurements. The degradation of the feedback accuracy may result in a degradation of the transmission performance of the system.

It is therefore desirable to provide a method that can fully utilize limited physical uplink resources to feed back as much information of the downlink channel state determined by the terminal device based on channel measurements to the network device as possible, and reduce discarding as much as possible. Thereby achieving a high tradeoff efficiency between feedback overhead and feedback accuracy.

According to the method for reporting the CSI, under the condition that the physical uplink resources are insufficient, the terminal equipment selects a part of frequency domain vectors to report based on the column priority and the group priority of the initial frequency domain vectors, so that higher compromise efficiency is obtained between feedback overhead and feedback precision.

In order to facilitate understanding of the embodiments of the present application, the following description is first made before describing the embodiments of the present application.

First, embodiments of the present application relate to column priority and group priority. To distinguish between different column priorities and different group priorities, the first, second, etc. numbers are used to distinguish between them. For example, a first column priority, a second column priority to a Z-th column priority; first group priority, second group priority to T-th group priority. The first column priority, the second column priority, and the Z-th column priority are defined to distinguish different column priorities, and the sequence of the Z columns is not limited. The first group priority, the second group priority to the T-th group priority are defined for distinguishing different group priorities, and the order of the T groups is not limited.

In addition, in the following embodiments, the first, second and various numerical 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 indication information, different columns, different transport layers, etc. are distinguished.

Second, in the present embodiment, "for indicating" may include for direct indication and for indirect indication. For example, when describing that certain indication information is used for 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.

The information indicated by the indication information is referred to as information to be indicated, and in a specific implementation process, there are various ways of indicating the information to be indicated, for example, but not limited to, the information to be indicated may be directly 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 indicated indirectly by indicating other information, wherein the other information and the information to be indicated have an association relation. It is also possible to indicate only a part of the information to be indicated, while other parts of the information to be indicated are known or agreed in advance. For example, the indication of the specific information may also be achieved by means of a pre-agreed (e.g., protocol-specified) arrangement sequence of the respective information, thereby reducing the indication overhead to some extent. And meanwhile, the universal part of each information can be identified and indicated uniformly, so that the indication cost caused by independently indicating the same information is reduced. For example, it will be appreciated 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 portion in terms of composition or other properties.

The specific indication means may be any of various existing indication means, such as, but not limited to, the above indication means, various combinations thereof, and the like. Specific details of various indications may be referred to the prior art and are not described herein. As can be seen from the above, for example, when multiple pieces of information of the same type need to be indicated, different manners of indication of different pieces of information may occur. In a specific implementation process, a required indication mode can be selected according to specific needs, and in this embodiment of the present application, the selected indication mode is not limited, so that the indication mode according to the embodiment of the present application should be understood to cover various methods that can enable a party to be indicated to learn information to be indicated.

In addition, there may be other equivalent forms of information to be indicated, 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 array may be formed by interconnecting respective row vectors or column vectors of the matrix, a kronecker product of two vectors may also be represented by a product of one vector and a transposed vector of the other vector, and so on. 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 of the embodiments of the present application should be understood to encompass various manifestations of such features.

The information to be indicated can be sent together as a whole or can be divided into a plurality of pieces of sub-information to be sent separately, and the sending periods and/or sending occasions of the sub-information can be the same or different. The specific transmission method is not limited in this application. The transmission period and/or the transmission 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 transmitting configuration information to the receiving end device. The configuration information may include, for example, but not limited to, 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, e.g., downlink control information (downlink control information, DCI).

Third, in the embodiments of the present application, for convenience of description, when numbering is referred to, numbering may be continued from 1. For example, the Z transport layers may include 1 st transport layer to Z th transport layer, and the 2Z priorities may include priority 1 to priority 2Z. And so on, are not illustrated herein. Of course, the specific implementation is not limited to this, and for example, the serial numbers may be numbered from 0. For example, Z transport layers may include 0 th transport layer through Z-1 th transport layer, 2Z priorities may include priority 0 through priority 2Z-1, and so on.

It should be understood that the foregoing is provided for the purpose of describing the embodiments of the present application, and is not intended to limit the scope of the present application.

Fourth, M is shown by multiple tables in the embodiments of the present application ₀ The priority ordering of the initial frequency domain vectors. It should be understood that the form is merely one possible representation shown for ease of understanding and should not be construed as limiting the present application in any way.

In addition, since the initial frequency domain vector is discarded, the corresponding non-zero coefficient is not required to be reported. The terminal device thus determines which initial frequency-domain vectors to discard, i.e. which initial frequency-domain vectors and their corresponding non-zero coefficients to discard. Accordingly, the "initial frequency-domain vector" in each table below may be replaced by the "initial frequency-domain vector and its corresponding non-zero coefficient".

Fifth, the indications related in the embodiments of the present application mainly include: the method comprises the steps of indicating L spatial vectors shared among Z transmission layers, indicating frequency domain vectors corresponding to each transmission layer, indicating positions of space frequency vector pairs corresponding to each transmission layer and capable of being used for constructing precoding vectors, and quantifying and indicating weighting coefficients corresponding to the space frequency vector pairs of each transmission layer.

The corresponding overhead mainly includes: the indication overhead of L spatial vectors shared among the Z transmission layers, the indication overhead of frequency domain vectors corresponding to each transmission layer, the indication information of the positions of the space frequency vector pairs corresponding to each transmission layer that can be used to construct the precoding vector, and the quantization overhead of weighting coefficients corresponding to the space frequency vector pairs of each transmission layer.

The indications listed above may be carried in CSI reports. However, the overhead of CSI report is not limited to the above listed overhead, and CSI report may further include more information, but is not related to the embodiment of the present application. The maximum number of bits that can be carried by the physical uplink resource described below refers to the maximum number of bits that can be used to carry the above indications, except for other information in the CSI report, remaining in the physical uplink resource.

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

It should be appreciated that the methods provided by 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 comprise at least one network device and at least one terminal device. The network device and the terminal device may communicate via multiple antenna technology.

It should also be understood that the method provided in the embodiment of the present application is not limited to communication between a network device and a terminal device, but may also be applied to communication between a terminal device and a terminal device, etc. The application is not limited to the scenario in which the method is applied. In the embodiments shown below, for ease of understanding and description only, the method provided in the embodiments of the present application will be described in detail by taking the interaction between the network device and the terminal device as an example.

It should also be understood that the embodiments shown below are not particularly limited to the specific structure of the execution body of the method provided by the embodiments of the present application, as long as the communication can be performed by the method provided according to 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, and for example, the execution body of the method provided by the embodiments of the present application may be a terminal device or a network device, or a functional module in the terminal device or the network device that can call the program and execute the program.

It should also be appreciated that the methods provided herein are described in detail below for ease of understanding, taking the feedback approach of two-domain compression as an example. This should not be construed as limiting in any way the context in which the methods provided herein are applicable. The method provided by the application can be applied to other feedback modes for indicating the precoding matrix through feedback beam vectors and weighting coefficients.

Fig. 2 is a schematic flow chart of a method 200 for reporting CSI provided by an embodiment of the present application, shown from a device interaction perspective. As shown in fig. 2, the method 200 may include steps 210 through 230.

For ease of understanding the embodiments of the present application, before describing the method 200 in detail, the following description is made of several parameters and relationships therebetween involved in the method 200:

z denotes a rank that the terminal device feeds back based on the channel measurement. In the embodiment of the present application, the rank fed back by the terminal device based on the channel measurement may be equal to the number of transmission layers.

In the embodiment of the present application, when the network device allocates physical uplink resources in advance, the network device allocates the physical uplink resources based on at least the indication overhead required by rank 1, so that the resource deficiency generally occurs when the rank is greater than 1. So Z is > 1 and Z is a positive integer. For example, Z is 2, 3 or 4. It should be understood that the specific values of the ranks listed here should not constitute any limitation to the present application. The specific value of rank Z is not limited in this application.

In the embodiment of the present application, the precoding matrix determined by the network device based on the feedback of the terminal device may include Z columns, where the Z columns may correspond to the Z transmission layers. Thus, "corresponding to Z columns", i.e., "corresponding to Z transport layers" will be described hereinafter.

In response, a Z-th column of the Z columns of the precoding matrix may correspond to a Z-th transport layer of the Z transport layers. Thus, "corresponding to the z-th column", i.e., "corresponding to the z-th transport layer", will be described hereinafter. Wherein Z may take on values from 1 to Z, and Z is an integer.

The terminal equipment can report L airspace vectors at most based on channel measurement,Sum of frequency domain vectors->And non-zero coefficients. Wherein L, & gt>And->Are all positive integers.

In this embodiment of the present application, the L spatial vectors may be spatial vectors shared by Z transmission layers, and may be used to construct a precoding vector of each frequency domain unit on any one of the Z transmission layers. In other words, the spatial vector corresponding to each transport layer is L. Note that the L spatial vectors may be different from each other.

L represents the maximum number of airspace vectors reported by the terminal equipment. The value of L may be preconfigured by the network device. Therefore, L may also represent the maximum reporting number of the spatial vectors preconfigured by the network device for the terminal device. The number of spatial vectors actually reported by the terminal device may be less than or equal to L. In the embodiment of the present application, for convenience of explanation, it is assumed that the number of spatial vectors actually reported by the terminal device is equal to the maximum reporting number L of spatial vectors preconfigured by the network device for the terminal device.

The frequency domain vectors may include a frequency domain vector corresponding to each of the Z transport layers, e.g., +_ corresponding to the Z-th transport layer>And frequency domain vectors. Wherein->Is a positive integer. The frequency domain vector corresponding to the z-th transport layer may be the same as the L spatial vectors described above and +.>The non-zero coefficients are combined to construct a precoding vector for each frequency domain unit corresponding to the z-th transmission layer.

In one possible design, the maximum reported number of frequency domain vectors corresponding to any two of the Z transport layers is the same. The maximum reported number of frequency domain vectors corresponding to each transmission layer can be determined by, for exampleTo determine. The values of p and R may be signaled to the terminal device by the network device in advance, so that the terminal device determines the maximum reporting number of the frequency domain vector corresponding to each transmission layer. The network device informs the terminal devices p and R of the values through signaling in advance, so that the maximum reporting number of the frequency domain vectors corresponding to each transmission layer can be considered to be configured by the network device.

The number of frequency domain vectors actually reported by the terminal device may be smaller than or equal to the maximum reporting number of the frequency domain vectors preconfigured by the network device. For example, the number of frequency domain vectors corresponding to the z-th transmission layer reported by the terminal device may be less than or equal to the maximum reported number of frequency domain vectors corresponding to the z-th transmission layer preconfigured by the network device.

Optionally, when the rank Z is less than or equal to 2, the value of p is 1/2 or 1/4. Alternatively, when the rank Z is greater than 2, for example Z is 3 or 4, and p has a value of 1/4 or 1/8. Alternatively, R has a value of 1 or 2.

The non-zero coefficients may include non-zero coefficients corresponding to each of the Z transport layers. E.g. corresponding to the z-th transport layer +.>And non-zero coefficients. Wherein->Is a positive integer. The non-zero coefficients corresponding to the z-th transport layer may be combined with the frequency domain vector corresponding to the z-th transport layer and the L spatial vectors described above for constructing the precoding vector of each frequency domain unit corresponding to the z-th transport layer.

In one possible design, when the rank Z is greater than 1, the maximum reporting number of non-zero coefficients is 2K ₀ . That is to say that the first and second,or, when the rank Z is greater than 1, the number of non-zero coefficients reported by the terminal equipment does not exceed 2K ₀ And each.

Here, K ₀ Refers to the maximum reporting number of non-zero coefficients when the rank Z is 1, K ₀ Is a positive integer. In one implementation, K ₀ Can pass throughTo determine. The network device may signal the value of β to the terminal device in advance. M is M _rank1 The maximum report number of the time-frequency domain vector with the rank of 1 is represented. M is M _rank1 For example, the values of (2) can be obtained by +. >To determine. Since the network device indicates the values of p, R and β by signaling in advance, K can also be considered as ₀ Is preconfigured by the network device.

Alternatively, β has a value of 1/4, 1/2, or 3/4.

It should be understood that the above-listed manners of determining the maximum reporting number of the spatial vectors, the maximum reporting number of the frequency domain vectors, and the maximum reporting number of the non-zero coefficients are only one possible design, and should not be construed as limiting the present application. The specific manner of determination is not limited in this application.

It should also be understood that the specific values of the parameters listed above are examples only and should not be construed as limiting the application in any way.

For convenience of explanation of the embodiment of the present application, the following parameters are also defined in the method 200:

M ₀ : and the terminal equipment determines the maximum reporting number of the frequency domain vectors according to the configuration of the network equipment and the rank Z. M is M ₀ Is more than or equal to 1 and is an integer.

In the embodiments of the present application,when the rank Z is greater than 1, M ₀ Specifically, the sum of the maximum reporting numbers of the frequency domain vectors corresponding to each of the Z layers, which are preconfigured by the network device for the terminal device, may be referred to.

For convenience of explanation, it is assumed that the number of frequency domain vectors determined by the terminal device based on channel measurement is equal to the maximum reporting number M of frequency domain vectors determined by the terminal device according to the configuration of the network device and rank Z ₀ . Under the condition of insufficient physical uplink resources, the terminal equipment can discard a part of the frequency domain vectors to be reported, so that the number M of the frequency domain vectors actually reported by the terminal equipment is smaller than M ₀ This will be described in detail in the following examples.

For convenience of distinction and explanation, the M will be described below ₀ The frequency domain vectors are called M ₀ The number of initial frequency domain vectors,the frequency domain vectors actually reported by the terminal device are referred to as M frequency domain vectors. It should be appreciated that the M frequency domain vectors are derived from M ₀ Determined from the initial frequency domain vectors. That is, M frequency domain vectors are M ₀ A subset of the initial frequency domain vectors.

M: the number of frequency domain vectors actually reported by the terminal equipment. When the rank Z is greater than 1, M may specifically refer to a sum of reporting numbers of frequency domain vectors corresponding to each of the Z layers that are reported by the terminal device.

M ^z : the number of frequency domain vectors corresponding to the z-th layer actually reported by the terminal device, or the number of frequency domain vectors actually reported by the terminal device based on the z-th layer. M is M ^z Is more than or equal to 1 and is an integer.

In the embodiments of the present application,

k: the number of non-zero coefficients actually reported by the terminal device. When the rank Z is greater than 1, K may specifically refer to a sum of reporting numbers of non-zero coefficients corresponding to each of the Z layers that are reported by the terminal device. Each non-zero coefficient may correspond to a space-frequency vector pair, or alternatively, each non-zero coefficient may correspond to a space-domain vector and a frequency-domain vector.

K ^z : the number of non-zero coefficients corresponding to the z-th layer actually reported by the terminal device, or the number of non-zero coefficients actually reported by the terminal device based on the z-th layer. K (K) ^z Is more than or equal to 1 and is an integer.

In the embodiments of the present application,

T：M ₀ the initial frequency-domain vectors may be divided into T groups, each of which may include initial frequency-domain vectors corresponding to one or more layers. Each set of initial frequency domain vectors may correspond to a set of priorities. T is more than or equal to 2 and is an integer. That is, M ₀ The initial frequency domain vectors may correspond to at least two group priorities.

The steps in method 200 are described in detail below.

In step 210, the terminal device generates first indication information, where the first indication information is used to indicate M frequency domain vectors, and the M frequency domain vectors are used to construct a precoding matrix of one or more frequency domain units.

Specifically, the first indication information may be determined by the terminal device based on the result of the channel measurement. Wherein the precoding matrix of each frequency domain unit may comprise Z columns. In this embodiment, the Z columns may correspond to Z layers. Each column is a precoding vector of the layer corresponding to this column, or a mathematical transformation of the precoding vector. Each column may be determined based on the frequency domain vector of the terminal device's feedback for the layer to which that column corresponds. For example, the Z-th column of the Z-th columns may be understood as a precoding vector or a mathematical transformation of a precoding vector of the Z-th layer of the Z-th layers. The Z-th column of the Z columns may be determined based on the frequency domain vector fed back by the terminal device for the Z-th layer. Wherein Z may be any integer from 1 to Z. In the following embodiments, for convenience of explanation, the frequency domain vector for determining the z-th column is referred to as a frequency domain vector corresponding to the z-th column.

It should be noted that, in the embodiment of the present application, the above-mentioned M frequency domain vectors may be used to construct a precoding matrix of one or more frequency domain units, which does not mean that the terminal device determines only the M frequency domain vectors based on channel measurement. The number of frequency domain vectors determined by the terminal device based on the channel measurement may be M or greater than M. The frequency domain vectors (whether M or greater than M) determined by the terminal device based on the channel measurements may be used to construct the precoding matrix.

For convenience of distinction and explanation, the frequency domain vector determined by the terminal device based on the channel measurement is referred to as an initial frequency domain vector in the embodiment of the present application. Under the condition of sufficient physical uplink resources, the terminal equipment can report all the determined initial frequency domain vectors to the network equipment. In this case, the number of initial frequency domain vectors determined by the terminal device may be M; and under the condition of insufficient physical uplink resources, the terminal equipment can select a part of frequency domain vectors from the initial frequency domain vectors determined by the terminal equipment and report the part of frequency domain vectors to the network equipment. In this case, the number of initial frequency domain vectors determined by the terminal device may be greater than M.

M is the sum of the numbers of frequency domain vectors corresponding to the Z columns. In the M frequency domain vectors, there may be repetition of frequency domain vectors corresponding to part of the columns, but the number of frequency domain vectors that are repeated does not affect the value of M. Let the number of frequency domain vectors corresponding to the z-th column be M ^z Then

Corresponding to the M frequency domain vectors, the sum of the number of initial frequency domain vectors corresponding to the Z columns determined by the terminal device based on the channel measurement can be recorded as M ₀ ，M ₀ ≥M。M ₀ Among the initial frequency-domain vectors, the initial frequency-domain vector corresponding to the z-th column is

Wherein for the z-th column, theThe initial frequency domain vector is a vector determined by the terminal device to be used to construct the z-th column of the precoding matrix. M is M ^z The frequency domain vector is from->Selected from the initial frequency domain vectors, so that M ^z The frequency domain vectors may also be used to construct the z-th column in the precoding matrix. In case no discarding of frequency domain vectors occurs, < > j->Based on->Z-th column of precoding matrix constructed by initial frequency domain vector and M-based precoding matrix constructed by initial frequency domain vector ^z The z-th column of the precoding matrix constructed by the frequency domain vectors is the same; in case of dropping of frequency domain vectors, +.>The former is slightly more accurate than the latter.

In response, M frequency domain vectors for constructing Z columns of the precoding matrix are derived from M ₀ Selected from the initial frequency domain vectors.

It should be noted that the M frequency domain vectors described above are used to construct the precoding matrix of one or more frequency domain units, and are not meant to represent the precoding matrix, but are determined based on the M frequency domain vectors alone. As already mentioned in the above description of the two-domain compression, the precoding matrix may be determined based on one or more spatial vectors, one or more frequency domain vectors and weighting coefficients for each pair of spatial frequency vectors. The embodiments of the present application mainly relate to discarding frequency domain vectors, so detailed descriptions of space domain vectors and weighting coefficients are omitted. It will be appreciated that the spatial vectors and weighting coefficients may also be determined and fed back by the terminal device based on the results of the channel measurements.

The process by which the terminal device determines the weighting coefficients (i.e., the non-zero coefficients) of the frequency domain vector, the spatial vector, and the space-frequency vector pair is briefly described below in connection with one possible implementation.

The terminal device may determine precoding vectors for the frequency domain units on each transport layer based on the channel measurements. Specifically, the terminal device may estimate the channel matrix based on a reference signal, such as CSI-RS, and determine the precoding vector of each frequency domain unit on each transmission layer by performing singular value decomposition on the channel matrix or the covariance matrix of the channel matrix, or by performing eigenvalue decomposition on the covariance matrix of the channel matrix. It should be appreciated that a specific method of determining the precoding vector based on the channel measurement may refer to the prior art, and a detailed description of this specific procedure is omitted herein for brevity.

The terminal device may construct a space-frequency matrix corresponding to each transmission layer according to the precoding vector of each frequency domain unit on each transmission layer, and may determine at least one space-domain vector, at least one frequency-domain vector, and at least one weighting coefficient corresponding to at least one space-frequency vector pair that may be used to construct the precoding matrix by performing space-domain and frequency-domain DFT on the space-frequency matrix.

As described above, in the embodiment of the present application, Z columns in the precoding matrix correspond to Z transmission layers. Wherein the Z transmission layers share the same L space vectors, and the Z transmission layers respectively use independent frequency domain vectors and weighting coefficients. For the z-th transport layer, the terminal device may determineSum of frequency domain vectors and->And weighting coefficients corresponding to part or all of the space frequency vector pairs. That is, the L spatial vectors are spatial vectors for constructing each of Z columns in the precoding matrix. Column z may correspond to->An initial frequency domain vector +.>And weighting coefficients corresponding to part or all of the space frequency vector pairs.

Since the L spatial vectors are spatial vectors shared by the Z transport layers, the terminal device may determine the L spatial vectors based on a space-frequency matrix of a certain transport layer of the Z transport layers, e.g., the terminal device may determine the L spatial vectors based on a space-frequency matrix of a 1 st transport layer of the Z transport layers; the terminal device may also determine the L spatial vectors based on a space-frequency matrix of each of the Z transport layers.

In one implementation, the terminal device may allocate Z transport layers The space frequency matrix of each transmission layer performs space domain DFT to determine L stronger space vectors. The space-domain DFT on each space-frequency matrix may be performed by the formula C' =u, for example _s ^H H ^z To realize the method.

Wherein H is ^z Representing the space-frequency matrix of the z-th transport layer. For dual polarized directional antennas, the dimension of the space-frequency matrix may be 2N _s ×N ₃ . The terminal device may determine L space vectors based on the space-frequency matrix of the two polarization directions, where the space-frequency matrix H ^z Is 2N in dimension _s ×N ₃ . Of course, the terminal device may also determine L space vectors based on the space-frequency matrix of a certain polarization direction, for example, determine L space vectors based on the space-frequency matrix of the first polarization direction, where the space-frequency matrix H ^z Is of dimension N _s ×N ₃ . The specific implementation of spatial domain compression is not limited in this application.

U _s Representing a matrix constructed from a plurality of spatial vectors in a predefined set of spatial vectors. U (U) _s For example, it may be a matrix B formed by a set of spatial vectors defined above without oversampling _s Or a matrix of a subset of the set of oversampled spatial vectors, e.gU _s The dimension of (2) may be N _s ×N _s To correspond to a space-frequency matrix in one polarization direction. Alternatively U _s Set of airspace vectors B, which may also be defined by the foregoing _s Or->Determining, e.g. by combining spatial vectors B _s Or->Spliced, e.g.)>Or->Its dimension may be 2N _s ×2N _s To correspond to the space-frequency matrix in both polarization directions.

C' represents a coefficient matrix obtained by space-domain DFT, and the dimension can be L×N _s (corresponding to one polarization direction), or, 2L x 2N _s (corresponding to two polarization directions).

Z is valued in the range of 1 to Z, and 2Z dimensions L×N obtained by space domain DFT can be obtained _s Or, Z dimensions of 2L N _s Is a coefficient matrix of (a). Wherein 2Z dimensions are L×N _s Comprises Z coefficient matrices corresponding to each of the two polarization directions.

The terminal device may determine the stronger L spatial vectors based on the coefficient matrix in one polarization direction. For example, the terminal device may determine L rows with larger square sums of the modes according to the square sums of the modes of the elements of each row in the coefficient matrix in the polarization direction.

The terminal device may also determine stronger L spatial vectors based on coefficient matrices in both polarization directions. For example, the terminal device may splice into a dimension of lx2n according to coefficient matrices in two polarization directions _s Is a matrix of (a) in the matrix. Each row in the matrix may correspond to one spatial vector. The terminal device may determine L rows with larger square sums of the modules according to the square sums of the modules of the elements of each row in the matrix. The number of L rows with the larger sum of squares of the modes determined by the Z coefficient matrices may be U _s The sequence numbers of the L columns in (c) can be determined.

Terminal device determined for z-th transport layerThe frequency domain vectors may be determined based on a space-frequency matrix of the z-th transport layer. The DFT of the space-frequency matrix of the z-th transport layer in space and frequency domain can be performed, for example, by the formula c=u _s ^H H ^z U _f Or may also be implemented as C' =u above _s ^H H ^z Further right-hand multiplying U on the basis of (2) _f Obtained. For dual polarized antennas, the dimension of the coefficient matrix C thus obtained may be +.>

Where C represents the coefficient matrix obtained from the spatial and frequency domain DFT. U (U) _f Representing a matrix constructed from a plurality of frequency domain vectors in a predefined set of frequency domain vectors, the dimension of which may be N ₃ ×N ₃ 。U _f For example, it may be a matrix B formed by a set of non-oversampled frequency domain vectors as defined above _f Or a matrix of a subset of the set of oversampled frequency domain vectors, e.g.

The terminal device can determine stronger from the coefficient matrix CA number of columns. The terminal device can determine, for example, that the sum of squares of the modes is large based on the sum of squares of the modes of the elements of the columns in the coefficient matrix C>A number of columns. The stronger +.>The columns can be used to determine the selected +. >And frequency domain vectors. As stronger in coefficient matrix CThe sequence number of the individual columns may be selected +.>Sequence numbers of the individual column vectors, whereby +.>And frequency domain vectors.

Furthermore, the weighting coefficients corresponding to the respective space-frequency vector pairs can be further determined from the coefficient matrix C. As described above, the first row in the coefficient matrix C may correspond to the first spatial vector in the first polarization direction of 2L spatial vectors, and the l+l row in the coefficient matrix C may correspond to the first spatial vector in the second polarization direction of 2L spatial vectors. The mth column in the coefficient matrix C may correspond toThe>And frequency domain vectors.

It should be understood that the methods provided above for determining spatial vectors, frequency domain vectors, and weighting coefficients are merely examples and should not be construed as limiting the present application in any way. The method for determining the spatial vector, the frequency domain vector, and the weighting coefficient may be the same as, for example, the method for determining the beam vector and the weighting coefficient thereof in the feedback mode of the type II (type II) codebook defined in the TS38.214 version 15 (release 15, R15) in the NR protocol.

In addition, the terminal device may determine the spatial vector, the frequency domain vector, and the weighting coefficient through existing estimation algorithms, such as a multiple signal classification algorithm (multiple signal classification algorithm, MUSIC), a Bartlett algorithm, or a rotation invariant subspace algorithm (estimation of signal parameters via rotation invariant technique algorithm, ESPRIT). For brevity, this is not illustrated here.

It should also be appreciated that the matrix U provided above for spatial and frequency domain compression, respectively _s And U _f And are intended to be illustrative only and should not be taken to be limiting in any way. In a specific implementation process, a set of spatial vectors and a frequency domain direction for spatial domain compression and frequency domain compressionThe set of quantities is not limited to the form of the matrix described above. The specific form of the airspace vector set and the frequency domain vector set is related to the specific mode of airspace compression and frequency domain compression of the terminal equipment, and the specific method and the specific process of airspace compression and frequency domain compression are not limited, so that the specific form of the airspace vector set and the frequency domain vector set is not limited.

It should also be understood that the specific process of determining the spatial vectors, the frequency domain vectors and the weighting coefficients by the terminal device is described above by taking only Z transmission layers and L spatial vectors shared by two polarization directions, and each transmission layer uses a separate frequency domain vector as an example. But this should not constitute any limitation to the present application. When the Z transmission layers use independent spatial vectors respectively or the two polarization directions use independent spatial vectors respectively, the terminal device may still determine the spatial vectors, the frequency domain vectors and the weighting coefficients in a similar manner as described above.

It should be noted that, when the predefined airspace vector set includes a plurality of subsets obtained through oversampling and spreading, and/or when the predefined frequency domain vector set includes a plurality of subsets obtained through oversampling and spreading, the specific process of performing DFT of airspace and frequency domain on the airspace matrix by the terminal device to determine airspace vector, frequency domain vector and weighting coefficient is similar, and specific reference may be made to the prior art. For brevity, a detailed description of this specific process is omitted here.

The terminal equipment determines the M based on the channel measurement ₀ After the initial frequency domain vectors, it may be determined in advance whether the physical uplink resources pre-allocated by the network device are sufficient. Whether the physical uplink resource is sufficient or not, specifically, whether the physical uplink resource is sufficient or not is meant to be used to transmit the indication information of the precoding matrix. In this embodiment of the present application, the indication information of the precoding matrix may specifically include indication information of a spatial vector generated based on L spatial vectors, based on M ₀ M generated from the initial frequency domain vectors ₀ Indication information of initial frequency domain vectors, transmitting antenna based on dual polarization direction, L space vectors and M ₀ Initial frequency ofThe length of the domain vector generation is 2L×M ₀ And 2K ₀ Quantization information for the non-zero coefficients. Wherein the bit overhead of the last three terms is related to the initial frequency domain vector. The L indicating information of the space vectors, M ₀ Indication information, bitmap and 2K of each initial frequency domain vector ₀ The quantization information of the non-zero coefficients is referred to as indication information of the precoding matrix, since the precoding matrix can be determined from these indication information. It should be understood that the indication information of the precoding matrix is carried in the CSI report, so that whether the above-mentioned physical uplink resources are sufficient for transmitting the indication information of the precoding matrix may be replaced by whether the physical uplink resources are sufficient for transmitting the CSI report.

It should be noted that, when the physical uplink resource is insufficient, the number of non-zero coefficients actually reported by the terminal device may be less than or equal to 2K ₀ Therefore, the terminal device may additionally indicate the reporting number of the non-zero coefficient. The indication information of the precoding matrix may also include an indication of the number of reports of the non-zero coefficient. Typically, an indication of the number of reports due to non-zero coefficients is designed in the first part of the CSI report in order for the network device to accurately estimate the length of the second part of the CSI report. Therefore, the indication of reporting the number of the non-zero coefficients needs to be reserved, and the embodiment of the application does not involve the change of the indication overhead of reporting the number of the non-zero coefficients.

The indication information of the precoding matrix described in the embodiments of the present application mainly refers to information included in the second part of the CSI report. In the second portion of CSI reporting, the total overhead of the indication information of the precoding matrix may specifically include: the overhead of indication of spatial vectors, indication of frequency domain vectors, indication of the locations of the pairs of spatial-frequency vectors selected to construct the precoding matrix (e.g., a bitmap), and quantization information for non-zero coefficients. Hereinafter, for brevity, description will not be repeated.

The terminal device may estimate the required physical uplink resources according to a predefined indication manner. Under the condition that the number of the airspace vectors is fixed, the terminal equipment is based on the M ₀ Estimating the precoding with an initial frequency domain vectorThe total overhead of the indication information of the code matrix may be predetermined.

Assume that the indication overhead of L spatial vectors is Q _S Bits, M ₀ The indication overhead of the initial frequency domain vector is Q _F Bits for indicating L spatial vectors and M ₀ The bit map of the positions of the initial frequency domain vectors is 2L×M ₀ Bit, 2K ₀ Quantization overhead of non-zero coefficients is Q _C Bits. The terminal device is based on the M ₀ The total overhead of the indication information of the precoding matrix estimated by the initial frequency domain vector is Q _L +Q _F +2L×M ₀ +Q _C Bits. For convenience of explanation, let Q ₀ ＝Q _L +Q _F +2L×M ₀ +Q _C 。

The physical uplink resources pre-allocated by the network device can be used to carry Q bits at most. Then if Q ₀ If Q is greater than zero, the physical uplink resources pre-allocated by the network device are insufficient, and the terminal device may need to discard a part of initial frequency domain vectors; if Q ₀ Q is not more than or equal to Q, the physical uplink resources pre-allocated by the network equipment are sufficient, and the terminal equipment can make M ₀ All the initial frequency domain vectors are reported without discarding. Since the specific process of reporting CSI by the terminal device in the case where the physical uplink resources pre-allocated by the network device are sufficient may be the same as that of the prior art, detailed description thereof will not be provided herein. The application mainly discusses how the terminal device selects the frequency domain vector to be reported under the condition that the physical uplink resources pre-allocated by the network device are insufficient.

In the embodiment of the application, the terminal equipment can be based on M ₀ Column priority and group priority of each of the initial frequency-domain vectors determines which initial frequency-domain vectors to discard preferentially. Details regarding the column priority and the group priority will be described later in detail in connection with the embodiments, and the detailed description of the column priority and the group priority will be omitted here for the moment.

After discarding a part of the initial frequency domain vector, if the total overhead determined based on the initial frequency domain vector which is not discarded falls within a bit range which can be carried by the physical uplink resource pre-allocated by the network device, that is, the total bit number is less than or equal to Q, the terminal device may generate the first indication information based on the initial frequency domain vector which is not discarded. These initial frequency-domain vectors that are not discarded, i.e. the frequency-domain vectors to be reported as described above.

It should be understood that after discarding a portion of the initial frequency-domain vector, the terminal device does not need to report the non-zero coefficients corresponding to the discarded portion of the initial frequency-domain vector. The terminal device may discard a portion of the initial frequency domain vector while also discarding its corresponding non-zero coefficients. The terminal device determines whether to discard a portion of the initial frequency-domain vectors and which initial frequency-domain vectors to discard, i.e. it is equivalent to the terminal device determining whether to discard a portion of the initial frequency-domain vectors and their corresponding non-zero coefficients and which initial frequency-domain vectors and their corresponding non-zero coefficients to discard. Hereinafter, for brevity, description will not be repeated.

It should also be appreciated that the above-described method of determining whether a portion of the initial frequency domain vector needs to be discarded by the terminal device is only one possible implementation and should not constitute any limitation to the present application. The specific method for determining whether to discard part of the initial frequency domain vector by the terminal device belongs to the internal implementation behavior of the terminal device and can be implemented by different algorithms. The present application is not limited in this regard.

The terminal device is based on the method described above from M ₀ After M frequency domain vectors to be reported are determined from the initial frequency domain vectors, the M frequency domain vectors can be indicated by the first indication information.

The first indication information may be used to indicate only the M frequency domain vectors, or may be used to indicate the M frequency domain vectors, the L spatial vectors, the positions of the selected spatial vector pairs, and the weighting coefficients. The present application is not limited in this regard.

When the first indication information is used to indicate M frequency domain vectors, the terminal device may indicate the frequency domain vectors by indexes of combinations of frequency domain vectors corresponding to each of the Z columns. For example, for the z-th column, through M ^z Indexing of combinations of frequency domain vectors to indicate M ^z Each frequency domain vector; the terminal equipment can also pass through M ^z Index of each frequency domain vector to indicate the M ^z And frequency domain vectors. The terminal device may further indicate the M by the first indication information when the set of frequency domain vectors is spread into a plurality of subsets by an oversampling factor ^z Index of the subset to which the individual frequency domain vectors belong.

If the first indication information is further used for indicating L spatial vectors, the terminal device may indicate the L spatial vectors by using indexes of combinations of the L spatial vectors, or may indicate the L spatial vectors by using indexes of each of the L spatial vectors. When the spatial vector set is expanded into a plurality of subsets through the oversampling factor, the terminal device can further indicate indexes of the subsets to which the L spatial vectors belong through the first indication information.

When the first indication information is used to indicate the position of the selected space-frequency vector pair, the first indication information may be indicated by a bitmap having a length of 2 lxm. The bitmap may include 2l×m indication bits corresponding to 2l×m space-frequency vector pairs. Each indication bit may be used to indicate whether the corresponding pair of space-frequency vectors is selected for constructing the precoding matrix. When the indication bit corresponding to a certain space-frequency vector pair is "1", it may indicate that the space-frequency vector pair is selected to construct a precoding matrix, and the weighting coefficient corresponding to the space-frequency vector pair is non-zero; when the indication bit corresponding to a certain space-frequency vector pair is "0", it may indicate that the space-frequency vector pair is not selected to construct the precoding matrix, and the weighting coefficient corresponding to the space-frequency vector pair is zero.

As mentioned above in the foregoing description,that is, the bitmap may include +.>And a number of bits. The bitmap corresponding to each column (or, alternatively, to each transport layer) may include 2L M ^z And a number of bits.

Therefore, it can be seen that when the number of frequency domain vectors to be reported is reduced, the length of the corresponding bitmap can also be reduced.

If the first indication information is further used for indicating a weighting coefficient, a non-zero coefficient is specifically indicated. The terminal device may indicate the non-zero coefficient, for example, by a quantized value or an index of the quantized value, and the specific indication mode of the weighting coefficient is not limited in the present application, as long as the opposite terminal can determine each non-zero coefficient according to the indication information.

Due to the predetermined K of the terminal device ₀ The non-zero coefficients include the sum M ₀ And the non-zero coefficient corresponding to each initial frequency domain vector in the initial frequency domain vectors. When M ₀ When some of the initial frequency domain vectors are discarded, the corresponding non-zero coefficients can be discarded at the same time, so that the reporting cost of the weighting coefficients can be reduced.

The specific method that the terminal device reports the spatial vector, the frequency domain vector and the weighting coefficient through the indication information can refer to the prior art, and for brevity, the description is omitted here.

It should be noted that, after discarding a part of the initial frequency domain vector and the corresponding non-zero coefficient, the total overhead of the indication information of the precoding matrix (for example, denoted as Q ', where Q' is a positive integer) may be smaller than the maximum number of bits Q that can be carried by the physical uplink resource. I.e., Q' < Q. In this case, the physical uplink resource may have a partial resource free, and the partial free resource may be used to carry a part of bits, for example, in the above example, the free resource may be used to carry Q-Q' bits. The terminal device may indicate more non-zero coefficients, which may be non-zero coefficients corresponding to the frequency domain vectors that were not discarded, through this partially free resource. Therefore, the physical uplink resource can be fully utilized, more useful information can be transmitted through the limited physical uplink resource, namely, the feedback precision can be improved by indicating more nonzero coefficients.

Therefore, under the condition that the physical uplink resources of the terminal equipment are insufficient, the cost saved by discarding a part of initial frequency domain vectors and the indication cost brought by adding and reporting a part of non-zero coefficients can be comprehensively considered. And weighing the two with the aim of obtaining higher-precision feedback, and finally determining the number M of the frequency domain vectors which are actually reported.

It should be understood that after determining the M frequency domain vectors, the terminal device indicates whether more non-zero coefficients are internal implementations of the terminal device through the free resources in the physical uplink resources, which is not limited in this application. The terminal device may not utilize the portion of the free resources to indicate the non-zero coefficient, or use the portion of the free resources for other purposes, which is not limited in this application.

In step 220, the terminal device transmits the first indication information. Correspondingly, the network device receives the first indication information.

Specifically, the first indication information may be, for example, information contained in the PMI, or may be the PMI. The first indication information may be carried in the CSI report, for example. Optionally, the first indication information is carried in a second part of the CSI report.

The CSI report may be transmitted to the network device on physical uplink resources. The physical uplink resource may be, for example, a physical uplink control channel (physical uplink control channel, PUCCH) resource or a physical uplink shared channel (physical uplink share channel, PUSCH) resource. The present application is not limited in this regard.

It should be understood that a specific procedure for the terminal device to transmit the PMI or CSI report to the network device may refer to the prior art, and a detailed description of the specific procedure is omitted herein for brevity.

In step 230, the network device determines M frequency domain vectors according to the first indication information.

The specific process of the network device determining the M frequency domain vectors according to the first indication information corresponds to the specific method of the terminal device generating the first indication information according to the M frequency domain vectors. When the network device and the terminal device agree on the indication modes of the M frequency domain vectors in advance, the two parties can generate and interpret the first indication information based on the corresponding modes.

The L space vectors reported by the terminal equipment can be used for constructing each of Z columns in the precoding matrix; m reported by terminal equipment ^z Each frequency domain vectorIs the frequency domain vector corresponding to the z-th column, K is reported by the terminal equipment ^z The number of weighting coefficients is a weighting coefficient corresponding to the Z-th column, and can be used to construct the Z-th column of the Z columns in the precoding matrix. The L spatial vectors and M corresponding to z columns ^z Sum of frequency domain vectors K ^z The weighting coefficients may be used to construct a space-frequency matrix. The space-frequency matrix is the space-frequency matrix of the z-th transport layer. The space-frequency matrix can be formed by the L space vectors and M ^z And the space-frequency component matrix constructed by the frequency domain vectors is obtained by weighted summation. Whereby precoding vectors for one or more frequency domain units on the z-th transmission layer can be derived.

Thereafter, the network device may be based on the nth (1N N) on each transport layer ₃ And n is an integer) the precoding vector determined by the n frequency domain units may construct a precoding matrix corresponding to the n-th frequency domain unit. For example, precoding vectors corresponding to the nth frequency domain unit are sequentially arranged in the order from the 1 st transmission layer to the Z-th transmission layer in the Z-th transmission layers, and normalization processing is performed, so that a precoding matrix corresponding to the nth frequency domain unit can be obtained.

It should be understood that the above method for determining the precoding vector corresponding to each frequency domain unit on each transmission layer based on the spatial vector, the frequency domain vector and the weighting coefficient indicated by the first indication information, and further determining the precoding matrix corresponding to each frequency domain unit is merely an example, and should not be construed as limiting the present application. The specific method for determining the precoding matrix by the network equipment based on the spatial vector, the frequency domain vector and the weighting coefficient is not limited.

Based on the above method, the terminal device may select a portion of the initial frequency domain vectors with higher priority to report based on the column priority and the group priority of the initial frequency domain vectors, and discard the initial frequency domain vectors with lower priority. Meanwhile, as the weighting coefficient corresponds to the space-frequency vector pair, a part of initial frequency domain vectors with lower priority are discarded, and meanwhile, the weighting coefficient corresponding to the part of initial frequency domain vectors with lower priority is discarded together. Thus, feedback overhead can be reduced from at least two dimensions of the position of the weighting coefficients and quantization information. In some cases, the indication overhead of the frequency domain vector may be further reduced. In addition, since the discarded initial frequency domain vector is an initial frequency domain vector with lower priority and has a corresponding relation with the weighting coefficient, the limited physical uplink resource can be used to report the CSI to a greater extent, and the influence on the feedback precision is smaller. I.e. a high compromise efficiency is obtained between feedback accuracy and feedback overhead.

And, since the total overhead required after discarding a portion of the initial frequency domain vector may be less than the maximum number of bits that can be carried by the physical uplink resources pre-allocated by the network device. This partially free resource may be used to indicate more non-zero coefficients corresponding to the frequency domain vector that was not discarded. Therefore, physical uplink resources can be fully utilized, and the feedback precision is improved.

When the frequency domain vector corresponding to each transmission layer reported by the terminal device is indicated by the index corresponding to the combination of the plurality of frequency domain vectors, the network device needs to determine in advance the number of the frequency domain vectors corresponding to each transmission layer reported by the terminal device, and further determine the frequency domain vector corresponding to each transmission layer according to the index. In this case, the terminal device may report M frequency domain vectors and indicate the number of reported frequency domain vectors corresponding to each transmission layer, or the network device may infer the number of reported frequency domain vectors corresponding to each transmission layer according to the indication overhead corresponding to each priority (for example, as shown in table 9-a below) and other information that is known in advance, such as the number of reported non-zero coefficients, the maximum number of bits Q that can be carried by the physical uplink resource, and the like.

The terminal device M-based will be described in detail below in connection with specific embodiments ₀ The column priority and the group priority of the initial frequency domain vectors determine a specific process of M frequency domain vectors to be reported and the network equipment determines a specific process of M frequency domain vectors according to the first indication information.

After determining that the physical uplink resources are insufficient, the terminal device can determine M from the prior based on channel measurement ₀ Each initial frequency domain directionA portion of the initial frequency domain vector is discarded in the amount. The terminal equipment can be based on M ₀ Column priority and group priority of the individual initial frequency-domain vectors to determine which initial frequency-domain vectors to discard.

In the embodiment of the present application, for the Z columns, among the initial frequency-domain vectors corresponding to the Z columns, the initial frequency-domain vector corresponding to each column may correspond to one column priority. Optionally, the column priorities of the Z columns are different from each other. For example, Z columns may correspond to Z column priorities. The Z column priorities may include, for example, a first column priority to a Z-th column priority in descending order of priority.

In one possible implementation, the column priority of the Z columns decreases with increasing sequence number of the corresponding transport layer.

For example, for Z transport layers, the column priority corresponding to the 1 st transport layer is highest and the column priority corresponding to the Z transport layer is lowest. The column priority is decremented from the 1 st transport layer to the Z-th transport layer.

In another possible implementation, the column priority of the Z columns may be determined from a predefined plurality of column prioritization. Each rank of the plurality of rank priorities may represent a rank of the plurality of rank priorities. The terminal device may select a column prioritization by itself.

The terminal device may also indicate the selected prioritization to the network device by signaling. Optionally, the method 200 further comprises: the terminal device transmits second indication information for indicating column priority ordering of the Z columns. Correspondingly, the network device receives second indication information, which is used for indicating the column priority ordering of the Z columns.

The terminal device may, for example, indicate the priority ranking to the network device via the corresponding index, so that the network device determines the priority ranking selected by the terminal device according to the index. Wherein, a plurality of priority orders are in one-to-one correspondence with a plurality of indexes. The correspondence of the plurality of prioritization and the plurality of indexes may be predefined, for example, as defined by a protocol. The correspondence between the priority orders and the indexes is not limited.

Table 1 shows an example of the correspondence between the column priority order and the index of the Z columns. Assuming Z is 4 in table 1, there are a number of possible orders for the column priority of the 4 columns. As shown in table 1:

TABLE 1

Index	Column prioritization (high to low)
		0	Column 1, column 2, column 3, column 4
1	Column 1, column 3, column 2, column 4
		2	Column 1, column 4, column 2, column 3
3	Column 1, column 3, column 4, column 2
		4	Column 1, column 4, column 3, column 2
……	……

It should be understood that when Z is 4, there may be more possible ordering of the column priorities corresponding to the 4 columns, and table 1 shows only a portion of which for ease of understanding and should not constitute any limitation to the present application. In addition, Z is 4 and is only an example, and should not be construed as limiting the present application. The value of Z is not limited in this application.

The initial frequency-domain vector for each column may include one or more sets of initial frequency-domain vectors, or alternatively, the initial frequency-domain vector for each column may be divided into one or more sets of initial frequency-domain vectors. Each set of initial frequency domain vectors may correspond to a set of priorities.

Optionally, when the initial frequency-domain vectors corresponding to each column include a plurality of sets of frequency-domain vectors, the set priorities of the plurality of sets of initial frequency-domain vectors are different from each other.

That is, the initial frequency domain vectors for each column may be divided into groups, each group corresponding to a group priority.

In one implementation, the terminal devices may be grouped according to the strength of the initial frequency domain vector.

In connection with the strength of the initial frequency domain vector, a number of possible grouping rules are listed below.

For example, when an initial frequency-domain vector corresponding to a certain column is divided into two groups, the terminal devices may be grouped according to the intensity of the initial frequency-domain vector. For example, the first and second sets of initial frequency domain vectors may be sequentially separated in order of decreasing intensity. Wherein the first set of initial frequency-domain vectors may comprise a portion of the initial frequency-domain vectors that are stronger and the second set of initial frequency-domain vectors may comprise another portion of the initial frequency-domain vectors that are weaker. The number of initial frequency domain vectors per set may be predefined. For example, the number of initial frequency domain vectors corresponding to the z-th column isWherein the number of the first set of initial frequency domain vectors isThe number of the second set of initial frequency domain vectors is +.>Or->Alternatively, the number of the first set of initial frequency domain vectors is +.>The number of the second set of initial frequency domain vectors is +.>Or->It should be understood that the number of the devices,and->Equivalent to each other, < > >And->Both are also equivalent.

For example, if the number of initial frequency-domain vectors corresponding to a certain column is 8, and the initial frequency-domain vectors are divided into a first group of initial frequency-domain vectors and a second group of initial frequency-domain vectors according to the descending order of intensity, the number of the first group of initial frequency-domain vectors is 4, and the number of the second group of initial frequency-domain vectors is 4. For another example, if 7 initial frequency-domain vectors corresponding to a certain column are divided into a first group of initial frequency-domain vectors and a second group of initial frequency-domain vectors according to the descending order of intensity, the number of the first group of initial frequency-domain vectors is 4, the number of the second group of initial frequency-domain vectors is 3, or the number of the first group of initial frequency-domain vectors is 3, and the number of the second group of initial frequency-domain vectors is 4.

For another example, when the initial frequency domain vectors corresponding to a certain column are divided into three groups, the terminal device may rootGrouping is based on the strength of the initial frequency domain vector. For example, the first, second and third sets of initial frequency domain vectors may be sequentially separated in order of decreasing intensity. Wherein the first set of initial frequency-domain vectors comprises a portion of the initial frequency-domain vectors that are stronger, the second set of initial frequency-domain vectors may comprise a portion of the initial frequency-domain vectors that are of intermediate strength, and the third set of initial vectors may comprise a portion of the initial frequency-domain vectors that are weaker. The number of initial frequency domain vectors per set may be predefined. For example, the number of initial frequency domain vectors corresponding to the z-th column is Wherein the number of the first set of initial frequency domain vectors is +.>The number of the second set of initial frequency domain vectors is +.>The number of the third set of initial frequency domain vectors is +.>Alternatively, the number of the first set of initial frequency domain vectors is +.>The number of the second set of initial frequency domain vectors is +.>The number of the third set of initial frequency domain vectors is +.>/>

Thus, when the initial frequency-domain vectors corresponding to a certain column are divided into N groups, the terminal devices may be grouped according to the intensity of the initial frequency-domain vectors. For example, the first set, the second set, and the nth set of initial frequency domain vectors may be sequentially divided in order of decreasing intensity. Wherein the first set of initial frequency domain vectors may include stronger strengthThe N-th set of initial frequency-domain vectors may include a portion of the initial frequency-domain vectors having weaker intensities, and the second through N-1-th sets of initial frequency-domain vectors may each include a portion of the initial frequency-domain vectors having intensities between the first and N-th sets. For example, the number of initial frequency domain vectors corresponding to the z-th column isWherein the number of the first set of initial frequency domain vectors may be +.>The number of the N-th set of initial frequency domain vectors may be +.>Each of the remaining N-2 sets of initial frequency-domain vectors comprises a portion of the initial frequency-domain vectors having an intensity between the first set and the nth set, the number of each set of initial frequency-domain vectors may be + >Alternatively, the number of the first set of initial frequency domain vectors may be +.>The number of the N-th set of initial frequency domain vectors may be +.>Each of the remaining N-2 sets of initial frequency-domain vectors includes a portion of the initial frequency-domain vectors having an intensity between the first and nth sets, the number of initial frequency-domain vectors in each set may be

It should be noted that "stronger", "weaker", etc. as described herein may be measured by, for example, the magnitude of the frequency domain vector. In one implementation, the initial frequency-domain vectors corresponding to each column may be grouped according to the magnitude relationship of the magnitudes of the weighting coefficients corresponding to each initial frequency-domain vector.

For example, the z-th column in the precoding matrix may be formed by L spatial vectors andthe L frequency domain vectors are constructed and obtained, and the L spatial vectors are combined with +>The combination of the initial frequency-domain vectors>The space-frequency vector pair of the individual can be equal to +.>The weighting coefficients correspond. This->The weighting coefficients can be expressed as dimension +.>Is a matrix of (a) in the matrix. Each element in the matrix corresponds to a space-frequency vector pair and is a weighting coefficient of the corresponding space-frequency vector pair. Each column in the matrix may correspond to L spatial vectors and one frequency domain vector, or L space-frequency vector pairs obtained by combining L spatial vectors and one frequency domain vector. Therefore, the squares of the modes of the weighting coefficients in the same column are summed to obtain the amplitude of the initial frequency domain vector corresponding to the weighting coefficient in the column. Will- >Sum of squares of the modes of the weighting coefficients of the individual columns, can be obtained +.>The magnitudes of the initial frequency-domain vectors. Based on the->The magnitude of the magnitudes of the initial frequency-domain vectors may determine the strength relationship of the initial frequency-domain vectors.

It should be understood that the relationship of magnitude of the weighting coefficients corresponding to the frequency domain vectors is only one possible implementation, and should not be construed as limiting the application. The grouping mode of the frequency domain vectors is not limited in the present application.

It should also be understood that the embodiments of the present application are described using the expression grouping the initial frequency domain vectors for ease of understanding only, and this should not constitute any limitation to the present application. The terminal device does not necessarily perform the grouping action in determining one or more sets of initial frequency domain vectors in each column.

As can be seen from the above description of column priorities and group priorities, each initial frequency domain vector is defined with one column priority and one group priority.

Thus the M frequency domain vectors may be based on M ₀ The group priority and column priority of each of the initial frequency-domain vectors. Alternatively, the terminal device may be based on M ₀ And determining M frequency domain vectors to be reported according to the column priority and the group priority of each initial frequency domain vector.

Several examples of ordering the initial frequency domain vectors based on column priority and group priority are given below.

It is assumed that the initial frequency-domain vectors corresponding to the Z columns decrease with increasing sequence numbers of the corresponding transmission layers, and each of the initial frequency-domain vectors corresponding to the columns may be divided into two groups, for example, the initial frequency-domain vector corresponding to each column may include a first group of initial frequency-domain vectors and a second group of initial frequency-domain vectors, and the group priority of the first group of initial frequency-domain vectors is higher than the group priority of the second group of initial frequency-domain vectors. The prioritization of the initial frequency domain vectors for the Z columns may be obtained as shown in table 2 below.

TABLE 2

In the table, the priority of the initial frequency domain vector is sequentially decreased from top to bottom. That is, from priority 1 to priority 2Z, the priorities are sequentially decreased.

It should be understood that table 2 only shows an example in which the initial frequency domain vectors are arranged in order of priority from high to low, and should not be construed as limiting the present application. More specific examples are given below.

Assuming that Z is 4,Z, each of the columns may be divided into two sets, e.g., each of the columns may include a first set of initial frequency-domain vectors and a second set of initial frequency-domain vectors. A number of possible prioritization of the initial frequency domain vectors for the 4 columns may be obtained as shown in tables 3 to 6 below. The priorities of the initial frequency domain vectors shown in tables 3 to 6 are sequentially decreased in the order from top to bottom. I.e. the first row has the highest priority and the last row has the lowest priority.

TABLE 3 Table 3

TABLE 4 Table 4

TABLE 5

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TABLE 6

It should be noted that the above is only an example, showing a number of possible prioritization with Z of 4. But this does not mean that these prioritisation are only used in case of rank 4. When the rank is less than 4, the prioritization listed above may also be used. As long as the priority corresponding to the initial frequency domain vector of the partial column is ignored. For example, if Z is 3, the priority corresponding to the initial frequency domain vector corresponding to column 4 may be ignored. Taking table 3 above as an example, the "priority 4" in the table may be: a first set of initial frequency-domain vectors, and priority 8, of the initial frequency-domain vectors corresponding to column 4: the second set of initial frequency domain vectors corresponding to column 4 are ignored, and the other rows in the table are still arranged according to the original sequence, so that the priority ranking when Z is 3 can be obtained.

It should be understood that the foregoing is merely illustrative of a few possible prioritization schemes for understanding, and that this should not constitute any limitation to this application. As long as the initial frequency domain vectors corresponding to the columns are ordered according to the column priorities, the groups of initial frequency domain vectors in each column are ordered according to the group priorities, and the obtained priority ordering should fall within the protection scope of the present application.

It should also be appreciated that the assumption that Z is 4 above and that the initial frequency domain vectors for each column are divided into two groups is merely an example and should not constitute any limitation to the present application. The value of Z is not limited in this application, and the group number included in the initial frequency domain vector corresponding to each column is not limited.

It should also be appreciated that the column priorities of the 4 columns shown above are defined in such a way that the column priorities of the 4 columns are decremented in a manner that the sequence numbers of the transport layers are incremented. But this should not constitute any limitation to the present application. Based on the method described above, the terminal device may also select one sort from a predefined plurality of column priority sorts. Such as a certain priority ranking as shown in table 1 above, or other possible ranking. For brevity, no one-to-one illustration is provided herein.

As an optional embodiment, the initial frequency domain vectors corresponding to the Z columns in the precoding matrix include T sets of initial frequency domain vectors corresponding to T sets of group priorities, and the initial frequency domain vectors corresponding to each column belong to one or more sets of the T sets of initial frequency domain vectors in order of from high to low of the group priorities; and, the same set of initial frequency-domain vectors includes initial frequency-domain vectors corresponding to one or more of the Z column priorities.

That is, M corresponding to Z columns ₀ The total of the initial frequency domain vectors may be divided into T groups, each of which may correspond to a group priority, and the group priorities of the T groups of initial frequency domain vectors are different from each other. That is, the T sets of initial frequency domain vectors may be ordered in order of higher to lower set priority. Further, each set of initial frequency-domain vectors may include initial frequency-domain vectors corresponding to one or more columns. The initial frequency-domain vector corresponding to the one or more columns may correspond to the initial frequency-domain vector of the one or more column priorities. That is, when the initial frequency-domain vectors classified into the same set of initial frequency-domain vectors include a plurality of columns of initial frequency-domain vectors, the initial frequency-domain vectors of the plurality of columns of the same set of initial frequency-domain vectors may be ordered in order of column priority from high to low.

For example, assuming that Z is 4, the initial frequency-domain vectors corresponding to each column may be divided into two sets of initial frequency-domain vectors. Wherein, a first group of initial frequency domain vectors in the initial frequency domain vectors corresponding to each of the 4 columns may correspond to the same group of priorities, for example, the first group of priorities is referred to as a first group of priorities; a second set of initial frequency-domain vectors of the initial frequency-domain vectors corresponding to each of the 4 columns may correspond to another set of priorities, e.g., denoted as a second set of priorities. Therefore, the initial frequency domain vectors corresponding to the 4 columns include two sets of initial frequency domain vectors, and the initial frequency domain vectors correspond to the two sets of priorities respectively.

Wherein the first set of initial frequency-domain vectors has a higher priority than the second set of initial frequency-domain vectors. Alternatively, the first set of priorities is higher than the second set of priorities. The first set of priorities may also be referred to as a high set of priorities and the second set of priorities may also be referred to as a low set of priorities.

Furthermore, the column priority of 4 columns may be defined in the manner described above. For example, the column priority of the initial frequency domain vector corresponding to the Z columns is decremented according to the sequence number increment of the corresponding transport layer. The prioritization from which the 4 columns corresponding initial frequency domain vectors can be obtained can be as shown in table 3 above. That is, according to the group priority and the column priority, the initial frequency domain vectors corresponding to the 4 columns may be divided into 8 priorities in total. Specifically, a first set of initial frequency-domain vectors among the initial frequency-domain vectors corresponding to the 1 st column through the 4 th column may correspond to the same set of priorities, as described above, and the initial frequency-domain vectors of the first set of priorities may correspond to the 4 column priorities; a second set of initial frequency-domain vectors of the initial frequency-domain vectors corresponding to the 1 st column through the 4 th column may correspond to another set of priorities, such as the second set of priorities described above, and the initial frequency-domain vectors of the second set of priorities may also correspond to the 4 column priorities.

Table 2 is a more general form of table 3. That is, the initial frequency domain vectors corresponding to the Z columns are divided into 2Z priorities in total. Specifically, a first set of initial frequency-domain vectors among the initial frequency-domain vectors corresponding to the 1 st column through the Z-th column may correspond to the same set of priorities, as described above, and the initial frequency-domain vectors of the first set of priorities may correspond to the Z-column priorities; a second set of initial frequency-domain vectors of the initial frequency-domain vectors corresponding to the 1 st column through the Z-th column may correspond to another set of priorities, such as the second set of priorities described above, and the initial frequency-domain vectors of the second set of priorities may also correspond to the Z-column priorities.

It should be understood that the prioritization of the initial frequency domain vectors shown in table 2 is only an example. As previously described, the column priority of the Z columns may be a selected one of a predefined plurality of column prioritization. That is, the column prioritization of the Z columns is not limited to decrementing by increasing the number of transport layers as shown in table 2.

Based on the different column prioritization, table 2 may also be presented in a more general form, particularly as shown in table 7, with more possible values of column priorities and more possible values of group priorities.

TABLE 7

Wherein, the p ₁ The column indicates the column with the highest column priority, p _Z The column with the lowest column priority is the column with the p-th column priority ₁ Column number to p _Z The columns decrease sequentially. And the first group of initial frequency domain vectors represents the group with the highest group priority, the N group of initial frequency domain vectors represents the group with the lowest group priority, and the group priorities are sequentially decreased from the first group of initial frequency domain vectors to the N group of initial frequency domain vectors.

If T is 2, table 7 may be modified to be shown in table 8:

TABLE 8

It should be understood that the prioritization of the initial frequency domain vectors described above in connection with tables 2 and 8 is only an example and should not constitute any limitation to the present application. For example, it is not necessary that each column corresponds to an initial frequency domain vector corresponding to T group priorities. For example, when the number of initial frequency domain vectors corresponding to a certain column is small, only part of the N group priorities may be used.

Further, possible implementations are listed above with respect to the manner of determination of the sets of initial frequency domain vectors. For example, when T is 2, table 3 may be derived as shown in tables 9 to 12.

TABLE 9

Table 10

TABLE 11

Table 12

For another example, Z is 4, and the initial frequency-domain vectors corresponding to each column may be divided into three sets of initial frequency-domain vectors. Wherein, a first group of initial frequency domain vectors in the initial frequency domain vectors corresponding to each of the 4 columns may correspond to the same group of priorities, for example, the first group of priorities is referred to as a first group of priorities; a second set of initial frequency-domain vectors of the initial frequency-domain vectors corresponding to each of the 4 columns may correspond to another set of priorities, e.g., denoted as a second set of priorities; a third set of initial frequency-domain vectors of the initial frequency-domain vectors corresponding to each of the 4 columns may correspond to a further set of priorities, e.g. denoted as a third set of priorities. Therefore, the initial frequency domain vectors corresponding to the 4 columns include three sets of initial frequency domain vectors, which correspond to the three sets of priorities, respectively.

Wherein the first set of initial frequency-domain vectors has a higher priority than the second set of initial frequency-domain vectors, and the second set of initial frequency-domain vectors has a higher priority than the third set of initial frequency-domain vectors. Alternatively, the first set of priorities is higher than the second set of priorities, which is higher than the third set of priorities. The first set of priorities may also be referred to as the highest set of priorities, the second set of priorities may also be referred to as the higher set of priorities, the third set of priorities and may be referred to as the lowest set of priorities.

When T is 3, table 7 may be derived as shown in tables 13 to 16.

TABLE 13

TABLE 14

TABLE 15

Table 16

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Wherein, the p ₁ The column indicates the column with the highest column priority, p ₄ The column with the lowest column priority is the column with the p-th column priority ₁ Column number to p ₄ The columns decrease sequentially.

It should be appreciated that the above list of a number of possible prioritization of the initial frequency domain vectors in connection with tables 1 to 16 is for ease of understanding only. These examples are merely examples and should not be construed as limiting the present application in any way.

It should also be appreciated that the prioritization of the initial frequency domain vectors is not limited to being represented by the tabular manner shown above, but may be represented by other manners, which are not limited in this application.

After the terminal device determines the priority ordering of the initial frequency domain vectors, a part of initial frequency domain vectors can be sequentially discarded according to the order of the priority from low to high under the condition of insufficient physical uplink resources.

Take the prioritization shown in table 9 as an example. If the terminal equipment determines that the physical uplink resource is insufficient, the terminal equipment can consider M determined by the terminal equipment ₀ Some of the initial frequency-domain vectors are discarded. The terminal device may first consider weaker ones of the initial frequency domain vectors corresponding to column 4 as set forth in the last row of table 9The individual initial frequency domain vectors are discarded. If the physical uplink resources are still insufficient, the terminal device may further consider weaker ++ ->The individual initial frequency domain vectors are discarded. And so on, the terminal device may discard the initial frequency domain vectors sequentially from the last row to the first row until the physical uplink resources pre-allocated by the network device are enough to report the remaining frequency domain vectors that are not discarded.

In one implementation, the terminal device may pre-estimate the total overhead required to indicate the precoding matrix based on the bit overhead corresponding to the initial frequency domain vector for each priority. As described above, the overhead of the terminal device for indicating the precoding matrix is the indication bit of the spatial vector, the indication bit of the frequency domain vector, the bitmap length, and the quantization bit of the non-zero coefficient. Wherein, besides the indication bit Q of the space vector _S After L is fixed, no change occurs, and other terms may change as the number of discarded frequency domain vectors changes. For example, the length of the bitmap may be defined by frequencies that are not discardedThe number of the domain vectors (namely, the number M of the frequency domain vectors which are actually reported) is determined; the indication bits of the frequency domain vector are related to the number M of initial frequency domain vectors that have not been discarded. Because each value of M can correspond to the correspondence between the combination of a plurality of frequency domain vectors and the index, when the value of M changes, the number of bits of the index for indicating the combination of M frequency domain vectors may change or may not change; the quantized bits of the non-zero coefficients are also associated with the non-discarded frequency domain vector, and after discarding a portion of the initial frequency domain vector, the non-zero coefficients corresponding to the discarded initial frequency domain vector may be discarded accordingly, and the quantization overhead of the non-zero coefficients may be reduced accordingly.

The terminal device may estimate the indicated overhead required after discarding the initial frequency domain vector corresponding to each priority according to the above calculation formula for the total overhead. And determining M frequency domain vectors which can be reported through the first indication information by the discarded initial frequency domain vectors when determining that the required indication overhead is smaller than or equal to the maximum overhead (namely, the Q bits) which can be borne by the physical uplink resource pre-allocated by the network equipment. Specifically, since the terminal device may determine in advance the bit overhead corresponding to each discarded one priority of the initial frequency domain vectors after determining the priority ordering of the respective initial frequency domain vectors. For example, each row in the prioritization shown in table 8 above may correspond to a bit overhead, as shown in table 9-a.

TABLE 9-a

The indication overhead corresponding to each row specifically refers to the sum of the indication overhead for the frequency domain vector and the overhead of the bitmap after discarding the initial frequency domain vectors corresponding to all rows below the row. Or, to this end, the sum of the indication overhead and the bitmap overhead required by the frequency domain vector. It will be appreciated that Q _F1 To Q _F8 Are integers.

For example, Q _F7 In particular to discardWeaker of the initial frequency domain vectors corresponding to column 4After the initial frequency domain vector, the sum of the indication overhead and the bitmap overhead for the frequency domain vector. Also for example, Q _F4 Specifically, the weaker ++of the initial frequency domain vectors corresponding to column 1 are discarded>Weaker ones of the initial frequency-domain vectors corresponding to column 2>Weaker ones of the initial frequency-domain vectors corresponding to column 3>The weaker of the initial frequency-domain vectors corresponding to column 4>After the initial frequency domain vector, the sum of the indication overhead and the bitmap overhead for the frequency domain vector. For brevity, no one-to-one illustration is provided herein.

For convenience of explanation, the sum of the indication overhead of the frequency domain vector corresponding to a certain line and the overhead of the bitmap is simply referred to as the indication overhead corresponding to the priority of the line. It should be understood that the bit overhead does not contain only an indication overhead for indicating the frequency domain vector to which the row corresponds. For brevity, the description of the same or similar cases is omitted below.

It can be understood that when the number of the initial frequency domain vectors corresponding to a certain priority is zero, the indication overhead corresponding to the priority is the same as the indication overhead corresponding to the previous priority; otherwise, the indication overhead corresponding to the previous priority is larger than the indication overhead corresponding to the next priority.

For example, when Q _F1 ＞Q _F2 When the expression is aligned with column 1The number of stronger initial frequency domain vectors in the corresponding initial frequency domain vectors is not zero, and the number of stronger initial frequency domain vectors in the initial frequency domain vectors corresponding to the 2 nd column is also not zero; when Q is _F7 ＝Q _F8 In this case, the number of weaker initial frequency-domain vectors out of the initial frequency-domain vectors corresponding to column 3 is zero.

Namely Q _F1 To Q _F8 The method meets the following conditions: q (Q) _F1 ≥Q _F2 ≥Q _F3 ≥Q _F4 ≥Q _F5 ≥Q _F6 ≥Q _F7 ≥Q _F8 。

Since the priority order of the initial frequency-domain vectors shown in table 9-a is ordered in accordance with the column priority and the group priority of each initial frequency-domain vector, when the initial frequency-domain vectors are discarded in the order of the priorities shown in table 9-a from low to high, the discarding is also based on the order of the column priority and the group priority of each initial frequency-domain vector. In other words, the M frequency domain vectors indicated by the first indication information described above are based on M ₀ The column priority and the group priority of each of the initial frequency-domain vectors are determined, or the M frequency-domain vectors indicated by the first indication information are determined from M based on the column priority and the group priority of each of the initial frequency-domain vectors ₀ Selected from the initial frequency domain vectors.

In another implementation, the terminal device can self-determine from M according to the group priority and column priority of each initial frequency domain vector ₀ And selecting M frequency domain vectors from the initial frequency domain vectors to report. In this case, the network device and the terminal device do not need to negotiate the column priority ordering in advance. The terminal device may report the discarded initial frequency domain vector to the network device.

The above enumerates the terminal devices from M ₀ Possible implementations of selecting M frequency domain vectors from the initial frequency domain vectors are shown for ease of understanding only and should not constitute any limitation to the present application.

For example, the terminal device may increase the number of reports of the non-zero coefficient while discarding the initial frequency domain vector according to the bit overhead corresponding to each priority and the maximum number of bits Q that can be carried by the physical uplink resource pre-allocated by the network device. Still taking table 9-a as an example, the terminal device may determine in advance whether the indication overhead of the indication information of the precoding matrix is smaller than Q after discarding the initial frequency domain vectors with different priorities and the non-zero coefficients corresponding to the initial frequency domain vectors, and further consider the overhead that needs to be increased when the number of reports of the non-zero coefficients is increased if the indication overhead is smaller than Q. The terminal device can trade-off between the initial frequency domain vectors discarded by different priorities and the indication overhead reduced by the corresponding non-zero coefficients and the indication overhead increased by the reporting number of the increased non-zero coefficients, and from the perspective of obtaining higher feedback precision, determine which initial frequency domain vectors of the priorities and the corresponding non-zero coefficients are discarded, and determine the reporting number of the increased non-zero coefficients.

It can be understood that the non-zero coefficient of the increased report of the terminal device is the maximum report number 2K originally based on the non-zero coefficient ₀ And the non-zero coefficient with stronger intensity in the deleted part of non-zero coefficient. Such as non-zero coefficients of greater magnitude. It should be understood that, based on the maximum number of bits Q that can be carried by the pre-allocated physical uplink resource, the specific process of discarding a portion of the initial frequency domain vector and adding a portion of the non-zero coefficients to finally determine the M actually reported frequency domain vectors and the non-zero coefficients of a portion of the frequency domain vectors in the M frequency domain vectors belongs to the internal implementation behavior of the terminal device. And this way only one possible implementation of determining the M frequency domain vectors to be reported for the terminal device should not constitute any limitation to the present application.

In some possible implementations, the initial frequency domain vectors corresponding to respective columns having the same set of priorities may correspond to one or more column priorities.

Alternatively, the initial frequency domain vectors corresponding to the columns having the highest set of priorities may correspond to the same column priority.

For example, in table 2 above, the initial frequency-domain vectors of the first Z rows are all the first set of initial frequency-domain vectors, and the corresponding set of priorities is the highest set of priorities. The initial frequency-domain vectors corresponding to the 1 st column, the 2 nd column and the Z-th column in the first set of initial frequency-domain vectors may correspond to the same column priority. In this case, the first Z rows in table 2 may be combined into 1 row. As shown in table 17.

TABLE 17

Correspondingly, the first 4 rows in table 3 may be combined into 1 row, corresponding to the same priority.

TABLE 18

It should be understood that in tables 7 to 16 above, the initial frequency-domain vectors of the first Z rows are all the first set of initial frequency-domain vectors, and the corresponding set of priorities is the highest set of priorities. The initial frequency-domain vectors corresponding to columns 1, 2 and Z of the first set of initial frequency-domain vectors may correspond to the same column priority, in which case the first Z rows in tables 7-16 may be combined into 1 row, corresponding to the same priority. For brevity, a list is not described here.

For another example, the first Z rows in table 2 above may be combined into 1 row, and the last Z rows may be combined into 1 row. As shown in table 19.

TABLE 19

Correspondingly, the first 4 rows in table 3 may be combined into 1 row, corresponding to the same priority; the last 4 rows may also be combined into 1 row, corresponding to the same priority.

Table 20

It should be noted that, if the initial frequency domain vectors corresponding to the Z columns are classified into T groups according to the group priorities, the initial frequency domain vectors in each group correspond to the same priority, and the protocol may not define the priority ranks. When the terminal equipment determines that the physical uplink resources are insufficient, the p value for determining the maximum reporting number of the frequency domain vector corresponding to each transmission layer can be directly adjusted. For example, the value of p is adjusted to 1/T of the value preconfigured by the network device. For example, when T is 2, the p value preconfigured by the network device is halved.

It should be understood that in tables 7 to 16 above, the initial frequency-domain vectors of the first Z rows are all the first set of initial frequency-domain vectors, and the corresponding set of priorities is the highest set of priorities. The initial frequency-domain vectors corresponding to the 1 st column, the 2 nd column and the Z-th column in the first set of initial frequency-domain vectors may correspond to the same column priority. In this case, the first Z rows in tables 7 to 16 may be combined into 1 row, corresponding to the same priority. The initial vectors of the Z+1st row to the 2Z nd row are the second set of initial frequency domain vectors, and the corresponding set of priorities are the higher set of priorities. The initial frequency-domain vectors corresponding to the 1 st column, the 2 nd column and the Z th column in the second set of initial frequency-domain vectors may correspond to the same column priority. In this case, the z+1st to 2 nd rows in tables 7 to 16 may be combined into 1 row, corresponding to the same priority. And so on, the initial frequency domain vectors corresponding to the 1 st column, the 2 nd column and the Z th column in the same group of initial frequency domain vectors can correspond to the same column priority, and the corresponding Z rows can be combined into one row to correspond to one priority. For brevity, a list is not described here.

Alternatively, in each column having the same set of priorities, at least two columns of the initial frequency domain vectors corresponding to the same column of priorities may be used.

For example, the initial frequency domain vector corresponding to Z columns having the same set of priorities may correspond to Z '(Z' being a positive integer) column priorities. Wherein Z > Z'.

For example, the last 4 rows in table 18 above may be combined into 1 row, 2 rows, or 3 rows. Table 21 shows an example of merging the last 4 rows of table 18 into 2 rows.

Table 21

As another example, the first 4 rows in table 18 may be combined into 1 row, 2 rows, or 3 rows, and the last 4 rows may be combined into 1 row, 2 rows, or 3 rows. Table 22 shows an example of merging the first 4 rows into 2 rows and the last 4 rows into 2 rows in table 18.

Table 22

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It should be understood that the above list of priority combinations of initial frequency domain vectors for partial columns is merely exemplary and should not be construed as limiting the application in any way. For example, only the 5 th row and the 6 th row in the table 18 may be combined into one row, corresponding to the same column priority, or corresponding to the same priority; the 7 th row and the 8 th row are respectively two independent rows and correspond to different column priorities or different priorities.

It should also be appreciated that table 18 is given as an example for ease of understanding only, and the case where the initial frequency domain vectors corresponding to a plurality of columns correspond to the same column priority is described above, but this should not constitute any limitation to the present application. The various tables listed above may all be treated identically based on the same concepts and are not illustrated here for brevity.

It should also be appreciated that the prioritization of the initial frequency-domain vectors is exemplified above by way of a table, but this is only one possible manifestation of the prioritization of the initial frequency-domain vectors and should not constitute any limitation to the present application. The present application is not limited to a particular form of prioritization that represents the initial frequency-domain vector.

In some possible implementations, the first indication information is used to indicate M frequency domain vectors to be reported, where the M frequency domain vectors are selected from M ₀ Determined from the initial frequency domain vectors. The M is ₀ The initial frequency-domain vectors include T groups, each of which may includeOne or more of the Z columns corresponds to an initial frequency domain vector. The initial frequency domain vector for each group corresponds to a group priority. The group priorities corresponding to the T groups of initial frequency domain vectors are different from each other.

Each group may include an initial frequency domain vector corresponding to one or more column priorities. Alternatively, some or all of the columns in the plurality of columns corresponding to the same set of initial frequency domain vectors may have the same column priority. Such as shown in table 17 and table 22, for example. Optionally, among a plurality of columns corresponding to the same set of initial frequency domain vectors, column priorities of the columns are different from each other. Such as shown in tables 2-16, for example.

In some possible implementations, M is as described above ₀ The priority of the initial frequency domain vectors may be predefined, for example. For example, when Z is 4 and T is 2, M ₀ The prioritization of the individual initial frequency domain vectors may be as shown in tables 23 to 25.

Table 23

Table 24

Table 25

In a similar manner, the tables listed above may also be modified as shown in tables 23 to 25. For brevity, this is not a list.

In one possible design, the first indication information is carried in a second portion of the CSI report.

It should be noted that, in order to facilitate understanding, the above plural possibilities of the priority ordering of the initial frequency domain vectors are shown by plural tables, but this does not represent that the terminal device indicates M frequency domain vectors in accordance with the priority ordering when generating the first indication information.

When the terminal device generates the first indication information, the terminal device may generate indication information of the corresponding frequency domain vector based on each layer. For example, for the z-th layer, the number of frequency domain vectors actually reported by the terminal device is M ^z The terminal device can pass through the M ^z Index corresponding to the combination of the frequency domain vectors to indicate the M ^z And frequency domain vectors. Even if the M ^z The frequency domain vectors are classified into two or more different priorities, but this should not be applied to the M ^z The indication information of the individual frequency domain vectors has any influence.

As previously described, the length of the second portion of the CSI report may be determined based on the first portion of the CSI report. After determining the length of the second part of the CSI report, the terminal device can decode correctly to parse out the information in the second part of the CSI report. Thereby determining the M frequency domain vectors.

The specific procedure by which the network device determines the length of the second portion of the CSI report is described in detail below. It is to be appreciated that the network device determining the length of the second portion of the CSI report may be performed prior to step 230 described above. Specifically, the first portion of the CSI report may include an indication of the RI and the number of non-zero coefficients. Wherein the number of non-zero coefficients indicates the number of non-zero coefficients actually reported by the terminal device. For convenience of distinguishing and explanation, the number of non-zero coefficients actually reported by the terminal device is denoted as K,2K ₀ K is more than or equal to 1 and is an integer.

Firstly, the network device may determine, according to p configured in advance and RI indicated by the terminal device in the first portion of CSI report, the maximum number M of frequency domain vectors that the terminal device may report on the assumption that the physical uplink resources are sufficient ₀ . The network device may further determine that the terminal device reports L spatial vectors, M according to the preconfigured L and the reporting number K of the non-zero coefficients indicated by the terminal device in the first portion of the CSI report ₀ The total number of bits required for the frequency domain vectors and K weighting coefficients, e.g. denoted Q ₁ ，Q ₁ Is more than or equal to 1 and is an integer. As previously described, the indication overhead of the precoding matrix in the second part of the CSI report is related to the indication overhead of the spatial vector, the indication overhead of the frequency domain vector, the bitmap length, and the quantization overhead of the non-zero coefficients.

For ease of understanding, the specific process by which the network device determines whether the terminal device has discarded a portion of the frequency domain vectors and the number of reported frequency domain vectors is described by taking the bit overhead in table 9-a as an example. The Q is ₁ Can be compared with Q in Table 9-a above _F8 Has a corresponding relationship. Specifically, Q ₁ ＝Q _L +Q _F8 +Q _C '. Wherein Q is _C ' represents quantization bits for K non-zero coefficients. Here, Q _C ' and Q as described above _C May be the same or different. Specifically, Q _C ’≤Q _C 。

On the other hand, the network device may determine the maximum number of bits Q that can be carried according to the physical uplink resources that are pre-allocated to the terminal device.

If Q ₁ If Q is greater than Q, the network device can determine that the terminal device discards a part of the frequency domain vectors, or the number of the frequency domain vectors reported by the terminal device is less than M ₀ . The network device may determine that the terminal device discarded the weaker of the initial frequency domain vectors corresponding to column 4 as set forth in the bottom row of table 9-aAnd the initial frequency domain vector.

The network device may further calculate that the discardL space vectors after the initial frequency domain vectors, Total ratio required for each frequency domain vector and K weighting coefficientsThe number of bits, e.g. denoted as Q ₂ ，Q ₁ ≥Q ₂ Not less than 1 and Q ₂ Is an integer. The Q is ₂ Can be compared with Q in Table 9-a above _F7 Has a corresponding relationship. Specifically, Q ₂ ＝Q _L +Q _F7 +Q _C ’。

If Q ₂ If Q is higher than Q, the physical uplink resource is still insufficient, and the network device can determine that the terminal device discards more frequency domain vectors, or that the number of the frequency domain vectors reported by the terminal device is smaller thanThe network device may further determine that the terminal device has discarded the weaker ++in the initial frequency domain vector corresponding to column 3 as set forth in the penultimate row in Table 9-a>And the initial frequency domain vector.

The network device may further calculate that the discardL space vectors after the initial frequency domain vectors, The total number of bits required for the frequency-domain vectors and K non-zero coefficients, e.g. denoted Q ₃ ，Q ₁ ≥Q ₂ ≥Q ₃ Not less than 1 and Q ₃ Is an integer. The Q is ₃ Can be compared with Q in Table 9-a above _F6 Has a corresponding relationship. Specifically, Q ₂ ＝Q _L +Q _F6 +Q _C ’。

If Q ₃ If Q is higher than Q, the physical uplink resource is still insufficient, and the network device can determine that the terminal device discards more frequency domain vectors, or that the number of the frequency domain vectors reported by the terminal device is smaller thanIn this case, the network device may calculate by substituting the bit overhead corresponding to each row in table 9-a into the calculation formula of the total bit overhead in the order from bottom to top according to the method described above until the total bit overhead is less than or equal to Q. />

For example, if Q ₃ If Q is less than or equal to Q, the network device can determine that the physical uplink resource is enough, the terminal device does not need to discard more frequency domain vectors, or the number of the frequency domain vectors reported by the terminal device is

Thus, the network device may determine the number M of frequency domain vectors reported by the terminal device and the bit overhead for indicating the precoding matrix in the second part of the CSI report. The network device may thereby determine the length of the CSI report in order to properly decode the second part of the CSI report to obtain the information therein.

It should be noted that, as can be seen from the above description, the network device may determine the number of frequency domain vectors actually reported by the terminal device according to the bit overhead corresponding to each priority. This requires that the prioritization of the initial frequency domain vectors be predetermined. For example, column priority and grouping rules are predetermined. The bit overhead and the actual number of reported frequency domain vectors for each priority can be determined as shown in table 9-a.

However, if the priority order is not determined, the network device may not be able to accurately determine the number of frequency domain vectors actually reported by the terminal device. As shown in tables such as table 7, table 8, table 11, table 12, table 15, and tables 16 to table, the column priority ranks of the respective columns are not determined. The terminal device selects one of the predefined plurality of column prioritizations for use. But the network device is not aware of the column prioritization selected by the terminal device in advance. The network device cannot determine the rank order without knowing the rank order, and therefore cannot determine the bit overhead and the actual number of reported frequency domain vectors for each rank (or each row in the table).

Therefore, in the case where the prioritization is not unique, it is necessary to further make the following definition:

1. the number of initial frequency domain vectors corresponding to the Z columns is the same. That is to say,

2、M ₀ the initial frequency-domain vectors are divided into T groups, each group of initial frequency-domain vectors including a portion of the initial frequency-domain vectors corresponding to one or more of the Z columns. The initial frequency domain vectors corresponding to each column are sequentially divided into one or more groups of T groups according to the intensity.

For example, z=4,the three groups were divided. Wherein the first set of initial frequency-domain vectors comprises stronger 3 initial frequency-domain vectors corresponding to each column, the second set of initial frequency-domain vectors comprises medium-strength 2 initial frequency-domain vectors corresponding to each column, and the third set of initial frequency-domain vectors comprises weaker 4 initial frequency-domain vectors corresponding to each column. Although the column prioritization of the 4 columns is not determined, the prioritization may be determined as shown in table 26:

Table 26

And p < th) ₁ Stronger 3 initial frequency domain vectors in the initial frequency domain vectors corresponding to the columns
	And p < th) ₂ Stronger 3 initial frequency domain vectors in the initial frequency domain vectors corresponding to the columns
And p < th) ₃ Stronger 3 initial frequency domain vectors in the initial frequency domain vectors corresponding to the columns
	And p < th) ₄ Stronger 3 initial frequency domain vectors in the initial frequency domain vectors corresponding to the columns
And p < th) ₁ Medium-strength 3 initial frequency-domain vectors among initial frequency-domain vectors corresponding to each column
	And p < th) ₂ Medium-strength 3 initial frequency-domain vectors among initial frequency-domain vectors corresponding to each column
And p < th) ₃ Medium-strength 3 initial frequency-domain vectors among initial frequency-domain vectors corresponding to each column
	And p < th) ₄ Medium-strength 3 initial frequency-domain vectors among initial frequency-domain vectors corresponding to each column
And p < th) ₁ Weaker 2 initial frequency domain vectors of initial frequency domain vectors corresponding to the columns
	And p < th) ₂ Weaker 2 initial frequency domain vectors of initial frequency domain vectors corresponding to the columns
And p < th) ₃ Weaker 2 initial frequency domain vectors of initial frequency domain vectors corresponding to the columns
	And p < th) ₄ Weaker 2 initial frequency domain vectors of initial frequency domain vectors corresponding to the columns

The initial frequency-domain vectors in the table from row 1 to row 4 form a first set of initial frequency-domain vectors, the initial frequency-domain vectors in the table from row 5 to row 8 form a second set of initial frequency-domain vectors, and the initial frequency-domain vectors in the table from row 9 to row 12 form a third set of initial frequency-domain vectors.

In this way, no matter how the column priority order of the Z columns changes, the corresponding bit overhead and the actual number of reported frequency domain vectors can still be determined.

It should be appreciated that the above is merely for ease of understanding, and the process of determining the bit overhead and the actual number of reported frequency domain vectors corresponding to each row in the table based on the two constraints listed above is illustrated by specific numerical values. But this should not constitute any limitation to the present application. For Z, T,To->And the specific values of the number of the initial frequency domain vectors corresponding to each column in each group are not limited.

Thus, the network device may determine the length of the second portion of the CSI report based on the determined actual number of reported frequency domain vectors and thus correctly decode the second portion of the CSI report.

Although the network device may determine the number of frequency domain vectors that are actually reported, the network device may still not determine the number of frequency domain vectors corresponding to each column. In step 210, it is mentioned that the terminal device may indicate by an index of a combination of frequency domain vectors when M frequency domain vectors are indicated by the first indication information. For example, for the z-th column, through M ^z Indexing of combinations of frequency domain vectors to indicate M ^z And frequency domain vectors. Thus, in step 230, when determining M frequency domain vectors, the network device may determine a correspondence between a combination of frequency domain vectors and an index based on the number of frequency domain vectors corresponding to each layer (or each column), and determine a frequency domain vector reported based on each layer (or each column) based on the determined correspondence. Of course, when the terminal device indicates M frequency domain vectors by the first indication information, it may also be indicated by an index of each frequency domain vector, respectively. The specific manner in which the terminal device indicates the M frequency domain vectors is not limited in this application.

The specific procedure by which the network device determines the length of the second portion of the CSI report is described above in detail, taking the prioritization and corresponding bit overhead as shown in table 9-a for ease of understanding only. In the case where the priority order is fixed, the network device can determine the number of reported frequency domain vectors corresponding to each column based on the determined number of actually reported frequency domain vectors.

For example, the number of frequency domain vectors reported by the network device is determined to beThen, according to the priority ranking in the table 9-a, it can be determined which rows in the table 9-a correspond to the frequency domain vectors reported by the terminal device, and further, the reporting number of the frequency domain vectors corresponding to each column can be determined.

It should be understood that this should not constitute any limitation to the present application. The prioritization of the initial frequency domain vectors is not limited to that shown in table 9-a. Also, the prioritization of the initial frequency domain vectors is not necessarily predetermined. The specific process of prioritizing the initial frequency domain vectors of the network device is described in detail below.

As previously described, each initial frequency domain vector is defined with a column priority and a group priority. Wherein the column priority may be determined based on a column priority ordering and the group priority may be determined for the intensity size of the initial frequency domain vector corresponding to the same column and a predefined grouping rule.

In one aspect, the network device may group the initial frequency domain vectors corresponding to each column based on a predefined grouping rule.

As described above, the number of reported frequency domain vectors configured on a per-transport layer basis may be configured in advance for the terminal device by the network device. I.e., for the z-th column,is preconfigured to the terminal device by the network device, so after determining how to group the initial frequency domain vectors for each column, the network device can follow the preconfigurationM of (2) ^z And determining the number of each group of initial frequency domain vectors in the initial frequency domain vectors corresponding to the z-th column.

On the other hand, the network device may further determine a column prioritization of the individual columns.

In the relevant description above regarding step 210, a number of possible implementations of determining column prioritization are listed.

The network device may determine a column prioritization of the Z columns based on the sequence numbers of the transport layers to which the Z columns correspond. In such an implementation, the network device and the terminal device need to determine the sequence numbers of the Z transport layers based on the same manner. For example, the network device and the terminal device may determine the 1 st to the Z-th transport layers in order of the characteristic values from the large to the small after SVD is performed on the channel matrix.

In another possible implementation, the column priority of the Z columns may be determined from a predefined plurality of column prioritization. Each rank of the plurality of rank priorities may represent a rank of the plurality of rank priorities.

After the terminal device selects one of the predefined plurality of column prioritizations for use, the network device may be signaled the selected column prioritization.

Alternatively, the terminal device may indicate the index of the used column prioritization to the network device so that the network device determines the column priorities of the Z columns based on the same column prioritization. Wherein the index of the column prioritization may be determined, for example, according to the correspondence of the column prioritization with the index shown in table 1 above. It should be understood that table 1 is merely exemplary for ease of understanding and should not be construed as limiting the present application in any way. The correspondence between column priority ranks and indexes is not limited in this application. The specific manner in which the correspondence between column priority ranks and indexes is defined is also not limited in this application.

The above-mentioned column-prioritized index may be carried, for example, in the second part of the CSI report. After the network device completes the correct decoding of the second portion of the CSI report, the network device may further determine, according to the index of the rank priority ordering, the number of reports of the frequency domain vectors corresponding to each rank, and further determine the frequency domain vector corresponding to each rank.

It will be appreciated that based on the two-point constraint described above, the bit overhead for each group priority can be determined after the initial frequency domain vectors for the Z columns are divided into T groups. The terminal device therefore only has to report the ordering of the column priorities in the set of initial frequency domain vectors from which part of the columns were discarded.

Still taking table 23 as an example, if the terminal device discards only all of the third set of initial frequency-domain vectors, no indication is required for the network device, and if the terminal device discards all of the third set of initial frequency-domain vectors and a portion of the second set of initial frequency-domain vectors, the terminal device may indicate a rank-priority ranking of 4 ranks in the second set of initial frequency-domain vectors to the network device.

Typically, the column prioritization of the Z columns in each set of initial frequency domain vectors may be the same. The present application does not exclude the possibility that the column priorities of the Z columns in the two sets of initial frequency domain vectors are different.

Alternatively, the terminal device may indicate the column corresponding to the discarded initial frequency domain vector to the network device. Or, the terminal device indicates a column corresponding to the initial frequency domain vector which is not discarded to the network device.

As described above, the terminal device may indicate to the network device that the column corresponding to the partial initial frequency-domain vector in the certain set of initial frequency-domain vectors is discarded. In one implementation, the terminal device may indicate by Z indication bits, which may correspond to Z columns, each indication bit indicating whether the initial frequency domain vector of the corresponding column is discarded. "0110" means that the initial frequency-domain vectors of the 1 st column and the 4 th column are discarded, and the initial frequency-domain vectors of the 2 nd column and the 3 rd column are not discarded. Therefore, for the group where part of the initial frequency-domain vector is discarded, the above-mentioned Z indication bits are equivalent to the columns corresponding to the initial frequency-domain vector which is not discarded.

In this case, the network device may not pre-store the above-mentioned plurality of column priority ranks, nor pre-store the correspondence between the plurality of column priority ranks and the index.

It should be understood that the specific method of indicating the columns corresponding to the discarded initial frequency domain vectors by the Z indication bits listed here is only an example and should not constitute any limitation to the present application.

Based on the method described above, the terminal device may determine M based on the column priority and the group priority of the initial frequency domain vector ₀ Prioritization of the initial frequency domain vectors and from M according to the prioritization ₀ And selecting M frequency domain vectors from the initial frequency domain vectors to report. The network device may determine M frequency domain vectors based on the same prioritization.

The method does not need to additionally indicate the reporting number of the frequency domain vectors by predefining the column priority and the group priority of the initial frequency domain vectors. Therefore, there is no need to increase the indication of the number of frequency domain vectors in the first part of CSI report, and the indication overhead of the first part is not increased. In addition, in the case of unique column priority, the column priority is decremented with increasing sequence number of the transport layer as described above, and no additional indication information is added to the second part of the CSI report; in case of non-unique column priority, the columns corresponding to the discarded initial frequency domain vectors need only be indicated with a few bits of overhead in the second part of the CSI report. In general, therefore, the physical uplink resources are used to the greatest extent for carrying the above-mentioned L spatial vector indicating information, M frequency domain vector indicating information, K spatial vector pair position indicating information, and K weighting coefficient quantization information. In the case of limited resources, the precoding matrix is indicated with higher feedback accuracy as much as possible.

In another implementation manner, the terminal device may also feed back the estimated channel matrix to the network device, and the network device determines a precoding matrix adapted to the channel matrix. The network device may recover the channel matrix based on the feedback from the terminal device. Thereafter, the network device may determine the precoding matrix, for example, by performing SVD on the channel matrix or the covariance matrix of the channel matrix, or may determine the precoding matrix by performing EVD on the covariance matrix of the channel matrix, as listed above.

In this implementation, the channel matrix determined by the terminal device may be referred to as a channel matrix to be fed back, or a channel matrix to be reported. It is understood that the channel matrix to be fed back may be determined by the terminal device based on channel estimation. The terminal equipment can indicate the channel matrix to be fed back through PMI, and can also indicate the channel matrix to be fed back through other signaling, so that the network equipment recovers the channel matrix based on the feedback of the terminal equipment. The channel matrix recovered by the network device based on the feedback of the terminal device can be the same as or similar to the channel matrix to be fed back.

In downlink channel measurement, the higher the approximation degree between the channel matrix determined by the network device according to the feedback of the terminal device and the channel matrix determined by the terminal device, the more the determined precoding matrix for data transmission can be adapted to the real downlink channel, so that the transmission quality of signals can be improved.

The precoding matrix may also be determined by the network device based on the channel matrix fed back by the terminal device. The information for indicating the channel matrix fed back by the terminal device may also be considered as one for indirectly indicating the precoding matrix.

In such an implementation, the terminal device may feed back on a per receive antenna basis. The M frequency domain vectors indicated by the first indication information in step 210 above may be used to construct a channel matrix for one or more frequency domain units, thereby determining a precoding matrix for the one or more frequency domain units.

Assuming that the number of receiving antennas is R, R is equal to or greater than 1 and is an integer, the channel matrix may include R columns, each of which may be constructed from a frequency-domain vector corresponding to an R-th column of M frequency-domain vectors. The frequency domain vector corresponding to the r-th column is selected from the initial frequency domain vectors corresponding to the r-th column. As previously described, each initial frequency domain vector is defined with a column priority and a group priority. Accordingly, the frequency domain vector corresponding to the r-th column reported by the terminal device may be determined based on the column priority and the group priority of the initial frequency domain vector corresponding to the r-th column.

Based on the column priority and the group priority of the initial frequency domain vector, from M ₀ The specific method for selecting M frequency domain vectors from the initial frequency domain vectors is described in detail above, and for brevity, details are not repeated here. The above-described "corresponding to Z columns" may be replaced with "corresponding to R columns", that is, "corresponding to R receiving antennas".

In one implementation, the column priority of the R columns decreases with increasing sequence number of the corresponding receiving antenna. In another implementation, the column priority of the R columns may be determined from a predefined plurality of column priorities, and the network device may be informed of the column to which the discarded initial frequency domain vector corresponds by an index of the used column priorities. In yet another implementation, the column priority of the R columns is determined by the terminal device itself and indicates the column to which the discarded initial frequency domain vector corresponds by the R indication bits corresponding to the R columns.

Since the specific process of the terminal device for feeding back the precoding matrix based on the receiving antenna is similar to the specific process of feeding back the precoding matrix based on the transmission layer, detailed description will not be given here for brevity.

In another implementation manner, the terminal device may also directly reduce the number of reported frequency domain vectors and report the frequency domain vectors and the corresponding weighting coefficients based on the reduced number of reported frequency domain vectors when the pre-allocated physical uplink channel resources are insufficient. A method for reporting CSI according to another embodiment of the present application is described in detail below with reference to fig. 3.

Fig. 3 is a schematic flow chart of a method 300 of reporting CSI provided by another embodiment of the present application, shown from a device interaction perspective. As shown in fig. 3, the method 300 may include steps 310 through 330.

For convenience of explanation of the embodiment of the present application, the following parameters are also defined in the method 300:

z: the terminal device feeds back a rank (rank) based on the channel measurement. Z is more than or equal to 1 and is an integer. In the embodiment of the present application, the rank fed back by the terminal device based on the channel measurement may be equal to the number of transmission layers.

J ₀ : maximum reporting number of frequency domain vectors corresponding to one transmission layer. J (J) ₀ Is more than or equal to 1 and is an integer. The maximum reported number of frequency domain vectors corresponding to each transmission layer can be determined by, for exampleTo determine. Since p and R have been described in detail in method 200 above, they are not repeated here for brevity.

M ₀ : and the terminal equipment determines the maximum reporting number of the frequency domain vectors according to the configuration of the network equipment and the rank Z. M is M ₀ Is more than or equal to 1 and is an integer. In this embodiment, the maximum reporting number of the frequency domain vectors corresponding to any two transmission layers is the same, so M ₀ ＝J ₀ ×Z。

J: the number of reported frequency domain vectors corresponding to one transmission layer, which are actually reported by the terminal equipment. J (J) ₀ More than or equal to J is more than or equal to 1, and J is an integer.

M: the number of frequency domain vectors actually reported by the terminal equipment. When the rank Z is greater than 1, M may specifically refer to the sum of the reporting numbers of the frequency domain vectors corresponding to each transmission layer. In this embodiment, the number of reported frequency domain vectors corresponding to any two transmission layers is the same, so m=j×z.

The steps in method 300 are described in detail below.

In step 310, the terminal device generates fourth indication information, where the fourth indication information is used to indicate J frequency domain vectors to be reported, the J frequency domain vectors are used to construct precoding vectors of one or more frequency domain units, and the J frequency domain vectors are determined from J ₀ And the initial frequency domain vectors are determined according to preset rules.

Specifically, the fourth indication information may be determined by the terminal device based on the result of the channel measurement. The J frequency domain vectors reported by the fourth indication information may be used to construct frequency domain vectors of one or more frequency domain units on a transport layer. A transport layer as referred to herein may be any one of one or more transport layers.

It should be noted that, in the embodiment of the present application, the above J frequency domain vectors may be used to construct a precoding vector of one or more frequency domain units on one transmission layer, which does not mean that the terminal device determines only J frequency domain vectors corresponding to the transmission layer based on channel measurement. The number of frequency domain vectors determined by the terminal device based on the channel measurement may be J or may be greater than J. The frequency domain vector (whether J or greater than J) determined by the terminal device based on the channel measurements may be used to construct a precoding vector for one or more frequency domain units on its corresponding transport layer.

For convenience of distinction and explanation, the frequency domain vector determined by the terminal device based on the channel measurement is referred to as an initial frequency domain vector in the embodiment of the present application. Under the condition of sufficient physical uplink resources, the terminal equipment can report all the determined initial frequency domain vectors to the network equipment. In this case, the number of initial frequency domain vectors determined by the terminal device may be J; and under the condition of insufficient physical uplink resources, the terminal equipment can select a part of frequency domain vectors from the initial frequency domain vectors determined by the terminal equipment and report the part of frequency domain vectors to the network equipment. In this case, the number of initial frequency domain vectors determined by the terminal device may be greater than J.

Note that J refers to the number of reported frequency domain vectors corresponding to one transmission layer, that is, the number of frequency domain vectors corresponding to one column in the precoding matrix. When the rank Z is greater than 1, the terminal device may determine one or more frequency domain vectors corresponding to each transmission layer based on the manner described below. The frequency domain vectors corresponding to the transmission layers may be different from each other or may be partially the same, which is not limited in this application.

For ease of understanding, the method provided in the present application will be described below by taking a determination procedure of a frequency domain vector corresponding to one transport layer as an example.

In the embodiment of the present application, the J frequency domain vectors may be represented by J ₀ And the initial frequency domain vectors are determined according to preset rules. Wherein J is ₀ The initial frequency domain vectors may be determined by the terminal device based on channel measurements. The terminal device may determine at least one optional value for the number of reported frequency domain vectors according to a preset rule. The terminal device may select a value from the at least one selectable value as the reported number of frequency domain vectors. It will be appreciated that any one of the at least one selectable value is less than J ₀ . That is, when the terminal device selects any one value from the at least one selectable value as the reported number of the frequency domain vector, the above-mentioned J is referred to ₀ Some of the initial frequency-domain vectors are discarded. In other words, the frequency domain vector actually reported by the terminal device is J ₀ A portion of the initial frequency domain vectors. Therefore, the value selected by the terminal device as the reporting number of the frequency domain vector can reduce the overhead of each indication of the reporting number of the frequency domain vector.

The terminal equipment can be based on the preset rules and J ₀ The determined at least one alternative value estimates, one by one, the total cost corresponding to each alternative value. The overhead described herein may include: indication overhead of frequency domain vectors, indication overhead of space domain vectors, indication overhead of positions of space frequency vector pairs and quantization overhead of weighting coefficients corresponding to each transmission layer; alternatively, since the indication overhead of the spatial vector is not related to the number of reported frequency domain vectors, the indication overhead of the spatial vector may be predetermined, so the total overhead may exclude the indication overhead of the spatial vector, and include only: the indication overhead of the frequency domain vector corresponding to each transport layer, the indication overhead of the position of the space-frequency vector pair, and the quantization overhead of the weighting coefficient.

It will be appreciated that the terminal device may eventually consider the overhead of the above items when determining whether the maximum number of bits that can be carried by the physical uplink resource is sufficient, including, for example: the indication overhead of the frequency domain vector, the indication overhead of the space domain vector, the indication overhead of the position of the space frequency vector pair and the quantization overhead of the weighting coefficient corresponding to each transmission layer.

It should be noted that, in the embodiment of the present application, it is assumed that the spatial vector is shared among the multiple transmission layers, and thus the spatial vector may be indicated only once. I.e. the indicated overhead of the spatial vector is the same whether Z is equal to 1 or greater than 1. But the indication overhead of the frequency domain vector, the indication overhead of the position of the space-frequency vector pair and the quantization overhead of the weighting coefficient are doubled with the increase of the Z value. Therefore, care should also be taken to consider the size of Z when determining the overhead.

It should also be appreciated that when the information listed above is carried in a CSI report for transmission, the overhead of the CSI report is not limited to the above list, and no detailed description is given here since other information in the CSI report is not involved in the embodiments of the present application.

If the total cost determined by the terminal device taking a certain value as the reporting number of the frequency domain vector can make the total cost smaller than or equal to the range of the maximum bit number which can be carried by the pre-allocated physical uplink resource, the value can be determined as the reporting number of the frequency domain vector. When the terminal device determines that the number of values which can be the reporting number of the frequency domain vector is greater than 1 from at least one optional value, the terminal device can comprehensively consider feedback overhead and feedback precision to obtain a compromise of the feedback overhead and the feedback precision.

In order to facilitate understanding, a detailed description is given below of a specific process of determining the reporting number of the frequency domain vector by the terminal device in combination with several possible preset rules.

The number of reported frequency domain vectors corresponding to each transmission layer may be the same or different. The present application is not limited in this regard. If the number of reported frequency domain vectors corresponding to each transmission layer is different, a plurality of selectable values can be determined for the number of reported frequency domain vectors according to the maximum number of reported frequency domain vectors corresponding to each transmission layer and a preset rule. The terminal device may determine the number of reported frequency domain vectors corresponding to each transport layer based on at least one selectable value corresponding to each transport layer. If the number of reported frequency domain vectors corresponding to each transmission layer is the same and the maximum number of reported frequency domain vectors corresponding to each transmission layer is the same, at least one optional value can be determined for the number of reported frequency domain vectors corresponding to each transmission layer based on the maximum number of reported frequency domain vectors and a preset rule, and the same number of reported frequency domain vectors is determined for each transmission layer.

In the following, for convenience of explanation, it is assumed that the maximum reporting number of the frequency domain vectors corresponding to each transmission layer is the same, and the actual reporting number of the frequency domain vectors corresponding to each transmission layer is the same.

As one embodiment, the preset rule includes: based on the number J of initial frequency domain vectors ₀ At least one optional value is determined for the number of reports of the frequency domain vector at predefined intervals. The number of the frequency domain vectors reported by the terminal device through the fourth indication information may be selected from the at least one optional value.

It should be understood that the value of 1 for a predefined interval is merely exemplary for ease of understanding, and that the predefined interval is 2 or other value. The at least one alternative value determined may also be different based on the different values of the interval. The values of the intervals and the specific values of the at least one optional value are not limited in the application.

When the terminal device determines the at least one alternative value (e.g. including J ₀ -1, … …,2, 1), the at least one alternative value may be assumed one by one as the reported number of frequency domain vectors to estimate the overhead.

As described above, the overhead related to the number of reported frequency domain vectors mainly includes the indication overhead of the frequency domain vectors corresponding to each transport layer, the indication overhead of the positions of the space-frequency vector pairs, and the quantization overhead of the weighting coefficients. The overhead of each item can be determined corresponding to the reporting number of different frequency domain vectors. Based on the above, the total cost corresponding to different reporting numbers can be determined by adding the indicating cost of the space vector.

When a certain value is assumed as the number of reported frequency domain vectors, and the estimated total overhead required is smaller than or equal to the range of the maximum bit number, the value can be directly determined as the number of frequency domain vectors actually reported by the terminal device, namely J. When the multiple values are assumed to be the number of reported frequency domain vectors, and the estimated total cost is smaller than or equal to the range of the maximum bit number, the feedback cost and the feedback precision are further considered comprehensively to select the value capable of obtaining higher compromise efficiency as the number of the frequency domain vectors actually reported by the terminal equipment.

As previously described, due to the pair J ₀ The total overhead required after discarding a part of the initial frequency domain vectors may be less than the maximum number of bits, and the free resources may be used to carry quantization information of more weighting coefficients, so as to obtain higher feedback accuracy. The terminal device may therefore trade-off between multiple alternative values to determine the actual number of reported frequency domain vectors.

As another embodiment, the preset rule includes: based on the number J of initial frequency domain vectors ₀ And at least one predefined optional coefficient, determining at least one optional value for the reported number of frequency domain vectors. The number of the frequency domain vectors reported by the terminal device through the fourth indication information may be selected from the at least one optional value.

Optionally, the at least one optional coefficient includes: 3/4,1/2,1/4.

Based on the at least one optional coefficient, at least one optional report number may be obtained. For example, the number of the cells to be processed,/>or (F)>Alternatively, [3J ₀ /4]，[J ₀ /2]，[J ₀ /4]。

optionally, the at least one optional factor comprises 1/2.

optionally, the at least one optional factor comprises 2/3,1/3.

optionally, the at least one optional factor comprises 3/4,1/2.

Based on the at least oneThe optional coefficient may result in at least one optional report number. For example, the number of the cells to be processed, Or (F)>Alternatively, [3J ₀ /4]，[J ₀ /2]。

wherein,representing a round up->Representing a rounding down []Representing a nearby rounding. After the protocol defines a manner of determining the number of optional reports according to a certain manner, the network device and the terminal device may determine the number of optional reports in the same manner.

It should be understood that the coefficients listed above and the specific manner in which the number of reports is determined are merely examples and should not be construed as limiting the application in any way. The number and the value of the coefficients and the specific mode for determining the reporting number are not limited.

After the terminal device determines the at least one optional value, the at least one optional value can be assumed to be the reported number of the frequency domain vectors one by one to estimate the total cost. Since the above embodiments have described the specific process of determining the actual number of reported frequency domain vectors by the terminal device through estimating the total overhead, for brevity, the description is omitted here.

It should be understood that the preset rules listed above are examples only and should not be construed as limiting the present application in any way. Based on the same conception, the person skilled in the art may make variations or equivalent substitutions to the preset rules listed above, and more possible preset rules may be obtained.

It should also be appreciated that the terminal device may determine the above J by itself after determining the number of reported frequency domain vectors based on the above method ₀ Which of the initial frequency-domain vectors are discarded. In one implementation, the terminal device may employ the method of determining discarded initial frequency-domain vectors based on priority as described in method 200 above to determine which initial frequency-domain vectors to discard. In another implementation, the terminal device may also determine J ₀ And determining the initial frequency domain vector with the minimum priority to discard the power or the amplitude of the weighting coefficient corresponding to each initial frequency domain vector. It should be understood that these implementations are merely examples and should not be construed as limiting the present application in any way. The terminal device determines which initial frequency domain vectors to discard belong to the internal implementation behavior of the terminal device, which is not limited in this application.

Optionally, the J frequency domain vectors correspond to one of a plurality of transmission layers, and the number of reported frequency domain vectors corresponding to any two of the plurality of transmission layers is the same.

Because the maximum reporting number of the frequency domain vectors corresponding to each transmission layer is the same, the terminal device can determine the reporting number of the frequency domain vectors corresponding to each transmission layer based on the same maximum reporting number and a preset rule. The number of the frequency domain vectors reported by the terminal equipment based on any two transmission layers is the same, so that the terminal equipment is convenient to realize.

After determining the J frequency domain vectors to be reported, the terminal device may generate fourth indication information based on the determined J frequency domain vectors. The specific manner in which the terminal device indicates the one or more frequency domain vectors via the indication information has been described in detail in step 210 in method 200 above and is not repeated here for the sake of brevity.

The fourth indication information may be used to indicate only the J frequency domain vectors, or may be used to indicate J frequency domain vectors, L spatial vectors, the positions of the selected spatial vector pairs, and the weighting coefficients. The present application is not limited in this regard.

As described above, the J frequency domain vectors are frequency domain vectors corresponding to one transport layer. When the fourth indication information is used for indicating the spatial vector, the indicated spatial vector may be the spatial vector corresponding to the same transmission layer. The fourth indication information indicates the position of the selected space-frequency vector pair, and the indicated space-frequency vector pair is the position of the space-frequency vector pair corresponding to the same transmission layer. The fourth indication information may be used to indicate a weighting factor, and the weighting factor indicated by the fourth indication information may be a weighting factor corresponding to the same transmission layer.

Since L spatial vectors are shared among the plurality of transmission layers, the fourth indication information may indicate only J frequency domain vectors, the positions of the selected pair of spatial vectors, and the weighting coefficients, and not the L spatial vectors. The L spatial vectors may be indicated with additional information. The present application is not limited in this regard.

When the rank Z is greater than 1, the terminal device may indicate L spatial vectors shared by the Z transport layers, J frequency domain vectors corresponding to each transport layer, a position and a weighting coefficient of a selected pair of spatial vectors corresponding to each transport layer. The above-listed indication of the space domain vector, the frequency domain vector corresponding to each transmission layer, and the position and the weighting coefficient of the space-frequency vector pair corresponding to each transmission layer may be indicated by the fourth indication information, or may be indicated by more different information, which is not limited in this application.

The specific method by which the terminal device indicates the spatial vectors, the frequency domain vectors, and the weighting coefficients is described in detail above in step 210 of method 200 and is not repeated here for brevity.

In step 320, the terminal device transmits the fourth indication information. Correspondingly, the network device receives the fourth indication information.

The relevant description of step 320 may be referred to the relevant description of step 220 in method 200 above and will not be repeated here for brevity.

In step 330, the network device determines J frequency domain vectors according to the fourth indication information.

The specific process of the network device determining the J frequency domain vectors according to the fourth indication information corresponds to the specific method of the terminal device generating the fourth indication information according to the J frequency domain vectors. When the network device and the terminal device agree on the indication modes of the J frequency domain vectors in advance, the two parties can generate and interpret fourth indication information based on the corresponding modes.

After determining the J frequency domain vectors, the network device may determine a precoding vector of one or more frequency domain units by combining the spatial vector reported by the terminal device, the position of the selected space frequency vector pair, and the weighting coefficient. After determining the precoding vector of each frequency domain vector corresponding to each transmission layer, the network device may further determine a precoding matrix of each frequency domain unit.

Since the specific process of recovering the precoding matrix by the network equipment has been described in detail in the method 200, it is not repeated here for brevity.

Optionally, the fourth indication information is carried in a CSI report.

In particular, the fourth indication information may be carried in the second part of the CSI report, for example. The second portion of the CSI report may include, in addition to the fourth indication information, for example, indication information of a spatial vector, a position indication (e.g., a bitmap) of a spatial vector pair, quantization information of a weighting coefficient, and the like. The present application is not limited in this regard.

A specific method for the network device to estimate the length of the second portion of the CSI report according to the first portion of the CSI report may refer to the related description of the method 200 above, and will not be repeated here for brevity.

Optionally, the CSI report further includes a bitmap of length 2l×z×j.

Wherein each 2 lxj bits may correspond to one transport layer, for indicating from which spatial vectors and frequency domain vectors the precoding vectors of the corresponding transport layer may be constructed. The specific indication manner of the bitmap is described in detail above, and for brevity, it is not repeated here.

Based on the above technical solution, the terminal device may discard a portion of the initial frequency domain vectors based on the number of the initial frequency domain vectors and a preset rule under the condition that the pre-allocated physical uplink resources are insufficient. Since the number of reported frequency domain vectors is reduced, the indication overhead of the positions of the associated space frequency vector pairs and the quantization overhead of the weighting coefficients are also reduced, and in some cases, the indication overhead of the frequency domain vectors is also reduced. Furthermore, since the total overhead required after discarding a portion of the initial frequency domain vector may be less than the maximum number of bits that can be carried by the pre-allocated physical uplink resources of the network device. This partially free resource may be used to indicate more weighting coefficients corresponding to the frequency domain vectors that have not been discarded. Therefore, physical uplink resources can be fully utilized, and the feedback precision is improved.

It should be understood that, in the foregoing embodiments, the sequence number of each process does not mean that the execution sequence of each process should be determined by the function and the internal logic of each process, and should not constitute any limitation on the implementation process of the embodiments of the present application.

The method provided in the embodiment of the present application is described in detail above with reference to fig. 2 and 3. The following describes in detail the apparatus provided in the embodiments of the present application with reference to fig. 4 to 6.

Fig. 4 is a schematic block diagram of a communication device provided in an embodiment of the present application. As shown in fig. 4, the communication apparatus 1000 may include a processing unit 1100 and a transceiving unit 1200.

In one possible design, the communication device 1000 may correspond to the terminal device in the above method embodiment, for example, may be the terminal device, or a component (such as a chip or a circuit) configured in the terminal device.

It is to be understood that the communication apparatus 1000 may correspond to a terminal device in the method 200 or the method 300 according to an embodiment of the present application, and that the communication apparatus 1000 may comprise means for performing the method 200 in fig. 2 or the method 300 in fig. 3. And, each unit in the communication device 1000 and the other operations and/or functions described above are respectively for implementing the corresponding flow of the method 200 in fig. 2 or the method 300 in fig. 3.

When the communication device 1000 is used to perform the method 200 in fig. 2, the processing unit 1100 may be used to perform the step 210 in the method 200, and the transceiver unit 1200 may be used to perform the step 220 in the method 200. It should be understood that the specific process of each unit performing the corresponding steps has been described in detail in the above method embodiments, and is not described herein for brevity.

When the communication device 1000 is used to perform the method 300 of fig. 3, the processing unit 1100 may be used to perform the step 310 of the method 200, and the transceiver unit 1200 may be used to perform the step 320 of the method 300. It should be understood that the specific process of each unit performing the corresponding steps has been described in detail in the above method embodiments, and is not described herein for brevity.

It should also be understood that when the communication apparatus 1000 is a terminal device, the transceiver unit 1200 in the communication apparatus 1000 may be implemented through a communication interface (such as a transceiver or an input/output interface), for example, may correspond to the transceiver 2020 in the terminal device 2000 shown in fig. 5, and the processing unit 1100 in the communication apparatus 1000 may be implemented through at least one processor, for example, may correspond to the processor 2010 in the terminal device 2000 shown in fig. 5.

In another possible design, the communication apparatus 1000 may correspond to the network device in the above method embodiment, for example, may be a network device, or a component (such as a chip or a circuit) configured in the network device.

It is to be understood that the communication apparatus 1000 may correspond to a network device in the method 200 or the method 300 according to an embodiment of the present application, and the communication apparatus 1000 may include a unit for performing the method 200 in fig. 2 or the method 300 in fig. 3. And, each unit in the communication device 1000 and the other operations and/or functions described above are respectively for implementing the corresponding flow of the method 200 in fig. 2 or the method 300 in fig. 3.

When the communication device 1000 is used to perform the method 200 in fig. 2, the processing unit 1100 may be used to perform the step 230 in the method 200, and the transceiver unit 1200 may be used to perform the step 220 in the method 200. It should be understood that the specific process of each unit performing the corresponding steps has been described in detail in the above method embodiments, and is not described herein for brevity.

When the communication device 1000 is used to perform the method 300 of fig. 3, the processing unit 1100 may be used to perform the step 330 of the method 300, and the transceiver unit 1200 may be used to perform the step 320 of the method 300. It should be understood that the specific process of each unit performing the corresponding steps has been described in detail in the above method embodiments, and is not described herein for brevity.

It should also be understood that when the communication apparatus 1000 is a network device, the transceiver unit in the communication apparatus 1000 may be implemented through a communication interface (such as a transceiver or an input/output interface), for example, may correspond to the transceiver 3200 in the network device 3000 shown in fig. 6, and the processing unit 1100 in the communication apparatus 1000 may be implemented through at least one processor, for example, may correspond to the processor 3100 in the network device 3000 shown in fig. 6.

Fig. 5 is a schematic structural diagram of a terminal device 2000 provided in an embodiment of the present application. The terminal device 2000 may be applied to a system as shown in fig. 1, and perform the functions of the terminal device in the above-described 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. Wherein the processor 2010, the transceiver 2002 and the memory 2030 may communicate with each other through an internal connection path, and transfer control and/or data signals, the memory 2030 is used for storing a computer program, and the processor 2010 is used for calling and running 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 for transmitting uplink data and uplink control signaling output by the transceiver 2020 through a wireless signal.

The processor 2010 and the memory 2030 may be combined into a single processing device, and the processor 2010 is configured to execute program codes stored in the memory 2030 to implement the functions described above. In particular implementations, the memory 2030 may also be integrated within the processor 2010 or separate from the processor 2010. The processor 2010 may correspond to the processing unit of fig. 4.

The transceiver 2020 may correspond to the transceiver unit in fig. 4, and may also be referred to as a transceiver unit. The transceiver 2020 may include a receiver (or receiver, receiving circuitry) and a transmitter (or transmitter, transmitting circuitry). Wherein the receiver is for receiving signals and the transmitter is for transmitting signals.

It should be understood that the terminal device 2000 shown in fig. 5 is capable of implementing various processes involving the terminal device in the method embodiments shown in fig. 2 or fig. 3. The operations and/or functions of the respective modules in the terminal device 2000 are respectively for implementing the corresponding flows in the above-described method embodiment. Reference is specifically made to the description in the above method embodiments, and detailed descriptions are omitted here as appropriate to avoid repetition.

The above-described processor 2010 may be used to perform the actions described in the previous method embodiments as being performed internally by the terminal device, while the transceiver 2020 may be used to perform the actions described in the previous method embodiments as being transmitted to or received from the network device by the terminal device. Please refer to the description of the foregoing method embodiments, and details are not repeated herein.

Optionally, the terminal device 2000 may also include a power supply 2050 for providing power to various devices or circuits in the terminal device.

In addition, in order to make the functions of the terminal device more complete, 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. 6 is a schematic structural diagram of a network device provided in the embodiment of the present application, for example, may be a schematic structural diagram of a base station. The base station 3000 may be applied to the system shown in fig. 1, and perform 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 frequency unit (remote radio unit, RRU) 3100 and one or more baseband units (BBUs) (also 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. 4. Alternatively, the transceiver unit 3100 may also be referred to as a transceiver, a transceiver circuit, or a transceiver, etc., which may include at least one antenna 3101 and a radio frequency unit 3102. Alternatively, the transceiving unit 3100 may include a receiving unit, which may correspond to a receiver (or receiver, receiving circuit), and a transmitting unit, which may correspond to a transmitter (or transmitter, transmitting circuit). The RRU 3100 is mainly configured to receive and transmit a radio frequency signal and convert the radio frequency signal to a baseband signal, for example, to send indication information to a terminal device. The BBU 3200 portion is mainly used for performing baseband processing, controlling a base station, and the like. The RRU 3100 and BBU 3200 may be physically disposed together, or may be physically disposed separately, i.e. a distributed base station.

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. 4, and is mainly used for performing baseband processing functions, such as channel coding, multiplexing, modulation, spreading, and so on. For example, the BBU (processing unit) may be configured to control the base station to perform the operation procedure with respect to the network device in the above-described method embodiment, for example, generate the above-described indication information, etc.

In one example, the BBU 3200 may be configured by one or more single boards, where the multiple single boards may support a single access radio access network (such as an LTE network) together, or may support radio access networks of different access systems (such as an LTE network, a 5G network, or other networks) respectively. 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 configured to control the base station to perform necessary actions, for example, to control the base station to perform the operation procedure related to the network device in the above method embodiment. The memory 3201 and processor 3202 may serve one or more boards. That is, the memory and the processor may be separately provided on each board. It is also possible that multiple boards share the same memory and processor. In addition, each single board can be provided with necessary circuits.

It should be understood that the base station 3000 shown in fig. 6 is capable of implementing various processes involving network devices in the method embodiments shown in fig. 2 or fig. 3. The operations and/or functions of the respective modules in the base station 3000 are respectively for implementing the corresponding flows in the above-described method embodiments. Reference is specifically made to the description in the above method embodiments, and detailed descriptions are omitted here as appropriate to avoid repetition.

The BBU 3200 described above may be used to perform actions described in the foregoing method embodiments as being implemented internally by a network device, while the RRU 3100 may be used to perform actions described in the foregoing method embodiments as being transmitted to or received from a terminal device by the network device. Please refer to the description of the foregoing method embodiments, and details are not repeated herein.

It should be understood that the base station 3000 shown in fig. 6 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 devices of other architectures. For example, network devices including CUs, DUs, and AAUs, etc. The specific architecture of the network device is not limited in this application.

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 method embodiments described above.

It should 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 (field programmable gate array, FPGA), an application specific integrated chip (application specific integrated circuit, ASIC), a system on chip (SoC), a central processing unit (central processor unit, CPU), a network processor (network processor, NP), a digital signal processing circuit (digital signal processor, DSP), a microcontroller (micro controller unit, MCU), a programmable controller (programmable logic device, PLD) or other integrated chip.

In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in a processor or by instructions in the form of software. The steps of a method disclosed in connection with the embodiments of the present application may be embodied directly in a hardware processor for execution, or in a combination of hardware and software modules in the processor for execution. The software modules may be located in a random access memory, flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, etc. as well known in the art. The storage medium is located in a memory, and the processor reads the information in the memory and, in combination with its hardware, performs the steps of the above method. To avoid repetition, a detailed description is not provided herein.

It should be noted that the processor in the embodiments of the present application may be an integrated circuit chip with signal processing capability. In implementation, the steps of the above method embodiments may be implemented by integrated logic circuits of hardware in a processor or instructions in software form. The processor 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, or discrete hardware components. The disclosed methods, steps, and logic blocks 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 a method disclosed in connection with the embodiments of the present application may be embodied directly in hardware, in a decoded processor, or in a combination of hardware and software modules in a decoded processor. The software modules may be located in a random access memory, flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, etc. as well known in the art. The storage medium is located in a memory, and the processor reads the information in the memory and, in combination with its hardware, performs the steps of the above method.

It will be appreciated that the memory in embodiments of the present application may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The nonvolatile 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. The volatile memory may be random access memory (random access memory, RAM) which acts as an external cache. By way of example, and not limitation, many forms of RAM are available, such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous DRAM (SLDRAM), and direct memory bus 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 application, the application further provides a computer program product, which comprises: computer program code means for causing a computer to perform the method of the embodiment shown in fig. 2 or fig. 3 when the computer program code means are run on the computer.

According to the method provided in the embodiment of the present application, there is further provided a computer readable medium storing a program code, which when run on a computer, causes the computer to perform the method in the embodiment shown in fig. 2 or fig. 3.

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

The network device in the above-mentioned respective apparatus embodiments corresponds entirely to the network device or the terminal device in the terminal device and method embodiments, the respective steps are performed by respective modules or units, for example, the steps of receiving or transmitting in the method embodiments are performed by the communication unit (transceiver), and other steps than transmitting and receiving may be performed by the processing unit (processor). Reference may be made to corresponding method embodiments for the function of a specific unit. Wherein the processor may be one or more.

As used in this specification, the terms "component," "module," "system," and the like are intended to refer to a computer-related entity, either hardware, firmware, a combination of hardware and software, or software in execution. For example, a component may be, but is not limited to being, a process running on a processor, an object, an executable, a thread of execution, a program, and/or a computer. By way of illustration, both an application running on a computing device and the computing device can be a component. One or more components may reside within a process and/or thread of execution and a component may be localized on one computer and/or distributed between 2 or more computers. Furthermore, 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 one another 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 (illustrative logical block) and steps (steps) described in connection with the embodiments disclosed herein can 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 solution. 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 will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, and are not repeated herein.

In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.

The units described as separate units may or may not be physically separate, and units shown 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 may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

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

In the above-described embodiments, the functions of the respective functional units may be implemented in whole or in part 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). When the computer program instructions (program) are loaded and executed on a computer, the processes or functions described in accordance with the embodiments of the present application are fully or partially produced. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by a wired (e.g., coaxial cable, fiber optic, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains an integration of one or more available media. The usable medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a high-density digital video disc (digital video disc, DVD)), or a semiconductor medium (e.g., a Solid State Disk (SSD)), or the like.

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 may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a read-only memory (ROM), a random access memory (random access memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

The foregoing is merely 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 think about changes or substitutions within the technical scope of the present application, and the changes and substitutions are intended to 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 reporting channel state information CSI, comprising:

generating first indication information, wherein the first indication information is used for indicating M frequency domain vectors to be reported, and the M frequency domain vectors are used for constructing a precoding matrix of one or more frequency domain units; the precoding matrix of each frequency domain unit comprises Z columns, a Z-th column in the Z columns is constructed based on a frequency domain vector corresponding to the Z-th column in the M frequency domain vectors, and the frequency domain vector corresponding to the Z-th column is determined from an initial frequency domain vector corresponding to the Z-th column; the initial frequency domain vector corresponding to each column comprises one or more groups of initial frequency domain vectors, each group of initial frequency domain vectors corresponds to one group of priorities, and each initial frequency domain vector corresponding to each column corresponds to one column of priorities; the M frequency domain vectors are determined from predetermined initial frequency domain vectors based on a column priority corresponding to each of the Z columns and a group priority of one or more groups of initial frequency domain vectors corresponding to each column; wherein M is more than or equal to 1, Z is more than or equal to 1 and less than or equal to Z, Z is more than or equal to 1, and M, Z and Z are integers;

and sending the first indication information.

2. The method of claim 1, wherein when the initial frequency-domain vector for each column comprises a plurality of sets of initial frequency-domain vectors, the set priorities of the plurality of sets of initial frequency-domain vectors are different from each other.

3. The method of claim 1 or 2, wherein the column priorities of the Z columns are different from each other.

4. A method according to any one of claims 1 to 3, wherein the initial frequency-domain vectors corresponding to the Z columns include T sets of initial frequency-domain vectors corresponding to T sets of priorities, the initial frequency-domain vectors corresponding to each column being grouped into one or more of the T sets of initial frequency-domain vectors in order of higher to lower set priorities; and, the same set of initial frequency-domain vectors includes initial frequency-domain vectors corresponding to one or more of the Z column priorities; wherein T is more than or equal to 1 and is an integer.

5. The method of claim 3 or 4, wherein the M frequency domain vectors are used to construct a precoding matrix for one or more frequency domain units, Z columns in the precoding matrix correspond to Z transmission layers, and the column priorities of the Z columns decrease with increasing sequence numbers of the corresponding transmission layers.

6. The method of claim 3 or 4, wherein the method further comprises:

and transmitting second indication information, wherein the second indication information is used for indicating the column priority orders of the Z columns, and the column priority orders of the Z columns are determined from a plurality of predefined column priority orders.

7. The method of claim 4, wherein the method further comprises:

transmitting third indication information, wherein the third indication information is used for indicating: the column corresponding to the initial frequency domain vector which is not reported in the initial frequency domain vector corresponding to the same group priority.

8. The method of claim 6 or 7, wherein the number of initial frequency domain vectors corresponding to any two of the Z columns is the same.

9. The method of any of claims 1 to 8, wherein the initial frequency domain vectors for the Z columns correspond to two group priorities; corresponding to the z-th columnAmong the initial frequency-domain vectors, the frequency-domain vector belonging to the high group priority is +.>The number of the two-dimensional space-saving type,the frequency domain vector belonging to the low group priority is +.>A plurality of; alternatively, the frequency domain vector belonging to the high group priority is +.>Frequency domain vector belonging to low group priority is +.>A plurality of; wherein (1)> And->Is an integer.

10. The method of any of claims 1 to 8, wherein the initial frequency domain vectors for the Z columns correspond to three group priorities; corresponding to the z-th columnAmong the initial frequency-domain vectors, the frequency-domain vector belonging to the highest group priority is +. >Frequency domain vectors belonging to higher group priority are +.>The frequency domain vector belonging to the lowest group priority is +.>A plurality of; alternatively, the frequency domain vector belonging to the highest group priority is +.>The frequency domain vector belonging to the higher group priority is +.>The frequency domain vector belonging to the lowest group priority is +.>And a plurality of the above-mentioned components, wherein,and->Is an integer.

11. The method according to any of claims 1 to 10, wherein the first indication information is carried in a channel state information, CSI, report.

12. The method of claim 11, wherein the CSI report further comprises a length ofIs a bitmap of (2); wherein L represents the number of spatial vectors used for constructing the precoding matrix, M ^z Representing the number of frequency domain vectors used to construct the z-th column of the precoding matrix, the bitmap indicating whether a space-frequency vector pair corresponding to each column is selected for constructing the precoding matrix, the space-frequency vector pair corresponding to the z-th column being composed of L space-frequency vectors and M ^z Combining the frequency domain vectors to obtain; l is greater than or equal to 1, M ^z 1 or more, and L and M ^z Are integers.

13. A method for reporting channel state information CSI, comprising:

receiving first indication information, wherein the first indication information is used for indicating M frequency domain vectors, and the M frequency domain vectors are used for constructing a precoding matrix of one or more frequency domain units; the precoding matrix of each frequency domain unit comprises Z columns, a Z-th column in the Z columns is constructed based on a frequency domain vector corresponding to the Z-th column in the M frequency domain vectors, and the frequency domain vector corresponding to the Z-th column is determined from an initial frequency domain vector corresponding to the Z-th column; the initial frequency domain vector corresponding to each column comprises one or more groups of initial frequency domain vectors, each group of initial frequency domain vectors corresponds to one group of priorities, and each initial frequency domain vector corresponding to each column corresponds to one column of priorities; the M frequency domain vectors are determined from predetermined initial frequency domain vectors based on a column priority corresponding to each of the Z columns and a group priority of one or more groups of initial frequency domain vectors corresponding to each column; wherein M is more than or equal to 1, Z is more than or equal to 1 and less than or equal to Z, Z is more than or equal to 1, and M, Z and Z are integers;

And determining the M frequency domain vectors according to the first indication information.

14. The method of claim 13, wherein when the initial frequency-domain vector for each column comprises a plurality of sets of initial frequency-domain vectors, the set priorities of the plurality of sets of initial frequency-domain vectors are different from each other.

15. The method of claim 13 or 14, wherein the column priorities of the Z columns are different from each other.

16. The method of any of claims 13 to 15, wherein the initial frequency-domain vectors for the Z columns include T sets of initial frequency-domain vectors corresponding to T sets of priorities, the initial frequency-domain vectors for each column belonging to one or more of the T sets of initial frequency-domain vectors in order of higher-to-lower set priorities; and, the same set of initial frequency-domain vectors includes initial frequency-domain vectors corresponding to one or more of the Z column priorities; wherein T is more than or equal to 1 and is an integer.

17. The method of claim 15 or 16, wherein the M frequency domain vectors are used to construct a precoding matrix for one or more frequency domain units, Z columns in the precoding matrix corresponding to Z transmission layers, and a column priority of the Z columns decreases with increasing sequence number of the corresponding transmission layer.

18. The method of claim 15 or 16, wherein the method further comprises:

and receiving second indication information, wherein the second indication information is used for indicating the column priority orders of the Z columns, and the column priority orders of the Z columns are determined from a plurality of predefined column priority orders.

19. The method of claim 16, wherein the method further comprises:

receiving third indication information, wherein the third indication information is used for indicating: the column corresponding to the initial frequency domain vector which is not reported in the initial frequency domain vector corresponding to the same group priority.

20. The method of claim 18 or 19, wherein the number of initial frequency domain vectors corresponding to any two of the Z columns is the same.

21. The method of any of claims 13 to 20, wherein the initial frequency domain vectors for the Z columns correspond to two group priorities; corresponding to the z-th columnAmong the initial frequency-domain vectors, the frequency-domain vector belonging to the high group priority is +.>Frequency domain vector belonging to low group priority is +.>A plurality of; alternatively, the frequency domain vector belonging to the high group priority is +.>Frequency domain vector belonging to low group priority is +. >A plurality of; wherein (1)>Not less than 1, and->Is an integer.

22. The method of any of claims 13 to 20, wherein the initial frequency domain vectors for the Z columns correspond to three group priorities; corresponding to the z-th columnAmong the initial frequency-domain vectors, the frequency-domain vector belonging to the highest group priority is +.>Frequency domain vectors belonging to higher group priority are +.>The frequency domain vector belonging to the lowest group priority is +.>A plurality of; alternatively, the frequency domain vector belonging to the highest group priority is +.>The frequency domain vector belonging to the higher group priority is +.>The frequency domain vector belonging to the lowest group priority is +.>And (3) wherein->And->Is an integer.

23. The method according to any of claims 14 to 22, wherein the first indication information is carried in a channel state information, CSI, report.

24. The method of claim 23, wherein the CSI report further comprises a length ofIs a bitmap of (2); wherein L represents the number of spatial vectors used for constructing the precoding matrix, M ^z Representing the number of frequency domain vectors used to construct the z-th column of the precoding matrix, the bitmap indicating whether a space-frequency vector pair corresponding to each column is selected for constructing the precoding matrix, the space-frequency vector pair corresponding to the z-th column being composed of L space-frequency vectors and M ^z Combining the frequency domain vectors to obtain; l is greater than or equal to 1, M ^z 1 or more, and L and M ^z Are integers.

25. A communication device comprising means for performing the method of any one of claims 1 to 12 or means for performing the method of any one of claims 13 to 24.

26. A communication device comprising at least one processor for executing a computer program stored in a memory to cause the communication device to implement the method of any one of claims 1 to 12 or to cause the communication device to implement the method of any one of claims 13 to 24.

27. 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 to 12 or causes the computer to perform the method of any one of claims 13 to 24.