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    • 专利摘要:
    Embodiments of this application disclose a beam training method and a related device. The method includes: sending, by a first communications device, sidelink control information SCI to a second communications device, where the SCI is used to instruct the first communications device to send at least one channel state information-reference signal CSI-RS to the second communications device; and sending, by the first communications device, the at least one CSI-RS to the second communications device based on the SCI, where the at least one CSI-RS is used by the second communications device to determine that a beam corresponding to a CSI-RS with highest signal strength in the at least one CSI-RS is a beam for communication between the second communications device and the first communications device. According to the embodiments of this application, the CSI-RS used for beam training is dynamically sent based on the instruction of the SCI, and therefore, flexibility of beam training and efficiency of beam training are improved.
    公开号:EP3709531A1
    申请号:EP18894222.1
    申请日:2018-12-21
    公开日:2020-09-16
    发明作者:Zhengzheng XIANG；Jun Luo；Hongjia SU；Jinfang Zhang；Lei Lu
    申请人:Huawei Technologies Co Ltd；
    IPC主号:H04B7-00
    专利说明:
    [0001] This application claims priority to Chinese Patent Application No. 201711455870.8 , filed with the China National Intellectual Property Administration on December 27, 2017 and entitled "BEAM TRAINING METHOD AND RELATED DEVICE", which is incorporated herein by reference in its entirety. TECHNICAL FIELD
    [0002] This application relates to the field of wireless communications technologies, and in particular, to a beam training method and a related device. BACKGROUND
    [0003] Wireless communications technologies have experienced rapid development over the past decades, and has experienced a 1st generation wireless communications system based on an analog communications system, a 2nd generation (2 Generation, 2G) wireless communications system represented by a global system for mobile communications (Global System for Mobile Communication, GSM), a 3G wireless communications system represented by wideband code division multiple access (Wideband Code Division Multiple Access, WCDMA), and then a 4G wireless communications system that has been widely put into commercial use and has achieved great success in the world and that is represented by long term evolution (Long Term Evolution, LTE). Services supported by the wireless communications system are also developed from an initial voice and short message to currently supported wireless highspeed data communication. At the same time, a quantity of wireless connections in the world continuously increases at a high speed, and various new wireless service types also emerge greatly, for example, the internet of things and self-driving. These raise a higher requirement on a next generation 5G wireless communications system.
    [0004] Vehicle-to-vehicle (Vehicle-to-Vehicle, V2V) communication may be considered as a special case of device-to-device (Device-to-Device, D2D) communication. Through direct communication between vehicles, status information and a road condition of another vehicle can be obtained in real time, to better assist vehicle driving or even implement self-driving. FIG. 1 is a schematic diagram of a V2V communication scenario according to a prior-art solution. A running vehicle may directly communicate with another nearby vehicle through V2V communication. Before direct communication is performed between the vehicles, a beam used for communication between the vehicles needs to be determined through beam training, to better resist fading of a high-frequency signal. However, in the prior art, beam training is performed between a base station and a communications device, and a beam training reference signal is semi-statically configured by the base station by using RRC signaling. This lacks flexibility, and efficiency of beam training is not high. SUMMARY
    [0005] Embodiments of this application provide a beam training method and a related device, to improve flexibility of beam training and efficiency of beam training.
    [0006] According to a first aspect, an embodiment of this application provides a beam training method. The method includes:first sending, by a first communications device, sidelink control information SCI to a second communications device, where the SCI is used to instruct the first communications device to send at least one channel state information-reference signal CSI-RS to the second communications device; and then sending the at least one CSI-RS to the second communications device based on the SCI, where the at least one CSI-RS is used by the second communications device to determine that a beam corresponding to a CSI-RS with highest signal strength in the at least one CSI-RS is a beam for communication between the second communications device and the first communications device. The CSI-RS used for beam training is dynamically sent based on the instruction of the SCI, and therefore, flexibility and efficiency of beam training are improved.
    [0007] In a possible design, the first communications device receives feedback information sent by the second communications device. The feedback information includes at least one of an identifier of the beam corresponding to the CSI-RS with the highest signal strength and a resource identifier of the CSI-RS with the highest signal strength. Therefore, the first communications device may determine a beam with highest signal strength, and communicate with the second communications device by using the beam with the highest signal strength.
    [0008] In another possible design, the SCI includes at least one of a device identifier of the second communications device, a scheduling indication of the CSI-RS, and transmission information of the CSI-RS, and the transmission information of the CSI-RS includes at least one of time-frequency resource information of the CSI-RS, a resource identifier of the CSI-RS, and a scrambling identity of the CSI-RS. The scheduling indication of the CSI-RS may be 1-bit information, and is used to notify the second communications device that the CSI-RS is currently scheduled.
    [0009] In another possible design, the SCI includes a time offset K, the time offset K is used to instruct the second communications device to send the feedback information in a Kth subframe after a subframe in which the CSI-RS is received, and K is an integer greater than or equal to 0, so that proper resource scheduling is implemented.
    [0010] In another possible design, the SCI includes first indication information, and the first indication information is used to instruct the second communications device to send the feedback information on a time-frequency resource in the Kth subframe, to better implement resource multiplexing.
    [0011] In another possible design, the CSI-RS is further used for channel measurement, the SCI includes second indication information, and the second indication information is used to indicate that the CSI-RS is used for at least one of channel measurement and beam training.
    [0012] In another possible design, the SCI includes configuration information of the CSI-RS, the configuration information of the CSI-RS includes at least one of an occupied bandwidth, the scrambling identity, an antenna port, and signal density that are of the CSI-RS, and the configuration information of the CSI-RS is preconfigured by a base station and sent to the first communications device. The configuration information of the CSI-RS may be sent by the base station to the first communications device by using radio resource control (Radio Resource Control, RRC) signaling.
    [0013] In another possible design, the first communications device and the second communications device apply wide beam alignment, each wide beam includes a plurality of narrow beams, and the first communications device separately sends CSI-RSs to the second communications device by using a plurality of narrow beams in a same wide beam. Transmit directions of the plurality of narrow beams are different, so that when the second communications device receives each narrow beam, signal strength of the beam or signal strength of a CSI-RS corresponding to the beam may be different. After receiving the plurality of narrow beams, the second communications device may determine a beam with highest signal strength or a CSI-RS with highest signal strength.
    [0014] According to a second aspect, an embodiment of this application provides a beam training method. The method includes:first receiving, by a second communications device, sidelink control information SCI sent by a first communications device, where the SCI is used to instruct the first communications device to send at least one channel state information-reference signal CSI-RS to the second communications device; then receiving, based on the SCI, the at least one channel state information-reference signal CSI-RS sent by the first communications device; and finally determining that a beam corresponding to a CSI-RS with highest signal strength in the at least one CSI-RS is a beam for communication between the second communications device and the first communications device. The CSI-RS used for beam training is dynamically received based on the instruction of the SCI, and therefore, flexibility and efficiency of beam training are improved.
    [0015] In a possible design, the second communications device sends feedback information to the first communications device. The feedback information includes at least one of an identifier of the beam corresponding to the CSI-RS with the highest signal strength and a resource identifier of the CSI-RS with the highest signal strength. Therefore, the first communications device may determine, based on the feedback information, a beam with highest signal strength, and communicate with the second communications device by using the beam with the highest signal strength.
    [0016] In another possible design, the SCI includes at least one of a device identifier of the second communications device, a scheduling indication of the CSI-RS, and transmission information of the CSI-RS, and the transmission information of the CSI-RS includes at least one of time-frequency resource information of the CSI-RS, a resource identifier of the CSI-RS, and a scrambling identity of the CSI-RS.
    [0017] In another possible design, if the SCI includes a time offset K, the second communications device may send, based on the time offset K, the feedback information to the first communications device in a Kth subframe after a subframe in which the CSI-RS is received, to implement proper resource scheduling.
    [0018] In another possible design, if the SCI includes first indication information, the second communications device may send, based on the first indication information, the feedback information to the first communications device on a time-frequency resource in the Kth subframe, to better implement resource multiplexing.
    [0019] In another possible design, the CSI-RS may be used for beam training, or may be used for channel measurement. If the received SCI includes second indication information, the second communications device may determine, based on the second indication information, whether the CSI-RS is used for channel measurement, beam training, or both channel measurement and beam training. If the CSI-RS is used for channel measurement, a rank (Rank), a channel gain, a channel direction, and the like of a channel are measured based on the CSI-RS.
    [0020] In another possible design, the SCI includes configuration information of the CSI-RS, the configuration information of the CSI-RS includes at least one of an occupied bandwidth, the scrambling identity, an antenna port, and signal density that are of the CSI-RS, and the configuration information of the CSI-RS is preconfigured by a base station and sent to the first communications device.
    [0021] According to a third aspect, an embodiment of this application provides a first communications device. The first communications device is configured to implement the method and a function that are performed by the first communications device in the first aspect, and is implemented by hardware/software. The hardware/software includes a unit corresponding to the foregoing function.
    [0022] According to a fourth aspect, an embodiment of this application provides a second communications device. The second communications device is configured to implement the method and a function that are performed by the second communications device in the second aspect, and is implemented by hardware/software. The hardware/software includes a unit corresponding to the foregoing function.
    [0023] According to a fifth aspect, an embodiment of this application provides another first communications device, including a processor, a memory, and a communications bus. The communications bus is configured to implement a connection and communication between the processor and the memory, and the processor executes a program stored in the memory to implement a step in the beam training method provided in the first aspect.
    [0024] In a possible design, the first communications device provided in this application may include a corresponding module configured to perform behavior of the first communications device in the foregoing method design. The module may be software and/or hardware.
    [0025] According to a sixth aspect, an embodiment of this application provides a second communications device, including a processor, a memory, and a communications bus. The communications bus is configured to implement a connection and communication between the processor and the memory, and the processor executes a program stored in the memory to implement a step in the beam training method provided in the second aspect.
    [0026] In a possible design, the second communications device provided in this embodiment of this application may include a corresponding module configured to perform behavior of the second communications device in the foregoing method design. The module may be software and/or hardware.
    [0027] According to a seventh aspect, an embodiment of this application provides a computer-readable storage medium. The computer-readable storage medium stores an instruction, and when the instruction is run on a computer, the computer is enabled to perform the method in the foregoing aspects.
    [0028] According to an eighth aspect, an embodiment of this application provides a computer program product including an instruction. When the computer program product is run on a computer, the computer is enabled to perform the method in the foregoing aspects. BRIEF DESCRIPTION OF DRAWINGS
    [0029] To describe technical solutions in embodiments of this application or in the background more clearly, the following describes the accompanying drawings required for describing the embodiments of this application or the background.FIG. 1 is a schematic diagram of a V2V communication scenario according to a prior-art solution; FIG. 2 is a schematic structural diagram of a wireless communications system according to an embodiment of this application; FIG. 3 is a schematic diagram of a beam training method according to an embodiment of this application; FIG. 4 is a schematic flowchart of a beam training method according to an embodiment of this application; FIG. 5 is a schematic diagram of other beam training according to an embodiment of this application; FIG. 6 is a schematic structural diagram of a V2V subframe according to an embodiment of this application; FIG. 7 is a schematic structural diagram of a V2V self-contained subframe according to an embodiment of this application; FIG. 8 is a schematic structural diagram of a first communications device according to an embodiment of this application; FIG. 9 is a schematic structural diagram of a second communications device according to an embodiment of this application; FIG. 10 is a schematic structural diagram of another first communications device according to an embodiment of this application; and FIG. 11 is a schematic structural diagram of a second communications device according to an embodiment of this application. DESCRIPTION OF EMBODIMENTS
    [0030] The following describes embodiments of this application with reference to the accompanying drawings in the embodiments of this application.
    [0031] FIG. 2 is a schematic structural diagram of a wireless communications system according to an embodiment of this application. The wireless communications system includes a first communications device, a second communications device, and a base station. The first communications device may directly communicate with the second communications device, or may communicate with the second communications device by using the base station. The first communications device or the second communications device may be a device that provides a voice and/or a data connection to a user, may be connected to a computing device such as a laptop computer or a desktop computer, or may be an independent device such as a personal digital assistant (Personal Digital Assistant, PDA). The first communications device or the second communications device may be user equipment (User Equipment, UE), for example, a vehicle, a subscriber unit, a subscriber station, a mobile station, a mobile console, a remote station, an access point, a remote terminal, an access terminal, a user terminal, a user agent, or a user apparatus. The first communications device or the second communications device may alternatively be a chip, for example, a processor. The base station may be an access point, a NodeB, an evolved NodeB (Environment Bureau, eNB), or a 5G base station (Next generation base station, gNB), and is a device in an access network that communicates with a wireless terminal by using one or more sectors on an air interface. By converting a received air interface frame into an IP packet, the base station may serve as a router between the wireless terminal and another part of the access network, and the access network may include an internet protocol network. The base station may further coordinate attribute management for the air interface.
    [0032] Based on the foregoing wireless communications system, LTE V2V communication includes two communication modes. A first communication mode is V2V communication scheduled by a base station, and a V2V communications device may send a control message and data that are of the V2V communication on a scheduled time-frequency resource based on scheduling information of the base station. In a second communication mode, a V2V communications device selects, by itself from available time-frequency resources included in a V2V communications resource pool, a time-frequency resource used for communication, and sends a control message and data on the selected time-frequency resource. The two communication modes have their own advantages and disadvantages and can be flexibly applied to various scenarios.
    [0033] FIG. 3 is a schematic diagram of a beam training method according to an embodiment of this application. In the method, beam training is performed between a base station and a communications device, to determine a beam used for communication between communications devices. The method includes: S301: Abase station and a communications device apply wide beam alignment. In FIG. 3, there is a correspondence between three wide beams (a wide beam 1, a wide beam 2, and a wide beam 3) of the communications device and three wide beams of the base station, and each wide beam includes at least one narrow beam. S302: The communications device separately sends, to the base station by using a plurality of narrow beams included in the wide beam 2, reference signals used for beam training. S303: After receiving the reference signals that are separately sent by the communications device by using the plurality of narrow beams, the base station determines a narrow beam with highest signal strength in the plurality of narrow beams, and then sends indication information to the communications device, where the indication information is used to indicate the narrow beam with the highest signal strength. S304: After receiving the indication information sent by the base station, the communications device selects the narrow beam with the highest signal strength, to communicate with the base station. However, the method is applied to beam training between the base station and the communications device, and the base station periodically sends a reference signal through RRC signaling semi-static configuration. This lacks flexibility, and efficiency of beam training is not high. To resolve the foregoing problems, the embodiments of this application provide the following solutions.
    [0034] FIG. 4 is a schematic flowchart of a beam training method according to an embodiment of this application. The method includes but is not limited to the following steps.
    [0035] S401: A first communications device sends sidelink control information SCI to a second communications device, where the SCI is used to instruct the first communications device to send at least one channel state information-reference signal CSI-RS to the second communications device.
    [0036] During specific implementation, when it is detected that the first communications device needs to communicate with the second communications device and needs to perform beam training with the second communications device, the first communications device generates the CSI-RS used for beam training. Before sending the CSI-RS to the second communications device, the first communications device may send the SCI to the second communications device, and the SCI is used to instruct the second communications device to receive the CSI-RS sent by the first communications device. The SCI includes at least one of a device identifier of the second communications device, a scheduling indication of the CSI-RS, and transmission information of the CSI-RS, and the transmission information of the CSI-RS includes at least one of time-frequency resource information of the CSI-RS, a resource identifier of the CSI-RS, and a scrambling identity of the CSI-RS. The scheduling indication of the CSI-RS may be 1-bit information, and is used to notify the second communications device that the CSI-RS is currently scheduled.
    [0037] Optionally, the SCI includes a time offset K, the time offset K is used to instruct the second communications device to send the feedback information in a Kth subframe after a subframe in which the CSI-RS is received, and K is an integer greater than or equal to 0. Therefore, proper resource scheduling is implemented.
    [0038] Optionally, the SCI includes first indication information, and the first indication information is used to instruct the second communications device to send the feedback information on a time-frequency resource in the Kth subframe, to better implement resource multiplexing.
    [0039] Optionally, the CSI-RS is further used for channel measurement, the SCI includes second indication information, and the second indication information is used to indicate that the CSI-RS is used for at least one of channel measurement and beam training.
    [0040] Optionally, the SCI includes configuration information of the CSI-RS, the configuration information of the CSI-RS includes at least one of an occupied bandwidth, the scrambling identity, an antenna port, and signal density that are of the CSI-RS, and the configuration information of the CSI-RS is preconfigured by a base station and sent to the first communications device. The configuration information of the CSI-RS may be sent by the base station to the first communications device by using radio resource control (Radio Resource Control, RRC) signaling.
    [0041] S402: The first communications device sends the at least one CSI-RS to the second communications device based on the SCI, where the at least one CSI-RS is used by the second communications device to determine that a beam corresponding to a CSI-RS with highest signal strength in the at least one CSI-RS is a beam for communication between the second communications device and the first communications device.
    [0042] During specific implementation, the first communications device and the second communications device apply wide beam alignment, each wide beam includes a plurality of narrow beams, and the first communications device separately sends CSI-RSs to the second communications device by using a plurality of narrow beams in a same wide beam. Transmit directions of the plurality of narrow beams are different, so that when the second communications device receives each narrow beam, signal strength of the beam or signal strength of a CSI-RS corresponding to the beam may be different. After receiving the plurality of narrow beams, the second communications device may determine a beam with highest signal strength or a CSI-RS with highest signal strength.
    [0043] For example, as shown in FIG. 5, a vehicle 1 simultaneously sends a CSI-RS 1, a CSI-RS 2, and a CSI-RS 3 to a vehicle 2 and a vehicle 3 by using three narrow beams (a narrow beam 1, a narrow beam 2, and a narrow beam 3) in a same wide beam. The narrow beam 1 carries the CSI-RS 1, the narrow beam 2 carries the CSI-RS 2, and the narrow beam 3 carries the CSI-RS 3. The narrow beam 1 is in a direction towards the vehicle 2, and the narrow beam 2 and the narrow beam 3 are in directions deviated from the direction to the vehicle 2, so that when receiving the narrow beam 1, the narrow beam 2, and the narrow beam 3, the vehicle 2 may determine that the narrow beam 1 has highest signal strength, the corresponding CSI-RS 1 has highest signal strength, and therefore, the vehicle 2 selects the narrow beam 1 to communicate with the vehicle 1. The narrow beam 3 is in a direction towards the vehicle 3, and the narrow beam 1 and the narrow beam 2 are in directions deviated from the direction to the vehicle 3, so that when receiving the narrow beam 1, the narrow beam 2, and the narrow beam 3, the vehicle 3 may determine that the narrow beam 3 has highest signal strength, the corresponding CSI-RS 3 has highest signal strength, and therefore, the vehicle 3 selects the narrow beam 3 to communicate with the vehicle 1.
    [0044] Optionally, the CSI-RS may be used for beam training, or may be used for channel measurement. If the received SCI includes second indication information, the second communications device may determine, based on the second indication information, whether the CSI-RS is used for channel measurement, beam training, or both channel measurement and beam training. If the CSI-RS is used for channel measurement, a rank (Rank), a channel gain, a channel direction, and the like of a channel are measured based on the CSI-RS.
    [0045] Preferably, after the first communications device sends the at least one CSI-RS to the second communications device based on the SCI, this embodiment of this application further includes the following step:
    [0046] S403: The second communications device sends feedback information to the first communications device, where the feedback information includes at least one of an identifier of the beam corresponding to the CSI-RS with the highest signal strength and a resource identifier of the CSI-RS with the highest signal strength.
    [0047] During specific implementation, after determining the beam with the highest signal strength or the CSI-RS with the highest signal strength, the second communications device may send, to the first communications device, the feedback information including the identifier of the beam with the highest signal strength or the resource identifier of the CSI-RS with the highest signal strength. After receiving the feedback information, the first communications device selects, based on the identifier of the beam with the highest signal strength or the resource identifier of the CSI-RS with the highest signal strength, the beam with the highest signal strength from the at least one beam, to communicate with the second communications device.
    [0048] Optionally, if the SCI includes the time offset K, the second communications device may send, based on the time offset K, the feedback information to the first communications device in the Kth subframe after the subframe in which the CSI-RS is received, to implement proper resource scheduling.
    [0049] For example, FIG. 6 is a schematic structural diagram of a V2V subframe according to an embodiment of this application. The V2V subframe includes SCI and a CSI-RS that are sent by a vehicle 1, and feedback information sent by a vehicle 2. The vehicle 1 sends the SCI and the CSI-RS in an Nth subframe, and the vehicle 2 receives the SCI and the CSI-RS that are sent in the Nth subframe. If a time offset K included in the SCI is 3, the vehicle 2 sends the feedback information to the vehicle 1 in a (N+3)th subframe.
    [0050] Optionally, if the SCI includes first indication information, the second communications device may send, based on the first indication information, the feedback information to the first communications device on a time-frequency resource in the Kth subframe, to better implement resource multiplexing.
    [0051] For example, FIG. 7 is a schematic structural diagram of a V2V self-contained subframe according to an embodiment of this application. The V2V self-contained subframe includes SCI and a corresponding CSI-RS that are sent by a vehicle 1, and a plurality of time-frequency resources of a fixed size are configured in a Kth subframe. The vehicle 1 may send the SCI including first indication information to another vehicle, and the first indication information is used to indicate a time-frequency resource used by the another vehicle to send feedback information. If a time-frequency resource index indicated in SCI received by a vehicle 2 is 1, the vehicle 2 sends feedback information to the vehicle 1 on a time-frequency resource 1 in the Kth subframe. If a time-frequency resource index indicated in SCI received by a vehicle 3 is 2, the vehicle 3 sends feedback information to the vehicle 1 on a time-frequency resource 2 in the Kth subframe.
    [0052] In this embodiment of this application, the first communications device first sends the sidelink control information SCI to the second communications device. After receiving the SCI, the second communications device receives, based on the SCI, the at least one CSI-RS sent by the first communications device, and then determines, based on the CSI-RS, that the beam corresponding to the CSI-RS with the highest signal strength in the at least one CSI-RS is the beam for communication between the second communications device and the first communications device. In the method, the beam used for communication between the communications devices is determined through beam training between the communications devices. In the method, the CSI-RS used for beam training is dynamically sent based on an instruction of the SCI, and therefore, flexibility of beam training and efficiency of beam training are improved. This embodiment of this application may be applied to a 5G wireless communications system (a low-frequency scenario and a high-frequency scenario), or may be applied to a next generation wireless fidelity (Wireless Fidelity, Wi-Fi) network.
    [0053] The foregoing describes in detail the method in the embodiments of this application. The following provides an apparatus in the embodiments of this application.
    [0054] FIG. 8 is a schematic structural diagram of a first communications device according to an embodiment of this application. The first communications device may include a sending module 801 and a receiving module 802. Detailed descriptions of the modules are as follows.
    [0055] The sending module 801 is configured to send sidelink control information SCI to a second communications device, where the SCI is used to instruct the first communications device to send at least one channel state information-reference signal CSI-RS to the second communications device.
    [0056] The sending module 801 is further configured to send the at least one CSI-RS to the second communications device based on the SCI, where the at least one CSI-RS is used by the second communications device to determine that a beam corresponding to a CSI-RS with highest signal strength in the at least one CSI-RS is a beam for communication between the second communications device and the first communications device.
    [0057] Optionally, the receiving module 802 is configured to receive feedback information sent by the second communications device, where the feedback information includes at least one of an identifier of the beam corresponding to the CSI-RS with the highest signal strength and a resource identifier of the CSI-RS with the highest signal strength.
    [0058] The SCI includes at least one of a device identifier of the second communications device, a scheduling indication of the CSI-RS, and transmission information of the CSI-RS, and the transmission information of the CSI-RS includes at least one of time-frequency resource information of the CSI-RS, a resource identifier of the CSI-RS, and a scrambling identity of the CSI-RS.
    [0059] The SCI includes a time offset K, the time offset K is used to instruct the second communications device to send the feedback information in a Kth subframe after a subframe in which the CSI-RS is received, and K is an integer greater than or equal to 0.
    [0060] The SCI includes first indication information, and the first indication information is used to instruct the second communications device to send the feedback information on a time-frequency resource in the Kth subframe.
    [0061] The CSI-RS is further used for channel measurement, the SCI includes second indication information, and the second indication information is used to indicate that the CSI-RS is used for at least one of channel measurement and beam training.
    [0062] The SCI includes configuration information of the CSI-RS, the configuration information of the CSI-RS includes at least one of an occupied bandwidth, the scrambling identity, an antenna port, and signal density that are of the CSI-RS, and the configuration information of the CSI-RS is preconfigured by a base station and sent to the first communications device.
    [0063] It should be noted that, for implementation of the modules, further refer to corresponding descriptions in the method embodiment shown in FIG. 4, and the modules perform the method and a function that are performed by the first communications device in the foregoing embodiment.
    [0064] FIG. 9 is a schematic structural diagram of a second communications device according to an embodiment of this application. The second communications device may include a receiving module 901, a processing module 902, and a sending module 903. Detailed descriptions of the modules are as follows.
    [0065] The receiving module 901 is configured to receive sidelink control information SCI sent by a first communications device, where the SCI is used to instruct the first communications device to send at least one channel state information-reference signal CSI-RS to the second communications device.
    [0066] The receiving module 901 is further configured to receive, based on the SCI, the at least one CSI-RS sent by the first communications device.
    [0067] The processing module 902 is configured to determine that a beam corresponding to a CSI-RS with highest signal strength in the at least one CSI-RS is a beam for communication between the second communications device and the first communications device.
    [0068] Optionally, the sending module 903 is configured to send feedback information to the first communications device, where the feedback information includes at least one of an identifier of the beam corresponding to the CSI-RS with the highest signal strength and a resource identifier of the CSI-RS with the highest signal strength.
    [0069] The SCI includes at least one of a device identifier of the second communications device, a scheduling indication of the CSI-RS, and transmission information of the CSI-RS, and the transmission information of the CSI-RS includes at least one of time-frequency resource information of the CSI-RS, a resource identifier of the CSI-RS, and a scrambling identity of the CSI-RS.
    [0070] The SCI includes a time offset K, andthe sending module 903 is further configured to send, based on the time offset K, the feedback information to the first communications device in a Kth subframe after a subframe in which the CSI-RS is received, where K is an integer greater than or equal to 0.
    [0071] The SCI includes first indication information, andthe sending module 903 is further configured to send, based on the first indication information, the feedback information to the first communications device on a time-frequency resource in the Kth subframe.
    [0072] The CSI-RS is further used for channel measurement, andthe processing module 902 is further configured to determine, based on second indication information, that the CSI-RS is used for at least one of channel measurement and beam training.
    [0073] The SCI includes configuration information of the CSI-RS, the configuration information of the CSI-RS includes at least one of an occupied bandwidth, the scrambling identity, an antenna port, and signal density that are of the CSI-RS, and the configuration information of the CSI-RS is preconfigured by a base station and sent to the first communications device.
    [0074] It should be noted that, for implementation of the modules, further refer to corresponding descriptions in the method embodiment shown in FIG. 4, and the modules perform the method and a function that are performed by the second communications device in the foregoing embodiment.
    [0075] When the first communications device or the second communications device is a chip, the processing module 902 may be a processor, the sending module 801 or the sending module 903 may be an output interface, a pin, a circuit, or the like, and the receiving module 802 or the receiving module 901 may be an input interface, a pin, a circuit, or the like. The transceiver module may be, for example, an input/output interface, a pin, or a circuit. The processing module may execute a computer executable instruction stored in a storage unit, so that the chip in the first communications device or the second communications device performs the method in FIG. 4. Optionally, the storage unit is a storage unit in the chip, for example, a register or a buffer, or the storage unit may be a storage unit in the terminal but outside the chip, for example, a read-only memory (Read-Only Memory, ROM), another type of static storage device capable of storing static information and instructions, or a random access memory (Random Access Memory, RAM).
    [0076] FIG. 10 is a schematic structural diagram of another first communications device according to an embodiment of this application. As shown in the figure, the first communications device may include at least one processor 1001, at least one communications interface 1002, at least one memory 1003, and at least one communications bus 1004.
    [0077] The processor 1001 may be a central processing unit, a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field programmable gate array or another programmable logical device, a transistor logical device, a hardware component, or any combination thereof. The processor may implement or execute various example logical blocks, modules, and circuits described with reference to content disclosed in this application. Alternatively, the processor may be a combination of processors implementing a computing function, for example, a combination of one or more microprocessors, or a combination of a digital signal processor and a microprocessor. The communications bus 1004 may be a peripheral component interconnect PCI bus, an extended industry standard architecture EISA bus, or the like The bus may be classified into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is used to represent the bus in FIG. 10, but this does not mean that there is only one bus or only one type of bus. The communications bus 1004 is configured to implement connections and communication between these components. The communications interface 1002 in the device in this embodiment of this application is configured to perform signaling or data communication with another node device. The memory 1003 may include a volatile memory, for example, a nonvolatile dynamic random access memory (Nonvolatile Random Access Memory, NVRAM), a phase change random access memory (Phase Change RAM, PRAM), or a magnetoresistive random access memory (Magnetoresistive RAM, MRAM). The memory 1003 may further include a nonvolatile memory, for example, at least one magnetic disk storage component, an electrically erasable programmable read-only memory (Electrically Erasable Programmable Read-Only Memory, EEPROM), a flash component such as a NOR flash memory (NOR flash memory) or a NAND flash memory (NAND flash memory), or a semiconductor component such as a solid-state drive (Solid State Disk, SSD). Optionally, the memory 1003 may alternatively be at least one storage apparatus far away from the processor 1001. The memory 1003 stores a group of program code, and the processor 1001 executes a program executed in the memory 1003.
    [0078] Sidelink control information SCI is sent to a second communications device by using the communications interface 1002, and the SCI is used to instruct the first communications device to send at least one channel state information-reference signal CSI-RS to the second communications device.
    [0079] The at least one CSI-RS is sent to the second communications device based on the SCI by using the communications interface 1002, and the at least one CSI-RS is used by the second communications device to determine that a beam corresponding to a CSI-RS with highest signal strength in the at least one CSI-RS is a beam for communication between the second communications device and the first communications device.
    [0080] Optionally, the processor 1001 is further configured to:receive, by using the communications interface 1002, feedback information sent by the second communications device, where the feedback information includes at least one of an identifier of the beam corresponding to the CSI-RS with the highest signal strength and a resource identifier of the CSI-RS with the highest signal strength.
    [0081] The SCI includes at least one of a device identifier of the second communications device, a scheduling indication of the CSI-RS, and transmission information of the CSI-RS, and the transmission information of the CSI-RS includes at least one of time-frequency resource information of the CSI-RS, a resource identifier of the CSI-RS, and a scrambling identity of the CSI-RS.
    [0082] The SCI includes a time offset K, the time offset K is used to instruct the second communications device to send the feedback information in a Kth subframe after a subframe in which the CSI-RS is received, and K is an integer greater than or equal to 0.
    [0083] The SCI includes first indication information, and the first indication information is used to instruct the second communications device to send the feedback information on a time-frequency resource in the Kth subframe.
    [0084] The CSI-RS is further used for channel measurement, the SCI includes second indication information, and the second indication information is used to indicate that the CSI-RS is used for at least one of channel measurement and beam training.
    [0085] The SCI includes configuration information of the CSI-RS, the configuration information of the CSI-RS includes at least one of an occupied bandwidth, the scrambling identity, an antenna port, and signal density that are of the CSI-RS, and the configuration information of the CSI-RS is preconfigured by a base station and sent to the first communications device.
    [0086] Further, the processor may cooperate with the memory and the communications interface, to perform an operation of the first communications device in the foregoing embodiments of this application.
    [0087] FIG. 11 is a schematic structural diagram of a second communications device according to an embodiment of this application. As shown in the figure, the second communications device may include at least one processor 1101, at least one communications interface 1102, at least one memory 1103, and at least one communications bus 1104.
    [0088] The processor 1101 may be processors of various types that are mentioned above. The communications bus 1104 may be a peripheral component interconnect PCI bus, an extended industry standard architecture EISA bus, or the like. The bus may be classified into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is used to represent the bus in FIG. 11, but this does not mean that there is only one bus or only one type of bus. The communications bus 1104 is configured to implement connections and communication between these components. The communications interface 1102 in the device in this embodiment of this application is configured to perform signaling or data communication with another node device. The memory 1103 may be memories of various types that are mentioned above. Optionally, the memory 1103 may be at least one storage apparatus far away from the processor 1101. The memory 1103 stores a group of program code, and the processor 1101 executes a program in the memory 1103 that is executed by the foregoing communications device.
    [0089] Sidelink control information SCI sent by a first communications device is received by using the communications interface 1102, and the SCI is used to instruct the first communications device to send at least one channel state information-reference signal CSI-RS to the second communications device.
    [0090] The at least one CSI-RS sent by the first communications device is received based on the SCI by using the communications interface 1102.
    [0091] That a beam corresponding to a CSI-RS with highest signal strength in the at least one CSI-RS is a beam for communication between the second communications device and the first communications device is determined.
    [0092] Optionally, the processor 1101 is further configured to:send feedback information to the first communications device by using the communications interface 1102, where the feedback information includes at least one of an identifier of the beam with the highest received signal strength and a resource identifier of the CSI-RS with the highest received signal strength.
    [0093] The SCI includes at least one of a device identifier of the second communications device, a scheduling indication of the CSI-RS, and transmission information of the CSI-RS, and the transmission information of the CSI-RS includes at least one of time-frequency resource information of the CSI-RS, a resource identifier of the CSI-RS, and a scrambling identity of the CSI-RS.
    [0094] The SCI includes a time offset K, and the processor 1101 is further configured to:send, based on the time offset K, the feedback information to the first communications device in a Kth subframe after a subframe in which the CSI-RS is received, where K is an integer greater than or equal to 0.
    [0095] The SCI includes first indication information, and the processor 1101 is further configured to:send, based on the first indication information, the feedback information to the first communications device on a time-frequency resource in the Kth subframe.
    [0096] The CSI-RS is further used for channel measurement, and the SCI includes second indication information.
    [0097] Optionally, the processor 1101 is further configured to: determine, by the second communications device based on the second indication information, that the CSI-RS is used for at least one of channel measurement and beam training.
    [0098] The SCI includes configuration information of the CSI-RS, the configuration information of the CSI-RS includes at least one of an occupied bandwidth, the scrambling identity, an antenna port, and signal density that are of the CSI-RS, and the configuration information of the CSI-RS is preconfigured by a base station and sent to the first communications device.
    [0099] Further, the processor may cooperate with the memory and the communications interface, to perform an operation of the second communications device in the foregoing embodiments of this application.
    [0100] All or some of the foregoing embodiments may be implemented by using software, hardware, firmware, or any combination thereof. When software is used to implement the embodiments, the embodiments may be implemented completely or partially in a form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the procedure or functions according to the embodiments of this application are completely or partially generated. The computer may be a general-purpose computer, a dedicated computer, a computer network, or another programmable apparatus. The computer instructions may be stored in a computer-readable storage medium or may be transmitted from a computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from a website, computer, server, or data center to another website, computer, server, or data center in a wired (for example, a coaxial cable, an optical fiber, or a digital subscriber line (DSL)) or wireless (for example, infrared, radio, or microwave) manner. The computer-readable storage medium may be any usable medium accessible by the computer, or a data storage device, such as a server or a data center, integrating one or more usable media. The usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, or a magnetic tape), an optical medium (for example, a DVD), a semiconductor medium (for example, a solid-state drive Solid State Disk (SSD)), or the like.
    [0101] The objectives, technical solutions, and beneficial effects of this application are further described in detail in the foregoing specific implementations. Any modification, equivalent replacement, or improvement made without departing from the spirit and principle of this application shall fall within the protection scope of this application.
    权利要求:
    Claims (48)
    [0001] A beam training method, wherein the method comprises:
    sending, by a first communications device, sidelink control information SCI to a second communications device, wherein the SCI is used to instruct the first communications device to send at least one channel state information-reference signal CSI-RS to the second communications device; and
    sending, by the first communications device, the at least one CSI-RS to the second communications device based on the SCI, wherein the at least one CSI-RS is used by the second communications device to determine that a beam corresponding to a CSI-RS with highest signal strength in the at least one CSI-RS is a beam for communication between the second communications device and the first communications device.
    [0002] The method according to claim 1, wherein the method further comprises:receiving, by the first communications device, feedback information sent by the second communications device, wherein the feedback information comprises at least one of an identifier of the beam corresponding to the CSI-RS with the highest signal strength and a resource identifier of the CSI-RS with the highest signal strength.
    [0003] The method according to claim 1 or 2, wherein the SCI comprises at least one of a device identifier of the second communications device, a scheduling indication of the CSI-RS, and transmission information of the CSI-RS, and the transmission information of the CSI-RS comprises at least one of time-frequency resource information of the CSI-RS, a resource identifier of the CSI-RS, and a scrambling identity of the CSI-RS.
    [0004] The method according to claim 2 or 3, wherein the SCI comprises a time offset K, the time offset K is used to instruct the second communications device to send the feedback information in a Kth subframe after a subframe in which the CSI-RS is received, and K is an integer greater than or equal to 0.
    [0005] The method according to claim 4, wherein the SCI comprises first indication information, and the first indication information is used to instruct the second communications device to send the feedback information on a time-frequency resource in the Kth subframe.
    [0006] The method according to any one of claims 1 to 5, wherein the CSI-RS is further used for channel measurement, the SCI comprises second indication information, and the second indication information is used to indicate that the CSI-RS is used for at least one of channel measurement and beam training.
    [0007] The method according to any one of claims 1 to 6, wherein the SCI comprises configuration information of the CSI-RS, the configuration information of the CSI-RS comprises at least one of an occupied bandwidth, the scrambling identity, an antenna port, and signal density that are of the CSI-RS, and the configuration information of the CSI-RS is preconfigured by a base station and sent to the first communications device.
    [0008] A beam training method, wherein the method comprises:
    receiving, by a second communications device, sidelink control information SCI sent by a first communications device, wherein the SCI is used to instruct the first communications device to send at least one channel state information-reference signal CSI-RS to the second communications device;
    receiving, by the second communications device based on the SCI, the at least one CSI-RS sent by the first communications device; and
    determining, by the second communications device, that a beam corresponding to a CSI-RS with highest signal strength in the at least one CSI-RS is a beam for communication between the second communications device and the first communications device.
    [0009] The method according to claim 8, wherein the method further comprises:sending, by the second communications device, feedback information to the first communications device, wherein the feedback information comprises at least one of an identifier of the beam corresponding to the CSI-RS with the highest signal strength and a resource identifier of the CSI-RS with the highest signal strength.
    [0010] The method according to claim 8 or 9, wherein the SCI comprises at least one of a device identifier of the second communications device, a scheduling indication of the CSI-RS, and transmission information of the CSI-RS, and the transmission information of the CSI-RS comprises at least one of time-frequency resource information of the CSI-RS, a resource identifier of the CSI-RS, and a scrambling identity of the CSI-RS.
    [0011] The method according to claim 9 or 10, wherein the SCI comprises a time offset K, and the sending, by the second communications device, feedback information to the first communications device comprises:sending, by the second communications device based on the time offset K, the feedback information to the first communications device in a Kth subframe after a subframe in which the CSI-RS is received, wherein K is an integer greater than or equal to 0.
    [0012] The method according to claim 11, wherein the SCI comprises first indication information, and the sending, by the second communications device, feedback information to the first communications device comprises:sending, by the second communications device based on the first indication information, the feedback information to the first communications device on a time-frequency resource in the Kth subframe.
    [0013] The method according to any one of claims 8 to 12, wherein the CSI-RS is further used for channel measurement, the SCI comprises second indication information, and the method further comprises:determining, by the second communications device based on the second indication information, that the CSI-RS is used for at least one of channel measurement and beam training.
    [0014] The method according to any one of claims 8 to 13, wherein the SCI comprises configuration information of the CSI-RS, the configuration information of the CSI-RS comprises at least one of an occupied bandwidth, the scrambling identity, an antenna port, and signal density that are of the CSI-RS, and the configuration information of the CSI-RS is preconfigured by a base station and sent to the first communications device.
    [0015] A channel measurement method, wherein the method comprises:
    sending, by a first communications device, sidelink control information SCI to a second communications device, wherein the SCI is used to instruct the first communications device to send at least one channel state information-reference signal CSI-RS to the second communications device; and
    sending, by the first communications device, the at least one CSI-RS to the second communications device based on the SCI, wherein the at least one CSI-RS is used by the second communications device to perform channel measurement.
    [0016] The method according to claim 15, wherein the SCI comprises at least one of a device identifier of the second communications device, a scheduling indication of the CSI-RS, and transmission information of the CSI-RS, and the transmission information of the CSI-RS comprises at least one of time-frequency resource information of the CSI-RS, a resource identifier of the CSI-RS, and a scrambling identity of the CSI-RS.
    [0017] The method according to claim 15 or 16, wherein the SCI comprises a time offset K, the time offset K is used to instruct the second communications device to send feedback information in a Kth subframe after a subframe in which the CSI-RS is received, and K is an integer greater than or equal to 0.
    [0018] The method according to claim 17, wherein the SCI comprises first indication information, and the first indication information is used to instruct the second communications device to send the feedback information on a time-frequency resource in the Kth subframe.
    [0019] A channel measurement method, wherein the method comprises:
    receiving, by a second communications device, sidelink control information SCI sent by a first communications device, wherein the SCI is used to instruct the first communications device to send at least one channel state information-reference signal CSI-RS to the second communications device;
    receiving, by the second communications device based on the SCI, the at least one CSI-RS sent by the first communications device; and
    performing, by the second communications device, channel measurement based on the at least one CSI-RS.
    [0020] The method according to claim 19, wherein the SCI comprises at least one of a device identifier of the second communications device, a scheduling indication of the CSI-RS, and transmission information of the CSI-RS, and the transmission information of the CSI-RS comprises at least one of time-frequency resource information of the CSI-RS, a resource identifier of the CSI-RS, and a scrambling identity of the CSI-RS.
    [0021] The method according to claim 19 or 20, wherein the SCI comprises a time offset K, and the method further comprises:sending, by the second communications device based on the time offset K, feedback information to the first communications device in a Kth subframe after a subframe in which the CSI-RS is received, wherein K is an integer greater than or equal to 0.
    [0022] The method according to claim 21, wherein the SCI comprises first indication information, and the method further comprises:sending, by the second communications device based on the first indication information, the feedback information to the first communications device on a time-frequency resource in the Kth subframe.
    [0023] A first communications device, wherein the first communications device comprises:
    a sending module, configured to send sidelink control information SCI to a second communications device, wherein the SCI is used to instruct the first communications device to send at least one channel state information-reference signal CSI-RS to the second communications device; and
    the sending module is further configured to send the at least one CSI-RS to the second communications device based on the SCI, wherein the at least one CSI-RS is used by the second communications device to determine that a beam corresponding to a CSI-RS with highest signal strength in the at least one CSI-RS is a beam for communication between the second communications device and the first communications device.
    [0024] The first communications device according to claim 23, further comprising:a receiving module, configured to receive feedback information sent by the second communications device, wherein the feedback information comprises at least one of an identifier of the beam corresponding to the CSI-RS with the highest signal strength and a resource identifier of the CSI-RS with the highest signal strength.
    [0025] The first communications device according to claim 23 or 24, wherein the SCI comprises at least one of a device identifier of the second communications device, a scheduling indication of the CSI-RS, and transmission information of the CSI-RS, and the transmission information of the CSI-RS comprises at least one of time-frequency resource information of the CSI-RS, a resource identifier of the CSI-RS, and a scrambling identity of the CSI-RS.
    [0026] The first communications device according to claim 24 or 25, wherein the SCI comprises a time offset K, the time offset K is used to instruct the second communications device to send the feedback information in a Kth subframe after a subframe in which the CSI-RS is received, and K is an integer greater than or equal to 0.
    [0027] The first communications device according to claim 26, wherein the SCI comprises first indication information, and the first indication information is used to instruct the second communications device to send the feedback information on a time-frequency resource in the Kth subframe.
    [0028] The first communications device according to any one of claims 23 to 27, wherein the CSI-RS is further used for channel measurement, the SCI comprises second indication information, and the second indication information is used to indicate that the CSI-RS is used for at least one of channel measurement and beam training.
    [0029] The first communications device according to any one of claims 23 to 28, wherein the SCI comprises configuration information of the CSI-RS, the configuration information of the CSI-RS comprises at least one of an occupied bandwidth, the scrambling identity, an antenna port, and signal density that are of the CSI-RS, and the configuration information of the CSI-RS is preconfigured by a base station and sent to the first communications device.
    [0030] A second communications device, wherein the second communications device comprises:
    a receiving module, configured to receive sidelink control information SCI sent by a first communications device, wherein the SCI is used to instruct the first communications device to send at least one channel state information-reference signal CSI-RS to the second communications device;
    the receiving module is further configured to receive, based on the SCI, the at least one CSI-RS sent by the first communications device; and
    a processing module, configured to determine that a beam corresponding to a CSI-RS with highest signal strength in the at least one CSI-RS is a beam for communication between the second communications device and the first communications device.
    [0031] The second communications device according to claim 30, further comprising:a sending module, configured to send feedback information to the first communications device, wherein the feedback information comprises at least one of an identifier of the beam corresponding to the CSI-RS with the highest signal strength and a resource identifier of the CSI-RS with the highest signal strength.
    [0032] The second communications device according to claim 30 or 31, wherein the SCI comprises at least one of a device identifier of the second communications device, a scheduling indication of the CSI-RS, and transmission information of the CSI-RS, and the transmission information of the CSI-RS comprises at least one of time-frequency resource information of the CSI-RS, a resource identifier of the CSI-RS, and a scrambling identity of the CSI-RS.
    [0033] The second communications device according to claim 31 or 32, wherein the SCI comprises a time offset K; andthe sending module is further configured to send, based on the time offset K, the feedback information to the first communications device in a Kth subframe after a subframe in which the CSI-RS is received, wherein K is an integer greater than or equal to 0.
    [0034] The second communications device according to claim 33, wherein the SCI comprises first indication information; andthe sending module is further configured to send, based on the first indication information, the feedback information to the first communications device on a time-frequency resource in the Kth subframe.
    [0035] The second communications device according to any one of claims 30 to 34, wherein the CSI-RS is further used for channel measurement; andthe processing module is further configured to determine, based on second indication information, that the CSI-RS is used for at least one of channel measurement and beam training.
    [0036] The second communications device according to any one of claims 30 to 35, wherein the SCI comprises configuration information of the CSI-RS, the configuration information of the CSI-RS comprises at least one of an occupied bandwidth, the scrambling identity, an antenna port, and signal density that are of the CSI-RS, and the configuration information of the CSI-RS is preconfigured by a base station and sent to the first communications device.
    [0037] A first communications device, wherein the first communications device comprises:
    a sending module, configured to send sidelink control information SCI to a second communications device, wherein the SCI is used to instruct the first communications device to send at least one channel state information-reference signal CSI-RS to the second communications device; and
    the sending module is further configured to send the at least one CSI-RS to the second communications device based on the SCI, wherein the at least one CSI-RS is used by the second communications device to determine to perform channel measurement.
    [0038] The first communications device according to claim 37, wherein the SCI comprises at least one of a device identifier of the second communications device, a scheduling indication of the CSI-RS, and transmission information of the CSI-RS, and the transmission information of the CSI-RS comprises at least one of time-frequency resource information of the CSI-RS, a resource identifier of the CSI-RS, and a scrambling identity of the CSI-RS.
    [0039] The first communications device according to claim 37 or 38, wherein the SCI comprises a time offset K, the time offset K is used to instruct the second communications device to send feedback information in a Kth subframe after a subframe in which the CSI-RS is received, and K is an integer greater than or equal to 0.
    [0040] The first communications device according to claim 39, wherein the SCI comprises first indication information, and the first indication information is used to instruct the second communications device to send the feedback information on a time-frequency resource in the Kth subframe.
    [0041] A second communications device, wherein the second communications device comprises:
    a receiving module, configured to receive sidelink control information SCI sent by a first communications device, wherein the SCI is used to instruct the first communications device to send at least one channel state information-reference signal CSI-RS to the second communications device;
    the receiving module is further configured to receive, based on the SCI, the at least one CSI-RS sent by the first communications device; and
    a processing module, configured to perform channel measurement based on the at least one CSI-RS.
    [0042] The second communications device according to claim 41, wherein the SCI comprises at least one of a device identifier of the second communications device, a scheduling indication of the CSI-RS, and transmission information of the CSI-RS, and the transmission information of the CSI-RS comprises at least one of time-frequency resource information of the CSI-RS, a resource identifier of the CSI-RS, and a scrambling identity of the CSI-RS.
    [0043] The second communications device according to claim 41 or 42, wherein the SCI comprises a time offset K; andthe receiving module is further configured to send, based on the time offset K, feedback information to the first communications device in a Kth subframe after a subframe in which the CSI-RS is received, wherein K is an integer greater than or equal to 0.
    [0044] The second communications device according to claim 42, wherein the SCI comprises first indication information; andthe receiving module is further configured to send, based on the first indication information, the feedback information to the first communications device on a time-frequency resource in the Kth subframe.
    [0045] A first communications device, comprising a memory, a communications bus, and a processor, wherein the memory is configured to store program code, and the processor is configured to invoke the program code, to perform the method according to any one of claims 1 to 7 and claims 15 to 18.
    [0046] A second communications device, comprising a memory, a communications bus, and a processor, wherein the memory is configured to store program code, and the processor is configured to invoke the program code, to perform the method according to any one of claims 8 to 14 and claims 19 to 22.
    [0047] A computer-readable storage medium, wherein the computer-readable storage medium stores an instruction, and when the instruction is run on a computer, the computer is enabled to perform the method according to any one of claims 1 to 22.
    [0048] A computer program product comprising an instruction, wherein when the computer program product is run on a computer, the computer is enabled to perform the method according to any one of claims 1 to 22.
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