Base feedback method and apparatus

Abstract

A base feedback method and apparatus, relating to the technical field of communications, and used to implement an effective solution for feeding back a weighting coefficient matrix under a non-DFT base. In the present application, when reporting a space domain feature base and a frequency domain feature base (or a space-frequency feature base), by means of decomposing the space domain feature base and the frequency domain feature base into a space domain base and a frequency domain base (or decomposing the space-frequency feature base into a space-frequency base), and by means of reporting a weighting matrix obtained by decomposition, separately indicating the space domain feature base and the frequency domain feature base (or the space-frequency feature base); associating a priority level of a reported weighting coefficient with a sequence number of the space domain base, a sequence number of the frequency domain base, and a sequence number of the space domain feature base and the frequency domain feature base. In addition, the present application ensures, as much as possible, that a coefficient having a relatively high amplitude has a higher priority level, i.e., is preferentially fed back, and a coefficient having a relatively low amplitude is preferentially discarded, so as to ensure reporting precision is ensured and improve system performance.

Description

A substrate feedback method and device

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of the People's Republic of China on September 28, 2023, with application number 202311283262.9 and application name "A Substrate Feedback Method and Device", the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of communication technology, and in particular to a substrate feedback method and device. Background Art

[0004] In fifth-generation (5G) communication systems, the application of massive multiple-input multiple-output (MIMO) technology plays a crucial role in improving the system's spectral efficiency. When using MIMO technology, the base station relies on channel state information (CSI) fed back by the terminal device to precode the data before sending it to the terminal. Accurate CSI is a key factor affecting system performance.

[0005] CSI includes information such as channel quality indicator (CQI), precoding matrix indicator (PMI), and rank indication (RI). The PMI that needs to be fed back includes the position of the non-zero coefficients in the weighting coefficient matrix and the amplitude phase of the non-zero coefficients. When the terminal uses the communication standard version 16 (release 16, R16) codebook or the communication standard version 17 (release 17, R17) codebook to feedback PMI, each weighting coefficient corresponds to a spatial domain basis and a frequency domain basis. The spatial domain basis and the frequency domain basis are both DFT vectors. In this technology, the fewer the number of non-zero coefficients in the weighting coefficient matrix fed back, the lower the feedback overhead.

[0006] Currently, reducing the non-zero coefficients in feedback to reduce feedback overhead is considered. Decomposing the precoding matrix into non-DFT basis, such as spatial and frequency domain feature basis, can be a non-DFT basis obtained by the terminal device based on historical channel statistics. The weighted coefficients obtained statistically in this non-DFT basis have lower feedback overhead.

[0007] However, there is currently no effective way to feed back the weighting coefficient matrix in a non-DFT basis.

[0008] Summary of the Invention

[0009] The embodiments of the present application provide a basis feedback method and apparatus for implementing an effective method for feeding back a weighting coefficient matrix under a non-DFT basis.

[0010] In a first aspect, an embodiment of the present application provides a basis feedback method, comprising: receiving a reference signal from an access network device, wherein the reference signal is used to indicate a spatial feature basis and a frequency feature basis used for feedback by a terminal device; sending a first indication information to the access network device, wherein the first indication information is used to indicate a first weighting coefficient matrix and a second weighting coefficient matrix; a weighted sum of the first weighting coefficient matrix and 2L′ spatial basis in a spatial basis set is used to determine K s The second weighting coefficient matrix and the M in the frequency domain basis set υ The weighted sum of the ' frequency domain bases is used to determine K f frequency domain characteristic basis; the reporting priority of multiple non-zero first weighting coefficients in the first weighting coefficient matrix is ​​related to the serial number of the spatial domain basis associated with the non-zero first weighting coefficient and the serial number of the spatial domain characteristic basis associated with the first non-zero weighting coefficient; the reporting priority of multiple non-zero second weighting coefficients in the second weighting coefficient matrix is ​​related to the serial number of the frequency domain basis associated with the non-zero second weighting coefficient and the serial number of the frequency domain characteristic basis associated with the non-zero second weighting coefficient.

[0011] In this application, the spatial domain basis and frequency domain basis differ from the spatial domain feature basis and frequency domain feature basis in that the spatial domain basis can be a DFT vector, a conjugate transpose vector of a DFT vector, or an oversampled DFT vector. The frequency domain basis can be a DFT vector, a conjugate transpose vector of a DFT vector, or an oversampled DFT vector. For example, both the spatial domain basis and the frequency domain basis can be DFT vectors; or both the spatial domain basis and the frequency domain basis can be oversampled DFT vectors; or the spatial domain basis can be a DFT vector and the frequency domain basis can be an oversampled DFT vector; or, the spatial domain basis can be an oversampled DFT vector and the frequency domain basis can be a DFT vector.

[0012] It can be understood that the first weighting coefficient matrix includes 2L′K s The first weighting coefficient, 2L′K s Each of the first weighting coefficients is associated with K s One of the spatial feature bases and one of the 2L′ spatial bases, the first weighting coefficient can be expressed as C s (i,k 1), i represents the sequence number of the selected spatial basis, k 1 Indicates the sequence number of the spatial feature basis, i = 0, 1, ..., 2L-1; k 1 =0,1,…,K s -1.2L′*K s The weighted sum of the first weighted coefficients and the 2L′ spatial bases can determine K s The weighted coefficient used in the weighted sum of 2L′ spatial feature bases is the first weighted coefficient. The second weighted coefficient matrix includes M υ ′*K f The second weighting coefficient, M υ ′*K f Each of the second weighting coefficients is associated with K f One of the frequency domain feature bases and M υ One of the frequency domain bases M υ ′*K f The second weighting coefficient and M υ The weighted sum of the ' frequency domain bases can determine K f Frequency domain feature basis. M υ The weighted coefficient used in the weighted sum of the frequency domain bases is the second weighting coefficient. The first weighting coefficient can be expressed as C f (f,k 2 ), f represents the sequence number of the selected frequency domain basis, k 2 Indicates the serial number of the frequency domain feature basis, f=0,1,…,M υ -1,k 2 =0,1,…,K f -1.

[0013] In an embodiment of the present application, when reporting the spatial characteristic basis and the frequency domain characteristic basis, the spatial characteristic basis and the frequency domain characteristic basis are decomposed into the spatial characteristic basis and the frequency domain basis, and the spatial characteristic basis and the frequency domain characteristic basis are respectively indicated by reporting the weighting coefficients obtained by the decomposition, and the sequence number of the spatial basis, the sequence number of the frequency domain basis, and the sequence number of the spatial characteristic basis and the frequency domain characteristic basis are associated with the priority of reporting the weighting coefficients, thereby providing an effective way to indicate the spatial characteristic basis and the frequency domain characteristic basis.

[0014] In one possible design, coefficients with larger amplitudes have higher reporting priorities.

[0015] In one possible design, the first indication information includes at least J information bit groups out of N information bit groups, where N is a positive integer and J is a positive integer less than or equal to N;

[0016] The nth information bit group in the N information bit groups includes K sn The information bits and K of the non-zero first weighted coefficients corresponding to the spatial feature basis fn The information bits of the non-zero second weighting coefficients corresponding to the spatial feature basis; or,

[0017] The nth information bit group in the N information bit groups includes l n The information bits and m of the non-zero first weighting coefficients corresponding to the spatial basis n The information bits of the non-zero second weighting coefficients corresponding to the spatial feature basis; or,

[0018] The nth information bit group in the N information bit groups includes N sn The information bits of the non-zero first weighting coefficients and N fn information bits of a non-zero second weighting coefficient; or N s represents the total number of non-zero weight coefficients included in the first weight coefficient matrix, N f represents the total number of non-zero weighting coefficients included in the second weighting coefficient matrix.

[0019] In one possible design, when n=1,2,…N-1, When n=N, or,

[0020] When n=1,2,…N-1, When n=N, or,

[0021] When n=1,2,…N-1, When n=N,

[0022] In one possible design, each of the N information bit groups includes a spatial domain information bit group and a frequency domain information bit group; a reporting priority of the spatial domain information bit group in each information bit group is higher than a reporting priority of the frequency domain information bit group in each information bit group, or a reporting priority of the frequency domain information bit group in each information bit group is higher than a reporting priority of the spatial domain information bit group in each information bit group;

[0023] The nth spatial information bit group includes K snThe information bits of the non-zero first weighted coefficients corresponding to the spatial feature basis, the nth frequency domain information bit group includes K fn information bits of the non-zero second weighting coefficients corresponding to the frequency domain feature basis; or,

[0024] The nth spatial information bit group includes l n The information bits of the non-zero first weighting coefficient corresponding to the spatial basis, the nth frequency domain information bit group includes m n The information bits of the non-zero second weighting coefficients corresponding to the spatial feature basis; or

[0025] The nth spatial information bit group includes N sn The nth frequency domain information bit group includes N fn The information bits of the non-zero second weighting coefficients.

[0026] The above design adopts a grouping method for reporting, and the spatial domain correlation coefficient and the frequency domain correlation coefficient are reported in groups respectively. When reporting resources are insufficient, the latter groups (ie, groups with lower priority) can be abandoned to improve reporting accuracy.

[0027] In one possible design, sending the first indication information to the access network device includes:

[0028] When the reported resource amount of the terminal device is greater than or equal to the resource amount of the N information bit groups, sending the N information bit groups to the access network device; or,

[0029] When the reported resource amount of the terminal device is less than the resource amount of the N information bit groups, sending the first information bit group to the Jth information bit group in the N information bit groups to the access network device according to the reported resource amount; or

[0030] When the reported resource amount of the terminal device is less than the resource amount of the N information bit groups, the 1st information bit group to the Jth information bit group and part of the information bits of the J+1th information bit group are sent to the access network device according to the reported resource amount.

[0031] In the above design, the reporting is performed in a grouping manner. When reporting resources are insufficient, the subsequent groups (ie, groups with lower priorities) can be abandoned to improve the reporting accuracy and thus improve the system performance.

[0032] In one possible design, the reporting priority of the multiple non-zero first weighting coefficients included in the first weighting coefficient matrix satisfies: Pri s (i,k 1 )=2L′k 1 +i; or, Pris (i,k 1 )=K s i+k 1 ;

[0033] Where i represents the sequence number of the selected spatial basis, k 1 represents the sequence number of the spatial feature basis, i = 0, 1, ..., 2L'-1; k 1 =0,1,…,K s -1;Pri s (i,k 1 ) represents the priority of the non-zero first weighting coefficient of the spatial basis of the associated sequence number i and the spatial feature basis of the sequence number k.

[0034] In the above design, Pri s (i,k 1 ) value indicates the priority, that is, the larger the priority value, the higher the priority.

[0035] In one possible design, the reporting priority of the multiple non-zero second weighting coefficients included in the second weighting coefficient matrix satisfies: Pri f (f,k 2 )=M υ ′k 2 +π′(f); or, Pri f (f,k 2 )=K f π′(f)+k 2 or, Pri f (f,k 2 )=M υ ′k 2 +f; or, Pri f (f,k 2 )=K f f+k 2 ;

[0036] in, f represents the sequence number of the selected frequency domain basis, k 2 Indicates the serial number of the frequency domain feature basis, f = 0, 1, ..., M υ -1,k 2 =0,1,…,K f -1;Pri f (f,k 2 ) represents the frequency domain basis of the associated sequence number f and the sequence number k 2 The priority of the non-zero second weighting coefficient of the frequency domain feature basis; N3 represents the total number of the frequency domain basis, Represents the sequence number of the frequency domain basis of sequence number f in the N3 frequency domain basis.

[0037] In the above design, Pri f (f,k 2 ) value indicates the priority, that is, the larger the priority value, the higher the priority.

[0038] In one possible design, the method further includes:

[0039] Sending second indication information to the access network device, where the second indication information includes a first bitmap and a second bitmap;

[0040] The first bitmap is used to indicate the positions of the multiple non-zero first weighting coefficients in the first weighting coefficient matrix, and the second bitmap is used to indicate the positions of the multiple non-zero second weighting coefficients in the second weighting coefficient matrix.

[0041] In the above design, only non-zero weighting coefficients are reported, and the positions of the reported non-zero weighting coefficients in the weighting coefficient matrix are represented by a bit map to obtain the weighting coefficient matrix.

[0042] In one possible design, the non-zero weighted coefficients that are abandoned in reporting due to insufficient resources may not be reflected in the bit map, but may also be indicated currently.

[0043] In one possible design, the first indication information includes the first weighting coefficient matrix except K s The information bits of multiple non-zero first weighting coefficients other than the maximum non-zero first weighting coefficient corresponding to the spatial feature basis, and the information bits of the second weighting coefficient matrix except K f information bits of multiple non-zero second weighting coefficients other than the maximum non-zero second weighting coefficient corresponding to the frequency domain feature basis;

[0044] The information bits of the non-zero first weighting coefficients corresponding to the first spatial feature basis in the first weighting coefficient matrix are obtained by normalizing multiple non-zero first weighting coefficients corresponding to the first spatial feature basis based on the maximum non-zero first weighting coefficient corresponding to the first spatial feature basis; the first spatial feature basis is K s Any one of the spatial feature bases;

[0045] The information bits of the non-zero second weighting coefficients corresponding to the first frequency domain characteristic basis in the second weighting coefficient matrix are obtained by normalizing the multiple non-zero second weighting coefficients corresponding to the first frequency domain characteristic basis based on the maximum non-zero second weighting coefficient corresponding to the first frequency domain characteristic basis; the first frequency domain characteristic basis is K f Any frequency domain feature basis among the frequency domain feature basis.

[0046] In the above design, the weighting coefficient is normalized before reporting, and the maximum non-zero weighting coefficient of the spatial / frequency domain feature basis referenced by the normalization process is no longer reported, which can further reduce the reporting overhead.

[0047] In one possible design, sending the first indication information to the access network device includes:

[0048] Periodically sending the first indication information to the access network device according to a first reporting period;

[0049] The method further comprises:

[0050] Periodically sending third indication information to the access network device according to a second reporting period, where the third indication information is used to indicate a third weighting coefficient matrix;

[0051] The third weighting coefficient matrix and the K s The spatial feature basis and the K f The weighted sum of the frequency domain feature bases is used to determine the precoding matrix;

[0052] The first reporting period is greater than the second reporting period.

[0053] In some embodiments, the third weighting coefficient matrix and the K s The spatial feature basis and the K f The weighted sum of the frequency domain feature bases is used to determine the precoding matrix, which can also be the sum of the third weighting coefficient matrix and the K s The spatial feature basis and the K f The weighted sum of the frequency domain feature bases is used to determine the channel matrix H.

[0054] In a second aspect, an embodiment of the present application provides a substrate feedback method, comprising:

[0055] Receiving a reference signal from an access network device, where the reference signal is used to indicate a space-frequency characteristic basis used by a terminal device for feedback;

[0056] Sending fourth indication information to the access network device, where the fourth indication information is used to indicate a fourth weighting coefficient matrix;

[0057] Among them, the fourth weighted coefficient matrix and G sf The weighted sum of the space-frequency bases is used to determine K sf a space-frequency characteristic basis; the reporting priority of multiple non-zero fourth weighting coefficients included in the fourth weighting coefficient matrix is ​​related to the serial number of the space-frequency basis associated with the non-zero fourth weighting coefficient and the serial number of the space-frequency characteristic basis associated with the non-zero fourth weighting coefficient.

[0058] The difference between the spatial domain basis and the space-frequency feature basis in the present application is that the space-frequency basis can be a DFT vector, a conjugate transposed vector of a DFT vector, or an oversampled DFT vector.

[0059] For example, the fourth weighting coefficient matrix can be understood as K sf Each space-frequency feature basis is decomposed into G sf obtained on a space-frequency basis.

[0060] Exemplarily, the fourth weighting coefficient matrix includes G sf K sf The fourth weighting coefficient, G sf K sf Each of the fourth weighting coefficients is associated with K sf One of the space-frequency characteristic bases and G sf The fourth weighting coefficient can be expressed as C sf (i,f,k 3 ), i represents the sequence number of the spatial domain basis corresponding to the selected space-frequency basis, f represents the sequence number of the frequency domain basis corresponding to the selected space-frequency basis, k 3 Indicates the serial number of the space-frequency feature basis, i = 0, 1, ..., 2L "-1, f = 0, 1, ..., M υ ″-1,k 3 =0,1,…,K sf -1.

[0061] In an embodiment of the present application, when reporting the space-frequency characteristic base, the space-frequency characteristic base is decomposed into the space-frequency base, and the space-frequency characteristic base is indicated respectively by reporting the weighted coefficients obtained by the decomposition, and the priority of reporting the weighted coefficients is associated with the sequence number of the space-frequency base and the sequence number of the space-frequency characteristic base, thereby providing an effective way to indicate the space-frequency characteristic base.

[0062] In one possible design, coefficients with larger amplitudes have higher reporting priorities.

[0063] In one possible design, the fourth indication information includes at least J information bit groups out of N information bit groups, where N is a positive integer and J is a positive integer less than or equal to N;

[0064] The nth information bit group in the N information bit groups includes K sfn The information bits of the non-zero fourth weighting coefficient corresponding to the space-frequency feature basis, or

[0065] The nth information bit group in the N information bit groups includes N sfninformation bits of a non-zero fourth weighting coefficient, N sf represents the total number of non-zero fourth weighting coefficients included in the fourth weighting coefficient matrix.

[0066] In one possible design, when n=1,2,…N-1, When n=N, or,

[0067] When n=1,2,…N-1, When n=N,

[0068] In one possible design, sending fourth indication information to the access network device includes:

[0069] When the reported resource amount of the terminal device is greater than or equal to the resource amount of the N information bit groups, sending the N information bit groups to the access network device; or,

[0070] When the reported resource amount of the terminal device is less than the resource amount of the N information bit groups, sending the first information bit group to the Jth information bit group in the N information bit groups to the access network device according to the reported resource amount; or

[0071] When the reported resource amount of the terminal device is less than the resource amount of the N information bit groups, the 1st information bit group to the Jth information bit group and part of the information bits of the J+1th information bit group are sent to the access network device according to the reported resource amount.

[0072] In one possible design, sending fourth indication information to the access network device includes:

[0073] When the reported resource amount of the terminal device is less than the resource amount of the information bits of the non-zero fourth weighting coefficients in the fourth weighting coefficient matrix, the information bits of some non-zero fourth weighting coefficients in the fourth weighting coefficient matrix are sent to the access network device according to the reported resource amount, the resource amount of the information bits of the some non-zero fourth weighting coefficients meets the reported resource amount of the terminal device, and the reporting priority of the some non-zero fourth weighting coefficients is higher than the reporting priority of the non-zero fourth weighting coefficients in the fourth weighting coefficient matrix except the some non-zero fourth weighting coefficients; or,

[0074] When the reported resource amount of the terminal device is less than the resource amount of the information bit of the non-zero fourth weighting coefficient in the fourth weighting coefficient matrix, the information bit of the non-zero fourth weighting coefficient corresponding to the partial space-frequency characteristic basis in the fourth weighting coefficient matrix is ​​sent to the access network device according to the reported resource amount; the partial space-frequency characteristic basis is the K sfn The space-frequency feature basis with a sequence number less than g in the space-frequency feature basis.

[0075] In one possible design, the reporting priorities of the multiple non-zero fourth weighting coefficients included in the fourth weighting coefficient matrix satisfy: Pri sf (i,f,k 3 )=2L″k 3 π′(f)+2L″k+i; or, Pri(i,f,k 3 )=2L″N3k 3 +2L″π′(f)+i;

[0076] in, G sf The space-frequency basis is composed of 2L″ space-domain basis and M υ 2L″M generated by a frequency domain basis υ "Part or all of the space-frequency basis, i represents the sequence number of the spatial domain basis corresponding to the selected space-frequency basis, f represents the sequence number of the frequency domain basis corresponding to the selected space-frequency basis, k 3 Indicates the serial number of the space-frequency feature basis, i = 0, 1, ..., 2L "-1, f = 0, 1, ..., M υ ″-1,k 3 =0,1,…,K sf -1; Pri(i,f,k 3 ) represents the frequency domain basis of the associated sequence number f, sequence number k 3 The priority of the non-zero fourth weighting coefficient of the spatial frequency feature basis and the spatial domain basis of sequence number i, N3 represents the total number of the frequency domain basis, Represents the sequence number of the frequency domain basis of sequence number f in the N3 frequency domain basis.

[0077] In one possible design, sending fourth indication information to the access network device includes:

[0078] Periodically sending the fourth indication information to the access network device according to the first reporting period;

[0079] The method further comprises:

[0080] Periodically sending fifth indication information to the access network device according to a second reporting period, where the fifth indication information is used to indicate a fifth weighting coefficient matrix;

[0081] The fifth weighting coefficient matrix and the K sf The weighted sum of the space-frequency feature bases is used to determine the precoding matrix;

[0082] The first reporting period is greater than the second reporting period.

[0083] In a third aspect, an embodiment of the present application provides a substrate feedback method, comprising:

[0084] Sending a reference signal to a terminal device, where the reference signal is used to indicate a spatial domain feature basis and a frequency domain feature basis used for feedback by the terminal device;

[0085] Receiving first indication information from the terminal device, where the first indication information is used to indicate a first weighting coefficient matrix and a second weighting coefficient matrix;

[0086] The weighted sum of the first weighting coefficient matrix and the 2L′ spatial basis in the spatial basis set is used to determine K s The second weighting coefficient matrix and the M in the frequency domain basis set υ The weighted sum of the ' frequency domain bases is used to determine K f frequency domain feature basis;

[0087] The reporting priority of multiple non-zero first weighting coefficients in the first weighting coefficient matrix is ​​related to the serial number of the spatial domain basis associated with the non-zero first weighting coefficient and the serial number of the spatial domain characteristic basis associated with the first non-zero weighting coefficient; the reporting priority of multiple non-zero second weighting coefficients in the second weighting coefficient matrix is ​​related to the serial number of the frequency domain basis associated with the non-zero second weighting coefficient and the serial number of the frequency domain characteristic basis associated with the non-zero second weighting coefficient.

[0088] In one possible design, the first indication information includes at least J information bit groups out of N information bit groups, where N is a positive integer and J is a positive integer less than or equal to N;

[0089] The nth information bit group in the N information bit groups includes K sn The information bits and K of the non-zero first weighted coefficients corresponding to the spatial feature basis fn The information bits of the non-zero second weighting coefficients corresponding to the spatial feature basis; or,

[0090] The nth information bit group in the N information bit groups includes l n The information bits and m of the non-zero first weighting coefficients corresponding to the spatial basis n The information bits of the non-zero second weighting coefficients corresponding to the spatial feature basis; or,

[0091] The nth information bit group in the N information bit groups includes N sn The information bits of the non-zero first weighting coefficients and N fn information bits of a non-zero second weighting coefficient; or N s represents the total number of non-zero weight coefficients included in the first weight coefficient matrix, N f represents the total number of non-zero weighting coefficients included in the second weighting coefficient matrix.

[0092] In one possible design, when n=1,2,…N-1, When n=N, or,

[0093] When n=1,2,…N-1, When n=N, or,

[0094] When n=1,2,…N-1, When n=N,

[0095] In one possible design, each of the N information bit groups includes a spatial domain information bit group and a frequency domain information bit group; a reporting priority of the spatial domain information bit group in each information bit group is higher than a reporting priority of the frequency domain information bit group in each information bit group, or a reporting priority of the frequency domain information bit group in each information bit group is higher than a reporting priority of the spatial domain information bit group in each information bit group;

[0096] The nth spatial information bit group includes K sn The information bits of the non-zero first weighted coefficients corresponding to the spatial feature basis, the nth frequency domain information bit group includes K fn information bits of the non-zero second weighting coefficients corresponding to the frequency domain feature basis; or,

[0097] The nth spatial information bit group includes l n The information bits of the non-zero first weighting coefficient corresponding to the spatial basis, the nth frequency domain information bit group includes m n The information bits of the non-zero second weighting coefficients corresponding to the spatial feature basis; or

[0098] The nth spatial information bit group includes N snThe nth frequency domain information bit group includes N fn The information bits of the non-zero second weighting coefficients.

[0099] In one possible design, receiving first indication information from a terminal device includes:

[0100] When the amount of resources reported by the terminal device is greater than or equal to the amount of resources of the N information bit groups, receiving the N information bit groups from the terminal device; or,

[0101] When the amount of resources reported by the terminal device is less than the amount of resources of the N information bit groups, receiving the first information bit group to the Jth information bit group of the N information bit groups from the terminal device; or

[0102] When the reported resource amount of the terminal device is less than the resource amount of the N information bit groups, the 1st information bit group to the Jth information bit group and part of the information bits of the J+1th information bit group are received from the terminal device.

[0103] In one possible design, the reporting priority of the multiple non-zero first weighting coefficients included in the first weighting coefficient matrix satisfies: Pri s (i,k 1 )=2L′k 1 +i; or, Pri s (i,k 1 )=K s i+k 1 ;

[0104] Where i represents the sequence number of the selected spatial basis, k 1 represents the sequence number of the spatial feature basis, i = 0, 1, ..., 2L'-1; k 1 =0,1,…,K s -1;Pri s (i,k 1 ) represents the priority of the non-zero first weighting coefficient of the spatial basis of the associated sequence number i and the spatial feature basis of the sequence number k.

[0105] In the above design, Pri s (i,k 1 ) value indicates the priority, that is, the larger the priority value, the higher the priority.

[0106] In one possible design, the reporting priority of the multiple non-zero second weighting coefficients included in the second weighting coefficient matrix satisfies: Pri f (f,k 2 )=Mυ ′k 2 +π′(f); or, Pri f (f,k 2 )=K f π′(f)+k 2 or, Pri f (f,k 2 )=M υ ′k 2 +f; or, Pri f (f,k 2 )=K f f+k 2 ;

[0107] in, f represents the sequence number of the selected frequency domain basis, k 2 Indicates the serial number of the frequency domain feature basis, f = 0, 1, ..., M υ -1,k 2 =0,1,…,K f -1;Pri f (f,k 2 ) represents the frequency domain basis of the associated sequence number f and the sequence number k 2 The priority of the non-zero second weighting coefficient of the frequency domain feature basis; N3 represents the total number of the frequency domain basis, Represents the sequence number of the frequency domain basis of sequence number f in the N3 frequency domain basis.

[0108] In one possible design, the method further includes:

[0109] receiving second indication information from the terminal device, where the second indication information includes a first bitmap and a second bitmap;

[0110] The first bitmap is used to indicate the positions of the multiple non-zero first weighting coefficients in the first weighting coefficient matrix, and the second bitmap is used to indicate the positions of the multiple non-zero second weighting coefficients in the second weighting coefficient matrix.

[0111] In one possible design, the first indication information includes the first weighting coefficient matrix except K s The information bits of multiple non-zero first weighting coefficients other than the maximum non-zero first weighting coefficient corresponding to the spatial feature basis, and the information bits of the second weighting coefficient matrix except K f information bits of multiple non-zero second weighting coefficients other than the maximum non-zero second weighting coefficient corresponding to the frequency domain feature basis;

[0112] The information bits of the non-zero first weighting coefficients corresponding to the first spatial feature basis in the first weighting coefficient matrix are obtained by normalizing multiple non-zero first weighting coefficients corresponding to the first spatial feature basis based on the maximum non-zero first weighting coefficient corresponding to the first spatial feature basis; the first spatial feature basis is K s Any one of the spatial feature bases;

[0113] The information bits of the non-zero second weighting coefficients corresponding to the first frequency domain characteristic basis in the second weighting coefficient matrix are obtained by normalizing the multiple non-zero second weighting coefficients corresponding to the first frequency domain characteristic basis based on the maximum non-zero second weighting coefficient corresponding to the first frequency domain characteristic basis; the first frequency domain characteristic basis is K f Any frequency domain feature basis among the frequency domain feature basis.

[0114] In one possible design, receiving first indication information from a terminal device includes:

[0115] Periodically receiving the first indication information from the terminal device according to a first reporting period;

[0116] The method further comprises:

[0117] Periodically receiving third indication information from the terminal device according to a second reporting period, where the third indication information is used to indicate a third weighting coefficient matrix;

[0118] The third weighting coefficient matrix and the K s The spatial feature basis and the K f The weighted sum of the frequency domain feature bases is used to determine the precoding matrix;

[0119] The first reporting period is greater than the second reporting period.

[0120] In a fourth aspect, an embodiment of the present application provides a substrate feedback method, comprising:

[0121] Sending a reference signal to a terminal device, where the reference signal is used to indicate a space-frequency characteristic basis used by the terminal device for feedback;

[0122] receiving fourth indication information from the terminal device, where the fourth indication information is used to indicate a fourth weighting coefficient matrix;

[0123] Among them, the fourth weighted coefficient matrix and G sf The weighted sum of the space-frequency bases is used to determine K sfa space-frequency characteristic basis; the reporting priority of multiple non-zero fourth weighting coefficients included in the fourth weighting coefficient matrix is ​​related to the serial number of the space-frequency basis associated with the non-zero fourth weighting coefficient and the serial number of the space-frequency characteristic basis associated with the non-zero fourth weighting coefficient.

[0124] In one possible design, the fourth indication information includes at least J information bit groups out of N information bit groups, where N is a positive integer and J is a positive integer less than or equal to N;

[0125] The nth information bit group in the N information bit groups includes K sfn The information bits of the non-zero fourth weighting coefficient corresponding to the space-frequency feature basis, or

[0126] The nth information bit group in the N information bit groups includes N sfn information bits of a non-zero fourth weighting coefficient, N sf represents the total number of non-zero fourth weighting coefficients included in the fourth weighting coefficient matrix.

[0127] In one possible design, when n=1,2,…N-1, When n=N, or,

[0128] When n=1,2,…N-1, When n=N,

[0129] In one possible design, receiving fourth indication information from the terminal device includes:

[0130] When the amount of resources reported by the terminal device is greater than or equal to the amount of resources of the N information bit groups, receiving the N information bit groups from the terminal device; or,

[0131] When the amount of resources reported by the terminal device is less than the amount of resources of the N information bit groups, receiving the first information bit group to the Jth information bit group of the N information bit groups from the terminal device; or

[0132] When the reported resource amount of the terminal device is less than the resource amount of the N information bit groups, the 1st information bit group to the Jth information bit group and part of the information bits of the J+1th information bit group are received from the terminal device.

[0133] In one possible design, receiving fourth indication information from the terminal device includes:

[0134] When the reported resource amount of the terminal device is less than the resource amount of the information bits of the non-zero fourth weighting coefficients in the fourth weighting coefficient matrix, the information bits of some non-zero fourth weighting coefficients in the fourth weighting coefficient matrix are received from the terminal device, the resource amount of the information bits of the some non-zero fourth weighting coefficients meets the reported resource amount of the terminal device, and the reporting priority of the some non-zero fourth weighting coefficients is higher than the reporting priority of the non-zero fourth weighting coefficients in the fourth weighting coefficient matrix except the some non-zero fourth weighting coefficients; or,

[0135] When the reported resource amount of the terminal device is less than the resource amount of the information bit of the non-zero fourth weighting coefficient in the fourth weighting coefficient matrix, the information bit of the non-zero fourth weighting coefficient corresponding to the partial space-frequency characteristic basis in the fourth weighting coefficient matrix from the terminal device is received; the partial space-frequency characteristic basis is the K sfn The space-frequency feature basis with a sequence number less than g in the space-frequency feature basis.

[0136] In one possible design, the reporting priorities of the multiple non-zero fourth weighting coefficients included in the fourth weighting coefficient matrix satisfy: Pri sf (i,f,k 3 )=2L″k 3 π′(f)+2L″k+i; or, Pri(i,f,k 3 )=2L″N3k 3 +2L″π′(f)+i;

[0137] in, G sf The space-frequency basis is composed of 2L″ space-domain basis and M υ 2L″M″ generated by a frequency domain basis υ Part or all of the space-frequency basis, i represents the sequence number of the spatial domain basis corresponding to the selected space-frequency basis, f represents the sequence number of the frequency domain basis corresponding to the selected space-frequency basis, k 3 Indicates the serial number of the space-frequency feature basis, i = 0, 1, ..., 2L "-1, f = 0, 1, ..., M υ ″-1,k 3 =0,1,…,K sf -1; Pri(i,f,k 3 ) represents the frequency domain basis of the associated sequence number f, sequence number k 3 The priority of the non-zero fourth weighting coefficient of the spatial frequency feature basis and the spatial domain basis of sequence number i, N3 represents the total number of the frequency domain basis, Represents the sequence number of the frequency domain basis of sequence number f in the N3 frequency domain basis.

[0138] In one possible design, receiving fourth indication information from the terminal device includes:

[0139] Periodically receiving the fourth indication information from the terminal device according to the first reporting period;

[0140] The method further comprises:

[0141] Periodically receiving fifth indication information from the terminal device according to the second reporting period, where the fifth indication information is used to indicate a fifth weighting coefficient matrix;

[0142] The fifth weighting coefficient matrix and the K sf The weighted sum of the space-frequency feature bases is used to determine the precoding matrix;

[0143] The first reporting period is greater than the second reporting period.

[0144] In a fifth aspect, the present application further provides a communication device, which is a terminal device or a chip in a terminal device. The communication device has the function of implementing any of the methods provided in the first aspect above, or the function of implementing any of the methods provided in the second aspect above. The communication device can be implemented by hardware, or can be implemented by hardware executing corresponding software. The hardware or software includes one or more units or modules corresponding to the above functions.

[0145] In one possible design, the communication device includes a processor configured to support the communication device in executing the corresponding functions of the terminal device in the method described above. The communication device may also include a memory, which may be coupled to the processor and stores program instructions and data necessary for the communication device. Optionally, the communication device also includes an interface circuit for supporting communication between the communication device and equipment such as a service satellite, such as the transmission and reception of data or signals. Exemplarily, the communication interface may be a transceiver, circuit, bus, module, or other type of communication interface.

[0146] In one possible design, the communication device includes corresponding functional modules for implementing the steps in the above method. The functions can be implemented by hardware or by hardware executing corresponding software implementations. The hardware or software includes one or more modules corresponding to the above functions.

[0147] In one possible design, the structure of the communication device includes a processing unit (or processing module) and a communication unit (or communication module). These units can perform the corresponding functions in the above method examples. For details, please refer to the description of the method provided in the first aspect or the second aspect, which will not be repeated here.

[0148] In a sixth aspect, the present application further provides a communication device, which is an access network device or a chip in an access network device. The communication device has the function of implementing any of the methods provided in the third aspect above or has the function of implementing any of the methods provided in the fourth aspect above. The communication device can be implemented by hardware or by hardware executing corresponding software implementations. The hardware or software includes one or more units or modules corresponding to the above functions.

[0149] In one possible design, the communication device includes a processor configured to support the communication device in performing the corresponding satellite servicing functions described in the above method. The communication device may also include a memory, which may be coupled to the processor and stores program instructions and data necessary for the communication device. Optionally, the communication device also includes an interface circuit for supporting communication between the communication device and a terminal device, such as transmitting and receiving data or signals. Exemplarily, the communication interface may be a transceiver, circuit, bus, module, or other type of communication interface.

[0150] In one possible design, the communication device includes corresponding functional modules for implementing the steps in the above method. The functions can be implemented by hardware or by hardware executing corresponding software implementations. The hardware or software includes one or more modules corresponding to the above functions.

[0151] In one possible design, the structure of the communication device includes a processing unit (or processing module) and a communication unit (or communication module). These units can perform the corresponding functions in the above method examples. For details, please refer to the description of the method provided in the third aspect or the fourth aspect, which will not be repeated here.

[0152] In the seventh aspect, a communication device is provided, comprising a processor and an interface circuit, the interface circuit being used to receive signals from other communication devices outside the communication device and transmit them to the processor or to send signals from the processor to other communication devices outside the communication device, the processor being used to implement the method in the aforementioned first aspect and any possible design through logic circuits or execution code instructions, or being used to implement the method in the aforementioned second aspect and any possible design.

[0153] In an eighth aspect, a communication device is provided, comprising a processor and an interface circuit, the interface circuit being used to receive signals from other communication devices outside the communication device and transmit them to the processor or to send signals from the processor to other communication devices outside the communication device, the processor being used to implement the method in the aforementioned third aspect and any possible design through logic circuits or execution code instructions, or being used to implement the method in the aforementioned fourth aspect and any possible design.

[0154] In the ninth aspect, a computer-readable storage medium is provided, in which a computer program or instruction is stored. When the computer program or instruction is executed by a processor, the method of the first aspect or the second aspect and any possible design is implemented.

[0155] In the tenth aspect, a computer-readable storage medium is provided, which stores a computer program or instruction. When the computer program or instruction is executed by a processor, the method of the third aspect or the fourth aspect and any possible design is implemented.

[0156] In the eleventh aspect, a computer program product storing instructions is provided, which, when executed by a processor, implements the method in the aforementioned first aspect, second aspect, third aspect, fourth aspect, and any possible design.

[0157] In a twelfth aspect, a chip system is provided, comprising a processor and possibly a memory, for implementing the methods of the first, second, third, or fourth aspects, and any possible designs. The chip system may be composed solely of a chip, or may include a chip and other discrete components.

[0158] In the thirteenth aspect, a communication system is provided, which includes the device described in the first aspect (such as a terminal device) and the device described in the third aspect (such as an access network device); or includes the device described in the second aspect (such as a terminal device) and the device described in the fourth aspect (such as an access network device).

[0159] The technical effects that can be achieved by the technical solutions in any of the above-mentioned second to thirteenth aspects can be described with reference to the technical effects that can be achieved by the technical solutions in the above-mentioned first aspect, and the repetitions will not be repeated. BRIEF DESCRIPTION OF THE DRAWINGS

[0160] FIG1 is a schematic diagram of the architecture of a communication system 1000 used in an embodiment of the present application;

[0161] FIG2 is a schematic diagram of the structure of each module included in the access network device and terminal device involved in this application;

[0162] FIG3 is a schematic flow chart of a substrate feedback method provided in an embodiment of the present application;

[0163] FIG4 is a schematic diagram of a reporting order of an information bit group provided in an embodiment of the present application;

[0164] FIG5 is a schematic diagram of another reporting order of information bit groups provided in an embodiment of the present application;

[0165] FIG6 is a flow chart of another substrate feedback method provided in an embodiment of the present application;

[0166] FIG7 is a schematic diagram of the structure of a communication device provided in an embodiment of the present application;

[0167] FIG8 is a schematic diagram of the structure of a communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0168] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

[0169] The at least one (item) involved in the embodiments of the present application as follows indicates one (item) or more (items). More (items) refers to two (items) or more than two (items). "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. In addition, it should be understood that although the terms first, second, etc. may be used to describe each object in the embodiments of the present application, these objects should not be limited to these terms. These terms are only used to distinguish each object from each other.

[0170] The terms "including" and "having" and any variations thereof mentioned in the following description of the embodiments of the present application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes other steps or units that are not listed, or optionally includes other steps or units that are inherent to these processes, methods, products or devices. It should be noted that, in the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any method or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other methods or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a concrete way.

[0171] Figure 1 is a schematic diagram of the architecture of a communication system 1000 used in an embodiment of the present application. As shown in Figure 1 , the communication system includes a radio access network 100 and a core network 200. Optionally, the communication system 1000 may also include the Internet 300. The radio access network 100 may include at least one radio access network device (such as 110a and 110b in Figure 1 ) and at least one terminal device (such as 120a-120j in Figure 1 ). The terminal device is wirelessly connected to the radio access network device, and the radio access network device is wirelessly or wiredly connected to the core network. The core network device and the radio access network device may be independent and distinct physical devices, or the functions of the core network device and the logical functions of the radio access network device may be integrated into the same physical device, or a single physical device may integrate some of the functions of the core network device and some of the functions of the radio access network device. Terminal devices and radio access network devices may be connected to each other via wired or wireless connections. FIG1 is only a schematic diagram. The communication system may further include other network devices, such as wireless relay devices and wireless backhaul devices, which are not shown in FIG1 .

[0172] Radio access network equipment is the access device that terminal devices use to wirelessly access the communication system. Radio access network equipment can be a base station, an evolved NodeB (eNodeB), a transmission reception point (TRP), a next-generation NodeB (gNB) in fifth-generation (5G) mobile communication systems, a next-generation base station in sixth-generation (6G) mobile communication systems, or a base station in future mobile communication systems. It can also be a module or unit that performs some of the functions of a base station, such as a centralized unit (CU) or a distributed unit (DU). The CU here completes the functions of the radio resource control protocol and the packet data convergence protocol (PDCP) of the base station, and can also complete the function of the service data adaptation protocol (SDAP); the DU completes the functions of the radio link control layer and the medium access control (MAC) layer of the base station, and can also complete the functions of part of the physical layer or all of the physical layer. For the specific description of each of the above protocol layers, please refer to the relevant technical specifications of the 3rd Generation Partnership Project (3GPP). The wireless access network device can be a macro base station (such as 110a in Figure 1), a micro base station or an indoor station (such as 110b in Figure 1), or a relay node or a donor node, etc. The embodiments of the present application do not limit the specific technology and specific device form adopted by the wireless access network device. For the sake of convenience of description, network equipment is referred to as the abbreviation of wireless access network equipment.

[0173] A terminal device is a device with wireless transceiver capabilities that can send signals to or receive signals from an access network device. A terminal device may also be referred to as a terminal, user equipment (UE), mobile station, mobile terminal device, etc. Terminal devices can be widely used in various scenarios, such as device-to-device (D2D), vehicle-to-everything (V2X) communication, machine-type communication (MTC), Internet of Things (IoT), virtual reality, augmented reality, industrial control, autonomous driving, telemedicine, smart grid, smart furniture, smart office, smart wearable, smart transportation, smart city, etc. A terminal device may be a mobile phone, tablet computer, computer with wireless transceiver capabilities, wearable device, vehicle, vehicle-mounted terminal, airplane, ship, robot, robotic arm, smart home device, etc. The embodiments of this application do not limit the specific technology and specific device form adopted by the terminal device.

[0174] Access network equipment and terminal devices can be fixed or mobile. They can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; on water; and on aircraft, balloons, and satellites. The embodiments of this application do not limit the application scenarios of access network equipment and terminal devices.

[0175] The roles of access network devices and terminal devices can be relative. For example, the helicopter or drone 120i in Figure 1 can be configured as a mobile access network device. For terminal devices 120j accessing the wireless access network 100 via 120i, terminal device 120i is an access network device. However, for access network device 110a, 120i is a terminal device, meaning that communication between 110a and 120i occurs via a wireless air interface protocol. Of course, communication between 110a and 120i can also occur via an interface protocol between access network devices. In this case, relative to 110a, 120i is also an access network device. Therefore, both access network devices and terminal devices can be collectively referred to as communication devices. 110a and 110b in Figure 1 can be referred to as communication devices with access network device functionality, while 120a-120j in Figure 1 can be referred to as communication devices with terminal device functionality.

[0176] Access network devices and terminal devices, access network devices and access network devices, and terminal devices and terminal devices can communicate through authorized spectrum, unauthorized spectrum, or both. They can communicate through spectrum below 6 gigahertz (GHz), spectrum above 6 GHz, or spectrum below 6 GHz and spectrum above 6 GHz. The embodiments of this application do not limit the spectrum resources used for wireless communications.

[0177] In an embodiment of the present application, the functions of the access network device may also be performed by a module (such as a chip) in the access network device, or by a control subsystem that includes the functions of the access network device. The control subsystem that includes the functions of the access network device here may be a control center in the above-mentioned application scenarios such as smart grid, industrial control, intelligent transportation, and smart city. The functions of the terminal device may also be performed by a module (such as a chip or a modem) in the terminal device, or by a device that includes the functions of the terminal device. In the present application, the access network device sends a downlink signal or downlink information to the terminal device, and the downlink information is carried on a downlink channel; the terminal device sends an uplink signal or uplink information to the access network device, and the uplink information is carried on an uplink channel. In order to communicate with the access network device, the terminal device needs to establish a wireless connection with the cell controlled by the access network device. The cell that has established a wireless connection with the terminal device is called the service cell of the terminal device. When the terminal device communicates with the service cell, it will also be interfered with by signals from neighboring cells.

[0178] As shown in Figure 2, it is a schematic diagram of the structure of each module included in the access network equipment and terminal equipment involved in this application. Among them, radio resource control (RRC) signaling interaction module: a module used by the access network equipment and the terminal equipment to send and receive RRC signaling. Medium access control (MAC) signaling interaction module: a module used by the access network equipment and the terminal equipment to send and receive media access control-control element (MAC control element, MAC-CE) signaling. Physical layer (PHY) signaling and data interaction module: a module used by the access network equipment and the terminal equipment to send and receive uplink / downlink control signaling, and uplink / downlink data.

[0179] It can be understood that in the embodiments of the present application, the physical downlink shared channel (PDSCH), physical downlink control channel (PDCCH), physical uplink control channel (PUCCH) and physical uplink shared channel (PUSCH) are only used as examples of downlink data channels, downlink control channels, uplink control channels and uplink data channels, respectively. In different systems and different scenarios, data channels and control channels may have different names, and the embodiments of the present application do not limit this.

[0180] To facilitate understanding of the embodiments of the present application, several basic concepts involved in the embodiments of the present application are briefly explained.

[0181] 1) Precoding Matrix Indicator (PMI): This can be used to indicate the precoding matrix. The precoding matrix can be, for example, a precoding matrix determined by the terminal device based on the channel matrix of each frequency domain unit. The channel matrix can be determined by the terminal device through channel estimation or other methods, or based on channel reciprocity. However, it should be understood that the specific method for determining the precoding matrix by the terminal device is not limited to that described above. Specific implementation methods can refer to existing technologies and are not listed here for the sake of brevity.

[0182] For example, the precoding matrix can be obtained by performing singular value decomposition (SVD) on the channel matrix or the covariance matrix of the channel matrix, or by performing eigenvalue decomposition (EVD) on the covariance matrix of the channel matrix. It should be understood that the methods for determining the precoding matrix listed above are only examples and should not constitute any limitation to this application. The methods for determining the precoding matrix can refer to the prior art and are not listed here for the sake of brevity.

[0183] The precoding matrix determined by the terminal device can be referred to as the precoding matrix to be fed back, or in other words, the precoding matrix to be reported. The terminal device can indicate the precoding matrix to be fed back using the PMI, so that the access network device can recover the precoding matrix based on the PMI. The precoding matrix recovered by the access network device based on the PMI can be the same as or similar to the precoding matrix to be fed back.

[0184] It should be understood that PMI is only a name and should not constitute any limitation to this application. This application does not exclude the possibility of defining signaling with other names in future protocols for the same or similar functions.

[0185] 2) Frequency domain unit: a unit of frequency domain resources, which can represent different frequency domain resource granularities. Frequency domain units may include, but are not limited to, resource blocks (RBs) or subbands.

[0186] 3) Spatial basis, also known as spatial domain vector, beam vector, spatial beam basis vector, spatial basis vector, or spatial beam. Each element in the spatial domain vector represents the weighting coefficient for each antenna port. By linearly superimposing the signals from each antenna port based on the weighting coefficients represented by each element in the spatial domain basis, a region with a strong signal can be formed in a certain spatial direction.

[0187] The term "antenna port" can also be referred to as "port." An antenna port can be understood as a transmit antenna identified by a receiving device, or a spatially distinguishable transmit antenna. An antenna port can be preconfigured for each virtual antenna. Each virtual antenna can be a weighted combination of multiple physical antennas. Each antenna port can correspond to a reference signal and, therefore, can be referred to as a reference signal port, such as a CSI-RS port or a sounding reference signal (SRS) port.

[0188] The reference signal may be a non-precoded reference signal or a precoded reference signal, which is not limited in this application.

[0189] The spatial basis may be a Discrete Fourier Transform (DFT) vector. A DFT vector may refer to a vector in a DFT matrix. Alternatively, the spatial basis may be the conjugate transpose vector of a DFT vector. A DFT conjugate transpose vector may refer to a column vector in the conjugate transpose matrix of the DFT matrix. Alternatively, the spatial basis may be an oversampled DFT vector. An oversampled DFT vector may refer to a vector in an oversampled DFT matrix.

[0190] 4) Spatial basis set: also known as a spatial vector set, beam vector set, spatial beam basis vector set, or spatial basis vector set. It may include spatial vectors of various lengths to correspond to different numbers of antenna ports. In an embodiment of the present application, the spatial basis used to construct a precoding vector (or precoding matrix) may be determined from a spatial basis set. In other words, the spatial basis set includes multiple candidate spatial vectors that can be used to construct a precoding vector.

[0191] 5) Frequency domain basis, also known as frequency domain vector, frequency domain basis vector, delay domain vector or delay domain basis vector. The frequency domain basis can be used to represent a vector of the channel's change pattern in the frequency domain. Each frequency domain basis can represent a change pattern. Since the signal can reach the receiving antenna from the transmitting antenna through multiple paths when it is transmitted through a wireless channel. Multipath delay causes frequency selective fading, which is the change of the frequency domain channel. Therefore, different frequency domain bases can be used to represent the channel's change pattern in the frequency domain caused by delays on different transmission paths. Exemplarily, the frequency domain basis is a DFT vector. The DFT vector can refer to a column vector in the DFT matrix. The frequency domain basis can also be the conjugate transpose vector of the DFT vector. The DFT conjugate transpose vector can refer to a column vector in the conjugate transpose matrix of the DFT matrix.

[0192] The length of the frequency domain basis can be determined by the number of frequency domain units to be reported pre-configured in the reporting bandwidth, or by the length of the reporting bandwidth, or by a protocol predefined value. This application does not limit the length of the frequency domain basis. Among them, the reporting bandwidth can refer to the CSI reporting bandwidth (CSI-ReportingBand) carried in the CSI reporting configuration in the high-layer signaling (for example, the radio resource control (RRC) message).

[0193] 6) Frequency Domain Basis Set: Also known as a frequency domain basis vector set, this set can include multiple frequency domain bases of varying lengths. In this embodiment of the present application, the frequency domain basis used to construct the precoding vector can be determined from the frequency domain basis set. In other words, the frequency domain basis set includes multiple candidate frequency domain bases that can be used to construct the precoding vector.

[0194] 7) Space-Frequency Basis: Also known as the joint space-frequency vector or space-frequency vector, this vector represents the channel's variation in the space-frequency domain. It can be determined using a spatial basis and a frequency basis. The space-frequency basis can be determined by compression of the spatial and frequency domains separately, or by combined compression of the spatial and frequency domains. For details, see the terminology sections 8) and 9 below. The relationship between the space-frequency basis and the following two parameters will be discussed below in conjunction with compression methods: the spatial basis and the frequency basis.

[0195] 8) Spatial and frequency domain compression refers to quantizing channel parameters using spatial and frequency domain correlations, respectively. This reduces the number of weighting coefficients required for downlink CSI reporting by the terminal device, thereby achieving compressed reporting of the precoding matrix. Optionally, compressed reporting of the channel matrix can also be achieved in this way.

[0196] For example, if the transmitting antenna of the access network device is a dual-polarized antenna, that is, the number of rows of the precoding matrix H is 2M (where M is the number of transmitting antenna ports in one polarization direction). If the access network device is a single-polarized antenna, that is, the number of rows of the precoding matrix H is M, here we take the dual-polarized antenna as an example, but in actual application, the polarization type of the antenna is not limited. The single-polarized antenna can be understood by referring to the description of the dual-polarized antenna. The precoding matrix H can satisfy formula (1-1), where the precoding matrix H is the precoding matrix corresponding to the channel of a receiving antenna port of the terminal device or a data stream: H≈S′C1′C2′C3′F′ H Formula (1-1)

[0197] In formula (1-1), Among them, S′ is the spatial basis matrix, which is a matrix composed of B spatial basis vectors, and the dimension of each spatial basis vector is 2M; F′ is the frequency domain basis matrix, which is a matrix composed of F frequency domain basis vectors, and the dimension of each frequency domain basis vector is N; C1′ is the superposition coefficient matrix 1, which is used to represent the coefficient matrix composed of multiple groups of spatial basis vector coefficients, or the coefficient matrix composed of the weighted coefficients corresponding to each of the B spatial basis vectors; S′C1′ represents the new spatial basis matrix composed of the B spatial basis vectors in S′ through linear combination; C3′ is the superposition coefficient matrix 3, which is used to represent the coefficient matrix composed of multiple groups of frequency domain basis vector coefficients, or the coefficient matrix composed of the weighted coefficients corresponding to each of the F frequency domain basis vectors; C3′F′ H Represents a new frequency domain basis matrix composed of F frequency domain basis vectors in F′ through linear combination; C2′ is the superposition coefficient matrix 2, which is used to represent the new frequency domain basis matrix with each spatial basis vector in S′C1′ and C3′F′ H The coefficient matrix composed of the superposition coefficients corresponding to the space-frequency basis of each frequency domain basis vector in S′C1′ and C3′F′ H The coefficient matrix is ​​composed of the superposition coefficients corresponding to each frequency domain basis vector in . B is the number of spatial domain basis vectors determined by the access network device or terminal device; K S' represents the number of weighted coefficients corresponding to each spatial basis vector; D represents the number of weighted coefficients corresponding to each frequency domain basis vector; F is the number of frequency domain basis vectors determined by the access network device or terminal device; N is the number of frequency units, that is, the length of the frequency domain basis vector, In this paper, it represents the set of complex numbers. It can be seen that H is a complex matrix with 2M rows and N columns.

[0198] In the compression mode of the spatial domain and the frequency domain respectively, a space-frequency basis can be represented by a combination of a frequency domain basis in the above-mentioned frequency domain basis matrix and a spatial domain basis in the above-mentioned spatial domain basis matrix, for example, a frequency domain basis in a frequency domain basis matrix formed by a linear combination of F frequency domain basis vectors and a spatial domain basis in a spatial domain basis matrix formed by a linear combination of B spatial domain basis vectors. When reporting downlink CSI, the terminal device reports information indicating H to the access network device. Specifically, the terminal device can report to the access network device information indicating the channel corresponding to a receiving antenna port or the precoding matrix H corresponding to a data stream.

[0199] 9) Joint spatial and frequency domain compression quantizes channel parameters using the channel's variation in the joint spatial and frequency domains. This reduces the number of weighting coefficients required for downlink CSI reporting by the terminal device, thereby achieving compressed reporting of the precoding matrix. Optionally, this method can also be used to achieve compressed reporting of the channel matrix.

[0200] Specifically, a space-frequency basis can be a vector in a vector matrix represented by a linear combination of the Z1 space-frequency basis vectors and the Z1 group of first weighting coefficients. A space-frequency basis vector is uniquely determined by a space-domain basis vector and a frequency-domain basis vector. For example, a space-frequency basis vector can be a vector formed by the Kronecker product of a space-domain basis vector and a frequency-domain basis vector.

[0201] Exemplarily, formula (1-2) represents the Z2 space-frequency basis:

[0202] Among them, the matrix Each column vector of (1≤n≤Z2) is a space-frequency basis; each column vector b of the matrix B m (1≤m≤Z1) is a space-frequency basis vector; the weighting coefficient matrix C 13 The dimension is Z1×Z2, and each row corresponds to a set of weighted coefficients 1. For the nth space-frequency basis, is a space-frequency basis, which is a linear combination of Z1 space-frequency basis vectors.

[0203] Any space-frequency basis is a linear combination of Z1 space-frequency basis vectors based on Z1 groups of weighting coefficients 1. A group of weighting coefficients 1 includes Z2 weighting coefficients 1. For example, the C shown in the above formula (1-2) 13 As shown, each row vector is a group of weighting coefficients 1, and each row vector includes Z2 elements, and each element is a weighting coefficient 1. For example, the mth group of weighting coefficients 1 in the Z1 group of weighting coefficients 1 includes Z2 weighting coefficients 1. The nth weighting coefficient 1 in the Z2 weighting coefficients 1 is used to characterize the weight of the mth space-frequency basis vector corresponding to the nth space-frequency basis. It should be noted that the value of Z1 and the value of Z2 can be configured by the access network device to the terminal device, or reported to the access network device after the terminal device determines it, or determined by the access network device and the terminal device through negotiation, or agreed upon by the protocol, and this application does not make any specific limitations.

[0204] Specifically, the precoding matrix is ​​characterized by a linear approximation combination of Z2 space-frequency bases and Z2 groups of weighting coefficients 2. Exemplarily, the precoding matrix W can be expressed as the following formula (1-3):

[0205] Among them, W is the precoding matrix to be reported, including R column vectors w r (1≤r≤R); Each column vector of (1≤n≤Z2) is a space-frequency basis. The dimension of the weighting coefficient matrix C2″ is Z2×R, which is the space-frequency basis The corresponding weighted coefficients, each column corresponds to a set of weighted coefficients 2, and each column of weighted coefficients 2 is The joint operation obtains the precoding vector of a receiving antenna port or a data stream, that is, a column vector in W represents a receiving antenna port of the terminal device or a precoding vector of a data stream. For the rth receiving antenna port or the rth data stream, there is r is an integer greater than or equal to 1 and less than or equal to R. R is the number of receiving antenna ports or the number of data streams of the terminal device.

[0206] 10) Spatial feature basis, also known as spatial feature basis vector, spatial feature vector, beam feature vector, or spatial beam feature basis vector. The spatial feature basis differs from the spatial basis in that it is a non-DFT vector. The spatial feature basis is a non-DFT vector obtained by the terminal device using historical channel statistics. The weighted coefficient feedback overhead obtained by decomposing the precoding matrix based on this non-DFT vector is smaller than the weighted coefficient feedback overhead based on the spatial basis.

[0207] 11) Frequency domain feature basis, also known as frequency domain feature basis vector, frequency domain feature vector, delay domain feature vector, or delay domain feature basis vector. The frequency domain feature basis differs from the frequency domain basis in that it is a non-DFT vector. The frequency domain feature basis is a non-DFT basis obtained by the terminal device using historical channel statistics, and the weighted coefficient feedback overhead obtained after the precoding matrix under this non-DFT vector is decomposed is smaller than the weighted coefficient under the frequency domain basis.

[0208] 12) Space-frequency feature basis, also known as space-frequency feature basis vector, space-frequency feature vector, etc. The space-frequency feature basis differs from the space-frequency basis in that it is a non-DFT vector. The space-frequency feature basis is a non-DFT vector obtained by the terminal device based on historical channel statistics. The weighting coefficient feedback overhead under this non-DFT vector is smaller than the weighting coefficient under the space-frequency basis.

[0209] 13) Codebook:

[0210] In CSI measurement, PMI feedback is based on a set of codebook parameters agreed upon by the access network equipment and the terminal equipment. The following introduces several codebook structures and corresponding codebook parameter configuration combinations:

[0211] (1) Taking the structure of the R16e Type II codebook and the corresponding codebook parameter configuration combination as an example, the precoding matrix in the R16e Type II codebook is determined by the weighting coefficient, the spatial domain basis, and the frequency domain basis.

[0212] For example, the structure of the R16e Type II codebook can be expressed as the following formula (1-4), where each transmission layer has one W. The transmission layer can also be referred to as a layer, or as a stream or a transmission stream.

[0213] in, is the spatial basis matrix, indicating that CSI-RS Select 2L spatial beams from the set of DFT matrices, or select 2L columns from the set of DFT matrices, P CSI-RS is the number of channel state information-reference signal (CSI-RS) ports, 2L is the number of selected spatial bases, or 2L is the number of selected beams, or 2L is the number of selected beam combinations; is the weight coefficient matrix corresponding to the selected 2L beams; is the frequency domain basis matrix, which represents the M matrix selected from the DFT matrix set. vN3 is the number of frequency domain units, which can be the number of frequency domain resource blocks (RBs) or subbands. v is the number of selected frequency domain units, that is, the number of selected frequency domain bases. Wherein, the subscript υ represents the number of transmission layers, that is, the total number of transmission layers. It can be understood that Each weighting coefficient in corresponds to a spatial basis in W1 and A frequency domain basis in .

[0214] It should be noted that formulas (1-1), (1-3) and (1-4) are all possible forms of precoding matrices.

[0215] The technique used in (1) above decomposes the precoding matrix into a spatial basis, a frequency basis, and weighting coefficients for feedback, and both the spatial basis and the frequency basis are DFT vectors. The following example decomposes the precoding matrix into non-DFT vectors.

[0216] 2. Structure of R17FeTypeII codebook and corresponding codebook parameter configuration combination

[0217] The structure of the R17FeTypeII codebook can be expressed as follows: Formula (1-5), where there is one W for each transmission layer.

[0218] in, For the port selection matrix, each column of W1 has only one value of 1, indicating that the CSI-RS Select K1 ports from the ports, where K1 is the number of selected ports, that is, the number of selected port basis vectors. is the weighted coefficient matrix corresponding to the selected K1 ports, is the frequency domain basis vector matrix, N3 is the number of frequency domain units, the number of frequency domain units can be the number of frequency domain resource blocks or the number of subbands, W f represents the M2 columns selected from the DFT matrix set, where M2 is the number of selected frequency domain elements, or the number of selected frequency domain basis vectors. The existing R17 protocol specifies eight triplet codebook parameter configuration combinations, as shown in Table 1. The triplet includes α, M, and β.

[0219] Table 1: Codebook parameter configuration combinations for triples in R17

[0220] Among them, α is used to determine the value of K1, where K1 = αP CSI-RS β represents the non-zero coefficient ratio, that is, The proportion of non-zero coefficients in .

[0221] The terminal needs to search in both spatial and frequency domains. In order to limit the CSI feedback overhead, it is necessary to determine the corresponding The number of non-zero coefficients in . It is the transport layer l corresponding The number of non-zero coefficients in , K NZ is the total number of non-zero coefficients. Where l = 1,…,υ, l and υ are positive integers.

[0222] (3) Each transmission layer has a precoding matrix W. The precoding matrix can be decomposed into a spatial feature basis, a frequency feature basis, and a weighting coefficient matrix for feedback. Both the spatial feature basis and the frequency feature basis are non-DFT vectors. The precoding matrix W can be expressed as shown in Formula (1-6).

[0223] U1 represents the spatial feature basis matrix, U f Represents the frequency domain feature basis matrix.

[0224] U1 can include K s Spatial feature basis, U f Can include K f frequency domain feature basis. C2 represents K s spatial feature basis and K f The weighting coefficient matrix corresponding to the frequency domain feature matrices (also called the connection weighting coefficient matrix, or other names, which are not limited in this application) is K. s Indicates the number of spatial feature bases included in U1, K f Indicates U f The number of frequency domain feature bases included in the spatial domain feature base and the frequency domain feature base can be a non-DFT vector obtained by the terminal device through historical channel statistical information, and the feedback overhead of the non-zero weighted coefficient under the non-DFT vector is smaller than the feedback overhead of the non-zero weighted coefficient under the DFT vector set.

[0225] For example, U1 and U f It can be obtained by performing singular value decomposition on the statistical covariance matrix of the channel. For example, the terminal device obtains the channel matrix of time unit t=1,2,…,T through periodic CSI-RS measurement Among them, P CSI-RS is the number of channel spatial domain units, and N3 is the number of channel frequency domain units. The terminal device calculates the channel spatial domain statistical covariance matrix And R s Perform singular value decomposition to obtain R s The first K with the largest eigenvalue s eigenvector U1, where K s ≤P CSI-RS The terminal device calculates the channel frequency domain statistical covariance matrix And R f Perform singular value decomposition to obtain R f The first K with the largest eigenvalue f The eigenvector U f ,in K f ≤N3. The terminal device obtains U1 and U f After that, calculate in is the precoding matrix obtained by CSI-RS measurement, and the precoding matrix W to be reported is expressed as

[0226] (4) The precoding matrix can be decomposed into a space-frequency feature basis and a weighting coefficient matrix for feedback, and the space-frequency feature basis is a non-DFT vector. The precoding matrix W can be expressed as shown in formula (1-7). vec =W sf C3 formula (1-7);

[0227] W sf Represents the space-frequency feature basis matrix, C3 represents the space-frequency feature basis matrix W sf The weighted coefficient matrix under . is the vectorized form of the precoding matrix,

[0228] For example, W sf It can be obtained by performing singular value decomposition on the statistical covariance matrix of the channel. Assume that the terminal device obtains the channel matrix of time unit t=1,2,…,T through periodic CSI-RS measurement Among them, P CSI-RS is the number of channel spatial domain units, and N3 is the number of channel frequency domain units. The terminal device calculates the channel spatial domain statistical covariance matrix And R sf Perform singular value decomposition to obtain R sf The first K with the largest eigenvalue sf The eigenvector W sf ,in K sf ≤P CSI-RS N3. The terminal device obtains W sf After that, calculate in The precoding matrix vector form obtained by CSI-RS measurement is used to obtain the precoding matrix vector form W to be reported.vec Expressed as

[0229] In the R16 and R17 codebooks, the PMI matrix is ​​a two-dimensional space-frequency matrix (i.e., a weighting coefficient matrix). The corresponding reported quantity is the position of the non-zero weighting coefficient in the two-dimensional weighting coefficient matrix, as well as the value of each non-zero weighting coefficient (expressed by amplitude and phase). For each layer, the terminal device needs to report a two-dimensional space-frequency matrix (i.e., ), the two dimensions of the two-dimensional space-frequency matrix are the beam domain and the delay domain (the transform domains of the space domain and the frequency domain respectively).

[0230] Let the weight coefficient matrix corresponding to layer l be C l,i,f , l = 1, 2, …, υ is the layer index, i = 0, 1, …, K-1 is the selected beam index (K beams are selected from 2L beams in PMI feedback, and the rest are not fed back), and f = 0, 1, …, M'-1 is the selected delay index (M' delays are selected from N3 delays). Each weighting coefficient corresponds to a reporting priority Pri(l, i, f). The smaller the Pri(l, i, f), the higher the reporting priority.

[0231] Taking the R17 FeTypeII codebook as an example, Pri(l,i,f)=K·υ·f+υ·i+l.

[0232] Taking the R16 codebook as an example, Pri(l,i,f)=K·υ·π(f)+υ·i+l, where, N3 is the total delay, is the sequence number of the fth delay selected in the lth layer (for example, N3=6, M=3, suppose the lth layer selects 3 delays from the delays numbered 0, 1, 2, 3, 4, and 5, then ). The difference between the R16 codebook and the R17 codebook is that when reporting coefficients of different delays, the R16 codebook gives priority to reporting the coefficients at the 0 delay position, and then reports the coefficients on both sides of the 0 delay in turn. The reason is that the R16 codebook only needs to maintain the spatial domain relationship when feeding back subband-level precoding, that is, different phase rotations can be performed on different frequency domains, and the position of the strongest coefficient can be moved to the 0 delay position without affecting the precoding performance. At this time, the strongest coefficient is at the 0 delay position, and the second strongest coefficient is around the 0 delay position. Therefore, the coefficient at the 0 delay position is reported first, and then the coefficients on both sides of the 0 delay position are reported.

[0233] Currently, in CSI feedback technology, there is only a feedback method for a non-zero weight coefficient matrix with a DFT vector as a basis, but there is no effective method for feedback of a non-zero weight coefficient matrix with a non-DFT vector as a basis.

[0234] Based on this, in order to provide additional feedback on the spatial / frequency domain feature basis or the space-frequency feature basis, an effective feedback method is to further decompose the spatial feature basis, the frequency domain feature basis, or the space-frequency feature basis, decomposing the spatial feature basis onto the spatial basis, decomposing the frequency domain feature basis onto the frequency domain basis, and decomposing the space-frequency feature basis onto the space-frequency basis. See formulas (1-8), (1-9), and (1-10). U1 = C s W1 Formula (1-8) U f =C f W f Formula (1-9) W sf =C sf B sf Formula(1-10)

[0235] Among them, C s Represents the weighted coefficient matrix that decomposes the spatial feature basis into the spatial basis. f Represents the weighted coefficient matrix that decomposes the frequency domain feature basis into the frequency domain basis. sf Represents the weighted coefficient matrix that decomposes the space-frequency feature basis into the space-frequency basis, B sf represents the space-frequency basis matrix.

[0236] Since the spatial and frequency domain dimensions of the channel change relatively slowly, the spatial feature basis, frequency feature basis, or space-frequency feature basis selected by the terminal device changes relatively slowly. Therefore, the weighted coefficient matrix C decomposed by the embodiment of the present application for the spatial feature basis, frequency feature basis, or space-frequency feature basis is s 、C f or C sf The terminal device can use a long-period (e.g., 200ms) feedback method to send the weighting coefficient matrix decomposed for the space-frequency feature basis, frequency domain feature basis, or space-frequency feature basis to the access network device. For C2 or C3, the weighting coefficient matrix can be sent to the access network device using a short-period feedback method.

[0237] The following is a detailed description of the basis feedback method and apparatus provided in the embodiment of the present application. In the embodiment of the present application, the weighted coefficient matrix C is decomposed from the feedback for the spatial feature basis, the frequency feature basis or the space-frequency feature basis. s 、C f or C sf From the perspective of.

[0238] Please refer to Figure 3, which is a flow chart of a base feedback method provided in an embodiment of the present application. Figure 3 is described from the perspective of feedback of spatial domain feature base and frequency domain feature base. As shown in Figure 3, the base feedback method includes the following steps 301-302. The execution subject of the method shown in Figure 3 can be a terminal device and an access network device. Alternatively, the execution subject of the method shown in Figure 3 can be a chip in a terminal device and a chip in an access network device. Figure 3 takes the terminal device and the access network device as the execution subject of the method as an example for explanation. Among them:

[0239] 301, the access network device sends a reference signal to the terminal device, so that the terminal device receives the reference signal from the access network device. The downlink reference signal is used for the spatial domain feature basis and frequency domain feature basis used by the terminal device for feedback. The spatial domain feature basis and frequency domain feature basis use non-DFT vectors. For example,

[0240] The reference signal may be a CSI-RS or a demodulation reference signal (DMRS). It should be understood that the reference signal may also be other signals that can be used by a terminal device to measure a channel, and this application does not limit this.

[0241] 302, the terminal device sends first indication information to the access network device. The first indication information is used to indicate the weighting coefficient matrix of the spatial feature basis and the weighting coefficient matrix of the frequency domain feature basis. For the sake of distinction, the weighting coefficient matrix of the spatial feature basis is called the first weighting coefficient matrix, such as C s The weighting coefficient matrix of the frequency domain feature basis is called the second weighting coefficient matrix, such as C f The weighting coefficients in the first weighting coefficient matrix are referred to as first weighting coefficients, and the weighting coefficients in the second weighting coefficient matrix are referred to as second weighting coefficients.

[0242] Exemplarily, the first indication information may be carried in a radio resource control (RRC), a media access control-control element (MAC-CE) or CSI and reported to the access network device.

[0243] As an example, the number of spatial feature bases is K s , the number of frequency domain feature bases is K f As an example. It should be understood that the above K s and K f The value of K can be configured by the access network device through RRC, MAC-CE, downlink control information (DCI) and other signaling. Or, Ks and K f The value of may also be determined by the protocol. Alternatively, it may be determined by the terminal device itself, which is not specifically limited in this embodiment of the present application.

[0244] The first weighting coefficient matrix can be understood as K s The weighted sum of the first weighted coefficient matrix and the 2L′ spatial basis in the spatial basis set is used to determine K s The second weighting coefficient matrix is ​​K f Each spatial feature basis in the frequency domain feature basis is decomposed into M υ The second weighted coefficient matrix is ​​obtained from the M frequency domain basis set. υ The weighted sum of the ' frequency domain bases is used to determine K f The frequency domain feature basis can be found in (1-9).

[0245] The spatial basis set includes multiple spatial basis, and the above 2L′ spatial basis may include all the spatial basis of the spatial basis set, or may be part of the spatial basis of the spatial basis set. The frequency basis set includes multiple frequency basis, and the above M υ The ' frequency domain basis' may include all frequency domain basis of the frequency domain basis set, or may be part of the frequency domain basis of the frequency domain basis set.

[0246] In this application, the spatial domain basis and frequency domain basis differ from the spatial domain feature basis and frequency domain feature basis in that the spatial domain basis can be a DFT vector, a conjugate transpose vector of a DFT vector, or an oversampled DFT vector. The frequency domain basis can be a DFT vector, a conjugate transpose vector of a DFT vector, or an oversampled DFT vector. For example, both the spatial domain basis and the frequency domain basis can be DFT vectors; or both the spatial domain basis and the frequency domain basis can be oversampled DFT vectors; or the spatial domain basis can be a DFT vector and the frequency domain basis can be an oversampled DFT vector; or, the spatial domain basis can be an oversampled DFT vector and the frequency domain basis can be a DFT vector.

[0247] In this application, the frequency domain basis set and the spatial domain basis set can be configured by the access network device. For example, the access network device can configure the frequency domain basis set and the spatial domain basis set through RRC, MAC-CE, DCI and other signaling. Alternatively, the frequency domain basis set and the spatial domain basis set can also be agreed upon by the protocol. The signaling for configuring the frequency domain basis set and the spatial domain basis set is the same as that for configuring K. s and K fThe value signaling of can be the same signaling or different signaling. Of course, in some embodiments, the frequency domain basis set and the spatial domain basis set can also be configured through different signaling. Similarly, K s and K f The value can also be configured through different signaling.

[0248] In combination with the above example, it can be understood that the first weighting coefficient matrix includes 2L′K s The first weighting coefficient, 2L′K s Each of the first weighting coefficients is associated with K s One of the spatial feature bases and one of the 2L′ spatial bases, the first weighting coefficient can be expressed as C s (i,k 1 ), i represents the sequence number of the selected spatial basis, k 1 Indicates the sequence number of the spatial feature basis, i = 0, 1, ..., 2L-1; k 1 =0,1,…,K s -1.2L′*K s The weighted sum of the first weighted coefficients and the 2L′ spatial bases can determine K s The weighted coefficient used in the weighted sum of 2L′ spatial feature bases is the first weighted coefficient. The second weighted coefficient matrix includes M υ ′*K f The second weighting coefficient, M υ ′*K f Each of the second weighting coefficients is associated with K f One of the frequency domain feature bases and M υ One of the frequency domain bases M υ ′*K f The second weighting coefficient and M υ The weighted sum of the ' frequency domain bases can determine K f Frequency domain feature basis. M υ The weighted coefficient used in the weighted sum of the frequency domain bases is the second weighting coefficient. The first weighting coefficient can be expressed as C f (f,k 2 ), f represents the sequence number of the selected frequency domain basis, k 2 Indicates the serial number of the frequency domain feature basis, f=0,1,…,M υ -1,k 2 =0,1,…,K f -1.

[0249] In the embodiment of the present application, when the terminal device reports the first weighting coefficient matrix and the second weighting coefficient matrix to the access network device, in order to reduce the reporting overhead used, only the non-zero first weighting coefficients in the first weighting coefficient matrix and the non-zero second weighting coefficients in the second weighting coefficient matrix may be reported. The reporting order corresponding to the non-zero first weighting coefficients in the first weighting coefficient matrix and the non-zero second weighting coefficients in the second weighting coefficient matrix can be determined according to the reporting priority. The reporting priority can be positively correlated with the reporting order, that is, the higher the reporting priority, the earlier the non-zero first weighting coefficient / non-zero second weighting coefficient is reported.

[0250] The reporting priority of multiple non-zero first weighting coefficients in the first weighting coefficient matrix is ​​related to the sequence number of the spatial basis associated with the non-zero first weighting coefficient and the sequence number of the spatial feature basis associated with the first non-zero weighting coefficient. It can be understood that each non-zero first weighting coefficient is associated with a reporting priority, and the reporting priority of the non-zero first weighting coefficient can be expressed as Pri s (i,k 1 ), i represents the sequence number of the selected spatial basis, i = 0, 1, ..., 2L-1; k 1 =0,1,…,K s -1.

[0251] The reporting priority of multiple non-zero second weighting coefficients in the second weighting coefficient matrix is ​​related to the sequence number of the frequency domain basis associated with the non-zero second weighting coefficient and the sequence number of the frequency domain feature basis associated with the non-zero second weighting coefficient. It can be understood that each non-zero second weighting coefficient is associated with a reporting priority, and the reporting priority of the non-zero second weighting coefficient can be expressed as Pri f (f,k 2 ), f represents the sequence number of the selected frequency domain basis, k 2 Indicates the serial number of the frequency domain feature basis, f=0,1,…,M υ -1,k 2 =0,1,…,K f -1.

[0252] As an example, the reporting priority of the multiple non-zero first weighting coefficients included in the first weighting coefficient matrix may satisfy the following formula (2-1) or formula (2-2). s (i,k 1 )=2L′k 1 +i Formula (2-1); Pri s (i,k 1 )=K s i+k 1Formula (2-2);

[0253] Where i represents the sequence number of the selected spatial basis, k 1 represents the sequence number of the spatial feature basis, i = 0, 1, ..., 2L'-1; k 1 =0,1,…,K s -1;Pri s (i,k 1 ) represents the priority of the non-zero first weighted coefficient of the spatial basis of the associated sequence number i and the spatial feature basis of the sequence number k. s (i,k 1 ) is smaller, the higher the priority is, that is, the earlier the corresponding non-zero first weighted coefficient is reported.

[0254] As another example, the reporting priority of the multiple non-zero second weighting coefficients included in the second weighting coefficient matrix satisfies any one of formulas (2-3) to (2-6). f (f,k 2 )=M υ k 2 +π′(f) Formula (2-3); Pri f (f,k 2 )=K f π′(f)+k 2 Formula (2-4); Pri f (f,k 2 )=M υ k 2 +f Formula (2-5); Pri f (f,k 2 )=K f f+k 2 Formula (2-6);

[0255] in, f represents the sequence number of the selected frequency domain basis, k 2 Indicates the sequence number of the spatial feature basis, f = 0, 1, ..., M υ ′-1, k 2 =0,1,…,K f -1;Pri f (f,k 2 ) represents the frequency domain basis of the associated sequence number f and the sequence number k2 N3 represents the total number of frequency domain bases (which can be understood as the number of frequency domain bases included in the frequency domain base set), The sequence number of the frequency domain basis of sequence number f in the N3 frequency domain basis. For example, N3=6, M υ '=3, select 3 frequency domain bases from the frequency domain bases numbered 0, 1, 2, 3, 4, 5 as 0, 1, 5, then

[0256] In an embodiment of the present application, the order of reporting the non-zero first weighting coefficient of the spatial domain feature basis and the non-zero second weighting coefficient of the frequency domain feature basis can be that the non-zero first weighting coefficient of the spatial domain feature basis is earlier than the non-zero second weighting coefficient of the frequency domain feature basis, or that the non-zero first weighting coefficient of the spatial domain feature basis is later than the non-zero second weighting coefficient of the frequency domain feature basis.

[0257] In a possible implementation manner, in the embodiment of the present application, the non-zero first weighting coefficients of the spatial domain feature basis and the non-zero second weighting coefficients of the frequency domain feature basis may be grouped separately and reported in a group interleaving manner.

[0258] As an example, the terminal device may divide the non-zero first weighting coefficient of the spatial feature basis and the non-zero second weighting coefficient of the frequency domain feature basis into N information bit groups. Thus, the first indication information includes at least J information bit groups out of the N information bit groups, where N is a positive integer and J is a positive integer less than or equal to N.

[0259] Example 1: Grouping can be performed according to the sequence number of the spatial / frequency domain feature basis.

[0260] The nth information bit group in the N information bit groups includes K sn The information bits and K of the non-zero first weighted coefficients corresponding to the spatial feature basis fn The information bits of the non-zero second weighting coefficients corresponding to the spatial feature basis;

[0261] The number of spatial domain feature bases included in each information bit group may be the same or different, and the number of frequency domain feature bases included may be the same or different.

[0262] For example, the information bits of the non-zero first weighting coefficient and the information bits of the non-zero second weighting coefficient can be evenly distributed to N information bit groups according to the number of spatial / frequency domain feature bases. When n=1, 2, ... N-1, When n=N, Or, when n=1,2,…N-1, When n=N,

[0263] Indicates rounding up. Indicates rounding down.

[0264] Example 2: Grouping can be performed according to the sequence number of the spatial / frequency domain basis.

[0265] The nth information bit group in the N information bit groups includes l n The information bits and m of the non-zero first weighting coefficients corresponding to the spatial basis n The information bits of the non-zero second weighting coefficients corresponding to the spatial feature basis;

[0266] For example, the information bits of the non-zero first weighting coefficient and the information bits of the non-zero second weighting coefficient can be evenly distributed to N information bit groups according to the number of spatial / frequency domain bases. When n=1, 2, ... N-1, When n=N, Or, when n=1,2,…N-1, When n=N,

[0267] Example 3: Grouping can be done based on reporting priority.

[0268] The nth information bit group in the N information bit groups includes N sn The information bits of the non-zero first weighting coefficients and N fn information bits of a non-zero second weighting coefficient; or N s represents the total number of non-zero weight coefficients included in the first weight coefficient matrix, N f represents the total number of non-zero weighting coefficients included in the second weighting coefficient matrix.

[0269] It can be understood that the sum of the number of non-zero first weighting coefficients of the N information bit groups is the sum of the first weighting coefficient matrix divided by K s The number of non-zero first weighting coefficients other than the maximum non-zero first weighting coefficient corresponding to each of the spatial feature basis. It can be understood that the sum of the number of non-zero second weighting coefficients of the N information bit groups is the sum of the number of the second weighting coefficient matrix divided by K f The number of non-zero second weighting coefficients other than the maximum non-zero second weighting coefficient corresponding to each of the frequency domain feature bases.

[0270] For example, the information bits of the non-zero first weighting coefficient and the information bits of the non-zero second weighting coefficient can be evenly distributed to N information bit groups according to the number of non-zero weighting coefficients of the spatial / frequency domain basis. When n=1, 2, ... N-1, When n=N, Or, when n=1,2,…N-1, When n=N,

[0271] In some embodiments, the information bits with non-zero first weighting coefficients in each information bit group as one group and the information bits with non-zero second weighting coefficients as another group can be arranged in two groups in the information bit group. For example, each of the N information bit groups includes a spatial domain information bit group and a frequency domain information bit group. The reporting priority of the spatial domain information bit group in each information bit group is higher than the reporting priority of the frequency domain information bit group in each information bit group; the reporting priority of a spatial domain information bit group in the nth information bit group, i.e., the nth spatial domain information bit group, is higher than the reporting priority of a frequency domain information bit group in the nth information bit group, i.e., the nth frequency domain information bit group, see Figure 4. Alternatively, the reporting priority of the frequency domain information bit group in each information bit group is higher than the reporting priority of the spatial domain information bit group in each information bit group, see Figure 5.

[0272] Exemplarily, in combination with Example 1, the nth spatial information bit group includes K sn The information bits of the non-zero first weighted coefficients corresponding to the spatial feature basis, the nth frequency domain information bit group includes K fn The information bits of the non-zero second weighting coefficients corresponding to the frequency domain feature basis.

[0273] For example, in combination with Example 2, the nth spatial domain information bit group includes l n The information bits of the non-zero first weighting coefficient corresponding to the spatial basis, the nth frequency domain information bit group includes m n The information bits of the non-zero second weighting coefficients corresponding to the spatial feature basis.

[0274] For example, in combination with Example 3, the nth spatial information bit group includes N sn The nth frequency domain information bit group includes N fn The information bits of the non-zero second weighting coefficients.

[0275] In one possible implementation, when the amount of reported resources of the terminal device is insufficient, an information bit group or several information bit group coefficients with a lower order can be discarded, or information bits in the information bit group with a lower order can be discarded according to the order of the groups until the overhead limit is met.

[0276] For example, when the amount of resources reported by the terminal device is greater than or equal to the amount of resources of N information bit groups, N information bit groups are sent to the access network device, that is, no discarding operation is performed. For another example, when the amount of resources reported by the terminal device is less than the amount of resources of N information bit groups, the 1st to the Jth information bit groups in the N information bit groups are sent to the access network device according to the reported amount of resources. That is, the NJ information bit groups with the lower order are discarded. For another example, when the amount of resources reported by the terminal device is less than the amount of resources of N information bit groups, the 1st to the Jth information bit groups and part of the information bits of the J+1th information bit group are sent to the access network device according to the reported amount of resources. That is, the information bits in the lower order information bit groups are discarded in order according to the order of the information bit groups until the reported amount of resources is met. As an example, the information bits in the spatial domain information bit group and the information bits in the frequency domain information bit group in the information bit group can be discarded at intervals. For example, after discarding the information bits of the first weighting coefficient in a spatial domain information bit group, if the overhead limit is still not met, the next information bit is the information bit of the second weighting coefficient in the frequency domain information bit group discarded, and so on, until the overhead limit is met.

[0277] In a possible implementation manner, it can be seen from the above description that when K s When the spatial feature basis is decomposed into 2L spatial basis, there are 2L′K s The first weighting coefficient is 2L′K s Among the first weighting coefficients, some coefficients may have very small amplitudes close to 0 or equal to 0. These coefficients are considered to be zero-valued first weighting coefficients and do not need to be fed back. In this case, only some non-zero first weighting coefficients (set to K0) can be fed back, which can be done through a length of 2L′K s The bitmap (ie, 01 bit sequence) indicates that the K0 non-zero first weighted coefficients of the feedback correspond to 2L′K s Which coefficients of the first weighting coefficients (i.e., indicating the position of the non-zero first weighting coefficient in the first weighting coefficient matrix) are fed back, where the bit corresponding to the first weighting coefficient is 1 and the rest are 0. Similarly, when K f The frequency domain feature bases are decomposed into M υ ' frequency domain basis, there are M υ 'K f The second weighting coefficient. υ 'K fAmong the first weighted coefficients, some coefficients may have very small amplitudes close to 0 or equal to 0. These coefficients are considered as zero-valued second weighted coefficients and do not need to be fed back. In this case, only some non-zero second weighted coefficients (set to K1) can be fed back, which can be done by υ 'K f The bitmap (ie, 01 bit sequence) indicates that the K1 non-zero second weighted coefficients of the feedback correspond to M υ 'K f Which coefficients of the second weighting coefficients are fed back (i.e., indicating the positions of the non-zero second weighting coefficients in the second weighting coefficient matrix), wherein the bit corresponding to the second weighting coefficient being fed back is 1, and the rest are 0. Specifically, the terminal device may send second indication information to the access network device, where the second indication information includes a first bitmap and a second bitmap; the first bitmap is used to indicate the positions of the multiple non-zero first weighting coefficients in the first weighting coefficient matrix, and the second bitmap is used to indicate the positions of the multiple non-zero second weighting coefficients in the second weighting coefficient matrix.

[0278] In a possible implementation, in order to further reduce the reporting overhead, the weighting coefficients may be normalized to obtain information bits of the weighting coefficients before reporting. For example, the multiple weighting coefficients corresponding to each spatial / frequency domain characteristic basis are normalized with the maximum weighting coefficient corresponding to the spatial / frequency domain characteristic basis to obtain information bits of the weighting coefficients and reported. Then the normalized value of the maximum weighting coefficient corresponding to a certain spatial / frequency domain characteristic basis is 1. Furthermore, when reporting, the maximum weighting coefficient for a certain spatial / frequency domain characteristic basis may no longer be reported, and only the position of the maximum weighting coefficient is reported in the bitmap.

[0279] For example, taking the first spatial feature basis as an example, the first spatial feature basis is K s Any spatial feature basis in the spatial feature basis. The information bit of the non-zero first weighting coefficient corresponding to the first spatial feature basis in the first weighting coefficient matrix is ​​obtained by normalizing the multiple non-zero first weighting coefficients corresponding to the first spatial feature basis based on the maximum non-zero first weighting coefficient corresponding to the first spatial feature basis. Taking the first frequency domain feature basis as an example, the first frequency domain feature basis is K f Any frequency domain feature basis in the frequency domain feature basis. The information bit of the non-zero second weighting coefficient corresponding to the first frequency domain feature basis in the second weighting coefficient matrix is ​​obtained by normalizing the multiple non-zero second weighting coefficients corresponding to the first frequency domain feature basis based on the maximum non-zero second weighting coefficient corresponding to the first frequency domain feature basis. When feeding back the first indication information, the first indication information includes the first weighting coefficient matrix except K sThe information bits of multiple non-zero first weighting coefficients other than the maximum non-zero first weighting coefficient corresponding to the spatial feature basis, and the information bits of the second weighting coefficient matrix except K f The information bits of multiple non-zero second weighting coefficients other than the maximum non-zero second weighting coefficient corresponding to the frequency domain feature basis. s The maximum non-zero first weighted coefficient corresponding to each of the spatial feature bases is no longer fed back. f The maximum non-zero second weighting coefficients corresponding to the frequency domain feature bases are no longer fed back, which can further reduce the feedback overhead.

[0280] In a possible implementation, the terminal device may indicate 2L′ spatial bases and M to the access network device. υ ' frequency domain basis, or report 2L' spatial basis and M υ ' frequency domain basis indication information, such as a sequence number or other indication. For example, if the spatial basis set includes X spatial basis, then 2L' spatial basis is selected from the X spatial basis. There are multiple combinations, and the terminal device can choose a combination to report, such as indicating the 2L' spatial basis by reporting the sequence number of the spatial basis combination. For example, if the frequency domain basis set includes Y frequency domain basis, then M frequency domain basis is selected from the Y frequency domain basis. υ There are multiple combinations of frequency domain bases. The terminal device can choose a combination to report, for example, by reporting the sequence number of the frequency domain base combination to indicate M υ ' frequency domain basis. Of course, if 2L' spatial basis and M υ ' frequency domain basis is agreed upon by the protocol, then no reporting is required. Alternatively, 2L' spatial basis is all the spatial basis in the spatial basis set, and M υ ' frequency domain basis is all the frequency domain basis in the frequency domain basis set, then the terminal device may no longer need to perform 2L' spatial domain basis and M υ The sequence number of each frequency domain basis is reported.

[0281] In one possible application scenario, the solution provided in the embodiment corresponding to FIG. 3 of the present application can be applied to a scenario where an access network device needs to obtain a space-frequency feature base and a frequency domain feature base. The access network device can perform some processing or configuration operations based on the obtained space-frequency feature base and frequency domain feature base, and this embodiment of the present application is not limited to this.

[0282] In another possible application scenario, the solution provided in the embodiment corresponding to FIG. 3 of the present application can be applied to a scenario where an access network device needs to provide channel state information feedback.

[0283] In this scenario, the terminal device can feedback the first weighting coefficient matrix of the spatial feature basis and the second weighting coefficient matrix of the frequency domain feature basis to the access network device in a long-period manner. For example, the long period can be the first reporting period. The terminal device can feedback the third weighting coefficient matrix (also known as the joint weighting coefficient matrix of the spatial feature basis and the frequency domain feature basis, such as C2 in formula (1-6)) to the access network device in a short-period manner. The third weighting coefficient matrix is ​​the same as the K s The spatial feature basis and the K f The weighted sum of the frequency domain feature bases is used to determine the precoding matrix; or the third weighting coefficient matrix and the K s The spatial feature basis and the K f The weighted sum of the frequency domain feature bases is used to determine the channel matrix H. For example, the short period can be the second reporting period, and the duration of the first reporting period is longer than the duration of the second reporting period. The third weighting coefficient matrix can be understood as a third weighting coefficient matrix corresponding to each transmission layer.

[0284] In some embodiments, the terminal device may report each third weighting coefficient according to the priority of each third weighting coefficient in the third weighting coefficient matrix corresponding to each transmission layer. For example, the third weighting coefficient matrix corresponding to each transmission layer includes third weighting coefficients corresponding to one transmission layer, one spatial domain feature basis, and one frequency domain feature basis. Each non-zero third weighting coefficient C2(l,k s ,k f ) Associated reporting priority Pri(l,k s ,k f ). The priority of the non-zero third weighting coefficient is related to the transmission layer sequence number associated with the non-zero third weighting coefficient, the sequence number of the spatial domain feature basis, and the sequence number of the frequency domain feature basis.

[0285] Exemplarily, the reporting priority of the multiple non-zero third weighting coefficients included in the third weighting coefficient matrix satisfies formula (2-7). 1 ,k 2 )=vK s k 2 +υk 1 +l formula (2-7);

[0286] Where l = 1, 2, …, υ, k 2 =0,1,…,K f -1,k 1 =0,1,…,K s -1.

[0287] In a possible implementation manner, it can be seen from the above description that when the precoding matrix of the υ transmission layers is decomposed into K s spatial feature basis and K f frequency domain feature bases, with a total of υk 1 k 2 The third weighting coefficient is υk 1 k 2 Among the third weighting coefficients, some coefficients may have very small amplitudes close to 0 or equal to 0. These coefficients are considered as zero-valued third weighting coefficients and do not need to be fed back. In this case, only some non-zero third weighting coefficients (set to K3) can be fed back, which can be done by 1 k 2 The bitmap (ie, 01 bit sequence) indicates that the K3 non-zero third weighted coefficients of the feedback correspond to υk 1 k 2 Which coefficients of the third weighting coefficients are fed back (i.e., indicating the position of the non-zero third weighting coefficient in the third weighting coefficient matrix of which transmission layer), where the bit corresponding to the third weighting coefficient being fed back is 1, and the rest are 0.

[0288] Please refer to Figure 6, which is a flow chart of another base feedback method provided in an embodiment of the present application. Figure 6 is described from the perspective of feedback of the space-frequency characteristic base. As shown in Figure 6, the base feedback method includes steps 601-602. The execution subject of the method shown in Figure 6 can be a terminal device and an access network device. Alternatively, the execution subject of the method shown in Figure 6 can be a chip in a terminal device and a chip in an access network device. Figure 6 takes the terminal device and the access network device as the execution subject of the method as an example for explanation. Among them:

[0289] 601, the access network device sends a reference signal to the terminal device, so that the terminal device receives the reference signal from the access network device. The reference signal is used for the space-frequency feature basis used by the terminal device for feedback. The space-frequency feature basis uses a non-DFT vector. For example,

[0290] The reference signal may be CSI-RS or DMRS. It should be understood that the reference signal may also be other signals that can be used by the terminal device to measure the channel, and this application does not limit this.

[0291] 602, the terminal device sends fourth indication information to the access network device. The fourth indication information is used to indicate the weighting coefficient matrix of the space-frequency characteristic basis. For the sake of distinction, the weighting coefficient matrix of the space-frequency characteristic basis is called the fourth weighting coefficient matrix, such as C sf The weighting coefficients in the fourth weighting coefficient matrix are referred to as fourth weighting coefficients.

[0292] Exemplarily, the fourth indication information may also be carried in CSI and reported to the access network device.

[0293] As an example, the number of space-frequency feature bases is K sf As an example. It should be understood that the above K sf The value of K can be configured by the access network device through RRC, MAC-CE, DCI and other signaling. Or, K sf The value of may also be determined by the protocol. Alternatively, it may be determined by the terminal device itself, which is not specifically limited in this embodiment of the present application.

[0294] The fourth weighting coefficient matrix can be understood as K sf Each space-frequency feature basis is decomposed into G sf The fourth weighting coefficient matrix is ​​obtained on the space-frequency basis. sf The weighted sum of the space-frequency bases is used to determine K sf The space-frequency characteristic basis can be found in formula (1-10).

[0295] G sf The space-frequency basis is composed of 2L″ space-domain basis and M υ 2L″M generated by a frequency domain basis υ "Part or all of the space-frequency base.

[0296] The space-frequency basis set includes multiple space-frequency basis, the above 2L″M υ The space-frequency basis may include all space-frequency basis of the space-frequency basis set, or may be part of the space-frequency basis of the space-frequency basis set. The space-frequency basis in the space-frequency basis set may be obtained by linear combination of the space domain basis and the frequency domain basis, or may be obtained by Kronecker product of the space domain basis and the frequency domain basis. Therefore, 2L″M υ "" space-frequency basis can be 2L" space-domain basis and M υ It is obtained by linear combination of frequency domain bases or by Kronecker product.

[0297] The difference between the spatial domain basis and the space-frequency feature basis in this application is that the space-frequency basis can be a DFT vector, a conjugate transposed vector of a DFT vector, or an oversampled DFT vector. In this application, the space-frequency basis set can be configured by the access network device. For example, the access network device can configure the space-frequency basis set through signaling such as RRC, MAC-CE, or DCI. Alternatively, the space-frequency basis set can also be agreed upon by the protocol. The signaling for configuring the space-frequency basis set is the same as that for configuring K. sf The value signaling can be the same signaling or different signaling.

[0298] Exemplarily, the fourth weighting coefficient matrix includes 2L″M υ ″K sf The fourth weighting coefficient, 2L″Mυ ″K sf Each of the fourth weighting coefficients is associated with K sf One of the space-frequency characteristic bases and 2L″M υ The fourth weighting coefficient can be expressed as C sf (i,f,k 3 ), i represents the sequence number of the spatial domain basis corresponding to the selected space-frequency basis, f represents the sequence number of the frequency domain basis corresponding to the selected space-frequency basis, k 3 Indicates the serial number of the space-frequency feature basis, i = 0, 1, ..., 2L "-1, f = 0, 1, ..., M υ ″-1,k 3 =0,1,…,K sf -1.

[0299] In an embodiment of the present application, when a terminal device reports the fourth weighting coefficient matrix to an access network device, in order to reduce reporting overhead, only the non-zero fourth weighting coefficients in the fourth weighting coefficient matrix may be reported. The order in which the non-zero fourth weighting coefficients in the fourth weighting coefficient matrix are reported may be determined according to a reporting priority. The reporting priority may be positively correlated with the reporting order, i.e., the higher the reporting priority, the earlier the non-zero fourth weighting coefficient is reported.

[0300] The reporting priority of the multiple non-zero fourth weighting coefficients included in the fourth weighting coefficient matrix is ​​related to the sequence number of the space-frequency basis associated with the non-zero fourth weighting coefficient and the sequence number of the space-frequency characteristic basis associated with the non-zero fourth weighting coefficient. It can be understood that each non-zero fourth weighting coefficient is associated with a reporting priority, and the reporting priority of the non-zero fourth weighting coefficient can be expressed as Pri sf (i,f,k 3 ).

[0301] As an example, the reporting priorities of the multiple non-zero weight coefficients included in the fourth weight coefficient matrix satisfy Formula (3-1) or Formula (3-2). sf (i,f,k 3 )=2L″k 3 π′(f)+2L″k 3 +i Formula (3-1); Pri(i,f,k 3 )=2L″N3k 3 +2L″π′(f)+i Formula (3-2);

[0302] in, i represents the sequence number of the spatial domain basis corresponding to the selected space-frequency basis, f represents the sequence number of the frequency domain basis corresponding to the selected space-frequency basis, k 3 Indicates the serial number of the space-frequency feature basis, i = 0, 1, ..., 2L "-1, f = 0, 1, ..., M υ ″-1,k 3 =0,1,…,K sf -1; Pri(i,f,k 3 ) represents the frequency domain basis of the associated sequence number f, sequence number k 3 The priority of the non-zero weighted coefficients of the spatial-frequency feature basis and the spatial-domain basis of sequence number i, N3 represents the total number of the frequency-domain basis, Represents the sequence number of the frequency domain basis of sequence number f in the N3 frequency domain basis.

[0303] In some embodiments, the reporting of the non-zero fourth weighting coefficient may also be performed in a grouped manner. For example, the non-zero fourth weighting coefficient may be grouped into N information bit groups. The fourth indication information includes at least J information bit groups out of the N information bit groups, where N is a positive integer and J is a positive integer less than or equal to N.

[0304] Example 4: Grouping can be performed according to the sequence number of the space-frequency feature basis.

[0305] The nth information bit group among N information bit groups includes K sfn The information bits of the non-zero first weighting coefficient corresponding to the space-frequency feature basis,

[0306] The number of space-frequency characteristic bases included in each information bit group may be the same or different.

[0307] For example, the information bits of the non-zero fourth weighting coefficient can be evenly distributed to N information bit groups according to the number of space-frequency feature bases. When n=1, 2, ... N-1, When n=N, Or, when n=1,2,…N-1, When n=N,

[0308] Example 5: Grouping can be done based on reporting priority.

[0309] The nth information bit group in the N information bit groups includes N sfn information bits of a non-zero fourth weighting coefficient, N sf represents the total number of non-zero fourth weighting coefficients included in the fourth weighting coefficient matrix.

[0310] For example, the information bits of the non-zero fourth weighting coefficients can be evenly distributed to N information bit groups according to the number of non-zero fourth weighting coefficients. When n=1, 2, ... N-1, When n=N,

[0311] In one possible implementation, when the amount of reported resources of the terminal device is insufficient, an information bit group or several information bit group coefficients with a lower order can be discarded, or information bits in the information bit group with a lower order can be discarded according to the order of the groups until the overhead limit is met.

[0312] For example, when the amount of resources reported by the terminal device is greater than or equal to the amount of resources of the N information bit groups, the N information bit groups are sent to the access network device. For another example, when the amount of resources reported by the terminal device is less than the amount of resources of the N information bit groups, the first information bit group to the Jth information bit group of the N information bit groups are sent to the access network device based on the reported amount of resources. For another example, when the amount of resources reported by the terminal device is less than the amount of resources of the N information bit groups, the first information bit group to the Jth information bit group and part of the information bits of the J+1th information bit group are sent to the access network device based on the reported amount of resources.

[0313] For another example, when the reporting resources are insufficient, the coefficients with the lower priority are discarded according to the reporting priority sorting. Specifically, when the reported resource amount of the terminal device is less than the resource amount of the information bits of the non-zero fourth weighting coefficients in the fourth weighting coefficient matrix, the information bits of some of the non-zero fourth weighting coefficients in the fourth weighting coefficient matrix are sent to the access network device according to the reported resource amount, and the resource amount of the information bits of some of the non-zero fourth weighting coefficients meets the reported resource amount of the terminal device, and the reporting priority of the some of the non-zero fourth weighting coefficients is higher than the reporting priority of the non-zero fourth weighting coefficients in the fourth weighting coefficient matrix other than the some of the non-zero fourth weighting coefficients.

[0314] For another example, when the space-frequency characteristic base is sorted by sequence number and the reported resources are insufficient, the coefficients corresponding to the space-frequency characteristic bases with the lower order are discarded. Specifically, when the reported resource amount of the terminal device is less than the resource amount of the information bits of the non-zero fourth weighting coefficients in the fourth weighting coefficient matrix, the information bits of the non-zero fourth weighting coefficients corresponding to part of the space-frequency characteristic bases in the fourth weighting coefficient matrix are sent to the access network device according to the reported resource amount; the part of the space-frequency characteristic base is the K sfn The space-frequency feature basis with a sequence number less than g in the space-frequency feature basis.

[0315] In a possible implementation manner, it can be seen from the above description that when Ksf The spatial feature basis is decomposed into 2L″M υ ″ space frequency base, there are 2L″M υ ″K sf The fourth weighting coefficient is 2L″M υ ″K sf Among the fourth weighting coefficients, some coefficients may have very small amplitudes close to 0 or equal to 0. These coefficients are considered as zero-valued fourth weighting coefficients and do not need to be fed back. In this case, only some non-zero fourth weighting coefficients (set to K4) can be fed back, which can be done through a length of 2L″M υ ″K sf The bitmap (ie, 01 bit sequence) indicates that the K4 non-zero fourth weighting coefficients of the feedback correspond to 2L″M υ ″K sf Which coefficients of the fourth weighting coefficients are fed back (ie, indicating the positions of the non-zero fourth weighting coefficients in the fourth weighting coefficient matrix), wherein the bit corresponding to the fourth weighting coefficient being fed back is 1, and the rest are 0.

[0316] In a possible implementation, the terminal device may indicate 2L″ spatial bases and M to the access network device. υ "frequency domain basis, or report 2L" spatial basis and M υ "Indication information of frequency domain bases, such as serial numbers or other indications. For example, if the spatial domain base set includes X spatial domain bases, then 2L" spatial domain bases are selected from the X spatial domain bases. There are multiple combinations, and the terminal device can choose a combination to report, for example, by reporting the serial number of the spatial domain base combination to indicate the 2L" spatial domain bases. For example, if the frequency domain base set includes Y frequency domain bases, then M are selected from the Y frequency domain bases. υ There are multiple combinations of frequency domain bases. The terminal device can choose a combination to report, for example, by reporting the sequence number of the frequency domain base combination to indicate M υ ″ frequency domain basis. Of course, if 2L″M υ ″ space-frequency bases are agreed upon by the protocol, and they do not need to be reported. Alternatively, 2L″ space-frequency bases are all the space-frequency bases in the space-frequency base set, and M υ The frequency domain basis is all the frequency domain basis in the frequency domain basis set, and after processing, 2L"M υ "A space frequency base, and then the terminal equipment can no longer perform 2L"M υ "The sequence number of the space frequency base is reported.

[0317] In some embodiments, the terminal device may also indicate 2L″M υ G in a space-frequency basis sf A space frequency base, such as by reporting G sfIn some other embodiments, 2L″M υ When the space-frequency basis is the complete set of space-frequency basis sets, it is also possible to directly obtain the 2L"M υ "A space frequency base selection G sf space-frequency base, and from 2L″M υ "A space frequency base selection G sf The multiple combinations of space-frequency bases are used to determine the selected combination and report the sequence number of the combination.

[0318] In one possible application scenario, the solution provided in the embodiment corresponding to FIG. 6 of the present application can be applied to a scenario where an access network device needs to obtain a space-frequency feature base. The access network device can perform some processing or configuration operations based on the obtained space-frequency feature base, and this embodiment of the present application is not limited to this.

[0319] In another possible application scenario, the solution provided in the embodiment corresponding to FIG. 6 of the present application can be applied to a scenario where an access network device needs to provide channel state information feedback.

[0320] In this scenario, the terminal device can feedback the fourth weighting coefficient matrix of the space-frequency feature basis to the access network device in a long-cycle manner. For example, the long cycle can be the first reporting cycle. The terminal device can feedback the fifth weighting coefficient matrix to the access network device in a short-cycle manner, for example, see C3 in formula (1-7). The fifth weighting coefficient matrix is ​​the same as the K sf The weighted sum of the space-frequency characteristic bases is used to determine the precoding matrix; or the fifth weighting coefficient matrix and the K sf The weighted sum of the space-frequency feature bases is used to determine the channel matrix H. For example, the short period can be the second reporting period, and the duration of the first reporting period is greater than the duration of the second reporting period. The fifth weighting coefficient matrix can be understood as a fifth weighting coefficient matrix corresponding to each transmission layer.

[0321] In some embodiments, the terminal device may report each fifth weighting coefficient according to the priority of each fifth weighting coefficient in the fifth weighting coefficient matrix corresponding to each transmission layer. For example, the fifth weighting coefficient included in the fifth weighting coefficient matrix corresponding to each transmission layer corresponds to one transmission layer and one space-frequency characteristic basis. Each non-zero fifth weighting coefficient C3(l,k 3 ) Associated reporting priority Pri(l,k 3 ). The priority of the non-zero fifth weighting coefficient is related to the transmission layer sequence number associated with the non-zero fifth weighting coefficient and the sequence number of the space-frequency characteristic base.

[0322] Exemplarily, the reporting priority of the multiple non-zero fifth weighting coefficients included in the fifth weighting coefficient matrix satisfies formula (3-3).3 )=υk 3 +l formula (3-3);

[0323] Where l = 1, 2, …, υ, k 3 =0,1,…,K sf -1.

[0324] When reporting the spatial feature basis and the frequency domain feature basis (or the space-frequency feature basis), the present application decomposes the spatial feature basis and the frequency domain feature basis into the spatial basis and the frequency domain basis (or decomposes the space-frequency feature basis into the space-frequency basis), and indicates the spatial feature basis and the frequency domain feature basis (or the space-frequency feature basis) respectively by reporting the weighted coefficients obtained by the decomposition, and associates the sequence number of the spatial basis, the sequence number of the frequency domain basis, and the sequence number of the spatial feature basis and the frequency domain feature basis in the priority of reporting the weighted coefficients. In addition, the present application ensures that the coefficients with larger amplitudes have higher priority as much as possible, that is, they are fed back first, and the coefficients with smaller amplitudes are discarded first, so as to ensure the reporting accuracy and improve the system performance.

[0325] In the embodiments provided above, the methods provided in the embodiments of the present application are described from the perspective of interaction between various devices. In order to implement the various functions in the methods provided in the embodiments of the present application, the access network device or the terminal device may include a hardware structure and / or a software module, and implement the above functions in the form of a hardware structure, a software module, or a hardware structure plus a software module. Whether a function of the above functions is executed in the form of a hardware structure, a software module, or a hardware structure plus a software module depends on the specific application and design constraints of the technical solution.

[0326] The division of modules in the embodiments of the present application is illustrative and is merely a logical functional division. In actual implementation, other division methods may be used. Furthermore, the functional modules in the various embodiments of the present application may be integrated into a single processor, or may exist physically separately, or two or more modules may be integrated into a single module. The aforementioned integrated modules may be implemented in the form of hardware or software functional modules.

[0327] Similar to the above concept, as shown in Figure 7, an embodiment of the present application also provides a communication device for implementing the functions of the access network device or terminal device in the above method. For example, the device can be a software module or a chip system. In the embodiment of the present application, the chip system can be composed of a chip, or it can include a chip and other discrete devices. The communication device 700 may include a transmitting unit 701 and a receiving unit 702. The communication device 700 may also include a processing unit 703. The transmitting unit 701 and the receiving unit 702 can also be integrated into a communication unit.

[0328] In the embodiment of the present application, the communication unit may also be referred to as a transceiver unit, which is used to execute the steps of sending and receiving by the access network device or the terminal device in the above method embodiment.

[0329] The communication device provided in the embodiment of the present application is described in detail below with reference to Figures 7 and 8. It should be understood that the description of the device embodiment corresponds to the description of the method embodiment. Therefore, for matters not described in detail, reference can be made to the method embodiment above. For the sake of brevity, they will not be repeated here.

[0330] A communication unit may also be referred to as an interface circuit, transceiver, or transceiver device. A processing unit may also be referred to as a processor, processing board, processing module, or processing device. Optionally, the device in a communication unit that implements the receiving function may be considered a receiving unit, and the device in a communication unit that implements the transmitting function may be considered a transmitting unit. That is, a communication unit includes a receiving unit 702 and a transmitting unit 701. A communication unit may also be referred to as a transceiver, interface circuit, or transceiver circuit. A receiving unit may also be referred to as a receiver, receiver, or receiving circuit. A transmitting unit may also be referred to as a transmitter, transmitter, or transmitting circuit.

[0331] When the communication device realizes the function of a terminal device, in one possible application scenario:

[0332] The receiving unit 702 receives a reference signal from an access network device, where the reference signal is used to indicate a spatial domain feature basis and a frequency domain feature basis used for feedback by the terminal device.

[0333] The sending unit 701 sends first indication information to the access network device, wherein the first indication information is used to indicate a first weighting coefficient matrix and a second weighting coefficient matrix. The weighted sum of the first weighting coefficient matrix and the 2L′ spatial basis in the spatial basis set is used to determine K s The second weighting coefficient matrix and the M in the frequency domain basis set υ The weighted sum of the ' frequency domain bases is used to determine K f frequency domain characteristic basis; the reporting priority of multiple non-zero first weighting coefficients in the first weighting coefficient matrix is ​​related to the serial number of the spatial domain basis associated with the non-zero first weighting coefficient and the serial number of the spatial domain characteristic basis associated with the first non-zero weighting coefficient; the reporting priority of multiple non-zero second weighting coefficients in the second weighting coefficient matrix is ​​related to the serial number of the frequency domain basis associated with the non-zero second weighting coefficient and the serial number of the frequency domain characteristic basis associated with the non-zero second weighting coefficient.

[0334] In some embodiments, the processing unit 703 is configured to control the communication unit (sending unit 701) to send first indication information to the access network device.

[0335] In one possible implementation, the sending unit 701 sends the N information bit groups to the access network device when the reported resource amount of the terminal device is greater than or equal to the resource amount of the N information bit groups; or, when the reported resource amount of the terminal device is less than the resource amount of the N information bit groups, sends the 1st information bit group to the Jth information bit group of the N information bit groups to the access network device according to the reported resource amount; or, when the reported resource amount of the terminal device is less than the resource amount of the N information bit groups, sends the 1st information bit group to the Jth information bit group and part of the information bits of the J+1th information bit group to the access network device according to the reported resource amount.

[0336] In one possible implementation, the sending unit 701 sends second indication information to the access network device, where the second indication information includes a first bit map and a second bit map; the first bit map is used to indicate the positions of the multiple non-zero first weighting coefficients in the first weighting coefficient matrix, and the second bit map is used to indicate the positions of the multiple non-zero second weighting coefficients in the second weighting coefficient matrix.

[0337] In a possible implementation manner, the sending unit 701 periodically sends the first indication information to the access network device according to the first reporting period; periodically sends third indication information to the access network device according to the second reporting period, wherein the third indication information is used to indicate a third weighting coefficient matrix; the third weighting coefficient matrix is ​​the same as the K s The spatial feature basis and the K f The weighted sum of the frequency domain feature bases is used to determine the precoding matrix; the first reporting period is greater than the second reporting period.

[0338] When the communication device realizes the function of a terminal device, another possible application scenario is:

[0339] The receiving unit 702 receives a reference signal from an access network device, where the reference signal is used to indicate a space-frequency characteristic basis used for feedback by a terminal device.

[0340] The sending unit 701 sends fourth indication information to the access network device, where the fourth indication information is used to indicate a fourth weighting coefficient matrix.

[0341] Among them, the fourth weighted coefficient matrix and G sf The weighted sum of the space-frequency bases is used to determine K sfa space-frequency characteristic basis; the reporting priority of multiple non-zero fourth weighting coefficients included in the fourth weighting coefficient matrix is ​​related to the serial number of the space-frequency basis associated with the non-zero fourth weighting coefficient and the serial number of the space-frequency characteristic basis associated with the non-zero fourth weighting coefficient.

[0342] In one possible implementation, the sending unit 701 sends the N information bit groups to the access network device when the reported resource amount of the terminal device is greater than or equal to the resource amount of the N information bit groups; or, when the reported resource amount of the terminal device is less than the resource amount of the N information bit groups, sends the 1st information bit group to the Jth information bit group of the N information bit groups to the access network device according to the reported resource amount; or, when the reported resource amount of the terminal device is less than the resource amount of the N information bit groups, sends the 1st information bit group to the Jth information bit group and part of the information bits of the J+1th information bit group to the access network device according to the reported resource amount.

[0343] In one possible implementation, the sending unit 701 sends information bits of some non-zero fourth weighting coefficients in the fourth weighting coefficient matrix to the access network device according to the reported resource amount when the reported resource amount of the terminal device is less than the resource amount of the information bits of the non-zero fourth weighting coefficients in the fourth weighting coefficient matrix, the resource amount of the information bits of the some non-zero fourth weighting coefficients meets the reported resource amount of the terminal device, and the reporting priority of the some non-zero fourth weighting coefficients is higher than the reporting priority of the non-zero fourth weighting coefficients in the fourth weighting coefficient matrix except the some non-zero fourth weighting coefficients; or,

[0344] When the reported resource amount of the terminal device is less than the resource amount of the information bit of the non-zero fourth weighting coefficient in the fourth weighting coefficient matrix, the information bit of the non-zero fourth weighting coefficient corresponding to the partial space-frequency characteristic basis in the fourth weighting coefficient matrix is ​​sent to the access network device according to the reported resource amount; the partial space-frequency characteristic basis is the K sfn The space-frequency feature basis with a sequence number less than g in the space-frequency feature basis.

[0345] In a possible implementation manner, the sending unit 701 periodically sends the fourth indication information to the access network device according to the first reporting period; periodically sends the fifth indication information to the access network device according to the second reporting period, wherein the fifth indication information is used to indicate a fifth weighting coefficient matrix; the fifth weighting coefficient matrix is ​​the same as the K sf The weighted sum of the space-frequency characteristic bases is used to determine the precoding matrix; the first reporting period is greater than the second reporting period.

[0346] When the communication device implements the function of an access network device, in one possible application scenario:

[0347] The sending unit 701 sends a reference signal to the terminal device, where the reference signal is used to indicate the spatial domain feature basis and the frequency domain feature basis used for feedback by the terminal device.

[0348] The receiving unit 702 receives first indication information from the terminal device, where the first indication information is used to indicate a first weighting coefficient matrix and a second weighting coefficient matrix.

[0349] The weighted sum of the first weighting coefficient matrix and the 2L′ spatial basis in the spatial basis set is used to determine K s The second weighting coefficient matrix and the M in the frequency domain basis set υ The weighted sum of the ' frequency domain bases is used to determine K f frequency domain characteristic basis; the reporting priority of multiple non-zero first weighting coefficients in the first weighting coefficient matrix is ​​related to the serial number of the spatial domain basis associated with the non-zero first weighting coefficient and the serial number of the spatial domain characteristic basis associated with the first non-zero weighting coefficient; the reporting priority of multiple non-zero second weighting coefficients in the second weighting coefficient matrix is ​​related to the serial number of the frequency domain basis associated with the non-zero second weighting coefficient and the serial number of the frequency domain characteristic basis associated with the non-zero second weighting coefficient.

[0350] In one possible implementation, the receiving unit 702 receives the N information bit groups from the terminal device when the reported resource amount of the terminal device is greater than or equal to the resource amount of the N information bit groups; or, when the reported resource amount of the terminal device is less than the resource amount of the N information bit groups, receives the 1st information bit group to the Jth information bit group of the N information bit groups from the terminal device; or, when the reported resource amount of the terminal device is less than the resource amount of the N information bit groups, receives the 1st information bit group to the Jth information bit group and part of the information bits of the J+1th information bit group from the terminal device.

[0351] In one possible embodiment, the receiving unit 702 receives second indication information from the terminal device, and the second indication information includes a first bit map and a second bit map; the first bit map is used to indicate the positions of the multiple non-zero first weighting coefficients in the first weighting coefficient matrix, and the second bit map is used to indicate the positions of the multiple non-zero second weighting coefficients in the second weighting coefficient matrix.

[0352] In a possible implementation manner, the receiving unit 702 periodically receives the first indication information from the terminal device according to the first reporting period; periodically receives the third indication information from the terminal device according to the second reporting period, wherein the third indication information is used to indicate a third weighting coefficient matrix; the third weighting coefficient matrix is ​​the same as the K s The spatial feature basis and the K f The weighted sum of the frequency domain feature bases is used to determine the precoding matrix; the first reporting period is greater than the second reporting period.

[0353] When the communication device implements the function of an access network device, in another possible application scenario:

[0354] The sending unit 701 sends a reference signal to the terminal device, where the reference signal is used to indicate the space-frequency characteristic basis used for feedback by the terminal device.

[0355] The receiving unit 702 receives fourth indication information from the terminal device, wherein the fourth indication information is used to indicate a fourth weighting coefficient matrix. sf The weighted sum of the space-frequency bases is used to determine K sf a space-frequency characteristic basis; the reporting priority of multiple non-zero fourth weighting coefficients included in the fourth weighting coefficient matrix is ​​related to the serial number of the space-frequency basis associated with the non-zero fourth weighting coefficient and the serial number of the space-frequency characteristic basis associated with the non-zero fourth weighting coefficient.

[0356] In one possible implementation, the receiving unit 702 receives the N information bit groups from the terminal device when the reported resource amount of the terminal device is greater than or equal to the resource amount of the N information bit groups; or, when the reported resource amount of the terminal device is less than the resource amount of the N information bit groups, receives the 1st information bit group to the Jth information bit group of the N information bit groups from the terminal device; or, when the reported resource amount of the terminal device is less than the resource amount of the N information bit groups, receives the 1st information bit group to the Jth information bit group and part of the information bits of the J+1th information bit group from the terminal device.

[0357] In one possible implementation, the receiving unit 702 receives information bits of some non-zero fourth weighting coefficients in the fourth weighting coefficient matrix from the terminal device when the reported resource amount of the terminal device is less than the resource amount of the information bits of the non-zero fourth weighting coefficients in the fourth weighting coefficient matrix, the resource amount of the information bits of the some non-zero fourth weighting coefficients meets the reported resource amount of the terminal device, and the reporting priority of the some non-zero fourth weighting coefficients is higher than the reporting priority of the non-zero fourth weighting coefficients in the fourth weighting coefficient matrix except the some non-zero fourth weighting coefficients; or, when the reported resource amount of the terminal device is less than the resource amount of the information bits of the non-zero fourth weighting coefficients in the fourth weighting coefficient matrix, receives information bits of the non-zero fourth weighting coefficients corresponding to some space-frequency characteristic basis in the fourth weighting coefficient matrix from the terminal device; the some space-frequency characteristic basis is the K sfn The space-frequency feature basis with a sequence number less than g in the space-frequency feature basis.

[0358] In a possible implementation manner, the receiving unit 702 periodically receives the fourth indication information from the terminal device according to the first reporting period; periodically receives the fifth indication information from the terminal device according to the second reporting period, wherein the fifth indication information is used to indicate a fifth weighting coefficient matrix; the fifth weighting coefficient matrix is ​​the same as the K sf The weighted sum of the space-frequency characteristic bases is used to determine the precoding matrix; the first reporting period is greater than the second reporting period.

[0359] The above are just examples. The processing unit 703 and the communication unit (sending unit 701 and / or receiving unit 702) can also perform other functions. For more detailed descriptions, please refer to the relevant descriptions in the embodiments shown in Figures 3 and 6, which are not repeated here.

[0360] FIG8 is a schematic diagram of a communication device according to an embodiment of the present application. The device shown in FIG8 may be a hardware circuit implementation of the device shown in FIG7 . This communication device can be used in the flowcharts shown above to perform the functions of the terminal device or access network device in the above-described method embodiments. For ease of illustration, FIG8 only shows the main components of the communication device.

[0361] As shown in Figure 8, communication device 800 includes a processor 810 and an interface circuit 820. Processor 810 and interface circuit 820 are coupled to each other. It will be understood that interface circuit 820 can be an interface circuit, a pin, an interface circuit, or an input / output interface. Optionally, communication device 800 may also include a memory 830 for storing instructions executed by processor 810, or storing input data required by processor 810 to execute instructions, or storing data generated after processor 810 executes instructions. Interface circuits may also be referred to as transceivers, transceivers, input / output circuits, or transceiver circuits.

[0362] When the communication device 800 is used to implement the method shown in FIG3 , the processor 810 is used to implement the functions of the processing unit 703 , and the interface circuit 820 is used to implement the functions of the communication unit.

[0363] When the communication device is a chip used in a terminal device, the terminal device chip implements the functions of the terminal device in the above method embodiments. The terminal device chip receives information from other modules in the terminal device (such as a radio frequency module or antenna), and the information is sent by the access network device to the terminal device; or the terminal device chip sends information to other modules in the terminal device (such as a radio frequency module or antenna), and the information is sent by the terminal device to the access network device.

[0364] When the aforementioned communication device is a chip used in an access network device, the access network device chip implements the functions of the access network device in the aforementioned method embodiments. The access network device chip receives information from other modules in the access network device (such as a radio frequency module or antenna), where the information is sent by the terminal device to the access network device; or the access network device chip sends information to other modules in the access network device (such as a radio frequency module or antenna), where the information is sent by the access network device to the terminal device.

[0365] It is understood that the processor in the embodiments of the present application may be a central processing unit, or may be other general-purpose processors, digital signal processors, application-specific integrated circuits, or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. The general-purpose processor may be a microprocessor or any conventional processor.

[0366] In the embodiments of the present application, the memory may be a random access memory, a flash memory, a read-only memory, a programmable read-only memory, an erasable programmable read-only memory, an electrically erasable programmable read-only memory, a register, a hard disk, a mobile hard disk, or any other form of storage medium known in the art.

[0367] An embodiment of the present application provides a communication system, which includes the aforementioned terminal device and access network device.

[0368] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working process of the communication system described above can refer to the corresponding process in the aforementioned method embodiment and will not be repeated here.

[0369] One embodiment of the present application provides a computer-readable medium for storing a computer program, wherein the computer program includes instructions for executing the method steps in the method embodiment corresponding to FIG. 3 or FIG. 6 .

[0370] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, optical storage, etc.) that contain computer-usable program code.

[0371] The present application is described with reference to the flow chart and / or block diagram of the method, device (system), and computer program product according to the embodiment of the present application. It should be understood that each flow process and / or box in the flow chart and / or block diagram and the combination of the flow process and / or box in the flow chart and / or block diagram can be realized by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processing machine or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device produce a device for realizing the function specified in one flow chart flow or multiple flows and / or one box or multiple boxes of the block diagram.

[0372] Obviously, those skilled in the art may make various changes and modifications to the present application without departing from the scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include these modifications and variations.

Claims

1. A base feedback method, characterized in that: include: Receiving a reference signal from an access network device, where the reference signal is used to indicate a spatial domain feature basis and a frequency domain feature basis used for feedback by the terminal device; Sending first indication information to the access network device, where the first indication information is used to indicate a first weighting coefficient matrix and a second weighting coefficient matrix; The weighted sum of the first weighting coefficient matrix and the 2L′ spatial basis in the spatial basis set is used to determine K s The second weighting coefficient matrix and the M in the frequency domain basis set υ The weighted sum of the ′ frequency domain bases is used to determine K f frequency domain feature basis; The reporting priority of the plurality of non-zero first weighting coefficients in the first weighting coefficient matrix is ​​related to the sequence number of the spatial basis associated with the non-zero first weighting coefficient and the sequence number of the spatial feature basis associated with the first non-zero weighting coefficient; The reporting priority of the multiple non-zero second weighting coefficients in the second weighting coefficient matrix is ​​related to the sequence number of the frequency domain basis associated with the non-zero second weighting coefficient and the sequence number of the frequency domain characteristic basis associated with the non-zero second weighting coefficient.

2. The method according to claim 1, characterized in that The first indication information includes at least J information bit groups out of N information bit groups, where N is a positive integer and J is a positive integer less than or equal to N; The nth information bit group in the N information bit groups includes K sn The information bits and K of the non-zero first weighted coefficients corresponding to the spatial feature basis fn The information bits of the non-zero second weighting coefficients corresponding to the spatial feature basis; or, The nth information bit group in the N information bit groups includes l n The information bits and m of the non-zero first weighting coefficients corresponding to the spatial basis n The information bits of the non-zero second weighting coefficients corresponding to the spatial feature basis; or, The nth information bit group in the N information bit groups includes N sn The information bits of the non-zero first weighting coefficients and N fn information bits of a non-zero second weighting coefficient; or N s represents the total number of non-zero weighting coefficients included in the first weighting coefficient matrix, N f Represents the total number of non-zero weighting coefficients included in the second weighting coefficient matrix.

3. The method according to claim 2, characterized in that When n=1,2,…N-1, When n = N, or, When n=1,2,…N-1, When n = N, or, When n=1,2,…N-1, When n = N, 4. The method according to claim 2 or 3, characterized in that Each of the N information bit groups includes a spatial domain information bit group and a frequency domain information bit group; the reporting priority of the spatial domain information bit group in each information bit group is higher than the reporting priority of the frequency domain information bit group in each information bit group, or the reporting priority of the frequency domain information bit group in each information bit group is higher than the reporting priority of the spatial domain information bit group in each information bit group; The nth spatial information bit group includes K sn The information bits of the non-zero first weighted coefficients corresponding to the spatial feature basis, the nth frequency domain information bit group includes K fn information bits of non-zero second weighting coefficients corresponding to frequency domain feature bases; or, The nth spatial information bit group includes l n The nth frequency domain information bit group includes m n The information bits of the non-zero second weighting coefficients corresponding to the spatial feature basis; or The nth spatial information bit group includes N sn The nth frequency domain information bit group includes N fn The information bits of the non-zero second weighting coefficients.

5. The method according to any one of claims 2 to 4, characterized in that: Sending first indication information to the access network device includes: When the reported resource amount of the terminal device is greater than or equal to the resource amount of the N information bit groups, sending the N information bit groups to the access network device; or, When the reported resource amount of the terminal device is less than the resource amount of the N information bit groups, sending the first information bit group to the Jth information bit group of the N information bit groups to the access network device according to the reported resource amount; or, When the reported resource amount of the terminal device is less than the resource amount of the N information bit groups, the 1st information bit group to the Jth information bit group and part of the information bits of the J+1th information bit group are sent to the access network device according to the reported resource amount.

6. The method according to any one of claims 1 to 5, characterized in that: The reporting priority of the multiple non-zero first weighting coefficients included in the first weighting coefficient matrix satisfies: Pri s (i,k 1 )=2L′k 1 +i; or, Pri s (i,k 1 )=K s i+k 1 ; Where i represents the sequence number of the selected spatial basis, k 1 represents the serial number of the spatial feature basis, i=0,1,…,2L′-1; k 1 =0,1,…,K s -1;Pri s (i,k 1 ) represents the priority of the non-zero first weighted coefficient of the spatial basis of the association number i and the spatial feature basis of the association number k.

7. The method according to any one of claims 1 to 6, characterized in that: The reporting priority of the plurality of non-zero second weighting coefficients included in the second weighting coefficient matrix satisfies: Pri f (f,k 2 )=M υ ′k 2 +π′(f); or, Pri f (f,k 2 )=K f π′(f)+k 2 ;or, Pri f (f,k 2 )=M v ′k 2 +f; or, At f (f,k 2 )=K f f+k 2 ; in, f represents the sequence number of the selected frequency domain basis, k 2 represents the serial number of the frequency domain feature basis, f=0,1,…,M v -1, k 2 =0,1,…,K f -1;Pri f (f,k 2 ) represents the frequency domain basis of the associated sequence number f and the sequence number k 2 The priority of the non-zero second weighting coefficient of the frequency domain feature basis; N3 represents the total number of the frequency domain basis, Represents the sequence number of the frequency domain basis of sequence number f among the N3 frequency domain basis.

8. The method according to any one of claims 1 to 7, characterized in that: The method further comprises: Sending second indication information to the access network device, where the second indication information includes a first bit map and a second bit map; The first bitmap is used to indicate the positions of the multiple non-zero first weighting coefficients in the first weighting coefficient matrix, and the second bitmap is used to indicate the positions of the multiple non-zero second weighting coefficients in the second weighting coefficient matrix.

9. The method according to claim 8, characterized in that The first indication information includes the first weighting coefficient matrix except K s The information bits of multiple non-zero first weighting coefficients other than the maximum non-zero first weighting coefficient corresponding to the spatial feature basis, and the information bits of the second weighting coefficient matrix except K f information bits of a plurality of non-zero second weighting coefficients other than the maximum non-zero second weighting coefficients respectively corresponding to the frequency domain characteristic bases; The information bits of the non-zero first weighting coefficients corresponding to the first spatial characteristic basis in the first weighting coefficient matrix are obtained by normalizing multiple non-zero first weighting coefficients corresponding to the first spatial characteristic basis based on the maximum non-zero first weighting coefficient corresponding to the first spatial characteristic basis; the first spatial characteristic basis is K s Any one of the spatial feature bases; The information bits of the non-zero second weighting coefficients corresponding to the first frequency domain characteristic basis in the second weighting coefficient matrix are obtained by normalizing multiple non-zero second weighting coefficients corresponding to the first frequency domain characteristic basis based on the maximum non-zero second weighting coefficient corresponding to the first frequency domain characteristic basis; the first frequency domain characteristic basis is K f Any frequency domain feature basis among the frequency domain feature basis.

10. The method according to any one of claims 1 to 9, characterized in that: Sending first indication information to the access network device includes: Periodically sending the first indication information to the access network device according to a first reporting period; The method further comprises: Periodically sending third indication information to the access network device according to a second reporting period, where the third indication information is used to indicate a third weighting coefficient matrix; The third weighting coefficient matrix and the K s The spatial feature basis and the K f The weighted sum of the frequency domain feature bases is used to determine the precoding matrix; The first reporting period is greater than the second reporting period.

11. A base feedback method, characterized in that: include: Receiving a reference signal from an access network device, the reference signal being used to indicate a space-frequency characteristic basis used by a terminal device for feedback; Sending fourth indication information to the access network device, where the fourth indication information is used to indicate a fourth weighting coefficient matrix; Among them, the fourth weighting coefficient matrix and G sf The weighted sum of the space-frequency bases is used to determine K sf A space-frequency characteristic basis; The reporting priority of the multiple non-zero fourth weighting coefficients included in the fourth weighting coefficient matrix is ​​related to the sequence number of the space-frequency basis associated with the non-zero fourth weighting coefficient and the sequence number of the space-frequency characteristic basis associated with the non-zero fourth weighting coefficient.

12. The method according to claim 11, characterized in that The fourth indication information includes at least J information bit groups out of N information bit groups, N is a positive integer, and J is a positive integer less than or equal to N; The nth information bit group in the N information bit groups includes K sfn The non-zero fourth weighting coefficient corresponding to the space-frequency characteristic basis Information bits, or The nth information bit group in the N information bit groups includes N sfn information bits of a non-zero fourth weighting coefficient, N sf Represents the total number of non-zero fourth weighting coefficients included in the fourth weighting coefficient matrix.

13. The method according to claim 12, characterized in that When n=1,2,…N-1, When n = N, or, When n=1,2,…N-1, When n = N, 14. The method according to claim 12 or 13, characterized in that Sending fourth indication information to the access network device includes: When the reported resource amount of the terminal device is greater than or equal to the resource amount of the N information bit groups, sending the N information bit groups to the access network device; or, When the reported resource amount of the terminal device is less than the resource amount of the N information bit groups, sending the first information bit group to the Jth information bit group of the N information bit groups to the access network device according to the reported resource amount; or, When the reported resource amount of the terminal device is less than the resource amount of the N information bit groups, the 1st information bit group to the Jth information bit group and part of the information bits of the J+1th information bit group are sent to the access network device according to the reported resource amount.

15. The method according to claim 11, characterized in that Sending fourth indication information to the access network device includes: When the reported resource amount of the terminal device is less than the resource amount of the information bits of the non-zero fourth weighting coefficients in the fourth weighting coefficient matrix, the information bits of some non-zero fourth weighting coefficients in the fourth weighting coefficient matrix are sent to the access network device according to the reported resource amount, the resource amount of the information bits of the some non-zero fourth weighting coefficients meets the reported resource amount of the terminal device, and the reporting priority of the some non-zero fourth weighting coefficients is higher than the reporting priority of the non-zero fourth weighting coefficients in the fourth weighting coefficient matrix except the some non-zero fourth weighting coefficients; or, When the reported resource amount of the terminal device is less than the resource amount of the information bits of the non-zero fourth weighting coefficients in the fourth weighting coefficient matrix, the information bits of the non-zero fourth weighting coefficients corresponding to the partial space-frequency characteristic basis in the fourth weighting coefficient matrix are sent to the access network device according to the reported resource amount; the partial space-frequency characteristic basis is the K sfn The space-frequency feature basis whose sequence number is less than g among the space-frequency feature basis.

16. The method according to any one of claims 11 to 15, characterized in that: The reporting priority of the plurality of non-zero fourth weighting coefficients included in the fourth weighting coefficient matrix satisfies: Pri sf (i,f,k 3 )=2L″k 3 π′(f)+2L″k+i; or, Pri(i,f,k 3 )=2L″N3k 3 +2L″π′(f)+i; in, G sf The space-frequency basis is composed of 2L″ space-domain basis and M v ″2L″M″ generated by a frequency domain basis v part or all of the space-frequency basis, i represents the sequence number of the spatial domain basis corresponding to the selected space-frequency basis, f represents the sequence number of the frequency domain basis corresponding to the selected space-frequency basis, k 3 Indicates the serial number of the space-frequency feature basis, i = 0, 1, ..., 2L"-1, f = 0, 1, ..., M v ″-1, k 3 =0,1,…,K sf -1; Pri(i,f,k 3 ) represents the frequency domain basis of the associated sequence number f, the sequence number k 3 The priority of the non-zero fourth weighting coefficient of the spatial-frequency characteristic basis and the spatial-domain basis of sequence number i, N3 represents the total number of the frequency-domain basis, Represents the sequence number of the frequency domain basis of sequence number f among the N3 frequency domain basis.

17. The method according to any one of claims 11 to 16, characterized in that: Sending fourth indication information to the access network device includes: Periodically sending the fourth indication information to the access network device according to the first reporting period; The method further comprises: Periodically sending fifth indication information to the access network device according to a second reporting period, where the fifth indication information is used to indicate a fifth weighting coefficient matrix; The fifth weighting coefficient matrix and the K sf The weighted sum of the space-frequency feature bases is used to determine the precoding matrix; The first reporting period is greater than the second reporting period.

18. A base feedback method, characterized in that: include: Sending a reference signal to a terminal device, where the reference signal is used to indicate a spatial domain feature basis and a frequency domain feature basis used for feedback by the terminal device; Receiving first indication information from the terminal device, where the first indication information is used to indicate a first weighting coefficient matrix and a second weighting coefficient matrix; The weighted sum of the first weighting coefficient matrix and the 2L′ spatial basis in the spatial basis set is used to determine K s The second weighting coefficient matrix and the M in the frequency domain basis set υ The weighted sum of the ′ frequency domain bases is used to determine K f frequency domain feature basis; The reporting priority of the plurality of non-zero first weighting coefficients in the first weighting coefficient matrix is ​​related to the sequence number of the spatial basis associated with the non-zero first weighting coefficient and the sequence number of the spatial feature basis associated with the first non-zero weighting coefficient; The reporting priority of the multiple non-zero second weighting coefficients in the second weighting coefficient matrix is ​​related to the sequence number of the frequency domain basis associated with the non-zero second weighting coefficient and the sequence number of the frequency domain characteristic basis associated with the non-zero second weighting coefficient.

19. The method according to claim 18, characterized in that The first indication information includes at least J information bit groups out of N information bit groups, where N is a positive integer and J is a positive integer less than or equal to N; The nth information bit group in the N information bit groups includes K sn The information bits and K of the non-zero first weighted coefficients corresponding to the spatial feature basis fn The information bits of the non-zero second weighting coefficients corresponding to the spatial feature basis; or, The nth information bit group in the N information bit groups includes l n The information bits and m of the non-zero first weighting coefficients corresponding to the spatial basis n The information bits of the non-zero second weighting coefficients corresponding to the spatial feature basis; or, The nth information bit group in the N information bit groups includes N sn The information bits of the non-zero first weighting coefficients and N fn information bits of a non-zero second weighting coefficient; or N s represents the total number of non-zero weighting coefficients included in the first weighting coefficient matrix, N f Represents the total number of non-zero weighting coefficients included in the second weighting coefficient matrix.

20. The method according to claim 18 or 19, characterized in that The reporting priority of the multiple non-zero first weighting coefficients included in the first weighting coefficient matrix satisfies: Pri s (i,k 1 )=2L′k 1 +i; or, Pri s (i,k 1 )=K s i+k 1 ; Where i represents the sequence number of the selected spatial basis, k 1 represents the serial number of the spatial feature basis, i = 0, 1, ..., 2L'-1; k 1 =0,1,…,K s -1;Pri s (i,k 1 ) represents the priority of the non-zero first weighted coefficient of the spatial basis of the association number i and the spatial feature basis of the association number k.

21. The method according to any one of claims 18 to 20, characterized in that The reporting priority of the plurality of non-zero second weighting coefficients included in the second weighting coefficient matrix satisfies: Pri f (f,k 2 )=M υ ′k 2 +π′(f); or, Pri f (f,k 2 )=K f π′(f)+k 2 or, Pri f (f,k 2 )=M υ ′k 2 +f; or, Pri f (f,k 2 )=K f f+k 2 ; in, f represents the sequence number of the selected frequency domain basis, k 2 represents the serial number of the frequency domain feature basis, f=0,1,…,M υ -1, k 2 =0,1,…,K f -1;Pri f (f,k 2 ) represents the frequency domain basis of the associated sequence number f and the sequence number k 2 The priority of the non-zero second weighting coefficient of the frequency domain feature basis; N3 represents the total number of the frequency domain basis, Represents the sequence number of the frequency domain basis of sequence number f among the N3 frequency domain basis.

22. The method according to any one of claims 18 to 21, characterized in that: The method further comprises: Receiving second indication information from the terminal device, where the second indication information includes a first bit map and a second bit map; The first bitmap is used to indicate the positions of the multiple non-zero first weighting coefficients in the first weighting coefficient matrix, and the second bitmap is used to indicate the positions of the multiple non-zero second weighting coefficients in the second weighting coefficient matrix.

23. The method of claim 22, wherein: The first indication information includes the first weighting coefficient matrix except K s The information bits of multiple non-zero first weighting coefficients other than the maximum non-zero first weighting coefficient corresponding to the spatial feature basis, and the information bits of the second weighting coefficient matrix except K f information bits of a plurality of non-zero second weighting coefficients other than the maximum non-zero second weighting coefficients respectively corresponding to the frequency domain characteristic bases; The information bits of the non-zero first weighting coefficients corresponding to the first spatial characteristic basis in the first weighting coefficient matrix are obtained by normalizing multiple non-zero first weighting coefficients corresponding to the first spatial characteristic basis based on the maximum non-zero first weighting coefficient corresponding to the first spatial characteristic basis; the first spatial characteristic basis is K s Any one of the spatial feature bases; The information bits of the non-zero second weighting coefficients corresponding to the first frequency domain characteristic basis in the second weighting coefficient matrix are obtained by normalizing multiple non-zero second weighting coefficients corresponding to the first frequency domain characteristic basis based on the maximum non-zero second weighting coefficient corresponding to the first frequency domain characteristic basis; the first frequency domain characteristic basis is K f Any frequency domain feature basis among the frequency domain feature basis.

24. A base feedback method, characterized in that: include: Sending a reference signal to a terminal device, where the reference signal is used to indicate a space-frequency characteristic basis used by the terminal device for feedback; Receiving fourth indication information from the terminal device, where the fourth indication information is used to indicate a fourth weighting coefficient matrix; Among them, the fourth weighting coefficient matrix and G sf The weighted sum of the space-frequency bases is used to determine K sf A space-frequency characteristic basis; The reporting priority of the multiple non-zero fourth weighting coefficients included in the fourth weighting coefficient matrix is ​​related to the sequence number of the space-frequency basis associated with the non-zero fourth weighting coefficient and the sequence number of the space-frequency characteristic basis associated with the non-zero fourth weighting coefficient.

25. The method of claim 24, wherein: The reporting priority of the plurality of non-zero fourth weighting coefficients included in the fourth weighting coefficient matrix satisfies: Pri sf (i,f,k 3 )=2L″k 3 π′(f)+2L″k+i; or, Pri(i,f,k 3 )=2L″N3k 3 +2L″π′(f)+i; in, G sf The space-frequency basis is composed of 2L″ space-domain basis and M υ ″2L″M″ generated by a frequency domain basis v part or all of the space-frequency basis, i represents the sequence number of the spatial domain basis corresponding to the selected space-frequency basis, f represents the sequence number of the frequency domain basis corresponding to the selected space-frequency basis, k 3 Indicates the serial number of the space-frequency feature basis, i = 0, 1, ..., 2L"-1, f = 0, 1, ..., M υ ″-1, k 3 =0,1,…,K sf -1; Pri(i,f,k 3 ) represents the frequency domain basis of the associated sequence number f, the sequence number k 3 The priority of the non-zero fourth weighting coefficient of the spatial-frequency characteristic basis and the spatial-domain basis of sequence number i, N3 represents the total number of the frequency-domain basis, Represents the sequence number of the frequency domain basis of sequence number f among the N3 frequency domain basis.

26. A communication device, characterized in that: The method comprises one or more modules or units for implementing the method steps described in any one of claims 1 to 25.

27. A communication device, characterized in that: The method comprises a processor and a memory, wherein the memory is used to store program instructions, and when the processor executes the program instructions, the method according to any one of claims 1 to 10 is executed, or the method according to any one of claims 11 to 17 is executed, or the method according to any one of claims 18 to 23 is executed, or the method according to any one of claims 24 to 25 is executed.

28. A chip, characterized in that: The chip is coupled to the memory and is used to read and execute program instructions stored in the memory to implement the method according to any one of claims 1 to 10, the method according to any one of claims 11 to 17, the method according to any one of claims 18 to 23, or the method according to any one of claims 24 to 25.

29. A computer-readable storage medium, characterized in that: The computer storage medium stores computer-readable instructions, and when the computer-readable instructions are executed on the communication device, the method according to any one of claims 1 to 10 is executed, or the method according to any one of claims 11 to 17 is executed, or the method according to any one of claims 18 to 23 is executed, or the method according to any one of claims 24 to 25 is executed.

30. A computer program product, characterized in that When the computer program product runs on a device, the device executes the method according to any one of claims 1 to 10, the method according to any one of claims 11 to 17, the method according to any one of claims 18 to 23, or the method according to any one of claims 24 to 25.

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