WO2020073788A1 - Procédé d'indication et de détermination de vecteur de précodage et dispositif de communication - Google Patents

Procédé d'indication et de détermination de vecteur de précodage et dispositif de communication Download PDF

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Publication number
WO2020073788A1
WO2020073788A1 PCT/CN2019/106998 CN2019106998W WO2020073788A1 WO 2020073788 A1 WO2020073788 A1 WO 2020073788A1 CN 2019106998 W CN2019106998 W CN 2019106998W WO 2020073788 A1 WO2020073788 A1 WO 2020073788A1
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Prior art keywords
vector
vectors
phase
amplitude
phase component
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PCT/CN2019/106998
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English (en)
Chinese (zh)
Inventor
尹海帆
王潇涵
金黄平
毕晓艳
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华为技术有限公司
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Publication of WO2020073788A1 publication Critical patent/WO2020073788A1/fr

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    • 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
    • H04B7/0408—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas using two or more beams, i.e. beam diversity
    • 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
    • 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
    • H04B7/0452—Multi-user MIMO systems
    • 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
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • 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
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals

Definitions

  • the present application relates to the field of wireless communication, and more specifically, to a method and communication device for indicating and determining a precoding vector.
  • Massive MIMO massive multiple-input multiple-output
  • network equipment can reduce interference between multiple users and interference between multiple signal streams of the same user through precoding. It is conducive to improving signal quality, realizing space division multiplexing, and improving spectrum utilization.
  • the terminal device may determine the precoding vector by way of channel measurement, for example, and hopes that through feedback, the network device obtains the same or similar precoding vector as the precoding vector.
  • the terminal device may indicate the precoding vector to the network device through a two-stage feedback method of broadband feedback and subband feedback. Specifically, the terminal device may indicate the selected beam vector and the quantized value of the broadband amplitude coefficient of each beam vector through wideband feedback based on each transmission layer, and may indicate the quantization of the combined coefficients available for each subband through subband feedback Value, where the combination coefficient may include, for example, a sub-band amplitude coefficient and a sub-band phase coefficient.
  • the network device can synthesize the information fed back by the broadband and the information fed back by the subband to recover a precoding matrix that is close to the ideal precoding matrix.
  • the present application provides a method and a communication device for indicating and determining a precoding vector, in order to reduce feedback overhead.
  • a method for indicating a precoding vector is provided.
  • the method may be executed by a terminal device, or may be executed by a chip configured in the terminal device.
  • the method includes: generating first indication information; and sending the first indication information.
  • the first indication information is used to indicate L beam vectors, one or more amplitude component vectors corresponding to each beam vector and weighting coefficients of the amplitude component vectors, and one or more phase component vectors corresponding to each beam vector And the weighting coefficient of each phase component vector.
  • One or more amplitude component vectors corresponding to the lth beam vector and weighting coefficients of the amplitude component vectors are used to construct the amplitude vector of the lth beam vector, and one or more phase component vectors corresponding to the lth beam vector
  • the weighting coefficients of each phase component vector are used to construct the phase vector of the l-th beam vector.
  • the amplitude vector of the lth beam vector and the phase vector of the lth beam vector are used to determine the weighting coefficient vector of the lth beam vector.
  • the weighting coefficient vector includes N sb elements, and the n sb element in the weighting coefficient vector is the weighting coefficient of the lth beam vector on the n sb subband.
  • the L beam vectors and the weighting coefficients of the L beam vectors on the n sb subband are used to construct a precoding vector corresponding to the n sb subband.
  • the l th beam vectors of any vector beams L a, 0 ⁇ n sb ⁇ N sb -1,0 ⁇ l ⁇ L-1 , n sb and l is an integer, L is a positive integer and N sb.
  • the terminal device can feed back the weighting coefficient of each beam vector in each subband to the network device through the amplitude component vector and its weighting coefficient, the phase component vector and its weighting coefficient.
  • the weighted sum of the amplitude component vectors corresponding to each beam vector can be used to determine the amplitude coefficients of a beam vector in multiple subbands
  • the weighted sum of the phase component vectors corresponding to each beam vector can be used to determine a beam vector in multiple subbands 'S phase coefficient. Therefore, the network device can determine the weighting coefficient of each beam vector on each subband according to the amplitude component vector and its weighting coefficient, phase component vector and its weighting coefficient indicated by the terminal device, and then determine the precoding vector of each subband .
  • this feedback method can be understood as a sub-band joint feedback method.
  • the terminal device does not need to make separate feedback on the amplitude coefficient and phase coefficient of each subband.
  • the weighted sum of one or more amplitude component vectors and the weighted sum of one or more phase component vectors are used to approximately represent the amplitude vector and phase vector of each beam vector. Compression, on the basis of ensuring approximate accuracy, greatly reduces the feedback overhead.
  • the method further includes: receiving second indication information, where the second indication information is used to indicate an amplitude component corresponding to each of the L beam vectors The number of vectors.
  • the number of the amplitude component vectors can be indicated by the network device.
  • the method further includes: receiving second indication information, where the second indication information is used to indicate an amplitude component corresponding to each of the L beam vectors The number of vectors.
  • the number of the amplitude component vectors can be determined and reported by the terminal device.
  • amplitude component vectors can also be defined in advance, as defined by the protocol. This application does not limit this.
  • the number of amplitude component vectors corresponding to any two beam vectors in the L beam vectors is the same, or the number of amplitude component vectors corresponding to at least two beam vectors in the L beam vectors is different.
  • the second indication information may only indicate the number of amplitude component vectors once; when the amplitude of at least two beam vectors among the L beam vectors When the number of component vectors is different, the second indication information may indicate the number of amplitude component vectors once for each beam vector.
  • the method further includes: receiving third indication information, where the third indication information is used to indicate a phase component corresponding to each of the L beam vectors The number of vectors.
  • the method further includes: sending third indication information, where the third indication information is used to indicate a phase component corresponding to each of the L beam vectors The number of vectors.
  • phase component vectors may also be defined in advance, as defined by the protocol. This application does not limit this.
  • the number of phase component vectors corresponding to any two beam vectors in the L beam vectors is the same, or the number of phase component vectors corresponding to at least two beam vectors in the L beam vectors is different.
  • the third indication information may only indicate the number of phase component vectors once; when the phase of at least two beam vectors among the L beam vectors When the number of component vectors is different, the third indication information may indicate the number of phase component vectors once for each beam vector.
  • the method further includes: receiving fourth indication information, where the fourth indication information is used to indicate the length of the amplitude component vector or the length of the phase component vector N sb .
  • the length of the amplitude component vector and the length of the phase component vector may be the same. Therefore, when the length of any item is determined, the length of the other item can also be determined.
  • a method for determining a precoding vector is provided.
  • the method may be executed by a network device, or may be executed by a chip configured in the network device.
  • the method includes: receiving first indication information, which is used to indicate L beam vectors, one or more amplitude component vectors corresponding to each beam vector, and weighting coefficients of the amplitude component vectors, and One or more phase component vectors corresponding to each beam vector and weighting coefficients of each phase component vector.
  • One or more amplitude component vectors corresponding to the lth beam vector and weighting coefficients of the amplitude component vectors are used to construct the amplitude vector of the lth beam vector, and one or more phase component vectors corresponding to the lth beam vector
  • the weighting coefficients of each phase component vector are used to construct the phase vector of the l-th beam vector.
  • the amplitude vector of the l-th beam vector and the phase vector of the l-th beam vector are used to determine the weighting coefficient vector of the l-th beam vector.
  • the weighting coefficient vector includes N sb elements, and the n sb element in the weighting coefficient vector is the weighting coefficient of the lth beam vector on the n sb subband.
  • the L beam vectors and the weighting coefficients of the L beam vectors on the n sb subband are used to construct a precoding vector corresponding to the n sb subband.
  • the l th beam vectors of any vector beams L a, 0 ⁇ n sb ⁇ N sb -1,0 ⁇ l ⁇ L-1 , n sb and l is an integer, L is a positive integer and N sb.
  • the precoding vector of at least one subband among the N sb subbands is determined according to the first indication information.
  • the terminal device can feed back the weighting coefficient of each beam vector in each subband to the network device through the amplitude component vector and its weighting coefficient, the phase component vector and its weighting coefficient.
  • the weighted sum of the amplitude component vectors corresponding to each beam vector can be used to determine the amplitude coefficients of a beam vector in multiple subbands
  • the weighted sum of the phase component vectors corresponding to each beam vector can be used to determine a beam vector in multiple subbands 'S phase coefficient. Therefore, the network device can determine the weighting coefficient of each beam vector on each subband according to the amplitude component vector and its weighting coefficient, phase component vector and its weighting coefficient indicated by the terminal device, and then determine the precoding vector of each subband .
  • this feedback method can be understood as a sub-band joint feedback method.
  • the terminal device does not need to make separate feedback on the amplitude coefficient and phase coefficient of each subband.
  • the weighted sum of one or more amplitude component vectors and the weighted sum of one or more phase component vectors are used to approximately represent the amplitude vector and phase vector of each beam vector. Compression, on the basis of ensuring approximate accuracy, greatly reduces the feedback overhead.
  • the method further includes: sending second indication information, where the second indication information is used to indicate an amplitude component corresponding to each of the L beam vectors The number of vectors.
  • the number of the amplitude component vectors can be indicated by the network device.
  • the method further includes: receiving second indication information, where the second indication information is used to indicate an amplitude component corresponding to each of the L beam vectors The number of vectors.
  • the number of the amplitude component vectors can be determined and reported by the terminal device.
  • amplitude component vectors can also be defined in advance, as defined by the protocol. This application does not limit this.
  • the number of amplitude component vectors corresponding to any two beam vectors in the L beam vectors is the same, or the number of amplitude component vectors corresponding to at least two beam vectors in the L beam vectors is different.
  • the second indication information may only indicate the number of amplitude component vectors once; when the amplitude of at least two beam vectors among the L beam vectors When the number of component vectors is different, the second indication information may indicate the number of amplitude component vectors once for each beam vector.
  • the method further includes: sending third indication information, where the third indication information is used to indicate a phase component corresponding to each of the L beam vectors The number of vectors.
  • the method further includes: receiving third indication information, where the third indication information is used to indicate a phase component corresponding to each of the L beam vectors The number of vectors.
  • phase component vectors may also be defined in advance, as defined by the protocol. This application does not limit this.
  • the number of phase component vectors corresponding to any two beam vectors in the L beam vectors is the same, or the number of phase component vectors corresponding to at least two beam vectors in the L beam vectors is different.
  • the third indication information may only indicate the number of phase component vectors once; when the phase of at least two beam vectors among the L beam vectors When the number of component vectors is different, the third indication information may indicate the number of phase component vectors once for each beam vector.
  • the method further includes: sending fourth indication information, where the fourth indication information is used to indicate the length of the amplitude component vector or the length of the phase component vector N sb .
  • the length of the amplitude component vector and the length of the phase component vector may be the same. Therefore, if the length of any item is determined, the length of the other item can also be determined.
  • the number of amplitude component vectors corresponding to any two beam vectors among the L beam vectors is the same, and the phase component vectors corresponding to any two beam vectors are the same The number is the same.
  • the second indication information may only indicate the number of amplitude component vectors once, and the third indication information may only indicate the number of phase component vectors once.
  • the amplitude component vector corresponding to the first beam vector is the same as the amplitude component vector corresponding to the second beam vector, and the first beam vector And the second beam vector are any two beam vectors among the L beam vectors.
  • the number of the amplitude component of the vector referred to as K a, K a positive integer. That is, the L-beams to share the same vector K a magnitude of a component of the vector.
  • the vector may be directed to the L-beam once only indicates that the amplitude of a component of the vector K a.
  • the amplitude component vector corresponding to the first beam vector is the same as the amplitude component vector corresponding to the second beam vector
  • the first beam The phase component vector corresponding to the vector is the same as the phase component vector corresponding to the second beam vector
  • the first beam vector and the second beam vector are any two beam vectors among the L beam vectors.
  • the number of the amplitude component of the vector referred to as K a, K a positive integer
  • the number of the phase component of the vector referred to as K p
  • K p is a positive integer. That is, the L-beams to share the same vector K a magnitude of a component of the vector, and may share the same phase component vectors K p.
  • the vector may be directed beams L are indicative of the time a K a vector of amplitude components; in each beam for indicating When one or more phase component vectors correspond to the vector, the K p phase component vectors can be indicated only once for the L beam vectors.
  • the length N sb of the amplitude component vector is: the channel state information (channel state information, CSI) measurement resource allocated to the terminal device in the frequency domain occupies bandwidth (frequency domain occupation of a CSI measurement resource) includes the number of subbands; or the length of signaling used to indicate the position and number of subbands to be reported; or the number of subbands to be reported.
  • the channel state information channel state information, CSI
  • the frequency domain occupied bandwidth of the CSI measurement resource may also be referred to as pilot transmission bandwidth, or measurement bandwidth.
  • the bandwidth occupied by the CSI measurement resource in the frequency domain can be understood as the bandwidth used to transmit a reference signal, and the reference signal is a reference signal used for channel measurement, such as a CSI reference signal (reference signal (RS)).
  • RS reference signal
  • the signaling used to indicate the frequency domain occupied bandwidth of the CSI measurement resource may be, for example, a CSI occupied bandwidth range (CSI-Frequency Occupation).
  • the signaling used to indicate the position and number of subbands to be reported may be, for example, reporting bandwidth.
  • one or more amplitude component vectors corresponding to each beam vector are taken from an amplitude component vector set, and the first indication information is used to indicate the one Or multiple amplitude component vectors, specifically used to indicate the index of the one or more amplitude component vectors in the amplitude component vector set.
  • the first indication information may also indicate the amplitude component vectors selected in the amplitude component vector set.
  • one or more amplitude component vectors corresponding to each beam vector are taken from a subset of the amplitude component vector set, and the amplitude component vector set includes Multiple amplitude component vectors.
  • the first indication information is used to indicate the one or more amplitude component vectors, it is specifically used to indicate the subset and the index of the one or more amplitude component vectors in the subset.
  • the set of amplitude component vectors can be expanded into multiple subsets by an oversampling factor.
  • the first indication information may be used to indicate the subset to which the selected one or more amplitude component vectors belong and the index in the subset.
  • one or more phase component vectors corresponding to each beam vector are taken from a set of phase component vectors, and the first indication information is used to indicate the one Or multiple phase component vectors, specifically used to indicate the index of the one or more phase component vectors in the set of phase component vectors.
  • the first indication information may also indicate the selected phase component vectors in the phase component vector set.
  • one or more phase component vectors corresponding to each beam vector are taken from a subset of the phase component vector set, and the phase component vector set includes Multiple phase component vectors.
  • the first indication information is used to indicate the one or more phase component vectors, it is specifically used to indicate the subset and the index of the one or more phase component vectors in the subset.
  • the set of phase component vectors can also be expanded into multiple subsets by an oversampling factor.
  • the first indication information may be used to indicate the subset to which the selected one or more phase component vectors belong and the index in the subset.
  • the plurality of column vectors included in the set of phase component vectors are taken from a discrete Fourier transform DFT matrix or an oversampled DFT matrix; or, the phase component Each column vector in the vector set includes multiple phase angles.
  • each phase component vector is determined by a set of phase angles, and each set of phase angles is used to determine one phase component vector, and each set of phase angles includes multiple phases Angle, and a plurality of phase angles in each group of phase angles constitute an arithmetic sequence, and the tolerance of the arithmetic sequence constituted by any two sets of phase angles is different.
  • the first indication information when used to indicate the one or more phase component vectors, it may be used to indicate the index of the combination of the pair of one or more phase component vectors, or, the one or more component vectors The index of the subset to which it belongs and the combination in that subset.
  • the phase vector of each beam vector is represented by a phase component vector, that is, the weighting coefficient of the phase component vector is 1.
  • the first indication information is used to indicate the phase component vector of each beam vector, it is specifically used to indicate at least two of the first phase angle, the last phase angle and the tolerance of each group of phase angles in one or more groups of phase angles item.
  • the first indication information indicates the first phase angle and the last phase angle of each group of phase angles, it may further indicate the number of cycles between the last phase angle and the first phase angle.
  • the terminal device can indicate the phase vector of each beam vector by linear fitting.
  • the network device can restore the phase vector of each beam vector through linear interpolation.
  • a communication device including various modules or units for performing the method in any possible implementation manner of the first aspect.
  • a communication device including a processor.
  • the processor is coupled to the memory and can be used to execute instructions in the memory to implement the method in any possible implementation manner of the first aspect.
  • the communication device further includes a memory.
  • the communication device further includes a communication interface, and the processor is coupled to the communication interface.
  • the communication device is a terminal device.
  • the communication interface may be a transceiver or an input / output interface.
  • the communication device is a chip configured in the terminal device.
  • the communication interface may be an input / output interface.
  • the transceiver may be a transceiver circuit.
  • the input / output interface may be an input / output circuit.
  • a communication device including various modules or units for performing the method in any possible implementation manner of the second aspect.
  • a communication device including a processor.
  • the processor is coupled to the memory and can be used to execute instructions in the memory to implement the method in any possible implementation manner of the second aspect.
  • the communication device further includes a memory.
  • the communication device further includes a communication interface, and the processor is coupled to the communication interface.
  • the communication device is a network device.
  • the communication interface may be a transceiver or an input / output interface.
  • the communication device is a chip configured in a network device.
  • the communication interface may be an input / output interface.
  • the transceiver may be a transceiver circuit.
  • the input / output interface may be an input / output circuit.
  • a processor including: an input circuit, an output circuit, and a processing circuit.
  • the processing circuit is configured to receive an input signal through the input circuit and output a signal through the output circuit so that the processor performs the first aspect or the second aspect and any possible implementation of the first aspect or the second aspect The way in the way.
  • the processor may be a chip
  • the input circuit may be an input pin
  • the output circuit may be an output pin
  • the processing circuit may be a transistor, a gate circuit, a flip-flop, and various logic circuits.
  • the input signal received by the input circuit may be received and input by, for example, but not limited to, the receiver
  • the signal output by the output circuit may be, for example, but not limited to, output to and transmitted by the transmitter
  • the circuit may be the same circuit, which is used as an input circuit and an output circuit at different times, respectively.
  • the embodiments of the present application do not limit the specific implementation manner of the processor and various circuits.
  • a processing device including a processor and a memory.
  • the processor is used to read instructions stored in the memory, and can receive signals through the receiver and transmit signals through the transmitter to perform the first aspect or the second aspect and any possible implementation manner of the first aspect or the second aspect Methods.
  • processors there are one or more processors and one or more memories.
  • the memory may be integrated with the processor, or the memory and the processor are provided separately.
  • the memory may be non-transitory (non-transitory) memory, such as read-only memory (read only memory, ROM), which may be integrated with the processor on the same chip, or may be set in different On the chip, the embodiments of the present application do not limit the type of memory and the manner of setting the memory and the processor.
  • non-transitory memory such as read-only memory (read only memory, ROM)
  • ROM read only memory
  • sending instruction information may be a process of outputting instruction information from the processor
  • receiving capability information may be a process of receiving input capability information by the processor.
  • the processed output data may be output to the transmitter, and the input data received by the processor may come from the receiver.
  • the transmitter and the receiver may be collectively referred to as a transceiver.
  • the processing device in the eighth aspect may be a chip, and the processor may be implemented by hardware or software.
  • the processor When implemented by hardware, the processor may be a logic circuit, an integrated circuit, etc .; when implemented by software
  • the processor may be a general-purpose processor, implemented by reading software codes stored in a memory, the memory may be integrated in the processor, or may be located outside the processor and exist independently.
  • a computer program product includes: a computer program (also referred to as code or instructions) that, when the computer program is executed, causes the computer to perform the first aspect or the above The method in the second aspect and any possible implementation manner of the first aspect or the second aspect.
  • a computer program also referred to as code or instructions
  • a computer-readable medium that stores a computer program (also may be referred to as code or instructions) that when executed on a computer, causes the computer to perform the first aspect or the above
  • a computer program also may be referred to as code or instructions
  • a communication system including the foregoing network device and terminal device.
  • FIG. 1 is a schematic diagram of a communication system applicable to the method for indicating and determining a precoding vector provided by an embodiment of the present application;
  • FIG. 2 is a schematic flowchart of a method for indicating and determining a precoding vector provided by an embodiment of the present application
  • FIG. 3 is a schematic flowchart of generating first indication information by a terminal device according to an embodiment of the present application
  • FIG. 4 is a schematic block diagram of a communication device provided by an embodiment of the present application.
  • FIG. 5 is a schematic structural diagram of a terminal device provided by an embodiment of the present application.
  • FIG. 6 is a schematic structural diagram of a network device provided by an embodiment of the present application.
  • GSM global mobile communication
  • CDMA code division multiple access
  • WCDMA broadband code division multiple access
  • general packet radio service general packet radio service, GPRS
  • LTE long term evolution
  • LTE frequency division duplex FDD
  • TDD time division duplex
  • UMTS universal mobile communication system
  • global interconnected microwave access worldwide interoperability for microwave access, WiMAX
  • FIG. 1 is a schematic diagram of a communication system 100 suitable for a method of indicating a precoding vector according to an embodiment of the present application.
  • the communication system 100 may include at least one network device, such as the network device 110 shown in FIG. 1; the communication system 100 may also include at least one terminal device, such as the terminal device 120 shown in FIG. 1.
  • the network device 110 and the terminal device 120 can communicate through a wireless link.
  • Each communication device, such as the network device 110 or the terminal device 120 may be configured with multiple antennas.
  • the configured multiple antennas may include at least one transmit antenna for transmitting signals and at least one receive antenna for receiving signals. Therefore, the communication devices in the communication system 100, such as the network device 110 and the terminal device 120, can communicate through multi-antenna technology.
  • the network device in the communication system may be any device with wireless transceiver function.
  • the network equipment includes but is not limited to: evolved Node B (evolved Node B, eNB), radio network controller (radio network controller, RNC), node B (Node B, NB), base station controller (base station controller, BSC) ), Base transceiver station (BTS), home base station (eg, home evolved NodeB, or home Node B, HNB), baseband unit (BBU), wireless fidelity (WiFi) system Access point (AP), wireless relay node, wireless backhaul node, transmission point (transmission point, TP) or sending and receiving point (transmission and reception point, TRP), etc.
  • 5G such as, NR, gNB in the system, or transmission point (TRP or TP), one or a group (including multiple antenna panels) of the base station in the 5G system, or it can also be a network node that constitutes a gNB or transmission point ,
  • NR gNB
  • gNB may include a centralized unit (CU) and DU.
  • the gNB may also include a radio unit (RU).
  • CU implements some functions of gNB
  • DU implements some functions of gNB, for example, CU implements radio resource control (RRC), packet data convergence layer protocol (packet data convergence protocol, PDCP) layer functions, DU implements wireless chain Road control (radio link control, RLC), media access control (media access control, MAC) and physical (physical, PHY) layer functions.
  • RRC radio resource control
  • PDCP packet data convergence layer protocol
  • DU implements wireless chain Road control (radio link control, RLC), media access control (media access control, MAC) and physical (physical, PHY) layer functions.
  • the network device may be a CU node, or a DU node, or a device including a CU node and a DU node.
  • the CU can be divided into network devices in the radio access network (RAN), and can also be divided into network devices in the core network (CN), which is not limited in this application.
  • RAN radio access network
  • CN core network
  • the terminal equipment in the wireless communication system may also be referred to as user equipment (UE), access terminal, subscriber unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, User terminal, terminal, wireless communication device, user agent or user device.
  • the terminal devices in the embodiments of the present application may be mobile phones, tablet computers, computers with wireless transceiver functions, virtual reality (VR) terminal devices, and augmented reality (AR) terminals Wireless terminals in equipment, industrial control (industrial control), wireless terminals in self-driving (self-driving), wireless terminals in remote medical (remote medical), wireless terminals in smart grid (smart grid), transportation safety ( wireless terminals in transportation, wireless terminals in smart cities, wireless terminals in smart homes, etc.
  • the embodiments of the present application do not limit the application scenarios.
  • FIG. 1 is only a simplified schematic diagram for ease of understanding and examples.
  • the communication system 100 may further include other network devices or other terminal devices, which are not shown in FIG. 1.
  • the processing procedure of the downlink signal at the physical layer before sending may be performed by a network device, or may be performed by a chip configured in the network device. For ease of explanation, they are collectively referred to as network devices below.
  • Network devices can process codewords on physical channels.
  • the codeword may be coded bits that have been coded (eg, including channel coding).
  • the scrambling of the codeword generates scrambling bits.
  • the scrambled bits undergo modulation mapping to obtain modulation symbols.
  • the modulation symbols are mapped to multiple layers (layers) through layer mapping, or transmission layers.
  • the modulation symbols after layer mapping are subjected to precoding to obtain a precoded signal.
  • the pre-encoded signal is mapped to multiple REs after being mapped to resource elements (RE). These REs are then orthogonally multiplexed (orthogonal frequency division multiplexing, OFDM) modulated and transmitted through the antenna port.
  • OFDM orthogonally multiplexed
  • the network device can process the signal to be transmitted with the help of a precoding matrix that matches the channel resource when the channel state is known, so that the precoded signal to be transmitted is adapted to the channel, thereby Reduces the complexity of the receiving device to eliminate the influence between channels. Therefore, through the precoding process of the signal to be transmitted, the received signal quality (for example, signal to interference plus noise ratio (SINR), etc.) can be improved. Therefore, by using precoding technology, transmission devices and multiple receiving devices can be transmitted on the same time-frequency resources, that is, multiple users, multiple inputs, and multiple outputs (MU-MIMO).
  • SINR signal to interference plus noise ratio
  • the sending device may also perform precoding in other ways. For example, when the channel matrix cannot be obtained, pre-coding is performed using a pre-coding matrix or a weighting processing method set in advance. For the sake of brevity, the specific content of this article will not be repeated here.
  • Precoding matrix indicator can be used to indicate the precoding matrix.
  • the precoding matrix may be a precoding matrix determined by the terminal device based on the channel matrix of each subband.
  • the channel matrix may be determined by the terminal device through channel estimation or the like or based on channel reciprocity.
  • the precoding matrix determined by the terminal device is turned into an ideal precoding matrix.
  • the vector in the ideal precoding matrix may be called an ideal precoding vector.
  • the network device may perform channel measurement in advance by sending a reference signal to the terminal device, and determine an ideal precoding vector for each subband based on the channel matrix of each subband.
  • the terminal device may perform singular value decomposition (SVD) on the channel matrix H or the covariance matrix HH H of the channel matrix to determine the ideal precoding matrix of the subband.
  • the terminal device may also perform eigenvalue decopomsition (EVD) on the covariance matrix HH H of the channel matrix to determine the ideal precoding matrix of the subband.
  • SVD singular value decomposition
  • EVD eigenvalue decopomsition
  • the PMI fed back by the terminal device may also be different, and the precoding matrix determined by the network device based on the PMI may also be different.
  • the terminal device may determine each of the reference signals received on each resource block (RB) in a certain subband, such as the channel state information reference signal (CSI-RS). The channel matrix on the RB, and then average the channel matrix on each RB to obtain the channel matrix of this subband. Thereafter, the terminal device may determine the ideal precoding matrix of each subband by performing SVD on the channel matrix of each subband or the covariance matrix of the channel matrix or performing EVD on the covariance matrix of the channel matrix of each subband.
  • CSI-RS channel state information reference signal
  • the terminal device After the terminal device performs SVD on the channel matrix H, it can obtain:
  • U and V H are unitary matrices
  • S is a diagonal matrix
  • its non-zero elements that is, the elements on the diagonal
  • the singular values can usually be in order from large to small arrangement.
  • the conjugate transpose V of the right unitary matrix V H is the ideal precoding matrix.
  • the ideal precoding matrix is the precoding matrix calculated according to the channel matrix H.
  • the terminal device can quantize each element of the ideal precoding matrix of each subband, and feed back the quantized value to the sending device through the PMI, so that the network device determines the ideal precoding matrix approximate to each subband according to the PMI Precoding matrix.
  • the network device can directly determine the precoding matrix of each subband according to the PMI, or determine the precoding matrix of each subband according to the PMI and then perform further processing, such as precoding matrix (or precoding vector) of different users. Orthogonal processing, etc., to determine the final precoding matrix for each subband. In this way, the network device can determine the precoding matrix suitable for the channel of each subband and perform precoding processing on the signal to be transmitted.
  • the specific method for the network device to determine the precoding matrix of each subband according to the PMI can refer to the prior art, and here is an example for ease of understanding, and should not constitute any limitation to this application.
  • the following shows a simple example of a precoding matrix through two-stage feedback when the rank is 1.
  • W represents a transmission layer, a subband, and a precoding matrix to be fed back in two polarization directions.
  • W 1 can be fed back through broadband
  • W 2 can be fed back through subband.
  • v 0 to v 3 are beam vectors included in W 1 , and the plurality of beam vectors may be indicated by an index of a combination of the plurality of beam vectors, for example.
  • the precoding matrix shown above the beam vectors in the two polarization directions are the same, and beam vectors v 0 to v 3 are used.
  • a 0 to a 7 are the broadband amplitude coefficients included in W 1 , and can be indicated by the quantized value of the broadband amplitude coefficients.
  • c 0 to c 7 are the sub-band coefficients included in W 2 , and each sub-band coefficient may include a sub-band amplitude coefficient and a sub-band phase coefficient.
  • c 0 to c 7 may include sub-band amplitude coefficients ⁇ 0 to ⁇ 7 and sub-band phase coefficients to And can pass the quantized values of sub-band amplitude coefficients ⁇ 0 to ⁇ 7 and the sub-band phase coefficients to Quantized value to indicate.
  • the precoding matrix shown above is obtained based on feedback from one transmission layer, and therefore may also be referred to as a precoding vector.
  • the terminal device may separately feedback based on each transmission layer.
  • the precoding vectors fed back from each transmission layer can be constructed to obtain a subband precoding matrix.
  • the number of transmission layers is 4, and the precoding matrix may include 4 precoding vectors, respectively corresponding to 4 transmission layers.
  • the feedback overhead of the terminal equipment also increases. For example, when the number of transmission layers is 4, the feedback overhead of a 0 to a 7 and c 0 to c 7 will be up to 4 times that of one transmission layer. That is to say, if the terminal device performs broadband feedback and subband feedback as described above based on each transmission layer, as the number of transmission layers increases, the feedback overhead caused will increase exponentially. The greater the number of subbands, the greater the increase in feedback overhead. Therefore, it is desirable to provide a method that can reduce the feedback overhead of PMI.
  • the terminal device may also feed back the channel matrix to the network device through PMI.
  • the network device may determine the channel matrix according to the PMI, and then determine the precoding matrix, which is not limited in this application.
  • the precoding vector may refer to a vector in the precoding matrix, for example, a column vector.
  • the precoding matrix may be determined by precoding vectors of one or more transmission layers, and each vector in the precoding matrix may correspond to a transmission layer. Assuming that the dimension of the precoding vector can be N 1 ⁇ 1, if the number of transmission layers is R (R is a positive integer), the dimension of the precoding matrix can be N 1 ⁇ R.
  • the number of transmission layers may be determined by a rank indicator (RI), N 1 may represent the number of antenna ports, and N 1 is a positive integer.
  • the precoding vector may also refer to the components of the precoding matrix in one transmission layer and one polarization direction. Assuming that the number of polarization directions is P (P is a positive integer) and the number of antenna ports in one polarization direction is N 2 , then the dimension of the precoding vector corresponding to one transmission layer is (P ⁇ N 2 ) ⁇ 1, then one The dimension of the precoding vector in the polarization direction may be N 2 ⁇ 1, and N 2 is a positive integer.
  • the precoding vector may correspond to one transmission layer, or may correspond to one polarization direction on one transmission layer.
  • Antenna port can be referred to as port. It can be understood as a transmitting antenna recognized by the receiving device, or a transmitting antenna that can be distinguished in space.
  • One antenna port can be configured for each virtual antenna, each virtual antenna can be a weighted combination of multiple physical antennas, and each antenna port can correspond to a reference signal, therefore, each antenna port can be referred to as a reference signal port For example, CSI-RS port, sounding reference signal (SRS) port, etc.
  • SRS sounding reference signal
  • Beam can be understood as the distribution of signal strength formed in a certain direction in space.
  • the technique of forming a beam may be a beam forming (or beamforming) technique or other techniques.
  • the beamforming technology may specifically be a digital beamforming technology, an analog beamforming technology, and a hybrid digital / analog beamforming technology.
  • the beam may be formed by digital beamforming technology.
  • the beam vector may be a precoding vector in the precoding matrix or a beam forming vector.
  • Each element in the beam vector may represent the weight of each antenna port.
  • the weighted signals of each antenna port are superimposed on each other to form an area with strong signal strength.
  • the beam can be obtained by linearly superimposing multiple beam vectors through the beamforming technique.
  • Amplitude vector a vector used to represent the variation rule of the amplitude of the weighting coefficient of each beam vector on each subband as proposed in the embodiment of the present application. Among them, each beam vector and its weighting coefficient on each subband can be used to construct the precoding vector of each subband.
  • the length (or dimension) of the amplitude vector is the number of subbands included in the pilot transmission bandwidth allocated to the terminal device.
  • the frequency domain occupied bandwidth of the CSI measurement resource is also called pilot transmission bandwidth, or, measurement bandwidth.
  • the bandwidth occupied by the CSI measurement resource in the frequency domain may be a bandwidth used to transmit a reference signal, and the reference signal referred to herein may be a reference signal used for channel measurement, such as CSI-RS.
  • the frequency domain occupied bandwidth used to indicate the CSI measurement resource may be, for example, the CSI occupied bandwidth range (CSI-Frequency Occupation).
  • the length of the amplitude vector is the length of signaling used to indicate the position and number of subbands to be reported.
  • the signaling used to indicate the position and number of subbands to be reported may be reporting bandwidth (reporting bandwidth).
  • the signaling can indicate the position and number of subbands to be reported in the form of a bitmap. Therefore, the dimension of the amplitude vector can be the number of bits in the bitmap. It should be understood that reporting is only a possible nomenclature for this signaling, and should not be subject to any limitations on the composition of this application. This application does not exclude the possibility of naming the signaling by other names to achieve the same or similar functions.
  • the length of the amplitude vector is the number of subbands to be reported.
  • the number of sub-bands to be reported may be indicated by the signaling bandwidth reporting.
  • the number of subbands to be reported may be all subbands in the bandwidth occupied by the frequency domain of the CSI measurement resource, or part of the subbands in the bandwidth occupied by the frequency domain of the CSI measurement resource; or, the subbands to be reported
  • the number can be the same as the signaling length of the reported bandwidth, or it can be less than the signaling length of the reported bandwidth. This application does not limit this.
  • the amplitude vector may be a column vector with a dimension of N sb ⁇ 1, or a row vector with a dimension of 1 ⁇ N sb . This application does not limit this.
  • Phase vector a vector used to represent the phase change rule of the weighting coefficient of each beam vector in each subband as proposed in the embodiment of the present application.
  • the length of the phase vector and the length of the amplitude vector may be the same.
  • the length of the phase vector is the number of subbands included in the frequency domain occupied bandwidth of the CSI measurement resource allocated to the terminal device.
  • the length of the phase vector is the length of signaling used to indicate the position and number of subbands to be reported.
  • the length of the phase vector is the number of subbands to be reported.
  • the length of the phase vector and the amplitude vector can be the same, the length of the phase vector can also be N sb . Then the phase vector may be a column vector with a dimension of N sb ⁇ 1, or a row vector with a dimension of 1 ⁇ N sb . This application does not limit this.
  • the terminal device wants to be able to indicate the precoding matrix that is most similar to the ideal precoding matrix to the network device.
  • network devices can transmit data to terminal devices through multiple transmission layers.
  • the overhead caused by the terminal device performing feedback based on each transmission layer will also increase exponentially.
  • this application provides a method for indicating and determining a precoding vector, in order to reduce the feedback overhead of PMI.
  • the number of polarization directions of the transmitting antenna is P (P ⁇ 1 and an integer)
  • the number of transmission layers is R (R ⁇ 1 and an integer)
  • the number of subbands to be reported N sb N sb ⁇ 1 and an integer
  • the R transmission layers may include the 0th transmission layer to the R-1th transmission layer
  • the P polarization directions may include the 0th polarization direction to the P-1th polarization direction.
  • consecutive numbers may be started from 1. It should be understood that the foregoing descriptions are all settings that are convenient for describing the technical solutions provided by the embodiments of the present application, and are not intended to limit the scope of the present application.
  • the frequency domain unit may also be a subcarrier, a resource block (RB), etc., which is not limited in this application.
  • the precoding matrix corresponding to the subband involved in the embodiments of the present application may be understood as the precoding matrix determined based on the channel matrix of the subband. In the embodiments shown below, the meanings expressed by "precoding matrix corresponding to subbands" and “precoding matrix of subbands" may be the same unless otherwise specified.
  • Hadamard product operation can be represented by ⁇ .
  • Hadamard product matrix W a and W p can be expressed as
  • the Hadamard product of two matrices is obtained by multiplying the corresponding elements in two matrices of the same dimension. For example, a matrix with dimensions L ⁇ N sb And a matrix with dimension L ⁇ N sb Find the Hadamard product to get a matrix of dimension L ⁇ N sb Among them, l traverses the value from 0 to L-1, and n sb traverses the value from 0 to N sb -1.
  • the embodiments of the present application involve projection between vectors.
  • projecting vector A onto vector B can be understood as finding the inner product of vector A and vector B.
  • “for indicating” may include both for direct indication and for indirect indication.
  • the indication information may directly indicate A or indirectly indicate A, but does not mean that the indication information must carry A.
  • the information indicated by the indication information is called information to be indicated.
  • the information to be indicated can be directly indicated, such as the information to be indicated itself or the Indication index etc.
  • the information to be indicated may also be indirectly indicated by indicating other information, where there is an association relationship between the other information and the information to be indicated. It is also possible to indicate only a part of the information to be indicated, while other parts of the information to be indicated are known or agreed in advance. For example, it is also possible to realize the indication of specific information by means of the arrangement order of various information pre-agreed (such as stipulated in a protocol), thereby reducing the indication overhead to a certain extent.
  • the precoding matrix is composed of precoding vectors, and each precoding vector in the precoding matrix may have the same part in terms of composition or other attributes.
  • the specific indication method may also be various existing indication methods, such as, but not limited to, the above indication methods and various combinations thereof.
  • the specific details of the various indication methods can refer to the prior art, and will not be repeated here. It can be seen from the foregoing that, for example, when multiple information of the same type needs to be indicated, there may be cases where different information is indicated in different ways.
  • the required indication method can be selected according to specific needs. The embodiments of the present application do not limit the selected indication method. In this way, the indication methods involved in the embodiments of the present application should be understood as covering Fang learns various methods of the information to be indicated.
  • row vectors can be expressed as column vectors
  • a matrix can be represented by the transposed matrix of the matrix
  • a matrix can also be expressed in the form of a vector or an array, which is a vector or an array It can be formed by connecting the row vectors or column vectors of the matrix to each other, etc.
  • the information to be indicated may be sent together as a whole, or may be divided into multiple sub-information and sent separately, and the sending period and / or sending timing of these sub-information may be the same or different.
  • the specific sending method is not limited in this application.
  • the sending period and / or sending timing of these sub-information may be pre-defined, for example, pre-defined according to the protocol, or may be configured by the transmitting end device by sending configuration information to the receiving end device.
  • the configuration information may include, for example but not limited to, radio resource control signaling, such as RRC signaling, MAC layer signaling, such as MAC-CE signaling, and physical layer signaling, such as downlink control information (DCI).
  • RRC signaling such as RRC signaling
  • MAC layer signaling such as MAC-CE signaling
  • DCI downlink control information
  • pre-acquisition may include signaling indication or pre-defined by the network device, for example, protocol definition.
  • pre-defined can be achieved by pre-storing corresponding codes, tables or other methods that can be used to indicate relevant information in the device (for example, including terminal devices and network devices), and this application does not do for its specific implementation limited.
  • Tenth, "save” involved in the embodiments of the present application may refer to being saved in one or more memories.
  • the one or more memories may be set separately, or may be integrated in an encoder or decoder, a processor, or a communication device.
  • the one or more memories may also be partly set separately and partly integrated in a decoder, processor, or communication device.
  • the type of memory may be any form of storage medium, which is not limited in this application.
  • the "protocol” involved in the embodiments of the present application may refer to a standard protocol in the communication field, for example, it may include the LTE protocol, the NR protocol, and related protocols applied in future communication systems, which are not limited in this application .
  • At least one (a) of a, b, and c may represent: a, or, b, or, c, or, a and b, or, a and c, or, b and c, or, a , B and c, where a, b, c can be a single or multiple.
  • the method provided by the embodiments of the present application may be applied to a system that communicates through multi-antenna technology, for example, the communication system 100 shown in FIG. 1.
  • the communication system may include at least one network device and at least one terminal device.
  • Multi-antenna technology can communicate between network equipment and terminal equipment.
  • the embodiments shown below do not specifically limit the specific structure of the execution body of the method provided by the embodiments of the present application, as long as the program that records the code of the method provided by the embodiments of the present application can be executed to
  • the method provided in the embodiment of the application may be used for communication.
  • the execution body of the method provided in the embodiment of the present application may be a terminal device or a network device, or a functional module in the terminal device or network device that can call a program and execute the program.
  • FIG. 2 is a schematic flowchart of a method 200 for indicating and determining a precoding vector provided by an embodiment of the present application from the perspective of device interaction. As shown, the method 200 may include steps 210 to 240. The steps of the method 200 are described in detail below.
  • the specific process of the terminal device instructing the precoding vector and the network device to determine the precoding vector when the number of transmission layers is 1 and the number of polarization directions of the transmitting antenna is 1 is first described in detail.
  • the terminal device In step 210, the terminal device generates first indication information, which is used to indicate L beam vectors and one or more amplitude component vectors corresponding to each beam vector, weighting coefficients of each amplitude component vector, and one Or multiple phase component vectors and weighting coefficients of each phase component vector.
  • the L beam vectors and the weighting coefficients of the L beam vectors on each subband can be used to construct a precoding vector corresponding to each subband.
  • the set of weighting coefficients of each beam vector on N sb subbands may be referred to as the weighting coefficient vector of this beam vector.
  • the set of weighting coefficients on each subband of each beam vector may include a set of amplitude coefficients and a set of phase coefficients.
  • the set of amplitude coefficients on N sb subbands of each beam vector may be called an amplitude vector.
  • the set of phase coefficients of each beam vector on N sb subbands may be called a phase vector. Therefore, the weighting coefficient vector of each beam vector can be decomposed into an amplitude vector and a phase vector.
  • the amplitude component vector corresponding to the lth beam vector and the weighting coefficients of each amplitude component vector can be used to construct the lth
  • the phase component vector corresponding to the lth beam vector and the weighting coefficient of each phase component vector can be used to construct the phase vector of the weighting coefficient of the lth beam vector on each subband.
  • the amplitude vector of its weighting coefficient on each subband can be approximately expressed as a weighted sum of one or more amplitude component vectors
  • the phase vector on each subband can be approximately expressed as one or Weighted sum of multiple phase component vectors.
  • the amplitude vector and the amplitude component vector can satisfy among them, Represents the amplitude vector of the weighting coefficient of the l-th beam vector on each subband, Represents the number of amplitude component vectors corresponding to the lth beam vector, Represents the k a magnitude component vector, Represents the weighting coefficient of the k a magnitude component vector, k a , All are integers.
  • the phase vector and the phase component vector can satisfy: among them, Represents the phase vector of the weighting coefficient of the l-th beam vector in each subband, Represents the number of phase component vectors corresponding to the l-th beam vector, K p represents the phase component of the vector therein, Represents the weighting coefficient of the k pth phase component vector, k p , All are integers.
  • the terminal device may pass the L beam vectors and one or more amplitude component vectors with each beam vector, the weighting coefficients of the amplitude component vectors, the one or more phase component vectors and the weighting coefficients of the phase component vectors through the first An indication information is fed back to the network device, so that the network device determines the precoding vector of each subband.
  • the terminal device determines the L beam vectors, the amplitude component vector of each beam vector, the weighting coefficient of each amplitude component vector, the phase component vector of each beam vector, and the weighting coefficient of each phase component vector to generate first indication information Specific process.
  • the terminal device may determine the ideal precoding vector for each subband based on the channel matrix of each subband.
  • the terminal device may determine the channel matrix of each subband based on the reference signal sent by the network device, such as CSI-RS, and perform SVD on the channel matrix of each subband to obtain the ideal precoding vector for each subband To further determine the ideal precoding vector for each subband.
  • the method 200 further includes step 220, the network device sends a reference signal. Accordingly, the terminal device receives the reference signal.
  • the transmitting antenna of the network device may be a single polarized directional antenna. That is, the number of polarization directions may be 1, or the polarization directions are not distinguished; it may also be a multi-polarization antenna, that is, the number of polarization directions is greater than 1, such as the number of polarization directions is 2. This is for ease of understanding only. First, taking the number of polarization directions equal to 1 as an example, the specific process of generating the first indication information by the terminal device will be described in detail. The specific process of generating the first indication information by the terminal device when the number of polarization directions is greater than 1 will be described in detail later.
  • FIG. 3 is a schematic flowchart of a method for indicating a precoding vector provided by an embodiment of the present application. As shown in the figure, step 210 may specifically include step 2101 to step 2105.
  • step 2101 the terminal device determines L beam vectors and the weighting coefficient of each beam vector.
  • the terminal device may determine the beam vector based on each subband, or may determine the beam vector based on the broadband.
  • the beam vectors of any two subbands may be the same, or the beam vectors of at least two subbands may also be different.
  • the terminal device determines the beam vector based on the broadband the beam vectors of any two subbands may be the same. This application does not limit the specific method by which the terminal device determines L beam vectors.
  • the beam vectors of any two subbands may be the same.
  • the terminal device may determine ideal precoding vectors for each subband according to the channel matrix of each subband, and determine L beam vectors according to the ideal precoding vectors for each subband and a predefined set of beam vectors.
  • the terminal device may separately project the ideal precoding vectors of each subband onto each vector in the beam vector set to obtain multiple projection values.
  • the terminal device may select strong L beam vectors from the beam vector set according to multiple projection values.
  • the stronger L beam vectors can be understood as the L beam vectors with larger weighting coefficients. This is because the beam vectors with larger weighting coefficients occupy a larger weight in the linear combination, and have a greater influence on the approximate accuracy of the precoding vectors.
  • the beam vector set may include N tx column vectors.
  • the dimension of each column vector is N tx , and each vector can be taken from a two-dimensional (2dimension, 2D) -DFT matrix.
  • 2D can represent two different directions, such as a horizontal direction and a vertical direction.
  • N tx column vectors are orthogonal to each other.
  • the N tx column vectors in the beam vector set can be respectively written as Then, based on the N tx column vectors, a matrix B s can be constructed,
  • the ideal precoding vector corresponding to the n sb (0 ⁇ n sb ⁇ N sb -1 and n sb is an integer) subbands can be written as Based on the ideal precoding vectors of N sb subbands, a space-frequency matrix H can be constructed,
  • the terminal device may separately project the ideal precoding vectors of each subband to each column vector in the beam vector set, to obtain N tx ⁇ N sb projection values.
  • the N tx ⁇ N sb projection values may be each element in a matrix of dimension N tx ⁇ N sb calculated by B s H H. May each terminal device modulo each row, to give modulo N tx with N tx corresponding rows.
  • the terminal device may select L rows with a larger modulus from N tx rows according to the size of the modulus.
  • the modulus length of any one of the L rows is greater than or equal to the modulus length of any one of the remaining N tx -L rows.
  • the selected projection values in the L rows can be used as the weighting coefficients of the L beam vectors.
  • the weighting coefficient matrix G can be constructed as follows:
  • Each row in the weighting coefficient matrix G may correspond to a beam vector.
  • L rows correspond to L beam vectors one-to-one.
  • Each row vector in the weighting coefficient matrix G may be referred to as the weighting coefficient vector of the corresponding beam vector.
  • the N sb elements included in each row vector may correspond to the N sb subbands one-to-one.
  • the L column vectors used to generate the L rows with the larger modulus can be used as the L beam vectors selected in the spatial domain. That is, the column where the L beam vectors in the beam vector set are located corresponds to the row where the weighting coefficients of the L beam vectors in B s H H are located.
  • the number of the column where the L beam vectors in the beam vector set are located may be the number of the row where the elements in the weighting coefficient matrix G in B s H H are located.
  • the L beam vectors may correspond to L rows in the weighting coefficient matrix G one-to-one.
  • the set of beam vectors can be expanded to O s ⁇ N tx column vectors by an oversampling factor O s .
  • the dimension of each column vector in the beam vector set is N tx , and each vector can be taken from an oversampled 2D-DFT matrix.
  • the beam vector set comprises O s subsets, each subset including N tx column vectors, and any two column vectors within each subset may be mutually orthogonal.
  • the terminal device can select a subset from the subsets O s, selected subset comprises vectors selected L beams. For the convenience of distinction and description, the selected subset is recorded as the first subset.
  • the terminal device may determine L beam vectors based on the similar manner as described above. Specifically, the N tx column vectors in the o s (0 ⁇ o s ⁇ O s -1 and o s are integers) subsets of the set of beam vectors can be respectively written as Then based on the N tx column vectors, a matrix can be constructed
  • Over terminal device may be a precoding vector for each subband are projected to respective column vectors of the sub-beam vector set O s concentrated to give O s set of projection values, each set of projected values comprises N tx ⁇ N sb projection values.
  • O s set of projection values may be projected values of the terminal device obtained from the projection determines the weighting coefficient vectors beams L.
  • the N tx ⁇ N sb projection values in the projection values of the o s group can be determined by H calculates each element in the matrix of dimension N tx ⁇ N sb .
  • the H calculated dimension N tx ⁇ N sb matrix is called the projection matrix of subsets o s.
  • the terminal device may determine the L weighting coefficient vectors from the beam subsets corresponding to O s O s projections matrix.
  • each group of projection values may include N tx rows
  • the terminal device may select L rows with a larger modulus from the N tx rows of each group of projection values, and the modulus length of any one of the L rows is greater than or It is equal to the modulus length of any one of the remaining N tx -L rows in the same set of projection values.
  • the modulus lengths of the L rows are denoted as L larger values
  • the O s group larger values can be obtained from the above O s subsets.
  • the terminal device may further set the larger value is determined as a set of weighting coefficients vectors beams L from the O s. For example, O s larger set of values is selected as a set value of the L weighting coefficient vectors beams and modular length may be greater than or equal to the sum of the remaining die length group O s -1 to any one of the groups and.
  • the weighting coefficient matrix G constructed by the weighting coefficients of the L beam vectors may be the same as shown above.
  • the L column vectors used to generate the weighting coefficients of the L beam vectors in the beam vector set may belong to the same subset, that is, the above-mentioned first subset.
  • the L column vectors used to generate the weighting coefficients of the L beam vectors in the first subset may be selected as the L beam vectors in the spatial domain.
  • the above-mentioned space-frequency vector H can be approximately expressed as a weighted sum of the L beam vectors determined in step 2101. If the above L beam vectors are recorded as From the L beam vectors, a matrix U s can be constructed, Then the space-frequency matrix H can be expressed as H ⁇ U s G by the weighted sum of L beam vectors. It should be understood that the application does not limit the order of the L beam vectors.
  • the weighting coefficient matrix G may be a matrix composed of coefficients of each beam vector on each subband.
  • the weighting coefficient matrix G can be obtained by arranging the weighting coefficients of L beam vectors on each subband.
  • the weighting coefficient matrix G is shown for ease of understanding only, and does not mean that the terminal device generated the weighting coefficient matrix G during the process of determining the L beam vectors and the weighting coefficients of each beam vector.
  • the terminal device may determine the weighting coefficient vector in each subband for each beam vector.
  • the terminal device may only determine the set of weighting coefficients for each beam vector, and may not necessarily generate the weighting coefficient matrix G or the weighting coefficient vector.
  • step 2102 the terminal device determines an amplitude matrix and a phase matrix of weighting coefficients of L beam vectors.
  • the terminal device can decompose G into an amplitude matrix and a phase matrix as follows:
  • the weighting coefficient matrix may be determined by the Hadamard product of the amplitude matrix and the phase matrix. among them, Is the amplitude matrix G a , Is the phase matrix G p . which is,
  • Each row vector in the amplitude matrix may correspond to a beam vector.
  • the L row vectors correspond to the L beam vectors one-to-one, and each row vector may be referred to as the amplitude vector of the corresponding beam vector.
  • the amplitude matrix includes amplitude vectors of L beam vectors.
  • the N sb elements in each row vector can correspond to the N sb subbands one-to-one. Therefore, the elements in the magnitude matrix It can represent the amplitude coefficient of the weighting coefficient of the lth (0 ⁇ l ⁇ L-1, and l is an integer) in the n sb subband.
  • Each row vector in the phase matrix may also correspond to a beam vector.
  • the L row vectors correspond to the L beam vectors one-to-one, and each row vector may be called a phase vector of the corresponding beam vector.
  • the phase matrix includes phase vectors of L beam vectors.
  • the N sb elements in each row vector can correspond to the N sb subbands one-to-one. Therefore, the elements in the phase matrix It can represent the phase coefficient of the weighting coefficient of the lth beam vector in the n sb subband.
  • the terminal device may compress the above-mentioned amplitude matrix and phase matrix.
  • the terminal device may use a weighted sum of one or more amplitude component vectors to indicate each amplitude vector in the amplitude matrix, and use a weighted sum of one or more phase component vectors to indicate each phase vector in the phase matrix.
  • the terminal device can separately determine one or more amplitude component vectors corresponding to each beam vector and weighting coefficients of each amplitude component vector, and one or more phase component vectors corresponding to each beam vector and The weighting coefficient of each phase component vector.
  • the number of amplitude component vectors corresponding to any two beam vectors may be the same, or at least the number of amplitude vectors corresponding to at least two beam vectors The number can be different.
  • the number of phase component vectors corresponding to any two beam vectors may be the same, or the number of phase component vectors corresponding to at least two beam vectors may be different. This application does not limit this.
  • the number of amplitude component vectors corresponding to any two beam vectors is the same, and the number of phase component vectors corresponding to any two beam vectors is the same.
  • the number of corresponding amplitude component vectors and the number of phase component vectors may be the same or different, which is not limited in this application.
  • the number of corresponding amplitude component vectors may be ( Is a positive integer)
  • the number of corresponding phase component vectors can be ( Is a positive integer).
  • the value of can be the same or different. This application does not limit this.
  • Case 2 The amplitude components corresponding to at least two beam vectors are the same and the phase component vectors corresponding to at least two beam vectors are different;
  • step 2104 determines the correspondence with each beam vector.
  • the amplitude component vector corresponding to any two beam vectors is the same, and the phase component vector corresponding to any two beam vectors is the same.
  • an arbitrary number of beam vectors corresponding to the amplitude of the two components of the vector are the same, for example, referred to as K a, K a positive integer.
  • the number of phase component vectors corresponding to any two beam vectors is also the same, for example, denoted as K P , where K P is a positive integer.
  • K a and K p may be the same or different, which is not limited in this application.
  • K a and K p may be indicated by the network device, or may be reported by the terminal device, or may be defined in advance, such as protocol definition. This application does not limit this.
  • the method further comprising: a second network device indicating the number of transmission information, the second indication information indicating the amplitude component of the vector.
  • the terminal device receives the second indication information.
  • the second indication information may be carried in higher layer signaling, such as a radio resource control (radio resource control, RRC) message.
  • RRC radio resource control
  • the method further comprising: transmitting terminal equipment a second number indication information, second indication information indicates that the amplitude component of the vector.
  • the network device receives the second indication information.
  • the second indication information may be carried in uplink control information (uplink control information, UCI), such as CSI.
  • the method further includes: the network device sends third indication information, where the third indication information is used to indicate the number of phase component vectors. Accordingly, the terminal device receives the third indication information.
  • the third indication information may be carried in higher layer signaling, such as an RRC message.
  • the method further includes: the terminal device receives third indication information, where the third indication information is used to indicate the number of phase component vectors.
  • the network device receives the third indication information.
  • the third indication information may be carried in UCI, such as CSI.
  • the second indication information used to indicate the number of amplitude component vectors and the third indication information used to indicate the phase component vectors may be the same information or different information, which is not limited in this application.
  • the terminal device determines one or more amplitude component vectors corresponding to each beam vector and weighting coefficients of the amplitude component vectors.
  • the weighting coefficients are determined and each terminal component of the vector magnitude of the amplitude of a component of the vector K a.
  • each beam corresponding to a K a vector magnitude of the amplitude component of the vector components of the vector from a set of pre-defined.
  • the terminal device may project each vector in the amplitude matrix onto each vector in the set of amplitude component vectors to obtain multiple projection values.
  • the terminal device can select a K a strong component of the vector magnitude of the amplitude component from the vector set based on the plurality of projection values.
  • the number K a strong amplitude components of the vector may be understood as a weighting coefficient K a large amplitude component of the vector a.
  • the set of amplitude component vectors may include N sb column vectors.
  • the dimension of each column vector is N sb .
  • the N sb column vectors in the set of amplitude component vectors can be respectively written as Then, based on the N sb column vectors, a matrix B a can be constructed,
  • each element in the set of amplitude component vectors may be a sine function or a cosine function.
  • matrix B a e.g. or,
  • the terminal device may project each amplitude vector in the amplitude matrix to each column vector in the set of amplitude component vectors to obtain L ⁇ N sb projection values.
  • the dimension L ⁇ N sb projection values may be calculated by the obtained G a B a L ⁇ N sb of each element in a matrix. May each terminal modulo the each column of the matrix, to obtain the corresponding N sb columns modulo N sb, then according to the size of the mold length, from the N sb column select mode K a large number Column.
  • K a projection values of the column may be selected as the weighting coefficients K a component of the vector magnitude.
  • G a B a is extracted from the mold in the large columns K a, can be configured amplitude component of the vector weighting factor matrix Y a as follows:
  • N sb column vectors of the set of components of the vector magnitude, for generating K a column vector of the mold K a larger column may be used as an amplitude component of the vector. That is, a column weight coefficient a magnitude component of the vector where a number of K amplitude components of the vector with the columns where the G a B a vector of K amplitude components corresponds to a set.
  • the amplitude component of the set of vectors the number row K a where a component of the vector amplitude may be located to G a B a weighting factor matrix Y a number of elements in the column.
  • K a a component of the vector amplitude may correspond with the weighting factor matrix Y a K a in the columns.
  • G a magnitude above matrix can be approximated as weighted above a K a determined amplitude components, and vector. If the above K amplitude component vectors are respectively recorded as From the K a magnitude component vectors, a matrix U a can be constructed, The amplitude matrix G a can K a weighting vector and an amplitude component is expressed as G a ⁇ Y a U a H.
  • weighting factor matrix Y a is shown only for ease of understanding, and do not represent the terminal device generates the weighting factor matrix Y a weighting coefficient K a is determined in an amplitude component vector and each component of the vector magnitude of the process.
  • the terminal device may simply determine the set of weighting coefficients for each component of the vector magnitude, but does not necessarily generate the weighting factor matrix Y a.
  • the set of amplitude component vectors can be expanded to O a ⁇ N sb column vectors by an oversampling factor O a .
  • the oversampling factor O a is a positive integer.
  • the set of amplitude component vectors includes O a subsets, and each subset includes N sb column vectors, and any two column vectors in each subset can be orthogonal to each other.
  • the terminal device can select a subset from the subsets O a, the selected subset including a selected amplitude K a component of the vector.
  • the selected subset is recorded as the second subset.
  • K a terminal device may determine a vector based on the amplitude component described above in a similar manner. Specifically, the N sb column vectors in the o a (0 ⁇ o a ⁇ O a -1 and o a is an integer) subset of the set of amplitude component vectors can be written as Then based on the N sb column vectors, a matrix can be constructed
  • the terminal device may project each amplitude vector in the amplitude matrix to each column vector in the O a subset of the amplitude component vector set to obtain O a group of projection values, and each group of projection values includes L ⁇ N sb projection values.
  • the terminal device can be obtained from the projection O K a weighting coefficient determining the amplitude of a component of the vector in a set of projection values.
  • the L ⁇ N sb projection values in the o a group of projection values can be determined by Each element in the matrix with dimension L ⁇ N sb is calculated.
  • the The calculated matrix with dimension L ⁇ N sb is called the projection matrix of the o a subset.
  • the terminal device may determine a weighting coefficient K a and the amplitude component of the vector from O a O a subset corresponding to a projection matrix.
  • the value of each projection may include N sb columns
  • the terminal device may select a larger modulus K a column from columns N sb projection values in each group, the K a mold of any one column of column length Greater than or equal to the modulus length of any one of the remaining N sb -K a columns in the same set of projection values. If the modulus K of a long column, referred to as K a larger value in the above-described O a O a subset can be set larger value.
  • the terminal device may further determine a magnitude component K a weighting factor based on the vector and O a larger set of values.
  • determining a set of values from a larger set of values O may be greater than or equal to a set value of O remaining in any group a -1 And.
  • K a projection value of a column and die length may be greater than or equal to a set value of O remaining in any group a -1 And.
  • the weighting coefficients K a component of the vector magnitude of the weighting factor matrix constructed Y a may be the same as indicated above, for brevity, not repeated here.
  • Vector set used to generate the amplitude component K a K a weighting coefficient of an amplitude of a component of the vector column vectors can belong to the same subset, i.e., the second subset.
  • K a second subset of the amplitude of a component of the vector with the columns where Corresponding to the column where the weighting coefficients of the K a magnitude component vectors are located. among them, Represents a matrix of dimensions N sb ⁇ N sb constructed from column vectors in the second subset, 0 ⁇ x 2 ⁇ O a -1 and x 2 is an integer.
  • G a magnitude above matrix can be approximated as weighted above a K a determined amplitude components, and vector. If the above K amplitude component vectors are respectively recorded as From the K a magnitude component vectors, a matrix U a can be constructed, The amplitude matrix G a can K a weighting vector and an amplitude component is expressed as G a ⁇ Y a U a H.
  • each component of the vector magnitude of the amplitude of a component of the vector K a merely exemplary, should not constitute any limitation on the present application described above.
  • the present application specific implementation is determined and each of the weighting coefficient K a magnitude of a component of the vector components of the vector for the amplitude of the terminal device is not limited.
  • step 2104 the terminal device determines one or more phase component vectors corresponding to each beam vector and weighting coefficients of the phase component vectors.
  • the terminal device determines K p phase component vectors and the weighting coefficients of each phase component vector.
  • K p phase component vectors corresponding to each beam vector may be taken from a set of pre-defined phase component vectors.
  • the set of phase component vectors may include N sb column vectors, and each column vector may be a phase component vector.
  • the dimension of each column vector is N sb .
  • the N sb column vectors in the set of phase component vectors can be respectively written as Then, based on the N sb column vectors, a matrix B p can be constructed,
  • each column vector in the set of phase component vectors is taken from a DFT matrix.
  • Any two of the N sb column vectors are orthogonal to each other. For example, for any column vector (0 ⁇ n sb ⁇ N sb -1, and n sb is an integer), From this, the matrix B p can be obtained, for example
  • the terminal device may project each phase vector in the phase matrix to each column vector in the set of phase component vectors to obtain L ⁇ N sb projection values.
  • the L ⁇ N sb projection values may be each element in the matrix of dimension L ⁇ N sb calculated by G p B p . May each terminal device modulus for each column, to give the corresponding N sb columns modulo N sb.
  • the terminal device may select K p columns with a larger modulus from the N sb columns according to the size of the module length. The modulus length of any one of the K p columns is greater than or equal to the modulus length of any one of the remaining N sb -K p columns.
  • the projection values of the selected K p columns can be used as the weighting coefficients of the K p phase component vectors.
  • the vector may be an amplitude component of the weighting factor matrix Y p is configured as follows:
  • N sb column vectors of the set of vector phase component, for generating the column vectors K p of the mold a large number of columns K p can be used as a phase component of the vector. That is, the column of the J phase component vectors in the set of phase component vectors corresponds to the column of the weighting coefficients of the K p phase component vectors in G p B p .
  • the sequence number of the column in which the K p phase component vectors in the set of phase component vectors may be the sequence number of the column in which the elements in the weighting coefficient matrix Y p in G p B p are located.
  • P B p K p th component of the vector G may correspond to the weighting factor matrix Y p of K p rows.
  • phase matrix G p can be approximately expressed as a weighted sum of the K p phase component vectors determined above. If the above K p phase component vectors are written as From the K p phase component vectors, a matrix U p can be constructed, Then the phase matrix G p can be expressed as G p ⁇ Y p U p H by the weighted sum of K p phase component vectors.
  • phase component by a set of vectors O p oversampling factor expanded O p ⁇ N sb column vectors.
  • the oversampling factor Op is a positive integer.
  • each column vector in the set of phase component vectors is taken from an oversampled DFT matrix.
  • the phase component comprises a set of vectors O p subsets, each subset including N sb column vectors, and any two column vectors within each subset may be mutually orthogonal.
  • the terminal device can select a subset from the subsets O p, the selected subset includes K p phase component of the vector is selected.
  • the selected subset is recorded as the third subset.
  • the terminal device may determine K p phase component vectors based on the similar manner as described above.
  • the phase component of the set of vector o p (0 ⁇ o p ⁇ O p -1 and o p is an integer) subsets of N sb column vectors were referred to as Examples Then based on the N sb column vectors, a matrix can be constructed
  • Each terminal device may be a phase in the matrix phase vectors are projected to O p subsets each column vector of the phase component vector set, obtained set of projection O p value, the value of each projection comprises a L ⁇ N sb projection values.
  • the terminal device may determine the weighting coefficients K p phase component of the vector from the set of projection O p values obtained in the projection.
  • the L ⁇ N sb projection values in the projection values of the group o p can be determined by Each element in the matrix with dimension L ⁇ N sb is calculated.
  • the Calculated dimension L ⁇ N sb is called the projection matrix of the matrix o p subsets.
  • the terminal device may determine the weighting coefficients K p from the phase component of the vector and O p O p subsets corresponding to a projection matrix.
  • each projection matrix may include N sb columns
  • the terminal device may select K p columns with a larger modulus from the N sb columns of each projection matrix, and the module length of any one of the K p columns Greater than or equal to the modulus length of any one of the remaining N sb -K p columns. If the K p columns of die length, referred to as a K p value greater, by the subsets O p O p you can obtain a large set of values.
  • the terminal device may further determine K p phase component vectors and their weighting coefficients according to the larger value of the Op group.
  • O p set of values determining a set of values
  • the set values i.e., die length of the column and projection values of K p
  • the column projection values corresponding to this set of values can be used as the weighting coefficients of the K p phase component vectors.
  • the weighting coefficient matrix Y p constructed by the weighting coefficients of the K p phase component vectors may be the same as shown above, and for the sake of brevity, no further description is provided here.
  • Column vectors K p vector set of weighting coefficients for generating a phase component phase component of the vector K p may belong to the same subset, i.e., the third subset.
  • the third subset K p for generating a column vector of the weighting coefficients K p phase component of the vector phase can be used as component vectors K p.
  • phase matrix G p can be approximately expressed as a weighted sum of the K p phase component vectors determined above. If the above K p phase component vectors are written as From the K p phase component vectors, a matrix U p can be constructed, Then the phase matrix G p can be expressed as G p ⁇ Y p U p H by the weighted sum of K p phase component vectors.
  • the set of phase component vectors may include N sb column vectors, and each column vector may be a phase component vector.
  • the length of each column vector can be N sb .
  • Each column vector may include N sb phase angles.
  • the N sb column vectors in the set of phase component vectors can be respectively written as Then, based on the N sb column vectors, a matrix B p can be constructed,
  • N sb phase angles in the same column vector may constitute an equidistance sequence, and the tolerance of the equidistance sequence constituted by N sb phase angles in any two column vectors is different.
  • N sb the tolerance of the equidistance sequence constituted by N sb phase angles in any two column vectors.
  • the phase matrix G p can be expressed by the angle matrix ⁇ : ie Each row in the angle matrix can be called an angle vector.
  • the terminal device may project each angle vector in the angle matrix to each column vector in the phase component vector set to obtain L ⁇ N sb projection values.
  • the L ⁇ N sb projection values may be elements in a matrix of dimension L ⁇ N sb calculated from ⁇ B p . May each terminal device modulo each column, to give the corresponding N sb columns modulo N sb.
  • the terminal device may select K p columns with a larger modulus from the N sb columns according to the size of the module length. The modulus length of any one of the K p columns is greater than or equal to the modulus length of any one of the remaining N sb -K p columns.
  • the projection values of the selected K p columns can be used as the weighting coefficients of the K p phase component vectors.
  • the phase component of the vector may be constructed weighting factor matrix Y p.
  • K p can be used as a phase component of the vector. That is, the set of K phase components of the vector components of the vector p phase ⁇ B p columns where the columns of the weighting coefficients K p where the phase component of the vector corresponds.
  • the sequence number of the column in which the K p phase component vectors in the set of phase component vectors may be the sequence number of the column in which the elements in the weighting coefficient matrix Y p in ⁇ B p are located.
  • the K p phase component vectors may correspond to the K p columns in the weighting coefficient matrix Y p described above.
  • the K p phase component vectors can construct the matrix U p .
  • the phase matrix G p can still be expressed as a weighted sum of K p phase component vectors
  • each element in the matrix G p in the above formula has a one-to-one correspondence with the element at the corresponding position in the matrix Y p U p H.
  • the element in the mth row and nth column in Y p U p H can be written as A [m, n]
  • the element in the mth row and nth column in G p can be e jA [m, n] .
  • the description of the same or similar cases is omitted below.
  • weighting coefficient matrix Y p is shown for ease of understanding only, and does not mean that the terminal device generated the weighting coefficient matrix Y p during the process of determining the weighting coefficients of the K p phase component vectors and each phase component vector.
  • the terminal device may only determine the set of weighting coefficients for each phase component vector, and must have generated the weighting coefficient matrix Y p .
  • the phase component vector set by oversampling factor O p O p extended subsets wherein the oversampling factor of O p is a positive integer, each subset including N sb column vectors, and each The tolerances corresponding to any two column vectors in this subset are different.
  • the terminal device can select a subset from the subsets O p, the selected subset includes K p phase component of the vector is selected. For the convenience of distinction and description, the selected subset is recorded as the third subset.
  • the terminal device may determine the K p phase component vectors and the weighting coefficients of the phase component vectors in a similar manner as described above. Since it has been determined in the above K a terminal device based on a magnitude of the amplitude component vector set of O a subset of the specific process of weighting coefficients and each component of the vector components of the vector magnitude of a detailed description, for brevity, the specific procedure thereof will be omitted here Detailed description.
  • the K p phase component vectors can construct the matrix U p .
  • the phase matrix G p can still be expressed as a weighted sum of K p phase component vectors
  • step 2105 the terminal device generates first indication information.
  • the terminal device may K p phase and each phase component of the vector determined in step 2101 vector beams L, K a weighting factor and each component of the vector magnitude of the amplitude component of the vector determined in step 2013, and determines in step 2104 of The weighting coefficient of the component vector generates first indication information.
  • the terminal device may determine information indicating the L beam vectors. Since the L beam vectors are taken from a predefined set of beam vectors, when the first indication information is used to indicate the L beam vectors, it can specifically be used to indicate the positions of the L beam vectors in the beam vector set.
  • the beam vector set includes a plurality of mutually orthogonal column vectors, and the L beam vectors may be taken from the beam vector set.
  • the first indication information is used to indicate the L beam vectors, it may specifically be used to indicate the index of the combination of the L beam vectors in the beam vector set.
  • the protocol may predefine multiple combinations of multiple beam vectors, each combination may correspond to an index, and the L beam vectors may be one of the multiple combinations, or, close to one of the multiple combinations
  • the terminal device may indicate the L beam vectors through the combined index.
  • indicating L beam vectors by an index indicating a combination of L beam vectors is only one possible implementation manner, and should not constitute any limitation to this application.
  • the first indication information indicates the L beam vectors
  • it may also be used to indicate the index of each beam vector in the L beam vectors in the beam vector set. This application does not limit the specific manner of indicating L beam vectors.
  • the L beam vector sets may include multiple subsets, and the beam vectors in each subset may be orthogonal to each other.
  • the L beam vectors may be taken from a subset of the beam vector set, such as the first subset.
  • the first indication information is used to indicate the L beam vectors, it may specifically be used to indicate the first subset and the index of the L beam vectors in the first subset.
  • the index of the L beam vectors in the first subset may be, for example, an index of a combination of the L beam vectors, or an index of the L beam vectors, which is not limited in this application.
  • An amplitude information of a component of the vector K is determined based on the above-described step 2103 in the L K beam vectors each beam in a magnitude of a vector component of the vector, the terminal device may determine the beam for indicating each corresponding vector. Since a case, any two of K a beam vector corresponding to the amplitude of a vector component of the same, at the first indication information for indicating the magnitude of a K a beam vectors corresponding to each component of the vector, may be indicated only once K a amplitude component vectors, without separately indicating each beam vector, so that unnecessary overhead caused by repeated indications can be avoided.
  • the first indication information for indicating that the component of the vector in a K a magnitude, particularly K a may be used to indicate that a magnitude of the amplitude component of the vector The position in the set of component vectors.
  • the vector set comprises a plurality of amplitude components twenty-two mutually orthogonal vectors
  • the magnitude of a component of the vector K a may be taken from the amplitude component vector set.
  • the first indication information for indicating a magnitude of K a component of the vector may be used to indicate that the particular combinations of amplitude K a component of the vector index in the set of vectors of the amplitude component.
  • various combinations of protocol may be predefined plurality of amplitude component of the vector, each combination may correspond to an index
  • the K a for a magnitude component of the vector can be of a variety of combinations, or various combinations of the close of one
  • the terminal device may indicate that the amplitude of a K a component of the vector through the index of the combination.
  • the first indication information indicates that the number K a component of the vector when the magnitude, but also the magnitude of each component of the vector of the amplitude components of the vector a K a in the set of indices in the vector amplitude may be used to indicate components.
  • the present application is not limited to the particular embodiment indicated a K a component of the vector magnitude.
  • the amplitude of a component of the vector K a set may comprise a plurality of subsets, each subset may twenty-two beam vectors are mutually orthogonal.
  • the amplitude of a component of the vector K a may be taken from a subset of the set of vectors the amplitude component, such as a second subset.
  • the first indication information for indicating the magnitude of a component of the vector K a can be used particularly in the index indicating the second subset and a second subset of the amplitude of a component of the vector K a.
  • the amplitude of a component of the vector K a in the second subset for example, an index may be an index of the number K a combination of the amplitude component of the vector, or the magnitude of a K a component of the vector index, which is not defined in the present application.
  • the terminal device may determine the weighting coefficient information for indicating the magnitude of each component of the vector.
  • the terminal apparatus according to the weighting factor matrix Y a, manner by normalizing the weighting factor matrix indicate the various elements of Y a.
  • the weighting coefficient matrix may include L ⁇ K a elements.
  • the terminal device may determine the weighting coefficient with the largest modulus from the L ⁇ K a elements (for example, denoted as the largest coefficient), and indicate the position of the largest coefficient in the weighting coefficient matrix Y (for example, the The row number and column number of the largest coefficient in the coefficient matrix).
  • the terminal device may further instruct the relative value of the maximum coefficient corresponding to the largest weighting coefficient of each row in the weighting coefficient matrix (for example, recorded as the largest coefficient in the row), and other weighting coefficients of each row relative to the largest coefficient in the same row The relative value of; or the terminal device may further indicate the relative value of the largest weighting coefficient (for example, the maximum coefficient in the column) of each column in the weighting coefficient matrix relative to the maximum coefficient, and the other weighting coefficients of each column relative to The relative value of the largest coefficient in the same column.
  • the terminal device may further indicate the relative value of the largest weighting coefficient (for example, the maximum coefficient in the column) of each column in the weighting coefficient matrix relative to the maximum coefficient, and the other weighting coefficients of each column relative to The relative value of the largest coefficient in the same column.
  • the terminal device may determine the maximum weighting coefficients mold (i.e. above the maximum coefficient) from the L ⁇ K a of the elements, and indicate the position of the largest coefficient in the weighting factor matrix Y a (e.g., The number of the row and column of the maximum coefficient in the coefficient matrix). Then, the terminal device may further indicate that the weighting factor matrix Y a weighting coefficient with respect to the other of the relative value of the largest coefficient.
  • the terminal device may classify the maximum coefficient as 1, and indicate the relative value of other weighting coefficients in the weighting coefficient matrix relative to the maximum coefficient.
  • the terminal device may indicate the maximum coefficient by 1, and indicate the relative values of other weighting coefficients.
  • the above multiple relative values may be indicated by the index of the quantized value of each relative value.
  • a one-to-one correspondence between multiple quantization values and multiple indexes may be pre-defined in the codebook, and the terminal device may, based on the one-to-one correspondence, index the relative values of the above coefficients or close to the weighting coefficients.
  • the relative value index is fed back to the network device. Therefore, each weighting coefficient indicated by the terminal device may be the same as or close to the weighting coefficient determined in step 2103, and thus is called a quantization value of the weighting coefficient.
  • the terminal device in determining the weighting coefficient of each component of the vector magnitude of the process does not necessarily generate the weighting factor matrix Y a.
  • the weighting coefficient of each component of the vector amplitude may be extracted from the obtained G a B a K a column.
  • the terminal device may, according to the position of each weighting coefficient in the K p columns extracted from G p B p , according to a pre-defined order, for example, first by row and then by column, or, first by column and then by
  • the line indication indicates the weighting coefficients of the amplitude component vectors in sequence based on the normalization method described above.
  • the network device may also restore the weighting coefficients of the amplitude component vectors based on the same sequence.
  • the terminal device may also feed back each column or each row in the weighting coefficient matrix Y through a predefined coefficient codebook.
  • the predefined coefficient codebook includes multiple column vectors (or row vectors), each column A vector (or row vector) can correspond to an index.
  • the terminal device may each column (or row) of the weighting factor matrix Y a search for the nearest column (or row) in the codebook vector-based, and is fed back through the index.
  • the terminal device may determine information indicating K p phase component vectors corresponding to each beam vector. Since in case 1, the K p phase component vectors corresponding to any two beam vectors are the same, the first indication information may be used to indicate K only once when used to indicate the K p phase component vectors corresponding to each beam vector. The p phase component vectors do not need to be indicated separately for each beam vector, thereby reducing unnecessary overhead caused by repeated indications.
  • the K p phase component vectors are taken from a set of pre-defined phase component vectors, when the first indication information is used to indicate K p phase component vectors, it can specifically be used to indicate that the K p phase component vectors are in the phase component Position in vector collection.
  • the set of phase component vectors includes a plurality of mutually orthogonal column vectors, and the K p phase component vectors may be taken from the set of phase component vectors.
  • the first indication information is used to indicate the K p phase component vectors, it can specifically be used to indicate the index of the combination of the K p phase component vectors in the phase component vector set.
  • the protocol may predefine multiple combinations of multiple phase component vectors, each combination may correspond to an index, and the K p phase component vectors may be one of the multiple combinations, or close to the multiple combinations In one of these, the terminal device may indicate the K p phase component vectors through the combined index.
  • indicating the K p phase component vectors by the index indicating the combination of the K p phase component vectors is only one possible implementation manner, and should not constitute any limitation to the present application.
  • the first indication information indicates the K p phase component vectors
  • it may also be used to indicate the index of each of the K p phase component vectors in the set of phase component vectors. This application does not limit the specific manner of indicating K p phase component vectors.
  • the set of K p phase component vectors may include multiple subsets, and the beam vectors in each subset may be orthogonal to each other in pairs.
  • the K p phase component vectors can be taken from a subset of the set of phase component vectors, such as the third subset.
  • the first indication information is used to indicate the K p phase component vectors, it can specifically be used to indicate the third subset and the indexes of the K p phase component vectors in the third subset.
  • the phase component of the vector K p in the third subset index may be an index, for example, a combination of the p-phase component of the vector of the K, or the index p of the phase component of the vector K, which is not defined in the present application.
  • the terminal device can determine information indicating the weighting coefficients of each phase component vector.
  • the terminal apparatus according to the weighting factor matrix Y p, normalized by way of the weighting factor matrix indicate the various elements of Y p.
  • the weighting coefficient matrix may include L ⁇ K p elements.
  • the terminal device may determine the weighting coefficient with the largest modulus from the L ⁇ K p elements (for example, denoted as the largest coefficient), and indicate the position of the largest coefficient in the weighting coefficient matrix Y p (for example, The number of the row and column of the maximum coefficient in the coefficient matrix).
  • the terminal device may further instruct the relative value of the maximum coefficient corresponding to the largest weighting coefficient of each row in the weighting coefficient matrix (for example, recorded as the largest coefficient in the row), and other weighting coefficients of each row relative to the largest coefficient in the same row The relative value of; or the terminal device may further indicate the relative value of the largest weighting coefficient (for example, the maximum coefficient in the column) of each column in the weighting coefficient matrix relative to the maximum coefficient, and the other weighting coefficients of each column relative to The relative value of the largest coefficient in the same column.
  • the terminal device may further indicate the relative value of the largest weighting coefficient (for example, the maximum coefficient in the column) of each column in the weighting coefficient matrix relative to the maximum coefficient, and the other weighting coefficients of each column relative to The relative value of the largest coefficient in the same column.
  • the terminal device may determine the weighting coefficient with the largest modulus (that is, the above-mentioned maximum coefficient) from the L ⁇ K p elements, and indicate the position of the maximum coefficient in the weighting coefficient matrix Y p (for example, The number of the row and column of the maximum coefficient in the coefficient matrix). Then, the terminal device may further indicate the relative value of other weighting coefficients in the weighting coefficient matrix Y p relative to the maximum coefficient.
  • the terminal device may determine the weighting coefficient with the largest modulus (that is, the above-mentioned maximum coefficient) from the L ⁇ K p elements, and indicate the position of the maximum coefficient in the weighting coefficient matrix Y p (for example, The number of the row and column of the maximum coefficient in the coefficient matrix). Then, the terminal device may further indicate the relative value of other weighting coefficients in the weighting coefficient matrix Y p relative to the maximum coefficient.
  • the above multiple relative values may be indicated by the index of the quantized value of each relative value.
  • a one-to-one correspondence between multiple quantization values and multiple indexes may be pre-defined in the codebook, and the terminal device may, based on the one-to-one correspondence, index the relative values of the above coefficients or close to the weighting coefficients.
  • the relative value index is fed back to the network device. Therefore, each weighting coefficient indicated by the terminal device may be the same as or close to the weighting coefficient determined in step 2104, and thus is called a quantization value of the weighting coefficient.
  • the weighting coefficient matrix Y p is shown only for ease of understanding.
  • the terminal device does not necessarily generate the weighting coefficient matrix Y p during the process of determining the weighting coefficients of each phase component vector.
  • the weighting coefficients of each phase component vector can be obtained by extracting K p columns from G p B p .
  • the terminal device may, according to the position of each weighting coefficient in the K p columns extracted from G p B p , according to a pre-defined order, for example, first by row and then by column, or, first by column and then by
  • the line indication indicates the weighting coefficients of each phase component vector in sequence based on the normalization method described above.
  • the network device can also restore the weighting coefficients of each phase component vector based on the same sequence.
  • the terminal device may also feed back each column (or each row) in the weighting coefficient matrix Y p through a predefined coefficient codebook.
  • the predefined coefficient codebook includes multiple column vectors (or row vectors) Each column vector (or row vector) can correspond to an index.
  • the terminal device may find each column (or each row) in the weighting coefficient matrix Y p in the coefficient codebook to find the closest column vector (or row vector), and feed back through the index.
  • the amplitude components corresponding to at least two beam vectors are the same and different, and the phase component vectors corresponding to at least two beam vectors are different.
  • the number of amplitude component vectors and the number of phase component vectors corresponding to each beam vector can be defined separately.
  • the number of amplitude component vectors corresponding to the l-th beam vector can be written as It is a positive integer.
  • the number of phase component vectors corresponding to the l-th beam vector can be written as It is a positive integer.
  • the number of amplitude component vectors and the number of phase component vectors may be the same or different, which is not limited in this application.
  • the number of amplitude component vectors and the number of phase component vectors corresponding to each beam vector may be indicated by the network device, or may be reported by the terminal device, or may be pre-defined, such as protocol definition.
  • the method further includes: the network device sending second indication information, the second indication information used Is used to indicate the number of amplitude component vectors of each beam vector. Accordingly, the terminal device receives the second indication information.
  • the second indication information may be carried in higher layer signaling, such as an RRC message.
  • the method further includes: the terminal device sends second indication information, which is used to Is used to indicate the number of amplitude component vectors of each beam vector.
  • the network device receives the second indication information.
  • the second indication information may be carried in UCI, such as CSI.
  • the method further includes: the network device sends third indication information, which is used to indicate that each beam vector corresponds to The number of phase component vectors. Accordingly, the terminal device receives the third indication information.
  • the third indication information may be carried in higher layer signaling, such as RRC message.
  • the method further includes: the terminal device sends third indication information, which is used to Is used to indicate the number of phase component vectors of each beam vector.
  • the network device receives the third indication information.
  • the third indication information may be carried in UCI, such as CSI.
  • the information used to indicate the number of amplitude component vectors for L beam vectors may be one or more
  • the information used to indicate the number of phase component vectors of the L beam vectors can be one or multiple.
  • Information on the number of amplitude component vectors and information on phase component vectors of the same beam vector may be indicated by the same information, or may be indicated by different information. This application does not limit this.
  • the terminal device determines one or more amplitude component vectors corresponding to each beam vector and weighting coefficients of the amplitude component vectors.
  • the terminal device may determine one or more amplitude component vectors corresponding to each beam vector and the weighting coefficient of each amplitude component vector according to a set of predefined amplitude component vectors. That is, optionally, one or more amplitude component vectors corresponding to each beam vector are taken from a predefined set of amplitude component vectors.
  • the terminal device may traverse the value of l within the range of 0 to L-1, and repeatedly perform the operations described below to determine the corresponding to the lth beam vector Amplitude component vectors and weighting coefficients of each amplitude component vector.
  • the terminal device may determine the amplitude vector corresponding to the l-th beam vector according to the amplitude matrix determined in step 2102 This amplitude vector can be written as g a, l , for example, The terminal device may project the amplitude vector g a, l corresponding to the l-th beam vector to each column vector in the amplitude component vector set to obtain multiple projection values. The terminal device may further determine the strongest from the set of amplitude component vectors according to the multiple projection values Amplitude component vectors. The stronger A magnitude component vector can be understood as a larger weighting coefficient Amplitude component vectors.
  • the set of amplitude component vectors includes N sb column vectors, and the dimension of each column vector is N sb . Any two column vectors in the set of amplitude component vectors can be orthogonal to each other.
  • the terminal device may project the amplitude vector g a, l to each column vector in the set of amplitude component vectors to obtain N sb projection values. According to the modulus length of the N sb projection values, choose the one with larger modulus Projection values. The larger The modulus of any one of the projected values is greater than or equal to the rest Modulus of any one of the projected values.
  • the selected module is larger Projection values can be used as Weighting coefficients of the amplitude component vectors.
  • the column vectors can be used as amplitude component vectors. That is, in the set of amplitude component vectors Amplitude component vectors in the column and the amplitude component vector set are used to generate the larger modulus Projected Each column vector corresponds to the column. For example, in the set of amplitude component vectors The sequence number of the column in which the amplitude component vectors are located can be Projected The sequence number of the column where the column vectors are located. A magnitude component vector can be compared with One weighting coefficient corresponds to each other.
  • the set of amplitude component vectors can be expanded to O a ⁇ N sb column vectors by an oversampling factor O a .
  • the oversampling factor O a is a positive integer. That is, the amplitude component vector may include O a subsets, each subset includes N sb column vectors, and any two column vectors in each subset may be orthogonal to each other.
  • the terminal device may project the amplitude vectors g a, l to each column vector of O a subset in the set of amplitude component vectors to obtain O a set of projection values, and each set of projection values may include N sb projection values.
  • the terminal device can determine from the O a set of projection values obtained by the projection Weighting coefficients of the amplitude component vectors. For example, the terminal device can determine the larger modulus from each group of projection values of the O a group of projection values. Projection values. In each set of projection values, the larger the modulus The projected values have a modulus greater than or equal to the rest of the same set of projected values The modulus length of any one of the projected values.
  • the terminal device may further determine a group from the larger group of O a as a Weighting coefficients of the amplitude component vectors. For example, the larger value in the O a group was selected as The sum of the modulus lengths of a group of values of the weighting coefficients of the amplitude component vectors may be greater than or equal to the sum of the modulus lengths of any one of the remaining O a -1 groups.
  • Amplitude component vector set is used to generate Weighted coefficients of amplitude component vectors
  • the column vectors may belong to the same subset, that is, the above second subset.
  • the second subset The columns of the amplitude component vectors and the second subset are used to generate Projected Each column vector corresponds to the column.
  • the second subset The sequence number of the column where the amplitude component vectors are located can be used to generate Projected The sequence number of the column where the column vectors are located.
  • a magnitude component vector can be compared with One weighting coefficient corresponds to each other.
  • the terminal device may separately determine one or more amplitude component vectors corresponding to each of the L beam vectors and the weighting coefficients of the amplitude component vectors.
  • the terminal device may directly indicate the amplitude vector of each beam vector. That is, the number of amplitude component vectors for each beam vector is 1, and the weighting coefficient is also 1.
  • the terminal device may indicate each element in each amplitude vector to the network device.
  • the terminal device and the network device can predefine a one-to-one correspondence between multiple quantization values and multiple indexes, and the terminal device can indicate the index of each element in each amplitude vector or the quantization value close to each element to the network device , So that the network device recovers each amplitude vector based on the index of each quantized value.
  • the terminal device may indicate each amplitude vector to the network device. This is equivalent to not compressing the amplitude matrix.
  • step 2104 the terminal device determines one or more phase component vectors corresponding to each beam vector and weighting coefficients of the phase component vectors.
  • the terminal device can determine the K p phase component vectors and the weighting coefficients of the phase component vectors through either of the following two implementation methods:
  • Implementation method 1 Determine K p phase component vectors and the weighting coefficients of each phase component vector according to the phase vector of each beam vector and the set of pre-defined phase component vectors;
  • Implementation method 2 A linear fitting method is used to determine the phase vector of each beam vector.
  • the terminal device may determine one or more phase component vectors corresponding to each beam vector and the weighting coefficient of each phase component vector according to a set of pre-defined phase component vectors. That is, optionally, one or more phase component vectors corresponding to each beam vector are taken from a predefined set of phase component vectors.
  • phase component vector set has been described in detail in case 1 above, and for the sake of brevity, it will not be repeated here.
  • the terminal device may traverse the value of l within the range of 0 to L-1, and repeatedly perform the operations described below to determine the corresponding to the lth beam vector Each phase component vector and the weighting coefficient of each phase component vector.
  • the terminal device may determine the phase vector corresponding to the l-th beam vector according to the phase matrix determined in step 2102 This phase vector can be written as g p, l , for example
  • the terminal device may project the phase vector g p, l corresponding to the l-th beam vector to each column vector in the phase component vector set to obtain multiple projection values.
  • the terminal device may further determine the strongest from the set of phase component vectors according to the multiple projection values Phase component vectors. The stronger The phase component vectors can be understood as those with larger weighting coefficients Phase component vectors.
  • each column vector in the set of phase component vectors may be taken from a DFT matrix or an oversampled DFT matrix.
  • the terminal device may determine the lth Beam vector Each phase component vector and the weighting coefficient of each phase component vector.
  • the terminal device has specified in detail that the terminal device determines the A specific process of each amplitude component vector and the weighting coefficient of each amplitude component vector.
  • the specific process in which the terminal device determines one or more phase component vectors corresponding to each beam vector and the weighting coefficient of each phase component vector in step 2104 is similar to the above process. For brevity, a detailed description of its specific process is omitted here.
  • each column vector in the set of phase component vectors includes N sb phase angles.
  • the terminal device may determine the angle vector of the l-th beam vector according to the phase vector of the l-th beam vector. Then, the terminal device may determine the projection value of each angle vector of the angle vector of the l-th beam vector in the phase component vector set with the Each phase component vector and the weighting coefficient of each phase component vector.
  • the terminal device may project the angle vector of the l-th beam vector to each column vector of the phase component vector set to obtain N sb projection values.
  • the modulus length of the N sb projection values choose the one with larger modulus Projection values.
  • the larger The modulus of any one of the projected values is greater than or equal to the rest Modulus of any one of the projected values.
  • the selected module is larger Projection values can be used as Weighting coefficients of the phase component vectors.
  • the phase may be considered components of a vector set comprises O p subsets, each subset including N sb column vectors.
  • the terminal device can be determined based on a similar method as described above Each phase component vector and the weighting coefficient of each phase component vector. Since it has been determined in the above K a terminal device based on a magnitude of the amplitude component vector set of O a subset of the specific process of weighting coefficients and each component of the vector components of the vector magnitude of a detailed description, for brevity, the specific procedure thereof will be omitted here Detailed description.
  • the K p phase component vectors corresponding to each beam vector can be determined by linear fitting respectively.
  • the phase vector corresponding to each beam vector can be indicated by a phase component vector. That is, K p corresponding to each beam vector is 1, and the weighting coefficient is also 1.
  • a phase component vector can be used as a phase vector.
  • the angle of each phase vector in the phase matrix G p may change linearly.
  • a vector of the phase matrix G p Medium, each angle value It is possible to construct an equal series with tolerance d 0 and a vector of phase matrix G p Medium, each angle value It is possible to construct an arithmetic sequence with tolerance d 1 , and so on, a vector of phase matrix G p Medium, each angle value Arithmetic series with tolerance d L-1 can be constructed.
  • the tolerance corresponding to each phase vector in the phase matrix G p may be positive or negative, or may be zero.
  • the tolerances corresponding to any two phase vectors may be different or the same. This application does not limit this.
  • the first indication information when used to indicate the phase matrix, it may specifically be used to indicate at least two of the first phase angle, the last phase angle, and the tolerance of each phase vector.
  • each angle value in a certain vector of the phase matrix G p may vary within the range of 0 to 2 ⁇ . But in fact, these angles may be approximately satisfied among them, Represents the angle of the nth sb element in the lth phase vector in the phase matrix G p ; ⁇ l, 0 represents the angle of the 0th element in the lth phase vector; 0 ⁇ n sb ⁇ N sb -1 , N sb is an integer; d l represents the tolerance of the lth phase vector, d l can be positive or negative, or it can be 0; the value of m can make the result The value of falls within the range of [0,2 ⁇ ], so m can be positive or negative, or it can be 0.
  • the first indication information when used to indicate the phase matrix, it can be specifically used to indicate: the first phase angle and tolerance of each phase vector, or the last phase angle and tolerance of each phase vector, Or, the first phase angle, the last phase angle of each phase vector, and the number of cycles between the last phase angle and the first phase angle.
  • the number of periods mentioned here can be understood as the number of 2 ⁇ between the last phase angle and the first phase angle, which is m as defined above.
  • the number of cycles can be determined by the number of breakpoints connecting the phase angles of the same phase vector. For example, if there are two breakpoints on the phase angle line of the same phase vector, it can be considered that the last phase angle is separated from the first phase angle by 2 2 ⁇ .
  • the above-mentioned multiple phase angles can be indicated by the index of each phase angle.
  • a one-to-one correspondence relationship between multiple phase angles and multiple indexes may be pre-defined in the codebook, and the terminal device may feedback the indexes corresponding to the above phase angles or the indexes close to each phase angle based on the one-to-one correspondence To network equipment. Therefore, each phase angle indicated by the terminal device may be the same as or close to the phase angle determined in step 2104.
  • the change trend of the angle of each phase vector in the above phase matrix is a linear change trend, and should not constitute any limitation to this application.
  • the change trend of the angle of the phase vector may be a polyline.
  • the broken line can be divided into multiple sections with different slopes, and each section can have a linear change trend, which can be called a section of linear section.
  • each piece of linear region may be separately indicated based on the manner described above. For brevity, I will not repeat them here.
  • the change trend of the angle of the phase vector is often a polyline.
  • the number of linear regions divided by the polyline can be defined in advance, such as the protocol definition, or can be indicated by the network device, or can be defined and reported by the terminal device itself. This application does not limit this.
  • the terminal device may separately determine one or more phase component vectors corresponding to each of the L beam vectors and the weighting coefficient of each phase component vector.
  • step 2105 the terminal device generates first indication information.
  • the terminal device may be based on the L beam vectors determined in step 2101, the one or more amplitude component vectors corresponding to each beam vector determined in step 2013, and the weighting coefficients of the amplitude component vectors, and the The one or more phase component vectors corresponding to each beam vector and the weighting coefficients of each phase component vector generate first indication information.
  • the terminal device may determine information indicating the L beam vectors.
  • the first indication information has been described in detail in the specific method for indicating the L beam vectors in case one, and for the sake of brevity, it will not be repeated here.
  • the terminal device may determine information indicating one or more amplitude component vectors for each beam vector.
  • the first indication information may respectively indicate one or more amplitude component vectors corresponding to each beam vector.
  • the first indication information may include information indicating one or more amplitude component vectors corresponding to each beam vector of the L beam vectors.
  • the first indication information may include an indication corresponding to the lth beam vector Information of a magnitude component vector. As if The index of the combination of the amplitude component vectors in the set of amplitude component vectors, or, the A subset of the magnitude component vectors and the The index of the combination of the amplitude component vectors in this subset.
  • the first indication information indicates that the lth beam vector corresponds to DETAILED an amplitude component of the vector in the above case a first indication information indicating a magnitude of the same K a component of the vector DETAILED sake of brevity not repeated here.
  • the terminal device may determine information indicating the weighting coefficients of the amplitude component vectors corresponding to each beam vector in the domain.
  • the first indication information may indicate the weighting coefficients of the amplitude component vectors corresponding to each beam vector, respectively.
  • the first indication information may include information indicating weighting coefficients of the amplitude component vectors corresponding to each beam vector of the L beam vectors. For example, for the lth beam vector out of the L beam vectors, the first indication information may include an indication corresponding to the lth beam vector Information about the weighting coefficients of the amplitude component vectors. For example, the terminal device can be indicated by a normalized way Weighting coefficients of the amplitude component vectors.
  • weighting coefficients K a magnitude of a component of the vector by normalizing mode.
  • the terminal device indicates through the normalized way
  • the specific process of the weighting coefficients of the amplitude component vectors is similar, and for the sake of brevity, they are not repeated here.
  • the terminal device may determine information indicating one or more phase component vectors for each beam vector.
  • the first indication information may respectively indicate one or more phase component vectors corresponding to each beam vector.
  • the terminal device can determine one or more phase component vectors corresponding to each beam vector through two different implementations.
  • a method for indicating one or more phase component vectors corresponding to each beam vector by using the first indication information is described in combination with the two implementation manners.
  • the first indication information may include information indicating one or more phase component vectors corresponding to each beam vector of the L beam vectors.
  • the first indication information may include an indication corresponding to the lth beam vector Information of a phase component vector. As if Index of the combination of phase component vectors in the set of phase component vectors, or, the A subset of phase component vectors and the The index of the combination of the phase component vectors in this subset.
  • the first indication information indicates that the lth beam vector corresponds to
  • the specific manner of the phase component vectors is the same as the specific manner in which the first indication information described in case 1 above indicates K p phase component vectors, and for the sake of brevity, details are not described here.
  • the terminal device can determine information indicating the weighting coefficients of the phase component vectors corresponding to each beam vector.
  • the first indication information may indicate the weighting coefficient of each phase component vector corresponding to each beam vector, respectively.
  • the first indication information may include information for indicating weighting coefficients of each phase component vector corresponding to each beam vector of the L beam vectors. For example, for the lth beam vector out of the L beam vectors, the first indication information may include an indication corresponding to the lth beam vector Information about the weighting coefficients of the phase component vectors. For example, the terminal device can be indicated by a normalized way Weighting coefficients of the phase component vectors.
  • the terminal device determines the phase component vector corresponding to each beam vector by linear fitting.
  • the first indication information is used to indicate the phase component vector corresponding to each beam vector, it can specifically be used to indicate the first phase angle, the last phase angle, and the last phase angle and the first phase angle of each phase component vector The number of periods apart; alternatively, it can also be used to indicate the first phase angle and tolerance of each phase component vector, or the last phase angle and tolerance of each phase component vector.
  • the phase component vector of each beam vector can be used as a phase vector, it can be considered that the weighting coefficient of each phase component vector is 1. Therefore, when the terminal device indicates the relevant information of the phase angle listed above through the first indication information, the weighting coefficient of the phase component vector may be defaulted to 1.
  • the first indication information is used to indicate the first phase angle, the last phase angle, and the number of cycles between the last phase angle and the first phase angle of each phase component vector, or When the first phase angle and tolerance of each phase component vector or the last phase angle and tolerance of each phase component vector are considered, the first indication information may implicitly indicate that the weighting coefficient of each phase component vector is 1 .
  • the terminal device can separately indicate the phase vector of each beam vector, which is equivalent to not compressing the phase matrix.
  • the amplitude component vectors corresponding to any two beam vectors are the same, but the phase component vectors corresponding to at least two beam vectors are different.
  • an arbitrary number of beam vectors corresponding to the two components of the vector amplitude may be the same, for example, referred to as K a.
  • the number of phase component vectors corresponding to each beam vector can be defined separately.
  • the number of phase component vectors corresponding to the l-th beam vector can be written as It is a positive integer.
  • the number of amplitude component vectors and the number of phase component vectors corresponding to each beam vector may be indicated by the network device, or may be reported by the terminal device, or may be pre-defined, such as protocol definition.
  • the method further comprising: a second network device indicating the number of transmission information, the second indication information indicating the amplitude component of the vector. Accordingly, the terminal device receives the second indication information.
  • the second indication information may be carried in higher layer signaling, such as an RRC message.
  • the method further comprising: transmitting terminal equipment a second number indication information, second indication information indicates that the amplitude component of the vector.
  • the network device receives the second indication information.
  • the second indication information may be carried in UCI, such as CSI.
  • the method further includes: the network device sends third indication information, which is used to indicate that each beam vector corresponds to The number of phase component vectors. Accordingly, the terminal device receives the third indication information.
  • the third indication information may be carried in higher layer signaling, such as an RRC message.
  • the method further includes: the terminal device sends third indication information, which is used to Is used to indicate the number of phase component vectors of each beam vector.
  • the network device receives the third indication information.
  • the third indication information may be carried in UCI, such as CSI.
  • the information for indicating the number of phase component vectors for L beam vectors may be one or multiple.
  • Information on the number of amplitude component vectors and information on phase component vectors of the same beam vector may be indicated by the same information, or may be indicated by different information. This application does not limit this.
  • the terminal device determines one or more amplitude component vectors corresponding to each beam vector and weighting coefficients of the amplitude component vectors.
  • step 2104 the terminal device determines one or more phase component vectors corresponding to each beam vector and weighting coefficients of the phase component vectors.
  • the specific process in which the terminal device determines one or more phase component vectors corresponding to each beam vector and the weighting coefficients of the phase component vectors is the same as the specific process of step 2104 in case two. Repeat.
  • step 2105 the terminal device generates first indication information.
  • the terminal device may be determined in step 2101 vector beams L, K a weighting factor and each component of the vector magnitude of the amplitude component of the vector determined in step 2103, and determines in step 2104 with each beam corresponding to a vector or
  • the plurality of phase component vectors and the weighting coefficients of each phase component vector generate first indication information.
  • the first indication information for indicating the L beam vectors, and each weighting coefficient when the amplitude of a component of the vector K a component of the vector amplitude may be used as the L beam vectors indicated in the case of a 2105 step, a K a
  • the amplitude component vector and the weighting coefficient of each amplitude component vector are indicated. For brevity, I will not repeat them here.
  • the indication and each beam vector as described in step 2105 of case two may be used.
  • the corresponding one or more phase component vectors and the weighting coefficient of each phase component vector are used to indicate. For brevity, I will not repeat them here.
  • the amplitude component vectors corresponding to at least two beam vectors are different, but the phase component vectors corresponding to any two beam vectors are the same.
  • the number of phase component vectors corresponding to any two beam vectors may be the same, for example, it may be recorded as K p .
  • the number of amplitude component vectors corresponding to each beam vector can be defined separately.
  • the number of amplitude component vectors corresponding to the l-th beam vector can be written as It is a positive integer.
  • the number of amplitude component vectors and the number of phase component vectors corresponding to each beam vector may be indicated by the network device, or may be reported by the terminal device, or may be pre-defined, such as protocol definition.
  • the method further includes: the network device sending second indication information, the second indication information used Is used to indicate the number of amplitude component vectors of each beam vector. Accordingly, the terminal device receives the second indication information.
  • the second indication information may be carried in higher layer signaling, such as an RRC message.
  • the method further includes: the terminal device sends second indication information, which is used to Is used to indicate the number of amplitude component vectors of each beam vector.
  • the network device receives the second indication information.
  • the second indication information may be carried in UCI, such as CSI.
  • the method further includes: the network device sends third indication information, where the third indication information is used to indicate the number of phase component vectors. Accordingly, the terminal device receives the third indication information.
  • the third indication information may be carried in higher layer signaling, such as an RRC message.
  • the method further includes: the terminal device receives third indication information, where the third indication information is used to indicate the number of phase component vectors.
  • the network device receives the third indication information.
  • the third indication information may be carried in UCI, such as CSI.
  • the information for indicating the number of amplitude component vectors of L beam vectors may be one or multiple.
  • Information on the number of amplitude component vectors and information on phase component vectors of the same beam vector may be indicated by the same information, or may be indicated by different information. This application does not limit this.
  • the terminal device determines one or more amplitude component vectors corresponding to each beam vector and weighting coefficients of the amplitude component vectors.
  • the specific process for the terminal device to determine one or more amplitude component vectors corresponding to each beam vector and the weighting coefficients of the amplitude component vectors is the same as the specific process of step 2103 in case two. Repeat.
  • step 2104 the terminal device determines one or more phase component vectors corresponding to each beam vector and the weighting coefficient of each phase component vector.
  • the terminal device determines K p phase component vectors and the weighting coefficients of each phase component vector.
  • the specific process for the terminal device to determine the K p phase component vectors and the weighting coefficients of each phase component vector is the same as the specific process of step 2104 in case 1, and is not repeated here for brevity.
  • step 2105 the terminal device generates first indication information.
  • the terminal device may be based on the L beam vectors determined in step 2101, the one or more amplitude component vectors corresponding to each beam vector determined in step 2103 and the weighting coefficients of the amplitude component vectors, and the K determined in step 2104
  • the p phase component vectors and the weighting coefficients of each phase component vector generate first indication information.
  • the indication L beam vectors, K p When the first indication information is used to indicate L beam vectors, K p phase component vectors, and the weighting coefficients of each phase component vector, the indication L beam vectors, K p The phase component vector and the weighting coefficient of each phase component vector are indicated. For brevity, I will not repeat them here.
  • the indication and each amplitude vector described in step 2105 of case two may be used.
  • the corresponding one or more amplitude component vectors and the weighting coefficients of the amplitude component vectors are used to indicate. For brevity, I will not repeat them here.
  • the terminal device determines L beam vectors, the amplitude component vector of each beam vector and the weighting coefficient of each amplitude component vector, the phase component vector of each beam vector and each phase component The weighting coefficient and the specific process of generating the first indication information.
  • the weighting coefficient of the amplitude component vector is 1, or the weighting coefficient of the phase component vector is 1. . That is, the amplitude component vector can be directly used as the amplitude vector, or the phase vector can be directly used as the phase vector.
  • this application does not limit the specific manner in which the terminal device determines L beam vectors, the amplitude component vector of each beam vector and the weighting coefficient of each amplitude component vector, the phase component vector of each beam vector and the weighting coefficient of each phase component vector.
  • this application also specifies a specific way for the terminal device to indicate L beam vectors, the amplitude component vector of each beam vector and the weighting coefficient of each amplitude component vector, the phase component vector of each beam vector and the weighting coefficient of each phase component vector Not limited.
  • step 230 the terminal device sends the first indication information.
  • the network device receives the first indication information.
  • the first indication information may be PMI, or some information elements in the PMI, or other information. This application does not limit this.
  • the first indication information may be carried in one or more messages in the prior art and sent by the terminal device to the network device, or may be carried in one or more messages newly designed in the present application and sent by the terminal device to the network device.
  • the terminal device may send the first indication information to the network device through physical uplink resources, such as a physical uplink shared channel (physical uplink shared channel (PUSCH) or physical uplink control channel (PUCCH), for example, to facilitate the network device
  • PUSCH physical uplink shared channel
  • PUCCH physical uplink control channel
  • the specific method for the terminal device to send the first indication information to the network device through the physical uplink resource may be the same as that in the prior art. For brevity, a detailed description of the specific process is omitted here.
  • step 240 the network device determines a precoding vector N sb subbands in the at least one subband according to the first indication information.
  • the network device may determine L beam vectors, one or more amplitude component vectors of each beam vector and the quantized value of the weighting coefficient of each amplitude component vector, and one or more phases of each beam vector based on the first indication information Quantized values of component vectors and weighting coefficients of each phase component vector. Thereafter, the network device may further determine the precoding vector of at least one subband of the N sb subbands. For example, N sb sub precoding vector n sb first subband band. Among them, 0 ⁇ n sb ⁇ N sb -1, and n sb is an integer.
  • the network device may determine the precoding vector of at least one subband of the N sb subbands based on the first indication information.
  • the network device may be based on L beam vectors, one or more amplitude component vectors of each beam vector and the quantized values of the weighting coefficients of each amplitude component vector, and one or more phase component vectors and each phase component of each beam vector
  • the quantized value of the weighting coefficient of the vector determines the precoding vector of each subband, but this does not mean that the network device determines the precoding vector of the N sb subbands.
  • the network device may determine the amplitude vector of each beam vector based on one or more amplitude component vectors of each beam vector and the quantized value of the weighting coefficient of each amplitude component vector.
  • the network device may determine the phase vector of each beam vector based on one or more phase component vectors of each beam vector and the quantized value of the weighting coefficient of each phase component vector.
  • the network device may further determine the weighting coefficient of each beam vector over N sb subbands. For example, the Hadamard product of the amplitude vector and phase vector of the l-th beam vector is used as the weighting coefficient of the l-th beam vector in N sb subbands.
  • the network device may determine the precoding vector n sb of subbands.
  • the network device may according to the L beam vectors indicated in the first indication information, one or more amplitude component vectors of each beam vector, and the quantized values of The quantized values of one or more phase component vectors of each beam vector and the weighting coefficients of each phase component vector are determined according to the following formulas, respectively corresponding to N sb subbands:
  • the matrix H in the formula may be similar to the space-frequency matrix described above, or is the space-frequency matrix recovered by the network device according to the first indication information. Since the space-frequency matrix may be constructed from the precoding vectors corresponding to the N sb subbands, the network device may determine the precoding vectors corresponding to the n sb subbands according to the n sb column vectors in the matrix H.
  • the network device may perform normalization processing on the n sb column vector to determine the precoding vector corresponding to the n sb subband.
  • the normalization process may be, for example, multiplying the n sbth column vector by a normalization coefficient, so that the sum of the powers of the elements in the column vector is equal to 1.
  • the normalization coefficient may be, for example, the reciprocal of the square root of the sum of the modulus lengths of the elements in this column. This application does not limit the specific value of the normalization coefficient and the specific method of the normalization process.
  • the length N sb of the amplitude vector and the phase vector may be the number of subbands included in the frequency domain occupied bandwidth of the CSI measurement resource configured for the terminal device, or signaling of the reporting band Length, or, the number of subbands to be reported.
  • the number of subbands to be reported may be less than or equal to N sb of. Therefore, the network device may determine the precoding vector of each subband according to the position of the subband to be reported as indicated by the reporting band or other signaling.
  • the length of the frequency domain vector is determined according to the number of subbands included in the frequency domain occupied bandwidth of the CSI measurement resource or the signaling length of the reporting band, and the change law of the channel in multiple consecutive subbands can be passed through the frequency domain vector
  • the frequency domain determined according to the number of subbands in the frequency domain occupied bandwidth of the CSI measurement resource or the signaling length of the reporting band The vector can more accurately reflect the changing law of the channel in the frequency domain, and the precoding vector recovered based on the feedback can also be more adapted to the channel.
  • the specific method for the network device listed above to determine the precoding vector corresponding to the n sb subband according to the first indication information is only an example, and should not constitute any limitation to this application. The present application does not exclude the possibility that the network device uses other methods to determine the precoding vector corresponding to the n sb subband according to the first indication information.
  • the two polarization directions may share the same L beam vectors, or different L beam vectors may be used .
  • the two polarization directions can share the same amplitude component vector, or different amplitude component vectors can be used.
  • the two polarization directions can share the same phase component vector, or different phase component vectors can be used.
  • the terminal device may separately send first indication information for each polarization direction, and each first indication information may correspond to one polarization direction.
  • the terminal device may indicate the L beam vectors only once to avoid unnecessary overhead caused by repeated indications. Then, in the two first indication information corresponding to the two polarization directions, the indications of the L beam vectors may be common.
  • the specific manner in which the terminal device determines the L beam vectors may be similar to that described above.
  • the terminal device may project the ideal precoding vectors of each subband in a certain polarization direction onto each column vector in the beam vector set to obtain multiple projection values.
  • L beam vectors can be determined. The specific method for the terminal device to determine the L beam vectors according to the multiple projection values has been described in detail in step 2101 above, and for the sake of brevity, it will not be repeated here.
  • each set of projection values includes multiple projection values.
  • each set of projection values may be an element in a matrix with dimensions N tx ⁇ N sb calculated by B s H H. Therefore, the two sets of projection values can correspond to two matrices with dimensions N tx ⁇ N sb . For convenience of description, they are respectively denoted as a first projection matrix and a second projection matrix.
  • the terminal device can traverse i from 0 to N sb -1 to determine the sum of the modulus lengths of the ith column in the first projection matrix and the ith column in the second projection matrix, and compare the sum of the modulus lengths
  • the L columns in the beam vector set corresponding to the large L columns serve as L beam vectors.
  • the sequence number of the L columns in the beam vector set used to generate the sum of the module lengths may be the sequence number of the column where the L beam vectors are located in the beam vector set.
  • the projection values of the L columns in the first projection matrix can be used as weighting coefficients for the L beam vectors in the first polarization direction
  • the projection values of the L columns in the second projection matrix can be used as the second polarization direction Weighting coefficients of L beam vectors.
  • the terminal device may separately indicate L beam vectors corresponding to each polarization direction. Then, in the two first indication information corresponding to the two polarization directions, each first indication information includes an indication of L beam vectors in the corresponding polarization direction.
  • the terminal device may separately project the ideal precoding vectors of each subband in each polarization direction onto each vector in the beam vector set to obtain multiple projection values. According to the multiple projection values, L beam vectors corresponding to each polarization direction may be determined.
  • the specific method for the terminal device to determine the L beam vectors according to the multiple projection values has been described in detail in step 2101 above, and for the sake of brevity, it will not be repeated here.
  • the weighting coefficients of the beam vectors in each polarization direction can be determined according to the ideal precoding vectors in each polarization direction. Based on the weighting coefficients of each beam vector in different polarization directions, the terminal device may further determine one or more amplitude component vectors of each beam vector in each polarization direction and the weighting coefficients of each amplitude component vector, one of each beam vector Or multiple phase component vectors and the weighting coefficients of each phase component vector.
  • the vectors L beams on different polarization directions may share the same magnitude of a component of the vector K a.
  • the amplitude component indicates a K a vector may be shared.
  • K a terminal device determines the magnitude of a component of the vector can be specific manner similar to the above.
  • the matrix may be determined according to the magnitude of the weighting coefficient on a certain polarization direction, and to determine a K a magnitude of the amplitude component by a component of the vector of each vector set column vector projected manner.
  • the amplitude matrix two weighting coefficients are determined according to the polarization directions, respectively, and each of the column vectors in the vector set amplitude components projected to determine the K a magnitude of a component of the vector. The two methods have been described in detail above, and for the sake of brevity, they will not be repeated here.
  • each first indication information includes an indication of one or more amplitude component vectors of each beam vector in the L beam vectors in the corresponding polarization direction .
  • the terminal device can determine the corresponding one or more amplitude component vectors according to the amplitude vector corresponding to each beam vector.
  • the specific method has been described in detail above, and for the sake of brevity, it will not be repeated here. .
  • the terminal device may simultaneously determine the weighting coefficients of the amplitude component vectors. It can be understood that, since the ideal precoding vectors of the subbands in the two polarization directions may be different, the amplitude matrix in the two polarization directions may also be different, and the amplitude component vectors in the two polarization directions may also be different. Therefore, the weighting coefficients of the amplitude component vectors in the two polarization directions may also be different.
  • each first indication information may include a weighting coefficient of each amplitude component vector in the corresponding polarization direction.
  • L beam vectors in the same polarization direction share the same K p phase component vectors
  • L beam vectors in different polarization directions may also share the same K p phase component vectors. Then, in the two first indication information corresponding to the two polarization directions, the indications of the K p phase component vectors may be common.
  • the terminal device determines K p phase component vectors by projecting in the set of phase component vectors.
  • the phase matrix can be determined according to weighting coefficients in a certain polarization direction, and then K p phase component vectors can be determined by projecting each column vector in the set of phase component vectors.
  • the phase matrix may be separately determined according to the weighting coefficients in the two polarization directions, and then each column vector in the set of phase component vectors may be projected to determine K p phase component vectors.
  • each first indication information includes an indication of one or more phase component vectors of each beam vector in the L beam vectors in the corresponding polarization direction .
  • the terminal device can determine the corresponding one or more phase component vectors according to the phase vector corresponding to each beam vector through any one of implementation mode 1 or implementation mode 2.
  • implementation mode 1 or implementation mode 2 the terminal device can determine the corresponding one or more phase component vectors according to the phase vector corresponding to each beam vector through any one of implementation mode 1 or implementation mode 2.
  • the terminal device may simultaneously determine the weighting coefficients of the phase component vectors. It is understandable that since the ideal precoding vectors of the sub-bands in the two polarization directions may be different, the phase matrix in the two polarization directions may also be different, and the phase component vectors in the two polarization directions may also be different. Therefore, the weighting coefficients of the phase component vectors in the two polarization directions may also be different. Therefore, regardless of whether the two polarization directions share the same K p phase component vectors, the weighting coefficient of each phase component vector in each polarization direction can be determined according to the phase matrix in each polarization direction. Therefore, in the two first indication information corresponding to the two polarization directions, each first indication information may include a weighting coefficient of each phase component vector in the corresponding polarization direction.
  • the network device may determine the precoding vector of each subband in different polarization directions based on the received two first indication information.
  • the specific process by which the network device determines the precoding vectors of the subbands in the corresponding polarization direction based on the first indication information corresponding to each polarization direction may be the same as the specific process described in step 240 above, for simplicity, I won't repeat them here.
  • the network device may splice the two polarization directions together to obtain a precoding vector corresponding to each subband.
  • the precoding vector of the n sb subband in the first polarization direction is denoted as h 1
  • the precoding vector of n sb subbands in the second polarization direction is denoted as h 2 .
  • the precoding vector corresponding to the n sb subband can be Among them, ⁇ is the normalization coefficient, ⁇ > 0.
  • the first indication information is used to indicate and determine the specific situation of the precoding vector.
  • the terminal device may pass 2R first indication information To indicate the precoding vector in each polarization direction of each transport layer.
  • the two polarization directions may share the same L beam vectors, and any two transmission layers may also share the same L beam vectors.
  • the indications of the L beam vectors may be common.
  • the two polarization directions may share the same L beam vectors, but each transmission layer uses its own L beam vectors, respectively.
  • indications of the L beam vectors may be common.
  • each polarization direction may use its own L beam vectors
  • each transmission layer may use its own 2L beam vectors, respectively.
  • each first indication information may include indications of L beam vectors in one polarization direction of a transmission layer.
  • the two polarization directions may share the same amplitude component vector or vectors, and any two transmission layers may also share the same amplitude component vector or vectors.
  • the indication of the one or more amplitude component vectors may be common.
  • the two polarization directions may share the same amplitude component vector or vectors, but each transmission layer may use its own amplitude component vector or vectors.
  • the number of amplitude component vectors on any two transmission layers may be the same or different, which is not limited in this application.
  • indications of one or more amplitude component vectors may be common.
  • each first indication information may include an indication of one or more amplitude component vectors in one transmission layer and one polarization direction.
  • each first indication information may include a transmission layer and a weighting coefficient of each amplitude component vector in the polarization direction.
  • the two polarization directions may share the same phase component vector or vectors, and any two transmission layers may also share the same phase component vector or vectors.
  • the indication of the one or more phase component vectors may be common.
  • the two polarization directions may share the same phase component vector or vectors, but each transmission layer may use its own phase component vector or vectors.
  • the number of phase component vectors on any two transmission layers may be the same or different, which is not limited in this application.
  • the indication of one or more phase component vectors may be common among the two first indication information corresponding to each transmission layer.
  • each polarization direction may use one or more phase component vectors
  • each transmission layer may use one or more phase component vectors, respectively.
  • the number of phase component vectors on any two transmission layers may be the same or different.
  • the number of phase component vectors in any two polarization directions may be the same or different. This application does not limit this.
  • each first indication information may include an indication of one or more phase component vectors in one transmission layer and one polarization direction.
  • each first indication information may include a transmission layer and a weighting coefficient of each phase component vector in a polarization direction.
  • the network device may first determine the precoding vector of each subband in different polarization directions based on the received 2R first indication information, and then determine the precoding vector of each subband on different transmission layers, thereby determining the Precoding matrix.
  • the specific process for the network device to determine the precoding vector of each subband in the corresponding polarization direction based on the first indication information corresponding to each transmission layer and each polarization direction may be the same as the specific process described in step 240 above The same, for the sake of brevity, will not repeat them here.
  • the network device can stitch together the same transmission layer and two polarization directions to obtain the The precoding vector corresponding to each subband. Then, the precoding vectors of the same subband in different transmission layers can be spliced together to obtain a precoding matrix corresponding to each self-band.
  • the precoding vector of the n sb subband in the first polarization direction on the first transmission layer is denoted as h 1,1 , and in the second polarization direction
  • the precoding vectors for n sb subbands are denoted as h 1,2 ;
  • the precoding vectors for the n sb subband in the first polarization direction on the second transmission layer are denoted as h 2,1 , and n sb in the second polarization direction
  • the precoding vector of the subbands is denoted as h 2,2 .
  • the precoding vector corresponding to the n sb subband can be Among them, ⁇ is the normalization coefficient, ⁇ > 0.
  • the terminal device can feed back the weighting coefficient of each beam vector in each subband to the network device through the amplitude component vector and its weighting coefficient, the phase component vector and its weighting coefficient.
  • the weighted sum of the amplitude component vectors corresponding to each beam vector can be used to determine the amplitude coefficients of a beam vector in multiple subbands
  • the weighted sum of the phase component vectors corresponding to each beam vector can be used to determine a beam vector in multiple subbands 'S phase coefficient. Therefore, the network device can determine the weighting coefficient of each beam vector on each subband according to the amplitude component vector and its weighting coefficient, phase component vector and its weighting coefficient indicated by the terminal device, and then determine the precoding vector of each subband .
  • this feedback method can be understood as a sub-band joint feedback method.
  • the terminal device does not need to make separate feedback on the amplitude coefficient and phase coefficient of each subband.
  • the weighted sum of one or more amplitude component vectors and the weighted sum of one or more phase component vectors are used to approximately represent the amplitude vector and phase vector of each beam vector. Compression, on the basis of ensuring approximate accuracy, greatly reduces the feedback overhead.
  • the communication device 1000 may include a communication unit 1100 and a processing unit 1200.
  • the communication device 1000 may correspond to the terminal device in the foregoing method embodiment, for example, it may be a terminal device, or a chip configured in the terminal device.
  • the communication device 1000 may correspond to the terminal device in the method 200 according to an embodiment of the present application, and the communication device 1000 may include a unit for performing the method performed by the terminal device in the method 200 in FIG. 2.
  • each unit in the communication device 1000 and the other operations and / or functions described above are respectively for implementing the corresponding flow of the method 200 in FIG. 2.
  • the communication unit 1100 can be used to perform steps 220 and 230 in the method 200, and the processing unit 1200 can be used to perform step 210 in the method 200 (including step 2101 To step 2105).
  • the communication unit 1100 in the communication device 1000 may correspond to the transceiver 2020 in the terminal device 2000 shown in FIG. 5, and the processing unit 1200 in the communication device 1000 may It corresponds to the processor 2010 in the terminal device 2000 shown in FIG. 5.
  • the communication unit 1100 in the communication device 1000 may be an input / output interface.
  • the communication device 1000 may correspond to the network device in the foregoing method embodiment, for example, it may be a network device, or a chip configured in the network device.
  • the communication device 1000 may correspond to the network device in the foregoing method embodiment, for example, it may be a network device, or a chip configured in the network device.
  • the communication device 1000 may correspond to the network device in the method 200 according to an embodiment of the present application, and the communication device 1000 may include a unit for performing the method performed by the network device in the method 200 in FIG. 2.
  • each unit in the communication device 1000 and the other operations and / or functions described above are respectively for implementing the corresponding flow of the method 200 in FIG. 2.
  • the communication unit 1100 can be used to perform steps 220 and 230 in the method 200, and the processing unit 1200 can be used to perform step 240 in the method 200.
  • the communication unit in the communication device 1000 may correspond to the transceiver 3200 in the network device 3000 shown in FIG. 6, and the processing unit 1200 in the communication device 1000 may This corresponds to the processor 3100 in the network device 3000 shown in FIG. 6.
  • the communication unit 1100 in the communication device 1000 may be an input / output interface.
  • FIG. 5 is a schematic structural diagram of a terminal device 2000 provided by an embodiment of the present application.
  • the terminal device 2000 can be applied to the system shown in FIG. 1 to perform the functions of the terminal device in the above method embodiments.
  • the terminal device 2000 includes a processor 2010 and a transceiver 2020.
  • the terminal device 2000 further includes a memory 2030.
  • the processor 2010, the transceiver 2002 and the memory 2030 can communicate with each other through an internal connection path to transfer control and / or data signals.
  • the memory 2030 is used to store a computer program, and the processor 2010 is used from the memory 2030 Call and run the computer program to control the transceiver 2020 to send and receive signals.
  • the terminal device 2000 may further include an antenna 2040 for sending uplink data or uplink control signaling output by the transceiver 2020 through a wireless signal.
  • the processor 2010 and the memory 2030 may be combined into a processing device.
  • the processor 2010 is used to execute the program code stored in the memory 2030 to implement the above-mentioned functions.
  • the memory 2030 may also be integrated in the processor 2010 or independent of the processor 2010.
  • the processor 2010 may correspond to the processing unit in FIG. 4.
  • the above-mentioned transceiver 2020 may correspond to the communication unit in FIG. 4 and may also be called a transceiver unit.
  • the transceiver 2020 may include a receiver (or receiver, receiving circuit) and a transmitter (or transmitter, transmitting circuit). Among them, the receiver is used to receive signals, and the transmitter is used to transmit signals.
  • the terminal device 2000 shown in FIG. 5 can implement various processes involving the terminal device in the method embodiment shown in FIG. 2.
  • the operations and / or functions of each module in the terminal device 2000 are respectively to implement the corresponding processes in the above method embodiments.
  • the above-mentioned processor 2010 may be used to perform the actions described in the foregoing method embodiments that are internally implemented by the terminal device, and the transceiver 2020 may be used to perform the operations described in the foregoing method embodiments by the terminal device to or from the network device. action.
  • the transceiver 2020 may be used to perform the operations described in the foregoing method embodiments by the terminal device to or from the network device. action.
  • the terminal device 2000 may further include a power supply 2050, which is used to provide power to various devices or circuits in the terminal device.
  • a power supply 2050 which is used to provide power to various devices or circuits in the terminal device.
  • the terminal device 2000 may further include one or more of an input unit 2060, a display unit 2070, an audio circuit 2080, a camera 2090, a sensor 2100, etc. It may also include a speaker 2082, a microphone 2084, and so on.
  • FIG. 6 is a schematic structural diagram of a network device provided by an embodiment of the present application, for example, may be a schematic structural diagram of a base station.
  • the base station 3000 can be applied to the system shown in FIG. 1 to perform the functions of the network device in the above method embodiments.
  • the base station 3000 may include one or more radio frequency units, such as a remote radio unit (RRU) 3100 and one or more baseband units (BBU) (also called a distributed unit (DU) )) 3200.
  • the RRU 3100 may be referred to as a transceiver unit, which corresponds to the communication unit 1200 in FIG. 4.
  • the transceiver unit 3100 may also be called a transceiver, a transceiver circuit, or a transceiver, etc., which may include at least one antenna 3101 and a radio frequency unit 3102.
  • the transceiving unit 3100 may include a receiving unit and a transmitting unit, the receiving unit may correspond to a receiver (or receiver, receiving circuit), and the transmitting unit may correspond to a transmitter (or transmitter, transmitting circuit).
  • the RRU 3100 part is mainly used for the transmission and reception of radio frequency signals and the conversion of radio frequency signals and baseband signals, for example, for sending instruction information to terminal devices.
  • the BBU 3200 part is mainly used for baseband processing and controlling the base station.
  • the RRU 3100 and the BBU 3200 may be physically arranged together, or may be physically separated, that is, distributed base stations.
  • the BBU 3200 is the control center of the base station, and may also be referred to as a processing unit. It may correspond to the processing unit 1100 in FIG.
  • the BBU processing unit
  • the BBU may be used to control the base station to perform the operation flow on the network device in the above method embodiment, for example, to generate the above instruction information.
  • the BBU 3200 may be composed of one or more boards, and multiple boards may jointly support a wireless access network (such as an LTE network) of a single access standard, or may support different access standards respectively. Wireless access network (such as LTE network, 5G network or other networks).
  • the BBU 3200 also includes a memory 3201 and a processor 3202.
  • the memory 3201 is used to store necessary instructions and data.
  • the processor 3202 is used to control the base station to perform necessary actions, for example, to control the base station to execute the operation flow of the network device in the foregoing method embodiment.
  • the memory 3201 and the processor 3202 may serve one or more single boards. In other words, the memory and processor can be set separately on each board. It is also possible that multiple boards share the same memory and processor. In addition, each board can also be provided with necessary circuits.
  • the base station 3000 shown in FIG. 6 can implement various processes involving network devices in the method embodiment of FIG. 2.
  • the operations and / or functions of each module in the base station 3000 are to implement the corresponding processes in the above method embodiments.
  • the above-mentioned BBU 3200 can be used to perform the actions described in the foregoing method embodiments that are internally implemented by the network device, and the RRU 3100 can be used to perform the actions described in the previous method embodiments that the network device sends to or receives from the terminal device.
  • the RRU 3100 can be used to perform the actions described in the previous method embodiments that the network device sends to or receives from the terminal device.
  • An embodiment of the present application further provides a processing device, including a processor and an interface; the processor is used to perform the communication method in any of the foregoing method embodiments.
  • the above processing device may be a chip.
  • the processing device may be a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), or a system chip (SoC), or It is a central processor (CPU), it can also be a network processor (NP), it can also be a digital signal processing circuit (digital signal processor, DSP), or a microcontroller (micro controller) , MCU), can also be a programmable controller (programmable logic device, PLD) or other integrated chips.
  • FPGA field programmable gate array
  • ASIC application specific integrated circuit
  • SoC system chip
  • CPU central processor
  • NP network processor
  • DSP digital signal processor
  • microcontroller micro controller
  • MCU microcontroller
  • PLD programmable logic device
  • each step of the above method may be completed by an integrated logic circuit of hardware in the processor or instructions in the form of software.
  • the steps of the method disclosed in conjunction with the embodiments of the present application may be directly embodied and executed by a hardware processor, or may be executed and completed by a combination of hardware and software modules in the processor.
  • the software module may be located in a mature storage medium in the art, such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, an electrically erasable programmable memory, and a register.
  • the storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware. In order to avoid repetition, they are not described in detail here.
  • the processor in the embodiment of the present application may be an integrated circuit chip with signal processing capabilities.
  • each step of the foregoing method embodiment may be completed by an integrated logic circuit of hardware in a processor or instructions in the form of software.
  • the aforementioned processor may be a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components .
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • the methods, steps, and logical block diagrams disclosed in the embodiments of the present application may be implemented or executed.
  • the general-purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
  • the steps of the method disclosed in conjunction with the embodiments of the present application may be directly embodied and executed by a hardware decoding processor, or may be executed and completed by a combination of hardware and software modules in the decoding processor.
  • the software module may be located in a mature storage medium in the art, such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, an electrically erasable programmable memory, and a register.
  • the storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.
  • the memory in the embodiments of the present application may be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory.
  • the non-volatile memory can be read-only memory (read-only memory, ROM), programmable read-only memory (programmable ROM, PROM), erasable programmable read-only memory (erasable PROM, EPROM), electronically Erase programmable EPROM (EEPROM) or flash memory.
  • the volatile memory may be a random access memory (random access memory, RAM), which is used as an external cache.
  • RAM random access memory
  • SRAM static random access memory
  • DRAM dynamic random access memory
  • DRAM synchronous dynamic random access memory
  • SDRAM synchronous dynamic random access memory
  • double data rate synchronous dynamic random access memory double data SDRAM, DDR SDRAM
  • enhanced synchronous dynamic random access memory enhanced SDRAM, ESDRAM
  • serial link DRAM SLDRAM
  • direct RAMbus RAM direct RAMbus RAM
  • the present application also provides a computer program product, the computer program product includes: computer program code, when the computer program code runs on the computer, the computer is caused to execute the embodiment shown in FIG. 2 The method of any one of the embodiments.
  • the present application also provides a computer-readable medium that stores program code, and when the program code runs on a computer, the computer is caused to execute the embodiment shown in FIG. 2 The method of any one of the embodiments.
  • the present application further provides a system, which includes the foregoing one or more terminal devices and one or more network devices.
  • the computer program product includes one or more computer instructions.
  • the computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices.
  • the computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be from a website site, computer, server or data center Transmission to another website, computer, server or data center via wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.).
  • the computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device including a server, a data center, and the like integrated with one or more available media.
  • the usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a high-density digital video disc (DVD)), or a semiconductor medium (for example, a solid state disk, SSD)) etc.
  • a magnetic medium for example, a floppy disk, a hard disk, a magnetic tape
  • an optical medium for example, a high-density digital video disc (DVD)
  • DVD high-density digital video disc
  • SSD solid state disk
  • the network device in each of the above device embodiments corresponds exactly to the network device or terminal device in the terminal device and method embodiments, and the corresponding steps are performed by the corresponding modules or units, for example, the communication unit (transceiver) performs the receiving or The steps of sending, other than sending and receiving, can be executed by the processing unit (processor).
  • the function of the specific unit can refer to the corresponding method embodiment. There may be one or more processors.
  • a component may be, but is not limited to, a process running on a processor, a processor, an object, an executable file, an execution thread, a program, and / or a computer.
  • the application running on the computing device and the computing device can be components.
  • One or more components can reside in a process and / or thread of execution, and a component can be localized on one computer and / or distributed between 2 or more computers.
  • these components can execute from various computer readable media having various data structures stored thereon.
  • the component may, for example, be based on a signal having one or more data packets (eg, data from two components that interact with another component between the local system, the distributed system, and / or the network, such as the Internet that interacts with other systems through signals) Communicate through local and / or remote processes.
  • data packets eg, data from two components that interact with another component between the local system, the distributed system, and / or the network, such as the Internet that interacts with other systems through signals
  • the disclosed system, device, and method may be implemented in other ways.
  • the device embodiments described above are only schematic.
  • the division of the units is only a division of logical functions.
  • there may be other divisions for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not implemented.
  • the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
  • each functional unit may be implemented in whole or in part by software, hardware, firmware, or any combination thereof.
  • software When implemented using software, 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 instructions (programs). When the computer program instructions (programs) are loaded and executed on a 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 devices.
  • the computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be from a website site, computer, server or data center Transmit to another website, computer, server or data center by wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.).
  • the computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device including a server, a data center, and the like integrated with one or more available media.
  • the usable medium may be a magnetic medium (eg, floppy disk, hard disk, magnetic tape), optical medium (eg, DVD), or semiconductor medium (eg, solid state disk (SSD)), or the like.
  • the function is implemented in the form of a software functional unit and sold or used as an independent product, it may be stored in a computer-readable storage medium.
  • the technical solution of the present application essentially or part of the contribution to the existing technology or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to enable a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application.
  • the aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), magnetic disk or optical disk and other media that can store program codes .

Abstract

La présente invention concerne un procédé d'indication et de détermination de vecteur de précodage et un dispositif de communication, et le procédé est destiné à réduire le surdébit de rétroaction. Le procédé comprend les étapes suivantes dans lesquelles : un dispositif terminal génère et envoie des premières informations d'indication, les premières informations d'indication indiquant L vecteurs de faisceaux, un ou plusieurs vecteurs de composante d'amplitude correspondant à chaque vecteur de faisceau, un coefficient de pondération de chaque vecteur de composante d'amplitude, un ou plusieurs vecteurs de composante de phase, et un coefficient de pondération de chaque vecteur de composante de phase ; utilise un ou plusieurs vecteurs de composante d'amplitude correspondant à un lème vecteur de faisceau et un coefficient de pondération de chaque vecteur de composante d'amplitude pour construire un vecteur d'amplitude du lème vecteur de faisceau, et utilise un ou plusieurs vecteurs de composante de phase correspondant au lème vecteur de faisceau et un coefficient de pondération de chaque vecteur de composante de phase pour construire un vecteur de phase du lème vecteur de faisceau, le vecteur d'amplitude et le vecteur de phase du lème vecteur de faisceau étant utilisés pour déterminer un vecteur de coefficient de pondération du lème vecteur de faisceau. Le vecteur de coefficient de pondération comprend Nsb coefficients de pondération correspondant à Nsb sous-bandes.
PCT/CN2019/106998 2018-10-08 2019-09-20 Procédé d'indication et de détermination de vecteur de précodage et dispositif de communication WO2020073788A1 (fr)

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