WO2022213780A1 - 信息传输方法及装置 - Google Patents

信息传输方法及装置 Download PDF

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Publication number
WO2022213780A1
WO2022213780A1 PCT/CN2022/081019 CN2022081019W WO2022213780A1 WO 2022213780 A1 WO2022213780 A1 WO 2022213780A1 CN 2022081019 W CN2022081019 W CN 2022081019W WO 2022213780 A1 WO2022213780 A1 WO 2022213780A1
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Prior art keywords
information
indication information
terminal device
ports
access network
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PCT/CN2022/081019
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English (en)
French (fr)
Inventor
袁一凌
葛士斌
范利
高君慧
金黄平
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to EP22783849.7A priority Critical patent/EP4311121A4/en
Publication of WO2022213780A1 publication Critical patent/WO2022213780A1/zh
Priority to US18/478,412 priority patent/US12316419B2/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signalling for the administration of the divided path, e.g. signalling of configuration information
    • H04L5/0094—Indication of how sub-channels of the path are allocated
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • 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
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
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    • 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
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
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    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/046—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account
    • H04B7/0469—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account taking special antenna structures, e.g. cross polarized antennas into account
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    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
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    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
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    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication
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    • H04L25/00—Baseband systems
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    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
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    • H04L27/00—Modulated-carrier systems
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    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2649—Demodulators
    • H04L27/265—Fourier transform demodulators, e.g. fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators
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    • H04L5/0001—Arrangements for dividing the transmission path
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present application relates to the field of communication technologies, and in particular, to an information transmission method and device.
  • massive multiple-input multiple-output multi-input multi-output
  • MIMO massive multiple-input multi-output
  • the wireless access network equipment needs to precode the data before sending the data to the terminal equipment.
  • the radio access network device needs to determine the precoding matrix for precoding according to the channel state information (channel state information, CSI) of the downlink channel fed back by the terminal device to the radio access network device.
  • channel state information channel state information, CSI
  • the reciprocity of the channel can be used to obtain the CSI of the downlink channel through the uplink channel, and then determine the precoding matrix.
  • TDD time division duplexing
  • FDD frequency division duplexing
  • the uplink and downlink channels do not have complete reciprocity, but partial reciprocity. sex.
  • the current parameter configuration of the codebook structure for precoding does not take into account the partial reciprocity of FDD, and is not flexible enough.
  • the present application provides an information transmission method and device, which are used to solve the problem that the parameter configuration of the codebook structure is not flexible enough in the FDD system.
  • an information transmission method comprising: a terminal device receiving first indication information and second indication information from a wireless access network device, and also receiving a reference signal from the wireless access network device, according to the first indication One indication information, the second indication information and the reference signal send downlink channel state information to the radio access network device.
  • the first indication information is used to indicate the first information and the second information
  • the second indication information is used to indicate the number of the first DFT vectors
  • the first DFT vector number is one of the numbers of at least one DFT vector
  • the DFT vector The number is the number of possible DFT vectors included in the frequency domain basis matrix.
  • the first information is used to indicate the number of the first selection port, the first selection port number is one of the at least one selection port number, and the selection port number is the terminal equipment.
  • the number of possible ports used for port selection is used to indicate the first compression factor, the first compression factor is one of at least one compression factor, the compression factor is a possible compression factor of the complex coefficient matrix, the complex coefficient matrix It is determined according to the port selected by the terminal device and the frequency domain basis matrix.
  • the compression factor has a corresponding relationship with the number of transmission layers.
  • the number of transmission layers refers to the possible transmission layers corresponding to the downlink channel state information reported by the terminal device to the wireless access network device. number.
  • the number of transmission layers is no longer bound to the number of DFT vectors, but is bound to the compression factor. Since the compression factor has many values, it can solve the problem that the number of DFT vectors is less. In this case, the configuration of the relevant parameters of the existing codebook structure cannot satisfy the problem of flexibly adjusting the number of non-zero elements in the complex coefficient matrix.
  • the number of selected ports is the number of ports used by the terminal device for port selection in each polarization direction.
  • the terminal device can determine the number of ports to be selected in each polarization direction.
  • the first indication information is implemented by a first index in a first table, the first table includes a correspondence between at least one selected port number and at least one compression factor, and the first index is used for Indicates the first selected port number and the first compression factor; wherein, the compression factors corresponding to different transmission layer numbers are the same; or, the compression factors corresponding to at least two transmission layer numbers among different transmission layer numbers are different.
  • the radio access network device indicates the number of the first selected ports and the first compression factor through the first index, which can reduce signaling overhead compared to directly indicating the number of the first selected ports and the first compression factor.
  • the second indication information is further used to indicate the number of the first sending ports, the first sending port number is one of the numbers of at least one sending port, and the sending port number is the reference signal sent by the wireless access network device number of possible ports.
  • the number of the first sending ports and the number of the first DFT vectors can be indicated to the terminal device at the same time, which can reduce signaling overhead.
  • the second indication information is implemented by a second index in the second table, the second table includes a correspondence between the number of at least one sending port and the number of at least one DFT vector, and the second index It is used to indicate the number of the first sending port and the number of the first DFT vector.
  • the wireless access network device indicates the number of the first transmission ports and the number of the first DFT vectors through the second index. Compared with directly indicating the number of the first transmission ports and the number of the first DFT vectors, the information can be reduced. make overhead.
  • the method further includes: the terminal device receives second configuration information from the wireless access network device, where the second configuration information is used to configure the second table.
  • the terminal device can determine the second table, so that when the radio access network device indicates the index in the second table, the terminal device can determine the number of sending ports and the number of DFT vectors according to the index.
  • the first indication information and the second indication information are implemented by a first index in a first table, and the first table includes at least one DFT vector number, at least one selection port number, and at least one compression Correspondence between factors, the first index is used to indicate the number of the first DFT vector, the number of the first selection port and the first compression factor; wherein, the compression factors corresponding to different transmission layers are the same; or, different transmission layers The compression factors corresponding to at least two transmission layer numbers in the numbers are different.
  • the radio access network device indicates the number of the first selected ports, the first compression factor and the number of the first DFT vectors through the first index, compared to directly indicating the number of the first selected ports, the first compression factor and the number of the first DFT vectors.
  • the number of the first DFT vectors can reduce signaling overhead.
  • the method further includes: the terminal device receives first configuration information from the wireless access network device, where the first configuration information is used to configure the first table.
  • the terminal device can determine the first table, so that when the wireless access network device indicates the index in the first table, the terminal device can determine the number of selected ports, the compression factor and the number of DFT vectors according to the index one or more of.
  • the number of DFT vectors is 1 or 2.
  • an information transmission method including: a wireless access network device sending, to a terminal device, first indication information for indicating the first information and the second information and a first indication information for indicating the number of the first DFT vectors 2. Indication information, and send a reference signal to the terminal device.
  • the first indication information, the second indication information and the reference signal are used by the terminal equipment to determine the downlink channel state information.
  • the number of the first DFT vectors is one of the numbers of at least one DFT vector, the number of DFT vectors is the number of possible DFT vectors included in the frequency domain basis matrix, the first information is used to indicate the number of the first selection port, the first The number of selected ports is one of at least one selected port number, the number of selected ports is the number of possible ports used by the terminal device for port selection, the second information is used to indicate the first compression factor, and the first compression factor is at least one compression factor One of them, the compression factor is a possible compression factor of the complex coefficient matrix.
  • the complex coefficient matrix is determined according to the port selected by the terminal device and the frequency domain basis matrix.
  • the compression factor has a corresponding relationship with the number of transmission layers, and the number of transmission layers refers to the terminal.
  • the number of possible transmission layers corresponding to the downlink channel state information reported by the device to the radio access network device is no longer bound to the number of DFT vectors, but is bound to the compression factor. Since the compression factor has many values, it can solve the problem that the number of DFT vectors is less. In this case, the configuration of the relevant parameters of the existing codebook structure cannot satisfy the problem of flexibly adjusting the number of non-zero elements in the complex coefficient matrix.
  • the method further includes: the radio access network device receives downlink channel state information from the terminal device; the radio access network device determines a precoding matrix according to the downlink channel state information; the radio access network device The data is precoded according to the precoding matrix.
  • the number of selected ports is the number of ports used by the terminal device for port selection in each polarization direction.
  • the terminal device can determine the number of ports to be selected in each polarization direction.
  • the first indication information is implemented by a first index in a first table, the first table includes a correspondence between at least one selected port number and at least one compression factor, and the first index is used for Indicates the first selected port number and the first compression factor; wherein, the compression factors corresponding to different transmission layer numbers are the same; or, the compression factors corresponding to at least two transmission layer numbers among different transmission layer numbers are different.
  • the radio access network device indicates the number of the first selected ports and the first compression factor through the first index, which can reduce signaling overhead compared to directly indicating the number of the first selected ports and the first compression factor.
  • the second indication information is further used to indicate the number of the first sending ports, the first sending port number is one of the numbers of at least one sending port, and the sending port number is the reference signal sent by the wireless access network device number of possible ports.
  • the number of the first sending ports and the number of the first DFT vectors can be indicated to the terminal device at the same time, which can reduce signaling overhead.
  • the second indication information is implemented by a second index in the second table, the second table includes a correspondence between the number of at least one sending port and the number of at least one DFT vector, and the second index It is used to indicate the number of the first sending port and the number of the first DFT vector.
  • the wireless access network device indicates the number of the first transmission ports and the number of the first DFT vectors through the second index. Compared with directly indicating the number of the first transmission ports and the number of the first DFT vectors, the information can be reduced. make overhead.
  • the method further includes: the wireless access network device sends second configuration information to the terminal device, where the second configuration information is used to configure the second table.
  • the terminal device can determine the second table, so that when the radio access network device indicates the index in the second table, the terminal device can determine the number of sending ports and the number of DFT vectors according to the index.
  • the first indication information and the second indication information are implemented by a first index in a first table, and the first table includes at least one DFT vector number, at least one selection port number, and at least one compression Correspondence between factors, the first index is used to indicate the number of the first DFT vector, the number of the first selection port and the first compression factor; wherein, the compression factors corresponding to different transmission layers are the same; or, different transmission layers The compression factors corresponding to at least two transmission layer numbers in the numbers are different.
  • the radio access network device indicates the number of the first selected ports, the first compression factor and the number of the first DFT vectors through the first index, compared to directly indicating the number of the first selected ports, the first compression factor and the number of the first DFT vectors.
  • the number of the first DFT vectors can reduce signaling overhead.
  • the method further includes: the wireless access network device sends first configuration information to the terminal device, where the first configuration information is used to configure the first table.
  • the terminal device can determine the first table, so that when the wireless access network device indicates the index in the first table, the terminal device can determine the number of selected ports, the compression factor and the number of DFT vectors according to the index one or more of.
  • the number of DFT vectors is 1 or 2.
  • an information transmission method comprising: a terminal device receiving second indication information and third indication information from a wireless access network device, where the second indication information is used to indicate the first indication
  • the number of DFT vectors the first number of DFT vectors is one of the numbers of at least one DFT vector, the number of DFT vectors is the number of possible DFT vectors included in the frequency domain basis matrix
  • the third indication The information is used to indicate a first compression factor, the first compression factor is one of at least one compression factor, the compression factor is a possible compression factor of a complex coefficient matrix, and the complex coefficient matrix is selected according to the terminal device.
  • the compression factor has a corresponding relationship with the number of transmission layers, and the number of transmission layers refers to the corresponding downlink channel state information reported by the terminal device to the radio access network device. the number of possible transmission layers; the terminal device receives the reference signal from the radio access network device; the terminal device sends the reference signal to the The radio access network device sends the downlink channel state information.
  • the number of transmission layers is no longer bound to the number of DFT vectors, but is bound to the compression factor. Since the compression factor has a large number of values, it can solve the problem that the number of DFT vectors is less. In this case, the configuration of the relevant parameters of the existing codebook structure cannot satisfy the problem of flexibly adjusting the number of non-zero elements in the complex coefficient matrix.
  • the second indication information is further used to indicate the first sending port number, the first sending port number is one of at least one sending port number, and the sending port number is the The number of possible ports through which the radio access network device sends the reference signal.
  • the number of the first sending ports and the number of the first DFT vectors can be indicated to the terminal device at the same time, which can reduce signaling overhead.
  • the second indication information is implemented by a second index in a second table, where the second table includes at least one of the number of the sending ports and the number of at least one of the DFT vectors
  • the second index is used to indicate the number of the first sending ports and the number of the first DFT vectors.
  • the wireless access network device indicates the number of the first transmission ports and the number of the first DFT vectors through the second index. Compared with directly indicating the number of the first transmission ports and the number of the first DFT vectors, the information can be reduced. make overhead.
  • the method further includes: receiving, by the terminal device, second configuration information from the wireless access network device, where the second configuration information is used to configure the second table.
  • the terminal device can determine the second table, so that when the radio access network device indicates the index in the second table, the terminal device can determine the number of sending ports and the number of DFT vectors according to the index.
  • the number of selected ports is a preset value
  • the number of selected ports is a port used for port selection when the terminal device sends the downlink channel state information to the wireless access network device number.
  • the number of the DFT vectors is 1.
  • an information transmission method comprising: a wireless access network device sending second indication information and third indication information to a terminal device, where the second indication information is used to indicate the number of the first DFT vectors, so The first DFT vector number is one of at least one DFT vector number, the DFT vector number is the number of possible DFT vectors included in the frequency domain basis matrix, and the third indication information is used to indicate the first DFT vector number.
  • the first compression factor is one of at least one compression factor
  • the compression factor is a possible compression factor of a complex coefficient matrix
  • the complex coefficient matrix is based on the port selected by the terminal device and the frequency determined by the domain basis matrix
  • the compression factor has a corresponding relationship with the number of transmission layers
  • the number of transmission layers refers to the possible number of transmission layers corresponding to the downlink channel state information reported by the terminal device to the wireless access network device ;
  • the radio access network device sends a reference signal to the terminal device; wherein the second indication information, the third indication information and the reference signal are used to determine the downlink channel state information.
  • the number of transmission layers is no longer bound to the number of DFT vectors, but is bound to the compression factor.
  • the compression factor Since the compression factor has a large number of values, it can solve the problem that the number of DFT vectors is less. In this case, the configuration of the relevant parameters of the existing codebook structure cannot satisfy the problem of flexibly adjusting the number of non-zero elements in the complex coefficient matrix.
  • the method further includes: the radio access network device receiving the downlink channel state information from the terminal device; the radio access network device according to the downlink channel state information The information determines a precoding matrix; the radio access network device precodes data according to the precoding matrix.
  • the second indication information is further used to indicate the first sending port number, the first sending port number is one of at least one sending port number, and the sending port number is the The number of possible ports through which the radio access network device sends the reference signal.
  • the number of the first sending ports and the number of the first DFT vectors can be indicated to the terminal device at the same time, which can reduce signaling overhead.
  • the second indication information is implemented by a second index in a second table, where the second table includes at least one of the number of the sending ports and the number of at least one of the DFT vectors
  • the second index is used to indicate the number of the first sending ports and the number of the first DFT vectors.
  • the wireless access network device indicates the number of the first transmission ports and the number of the first DFT vectors through the second index. Compared with directly indicating the number of the first transmission ports and the number of the first DFT vectors, the information can be reduced. make overhead.
  • the method further includes: the wireless access network device sends second configuration information to the terminal device, where the second configuration information is used to configure the second table.
  • the terminal device can determine the second table, so that when the radio access network device indicates the index in the second table, the terminal device can determine the number of sending ports and the number of DFT vectors according to the index.
  • the number of selected ports is a preset value
  • the number of selected ports is a port used for port selection when the terminal device sends the downlink channel state information to the wireless access network device number.
  • the number of the DFT vectors is 1.
  • a communication device comprising: a communication unit and a processing unit; the processing unit is configured to receive first indication information and second indication information from a wireless access network device through the communication unit, the first indication information Used to indicate the first information and the second information, the second indication information is used to indicate the number of the first DFT vector, the first DFT vector number is one of at least one DFT vector number, and the DFT vector number is the frequency domain base The number of possible DFT vectors included in the matrix, the first information is used to indicate the first selection port number, the first selection port number is one of at least one selection port number, and the selection port number is used by the communication device for port selection.
  • the second information is used to indicate the first compression factor
  • the first compression factor is one of at least one compression factor
  • the compression factor is a possible compression factor of the complex coefficient matrix
  • the complex coefficient matrix is selected according to the communication device Determined by the port and the base matrix in the frequency domain
  • the compression factor has a corresponding relationship with the number of transmission layers
  • the number of transmission layers refers to the possible number of transmission layers corresponding to the downlink channel state information reported by the communication device to the wireless access network equipment
  • the processing unit is also used to send the downlink channel status to the wireless access network device through the communication unit according to the first indication information, the second indication information and the reference signal information.
  • the communication apparatus is a terminal device.
  • the number of selected ports is the number of ports used by the communication device for port selection in each polarization direction.
  • the first indication information is implemented by a first index in a first table, the first table includes a correspondence between at least one selected port number and at least one compression factor, and the first index is used for Indicates the first selected port number and the first compression factor; wherein, the compression factors corresponding to different transmission layer numbers are the same; or, the compression factors corresponding to at least two transmission layer numbers among different transmission layer numbers are different.
  • the second indication information is further used to indicate the number of the first sending ports, the first sending port number is one of the numbers of at least one sending port, and the sending port number is the reference signal sent by the wireless access network device number of possible ports.
  • the second indication information is implemented by a second index in the second table, the second table includes a correspondence between the number of at least one sending port and the number of at least one DFT vector, and the second index It is used to indicate the number of the first sending port and the number of the first DFT vector.
  • the processing unit is further configured to receive second configuration information from the wireless access network device through the communication unit, where the second configuration information is used to configure the second table.
  • the first indication information and the second indication information are implemented by a first index in a first table, and the first table includes at least one DFT vector number, at least one selection port number, and at least one compression Correspondence between factors, the first index is used to indicate the number of the first DFT vector, the number of the first selection port and the first compression factor; wherein, the compression factors corresponding to different transmission layers are the same; or, different transmission layers The compression factors corresponding to at least two transmission layer numbers in the numbers are different.
  • the processing unit is further configured to receive, through the communication unit, first configuration information from the wireless access network device, where the first configuration information is used to configure the first table.
  • the number of DFT vectors is 1 or 2.
  • a communication apparatus comprising: a communication unit and a processing unit; the processing unit is configured to send first indication information and second indication information to a terminal device through the communication unit, where the first indication information is used to indicate the first indication information and second information, the second indication information is used to indicate the number of first DFT vectors, the number of first DFT vectors is one of the numbers of at least one DFT vector, and the number of DFT vectors is a possible number of DFT vectors included in the frequency domain basis matrix
  • the number of DFT vectors, the first information is used to indicate the number of first selected ports, the first selected port number is one of at least one selected port number, and the selected port number is the number of possible ports used by the terminal device for port selection,
  • the second information is used to indicate the first compression factor, the first compression factor is one of at least one compression factor, the compression factor is a possible compression factor of the complex coefficient matrix, and the complex coefficient matrix is based on the port selected by the terminal device and the frequency domain base Determined by the matrix, the
  • the processing unit is further configured to: receive downlink channel state information from the terminal device through the communication unit; determine a precoding matrix according to the downlink channel state information; and precode data according to the precoding matrix.
  • the number of selected ports is the number of ports used by the terminal device for port selection in each polarization direction.
  • the first indication information is implemented by a first index in a first table, the first table includes a correspondence between at least one selected port number and at least one compression factor, and the first index is used for Indicates the first selected port number and the first compression factor; wherein, the compression factors corresponding to different transmission layer numbers are the same; or, the compression factors corresponding to at least two transmission layer numbers among different transmission layer numbers are different.
  • the second indication information is further used to indicate the number of the first sending port, the first sending port number is one of the at least one sending port number, and the sending port number is a possible number of the communication device sending the reference signal number of ports.
  • the second indication information is implemented by a second index in the second table, the second table includes a correspondence between the number of at least one sending port and the number of at least one DFT vector, and the second index It is used to indicate the number of the first sending port and the number of the first DFT vector.
  • the processing unit is further configured to send second configuration information to the terminal device through the communication unit, where the second configuration information is used to configure the second table.
  • the first indication information and the second indication information are implemented by a first index in a first table, and the first table includes at least one DFT vector number, at least one selection port number, and at least one compression Correspondence between factors, the first index is used to indicate the number of the first DFT vector, the number of the first selection port and the first compression factor; wherein, the compression factors corresponding to different transmission layers are the same; or, different transmission layers The compression factors corresponding to at least two transmission layer numbers in the numbers are different.
  • the processing unit is further configured to send first configuration information to the terminal device through the communication unit, where the first configuration information is used to configure the first table.
  • the number of DFT vectors is 1 or 2.
  • a communication apparatus including: a communication unit and a processing unit; the processing unit is configured to receive second indication information and third indication information from a wireless access network device through the communication unit, The second indication information is used to indicate the number of the first DFT vectors, the number of the first DFT vectors is one of the numbers of at least one DFT vector, and the number of the DFT vectors is a possible number of DFT vectors included in the frequency domain basis matrix.
  • the number of DFT vectors, the third indication information is used to indicate the first compression factor, the first compression factor is one of at least one compression factor, and the compression factor is a possible compression factor of the complex coefficient matrix, so
  • the complex coefficient matrix is determined according to the port selected by the terminal device and the frequency domain basis matrix, the compression factor has a corresponding relationship with the number of transmission layers, and the number of transmission layers refers to the number of the number of possible transmission layers corresponding to the downlink channel state information reported by the access network device;
  • the processing unit is further configured to receive the reference signal from the wireless access network device through the communication unit; the processing unit, It is further configured to send the downlink channel state information to the radio access network device through the communication unit according to the second indication information, the third indication information and the reference signal.
  • the communication apparatus is a terminal device.
  • the second indication information is further used to indicate the first sending port number, the first sending port number is one of at least one sending port number, and the sending port number is the The number of possible ports through which the radio access network device sends the reference signal.
  • the second indication information is implemented by a second index in a second table, where the second table includes at least one of the number of the sending ports and the number of at least one of the DFT vectors
  • the second index is used to indicate the number of the first sending ports and the number of the first DFT vectors.
  • the processing unit is further configured to receive, through the communication unit, second configuration information from the wireless access network device, where the second configuration information is used to configure the first configuration information. Two forms.
  • the number of selected ports is a preset value
  • the number of selected ports is a port used for port selection when the communication apparatus sends the downlink channel state information to the wireless access network device number.
  • the number of the DFT vectors is 1.
  • a communication apparatus comprising: a communication unit and a processing unit; the processing unit is configured to send second indication information and third indication information to a terminal device through the communication unit, the second indication
  • the information is used to indicate the number of the first DFT vectors, the number of the first DFT vectors is one of the numbers of at least one DFT vector, and the number of the DFT vectors is the number of possible DFT vectors included in the frequency domain basis matrix
  • the third indication information is used to indicate a first compression factor, the first compression factor is one of at least one compression factor, and the compression factor is a possible compression factor of a complex coefficient matrix, and the complex coefficient matrix is Determined according to the port selected by the terminal device and the frequency domain basis matrix, the compression factor has a corresponding relationship with the number of transmission layers, and the number of transmission layers refers to the downlink channel reported by the terminal device to the communication device the number of possible transmission layers corresponding to the status information; the processing unit is further configured to send a reference signal to the terminal device through the communication
  • the processing unit is further configured to: receive the downlink channel state information from the terminal device through the communication unit; determine a precoding matrix according to the downlink channel state information; Data is precoded according to the precoding matrix.
  • the second indication information is further used to indicate the first sending port number, the first sending port number is one of at least one sending port number, and the sending port number is the The number of possible ports through which the radio access network device sends the reference signal.
  • the second indication information is implemented by a second index in a second table, where the second table includes at least one of the number of the sending ports and the number of at least one of the DFT vectors
  • the second index is used to indicate the number of the first sending ports and the number of the first DFT vectors.
  • the processing unit is further configured to send second configuration information to the terminal device through the communication unit, where the second configuration information is used to configure the second table.
  • the number of selected ports is a preset value
  • the number of selected ports is the number of ports used for port selection when the terminal device sends the downlink channel state information to the communication apparatus.
  • the number of the DFT vectors is 1.
  • a communication device comprising: a processor.
  • the processor is connected to the memory, the memory is used for storing computer-executed instructions, and the processor executes the computer-executed instructions stored in the memory, thereby implementing any one of the methods provided in any one of the first to fourth aspects.
  • the memory and the processor may be integrated together, or may be independent devices. In the latter case, the memory may be located in the communication device or outside the communication device.
  • the processor includes a logic circuit, and also includes an input interface and/or an output interface.
  • the output interface is used for performing the sending action in the corresponding method
  • the input interface is used for performing the receiving action in the corresponding method.
  • the communication device further includes a communication interface and a communication bus, and the processor, the memory and the communication interface are connected through the communication bus.
  • the communication interface is used to perform the actions of transceiving in the corresponding method.
  • the communication interface may also be referred to as a transceiver.
  • the communication interface includes at least one of a transmitter and a receiver. In this case, the transmitter is configured to perform the sending action in the corresponding method, and the receiver is configured to perform the receiving action in the corresponding method.
  • the communication device exists in the form of a chip product.
  • a tenth aspect provides a chip, comprising: a processor and an interface, the processor is coupled to a memory through the interface, and when the processor executes a computer program in the memory or a computer executes instructions, the first to fourth aspects Any method provided by any aspect is performed.
  • a communication system including: the above wireless access network device and/or the above terminal device.
  • a twelfth aspect provides a computer-readable storage medium, including computer-executable instructions, which, when the computer-executable instructions are run on a computer, cause the computer to execute any one of the first to fourth aspects. a method.
  • a thirteenth aspect provides a computer program product comprising computer-executable instructions, which, when the computer-executable instructions are run on a computer, cause the computer to perform any one of the methods provided in any one of the first to fourth aspects .
  • FIG. 1 is a schematic diagram of a network architecture
  • FIG. 2 is a flowchart of acquiring complete CSI of a downlink channel according to an embodiment of the present application
  • FIG. 3 is a schematic diagram of a process of precoding CSI-RS on a subband according to an embodiment of the present application
  • 4A is a schematic diagram of a simulation result provided by an embodiment of the present application.
  • 4B is a schematic diagram of an information transmission method provided by an embodiment of the present application.
  • FIG. 5 is a schematic diagram of a simulation result provided by an embodiment of the present application.
  • FIG. 6 is a schematic diagram of another information transmission method provided by an embodiment of the present application.
  • FIG. 7 is a schematic diagram of the composition of a communication device according to an embodiment of the present application.
  • FIG. 8 is a schematic diagram of a hardware structure of a communication device provided by an embodiment of the present application.
  • FIG. 9 is a schematic diagram of a hardware structure of another communication apparatus provided by an embodiment of the present application.
  • the transmitting device (such as a wireless access network device) can process the signal to be transmitted by means of a precoding matrix matching the channel state when the channel state is known, so that the precoded signal to be transmitted is adapted to the channel , thereby reducing the complexity of the receiving device (such as a terminal device) to eliminate the influence between channels. Therefore, the received signal quality (eg, signal to interference plus noise ratio (SINR), etc.) is improved through the precoding process of the signal to be transmitted.
  • SINR signal to interference plus noise ratio
  • the precoding technology can realize the transmission on the same time-frequency resource between the sending device and multiple receiving devices, that is, realize the multi-user multiple input multiple output (MU-MIMO).
  • MU-MIMO multi-user multiple input multiple output
  • the radio access network device mainly determines the precoding matrix by relying on the CSI of the downlink channel, and then precodes the data.
  • the radio access network device may also perform precoding on the data in other manners, for example, in the case where the CSI cannot be obtained, precoding is performed by using a preset precoding matrix or a weighting processing manner, and the like. For the sake of brevity, the specific content will not be repeated here.
  • CSI report can also be referred to as CSI for short.
  • CSI is information that is reported by a receiving device (eg, a terminal device) to a sending device (eg, a radio access network device) in a wireless communication system and used to describe the channel attribute of a communication link.
  • CSI may include, but is not limited to, precoding matrix indicator (PMI), rank indicator (RI), channel quality indicator (CQI), layer indicator (layer indicator, LI), etc. .
  • PMI is primarily concerned in this application. It should be noted that, after the terminal device reports the PMI to the radio access network device, the radio access network device needs to combine the PMI and other factors to determine the final used precoding matrix.
  • PMI can be used to indicate the precoding matrix.
  • the precoding matrix may be, for example, a precoding matrix determined by the terminal device based on the channel matrix of each frequency domain unit. PMI can also be called a codebook.
  • the transport layer may also be referred to as the spatial layer.
  • a spatial layer can be viewed as a data stream that can be transmitted independently.
  • the wireless access network equipment can transmit data to the terminal equipment in parallel through multiple spatial layers.
  • the number of transmission layers is also the Rank of the channel matrix.
  • multipath When a wireless signal is transmitted through a wireless channel, multiple paths (referred to as multipath) can be passed from the transmitting antenna to the receiving antenna. Each path in the multipath corresponds to a delay information and an angle information.
  • the delay information is the transmission time of the wireless signal on different paths, which is determined by the distance and speed, and has nothing to do with the frequency domain of the wireless signal.
  • wireless signals are transmitted on different paths, there are different transmission delays due to different distances. Since the physical locations between the wireless access network equipment and the terminal equipment are fixed, the multipath distribution of the uplink and downlink channels is the same in time delay. Therefore, the delay information of the uplink and downlink channels in the FDD system can be considered to be the same, or reciprocal.
  • the angle information may refer to the angle of arrival (AOA) of the wireless signal reaching the receiving antenna via the wireless channel, or it may refer to the angle of departure (AOD) of the signal transmitted through the transmitting antenna.
  • the angle information may refer to the arrival angle of the uplink signal reaching the wireless access network device, or may refer to the departure angle of the wireless access network device transmitting the downlink signal. Due to the reciprocity of the transmission paths of the uplink and downlink channels on different frequencies, the arrival angle of the uplink signal and the departure angle of the downlink signal can be considered to be reciprocal.
  • the angle information may actually be an angle vector, and the delay information may actually be a delay vector.
  • a pair of delay information and angle information is referred to as an angle delay pair.
  • the frequency domain vector can also be called as a frequency domain component vector, a frequency domain basis vector, etc., and can be used to represent the variation law of the channel in the frequency domain.
  • the transmitting antenna can travel through multiple paths to the receiving antenna.
  • the frequency selective fading caused by multipath delay is the change of the frequency domain channel. Therefore, the variation law of the channel in the frequency domain caused by the delay on different transmission paths can be represented by different frequency domain vectors.
  • a frequency domain vector corresponds to a delay information.
  • the frequency domain vector may be a discrete Fourier transform (discrete fourier transformation, DFT) vector.
  • DFT discrete fourier transformation
  • Spatial domain vectors may also be referred to as spatial domain component vectors, beam vectors, spatial domain beam basis vectors, spatial domain basis vectors, and the like.
  • Each element in the spatial vector may represent the weight of each antenna port. Based on the weight of each antenna port represented by each element in the space vector, the signals of each antenna port are linearly superimposed to form a region with strong signals in a certain direction in space.
  • An airspace vector corresponds to an angle information.
  • the spatial vector may be a DFT vector.
  • the reference signal may also be referred to as a pilot signal, a reference sequence, or the like.
  • the reference signal may be a reference signal used for channel measurement.
  • the reference signal may be a CSI-RS used for downlink channel measurement, or may be a channel sounding reference signal (sounding reference signal, SRS) used for uplink channel measurement.
  • SRS sounding reference signal
  • the RS used to obtain the CSI of the downlink channel may also be referred to as a downlink reference signal or CSI-RS.
  • the radio access network equipment can precode the reference signal and send it to the terminal equipment.
  • the precoding may specifically include beamforming (beamforming) and phase rotation.
  • the beamforming may be implemented by precoding the reference signal based on one or more angle vectors, for example, and the phase rotation may be implemented by precoding the reference signal based on one or more delay vectors, for example.
  • the port in this application refers to the port of the reference signal, and specifically refers to the antenna port used for transmitting the reference signal, and the radio access network device can configure the number P of ports of the reference signal.
  • each port of the reference signal may be loaded with angle information and/or delay information, that is, each port may be a port after beamforming and/or phase rotation.
  • the reference signal of each port may be obtained by precoding the reference signal based on an angle vector and/or a delay vector.
  • ports refer to ports that transmit downlink reference signals (eg, CSI-RS).
  • P ports in the following refer to P ports that transmit downlink reference signals
  • the reference signal for each port can be transmitted through one or more frequency domain units. It is assumed that the transmission bandwidth of the reference signal of each port is N frequency domain units.
  • the N frequency domain units may be continuous or discontinuous frequency domain units.
  • the frequency domain unit may also be referred to as a frequency unit, which represents a unit of frequency domain resources, and can represent different granularity of frequency domain resources.
  • the frequency domain unit may include, for example, but is not limited to, one or more subbands (subband, SB), one or more resource blocks (RB), one or more resource block groups (resource block group, RBG), one or more A precoding resource block group (precoding resource block group, PRG), etc.
  • subband subband
  • RB resource blocks
  • RBG resource block group
  • precoding resource block group precoding resource block group
  • the methods provided in the embodiments of the present application can be applied to long term evolution (long term evolution, LTE) systems, fifth generation (5th-generation, 5G) systems, new radio (new radio, NR) systems, wireless local area networks (wireless local area networks) , WLAN) system and future evolution system or a variety of communication fusion systems.
  • the 5G system may be a non-standalone (NSA) 5G system or an independent (standalone, SA) 5G system.
  • NSA non-standalone
  • SA standalone
  • the network elements involved in this application include wireless access network equipment and terminal equipment, and uplink and downlink communication can be performed between the wireless access network equipment and the terminal equipment.
  • a wireless access network device and a plurality of terminal devices form a communication system.
  • one or more terminal equipments among terminal equipment 1 to terminal equipment 6 can send uplink information to wireless access network equipment, and wireless access network equipment can also send downlink information to terminal equipment 1 to terminal equipment 6 one or more terminal devices in the .
  • some terminal devices (for example, terminal device 4 to terminal device 6 ) may also form another communication system.
  • sidelink communication can be performed between terminal devices.
  • terminal device 5 can send sidelink information to terminal device 4 and terminal device 6 .
  • a radio access network device is an entity on the network side that is used for sending a signal, or receiving a signal, or sending a signal and receiving a signal.
  • the radio access network device may be a device deployed in a radio access network (radio access network, RAN) to provide a wireless communication function for a terminal device, for example, a base station.
  • the wireless access network equipment can be various forms of macro base station, micro base station (also called small station), relay station, access point (AP), etc., and can also include various forms of control nodes, such as network control device.
  • the control node can be connected to multiple base stations, and configure resources for multiple terminal devices covered by the multiple base stations. In systems using different radio access technologies, the names of devices with base station functions may vary.
  • GSM global system for mobile communication
  • CDMA code division multiple access
  • BTS base transceiver station
  • WCDMA wideband code division multiple access
  • NodeB base station
  • LTE system can be called evolved base station (evolved NodeB, eNB or eNodeB)
  • NR system can be called next generation node (next generation node) basestation, gNB), this application does not limit the specific name of the base station.
  • the radio access network device may also be a wireless controller in a cloud radio access network (cloud radio access network, CRAN) scenario, or a radio access network device in a future evolved public land mobile network (public land mobile network, PLMN). , transmission and reception point (transmission and reception point, TRP), etc.
  • cloud radio access network cloud radio access network
  • PLMN public land mobile network
  • TRP transmission and reception point
  • the terminal device is used to provide one or more of voice services and data connectivity services to the user, and the terminal device is an entity on the user side for receiving signals, or sending signals, or receiving and sending signals.
  • Terminal equipment may also be referred to as user equipment (UE), terminal, access terminal, subscriber unit, subscriber station, mobile station, remote station, remote terminal, mobile terminal, mobile device, user terminal, wireless communication device, user agent or user device.
  • the terminal device can be a mobile station (mobile station, MS), a subscriber unit (subscriber unit), an unmanned aerial vehicle, an internet of things (IoT) device, or a station (station in wireless local area networks, WLAN).
  • IoT internet of things
  • the terminal device may also be a terminal device in a next-generation communication system, for example, a terminal device in a future evolved PLMN, a terminal device in an NR system, and the like.
  • the uplink and downlink channels have partial reciprocity, and the information with reciprocity includes time delay information and angle information. Therefore, the downlink CSI acquisition scheme can be designed based on the partial reciprocity of FDD.
  • the radio access network equipment can use the partial reciprocity of FDD to load the reciprocity information obtained from the uplink channel into the reference signal, and send the reference signal to the terminal equipment, and the terminal equipment only needs to feed back the non-reciprocal information.
  • the radio access network equipment uses the non-reciprocal information fed back by the terminal equipment and combines the reciprocity information to determine the complete information related to the precoding matrix, and then determines the complete CSI of the downlink channel.
  • the process of acquiring the complete CSI of the downlink channel by the radio access network device includes:
  • the terminal device sends an uplink reference signal to the radio access network device.
  • the radio access network device receives the uplink reference signal from the terminal device.
  • the radio access network device determines an uplink channel matrix (ie, uplink CSI) according to the uplink reference signal, and estimates delay information and angle information according to the uplink channel matrix.
  • uplink channel matrix ie, uplink CSI
  • the radio access network equipment loads the delay information and angle information into the downlink reference signal.
  • the radio access network device may send configuration information to the terminal device, where the configuration information is used to configure the transmission period and time-frequency resources of the downlink reference signal, so that the terminal device receives the downlink reference signal on the corresponding resources.
  • the radio access network device sends a downlink reference signal to the terminal device.
  • the terminal device receives the downlink reference signal.
  • the terminal device determines the information in the codebook structure of the codebook according to the downlink reference signal, and the information in the codebook structure of the codebook includes the complex coefficients of the delay information and the angle information (ie, W 2 hereinafter).
  • the terminal equipment feeds back the CSI of the downlink channel.
  • the radio access network device receives the CSI of the downlink channel from the terminal device.
  • the CSI of the downlink channel includes information in the codebook structure of the codebook.
  • the wireless access network equipment constructs the codebook according to the information in the codebook structure of the codebook, determines the complete information related to the precoding matrix according to the delay information and angle information, and the codebook, and then combines other information reported by the terminal equipment.
  • Information eg, CQI, RI, LI, etc. above determines the complete CSI of the downlink channel.
  • the specific implementation process of the above steps 12) to 16) is based on the examples shown in (a) in FIG. 3, (b) in FIG. 3, (c) in FIG. 3 and (d) in FIG. 3 .
  • the implementation process includes:
  • Step 1 the dimension of the uplink channel matrix obtained by the wireless access network device is T*Y, where T is the number of rows of the uplink channel matrix, and Y is the number of columns of the uplink channel matrix. T is the number of antenna ports used by the radio access network device to receive the uplink reference signal, and Y is the number of subbands corresponding to the antenna port of the radio access network device to receive the uplink reference signal.
  • a box in the upstream channel matrix shown in (a) of FIG. 3 represents an element, and the value of each element is a complex number.
  • One element represents the amplitude and phase of the channel on one subband on one antenna port
  • the unfilled box in the uplink channel matrix shown in (a) in Figure 3 represents the channel corresponding to the element corresponding to the box
  • the energy of is smaller, and the filled box indicates that the energy of the channel corresponding to the element corresponding to the box is larger.
  • the wireless access network equipment performs delay angle estimation on the uplink channel matrix (or decomposes the antenna port and frequency domain) to obtain P angle delay pairs, where P is the number of ports used by the wireless access network equipment to send downlink reference signals. number.
  • the lower row reference signal is CSI-RS
  • the radio access network device determines P spatial-frequency domain vector pairs corresponding to the P angular delay pairs, and determines P CSI-RS weights according to the P spatial-frequency domain vector pairs, P The CSI-RS weights are in one-to-one correspondence with the P ports. Assuming that each port corresponds to N subbands, since the CSI-RS on each subband needs to be precoded, each CSI-RS weight includes N weights.
  • the CSI-RS of each port corresponds to a set of weights, and the set of weights includes the corresponding weights of the CSI-RS of the port on each subband.
  • "*" in this application means "multiplied by”. T, Y, P and N are all integers greater than or equal to 1.
  • the spatial-frequency-domain vector pair corresponding to an angle-delay pair consists of a spatial-domain vector corresponding to the angle information in the angle-delay pair and a frequency-domain vector corresponding to the time-delay information in the angle-delay pair.
  • the frequency domain vector and the spatial domain vector can be DFT vectors or other vectors.
  • Step 2 For the i-th port in the P ports, the radio access network device uses N weights in the i-th CSI-RS weight in the P CSI-RS weights to respectively apply the N weights on the N subbands.
  • the CSI-RS is precoded, and the precoded CSI-RS is sent to the terminal device.
  • i is an integer greater than 0 and less than or equal to P.
  • Step 3 The terminal device performs downlink channel measurement according to the received CSI-RS, and determines the information of the equivalent channels of the P ports.
  • the information of the equivalent channel of the ith port on the subband s can be expressed as: s is an integer greater than 0 and less than or equal to N.
  • Step 4 Based on the acquired information of the equivalent channels of the P ports, the terminal device determines the information in the codebook structure according to the relevant parameters of the codebook structure of the codebook, and sends the information to the wireless access network device.
  • codebook structure of the codebook W can be expressed as:
  • W 1 is a port selection matrix, the dimension is P*K 1 , and K 1 is the number of ports selected by the terminal device from the P ports.
  • the port selection matrix is a matrix composed of K 1 column vectors corresponding to K 1 ports selected by the terminal device from the P*P matrix. Each column vector in the P*P matrix corresponds to one of the P ports. Each column vector in W 1 corresponds to one of the K 1 ports, and W 1 is used to inform the radio access network device which ports are selected by the terminal device. Exemplarily, only one element of each column vector in W 1 may be 1, and the other elements may be 0. Each row in W 1 has at most 1 non-zero element, and the value of this non-zero element is 1. 1 ⁇ K 1 ⁇ P.
  • the ports selected by the device are the 1st port and the 3rd port.
  • W 2 is a complex coefficient matrix (also called a coefficient matrix or a combined coefficient matrix), the dimension is K 1 *M v , and W 2 includes at most K 0 non-zero elements, 1 ⁇ K 0 ⁇ K 1 *M v .
  • an element in W 2 may be an inner product of an equivalent channel of one port in K 1 ports and a frequency-domain vector (ie, a column vector) in the frequency-domain basis matrix.
  • W f is a frequency domain basis matrix (also called a frequency domain selection matrix), and the dimension is N*M v .
  • M v is the number of frequency domain vectors (ie, column vectors) contained in the frequency domain basis matrix.
  • the frequency domain vector in W f can be a DFT vector.
  • the DFT vector here includes N elements, the N elements correspond to the N subbands one-to-one, and the s-th element in the N elements is n is the index of the DFT vector, and n is an integer greater than or equal to 0 and less than N. is the conjugate transpose matrix of W f .
  • the element of the jth row and the kth column in the complex coefficient matrix may be the equivalent channel of the jth port in the K 1 ports and the kth frequency domain vector in the frequency domain basis matrix (that is, the kth frequency domain vector).
  • the inner product of the column vectors) represents the phase information and intensity information of the equivalent channel searched by the jth port within the delay range corresponding to the kth frequency domain vector.
  • j is an integer greater than 0 and less than or equal to K 1
  • k is an integer greater than 0 and less than or equal to M v .
  • the wireless access network device can obtain the delay information of the downlink channel, it can determine the delay range of the channel with the terminal device, and the delay range can be determined by N' frequency domains configured by the wireless access network device.
  • W 2 indicates the phase information and intensity information of the equivalent channel searched by the terminal device within the target delay range on each of the K 1 ports.
  • the target time delay range is the time delay range corresponding to the M v frequency domain vectors in the N' frequency domain vectors, that is, the time delay range corresponding to the M v frequency domain vectors in W f .
  • the relevant parameters of the codebook structure include K 1 , ⁇ and M v .
  • ⁇ is a compression factor, which is used to compress W 2 and control the feedback overhead of the terminal device, and ⁇ can be, for example, the proportion of non-zero elements in W 2 .
  • the setting of ⁇ is to prevent too many non-zero elements of W 2 , thereby increasing the feedback overhead of the terminal device. It should be noted that the terminal device needs to report one W 2 for each transport layer.
  • ⁇ ' refers to ⁇ when the number of transport layers is 1
  • 2* ⁇ ' refers to ⁇ when the number of transport layers is greater than 1.
  • Step 5 The wireless access network equipment constructs a codebook according to the information in the received codebook structure, determines the complete information related to the precoding matrix in combination with the delay information and the angle information, and then combines other information reported by the terminal equipment (such as , CQI, RI, LI, etc. above) determine the complete CSI of the downlink channel.
  • the above solution provides a codebook structure, but does not provide a configuration combination of relevant parameters of the codebook structure.
  • the version 16 (R16 for short) Type II port selection (Port selection) codebook structure in the existing 3rd Generation Partnership Project (3GPP) NR protocol can also be expressed as:
  • W 1 is the port selection matrix
  • the dimension is P*2L
  • W 1 can be expressed as Both A1 and A2 are matrices with P/2 rows and L columns
  • A1 represents the selection of L ports from P/2 ports in one polarization direction (for example, horizontal polarization)
  • A2 represents the other polarization direction ( For example, L ports are selected from P/2 ports on vertical polarization).
  • W f is the frequency domain basis matrix, including M v DFT vectors, and the dimension is N*M v .
  • W 2 is a complex coefficient matrix with dimension 2L*M v .
  • the PV in Table 1 is used to determine the value of M v , and a value of M v can be uniquely determined according to a PV .
  • the enhanced Type II codebook of R16 has a similar codebook structure and parameter configuration combination, which will not be repeated here.
  • the wireless access network device indicates index 2 in Table 1 for the terminal device
  • the terminal device can determine each polarization direction according to the index for port selection.
  • the number of ports is 2, PV is 1/8, and ⁇ is 1/2.
  • the terminal device can determine M v according to PV .
  • L in Table 1 is the number of ports used for port selection in each polarization direction
  • K 1 in Formula 1 is the number of ports used for port selection in all polarization directions.
  • the configuration of the relevant parameters of the codebook structure shown in Table 1 does not take into account the partial reciprocity of FDD.
  • the delay range can be indicated by N' frequency domain vectors configured by the wireless access network device.
  • the value of M v may be small, for example, may be 1 or 2.
  • the feedback overhead of the terminal device can be adjusted by adjusting the number of non-zero elements in W 2 .
  • W 2 in M v is an integer greater than 0, and ⁇ is a natural number greater than 0 and less than or equal to 1.
  • M v has a greater impact on the adjustment efficiency of the number of non-zero elements in W 2 . Therefore, the number of elements in W 2 can be preliminarily controlled by M v , and then the number of non-zero elements in W 2 can be controlled more precisely by ⁇ .
  • the value of PV is strongly correlated with V (that is, the number of transmission layers), and PV is used to determine Mv .
  • V and Mv are bound, and the value of Mv is more, so , by binding V and M v , the flexibility of adjusting the number of non-zero elements in W 2 can be well controlled under different numbers of transport layers.
  • the configuration of the relevant parameters of the codebook structure shown in Table 1 is also used in the FDD system, since the value of M v is very small, it cannot be well controlled by M v under different numbers of transmission layers. Flexibility to adjust the number of non-zero elements.
  • V is no longer bound to Mv, but is bound to ⁇ . Since ⁇ has many values, the flexibility of adjusting the number of non-zero elements in W 2 can be improved.
  • the present application provides an information transmission method as shown in FIG. 4B and FIG. 6 .
  • an information transmission method provided by the present application includes:
  • the wireless access network device sends the first indication information and the second indication information to the terminal device.
  • the terminal device receives the first indication information and the second indication information from the wireless access network device.
  • the first indication information is used to indicate the first information and the second information.
  • the first information is used to indicate the first selection port number, the first selection port number is one of at least one selection port number, and the selection port number is the number of possible ports used by the terminal device for port selection (that is, K 1 in the above). or K 1 /2).
  • the second information is used to indicate a first compression factor, the first compression factor is one of at least one compression factor, and the compression factor is a possible compression factor (ie, ⁇ in the above) in the complex coefficient matrix (i.e., W 2 in the above).
  • the possible number of transmission layers corresponding to the downlink channel state information reported by the network device may be the number of transmission layers corresponding to the codebook, and the number of transmission layers may be determined by the terminal device. For example, the terminal device determines the rates corresponding to multiple transmission layers, determines the number of transmission layers with the highest rate as the number of transmission layers corresponding to the codebook, and after determining the number of transmission layers corresponding to the codebook, for each transmission layer, the terminal device A complex coefficient matrix needs to be reported.
  • the multiple transmission layer numbers may be indicated to the terminal device by the wireless access network device, or may be determined by the terminal device itself, which is not limited in this application.
  • the method for the terminal device to determine the number of transmission layers corresponding to the codebook may also be other, which is not limited in this application.
  • the second indication information is used to indicate the number of the first DFT vectors, the number of the first DFT vectors is one of the numbers of at least one DFT vector, and the number of DFT vectors is included in the frequency domain basis matrix (ie, W f above)
  • the number of possible DFT vectors ie M v in the above, since the number of DFT vectors in the above is related to V, but not related to V in this application, therefore, the number is denoted as M in this application).
  • the first information may be the number of the first selected ports, or may be the number of the first selected ports and the number of the first transmission ports (the number of the first transmission ports is the number of transmission reference signals indicated by the wireless access network device for the terminal device). If it is the latter, since the total port number P can be known by the terminal device, the first selected port number can be determined according to the ratio and the total port number P.
  • the number of selected ports may be the number of ports used by the terminal equipment for port selection in all polarization directions (in this case, the first selected port number is used to indicate K 1 ), or it may be the number of ports used by the terminal equipment in each polarization direction The number of ports used for port selection (at this time, the first selected port number is used to indicate K 1 /2).
  • the polarization direction refers to the polarization direction of the antenna of the wireless access network device, including horizontal polarization and vertical polarization.
  • a radio access network device transmits CSI-RS using horizontal polarization or vertical polarization on one port. For example, if the radio access network device transmits the CSI-RS on 32 ports in total, the first information may be the number of ports selected by the terminal device among the 32 ports.
  • the wireless access network equipment transmits CSI-RS on a total of 32 ports, among which, the CSI-RS is transmitted in polarization direction 1 on 16 ports, and the CSI-RS is transmitted in polarization direction 2 on the other 16 ports.
  • the first information may be the number of ports selected by the terminal device among the 16 ports. It should be noted that the number of ports selected by the terminal device in different polarization directions can be the same. For example, the first 5 ports are selected for the 16 ports corresponding to the polarization direction 1, and the first 5 ports are also selected for the 16 ports corresponding to the polarization direction 2. The first 5 ports. The number of ports selected by the terminal device in different polarization directions can also be different.
  • the first 5 ports are selected for the 16 ports corresponding to the polarization direction 1, and the last 5 ports are selected for the 16 ports corresponding to the polarization direction 2.
  • the polarization direction 1 is horizontal polarization
  • the polarization direction 2 is vertical polarization
  • the polarization direction 1 is vertical polarization
  • the polarization direction 2 is horizontal polarization.
  • the second information may be a compression factor in the complex coefficient matrix.
  • the compression factor may be the ratio of non-zero elements, or may be the number of non-zero elements in the complex coefficient matrix reported by all transport layers. If it is the latter, the terminal device may determine the non-zero elements in the complex coefficient matrix according to the number of non-zero elements in the complex coefficient matrix reported by all transport layers and the total number of elements in the complex coefficient matrix reported by a single transport layer proportion.
  • the terminal device may also not calculate the ratio of the non-zero elements in the complex coefficient matrix, directly according to the first
  • the second information determines the number of non-zero elements in the complex coefficient matrix reported by all transport layers.
  • the following description in the present application takes the ratio of ⁇ V ' as a non-zero element as an example.
  • the complex coefficient matrix is used to indicate the phase information and intensity information of the equivalent channel searched by the terminal device within the target delay range on each of the K 1 ports selected by the terminal device.
  • the frequency domain basis matrix is used to indicate the target delay range.
  • the target delay range is the delay range corresponding to the M frequency domain vectors in the frequency domain basis matrix.
  • the complex coefficient matrix is determined according to the port selected by the terminal equipment and the frequency domain basis matrix. Specifically, the complex coefficient matrix is determined according to the equivalent channel of the port selected by the terminal device and the basis matrix in the frequency domain.
  • the element of the jth row and the kth column in the complex coefficient matrix may be the jth element in the K 1 ports.
  • j is an integer greater than 0 and less than or equal to K 1
  • k is an integer greater than 0 and less than or equal to M.
  • M v involved in the above formula 1 can be replaced by M, and the involved ⁇ can be replaced by ⁇ V for understanding.
  • the radio access network device sends a reference signal to the terminal device.
  • the terminal device receives the reference signal from the radio access network device.
  • the reference signal is a downlink reference signal.
  • the reference signal may be CSI-RS or other reference signals that may be used to implement the solution of the present application.
  • the radio access network device may load the time delay information and angle information estimated according to the uplink channel matrix to the downlink reference signal.
  • the terminal device sends downlink channel state information to the radio access network device according to the first indication information, the second indication information and the reference signal.
  • the radio access network device receives the downlink channel state information from the terminal device.
  • the downlink channel state information may include W 1 , W 2 and Information such as CQI, RI, and LI may also be included.
  • the radio access network device determines a precoding matrix according to the downlink channel state information.
  • the radio access network device may obtain the estimated delay information and angle information and the received W 1 , W 2 and The complete information related to the precoding matrix is determined, thereby determining the precoding matrix.
  • the radio access network device precodes the data according to the precoding matrix.
  • the number of transmission layers is no longer bound to the number of DFT vectors, but is bound to the compression factor. Since the compression factor has many values, it can be solved that the number of DFT vectors is less. In the case of , the configuration of the relevant parameters of the existing codebook structure cannot satisfy the problem of flexibly adjusting the number of non-zero elements in the complex coefficient matrix.
  • first indication information and second indication information may be implemented in the following manner 1 or manner 2.
  • Manner 1 The first indication information and the second indication information are implemented separately.
  • the first indication information is implemented by the first index in the first table (that is, the first indication information is the first index), and the first table includes the correspondence between at least one selection port number and at least one compression factor relationship, the first index is used to indicate the first selected port number and the first compression factor; wherein, the compression factors corresponding to different transmission layer numbers are the same; or, the compression corresponding to at least two transmission layer numbers in different transmission layer numbers The scale of the factors is different.
  • the first table may not reflect the information of the number of transmission layers, such as Table 2.
  • the information of the number of transmission layers may also be reflected, which is not limited in this application.
  • the compression factors corresponding to at least two of the different transmission layers are different, the compression factors corresponding to only part of the transmission layers may be different, such as Table 3, or the compression factors corresponding to all the transmission layers may be different. , such as Table 4.
  • the first indication information is index 1
  • the number of transport layers is 2
  • the second column in Table 3 is K 1
  • the number of the first selected ports indicated by the first indication information is 8
  • the A compression factor is 0.75.
  • the second indication information is further used to indicate the number of the first sending port, the first sending port number is one of the at least one sending port number, and the sending port number is the possible ports through which the radio access network device sends the reference signal number (ie P above).
  • the second indication information is implemented by a second index in the second table, the second table includes the correspondence between the number of at least one sending port and the number of at least one DFT vector, and the second index is used to indicate the first Number of transmit ports and number of first DFT vectors. See Table 5 for a possible second table.
  • the second indication information is index 1
  • the number of first transmission ports is 24, and the number of first DFT vectors is 1.
  • the radio access network device can limit the combination of M and P, and limit M ⁇ 2 only for the case where the number of ports is small, so as to control the feedback overhead of the terminal device.
  • the number of the first sending ports and the number of the first DFT vectors may also be indicated respectively, which are not limited in this application.
  • the method further includes: the wireless access network device sends second configuration information to the terminal device, and the second configuration information is used for Configure the second table.
  • the terminal device receives the second configuration information from the wireless access network device, and determines the second table according to the second configuration information.
  • Manner 2 The first indication information and the second indication information are jointly implemented.
  • the first indication information and the second indication information are implemented by the first index in the first table, and the first table includes the number of at least one DFT vector, the number of at least one selection port, and the at least one compression factor.
  • the first index is used to indicate the number of the first DFT vectors, the number of the first selected ports and the first compression factor; wherein, the compression factors corresponding to different numbers of transmission layers are the same; or, at least one of the numbers of different transmission layers The ratios of the compression factors corresponding to the two transmission layers are different.
  • the wireless access network device sends the first index to the terminal device, where the first index indicates both the information indicated by the first indication information and the information indicated by the second indication information.
  • the first table may not reflect the information of the number of transmission layers, such as Table 6, of course, it may also reflect the information of the number of transmission layers, which is not limited in this application. If the compression factors corresponding to at least two of the different transmission layers are different, the compression factors corresponding to only some of the transmission layers may be different, such as Table 7, or the compression factors corresponding to all the transmission layers may be different. , such as Table 8.
  • the wireless access network device may indicate P for the terminal device alone.
  • the first table may be directly configured in the terminal device, or may be configured to the terminal device by the wireless access network device. If it is the latter, the method further includes: the wireless access network device sends first configuration information to the terminal device, where the first configuration information is used to configure the first table.
  • the terminal device receives the first configuration information from the wireless access network device, and determines the first table according to the first configuration information.
  • the first table in this application may also be referred to as a codebook structure parameter configuration combination table.
  • the above-mentioned first configuration information and/or second configuration information may be carried in an RRC message.
  • the information in M is not included in the first table, in the case where the first table is directly configured in the terminal device, compared with Table 1, the information in the first table is less, therefore, the storage resources occupied less information, saving the storage resources of the terminal device; in the case that the first table is configured to the terminal device by the wireless access network device, compared with Table 1, the information in the first table is less, therefore, the transmission resources are saved.
  • the number of DFT vectors (ie, M) is 1 or 2.
  • N' M.
  • FIG. 6 another information transmission method provided by this application includes:
  • the wireless access network device sends the second indication information and the third indication information to the terminal device.
  • the terminal device receives the second indication information and the third indication information from the wireless access network device.
  • the second indication information is used to indicate the number of the first DFT vectors
  • the number of the first DFT vectors is one of the numbers of at least one DFT vector
  • the number of DFT vectors is the number of possible DFT vectors included in the frequency domain basis matrix number.
  • the third indication information is used to indicate the first compression factor.
  • the first compression factor is one of at least one compression factor
  • the compression factor is a possible compression factor of the complex coefficient matrix.
  • the complex coefficient matrix is based on the port and frequency domain selected by the terminal device. Determined by the basis matrix, the compression factor has a corresponding relationship with the number of transmission layers, and the number of transmission layers refers to the possible number of transmission layers corresponding to the downlink channel state information reported by the terminal device to the wireless access network device.
  • the number of selected ports is a preset value
  • the number of selected ports is the number of ports used for port selection when the terminal device sends downlink channel status information to the wireless access network device (it can be the number of ports used by the terminal device in all polarization directions).
  • the preset value may be P (in this case, the number of ports used by the terminal device for port selection is the number of ports used by the terminal device for port selection in all polarization directions), P/2, P/4 , P/8 or other values, which are not limited in this application.
  • the number of DFT vectors (ie, M) is 1.
  • the feedback overhead of the terminal device can be adjusted by adjusting the number of non-zero elements in W 2 .
  • W 2 in In the case of M 2, the number of elements in W 2 can be preliminarily controlled by K 1 , and then the number of non-zero elements in W 2 can be controlled more precisely by ⁇ V .
  • K 1 changes (increases or decreases) by X the number of elements in W 2 changes (increases or decreases) by 2X.
  • K 1 changes (increases or decreases) by X
  • 2X changes (increases or decreases) by 2X.
  • the number of non-zero elements in W 2 can be greatly changed.
  • the number of non-zero elements in W 2 is performed by ⁇ V. More precise control can be a good balance of configuration flexibility and overhead.
  • K 1 can be set as a preset value, and the feedback overhead of the terminal device can be controlled by adjusting the compression factor.
  • the information of K 1 may not be included in the first table.
  • the information in the first table is less, therefore, it occupies less storage resources and saves the storage resources of the terminal device; the first table is configured by the wireless access network device to the terminal In the case of a device, there is less information in the first table, thus saving transmission resources.
  • the third indication information and the second indication information can be implemented separately.
  • the third indication information can be an index in the first table.
  • the first table (For example, Table 2, Table 3, or Table 4) does not include information on the number of selected ports (ie, does not include information on K 1 or K 1 /2).
  • the third indication information and the second indication information can also be implemented together.
  • the third indication information and the second indication information can be indexes in the first table.
  • the first table eg, Table 6, Table 7, or Table 8
  • the specifics can be understood according to the first manner and the second manner in the embodiment shown in FIG. 4B , and details are not repeated here.
  • the radio access network device sends a reference signal to the terminal device.
  • the terminal device receives the reference signal from the radio access network device.
  • step 602 reference may be made to the above-mentioned step 402, and details are not repeated here.
  • the terminal device sends the downlink channel state information to the radio access network device according to the second indication information, the third indication information and the reference signal.
  • the radio access network device receives the downlink channel state information from the terminal device.
  • the downlink channel state information may include W 1 , W 2 and Information such as CQI, RI, and LI may also be included.
  • the radio access network device determines a precoding matrix according to the downlink channel state information.
  • step 604 For the related description of step 604, reference may be made to the above-mentioned step 404, and details are not repeated here.
  • the radio access network device precodes the data according to the precoding matrix.
  • the second indication information is further used to indicate the number of first sending ports, where the first sending port number is one of at least one sending port number, and the sending port number is the possible number of ports through which the radio access network device sends the reference signal .
  • the first sending port number is one of at least one sending port number
  • the sending port number is the possible number of ports through which the radio access network device sends the reference signal .
  • the second indication information is implemented by a second index in the second table, the second table includes the correspondence between the number of at least one sending port and the number of at least one DFT vector, and the second index is used to indicate the first Number of transmit ports and number of first DFT vectors.
  • the second index is used to indicate the first Number of transmit ports and number of first DFT vectors.
  • the method further includes: the wireless access network device sends second configuration information to the terminal device, where the second configuration information is used to configure the second table.
  • the terminal device receives the second configuration information from the wireless access network device.
  • the third indication information may also indicate the number of the first selected ports.
  • the number of DFT vectors ie, M
  • M the number of DFT vectors
  • the feedback overhead of the terminal device can also be controlled only by adjusting the number of selected ports.
  • the compression factor can be determined as is the default value.
  • the information of ⁇ V may not be included in the first table. In the case where the first table is directly configured in the terminal device, there is less information in the first table. Therefore, it occupies less storage resources and saves money. Storage resources of the terminal device; in the case that the first table is configured by the radio access network device to the terminal device, there is less information in the first table, so transmission resources are saved.
  • the number of transmission layers is no longer bound to the number of DFT vectors, but is bound to the compression factor. Since the compression factor has many values, it can be solved that the number of DFT vectors is less. In the case of , the configuration of the relevant parameters of the existing codebook structure cannot satisfy the problem of flexibly adjusting the number of non-zero elements in the complex coefficient matrix.
  • the above Tables 2 to 8 are only examples of the first table and the second table in the embodiment of the present application. In actual implementation, the values in the first table and the second table may be other. The specific value may be specified by the protocol, or pre-configured, or configured by the wireless access network device, or determined through negotiation between the wireless access network device and the terminal device, which is not limited in this application.
  • the ⁇ V in the above Tables 2 to 4 and Tables 6 to 8 are all exemplified by the ratio of non-zero elements.
  • each network element for example, a wireless access network device and a terminal device, includes at least one of a hardware structure and a software module corresponding to each function in order to implement the above-mentioned functions.
  • a hardware structure for example, a wireless access network device and a terminal device
  • a software module corresponding to each function in order to implement the above-mentioned functions.
  • the present application can be implemented in hardware or a combination of hardware and computer software with the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein. Whether a function is performed by hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of this application.
  • the wireless access network device and the terminal device may be divided into functional units according to the foregoing method examples.
  • each functional unit may be divided corresponding to each function, or two or more functions may be integrated into one processing unit. in the unit.
  • the above-mentioned integrated units may be implemented in the form of hardware, or may be implemented in the form of software functional units. It should be noted that the division of units in the embodiments of the present application is illustrative, and is only a logical function division, and other division methods may be used in actual implementation.
  • FIG. 7 shows a possible schematic structural diagram of the communication device (referred to as the communication device 70 ) involved in the above embodiment, and the communication device 70 includes a processing unit 701 and a communication unit 702 . Optionally, a storage unit 703 is also included.
  • the communication apparatus 70 may be used to illustrate the structures of the terminal equipment and the wireless access network equipment in the foregoing embodiments.
  • the processing unit 701 is used to control and manage the actions of the terminal device.
  • the processing unit 701 is used to execute the operation of the 401 to 403, 601 to 603 in FIG. 6, and/or actions performed by the terminal device in other processes described in the embodiments of this application.
  • the processing unit 701 may communicate with other network entities through the communication unit 702, for example, with the radio access network device in FIG. 4B.
  • the storage unit 703 is used to store program codes and data of the terminal device.
  • the processing unit 701 is used to control and manage the actions of the wireless access network equipment.
  • the processing unit 701 uses Actions performed by the radio access network device during execution of 401 to 405 in FIG. 4B , 601 to 605 in FIG. 6 , and/or other processes described in the embodiments of this application.
  • the processing unit 701 may communicate with other network entities through the communication unit 702, for example, with the terminal device in FIG. 4B.
  • the storage unit 703 is used for storing program codes and data of the wireless access network device.
  • the communication apparatus 70 may be a device or a chip or a chip system.
  • the processing unit 701 may be a processor; the communication unit 702 may be a communication interface, a transceiver, or an input interface and/or an output interface.
  • the transceiver may be a transceiver circuit.
  • the input interface may be an input circuit, and the output interface may be an output circuit.
  • the communication unit 702 may be a communication interface, input interface and/or output interface, interface circuit, output circuit, input circuit, pin or related circuit, etc. on the chip or chip system.
  • the processing unit 701 may be a processor, a processing circuit, a logic circuit, or the like.
  • the integrated units in FIG. 7 may be stored in a computer-readable storage medium if implemented in the form of software functional modules and sold or used as independent products.
  • the medium includes several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (processor) to execute all or part of the steps of the methods described in the various embodiments of the present application.
  • Storage media for storing computer software products include: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), magnetic disk or CD, etc. that can store program codes medium.
  • An embodiment of the present application further provides a schematic diagram of a hardware structure of a communication apparatus, see FIG. 8 or FIG. 9 , the communication apparatus includes a processor 801 , and optionally, a memory 802 connected to the processor 801 .
  • the processor 801 can be a general-purpose central processing unit (central processing unit, CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more processors for controlling the execution of the programs of the present application. integrated circuit.
  • the processor 801 may also include multiple CPUs, and the processor 801 may be a single-core (single-CPU) processor or a multi-core (multi-CPU) processor.
  • a processor herein may refer to one or more devices, circuits, or processing cores for processing data (eg, computer program instructions).
  • the memory 802 can be a ROM or other types of static storage devices that can store static information and instructions, a RAM or other types of dynamic storage devices that can store information and instructions, or an electrically erasable programmable read-only memory.
  • read-only memory EEPROM
  • CD-ROM compact disc read-only memory
  • optical disc storage including compact disc, laser disc, optical disc, digital versatile disc, Blu-ray disc, etc.
  • magnetic disk A storage medium or other magnetic storage device, or any other medium that can be used to carry or store desired program codes in the form of instructions or data structures and that can be accessed by a computer, is not limited in this embodiment of the present application.
  • the memory 802 may exist independently (in this case, the memory 802 may be located outside the communication device, or may be located in the communication device), or may be integrated with the processor 801. Among them, the memory 802 may contain computer program code.
  • the processor 801 is configured to execute the computer program codes stored in the memory 802, so as to implement the methods provided by the embodiments of the present application.
  • the communication apparatus further includes a transceiver 803 .
  • the processor 801, the memory 802 and the transceiver 803 are connected by a bus.
  • the transceiver 803 is used to communicate with other devices or communication networks.
  • the transceiver 803 may include a transmitter and a receiver.
  • a device in the transceiver 803 for implementing the receiving function may be regarded as a receiver, and the receiver is configured to perform the receiving steps in the embodiments of the present application.
  • the device in the transceiver 803 for implementing the sending function may be regarded as a transmitter, and the transmitter is used to perform the sending step in the embodiment of the present application.
  • FIG. 8 may be used to illustrate the structures of the terminal device and the radio access network device involved in the foregoing embodiment.
  • the processor 801 is used to control and manage the actions of the terminal device, for example, the processor 801 is used to execute the 401 to 403, 601 to 603 in FIG. 6, and/or actions performed by the terminal device in other processes described in the embodiments of this application.
  • the processor 801 may communicate with other network entities through the transceiver 803, eg, with the radio access network device in FIG. 4B.
  • the memory 802 is used to store program codes and data of the terminal device.
  • the processor 801 is used to control and manage the actions of the wireless access network equipment.
  • the processor 801 uses Actions performed by the radio access network device during execution of 401 to 405 in FIG. 4B , 601 to 605 in FIG. 6 , and/or other processes described in the embodiments of this application.
  • the processor 801 may communicate with other network entities through the transceiver 803, for example, with the terminal device in FIG. 4B.
  • the memory 802 is used to store program codes and data of the wireless access network device.
  • the processor 801 includes a logic circuit and an input interface and/or an output interface.
  • the output interface is used for performing the sending action in the corresponding method
  • the input interface is used for performing the receiving action in the corresponding method.
  • FIG. 9 the schematic structural diagram shown in FIG. 9 may be used to illustrate the structures of the terminal equipment and the radio access network equipment involved in the foregoing embodiments.
  • the processor 801 is used to control and manage the actions of the terminal device, for example, the processor 801 is used to execute the 401 to 403, 601 to 603 in FIG. 6, and/or actions performed by the terminal device in other processes described in the embodiments of this application.
  • the processor 801 may communicate with other network entities, eg, with the radio access network device in FIG. 4B, through the input interface and/or the output interface.
  • the memory 802 is used to store program codes and data of the terminal device.
  • the processor 801 is used to control and manage the actions of the wireless access network equipment.
  • the processor 801 uses Actions performed by the radio access network device during execution of 401 to 405 in FIG. 4B , 601 to 605 in FIG. 6 , and/or other processes described in the embodiments of this application.
  • the processor 801 may communicate with other network entities, eg, with the terminal device in FIG. 4B, through the input interface and/or the output interface.
  • the memory 802 is used to store program codes and data of the wireless access network device.
  • each step in the method provided in this embodiment may be completed by an integrated logic circuit of hardware in a processor or an instruction in the form of software.
  • the steps of the methods disclosed in conjunction with the embodiments of the present application may be directly embodied as executed by a hardware processor, or executed by a combination of hardware and software modules in the processor.
  • Embodiments of the present application further provide a computer-readable storage medium, including computer-executable instructions, which, when executed on the computer, cause the computer to execute any of the foregoing methods.
  • the embodiments of the present application also provide a computer program product comprising computer-executed instructions, which, when running on the computer, causes the computer to execute any of the above methods.
  • the embodiment of the present application also provides a communication system, including: a terminal device and a wireless access network device.
  • the embodiment of the present application also provides a chip, including: a processor and an interface, the processor is coupled to the memory through the interface, and when the processor executes the computer program in the memory or the computer executes the instructions, any one of the above-mentioned embodiments method is executed.
  • the above-mentioned embodiments it may be implemented in whole or in part by software, hardware, firmware or any combination thereof.
  • a software program it can be implemented in whole or in part in the form of a computer program product.
  • the computer program product includes one or more computer-implemented instructions. When the computer-executed instructions are loaded and executed on the computer, all or part of the processes or functions described in the embodiments of the present application are generated.
  • the computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable device.
  • Computer-executable instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer-executable instructions may be transferred from a website site, computer, server, or data center over a wired connection.
  • a website site computer, server, or data center over a wired connection.
  • DSL digital subscriber line
  • wireless eg infrared, wireless, microwave, etc.
  • Computer-readable storage media can be any available media that can be accessed by a computer or data storage devices including one or more servers, data centers, etc., that can be integrated with the media.
  • Useful media may be magnetic media (eg, floppy disks, hard disks, magnetic tapes), optical media (eg, DVDs), or semiconductor media (eg, solid state disks (SSDs)), and the like.

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Abstract

本申请提供了一种信息传输方法及装置，涉及通信技术领域。该方法中，无线接入网设备向终端设备发送用于指示第一信息和第二信息的第一指示信息和用于指示第一DFT向量个数的第二指示信息，第一信息用于指示第一选择端口数，第二信息用于指示第一压缩因子，无线接入网设备还向终端设备发送参考信号，终端设备根据第一指示信息、第二指示信息和参考信号向无线接入网设备发送下行信道状态信息。其中，压缩因子为复系数矩阵的压缩因子，压缩因子与传输层数有对应关系，通过将传输层数与取值较多的压缩因子绑定，可以解决DFT向量个数取值较少的情况下，现有的码本结构的相关参数的配置无法满足灵活的调整复系数矩阵中的非零元素个数的问题。

Description

信息传输方法及装置
本申请要求于2021年04月06日提交国家知识产权局、申请号为202110368766.5、申请名称为“信息传输方法及装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信技术领域，尤其涉及一种信息传输方法及装置。
背景技术
为了提高系统的频谱效率，大规模(massive)多输入多输出(multi-input multi-output，MIMO)技术得到了广泛的应用。采用大规模MIMO技术时，无线接入网设备向终端设备发送数据前，需要对数据进行预编码。在对数据进行预编码之前，无线接入网设备需要根据终端设备向无线接入网设备反馈的下行信道的信道状态信息(channel state information，CSI)确定进行预编码的预编码矩阵。
对于时分复用(time division duplexing，TDD)系统，由于上行信道与下行信道采用相同的频段，因此，可利用信道的互易性，通过上行信道来获取下行信道的CSI，进而确定预编码矩阵。而对于频分复用(frequency division duplexing，FDD)系统来说，由于上下行频带间的间隔大于上行带宽或下行带宽，故上下行信道之间不具有完整的互易性，而具有部分互易性。然而，目前针对预编码的码本结构的参数配置没有考虑到FDD的部分互易性，不够灵活。
发明内容
本申请提供了一种信息传输方法及装置，用于解决FDD系统中，码本结构的参数配置不够灵活的问题。
为达到上述目的，本申请实施例提供如下技术方案：
第一方面，提供了一种信息传输方法，包括：终端设备接收来自于无线接入网设备的第一指示信息和第二指示信息，还接收来自于无线接入网设备的参考信号，根据第一指示信息、第二指示信息和参考信号向无线接入网设备发送下行信道状态信息。其中，第一指示信息用于指示第一信息和第二信息，第二指示信息用于指示第一DFT向量个数，第一DFT向量个数为至少一个DFT向量个数中的一个，DFT向量个数为频域基底矩阵包括的可能的DFT向量的个数，第一信息用于指示第一选择端口数，第一选择端口数为至少一个选择端口数中的一个，选择端口数为终端设备用于进行端口选择的可能的端口数，第二信息用于指示第一压缩因子，第一压缩因子为至少一个压缩因子中的一个，压缩因子为复系数矩阵的可能的压缩因子，复系数矩阵是根据终端设备选择的端口和频域基底矩阵确定的，压缩因子与传输层数有对应关系，传输层数是指终端设备向无线接入网设备上报的下行信道状态信息对应的可能的传输层数。第一方面提供的方法，传输层数不再与DFT向量个数绑定，而是与压缩因子绑定，由于压缩因子的取值较多，因此，可以解决DFT向量个数取值较少的情况下，现有的码本结构的相关参数的配置无法满足灵活的调整复系数矩阵中的非零元素个数的问题。
在一种可能的实现方式中，选择端口数为每个极化方向上终端设备用于进行端口选择的端口数。该种可能的实现方式，终端设备可以确定每个极化方向上需要选择的端口数。
在一种可能的实现方式中，第一指示信息通过第一表格中的第一索引实现，第一表格中包括至少一个选择端口数与至少一个压缩因子之间的对应关系，第一索引用于指示第一选择端口数和第一压缩因子；其中，不同的传输层数对应的压缩因子相同；或者，不同的传输层数中的至少两个传输层数对应的压缩因子不同。该种可能的实现方式，无线接入网设备通过第一索引指示第一选择端口数和第一压缩因子，相比直接指示第一选择端口数和第一压缩因子，可以降低信令开销。
在一种可能的实现方式中，第二指示信息还用于指示第一发送端口数，第一发送端口数为至少一个发送端口数中的一个，发送端口数为无线接入网设备发送参考信号的可能的端口数。该种可能的实现方式，第一发送端口数和第一DFT向量个数可以同时指示给终端设备，可以降低信令开销。
在一种可能的实现方式中，第二指示信息通过第二表格中的第二索引实现，第二表格中包括至少一个发送端口数与至少一个DFT向量个数之间的对应关系，第二索引用于指示第一发送端口数和第一DFT向量个数。该种可能的实现方式，无线接入网设备通过第二索引指示第一发送端口数和第一DFT向量个数，相比直接指示第一发送端口数和第一DFT向量个数，可以降低信令开销。
在一种可能的实现方式中，该方法还包括：终端设备接收来自于无线接入网设备的第二配置信息，第二配置信息用于配置第二表格。该种可能的实现方式，可以使得终端设备确定第二表格，以便在无线接入网设备指示第二表格中的索引时，终端设备可以根据该索引确定发送端口数和DFT向量个数。
在一种可能的实现方式中，第一指示信息和第二指示信息通过第一表格中的第一索引实现，第一表格中包括至少一个DFT向量个数、至少一个选择端口数和至少一个压缩因子之间的对应关系，第一索引用于指示第一DFT向量个数、第一选择端口数和第一压缩因子；其中，不同的传输层数对应的压缩因子相同；或者，不同的传输层数中的至少两个传输层数对应的压缩因子不同。该种可能的实现方式，无线接入网设备通过第一索引指示第一选择端口数、第一压缩因子和第一DFT向量个数，相比直接指示第一选择端口数、第一压缩因子和第一DFT向量个数，可以降低信令开销。
在一种可能的实现方式中，该方法还包括：终端设备接收来自于无线接入网设备的第一配置信息，第一配置信息用于配置第一表格。该种可能的实现方式，可以使得终端设备确定第一表格，以便在无线接入网设备指示第一表格中的索引时，终端设备可以根据该索引确定选择端口数、压缩因子和DFT向量个数中的一个或多个。
在一种可能的实现方式中，DFT向量个数为1或2。
第二方面，提供了一种信息传输方法，包括：无线接入网设备向终端设备发送用于指示第一信息和第二信息的第一指示信息和用于指示第一DFT向量个数的第二指示信息，并向终端设备发送参考信号。其中，第一指示信息、第二指示信息和参考信号用于终端设备确定下行信道状态信息。第一DFT向量个数为至少一个DFT向量个数中的一个，DFT向量个数为频域基底矩阵包括的可能的DFT向量的个数，第一信息用于指示第一选择端口数，第一选择端口数为至少一个选择端口数中的一个，选择端口数为终端设备用于进行端口选择的可能的端口数，第二信息用于指示第一压缩因子，第一压缩因子为至少一个压缩因子中的一个，压缩因子为复系数矩阵的可能的压缩因子，复系数矩阵是根据终端设备选择的端口和频域基底矩阵确定的，压缩因子与传输层数有对应关系，传输层数是指终端设备向无线接入网设备上报的下行信道状态信息对应的可能的传输层数。第二方面提供的方法，传输层数不再与DFT 向量个数绑定，而是与压缩因子绑定，由于压缩因子的取值较多，因此，可以解决DFT向量个数取值较少的情况下，现有的码本结构的相关参数的配置无法满足灵活的调整复系数矩阵中的非零元素个数的问题。
在一种可能的实现方式中，该方法还包括：无线接入网设备接收来自于终端设备的下行信道状态信息；无线接入网设备根据下行信道状态信息确定预编码矩阵；无线接入网设备根据预编码矩阵对数据进行预编码。
在一种可能的实现方式中，选择端口数为每个极化方向上终端设备用于进行端口选择的端口数。该种可能的实现方式，终端设备可以确定每个极化方向上需要选择的端口数。
在一种可能的实现方式中，第一指示信息通过第一表格中的第一索引实现，第一表格中包括至少一个选择端口数与至少一个压缩因子之间的对应关系，第一索引用于指示第一选择端口数和第一压缩因子；其中，不同的传输层数对应的压缩因子相同；或者，不同的传输层数中的至少两个传输层数对应的压缩因子不同。该种可能的实现方式，无线接入网设备通过第一索引指示第一选择端口数和第一压缩因子，相比直接指示第一选择端口数和第一压缩因子，可以降低信令开销。
在一种可能的实现方式中，第二指示信息还用于指示第一发送端口数，第一发送端口数为至少一个发送端口数中的一个，发送端口数为无线接入网设备发送参考信号的可能的端口数。该种可能的实现方式，第一发送端口数和第一DFT向量个数可以同时指示给终端设备，可以降低信令开销。
在一种可能的实现方式中，第二指示信息通过第二表格中的第二索引实现，第二表格中包括至少一个发送端口数与至少一个DFT向量个数之间的对应关系，第二索引用于指示第一发送端口数和第一DFT向量个数。该种可能的实现方式，无线接入网设备通过第二索引指示第一发送端口数和第一DFT向量个数，相比直接指示第一发送端口数和第一DFT向量个数，可以降低信令开销。
在一种可能的实现方式中，该方法还包括：无线接入网设备向终端设备发送第二配置信息，第二配置信息用于配置第二表格。该种可能的实现方式，可以使得终端设备确定第二表格，以便在无线接入网设备指示第二表格中的索引时，终端设备可以根据该索引确定发送端口数和DFT向量个数。
在一种可能的实现方式中，第一指示信息和第二指示信息通过第一表格中的第一索引实现，第一表格中包括至少一个DFT向量个数、至少一个选择端口数和至少一个压缩因子之间的对应关系，第一索引用于指示第一DFT向量个数、第一选择端口数和第一压缩因子；其中，不同的传输层数对应的压缩因子相同；或者，不同的传输层数中的至少两个传输层数对应的压缩因子不同。该种可能的实现方式，无线接入网设备通过第一索引指示第一选择端口数、第一压缩因子和第一DFT向量个数，相比直接指示第一选择端口数、第一压缩因子和第一DFT向量个数，可以降低信令开销。
在一种可能的实现方式中，该方法还包括：无线接入网设备向终端设备发送第一配置信息，第一配置信息用于配置第一表格。该种可能的实现方式，可以使得终端设备确定第一表格，以便在无线接入网设备指示第一表格中的索引时，终端设备可以根据该索引确定选择端口数、压缩因子和DFT向量个数中的一个或多个。
在一种可能的实现方式中，DFT向量个数为1或2。
第三方面，提供了一种信息传输方法，其特征在于，包括：终端设备接收来自于无线接入网设备的第二指示信息和第三指示信息，所述第二指示信息用于指示第一DFT向量个数， 所述第一DFT向量个数为至少一个DFT向量个数中的一个，所述DFT向量个数为频域基底矩阵包括的可能的DFT向量的个数，所述第三指示信息用于指示第一压缩因子，所述第一压缩因子为至少一个压缩因子中的一个，所述压缩因子为复系数矩阵的可能的压缩因子，所述复系数矩阵是根据所述终端设备选择的端口和所述频域基底矩阵确定的，所述压缩因子与传输层数有对应关系，所述传输层数是指所述终端设备向所述无线接入网设备上报的下行信道状态信息对应的可能的传输层数；所述终端设备接收来自于所述无线接入网设备的参考信号；所述终端设备根据所述第二指示信息、所述第三指示信息和所述参考信号向所述无线接入网设备发送所述下行信道状态信息。第三方面提供的方法，传输层数不再与DFT向量个数绑定，而是与压缩因子绑定，由于压缩因子的取值较多，因此，可以解决DFT向量个数取值较少的情况下，现有的码本结构的相关参数的配置无法满足灵活的调整复系数矩阵中的非零元素个数的问题。
在一种可能的实现方式中，所述第二指示信息还用于指示第一发送端口数，所述第一发送端口数为至少一个发送端口数中的一个，所述发送端口数为所述无线接入网设备发送所述参考信号的可能的端口数。该种可能的实现方式，第一发送端口数和第一DFT向量个数可以同时指示给终端设备，可以降低信令开销。
在一种可能的实现方式中，所述第二指示信息通过第二表格中的第二索引实现，所述第二表格中包括至少一个所述发送端口数与至少一个所述DFT向量个数之间的对应关系，所述第二索引用于指示所述第一发送端口数和所述第一DFT向量个数。该种可能的实现方式，无线接入网设备通过第二索引指示第一发送端口数和第一DFT向量个数，相比直接指示第一发送端口数和第一DFT向量个数，可以降低信令开销。
在一种可能的实现方式中，所述方法还包括：所述终端设备接收来自于所述无线接入网设备的第二配置信息，所述第二配置信息用于配置所述第二表格。该种可能的实现方式，可以使得终端设备确定第二表格，以便在无线接入网设备指示第二表格中的索引时，终端设备可以根据该索引确定发送端口数和DFT向量个数。
在一种可能的实现方式中，选择端口数为预设值，所述选择端口数为所述终端设备向所述无线接入网设备发送所述下行信道状态信息时用于进行端口选择的端口数。
在一种可能的实现方式中，所述DFT向量个数为1。
第四方面，提供了一种信息传输方法，包括：无线接入网设备向终端设备发送第二指示信息和第三指示信息，所述第二指示信息用于指示第一DFT向量个数，所述第一DFT向量个数为至少一个DFT向量个数中的一个，所述DFT向量个数为频域基底矩阵包括的可能的DFT向量的个数，所述第三指示信息用于指示第一压缩因子，所述第一压缩因子为至少一个压缩因子中的一个，所述压缩因子为复系数矩阵的可能的压缩因子，所述复系数矩阵是根据所述终端设备选择的端口和所述频域基底矩阵确定的，所述压缩因子与传输层数有对应关系，所述传输层数是指所述终端设备向所述无线接入网设备上报的下行信道状态信息对应的可能的传输层数；所述无线接入网设备向所述终端设备发送参考信号；其中，所述第二指示信息、所述第三指示信息和所述参考信号用于确定所述下行信道状态信息。第四方面提供的方法，传输层数不再与DFT向量个数绑定，而是与压缩因子绑定，由于压缩因子的取值较多，因此，可以解决DFT向量个数取值较少的情况下，现有的码本结构的相关参数的配置无法满足灵活的调整复系数矩阵中的非零元素个数的问题。
在一种可能的实现方式中，所述方法还包括：所述无线接入网设备接收来自于所述终端设备的所述下行信道状态信息；所述无线接入网设备根据所述下行信道状态信息确定预编码 矩阵；所述无线接入网设备根据所述预编码矩阵对数据进行预编码。
在一种可能的实现方式中，所述第二指示信息还用于指示第一发送端口数，所述第一发送端口数为至少一个发送端口数中的一个，所述发送端口数为所述无线接入网设备发送所述参考信号的可能的端口数。该种可能的实现方式，第一发送端口数和第一DFT向量个数可以同时指示给终端设备，可以降低信令开销。
在一种可能的实现方式中，所述第二指示信息通过第二表格中的第二索引实现，所述第二表格中包括至少一个所述发送端口数与至少一个所述DFT向量个数之间的对应关系，所述第二索引用于指示所述第一发送端口数和所述第一DFT向量个数。该种可能的实现方式，无线接入网设备通过第二索引指示第一发送端口数和第一DFT向量个数，相比直接指示第一发送端口数和第一DFT向量个数，可以降低信令开销。
在一种可能的实现方式中，所述方法还包括：所述无线接入网设备向所述终端设备发送第二配置信息，所述第二配置信息用于配置所述第二表格。该种可能的实现方式，可以使得终端设备确定第二表格，以便在无线接入网设备指示第二表格中的索引时，终端设备可以根据该索引确定发送端口数和DFT向量个数。
在一种可能的实现方式中，选择端口数为预设值，所述选择端口数为所述终端设备向所述无线接入网设备发送所述下行信道状态信息时用于进行端口选择的端口数。
在一种可能的实现方式中，所述DFT向量个数为1。
第五方面，提供了一种通信装置，包括：通信单元和处理单元；处理单元，用于通过通信单元接收来自于无线接入网设备的第一指示信息和第二指示信息，第一指示信息用于指示第一信息和第二信息，第二指示信息用于指示第一DFT向量个数，第一DFT向量个数为至少一个DFT向量个数中的一个，DFT向量个数为频域基底矩阵包括的可能的DFT向量的个数，第一信息用于指示第一选择端口数，第一选择端口数为至少一个选择端口数中的一个，选择端口数为通信装置用于进行端口选择的可能的端口数，第二信息用于指示第一压缩因子，第一压缩因子为至少一个压缩因子中的一个，压缩因子为复系数矩阵的可能的压缩因子，复系数矩阵是根据通信装置选择的端口和频域基底矩阵确定的，压缩因子与传输层数有对应关系，传输层数是指通信装置向无线接入网设备上报的下行信道状态信息对应的可能的传输层数；处理单元，还用于通过通信单元接收来自于无线接入网设备的参考信号；处理单元，还用于根据第一指示信息、第二指示信息和参考信号，通过通信单元向无线接入网设备发送下行信道状态信息。示例性的，该通信装置为终端设备。
在一种可能的实现方式中，选择端口数为每个极化方向上通信装置用于进行端口选择的端口数。
在一种可能的实现方式中，第一指示信息通过第一表格中的第一索引实现，第一表格中包括至少一个选择端口数与至少一个压缩因子之间的对应关系，第一索引用于指示第一选择端口数和第一压缩因子；其中，不同的传输层数对应的压缩因子相同；或者，不同的传输层数中的至少两个传输层数对应的压缩因子不同。
在一种可能的实现方式中，第二指示信息还用于指示第一发送端口数，第一发送端口数为至少一个发送端口数中的一个，发送端口数为无线接入网设备发送参考信号的可能的端口数。
在一种可能的实现方式中，第二指示信息通过第二表格中的第二索引实现，第二表格中包括至少一个发送端口数与至少一个DFT向量个数之间的对应关系，第二索引用于指示第一发送端口数和第一DFT向量个数。
在一种可能的实现方式中，处理单元，还用于通过通信单元接收来自于无线接入网设备的第二配置信息，第二配置信息用于配置第二表格。
在一种可能的实现方式中，第一指示信息和第二指示信息通过第一表格中的第一索引实现，第一表格中包括至少一个DFT向量个数、至少一个选择端口数和至少一个压缩因子之间的对应关系，第一索引用于指示第一DFT向量个数、第一选择端口数和第一压缩因子；其中，不同的传输层数对应的压缩因子相同；或者，不同的传输层数中的至少两个传输层数对应的压缩因子不同。
在一种可能的实现方式中，处理单元，还用于通过通信单元接收来自于无线接入网设备的第一配置信息，第一配置信息用于配置第一表格。
在一种可能的实现方式中，DFT向量个数为1或2。
第六方面，提供了一种通信装置，包括：通信单元和处理单元；处理单元，用于通过通信单元向终端设备发送第一指示信息和第二指示信息，第一指示信息用于指示第一信息和第二信息，第二指示信息用于指示第一DFT向量个数，第一DFT向量个数为至少一个DFT向量个数中的一个，DFT向量个数为频域基底矩阵包括的可能的DFT向量的个数，第一信息用于指示第一选择端口数，第一选择端口数为至少一个选择端口数中的一个，选择端口数为终端设备用于进行端口选择的可能的端口数，第二信息用于指示第一压缩因子，第一压缩因子为至少一个压缩因子中的一个，压缩因子为复系数矩阵的可能的压缩因子，复系数矩阵是根据终端设备选择的端口和频域基底矩阵确定的，压缩因子与传输层数有对应关系，传输层数是指终端设备向通信装置上报的下行信道状态信息对应的可能的传输层数；处理单元，还用于通过通信单元向终端设备发送参考信号；其中，第一指示信息、第二指示信息和参考信号用于终端设备确定下行信道状态信息。示例性的，该通信装置为无线接入网设备。
在一种可能的实现方式中，处理单元，还用于：通过通信单元接收来自于终端设备的下行信道状态信息；根据下行信道状态信息确定预编码矩阵；根据预编码矩阵对数据进行预编码。
在一种可能的实现方式中，选择端口数为每个极化方向上终端设备用于进行端口选择的端口数。
在一种可能的实现方式中，第一指示信息通过第一表格中的第一索引实现，第一表格中包括至少一个选择端口数与至少一个压缩因子之间的对应关系，第一索引用于指示第一选择端口数和第一压缩因子；其中，不同的传输层数对应的压缩因子相同；或者，不同的传输层数中的至少两个传输层数对应的压缩因子不同。
在一种可能的实现方式中，第二指示信息还用于指示第一发送端口数，第一发送端口数为至少一个发送端口数中的一个，发送端口数为通信装置发送参考信号的可能的端口数。
在一种可能的实现方式中，第二指示信息通过第二表格中的第二索引实现，第二表格中包括至少一个发送端口数与至少一个DFT向量个数之间的对应关系，第二索引用于指示第一发送端口数和第一DFT向量个数。
在一种可能的实现方式中，处理单元，还用于通过通信单元向终端设备发送第二配置信息，第二配置信息用于配置第二表格。
在一种可能的实现方式中，第一指示信息和第二指示信息通过第一表格中的第一索引实现，第一表格中包括至少一个DFT向量个数、至少一个选择端口数和至少一个压缩因子之间的对应关系，第一索引用于指示第一DFT向量个数、第一选择端口数和第一压缩因子；其中，不同的传输层数对应的压缩因子相同；或者，不同的传输层数中的至少两个传输层数对应的 压缩因子不同。
在一种可能的实现方式中，处理单元，还用于通过通信单元向终端设备发送第一配置信息，第一配置信息用于配置第一表格。
在一种可能的实现方式中，DFT向量个数为1或2。
第七方面，提供了一种通信装置，包括：通信单元和处理单元；所述处理单元，用于通过所述通信单元接收来自于无线接入网设备的第二指示信息和第三指示信息，所述第二指示信息用于指示第一DFT向量个数，所述第一DFT向量个数为至少一个DFT向量个数中的一个，所述DFT向量个数为频域基底矩阵包括的可能的DFT向量的个数，所述第三指示信息用于指示第一压缩因子，所述第一压缩因子为至少一个压缩因子中的一个，所述压缩因子为复系数矩阵的可能的压缩因子，所述复系数矩阵是根据所述终端设备选择的端口和所述频域基底矩阵确定的，所述压缩因子与传输层数有对应关系，所述传输层数是指所述通信装置向所述无线接入网设备上报的下行信道状态信息对应的可能的传输层数；所述处理单元，还用于通过所述通信单元接收来自于所述无线接入网设备的参考信号；所述处理单元，还用于根据所述第二指示信息、所述第三指示信息和所述参考信号，通过所述通信单元向所述无线接入网设备发送所述下行信道状态信息。示例性的，该通信装置为终端设备。
在一种可能的实现方式中，所述第二指示信息还用于指示第一发送端口数，所述第一发送端口数为至少一个发送端口数中的一个，所述发送端口数为所述无线接入网设备发送所述参考信号的可能的端口数。
在一种可能的实现方式中，所述第二指示信息通过第二表格中的第二索引实现，所述第二表格中包括至少一个所述发送端口数与至少一个所述DFT向量个数之间的对应关系，所述第二索引用于指示所述第一发送端口数和所述第一DFT向量个数。
在一种可能的实现方式中，所述处理单元，还用于通过所述通信单元接收来自于所述无线接入网设备的第二配置信息，所述第二配置信息用于配置所述第二表格。
在一种可能的实现方式中，选择端口数为预设值，所述选择端口数为所述通信装置向所述无线接入网设备发送所述下行信道状态信息时用于进行端口选择的端口数。
在一种可能的实现方式中，所述DFT向量个数为1。
第八方面，提供了一种通信装置，包括：通信单元和处理单元；所述处理单元，用于通过所述通信单元向终端设备发送第二指示信息和第三指示信息，所述第二指示信息用于指示第一DFT向量个数，所述第一DFT向量个数为至少一个DFT向量个数中的一个，所述DFT向量个数为频域基底矩阵包括的可能的DFT向量的个数，所述第三指示信息用于指示第一压缩因子，所述第一压缩因子为至少一个压缩因子中的一个，所述压缩因子为复系数矩阵的可能的压缩因子，所述复系数矩阵是根据所述终端设备选择的端口和所述频域基底矩阵确定的，所述压缩因子与传输层数有对应关系，所述传输层数是指所述终端设备向所述通信装置上报的下行信道状态信息对应的可能的传输层数；所述处理单元，还用于通过所述通信单元向所述终端设备发送参考信号；其中，所述第二指示信息、所述第三指示信息和所述参考信号用于确定所述下行信道状态信息。示例性的，该通信装置为无线接入网设备。
在一种可能的实现方式中，所述处理单元，还用于：通过所述通信单元接收来自于所述终端设备的所述下行信道状态信息；根据所述下行信道状态信息确定预编码矩阵；根据所述预编码矩阵对数据进行预编码。
在一种可能的实现方式中，所述第二指示信息还用于指示第一发送端口数，所述第一发送端口数为至少一个发送端口数中的一个，所述发送端口数为所述无线接入网设备发送所述 参考信号的可能的端口数。
在一种可能的实现方式中，所述第二指示信息通过第二表格中的第二索引实现，所述第二表格中包括至少一个所述发送端口数与至少一个所述DFT向量个数之间的对应关系，所述第二索引用于指示所述第一发送端口数和所述第一DFT向量个数。
在一种可能的实现方式中，所述处理单元，还用于通过所述通信单元向所述终端设备发送第二配置信息，所述第二配置信息用于配置所述第二表格。
在一种可能的实现方式中，选择端口数为预设值，所述选择端口数为所述终端设备向所述通信装置发送所述下行信道状态信息时用于进行端口选择的端口数。
在一种可能的实现方式中，所述DFT向量个数为1。
第九方面，提供了一种通信装置，包括：处理器。处理器与存储器连接，存储器用于存储计算机执行指令，处理器执行存储器存储的计算机执行指令，从而实现第一方面至第四方面中的任一方面提供的任意一种方法。示例性的，存储器和处理器可以集成在一起，也可以为独立的器件。若为后者，存储器可以位于通信装置内，也可以位于通信装置外。
在一种可能的实现方式中，处理器包括逻辑电路，还包括输入接口和/或输出接口。示例性的，输出接口用于执行相应方法中的发送的动作，输入接口用于执行相应方法中的接收的动作。
在一种可能的实现方式中，通信装置还包括通信接口和通信总线，处理器、存储器和通信接口通过通信总线连接。通信接口用于执行相应方法中的收发的动作。通信接口也可以称为收发器。可选的，通信接口包括发送器和接收器中的至少一种，该情况下，发送器用于执行相应方法中的发送的动作，接收器用于执行相应方法中的接收的动作。
在一种可能的实现方式中，通信装置以芯片的产品形态存在。
第十方面，提供了一种芯片，包括：处理器和接口，处理器通过接口与存储器耦合，当处理器执行存储器中的计算机程序或计算机执行指令时，使得第一方面至第四方面中的任一方面提供的任意一种方法被执行。
第十一方面，提供了一种通信系统，包括：上述无线接入网设备和/或上述终端设备。
第十二方面，提供了一种计算机可读存储介质，包括计算机执行指令，当该计算机执行指令在计算机上运行时，使得计算机执行第一方面至第四方面中的任一方面提供的任意一种方法。
第十三方面，提供了一种包含计算机执行指令的计算机程序产品，当该计算机执行指令在计算机上运行时，使得计算机执行第一方面至第四方面中的任一方面提供的任意一种方法。
第九方面至第十三方面中的任一种实现方式所带来的技术效果可参见第一方面至第四方面中的任一方面中对应实现方式所带来的技术效果，此处不再赘述。
需要说明的是，在方案不矛盾的前提下，上述各个方面中的方案均可以结合。
附图说明
图1为一种网络架构示意图；
图2为本申请实施例提供的一种获取下行信道的完整CSI的流程图；
图3为本申请实施例提供的一种对子带上的CSI-RS进行预编码的过程示意图；
图4A为本申请实施例提供的一种仿真结果示意图；
图4B为本申请实施例提供的一种信息传输方法的示意图；
图5为本申请实施例提供的一种仿真结果示意图；
图6为本申请实施例提供的另一种信息传输方法的示意图；
图7为本申请实施例提供的一种通信装置的组成示意图；
图8为本申请实施例提供的一种通信装置的硬件结构示意图；
图9为本申请实施例提供的另一种通信装置的硬件结构示意图。
具体实施方式
为了使得本申请实施例更加的清楚，首先对本申请涉及到的部分概念作简单介绍。
1、预编码技术
发送设备(如无线接入网设备)可以在已知信道状态的情况下，借助与信道状态相匹配的预编码矩阵来对待发送信号进行处理，使得经过预编码的待发送信号与信道相适配，从而使得接收设备(如终端设备)消除信道间影响的复杂度降低。因此，通过对待发送信号的预编码处理，接收信号质量(例如信号与干扰加噪声比(signal to interference plus noise ratio，SINR)等)得以提升。
预编码技术可以实现发送设备与多个接收设备在相同的时频资源上传输，也就是实现了多用户多输入多输出(multiple user multiple input multiple output，MU-MIMO)。应理解，本文中有关预编码技术的相关描述仅为便于理解而示例，并非用于限制本申请实施例的保护范围。在具体实现过程中，无线接入网设备主要依靠下行信道的CSI确定预编码矩阵，进而对数据进行预编码。另外，无线接入网设备还可以通过其他方式对数据进行预编码，例如，在无法获知CSI的情况下，采用预先设置的预编码矩阵或者加权处理方式进行预编码等。为了简洁，其具体内容本文不再赘述。
2、信道状态信息报告(CSI report)
CSI report也可以简称为CSI。CSI是在无线通信系统中，由接收设备(例如，终端设备)向发送设备(例如，无线接入网设备)上报的用于描述通信链路的信道属性的信息。CSI中例如可以包括但不限于，预编码矩阵指示(precoding matrix indicator，PMI)、秩指示(rank indication，RI)、信道质量指示(channel quality indicator，CQI)、层指示(layer indicator，LI)等。
本申请中主要涉及PMI。需要说明的是，终端设备向无线接入网设备上报PMI之后，无线接入网设备需要综合该PMI和其他因素确定最终使用的预编码矩阵。
3、PMI
PMI可用于指示预编码矩阵。其中，该预编码矩阵例如可以是终端设备基于各个频域单元的信道矩阵确定的预编码矩阵。PMI也可以称为码本。
4、传输层
传输层也可以称为空间层。在MIMO中，一个空间层可以看成是一个可以独立传输的数据流。为了提高频谱资源的利用率，提高通信系统的数据传输能力，无线接入网设备可以通过多个空间层向终端设备并行传输数据。传输层数也就是信道矩阵的秩(Rank)。
5、时延信息、角度信息以及角度时延信息
无线信号经过无线信道传输时，从发射天线可以经过多个路径(简称多径)到达接收天线。多径中的每条路径会对应一个时延信息和角度信息。
时延信息是无线信号在不同路径上的传输时间，由距离和速度决定，与无线信号的频域没有关系。无线信号在不同的路径上传输时，由于距离不同，存在不同的传输时延。由于无线接入网设备与终端设备之间的物理位置是固定的，因而上下行信道的多径分布在时延上是相同的。因此，FDD系统中上下行信道的时延信息可以认为是相同的，或者说，互易的。
角度信息可以是指无线信号经由无线信道到达接收天线的到达角(angle of arrival，AOA)， 也可以是指通过发射天线发射信号的离开角(angle of departure，AOD)。在本申请实施例中，该角度信息可以是指上行信号到达无线接入网设备的到达角，也可以是指无线接入网设备发射下行信号的离开角。由于上下行信道在不同频率上的传输路径的互易，上行信号的到达角和下行信号的离开角可以认为是互易的。
其中，角度信息实际可以是角度向量，时延信息实际可以是时延向量。本申请下文中，将一对时延信息和角度信息称为一个角度时延对。
6、频域向量
频域向量也可以称为频域分量向量、频域基向量等，可用于表示信道在频域的变化规律。无线信号在经过无线信道传输时，从发射天线可以经过多个路径到达接收天线。多径时延导致的频率选择性衰落，就是频域信道的变化。因此，可以通过不同的频域向量来表示不同传输路径上时延导致的信道在频域上的变化规律。一个频域向量对应一个时延信息。
示例性的，频域向量可以为离散傅里叶变换(discrete fourier transformation，DFT)向量。
7、空域向量(spatial domain vector)
空域向量也可以称为空域分量向量、波束(beam)向量、空域波束基向量、空域基向量等。空域向量中的各个元素可以表示各个天线端口(antenna port)的权重。基于空域向量中各个元素所表示的各个天线端口的权重，将各个天线端口的信号做线性叠加，可以在空间某一方向上形成信号较强的区域。一个空域向量对应一个角度信息。
示例性的，空域向量可以是DFT向量。
8、参考信号(reference signal，RS)
参考信号也可以称为导频(pilot)信号、参考序列等。在本申请实施例中，参考信号可以是用于信道测量的参考信号。例如，该参考信号可以是用于下行信道测量的CSI-RS，也可以是用于上行信道测量的信道探测参考信号(sounding reference signal，SRS)。应理解，上文列举的参考信号仅为示例，不应对本申请构成任何限定。本申请并不排除在未来的协议中定义其他参考信号以实现相同或相似功能的可能。用于获取下行信道的CSI的RS也可称为下行参考信号或CSI-RS。
无线接入网设备可对参考信号进行预编码后，发送给终端设备。其中，预编码具体可以包括波束赋形(beamforming)和相位旋转。其中，波束赋形例如可以通过基于一个或多个角度向量对参考信号进行预编码来实现，相位旋转例如可以通过将一个或多个时延向量对参考信号进行预编码来实现。
9、端口(port)
本申请中的端口是指参考信号的端口，具体是指用于传输参考信号的天线端口，无线接入网设备可配置参考信号的端口数P。本文中，参考信号的每个端口可被加载角度信息和/或时延信息，即每个端口可以是经过波束赋形和/或相位旋转后的端口。例如，每个端口的参考信号可以是基于一个角度向量和/或一个时延向量对参考信号进行预编码得到的。
本文中，若无特别说明或限定，端口均是指发送下行参考信号(例如，CSI-RS)的端口，例如，下文中的P个端口是指P个发送下行参考信号的端口，K1个端口是指K1个发送下行参考信号的端口。每个端口的参考信号可以通过一个或者多个频域单元传输。假设每个端口的参考信号的传输带宽为N个频域单元。该N个频域单元可以为频率连续或不连续的频域单元。
10、频域单元
频域单元也可称为频率单元，表示频域资源的单位，可表示不同的频域资源粒度。频域 单元例如可以包括但不限于，一个或多个子带(sub band，SB)、一个或多个资源块(RB)、一个或多个资源块组(resource block group，RBG)、一个或多个预编码资源块组(precoding resource block group，PRG)等。在以下实施例中，涉及频域单元的相关描述都通过子带来描述。应理解，子带仅为频域单元的一种情况，不应对本申请构成任何限定。
以上是对本申请涉及到的部分概念所作的简单介绍。
本申请实施例提供的方法可以应用于长期演进(long term evolution，LTE)系统、第五代(5th-generation，5G)系统、新无线(new radio，NR)系统，无线局域网(wireless local area networks，WLAN)系统以及未来演进系统或者多种通信融合系统。其中，5G系统可以为非独立组网(non-standalone，NSA)的5G系统或独立组网(standalone，SA)的5G系统。为了方便描述，本申请实施例中以提供的方法应用于5G系统或NR系统中为例对本申请实施例提供的方法作示例性说明。当本申请实施例提供的方法应用于其他系统中时，将本申请实施例中的网元替换为相应系统中的具备相同或相似功能的网元理解即可。
本申请涉及到的网元包括无线接入网设备和终端设备，无线接入网设备和终端设备之间可以进行上下行通信。示例性的，参见图1，无线接入网设备和多个终端设备组成一个通信系统。在该通信系统中，终端设备1～终端设备6中的一个或多个终端设备可以发送上行信息给无线接入网设备，无线接入网设备也可以发送下行信息给终端设备1～终端设备6中的一个或多个终端设备。此外，部分终端设备(例如，终端设备4～终端设备6)也可以组成另一个通信系统。在该通信系统中，终端设备之间可以进行侧行链路通信，例如，终端设备5可以发送侧行信息给终端设备4和终端设备6。
无线接入网设备为网络侧的一种用于发送信号，或者，接收信号，或者，发送信号和接收信号的实体。无线接入网设备可以为部署在无线接入网(radio access network，RAN)中为终端设备提供无线通信功能的装置，例如可以为基站。无线接入网设备可以为各种形式的宏基站，微基站(也称为小站)，中继站，接入点(access point，AP)等，也可以包括各种形式的控制节点，如网络控制器。所述控制节点可以连接多个基站，并为所述多个基站覆盖下的多个终端设备配置资源。在采用不同的无线接入技术的系统中，具备基站功能的设备的名称可能会有所不同。例如，全球移动通信系统(global system for mobile communication，GSM)或码分多址(code division multiple access，CDMA)网络中可以称为基站收发信台(base transceiver station，BTS)，宽带码分多址(wideband code division multiple access，WCDMA)中可以称为基站(NodeB)，LTE系统中可以称为演进型基站(evolved NodeB，eNB或eNodeB)，NR系统中可以称为下一代基站节点(next generation node base station，gNB)，本申请对基站的具体名称不作限定。无线接入网设备还可以是云无线接入网络(cloud radio access network，CRAN)场景下的无线控制器、未来演进的公共陆地移动网络(public land mobile network，PLMN)中的无线接入网设备、传输接收节点(transmission and reception point，TRP)等。
终端设备用于向用户提供语音服务和数据连通性服务中的一种或多种，终端设备是用户侧的一种用于接收信号，或者，发送信号，或者，接收信号和发送信号的实体。终端设备还可以称为用户设备(user equipment，UE)、终端、接入终端、用户单元、用户站、移动站、远方站、远程终端、移动终端、移动设备、用户终端、无线通信设备、用户代理或用户装置。终端设备可以是移动站(mobile station，MS)、用户单元(subscriber unit)、无人机、物联网(internet of things，IoT)设备、无线局域网(wireless local area networks，WLAN)中的站点(station，ST)、蜂窝电话(cellular phone)、智能电话(smart phone)、无绳电话、无线数据卡、平板型电脑、会话启动协议(session initiation protocol，SIP)电话、无线本地环路(wireless local loop， WLL)站、个人数字助理(personal digital assistant，PDA)设备、膝上型电脑(laptop computer)、机器类型通信(machine type communication，MTC)终端设备、具有无线通信功能的手持设备、计算设备或连接到无线调制解调器的其它处理设备、车载设备、可穿戴设备(也可以称为穿戴式智能设备)。终端设备还可以为下一代通信系统中的终端设备，例如，未来演进的PLMN中的终端设备，NR系统中的终端设备等。
在FDD系统中，上下行信道具有部分互易性，具有互易性的信息包括时延信息和角度信息。因此，可以基于FDD的部分互易性，来进行下行CSI获取方案的设计。无线接入网设备可以利用FDD的部分互易性，将从上行信道得到的互易性的信息加载到参考信号上，并发送参考信号给终端设备，终端设备只需要反馈不互易的信息。无线接入网设备利用终端设备反馈的不互易的信息，并结合互易性的信息，确定完整的与预编码矩阵相关的信息，进而确定下行信道的完整CSI。示例性的，参见图2，无线接入网设备获取下行信道的完整CSI的过程包括：
11)终端设备向无线接入网设备发送上行参考信号。相应的，无线接入网设备从终端设备接收上行参考信号。
12)无线接入网设备根据上行参考信号确定上行信道矩阵(即上行CSI)，根据上行信道矩阵估计时延信息和角度信息。
13)无线接入网设备将时延信息和角度信息加载到下行参考信号。
在步骤13)之前，无线接入网设备可以向终端设备发送配置信息，该配置信息用于配置下行参考信号的发送周期、时频资源等，以便终端设备在相应的资源上接收下行参考信号。
14)无线接入网设备向终端设备发送下行参考信号。相应的，终端设备接收下行参考信号。
15)终端设备根据下行参考信号确定码本的码本结构中的信息，码本的码本结构中的信息包括时延信息和角度信息的复系数(即下文中的W 2)。
16)终端设备反馈下行信道的CSI。相应的，无线接入网设备从终端设备接收下行信道的CSI。其中，下行信道的CSI中包括码本的码本结构中的信息。
17)无线接入网设备根据码本的码本结构中的信息构造码本，根据时延信息和角度信息，以及码本确定完整的与预编码矩阵相关的信息，再结合终端设备上报的其他信息(例如，上文中的CQI、RI、LI等)确定下行信道的完整CSI。
以下基于图3中的(a)、图3中的(b)、图3中的(c)和图3中的(d)所示的示例对上述步骤12)～步骤16)的具体实现过程进行示例性说明，该实现过程包括：
步骤1、参见图3中的(a)，无线接入网设备获取的上行信道矩阵的维度为T*Y，其中，T为上行信道矩阵的行数，Y为上行信道矩阵的列数。T为无线接入网设备用于接收上行参考信号的天线端口的个数，Y为无线接入网设备接收上行参考信号的天线端口对应的子带个数。图3中的(a)中所示的上行信道矩阵中的一个方框表示一个元素，每个元素的取值均为复数。一个元素表示一个天线端口上的一个子带上的信道的幅度和相位，图3中的(a)中所示的上行信道矩阵中的无填充的方框表示该方框对应的元素对应的信道的能量较小，有填充的方框表示该方框对应的元素对应的信道的能量较大。无线接入网设备对上行信道矩阵进行时延角度估计(或者说进行天线端口和频域的分解)得到P个角度时延对，P为无线接入网设备用于发送下行参考信号的端口个数。以下行参考信号为CSI-RS为例，图3中的(b)中所示的时延信息和角度信息也为一个维度为T*Y的矩阵，一个方框表示该矩阵中的一个元素，该矩阵中的有填充的一个方框对应的元素对应一个角度时延对。参见图3中的(c)，无线接 入网设备确定P个角度时延对对应的P个空域频域向量对，根据P个空域频域向量对确定P个CSI-RS权值，P个CSI-RS权值与P个端口一一对应。假设每个端口对应N个子带，由于每个子带上的CSI-RS都要进行预编码，因此，每个CSI-RS权值包括N个权值。换言之，对于P个端口发送的CSI-RS，每个端口的CSI-RS对应有一组权值，这组权值中包括该端口的CSI-RS在各个子带上对应的权值。图3中以T＝4，Y＝8，P＝4，N＝8为例进行绘制。本申请中的“*”是指“乘以”。T、Y、P和N均为大于或等于1的整数。
其中，一个角度时延对对应的空域频域向量对由该角度时延对中的角度信息对应的空域向量和该角度时延对中的时延信息对应一个频域向量组成。频域向量和空域向量可以为DFT向量也可以为其他向量。
步骤2、针对P个端口中的第i个端口，无线接入网设备采用P个CSI-RS权值中的第i个CSI-RS权值中的N个权值分别对N个子带上的CSI-RS进行预编码，并将预编码后的CSI-RS发送给终端设备。i为大于0、且小于或等于P的整数。
步骤3、终端设备根据接收到的CSI-RS进行下行信道测量，确定P个端口的等效信道的信息。其中，第i个端口在子带s上的等效信道的信息可以表示为：
Figure PCTCN2022081019-appb-000001
s为大于0、且小于或等于N的整数。
步骤4、基于获取的P个端口的等效信道的信息，终端设备根据码本的码本结构的相关参数确定码本结构中的信息，并发送给无线接入网设备。
具体的，码本W的码本结构可以表示为：
Figure PCTCN2022081019-appb-000002
其中，W 1、W 2和
Figure PCTCN2022081019-appb-000003
为码本结构中的信息。
W 1为端口选择矩阵，维度为P*K 1，K 1为终端设备从P个端口中选择的端口数。端口选择矩阵为终端设备从P*P的矩阵中选择的与K 1个端口对应的K 1个列向量组成的矩阵。P*P的矩阵中每一个列向量对应P个端口中的一个端口。W 1中的每一个列向量对应K 1个端口中的一个端口，W 1用于告知无线接入网设备终端设备选择了哪些端口。示例性的，W 1中的每一个列向量中可以只有一个元素为1，其余元素为0。W 1中的每行至多有1个非零元素，且该非零元素的值为1。1≤K 1≤P。示例性的，若P＝4，则P*P的矩阵可以为
Figure PCTCN2022081019-appb-000004
其中，第i个列向量对应第i个端口，对应第i个端口的列向量中的第i个元素的值为1。若K 1＝2，终端设备选择了第1个端口和第3个端口，则W 1为
Figure PCTCN2022081019-appb-000005
无线接入网设备在接收到W 1后，确定W 1中的一个列向量中的第1个元素的值为1，另一个列向量中的第3个元素的值为1，即可确定终端设备选择的端口为第1个端口和第3个端口。
W 2为复系数矩阵(也可以称为系数矩阵或组合系数矩阵)，维度为K 1*M v，W 2中包括至多K 0个非零的元素，1≤K 0≤K 1*M v。示例性的，W 2中的一个元素可以为K 1个端口中的一个端口的等效信道与频域基底矩阵中的一个频域向量(即一个列向量)的内积(inner product)。
W f为频域基底矩阵(也可以称为频域选择矩阵)，维度为N*M v。M v为频域基底矩阵中包含的频域向量(即列向量)的个数。M v个频域向量可以为终端设备从无线接入网设备为终端设备配置的N＇个频域向量中选择出的频域向量，也可以为无线接入网设备为终端设备配置的N＇个频域向量(此时，终端设备不需要进行选择，M v＝N＇)，1≤M v≤N＇≤N。W f中的频域向量可以为DFT向量。此处的DFT向量中包括N个元素，N个元素与N个子带一一对应，N个元素中的第s个元素为
Figure PCTCN2022081019-appb-000006
n为DFT向量的索引，n为大于或等于0、且小于N的整数。
Figure PCTCN2022081019-appb-000007
为W f的共轭转置矩阵。
示例性的，复系数矩阵中的第j行第k列的元素可以为K 1个端口中的第j个端口的等效信道与频域基底矩阵中的第k个频域向量(即第k个列向量)的内积，表示第j个端口在第k个频域向量对应的时延范围内搜索到的等效信道的相位信息和强度信息。j为大于0小于或等于K 1的整数，k为大于0、且小于或等于M v的整数。
根据上文中关于频域向量的介绍可知，不同的频域向量表示不同传输路径上时延导致的信道在频域上的变化规律。由于无线接入网设备可以获取到下行信道的时延信息，因此，可以确定和终端设备之间的信道的时延范围，该时延范围可以通过无线接入网设备配置的N＇个频域向量指示。此时，W 2指示了K 1个端口中的每个端口上，终端设备在目标时延范围内搜索到的等效信道的相位信息和强度信息。可选地，目标时延范围为N＇个频域向量中的M v个频域向量对应的时延范围，也就是W f中的M v个频域向量对应的时延范围。
基于公式1所示的码本结构，码本结构的相关参数包括K 1、β以及M v。β是压缩因子，用于对W 2进行压缩，控制终端设备的反馈开销，β例如可以为W 2中的非零元素的比例。β的设置是为了防止W 2的非零元素过多，从而增加终端设备的反馈开销。需要说明的是，终端设备需要针对每个传输层上报一个W 2。针对所有传输层上报的W 2中的非零元素的个数上限可以为
Figure PCTCN2022081019-appb-000008
也就是说，所有传输层上报的W 2中的非零元素的个数之和可以小于或等于
Figure PCTCN2022081019-appb-000009
不能大于
Figure PCTCN2022081019-appb-000010
示例性的，在传输层数为1(即Rank＝1)的情况下，所有传输层上报的W 2中的非零元素的个数上限可以为
Figure PCTCN2022081019-appb-000011
在传输层数大于1(即Rank>1)的情况下，所有传输层上报的W 2中的非零元素的个数上限可以为
Figure PCTCN2022081019-appb-000012
Figure PCTCN2022081019-appb-000013
此处的β＇即传输层数为1时的β，2*β＇即传输层数大于1时的β。
终端设备根据这些参数以及P个端口的等效信道的信息可以确定W 1、W 2和
Figure PCTCN2022081019-appb-000014
从而将W 1、W 2和
Figure PCTCN2022081019-appb-000015
发送给无线接入网设备。需要说明的是，若M v＝N＇，由于终端设备获知的N＇个频域向量是无线接入网设备为终端设备配置的，无线接入网设备知道这部分信息，因此，终端设备不需要上报
Figure PCTCN2022081019-appb-000016
给无线接入网设备。
步骤5、无线接入网设备根据接收到的码本结构中的信息构造码本，结合时延信息和角度信息确定完整的与预编码矩阵相关的信息，再结合终端设备上报的其他信息(例如，上文中的CQI、RI、LI等)确定下行信道的完整CSI。
需要说明的是，本申请上文中对于公式1所示的码本结构中的信息中的元素的确定方法仅为示例，在具体实现时可以通过其他方式确定，本申请不作限制。
针对FDD系统，上述方案给出了码本结构，但是没有给出码本结构的相关参数的配置组合。目前，现有的第三代合作伙伴计划(3rd Generation Partnership Project，3GPP)NR协议中的版本16(简称R16)Type II端口选择(Port selection)码本结构也可以表示为：
Figure PCTCN2022081019-appb-000017
其中，W 1为端口选择矩阵，维度为P*2L，W 1可以表示为
Figure PCTCN2022081019-appb-000018
A1和A2均为P/2行L列的矩阵，A1表示在一个极化方向(例如，水平极化)上从P/2个端口中选择L个端口，A2表示在另一个极化方向(例如，垂直极化)上从P/2个端口中选择L个端口。W f为频域基底矩阵，包含M v个DFT向量，维度为N*M v。W 2为复系数矩阵，维度为2L*M v。为了限制码本结构中的信息的反馈开销，在现有的通信协议3GPP技术规范(technical specifications，TS)38.214中，规定如表1所示的三元组的参数组合。表1中的P V用来确定M v的取值，根据一个P V可以唯一确定一个M v的值。R16的增强的(enhanced)Type II码本具有类似的码本结构和参数配置组合，这里不再赘述。
表1
Figure PCTCN2022081019-appb-000019
Figure PCTCN2022081019-appb-000020
示例性的，在无线接入网设备为终端设备指示表1中的索引2时，若终端设备确定传输层数为3，终端设备可以根据该索引确定每个极化方向上用于进行端口选择的端口数为2，P V为1/8，β为1/2。终端设备根据P V可以确定M v。
需要说明的是，表1中的L为每个极化方向上用于进行端口选择的端口数，公式1中的K 1为全部极化方向上用于进行端口选择的端口数。
需要说明的是，表1所示的码本结构的相关参数的配置没有考虑到FDD的部分互易性，在FDD系统中，由于无线接入网设备可以根据上行信道矩阵估计出下行信道的时延信息，从而可以确定和终端设备之间的信道的时延范围，因此，可以通过无线接入网设备配置的N＇个频域向量指示该时延范围。此时，M v的取值可以很小，例如可以为1或者2。这一点，根据图4A所示的仿真图也可以看出，在N＇＝M v的情况下，相同的反馈开销下，M v的取值较小性能(例如，数据的平均速率)更好。
根据上文中的公式1可知，通过调整W 2中的非零元素个数可以调整终端设备的反馈开销。W 2中的
Figure PCTCN2022081019-appb-000021
M v为大于0的整数，β为大于0、且小于或等于1的自然数，在M v取值较大时，M v对于W 2中的非零元素个数的调整效率影响更大。因此，可以先通过M v对W 2中的元素个数进行初步的控制，再通过β对W 2中的非零元素个数进行更加精确的控制。现有技术中，P V的取值和V(即传输层数)强相关，P V又用于确定M v，因此，V与M v是绑定的，M v的取值较多，因此，通过将V与M v绑定，可以很好的控制不同的传输层数下，W 2中的非零元素个数的调整灵活性。而若FDD系统中也采用表1所示的码本结构的相关参数的配置，由于M v的取值很少，无法通过M v来很好的控制不同的传输层数下，W 2中的非零元素个数的调整灵活性。为了解决该问题，本申请中V不再与M v绑定，而是与β绑定，由于β的取值较多，因此，可以提高W 2中的非零元素个数的调整灵活性。具体的，本申请提供了如图4B和图6所示的信息传输方法。
参见图4B，本申请提供的一种信息传输方法包括：
401、无线接入网设备向终端设备发送第一指示信息和第二指示信息。相应的，终端设备接收来自于无线接入网设备的第一指示信息和第二指示信息。
其中，第一指示信息用于指示第一信息和第二信息。第一信息用于指示第一选择端口数，第一选择端口数为至少一个选择端口数中的一个，选择端口数为终端设备用于进行端口选择的可能的端口数(即上文中的K 1或K 1/2)。第二信息用于指示第一压缩因子，第一压缩因子为至少一个压缩因子中的一个，压缩因子为复系数矩阵(即上文中的W 2)中的可能的压缩因子(即上文中的β，由于本申请中β与V有关，因此，在本申请中压缩因子记为β V)，压缩因子与传输层数(即Rank数)有对应关系，传输层数是指终端设备向无线接入网设备上报的下行信道状态信息对应的可能的传输层数，具体的，可以为码本对应的传输层数，该传输层数可以是终端设备确定的。例如，终端设备确定多个传输层数对应的速率，将速率最大的传输层数确定为码本对应的传输层数，确定码本对应的传输层数之后，针对每个传输层，终端设备都需要上报一个复系数矩阵。其中，所述多个传输层数可以是无线接入网设备指示给终端设备的，也可以是终端设备自行确定的，本申请不作限制。终端设备确定码本对应的传输层数的方法还可以为其他，本申请不作限制。
第二指示信息用于指示第一DFT向量个数，第一DFT向量个数为至少一个DFT向量个 数中的一个，DFT向量个数为频域基底矩阵(即上文中的W f)包括的可能的DFT向量的个数(即上文中的M v，由于上文中的DFT向量个数与V有关，而本申请中与V无关，因此，在本申请中该个数记为M)。
示例性的，第一信息可以为第一选择端口数，也可以为第一选择端口数与第一发送端口数(第一发送端口数为无线接入网设备为终端设备指示的发送参考信号的端口数)的比值，若为后者，由于总端口数P终端设备可以获知，因此，根据该比值和总端口数P可以确定第一选择端口数。
其中，选择端口数可以为全部极化方向上终端设备用于进行端口选择的端口数(此时，第一选择端口数用于指示K 1)，也可以为每个极化方向上终端设备用于进行端口选择的端口数(此时，第一选择端口数用于指示K 1/2)。其中，极化方向是指无线接入网设备的天线的极化方向，包括水平极化和垂直极化。无线接入网设备在一个端口上会采用水平极化或垂直极化发送CSI-RS。例如，若无线接入网设备共在32个端口上发送CSI-RS，则第一信息可以为终端设备在32个端口中选择的端口数。若无线接入网设备共在32个端口上发送CSI-RS，其中，在16个端口上采用极化方向1发送CSI-RS，在另外16个端口上采用极化方向2发送CSI-RS，则第一信息可以为终端设备在16个端口中选择的端口数。需要说明的是，终端设备在不同极化方向上选择的端口数可以相同，例如，极化方向1对应的16个端口上选择前5个端口，极化方向2对应的16个端口上也选择前5个端口。终端设备在不同极化方向上选择的端口数也可以不同，例如，极化方向1对应的16个端口上选择前5个端口，极化方向2对应的16个端口上选择后5个端口。其中，极化方向1为水平极化，极化方向2为垂直极化，或者，极化方向1为垂直极化，极化方向2为水平极化。
示例性的，第二信息可以为复系数矩阵中的压缩因子。例如，压缩因子可以为非零元素的比例，也可以为所有传输层上报的复系数矩阵中的非零元素的个数。若为后者，终端设备可以根据所有传输层上报的复系数矩阵中的非零元素的个数和单个传输层上报的复系数矩阵中的总的元素个数确定复系数矩阵中的非零元素的比例。需要说明的是，在第二信息为所有传输层上报的复系数矩阵中的非零元素的个数的情况下，终端设备也可以不计算复系数矩阵中的非零元素的比例，直接根据第二信息确定所有传输层上报的复系数矩阵中的非零元素的个数。为了方便描述，本申请下文中以β V＇为非零元素的比例为例进行描述。
其中，复系数矩阵用于指示终端设备选择的K 1个端口中的每个端口上，终端设备在目标时延范围内搜索到的等效信道的相位信息和强度信息。频域基底矩阵用于指示目标时延范围。目标时延范围为频域基底矩阵中的M个频域向量对应的时延范围。复系数矩阵是根据终端设备选择的端口和频域基底矩阵确定的。具体的，复系数矩阵是根据终端设备选择的端口的等效信道和频域基底矩阵确定的，例如，复系数矩阵中的第j行第k列的元素可以为K 1个端口中的第j个端口的等效信道与频域基底矩阵中的第k个频域向量(即第k个列向量)的内积。j为大于0小于或等于K 1的整数，k为大于0小于或等于M的整数。需要说明的是，此处仅仅对复系数矩阵中的元素的确定方法进行示例性说明，在实际实现时，可以采用其他方法确定复系数矩阵中的元素，这并不影响本申请实施例提供的方法的实现。
需要说明的是，终端设备在反馈复系数矩阵时，针对每个传输层都会反馈一个复系数矩阵。终端设备除了反馈上述码本结构中的信息之外，还会反馈每个传输层对应的复系数矩阵中的非零元素的索引。也就是说，在压缩因子相同的情况下，传输层数越多，终端设备的反馈开销越大，因此，为了控制终端设备的开销，在传输层数越多的情况下，压缩因子可以越小。例如，传输层数＝1时，压缩因子＝0.75，传输层数＝4，压缩因子＝0.25。
基于本申请中定义的M和β V，上述公式1所涉及到的M v可以替换为M、所涉及到的β可以替换为β V进行理解。
402、无线接入网设备向终端设备发送参考信号。相应的，终端设备接收来自于无线接入网设备的参考信号。其中，该参考信号为下行参考信号。
示例性的，参考信号可以为CSI-RS或其他可以用于实现本申请方案的参考信号。
在步骤402之前，无线接入网设备可以将根据上行信道矩阵估计得到的时延信息和角度信息加载到下行参考信号。
403、终端设备根据第一指示信息、第二指示信息和参考信号向无线接入网设备发送下行信道状态信息。相应的，无线接入网设备接收来自于终端设备的下行信道状态信息。
其中，下行信道状态信息可以包括W 1、W 2和
Figure PCTCN2022081019-appb-000022
还可以包括CQI、RI、LI等信息。具体的，终端设备可以根据第一指示信息和第二指示信息指示的K 1(或K 1/2)、β V、M确定W 1、W 2和
Figure PCTCN2022081019-appb-000023
需要说明的是，若M＝N＇，由于终端设备获知的N＇个频域向量是无线接入网设备为终端设备配置的，无线接入网设备知道这部分信息，因此，终端设备不上报
Figure PCTCN2022081019-appb-000024
给无线接入网设备。
需要说明的是，本申请中的W 1、W 2和
Figure PCTCN2022081019-appb-000025
与现有的W 1、W 2和
Figure PCTCN2022081019-appb-000026
的含义相同，只需要将所涉及到的M v可以替换为M、所涉及到的β可以替换为β V进行理解即可。
404、无线接入网设备根据下行信道状态信息确定预编码矩阵。
步骤404在具体实现时，无线接入网设备可以根据估计得到的时延信息和角度信息以及接收到的W 1、W 2和
Figure PCTCN2022081019-appb-000027
确定完整的与预编码矩阵相关的信息，从而确定预编码矩阵。
405、无线接入网设备根据预编码矩阵对数据进行预编码。
本申请实施例提供的方法，传输层数不再与DFT向量个数绑定，而是与压缩因子绑定，由于压缩因子的取值较多，因此，可以解决DFT向量个数取值较少的情况下，现有的码本结构的相关参数的配置无法满足灵活的调整复系数矩阵中的非零元素个数的问题。
可选的，上述第一指示信息和第二指示信息可以通过以下方式一或方式二实现。
方式一、第一指示信息和第二指示信息分别实现。
在方式一中，第一指示信息通过第一表格中的第一索引实现(即第一指示信息为第一索引)，第一表格中包括至少一个选择端口数与至少一个压缩因子之间的对应关系，第一索引用于指示第一选择端口数和第一压缩因子；其中，不同的传输层数对应的压缩因子相同；或者，不同的传输层数中的至少两个传输层数对应的压缩因子的比例不同。
需要说明的是，若不同的传输层数对应的压缩因子相同，则第一表格中可以不体现传输层数的信息，例如表2，当然也可以体现传输层数的信息，本申请不作限制。若不同的传输层数中的至少两个传输层数对应的压缩因子不同，则可以仅有部分传输层数对应的压缩因子不同，例如表3，也可以全部传输层数对应的压缩因子均不同，例如表4。
表2
索引(index) K 1(或K 1/2) β V
0 12 0.5
1 8 0.75
2 4 0.75
… … …
表3
Figure PCTCN2022081019-appb-000028
Figure PCTCN2022081019-appb-000029
表4
Figure PCTCN2022081019-appb-000030
基于表3所示的示例，若第一指示信息为索引1，传输层数为2，表3中的第二列为K 1，则第一指示信息指示的第一选择端口数为8，第一压缩因子为0.75。
在方式一中，第二指示信息还用于指示第一发送端口数，第一发送端口数为至少一个发送端口数中的一个，发送端口数为无线接入网设备发送参考信号的可能的端口数(即上文中的P)。
可选的，第二指示信息通过第二表格中的第二索引实现，第二表格中包括至少一个发送端口数与至少一个DFT向量个数之间的对应关系，第二索引用于指示第一发送端口数和第一DFT向量个数。一种可能的第二表格可参见表5。
表5
索引 P M
0 32 1
1 24 1
2 16 1
3 16 2
4 12 1
5 12 2
… … …
基于表5所示的示例，若第二指示信息为索引1，则第一发送端口数为24，第一DFT向量个数为1。
需要说明的是，M越大，无线接入网设备的导频开销越小。例如，M＝2，终端设备在16个端口上就可以反馈32个系数(即复系数矩阵中包括32个元素)，M＝1，终端设备需要在32个端口上才可以反馈32个系数。由此可知，针对某个K 1，M≥2时终端设备的反馈开销要远远大于M＝1时终端设备的反馈开销，因此，考虑到终端设备的反馈开销，M≥2没有必要应用于高端口情形，例如，M≥2可以仅用于端口数P≤P 1(M)的情形，P 1(M)表示与M相关的整数，例如P 1(2)＝16。基于此，无线接入网设备可以限定M与P的组合，限定M≥2仅用于端口数较小的情形，由此来控制终端设备的反馈开销。示例性的，一种M与P的组合可参见上述表5。需要说明的是，虽然实际影响终端设备的反馈开销的是K 1的值，但是通过限定M与P的组合，可以限制第一表格中的K 1的取值，从而可以间接的控制终端设备的反馈开销。例如，若M＝2时P＝8，则第一信息不能指示比8更大的值给终端设备，从而间接的控制终端设备的反馈开销。
需要说明的是，第一发送端口数与第一DFT向量个数也可以分别指示，本申请不作限定。
在方式一中，若第二指示信息还用于指示第一发送端口数，则可选的，该方法还包括：无线接入网设备向终端设备发送第二配置信息，第二配置信息用于配置第二表格。相应的，终端设备接收来自于无线接入网设备的第二配置信息，根据第二配置信息确定第二表格。
方式二、第一指示信息和第二指示信息共同实现。
在方式二中，第一指示信息和第二指示信息通过第一表格中的第一索引实现，第一表格中包括至少一个DFT向量个数、至少一个选择端口数和至少一个压缩因子之间的对应关系，第一索引用于指示第一DFT向量个数、第一选择端口数和第一压缩因子；其中，不同的传输层数对应的压缩因子相同；或者，不同的传输层数中的至少两个传输层数对应的压缩因子的比例不同。
在方式二中，无线接入网设备向终端设备发送第一索引，第一索引既指示了第一指示信息所指示的信息，也指示了第二指示信息所指示的信息。
需要说明的是，不同的传输层数对应的压缩因子相同，则第一表格中可以不体现传输层数的信息，例如表6，当然也可以体现传输层数的信息，本申请不作限制。若不同的传输层数中的至少两个传输层数对应的压缩因子不同，则可以仅有部分传输层数对应的压缩因子不同，例如表7，也可以全部传输层数对应的压缩因子均不同，例如表8。
表6
索引 M K 1或K 1/2 β V
0 1 12 0.5
1 1 8 0.75
2 1 4 0.75
3 2 10 0.4
4 2 6 0.6
5 2 4 0.6
… … … …
表7
Figure PCTCN2022081019-appb-000031
表8
Figure PCTCN2022081019-appb-000032
Figure PCTCN2022081019-appb-000033
在方式二中，无线接入网设备可以单独为终端设备指示P。
基于上述方式一和方式二，第一表格可以直接配置在终端设备中，也可以由无线接入网设备配置给终端设备。若为后者，该方法还包括：无线接入网设备向终端设备发送第一配置信息，第一配置信息用于配置第一表格。相应的，终端设备接收来自于无线接入网设备的第一配置信息，根据第一配置信息确定第一表格。本申请中的第一表格也可以称为码本结构参数配置组合表。
其中，上述第一配置信息和/或第二配置信息可以携带在RRC消息中。
在上述实施例中，若第一表格中不包括M的信息，在第一表格直接配置在终端设备中的情况下，相比表1，第一表格中信息更少，因此，占据的存储资源更少，节约了终端设备的存储资源；在第一表格由无线接入网设备配置给终端设备的情况下，相比表1，第一表格中信息更少，因此，节约了传输资源。
可以理解的是，方式一中的第一表格中由于将M的值单独指示了，因此，相比方式二，码本结构的相关参数的配置更加的灵活。
可选的，DFT向量个数(即M)为1或2。可选的，N＇＝M。
在FDD系统中，M的取值有以下两种情况：
情况1、N＇＝M，此时，直接由无线接入网设备配置W f，终端设备不自己构造W f，也不上报W f。
情况2、N＇＞M，此时，终端设备从配置的N＇频域向量中选择M个频域向量构成W f，终端设备可以上报W f，也可以不上报W f(例如，N＇＝2，M＝1时)。
图5为针对这两种情况所做的终端设备的性能仿真结果，从图5的仿真结果可以看到，在相同反馈开销下，相比于情况2，情况1能够提供更好的性能，即直接由无线接入网设备配置W f可以提供更好的性能。因此，在本申请中可以使得N＇＝M，从而提高终端设备的性能。
参见图6，本申请提供的另一种信息传输方法包括：
601、无线接入网设备向终端设备发送第二指示信息和第三指示信息。相应的，终端设备接收来自于无线接入网设备的第二指示信息和第三指示信息。
其中，第二指示信息用于指示第一DFT向量个数，第一DFT向量个数为至少一个DFT向量个数中的一个，DFT向量个数为频域基底矩阵包括的可能的DFT向量的个数。第三指示信息用于指示第一压缩因子，第一压缩因子为至少一个压缩因子中的一个，压缩因子为复系数矩阵的可能的压缩因子，复系数矩阵是根据终端设备选择的端口和频域基底矩阵确定的，压缩因子与传输层数有对应关系，传输层数是指终端设备向无线接入网设备上报的下行信道状态信息对应的可能的传输层数。
图6所示的实施例中的相关名词的解释可参见图4B所示的实施例，不再赘述。
可选的，选择端口数为预设值，选择端口数为终端设备向无线接入网设备发送下行信道状态信息时用于进行端口选择的端口数(可以为全部极化方向上终端设备用于进行端口选择的端口数，也可以是单个极化方向上终端设备用于进行端口选择的端口数)。示例性的，该预设值可以为P(此时，终端设备用于进行端口选择的端口数为全部极化方向上终端设备用于 进行端口选择的端口数)、P/2、P/4、P/8或其他值，本申请不作限制。
可选的，DFT向量个数(即M)为1。
根据上文中的公式1可知，通过调整W 2中的非零元素个数可以调整终端设备的反馈开销。W 2中的
Figure PCTCN2022081019-appb-000034
在M＝2的情况下，可以先通过K 1对W 2中的元素个数进行初步的控制，再通过β V对W 2中的非零元素个数进行更加精确的控制。具体的，在M＝2的情况下，若K 1变化(增加或较少)X，则W 2中的元素个数变化(增加或较少)2X，此时，通过改变K 1的值，可以较大幅度的改变W 2中的非零元素个数，在通过改变K 1的值改变W 2中的非零元素个数之后，再通过β V对W 2中的非零元素个数进行更加精确的控制，可以很好的平衡配置灵活度和开销。在M＝1的情况下，通过K 1或β V对W 2中的元素个数进行控制时，开销和灵活度是相同的。具体的，在M＝1的情况下，若K 1变化(增加或较少)X，则W 2中的元素个数变化(增加或较少)X，而根据β V调整W 2中的元素个数时，也可以减少或增加奇数个元素。因此，在M＝1的情况下，可以仅通过调整β V控制终端设备的反馈开销。
因此，在图6所示的实施例中，可以使得K 1为预设值，通过调整压缩因子来控制终端设备的反馈开销，此时，第一表格中可以不包含K 1的信息，在第一表格直接配置在终端设备中的情况下，第一表格中信息更少，因此，占据的存储资源更少，节约了终端设备的存储资源；在第一表格由无线接入网设备配置给终端设备的情况下，第一表格中信息更少，因此，节约了传输资源。
其中，第三指示信息和第二指示信息可以分别实现，此时，第三指示信息可以为第一表格中的索引，与图4B所示的实施例的区别仅在于，此时，第一表格(例如，表2、表3或表4)中不包括选择端口数的信息(即不包括K 1或K 1/2的信息)。第三指示信息和第二指示信息也可以共同实现，此时，第三指示信息和第二指示信息可以为第一表格中的索引，与图4B所示的实施例的区别仅在于，此时，第一表格(例如，表6、表7或表8)中不包括选择端口数的信息(即不包括K 1或K 1/2的信息)。具体可根据图4B所示的实施例中的方式一和方式二进行理解，不再赘述。
602、无线接入网设备向终端设备发送参考信号。相应的，终端设备接收来自于无线接入网设备的参考信号。步骤602的相关描述可参见上述步骤402，不再赘述。
603、终端设备根据第二指示信息、第三指示信息和参考信号向无线接入网设备发送下行信道状态信息。相应的，无线接入网设备接收来自于终端设备的下行信道状态信息。
其中，下行信道状态信息可以包括W 1、W 2和
Figure PCTCN2022081019-appb-000035
还可以包括CQI、RI、LI等信息。具体的，终端设备可以根据第二指示信息和第三指示信息指示的β V、M，以及预设的选择端口数确定W 1、W 2和
Figure PCTCN2022081019-appb-000036
需要说明的是，若M＝N＇，由于终端设备获知的N＇个频域向量是无线接入网设备为终端设备配置的，无线接入网设备知道这部分信息，因此，终端设备不上报
Figure PCTCN2022081019-appb-000037
给无线接入网设备。
需要说明的是，本申请中的W 1、W 2和
Figure PCTCN2022081019-appb-000038
与现有的W 1、W 2和
Figure PCTCN2022081019-appb-000039
的含义相同，只需要将所涉及到的M v可以替换为M、所涉及到的β可以替换为β V进行理解即可。
604、无线接入网设备根据下行信道状态信息确定预编码矩阵。步骤604的相关描述可参见上述步骤404，不再赘述。
605、无线接入网设备根据预编码矩阵对数据进行预编码。
可选的，第二指示信息还用于指示第一发送端口数，第一发送端口数为至少一个发送端口数中的一个，发送端口数为无线接入网设备发送参考信号的可能的端口数。该可选的方法的具体实现，可以参见图4B所示的实施例中的相关描述，不再赘述。
可选的，第二指示信息通过第二表格中的第二索引实现，第二表格中包括至少一个发送端口数与至少一个DFT向量个数之间的对应关系，第二索引用于指示第一发送端口数和第一 DFT向量个数。该可选的方法的具体实现，可以参见图4B所示的实施例中的相关描述，不再赘述。
可选的，该方法还包括：无线接入网设备向终端设备发送第二配置信息，第二配置信息用于配置第二表格。相应的，终端设备接收来自于无线接入网设备的第二配置信息。该可选的方法的具体实现，可以参见图4B所示的实施例中的相关描述，不再赘述。
图6所示的技术方案的另一种实现方式中，第三指示信息也可以指示第一选择端口数。此时，DFT向量个数(即M)为1。根据上述描述可知，在M＝1的情况下，除了通过调整压缩因子控制终端设备的反馈开销之外，也可以仅通过调整选择端口数控制终端设备的反馈开销，此时，可以将压缩因子确定为预设值。这种情况下，第一表格中可以不包含β V的信息，在第一表格直接配置在终端设备中的情况下，第一表格中信息更少，因此，占据的存储资源更少，节约了终端设备的存储资源；在第一表格由无线接入网设备配置给终端设备的情况下，第一表格中信息更少，因此，节约了传输资源。
本申请实施例提供的方法，传输层数不再与DFT向量个数绑定，而是与压缩因子绑定，由于压缩因子的取值较多，因此，可以解决DFT向量个数取值较少的情况下，现有的码本结构的相关参数的配置无法满足灵活的调整复系数矩阵中的非零元素个数的问题。
上述表2至表8仅仅为本申请实施例对第一表格和第二表格的示例，在实际实现时，第一表格和第二表格中的数值可以为其他。具体的数值可以是协议规定的，或预先配置的，或无线接入网设备配置的，或无线接入网设备和终端设备协商确定的，本申请不作限制。上述表2至表4，表6至表8中的β V均以非零元素的比例为例进行示例。
在本申请的描述中，除非另有说明，“/”表示“或”的意思，例如，A/B可以表示A或B。本文中的“和/或”仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。此外，“至少一个”是指一个或多个，“多个”是指两个或两个以上。“第一”、“第二”等字样并不对数量和执行次序进行限定，并且“第一”、“第二”等字样也并不限定一定不同。
需要说明的是，本申请中，“示例性的”或者“例如”等词用于表示作例子、例证或说明。本申请中被描述为“示例性的”或者“例如”的任何实施例或设计方案不应被解释为比其他实施例或设计方案更优选或更具优势。确切而言，使用“示例性的”或者“例如”等词旨在以具体方式呈现相关概念。
上述主要从方法的角度对本申请实施例的方案进行了介绍。可以理解的是，各个网元，例如，无线接入网设备和终端设备为了实现上述功能，其包含了执行各个功能相应的硬件结构和软件模块中的至少一个。本领域技术人员应该很容易意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，本申请能够以硬件或硬件和计算机软件的结合形式来实现。某个功能究竟以硬件还是计算机软件驱动硬件的方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
本申请实施例可以根据上述方法示例对无线接入网设备和终端设备进行功能单元的划分，例如，可以对应各个功能划分各个功能单元，也可以将两个或两个以上的功能集成在一个处理单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。需要说明的是，本申请实施例中对单元的划分是示意性的，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式。
示例性的，图7示出了上述实施例中所涉及的通信装置(记为通信装置70)的一种可能 的结构示意图，该通信装置70包括处理单元701和通信单元702。可选的，还包括存储单元703。通信装置70可以用于示意上述实施例中的终端设备和无线接入网设备的结构。
当图7所示的结构示意图用于示意上述实施例中所涉及的终端设备的结构时，处理单元701用于对终端设备的动作进行控制管理，例如，处理单元701用于执行图4B中的401至403，图6中的601至603，和/或本申请实施例中所描述的其他过程中的终端设备执行的动作。处理单元701可以通过通信单元702与其他网络实体通信，例如，与图4B中的无线接入网设备通信。存储单元703用于存储终端设备的程序代码和数据。
当图7所示的结构示意图用于示意上述实施例中所涉及的无线接入网设备的结构时，处理单元701用于对无线接入网设备的动作进行控制管理，例如，处理单元701用于执行图4B中的401至405，图6中的601至605，和/或本申请实施例中所描述的其他过程中的无线接入网设备执行的动作。处理单元701可以通过通信单元702与其他网络实体通信，例如，与图4B中的终端设备通信。存储单元703用于存储无线接入网设备的程序代码和数据。
示例性的，通信装置70可以为一个设备也可以为芯片或芯片系统。
当通信装置70为一个设备时，处理单元701可以是处理器；通信单元702可以是通信接口、收发器，或，输入接口和/或输出接口。可选地，收发器可以为收发电路。可选地，输入接口可以为输入电路，输出接口可以为输出电路。
当通信装置70为芯片或芯片系统时，通信单元702可以是该芯片或芯片系统上的通信接口、输入接口和/或输出接口、接口电路、输出电路、输入电路、管脚或相关电路等。处理单元701可以是处理器、处理电路或逻辑电路等。
图7中的集成的单元如果以软件功能模块的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请实施例的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的全部或部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)或处理器(processor)执行本申请各个实施例所述方法的全部或部分步骤。存储计算机软件产品的存储介质包括：U盘、移动硬盘、只读存储器(read-only memory，ROM)、随机存取存储器(random access memory，RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
本申请实施例还提供了一种通信装置的硬件结构示意图，参见图8或图9，该通信装置包括处理器801，可选的，还包括与处理器801连接的存储器802。
处理器801可以是一个通用中央处理器(central processing unit，CPU)、微处理器、特定应用集成电路(application-specific integrated circuit，ASIC)，或者一个或多个用于控制本申请方案程序执行的集成电路。处理器801也可以包括多个CPU，并且处理器801可以是一个单核(single-CPU)处理器，也可以是多核(multi-CPU)处理器。这里的处理器可以指一个或多个设备、电路或用于处理数据(例如计算机程序指令)的处理核。
存储器802可以是ROM或可存储静态信息和指令的其他类型的静态存储设备、RAM或者可存储信息和指令的其他类型的动态存储设备，也可以是电可擦可编程只读存储器(electrically erasable programmable read-only memory，EEPROM)、只读光盘(compact disc read-only memory，CD-ROM)或其他光盘存储、光碟存储(包括压缩光碟、激光碟、光碟、数字通用光碟、蓝光光碟等)、磁盘存储介质或者其他磁存储设备、或者能够用于携带或存储具有指令或数据结构形式的期望的程序代码并能够由计算机存取的任何其他介质，本申请实施例对此不作任何限制。存储器802可以是独立存在(此时，存储器802可以位于通信 装置外，也可以位于通信装置内)，也可以和处理器801集成在一起。其中，存储器802中可以包含计算机程序代码。处理器801用于执行存储器802中存储的计算机程序代码，从而实现本申请实施例提供的方法。
在第一种可能的实现方式中，参见图8，通信装置还包括收发器803。处理器801、存储器802和收发器803通过总线相连接。收发器803用于与其他设备或通信网络通信。可选的，收发器803可以包括发射机和接收机。收发器803中用于实现接收功能的器件可以视为接收机，接收机用于执行本申请实施例中的接收的步骤。收发器803中用于实现发送功能的器件可以视为发射机，发射机用于执行本申请实施例中的发送的步骤。
基于第一种可能的实现方式，图8所示的结构示意图可以用于示意上述实施例中所涉及的终端设备和无线接入网设备的结构。
当图8所示的结构示意图用于示意上述实施例中所涉及的终端设备的结构时，处理器801用于对终端设备的动作进行控制管理，例如，处理器801用于执行图4B中的401至403，图6中的601至603，和/或本申请实施例中所描述的其他过程中的终端设备执行的动作。处理器801可以通过收发器803与其他网络实体通信，例如，与图4B中的无线接入网设备通信。存储器802用于存储终端设备的程序代码和数据。
当图8所示的结构示意图用于示意上述实施例中所涉及的无线接入网设备的结构时，处理器801用于对无线接入网设备的动作进行控制管理，例如，处理器801用于执行图4B中的401至405，图6中的601至605，和/或本申请实施例中所描述的其他过程中的无线接入网设备执行的动作。处理器801可以通过收发器803与其他网络实体通信，例如，与图4B中的终端设备通信。存储器802用于存储无线接入网设备的程序代码和数据。
在第二种可能的实现方式中，处理器801包括逻辑电路以及输入接口和/或输出接口。示例性的，输出接口用于执行相应方法中的发送的动作，输入接口用于执行相应方法中的接收的动作。
基于第二种可能的实现方式，参见图9，图9所示的结构示意图可以用于示意上述实施例中所涉及的终端设备和无线接入网设备的结构。
当图9所示的结构示意图用于示意上述实施例中所涉及的终端设备的结构时，处理器801用于对终端设备的动作进行控制管理，例如，处理器801用于执行图4B中的401至403，图6中的601至603，和/或本申请实施例中所描述的其他过程中的终端设备执行的动作。处理器801可以通过输入接口和/或输出接口与其他网络实体通信，例如，与图4B中的无线接入网设备通信。存储器802用于存储终端设备的程序代码和数据。
当图9所示的结构示意图用于示意上述实施例中所涉及的无线接入网设备的结构时，处理器801用于对无线接入网设备的动作进行控制管理，例如，处理器801用于执行图4B中的401至405，图6中的601至605，和/或本申请实施例中所描述的其他过程中的无线接入网设备执行的动作。处理器801可以通过输入接口和/或输出接口与其他网络实体通信，例如，与图4B中的终端设备通信。存储器802用于存储无线接入网设备的程序代码和数据。
在实现过程中，本实施例提供的方法中的各步骤可以通过处理器中的硬件的集成逻辑电路或者软件形式的指令完成。结合本申请实施例所公开的方法的步骤可以直接体现为硬件处理器执行完成，或者用处理器中的硬件及软件模块组合执行完成。
本申请实施例还提供了一种计算机可读存储介质，包括计算机执行指令，当其在计算机上运行时，使得计算机执行上述任一方法。
本申请实施例还提供了一种包含计算机执行指令的计算机程序产品，当其在计算机上运 行时，使得计算机执行上述任一方法。
本申请实施例还提供了一种通信系统，包括：终端设备和无线接入网设备。
本申请实施例还提供了一种芯片，包括：处理器和接口，处理器通过接口与存储器耦合，当处理器执行存储器中的计算机程序或计算机执行指令时，使得上述实施例提供的任意一种方法被执行。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件程序实现时，可以全部或部分地以计算机程序产品的形式来实现。该计算机程序产品包括一个或多个计算机执行指令。在计算机上加载和执行计算机执行指令时，全部或部分地产生按照本申请实施例所述的流程或功能。计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。计算机执行指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，计算机执行指令可以从一个网站站点、计算机、服务器或者数据中心通过有线(例如同轴电缆、光纤、数字用户线(digital subscriber line，DSL))或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可以用介质集成的服务器、数据中心等数据存储设备。可用介质可以是磁性介质(例如，软盘、硬盘、磁带)，光介质(例如，DVD)、或者半导体介质(例如固态硬盘(solid state disk，SSD))等。
尽管在此结合各实施例对本申请进行了描述，然而，在实施所要求保护的本申请过程中，本领域技术人员通过查看附图、公开内容、以及所附权利要求书，可理解并实现公开实施例的其他变化。在权利要求中，“包括”(comprising)一词不排除其他组成部分或步骤，“一”或“一个”不排除多个的情况。单个处理器或其他单元可以实现权利要求中列举的若干项功能。相互不同的从属权利要求中记载了某些措施，但这并不表示这些措施不能组合起来产生良好的效果。
尽管结合具体特征及其实施例对本申请进行了描述，显而易见的，在不脱离本申请的精神和范围的情况下，可对其进行各种修改和组合。相应地，本说明书和附图仅仅是所附权利要求所界定的本申请的示例性说明，且视为已覆盖本申请范围内的任意和所有修改、变化、组合或等同物。显然，本领域的技术人员可以对本申请进行各种改动和变型而不脱离本申请的精神和范围。这样，倘若本申请的这些修改和变型属于本申请权利要求及其等同技术的范围之内，则本申请也意图包含这些改动和变型在内。

Claims (43)

  1. 一种信息传输方法，其特征在于，包括：
    终端设备接收来自于无线接入网设备的第一指示信息和第二指示信息，所述第一指示信息用于指示第一信息和第二信息，所述第二指示信息用于指示第一离散傅里叶变换DFT向量个数，所述第一DFT向量个数为至少一个DFT向量个数中的一个，所述DFT向量个数为频域基底矩阵包括的可能的DFT向量的个数，所述第一信息用于指示第一选择端口数，所述第一选择端口数为至少一个选择端口数中的一个，所述选择端口数为所述终端设备用于进行端口选择的可能的端口数，所述第二信息用于指示第一压缩因子，所述第一压缩因子为至少一个压缩因子中的一个，所述压缩因子为复系数矩阵的可能的压缩因子，所述复系数矩阵是根据所述终端设备选择的端口和所述频域基底矩阵确定的，所述压缩因子与传输层数有对应关系，所述传输层数是指所述终端设备向所述无线接入网设备上报的下行信道状态信息对应的可能的传输层数；
    所述终端设备接收来自于所述无线接入网设备的参考信号；
    所述终端设备根据所述第一指示信息、所述第二指示信息和所述参考信号向所述无线接入网设备发送所述下行信道状态信息。
  2. 根据权利要求1所述的方法，其特征在于，所述选择端口数为每个极化方向上所述终端设备用于进行端口选择的端口数。
  3. 根据权利要求1或2所述的方法，其特征在于，所述第一指示信息通过第一表格中的第一索引实现，所述第一表格中包括至少一个所述选择端口数与至少一个所述压缩因子之间的对应关系，所述第一索引用于指示所述第一选择端口数和所述第一压缩因子；其中，不同的所述传输层数对应的所述压缩因子相同；或者，不同的所述传输层数中的至少两个传输层数对应的所述压缩因子不同。
  4. 根据权利要求1-3任一项所述的方法，其特征在于，所述第二指示信息还用于指示第一发送端口数，所述第一发送端口数为至少一个发送端口数中的一个，所述发送端口数为所述无线接入网设备发送所述参考信号的可能的端口数。
  5. 根据权利要求4所述的方法，其特征在于，所述第二指示信息通过第二表格中的第二索引实现，所述第二表格中包括至少一个所述发送端口数与至少一个所述DFT向量个数之间的对应关系，所述第二索引用于指示所述第一发送端口数和所述第一DFT向量个数。
  6. 根据权利要求5所述的方法，其特征在于，所述方法还包括：
    所述终端设备接收来自于所述无线接入网设备的第二配置信息，所述第二配置信息用于配置所述第二表格。
  7. 根据权利要求1或2所述的方法，其特征在于，所述第一指示信息和所述第二指示信息通过第一表格中的第一索引实现，所述第一表格中包括至少一个所述DFT向量个数、至少一个所述选择端口数和至少一个所述压缩因子之间的对应关系，所述第一索引用于指示所述第一DFT向量个数、所述第一选择端口数和所述第一压缩因子；其中，不同的所述传输层数对应的所述压缩因子相同；或者，不同的所述传输层数中的至少两个传输层数对应的所述压缩因子不同。
  8. 根据权利要求3或7所述的方法，其特征在于，所述方法还包括：
    所述终端设备接收来自于所述无线接入网设备的第一配置信息，所述第一配置信息用于配置所述第一表格。
  9. 根据权利要求1-8任一项所述的方法，其特征在于，所述DFT向量个数为1或2。
  10. 一种信息传输方法，其特征在于，包括：
    无线接入网设备向终端设备发送第一指示信息和第二指示信息，所述第一指示信息用于指示第一信息和第二信息，所述第二指示信息用于指示第一离散傅里叶变换DFT向量个数，所述第一DFT向量个数为至少一个DFT向量个数中的一个，所述DFT向量个数为频域基底矩阵包括的可能的DFT向量的个数，所述第一信息用于指示第一选择端口数，所述第一选择端口数为至少一个选择端口数中的一个，所述选择端口数为所述终端设备用于进行端口选择的可能的端口数，所述第二信息用于指示第一压缩因子，所述第一压缩因子为至少一个压缩因子中的一个，所述压缩因子为复系数矩阵的可能的压缩因子，所述复系数矩阵是根据所述终端设备选择的端口和所述频域基底矩阵确定的，所述压缩因子与传输层数有对应关系，所述传输层数是指所述终端设备向所述无线接入网设备上报的下行信道状态信息对应的可能的传输层数；
    所述无线接入网设备向所述终端设备发送参考信号；其中，所述第一指示信息、所述第二指示信息和所述参考信号用于所述终端设备确定所述下行信道状态信息。
  11. 根据权利要求10所述的方法，其特征在于，所述方法还包括：
    所述无线接入网设备接收来自于所述终端设备的所述下行信道状态信息；
    所述无线接入网设备根据所述下行信道状态信息确定预编码矩阵；
    所述无线接入网设备根据所述预编码矩阵对数据进行预编码。
  12. 根据权利要求10或11所述的方法，其特征在于，所述选择端口数为每个极化方向上所述终端设备用于进行端口选择的端口数。
  13. 根据权利要求10-12任一项所述的方法，其特征在于，所述第一指示信息通过第一表格中的第一索引实现，所述第一表格中包括至少一个所述选择端口数与至少一个所述压缩因子之间的对应关系，所述第一索引用于指示所述第一选择端口数和所述第一压缩因子；其中，不同的所述传输层数对应的所述压缩因子相同；或者，不同的所述传输层数中的至少两个传输层数对应的所述压缩因子不同。
  14. 根据权利要求10-13任一项所述的方法，其特征在于，所述第二指示信息还用于指示第一发送端口数，所述第一发送端口数为至少一个发送端口数中的一个，所述发送端口数为所述无线接入网设备发送所述参考信号的可能的端口数。
  15. 根据权利要求14所述的方法，其特征在于，所述第二指示信息通过第二表格中的第二索引实现，所述第二表格中包括至少一个所述发送端口数与至少一个所述DFT向量个数之间的对应关系，所述第二索引用于指示所述第一发送端口数和所述第一DFT向量个数。
  16. 根据权利要求15所述的方法，其特征在于，所述方法还包括：
    所述无线接入网设备向所述终端设备发送第二配置信息，所述第二配置信息用于配置所述第二表格。
  17. 根据权利要求10-13任一项所述的方法，其特征在于，所述第一指示信息和所述第二指示信息通过第一表格中的第一索引实现，所述第一表格中包括至少一个所述DFT向量个数、至少一个所述选择端口数和至少一个所述压缩因子之间的对应关系，所述第一索引用于指示所述第一DFT向量个数、所述第一选择端口数和所述第一压缩因子；其中，不同的所述传输层数对应的所述压缩因子相同；或者，不同的所述传输层数中的至少两个传输层数对应的所述压缩因子不同。
  18. 根据权利要求13或17所述的方法，其特征在于，所述方法还包括：
    所述无线接入网设备向所述终端设备发送第一配置信息，第一配置信息用于配置所述第 一表格。
  19. 根据权利要求10-18任一项所述的方法，其特征在于，所述DFT向量个数为1或2。
  20. 一种通信装置，其特征在于，包括：通信单元和处理单元；
    所述处理单元，用于通过所述通信单元接收来自于无线接入网设备的第一指示信息和第二指示信息，所述第一指示信息用于指示第一信息和第二信息，所述第二指示信息用于指示第一离散傅里叶变换DFT向量个数，所述第一DFT向量个数为至少一个DFT向量个数中的一个，所述DFT向量个数为频域基底矩阵包括的可能的DFT向量的个数，所述第一信息用于指示第一选择端口数，所述第一选择端口数为至少一个选择端口数中的一个，所述选择端口数为所述通信装置用于进行端口选择的可能的端口数，所述第二信息用于指示第一压缩因子，所述第一压缩因子为至少一个压缩因子中的一个，所述压缩因子为复系数矩阵的可能的压缩因子，所述复系数矩阵是根据所述通信装置选择的端口和所述频域基底矩阵确定的，所述压缩因子与传输层数有对应关系，所述传输层数是指所述通信装置向所述无线接入网设备上报的下行信道状态信息对应的可能的传输层数；
    所述处理单元，还用于通过所述通信单元接收来自于所述无线接入网设备的参考信号；
    所述处理单元，还用于根据所述第一指示信息、所述第二指示信息和所述参考信号，通过所述通信单元向所述无线接入网设备发送所述下行信道状态信息。
  21. 根据权利要求20所述的通信装置，其特征在于，所述选择端口数为每个极化方向上所述通信装置用于进行端口选择的端口数。
  22. 根据权利要求20或21所述的通信装置，其特征在于，所述第一指示信息通过第一表格中的第一索引实现，所述第一表格中包括至少一个所述选择端口数与至少一个所述压缩因子之间的对应关系，所述第一索引用于指示所述第一选择端口数和所述第一压缩因子；其中，不同的所述传输层数对应的所述压缩因子相同；或者，不同的所述传输层数中的至少两个传输层数对应的所述压缩因子不同。
  23. 根据权利要求20-22任一项所述的通信装置，其特征在于，所述第二指示信息还用于指示第一发送端口数，所述第一发送端口数为至少一个发送端口数中的一个，所述发送端口数为所述无线接入网设备发送所述参考信号的可能的端口数。
  24. 根据权利要求23所述的通信装置，其特征在于，所述第二指示信息通过第二表格中的第二索引实现，所述第二表格中包括至少一个所述发送端口数与至少一个所述DFT向量个数之间的对应关系，所述第二索引用于指示所述第一发送端口数和所述第一DFT向量个数。
  25. 根据权利要求24所述的通信装置，其特征在于，
    所述处理单元，还用于通过所述通信单元接收来自于所述无线接入网设备的第二配置信息，所述第二配置信息用于配置所述第二表格。
  26. 根据权利要求20或21所述的通信装置，其特征在于，所述第一指示信息和所述第二指示信息通过第一表格中的第一索引实现，所述第一表格中包括至少一个所述DFT向量个数、至少一个所述选择端口数和至少一个所述压缩因子之间的对应关系，所述第一索引用于指示所述第一DFT向量个数、所述第一选择端口数和所述第一压缩因子；其中，不同的所述传输层数对应的所述压缩因子相同；或者，不同的所述传输层数中的至少两个传输层数对应的所述压缩因子不同。
  27. 根据权利要求22或26所述的通信装置，其特征在于，
    所述处理单元，还用于通过所述通信单元接收来自于所述无线接入网设备的第一配置信息，所述第一配置信息用于配置所述第一表格。
  28. 根据权利要求20-27任一项所述的通信装置，其特征在于，所述DFT向量个数为1或2。
  29. 一种通信装置，其特征在于，包括：通信单元和处理单元；
    所述处理单元，用于通过所述通信单元向终端设备发送第一指示信息和第二指示信息，所述第一指示信息用于指示第一信息和第二信息，所述第二指示信息用于指示第一离散傅里叶变换DFT向量个数，所述第一DFT向量个数为至少一个DFT向量个数中的一个，所述DFT向量个数为频域基底矩阵包括的可能的DFT向量的个数，所述第一信息用于指示第一选择端口数，所述第一选择端口数为至少一个选择端口数中的一个，所述选择端口数为所述终端设备用于进行端口选择的可能的端口数，所述第二信息用于指示第一压缩因子，所述第一压缩因子为至少一个压缩因子中的一个，所述压缩因子为复系数矩阵的可能的压缩因子，所述复系数矩阵是根据所述终端设备选择的端口和所述频域基底矩阵确定的，所述压缩因子与传输层数有对应关系，所述传输层数是指所述终端设备向所述通信装置上报的下行信道状态信息对应的可能的传输层数；
    所述处理单元，还用于通过所述通信单元向所述终端设备发送参考信号；其中，所述第一指示信息、所述第二指示信息和所述参考信号用于所述终端设备确定所述下行信道状态信息。
  30. 根据权利要求29所述的通信装置，其特征在于，所述处理单元，还用于：
    通过所述通信单元接收来自于所述终端设备的所述下行信道状态信息；
    根据所述下行信道状态信息确定预编码矩阵；
    根据所述预编码矩阵对数据进行预编码。
  31. 根据权利要求29或30所述的通信装置，其特征在于，所述选择端口数为每个极化方向上所述终端设备用于进行端口选择的端口数。
  32. 根据权利要求29-31任一项所述的通信装置，其特征在于，所述第一指示信息通过第一表格中的第一索引实现，所述第一表格中包括至少一个所述选择端口数与至少一个所述压缩因子之间的对应关系，所述第一索引用于指示所述第一选择端口数和所述第一压缩因子；其中，不同的所述传输层数对应的所述压缩因子相同；或者，不同的所述传输层数中的至少两个传输层数对应的所述压缩因子不同。
  33. 根据权利要求29-32任一项所述的通信装置，其特征在于，所述第二指示信息还用于指示第一发送端口数，所述第一发送端口数为至少一个发送端口数中的一个，所述发送端口数为所述通信装置发送所述参考信号的可能的端口数。
  34. 根据权利要求33所述的通信装置，其特征在于，所述第二指示信息通过第二表格中的第二索引实现，所述第二表格中包括至少一个所述发送端口数与至少一个所述DFT向量个数之间的对应关系，所述第二索引用于指示所述第一发送端口数和所述第一DFT向量个数。
  35. 根据权利要求34所述的通信装置，其特征在于，
    所述处理单元，还用于通过所述通信单元向所述终端设备发送第二配置信息，所述第二配置信息用于配置所述第二表格。
  36. 根据权利要求29-32任一项所述的通信装置，其特征在于，所述第一指示信息和所述第二指示信息通过第一表格中的第一索引实现，所述第一表格中包括至少一个所述DFT向量个数、至少一个所述选择端口数和至少一个所述压缩因子之间的对应关系，所述第一索引用于指示所述第一DFT向量个数、所述第一选择端口数和所述第一压缩因子；其中，不同的所述传输层数对应的所述压缩因子相同；或者，不同的所述传输层数中的至少两个传输层数对 应的所述压缩因子不同。
  37. 根据权利要求32或36所述的通信装置，其特征在于，
    所述处理单元，还用于通过所述通信单元向所述终端设备发送第一配置信息，第一配置信息用于配置所述第一表格。
  38. 根据权利要求29-37任一项所述的通信装置，其特征在于，所述DFT向量个数为1或2。
  39. 一种通信装置，其特征在于，包括：处理器；
    所述处理器与存储器连接，所述存储器用于存储计算机执行指令，所述处理器执行所述存储器存储的所述计算机执行指令，以使所述通信装置实现如权利要求1-9任一项，或者，权利要求10-19任一项所述的方法。
  40. 一种计算机可读存储介质，其特征在于，包括计算机执行指令，当所述计算机执行指令在计算机上运行时，使得所述计算机执行如权利要求1-9任一项，或者，权利要求10-19任一项所述的方法。
  41. 一种处理器，其特征在于，用于执行如权利要求1-9任一项，或者，权利要求10-19任一项所述的方法。
  42. 一种芯片系统，其特征在于，包括：
    存储器，用于存储计算机程序；
    处理器，用于从所述存储器调用并运行所述计算机程序，使得安装有所述芯片系统的设备执行如权利要求1-9任一项，或者，权利要求10-19任一项所述的方法。
  43. 一种计算机程序产品，所述计算机程序产品包括计算机程序，当所述计算机程序在计算机上运行时，使得计算机执行如权利要求1-9任一项，或者，权利要求10-19任一项所述的方法。
PCT/CN2022/081019 2021-04-06 2022-03-15 信息传输方法及装置 Ceased WO2022213780A1 (zh)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020091543A1 (ko) * 2018-11-02 2020-05-07 엘지전자 주식회사 무선 통신 시스템에서 채널 상태 정보를 보고하기 위한 방법 및 이를 위한 장치
CN111277379A (zh) * 2019-01-11 2020-06-12 维沃移动通信有限公司 无线通信方法和终端设备

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113439394B (zh) * 2019-02-14 2024-12-13 苹果公司 多个空间层的ii型csi报告的方法
CN115152293B (zh) * 2020-02-14 2026-01-13 高通股份有限公司 信道状态信息(csi)报告中的信息的指示
US12567891B2 (en) * 2020-12-28 2026-03-03 Telefonaktiebolaget Lm Ericsson (Publ) Methods for reducing overhead of NR type II channel state information feedback using angle and delay reciprocity

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020091543A1 (ko) * 2018-11-02 2020-05-07 엘지전자 주식회사 무선 통신 시스템에서 채널 상태 정보를 보고하기 위한 방법 및 이를 위한 장치
CN111277379A (zh) * 2019-01-11 2020-06-12 维沃移动通信有限公司 无线通信方法和终端设备

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
ERICSSON: "CSI enhancements for Multi-TRP and FR1 FDD reciprocity", 3GPP DRAFT; R1-2101687, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. Online; 20210125 - 20210205, 19 January 2021 (2021-01-19), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , XP051971840 *
MODERATOR (HUAWEI, HISILICON): "Summary of CSI enhancements for MTRP and FDD (Round 0)", 3GPP DRAFT; R1-2101884, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. E-meeting; 20210125 - 20210205, 27 January 2021 (2021-01-27), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , XP051975967 *
MODERATOR (HUAWEI, HISILICON): "Summary of CSI enhancements for MTRP and FDD (Round 3)", 3GPP DRAFT; R1-2102061, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. E-meeting; 20210125 - 20210205, 3 February 2021 (2021-02-03), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP052170865 *
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