WO2020143580A1 - Procédé d'indication de vecteur pour la construction d'un vecteur de précodage, et appareil de communication - Google Patents

Procédé d'indication de vecteur pour la construction d'un vecteur de précodage, et appareil de communication Download PDF

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Publication number
WO2020143580A1
WO2020143580A1 PCT/CN2020/070495 CN2020070495W WO2020143580A1 WO 2020143580 A1 WO2020143580 A1 WO 2020143580A1 CN 2020070495 W CN2020070495 W CN 2020070495W WO 2020143580 A1 WO2020143580 A1 WO 2020143580A1
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WIPO (PCT)
Prior art keywords
frequency domain
reported
vector
domain unit
vectors
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PCT/CN2020/070495
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English (en)
Chinese (zh)
Inventor
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 WO2020143580A1 publication Critical patent/WO2020143580A1/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
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • 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
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • 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
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
    • 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
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0636—Feedback format
    • H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection

Definitions

  • the present application relates to the field of communication, and more specifically, to a vector indication method and communication device for constructing a precoding vector.
  • massive multiple-input multiple-output (Massive MIMO) technology network equipment can reduce interference between multiple users and interference between multiple signal streams of the same user through precoding technology. Thereby 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 hope that through feedback, the network device obtains a precoding vector that is the same as or similar to the precoding vector determined by the terminal device.
  • the terminal device may indicate the precoding vector to the network device through a feedback method combining space domain compression and frequency domain compression. Specifically, the terminal device may select one or more space domain vectors and one or more frequency domain vectors based on the precoding vectors of each frequency domain unit on each transmission layer, so that the matrix of the matrix constructed by the space domain vectors and frequency domain vectors The weighted sum is used to fit the precoding vector corresponding to each frequency domain unit on each transmission layer.
  • the present application provides a vector indication method and a communication device for constructing a precoding vector, in order to clarify the length of the frequency domain vector, and then determine the frequency domain vector for constructing the precoding vector.
  • a vector indication method for constructing 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, where the first indication information is used to indicate one or more frequency domain vectors, and the one or more frequency domain vectors are used to construct one or more frequency domain unit groups
  • the precoding vector corresponding to each frequency domain unit, the length of the frequency domain vector N f is from the frequency domain unit in the frequency domain unit from the first frequency domain unit to be reported to the last frequency domain unit
  • the number Q of domain units is determined, where the frequency domain unit group includes one or more frequency domain units, and the bandwidth occupied by the frequency domain unit group is part or all of the bandwidth occupied by the frequency domain of the reported bandwidth; N f and Q are all positive integers; send the first indication information.
  • the terminal device determines the length of the frequency domain vector based on the number of frequency domain units contained in the bandwidth occupied by the frequency domain unit from the first frequency domain unit to the last frequency domain unit in the frequency domain unit group , Can make the selected frequency domain vector can maintain the continuity of the frequency domain, and can more accurately reflect the changing law of the channel in the frequency domain. Therefore, it is beneficial to obtain higher feedback accuracy, so that the precoding vector recovered by the network device based on the feedback of the terminal device can be better adapted to the channel, which is further beneficial to improve the subsequent data transmission performance.
  • the selected frequency domain vector does not really simulate the changing law of channels on consecutive frequency domain units, so It cannot accurately reflect the changing law of the channel in the frequency domain, the feedback accuracy is affected, and the subsequent data transmission performance may also be affected.
  • the generating the first indication information includes: generating the first if the frequency domain unit to be reported in the frequency domain unit group meets a preset condition One instruction.
  • the terminal device may determine whether to use the method provided in the embodiment of the present application to feed back information for constructing the precoding vector according to the frequency domain unit to be reported. For example, when the frequency domain units to be reported are more continuously distributed in frequency domain resources, the method provided in the embodiment of the present application may be used to feed back the information used to construct the precoding vector; for example, when the frequency domain units to be reported When the number is large, the method provided in the embodiment of the present application may be used to feed back the information used to construct the precoding vector.
  • the method further includes: receiving second indication information, where the second indication information is used to indicate the number and location of frequency domain units to be reported.
  • the network device may indicate the number and location of frequency domain units to be reported to the terminal device through the second indication information, so that the terminal device determines whether to use the embodiment of the present application according to the number and/or location of frequency domain units to be reported
  • a method is provided to feed back the information used to construct the precoding vector, and the length of the frequency domain vector used for frequency domain compression can be further determined.
  • the second indication information may be, for example, the reporting bandwidth (csi-ReportingBand) in the channel state information (channel) state information (CSI) reporting configuration (CSI-ReportConfig).
  • the csi-ReportingBand indicates the number and position of subbands to be reported through a bitmap.
  • the number and position of the frequency domain unit to be reported may be determined based on the predetermined granularity relationship between the frequency domain unit and the subband . Therefore, the csi-ReportingBand can indirectly indicate the number and location of frequency domain units to be reported.
  • csi-ReportingBand is only an example of the second indication information, and should not constitute any limitation to this application. This application does not exclude other existing signaling or newly added signaling to indicate the number and location of frequency domain units to be reported.
  • a vector indication method for constructing 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, where the first indication information is used to indicate one or more frequency domain vectors, and the one or more frequency domain vectors are used to construct one or more frequency domain unit groups
  • the precoding vector corresponding to each frequency domain unit, the length of the frequency domain vector N f is from the frequency domain unit in the frequency domain unit from the first frequency domain unit to be reported to the last frequency domain unit
  • the number Q of domain units is determined, where the frequency domain unit group includes one or more frequency domain units, and the bandwidth occupied by the frequency domain unit group is part or all of the bandwidth occupied by the frequency domain of the reported bandwidth; N f and Q are all positive integers; one or more frequency domain vectors are determined according to the first indication information.
  • the length of the frequency domain vector is determined based on the number of frequency domain units included in the bandwidth occupied by the frequency domain unit from the first frequency domain unit to the last frequency domain unit in the frequency domain unit group.
  • the selected frequency domain vector can maintain the continuity of the frequency domain, and can more accurately reflect the changing law of the channel in the frequency domain. Therefore, it is beneficial to obtain a higher feedback accuracy, so that the precoding vector recovered by the network device based on the feedback of the terminal device can be better adapted to the channel, which is further beneficial to improve the subsequent data transmission performance.
  • the selected frequency domain vector does not really simulate the changing law of channels on consecutive frequency domain units, so It cannot accurately reflect the changing law of the channel in the frequency domain, the feedback accuracy is affected, and the subsequent data transmission performance may also be affected.
  • the determining the one or more frequency domain vectors according to the first indication information includes: the frequency domain unit to be reported in the frequency domain unit group meets In the case of preset conditions, one or more frequency domain vectors are determined according to the first indication information.
  • the terminal device may determine whether to use the method provided in the embodiment of the present application to determine the length of the frequency domain vector according to the frequency domain unit to be reported, and feed back the precoding vector based on the dual domain compression method.
  • the method provided in the embodiment of the present application may be used to determine the length of the frequency domain vector, and the precoding vector is fed back based on the method of dual domain compression; and
  • the method provided in the embodiment of the present application may be used to determine the length of the frequency domain vector, and the precoding vector is fed back based on the dual domain compression method.
  • the method further includes: sending second indication information, where the second indication information is used to indicate the number and location of frequency domain units to be reported.
  • the network device may indicate the number and location of frequency domain units to be reported to the terminal device through the second indication information, so that the terminal device determines whether to use the embodiment of the present application according to the number and/or location of frequency domain units to be reported
  • the provided method determines the length of the frequency domain vector, and feeds back the precoding vector based on the dual-domain compression method, and can further determine the length of the frequency domain vector for frequency domain compression.
  • the second indication information may be, for example, the reporting bandwidth (csi-ReportingBand) in the channel state information (channel) state information (CSI) reporting configuration (CSI-ReportConfig).
  • the csi-ReportingBand indicates the number and position of subbands to be reported through a bitmap.
  • the number and position of the frequency domain unit to be reported may be determined based on the predetermined granularity relationship between the frequency domain unit and the subband . Therefore, the csi-ReportingBand can indirectly indicate the number and location of frequency domain units to be reported.
  • csi-ReportingBand is only an example of the second indication information, and should not constitute any limitation to this application. This application does not exclude other existing signaling or newly added signaling to indicate the number and location of frequency domain units to be reported.
  • the preset condition includes: the number of frequency domain units to be reported in the frequency domain unit group is greater than or equal to x ⁇ Q, where x is a predefined value , 0 ⁇ x ⁇ 1.
  • the method provided in the embodiment of the present application may be used to determine the length of the frequency domain vector and based on dual domain compression Method to feed back precoding vectors.
  • x is 0.5.
  • x of 0.5 is only one possible value of x provided in this application, and should not constitute any limitation to this application.
  • N f Q.
  • a set of frequency domain vectors of different lengths can be predefined in the frequency domain vector set.
  • the terminal device determines the Q value, it can directly select a frequency domain vector with a length equal to the Q value from the set of frequency domain vectors.
  • the length of the frequency domain vector determined based on this method makes the selected frequency domain vector maintain the continuity of the frequency domain, which is beneficial to obtain higher feedback accuracy.
  • N f Q.
  • the terminal device determines the Q value, it can select a frequency domain vector with a length greater than the Q value from the set of frequency domain vectors.
  • the length of the frequency domain vector determined based on this method enables the selected frequency domain vector to maintain the continuity of the frequency domain, which is beneficial to obtain higher feedback accuracy.
  • a method for reporting a precoding matrix indicator (precoding matrix indicator (PMI)) 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 a PMI; where the frequency domain unit to be reported in the frequency domain unit group satisfies a preset condition, the PMI includes an indication of one or more frequency domain vectors, and the one or more The frequency domain vector is a part of the frequency domain vector in the frequency domain vector group.
  • the frequency domain vector group includes a plurality of frequency domain vectors, and the plurality of frequency domain vectors are mutually orthogonal to each other; in the frequency domain unit group When the reported frequency domain unit does not satisfy the preset condition, the PMI does not include an indication of the frequency domain vector; wherein, the frequency domain unit group includes one or more frequency domain units, and the frequency domain unit group occupies The bandwidth is the frequency domain where the reported bandwidth occupies part or all of the bandwidth; the PMI is sent.
  • a method for reporting PMI is provided.
  • the method may be performed by a network device or may be performed by a chip configured in the network device.
  • the method includes: receiving a PMI; where the frequency domain unit to be reported in the frequency domain unit group satisfies a preset condition, the PMI includes an indication of one or more frequency domain vectors, and the one or more The frequency domain vector is a part of the frequency domain vector in the frequency domain vector group.
  • the frequency domain vector group includes a plurality of frequency domain vectors and the two frequency domain vectors are mutually orthogonal to each other; to be reported in the frequency domain unit group If the frequency domain unit does not satisfy the preset condition, the PMI does not include an indication of the frequency domain vector; wherein, the frequency domain unit group includes one or more frequency domain units, and the bandwidth occupied by the frequency domain unit group To occupy part or all of the bandwidth in the frequency domain for reporting bandwidth; according to the PMI and whether the frequency domain unit to be reported in the frequency domain unit group satisfies the preset condition, determine the precoding matrix corresponding to each frequency domain unit.
  • a method of selecting a part of frequency domain vectors from the frequency domain vector group and reporting to construct a precoding vector is called a first compression method; the entire frequency domain vector group is used to construct a precoding method.
  • the method of encoding vectors is called a second compression method based on frequency domain transformation.
  • the terminal device may determine a reasonable feedback method according to the number and/or location of frequency domain units to be reported.
  • feedback methods including the feedback method of type II (type II) codebook and the feedback method based on dual-domain compression (including the above-mentioned first compression method and second compression method)
  • the feedback overhead and feedback accuracy are comprehensively considered to Achieve the effect of higher feedback accuracy at the same cost.
  • the preset condition includes: the number of frequency domain units to be reported in the frequency domain unit group is greater than or equal to x ⁇ Q, where x is a predefined value, 0 ⁇ x ⁇ 1, Q represents the number of frequency domain units to be reported in the bandwidth occupied by the frequency domain unit from the first frequency domain unit to the last frequency domain unit to be reported in this frequency domain unit group, Q is positive Integer.
  • a part of the frequency domain vectors can be selected from the frequency domain vector group as the frequency domain for constructing the precoding vector vector.
  • the preset condition includes: the number of frequency domain units to be reported in the frequency domain unit group is greater than or equal to a preset threshold.
  • all frequency domain vectors in the frequency domain vector group may be used as frequency domain vectors for constructing a precoding vector.
  • the length N f of the frequency domain vector is selected from the first in the frequency domain unit group
  • the number Q of frequency domain units to be reported from the frequency domain unit to be reported to the last frequency domain unit to be reported in the bandwidth occupied by the frequency domain unit to be reported is determined, and N f and Q are both positive integers.
  • the length of the frequency domain vector is determined based on the number of frequency domain units included in the bandwidth from the first frequency domain unit to be reported to the last frequency domain unit in the frequency domain unit group, so that the selected frequency domain vector can be made It can maintain the continuity of the frequency domain, and can more accurately reflect the changing law of the channel in the frequency domain. Therefore, it is beneficial to obtain a higher feedback accuracy, so that the precoding vector recovered by the network device based on the feedback of the terminal device can be better adapted to the channel, which is further beneficial to improve the subsequent data transmission performance.
  • the frequency domain unit to be reported in the frequency domain unit group does not satisfy the preset condition, if the PMI includes an indication of the frequency domain vector group, the The length N 4 of the frequency domain vector in the frequency domain vector group is determined by the number of frequency domain units to be reported in the frequency domain unit group, and N 4 is a positive integer.
  • the number of subbands it may be considered to use the entire frequency domain vector group to construct a precoding vector.
  • the length of the frequency domain vector is determined according to the number of frequency domain units to be reported, that is, the same number of frequency domain vectors as the number of frequency domain vectors are selected to construct the precoding vector.
  • the frequency domain vector used to construct the precoding vector can be reduced, so that the number of weighting coefficient reports can be reduced, which is beneficial to reduce feedback overhead.
  • a communication device including various modules or units for performing the method in the first aspect or the third aspect and any possible implementation manner of the first aspect or the third 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 first aspect or the third aspect and the method in any possible implementation manner of the first aspect or the third 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 one of the second aspect or the fourth aspect and any possible implementation manner of the second aspect or the fourth 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 second aspect or the fourth aspect and the method in any possible implementation manner of the second aspect or the fourth 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 a signal through the input circuit and transmit a signal through the output circuit, so that the processor executes any of the first aspect to the fourth aspect and any possible implementation manner of the first aspect to the fourth aspect The method.
  • 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 a 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 any of the first aspect to the fourth aspect and any possible implementation manner of the first aspect to the fourth 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.
  • 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 data output by the processor 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 above tenth aspect may be one or more chips, 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.;
  • the processor 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, may be located outside the processor, and exists independently.
  • a computer program product includes: a computer program (also referred to as code or instructions) that, when the computer program is executed, causes a computer to perform the first aspect to The fourth aspect and the method in any possible implementation manner of the first aspect to the fourth 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 above-mentioned first aspect to The fourth aspect and the method in any possible implementation manner of the first aspect to the fourth aspect.
  • a computer program also may be referred to as code or instructions
  • a communication system including the aforementioned network device and terminal device.
  • FIG. 1 is a schematic diagram of a communication system applicable to a vector indicating method for constructing a precoding vector according to an embodiment of the present application;
  • FIG. 2 is a schematic flowchart of a vector indicating method for constructing a precoding vector provided by an embodiment of the present application
  • 3 and 4 are schematic diagrams of frequency domain unit groups and reporting bandwidth provided by embodiments of the present application.
  • FIG. 5 is a schematic diagram of a bitmap, a reporting bandwidth, and a frequency domain unit group provided by an embodiment of this application;
  • FIG. 6 is a schematic flowchart of a method for reporting PMI according to another embodiment of the present application.
  • FIG. 7 is a schematic block diagram of a communication device provided by an embodiment of the present application.
  • FIG. 8 is a schematic structural diagram of a terminal device provided by an embodiment of the present application.
  • FIG. 9 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
  • WiMAX worldwide interoperability for microwave access
  • FIG. 1 is a schematic diagram of a communication system 100 suitable for a vector indication method for constructing 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 (for example, home evolved NodeB, or home Node B, HNB), baseband unit (BBU), wireless fidelity (WiFi) system Access point (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
  • gNB may include a centralized unit (CU) and DU.
  • the gNB may also include a radio unit (RU).
  • the CU implements some functions of gNB, and the DU implements some functions of gNB.
  • CU implements radio resource control (RRC), packet data convergence protocol (PDCP) layer functions
  • DU implements radio link control (RLC), media access control (media access control, MAC) and physical (PHY) layer functions. Since the information of the RRC layer will eventually become the information of the PHY layer or be transformed from the information of the PHY layer, under this architecture, high-level signaling, such as RRC layer signaling, can also be considered to be sent by the DU , Or, sent by DU+CU.
  • RRC radio resource control
  • PDCP packet data convergence protocol
  • RLC radio link control
  • MAC media access control
  • PHY physical
  • 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 may be divided into network devices in a radio access network (RAN), and may also be divided into network devices in a core network (CN), which is not limited in this application.
  • RAN radio access network
  • CN core network
  • 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.
  • UE user equipment
  • the terminal device in the embodiment of the present application may be a mobile phone, a tablet computer, a computer with wireless transceiver function, a virtual reality (virtual reality, VR) terminal device, and an augmented reality (augmented reality, AR) terminal 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, safety terminals in smart cities, wireless terminals in smart homes, etc.
  • the embodiments of the present application do not limit application scenarios.
  • FIG. 1 is only a simplified schematic diagram for ease of understanding and examples.
  • the communication system 100 may also 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 the network device, or may also be performed by a chip configured in the network device. For convenience of explanation, they are collectively referred to as network devices hereinafter.
  • the network device can process the code word on the physical channel.
  • the codeword may be coded bits that have been coded (eg, including channel coding).
  • the codeword is scrambled to generate 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 sending device (such as a 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 and the channel It is adapted to reduce the complexity of receiving devices (such as terminal devices) 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 channel information (such as, but not limited to, channel matrix) cannot be obtained, pre-coding is performed using a pre-coding matrix or a weighting processing method set in advance. For brevity, the specific content of this article will not be repeated here.
  • channel information such as, but not limited to, channel matrix
  • PMI Precoding matrix and precoding matrix indicator
  • the precoding matrix may be, for example, a precoding matrix corresponding to each frequency domain unit determined by the terminal device based on the channel matrix of each frequency domain unit (eg, subband).
  • the channel matrix may be determined by the terminal device through channel estimation or other methods or based on channel reciprocity.
  • the specific method for the terminal device to determine the channel matrix is not limited to the above, and the specific implementation manner may refer to the existing technology.
  • the precoding matrix can be obtained by singular value decomposition (SVD) of the channel matrix or the covariance matrix of the channel matrix, or by eigenvalue decomposition (eigenvalue decomposition) of the covariance matrix of the channel matrix. EVD).
  • SVD singular value decomposition
  • eigenvalue decomposition eigenvalue decomposition
  • the precoding matrix corresponding to the frequency domain unit may refer to the precoding matrix fed back for the frequency domain unit, for example, it may be performed based on the reference signal on the frequency domain unit Precoding matrix for channel measurement and feedback.
  • the precoding matrix corresponding to the frequency domain unit may be used as a precoding matrix for precoding subsequent data transmitted through the frequency domain unit.
  • the precoding matrix corresponding to the frequency domain unit may also be simply referred to as the precoding matrix of the frequency domain unit
  • the precoding vector corresponding to the frequency domain unit may also be referred to as the precoding vector of the frequency domain unit.
  • the precoding matrix determined by the network device based on the feedback of the terminal device may be directly used for downlink data transmission; it may also go through some beamforming methods, for example, including zero forcing (zero forcing, ZF), regularized zero-forcing (RZF), minimum mean square error (MMSE), signal-to-leakage-and-noise (SLNR), etc.
  • ZF zero forcing
  • RZF regularized zero-forcing
  • MMSE minimum mean square error
  • SLNR signal-to-leakage-and-noise
  • the precoding matrix (or vector) referred to below may refer to the precoding matrix (or vector) determined by the network device based on feedback from the terminal device.
  • a precoding matrix may include one or more vectors, such as column vectors. A precoding matrix can be used to determine one or more precoding vectors.
  • the precoding vector may be a precoding matrix.
  • the precoding vector may refer to the component of the precoding matrix on one transmission layer.
  • the precoding vector may refer to the component of the precoding matrix in one polarization direction.
  • the precoding vector may refer to the components of the precoding matrix in one transmission layer and one polarization direction.
  • the precoding vector may also be determined by the vector in the precoding matrix, for example, obtained by performing mathematical transformation on the vector in the precoding matrix. This application does not limit the mathematical transformation relationship between the precoding matrix and the precoding vector.
  • Antenna port short for port. It can be understood as a virtual antenna recognized by the receiving device. Or a transmit 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 one reference signal, therefore, each antenna port can be called a reference signal port . In the embodiment of the present application, the antenna port may refer to an actual independent transmitting unit (TxRU).
  • TxRU actual independent transmitting unit
  • Dual domain compression Including air domain compression and frequency domain compression.
  • Spatial domain compression may refer to selecting one or more spatial domain vectors in the spatial domain vector set as the spatial domain vectors for constructing the precoding vector.
  • Frequency domain compression may refer to selecting one or more frequency domain vectors from a set of frequency domain vectors as frequency domain vectors for constructing a precoding vector.
  • the selected airspace vector is part or all of the airspace vectors in the set of airspace vectors.
  • the selected frequency domain vector is part or all of the frequency domain vectors in the frequency domain vector set.
  • the matrix determined by one space domain vector and one frequency domain vector may be, for example, a space frequency component matrix.
  • the selected one or more space domain vectors and one or more frequency domain vectors can be used to determine one or more space frequency component matrices.
  • the weighted sum of the one or more space-frequency component matrices can be used to construct a space-frequency matrix corresponding to one transmission layer.
  • the space-frequency matrix can be approximated as the weighted sum of the space-frequency component matrix determined by the selected one or more space-domain vectors and one or more frequency-domain vectors.
  • the space domain vector and the frequency domain vector used to construct a space frequency component matrix may be called a space frequency vector pair.
  • the network device After the network device obtains the space domain vector, frequency domain vector, and weighting coefficients that can be used to construct the space frequency matrix, it can further determine the precoding vector corresponding to each frequency domain unit based on the constructed space frequency matrix.
  • the terminal device may feed back indications of L space domain vectors, indications of M frequency domain vectors, and indications of K weighting coefficients to the network device.
  • K ⁇ L ⁇ M.
  • L space domain vectors and M frequency domain vectors can be used to construct L ⁇ M space frequency vector pairs.
  • Each space-frequency vector pair in the L ⁇ M space-frequency vector pairs may include one space-domain vector in L space-domain vectors and one frequency-domain vector in M frequency-domain vectors.
  • a space frequency vector pair is uniquely determined by a space domain vector and a frequency domain vector.
  • the terminal device may feedback the weighting coefficient based on some or all of the L ⁇ M space-frequency vector pairs. Therefore, the number K of weighting coefficients fed back by the terminal device may be less than or equal to the number L ⁇ M of space-frequency vector pairs.
  • the dual-domain compression is separately compressed in the air domain and the frequency domain.
  • the terminal device feeds back, it can feed the selected one or more space domain vectors and one or more frequency domain vectors to the network device, instead of separately feeding back the subbands based on each frequency domain unit (such as subband). Weighting factors (including amplitude and phase). Therefore, the feedback overhead can be greatly reduced.
  • the frequency domain vector can represent the change law of the channel in frequency
  • the linear change of the channel in the frequency domain can be simulated by linear superposition of one or more frequency domain vectors. Therefore, high feedback accuracy can still be maintained, so that the precoding matrix recovered by the network device based on the feedback of the terminal device can still be well adapted to the channel.
  • Frequency domain vector a vector used in the embodiment of the present application to represent the change rule of the channel in the frequency domain.
  • Each frequency domain vector can represent a variation law. Since the signal is transmitted through the wireless channel, the transmitting antenna can reach the receiving antenna through multiple paths. Multipath delay causes frequency selective fading, which is the change of frequency domain channel. Therefore, different frequency domain vectors can be used to represent the change law of the channel in the frequency domain caused by the delay on different transmission paths.
  • the frequency domain vector is denoted as v.
  • the length of the frequency domain vector can be written as N f , N f ⁇ 1, and it is an integer.
  • the design of the length N f of the frequency domain vector will be described in detail in the following embodiments, and the detailed description of the length of the frequency domain vector will be omitted here.
  • Frequency domain vector set It can include frequency domain vectors of different lengths. One or more frequency domain vectors in the set of frequency domain vectors are selected to construct a precoding vector.
  • the set of frequency domain vectors may include multiple frequency domain vectors.
  • the multiple frequency domain vectors may be orthogonal to each other.
  • Each frequency domain vector in the set of frequency domain vectors can be taken from a Discrete Fourier Transform (Discrete Fourier Transform, DFT) matrix.
  • DFT Discrete Fourier Transform
  • the N f frequency domain vectors can be written as The N f frequency domain vectors can construct a matrix B f ,
  • the frequency-domain vector set can be extended oversampling factor O f O f ⁇ N f is the frequency-domain vectors.
  • the frequency-domain vector set may comprise O f subsets, each subset may include N f frequency-domain vectors.
  • the N f frequency domain vectors in each subset can be orthogonal to each other.
  • Each subset can be called an orthogonal group.
  • Each frequency domain vector in the set of frequency domain vectors can be taken from an oversampled DFT matrix.
  • the oversampling factor O f is a positive integer.
  • the N f frequency domain vectors in the o f (0 ⁇ o f ⁇ O f -1 and o f are integers) subsets of the set of frequency domain vectors can be written as Then, based on the N f frequency domain vectors in the o f th subset, a matrix can be constructed
  • each frequency domain vector in the set of frequency domain vectors can be taken from a DFT matrix or an oversampled DFT matrix.
  • Each column vector in the set of frequency domain vectors may be referred to as a DFT vector or an oversampled DFT vector.
  • the frequency domain vector may be a DFT vector or an oversampled DFT vector.
  • the frequency domain vector group may refer to a set of frequency domain vectors composed of mutually orthogonal vectors in the DFT matrix, or may refer to a subset in the oversampling DFT matrix.
  • each frequency domain vector in the frequency domain vector group is orthogonal to each other. Therefore, the frequency domain vector set may include one or more frequency domain vector groups.
  • Spatial vector spatial domain vector
  • Each element in the airspace vector may represent the weight of each antenna port. Based on the weight of each antenna port represented by each element in the space vector, linearly superimposing the signals of each antenna port can form a region with a strong signal in a certain direction in space.
  • the space vector is denoted as u.
  • the length of the space vector u can be the number of transmit antenna ports N s in one polarization direction, N s ⁇ 1 and an integer.
  • the space domain vector may be, for example, a column vector or a row vector of length N s . This application does not limit this.
  • the airspace vector please refer to the two-dimensional (2dimensions, 2D)-DFT vector or oversampling 2D-DFT vector v l,m defined in the Type II codebook of the NR protocol TS 38.214 version 15 (release 15, R15) For brevity, they are not described in detail here.
  • Airspace vector set can include a variety of airspace vectors of different lengths to correspond to different numbers of transmit antenna ports.
  • the length of the airspace vector is N s
  • the length of each airspace vector in the airspace vector set to which the airspace vector reported by the terminal device belongs is N s .
  • the set of space domain vectors may include N s space domain vectors, and the N s space domain vectors may be orthogonal to each other.
  • Each space vector in the set of space vectors can be taken from a two-dimensional (2dimension, 2D)-DFT matrix. Among them, 2D can represent two different directions, such as a horizontal direction and a vertical direction.
  • the N s space vectors can be written as
  • the N s space domain vectors can construct the matrix B s .
  • the set of space domain vectors can be expanded to O s ⁇ N s space domain vectors by an oversampling factor O s .
  • the set of space domain vectors may include O s subsets, and each subset may include N s space domain vectors.
  • the N s space vectors in each subset can be orthogonal to each other.
  • Each subset can be called an orthogonal group.
  • Each space vector in the set of space vectors can be taken from an oversampled 2D-DFT matrix.
  • the oversampling factor O s is a positive integer.
  • O s O 1 ⁇ O 2
  • O 1 may be an oversampling factor in the horizontal direction
  • O 2 may be an oversampling factor in the vertical direction.
  • O 1 ⁇ 1, O 2 ⁇ 1, O 1 and O 2 are not 1 at the same time, and are both integers.
  • the N s space domain vectors in the o s (0 ⁇ o s ⁇ O s -1 and o s are integers) subsets of the set of space domain vectors can be written as Then based on the N s space vectors in the o s subset, a matrix can be constructed
  • each space vector in the set of space vectors can be taken from a DFT matrix or an oversampled DFT matrix.
  • Each column vector in the set of space vectors may be referred to as a DFT vector.
  • the spatial domain vector may be a DFT vector.
  • the spatial domain vector group may refer to a set of spatial domain vectors composed of two mutually orthogonal vectors in the DFT matrix, or may refer to a subset in the oversampling DFT matrix.
  • each space vector in the space vector group is orthogonal to each other. Therefore, the set of airspace vectors may include one or more groups of airspace vectors.
  • Frequency domain unit a unit of frequency domain resources, which can represent different frequency domain resource granularities.
  • the frequency domain unit may include, for example but not limited to, subband, resource block (resource block (RB), subcarrier, resource block group (RBG) or precoding resource block group (PRG), etc. .
  • the precoding matrix corresponding to the frequency domain unit may refer to the precoding matrix determined based on channel measurement and feedback based on the reference signal on the frequency domain unit.
  • the precoding matrix corresponding to the frequency domain unit can be used for precoding subsequent data transmitted through the frequency domain unit.
  • the precoding matrix or precoding vector corresponding to the frequency domain unit may also be simply referred to as the precoding matrix or precoding vector of the frequency domain unit.
  • Space frequency component matrix can be determined by a space domain vector and a frequency domain vector.
  • a space-frequency component matrix can be determined by, for example, the conjugate transposition of a space-domain vector and a frequency-domain vector, such as u ⁇ v H , and its dimension can be N s ⁇ N f .
  • the space-frequency component matrix may be an expression form of a basic unit of space-frequency determined by a space-domain vector and a frequency-domain vector.
  • the space-frequency basic unit can also be represented as a space-frequency component vector, for example, which can be determined by the Kronecker product of a space-domain vector and a frequency-domain vector; the space-frequency basic unit can also be represented, for example. Space-frequency vector equivalent.
  • This application does not limit the specific manifestation of the basic unit of space frequency. Based on the same conception, those skilled in the art should consider that all possible forms determined by one space domain vector and one frequency domain vector should fall within the scope of protection of the present application.
  • the operation relationship between the space frequency component matrix and the space domain vector and frequency domain vector may also be different. This application does not limit the operation relationship between the space-frequency component matrix, the space-domain vector, and the frequency-domain vector.
  • the space-frequency matrix can be understood as an intermediate quantity for determining the precoding matrix.
  • the space frequency matrix may be determined by the precoding matrix or the channel matrix.
  • the space-frequency matrix may be obtained by weighted sum of multiple space-frequency component matrices, which is used to recover the downlink channel or the precoding matrix.
  • the space-frequency component matrix can be expressed as a matrix of dimension N s ⁇ N f
  • the space-frequency matrix can also be expressed as a matrix of dimension N s ⁇ N f
  • the space-frequency matrix whose dimension is N s ⁇ N f may include N f column vectors of length N s .
  • the N f column vectors may correspond to N f frequency domain units, and each column vector may be used to determine the corresponding precoding vector of the frequency domain unit.
  • the space-frequency matrix can be written as H, Among them, w 1 to Are N f column vectors corresponding to N f frequency domain units, and the length of each column vector may be N s .
  • the N f column vectors can be used to determine the precoding vectors of N f frequency domain units, respectively.
  • the space-frequency matrix is only one form of expression for determining the intermediate quantity of the precoding matrix, and should not constitute any limitation to this application.
  • a vector of length N s ⁇ N f can also be obtained. This vector can be called Space frequency vector.
  • the dimensions of the space-frequency matrix and space-frequency vector shown above are only examples, and should not constitute any limitation to this application.
  • the space-frequency matrix may also be a matrix of dimension N f ⁇ N s .
  • Each row vector may correspond to a frequency domain unit, which is used to determine the corresponding precoding vector of the frequency domain unit.
  • the dimension of the space-frequency matrix can be further expanded.
  • the dimension of the space-frequency matrix may be 2N s ⁇ N f or N f ⁇ 2N s . It should be understood that the number of polarization directions of the transmitting antenna is not limited in this application.
  • Channel state information reference signal can be used for downlink channel measurement and interference measurement.
  • the CSI-RS is mainly used for downlink channel measurement.
  • the network device can transmit the CSI-RS on pre-configured time-frequency resources.
  • the terminal device may receive the CSI-RS on the pre-configured time-frequency resource, so as to perform downlink channel measurement according to the received CSI-RS.
  • CSI-RS is only one possible reference signal for channel measurement, and should not constitute any limitation to this application. This application does not exclude the possibility of defining other reference signals that can be used to implement the same or similar functions in future agreements.
  • reporting bandwidth may refer to the reporting bandwidth (csi-ReportingBand) in the CSI reporting configuration (CSI-ReportConfig) via the information element (IE) with the network device. ) The bandwidth corresponding to the field.
  • the bandwidth corresponding to the csi-ReportingBand may be the reporting bandwidth.
  • the terminal device can receive the CSI-RS on the reporting bandwidth to perform channel measurement and reporting.
  • the reporting bandwidth may be the bandwidth occupied by the CSI-RS on which the terminal device performs CSI reporting once.
  • the reported bandwidth may be the bandwidth occupied by the CSI-RS resource in the frequency domain.
  • the frequency domain occupied bandwidth of the CSI-RS resource can be configured by IE-CSI frequency domain occupied bandwidth (CSI-FrequencyOccupation).
  • the network device may further indicate the number and location of subbands (that is, an example of frequency domain units) to be reported through the csi-ReportingBand field.
  • This field can be a bitmap.
  • the length of the bitmap may be the number of subbands included in the reported bandwidth. In other words, the bandwidth occupied by the first indication bit to the last indication bit in the bitmap may be the aforementioned reporting bandwidth.
  • Each indicator bit in the bitmap may correspond to a subband in the reported bandwidth.
  • Each indicator bit is used to indicate whether the corresponding subband needs to report CSI. For example, when the indication bit is set to "1", the corresponding subband needs to report CSI; when the indication bit is set to "0", the corresponding subband does not need to report CSI. It should be understood that the meanings expressed by the values of the indication bits listed here are only examples, and should not constitute any limitation to this application.
  • the signaling for configuring the reporting bandwidth and the signaling for indicating the subband to be reported are only examples, and should not constitute any limitation to this application. This application does not limit the signaling used to indicate the reporting bandwidth, the signaling used to indicate the subband to be reported, and the specific indication method.
  • N f length of frequency domain vector, N f ⁇ 1 and an integer
  • N s the length of the space vector, N s ⁇ 1 and an integer
  • M the number of frequency domain vectors reported, M ⁇ 1 and an integer
  • L the number of reported space vectors, L ⁇ 1 and an integer
  • K the number of reported weighting coefficients, K ⁇ 1 and an integer
  • R number of transmission layers, R ⁇ 1 and an integer.
  • consecutive numbering may be started from 0.
  • the R transmission layers may include the 0th transmission layer to the R-1 transmission layer;
  • the L spatial domain vectors may include the 0th spatial domain vector to the L-1 spatial domain vector, and so on, here No more examples will be given.
  • the specific implementation is not limited to this, for example, it may be consecutively numbered starting 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 space domain vector and the frequency domain vector are both column vectors as an example to illustrate the embodiment provided by this application, but this should not constitute any limitation to this application. Based on the same conception, those skilled in the art can also think of other possible expressions.
  • "for indicating” may include both for direct indication and for indirect indication.
  • the indication information may include direct indication I or indirect indication I, but does not mean that the indication information must carry I.
  • 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 achieve the indication of specific information by means of the arrangement order of various information pre-agreed (for example, 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.
  • various indication methods reference may be made to the prior art, and details are not repeated herein. It can be seen from the above 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 obtains 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.
  • the Kronecker product of two vectors can also be expressed by the product of one vector and the transposed vector of another vector.
  • 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 a 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 (downlink control information, DCI) One or a combination of at least two of them.
  • pre-defined can be achieved by pre-storing corresponding codes, tables, or other methods that can be used to indicate relevant information in devices (for example, including terminal devices and network devices), This application does not limit its specific implementation.
  • “save” may mean saving 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, and may include, for example, the LTE protocol, the NR protocol, and related protocols applied in future communication systems, which are not limited in this application.
  • At least one 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.
  • a, b and c may be 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 in the embodiments of the present application, as long as the program that records the code of the method provided in 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 vector indication method 200 for constructing 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 250. The steps of this method are explained in detail below.
  • the terminal device In step 210, the terminal device generates first indication information, where the first indication information is used to indicate one or more frequency domain vectors.
  • the one or more frequency domain vectors can be used to construct a precoding vector for one or more frequency domain units in a frequency domain unit group.
  • the one or more frequency domain vectors indicated by the first indication information may be frequency domain vectors determined by the terminal device based on the frequency domain unit group for channel measurement and reported to the network device.
  • the one or more frequency domain vectors indicated by the first indication information are the frequency domain vectors to be reported, or the selected frequency domain vectors.
  • the terminal device may first determine one or more frequency domain unit groups from the reported bandwidth. For each frequency domain unit group, the terminal device may determine the length of the frequency domain vector according to the position of the frequency domain unit to be reported in the frequency domain unit group, and then determine the frequency domain vector to be reported from the corresponding frequency domain vector set.
  • the network device may transmit the CSI-RS on the frequency domain unit included in the reported bandwidth.
  • the terminal device may feed back CSI to some or all of the frequency domain units according to the instructions of the network device.
  • the frequency domain unit indicated by the network device and requiring CSI feedback may be referred to as a frequency domain unit to be reported, or a frequency domain unit to be fed back.
  • the frequency domain unit to be reported may be a subband to be reported indicated by the network device through the csi-ReportingBand described above, or may be a frequency domain unit of other granularity corresponding to the subband to be reported.
  • corresponding to the subband to be reported may refer to that the frequency domain unit to be reported occupies the same frequency band on the frequency domain resource as the subband to be reported, but the reporting granularity may be different.
  • the frequency domain unit to be reported please refer to the relevant description in conjunction with FIG. 3 to FIG. 5 below.
  • one frequency domain unit group may include one or more frequency domain units to be reported.
  • the bandwidth occupied by a frequency domain unit group may be part or all of the reported bandwidth. In other words, a frequency domain unit group can be a subset of the reported bandwidth.
  • the terminal device For each frequency domain unit group, the terminal device can determine the frequency domain vector to be reported by the method provided in this application. Therefore, after receiving the configuration signaling for reporting the bandwidth, the terminal device may first determine the frequency domain unit group, and then determine the frequency domain vector to be reported based on each frequency domain unit group.
  • the method 200 further includes: the terminal device determining the frequency domain unit group from the reported bandwidth.
  • the terminal device may determine the frequency domain unit group from the reported bandwidth according to a predefined rule.
  • the protocol may predefine rules for determining the frequency domain unit group from the reported bandwidth.
  • the rule may be, for example, to use all frequency domain units in the reported bandwidth as a group of frequency domain units.
  • the terminal device After receiving the configuration signaling of the reported bandwidth, the terminal device, as described above in the CSI-FrequencyOccupation, can use all the reported bandwidth as the above-mentioned frequency domain unit group to determine the frequency domain vector to be reported.
  • FIG. 3 shows an example of the frequency domain unit group and the reported bandwidth. As shown in the figure, FIG. 3 shows the reporting bandwidth including 40 frequency domain units. Each shaded square in the picture Represents a frequency domain unit to be reported.
  • the bandwidth occupied by the frequency domain unit group shown in FIG. 3 is the entire bandwidth of the reported bandwidth. That is, the frequency domain unit group includes 40 frequency domain units, of which there are 29 frequency domain units to be reported.
  • the rule may also be that when the number of frequency domain units between two adjacent frequency domain units in the reporting bandwidth is greater than or equal to a predetermined threshold, the two adjacent Between frequency domain units, the reported bandwidth is divided into two parts, which belong to two frequency domain unit groups, respectively.
  • the threshold may be defined in advance, for example, as defined by a protocol.
  • the rule may also be that the ratio of the number of frequency domain units spaced between two adjacent frequency domain units in the reporting bandwidth to the number of frequency domain units in the reporting bandwidth is greater than or equal to a certain
  • the reporting bandwidth is divided into two segments from the two adjacent frequency domain units to be reported, which belong to two frequency domain unit groups, respectively.
  • the threshold may be defined in advance, for example, as defined by a protocol.
  • the terminal device may further determine whether the frequency domain units to be reported in the reported bandwidth are continuous. In the case of poor continuity, the reported bandwidth can be divided into two or more frequency domain unit groups.
  • FIG. 4 shows an example of dividing the reporting bandwidth into two frequency domain unit groups. As shown in the figure, FIG. 4 shows the reporting bandwidth including 40 frequency domain units. Each shaded square in the picture Represents a frequency domain unit to be reported.
  • the bandwidth occupied by the frequency domain unit group shown in FIG. 4 is part of the bandwidth of the reported bandwidth.
  • Fig. 4 shows two frequency domain unit groups.
  • One frequency domain unit group contains 18 frequency domain units, among which there are 12 frequency domain units to be reported; the other frequency domain unit group contains 11 frequency domain units. There are 8 frequency domain units to be reported.
  • FIG. 4 is only an example. According to the number of frequency domain units spaced between two adjacent frequency domain units to be reported, the reporting bandwidth may also be divided into more frequency domain unit groups.
  • the rule may further include that, when the number of frequency domain units spaced between two adjacent frequency domain units to be reported is greater than or equal to a predetermined threshold, from the two adjacent frequency domains to be reported Between units, the reporting bandwidth is divided into two or more sections, and the frequency domain units that do not need to be reported at the head and tail of each section are removed to form two or more frequency domain unit groups.
  • the frequency domain unit group on the left in FIG. 4 may not include the first frequency domain unit that does not need to be reported, and the frequency domain unit group on the right may not include the last frequency domain unit that does not need to be reported.
  • This application does not limit the specific rules for determining frequency domain unit groups.
  • FIG. 3 and FIG. 4 are only for the purpose of understanding the relationship between the frequency domain unit group and the reported bandwidth.
  • the granularity of the frequency domain unit in the frequency domain unit group in the figure is the same as the granularity of the reported bandwidth, but this should not constitute the application Any limitation.
  • This application does not limit the relationship between the granularity of frequency domain units in the frequency domain unit group and the granularity of frequency domain units in the reporting bandwidth.
  • the granularity of the frequency domain unit in the frequency domain unit group exemplified below in conjunction with FIG. 5 is different from the granularity of the frequency domain unit in the reporting bandwidth.
  • the protocol may be pre-defined, and the reported bandwidth is divided into multiple frequency domain unit groups on average, and each frequency domain unit group includes the same number of frequency domain units.
  • the terminal device may determine the frequency domain unit group from the reported bandwidth according to the instruction of the network device.
  • the network device may instruct the terminal device through signaling, and the currently configured reporting bandwidth may include several frequency domain unit groups and the frequency domain units included in each frequency domain unit group.
  • the frequency domain unit to be reported in the reporting bandwidth may be notified by the network device to the terminal device through signaling.
  • the method 200 further includes: Step 220, the terminal device receives second indication information, and the second indication information may be used to indicate the position and number of frequency domain units to be reported in the reporting bandwidth.
  • the network device sends the second indication information.
  • the second indication information may be csi-ReportingBand in IE-CSI-ReportConfig.
  • the network device can indicate the subband to be reported through the csi-ReportingBand.
  • the csi-ReportingBand can be a bitmap with the same length as the number of subbands included in the reporting bandwidth, so that each indicator bit in the bitmap indicates whether the corresponding subband is the subband to be reported band. Since csi-ReportingBand has been described in detail above, it will not be repeated here for brevity.
  • the number of frequency domain units to be reported described above may be equal to the number of subbands to be reported indicated by csi-ReportingBand number. If the granularity of the frequency domain unit on which the terminal device reports the first indication information is smaller than the granularity of the subband, the number of frequency domain units to be reported as described above may be greater than the number of subbands indicated by csi-ReportingBand . For example, the number of frequency domain units to be reported may be an integer multiple of the number of subbands to be reported indicated by csi-ReportingBand.
  • the number of resource blocks (RBs) contained in each subband may be an integer multiple of the number of RBs contained in each frequency domain unit. If the ratio of the granularity of the subband to the granularity of the frequency domain unit on which the first indication information is reported is recorded as ⁇ , ⁇ may be an integer greater than or equal to 1.
  • the network device indicates the subband to be reported through csi-ReportingBand, which also indicates the frequency domain unit to be reported.
  • the granularity of the frequency domain unit on which the terminal device reports the first indication information may be a subband, or may be other granularity.
  • the terminal device can determine to be reported according to the second indication information Position and number of frequency domain units.
  • the granularity of the frequency domain unit to be reported and the granularity of the frequency domain unit on which the first indication information is reported are defined as the same granularity.
  • FIG. 5 shows an example of second indication information, reporting bandwidth, and frequency domain unit group.
  • the second indication information may indicate the number and position of subbands to be reported through a bitmap.
  • the reporting bandwidth shown in the figure may include at least 10 subbands, and the ellipsis in the figure may indicate one or more subbands.
  • Each subband may correspond to an indicator bit in the bitmap.
  • the subband corresponding to the bit with the indication bit set to "1" may be the subband to be reported.
  • the frequency domain unit group may occupy part or all of the reported bandwidth.
  • the frequency domain unit group shown in the figure occupies part of the reported bandwidth.
  • the granularity of the frequency domain units in the frequency domain unit group may be smaller than the subband.
  • the granularity of the frequency domain unit shown in the figure is 1/4 of the subband granularity.
  • N 2 represents the sequence number of the subband to be reported corresponding to the last frequency domain unit in the frequency domain unit group to be reported in the reporting bandwidth
  • N 1 represents the first frequency to be reported in the frequency domain unit group
  • the sequence number M 1 of the sub-band to be reported corresponding to the domain unit in the reporting bandwidth indicates the number of frequency-domain units to be reported contained in the first sub-band to be reported
  • M 2 indicates that the last sub-band to be reported contains
  • the number of frequency domain units to be reported; N 1 ⁇ 1, N 2 ⁇ 1, M 1 ⁇ 1, M 2 ⁇ 1, and N 1 , N 2 , M 1 and M 2 are all integers.
  • M 1 and M 2 are introduced because it is considered that when the first frequency domain unit to be reported happens to be the first subband in the reported bandwidth, or the last frequency domain unit to be reported happens to be the last subband in the reported bandwidth
  • the ratio of the granularity of the first subband or the last subband of the reported bandwidth to the granularity of the frequency domain unit on which the first indication information is reported may not be ⁇ .
  • the calculation formula for determining the Q value shown above is only an example, and should not constitute any limitation to this application.
  • N 1 ' ⁇ 1, N 2 ' ⁇ 1, and N 1 'and N 2' are integers.
  • FIG. 5 is only an example for ease of understanding, and should not constitute any limitation to this application.
  • the relationship between the granularity of the frequency domain unit to be reported, the granularity of the frequency domain unit to be reported and the granularity of subbands, the relationship between the frequency domain unit group and the reported bandwidth, and the number of subbands (ie, bits) included in the reported bandwidth is not limited.
  • each subband in the bandwidth occupied by the frequency domain of the reported bandwidth shown in FIG. 5 is only an example, and should not constitute any limitation to this application.
  • each subband in the bandwidth occupied by the frequency domain of the reported bandwidth may also be numbered from 1 or from other values. Regardless of the numbering, the number of subbands contained in the bandwidth from the first subband to be reported to the last subband to be reported remains the same, or from the first subband to be reported to the last subband to be reported The number Q of frequency domain units contained in the bandwidth occupied by the band does not change.
  • the csi-ReportingBand in the IE-CSI-ReportConfig listed above is only an example of the second indication information, and should not constitute any limitation to this application.
  • This application does not exclude the possibility of indicating the number and location of frequency domain units to be reported through other existing signaling or through newly added signaling.
  • the number and location of frequency domain units to be reported are indicated by existing signaling or newly added signaling, it may be indicated based on the same or different granularity as the frequency domain unit to be reported. This application does not limit this.
  • the length N f of the frequency domain vector can be from the number of frequency domain units in the bandwidth occupied by the frequency domain unit from the first frequency domain unit to be reported to the last frequency domain unit to be reported in the frequency domain unit group determine.
  • N f Q.
  • a set of frequency domain vectors of different lengths can be predefined in the frequency domain vector set.
  • the terminal device determines the Q value, it can directly select a frequency domain vector with a length equal to the Q value from the frequency domain vector set for reporting.
  • the Q value is 38, and a frequency domain vector with a length of 38 can be selected.
  • the Q values are 17 and 10, respectively, and frequency domain vectors with lengths of 17 and 10 can be selected.
  • the Q value is 20, and a frequency domain vector with a length of 20 can be selected.
  • N f Q.
  • the terminal device determines the Q value, it can select a frequency domain vector with a length greater than the Q value from the set of frequency domain vectors.
  • frequency domain vectors with lengths ⁇ 4, 8, 12, 24, 48 ⁇ can be defined in the frequency domain vector set.
  • the terminal device may select a frequency domain vector whose length is greater than the Q value.
  • the Q value is 38, and a frequency domain vector with a length of 48 can be selected.
  • Q values are 17 and 10, respectively, and frequency domain vectors with lengths of 24 and 12 can be selected.
  • the Q value is 20, and a frequency domain vector with a length of 24 can be selected.
  • the Q values and the lengths of the frequency domain vectors listed above are only examples for easy understanding, and should not constitute any limitation to this application.
  • the Q value may be defined as The granularity of the reported frequency domain unit corresponds to the granularity of the frequency domain unit in the reporting bandwidth configured by the signaling (for example, the aforementioned subband). This application does not limit this.
  • the granularity of the frequency domain unit in reporting bandwidth is the same as the granularity of the frequency domain unit on which the first indication information is reported.
  • all are subbands.
  • this should not constitute any limitation on this application.
  • the terminal device After determining the length of the frequency domain vector, the terminal device can further determine the frequency domain vector to be reported.
  • the terminal device separately determines the frequency domain vector to be reported based on each transmission layer. That is to say, the frequency domain vectors used to determine the precoding vectors of the frequency domain units on each transmission layer may be independent of each other.
  • the terminal device may perform channel measurement based on the reference signal received on the frequency domain unit group, such as CSI-RS, to determine each transmission layer and each frequency domain in the frequency domain unit group
  • the precoding vector corresponding to the unit may refer to the prior art, and for the sake of brevity, a detailed description of the specific process is omitted here.
  • the terminal device can construct a space-frequency matrix corresponding to the transmission layer according to the precoding vectors of each frequency-domain unit on the same transmission layer, and can determine the frequency-domain vector to be reported by performing DFT of the space-frequency matrix on the space-frequency and frequency-domain.
  • H r represents a space-frequency matrix constructed by the precoding vectors corresponding to each frequency domain unit on the r-th (0 ⁇ r ⁇ R-1) transmission layer in the R transmission layers.
  • B s represents a matrix constructed by a group of space domain vectors in a predefined set of space domain vectors.
  • B f represents a matrix constructed by a group of frequency domain vectors in a set of predefined frequency domain vectors.
  • the length of each frequency domain vector in the frequency domain vector set may be determined by the method described above.
  • C represents the coefficient matrix obtained by DFT.
  • the terminal device performs space and frequency domain DFT on the space frequency matrix
  • the terminal device performs space and frequency domain DFT on the space frequency matrix
  • the terminal device performs spatial and frequency domain DFT on the spatial frequency matrix to determine the frequency domain vector and the spatial domain vector described later.
  • the specific process of the weighting coefficient is similar to that of the specific process. For details, please refer to the prior art. For brevity, a detailed description of the specific process is omitted here.
  • the terminal device may determine one or more strong columns, for example, M r , from the coefficient matrix C. M r ⁇ 1 and an integer.
  • the terminal device may determine, for example, one or more columns with a larger sum of squares of the modulus according to the magnitude of the square sum of the modulus of each column element in the coefficient matrix C.
  • the stronger the coefficient matrix C M r of columns can be used to determine a plurality of frequency domain or frequency-domain vectors in the vector set selected.
  • the numbers of the strong M r columns in the coefficient matrix C may be the numbers of the selected M r column vectors in the matrix B f constructed by the frequency domain vector set. Therefore, the frequency domain vector reported for the rth transmission layer can be determined based on the space frequency matrix corresponding to the rth transmission layer.
  • the number of frequency domain vectors to be reported may be indicated by the network device through signaling, or may be determined and reported by the terminal device by itself, or may be defined in advance, such as a protocol definition. This application does not limit this.
  • the space frequency matrix may be filled with zeros.
  • N sb the number of frequency domain units to be reported is N sb , N f >N sb ⁇ 1 and an integer.
  • the dimension of the space-frequency matrix is N t ⁇ N sb , and the matrix can be filled with zero elements of N f -N sb columns to obtain a matrix of dimension N t ⁇ N f for DFT.
  • the terminal device and the network device may be pre-agreed N f -N sb zero element column filled before N sb columns or after space-frequency matrix.
  • the terminal device may fill the N f -N sb column zero elements in the N sb column of the space frequency matrix, and after receiving the first indication information fed back by the terminal device, the network device may recover the first indication information
  • the first N sb columns of the matrix with the dimension N t ⁇ N f are extracted to obtain the space-frequency matrix with the dimension N t ⁇ N sb .
  • the method of determining the frequency domain vector to be reported by the terminal device in the case of N f >N sb listed here is only an example, and should not constitute any limitation to this application.
  • the specific method for the terminal device to determine the frequency domain vector to be reported and the specific method for the network device to restore the precoding vector are internal implementation behaviors, which are not limited in this application.
  • the terminal device may further generate indication information of the frequency domain vector to be reported.
  • the terminal device may indicate the frequency domain vector to be reported by the index of the frequency domain vector combined in the frequency domain vector set, or may indicate each frequency domain vector by the index of each frequency domain vector to be reported, or by bit
  • the figure indicates the frequency domain vector to be reported, which is not limited in this application.
  • the specific method for the terminal device to report the frequency domain vector can refer to the prior art. For example, reference can be made to the specific method for the terminal device to report the air domain vector in the feedback mode of the type II codebook.
  • the first indication information can also be used to indicate one or more airspace vectors.
  • the space domain vector and weighting coefficient reported for the rth transport layer can be determined by the coefficient matrix C obtained by the above DFT.
  • the terminal device may determine one or more strong rows from the coefficient matrix C to determine one or more space domain vectors, for example, L r , L r ⁇ 1 and an integer.
  • the sequence numbers of the strong L r rows in the coefficient matrix C may be the sequence numbers of the selected L r column vectors in the matrix U s constructed by the spatial domain vector set.
  • the number of airspace vectors to be reported may be indicated by the network device through signaling, or may be determined and reported by the terminal device by itself, or may be defined in advance, such as protocol definition. This application does not limit this.
  • the terminal device may further generate indication information of the airspace vector to be reported.
  • the terminal device may indicate the airspace vector to be reported by the index of the airspace vector combined in the airspace vector set, or may indicate each airspace vector by the index of each airspace vector to be reported, and may also indicate the to be reported by the bitmap.
  • the airspace vector of this is not limited in this application.
  • the specific method of reporting the airspace vector by the terminal device can refer to the prior art. For example, reference may be made to the specific method of reporting the airspace vector by the terminal device in the feedback method of the type II codebook.
  • the one or more space domain vectors may be determined by the terminal device based on channel measurement, or may be pre-configured.
  • the protocol may predefine that some or all of the space domain vectors in the space domain vector set are used to construct the space frequency matrix;
  • it may also be determined by the network device, for example, the network device may determine one or more airspace vectors according to the reciprocity of the uplink and downlink channels. This application does not limit the determination method of the airspace vector.
  • the first indication information can also be used to indicate one or more weighting coefficients.
  • the stronger M r columns and the stronger L r rows in the coefficient matrix C can construct a coefficient matrix C′ with dimensions L r ⁇ M r .
  • the L r ⁇ M r elements in the coefficient matrix C′ are all weighting coefficients.
  • 0 ⁇ l r ⁇ L r -1,0 ⁇ m r ⁇ M r -1, l r and m r are integers.
  • the coefficient matrix C′ may include one or more elements whose amplitude quantization value is zero. For one or more elements whose quantized value of the amplitude is zero, the terminal device may not report.
  • the number of reported weighting coefficients may be pre-configured, for example, pre-defined, such as protocol definition, or indicated by the network device through signaling. This application does not limit this.
  • reporting the number of weighting coefficients may be denoted as K r, 1 ⁇ K r ⁇ L r ⁇ M r, and K r is an integer.
  • the K r weighting coefficients may be a subset of L r ⁇ M r elements in the above coefficient matrix C′.
  • a spatial vector r L hereinabove and M r of said frequency-domain vectors constructed L r ⁇ M r null frequency component of the matrix can be used for part or all of the weighted sum, to obtain the first r Weighting coefficients corresponding to each transport layer.
  • the coefficient matrix C′ may include one or more elements with a small amplitude, for example, the quantized value of the amplitude is zero, or close to zero, the number of weighting coefficients actually reported by the terminal device may be K r , Can also be less than K r , which is not limited in this application.
  • the terminal device may further generate indication information of the weighting coefficient to be reported.
  • the terminal device may indicate the weighting coefficient in a normalized manner, for example, which is not limited in this application.
  • the specific method for the terminal device to report the weighting coefficient can refer to the prior art. For example, reference can be made to the specific method for the terminal device to report the weighting coefficient in the feedback mode of the type II codebook.
  • the terminal device determines the space domain vector, the frequency domain vector, and the corresponding weighting coefficient.
  • the specific method by which the terminal device determines the space domain vector, the frequency domain vector, and the corresponding weighting coefficient is not limited to the above.
  • the terminal device can also use existing estimation algorithms, such as multiple signal classification algorithm (multiple signal classification classification algorithm, MUSIC), Bartlett algorithm or rotation invariant subspace algorithm (estimation of signature, parameters, via rotation, variation in technology, algorithm, algorithm). , ESPRIT), etc., to determine the space domain vector, frequency domain vector and the corresponding weighting coefficient.
  • the terminal device determines one or more frequency domain vectors that can be shared based on the R transmission layers. That is, the frequency domain units used to determine the precoding vectors of the frequency domain units on each transmission layer may be common.
  • the frequency domain vectors determined for any two transmission layers may be the same. For example, M (M ⁇ 1 and an integer) frequency domain vectors.
  • the terminal device may determine one or more frequency domain vectors according to the space-frequency matrices corresponding to the R transmission layers respectively.
  • the specific method for the terminal device to determine the frequency domain vector to be reported based on the R transmission layers may be similar to that described above, or may refer to the prior art. For brevity, I will not repeat them here.
  • the first indication information can also be used to indicate one or more airspace vectors.
  • the R transmission layers may share one or more space domain vectors. For example, L (L ⁇ 1 and an integer) space vectors.
  • the terminal device may determine L space domain vectors according to the space frequency matrix corresponding to the R transmission layers.
  • the specific method for the terminal device to determine the airspace vector to be reported based on the R transmission layers may be similar to that described above, or may refer to the prior art. For brevity, I will not repeat them here.
  • the one or more space domain vectors may be determined by the terminal device based on channel measurement, or may be pre-configured.
  • the protocol may predefine that some or all of the space domain vectors in the space domain vector set are used to construct the space frequency matrix;
  • it may also be determined by the network device, for example, the network device may determine one or more airspace vectors according to the reciprocity of the uplink and downlink channels. This application does not limit the determination method of the airspace vector.
  • the first indication information can also be used to indicate one or more weighting coefficients.
  • the specific method for the terminal device to determine the weighting coefficient is similar to that described above.
  • the number of reported weighting coefficients can be configured in advance. Since this has been explained in detail above, for the sake of brevity, it will not be repeated here.
  • the terminal device determines one or more frequency domain vectors based on each space domain vector. That is, the frequency domain vectors used to construct the space frequency component matrix with different space domain vectors may be independent of each other.
  • the specific method for the terminal device to determine the strong frequency vector or vectors is similar to that described above, and for the sake of brevity, it is not repeated here.
  • the airspace vector may be determined by the terminal device based on channel measurement.
  • the first indication information is also used to indicate one or more airspace vectors.
  • the airspace vector may also be indicated by the network device, or it may be pre-defined, which is not limited in this application.
  • the first indication information can also be used to indicate one or more weighting coefficients.
  • the specific method for the terminal device to determine the weighting coefficient is similar to that described above.
  • the number of reported weighting coefficients can be configured in advance. Since this has been explained in detail above, for the sake of brevity, it will not be repeated here.
  • the terminal device can also individually determine and report the broadband amplitude coefficient for each spatial domain vector.
  • the first indication information may also be used to indicate the broadband amplitude coefficient of each spatial domain vector in one or more spatial domain vectors.
  • the specific method for the terminal device to determine the broadband amplitude coefficient for each spatial domain vector can refer to the prior art, and for the sake of brevity, it will not be repeated here.
  • the application does not limit the correspondence between the frequency domain vector and the space domain vector, the correspondence relationship between the frequency domain vector and the transmission layer, and the specific determination method of the frequency domain vector.
  • This application does not limit the specific method for the terminal device to report the space domain vector, frequency domain vector, and weighting coefficient.
  • This application does not limit the number of spatial domain vectors, frequency domain vectors, and weighting coefficients reported by the terminal device.
  • the terminal device may determine and generate first indication information to be reported.
  • the distribution of frequency domain units to be reported in the reporting bandwidth is not continuous.
  • the frequency domain units to be reported are sparsely distributed in the reporting bandwidth.
  • the frequency domain unit to be reported may not have good frequency domain continuity. If the dual domain compression method described above is still used to feed back the precoding vector, it may not be able to communicate well with Downstream channel adaptation.
  • the terminal device may further determine whether to use the dual-domain compression method to feed back the precoding vector.
  • step 210 specifically includes the terminal device determining the first indication information when the frequency domain unit to be reported in the frequency domain unit group meets the preset condition.
  • the terminal device uses a dual-domain compression method to feed back the precoding vector, and then determines the first indication information.
  • the preset condition may be: the number of frequency domain units to be reported in the frequency domain unit group is greater than or equal to x ⁇ Q, x is a predefined value, and 0 ⁇ x ⁇ 1.
  • the ratio of the number of frequency domain units to be reported in the frequency domain unit group to Q is greater than or equal to x.
  • x 0.5.
  • the Q frequency domain units are composed of all frequency domain units in the first frequency domain unit to be reported in the frequency domain unit group to the last frequency domain unit to be reported, and may occupy part or all of the frequency domain unit group bandwidth.
  • the frequency domain unit to be reported occupies a large proportion in the Q frequency domain units, it may be considered that the distribution of the frequency domain unit to be reported is continuous, and the first indication information may be determined based on the method described above .
  • the terminal device may determine the first indication information based on the method described above.
  • the preset condition may be: the number of frequency domain units to be reported in the frequency domain unit group is greater than or equal to a predefined first threshold.
  • the first indication information may be determined based on the method described above.
  • the preset condition may be: the number of frequency domain units to be reported in the frequency domain unit group is greater than or equal to a predefined second threshold, and the Q value is greater than or equal to a predefined third threshold.
  • the first indication information may be determined based on the method described above.
  • the second threshold and the third threshold may be independent of each other, and the size relationship between the second threshold and the third threshold is not limited in this application.
  • the preset condition may be: the number of frequency domain units to be reported in the frequency domain unit group is greater than or equal to a predefined fourth threshold, and the number of frequency domain units to be reported in the frequency domain unit group is greater than or equal to y ⁇ Q, 0 ⁇ y ⁇ 1, y is a predefined value.
  • the first indication information may be determined based on the method described above.
  • the preset condition may be that the number of frequency domain units that do not need to be reported in the frequency domain unit group is less than or equal to a predefined fifth threshold, and the Q value is greater than or equal to a predefined sixth threshold.
  • the first indication information may be determined based on the method described above.
  • the preset condition may be: the number of frequency domain units that do not need to be reported in the frequency domain unit group is less than or equal to a predefined seventh threshold, and the number of frequency domain units that do not need to be reported are less than or equal to z ⁇ Q, 0 ⁇ z ⁇ 1, z and the sixth threshold are predefined values.
  • the first indication information may be determined based on the method described above.
  • the preset condition may be that the number of frequency domain units in the frequency domain unit group that does not need to be reported is less than or equal to the eighth threshold.
  • the frequency to be reported can be considered
  • the distribution of the domain units in the frequency domain unit group is relatively continuous, and the first indication information may be determined based on the method described above.
  • predefined values such as the first threshold to the seventh threshold and x, y, z, and so on.
  • the predefined values may be independent of each other, and the specific value of each predetermined value is not limited in this application.
  • the terminal device may determine the feedback method based on the preset condition, and the network device may also be based on the same preset condition.
  • the precoding vector is restored according to the received feedback.
  • 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 a physical uplink control channel (PUCCH), 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, and for the sake of brevity, a detailed description of its specific process is omitted here.
  • step 240 the network device determines one or more frequency domain vectors according to the first indication information.
  • the network device may determine one or more frequency domain vectors fed back by the terminal device according to the first indication information.
  • the method for the network device to determine one or more frequency domain vectors according to the first indication information corresponds to the method for the terminal device to determine the frequency domain vectors.
  • the network device may separately determine one or more frequency domain vectors corresponding to each transmission layer. If the terminal device reports one or more frequency domain vectors based on the R transmission layers, the terminal device may determine one or more frequency domain vectors that can be shared by the R transmission layers. If the terminal device reports one or more frequency domain vectors based on each space domain vector, the network device may separately determine one or more frequency domain vectors corresponding to each space domain vector.
  • the method for the terminal device to determine one or more frequency domain vectors according to the first indication information corresponds to the method for the indication information for the frequency domain vectors of the terminal device.
  • the network device may determine one or more frequency domain vectors indicated by the terminal device from the frequency domain vector set according to the index. If the terminal device uses the index of each frequency domain vector to indicate the selected frequency domain vector, the network device may determine one or more frequency domain vectors indicated by the terminal device from the set of frequency domain vectors according to each index. If the terminal device uses a bitmap to indicate the frequency domain vector, the network device may determine one or more frequency domain vectors indicated by the terminal device according to the correspondence between the bitmap and each frequency domain vector in the frequency domain vector set.
  • the first indication information can also be used to indicate one or more space domain vectors and one or more weighting coefficients.
  • the network device may determine one or more airspace vectors and one or more weighting coefficients according to the first indication information.
  • the method for the network device to determine the airspace vector according to the first indication information corresponds to the method for the terminal device to generate the indication information for the airspace vector.
  • the method by which the network device determines the weighting coefficient according to the first indication information corresponds to the method by which the terminal device generates the indication information of the weighting coefficient. Since the network device determines the space vector and the weighting coefficient according to the first indication information, reference may be made to the prior art. For brevity, the detailed description of the specific process is omitted here.
  • step 240 specifically includes: the network device determining one or more frequency domain vectors according to the first indication information when the frequency domain unit to be reported in the frequency domain unit group meets a preset condition.
  • the network device determines whether the frequency domain unit to be reported in the frequency domain unit group meets the preset condition is similar to the specific process of determining whether the frequency domain unit to be reported in the frequency domain unit group meets the preset condition in step 210 above, For brevity, I will not repeat them here.
  • the preset condition may be pre-agreed by the terminal device and the network device, or pre-defined by the protocol.
  • the network device and the terminal device may determine whether the frequency domain unit to be reported meets the preset condition based on the same preset condition.
  • the method further includes step 250, the network device determines the precoding vectors of one or more frequency domain units in the frequency domain unit group.
  • the network device may determine the precoding vector of one or more frequency domain units in the frequency domain unit group according to the predetermined frequency domain vector, space domain vector and weighting coefficient, for example, as determined in step 240 above.
  • the network device may determine L r space domain vectors, M r frequency domain vectors, and L r ⁇ M r weighting coefficients according to the first indication information. Then, the network device may determine the precoding vector on the rth transmission layer and the jth frequency domain unit in the frequency domain unit group based on the following formula:
  • u l, r represents based on L r a spatial vector r th transport layer feedback in the l th spatial vector
  • v m, r denotes based on the r th transport layer feedback
  • M r frequency-domain vectors m frequency domain vectors
  • v m,r (j) represents the jth element in v m,r
  • a l,m,r represents the weighting coefficients corresponding to the lth space domain vector u l,r and the mth frequency domain vector v m,r based on the r th transmission layer feedback
  • a l,m,r,1 Represents the weighting coefficients corresponding to the lth space domain vector u l and the mth frequency domain vector v m in the first polarization direction based on feedback from the rth transmission layer
  • each weighting coefficient may include an amplitude coefficient and a phase coefficient.
  • E.g, p l,m,r represents the amplitude coefficient, Represents the phase coefficient.
  • the relationship between a l,m,r,1 and a l,m,r,2 and amplitude coefficient and phase coefficient respectively is similar. For brevity, I will not list them one by one here.
  • the number of weighting coefficients fed back by the terminal device based on the rth transmission layer may not necessarily be the sum of L r ⁇ M r , that is, it may not necessarily be combined with the above L r space vectors
  • the L r ⁇ M r space frequency component matrices constructed by the M r frequency domain vectors correspond. However, it may only correspond to a part of the space-frequency component matrixes among the L r ⁇ M r space-frequency component matrixes.
  • the above formula can be further simplified, or the partial unreported weighting coefficient in the above formula can be treated as a weighting coefficient with zero amplitude. Since the method for the network device to restore the precoding vector is an internal implementation behavior of the device, the present application does not limit the specific method for the network device to restore the precoding vector.
  • R transmission layers share one or more space domain vectors and one or more frequency domain vectors, such as L space domain vectors and M frequency domain vectors, the above is used to determine the rth transmission layer and the frequency domain unit group
  • the formula of the precoding vector of the jth frequency domain unit in can be simplified to:
  • u l represents the lth space domain vector among the L space domain vectors
  • v m represents the mth frequency domain vector among the M frequency domain vectors
  • v m (j) represents the jth element in v m
  • the terminal device feeds back one or more frequency domain vectors based on each space domain vector, the above formula for determining the precoding vectors on the rth transmission layer and the jth frequency domain unit in the frequency domain unit group can be deformed for:
  • u l,r represents the lth space domain vector among the L r space domain vectors fed back based on the rth transport layer
  • R represents transmission based on the feedback layer, the first polarization direction and the l-th spatial vectors l and m frequency domain vectors corresponding weighting coefficient
  • R represents transmission based on the feedback layer, the second polarization direction and the l-th spatial vectors l and m frequency domain vectors corresponding weighting coefficient.
  • the terminal equipment separately reports the broadband amplitude coefficient of the space domain vector and the weighting coefficient of the space frequency component matrix, the above is used to determine the precoding vector on the rth transmission layer and the jth frequency domain unit in the frequency domain unit group
  • the formula can also be transformed into:
  • Vector corresponding represents the phase coefficient corresponding to the lth space domain vector and the mth frequency domain vector based on the rth transmission layer feedback;
  • p l,m,r,1 represents the first pole based on the rth transmission layer feedback Amplitude coefficients corresponding to the lth space domain vector and the mth frequency domain vector in the normalization direction;
  • the network device may also construct a space-frequency matrix based on the space-domain vector, frequency-domain vector, and weighting coefficients, such as Furthermore, the precoding vector of each frequency domain unit is determined.
  • the calculation formula of the space frequency matrix shown here only shows the case where R transmission layers share L space domain vectors and M frequency domain vectors, and the above various possible situations can be modified on this basis. For the sake of brevity, I will not list them here.
  • the terminal device determines the length of the frequency domain vector based on the number of frequency domain units included in the bandwidth occupied by the frequency domain unit from the first frequency domain unit to the last frequency domain unit in the frequency domain unit group,
  • the selected frequency domain vector can maintain the continuity of the frequency domain, and can more accurately reflect the changing law of the channel in the frequency domain. Therefore, a higher feedback accuracy can be ensured, so that the precoding vector recovered by the network device based on the feedback of the terminal device can be better adapted to the channel, which is beneficial to improve the subsequent data transmission performance.
  • the selected frequency domain vector does not really simulate the changing law of channels on consecutive frequency domain units, so It cannot accurately reflect the changing law of the channel in the frequency domain, and the feedback accuracy is affected.
  • one or more frequency domain vectors are used to describe the different changes of the channel in the frequency domain, and the linear superposition of the one or more frequency domain vectors is used to simulate the changes of the channel in the frequency domain, and the frequency domain is fully tapped.
  • the relationship between the units utilizes the continuity of the frequency domain, and uses fewer frequency domain vectors to describe the changing law of the channel on multiple frequency domain units.
  • the method for determining the length of the frequency domain vector is not limited to one transmission layer or one polarization direction.
  • the length of the frequency domain vector determined by the terminal device for a group of frequency domain units may be applicable to one or more transmission layers and one or more polarization directions.
  • the terminal device can determine the length of the frequency domain vector only once, and then perform dual domain compression to determine the frequency domain vector to be reported. This application does not limit the number of transmission layers and the number of polarization directions.
  • the feedback method for dual-domain compression can coexist with other feedback methods, and the terminal device can determine which method to use to feed back the precoding vector to the network device based on the number and location of frequency domain units to be reported.
  • FIG. 6 is a schematic flowchart of a method 600 for reporting PMI provided by another embodiment of the present application from the perspective of device interaction. As shown, the method 600 may include steps 610 to 630. The steps of method 600 are described in detail below.
  • step 610 the terminal device generates PMI.
  • the frequency domain unit group has been described in detail in the method 200 above, and for the sake of brevity, no further description will be given here.
  • the PMI in the case where the frequency domain unit to be reported in the frequency domain unit group satisfies the preset condition, the PMI includes an indication of one or more frequency domain vectors.
  • the one or more frequency domain vectors are partial frequency domain vectors in the frequency domain vector group.
  • each frequency domain vector in each frequency domain vector group is orthogonal to each other. That is to say, the one or more frequency domain vectors may be one or more frequency domain vectors selected from the frequency domain vector group by frequency domain compression.
  • the PMI does not include the indication of the frequency domain vector, or only includes the indication of the frequency domain vector group.
  • the terminal device may still use the PMI feedback method of the type II codebook to report the space domain vector, broadband amplitude coefficient, and subband superposition coefficient, in this case Next, the indication of the frequency domain vector is not included in the PMI.
  • the terminal device may directly feed back a frequency domain vector group to the network device without using the type II codebook feedback method, so that the network device can Each frequency domain vector in the frequency domain vector group, as well as the space domain vector and weighting coefficients, restore the precoding vector.
  • the PMI may include only the indication of the frequency domain vector group.
  • the terminal device may not feed back the indication of the frequency domain vector group, and the terminal device and the network device may agree in advance to use the frequency domain vector of the first frequency domain vector group in the frequency domain vector set for recovering the precoding vector.
  • the PMI does not include the indication of the frequency domain vector or frequency domain vector group.
  • the terminal device may directly determine the space domain vector and the weighting coefficient based on all frequency domain vectors in the frequency domain vector group, and further based on the dual domain compression. For example, the spatial domain frequency and DFT of the spatial frequency matrix are used to determine the spatial domain vector and the weighting coefficient.
  • the dual-domain compression method of constructing the precoding vectors using part of the frequency domain vectors in the frequency domain vector group is called the first compression method; the entire frequency domain vector group will be used to construct the pre-coding vector
  • the dual-domain compression method of the encoding vector is called the second compression method.
  • the method of feeding back the PMI based on the first compression method is referred to as the PMI feedback method based on the first compression method
  • the method of feeding back the PMI based on the second compression method is referred to as the PMI feedback method based on the second compression method. It can be understood that both the first compression method and the second compression method belong to the dual-domain compression method.
  • the PMI described above includes the indication of the frequency domain vector, but does not mean that the PMI includes only the indication of the frequency domain vector.
  • the PMI may also include the indication of the space domain vector and the indication of the weighting coefficient. The indication of whether the frequency domain vector is included in the PMI described here is just to distinguish the first compression method from the second compression method.
  • the terminal device and the network device may pre-appoint preset conditions.
  • the PMI feedback based on the first compression method is adopted; when the frequency domain unit in the frequency domain unit group does not satisfy the preset condition, it is adopted
  • the PMI feedback method based on the second compression method, or the PMI feedback method using type II codebook is adopted.
  • whether the PMI feedback mode based on the second compression mode or the PMI feedback mode of the type II codebook can be pre-determined by the network device and the terminal device
  • the agreement, or, the agreement is predefined.
  • the network device and the terminal device may perform corresponding steps based on the same feedback method.
  • the preset condition is: the number of frequency domain units to be reported in the frequency domain unit group is greater than or equal to a predefined first threshold.
  • the preset condition is that: the number of frequency domain units to be reported in the frequency domain unit group is greater than or equal to a predefined second threshold, and the Q value is greater than or equal to a predefined third threshold.
  • the preset condition is: the number of frequency domain units to be reported in the frequency domain unit group is greater than or equal to a predefined fourth threshold, and the number of frequency domain units to be reported in the frequency domain unit group is greater than or equal to y ⁇ Q, 0 ⁇ y ⁇ 1, y is a predefined value.
  • the preset condition is that the number of frequency domain units in the frequency domain unit group that does not need to be reported is less than or equal to a predefined fifth threshold, and the Q value is greater than or equal to a predefined sixth threshold.
  • the preset condition is: the number of frequency domain units that do not need to be reported in the frequency domain unit group is less than or equal to a predefined seventh threshold, and the number of frequency domain units that do not need to be reported are less than or equal to z ⁇ Q, 0 ⁇ z ⁇ 1, z is a predefined value.
  • the preset condition is: the number of frequency domain units in the frequency domain unit group that does not need to be reported is less than or equal to a predefined eighth threshold.
  • the length N f of the frequency domain vector can be, for example, from the frequency domain unit group listed above from the first frequency domain unit to be reported to the last frequency to be reported.
  • the number Q of frequency domain units contained in the bandwidth occupied by the domain unit is determined. Since the relationship between N f and Q has been described in detail in the above method 200, for the sake of brevity, no further description will be given here.
  • the length N f of the frequency domain vector is not limited to be determined by the above Q value, for example, the length of the frequency domain vector can also be determined by the number of frequency domain units included in the reported bandwidth, or, by the frequency domain unit group The number of frequency domain units to be reported is determined. This application does not limit this.
  • the length N f of the frequency domain vector may also be the same as the length of the frequency domain vector determined in the first compression mode.
  • the length of the frequency domain vector may be determined by the number Q of frequency domain units contained in the bandwidth occupied by the frequency domain unit from the first frequency domain unit to the last frequency domain unit in the frequency domain unit group.
  • the length of the frequency domain vector may also be determined by the number of frequency domain units to be reported in the frequency domain unit group, or the length of the frequency domain vector may also be determined by the number of frequency domain units included in the reported bandwidth. This application does not limit this.
  • the terminal device can determine the length of the frequency domain vector based on a predefined method.
  • the network device may also determine the frequency domain vector used to recover the precoding vector based on the same method and the feedback of the terminal device.
  • step 620 the terminal device sends PMI. Accordingly, the network device receives the PMI.
  • the terminal device may send the PMI to the network device through physical uplink resources, such as PUSCH or PUCCH, so that the terminal device determines the precoding matrix according to the PMI.
  • physical uplink resources such as PUSCH or PUCCH
  • the specific method for the terminal device to send the PMI 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 630 the network device determines the precoding matrix corresponding to each frequency domain unit according to the PMI and whether the frequency domain unit to be reported in the frequency domain unit group meets the preset condition.
  • the network device may determine which feedback method the terminal device uses to feed back the PMI based on the preset conditions described above, and then parse the information in the PMI according to the feedback method.
  • the network device determines that the frequency domain unit to be reported in the frequency domain unit group meets the preset condition, it may be determined that the terminal device determines the frequency domain vector based on the first compression mode, that is, the PMI feedback mode based on frequency domain compression is used.
  • the network device may restore the precoding vectors of one or more frequency domain units on each transmission layer based on the method listed in step 250 in the above method 200, and then determine the precoding matrix of each frequency domain unit.
  • the network device determines that the frequency domain unit to be reported in the frequency domain unit group does not satisfy the preset condition, it may be determined that the terminal device adopts a type II codebook PMI feedback method, or a frequency domain transform-based PMI feedback method.
  • the network device can determine the precoding matrix of each frequency domain unit based on the existing technology. For specific implementation, refer to the feedback mode defined in the type II port selection codebook defined in the NR protocol TS38.214 version 15 (release 15, R15). For brevity, I will not repeat them here.
  • the network device may determine the precoding matrix of each frequency domain unit based on the two-domain compression method according to the predefined frequency domain vector group or the frequency domain vector group fed back by the terminal device.
  • the specific implementation manner has been described in detail in step 250 of the above method 200, and for the sake of brevity, no more details will be given here.
  • embodiments of the present application introduce multiple feedback modes, and select an appropriate feedback mode to report PMI according to the number and position of frequency domain units to be reported. Fully considered the number of frequency domain units to be reported and the continuity of distribution. By introducing multiple feedback modes to adapt to different situations, you can take into account both feedback accuracy and feedback overhead, so as to achieve a balance between the two.
  • the size of the sequence number of each process does not mean the order of execution, and the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application .
  • 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 or the method 600 according to an embodiment of the present application, and the communication device 1000 may include a terminal for performing the method 200 in FIG. 2 or the method 600 in FIG. 6 A unit of method performed by a device.
  • each unit in the communication device 1000 and the other operations and/or functions described above are to implement the corresponding processes of the method 200 in FIG. 2 or the method 600 in FIG. 6, respectively.
  • the communication unit 1100 can be used to perform steps 220 and 230 in the method 200
  • the processing unit 1200 can be used to perform step 210 in the method 200. It should be understood that the specific process for each unit to execute the above corresponding steps has been described in detail in the above method embodiments, and for the sake of brevity, no further description is provided here.
  • the communication unit 1100 may be used to perform step 620 in the method 600 and the processing unit 1200 may be used to perform step 610 in the method 600. It should be understood that the specific process for each unit to execute the above corresponding steps has been described in detail in the above method embodiments, and for the sake of brevity, no further description is provided here.
  • the communication unit 1100 in the communication device 1000 may correspond to the transceiver 2020 in the terminal device 2000 shown in FIG. 8, 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. 8.
  • 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 method 200 or the method 600 according to an embodiment of the present application.
  • the communication device 1000 may include the method 200 in FIG. 2 or the method 600 in FIG. 6.
  • each unit in the communication device 1000 and the other operations and/or functions described above are to implement the corresponding processes of the method 200 in FIG. 2 or the method 600 in FIG. 6, respectively.
  • the communication unit 1100 can be used to perform steps 220 and 230 in the method 200
  • the processing unit 1200 can be used to perform steps 240 and 250 in the method 200. It should be understood that the specific process for each unit to execute the above corresponding steps has been described in detail in the above method embodiments, and for the sake of brevity, no further description is provided here.
  • the communication unit 1100 may be used to perform step 620 in the method 600 and the processing unit 1200 may be used to perform step 630 in the method 600. It should be understood that the specific process for each unit to execute the above corresponding steps has been described in detail in the above method embodiments, and for the sake of brevity, no further description is provided here.
  • the communication unit in the communication device 1000 may correspond to the transceiver 3200 in the network device 3000 shown in FIG. 9, and the processing unit 1200 in the communication device 1000 may It corresponds to the processor 3100 in the network device 3000 shown in FIG. 9.
  • the communication unit 1100 in the communication device 1000 may be an input/output interface.
  • FIG. 8 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 channel 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 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. 7.
  • the above-mentioned transceiver 2020 may correspond to the communication unit in FIG. 7, and may also be referred to as 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. 8 can implement various processes involving the terminal device in the method embodiment shown in FIG. 2 or FIG. 6.
  • 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.
  • the audio circuit It may also include a speaker 2082, a microphone 2084, and so on.
  • FIG. 9 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.
  • RRU 3100 may be called a transceiver unit, corresponding to the communication unit 1200 in FIG. 7.
  • 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 3200 part of the BBU 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, which may correspond to the processing unit 1100 in FIG. 7 and is mainly used to complete baseband processing functions, such as channel coding, multiplexing, modulation, spread spectrum, and so on.
  • 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 indication 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 the 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. 9 can implement various processes involving the network device in the method embodiment of FIG. 2 or FIG. 6.
  • 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 implemented internally 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 execute the vector indication method for constructing a precoding vector in any of the foregoing method embodiments.
  • the above processing device may be one or more chips.
  • the processing device may be a field programmable gate array (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.
  • the steps of the foregoing method embodiments may be completed by instructions in the form of hardware integrated logic circuits or software in the processor.
  • 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 may be read-only memory (read-only memory, ROM), programmable read-only memory (programmable ROM, PROM), erasable programmable read-only memory (erasable PROM, EPROM), electronically Erasable programmable read-only memory (electrically EPROM, EEPROM) or flash memory.
  • Volatile memory can be random access memory (random access memory, RAM), which acts 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 perform the operations shown in FIGS. 2 and 6 The method of any one of the embodiments is shown.
  • the present application also provides a computer-readable medium, the computer-readable medium stores program code, and when the program code is run on the computer, the computer is caused to execute the operations shown in FIGS. 2 and 6. The method of any one of the embodiments is shown.
  • 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. When the computer instructions are loaded and executed on the computer, all or part of the processes or functions described in the embodiments of the present application are generated.
  • the computer may be a general-purpose computer, a dedicated 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 one or more available medium integrated servers, data centers, and the like.
  • 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 disc, 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 disc
  • 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 a local system, a distributed system, and/or a 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 a local system, a distributed system, and/or a 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 unit is only a logical function division, and there may be other divisions in actual implementation, 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 may be 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 the computer, the processes or functions according to the embodiments of the present application are generated in whole or in part.
  • the computer may be a general-purpose computer, a dedicated 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 one or more available medium integrated servers, data centers, and the like.
  • 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 can 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
  • 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, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application.
  • the foregoing 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 de vecteur pour la construction d'un vecteur de précodage, et un appareil de communication. Le procédé comprend les étapes suivantes : un dispositif terminal génère et envoie des premières informations d'indication, les premières informations d'indication étant utilisées pour indiquer un ou plusieurs vecteurs de domaine de fréquence, lesdits vecteurs de domaine de fréquence étant utilisés pour construire un ou plusieurs vecteurs de précodage correspondant à une ou plusieurs unités de domaine de fréquence dans un groupe d'unités de domaine de fréquence, et la longueur desdits vecteurs de domaine de fréquence est déterminée par le nombre d'unités de domaine de fréquence comprises dans une largeur de bande occupée de la première unité de domaine de fréquence devant être signalée à la dernière unité de domaine de fréquence devant être signalée dans le groupe d'unités de domaine de fréquence. Le groupe d'unités de domaine de fréquence comprend une ou plusieurs unités de domaine de fréquence, et la largeur de bande occupée par le groupe d'unités de domaine de fréquence est une partie ou la totalité d'une largeur de bande signalée. La longueur desdits vecteurs de domaine de fréquence est déterminée sur la base du procédé, de sorte que le vecteur de domaine de fréquence sélectionné peut maintenir la continuité d'un domaine de fréquence et reflète avec précision la loi de changement d'un canal dans le domaine de fréquence, ce qui contribue à obtenir une précision de rétroaction élevée.
PCT/CN2020/070495 2019-01-11 2020-01-06 Procédé d'indication de vecteur pour la construction d'un vecteur de précodage, et appareil de communication WO2020143580A1 (fr)

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