WO2021146938A1 - Procédé et appareil de détermination d'informations d'état de canal de liaison descendante - Google Patents

Procédé et appareil de détermination d'informations d'état de canal de liaison descendante Download PDF

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Publication number
WO2021146938A1
WO2021146938A1 PCT/CN2020/073577 CN2020073577W WO2021146938A1 WO 2021146938 A1 WO2021146938 A1 WO 2021146938A1 CN 2020073577 W CN2020073577 W CN 2020073577W WO 2021146938 A1 WO2021146938 A1 WO 2021146938A1
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weighting coefficient
coefficient matrix
matrix
timing deviation
terminal device
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PCT/CN2020/073577
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English (en)
Chinese (zh)
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袁一凌
葛士斌
金黄平
范利
毕晓艳
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华为技术有限公司
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Priority to PCT/CN2020/073577 priority Critical patent/WO2021146938A1/fr
Publication of WO2021146938A1 publication Critical patent/WO2021146938A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management

Definitions

  • This application relates to the field of communications, and more specifically, to a method and device for determining downlink channel state information (CSI).
  • CSI downlink channel state information
  • the 5th Generation (5G) system needs to have higher performance and efficiency than 4G, and has higher requirements on system capacity and spectrum efficiency.
  • the massive-input multiple-output (MIMO) system is a key technology in the 5G communication system.
  • a large number of antennas are arranged on the network equipment side, so that the 5G network can double the system throughput.
  • how to learn uplink CSI and downlink CSI is an important parameter to improve the communication quality of MIMO communication.
  • TDD time division duplex
  • the uplink channel and the downlink channel have strict reciprocity, and the network equipment can learn the downlink CSI through the uplink CSI.
  • the network device can reconstruct the downlink CSI based on the prior information of the uplink channel (that is, the multipath angle and delay) and the supplementary information fed back by the terminal device. Specifically, the network device generates precoding according to the angle and time delay, and uses the precoding to encode the downlink signal.
  • the terminal device receives the coded downlink signal, and generates a weighting coefficient according to the coded downlink signal.
  • the network receives the weighting coefficient, and determines the downlink CSI according to the weighting coefficient and combining the multipath angle and time delay.
  • the present application provides a method and device for determining downlink status information CSI, which can obtain accurate downlink CSI, thereby improving the communication quality of downlink signal transmission.
  • a method for determining downlink status information CSI includes: selecting a weighting coefficient matrix with the largest norm from a plurality of weighting coefficient matrices as a target weighting coefficient matrix, and the target weighting coefficient matrix is used for The network device determines the downlink CSI; and sends the target weighting coefficient matrix to the network device.
  • the terminal device determines the weighting coefficient whose norm takes the maximum value as the target weighting coefficient, and sends it to the network device. That is to say, the terminal device uses the weighting coefficient matrix with the largest energy to restore the downlink channel, so that the network device can obtain more accurate downlink CSI and help improve the communication quality of the downlink signal transmission.
  • the method before selecting the weighting coefficient matrix with the largest norm from the multiple weighting coefficient matrices as the target weighting coefficient matrix, the method further includes: according to the first timing deviation within the value range of the timing deviation Value, the first weighting coefficient matrix among the multiple weighting coefficient matrices is determined.
  • the terminal device may calculate the weighting coefficient matrix according to the timing deviation, that is, different timing deviations correspond to different weighting coefficient matrices.
  • the terminal device can determine the weighting coefficient matrix corresponding to different timing deviation values according to the value range of the timing deviation, and then select the target weighting coefficient matrix from the weighting coefficient matrix corresponding to the different timing deviation values, thereby helping To improve the accuracy of determining the downlink CSI.
  • the determining the first weighting coefficient of the multiple weighting coefficients according to the first timing deviation value within the timing deviation range includes: determining the first compensation phase according to the first timing deviation value; The first compensation phase determines the first weighting coefficient matrix.
  • the compensation phase determined by the terminal equipment according to the timing deviation value can be Among them, f k represents the frequency of the k-th subband, and ⁇ is the timing deviation value. Or the compensation phase determined by the terminal device according to the timing deviation value may be e 2 ⁇ jk ⁇ f ⁇ , where ⁇ f represents the bandwidth of the subband, and ⁇ is the timing deviation value.
  • c n represents the nth column in the first weighting coefficient matrix
  • n is any one of 1, 2, ..., N
  • For the compensation phase Indicates the channel value of the nth receiving antenna and the kth subband, Represents the precoding weight vector on the p-th port and the k-th subband of the network device.
  • the terminal device determining the weighting coefficient according to the compensation phase may specifically be that the compensation phase and the nth column in the first weighting coefficient matrix satisfy the following formula:
  • c n represents the nth column of the first weighting coefficient matrix
  • n is any one of 1, 2, ..., N
  • e 2 ⁇ jk ⁇ f ⁇ is the compensation phase
  • the method further includes: receiving indication information from the network device, where the indication information is used to indicate the value range of the timing deviation.
  • the network device can set the value range of the timing deviation and inform the terminal device through instruction information. In this way, the terminal device can determine the corresponding weighting coefficient matrix according to the timing deviation value within the timing deviation value range, thereby selecting the target weighting coefficient matrix, which helps to further improve the accuracy of determining the downlink CSI.
  • selecting the weighting coefficient matrix with the largest norm from the multiple weighting coefficient matrices as the target weighting coefficient matrix includes: the target weighting coefficient matrix and the multiple weighting coefficient matrices satisfy the following formula:
  • a method for determining downlink channel state information CSI includes: receiving a target weighting coefficient matrix, where the target weighting coefficient matrix is a weighting coefficient with the largest norm among a plurality of weighting coefficient matrices for a terminal device.
  • Matrix Determine the downlink CSI according to the target weighting coefficient matrix.
  • the terminal device determines the weighting coefficient whose norm takes the maximum value as the target weighting coefficient, and sends it to the network device.
  • the terminal device uses the weighting coefficient matrix with the largest energy to determine the downlink CSI (that is, to restore the downlink channel), so that the network device can obtain more accurate downlink CSI and help improve the communication quality of downlink signal transmission.
  • the method further includes: sending instruction information to the terminal device, the instruction information is used to indicate a value range of the timing deviation, and the timing deviation value within the value range of the timing deviation is used for the terminal device to determine Each weighting coefficient matrix in the plurality of weighting coefficient matrices.
  • the network device can set the value range of the timing deviation and inform the terminal device through instruction information. In this way, the terminal device can determine the corresponding weighting coefficient matrix according to the timing deviation value within the timing deviation value range, thereby selecting the target weighting coefficient matrix, which helps to further improve the accuracy of determining the downlink CSI.
  • a device for determining downlink channel state information CSI may be a terminal device or a chip for a terminal device, such as a chip that can be set in the terminal device.
  • the device has the function of realizing the above-mentioned first aspect and various possible implementation manners. This function can be realized by hardware, or by hardware executing corresponding software.
  • the hardware or software includes one or more modules corresponding to the above-mentioned functions.
  • the device includes: a processing module and a transceiver module.
  • the transceiver module may be, for example, at least one of a transceiver, a receiver, and a transmitter.
  • the transceiver module may include a receiving module and a transmitting module.
  • the ground can include a radio frequency circuit or an antenna.
  • the processing module may be a processor.
  • the device further includes a storage module, and the storage module may be a memory, for example. When a storage module is included, the storage module is used to store instructions.
  • the processing module is connected to the storage module, and the processing module can execute the instructions stored in the storage module or from other instructions, so that the device executes the above-mentioned first aspect and various possible implementation modes of communication methods.
  • the device can be a terminal device.
  • the chip when the device is a chip, the chip includes: a processing module and a transceiver module.
  • the transceiver module may be, for example, an input/output interface, pin, or circuit on the chip.
  • the processing module may be a processor, for example.
  • the processing module can execute instructions so that the chip in the terminal device executes the foregoing and any possible implementation communication methods.
  • the processing module may execute instructions in the storage module, and the storage module may be a storage module in the chip, such as a register, a cache, and the like.
  • the storage module can also be located in the communication device but outside the chip, such as read-only memory (ROM) or other types of static storage devices that can store static information and instructions, random access memory (random access memory) memory, RAM) etc.
  • ROM read-only memory
  • RAM random access memory
  • the processor mentioned in any of the above can be a general-purpose central processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more for controlling the above The first aspect, as well as any possible implementation of the method of program execution integrated circuit.
  • CPU central processing unit
  • ASIC application-specific integrated circuit
  • a device for determining downlink channel state information CSI may be a network device or a chip for a network device, such as a chip that can be set in a network device.
  • the device has the function of realizing the above-mentioned second aspect and various possible implementation modes. This function can be realized by hardware, or by hardware executing corresponding software.
  • the hardware or software includes one or more modules corresponding to the above-mentioned functions.
  • the device includes: a transceiver module and a processing module.
  • the transceiver module may be, for example, at least one of a transceiver, a receiver, and a transmitter.
  • the transceiver module may include a receiving module and a transmitting module. Specifically, it may include a radio frequency circuit or an antenna.
  • the processing module may be a processor.
  • the device further includes a storage module, and the storage module may be a memory, for example.
  • the storage module is used to store instructions.
  • the processing module is connected to the storage module, and the processing module can execute instructions stored in the storage module or instructions derived from other sources, so that the device executes the above-mentioned second aspect or any one of the methods thereof.
  • the chip when the device is a chip, the chip includes a transceiver module and a processing module.
  • the transceiver module may be, for example, an input/output interface, pin, or circuit on the chip.
  • the processing module may be a processor, for example. The processing module can execute instructions so that the chip in the network device executes the second aspect described above and any possible implemented communication method.
  • the processing module may execute instructions in the storage module, and the storage module may be a storage module in the chip, such as a register, a cache, and the like.
  • the storage module can also be located in the communication device but outside the chip, such as read-only memory (ROM) or other types of static storage devices that can store static information and instructions, random access memory (random access memory) memory, RAM) etc.
  • ROM read-only memory
  • RAM random access memory
  • the processor mentioned in any of the above can be a general-purpose central processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more for controlling the above
  • the method of the second aspect is an integrated circuit for program execution.
  • a device including a module for implementing the method described in the first aspect and any possible implementation manners thereof.
  • a device including a module for implementing the method described in the second aspect and any possible implementation manners thereof.
  • a device including a processor, configured to call a program stored in a memory to execute the method described in the first aspect and any possible implementation manners thereof.
  • an apparatus including a processor, configured to call a program stored in a memory to execute the method described in the second aspect and any possible implementation manners thereof.
  • a device including: a processor and an interface circuit, the processor is configured to communicate with other devices through the interface circuit, and execute the first aspect of the claim, and any possible implementation manners thereof The described method.
  • a device including: a processor and an interface circuit, the processor is configured to communicate with other devices through the interface circuit, and execute the second aspect of the claim, and any possible implementation manners thereof The described method.
  • a terminal device including any one of the fifth aspect, the seventh aspect, or the ninth aspect, and the device described in any possible implementation manner thereof.
  • a network device including any one of the sixth aspect, the eighth aspect, or the tenth aspect, and the device described in any possible implementation manners thereof.
  • a computer storage medium stores instructions, and when the instructions are executed, the method as described in the first aspect of the claim and any possible implementation manners thereof is implemented .
  • a computer storage medium stores instructions, and when the instructions are executed, the method as described in the second aspect of the claim and any possible implementation manners thereof is implemented .
  • a computer storage medium stores program code, and the program code is used to instruct instructions to execute the method in the first aspect and any possible implementations thereof.
  • a computer storage medium stores program code, and the program code is used to instruct instructions to execute the method in the second aspect and any possible implementations thereof.
  • a computer program product containing instructions which when running on a processor, causes a computer to execute the method in the first aspect described above, or any possible implementation manner thereof.
  • a computer program product containing instructions which when running on a processor, causes a computer to execute the method in the second aspect described above, or any possible implementation manner thereof.
  • a communication system in a nineteenth aspect, includes a device capable of implementing the methods and various possible designs of the above-mentioned first aspect, and the above-mentioned device capable of implementing the various methods and various possible designs of the above-mentioned second aspect. The function of the device.
  • the terminal device determines the weighting coefficient whose norm takes the maximum value as the target weighting coefficient, and sends it to the network device. That is to say, the terminal device uses the weighting coefficient matrix with the largest energy to restore the downlink channel, so that the network device can obtain more accurate downlink CSI and help improve the communication quality of the downlink signal transmission.
  • FIG. 1 is a schematic diagram of the architecture of a communication system applicable to an embodiment of the present application
  • FIG. 2 is a schematic diagram of precoding a reference signal based on a delay vector according to an embodiment of the present application
  • FIG. 3 is a schematic flowchart of a method for determining downlink channel state information CSI according to an embodiment of the present application
  • FIG. 4 is a schematic block diagram of an apparatus for determining downlink channel state information CSI according to an embodiment of the present application
  • FIG. 5 is a schematic structural diagram of an apparatus for determining downlink channel state information CSI according to an embodiment of the present application
  • FIG. 6 is a schematic block diagram of an apparatus for determining downlink channel state information CSI according to another embodiment of the present application.
  • FIG. 7 is a schematic structural diagram of an apparatus for determining downlink channel state information CSI according to an embodiment of the present application.
  • FIG. 8 is a schematic structural diagram of an apparatus for determining downlink channel state information CSI according to an embodiment of the present application.
  • FIG. 9 is a schematic structural diagram of an apparatus for determining downlink channel state information CSI according to another embodiment of the present application.
  • FIG. 10 is a schematic structural diagram of an apparatus for determining downlink channel state information CSI according to another embodiment of the present application.
  • FIG. 11 is a schematic structural diagram of an apparatus for determining downlink channel state information CSI according to another embodiment of the present application.
  • LTE Long Term Evolution
  • FDD frequency division duplex
  • TDD Time division duplex
  • UMTS Universal Mobile Telecommunication System
  • WiMAX Worldwide Interoperability for Microwave Access
  • 5G mobile communication system may include non-standalone (NSA) and/or standalone (SA).
  • the technical solution provided in this application can also be applied to machine type communication (MTC), inter-machine communication long-term evolution technology (Long Term Evolution-machine, LTE-M), and device-to-device (D2D) Network, machine to machine (M2M) network, Internet of things (IoT) network or other networks.
  • MTC machine type communication
  • LTE-M inter-machine communication long-term evolution technology
  • D2D device-to-device
  • M2M machine to machine
  • IoT Internet of things
  • the IoT network may include, for example, the Internet of Vehicles.
  • V2X vehicle to other devices
  • V2X vehicle to X
  • X can represent anything
  • the V2X may include: vehicle to vehicle (V2V) communication, and the Infrastructure (vehicle to infrastructure, V2I) communication, vehicle to pedestrian communication (V2P) or vehicle to network (V2N) communication, etc.
  • V2V vehicle to vehicle
  • V2I vehicle to infrastructure
  • V2P vehicle to pedestrian communication
  • V2N vehicle to network
  • the network device may be any device that has a wireless transceiver function.
  • This equipment includes but is not limited to: evolved Node B (eNB), radio network controller (RNC), Node B (NB), base station controller (BSC) , Base transceiver station (BTS), home base station (for example, home evolved NodeB, or home Node B, HNB), baseband unit (BBU), wireless fidelity (wireless fidelity, WiFi) system Access point (AP), wireless relay node, wireless backhaul node, transmission point (TP), or transmission and reception point (TRP), etc.
  • eNB evolved Node B
  • RNC radio network controller
  • NB Node B
  • BSC base station controller
  • BBU Base transceiver station
  • home base station for example, home evolved NodeB, or home Node B, HNB
  • BBU baseband unit
  • wireless fidelity wireless fidelity, WiFi
  • AP wireless relay node
  • TP transmission point
  • TRP transmission and reception point
  • the gNB may include a centralized unit (CU) and a DU.
  • the gNB may also include an active antenna unit (AAU).
  • CU implements some functions of gNB, and 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 implements the functions of the radio link control (RLC) layer, medium access control (MAC) layer, and physical (physical, PHY) layer.
  • RLC radio link control
  • MAC medium access control
  • PHY physical layer
  • 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), and the CU can also be divided into network equipment in a core network (core network, CN), which is not limited in this application.
  • the network equipment provides services for the cell, and the terminal equipment communicates with the cell through the transmission resources (for example, frequency domain resources, or spectrum resources) allocated by the network equipment.
  • the cell may belong to a macro base station (for example, a macro eNB or a macro gNB, etc.) , It may also belong to the base station corresponding to the small cell, where the small cell may include: metro cell, micro cell, pico cell, femto cell, etc. These small cells have the characteristics of small coverage area and low transmit power, and are suitable for providing high-speed data transmission services.
  • terminal equipment may also be referred to as user equipment (UE), access terminal equipment, subscriber unit, user station, mobile station, mobile station, remote station, remote terminal equipment, mobile equipment, user Terminal equipment, terminal equipment, wireless communication equipment, user agent or user device.
  • UE user equipment
  • access terminal equipment subscriber unit
  • user station mobile station
  • mobile station mobile station
  • remote station remote terminal equipment
  • mobile equipment user Terminal equipment
  • terminal equipment wireless communication equipment
  • user agent user device
  • the terminal device may be a device that provides voice/data connectivity to the user, for example, a handheld device with a wireless connection function, a vehicle-mounted device, and so on.
  • some terminal devices can be: mobile phones, tablets, computers with wireless transceiver functions (such as laptops, palmtops, etc.), mobile internet devices (MID), virtual Virtual reality (VR) equipment, augmented reality (AR) equipment, wireless terminal equipment in industrial control, wireless terminal equipment in self-driving (self-driving), remote medical (remote medical) Wireless terminal equipment in the smart grid, wireless terminal equipment in the smart grid, wireless terminal equipment in transportation safety, wireless terminal equipment in the smart city, and smart home Wireless terminal equipment, cellular phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants (PDAs), with wireless communication functions Handheld devices, computing devices or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, terminal devices in the 5G network or terminal devices in the public land mobile
  • wearable devices can also be called wearable smart devices, which are the general term for using wearable technology to intelligently design daily wear and develop wearable devices, such as glasses, gloves, watches, clothing and shoes.
  • a wearable device is a portable device that is directly worn on the body or integrated into the user's clothes or accessories.
  • Wearable devices are not only a kind of hardware device, but also realize powerful functions through software support, data interaction, and cloud interaction.
  • wearable smart devices include full-featured, large-sized, complete or partial functions that can be achieved without relying on smart phones, such as smart watches or smart glasses, and only focus on a certain type of application function, and need to cooperate with other devices such as smart phones.
  • the terminal device may also be a terminal device in an Internet of Things (IoT) system.
  • IoT Internet of Things
  • IoT is an important part of the development of information technology in the future. Its main technical feature is to connect objects to the network through communication technology, so as to realize the intelligent network of human-machine interconnection and interconnection of things. IoT technology can achieve massive connections, deep coverage, and power saving for terminal devices through, for example, narrowband NB technology.
  • terminal devices can also include sensors such as smart printers, train detectors, gas stations, etc.
  • the main functions include collecting data (some terminal devices), receiving control information and downlink data from network devices, and sending electromagnetic waves to transmit uplink data to network devices. .
  • FIG. 1 shows a schematic diagram of a communication system 100 applicable to the method provided in the embodiment of the present application.
  • the communication system 100 may include at least one network device, such as the network device 101 in the 5G system shown in FIG. 1; the communication system 100 may also include at least one terminal device, as shown in FIG. Terminal equipment 102 to 107.
  • the terminal devices 102 to 107 may be mobile or fixed.
  • the network device 101 and one or more of the terminal devices 102 to 107 can communicate through a wireless link.
  • Each network device can provide communication coverage for a specific geographic area, and can communicate with terminal devices located in the coverage area. For example, the network device may send configuration information to the terminal device, and the terminal device may send uplink data to the network device based on the configuration information; for another example, the network device may send downlink data to the terminal device. Therefore, the network device 101 and the terminal devices 102 to 107 in FIG. 1 constitute a communication system.
  • the terminal devices can communicate directly.
  • D2D technology can be used to realize direct communication between terminal devices.
  • D2D technology can be used for direct communication.
  • the terminal device 106 and the terminal device 107 may communicate with the terminal device 105 individually or at the same time.
  • the terminal devices 105 to 107 may also communicate with the network device 101, respectively. For example, it can directly communicate with the network device 101.
  • the terminal devices 105 and 106 in the figure can directly communicate with the network device 101; it can also communicate with the network device 101 indirectly, as the terminal device 107 in the figure communicates with the network device via the terminal device 106. 101 communication.
  • FIG. 1 exemplarily shows a network device, multiple terminal devices, and communication links between each communication device.
  • the communication system 100 may include multiple network devices, and the coverage of each network device may include other numbers of terminal devices, for example, more or fewer terminal devices. This application does not limit this.
  • Each of the aforementioned communication devices may be configured with multiple antennas.
  • the plurality of antennas may include at least one transmitting antenna for transmitting signals and at least one receiving antenna for receiving signals.
  • each communication device additionally includes a transmitter chain and a receiver chain.
  • Those of ordinary skill in the art can understand that they can all include multiple components related to signal transmission and reception (such as processors, modulators, multiplexers, etc.). , Demodulator, demultiplexer or antenna, etc.). Therefore, multiple antenna technology can be used to communicate between network devices and terminal devices.
  • the wireless communication system 100 may also include other network entities such as a network controller and a mobility management entity, and the embodiment of the present application is not limited thereto.
  • 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.
  • the following are collectively referred to as network devices.
  • Network equipment can process code words on physical channels.
  • 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 the 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
  • Precoding technology When the channel status is known, the network equipment can process the signal to be sent with the help of a precoding matrix that matches the channel status, so that the precoded signal to be sent is adapted to the channel, thereby This reduces the complexity for the receiving 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, realizing multiple user multiple input multiple output (MU-MIMO).
  • SINR signal to interference plus noise ratio
  • the sending device may also perform precoding in other ways. For example, when channel information (such as but not limited to 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.
  • Channel reciprocity In some communication modes, such as TDD, the uplink and downlink channels transmit signals on the same frequency domain resources and different time domain resources. In a relatively short time (for example, the coherence time of channel propagation), it can be considered that the channel fading experienced by the signals on the uplink and downlink channels is the same. This is the reciprocity of the uplink and downlink channels.
  • the network equipment Based on the reciprocity of the uplink and downlink channels, the network equipment can measure the uplink channel based on the uplink reference signal, such as a sounding reference signal (SRS).
  • SRS sounding reference signal
  • the downlink channel can be estimated according to the uplink channel, so that the precoding matrix for downlink transmission can be determined.
  • the uplink and downlink channels do not have complete reciprocity, and the uplink channel is used to determine the precoding matrix for downlink transmission. It cannot be adapted to the downlink channel.
  • the uplink and downlink channels in the FDD mode still have partial reciprocity, for example, the reciprocity of angle and the reciprocity of delay. Therefore, angle and delay can also be called reciprocity parameters.
  • Multipath time delay causes frequency selective fading, which is the change of frequency domain channel.
  • the time delay is the transmission time of the wireless signal on different transmission paths, which is determined by the distance and speed, and has nothing to do with the frequency domain of the wireless signal.
  • signals are transmitted on different transmission paths, there are different transmission delays due to different distances. Since the physical location between the network equipment and the terminal equipment is fixed, the multipath distribution of the uplink and downlink channels is the same in terms of delay. Therefore, the uplink and downlink channels in the FDD mode with delay can be considered the same, or in other words, reciprocal.
  • the angle may refer to the angle of arrival (AOA) at which the signal reaches the receiving antenna via the wireless channel, or may refer to the angle of departure (AOD) at which the signal is transmitted through the transmitting antenna.
  • AOA angle of arrival
  • AOD angle of departure
  • the angle may refer to the angle of arrival at which the uplink signal reaches the network device, and may also refer to the angle of departure at which the network device transmits the downlink signal. Due to the reciprocity of the transmission paths of the uplink and downlink channels on different frequencies, the arrival angle of the uplink reference signal and the departure angle of the downlink reference signal can be considered to be reciprocal.
  • each angle can be characterized by an angle vector.
  • Each delay can be characterized by a delay vector. Therefore, in the embodiment of the present application, an angle vector may represent an angle, and a delay vector may represent a time delay.
  • Reference signal (RS) and precoding reference signal may also be called a pilot (pilot), reference sequence, etc.
  • the reference signal may be a reference signal used for channel measurement.
  • the reference signal may be a channel state information reference signal (CSI-RS) used for downlink channel measurement, or it may be an SRS used for uplink channel measurement.
  • CSI-RS channel state information reference signal
  • SRS uplink channel measurement
  • the precoding reference signal may be a reference signal obtained by precoding the reference signal.
  • the precoding may specifically include beamforming and/or phase rotation. Wherein, beamforming can be realized by precoding the downlink reference signal based on one or more angle vectors, and phase rotation can be realized by precoding the downlink reference signal with one or more delay vectors, for example.
  • the reference signal obtained after precoding is called a precoding reference signal; the reference signal that has not been precoded is referred to as a reference signal for short .
  • precoding the downlink reference signal based on one or more angle vectors can also be referred to as loading one or more angle vectors on the downlink reference signal to achieve beamforming.
  • Precoding the downlink reference signal based on one or more delay vectors can also be referred to as loading one or more delay vectors on the downlink reference signal to achieve phase rotation.
  • Port It can include a transmitting port and a receiving port.
  • the transmitting port can be understood as a virtual antenna recognized by the receiving device.
  • the port may refer to the transmitting antenna port.
  • the reference signal of each transmit antenna port may be a reference signal that has not been precoded.
  • the transmitting antenna port may refer to an actual independent transmitting unit (transceiver unit, TxRU).
  • the port may also refer to a port after beamforming.
  • the reference signal of each port may be a precoding reference signal obtained by precoding the reference signal based on an angle vector. It is understandable that if beamforming is performed on the reference signal, the number of ports may refer to the number of ports of the precoding reference signal. The number of ports of the precoding reference signal may be less than the number of transmitting antenna ports.
  • a port may also refer to a port after phase rotation.
  • the reference signal of each port may be a precoding reference signal that is precoded based on a delay vector and sent through a transmit antenna port. This port may also be referred to as the port of the precoding reference signal.
  • the port may also refer to the port after beamforming and phase rotation.
  • the reference signal of each port may be a precoding reference signal obtained by precoding the reference signal based on an angle vector and a delay vector. This port may also be referred to as the port of the precoding reference signal.
  • the reference signal of each port can be transmitted through one or more frequency domain units.
  • the transmitting antenna port when the transmitting antenna port is involved, it may refer to the number of ports that have not been spatially precoded. That is, it is the actual number of independent transmission units.
  • a port in different embodiments, it may refer to a transmitting antenna port, or it may refer to a port of a precoding reference signal.
  • the specific meaning expressed by the port can be determined according to specific embodiments.
  • the port of the precoding reference signal is referred to as the reference signal port.
  • the receiving port can be understood as the receiving antenna of the receiving device.
  • the receiving port may refer to the receiving antenna of the terminal device.
  • Angle vector it can be understood as a precoding vector for beamforming the reference signal.
  • the reference signal emitted by the transmitting device can have a certain spatial directivity. Therefore, the process of precoding the reference signal based on the angle vector can also be regarded as the process of spatial domain (or simply, spatial domain) precoding. Therefore, the angle vector can also be called a spatial vector, a beam vector, and so on.
  • the number of ports of the precoding reference signal obtained after precoding the reference signal based on one or more angle vectors is the same as the number of angle vectors.
  • the antenna port dimension can be reduced by spatial precoding, thereby reducing pilot overhead.
  • the angle vector can be a vector of length T.
  • the angle vector is a Discrete Fourier Transform (DFT) vector.
  • the DFT vector may refer to the vector in the DFT matrix.
  • the angle vector is the conjugate transpose vector of the DFT vector.
  • the DFT conjugate transpose vector may refer to the column vector in the conjugate transpose matrix of the DFT matrix.
  • the angle vector is an oversampled DFT vector.
  • the oversampled DFT vector may refer to the vector in the oversampled DFT matrix.
  • the angle vector may be, for example, the two-dimensional (2 dimensions, 2D)-DFT vector v defined in the type II (type II) codebook in the NR protocol TS 38.214 version 15 (release 15, R15). l,m .
  • the angle vector can be a 2D-DFT vector Or oversampled 2D-DFT vector
  • I 1 is the number of antenna ports in the same polarization direction included in each column (or row) of the antenna array
  • I 2 is the number of antenna ports in the same polarization direction included in each row (or column) of the antenna array.
  • T I 1 ⁇ I 2 .
  • O 1 and O 2 are oversampling factors. i 1 and i 2 satisfy 0 ⁇ i 1 ⁇ (O 1 ⁇ I 1 -1), and 0 ⁇ i 2 ⁇ (O 2 ⁇ I 2 -1).
  • the angle vector is the steering vector of a uniform linear array (ULA).
  • ULA uniform linear array
  • the steering vector can represent the phase difference between the response of different antennas for the angle of arrival of a path.
  • the angle vector is a steering vector of a uniform plane array (UPA).
  • the steering vector may be, for example, a steering vector including horizontal angle and pitch angle information.
  • ⁇ k is the horizontal angle, Is the elevation angle
  • u k is the unit sphere basis vector corresponding to the k-th angle:
  • the angle vector is denoted as a( ⁇ k ).
  • the channel measured by the terminal device according to the received precoding reference signal is equivalent to the channel loaded with the angle vector.
  • loading the angle vector a( ⁇ k ) to the downlink channel V can be expressed as Va( ⁇ k ).
  • the transmitting device is configured with a single-polarized antenna
  • the number of transmitting antenna ports is T; the number of frequency domain units is N, N ⁇ 1, and N is an integer.
  • the channel estimated based on the received reference signal may be a matrix with a dimension of N ⁇ T. If the reference signal is spatially pre-coded based on an angle vector, the angle vector can be loaded onto the reference signal respectively. Since the dimension of the angle vector is T ⁇ 1, for one receiving port of the receiving device, the dimension of the channel estimated based on the precoding reference signal may be N ⁇ 1. And on each receiving port and each frequency domain unit, the dimension of the channel estimated by the terminal device based on the received precoding reference signal may be 1 ⁇ 1.
  • angle vector is a form for representing the angle proposed in this application.
  • the angle vector is only named for the convenience of distinguishing from the time delay, and should not constitute any limitation in this application. This application does not exclude the possibility of defining other names in future agreements to represent the same or similar meanings.
  • Time delay vector It can also be called a frequency domain vector.
  • the delay vector can be used as a vector that represents the changing law of the channel in the frequency domain.
  • multipath delay causes frequency selective fading.
  • the time delay of the signal in the time domain can be equivalent to the phase gradual change in the frequency domain.
  • the Fourier transform can transform the signal into the frequency domain:
  • the signal can be transformed into the frequency domain by Fourier transform: Among them, ⁇ is the frequency variable, and the phase rotation corresponding to different frequencies is different; t and tt 0 represent time delay.
  • the change law of the phase of the channel in each frequency domain unit can be represented by a time delay vector.
  • the delay vector can be used to represent the delay characteristics of the channel.
  • Precoding the reference signal based on the delay vector can essentially refer to the phase rotation of each frequency domain unit in the frequency domain based on the elements in the delay vector, so as to pre-encode the reference signal to pre-encode the frequency caused by the multipath delay.
  • Precoding the reference signal based on different delay vectors is equivalent to performing phase rotation on each frequency domain unit of the channel based on different delay vectors.
  • different resources for example, resource elements (resource elements, RE)
  • RE resource elements
  • the network device may separately precode the reference signal based on each of the L time delay vectors.
  • the length of the delay vector is N, and N may refer to the number of frequency domain units used to carry the reference signal (for example, a reference signal that has not been precoded or a reference signal that has been precoded), N ⁇ 1, and N is an integer.
  • the delay vector is taken from the DFT matrix.
  • Each vector in the DFT matrix can be referred to as a DFT vector.
  • O f is the oversampling factor, O f ⁇ 1; k is the index of the DFT vector, and satisfies 0 ⁇ k ⁇ O f ⁇ N-1 or 1-O f ⁇ N ⁇ k ⁇ 0.
  • the delay vector is denoted as b( ⁇ l ).
  • a resource block is taken as an example of a frequency domain unit to illustrate a specific process of frequency domain precoding on a reference signal.
  • each frequency domain unit includes only one RB for carrying a reference signal.
  • each frequency domain unit may include one or more RBs for carrying reference signals.
  • the network device may load the delay vector on the multiple RBs for carrying reference signals in each frequency domain unit.
  • the reference signal loaded with the delay vector can be transmitted to the terminal device through the downlink channel, the channel measured by the terminal device according to the received precoding reference signal is equivalent to the channel loaded with the delay vector.
  • the reference signal is pre-coded in the frequency domain based on a delay vector of length N, the N elements in the delay vector can be loaded on the reference signal carried on the N RBs. Loading the nth element in the delay vector onto the channel V (n) on the nth RB can be expressed as
  • the frequency domain precoding of the reference signal based on the delay vector may be performed before or after the resource mapping, which is not limited in this application.
  • Fig. 2 shows an example of frequency-domain precoding of reference signals carried on N RBs based on the delay vector b( ⁇ 1 ).
  • the N RBs may include RB#0, RB#1 to RB#N-1.
  • Each of the N RBs includes one or more REs for carrying the reference signal.
  • the RE used to carry the reference signal may be the RE on the first time domain symbol and the first subcarrier in each RB.
  • the time domain vector b( ⁇ 1 ) can be loaded on the first time domain symbol in each RB and the RE on the first subcarrier.
  • the first time domain symbol in each of the N RBs and the reference signal carried on the RE on the first subcarrier may be reference signals corresponding to the same port.
  • the N frequency domain units can be phase rotated.
  • the N elements in the delay vector may correspond to the N frequency domain units one-to-one.
  • the 0th element in the frequency domain vector b( ⁇ 1) Can be loaded on RB#0
  • the first element in the frequency domain vector b( ⁇ 1) Can be loaded on RB#1
  • N-1 elements in the delay vector b( ⁇ 1) Can be loaded on RB#N-1.
  • the nth element in the delay vector b( ⁇ 1) Can be loaded on RB#n.
  • the RB is only an example of a frequency domain unit, and should not constitute any limitation to this application. This application does not limit the specific definition of the frequency domain unit.
  • the delay vector is a form of time delay proposed in this application.
  • the delay vector is only named for the convenience of distinguishing from the angle, and should not constitute any limitation in this application. This application does not exclude the possibility of defining other names in future agreements to represent the same or similar meanings.
  • the channel estimated based on the received reference signal can be expressed as a matrix with a dimension of N ⁇ T. If the reference signal is precoded in the frequency domain based on L delay vectors, for a receiving port of the terminal device, the channel estimated based on the received precoding reference signal can be expressed as a matrix with a dimension of N ⁇ L . And on each receiving port and each frequency domain unit, the dimension of the channel estimated by the terminal device based on the received precoding reference signal may be 1 ⁇ L.
  • Frequency domain unit A unit of frequency domain resources, which can represent different granularity of frequency domain resources.
  • the frequency domain unit may include, but is not limited to, for example, subband (subband), resource block (RB), resource block group (RBG), precoding resource block group (PRG), and the like.
  • the network device may determine the precoding matrix corresponding to each frequency domain unit based on the feedback of the terminal device.
  • Angle delay pair It can also be called a space-frequency vector pair.
  • An angle delay pair can be a combination of an angle vector and a delay vector.
  • Each angle delay pair may include an angle vector and a delay vector. At least one of the angle vector and the delay vector included in any two angle delay pairs is different. In other words, each angle delay pair can be uniquely determined by an angle vector and a delay vector.
  • the precoding matrix used to precode the reference signal when the reference signal is precoded based on an angle vector a( ⁇ k ) and a delay vector b( ⁇ l ), the precoding matrix used to precode the reference signal can be expressed as a The product of the conjugate transpose of an angle vector and a time delay vector, for example, can be expressed as a( ⁇ k ) ⁇ b( ⁇ l ) H , and its dimension may be T ⁇ N.
  • the precoding matrix used to precode the reference signal can also be expressed as the Kronecker product of an angle vector and a delay vector, for example, it can be expressed as Its dimension can be T ⁇ N.
  • the precoding matrix used for precoding the reference signal can also be expressed as the product of the conjugate transpose of a delay vector and an angle vector, or the Kronecker of a delay vector and an angle vector. Product, its dimension can be N ⁇ T.
  • the precoding matrix used for precoding the reference signal may also be expressed as a mathematical transformation of various expressions above. For the sake of brevity, I will not list them all here.
  • the weighted sum of one or more angle delay pairs may be used to determine the space-frequency matrix.
  • a matrix with a dimension T ⁇ N determined based on an angular delay pair can be referred to as a component of the space-frequency matrix, or simply referred to as a space-frequency component matrix.
  • a matrix with a dimension T ⁇ N determined by an angle delay pair is obtained by a( ⁇ k ) ⁇ b( ⁇ l ) H.
  • Space-frequency matrix In this embodiment of the application, the space-frequency matrix is an intermediate quantity used to determine the precoding matrix.
  • the space-frequency matrix may be determined based on the receiving port, and may also be determined based on the transmission layer.
  • the space-frequency matrix can be determined by the weighted sum of one or more angle delay pairs, so the dimension of the space-frequency matrix can also be N ⁇ T.
  • the space-frequency matrix can be referred to as the space-frequency matrix corresponding to the receiving port.
  • the space-frequency matrix corresponding to the receiving port can be used to construct the downlink channel matrix of each frequency domain unit, and then the precoding matrix corresponding to each frequency domain unit can be determined.
  • the channel matrix corresponding to a certain frequency domain unit may be, for example, a conjugate transpose of a matrix constructed from column vectors corresponding to the same frequency domain unit in the space frequency matrix corresponding to each receiving port.
  • a matrix of dimension T ⁇ R can be obtained, where R represents the number of receiving ports, and R ⁇ 1 and is an integer.
  • the channel matrix V (n) of the nth frequency domain unit can be obtained.
  • the space-frequency matrix can be referred to as the space-frequency matrix corresponding to the transmission layer.
  • the space-frequency matrix corresponding to the transmission layer can be directly used to determine the precoding matrix corresponding to each frequency domain unit.
  • the precoding matrix corresponding to a certain frequency domain unit may be constructed by, for example, column vectors corresponding to the same frequency domain unit in the space-frequency matrix corresponding to each transmission layer. For example, extract the nth column vector in the space-frequency matrix corresponding to each transmission layer, and arrange it from left to right according to the order of the transmission layer to obtain a matrix of dimension T ⁇ Z.
  • Z represents the number of transmission layers, Z ⁇ 1 and is an integer. This matrix can be used as the precoding matrix W (n) of the nth frequency domain unit.
  • the precoding matrix determined by the channel measurement method provided in the embodiments of the present application may be a precoding matrix directly used for downlink data transmission; it may also undergo 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 involved in the following may all refer to a precoding matrix determined based on the channel measurement method provided in this application.
  • the space-frequency matrix is an intermediate quantity proposed based on the frequency domain continuity of the channel that can be used to construct the precoding matrix.
  • F H is the conjugate of F
  • the transposed matrix, C represents a coefficient matrix formed by weighting coefficients corresponding to each of the K angle vectors and each of the L delay vectors. Each element in C can represent the weighting coefficient of a corresponding angle vector pair.
  • the space-frequency component matrix is defined as determined by a( ⁇ k ) ⁇ b( ⁇ l ) H. From this, the dimension of the space-frequency matrix H DL can be determined as: the number of transmitting antenna ports ⁇ the number of frequency domain units. For example, the dimension of the space-frequency matrix corresponding to the downlink channel is T ⁇ N. In the following embodiments, unless otherwise specified, the space-frequency matrix refers to the aforementioned matrix H DL with a dimension of T ⁇ N.
  • the dimension of the channel matrix is defined as: the number of receiving ports ⁇ the number of transmitting ports, for example, the dimension of the downlink channel is R ⁇ T.
  • the dimension of the space-frequency matrix determined by the channel matrix is N ⁇ T, which is exactly the opposite of the dimension T ⁇ N of the aforementioned space-frequency matrix H DL. Therefore, in the embodiment of the present application, the real channel may be the conjugate transpose of the channel matrix determined by the above-mentioned space-frequency matrix H DL.
  • the downlink channel matrix determined by the space-frequency matrix H DL may be the conjugate transpose of the real channel.
  • the precoding matrix can be determined by the space frequency matrix H DL.
  • the precoding matrix of the nth frequency domain unit may be constructed by the nth column vector in the space frequency matrix corresponding to each transmission layer.
  • the conjugate transpose of the precoding matrix can be obtained by performing the SVD of the channel matrix V.
  • V H is SVD
  • the precoding matrix can just be obtained. Therefore, the space-frequency matrix H DL determined by the conjugate transpose of the real channel in the embodiment of the present application can be directly determined to obtain the precoding matrix corresponding to each frequency domain unit.
  • H DL SC DL F H deformation
  • H H DL C DL F H
  • H C DL F H
  • C DL F H C DL F H
  • C DL (H DL H S) H F.
  • H DL H is the space-frequency matrix determined by the real channel
  • H DL H S is the real channel after spatial precoding.
  • Each element of C DL in the coefficient matrix can be determined by multiplying a row in (H DL H S) H and a column in F, respectively.
  • each element in the matrix coefficient C DL may be conjugated by a real channel H DL H S transpose (H DL H S) H and a row F is multiplied, or that is true
  • the conjugate transpose of a column of channel H DL H S is multiplied by a column of F.
  • the space-frequency matrix H DL determined based on the weighting coefficients of the angle delay pairs fed back by the terminal device may be obtained by the conjugate transpose of the real channel.
  • the space-frequency matrix in the embodiment of the present application may also be obtained by the conjugate transpose of the real channel V (that is, V H ).
  • the relationship between the real channel and the space-frequency matrix H DL is not fixed. Different definitions of the space-frequency matrix and the space-frequency component matrix may change the relationship between the real channel and the space-frequency matrix H DL.
  • the space-frequency matrix H DL can be obtained by the conjugate transpose of the real channel, or can be obtained by the transposition of the real channel.
  • the operations performed by the network equipment when loading the delay and angle are also different, and the operations performed by the terminal equipment during channel measurement and feedback also change accordingly .
  • this is only the implementation behavior of terminal equipment and network equipment, and should not constitute any limitation to this application.
  • the embodiments of the present application are only for ease of understanding, and show a situation where the space-frequency matrix is obtained by the conjugate transpose of the real channel.
  • This application does not limit the definition of the channel matrix, the dimension and definition of the space-frequency matrix, and the conversion relationship between the two. Similarly, this application does not limit the conversion relationship between the space-frequency matrix and the precoding matrix.
  • Antenna delay pair It can be a combination of a transmitting antenna port and a delay vector.
  • Each antenna delay pair may include a transmitting antenna port and a delay vector.
  • the transmit antenna ports and/or delay vectors included in any two antenna delay pairs are different.
  • each antenna delay pair can be uniquely determined by a transmitting antenna port and a delay vector.
  • the antenna delay pair can be understood as the expression form of the space-frequency basic unit determined by a transmitting antenna port and a delay vector, but it is not necessarily the only expression form. This application deals with the relationship between the transmitting antenna port and the delay vector.
  • the form of expression of the combination is not limited.
  • T the number of transmitting antenna ports in a polarization direction, T is a positive integer
  • P The number of transmit ports in a polarization direction, P is a positive integer
  • R the number of receiving ports, R is a positive integer
  • Z the number of transmission layers, Z is a positive integer
  • N the number of frequency domain units used to carry the reference signal, N is a positive integer
  • K angle vector number, K is a positive integer
  • L the number of delay vectors, L is a positive integer
  • J the number of polarization directions of the transmitting antenna, J is a positive integer
  • serial numbers can be started from 0.
  • the K angle vectors may include the 0th angle vector to the K-1th angle vector
  • the L delay vectors may include the 0th delay vector to the L-1th delay vector, etc., for brevity, here Not to list them all.
  • the specific implementation is not limited to this.
  • it can also be numbered consecutively starting from 1.
  • the K angle vectors may include the first angle vector to the Kth angle vector
  • the L delay vectors may include the first delay vector to the Lth delay vector, and so on.
  • the superscript T means transpose, such as AT means the transpose of matrix (or vector) A;
  • superscript * means conjugate, for example, A * means the conjugate of matrix (or vector) A;
  • superscript H means Conjugate transpose, for example, A H represents the conjugate transpose of matrix (or vector) A.
  • the angle vector and the delay vector are both column vectors as an example to illustrate the embodiments provided in the present application, but this should not constitute any limitation to the present application. Based on the same concept, those skilled in the art can also think of other more possible expressions.
  • used to indicate can include both used for direct indication and used for indirect indication.
  • the indication information may directly indicate A or indirectly indicate A, but it does not mean that A must be carried in the indication information.
  • the information indicated by the indication information can also be referred to as the information to be indicated.
  • the information to be indicated can be directly indicated, such as the information to be indicated or The index of the information to be indicated, 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, while other parts of the information to be indicated are known or agreed in advance. For example, it is also possible to realize the indication of specific information by means of a pre-arranged order (for example, stipulated in an agreement) of various information, so as to reduce 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 instruction manner may also be various existing instruction manners, such as but not limited to the foregoing instruction manners and various combinations thereof.
  • 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 that can make the instruction to be instructed 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 transpose 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 to each other, and so on.
  • 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, for example, but not limited to, one or a combination of at least two of radio resource control signaling, media access control (MAC) layer signaling, and physical layer signaling.
  • radio resource control signaling such as packet radio resource control (RRC) signaling
  • MAC layer signaling for example, includes MAC control element (CE);
  • physical layer signaling for example, includes downlink control information (downlink control). information, DCI).
  • “pre-defined” or “pre-configured” can be realized by pre-saving corresponding codes, tables or other methods that can be used to indicate relevant information in the equipment (for example, including terminal equipment and network equipment).
  • the specific implementation method is not limited.
  • "saving” may refer to storing 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 a decoder, a processor, or a communication device.
  • the type of the memory can 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, A and B exist at the same time, 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 a plurality of 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 transmitting port may refer to a port for transmitting a reference signal (such as a precoding reference signal).
  • the receiving port may refer to a port that receives a reference signal (such as a precoding reference signal, etc.).
  • the transmitting port may be a port on the network device side, and the receiving port may be a port on the terminal device side.
  • the network device can reconstruct the downlink CSI based on the prior information of the uplink channel (that is, the multipath angle and delay) and the supplementary information fed back by the terminal device. Specifically, the network device generates precoding according to the angle and time delay, and uses the precoding to encode the downlink signal. The terminal device receives the coded downlink signal, and generates a weighting coefficient according to the coded downlink signal.
  • the network receives the weighting coefficient, and determines the downlink CSI according to the weighting coefficient and combining the multipath angle and time delay.
  • the accuracy of the weighting coefficient generated by the terminal device is not high, resulting in inaccurate downlink CSI calculated by the network device. Therefore, how to obtain accurate downlink CSI needs to be solved urgently.
  • the embodiments shown below do not specifically limit the specific structure of the execution body of the method provided in the embodiments of the application, as long as the program can be run and recorded with the code of the method provided in the embodiments of the application to provide the method according to the embodiments of the application.
  • the execution subject of the method provided in the embodiments of the present application may be a terminal device or a network device, or a functional module in the terminal device or the network device that can call and execute the program.
  • FIG. 3 shows a schematic flowchart of a method for determining downlink CSI according to an embodiment of the present application.
  • the terminal device selects a weighting coefficient matrix with the largest norm from a plurality of weighting coefficient matrices as a target weighting coefficient matrix, and the target weighting coefficient matrix is used by the network device to determine downlink CSI.
  • taking the maximum value of the norm of the weighting coefficient matrix can be understood as obtaining the maximum value of energy.
  • the terminal device uses the weighting coefficient matrix with the largest energy to restore the downlink channel, that is, the embodiment of the present application helps the network device to obtain more accurate downlink CSI.
  • the elements of the weighting coefficient matrix can be one or more weighting coefficients for one antenna (for example, the weighting coefficient matrix includes 32 weighting coefficients for one antenna), or multiple weighting coefficients for multiple antennas. Coefficients (for example, the weighting coefficient matrix includes 32 ⁇ 4 weighting coefficients for 4 antennas), which is not limited in this application.
  • the norm of the weighting coefficient may be 1 norm, 2 norm or ⁇ norm, which is not limited in this application.
  • C * arg max
  • the terminal device may determine the first weighting coefficient matrix among the multiple weighting coefficient matrices according to the first timing deviation value within the value range of the timing deviation.
  • the terminal device may calculate the weighting coefficient matrix according to the timing deviation, that is, different timing deviations correspond to different weighting coefficient matrices.
  • the terminal device can determine the weighting coefficient matrix corresponding to different timing deviation values according to the value range of the timing deviation, and then select the target weighting coefficient matrix from the weighting coefficient matrix corresponding to the different timing deviation values, thereby helping To improve the accuracy of determining the downlink CSI.
  • the first weighting coefficient matrix may be any one of the multiple weighting coefficient matrices. That is to say, any one of the multiple weighting coefficient matrices can be determined in the above-mentioned manner.
  • the following embodiments take a weighting coefficient matrix (ie, the first weighting coefficient matrix) as an example for description, but the application is not limited to this.
  • the terminal device may also receive instruction information sent by the network device, where the instruction information is used to indicate the value range of the timing deviation.
  • the network device sends the instruction information to the terminal device.
  • the network device may set the value range of the timing deviation, and notify the terminal device through instruction information.
  • the value range of the timing deviation may also be stipulated in the protocol, or agreed between the network device and the terminal device, or may be set by the terminal device itself, which is not limited in this application.
  • the terminal device determining the weighting coefficient matrix according to the timing deviation value may first determine the compensation phase according to the timing deviation value, and then determine the weighting coefficient matrix according to the compensation phase.
  • the compensation phase determined by the terminal device according to the timing deviation value may be Among them, f k represents the frequency of the k-th subband, and ⁇ is the timing deviation value. Or the compensation phase determined by the terminal device according to the timing deviation value may be e 2 ⁇ jk ⁇ f ⁇ , where ⁇ f represents the bandwidth of the subband, and ⁇ is the timing deviation value.
  • c n represents the nth column in the first weighting coefficient matrix, and n is any one of 1, 2, ..., N
  • For the compensation phase Indicates the channel value of the nth receiving antenna and the kth subband, Represents the precoding weight vector on the p-th port and the k-th subband of the network device.
  • the terminal device determining the weighting coefficient according to the compensation phase may specifically be that the compensation phase and the nth column in the first weighting coefficient matrix satisfy the following formula:
  • c n represents the nth column of the first weighting coefficient matrix
  • n is any one of 1, 2, ..., N
  • e 2 ⁇ jk ⁇ f ⁇ is the compensation phase
  • step 301 may specifically be:
  • the terminal device sends the target weighting coefficient matrix to the network device.
  • the network device sends the target weighting coefficient matrix to the terminal device.
  • the terminal device determines the weighting coefficient whose norm takes the maximum value as the target weighting coefficient, and sends it to the network device. That is to say, the terminal device uses the weighting coefficient matrix with the largest energy to restore the downlink channel, so that the network device can obtain more accurate downlink CSI and help improve the communication quality of the downlink signal transmission.
  • the methods and operations implemented by terminal devices can also be implemented by components (such as chips or circuits) that can be used in terminal devices
  • the methods and operations implemented by network devices can also be implemented by It can be implemented by components (such as chips or circuits) of network devices.
  • each network element such as a terminal device or a network device
  • each network element includes hardware structures and/or software modules corresponding to each function in order to realize the above-mentioned functions.
  • the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed by hardware or computer software-driven hardware depends on the specific application and design constraint conditions of the technical solution. Professionals and technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered beyond the scope of this application.
  • the embodiment of the present application may divide the terminal device or the network device into functional modules according to the foregoing method examples.
  • each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module.
  • the above-mentioned integrated modules can be implemented either in the form of hardware or in the form of software functional modules. It should be noted that the division of modules in the embodiments of the present application is illustrative, and is only a logical function division, and there may be other division methods in actual implementation. The following is an example of using the corresponding functional modules to divide each functional module.
  • the size of the sequence number of the above-mentioned processes does not mean the order of execution, and the execution order of each process should be determined by its function and internal logic, and should not correspond to the embodiments of the present application.
  • the implementation process constitutes any limitation.
  • FIG. 4 shows a schematic block diagram of an apparatus 400 for determining downlink channel state information CSI according to an embodiment of the present application.
  • the apparatus 400 may correspond to each terminal device or chip in the terminal device shown in FIG. 1, and the terminal device or chip in the terminal device in the embodiment shown in FIG. Any function of the terminal device in the method embodiment.
  • the device 400 includes a transceiver module 410 and a processing module 420.
  • the processing module 420 is configured to select a weighting coefficient matrix with the largest norm from a plurality of weighting coefficient matrices as the target weighting coefficient matrix, and the target weighting coefficient matrix is used by the network device to determine the downlink CSI;
  • the transceiver module 410 is configured to send the target weighting coefficient matrix to the network device.
  • processing module 420 is specifically configured to:
  • processing module 420 is specifically configured to:
  • the first weighting coefficient matrix is determined.
  • the transceiver module 410 is further configured to receive indication information from the network device, where the indication information is used to indicate the value range of the timing deviation.
  • the target weighting coefficient matrix and the multiple weighting coefficient matrices satisfy the following formula:
  • transceiver module 410 and processing module 420, reference may be made to the relevant description in the foregoing method embodiment, which is not described here.
  • FIG. 5 shows a communication device 500 provided by an embodiment of the present application.
  • the device 500 may be the terminal device described in FIG. 3.
  • the device can adopt the hardware architecture shown in FIG. 5.
  • the device may include a processor 510 and a transceiver 530.
  • the device may also include a memory 540.
  • the processor 510, the transceiver 530, and the memory 540 communicate with each other through an internal connection path.
  • the related functions implemented by the processing module 420 in FIG. 4 may be implemented by the processor 510, and the related functions implemented by the transceiver module 410 may be implemented by the processor 510 controlling the transceiver 530.
  • the processor 510 may be a general-purpose central processing unit (central processing unit, CPU), a microprocessor, an application-specific integrated circuit (ASIC), a dedicated processor, or one or more It is an integrated circuit that implements the technical solutions of the embodiments of the present application.
  • a processor may refer to one or more devices, circuits, and/or processing cores for processing data (for example, computer program instructions).
  • it can be a baseband processor or a central processing unit.
  • the baseband processor can be used to process communication protocols and communication data
  • the central processor can be used to control communication devices (such as base stations, terminal equipment, or chips), execute software programs, and process data in the software programs.
  • the processor 510 may include one or more processors, for example, include one or more central processing units (central processing unit, CPU).
  • CPU central processing unit
  • the CPU may be a single processor.
  • the core CPU can also be a multi-core CPU.
  • the transceiver 530 is used to send and receive data and/or signals, and to receive data and/or signals.
  • the transceiver may include a transmitter and a receiver, the transmitter is used to send data and/or signals, and the receiver is used to receive data and/or signals.
  • the memory 540 includes but is not limited to random access memory (RAM), read-only memory (ROM), erasable programmable memory (erasable read only memory, EPROM), read-only memory A compact disc (read-only memory, CD-ROM), the memory 540 is used to store related instructions and data.
  • RAM random access memory
  • ROM read-only memory
  • EPROM erasable programmable memory
  • EPROM erasable read only memory
  • CD-ROM compact disc
  • the memory 540 is used to store related instructions and data.
  • the memory 540 is used to store program codes and data of the terminal device, and may be a separate device or integrated in the processor 510.
  • the processor 510 is configured to control the transceiver to perform information transmission with the terminal device.
  • the processor 510 is configured to control the transceiver to perform information transmission with the terminal device.
  • the transceiver to perform information transmission with the terminal device.
  • the apparatus 500 may further include an output device and an input device.
  • the output device communicates with the processor 510 and can display information in a variety of ways.
  • the output device can be a liquid crystal display (LCD), a light emitting diode (LED) display device, a cathode ray tube (CRT) display device, or a projector, etc.
  • the input device communicates with the processor 510 and can receive user input in a variety of ways.
  • the input device can be a mouse, a keyboard, a touch screen device, or a sensor device.
  • FIG. 5 only shows a simplified design of the communication device.
  • the device may also contain other necessary components, including but not limited to any number of transceivers, processors, controllers, memories, etc., and all terminal devices that can implement this application are protected by this application. Within range.
  • the apparatus 500 may be a chip, for example, a communication chip that can be used in a terminal device to implement related functions of the processor 510 in the terminal device.
  • the chip can be a field programmable gate array, a dedicated integrated chip, a system chip, a central processing unit, a network processor, a digital signal processing circuit, a microcontroller, and a programmable controller or other integrated chips for realizing related functions.
  • the chip may optionally include one or more memories for storing program codes. When the codes are executed, the processor realizes corresponding functions.
  • the embodiment of the present application also provides a device, which may be a terminal device or a circuit.
  • the device can be used to perform the actions performed by the terminal device in the foregoing method embodiments.
  • FIG. 6 shows a schematic block diagram of a communication device 600 according to an embodiment of the present application.
  • the apparatus 600 may correspond to the network device or the chip in the network device shown in FIG. 1, or the network device or the chip in the network device in the embodiment shown in FIG. Any function.
  • the device 600 includes a transceiver module 610 and a post-processing module 620.
  • the transceiver module 610 is configured to receive a target weighting coefficient matrix, where the target weighting coefficient matrix is the weighting coefficient matrix with the largest norm among the multiple weighting coefficient matrices for the terminal device;
  • the processing module 620 is configured to determine the downlink CSI according to the target weighting coefficient matrix.
  • the transceiver module 610 is further configured to send indication information to the terminal device.
  • the indication information is used to indicate the range of the timing deviation, and the timing deviation value within the range of the timing deviation is used by the terminal device to determine the Each weighting coefficient matrix in the plurality of weighting coefficient matrices.
  • transceiver module 610 and processing module 620, reference may be made to the relevant description in the foregoing method embodiment, which is not described here.
  • FIG. 7 shows a communication device 700 provided by an embodiment of the present application.
  • the device 700 may be the network device described in FIG. 3.
  • the device can adopt the hardware architecture shown in FIG. 7.
  • the device may include a processor 710 and a transceiver 720.
  • the device may also include a memory 730.
  • the processor 710, the transceiver 720, and the memory 730 communicate with each other through an internal connection path.
  • the related functions implemented by the processing module 620 in FIG. 6 may be implemented by the processor 710, and the related functions implemented by the transceiver module 610 may be implemented by the processor 710 controlling the transceiver 720.
  • the processor 710 may be a general-purpose central processing unit (central processing unit, CPU), a microprocessor, an application-specific integrated circuit (ASIC), a dedicated processor, or one or more It is an integrated circuit that implements the technical solutions of the embodiments of the present application.
  • a processor may refer to one or more devices, circuits, and/or processing cores for processing data (for example, computer program instructions).
  • it can be a baseband processor or a central processing unit.
  • the baseband processor can be used to process communication protocols and communication data
  • the central processor can be used to control communication devices (such as base stations, terminal equipment, or chips), execute software programs, and process data in the software programs.
  • the processor 710 may include one or more processors, for example, include one or more central processing units (central processing unit, CPU).
  • CPU central processing unit
  • the CPU may be a single processor.
  • the core CPU can also be a multi-core CPU.
  • the transceiver 720 is used to send and receive data and/or signals, and to receive data and/or signals.
  • the transceiver may include a transmitter and a receiver, the transmitter is used to send data and/or signals, and the receiver is used to receive data and/or signals.
  • the memory 730 includes, but is not limited to, random access memory (RAM), read-only memory (ROM), erasable programmable memory (erasable read only memory, EPROM), and read-only memory.
  • RAM random access memory
  • ROM read-only memory
  • EPROM erasable read only memory
  • read-only memory erasable read only memory
  • CD-ROM compact disc
  • the memory 730 is used to store program codes and data of the network device, and may be a separate device or integrated in the processor 710.
  • the processor 710 is configured to control the transceiver to perform information transmission with the terminal device.
  • the processor 710 is configured to control the transceiver to perform information transmission with the terminal device.
  • the apparatus 700 may further include an output device and an input device.
  • the output device communicates with the processor 710 and can display information in a variety of ways.
  • the output device can be a liquid crystal display (LCD), a light emitting diode (LED) display device, a cathode ray tube (CRT) display device, or a projector, etc.
  • the input device communicates with the processor 710 and can receive user input in a variety of ways.
  • the input device can be a mouse, a keyboard, a touch screen device, or a sensor device.
  • FIG. 7 only shows a simplified design of the communication device.
  • the device can also contain other necessary components, including but not limited to any number of transceivers, processors, controllers, memories, etc., and all network devices that can implement this application are protected by this application. Within range.
  • the apparatus 700 may be a chip, for example, a communication chip that can be used in a network device, and is used to implement related functions of the processor 710 in the network device.
  • the chip can be a field programmable gate array, a dedicated integrated chip, a system chip, a central processing unit, a network processor, a digital signal processing circuit, a microcontroller, and a programmable controller or other integrated chips for realizing related functions.
  • the chip may optionally include one or more memories for storing program codes. When the codes are executed, the processor realizes corresponding functions.
  • the embodiment of the present application also provides a device, which may be a network device or a circuit.
  • the device can be used to perform the actions performed by the network device in the foregoing method embodiments.
  • FIG. 8 shows a simplified schematic diagram of the structure of the terminal device. It is easy to understand and easy to illustrate.
  • the terminal device uses a mobile phone as an example.
  • the terminal equipment includes a processor, a memory, a radio frequency circuit, an antenna, and an input and output device.
  • the processor is mainly used to process the communication protocol and communication data, and to control the terminal device, execute the software program, and process the data of the software program.
  • the memory is mainly used to store software programs and data.
  • the radio frequency circuit is mainly used for the conversion of baseband signals and radio frequency signals and the processing of radio frequency signals.
  • the antenna is mainly used to send and receive radio frequency signals in the form of electromagnetic waves.
  • Input and output devices such as touch screens, display screens, keyboards, etc., are mainly used to receive data input by users and output data to users. It should be noted that some types of terminal devices may not have input and output devices.
  • the processor When data needs to be sent, the processor performs baseband processing on the data to be sent, and then outputs the baseband signal to the radio frequency circuit.
  • the radio frequency circuit performs radio frequency processing on the baseband signal and sends the radio frequency signal to the outside in the form of electromagnetic waves through the antenna.
  • the radio frequency circuit receives the radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor, and the processor converts the baseband signal into data and processes the data.
  • FIG. 8 only one memory and processor are shown in FIG. 8. In an actual terminal device product, there may be one or more processors and one or more memories.
  • the memory may also be referred to as a storage medium or storage device.
  • the memory may be set independently of the processor or integrated with the processor, which is not limited in the embodiment of the present application.
  • the antenna and radio frequency circuit with the transceiving function can be regarded as the transceiving unit of the terminal device
  • the processor with the processing function can be regarded as the processing unit of the terminal device.
  • the terminal device includes a transceiving unit 810 and a processing unit 820.
  • the transceiving unit may also be referred to as a transceiver, a transceiver, a transceiving device, and so on.
  • the processing unit may also be called a processor, a processing board, a processing module, a processing device, and so on.
  • the device for implementing the receiving function in the transceiving unit 810 can be regarded as the receiving unit, and the device for implementing the sending function in the transceiving unit 810 can be regarded as the sending unit, that is, the transceiving unit 810 includes a receiving unit and a sending unit.
  • the transceiver unit may sometimes be referred to as a transceiver, a transceiver, or a transceiver circuit.
  • the receiving unit may sometimes be called a receiver, a receiver, or a receiving circuit.
  • the transmitting unit may sometimes be called a transmitter, a transmitter, or a transmitting circuit.
  • transceiving unit 810 is configured to perform sending and receiving operations on the terminal device side in the foregoing method embodiment
  • processing unit 820 is configured to perform other operations on the terminal device in the foregoing method embodiment except for the transceiving operation.
  • the processing unit 820 is configured to execute the processing step 302 on the terminal device side in FIG. 3.
  • the transceiving unit 810 is configured to perform the transceiving operation of step 301 in FIG. 3, and/or the transceiving unit 810 is further configured to perform other transceiving steps on the terminal device side in the embodiment of the present application.
  • the chip When the device is a chip, the chip includes a transceiver unit and a processing unit.
  • the transceiver unit may be an input/output circuit or a communication interface;
  • the processing unit is a processor, microprocessor, or integrated circuit integrated on the chip.
  • the device shown in FIG. 9 can also be referred to.
  • the device can perform functions similar to the processor 510 in FIG. 5.
  • the device includes a processor 901, a data sending processor 903, and a data receiving processor 905.
  • the processing module 420 in the embodiment shown in FIG. 4 may be the processor 901 in FIG. 9 and complete corresponding functions.
  • the transceiver module 410 in the embodiment shown in FIG. 4 may be the sending data processor 903 and the receiving data processor 905 in FIG. 9.
  • the channel encoder and the channel decoder are shown in FIG. 9, it can be understood that these modules do not constitute a restrictive description of this embodiment, and are merely illustrative.
  • the processing device 1000 includes modules such as a modulation subsystem, a central processing subsystem, and a peripheral subsystem.
  • the communication device in this embodiment can be used as the modulation subsystem therein.
  • the modulation subsystem may include a processor 1003 and an interface 1004.
  • the processor 1003 completes the function of the aforementioned processing module 420
  • the interface 1004 completes the function of the aforementioned transceiver module 410.
  • the modulation subsystem includes a memory 1006, a processor 1003, and a program stored in the memory and running on the processor, and the processor implements the method described in the embodiment when the program is executed.
  • the memory 1006 can be non-volatile or volatile, and its location can be located inside the modulation subsystem or in the processing device 1000, as long as the memory 1006 can be connected to the The processor 1003 is fine.
  • the network device may be as shown in FIG. 11, for example, the device 110 is a base station.
  • the base station 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 110 may include one or more DU 1101 and one or more CU 1102. CU1102 can communicate with the next-generation core network (NG core, NC).
  • the DU 1101 may include at least one antenna 11011, at least one radio frequency unit 11012, at least one processor 11013, and at least one memory 11014.
  • the DU 1101 part is mainly used for the transmission and reception of radio frequency signals, the conversion of radio frequency signals and baseband signals, and part of baseband processing.
  • the CU1102 may include at least one processor 11022 and at least one memory 11021.
  • CU1102 and DU1101 can communicate through interfaces, where the control plane interface can be Fs-C, such as F1-C, and the user plane interface can be Fs-U, such as F1-U.
  • the control plane interface can be Fs-C, such as F1-C
  • the user plane interface can be Fs-U, such as F1-U.
  • the CU 1102 part is mainly used to perform baseband processing, control the base station, and so on.
  • the DU 1101 and the CU 1102 may be physically set together, or may be physically separated, that is, a distributed base station.
  • the CU 1102 is the control center of the base station, which may also be referred to as a processing unit, and is mainly used to complete the baseband processing function.
  • the CU 1102 may be used to control the base station to execute the operation procedure of the network device in the foregoing method embodiment.
  • the baseband processing on the CU and DU can be divided according to the protocol layer of the wireless network, for example, the packet data convergence protocol (PDCP) layer and the functions of the above protocol layers are set in the CU, the protocol layer below PDCP, For example, functions such as the radio link control (RLC) layer and the medium access control (MAC) layer are set in the DU.
  • CU implements radio resource control (radio resource control, RRC), packet data convergence protocol (packet data convergence protocol, PDCP) layer functions
  • DU implements radio link control (radio link control, RLC), MAC, and physical functions.
  • the function of the (physical, PHY) layer is the packet data convergence protocol (PDCP) layer and the functions of the above protocol layers are set in the CU, the protocol layer below PDCP.
  • functions such as the radio link control (RLC) layer and the medium access control (MAC) layer are set in the DU.
  • RRC radio resource control
  • packet data convergence protocol packet data convergence protocol
  • MAC medium access control
  • the base station 110 may include one or more radio frequency units (RU), one or more DUs, and one or more CUs.
  • the DU may include at least one processor 11013 and at least one memory 11014
  • the RU may include at least one antenna 11011 and at least one radio frequency unit 11012
  • the CU may include at least one processor 11022 and at least one memory 11021.
  • the processor 11013 is configured to execute the processing steps on the network device side in FIG. 3.
  • the radio frequency unit 11012 is used to perform the transceiving operation in step 301 in FIG. 3.
  • the CU1102 may be composed of one or more single boards, and multiple single boards may jointly support a wireless access network (such as a 5G network) with a single access indication, or may respectively support wireless access networks of different access standards.
  • Access network such as LTE network, 5G network or other network.
  • the memory 11021 and the processor 11022 may serve one or more 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 DU1101 can be composed of one or more single boards.
  • Multiple single boards can jointly support a wireless access network with a single access indication (such as a 5G network), and can also support wireless access networks with different access standards (such as a 5G network).
  • the memory 11014 and the processor 11013 may serve one or more 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 computer program product includes one or more computer instructions.
  • the computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices.
  • the computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium.
  • the computer instructions may be transmitted from a website, computer, server, or data center.
  • 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 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.
  • the processor may be an integrated circuit chip with signal processing capabilities.
  • 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 (digital signal processor, DSP), an application specific integrated circuit (ASIC), a ready-made programmable gate array (field programmable gate array, FPGA) or other Programming logic devices, discrete gates or transistor logic devices, discrete hardware components.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA ready-made programmable gate array
  • Programming logic devices discrete gates or transistor logic devices, discrete hardware components.
  • 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 embodiments 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 electrically available 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 RAM
  • DRAM dynamic random access memory
  • synchronous dynamic random access memory synchronous DRAM, SDRAM
  • double data rate synchronous dynamic random access memory double data rate SDRAM, DDR SDRAM
  • enhanced synchronous dynamic random access memory enhanced SDRAM, ESDRAM
  • synchronous link dynamic random access memory synchronous link DRAM, SLDRAM
  • direct memory bus random access memory direct rambus RAM, DR RAM
  • 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, A and B exist at the same time, 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 a plurality of items (a).
  • at least one of a, b, or c can mean: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple .
  • one embodiment or “an embodiment” mentioned throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of the present application. Therefore, the appearances of "in one embodiment” or “in an embodiment” in various places throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. It should be understood that in the various embodiments of the present application, the size of the sequence number of the above-mentioned processes does not mean the order of execution, and the execution order of each process should be determined by its function and internal logic, and should not correspond to the embodiments of the present application. The implementation process constitutes any limitation.
  • 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 can be based on, for example, a signal having one or more data packets (e.g. 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 a signal) Communicate through local and/or remote processes.
  • a signal having one or more data packets (e.g. 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 a signal) Communicate through local and/or remote processes.
  • the disclosed system, device, and method can be implemented in other ways.
  • the device embodiments described above are merely 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 may 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.
  • the functional units in the various embodiments 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.
  • the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium.
  • the technical solution of the present application essentially or 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 methods described in the various embodiments 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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Abstract

L'invention concerne un procédé et un appareil permettant de déterminer des informations d'état de canal de liaison descendante (CSI). Un dispositif terminal détermine un coefficient de pondération avec la norme maximale comme coefficients de pondération cible, puis l'envoie à un dispositif réseau. Autrement dit, le dispositif terminal utilise une matrice de coefficients de pondération ayant l'énergie maximale pour récupérer un canal de liaison descendante, de façon à ce que le dispositif réseau puisse obtenir des CSI de liaison descendante plus précises, ce qui aide à améliorer la qualité de communication de la transmission de signaux en liaison descendante.
PCT/CN2020/073577 2020-01-21 2020-01-21 Procédé et appareil de détermination d'informations d'état de canal de liaison descendante WO2021146938A1 (fr)

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