CN117792448A - Method for designing multi-band codebook and communication device - Google Patents
Method for designing multi-band codebook and communication device Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
Abstract
The application provides a method and a device for designing a multi-band codebook, wherein the method comprises the following steps: the terminal equipment determines a space-frequency joint characteristic public base according to a first channel matrix and a second channel matrix, wherein the first channel matrix is a channel matrix of a first frequency band measured by the terminal equipment, the second channel matrix is a channel matrix of a second frequency band measured by the terminal equipment, the first frequency band and the second frequency band are communication frequency bands of the terminal equipment and the network equipment, and the space-frequency joint characteristic public base is used for determining the space-frequency joint characteristic base of the first frequency band and the space-frequency joint characteristic base of the second frequency band; and the terminal equipment sends the information of the space-frequency joint characteristic public base to the network equipment. In the method, the terminal equipment performs joint characteristic base design on different frequency bands, and the terminal equipment only needs to feed back one public base for two frequency bands, so that the expense of feeding back the CSI by the terminal equipment is reduced.
Description
Technical Field
The present disclosure relates to the field of communications technologies, and in particular, to a method and a communications device for designing a multi-band codebook.
Background
Channel state information (channel state information, CSI) is information reported by a terminal to a base station in a wireless communication system that describes channel properties of a communication link. The base station may send a channel-state information reference signal (CSI-RS) to the terminal, where the terminal performs downlink channel measurement based on the CSI-RS sent by the base station to obtain CSI of a downlink channel, and report the CSI to the base station, and the base station schedules downlink data according to the CSI.
A massive multiple-input multiple-output (massive MIMO) system can achieve significant improvement of spectrum efficiency through massive antennas, and accuracy of CSI obtained by a base station determines performance of the massive MIMO to a great extent, so characteristic information of a channel is typically represented by a codebook. When the channel characteristic information is represented by the codebook, the original channel characteristic needs to be approximated as much as possible under the allowable cost, so that the channel quantization is more accurate.
In order to further increase the capacity of the system, the multi-frequency fusion technology has been developed, the terminal supports multiple frequency bands at the same time, and the base station can send downlink data to the terminal through the multiple frequency bands. Because of the difference of the channels in different frequency bands, in order to support the multi-band to send downlink data for the same terminal, the base station needs to acquire the CSI of each frequency band. In the prior art, a terminal needs to independently perform codebook design and CSI reporting for different frequency bands. As the number of frequency bands supported by the terminal becomes more and more, the reporting cost of the terminal is multiplied, and how to reduce the reporting cost of the terminal becomes a problem to be solved.
Disclosure of Invention
The application provides a method and a communication device for designing a multi-band codebook, which can reduce the expenditure of reporting CSI by a terminal.
In a first aspect, a method for designing a multi-band codebook is provided, which may be performed by a terminal device, or may also be performed by a chip or a circuit configured in the terminal device, which is not limited in this application.
The method comprises the following steps: the terminal equipment determines a space-frequency joint characteristic public base according to a first channel matrix and a second channel matrix, wherein the first channel matrix is a channel matrix of a first frequency band measured by the terminal equipment, the second channel matrix is a channel matrix of a second frequency band measured by the terminal equipment, the first frequency band and the second frequency band are communication frequency bands of the terminal equipment and the network equipment, and the space-frequency joint characteristic public base is used for determining the space-frequency joint characteristic base of the first frequency band and the space-frequency joint characteristic base of the second frequency band; and the terminal equipment sends information for indicating the space-frequency joint characteristic public base to the network equipment.
In the technical scheme, the terminal equipment performs joint characteristic base design on different frequency bands, and only one public base needs to be fed back by the terminal equipment aiming at two frequency bands, so that the expense of the terminal equipment for feeding back the CSI is reduced.
In certain implementations of the first aspect, the determining, by the terminal device, a space-frequency joint feature common base according to the first channel matrix and the second channel matrix includes: the terminal equipment determines a first space-frequency joint channel covariance matrix according to the first channel matrix, and determines a second space-frequency joint channel covariance matrix according to the second channel matrix; and the terminal equipment determines a space-frequency joint characteristic public base according to the first space-frequency joint channel covariance matrix and the second space-frequency joint channel covariance matrix.
In the technical scheme, the terminal equipment performs joint feature base design based on the corresponding space-frequency joint channel covariance matrix of the two frequency bands, and only one common base needs to be fed back by the terminal equipment aiming at the two frequency bands, so that the expense of the terminal equipment for feeding back the CSI is reduced.
In certain implementations of the first aspect, the number N of antenna ports corresponding to a single polarization direction of the first frequency band t1 And/2 is greater than or equal to the number N of antenna ports corresponding to the single polarization direction of the second frequency band t2 2, and the number of sub-bands B1 corresponding to the first frequency band is greater than or equal to the number of sub-bands corresponding to the second frequency bandB2; the terminal equipment determines a space-frequency joint characteristic public base according to the first space-frequency joint channel covariance matrix and the second space-frequency joint channel covariance matrix, and comprises the following steps: the terminal equipment performs bit summation on the first space-frequency joint channel covariance matrix and the second space-frequency joint channel covariance matrix according to a first rule, and determines a space-frequency joint channel statistical covariance matrix according to the summed matrix; the terminal equipment determines a singular matrix according to a space-frequency combined channel statistical covariance matrix, and selects the front L columns of the singular matrix as a space-frequency combined characteristic public base, wherein L is smaller than or equal to B1N t1 2 and B2 x N t2 Smaller value in/2.
The space-frequency joint channel statistical covariance matrix obtained in the scheme can contain information of each sub-band of the first frequency band and the second frequency band, namely the space-frequency joint characteristic public base can contain information of each sub-band of the first frequency band and the second frequency band, so that joint characteristic base design is realized for the two frequency bands, and the terminal equipment only needs to feed back one public base for the two frequency bands, thereby reducing the expense of the terminal equipment for feeding back the CSI.
In the technical scheme, the terminal equipment only needs to perform one singular value decomposition on the acquired space-frequency combined channel statistical covariance matrix to acquire the space-frequency combined characteristic public base, so that the calculation complexity of the terminal equipment can be reduced.
In certain implementations of the first aspect, N t1 2 is equal to N t2 And/2, B1 is greater than B2, the first rule indicates information of B2 subbands used for calculating a space-frequency joint channel statistical covariance matrix in B1 subbands of the first frequency band, and the terminal device performs bit summation on the first space-frequency joint channel covariance matrix and the second space-frequency joint channel covariance matrix according to the first rule, including: n corresponding to each of the B2 sub-bands in the covariance matrix of the second space-frequency joint channel t2 2 lines of N respectively corresponding to each of the B2 sub-bands of the first frequency band indicated by the first rule in the first space-frequency joint channel covariance matrix according to the sequence t1 And/2 rows are sequentially aligned and added.
In certain implementations of the first aspect, N t1 With/2 greater than N t2 2, and B1 is equal to B2, the first rule indicating B2 x B2 actions N contained in the second covariance matrix t2 2, column N t2 Adding row information and column information of 0 elements in each square matrix in the square matrix of/2, and carrying out bit summation on a first space-frequency joint channel covariance matrix and a second space-frequency joint channel covariance matrix by the terminal equipment according to a first rule, wherein the bit summation comprises the following steps: determining a third space-frequency joint channel covariance matrix, which is B2 x B2 behaviors N contained in the second covariance matrix t2 2, column N t2 Each of the/2 square arrays increases N in accordance with the row information and the column information indicated by the first rule t1 /2-N t2 Row/2 and N t1 /2-N t2 2 columns of matrix generated after 0 elements; n corresponding to each of the B2 sub-bands in the third space-frequency joint channel covariance matrix t1 N of each of the B1 sub-bands in the first space-frequency combined channel covariance matrix is respectively corresponding to the 2 rows according to the sequence t1 And/2 rows are sequentially aligned and added.
In certain implementations of the first aspect, N t1 With/2 greater than N t2 2 and B1 is greater than B2, the first rule indicating information of B2 subbands used for calculating a space-frequency joint channel statistical covariance matrix among B1 subbands of the first frequency band, and B2 x B2 behaviors N contained in the second covariance matrix t2 2, column N t2 Adding row information and column information of 0 elements in each square matrix in the square matrix of/2, and carrying out bit summation on a first space-frequency joint channel covariance matrix and a second space-frequency joint channel covariance matrix by the terminal equipment according to a first rule, wherein the bit summation comprises the following steps: determining a fourth space-frequency joint channel covariance matrix, which is B2 x B2 behaviors N to be contained in the second covariance matrix t2 2, column N t2 Each of the square matrices of/2 increases N in accordance with the row information and the column information indicated by the first rule t1 /2-N t2 Row/2 and N t1 /2-N t2 2 columns of matrix generated after 0 elements; n corresponding to each of the B2 sub-bands in the fourth space-frequency joint channel covariance matrix t1 Line per/2N respectively corresponding to each of the B2 sub-bands of the first frequency band indicated by the first rule in the sequence and the first space-frequency joint channel covariance matrix t1 And/2 rows are sequentially aligned and added.
In certain implementations of the first aspect, N t1 2 is equal to N t2 And/2, and B1 is equal to B2, the terminal device performing bit summation on the first space-frequency joint channel covariance matrix and the second space-frequency joint channel covariance matrix according to a first rule, including: n corresponding to each of the B2 sub-bands in the covariance matrix of the second space-frequency joint channel t1 N of each of the B1 sub-bands in the first space-frequency combined channel covariance matrix is respectively corresponding to the 2 rows according to the sequence t2 And/2 rows are sequentially aligned and added.
In certain implementations of the first aspect, the method further comprises: the terminal equipment receives first indication information sent by the network equipment, wherein the first indication information comprises a first rule, and the first indication information is used for indicating the terminal equipment to carry out bit summation on a first space-frequency joint channel covariance matrix and a second space-frequency joint channel covariance matrix according to the first rule.
In certain implementations of the first aspect, the method further comprises: the terminal equipment sends second indication information to the network equipment, wherein the second indication information comprises a first rule, and the second indication information indicates the network equipment to intercept the space-frequency joint characteristic public base according to the first rule so as to acquire the space-frequency joint characteristic base of the second frequency band.
In certain implementations of the first aspect, the information for indicating a spatial-frequency joint feature common base includes: index numbers of the discrete Fourier transform basis vectors corresponding to the oversampling groups and projection coefficients of the space-frequency joint characteristic public base on the discrete Fourier transform basis vectors.
In a second aspect, a method of multi-band codebook design is provided, which may be performed by a network device, or may also be performed by a chip or circuit configured in the network device, which is not limited in this application.
The method comprises the following steps: the network equipment receives information used for indicating a space-frequency joint characteristic public base from the terminal equipment, wherein the space-frequency joint characteristic public base is determined by the terminal equipment according to a first channel matrix and a second channel matrix, the first channel matrix is a channel matrix of a first frequency band measured by the terminal equipment, the second channel matrix is a channel matrix of a second frequency band measured by the terminal equipment, and the first frequency band and the second frequency band are communication frequency bands of the network equipment and the terminal equipment; and the network equipment determines the space-frequency joint characteristic base of the first frequency band and the space-frequency joint characteristic base of the second frequency band according to the information for indicating the space-frequency joint characteristic public base.
The advantageous effects of the second aspect are described with reference to the first aspect, and are not described here again.
In certain implementations of the second aspect, the spatial-frequency joint characteristic common base is determined from a first spatial-frequency joint channel covariance matrix determined from the first channel matrix and a second spatial-frequency joint channel covariance matrix determined from the second spatial-frequency joint channel covariance matrix.
In the technical scheme, the space-frequency joint characteristic public base is obtained by designing the joint characteristic base based on the corresponding space-frequency joint channel covariance matrixes of the two frequency bands, so that the expense of feedback CSI is reduced.
In certain implementations of the second aspect, the number N of antenna ports corresponding to a single polarization direction of the first frequency band t1 And/2 is greater than or equal to the number N of antenna ports corresponding to the single polarization direction of the second frequency band t2 And/2, wherein the number of sub-bands B1 corresponding to the first frequency band is greater than or equal to the number of sub-bands B2 corresponding to the second frequency band, the common base of the space-frequency joint features is formed by the front L columns of a singular matrix, the singular matrix is obtained by singular value decomposition of a space-frequency joint channel statistical covariance matrix, the space-frequency joint channel statistical covariance matrix is obtained by carrying out bit summation on the first space-frequency joint channel covariance matrix and the second space-frequency joint channel covariance matrix according to a first rule, and filtering update is carried out on the summed matrix, wherein L is smaller than or equal to B1N t1 2 and B2 x N t2 A smaller value in/2; the network equipment determines a space-frequency joint characteristic base of a first frequency band and a space-frequency joint characteristic base of a second frequency band according to the space-frequency joint characteristic public base, and comprises the following steps: the network equipment determines a space-frequency joint characteristic public substrate as a space-frequency joint characteristic substrate of a first frequency band; and the network equipment performs element selection on the space-frequency joint characteristic public base according to a first rule to determine the space-frequency joint characteristic base of the second frequency band.
The space-frequency joint channel statistical covariance matrix obtained in the scheme can contain information of each sub-band of the first frequency band and the second frequency band, namely the space-frequency joint characteristic public base can contain information of each sub-band of the first frequency band and the second frequency band, so that joint characteristic base design can be carried out on the two frequency bands, and the expense of feedback CSI is reduced.
In certain implementations of the second aspect, N t1 2 is equal to N t2 And/2, B1 is greater than B2, the first rule indicates information of B2 subbands used for calculating a space-frequency joint channel statistical covariance matrix in B1 subbands of the first frequency band, and the network device performs element selection on the space-frequency joint feature public base according to the first rule to determine a space-frequency joint feature base of the second frequency band, wherein the method comprises the following steps: B2×N of common base of space-frequency joint characteristic t2 Line/2 is determined as the space-frequency joint characteristic base of the second frequency band, wherein B2 is N t2 N corresponding to each of the B2 sub-bands of the first frequency band indicated by the first rule in the space-frequency joint channel statistical covariance matrix t1 Row/2.
In the above technical solution, when designing the joint feature base for different frequency bands, two frequency bands share a feature base, and if bandwidths corresponding to the two frequency bands are different, the feature base of the frequency band with fewer subbands (i.e., the second frequency band) can be obtained by cutting off the feature base of the frequency band with more subbands (i.e., the first frequency band).
In certain implementations of the second aspect, N t1 With/2 greater than N t2 2, and B1 is equal to B2, the first rule indicating B2 x B2 actions N contained in the second covariance matrix t2 2, column N t2 Square matrix of/2Adding row information and column information of 0 elements in each square matrix, and carrying out element selection on the space-frequency joint characteristic public base by the network equipment according to a first rule to determine the space-frequency joint characteristic base of a second frequency band, wherein the method comprises the following steps: B2×N in space-frequency joint characteristic public base t2 Extracting elements in row/2, B2.times.N t2 N corresponding to each of the B2 sub-bands of the second frequency band in the third space-frequency combined channel covariance matrix in the space-frequency combined channel statistical covariance matrix t2 Row/2, wherein the third space-frequency joint channel covariance matrix is B2 x B2 behaviors N contained in the second covariance matrix t2 2, column N t2 The square matrix of/2 increases N according to the row information and the column information indicated by the first rule t1 /2-N t2 Row/2 and N t1 /2-N t2 Matrix generated after 2 columns of 0 elements, N corresponding to each of the B2 subbands of the second frequency band in the space-frequency joint channel statistical covariance matrix respectively t2 N corresponding to each of the B2 sub-bands excluding the second frequency band in the space-frequency joint channel statistical covariance matrix t1 Row of 0 element added in row/2; and splicing the extracted elements to obtain a space-frequency joint characteristic substrate of the second frequency band.
In the above technical solution, when the joint feature base is designed for different frequency bands, two frequency bands share a common feature base, and if the number of antenna ports used in measurement of the two frequency bands is different, the feature base of the frequency band with fewer ports can be obtained by extracting the feature base of the frequency band with more ports.
In certain implementations of the second aspect, N t1 With/2 greater than N t2 2 and B1 is greater than B2, the first rule indicating information of B2 subbands used for calculating a space-frequency joint channel statistical covariance matrix among B1 subbands of the first frequency band, and B2 x B2 behaviors N contained in the second covariance matrix t2 2, column N t2 Adding row information and column information of 0 elements in each square matrix in the/2 square matrixes, and carrying out element selection on the space-frequency joint characteristic public base by network equipment according to a first rule to determine the space-frequency joint characteristic of a second frequency bandA substrate, comprising: B2×N of common base of space-frequency joint characteristic t1 Line/2 is defined as a third space-frequency joint feature base, wherein, B2 is N t1 N corresponding to B2 sub-bands of the second frequency band in the fourth space-frequency joint channel covariance matrix t1 The row/2 corresponds to the row in the space-frequency combined channel statistical covariance matrix, and the fourth space-frequency combined channel covariance matrix is B2 x B2 rows N contained in the second space-frequency combined channel covariance matrix t2 2, column N t2 Each of the square matrices of/2 increases N in accordance with the row information and the column information indicated by the first rule t1 /2-N t2 Row/2 and N t1 /2-N t2 2 columns of matrix generated after 0 elements; for B2 and N in the third space-frequency joint characteristic public substrate t2 Extracting elements in row/2, B2.times.N t2 N corresponding to each of the B2 sub-bands of the second frequency band in the fourth space-frequency combined channel covariance matrix in the space-frequency combined channel statistical covariance matrix t2 Row/2, each of the B2 subbands of the second band corresponds to N in the space-frequency joint channel statistical covariance matrix, respectively t2 N corresponding to each of the B2 sub-bands excluding the second frequency band in the space-frequency joint channel statistical covariance matrix t1 Row of 0 element added in row/2; and splicing the extracted elements to obtain a space-frequency joint characteristic substrate of the second frequency band.
In certain implementations of the second aspect, N t1 2 is equal to N t2 And/2, and B1 is greater than B2, the network device performing element selection on the spatial-frequency joint feature common base according to a first rule to determine a spatial-frequency joint feature base of a second frequency band, including: and the network equipment determines the space-frequency joint characteristic public base as the space-frequency joint characteristic base of the second frequency band.
In certain implementations of the second aspect, the method further comprises: the network device sends first indication information to the terminal device, wherein the first indication information comprises a first rule, and the first indication information is used for indicating the terminal device to carry out bit summation on a first space-frequency joint channel covariance matrix and a second space-frequency joint channel covariance matrix according to the first rule.
In certain implementations of the second aspect, the method further comprises: the network equipment receives second indication information from the terminal equipment, the second indication information comprises a first rule, and the second indication information indicates the network equipment to process the space-frequency joint characteristic public base according to the first rule so as to obtain a space-frequency joint characteristic base of a second frequency band.
In certain implementations of the second aspect, the information for indicating a spatial-frequency joint feature common base includes: index numbers of the discrete Fourier transform basis vectors corresponding to the oversampling groups and projection coefficients of the space-frequency joint characteristic public base on the discrete Fourier transform basis vectors.
In a third aspect, a communication device is provided for performing the method provided in the first aspect above. In particular, the apparatus may comprise means and/or modules, such as a processing unit and/or a communication unit, for performing the method of the first aspect and any of the possible implementations of the first aspect.
In one implementation, the apparatus is a terminal device. When the apparatus is a terminal device, the communication unit may be a transceiver, or an input/output interface; the processing unit may be at least one processor. Alternatively, the transceiver may be a transceiver circuit. Alternatively, the input/output interface may be an input/output circuit.
In another implementation, the apparatus is a chip, a system-on-chip, or a circuit for use in a terminal device. When the apparatus is a chip, a system-on-chip or a circuit used in a terminal device, the communication unit may be an input/output interface, an interface circuit, an output circuit, an input circuit, a pin or a related circuit, etc. on the chip, the system-on-chip or the circuit; the processing unit may be at least one processor, processing circuit or logic circuit, etc.
In a fourth aspect, a communication device is provided for performing the method provided in the second aspect. In particular, the apparatus may comprise means and/or modules, such as a processing unit and/or a communication unit, for performing the method of the second aspect and any one of the possible implementations of the second aspect.
In one implementation, the apparatus is a network device. When the apparatus is a network device, the communication unit may be a transceiver, or an input/output interface; the processing unit may be at least one processor. Alternatively, the transceiver may be a transceiver circuit. Alternatively, the input/output interface may be an input/output circuit.
In another implementation, the apparatus is a chip, a system-on-chip, or a circuit for use in a network device. When the apparatus is a chip, a system-on-chip or a circuit used in a terminal device, the communication unit may be an input/output interface, an interface circuit, an output circuit, an input circuit, a pin or a related circuit, etc. on the chip, the system-on-chip or the circuit; the processing unit may be at least one processor, processing circuit or logic circuit, etc.
In a fifth aspect, there is provided a communication apparatus comprising: comprising at least one processor coupled to at least one memory for storing a computer program or instructions, the at least one processor for invoking and running the computer program or instructions from the at least one memory to cause the communication device to perform the method of the first aspect and any possible implementation of the first aspect.
In one implementation, the apparatus is a terminal device.
In another implementation, the apparatus is a chip, a system-on-chip, or a circuit for use in a terminal device.
In a sixth aspect, there is provided a communication apparatus comprising: comprising at least one processor coupled to at least one memory for storing a computer program or instructions, the at least one processor for invoking and running the computer program or instructions from the at least one memory to cause a communication device to perform the method of the second aspect and any one of the possible implementations of the second aspect.
In one implementation, the apparatus is a network device.
In another implementation, the apparatus is a chip, a system-on-chip, or a circuit for use in a network device.
In a seventh aspect, a processor is provided for performing the method provided in the above aspects.
The operations such as transmitting and acquiring/receiving, etc. related to the processor may be understood as operations such as outputting and receiving, inputting, etc. by the processor, or may be understood as operations such as transmitting and receiving by the radio frequency circuit and the antenna, if not specifically stated, or if not contradicted by actual function or inherent logic in the related description, which is not limited in this application.
In an eighth aspect, a computer readable storage medium is provided, the computer readable storage medium storing program code for device execution, the program code comprising instructions for performing the method of any one of the above-described first aspects and possible implementations of the first aspect.
A ninth aspect provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of the second aspect and any one of the possible implementations of the second aspect.
In a tenth aspect, a chip is provided, the chip comprising a processor and a communication interface, the processor reading instructions stored on a memory via the communication interface, performing the method of the first aspect and any one of the possible implementations of the first aspect.
Optionally, as an implementation manner, the chip further includes a memory, where a computer program or an instruction is stored in the memory, and the processor is configured to execute the computer program or the instruction stored on the memory, and when the computer program or the instruction is executed, the processor is configured to perform the method in any one of the possible implementation manners of the first aspect and the first aspect.
In an eleventh aspect, a chip is provided, the chip comprising a processor and a communication interface, the processor reading instructions stored on a memory through the communication interface, performing the method of the second aspect and any one of the possible implementations of the second aspect.
Optionally, as an implementation manner, the chip further includes a memory, where a computer program or an instruction is stored in the memory, and the processor is configured to execute the computer program or the instruction stored on the memory, and when the computer program or the instruction is executed, the processor is configured to perform the method in any one of the second aspect and the possible implementation manners of the second aspect.
In a twelfth aspect, there is provided a communication system including the communication apparatus shown in the fifth aspect and the sixth aspect.
Drawings
FIG. 1 is a schematic diagram of a communication system suitable for use in embodiments of the present application;
FIG. 2 is a modular block diagram of the various network elements of FIG. 1;
fig. 3 is a schematic diagram of a basic flow of a network device acquiring downlink channel CSI in a conventional FDD system;
FIG. 4 is a schematic flow chart of a method of multi-band codebook design as proposed herein;
FIG. 5 is a schematic diagram of a first and second space-frequency joint channel covariance matrices generated when the number of antenna ports corresponding to a single polarization direction of a first frequency band and a second frequency band is the same, but the number of corresponding sub-bands is different;
FIG. 6 is a schematic diagram of adding a first and a second spatial-frequency joint channel covariance matrix in the scenario of FIG. 5 according to an element alignment rule;
FIG. 7 is a schematic diagram of adding a first and a second spatial-frequency joint channel covariance matrix in the scenario of FIG. 5 according to another element alignment rule;
FIG. 8 is a schematic diagram of a first and second space-frequency joint channel covariance matrices generated when the number of antenna ports corresponding to a single polarization direction of a first frequency band and a second frequency band are different, but the number of corresponding sub-bands are the same;
FIG. 9 is a schematic diagram of a matrix generated by adding 0 elements to a second space-frequency joint channel covariance matrix in the scenario of FIG. 8 according to an element alignment rule;
FIG. 10 is a schematic diagram of a matrix generated by adding 0 elements to a second spatial-frequency joint channel covariance matrix in the scenario of FIG. 8 according to another element alignment rule;
FIG. 11 is a schematic diagram of a first and a second space-frequency joint channel covariance matrices generated when the number of antenna ports corresponding to a single polarization direction of a first frequency band and a second frequency band are different and the number of corresponding sub-bands are also different;
FIG. 12 is a schematic diagram of a matrix generated by adding 0 elements to a second space-frequency joint channel covariance matrix in the scenario of FIG. 11 according to an element alignment rule;
FIG. 13 is a schematic diagram of adding the first spatial-frequency joint channel covariance matrix in the scenario of FIG. 11 and the second spatial-frequency joint channel covariance matrix in FIG. 12 according to an element alignment rule;
FIG. 14 is a schematic illustration of a space-frequency joint feature common base obtained on the basis of the matrix shown in FIG. 6;
FIG. 15 is a schematic illustration of a spatial-frequency joint feature common base obtained on the basis of the matrices of FIGS. 8 and 10;
FIG. 16 is a schematic illustration of a spatial-frequency joint feature common base obtained on the basis of the matrix shown in FIG. 13;
fig. 17 is a schematic block diagram of a communication device 200 provided herein;
fig. 18 is a schematic structural diagram of a communication device 300 provided in the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application more apparent, the embodiments of the present application will be described in further detail with reference to the accompanying drawings.
The technical solution of the embodiment of the application can be applied to various communication systems, for example: global system for mobile communications (global system for mobile communications, GSM), code division multiple access (code division multiple access, CDMA) system, wideband code division multiple access (wideband code division multiple access, WCDMA) system, general packet radio service (general packet radio service, GPRS), long term evolution (long term evolution, LTE) system, LTE frequency division duplex (frequency division duplex, FDD) system, LTE time division duplex (time division duplex, TDD), universal mobile telecommunications system (universal mobile telecommunication system, UMTS), worldwide interoperability for microwave access (worldwide interoperability for microwave access, wiMAX) communication system, fifth generation (5th generation,5G) communication system, new radio access technology (new radio access technology, NR), future communication systems such as sixth generation (6th generation,6G) communication system, and the like.
To facilitate an understanding of the embodiments of the present application, a communication system suitable for use in the embodiments of the present application will be described in detail with reference to fig. 1.
Fig. 1 is a schematic diagram of a communication system suitable for use in embodiments of the present application. As shown in fig. 1, the communication system 100 may include at least one network device, such as the network device 110 shown in fig. 1; the communication system 100 may also include at least one terminal device, such as the terminal device 120 shown in fig. 1. Network device 110 and terminal device 120 may communicate via a wireless link. Each communication device, such as network device 110 or terminal device 120, may be configured with a plurality of antennas that may include at least one transmit antenna for transmitting signals and at least one receive antenna for receiving signals. In addition, each communication device may additionally include a transmitter chain and a receiver chain, each of which may include a plurality of components (e.g., processors, modulators, multiplexers, demodulators, demultiplexers, antennas, etc.) associated with the transmission and reception of signals, as will be appreciated by one skilled in the art. Thus, network device 110 and terminal device 120 may communicate via multiple antenna techniques.
It should be understood that the network device in the wireless communication system may be any device having a wireless transceiving function. The apparatus includes, but is not limited to: an evolved NodeB (eNB or eNodeB), a radio network controller (radio network controller, RNC), a NodeB (Node B, NB), a base station controller (base station controller, BSC), a base transceiver station (base transceiver station, BTS), a home base station (e.g., home evolved NodeB, or home Node B, HNB), a Base Band Unit (BBU), an Access Point (AP) in a wireless fidelity (wireless fidelity, WIFI) system, a wireless relay Node, a wireless backhaul Node, a transmission point (transmission point, TP), or a transmission reception point (transmission and reception point, TRP), etc., may also be 5G, e.g., NR, a gNB in a system, or a transmission point (TRP or TP), one or a group (including multiple antenna panels) of base stations in a 5G system, or may also be a network Node constituting a gNB or transmission point, e.g., a baseband unit (BBU), or a Distributed Unit (DU), etc.
In some deployments, the gNB may include a Centralized Unit (CU) and DUs. The gNB may also include a Radio Unit (RU). The CU implements part of the functions of the gNB, the DU implements part of the functions of the gNB, for example, the CU implements functions of a radio resource control (radio resource control, RRC), a packet data convergence layer protocol (packet data convergence protocol, PDCP) layer, and the DU implements functions of a radio link control (radio link control, RLC), a medium access control (media access control, MAC), and a Physical (PHY) layer. Since the information of the RRC layer may eventually become information of the PHY layer or be converted from the information of the PHY layer, under this architecture, higher layer signaling, such as RRC layer signaling, may also be considered to be transmitted by the DU or by the du+cu. It is understood that the network device may be a CU node, or a DU node, or a device comprising a CU node and a DU node. In addition, the CU may be divided into network devices in an access network (radio access network, RAN), or may be divided into network devices in a Core Network (CN), which is not limited in this application.
It should also be appreciated that the terminal device in the wireless communication system may also be referred to as a User Equipment (UE), an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent, or a user equipment. The terminal device in the embodiment of the present application may be a mobile phone (mobile phone), a tablet computer (pad), a computer with a wireless transceiving function, a Virtual Reality (VR) terminal device, an augmented reality (augmented reality, AR) terminal device, a wireless terminal in industrial control (industrial control), a wireless terminal in unmanned driving (self driving), a wireless terminal in remote medical (remote medical), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation security (transportation safety), a wireless terminal in smart city (smart city), a wireless terminal in smart home (smart home), or the like. The embodiments of the present application are not limited to application scenarios.
Fig. 2 is a modular block diagram of the various network elements of fig. 1. As shown in fig. 2, in the embodiment of the present application, the network device 110 includes an RRC signaling interaction module, a MAC signaling interaction module, and a PHY signaling and data interaction module. The terminal device 120 also includes an RRC signaling interaction module, a MAC signaling interaction module, and a PHY signaling and data interaction module. The RRC signaling interaction module of the network device 110 is in communication connection with the RRC signaling interaction module of the terminal device 120, so as to implement transmission and reception of RRC signaling. The MAC signaling exchange module of the network device 110 is communicatively connected to the MAC signaling exchange module of the terminal device 120, so as to implement transmission and reception of the MAC control element (MAC control element, MAC-CE) signaling.
The PHY signaling and data interaction module of the network device 110 is communicatively coupled to the PHY signaling and data interaction module of the terminal device 120 to enable the network device 110 to transmit a physical downlink control channel (physical downlink control channel, PDCCH) and a physical downlink shared channel (physical downlink shared channel, PDSCH) to the terminal device 120. And also enables the network device 110 to receive the physical uplink control channel (physical uplink control channel, PUCCH) and the physical uplink shared channel (physical uplink shared channel, PUSCH) from the terminal device 120.
To facilitate understanding of the embodiments of the present application, a brief description of related art content referred to in the present application will be first provided.
The 5G communication system has higher requirements on the aspects of system capacity, spectrum efficiency and the like, and for a massive MIMO system of FDD, accurate acquisition of downlink CSI is one of key factors for ensuring the efficient operation of the system. Different from a TDD system, the FDD system has larger frequency point interval between the uplink channel and the downlink channel, so that the FDD system cannot acquire the complete downlink channel through uplink channel estimation.
Fig. 3 is a schematic diagram of a basic flow of a network device acquiring downlink channel CSI in a conventional FDD system. In a conventional FDD system, a terminal device is required to feed back CSI of a downlink channel to a network device (e.g., a base station or a gNB), and the basic flow is shown in fig. 3. The network device needs to send channel measurement configuration information to the terminal device first, so as to configure the channel measurement, for example, inform the terminal device of the time and behavior of the channel measurement. The network device then transmits CSI-RS (also commonly referred to as pilot) to the terminal device for channel measurements. And the terminal equipment measures the channel according to the received CSI-RS, calculates the final CSI feedback quantity, and feeds back the CSI of the downlink channel to the network equipment. The network device determines precoding information of the downlink data according to the CSI fed back by the terminal device, so as to perform precoding and sending of the downlink data, that is, the network device may schedule the downlink data according to the fed back CSI, for example, transmit PDCCH and PDSCH to the terminal device.
CSI is information describing channel properties of a communication link reported by a receiving end (e.g., a terminal device) to a transmitting end (e.g., a network device) in a wireless communication system. In the 5G communication system, CSI includes, but is not limited to, various parameters such as Channel Quality Indicator (CQI), precoding Matrix Indicator (PMI), rank Indicator (RI), CSI-RS resource indicator (CSI-RS resource indicator, CRI), layer Indicator (LI), and the like. It should be understood that the above listed details of CSI are merely exemplary and should not be construed as limiting the present application in any way. The CSI may include one or more of the above listed items, and may also include other information for characterizing CSI in addition to the above listed items, which is not limited in this application.
In order to support high-precision CSI feedback to improve performance of a multi-user multiple-input multiple-output (MU-MIMO) system, a two-stage codebook reporting scheme based on a channel statistics covariance matrix is discussed in a R18 cooperative joint transmission (coherent joint transmission, cqt) codebook standardization process, and the scheme mainly includes the following steps:
step 1: and the terminal equipment acquires the channel of the downlink subband dimension according to the measurement of the downlink CSI-RS.
It should be understood that the difference between the maximum frequency and the minimum frequency in one channel is the channel bandwidth, and the channel bandwidth of one channel may be divided into multiple frequency domain resource sets, and each frequency domain resource set is one subband. Each sub-band corresponds to a plurality of Resource Blocks (RBs), where an RB is one resource block formed by all orthogonal frequency division multiplexing (orthogonal frequency division multiplexing, OFDM) symbols in one slot and 12 subcarriers in the frequency domain.
The terminal equipment estimates and obtains a downlink channel H of the RB level according to the CSI-RS measurement ideal (k)：
Wherein N is Rx Indicating the number of receiving antennas of the terminal equipment, N Tx Representing the number of CSI-RS ports, N RB The number of RBs in the frequency domain is represented.
Then, the downlink channel of the RB level is averaged through the RBs in the sub-band to obtain the downlink channel of the sub-band dimension
Wherein,number of RBs, N, for one subband SB The number of subbands in the frequency domain.
Optionally, in this step, a downlink channel of any RB level in a subband may be selected as a channel of the subband dimension of the subband.
Step 2: and acquiring a space-frequency joint characteristic substrate. The terminal equipment performs singular value decomposition (singular value decomposition, SVD) on the space-frequency combined channel statistical covariance matrix to obtain a singular matrix, and takes the front L columns in the singular matrix as a space-frequency combined characteristic base according to preset or configured L.
The terminal equipment transmits a subband dimension channel to the obtained subband dimension downlink channel according to the number N of CSI-RS ports in each polarization direction Tx First, a corresponding behavior N is obtained Tx 2, column N Rx Is then divided into N SB Behavior N corresponding to each sub-band dimension channel Tx 2, column N Rx The matrixes of the (B) are spliced according to rows to finish matrix rearrangement to obtain a channel matrix corresponding to two polarization directionsAnd->And obtaining a space-frequency joint channel covariance matrix R of polarization average by using the channel matrix:
according to the periodic CSI-RS measurement, the terminal equipment continuously carries out filtering update (alpha is a filtering factor) on a space-frequency combined channel covariance matrix of a channel, and if the period of the CSI-RS is deltat, the space-frequency combined channel statistical covariance matrix which is continuously updated is:
wherein,||A|| F the Frobenius norm, representing matrix a, is defined as the sum of the squares of the absolute values of the individual elements of matrix a.
Setting a space-frequency joint characteristic substrate updating period T 0 Space-frequency joint channel statistical covariance matrix according to update periodSVD decomposition is carried out: />
Taking the first L feature vectors to obtain a space-frequency combined feature substrate(common for both polarization directions).
Step 3: space-frequency joint characteristic base projection compression, because the overhead of directly feeding back the space-frequency joint characteristic base to the base station by the terminal equipment is large, the space-frequency joint characteristic base is projected on a group of discrete Fourier transform (discrete Fourier transform, DFT) orthogonal basis vector subspaces, the terminal equipment only needs to feed back a long-period feedback quantity, and the long-period feedback quantity comprises a long-period projection coefficient C of the space-frequency joint characteristic base projected in the DFT orthogonal basis vector subspace 13 An index number of the selected set of oversampling and the selected DFT basis vector.
For the obtained projection coefficient C 13 The terminal may quantize in an amplitude 4 bit (bit) and phase 5 bit manner, which is not particularly limited in this application.
Step 4: and obtaining a short period superposition coefficient. Channel matrix in two polarization directions in step 2And->On the space-frequency joint characteristic substrate after DFT projection quantization reconstructionLine projection to obtain corresponding projection coefficient C 2 The terminal device reports the non-zero coefficient in the projection coefficient, the non-zero coefficient index information and the like to the network device.
Step 5: after the terminal device completes channel measurement, CSI needs to be reported in uplink control information (uplink control information, UCI).
For example, CSI information that the terminal device needs to feed back to the network device includes: long period projection coefficient C of space-frequency joint characteristic base projected in DFT orthogonal basis vector subspace 13 An index number of the selected set of oversampling and the selected DFT basis vector. Projection coefficient C 2 Non-zero coefficient index information, and the like.
Step 6: and the network equipment recovers the downlink channel according to the information fed back by the terminal equipment.
In connection with the above analysis, in the candidate codebook scheme discussed in the R18 CJT standard, the codebook structure of a single station may be expressed asWherein (1)>Is the DFT projection basis vector selected by the space-frequency joint characteristic base B. It can be understood that the space-frequency joint feature base is based on the channel statistical covariance information acquisition of the downlink channel, so that the terminal equipment reports to the network equipment in a long-period reporting mode; and the projection coefficient on the space-frequency combined characteristic substrate is fed back to the network equipment in a short-period reporting mode.
In order to further increase the capacity of the system, the multi-frequency convergence technology has been developed, in which the terminal device supports multiple frequency bands at the same time, and the network device (e.g., a base station) can transmit data to the terminal device through the multiple frequency bands. Because of the difference of the channels in different frequency bands, in the prior art, in order to support the multi-frequency band to send data to the same terminal device, the terminal device needs to separately perform codebook design for different frequency bands and separately report the CSI of each frequency band to the network device. As the number of frequency bands supported by the terminal device becomes more and more, the reporting cost of the terminal device is multiplied, and how to reduce the reporting cost of the terminal device becomes a problem to be solved urgently.
Aiming at the problems, in the implementation process of the existing product, the adjacent frequency bands can adopt a common antenna panel mode, and channels of the two frequency bands have stronger correlation in a space domain; the two frequency bands supported by the terminal device are usually closely spaced, and the two frequency bands have a certain correlation in the frequency domain. Therefore, the embodiment of the application provides a multi-band codebook design method, which can perform joint codebook design and joint reporting on two or more bands, so that the expense of feedback CSI of terminal equipment is reduced. The method proposed in the present application is described in detail below.
Fig. 4 is a schematic flow chart of a method of multi-band codebook design as proposed in the present application. The method comprises the following steps.
S410, the terminal equipment determines a space-frequency joint characteristic public substrate according to a first channel matrix and a second channel matrix, wherein the first channel matrix is a channel matrix of a first frequency band measured by the terminal equipment, the second channel matrix is a channel matrix of a second frequency band measured by the terminal equipment, the first frequency band and the second frequency band are communication frequency bands of the terminal equipment and the network equipment, and the space-frequency joint characteristic public substrate is used for determining the space-frequency joint characteristic substrate of the first frequency band and the space-frequency joint characteristic substrate of the second frequency band.
Optionally, the determining, by the terminal device, the space-frequency joint feature common base according to the first channel matrix and the second channel matrix includes: the terminal equipment determines a first space-frequency joint channel covariance matrix according to the first channel matrix, and determines a second space-frequency joint channel covariance matrix according to the second channel matrix; and the terminal equipment determines a space-frequency joint characteristic public base according to the first space-frequency joint channel covariance matrix and the second space-frequency joint channel covariance matrix.
In the present application, the number of sub-bands corresponding to the first frequency band is B1, the number of sub-bands corresponding to the second frequency band is B2, and the number of antenna ports corresponding to the single polarization direction of the first frequency band (i.e., CSI-RS port number) is N t1 2, the number of antenna ports corresponding to the single polarization direction of the second frequency band is N t2 (2) wherein N t1 With/2 greater than or equal to N t2 And/2, B1 may or may not be equal to B2. The description of determining the space-frequency joint channel covariance matrix corresponding to a frequency band according to the channel matrix corresponding to the frequency band can be referred to in the previous step 2, and will be described in detail later, which will not be described herein.
For the determination manner of the channel matrix and the space-frequency joint channel covariance matrix corresponding to one frequency band, refer to the description in step 2 of the two-stage codebook reporting scheme based on the channel statistical covariance matrix proposed by R18, which is not repeated here.
In one possible implementation manner, the terminal device determines a space-frequency joint characteristic public base according to the first space-frequency joint channel covariance matrix and the second space-frequency joint channel covariance matrix, and specifically comprises the following steps.
S4101, the terminal equipment performs bit summation on the first space-frequency combined channel covariance matrix and the second space-frequency combined channel covariance matrix according to a first rule (also called element bit rule), and performs filtering update on the summed matrix to obtain a space-frequency combined channel statistical covariance matrix.
It should be understood that the summation of two matrices refers to the addition of corresponding elements in the matrices, provided that: the two matrices are to have the same number of rows and columns. Since the rows and columns of the first and second spatial-frequency joint channel covariance matrices may not be identical and cannot be directly added, it is necessary to give element alignment rules so that the terminal device determines how the elements in the two covariance matrices are added. The following illustrates, for different scenarios, the two covariance matrices being summed in alignment according to element alignment rules.
Scene 1: the number N of antenna ports corresponding to a single polarization direction of the first frequency band t1 And/2 is equal to the number N of antenna ports corresponding to the single polarization direction of the second frequency band t2 And/2, the number of sub-bands B1 corresponding to the first frequency band is larger than the number of sub-bands B2 corresponding to the first frequency band.
In this scenario, the element alignment rule indicates information of B2 subbands used to calculate the space-frequency joint channel statistical covariance matrix among B1 subbands of the first frequency band. Then, the terminal device performs bit summation on the first space-frequency joint channel covariance matrix and the second space-frequency joint channel covariance matrix according to the element bit rule, including: n corresponding to each of the B2 sub-bands in the covariance matrix of the second space-frequency joint channel t2 N corresponding to each of the B2 sub-bands indicated by the element alignment rule in the first space-frequency joint channel covariance matrix according to the sequence of the/2 lines t1 And/2 rows are sequentially aligned and added. The following examples are illustrative.
Exemplary, as shown in FIG. 5, N t1 /2＝N t2 2=3, b1=5, b2=3. Wherein, the first space-frequency joint channel covariance matrix R 1 The method comprises the following steps:
wherein H is xy Indicating the channel of subband x in polarization direction y, x indicating the index of subband, y indicating the index of polarization direction, x=1, 2, 3, 4, 5 being the index of subband #11, subband #12, subband #13, subband #14, subband #15, respectively, of the first frequency band, y=1 being the index of one of the two polarization directions, y=2 being the index of the other of the two polarization directions, and H xy All are actions N t1 2, column N Rx Wherein N is Rx Indicating the number of receive antennas of the terminal device. X is HH at the corresponding position H +HH H And, wherein each X is a behavior (N t1 And/2) is set as (N) t1 And/2) a matrix. Then, as shown in fig. 5, the first space-frequency joint channel covariance matrix is the behavior (B1 x N t1 And/2) is (B1 x N) t1 And/2) a matrix. First space-frequency joint channel covariance matrix R 1 Subarray [ X ] 11 X 12 X 13 X 14 X 15 ]The number of lines corresponding to subband #11 (N t1 Row/2), subarray [ X ] 21 X 22 X 23 X 24 X 25 ]The number of lines corresponding to subband #12 (N t1 Row/2), subarray [ X ] 31 X 32 X 33 X 34 X 35 ]The number of lines corresponding to subband #13 (N t1 And/2) row, and will not be described again. Similarly, a second space-frequency joint channel covariance matrix R 2 The method comprises the following steps:
wherein each Y is a behavior (N t2 And/2) is set as (N) t2 Matrix of/2), specific derivation process and R 1 Similarly, the description is omitted here. It should be understood that Y refers to Y 11 To Y 33 Any one of the Y matrices. Then, as shown in fig. 5, the second space-frequency joint channel covariance matrix R 2 Is the behavior (B2. Times.N t2 And/2) is (B2.times.N) t2 And/2) a matrix. Second space-frequency joint channel covariance matrix R 2 [ Y of 11 Y 12 Y 13 ]The number of lines in (a) is the number of lines corresponding to subband #21 (N t2 Row/2), subarray [ Y ] 21 Y 22 Y 23 ]The number of lines corresponding to subband #22 (N t2 Row/2), subarray [ Y ] 31 Y 32 Y 33 ]The number of lines corresponding to subband #23 (N t2 And/2) row, and will not be described again.
It should be understood that, in the present application, the two space-frequency joint channel covariance matrices are all spliced according to the subband dimension, so that when the two matrices are added, addition is also required according to the row corresponding to the subband dimension, that is, the row corresponding to one subband in the first space-frequency joint channel covariance matrix is added to the row corresponding to one subband in the second space-frequency joint channel covariance matrix.
Thereafter, the second space-frequency joint channel covariance matrix is divided into (N t2 Row (2) corresponding to each of the B2 subbands in the B1 subbands indicated by the element alignment rule in the first space-frequency joint channel covariance matrix, respectively (N) t1 (2) adding the rows in turn andand filtering and updating the summed matrix to obtain the space-frequency joint channel statistical covariance matrix.
For example, the B2 sub-band in the B1 sub-band of the first frequency band indicated by the element alignment rule is sub-band #11, sub-band #12, sub-band #13, as shown in fig. 6,and R is R 1 Is->By para-addition, i.e. Y 11 And X is 11 Adding, Y 12 And X is 12 Add, and so on. For another example, if the B2 sub-band in the B1 sub-band of the first frequency band indicated by the element alignment rule is sub-band #11, sub-band #13, sub-band #15, then, as shown in fig. 7,/- >And (3) withAnd performing para-addition.
Scene 2: the number N of antenna ports corresponding to a single polarization direction of the first frequency band t1 2 is greater than the number N of antenna ports corresponding to the single polarization direction of the second frequency band t2 And/2, the number of the sub-bands B1 corresponding to the first frequency band is equal to the number of the sub-bands B2 corresponding to the first frequency band.
In this scenario, the element alignment rule indicates the B2 x B2 behaviors N contained in the second space-frequency joint channel covariance matrix t2 2, column N t2 Each square matrix in the matrix of/2 is added with row information and column information of 0 elements. Then, the terminal device performs bit summation on the first space-frequency joint channel covariance matrix and the second space-frequency joint channel covariance matrix according to the element bit rule, including: determining a fourth space-frequency joint channel covariance matrix, wherein the fourth space-frequency joint channel covariance matrix is B2 x B2N contained in the second covariance matrix t2 /2*N t2 Each of the square matrices of/2 is augmented with row information and column information indicated by element alignment rulesAdding N t1 /2-N t2 Row/2 and N t1 /2-N t2 2 columns of matrix generated after 0 elements; n corresponding to B2 sub-bands in the fourth space-frequency combined channel covariance matrix t1 N corresponding to the B2 sub-bands indicated by the element alignment rule in the first space-frequency combined channel covariance matrix according to the sequence of the/2 rows t1 And/2 rows are sequentially aligned and added.
Exemplary, as shown in FIG. 8, N t1 /2＝4，N t2 2=3, b1=b2=3. Wherein, the first space-frequency joint channel covariance matrix R 1 The method comprises the following steps:
wherein each X is a behavior (N t1 And/2) is set as (N) t1 And/2) a matrix. It should be understood that X refers to X 11 To X 33 Any one of the X matrices. Then, as shown in fig. 8, the first space-frequency joint channel covariance matrix R 1 Is the behavior (B1. Times.N t1 And/2) is (B1 x N) t1 And/2) a matrix. R is R 1 Subarray of matrix [ X ] 11 X 12 X 13 ]The number of lines in (a) is the number of lines corresponding to subband #11 (N t1 Row/2), subarray [ X ] 21 X 22 X 23 ]The number of lines corresponding to subband #12 (N t1 Row/2), subarray [ X ] 31 X 32 X 33 ]The number of lines corresponding to subband #13 (N t1 And/2) rows. Similarly, a second space-frequency joint channel covariance matrix R 2 The method comprises the following steps:
wherein each Y is a behavior (N t2 And/2) is set as (N) t2 The specific derivation of the matrix of/2) is not described here in detail. It should be understood that Y refers to Y 11 To Y 33 Any one of the Y matrices. Then, as shown in fig. 8, the second space-frequency joint channel covariance matrix R 2 Is the behavior (B2. Times.N t2 And/2) is (B2.times.N) t2 And/2) a matrix. The R is 2 Subarray of matrix [ Y ] 11 Y 12 Y 13 ]The number of lines corresponding to subband #21 (N t2 Row/2), subarray [ Y ] 21 Y 22 Y 23 ]The number of lines in (a) is the number of lines corresponding to subband #22 (N t2 Row/2), subarray [ Y ] 31 Y 32 Y 33 ]The number of lines corresponding to subband #23 (N t2 And/2) row is not described in detail.
From the above, the first and second space-frequency joint channel covariance matrices need to be added according to the corresponding rows of the subband dimension, i.e., [ Y ] 11 Y 12 Y 13 ]And [ Y ] 11 Y 12 Y 13 ]Adding, [ Y ] 21 Y 22 Y 23 ]And [ Y ] 21 Y 22 Y 23 ]Adding, [ Y ] 31 Y 32 Y 33 ]And [ X ] 31 X 32 X 33 ]And (5) adding. But since each X is a behavior (N t1 And/2) is set as (N) t1 Matrix of/2), each Y being a behavior (N t2 And/2) is set as (N) t2 The matrix of/2) cannot be added directly.
Therefore, it is necessary to add N in each Y in accordance with row information and column information of 0 elements added as indicated by the element alignment rule before addition t1 /2-N t2 Row 0/2 element and N t1 /2-N t2 Column 0/2, making it a behavior (N t1 And/2) is set as (N) t1 And/2) a matrix. For example, the element alignment rule indicates that N is increased after the second row of each Y t1 /2-N t2 Row 0 element/2 and N is added after the first column t1 /2-N t2 2 columns of 0 elements, and adding 0 elements to the second space-frequency joint channel covariance matrix R 2 As shown in fig. 9. Alternatively, the element alignment rule indicates that N is added after the last row of each Y t1 /2-N t2 Row 0 element/2 and N is incremented after the last column t1 /2-N t2 2 columns of 0 elements, and adding 0 elements to the second space-frequency joint channel covariance matrix R 2 As shown in fig. 10. The application adds row information of 0 element in Y matrix And column information is not limited. Thereafter, each of X and Y is a behavior (N t1 And/2) is set as (N) t1 Matrix of/2), i.e. R 1 And R is R 2 The rows and columns are the same, and the addition is directly carried out, namely Y 11 And X is 11 Adding, Y 12 And X is 12 And adding, analogizing and filtering and updating the summed matrix to obtain the space-frequency joint channel statistical covariance matrix.
Scene 3: the number N of antenna ports corresponding to a single polarization direction of the first frequency band t1 2 is greater than the number N of antenna ports corresponding to the single polarization direction of the second frequency band t2 And/2, the number of sub-bands B1 corresponding to the first frequency band is larger than the number of sub-bands B2 corresponding to the first frequency band.
In this scenario, the element alignment rule indicates information of B2 subbands used for calculating the space-frequency joint channel statistical covariance matrix in B1 subbands of the first frequency band, and B2×b2 behaviors N contained in the second covariance matrix t2 2, column N t2 Each of the square matrices of/2 is added with row information and column information of 0 element. Then, the terminal device performs bit summation on the first space-frequency joint channel covariance matrix and the second space-frequency joint channel covariance matrix according to the element bit rule, including: determining a fourth space-frequency joint channel covariance matrix, which is B2 x B2 behaviors N to be contained in the second covariance matrix t2 2, column N t2 Each of the square matrices of/2 increases by N in accordance with the row information and the column information indicated by the element alignment rule t1 /2-N t2 Row/2 and N t1 /2-N t2 2 columns of matrix generated after 0 elements; n corresponding to B2 sub-bands in the fourth space-frequency combined channel covariance matrix t1 N corresponding to the B2 sub-bands indicated by the element alignment rule in the first space-frequency combined channel covariance matrix according to the sequence of the/2 rows t1 And/2 rows are sequentially aligned and added.
Exemplary, as shown in FIG. 11, N t1 /2＝4，N t2 2=3, b1=3, b2=2. Wherein, the first space-frequency joint channel covariance matrix R 1 The method comprises the following steps:
wherein each X is a behavior (N t1 And/2) is set as (N) t1 The specific derivation of the matrix of/2) is not described here in detail. It should be understood that X refers to X 11 To X 33 Any one of the X matrices. Then, as shown in fig. 11, the first space-frequency joint channel covariance matrix is a behavior (B1 x N t1 And/2) is (B1 x N) t1 And/2) a matrix. Matrix R 1 Subarray [ X ] 11 X 12 X 13 X 14 X 15 ]The number of lines corresponding to subband #11 (N t1 Row/2), subarray [ X ] 21 X 22 X 23 X 24 X 25 ]The number of lines corresponding to subband #12 (N t1 Row/2), subarray [ X ] 31 X 32 X 33 X 34 X 35 ]The number of lines corresponding to subband #13 (N t1 And/2) rows.
Similarly, a second space-frequency joint channel covariance matrix R 2 The method comprises the following steps:
wherein each Y is a behavior (N t2 And/2) is set as (N) t2 The specific derivation of the matrix of/2) is not described here in detail. It should be understood that Y refers to Y 11 To Y 22 Any one of the Y matrices. Then, as shown in fig. 11, the second space-frequency joint channel covariance matrix R 2 For the behavior (B2. Times.N t2 And/2) is (B2.times.N) t2 Matrix of/2), matrix R 2 Subarray [ Y ] 11 Y 12 ]The number of lines corresponding to subband #21 (N t2 Row/2), subarray [ Y ] 21 Y 22 ]The number of lines corresponding to subband #22 (N t2 And/2) rows.
It will be appreciated that the combination of the processing of matrix addition in scenario 1 and scenario 2 may enable matrix addition in scenario 3.
First, as in the processing in scene 2, it is necessary to add N in each Y in accordance with row information and column information of 0 elements added as indicated by the element alignment rule before addition t1 /2-N t2 Row/2 and N t1 /2-N t2 Column 0/2, making it a behavior (N t1 And/2) is set as (N) t1 And/2) a matrix. Thereafter, R is set as in the case of scene 1 2 Each of the B2 subbands in the matrix after the addition of 0 element corresponds to (N t1 Row (2) corresponding to each of the B2 subbands in the B1 subbands indicated by the element alignment rule in the first space-frequency joint channel covariance matrix, respectively (N) t1 And/2) sequentially adding the rows, and filtering and updating the matrix after summation to obtain the space-frequency joint channel statistical covariance matrix. Examples are illustrated.
For example, the element alignment rule indicates that N is added after the last row of each Y t1 /2-N t2 Row 0 element/2 and N is incremented after the last column t1 /2-N t2 Column 0 element/2, further indicating that the B2 sub-band in the B1 sub-band of the first frequency band is sub-band #11 and sub-band #13, and then R is determined according to the element alignment rule 2 The matrix after adding 0 elements is shown in fig. 12, and then the matrix shown in fig. 12 is correlated with each of the B2 subbands in the B1 subbands in the first space-frequency joint channel covariance matrix (N t1 And/2) sequentially adding the rows, wherein the adding schematic diagram is shown in fig. 13.
Scene 4: the number N of antenna ports corresponding to a single polarization direction of the first frequency band t1 And/2 is equal to the number N of antenna ports corresponding to the single polarization direction of the second frequency band t2 And/2, the number of the sub-bands B1 corresponding to the first frequency band is equal to the number of the sub-bands B2 corresponding to the first frequency band.
Since the antenna ports and the subband numbers of the first frequency band and the second frequency band are the same, the first space-frequency combined channel covariance matrix and the second space-frequency combined channel covariance matrix are the matrices with the same row and column, and therefore, the two covariance matrices can be directly added. Similarly, the first space-frequency joint channel covariance matrix and the second space-frequency joint channel covariance matrix need to be added according to the corresponding rows of the subband dimension.
Optionally, each of the B2 subbands in the second space-frequency joint channel covariance matrix corresponds to N respectively t2 N of each of the B1 sub-bands in the first space-frequency combined channel covariance matrix is respectively corresponding to the 2 rows according to the sequence t1 And (2) sequentially aligning and adding the rows, and filtering and updating the matrix after summation to obtain the space-frequency joint channel statistical covariance matrix.
Optionally, each of the B2 subbands in the second space-frequency joint channel covariance matrix corresponds to N respectively t2 N of each of the B1 sub-bands in the first space-frequency combined channel covariance matrix is respectively corresponding to the 2 rows according to the sequence t1 And (2) sequentially aligning and adding the rows, dividing the summed matrix by 2, and then carrying out filtering update to obtain the space-frequency joint channel statistical covariance matrix.
It should be understood that the space-frequency joint channel statistical covariance matrix obtained by the terminal device in the present application is a behavior (B1 x N) t1 And/2) is (B1 x N) t1 And/2) a matrix.
S4102, the terminal equipment carries out singular value decomposition on the space-frequency joint channel statistical covariance matrix to obtain a singular matrix, and selects the front L columns of the singular matrix as a space-frequency joint characteristic public base.
Alternatively, L may be a preset value, or may be configured by a network device, which is not limited in this application. It should be appreciated that the first L columns of the singular matrix correspond to the columns of the singular matrix corresponding to the first L values with larger singular values.
It should be understood that the range of values of L in scenes 1, 4 is 1.ltoreq.L.ltoreq.B2.times.N t2 2, L in scenes 2 and 3 has a value range of 1.ltoreq.L.ltoreq.B2.times.N t1 /2. That is, the value of L cannot exceed the number of matrix columns actually added in the two covariance matrices.
It should also be appreciated that the space-frequency joint characteristic common base in the embodiments of the present application is a behavior (B1 x N t1 And/2) a matrix of columns L. Illustratively, the added matrix in fig. 6 is subjected to filtering update to obtain a space-frequency joint channel statistics covariance matrix, and as shown in fig. 14, space-frequency joint channel statistics are interceptedThe first l=6 columns of the covariance matrix serve as the common basis for the spatial-frequency joint features.
S420, the terminal equipment sends information for indicating the space-frequency joint characteristic public base to the network equipment. Correspondingly, the network equipment receives information from the terminal equipment, wherein the information is used for indicating the space-frequency joint characteristic public base.
It should be understood that the network device recovers the spatial-frequency joint feature common base according to the information of the spatial-frequency joint feature common base. The recovery process is the same as the current R18 standard proposes a two-stage codebook reporting scheme based on a channel statistical covariance matrix to recover the downlink channel, and is not described here.
Optionally, the information for indicating the spatial-frequency joint characteristic common base includes: index numbers of discrete Fourier transform basis vectors corresponding to the oversampling groups of the selected oversampling groups, and projection coefficients of the space-frequency joint characteristic public base on the discrete Fourier transform basis vectors. It should be understood that, the feedback of the above information to the network device by the terminal device through the long-period reporting manner or the short-period reporting manner may refer to the description in the prior art, which is not repeated herein.
And S430, the network equipment determines the space-frequency joint characteristic base of the first frequency band and the space-frequency joint characteristic base of the second frequency band according to the information of the space-frequency joint characteristic public base.
The network equipment firstly restores the space-frequency joint characteristic public base based on the information for indicating the space-frequency joint characteristic public base, and then the network equipment determines the space-frequency joint characteristic public base as a space-frequency joint characteristic base of a first frequency band; and the network equipment processes the space-frequency joint characteristic public base according to the element alignment rule (namely element selection) to determine the space-frequency joint characteristic base of the second frequency band.
The following illustrates, for different scenarios, how to perform element selection on the spatial-frequency joint feature common base to determine the spatial-frequency joint feature base of the second frequency band.
Scene 1: the number N of antenna ports corresponding to a single polarization direction of the first frequency band t1 And/2 is equal to the number N of antenna ports corresponding to the single polarization direction of the second frequency band t2 /2，The number of sub-bands B1 corresponding to the first frequency band is greater than the number of sub-bands B2 corresponding to the first frequency band.
In this scenario, the element alignment rule indicates information of B2 subbands used to calculate the space-frequency joint channel statistical covariance matrix among B1 subbands of the first frequency band. Then, the network device performs element selection on the spatial-frequency joint feature public base according to the element alignment rule to determine a spatial-frequency joint feature base of the second frequency band, including: B2×N of common base of space-frequency joint characteristic t2 Line/2 is determined as the space-frequency joint characteristic base of the second frequency band, wherein B2 is N t2 N corresponding to each sub-band in B2 sub-bands indicated by the alignment rule of the/2 behavior element t1 And/2 rows are corresponding to rows in the space-frequency joint channel statistical covariance matrix. That is, in this scenario, if bandwidths corresponding to the two frequency bands are different, the feature base of the frequency band with the smaller number of sub-bands (i.e., the second frequency band) may be obtained by cutting off the feature base of the frequency band with the larger number of sub-bands (i.e., the first frequency band) (i.e., the public base).
As shown in fig. 14, the network device determines N corresponding to each of the subband #11, subband #13, and subband #15, because the network device receives the spatial-frequency joint feature common base shown in fig. 14, and the B2 subbands indicated by the element alignment rule corresponding to the spatial-frequency joint feature common base are each the subband #11, subband #13, and subband #15 in the first frequency band t1 And (2) taking the element of the corresponding row in the space-frequency combined channel statistical covariance matrix as a space-frequency combined characteristic base of the second frequency band.
Scene 2: the number N of antenna ports corresponding to a single polarization direction of the first frequency band t1 2 is greater than the number N of antenna ports corresponding to the single polarization direction of the second frequency band t2 And/2, the number of the sub-bands B1 corresponding to the first frequency band is equal to the number of the sub-bands B2 corresponding to the first frequency band.
In this scenario, the element alignment rule indicates B2 x B2 behaviors N contained in the second covariance matrix t2 2, column N t2 Each matrix in the square matrix of/2 is added with row information and column information of 0 elements. Then, the network equipment performs element selection on the spatial frequency joint characteristic public base according to the element alignment ruleTo determine a space-frequency joint feature base for a second frequency band, comprising: B2×N in space-frequency joint characteristic public base t2 Extracting elements in row/2, B2.times.N t2 N corresponding to B2 sub-bands in third space-frequency combined channel covariance matrix t2 The row/2 corresponds to the row in the space-frequency combined channel statistical covariance matrix, wherein the third space-frequency combined channel covariance matrix is B2 x B2 rows N contained in the second covariance matrix t2 2, column N t2 The square matrix of/2 increases N according to the row information and column information indicated by the element alignment rule t1 /2-N t2 Row/2 and N t1 /2-N t2 Matrix generated after 0 elements are listed in 2 columns, and N is respectively corresponding to each sub-band in the B2 sub-bands t2 Row/2 does not include N for each of the B2 subbands t1 Row of 0 element added in row/2; and splicing the extracted elements to obtain a space-frequency joint characteristic substrate of the second frequency band.
Illustratively, in the second covariance matrix shown in fig. 8, B2 x B2 behaviors N t2 2, column N t2 The square matrix of/2 is Y 11 To Y 33 The 9 subarrays. It should be understood that in this scenario, in the case that the number of antenna ports is different for each frequency band, the space-frequency joint feature base can include information of each subband, and it is not preferable to directly truncate the space-frequency joint feature base (i.e., the common base) of the first frequency band to obtain the space-frequency joint feature base of the second frequency band, so that information of a part of subbands of the second frequency band may be lost. Therefore, in order to better design the space-frequency joint feature substrate of the second frequency band, the space-frequency joint feature substrate of the first frequency band needs to be extracted according to the number of antenna ports corresponding to the single polarization direction of the second frequency band, so that the space-frequency joint feature substrate of the second frequency band obtained by extraction can be ensured to contain information of each sub-band.
Illustratively, the network device receives the space-frequency joint characteristic common base shown in fig. 15, which is the matrix of fig. 10 (i.e., N is incremented after the last row of each Y matrix of the second space-frequency joint channel covariance matrix shown in fig. 8) t1 /2-N t2 Row 0 element/2 and N is incremented after the last column t1 /2-N t2 Matrix obtained by 2 columns of 0 elements) and the first space-frequency joint channel covariance matrix in fig. 8, and then filtering and updating, and obtaining a matrix obtained by intercepting the space-frequency joint channel statistical covariance matrix by l=6 columns. Therefore, the network device splices the rows except the row corresponding to the element 0 in fig. 15, so as to obtain the space-frequency joint characteristic substrate of the second frequency band.
Scene 3: the number N of antenna ports corresponding to a single polarization direction of the first frequency band t1 2 is greater than the number N of antenna ports corresponding to the single polarization direction of the second frequency band t2 And/2, the number of sub-bands B1 corresponding to the first frequency band is larger than the number of sub-bands B2 corresponding to the first frequency band.
In this scenario, the element alignment rule indicates information of B2 subbands used for calculating the space-frequency joint channel statistical covariance matrix in B1 subbands of the first frequency band, and B2×b2 behaviors N contained in the second covariance matrix t2 2, column N t2 Each of the square matrices of/2 is added with row information and column information of 0 element. Then, the network device performs element selection on the spatial-frequency joint feature public base according to the element alignment rule to determine a spatial-frequency joint feature base of the second frequency band, including: B2×N of common base of space-frequency joint characteristic t1 Line/2 is defined as a first space-frequency joint feature base, wherein, B2 is N t2 N corresponding to B2 sub-bands in fourth space-frequency combined channel covariance matrix t1 The row/2 corresponds to the row in the space-frequency combined channel statistical covariance matrix, and the fourth space-frequency combined channel covariance matrix is B2 x B2 rows N contained in the second space-frequency combined channel covariance matrix t2 2, column N t2 Each of the square matrices of/2 increases by N in accordance with the row information and the column information indicated by the element alignment rule t1 /2-N t2 Row/2 and N t1 /2-N t2 2 columns of matrix generated after 0 elements; for B2.times.N in the first space-frequency joint characteristic substrate t2 Extracting elements in row/2, B2.times.N t2 N corresponding to each of the B2 sub-bands in the fourth space-frequency joint channel covariance matrix t2 Row/2 corresponding to row in space-frequency combined channel statistical covariance matrix, B2Each of the sub-bands corresponds to N t2 Row/2 does not include N for each of the B2 subbands t1 Row of 0 element added in row/2; and splicing the extracted elements to obtain a space-frequency joint characteristic substrate of the second frequency band.
For example, the added matrix in fig. 13 is filtered and updated to obtain a space-frequency joint channel statistical covariance matrix, and the previous l=6 columns are intercepted to be used as a space-frequency joint feature public base, and the network device receives the space-frequency joint feature public base shown in fig. 16. From the above, the B2 subbands indicated by the element alignment rule corresponding to the space-frequency joint characteristic common base are subband #11 and subband #13 in the first frequency band, respectively, so the network device determines N corresponding to subband #11 and subband #13 in the space-frequency joint channel statistical covariance matrix respectively t1 The element of the row/2 is the space-frequency joint characteristic base of the second frequency band, wherein each sub-band in the B2 sub-bands corresponds to N respectively t2 Row/2 does not include N for each of the B2 subbands t1 Row of 0 elements added in row/2.
Scene 4: the number N of antenna ports corresponding to a single polarization direction of the first frequency band t1 And/2 is equal to the number N of antenna ports corresponding to the single polarization direction of the second frequency band t2 And/2, the number of the sub-bands B1 corresponding to the first frequency band is equal to the number of the sub-bands B2 corresponding to the first frequency band.
It should be understood that, since the antenna ports and the number of subbands of the first frequency band and the second frequency band are the same, the first space-frequency joint channel covariance matrix and the second space-frequency joint channel covariance matrix are the same in both rows and columns, and thus, the network device determines the space-frequency joint feature common base as the space-frequency joint feature base of the second frequency band.
It should be understood that when the number N of antenna ports corresponding to a single polarization direction of the first frequency band t1 2 is greater than the number N of antenna ports corresponding to the single polarization direction of the second frequency band t2 And/2, when the number of sub-bands B1 corresponding to the first frequency band is smaller than the number of sub-bands B2 corresponding to the second frequency band, adding the first space-frequency combined channel covariance matrix and the second space-frequency combined channel covariance matrix to obtain a space-frequency combined channel statistical covariance matrix, and adding the space-frequency combined channel statistical covariance matrix to scene 3 in S410 Is substantially similar, in particular, before adding the two space-frequency joint channel covariance matrices, B2 x B2 actions (N t2 And/2) is set as (N) t2 Each of the matrices of/2) is added with 0 element to make it a behavior (N) t1 And/2) is set as (N) t1 Matrix of/2), then N corresponding to B1 sub-bands of the first space-frequency joint channel covariance matrix t1 N corresponding to B1 sub-bands in B2 sub-bands of the second space frequency combined channel covariance matrix after 0 element is added in row/2 t1 And adding the rows/2 in sequence, and filtering and updating the matrix after summation to obtain the space-frequency joint channel statistical covariance matrix. Wherein, information of B1 sub-bands used for calculating the space-frequency combined channel statistical covariance matrix in B2 sub-bands of the second frequency band, and B2 x B2 behaviors N contained in the second covariance matrix t2 2, column N t2 The row information and the column information added with 0 element in each matrix in the square matrix of/2 are indicated by element alignment rules. And then, the terminal equipment carries out singular value decomposition on the space-frequency combined channel statistical covariance matrix to obtain a singular matrix, selects the front L columns of the singular matrix as a space-frequency combined characteristic public base, and sends the space-frequency combined characteristic public base to the network equipment. The process of acquiring the space-frequency joint feature substrate of the second frequency band by the network device under the scene through the space-frequency joint feature public substrate is basically similar to the description in the scene 3 in the S430, specifically, the network device intercepts the corresponding row of the B1 sub-band of the first frequency band in the space-frequency joint feature public substrate, and then splices the rows except the row corresponding to the element 0 in the intercepted rows, so that the space-frequency joint feature substrate of the second frequency band can be obtained.
It should also be understood that the element alignment rule may be preset, or may be configured by the network device for the terminal device, which is not specifically limited in this application.
It should also be appreciated that the element alignment rules in this application may also be referred to as covariance matrix addition rules or other names, which are not limited in this application.
It should also be understood that the space-frequency joint feature common substrate in the present application may also be referred to by other names, which are not limited in this application.
The technical scheme provides a specific method for the terminal equipment to carry out joint characteristic base design on two frequency bands under different scenes, so that the terminal equipment only needs to feed back one space-frequency joint characteristic public base to the network equipment aiming at the two frequency bands, thereby reducing the expense of the terminal equipment for feeding back the CSI.
It should be further understood that the sequence numbers of the above processes do not mean the order of execution, and the order of execution of the processes should be determined by the functions and the internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.
It is also to be understood that in the various embodiments of the application, terms and/or descriptions of the various embodiments are consistent and may be referenced to one another in the absence of a particular explanation or logic conflict, and that the features of the various embodiments may be combined to form new embodiments in accordance with their inherent logic relationships.
It should also be understood that in some of the above embodiments, the devices in the existing network architecture are mainly exemplified, and it should be understood that the embodiments of the present application are not limited to specific forms of the devices. For example, devices that can achieve the same functionality in the future are suitable for use in the embodiments of the present application.
It will be appreciated that in the various method embodiments described above, the methods and operations implemented by a device (e.g., a terminal device, a network device, etc.) may also be implemented by a component (e.g., a chip or circuit) of the device.
The method provided in the embodiment of the present application is described in detail above with reference to fig. 1 to 16. The above method is mainly described in terms of interaction between the terminal device and the network device. It will be appreciated that the terminal device and the network device, in order to implement the above-mentioned functions, comprise corresponding hardware structures and/or software modules for performing the respective functions.
Those of skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as hardware or combinations of hardware and computer software. Whether a function is implemented as hardware or computer software driven hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The following describes in detail the communication device provided in the embodiment of the present application with reference to fig. 17 and 18. It should be understood that the descriptions of the apparatus embodiments and the descriptions of the method embodiments correspond to each other, and thus, descriptions of details not shown may be referred to the above method embodiments, and for the sake of brevity, some parts of the descriptions are omitted. The embodiment of the application may divide the functional modules of the terminal device or the network device according to the above method example, for example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The integrated modules may be implemented in hardware or in software functional modules. It should be noted that, in the embodiment of the present application, the division of the modules is schematic, which is merely a logic function division, and other division manners may be implemented in actual implementation. The following description will take an example of dividing each functional module into corresponding functions.
The method for transmitting data provided by the application is described in detail above, and the communication device provided by the application is described below. In a possible implementation manner, the apparatus is configured to implement steps or procedures corresponding to the network device in the above method embodiment. In another possible implementation manner, the apparatus is configured to implement steps or procedures corresponding to the terminal device in the foregoing method embodiment.
Fig. 17 is a schematic block diagram of a communication apparatus 200 provided in an embodiment of the present application. As shown in fig. 17, the apparatus 200 may include a communication unit 210 and a processing unit 220. The communication unit 210 may communicate with the outside, and the processing unit 220 is used for data processing. The communication unit 210 may also be referred to as a communication interface or transceiver unit.
In a possible design, the apparatus 200 may implement steps or procedures performed by a terminal device corresponding to the above method embodiments, where the processing unit 220 is configured to perform operations related to processing by the terminal device in the above method embodiments, and the communication unit 210 is configured to perform operations related to sending by the terminal device in the above method embodiments.
In yet another possible design, the apparatus 200 may implement steps or flows performed by a network device corresponding to the above method embodiments, where the communication unit 210 is configured to perform operations related to the reception by the network device in the above method embodiments, and the processing unit 220 is configured to perform operations related to the processing by the network device in the above method embodiments.
It should be understood that the apparatus 200 herein is embodied in the form of functional units. The term "unit" herein may refer to an application specific integrated circuit (application specific integrated circuit, ASIC), an electronic circuit, a processor (e.g., a shared, dedicated, or group processor, etc.) and memory that execute one or more software or firmware programs, a combinational logic circuit, and/or other suitable components that support the described functionality. In an alternative example, it will be understood by those skilled in the art that the apparatus 200 may be specifically configured to be a terminal device in the foregoing embodiment, and may be used to perform each flow and/or step corresponding to the terminal device in the foregoing method embodiment, or the apparatus 200 may be specifically configured to be a network device in the foregoing embodiment, and may be used to perform each flow and/or step corresponding to the network device in the foregoing method embodiment, which is not repeated herein.
The apparatus 200 of each of the above aspects has a function of implementing the corresponding step performed by the terminal device in the above method, or the apparatus 200 of each of the above aspects has a function of implementing the corresponding step performed by the network device in the above method. The functions may be implemented by hardware, or may be implemented by hardware executing corresponding software. The hardware or software comprises one or more modules corresponding to the functions; for example, the communication units may be replaced by transceivers (e.g., a transmitting unit in the communication units may be replaced by a transmitter, a receiving unit in the communication units may be replaced by a receiver), and other units, such as processing units, etc., may be replaced by processors, to perform the transceiving operations and related processing operations, respectively, in the various method embodiments.
The communication unit may be a transceiver circuit (e.g., may include a receiving circuit and a transmitting circuit), and the processing unit may be a processing circuit. In the embodiment of the present application, the apparatus in fig. 17 may be an AP or STA in the foregoing embodiment, or may be a chip or a chip system, for example: system on chip (SoC). The communication unit can be an input/output circuit and a communication interface; the processing unit is an integrated processor or microprocessor or integrated circuit on the chip. And are not limited herein.
Fig. 18 is a schematic block diagram of a communication device 300 provided in an embodiment of the present application. The apparatus 300 includes a processor 310 and a transceiver 320. Wherein the processor 310 and the transceiver 320 communicate with each other through an internal connection path, the processor 310 is configured to execute instructions to control the transceiver 320 to transmit signals and/or receive signals.
Optionally, the apparatus 300 may further include a memory 330, where the memory 330 is in communication with the processor 310 and the transceiver 320 via an internal connection path. The memory 330 is used to store instructions and the processor 310 may execute the instructions stored in the memory 330. In a possible implementation manner, the apparatus 300 is configured to implement each flow and step corresponding to the terminal device in the above method embodiment. In another possible implementation manner, the apparatus 300 is configured to implement the respective flows and steps corresponding to the network device in the above method embodiment.
It should be understood that the apparatus 300 may be specifically a terminal device or a network device in the foregoing embodiment, and may also be a chip or a chip system. Correspondingly, the transceiver 320 may be a transceiver circuit of the chip, which is not limited herein. Specifically, the apparatus 300 may be configured to perform each step and/or flow corresponding to the terminal device or the network device in the above method embodiments. Alternatively, the memory 330 may include read-only memory and random access memory and provide instructions and data to the processor. A portion of the memory may also include non-volatile random access memory. For example, the memory may also store information of the device type. The processor 310 may be configured to execute instructions stored in a memory, and when the processor 310 executes instructions stored in the memory, the processor 310 is configured to perform the steps and/or processes of the method embodiments described above corresponding to a terminal device or network device.
In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in a processor or by instructions in the form of software. The steps of a method disclosed in connection with the embodiments of the present application may be embodied directly in a hardware processor for execution, or in a combination of hardware and software modules in the processor for execution. The software modules may be located in a random access memory, flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, etc. as well known in the art. The storage medium is located in a memory, and the processor reads the information in the memory and, in combination with its hardware, performs the steps of the above method. To avoid repetition, a detailed description is not provided herein.
It should be noted that the processor in the embodiments of the present application may be an integrated circuit chip with signal processing capability. In implementation, the steps of the above method embodiments may be implemented by integrated logic circuits of hardware in a processor or instructions in software form. The processor may be a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic, or discrete hardware components. The processor in the embodiments of the present application may implement or execute the methods, steps and logic blocks disclosed in the embodiments of the present application. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present application may be embodied directly in hardware, in a decoded processor, or in a combination of hardware and software modules in a decoded processor. The software modules may be located in a random access memory, flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, etc. as well known in the art. The storage medium is located in a memory, and the processor reads the information in the memory and, in combination with its hardware, performs the steps of the above method.
It will be appreciated that the memory in embodiments of the present application may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The nonvolatile memory may be a read-only memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an electrically Erasable EPROM (EEPROM), or a flash memory. The volatile memory may be random access memory (random access memory, RAM) which acts as an external cache. By way of example, and not limitation, many forms of RAM are available, such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous DRAM (SLDRAM), and direct memory bus RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to comprise, without being limited to, these and any other suitable types of memory
It should be noted that when the processor is a general purpose processor, DSP, ASIC, FPGA or other programmable logic device, discrete gate or transistor logic device, discrete hardware components, the memory (storage module) may be integrated into the processor.
Furthermore, the present application also provides a computer readable storage medium, where computer instructions are stored, when the computer instructions run on a computer, to cause operations and/or flows performed by a terminal device or a network device in the method embodiments of the present application to be performed.
The present application also provides a computer program product comprising computer program code or instructions which, when run on a computer, cause operations and/or flows performed by a terminal device or network device in the method embodiments of the present application to be performed.
In addition, the application also provides a chip, wherein the chip comprises a processor. The memory for storing the computer program is provided separately from the chip and the processor is configured to execute the computer program stored in the memory such that the operations and/or processes performed by the terminal device or the network device in any one of the method embodiments are performed.
Further, the chip may also include a communication interface. The communication interface may be an input/output interface, an interface circuit, or the like. Further, the chip may further include a memory.
In addition, the application also provides a communication system which comprises the terminal equipment and the network equipment in the embodiment of the application.
It should also be noted that the memory described herein is intended to comprise, without being limited to, these and any other suitable types of memory.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application. It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, and are not repeated herein. In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form. The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment. In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a usb disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk, etc.
It should be appreciated that reference throughout this specification to "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, various embodiments are not necessarily referring to the same embodiments throughout the specification. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
It should be further understood that reference to "first," "second," etc. ordinal words of the embodiments herein are used for distinguishing between multiple objects, and are not used for limiting the size, content, order, timing, priority, importance, etc. of the multiple objects. For example, the first information and the second information do not represent differences in information amount size, content, priority, importance, or the like.
It should also be understood that, in this application, "when …", "if" and "if" all refer to a corresponding process that the network element will make under some objective condition, are not limited in time, nor do it require that the network element be implemented with a judging action, nor are other limitations meant to be present.
It should also be understood that in this application, "at least one" means one or more, and "a plurality" means two or more. "at least one item" or the like means one item or more, i.e., any combination of these items, including any combination of single item or plural items. For example, at least one (one) of a, b, or c, represents: a, b, c, a and b, a and c, b and c, or a and b and c.
It is also to be understood that items appearing in this application that are similar to "include one or more of the following: the meaning of the expressions a, B, and C "generally means that the item may be any one of the following unless otherwise specified: a, A is as follows; b, a step of preparing a composite material; c, performing operation; a and B; a and C; b and C; a, B and C; a and A; a, A and A; a, A and B; a, a and C, a, B and B; a, C and C; b and B, B and C, C and C; c, C and C, and other combinations of a, B and C. The above is an optional entry for the item exemplified by 3 elements a, B and C, when expressed as "the item includes at least one of the following: a, B, … …, and X ", i.e. when there are more elements in the expression, then the entry to which the item is applicable can also be obtained according to the rules described above.
It should also be understood that the term "and/or" is merely one association relationship describing the associated object, and means that three relationships may exist, for example, a and/or B may mean: a alone, a and B together, and B alone, wherein a, B may be singular or plural. The character "/" generally indicates that the context-dependent object is an "or" relationship. For example, A/B, means: a or B.
It should also be understood that in various embodiments of the present application, "B corresponding to a" means that B is associated with a from which B may be determined. It should also be understood that determining B from a does not mean determining B from a alone, but may also determine B from a and/or other information.
The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes and substitutions are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (44)
1. A method of multi-band codebook design, comprising:
the method comprises the steps that a terminal device determines a space-frequency joint characteristic public base according to a first channel matrix and a second channel matrix, wherein the first channel matrix is a channel matrix of a first frequency band measured by the terminal device, the second channel matrix is a channel matrix of a second frequency band measured by the terminal device, the first frequency band and the second frequency band are communication frequency bands of the terminal device and network devices, and the space-frequency joint characteristic public base is used for determining the space-frequency joint characteristic base of the first frequency band and the space-frequency joint characteristic base of the second frequency band;
And the terminal equipment sends information for indicating the space-frequency joint characteristic public base to the network equipment.
2. The method of claim 1, wherein the terminal device determining the spatial-frequency joint characteristic common base from the first channel matrix and the second channel matrix comprises:
the terminal equipment determines a first space-frequency joint channel covariance matrix according to the first channel matrix, and determines a second space-frequency joint channel covariance matrix according to the second channel matrix;
and the terminal equipment determines the space-frequency joint characteristic public base according to the first space-frequency joint channel covariance matrix and the second space-frequency joint channel covariance matrix.
3. The method of claim 2, wherein the number N of antenna ports corresponding to a single polarization direction of the first frequency band t1 And/2 is greater than or equal to the number N of antenna ports corresponding to the single polarization direction of the second frequency band t2 2, and the number of sub-bands B1 corresponding to the first frequency band is larger than or equal to the number of sub-bands B2 corresponding to the second frequency band;
the terminal equipment determines the space-frequency joint characteristic public base according to the first space-frequency joint channel covariance matrix and the second space-frequency joint channel covariance matrix, and comprises the following steps:
The terminal equipment performs bit summation on the first space-frequency joint channel covariance matrix and the second space-frequency joint channel covariance matrix according to a first rule, and determines a space-frequency joint channel statistical covariance matrix according to the summed matrix;
the terminal equipment determines a singular matrix according to the space-frequency joint channel statistical covariance matrix, and selects the front L columns of the singular matrix as the space-frequency joint characteristic public base, wherein L is smaller than or equal to B1N t1 2 and B2 x N t2 Smaller value in/2.
4. A method according to claim 3, wherein N t1 2 is equal to N t2 Wherein/2, B1 is greater than B2, the first rule indicates information of B2 sub-bands used for calculating the space-frequency joint channel statistical covariance matrix in the B1 sub-bands of the first frequency band,
the terminal device performs bit summation on the first space-frequency joint channel covariance matrix and the second space-frequency joint channel covariance matrix according to a first rule, and the bit summation comprises the following steps:
n corresponding to each of the B2 sub-bands in the second space-frequency joint channel covariance matrix t2 The/2 rows are respectively corresponding to N sub-bands in the B2 sub-bands of the first frequency band indicated by the first rule in the first space-frequency joint channel covariance matrix according to the sequence t1 And/2 rows are sequentially aligned and added.
5. A method according to claim 3, wherein N t1 With/2 greater than N t2 2, and B1 is equal to B2, the first rule indicating B2 x B2N contained in the second covariance matrix t2 /2*N t2 Each square matrix of the square matrix of/2 is added with row information and column information of 0 element,
the terminal device performs bit summation on the first space-frequency joint channel covariance matrix and the second space-frequency joint channel covariance matrix according to a first rule, and the bit summation comprises the following steps:
determining a third space-frequency joint channel covariance matrix, wherein the third space-frequency joint channel covariance matrix is B2 x B2 behaviors N contained in the second covariance matrix t2 2, column N t2 Each of the/2 square arrays increases N according to the row information and the column information indicated by the first rule t1 /2-N t2 Row/2 and N t1 /2-N t2 2 columns of matrix generated after 0 elements;
n corresponding to each of the B2 sub-bands in the third space-frequency joint channel covariance matrix t1 N lines/2 are respectively corresponding to each sub-band in the B1 sub-bands in the first space-frequency combined channel covariance matrix according to the sequence t1 And/2 rows are sequentially aligned and added.
6. A method according to claim 3, wherein N t1 With/2 greater than N t2 2, and B1 is greater than B2, the first rule indicating information of B2 subbands used for calculating the space-frequency joint channel statistical covariance matrix among B1 subbands of the first frequency band, and B2 x B2N contained in the second covariance matrix t2 /2*N t2 Each square matrix of the square matrix of/2 is added with row information and column information of 0 element,
the terminal device performs bit summation on the first space-frequency joint channel covariance matrix and the second space-frequency joint channel covariance matrix according to a first rule, and the bit summation comprises the following steps:
determining a fourth space-frequency combined channel covariance matrix, wherein the fourth space-frequency combined channel covariance matrix is formed by B2 x B2 behaviors N contained in the second covariance matrix t2 2, column N t2 Each of the square matrices of/2 increases by N in accordance with the row information and the column information indicated by the first rule t1 /2-N t2 Row/2 and N t1 /2-N t2 2 columns of matrix generated after 0 elements;
n corresponding to each of the B2 sub-bands in the fourth space-frequency joint channel covariance matrix t1 The/2 rows are respectively corresponding to N sub-bands in the B2 sub-bands of the first frequency band indicated by the first rule in the first space-frequency joint channel covariance matrix according to the sequence t1 And/2 rows are sequentially aligned and added.
7. A method according to claim 3, wherein N t1 2 is equal to N t2 And/2, and B1 is equal to B2,
the terminal device performs bit summation on the first space-frequency joint channel covariance matrix and the second space-frequency joint channel covariance matrix according to a first rule, and the bit summation comprises the following steps:
n corresponding to each of the B2 sub-bands in the second space-frequency joint channel covariance matrix t1 N lines/2 are respectively corresponding to each sub-band in the B1 sub-bands in the first space-frequency combined channel covariance matrix according to the sequence t2 And/2 rows are sequentially aligned and added.
8. The method according to any one of claims 3-7, further comprising:
the terminal equipment receives first indication information sent by the network equipment, wherein the first indication information comprises the first rule, and the first indication information is used for indicating the terminal equipment to carry out bit summation on the first space-frequency joint channel covariance matrix and the second space-frequency joint channel covariance matrix according to the first rule.
9. The method according to any one of claims 3-7, further comprising:
The terminal equipment sends second indication information to the network equipment, wherein the second indication information comprises the first rule, and the second indication information indicates the network equipment to process the space-frequency joint characteristic public base according to the first rule so as to obtain the space-frequency joint characteristic base of the second frequency band.
10. The method according to any of claims 1-9, wherein the information indicating the spatial-frequency joint characteristic common base comprises: and the selected oversampling group is provided with an index number of a Discrete Fourier Transform (DFT) base vector corresponding to the oversampling group and a projection coefficient of the space-frequency joint characteristic public base on the DFT base vector.
11. A method of multi-band codebook design, comprising:
the method comprises the steps that network equipment receives information used for indicating a space-frequency joint characteristic public base from terminal equipment, wherein the space-frequency joint characteristic public base is determined by the terminal equipment according to a first channel matrix and a second channel matrix, the first channel matrix is a channel matrix of a first frequency band measured by the terminal equipment, the second channel matrix is a channel matrix of a second frequency band measured by the terminal equipment, and the first frequency band and the second frequency band are communication frequency bands of the network equipment and the terminal equipment;
And the network equipment determines the space-frequency joint characteristic base of the first frequency band and the space-frequency joint characteristic base of the second frequency band according to the information of the space-frequency joint characteristic public base.
12. The method of claim 11 wherein the spatial-frequency joint characteristic common base is determined from a first spatial-frequency joint channel covariance matrix determined from the first channel matrix and a second spatial-frequency joint channel covariance matrix determined from the second spatial-frequency joint channel covariance matrix.
13. The method of claim 12, wherein the number N of antenna ports corresponding to a single polarization direction of the first frequency band t1 And/2 is greater than or equal to the number N of antenna ports corresponding to the single polarization direction of the second frequency band t2 And/2, and the number of sub-bands B1 corresponding to the first frequency band is greater than or equal to the number of sub-bands B2 corresponding to the second frequency band,
the space-frequency joint characteristic common base is formed by the front L columns of a singular matrix, the singular matrix is determined according to a space-frequency joint channel statistical covariance matrix, the space-frequency joint channel statistical covariance matrix is obtained by carrying out bit summation on the first space-frequency joint channel covariance matrix and the second space-frequency joint channel covariance matrix according to a first rule, wherein L is smaller than or equal to B1N t1 2 and B2 x N t2 A smaller value in/2;
the network device determines a space-frequency joint feature substrate of the first frequency band and a space-frequency joint feature substrate of the second frequency band according to the space-frequency joint feature public substrate, and comprises:
the network equipment determines the space-frequency joint characteristic public substrate as the space-frequency joint characteristic substrate of the first frequency band;
and the network equipment performs element selection on the space-frequency joint characteristic public base according to the first rule to determine the space-frequency joint characteristic base of the second frequency band.
14. According to claim 13The method is characterized in that N t1 2 is equal to N t2 Wherein/2, B1 is greater than B2, the first rule indicates information of B2 sub-bands used for calculating the space-frequency joint channel statistical covariance matrix in the B1 sub-bands of the first frequency band,
the network device performs element selection on the space-frequency joint feature public base according to the first rule to determine a space-frequency joint feature base of the second frequency band, including:
B2×N of the space-frequency joint characteristic public base t2 Line/2 is determined as a space-frequency joint characteristic base of the second frequency band, wherein the B2 is N t2 2, respectively corresponding N of each of the B2 sub-bands of the first frequency band indicated by the first rule in the space-frequency joint channel statistical covariance matrix t1 Row/2.
15. The method of claim 13, wherein N t1 With/2 greater than N t2 2, and B1 is equal to B2, the first rule indicating B2 x B2 behaviors N contained in the second covariance matrix t2 2, column N t2 Each square matrix of the square matrix of/2 is added with row information and column information of 0 element,
the network device performs element selection on the space-frequency joint feature public base according to the first rule to determine a space-frequency joint feature base of the second frequency band, including:
for B2 and N in the space-frequency joint characteristic public substrate t2 Extracting elements in row/2, said B2 x N t2 2 act of N corresponding to each of the B2 sub-bands of the second frequency band in the third space-frequency joint channel covariance matrix in the space-frequency joint channel statistical covariance matrix t2 Row/2, wherein the third space-frequency joint channel covariance matrix is B2 x B2 behaviors N contained in the second covariance matrix t2 2, column N t2 The square matrix of/2 increases N according to the row information and the column information indicated by the first rule t1 /2-N t2 Row/2 and N t1 /2-N t2 Column 2 matrix generated after element 0, said matrixN corresponding to each of the B2 sub-bands of the second frequency band in the space-frequency joint channel statistical covariance matrix t2 N corresponding to each of the B2 subbands excluding the second frequency band in the space-frequency joint channel statistical covariance matrix t1 Row of 0 element added in row/2;
and splicing the extracted elements to obtain the space-frequency joint characteristic substrate of the second frequency band.
16. The method of claim 13, wherein N t1 With/2 greater than N t2 2, and B1 is greater than B2, the first rule indicating information of B2 subbands used for calculating the space-frequency joint channel statistical covariance matrix among B1 subbands of the first frequency band, and B2 x B2 behaviors N contained in the second covariance matrix t2 2, column N t2 Row information and column information of 0 element are added to each square matrix in the/2 square matrixes,
the network device performs element selection on the space-frequency joint feature public base according to the first rule to determine a space-frequency joint feature base of the second frequency band, including:
B2×N of the space-frequency joint characteristic public base t1 Line/2 is determined as a third space-frequency joint feature base, wherein the B2 is N t1 N corresponding to the B2 sub-bands of the second frequency band in the fourth space-frequency combined channel covariance matrix t1 The row/2 corresponds to the row in the space-frequency combined channel statistical covariance matrix, and the fourth space-frequency combined channel covariance matrix is B2 x B2 rows N contained in the second space-frequency combined channel covariance matrix t2 2, column N t2 Each of the square matrices of/2 increases by N in accordance with the row information and the column information indicated by the first rule t1 /2-N t2 Row/2 and N t1 /2-N t2 2 columns of matrix generated after 0 elements;
for B2N in the third space-frequency joint characteristic public substrate t2 Extracting elements in row/2, said B2 x N t2 Behavior/2 the fourth space-frequency joint channelN corresponding to each of the B2 subbands of the second frequency band in the covariance matrix in the space-frequency joint channel statistical covariance matrix t2 2 rows, wherein each of the B2 subbands of the second frequency band is respectively corresponding to N in the space-frequency joint channel statistical covariance matrix t2 N corresponding to each of the B2 subbands excluding the second frequency band in the space-frequency joint channel statistical covariance matrix t1 Row of 0 element added in row/2;
and splicing the extracted elements to obtain the space-frequency joint characteristic substrate of the second frequency band.
17. The method of claim 13, wherein N t1 2 is equal to N t2 2, and B1 is greater than B2,
the network device performs element selection on the space-frequency joint feature public base according to the first rule to determine a space-frequency joint feature base of the second frequency band, including:
and the network equipment determines the space-frequency joint characteristic public substrate as the space-frequency joint characteristic substrate of the second frequency band.
18. The method according to any one of claims 13-17, further comprising:
the network device sends first indication information to the terminal device, wherein the first indication information comprises the first rule, and the first indication information is used for indicating the terminal device to perform bit summation on the first space-frequency joint channel covariance matrix and the second space-frequency joint channel covariance matrix according to the first rule.
19. The method according to any one of claims 13-17, further comprising:
the network equipment receives second indication information from the terminal equipment, wherein the second indication information comprises the first rule, and the second indication information indicates the network equipment to intercept the space-frequency joint characteristic public base according to the first rule so as to acquire the space-frequency joint characteristic base of the second frequency band.
20. The method according to any of claims 11-19, wherein the information indicating the spatial-frequency joint characteristic common base comprises: and the selected oversampling group is provided with an index number of a Discrete Fourier Transform (DFT) base vector corresponding to the oversampling group and a projection coefficient of the space-frequency joint characteristic public base on the DFT base vector.
21. A communication device, comprising:
the processing unit is used for determining a space-frequency joint characteristic public substrate according to a first channel matrix and a second channel matrix, wherein the first channel matrix is a channel matrix of a first frequency band measured by terminal equipment, the second channel matrix is a channel matrix of a second frequency band measured by the terminal equipment, the first frequency band and the second frequency band are both communication frequency bands of the terminal equipment and network equipment, and the space-frequency joint characteristic public substrate is used for determining a space-frequency joint characteristic substrate of the first frequency band and a space-frequency joint characteristic substrate of the second frequency band;
and the communication unit is used for sending information for indicating the space-frequency joint characteristic public base to the network equipment.
22. The apparatus according to claim 21, wherein the processing unit is specifically configured to: determining a first space-frequency joint channel covariance matrix according to the first channel matrix, and determining a second space-frequency joint channel covariance matrix according to the second channel matrix; and determining the space-frequency joint characteristic public base according to the first space-frequency joint channel covariance matrix and the second space-frequency joint channel covariance matrix.
23. The apparatus of claim 22, wherein the single polarization direction of the first frequency bandCorresponding antenna port number N t1 And/2 is greater than or equal to the number N of antenna ports corresponding to the single polarization direction of the second frequency band t2 2, and the number of sub-bands B1 corresponding to the first frequency band is larger than or equal to the number of sub-bands B2 corresponding to the second frequency band;
the processing unit is specifically configured to:
performing bit summation on the first space-frequency joint channel covariance matrix and the second space-frequency joint channel covariance matrix according to a first rule, and determining a space-frequency joint channel statistical covariance matrix according to the summed matrix;
determining a singular matrix according to the space-frequency joint channel statistical covariance matrix, and selecting the front L columns of the singular matrix as the space-frequency joint characteristic public base, wherein L is smaller than or equal to B1N t1 2 and B2 x N t2 Smaller value in/2.
24. The apparatus of claim 23, wherein N t1 2 is equal to N t2 Wherein/2, B1 is greater than B2, the first rule indicates information of B2 sub-bands used for calculating the space-frequency joint channel statistical covariance matrix in the B1 sub-bands of the first frequency band,
the processing unit is specifically configured to:
N corresponding to each of the B2 sub-bands in the second space-frequency joint channel covariance matrix t2 The/2 rows are respectively corresponding to N sub-bands in the B2 sub-bands of the first frequency band indicated by the first rule in the first space-frequency joint channel covariance matrix according to the sequence t1 And/2 rows are sequentially aligned and added.
25. The apparatus of claim 23, wherein N t1 With/2 greater than N t2 2, and B1 is equal to B2, the first rule indicating B2 x B2 behaviors N contained in the second covariance matrix t2 2, column N t2 Each square matrix of the square matrix of/2 is added with row information and column information of 0 element,
the processing unit is specifically configured to:
determining a third space-frequency joint channel covariance matrix, wherein the third space-frequency joint channel covariance matrix is B2 x B2 behaviors N contained in the second covariance matrix t2 2, column N t2 Each of the/2 square arrays increases N according to the row information and the column information indicated by the first rule t1 /2-N t2 Row/2 and N t1 /2-N t2 2 columns of matrix generated after 0 elements;
n corresponding to each of the B2 sub-bands in the third space-frequency joint channel covariance matrix t1 N lines/2 are respectively corresponding to each sub-band in the B1 sub-bands in the first space-frequency combined channel covariance matrix according to the sequence t1 And/2 rows are sequentially aligned and added.
26. The apparatus of claim 23, wherein N t1 With/2 greater than N t2 2, and B1 is greater than B2, the first rule indicating information of B2 subbands used for calculating the space-frequency joint channel statistical covariance matrix among B1 subbands of the first frequency band, and B2 x B2 behaviors N contained in the second covariance matrix t2 2, column N t2 Each square matrix of the square matrix of/2 is added with row information and column information of 0 element,
the processing unit is specifically configured to:
determining a fourth space-frequency combined channel covariance matrix, wherein the fourth space-frequency combined channel covariance matrix is formed by B2 x B2 behaviors N contained in the second covariance matrix t2 2, column N t2 Each of the square matrices of/2 increases by N in accordance with the row information and the column information indicated by the first rule t1 /2-N t2 Row/2 and N t1 /2-N t2 2 columns of matrix generated after 0 elements;
n corresponding to each of the B2 sub-bands in the fourth space-frequency joint channel covariance matrix t1 The/2 rows are respectively corresponding to N sub-bands in the B2 sub-bands of the first frequency band indicated by the first rule in the first space-frequency joint channel covariance matrix according to the sequence t1 2 row-by-row And (5) adding the secondary alignment.
27. The apparatus of claim 23, wherein N t1 2 is equal to N t2 And/2, and B1 is equal to B2,
the processing unit is specifically configured to:
n corresponding to each of the B2 sub-bands in the second space-frequency joint channel covariance matrix t1 N lines/2 are respectively corresponding to each sub-band in the B1 sub-bands in the first space-frequency combined channel covariance matrix according to the sequence t2 And/2 rows are sequentially aligned and added.
28. The apparatus according to any one of claims 23-27, wherein the communication unit is further configured to receive first indication information sent from the network device, where the first indication information includes the first rule, and the first indication information is configured to instruct the terminal device to perform a para-summation on the first spatial-frequency joint channel covariance matrix and the second spatial-frequency joint channel covariance matrix according to the first rule.
29. The apparatus according to any one of claims 23-27, wherein the communication unit is further configured to send second indication information to the network device, where the second indication information includes the first rule, and the second indication information indicates that the network device processes the spatial-frequency joint feature common base according to the first rule to obtain a spatial-frequency joint feature base of the second frequency band.
30. The apparatus according to any of claims 21-29, wherein the information indicating the spatial-frequency joint characteristic common base comprises: and the selected oversampling group is provided with an index number of a Discrete Fourier Transform (DFT) base vector corresponding to the oversampling group and a projection coefficient of the space-frequency joint characteristic public base on the DFT base vector.
31. A communication device, comprising:
the communication unit is used for receiving information from the terminal equipment, wherein the information is used for indicating a space-frequency joint characteristic public base, the space-frequency joint characteristic public base is determined by the terminal equipment according to a first channel matrix and a second channel matrix, the first channel matrix is a channel matrix of a first frequency band measured by the terminal equipment, the second channel matrix is a channel matrix of a second frequency band measured by the terminal equipment, and the first frequency band and the second frequency band are communication frequency bands of the network equipment and the terminal equipment;
and the processing unit is used for determining the space-frequency joint characteristic base of the first frequency band and the space-frequency joint characteristic base of the second frequency band according to the information for indicating the space-frequency joint characteristic public base.
32. The apparatus of claim 31, wherein the spatial-frequency joint characteristic common base is determined based on a first spatial-frequency joint channel covariance matrix determined based on the first channel matrix and a second spatial-frequency joint channel covariance matrix determined based on the second spatial-frequency joint channel covariance matrix.
33. The apparatus of claim 32, wherein the single polarization direction of the first frequency band corresponds to a number N of antenna ports t1 And/2 is greater than or equal to the number N of antenna ports corresponding to the single polarization direction of the second frequency band t2 And/2, and the number of sub-bands B1 corresponding to the first frequency band is greater than or equal to the number of sub-bands B2 corresponding to the second frequency band,
the space-frequency joint characteristic public base is formed by the front L columns of a singular matrix, the singular matrix is determined according to a space-frequency joint channel statistical covariance matrix, and the space-frequency joint channel statistical covariance matrix is formed by the first space-frequency joint channel covariance matrix and the second space-frequency joint channel covariance matrix according to a first ruleThe matrix is obtained by carrying out bit summation, wherein L is less than or equal to B1N t1 2 and B2 x N t2 A smaller value in/2;
the processing unit is specifically configured to:
determining the space-frequency joint characteristic public substrate as the space-frequency joint characteristic substrate of the first frequency band;
and selecting elements of the space-frequency joint characteristic public base according to the first rule to determine the space-frequency joint characteristic base of the second frequency band.
34. The apparatus of claim 33, wherein N t1 2 is equal to N t2 Wherein/2, B1 is greater than B2, the first rule indicates information of B2 sub-bands used for calculating the space-frequency joint channel statistical covariance matrix in the B1 sub-bands of the first frequency band,
the processing unit is specifically configured to:
B2×N of the space-frequency joint characteristic public base t2 Line/2 is determined as a space-frequency joint characteristic base of the second frequency band, wherein the B2 is N t2 2, respectively corresponding N of each of the B2 sub-bands of the first frequency band indicated by the first rule in the space-frequency joint channel statistical covariance matrix t1 Row/2.
35. The apparatus of claim 33, wherein N t1 With/2 greater than N t2 2, and B1 is equal to B2, the first rule indicating B2 x B2 behaviors N contained in the second covariance matrix t2 2, column N t2 Each square matrix of the square matrix of/2 is added with row information and column information of 0 element,
the processing unit is specifically configured to:
for B2 and N in the space-frequency joint characteristic public substrate t2 Extracting elements in row/2, said B2 x N t2 2 act of N corresponding to each of the B2 sub-bands of the second frequency band in the third space-frequency joint channel covariance matrix in the space-frequency joint channel statistical covariance matrix t2 Row/2, wherein the third space-frequency joint channel covariance matrix is B2 x B2 behaviors N contained in the second covariance matrix t2 2, column N t2 The square matrix of/2 increases N according to the row information and the column information indicated by the first rule t1 /2-N t2 Row/2 and N t1 /2-N t2 Matrix generated after element 0 in column/2, N corresponding to each of the B2 subbands of the second frequency band in the space-frequency joint channel statistical covariance matrix t2 N corresponding to each of the B2 subbands excluding the second frequency band in the space-frequency joint channel statistical covariance matrix t1 Row of 0 element added in row/2;
and splicing the extracted elements to obtain the space-frequency joint characteristic substrate of the second frequency band.
36. The apparatus of claim 33, wherein N t1 With/2 greater than N t2 2, and B1 is greater than B2, the first rule indicating information of B2 subbands used for calculating the space-frequency joint channel statistical covariance matrix among B1 subbands of the first frequency band, and B2 x B2 behaviors N contained in the second covariance matrix t2 2, column N t2 Row information and column information of 0 element are added to each square matrix in the/2 square matrixes,
the processing unit is specifically configured to:
B2×N of the space-frequency joint characteristic public base t1 Line/2 is determined as a third space-frequency joint feature base, wherein the B2 is N t1 N corresponding to the B2 sub-bands of the second frequency band in the fourth space-frequency combined channel covariance matrix t1 The row/2 corresponds to the row in the space-frequency combined channel statistical covariance matrix, and the fourth space-frequency combined channel covariance matrix is B2 x B2 rows N contained in the second space-frequency combined channel covariance matrix t2 2, column N t2 Each of the square matrices of/2 increases by N in accordance with the row information and the column information indicated by the first rule t1 /2-N t2 Row/2 and N t1 /2-N t2 2 columns of 0 elementsA matrix generated after the element;
for B2N in the third space-frequency joint characteristic public substrate t2 Extracting elements in row/2, said B2 x N t2 2 act of N corresponding to each of the B2 subbands of the second band in the fourth space-frequency joint channel covariance matrix in the space-frequency joint channel statistical covariance matrix t2 2 rows, wherein each of the B2 subbands of the second frequency band is respectively corresponding to N in the space-frequency joint channel statistical covariance matrix t2 N corresponding to each of the B2 subbands excluding the second frequency band in the space-frequency joint channel statistical covariance matrix t1 Row of 0 element added in row/2;
and splicing the extracted elements to obtain the space-frequency joint characteristic substrate of the second frequency band.
37. The apparatus of claim 33, wherein N t1 2 is equal to N t2 2, and B1 is greater than B2,
the processing unit is specifically configured to: and determining the space-frequency joint characteristic public substrate as the space-frequency joint characteristic substrate of the second frequency band.
38. The apparatus according to any one of claims 33-37, wherein the communication unit is further configured to send first indication information to the terminal device, where the first indication information includes the first rule, and the first indication information is configured to instruct the terminal device to perform a bit summation on the first spatial-frequency joint channel covariance matrix and the second spatial-frequency joint channel covariance matrix according to the first rule.
39. The apparatus according to any one of claims 33-37, wherein the communication unit is further configured to receive, from the terminal device, second indication information, where the second indication information includes the first rule, and the second indication information indicates that the network device processes the spatial-frequency joint feature common base according to the first rule to obtain a spatial-frequency joint feature base of the second frequency band.
40. The apparatus of any one of claims 31-39, wherein the information indicating the spatial-frequency joint characteristic common base comprises: and the selected oversampling group is provided with an index number of a Discrete Fourier Transform (DFT) base vector corresponding to the oversampling group and a projection coefficient of the space-frequency joint characteristic public base on the DFT base vector.
41. A communication device comprising at least one processor and at least one memory, the at least one memory to store a computer program or instructions, the at least one processor to execute the computer program or instructions in memory, to cause the method of any one of claims 1 to 10 to be performed or to cause the method of any one of claims 11 to 20 to be performed.
42. A computer readable storage medium having stored therein computer instructions which, when run on a computer, perform the method of any of claims 1 to 10, the method of any of claims 11 to 20.
43. A computer program product, characterized in that the computer program product comprises a computer program code for performing the method according to any of claims 1 to 10 when the computer program code is run on a computer.
44. A chip comprising a processor and a communication interface, the processor reading instructions stored on a memory through the communication interface, performing the method of any one of claims 1 to 10, or performing the method of any one of claims 11 to 20.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211204330.3A CN117792448A (en) | 2022-09-29 | 2022-09-29 | Method for designing multi-band codebook and communication device |
| PCT/CN2023/118721 WO2024067116A1 (en) | 2022-09-29 | 2023-09-14 | Multi-band codebook design method and communication apparatus |
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| CN102291199B (en) * | 2010-06-18 | 2013-11-20 | 电信科学技术研究院 | Method and device for reporting channel state information |
| CN102291222B (en) * | 2010-06-21 | 2014-07-09 | 电信科学技术研究院 | Method, device and system for feeding back precoding matrix indication |
| US10177451B1 (en) * | 2014-08-26 | 2019-01-08 | Ball Aerospace & Technologies Corp. | Wideband adaptive beamforming methods and systems |
| CN111279337B (en) * | 2017-09-06 | 2023-09-26 | 凝聚技术公司 | Wireless communication method implemented by wireless communication receiver device |
| CN114553640B (en) * | 2022-02-18 | 2024-01-30 | 东南大学 | Cross-frequency-band statistical channel state information estimation method in multi-frequency-band large-scale MIMO system |
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