WO2020211681A1 - Procédé de mesure de canal et appareil de communication - Google Patents

Procédé de mesure de canal et appareil de communication Download PDF

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Publication number
WO2020211681A1
WO2020211681A1 PCT/CN2020/083497 CN2020083497W WO2020211681A1 WO 2020211681 A1 WO2020211681 A1 WO 2020211681A1 CN 2020083497 W CN2020083497 W CN 2020083497W WO 2020211681 A1 WO2020211681 A1 WO 2020211681A1
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WIPO (PCT)
Prior art keywords
precoding
vectors
vector
feedback information
reference signal
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PCT/CN2020/083497
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English (en)
Chinese (zh)
Inventor
陈大庚
黄宗浩
庞继勇
毕晓艳
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华为技术有限公司
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Publication of WO2020211681A1 publication Critical patent/WO2020211681A1/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
    • H04B7/06—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

Definitions

  • This application relates to the field of communication, and more specifically, to a channel measurement method and communication device.
  • Massive MIMO massive multiple-input multiple output
  • network equipment can reduce interference between multiple users and interference between multiple signal streams of the same user through precoding technology. Thereby improving signal quality, realizing space division multiplexing, and improving spectrum utilization.
  • the terminal device can perform channel measurement according to the received reference signal to determine the precoding vector to be fed back.
  • the reference signal received by the terminal device may be, for example, a pre-coded reference signal.
  • the precoding vector used by the network device to precode the downlink reference signal is not appropriate, the feedback obtained from the terminal device will not be accurate enough, and the precoding matrix determined to precode the downlink data will also It may not be able to adapt to the downlink channel well, and the data transmission performance will decrease.
  • the present application provides a channel measurement method and communication device, in order to select a reasonable precoding vector to precode the downlink reference signal, thereby facilitating obtaining more accurate feedback from the terminal equipment.
  • a channel measurement method is provided. This method can be executed by a network device, or can also be executed by a chip configured in the network device. This application does not limit this.
  • the method includes: determining a target precoding vector for data transmission based on feedback information received for K times; determining the feedback information received for K times based on precoding reference signals sent for K times, where the kth times received feedback information indicating the k N precoding vectors heavy weight, a pre-coding vector N k + 1 precoding vectors in said N weighting k precoding vectors and is; the k-th N
  • the precoding vector is the precoding vector used to generate the precoding reference signal for the kth transmission
  • the N k+1 precoding vectors are the precoding vectors used for generating the precoding reference signal for the k+1 transmission.
  • K ⁇ 1, 1 ⁇ k ⁇ K, and k, K, N k, and N k+1 are all positive integers
  • the data to be transmitted is precoded according to the target precoding vector to obtain precoded data ; Send the precoded data.
  • the terminal device can perform channel measurement and feedback based on the precoding reference signal sent multiple times by the network device.
  • the precoding reference signal used by the precoding reference signal sent by the network device each time refers to the information fed back by the terminal device in the previous time, so it can get closer and closer to the direction of the terminal device, so that the feedback of the terminal device obtained is more Precise.
  • the network device can determine the precoding vector used to precode the data based on the latest feedback of the terminal device, and the determined precoding vector can be considered as the one closest to the direction of the terminal device in the currently obtained channel measurement results. The precoding direction is therefore helpful to improve data transmission performance.
  • the N k + 1 precoding vectors of the remaining N k + 1 -1 precoding vector set of precoding vectors is determined in advance in Precoding vector.
  • the network device can select N k+1 -1 precoding vectors that have not been used for precoding the reference signal in the previous channel measurement or multiple channel measurements from the predetermined precoding vector set. Coding vector, the N k+1 -1 precoding vector and the weighted sum of the above N k precoding vectors are used together to precode the reference signal sent for the k+1th time to obtain the N k+1 The weight of each precoding vector, and the feedback information obtained therefrom can be used to precode the reference signal sent for the k+2th time. By traversing in the precoding vector set, different precoding vectors can be used to search the direction of the terminal device. Through multiple iterations, the vector used by the network device to precode the reference signal can get closer and closer to the direction of the terminal device, and the precoding vector determined thereby for data transmission is also getting closer and closer to the direction of the terminal device.
  • the method further includes: generating a first set of precoding vectors based on the feedback information received for the first time among the feedback information received for the K times, The feedback information received for the first time is used to indicate the weights of N I precoding vectors, and the N I precoding vectors are precoding vectors used to generate the precoding reference signal transmitted for the first time;
  • the first set of precoding vectors includes a weighted sum determined by the N I precoding vectors and their weights And based on Multiple vectors constructed; 1 ⁇ I ⁇ K and I is a positive integer.
  • the network device can also compare the currently used pre-coding vector set based on the feedback information of the terminal device.
  • the second set of precoding vectors is updated. Since this update is based on the feedback information of the terminal device, the updated first precoding vector set is closer to the direction of the terminal device than the currently used precoding vector set, so it can be in a smaller range Search for the direction of the terminal device within to obtain more accurate feedback.
  • the precoding vector used to generate the precoding reference signal for the I+1th transmission is the precoding vector in the first precoding vector set; At least part of the precoding vectors in the precoding vector used to generate the precoding reference signal sent the previous time are vectors in a predetermined second precoding vector set; the second precoding vector set is the same as the first precoding vector set.
  • the set of precoding vectors is different.
  • the second precoding vector set may be a pre-configured precoding vector set, or may be a precoding vector set obtained after one or more updates. This application does not limit this. Since the second precoding vector is updated, the updated precoding vector in the first precoding vector set is at least partially different from the precoding vector in the second precoding vector set.
  • the first precoding vector set includes at least T precoding vectors.
  • the generating a first precoding vector set based on the feedback information received for the first time among the feedback information received K times includes: the feedback information received for the first time among the feedback information received for the K times Determine the weighted sum of the N I precoding vectors Is a precoding vector in the first precoding vector set; based on In the row where the element b with the largest amplitude is located, generate T-1 Givens Givens rotation matrix G(c, t, ⁇ ) or G(t, c, ⁇ ); where c means b is in The row index in and c is a positive integer, 1 ⁇ c ⁇ T; t takes an integer value from 1 to T and t ⁇ c, ⁇ represents the angle of rotation; based on the T-1 Givens rotation matrix G(c, t , ⁇ ) or G(t, c, ⁇ ) to generate the remaining T-1 vectors in the first precoding
  • the two-bit vector formed by the element with the largest amplitude and other elements is slightly rotated, which is equivalent to extending multiple directions based on the direction with the strongest intensity. That is, based on a more accurate search for the direction of the terminal device in a small range.
  • the feedback information received K times is used to determine the precoding vector used to transmit the data through the first transmission layer among the L transmission layers ;
  • One or more of the L transmission layers are used to transmit the data, 1 ⁇ l ⁇ L, L ⁇ 1, and both l and L are integers.
  • the L transport layers can be used to transmit data to the same terminal device.
  • the feedback information received K times above can be used to determine a precoding vector for precoding data transmitted through one of the transport layers.
  • the L transmission layers can be determined by the number of transmitting antennas configured by the network device.
  • the number of transmitting antennas mentioned here may refer to the number of independent transmitting and receiving units (transceiver units, TxRU).
  • J of the L transport layers are used to transmit data
  • the J transport layers include the lth transport layer and the For J-1 transport layers other than the lth transport layer, 2 ⁇ J ⁇ L, and J is an integer.
  • the method further includes: determining a precoding vector used for transmitting data in the mth transmission layer based on the feedback information received K times, where the jth transmission layer is one of the J-1 transmission layers Any transport layer; wherein the feedback information received K times is determined by K times through the precoding reference signal sent on the j-th transmission layer; among the feedback information received K times, the k-th reception The feedback received is used to indicate The weight of each precoding vector, the The weighted sum of the precoding vectors is One of the precoding vectors; the A precoding vector is a precoding vector used to generate a precoding reference signal sent through the jth transmission layer for the kth time, and the The precoding vectors are the precoding vectors used to generate the precoding reference signal sent through the jth transmission layer for the k+1th time; 1 ⁇ j ⁇ J-1, and j is an integer.
  • the precoding vector used to precode the data transmitted on each transmission layer can be determined according to the feedback of the terminal device based on this transmission layer.
  • the terminal device can carry feedback for multiple transport layers through the feedback information sent at one time. It is beneficial for the network device to determine the precoding vector for precoding the data transmitted by each transmission layer based on the feedback of each transmission layer.
  • the method further includes: receiving a reset indication from a precoding vector set, the precoding vector set reset indication being used to indicate a reset-based precoding
  • the set of coding vectors performs channel measurement.
  • the terminal device is recommended to reset the precoding vector set, and then perform channel measurement again, so that it can quickly search for the direction of the terminal device and determine the appropriate channel.
  • the precoding vector used for data transmission is recommended to reset the precoding vector set, and then perform channel measurement again, so that it can quickly search for the direction of the terminal device and determine the appropriate channel.
  • a channel measurement method is provided.
  • the method may be executed by the terminal device, or may also be executed by a chip configured in the terminal device. This application does not limit this.
  • the method includes: generating feedback information based on the received precoding reference signal, the feedback information being used to indicate the weight of one or more precoding vectors, and the one or more precoding vectors are used to generate the The precoding vector of the precoding reference signal; sending the feedback information, and the feedback information is used to determine the precoding vector used for data transmission on each transmission layer.
  • the terminal device can perform channel measurement and feedback based on the precoding reference signal sent multiple times by the network device.
  • the precoding reference signal used by the precoding reference signal sent by the network device each time refers to the information fed back by the terminal device in the previous time, so it can get closer and closer to the direction of the terminal device, so that the feedback of the terminal device obtained is more Precise.
  • the network device can determine the precoding vector used to precode the data based on the latest feedback of the terminal device, and the determined precoding vector can be considered as the one closest to the direction of the terminal device in the currently obtained channel measurement results. The precoding direction is therefore helpful to improve data transmission performance.
  • the generating feedback information based on the received precoding reference signal includes: based on a predetermined observation matrix W and the received precoding reference signal , Determine the weight of the one or more precoding vectors;
  • W S(U ⁇ ) -1 ;
  • U and ⁇ are matrices obtained by singular value decomposition of the channel matrix H;
  • U is an R-dimensional unitary matrix, and ⁇ is R Dimensional diagonal matrix;
  • S is a matrix with Z rows and R columns, each row in S includes R-1 zero elements, and the z-th element in the z-th row in S is 1; 1 ⁇ z ⁇ Z, Z means The rank of the channel matrix H, R represents the number of receiving antennas, and z, Z, T, and R are all integers; the feedback information is generated based on the weight of the one or more precoding vectors.
  • the terminal device can accurately calculate the weight of each precoding vector and feed it back to the network device.
  • the method further includes:
  • the terminal device is recommended to reset the precoding vector set, and then perform channel measurement again, so that it can quickly search for the direction of the terminal device and determine the appropriate channel.
  • the precoding vector used for data transmission is recommended to reset the precoding vector set, and then perform channel measurement again, so that it can quickly search for the direction of the terminal device and determine the appropriate channel.
  • a communication device which includes modules or units for executing the method in the first aspect and any one of the possible implementation manners of the first aspect.
  • a communication device including a processor.
  • the processor is coupled with the memory and can be used to execute instructions in the memory to implement the foregoing first aspect and the method in any one of the possible implementation manners of the first aspect.
  • the communication device further includes a memory.
  • the communication device further includes a communication interface, and the processor is coupled with 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 a 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 which includes modules or units for executing the second aspect and the method in any one of the possible implementation manners of the second aspect.
  • a communication device including a processor.
  • the processor is coupled with the memory and can be used to execute instructions in the memory to implement the foregoing second aspect and the method in any one of the possible implementation manners of the second aspect.
  • the communication device further includes a memory.
  • the communication device further includes a communication interface, and the processor is coupled with 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 one of the first aspect to the second aspect and the first aspect to the second aspect. The method in the way.
  • the above-mentioned processor can be one or more chips
  • the input circuit can be an input pin
  • the output circuit can be an output pin
  • the processing circuit can be a transistor, a gate circuit, a flip-flop, and various logic circuits, etc.
  • 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 can be the same circuit, which is used as an input circuit and an output circuit at different times.
  • the embodiments of the present application do not limit the specific implementation manners 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, receive signals through a receiver, and transmit signals through a transmitter to execute any one of the first aspect to the second aspect and the first aspect to the second aspect.
  • 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 may be provided separately.
  • the memory can be a non-transitory (non-transitory) memory, such as a read only memory (ROM), which can be integrated with the processor on the same chip, or can be set in different On the chip, the embodiment of the present application does not limit the type of memory and the setting mode of 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 the processor receiving input capability information.
  • the data output by the processor can be output to the transmitter, and the input data received by the processor can come from the receiver.
  • the transmitter and receiver can be collectively referred to as a transceiver.
  • the processing device in the above eighth aspect may be one or more chips.
  • the processor in the processing device can be implemented by hardware or software.
  • the processor may be a logic circuit, integrated circuit, etc.; when implemented by software, the processor may be a general-purpose processor, which is implemented by reading software codes stored in the memory, and the memory may Integrated in the processor, can be located outside of the processor, and exist independently.
  • a computer program product includes: a computer program (also called code, or instruction), which when the computer program is executed, causes the computer to execute the first aspect to the first aspect.
  • a computer program also called code, or instruction
  • a computer-readable medium stores a computer program (also called code, or instruction) when it runs on a computer, so that the computer executes the first aspect to the first aspect.
  • a computer program also called code, or instruction
  • a communication system including the aforementioned network equipment and terminal equipment.
  • FIG. 1 is a schematic diagram of a communication system applicable to the channel measurement method provided by an embodiment of the present application
  • FIG. 2 is a schematic flowchart of a channel measurement method provided by an embodiment of the present application.
  • FIG. 3 is a schematic block diagram of a communication device provided by an embodiment of the present application.
  • Figure 4 is a schematic structural diagram of a terminal device provided by an embodiment of the present application.
  • Figure 5 is a schematic structural diagram of a network device provided by an embodiment of the present application.
  • GSM global system for mobile communications
  • CDMA code division multiple access
  • WCDMA broadband code division multiple access
  • GPRS general packet radio service
  • LTE long term evolution
  • FDD frequency division duplex
  • TDD LTE Time division duplex
  • UMTS universal mobile telecommunication system
  • WiMAX worldwide interoperability for microwave access
  • FIG. 1 is a schematic diagram of a communication system 100 applicable to the channel measurement method of the 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 may communicate through a wireless link.
  • Each communication device, such as the network device 110 or the terminal device 120 can be equipped with multiple antennas.
  • the configured multiple antennas may include at least one transmitting antenna for transmitting signals and at least one receiving 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 a wireless transceiver function.
  • the network equipment includes but not limited to: evolved Node B (eNB), radio network controller (RNC), Node B (NB), base station controller (BSC) ), base transceiver station (base transceiver station, BTS), home base station (for example, home evolved NodeB, or home Node B, HNB), baseband unit (BBU), wireless fidelity (wireless fidelity, WiFi) systems
  • the access point (AP), wireless relay node, wireless backhaul node, transmission point (TP) or transmission and reception point (TRP), etc. can also be 5G, for example, NR, gNB in the system, or transmission point (TRP or TP), one or a group of antenna panels (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 , Such as baseband unit (BBU), or distributed unit (DU), etc.
  • BBU base
  • the gNB may include a centralized unit (CU) and a DU.
  • the gNB may also include an active antenna unit (AAU for short).
  • CU implements some functions of gNB
  • DU implements some functions of gNB.
  • CU is responsible for processing non-real-time protocols and services, implementing radio resource control (RRC), and packet data convergence protocol (PDCP) The function of the layer.
  • RRC radio resource control
  • PDCP packet data convergence protocol
  • the DU is responsible for processing physical layer protocols and real-time services, and realizes the functions of the radio link control (RLC) layer, media access control (MAC) layer, and physical (PHY) layer.
  • RLC radio link control
  • MAC media access control
  • PHY physical
  • the network device may be a device that includes one or more of a CU node, a DU node, and an AAU node.
  • the CU can be divided into network equipment in an access network (radio access network, RAN), or the CU can be divided into network equipment in a core network (core network, CN), which is not limited in this application.
  • terminal equipment in the wireless communication system may also be referred to as user equipment (UE), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile equipment, 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 (mobile phone), a tablet computer (pad), a computer with wireless transceiver function, a virtual reality (VR) terminal device, and an augmented reality (AR) terminal Equipment, wireless terminals in industrial control, wireless terminals in unmanned driving (self-driving), wireless terminals in remote medical, wireless terminals in smart grid, transportation safety ( Wireless terminals in transportation safety, wireless terminals in smart cities, wireless terminals in smart homes, mobile terminals configured in transportation, and so on.
  • the embodiment of this application does not limit the application scenario.
  • FIG. 1 is only a simplified schematic diagram of an example for ease of understanding, and 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 transmission may be executed by a network device, or may be executed by a chip configured in the network device.
  • network devices For the convenience of description, collectively referred to as network devices below.
  • the codeword may be coded bits that have been coded (for example, including channel coding).
  • the codeword is scrambling to generate scrambled bits.
  • the scrambled bits undergo modulation mapping (modulation mapping) to obtain modulation symbols.
  • Modulation symbols are mapped to multiple layers, or transmission layers, through layer mapping.
  • the modulation symbols after layer mapping are precoding (precoding) to obtain a precoded signal.
  • the precoded signal is mapped to multiple REs after resource element (resource element, RE) mapping. These REs are then modulated by orthogonal frequency division multiplexing (OFDM) and then transmitted through an antenna port (antenna port).
  • OFDM orthogonal frequency division multiplexing
  • the sending device (such as network equipment) can process the signal to be sent by using a precoding matrix that matches the channel state when the channel state is known, so that the precoded signal to be sent and the channel Adaptation, thereby reducing the complexity of the receiving device (such as the terminal device) to eliminate the influence between channels. Therefore, through the precoding processing of the signal to be transmitted, the quality of the received signal (for example, the signal to interference plus noise ratio (SINR), etc.) can be improved. Therefore, the use of precoding technology can realize the transmission on the same time-frequency resource between the sending device and multiple receiving devices, that is, the realization of multiple user multiple input multiple output (MU-MIMO).
  • MU-MIMO multiple user multiple input multiple output
  • the sending device may also perform precoding in other ways. For example, when channel information (such as but not limited to a channel matrix) cannot be obtained, precoding is performed using a preset precoding matrix or a weighting processing method. For the sake of brevity, its specific content will not be repeated in this article.
  • Precoding reference signal also known as beamformed reference signal.
  • the beamforming reference signal may be a reference signal that has undergone precoding processing, and may be similar to a Class B (Class B) reference signal in the LTE protocol.
  • Class B Class B
  • the reference signal that has not undergone precoding processing may be similar to the Class A reference signal in the LTE protocol.
  • the precoded reference signal is referred to as a precoding reference signal; the reference signal that has not been precoded is referred to as a reference signal for short.
  • the reference signal involved in the embodiment of the present application may be a reference signal used for channel measurement.
  • the reference signal may be a channel state information reference signal (CSI-RS) or a sounding reference signal (sounding reference signal, SRS).
  • CSI-RS channel state information reference signal
  • SRS sounding reference signal
  • Antenna port referred to as port. It can be understood as a virtual antenna recognized by the receiving device. Or transmit antennas 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. Each antenna port can correspond to a 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 the port of the reference signal after precoding.
  • the antenna port may refer to the transmitting antenna port.
  • the reference signal of each port may be a reference signal that has not been precoded.
  • An antenna port may also refer to a reference signal port after precoding.
  • the reference signal of each port may be a precoding reference signal obtained by precoding the reference signal based on a precoding vector.
  • the signal of each port can be transmitted through one or more resource blocks (RB).
  • the transmitting antenna port may also be referred to as transmitting antenna. Specifically, it may refer to an actual independent transceiver unit (transceiver unit, TxRU).
  • the number of transmit antenna ports may be equal to the number of transceiver units. It is understandable that if the reference signal is pre-coded, the number of ports may refer to the number of reference signal ports, and the number of reference signal ports may be less than the number of transmit antenna ports. Therefore, by precoding the reference signal, the dimensionality of the transmitting antenna port can be reduced, thereby achieving the purpose of reducing pilot overhead.
  • the specific meaning expressed by the port can be determined according to the specific embodiment.
  • the receiving end can determine the channel through a variety of possible implementation methods. For example, the receiving end may perform channel estimation according to the received reference signal; for another example, the receiving end may estimate the channel according to the reciprocity of the uplink and downlink channels. This application does not limit this.
  • the terminal equipment can estimate the downlink channel according to the received reference signal.
  • the downlink channel can be denoted as H, for example.
  • the downlink channel can be expressed as a matrix with a dimension of R ⁇ T, for example.
  • R is the number of receiving antennas
  • T is the number of transmitting antenna ports, or the number of TxRUs. Both R and T are positive integers.
  • the terminal device can estimate the downlink channel based on the received precoded reference signal.
  • the downlink channel estimated by the terminal equipment from the precoding reference signal is actually a precoding channel, which can be called an equivalent channel.
  • the precoding vector is b
  • the precoding vector is a vector with a dimension of T ⁇ 1. It can be seen that when the network device precodes the reference signal based on a precoding vector, the dimension of the equivalent channel estimated by the terminal device is R ⁇ 1. That is, the dimensionality reduction of the transmitting antenna port is realized.
  • the precoding vector refers to a vector used to precode the reference signal.
  • the precoding vector may be selected from a predetermined set of precoding vectors.
  • the precoding vector set may include multiple optional precoding vectors.
  • the precoding vector in the precoding vector set may be updated with the feedback of the terminal device to adapt to the change of the channel and obtain more accurate feedback of the terminal device.
  • the precoding vector may be a column vector of length T, for example.
  • the precoding vector set may include T column vectors of the length T.
  • the T column vectors can be orthogonal to each other.
  • the T column vectors may be vectors taken from a discrete Fourier transform (DFT) matrix.
  • DFT discrete Fourier transform
  • the precoding vector sometimes refers to the precoding vector used to precode the reference signal, and sometimes refers to the precoding vector used to precode the data to be transmitted.
  • the technical personnel of this application can understand its specific meaning in different scenarios.
  • the precoding vector used for precoding the reference signal is denoted by b
  • the precoding vector used for precoding the data to be transmitted is denoted by p.
  • this is indicated by different letters only to facilitate the distinction, and should not constitute any limitation to the application.
  • Precoding matrix indicator The following row channel measurement is taken as an example.
  • the terminal device can carry the precoding matrix to be fed back determined based on the channel measurement in the channel state information (channel state information) through the PMI. state information, CSI) report, so that the network device can determine the precoding vector used for each transmission layer when transmitting data through one or more transmission layers according to the PMI, or in other words, determine the precoding used for data transmission according to the PMI matrix.
  • channel state information channel state information
  • CSI state information
  • the terminal device may perform channel estimation based on the received precoding reference signal of each port to obtain an equivalent channel corresponding to each port.
  • the terminal device may feed back the equivalent channel obtained by channel estimation based on the precoding reference signal of each port to the network device through the weight of the precoding vector. So that the network equipment can understand the weight of each precoding vector used for precoding the reference signal, so that it can determine the precoding vector used to precode the data to be transmitted on each transmission layer, and it can also be used for the next time Update the precoding vector when precoding the reference signal.
  • the precoding matrix can be determined directly based on the feedback of the terminal device, or through some beamforming methods, such as zero forcing (ZF). ), minimum mean-squared error (MMSE), maximum signal-to-leakage-and-noise (SLNR), etc., to obtain the final precoding matrix for downlink data transmission.
  • ZF zero forcing
  • MMSE minimum mean-squared error
  • SLNR maximum signal-to-leakage-and-noise
  • the precoding matrix used for data transmission mentioned in the following may all refer to a precoding matrix determined based on the channel measurement method provided in this application.
  • Transport layer It can also be called a transport stream.
  • the number of transmission layers used for data transmission between the network device and the terminal device may be determined by the rank of the channel matrix.
  • the terminal equipment can determine the number of transmission layers according to the channel matrix obtained by channel estimation.
  • the precoding matrix can be determined by performing singular value decomposition (SVD) on the channel matrix or the covariance matrix of the channel matrix. In the SVD process, different transmission layers can be distinguished according to the size of the characteristic value. For example, the precoding vector determined by the eigenvector corresponding to the largest eigenvalue can be corresponding to the first transmission layer, and the precoding vector determined by the eigenvector corresponding to the smallest eigenvalue can be transmitted to the Lth transmission layer. Layer correspondence. That is, the eigenvalues corresponding to the first transmission layer to the Lth transmission layer decrease sequentially.
  • the sender hopes to obtain a more accurate channel state, and uses a precoding matrix that matches the channel state to process the signal to be sent, so as to eliminate inter-channel interference and improve signal quality.
  • the uplink and downlink channels transmit signals on the same frequency domain resources and different time domain resources.
  • TDD time division duplexing
  • the network equipment can measure the uplink channel based on the uplink reference signal, such as sounding reference signal (SRS).
  • SRS sounding reference signal
  • the uplink and downlink channels do not have complete reciprocity, and the uplink channel is used to
  • the precoding matrix determined for downlink transmission may not be able to adapt to the downlink channel. If the network device still estimates the downlink channel based on the uplink channel measured by the uplink reference signal, the estimated downlink channel may not be accurate. Therefore, the precoding matrix used for data transmission determined by the network device based on the estimated downlink channel may also be adapted to the real downlink channel. Eventually, the quality of data transmission will decrease and system performance will decrease.
  • FDD frequency division duplexing
  • the present application provides a channel measurement method, hoping to obtain a more accurate channel state between the sending end and the receiving end, so that a reasonable precoding matrix can be selected to precode the data to be transmitted to improve the quality of data transmission. Improve system performance.
  • L The number of transmission layers that the network device can use.
  • the number of transmission layers that a network device can use can be determined by the number of transmit antenna ports configured by the network device.
  • the number of transmit antenna ports mentioned here may refer to the number of TxRUs.
  • L ⁇ 1, and L is an integer; for example, the L transmission layers may include the first transmission layer to the Lth transmission layer.
  • Z The number of transmission layers that a network device can use when communicating with a terminal device. That is, the rank of the channel matrix. Z can be determined by the channel matrix. The number of transmission layers that a network device can use when communicating with a terminal device can be determined by the number of transmitting antenna ports configured by the network device and the number of receiving antennas configured by the terminal device. For example, Z may be less than or equal to the smaller number of the number of transmit antenna ports configured by the network device and the number of receive antenna ports configured by the terminal device. In the embodiment of the present application, L ⁇ Z ⁇ 1, and Z is a positive integer.
  • T the number of transmitting antenna ports, T is a positive integer
  • R The number of receiving antennas, R is a positive integer.
  • serial numbers can be started from 1.
  • the L transmission layers may include the first transmission layer to the Lth transmission layer, and so on, which will not be illustrated one by one here.
  • the specific implementation is not limited to this, for example, the serial number may also start from 0.
  • used to indicate may include used for direct indication and used for indirect indication.
  • the indication information may directly indicate I or indirectly indicate I, but it does not mean that I must be carried in the indication information.
  • the information indicated by the instruction information is called the information to be indicated.
  • the information to be indicated can be directly indicated, such as the information to be indicated or the information to be indicated. Indicates the index of the information, etc.
  • the information to be indicated can also be indicated indirectly 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, and other parts of the information to be indicated are known or agreed in advance. For example, it is also possible to realize the indication of specific information by means of the pre-arranged order (for example, stipulated in the agreement) of various information, 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 parts in terms of composition or other attributes.
  • the specific indication manner may also be various existing indication manners, such as, but not limited to, the foregoing indication manner and various combinations thereof.
  • the specific details of the various indication modes can be referred to the prior art, which will not be repeated here. It can be seen from the above that, for example, when multiple pieces of information of the same type need to be indicated, a situation where different information is indicated in different ways may occur.
  • the required instruction method can be selected according to specific needs.
  • the embodiment of the application does not limit the selected instruction method.
  • the instruction method involved in the embodiment of the application should be understood as covering the instructions to be Various methods for obtaining information to be indicated.
  • a row vector can be expressed as a column vector
  • a matrix can be expressed by the transposed matrix of the matrix
  • a matrix can also be expressed in the form of a vector or an array. It can be formed by connecting each row vector or column vector of the matrix, and the Kronecker product of two vectors can also be expressed in the form of the product of one vector and the transposed vector of another vector.
  • the information to be instructed can be sent together as a whole, or divided into multiple sub-information to be sent separately, and the sending period and/or sending timing of these sub-information can 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 configured by the transmitting end device by sending configuration information to the receiving end device.
  • the configuration information may include, but is not limited to, radio resource control signaling, such as RRC signaling, MAC layer signaling, such as MAC-CE signaling and physical layer signaling, such as downlink control information (DCI) One or a combination of at least two of them.
  • radio resource control signaling such as RRC signaling
  • MAC layer signaling such as MAC-CE signaling
  • DCI downlink control information
  • pre-defined or “pre-configured” can be implemented by pre-saving corresponding codes, tables or other methods that can be used to indicate relevant information in the device (for example, including terminal devices and network devices).
  • the specific implementation method is not limited.
  • saving may refer to saving in one or more memories.
  • the one or more memories may be provided separately, or integrated in an encoder or decoder, a processor, or a communication device.
  • the one or more memories may also be partly provided separately, and partly integrated in the decoder, processor, or communication device.
  • the type of the memory may be any form of storage medium, which is not limited in this application.
  • the “protocols” involved in the embodiments of the present application may refer to standard protocols in the communication field, for example, may include LTE protocol, NR protocol, and related protocols applied to future communication systems, which are not limited in this application.
  • At least one refers to one or more, and “multiple” refers to two or more.
  • And/or describes the association relationship of the associated objects, indicating that there can be three relationships, for example, A and/or B, which can mean: A alone exists, both A and B exist, and B exists alone, where A, B can be singular or plural.
  • the character “/” generally indicates that the associated objects are in an "or” relationship.
  • "The following at least one item (a)” or similar expressions refers to any combination of these items, including any combination of a single item (a) or plural items (a).
  • At least one of a, b, and c can mean: 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 can be single or multiple.
  • the method provided in the embodiments of the present application can be applied to a system that communicates through multi-antenna technology.
  • 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 be used to communicate between network equipment and terminal equipment.
  • the method provided in the embodiments of the present application is not limited to the communication between the network device and the terminal device, and can also be applied to the communication between the terminal device and the terminal device.
  • the application does not limit the application scenarios of the method. In the embodiments shown below, only for ease of understanding and description, the interaction between a network device and a terminal device is taken as an example to describe in detail the channel measurement method provided in the embodiments of the present application.
  • the embodiments shown below do not particularly limit the specific structure of the execution body of the method provided by the embodiments of the present application, as long as the program that records the code of the method provided by the embodiments of the present application can be run according to the present application.
  • the method provided in the application embodiment only needs to communicate.
  • the execution subject of the method provided in the embodiment of the application may be a terminal device or a network device, or a functional module in the terminal device or network device that can call and execute the program.
  • FIG. 2 is a schematic flowchart of a channel measurement method 200 provided by an embodiment of the present application from the perspective of device interaction. Specifically, the method 200 shown in FIG. 2 is an example of downlink channel measurement. As shown in the figure, the method 200 may include step 210 to step 270. The steps in the method 200 are described in detail below.
  • the network device sends a precoding reference signal, where the precoding reference signal is obtained by precoding the reference signal based on N precoding vectors.
  • the N precoding vectors may be determined from a predetermined set of precoding vectors, for example.
  • the precoding vector set may be, for example, a precoding vector set configured in advance, or may be a precoding vector set obtained after updating the precoding vector set according to feedback information from the terminal device. This application does not limit this.
  • the network device precodes the reference signal based on the N precoding vectors, and the obtained precoding reference signal may correspond to the N reference signal ports.
  • Each reference signal port corresponds to a precoding vector.
  • the reference signal that can be identified by the terminal device is the precoding reference signal of N ports. Since the specific process of the network device precoding the reference signal based on the precoding vector can refer to the prior art, for the sake of brevity, it will not be repeated here.
  • the network device may precode the reference signal transmitted through each of the L transmission layers based on the N precoding vectors.
  • the precoding reference signal transmitted through any one of the L transmission layers may be obtained by precoding the reference signal based on the N precoding vectors.
  • the precoding reference signal transmitted by each of the L transmission layers corresponds to N ports.
  • the network device may precode the reference signal for transmission of a certain transmission layer among the L transmission layers based on the N precoding vectors.
  • the N precoding vectors correspond to a certain transmission layer of the L transmission layers
  • the precoding reference signal transmitted on the transmission layer is obtained by precoding the reference signal based on the N precoding vectors .
  • the precoding reference signal transmitted on the transmission layer corresponds to N ports.
  • the reference signal sent by the network device through each transmission layer can respectively use different precoding vectors to precode the reference signal.
  • the network device may use N l (that is, an example of N) precoding vectors to precode the reference signal.
  • N l that is, an example of N
  • reference signals sent through different transmission layers may be pre-encoded using different precoding vectors, and the number of precoding vectors corresponding to each transmission layer may be different from each other, or partially the same, or completely the same. . This application does not limit this.
  • the reference signals transmitted by the network device through the L transport layers may be reference signals sent to the same terminal device, or reference signals sent to different terminal devices. This application does not limit this.
  • the precoding reference signal transmitted by a network device through a certain transport layer for example, the precoding reference signal transmitted through the first transmission layer of the L transport layers, is a reference sent to the same terminal device. signal.
  • the first transmission layer may be any one of the L transmission layers.
  • the precoding reference signal obtained by the network device precoding the reference signal based on N precoding vectors is the reference signal sent to the same terminal device.
  • the reference signal sent by the network device to the same terminal device can be transmitted through one or more transport layers.
  • the precoding reference signal transmitted by each transmission layer can be obtained by precoding the reference signal based on the same N precoding vectors, or in different
  • the transmission layer is obtained by precoding the reference signal based on different precoding vectors.
  • the precoding reference signal received by the terminal device on the lth transmission layer is obtained by precoding the reference signal based on N precoding vectors.
  • step 220 the terminal device generates feedback information, which is determined based on the precoding reference signal received by the terminal device.
  • the reference signal that can be recognized by the terminal device on a transmission layer is the precoding reference signal of N ports, that is, the reference signal corresponding to the N precoding vectors.
  • the terminal device can perform channel measurement based on the precoding reference signal of each port to determine the feedback information.
  • the terminal device may generate feedback information based on a predetermined observation matrix and the received precoding reference signal.
  • the terminal device may construct an observation matrix based on the channel matrix.
  • the terminal equipment can estimate the downlink channel.
  • the downlink channel specifically refers to a downlink channel that has not been precoded, that is, the downlink channel H mentioned above.
  • the terminal device may estimate the downlink channel based on the reference signal sent by the network device without precoding, for example.
  • the terminal equipment may also estimate the downlink channel H according to the reciprocity of the uplink and downlink channels. This application does not limit this.
  • H U ⁇ V H.
  • U is an R-dimensional unitary matrix
  • V is a T-dimensional unitary matrix
  • ⁇ is an R-dimensional diagonal matrix.
  • the observation matrix W can be:
  • [1 0... 0] is a matrix with one row and R columns, the W can be applied to R ⁇ 1;
  • the rank is 2, It is a matrix with two rows and R columns, and the W can be applied to R ⁇ 2;
  • the rank is 3
  • It is a matrix with three rows and R columns, and the W can be applied to R ⁇ 3;
  • the W can be applied to R ⁇ L.
  • S is a matrix of Z rows and R columns. Each row in S includes R-1 zero elements, and the z-th element in the z-th row in S is 1.
  • Z represents the rank of the channel matrix. That is, the network device can communicate with the terminal device through Z transport layers at most.
  • z represents the z-th transmission layer in Z transmission layers, 1 ⁇ z ⁇ Z, Z ⁇ L, and both z and Z are positive integers.
  • the equivalent channel Hb can be estimated from the reference signal port corresponding to a certain precoding vector b. Then the terminal device multiplies the equivalent channel by the observation matrix W, that is, WHb. Then the terminal device can obtain L observation values.
  • ⁇ b,1 may represent the weight of the precoding vector b fed back for the first transmission layer
  • ⁇ b,2 may represent the weight of the precoding vector b fed back for the second transmission layer.
  • the precoding vector used to precode the data can be determined according to the weight of each precoding vector that precodes the reference signal fed back by the terminal device.
  • the precoding vector used to precode the data is denoted as the target precoding vector hereinafter.
  • the weights of feedback for N precoding vectors b 1 , b 2 ,..., b N are respectively.
  • the target precoding vector used for precoding the data can be determined, and the target precoding vector may be, for example, Or a vector obtained after processing the vector p (such as zero-forcing, MMSE, or SLNR processing).
  • a vector obtained by weighting the N precoding vectors is used as the target precoding vector.
  • the specific method for processing the weighted sum of the N precoding vectors can refer to the prior art, and the processing process is an internal implementation behavior of the network device, which is not limited in this application.
  • the weight of the precoding vector b fed back for the first transmission layer mentioned above may refer to the weight of the precoding vector b used to generate the target precoding vector when data is transmitted through the first transmission layer;
  • the weight of the precoding vector b fed back by the second transmission layer may refer to the weight of the precoding vector b used to generate the target precoding vector when data is transmitted through the second transmission layer.
  • the observation matrix can convert the R received signals corresponding to the same reference signal port on the R receiving antennas into Z observation values, thereby reducing the amount of feedback.
  • the precoding reference signal transmitted by each transmission layer can be obtained by precoding the reference signal based on the same N precoding vectors.
  • the N precoding vectors are denoted as b 1 , b 2 ,..., b N , and the number of transmission layers is 2. It can be considered that the precoding reference signal generated by the network device through the N precoding vectors can be used to perform channel measurement on the channels of the two transmission layers.
  • the terminal device can respectively indicate the weight of each precoding vector in each transmission layer among the N precoding vectors through the feedback information.
  • the precoding reference signal generated by the precoding vector b 1 can be obtained by channel measurement: the weight of the precoding vector b 1 fed back for the first transmission layer And the weight of the precoding vector b 1 fed back for the second transmission layer
  • the precoding reference signal generated by the precoding vector b N can be obtained by channel measurement: the weight of the precoding vector b N fed back for the first transmission layer And the weight of the precoding vector b N fed back for the second transmission layer
  • the precoding reference signal transmitted by each transmission layer may be obtained by precoding the reference signal based on different precoding vectors.
  • the N 1 precoding vectors used to precode the reference signal on the first transmission layer can be denoted as
  • the N 2 precoding vectors used to precode the reference signal on the second transmission layer can be denoted as
  • the terminal device can perform channel measurement based on the precoding reference signal of the N 1 ports received on the first transmission layer to determine the weight of the N 1 precoding vector
  • the terminal device may also perform channel measurement based on the precoding reference signals of the N 2 ports received on the second transmission layer to determine the weight of the N 2 precoding vectors
  • the terminal device can be based on the corresponding observation matrix when the number of transmission layers is 1.
  • the channel of each transmission layer is measured separately.
  • the observation value obtained by the terminal device based on the precoding reference signal received on the first transmission layer can be used to determine the weight of N 1 precoding vectors, and the terminal device can be measured based on the precoding reference signal received on the second transmission layer
  • the obtained observations can be used to determine the weights of N 2 precoding vectors.
  • the terminal device can also perform channel measurement based on the corresponding observation matrix when the number of transmission layers is greater than 1.
  • the terminal device is based on the first observation value (that is, the observation value corresponding to the first observation value) among the multiple observation values (that is, the observation values corresponding to the multiple transmission layers) measured based on the precoding reference signal received on the first transmission layer.
  • the observation value corresponding to the transmission layer can be used to determine the weight of the N 1 precoding vector.
  • the terminal device is based on the multiple observation values measured by the precoding reference signal received on the second transmission layer (that is, it is related to multiple transmissions).
  • the first observation (that is, the observation corresponding to the first transmission layer) in the observation value corresponding to the layer can be used to determine the weight of the N 2 precoding vectors.
  • the terminal device may determine the signal strength of each precoding reference signal relative to the strength of the precoding reference signal with the highest strength according to the received signal strength of the precoding reference signal of each port. Ratio, and then generate feedback information. That is, the feedback information can be used to indicate the ratio of the signal strength of the precoding reference signals of multiple ports. Since the ratio of the signal strength of the precoding reference signals of the multiple ports can reflect to a certain extent which direction is closer to the direction of the terminal device, the feedback information can be used to indicate the corresponding direction of each port in the direction close to the terminal device. The weight of the precoding vector.
  • the terminal device may generate feedback information based on the determined weight of each precoding vector.
  • the observation value determined by the terminal device through the observation matrix is the conjugate of the weight of each precoding vector.
  • the terminal device can directly feed back the conjugate of each observation value (that is, the weight of each precoding vector) to the network device.
  • the terminal device may determine the element with the largest modulus value as the normalization coefficient from the multiple weights corresponding to the N ports.
  • the amplitude of the element with the largest modulus value is defined as 1, and the phase is defined as 0.
  • the terminal device may further calculate the relative amplitude and relative phase of other elements with respect to the normalized coefficient.
  • the terminal device may quantize the relative amplitude and relative phase of other elements with respect to the normalized coefficient to generate feedback information.
  • the feedback information may include, for example, the index of the normalized coefficient and the quantized value of the relative amplitude and phase of other elements with respect to the normalized coefficient.
  • the terminal device may calculate the relative amplitude and relative phase of other elements with respect to the normalized coefficient. For example, it can be determined by difference or inner product. This application does not limit this. It should also be understood that the manner described above for generating feedback information of multiple weights may be referred to as a normalized manner. For the specific method for the terminal device to generate feedback information through the normalized direction, reference may be made to the prior art. For brevity, a detailed description of the specific process is omitted here.
  • the terminal device may also quantize the weight of each precoding vector to generate feedback information.
  • step 230 the terminal device sends the feedback information.
  • the network device receives the feedback information.
  • the terminal device may carry the feedback information through the PMI in the CSI report, for example.
  • the terminal device may also carry the feedback information through other signaling.
  • the signaling used to carry the feedback information may be existing signaling or newly-added signaling. This application does not limit this.
  • the terminal device can send the feedback information to the network device through physical uplink resources, such as physical uplink share channel (PUSCH) or physical uplink control channel (PUCCH), so that the network device can respond to the feedback
  • PUSCH physical uplink share 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 in the prior art. For brevity, detailed description of the specific process is omitted here.
  • the weights of the multiple precoding vectors fed back by the terminal device can also be used to determine the precoding vector for generating the precoding reference signal next time.
  • step 240 the network device determines a precoding vector for generating a precoding reference signal to be sent next time according to the feedback information.
  • N precoding vectors as an example to illustrate the specific process of the network device determining the precoding vector used to generate the precoding reference signal next time.
  • the N precoding vectors are recorded as N k precoding vectors, then the N k precoding vectors are the precoding vectors used in the k-th channel measurement, and the terminal device sends the
  • the feedback information of the weight of the N k precoding vectors is the feedback information sent for the kth time. It is understandable that the feedback information sent for the kth time is obtained by channel measurement based on the precoding reference signal sent by the network device for the kth time, and the precoding reference signal sent for the kth time may be based on N k precoding vectors. It is obtained by precoding the reference signal.
  • the weights of the N k precoding vectors may be used to determine the precoding reference signal transmitted for the k+1th time.
  • N k+1 precoding vectors for generating the precoding reference signal for the k+1th transmission and N k+1 is a positive integer.
  • the network device may be based on the precoding vectors N k and N k th weight vector precoding weight may determine a precoding vector N k + 1 precoding vectors.
  • the N k + 1 precoding vectors additionally N k + 1 -1 precoding vectors may be taken from a predetermined precoding vector set.
  • the weighted sum b (k) may be determined based on the N k precoding vectors and the weights of the N k precoding vectors.
  • the weighted sum b (k) can be used as one of the N k+1 precoding vectors. It can be understood that the weighted sum b (k) may be the same as the target precoding vector p described above. This is because the above-mentioned target precoding vector p is also obtained by weighting the target precoding vector.
  • the N k + 1 precoding vectors additionally N k + 1 -1 precoding vectors may be taken from a predetermined precoding vector set.
  • the predetermined precoding vector set may be, for example, a pre-configured precoding vector set, or a precoding vector set updated based on feedback information of the terminal device.
  • the network device can directly determine the precoding vector used for precoding the reference signal from the weighted sum of the N k precoding vectors.
  • the updated precoding vector set of the network device is recorded as the first precoding vector set, and the unupdated precoding vector set is recorded as the second precoding vector set.
  • the feedback information received for the first time is used to indicate the weights of N I precoding vectors, and the N I precoding vectors are precoding vectors used to generate the precoding reference signal transmitted for the first time.
  • the feedback information received for the first time may be used to determine the precoding vector used to generate the first precoding vector set.
  • the network device can determine the weighted sum of N I precoding vectors based on the feedback information received for the first time. Due to the weighted sum It is obtained based on the channel measurement of the precoding reference signal generated by precoding the reference signal by N I precoding vectors, and based on the weighted sum The direction of the signal transmitted by precoding the signal is infinitely close to the direction of the terminal device. The network device can make a slight disturbance based on this direction, and multiple vectors can be obtained.
  • network devices can be based on weighted sums In the row where the element b with the largest amplitude is located, generate T-1 Givens rotation matrices G(m, t, ⁇ ) or G(t, m, ⁇ ).
  • m means b is in The row index in and m is a positive integer, 1 ⁇ m ⁇ T; t takes an integer value from 1 to T and t ⁇ c, and ⁇ represents the angle of rotation.
  • T-1 Givens rotation matrices G(m, t, ⁇ ) or G(t, m, ⁇ ) another N k+1 -1 precoding vectors in the first set of precoding vectors can be generated.
  • G can be a matrix with T rows and T columns.
  • Other diagonal elements are 1, and non-diagonal elements are 0.
  • T ⁇ T matrix S Based on the Givens rotation matrix G(m, t, ⁇ ), the T ⁇ T matrix S can be constructed as follows:
  • T ⁇ T matrix S Based on the Givens rotation matrix G(t, m, ⁇ ), the T ⁇ T matrix S can be constructed as follows:
  • Each vector in the matrix S constructed by the above-mentioned Givens rotation matrix includes the weighted sum of the aforementioned N I precoding vectors And another T-1 precoding vectors constructed from the weighted sum.
  • the terminal device may further check whether the T column vectors are linearly related, that is, whether the matrix S is full rank. If the rank is full, perform Schmidt orthogonalization on the T linearly independent column vectors in the matrix S to obtain the matrix formed by the first set of precoding vectors
  • the superscript (1) indicates the matrix formed by the set of precoding vectors obtained after one update.
  • the matrix constituted by the set of precoding vectors mentioned here may refer to a matrix obtained by arranging each column vector in a predetermined order.
  • the matrix composed of T T-dimensional precoding vectors may be a matrix with a dimension of T ⁇ T.
  • the obtained first precoding vector set may include at least T precoding vectors.
  • the first precoding vector set includes T precoding vectors.
  • the first precoding vector set includes o ⁇ T precoding vectors, and o is an oversampling factor.
  • the o ⁇ T precoding vectors can be generated, for example, by interpolating the aforementioned T equally spaced precoding vectors.
  • the specific implementation of oversampling can refer to the prior art, which is not limited in this application.
  • part or all of the precoding vectors in the aforementioned N I precoding vectors may be precoding vectors taken from the second precoding vector set.
  • the N I precoding vectors may all be taken from a second precoding vector set.
  • I may be 1, that is, the precoding reference signal transmitted for the first time may be the precoding reference signal transmitted for the first time.
  • the feedback information received for the first time may be the feedback information received for the first time.
  • the second precoding vector set may be, for example, a pre-configured precoding vector set.
  • one of the N I precoding vectors may be a weighted sum of N I-1 precoding vectors determined according to the feedback information from the terminal device received last time, and another N I -1
  • the precoding vectors can be taken from the second set of precoding vectors.
  • the N I-1 precoding vectors are the precoding vectors of the precoding reference signal generated by the network device for the I-1th transmission.
  • I can be greater than 1.
  • the second precoding vector set may be a pre-configured precoding vector set or an updated precoding vector set, for example. This is equivalent to repeating the process of updating the set of precoding vectors described above.
  • the updated first precoding vector set is converted into the second precoding vector set when the precoding reference signal is generated next time.
  • the network device may update the second set of precoding vectors again.
  • the above steps 210 to 240 can be repeated multiple times.
  • the precoding vector determined by the network device for precoding the reference signal is getting closer and closer to the direction of the terminal device, so that more accurate feedback from the terminal device can be obtained.
  • network equipment can also simultaneously transmit data with terminal equipment. For example, after the above steps 210 to 240 are repeatedly performed K times, the network device may determine the target precoding vector for data transmission based on the feedback information received for the Kth time.
  • the network device may select a precoding vector for precoding the reference signal based on a pre-configured precoding vector set (for example, referred to as the initial precoding vector set, that is, an example of the second precoding vector set) .
  • the initial precoding vector set includes precoding vectors b 1 , b 2 ,..., b T.
  • the network device may select N precoding vectors from the T precoding vectors to precode the reference signal sent for the first time, where N ⁇ T and both N and T are integers.
  • the network device selects the N precoding vectors b 1 , b 2 , ..., b N from the initial precoding vector set to precode the reference signal transmitted through the lth transmission layer, then the N precoding vectors
  • the coding vector can be denoted as b 1,l , b 2,l ,..., b N,l .
  • the network device sends the precoding reference signal through the first transmission layer.
  • the precoding reference signal generated by the network device based on the N precoding vectors b 1,l , b 2,l ,..., b N,l can be regarded as the first transmission by the network device through the lth transport layer Precoding reference signal.
  • the terminal device performs channel measurement based on the precoding reference signal received at the lth transmission layer, and feeds back the weights of the N precoding vectors as
  • the network device may determine, based on the weights of the N precoding vectors, that a precoding vector used for precoding the reference signal next time is
  • the network device may further select N-1 precoding vectors from the remaining TN precoding vectors in the initial precoding vector set (here, assume that TN ⁇ N-1), and the N-1 precoding vectors are respectively denoted as b N+1 , b N+2 ,..., b 2N-1 .
  • the N-1 precoding vectors are used to precode the reference signal transmitted through the lth transmission layer, they can be denoted as b N+1,l , b N+2,l ,..., b 2N- 1,l .
  • the N-1 precoding vectors and the above New N precoding vectors can be formed, which are used to precode the reference signal transmitted by the network device through the lth transmission layer. After precoding the reference signal, the network device sends the precoding reference signal through the first transmission layer.
  • the network equipment is based on the N precoding vectors
  • the precoding reference signal generated by b N+1,l , b N+2,l ,..., b 2N-1,l can be regarded as the precoding reference signal sent by the network device for the second time through the l transmission layer .
  • the network device can repeat the foregoing operations.
  • the precoding reference signal sent by the network device for the k+1th time may be based on And N-1 precoding vectors in the initial precoding vector b k(N-1)+2 , b k(N-1)+3 ,..., b (k+1)(N-1)+1 It is obtained by precoding the reference signal transmitted through the lth transmission layer.
  • the network device may also perform precoding on the reference signal transmitted through the lth transmission layer based on the N′ precoding vectors and the vector weighted based on the feedback information received last time.
  • the precoding reference signal sent this time can be understood as an example of the precoding reference signal sent for the first time described above.
  • the terminal device may perform channel measurement and send feedback information based on the precoding reference signal received on the lth transmission layer to indicate the weight of each precoding vector.
  • the feedback information sent by the terminal device this time can be understood as an example of the feedback information sent for the first time described above.
  • the network device may update the initial precoding vector to obtain the updated precoding vector set (ie, an example of the first precoding vector set described above). The specific process for the network device to update the precoding vector set has been described in detail above, and for brevity, it will not be repeated here.
  • the feedback of the terminal equipment for the first transmission layer is getting closer and closer to the direction of the terminal equipment, so it is used to precode the data transmitted by the first transmission layer.
  • the target precoding vector can also be better adapted to the channel.
  • the matrix formed by the above-mentioned initial precoding vector set is a unitary matrix.
  • ⁇ (0) [b 1 b 2 ... b T ]
  • ⁇ (0) is a unitary matrix.
  • the superscript (0) represents a precoding vector set that has not been updated, or in other words, a pre-configured precoding vector set.
  • the operation of the network device to precode the reference signal based on the initial precoding vector set is not limited to precoding the reference signal transmitted on one transport layer.
  • the reference signals transmitted through each transmission layer may be obtained based on different numbers and different precoding vectors.
  • the network device can first select multiple precoding vectors from the initial precoding vector set to perform the respective operations on the reference signal transmitted through the lth transmission layer and the reference signal transmitted through the zth transmission layer. Precoding.
  • the terminal device may perform channel measurement based on the precoding reference signal received on the lth transmission layer and the precoding reference signal received on the zth transmission layer, and send feedback information to the network device.
  • the network device can be based on the initial precoding vector set
  • These N l precoding vectors pre-code the reference signal transmitted through the l-th transmission layer, and the N l precoding vectors are denoted as
  • the weight of each precoding vector fed back by the terminal device based on the precoding reference signal received on the lth transmission layer for channel measurement is respectively
  • the network equipment can be based on the initial precoding vector set
  • These N z precoding vectors pre-encode the reference signal transmitted through the z-th transmission layer, and the N z precoding vectors are denoted as The weight of each precoding vector fed back by the terminal device based on the precoding reference signal received on the lth transmission layer for channel measurement is respectively
  • N l and N z may be the same or different. This application does not limit this.
  • the network device After receiving the weights of the precoding vectors fed back by the terminal device based on the lth transmission layer and the zth transmission layer, the network device can respectively determine the weighted sum of the precoding vectors determined based on different transmission layers, and then calculate the next time Precoding is performed through the reference signals transmitted by the lth transmission layer and the zth transmission layer.
  • the specific method for the network device to determine the precoding vector and precoding the reference signal based on each of the multiple transmission layers is the same as that described above for the first transmission layer to determine the precoding vector and precoding the reference signal The specific method is the same. For brevity, I won’t repeat it here.
  • the precoding reference signals respectively transmitted by the network equipment through the lth transmission layer and the zth transmission layer may be precoding reference signals sent to the same terminal device, or precoding reference signals sent to different terminal devices. . This application does not limit this.
  • the method further includes: step 250, the terminal device sends a precoding vector set reset instruction, where the precoding vector set reset instruction is used to instruct channel measurement based on the reset precoding vector set.
  • the network device receives the precoding vector set reset instruction.
  • the channel may change suddenly.
  • the terminal device can determine whether it is necessary to reset the precoding vector set according to its own movement situation or the difference change between the two measurement results.
  • the terminal device may suggest that the network device update the precoding vector set by sending the precoding vector set reset indication to the network device.
  • the network device may also comprehensively consider whether to update the precoding vector set based on more factors.
  • step 260 the network device determines a target precoding vector for data transmission according to the feedback information received for the Kth time; and precoding the downlink data based on the target precoding vector to obtain precoded data.
  • the target precoding vector used for data transmission may be a precoding vector corresponding to the transmission layer. That is, the precoding vector used to precode the data when transmitting data through a certain transport layer. For example, the precoding vector used to precode the data when the data is transmitted through the first transmission layer.
  • the network device can determine the target precoding vector according to the feedback information received at the Kth time.
  • the network device passes N precoding vectors b (K-1)(N-1)+2 , b (K-1)(N-1)+3 ,..., b K(N-1)+1 pair passes through the lth transport layer for the Kth time.
  • the transmitted reference signal is pre-coded, and the weight of each pre-coding vector fed back by the terminal device for the Kth time is respectively ⁇ (K-1)(N-1)+2 , ⁇ (K-1)(N-1)+3 , whil, ⁇ K(N-1)+1 , then it can be determined to be used for the lth Target precoding vector for precoding data on the transport layer among them, Represents the weighted sum of the precoding vector determined based on the previous feedback (that is, the K-1th) feedback, Indicates what is indicated in the feedback message received at the Kth time the weight of.
  • the precoding vectors and their weights listed above are only examples and should not constitute any limitation to this application. It should also be understood that the network device is not limited to sending downlink data to the same terminal device through one transport layer. When a network device sends downlink data to the same terminal device through multiple transmission layers, it may precode the data transmitted on the corresponding transmission layer based on the target precoding vector corresponding to each transmission layer.
  • the target precoding vector listed above shows an example of the target precoding vector determined based on multiple feedbacks of the terminal device, that is, an example of K>1.
  • the network device may also determine the target precoding vector for data transmission based on a feedback from the terminal device.
  • N precoding vectors are used to precode reference signals transmitted through one or more transmission layers, and the N precoding vectors b 1 , b 2 , ..., fed back for the lth transmission layer, The weights of b N feedback are Then the target precoding vector used to precode the data on the lth transmission layer can be determined
  • J of the L transmission layers are used to transmit data with the terminal device.
  • the J transmission layers may include, for example, the above-mentioned first transmission layer and J-1 transmission layers other than the first transmission layer.
  • J ⁇ Z and J is a positive integer.
  • the network device can send data to the same terminal device through some or all of the L transport layers.
  • the number of transmission layers used to transmit data is J
  • the target precoding vector used for precoding data on any one of the J transmission layers can be determined by the method described above.
  • the method further includes: the network device determines a target precoding vector used for data transmission at the jth transmission layer based on the feedback information received K times.
  • the j-th transport layer is any one of the J-1 transport layers except the j-th transport layer among the aforementioned J transport layers.
  • the feedback information received for the kth time among the feedback information received for K times is used to indicate The weight of each precoding vector.
  • the A precoding vector is a precoding vector used for precoding the reference signal sent through the jth transmission layer for the kth time, or in other words, used to generate the precoding reference signal sent through the kth time of the jth transmission layer
  • the precoding vector is One precoding vector among the precoding vectors.
  • the A precoding vector is used to precode the reference signal sent through the jth transmission layer for the k+1th time, or in other words, used to generate the precoding vector sent through the jth transmission layer for the k+1th time Precoding vector of the precoding reference signal.
  • 1 ⁇ j ⁇ J-1, and j can take any value from 1 to J-1.
  • the terminal device can feed back the precoding reference signals corresponding to the precoding reference signals transmitted on each transmission layer through the same feedback information.
  • the weight of the encoding vector It is just that the precoding vectors corresponding to the precoding reference signals transmitted through different transmission layers may be different, and the number of corresponding precoding vectors may also be different. To facilitate the distinction, the superscripts (j) and (l) are used to distinguish different transmission layers among the M transmission layers.
  • the number of transmission layers measured during the channel measurement of the network device is not equal to the number of transmission layers used for data transmission.
  • the network device can schedule some or all of the transmission layers according to the number of transmission layers determined by the channel measurement for data transmission.
  • the target precoding vector is a precoding vector corresponding to a transmission layer.
  • the target precoding vector can be used to precode the data transmitted through the transmission layer.
  • the network device can determine the target precoding vector corresponding to the multiple transmission layers, and the network device can pair the data transmitted through this transmission layer based on the precoding vector corresponding to each transmission layer.
  • the data is pre-coded, and the pre-coded data is obtained.
  • the network device may also determine a precoding matrix according to the target precoding vectors respectively corresponding to multiple transmission layers, so as to precode the data to be transmitted, so as to obtain precoded data.
  • the network equipment can separately precode the reference signals of each transmission layer based on different precoding vectors, and the terminal equipment can also perform channel measurement separately based on the precoding reference signals received on different transmission layers, and then determine the relationship with each transmission layer.
  • the weight of each precoding vector corresponding to the transmission layer can also determine the target precoding vector corresponding to each transmission layer based on the weight of each precoding vector fed back by the terminal device for each transmission layer. For example, p (1) and p (2) shown above.
  • the network device may precode the reference signal based on multiple precoding vectors, and the terminal device may also perform channel measurement based on the received precoding reference signal to determine the weight of each precoding vector.
  • the terminal device can determine the number of transmission layers according to the channel matrix, and then determine the observation value based on the observation matrix corresponding to the number of transmission layers, and then determine the weight of each precoding vector in different transmission layers.
  • the network device may determine the target precoding vector corresponding to each transmission layer based on the weight of each precoding vector fed back by the terminal device for each transmission layer, such as the p l shown above.
  • the network device may also construct a precoding matrix based on the weight of each precoding vector fed back by the terminal device for each transmission layer, for example, construct a precoding matrix from p 1 to p L.
  • the specific manner in which the network device determines the target precoding vector based on the feedback information sent by the terminal device is not limited to those listed above. This application does not limit the specific manner in which the network device determines the target precoding vector.
  • step 270 the network device sends the precoded data.
  • step 270 the terminal device receives precoded data.
  • PDSCH Physical Downlink Share Channel
  • Fig. 2 is only an example, showing the process of sending downlink data after the operations of step 210 to step 240 are repeatedly performed K times.
  • K times are only examples and should not constitute any limitation to this application.
  • This application does not limit the time when the network device sends the downlink data. In other words, the present application does not limit the execution sequence of step 210 to step 240 and step 260 to step 270.
  • the terminal device can perform channel measurement and feedback based on the precoding reference signal sent multiple times by the network device.
  • the precoding vector used by the precoding reference signal sent by the network device each time refers to the information fed back by the terminal device in the previous time, so it can get closer and closer to the direction of the terminal device, so that the feedback obtained from the terminal device is more accurate.
  • the network device can determine the precoding vector used to precode the data based on the latest feedback of the terminal device, and the determined precoding vector can be considered as the one closest to the direction of the terminal device in the currently obtained channel measurement results. The precoding vector is therefore helpful to improve data transmission performance.
  • Fig. 3 is a schematic block diagram of a communication device provided by an embodiment of the present application.
  • the communication device 1000 may include a processing unit 1100 and a transceiver unit 1200.
  • the communication device 1000 may correspond to the terminal device in the above method embodiment, for example, it may be a terminal device or a chip configured in the terminal device.
  • the communication device 1000 may correspond to the terminal device in the method 200 according to the embodiment of the present application, and the communication device 1000 may include a unit for executing the method executed by the terminal device in the method 200 in FIG. 2.
  • each unit in the communication device 1000 and other operations and/or functions described above are used to implement the corresponding process of the method 200 in FIG. 2.
  • the processing unit 1100 can be used to perform step 220 in the method 200
  • the transceiver unit 1200 can be used to perform step 210, step 230, step 250, and step 250 in the method 200.
  • Step 270 It should be understood that the specific process for each unit to execute the foregoing corresponding steps has been described in detail in the foregoing method embodiment, and is not repeated here for brevity.
  • the transceiver unit 1200 in the communication device 1000 may correspond to the transceiver 2020 in the terminal device 2000 shown in FIG. 4, and the processing unit 1100 in the communication device 1000 may It corresponds to the processor 2010 in the terminal device 2000 shown in FIG. 4.
  • the transceiver unit 1200 in the communication device 1000 may be an input/output interface.
  • the communication device 1000 may correspond to the network device in the above method embodiment, for example, it may be a network device or a chip configured in the network device.
  • the communication device 1000 may correspond to the network device in the method 200 according to the embodiment of the present application, and the communication device 1000 may include a unit for executing the method executed by the network device in the method 200 in FIG. 2.
  • each unit in the communication device 1000 and other operations and/or functions described above are used to implement the corresponding process of the method 200 in FIG. 2.
  • the processing unit 1100 can be used to execute steps 240 and 260 in the method 200, and the transceiver unit 1200 can be used to execute steps 210, 230, and 200 in the method 200. Step 250 and step 270. It should be understood that the specific process for each unit to execute the foregoing corresponding steps has been described in detail in the foregoing method embodiment, and is not repeated here for brevity.
  • the transceiver unit in the communication device 1000 may correspond to the transceiver 3200 in the network device 3000 shown in FIG. 5, and the processing unit 1100 in the communication device 1000 may It corresponds to the processor 3100 in the network device 3000 shown in FIG. 5.
  • the transceiver unit 1200 in the communication device 1000 may be an input/output interface.
  • FIG. 4 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 foregoing method embodiment.
  • 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 2020, and the memory 2030 can communicate with each other through internal connection paths to transfer control and/or data signals.
  • the memory 2030 is used for storing computer programs, and the processor 2010 is used for downloading 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 transmitting the uplink data or uplink control signaling output by the transceiver 2020 through a wireless signal.
  • the aforementioned processor 2010 and the memory 2030 can be combined into a processing device, and the processor 2010 is configured to execute the program code stored in the memory 2030 to implement the aforementioned 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 1100 in FIG. 3.
  • the aforementioned transceiver 2020 may correspond to the transceiver unit 1200 in FIG. 3, and may also be referred to as a transceiver unit.
  • the transceiver 2020 may include a receiver (or called receiver, receiving circuit) and a transmitter (or called 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. 4 can implement various processes involving the terminal device in the method embodiment shown in FIG. 2.
  • the operations and/or functions of each module in the terminal device 2000 are respectively for implementing the corresponding processes in the foregoing method embodiments.
  • the above-mentioned processor 2010 can be used to execute the actions described in the previous method embodiments implemented by the terminal device, and the transceiver 2020 can be used to execute the terminal device described in the previous method embodiments to send or receive from the network device action.
  • the transceiver 2020 can be used to execute the terminal device described in the previous method embodiments to send or receive from the network device action.
  • the aforementioned terminal device 2000 may further include a power supply 2050 for providing power to various devices or circuits in the terminal device.
  • the terminal device 2000 may also include one or more of an input unit 2060, a display unit 2070, an audio circuit 2080, a camera 2090, and a sensor 2100.
  • the audio circuit A speaker 2082, a microphone 2084, etc. may also be included.
  • FIG. 5 is a schematic structural diagram of a network device provided by an embodiment of the present application, for example, it 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 foregoing method embodiment.
  • 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 known as distributed unit (DU) )) 3200.
  • RRU 3100 may be referred to as a transceiver unit, which corresponds to the transceiver unit 1100 in FIG. 3.
  • the transceiver unit 3100 may also be called a transceiver, a transceiver circuit, or a transceiver, etc., and it may include at least one antenna 3101 and a radio frequency unit 3102.
  • the transceiver 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 or transmitting circuit).
  • the RRU 3100 part is mainly used for sending and receiving of radio frequency signals and conversion of radio frequency signals and baseband signals, for example, for sending instruction information to terminal equipment.
  • the 3200 part of the BBU is mainly used for baseband processing and control of the base station.
  • the RRU 3100 and the BBU 3200 may be physically set together, or may be physically separated, that is, a distributed base station.
  • the BBU 3200 is the control center of the base station, and may also be called a processing unit, which may correspond to the processing unit 1200 in FIG. 3, and is mainly used to complete baseband processing functions, such as channel coding, multiplexing, modulation, and spreading.
  • the BBU processing unit
  • the BBU may be used to control the base station to execute the operation procedure of the network device in the foregoing method embodiment, for example, to generate the foregoing indication information.
  • the BBU 3200 may be composed of one or more single boards, and multiple single boards may jointly support a radio access network with a single access standard (such as an LTE network), or support different access standards. 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 configured to control the base station to perform necessary actions, for example, to control the base station to execute the operation procedure 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 can also be that multiple boards share the same memory and processor. In addition, necessary circuits can be provided on each board.
  • the base station 3000 shown in FIG. 5 can implement various processes involving network devices in the method embodiment shown in FIG. 2.
  • the operations and/or functions of the various modules in the base station 3000 are used to implement the corresponding procedures in the foregoing method embodiments.
  • the above-mentioned BBU 3200 can be used to perform the actions described in the previous method embodiments implemented by the network device, and the RRU 3100 can be used to perform the actions described in the previous method embodiments that the network device sends to or receives from the terminal device.
  • the RRU 3100 can be used to perform the actions described in the previous method embodiments that the network device sends to or receives from the terminal device.
  • the base station 3000 shown in FIG. 5 is only a possible architecture of the network device, and should not constitute any limitation in this application.
  • the method provided in this application can be applied to network devices of other architectures.
  • network equipment including CU, DU, and active antenna unit (AAU). This application does not limit the specific architecture of the network device.
  • An embodiment of the present application also provides a processing device, including a processor and an interface; the processor is configured to execute the method in any of the foregoing method embodiments.
  • the aforementioned processing device may be one or more chips.
  • the processing device may be a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), or a system on chip (SoC), or It is a central processor unit (CPU), it can also be a network processor (NP), it can also be a digital signal processing circuit (digital signal processor, DSP), or it can be a microcontroller (microcontroller unit). , MCU), it can also be a programmable logic device (PLD) or other integrated chips.
  • FPGA field programmable gate array
  • ASIC application specific integrated circuit
  • SoC system on chip
  • CPU central processor unit
  • NP network processor
  • DSP digital signal processing circuit
  • microcontroller unit microcontroller unit
  • MCU programmable logic device
  • PLD programmable logic device
  • the steps of the above method can be completed by hardware integrated logic circuits in the processor or instructions in the form of software.
  • the steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed and completed by a hardware processor, or executed and completed by a combination of hardware and software modules in the processor.
  • the software module can be located in a mature storage medium in the field such as random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, registers.
  • 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. To avoid repetition, it will not be described in detail here.
  • the processor in the embodiment of the present application may be an integrated circuit chip with signal processing capability.
  • the steps of the foregoing method embodiments can be completed by hardware integrated logic circuits in the processor or instructions in the form of software.
  • the above-mentioned 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 can be implemented or executed.
  • the general-purpose processor may be a microprocessor or the processor may also be any conventional processor or the like.
  • the steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed and completed by a hardware decoding processor, or executed and completed by a combination of hardware and software modules in the decoding processor.
  • the software module can be located in a mature storage medium in the field such as random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, registers.
  • 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 embodiment of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory.
  • the non-volatile memory can be read-only memory (ROM), programmable read-only memory (programmable ROM, PROM), erasable programmable read-only memory (erasable PROM, EPROM), and electronic Erase programmable read-only memory (electrically EPROM, EEPROM) or flash memory.
  • the volatile memory may be random access memory (RAM), which is used as an external cache.
  • RAM random access memory
  • static random access memory static random access memory
  • dynamic RAM dynamic random access memory
  • DRAM dynamic random access memory
  • SDRAM synchronous dynamic random access memory
  • double data rate synchronous dynamic random access memory double data rate 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 a computer, the computer executes the embodiment shown in FIG. 2 Method in.
  • the present application also provides a computer-readable medium storing program code, which when the program code runs on a computer, causes the computer to execute the embodiment shown in FIG. 2 Method in.
  • the present application also provides a system, which includes the aforementioned one or more terminal devices and one or more network devices.
  • the network equipment in the above-mentioned device embodiments completely corresponds to the network equipment or terminal equipment in the terminal equipment and method embodiments, and the corresponding modules or units execute the corresponding steps.
  • the communication unit transmits the receiving or In the sending step, other steps except sending and receiving can be executed by the processing unit (processor).
  • the processing unit processor
  • component used in this specification are used to denote computer-related entities, hardware, firmware, a combination of hardware and software, software, or software in execution.
  • the component may be, but is not limited to, a process, a processor, an object, an executable file, an execution thread, a program, and/or a computer running on a processor.
  • the application running on the computing device and the computing device can be components.
  • One or more components may reside in processes and/or threads of execution, and components may be located on one computer and/or distributed among two or more computers.
  • these components can be executed from various computer readable media having various data structures stored thereon.
  • the component may be based on, for example, a signal having one or more data packets (such as data from two components interacting with another component in 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.
  • a signal having one or more data packets (such as data from two components interacting with another component in 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.
  • the disclosed system, device, and method may be implemented in other ways.
  • the device embodiments described above are only illustrative.
  • the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components can be combined or It 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 they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.
  • each 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 by software, it can be implemented in the form of a computer program product in whole or in part.
  • the computer program product includes one or more computer instructions (programs).
  • programs When the computer program instructions (programs) are loaded and executed on the computer, the processes or functions described in the embodiments of the present application are generated in whole or in part.
  • the computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices.
  • the computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium.
  • the computer instructions may be transmitted from a website, 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 such as a server or a data center integrated with one or more available media.
  • the usable medium may be a magnetic medium, (for example, a floppy disk, a hard disk, and a magnetic tape), an optical medium (for example, a high-density digital video disc (digital video disc, DVD)), or a semiconductor medium (for example, a solid state disk, SSD)) etc.
  • a magnetic medium for example, a floppy disk, a hard disk, and a magnetic tape
  • an optical medium for example, a high-density digital video disc (digital video disc, DVD)
  • a semiconductor medium for example, a solid state disk, SSD
  • 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 this application essentially or the part that contributes to the existing technology or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the method described in each embodiment of the present application.
  • the aforementioned storage media include: U disk, mobile hard disk, read-only memory (read-only memory, ROM), random access memory (random access memory, RAM), magnetic disk or optical disk and other media that can store program code .

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radio Transmission System (AREA)

Abstract

La présente invention concerne un procédé de mesure de canal et un appareil de communication. Le procédé comprend les étapes suivantes : la détermination par un dispositif de réseau, sur la base d'informations de rétroaction reçues K fois, d'un vecteur de précodage cible pour une transmission de données ; et le précodage des données selon le vecteur de précodage cible, et l'envoi des données précodées. Les informations de rétroaction reçues K fois sont déterminées sur la base de signaux de référence de précodage envoyés K fois, les informations de rétroaction reçues à la kième fois sont utilisées pour indiquer des poids de Nk vecteurs de précodage, et une somme pondérée des Nk vecteurs de précodage est l'un de Nk+1 vecteurs de précodage ; et les Nk vecteurs de précodage sont des vecteurs de précodage pour générer un signal de référence de précodage envoyé à la kième fois, et les Nk+1 vecteurs de précodage sont des vecteurs de précodage pour générer un signal de référence de précodage envoyé à la (k +1)ième fois. Au moyen d'une mesure de canal et d'une rétroaction effectuées plusieurs fois, un vecteur de précodage pour la transmission de données qui est déterminé par un dispositif de réseau devient de plus en plus proche de la direction d'un dispositif terminal, ce qui facilite l'amélioration des performances de transmission de données.
PCT/CN2020/083497 2019-04-16 2020-04-07 Procédé de mesure de canal et appareil de communication WO2020211681A1 (fr)

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