WO2023274182A1 - Procédé et appareil d'envoi et de réception de données - Google Patents

Procédé et appareil d'envoi et de réception de données Download PDF

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Publication number
WO2023274182A1
WO2023274182A1 PCT/CN2022/101686 CN2022101686W WO2023274182A1 WO 2023274182 A1 WO2023274182 A1 WO 2023274182A1 CN 2022101686 W CN2022101686 W CN 2022101686W WO 2023274182 A1 WO2023274182 A1 WO 2023274182A1
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srs
multicast
terminal device
time
antenna port
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PCT/CN2022/101686
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English (en)
Chinese (zh)
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刘荣宽
向铮铮
卢磊
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华为技术有限公司
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Publication of WO2023274182A1 publication Critical patent/WO2023274182A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/121—Wireless traffic scheduling for groups of terminals or users

Definitions

  • the present application relates to the technical field of communications, and in particular to a data sending and receiving method and device.
  • the data transmission link between the user equipment (User Equipment, UE) and the base station is called the uplink (UE transmits data to the base station Information link) or downlink (a link for a base station to send information to a UE), and a link for transmitting data between UEs is called a sidelink (Sidelink, SL).
  • Sidelinks can usually be applied to vehicle-to-everything (V2X) scenarios, or direct-connected communication scenarios such as device-to-device (D2D).
  • V2X vehicle-to-everything
  • D2D device-to-device
  • the downlink and sidelink can support multicast and broadcast in addition to unicast.
  • beamforming or precoding technology can be used to generate directional beams by adjusting the phase, signal amplitude and transmission power of the transmitted signal, so as to expand signal coverage, improve edge throughput and suppress interference problems, etc.
  • the base station needs to obtain channel state information (Channel State Information, CSI) to perform beamforming or precoding technology on the downlink.
  • CSI Channel State Information
  • the UE can send a channel sounding reference signal (Sounding Reference Signal, SRS), and the base station can obtain the channel state information between the UE and the base station by using the channel mutuality through measurement and estimation.
  • the base station can send a reference signal (Reference Signal, RS) of channel state information (Channel State Information, CSI) to the UE, and the UE obtains the CSI by measuring the CSI-RS, and then sends a CSI report to the base station, so that the base station can report based on the CSI Obtain channel state information between the UE and the base station.
  • RS Reference Signal
  • RS Reference Signal
  • CSI Channel State Information
  • the sender device can send the same service data through Space Division Multiple Access (SDMA), but the transmit power of the signal is allocated to different UEs, and there is mutual interference between the transmit signals of different UEs , causing the transmission power of the signal to not be effectively utilized. Therefore, it is necessary to study a more efficient physical layer multicast technology to solve the problem of waste of transmission resources in multicast services.
  • SDMA Space Division Multiple Access
  • the present application provides a data sending and receiving method and device, which can reduce the waste of transmission resources in multicast services and effectively improve spectrum utilization.
  • a method for sending and receiving data is provided.
  • the method may be executed by a first device, or may be executed by a chip applied to the first device.
  • the following only takes the first device as an example for execution.
  • the method includes: the first device sends channel sounding reference signal SRS configuration information to at least one terminal device in the first multicast group, and the SRS configuration information indicates the first time-frequency resource used for sending the SRS, the sequence of the SRS and the configuration information used for sending the SRS.
  • the first device receives at least one SRS from at least one terminal device on the first time-frequency resource, and determines multicast channel state information based on the at least one SRS, wherein the time-frequency resources bearing at least one SRS are the same, and The sequence of at least one SRS is the same; the first device determines the physical layer multicast beamforming or precoding matrix according to the multicast channel state information; the first device sends to at least one terminal device according to the physical layer multicast beamforming or precoding matrix Multicast data.
  • the first device may configure SRS configuration information for at least one terminal device (for example, it may be multicast-specific SRS configuration information), at least one terminal device in the multicast group can send the same sequence of SRSs to the first device on the same time-frequency resource, and at least one SRS on the same time-frequency resource can be used by the sending side device.
  • SRS configuration information for example, it may be multicast-specific SRS configuration information
  • at least one terminal device in the multicast group can send the same sequence of SRSs to the first device on the same time-frequency resource, and at least one SRS on the same time-frequency resource can be used by the sending side device.
  • It is regarded as an integrated SRS, so as to realize the effective measurement of the multicast channel by the sending side device and obtain the channel state information of the multicast channel.
  • the first device can determine the physical layer multicast beamforming or precoding matrix according to the channel state information of the multicast channel, which is used to send multicast data to at least one terminal device in the first multicast group, which improves the physical layer group
  • the utilization rate of spectrum resources for multicast transmission can be minimized, and the waste of transmission resources in multicast services can be reduced as much as possible.
  • At least one SRS is transmitted through the same antenna port.
  • multiple terminal devices send SRSs to the first device from the same antenna ports, and at least one SRS is used by the first device to measure and estimate the multicast channel between the first device and multiple receiving side devices , so that at least one SRS sent by the same time-frequency resource and the same port can improve the effectiveness of multicast channel measurement and improve the accuracy of multicast channel measurement.
  • the method further includes: the first device receives at least one antenna port indication information from at least one terminal device, where the antenna port indication information is used to indicate the number of antenna ports of the corresponding terminal device, or, the corresponding terminal device's A set of antenna port indexes; the first device determines an antenna port for sending the SRS according to at least one antenna port indication information.
  • At least one terminal device reports its own antenna port indication information to the first device, for example, the number of antenna ports supported by each terminal device or the set of antenna port indexes, so that the first device can
  • the antenna port indication information of the antenna port determines the antenna port used to send the SRS, so that each terminal device uses the same antenna port to send the SRS, which improves the accuracy and flexibility of the multicast channel measurement.
  • the method further includes: the first device sends first control information to at least one terminal device according to the physical layer multicast beamforming or precoding matrix, and the first control information is used to indicate the timing of the multicast data.
  • the frequency resource, wherein the first control information further includes a group identifier of the first multicast group.
  • the first device may multicast and send the first control information to at least one terminal device according to the physical layer multicast beamforming or precoding matrix, for example
  • the first control information may be SCI or DCI, which is used to notify at least one terminal device of time-frequency resources for transmitting multicast data, so that the beam coverage of the first control information and the effectiveness of communication can be improved.
  • the first device does not need to separately send the first control information to at least one terminal device, which can effectively save signaling overhead, save communication resources, and improve the efficiency of the communication system.
  • the multicast data is carried on the second time-frequency resource, where the second time-frequency resource is the same as the frequency domain resource of the first time-frequency resource, or the frequency domain resource of the second time-frequency resource is the same as the frequency domain resource of the first time-frequency resource.
  • a subset of frequency domain resources of a time-frequency resource is carried on the second time-frequency resource, where the second time-frequency resource is the same as the frequency domain resource of the first time-frequency resource, or the frequency domain resource of the second time-frequency resource is the same as the frequency domain resource of the first time-frequency resource.
  • the first device may perform multicast channel measurement on the multicast channel bandwidth through at least one received SRS, and sending multicast data may occupy part or all of the measured bandwidth of the multicast channel, thereby improving
  • the effectiveness of multicast channel measurement and utilization is improved, the efficiency of multicast data transmission is improved, and the data transmission performance of the communication system is improved.
  • the first device is a network device, or the first device is a terminal device in the first multicast group.
  • the solution when the first device is a network device, the solution is applicable to downlink multicast channel measurement and downlink multicast data transmission; when the first device is a terminal device on the sending side in the first multicast group, This solution can also be applied to the multicast channel measurement of the side link and the transmission of the side multicast data.
  • the technical solution is more general and flexible, and improves the data transmission efficiency of the multicast communication, thereby improving the data transmission performance of the communication system.
  • the first device sends a piece of SRS configuration information to at least one terminal device, or the first device sends corresponding SRS configuration information to each of the at least one terminal device, and each terminal device corresponds to The SRS configuration information is the same.
  • the first device may send group-specific SRS configuration information corresponding to the first multicast group to at least one terminal device through a signaling, thereby effectively saving communication signaling. If the first device sends the same SRS configuration information to each of the at least one terminal device before forming a group through the first multicast, thereby improving the flexibility and realizability of the SRS configuration information.
  • a method for obtaining multicast channel state information is provided.
  • This method can be executed by the first terminal device, or can be executed by a chip applied to the first terminal device.
  • only the execution subject is the first terminal device.
  • the method includes: the first terminal device receives channel sounding reference signal SRS configuration information from the first device, and the SRS configuration information indicates a first time-frequency resource for sending SRS, a sequence of SRS and an antenna port for sending SRS; A terminal device sends a first SRS to a first device on a first time-frequency resource, the first terminal device belongs to a first multicast group, and the first time-frequency resource carries at least one message from at least one terminal device in the first multicast group One SRS, and the first SRS belongs to at least one SRS, and the at least one SRS is used for the first device to determine multicast channel state information; the first terminal device receives multicast data from the first device.
  • At least one SRS is transmitted through the same antenna port.
  • the method further includes: the first terminal device sends antenna port indication information to the first device, where the antenna port indication information is used to indicate the number of antenna ports of the first terminal device, or the antenna port number of the first terminal device A set of port indexes; the antenna port indication information is used by the first device to determine the antenna port used to send the SRS.
  • the method further includes: the first terminal device receives first control information from the first device, the first control information is used to indicate the time-frequency resource of the multicast data, wherein the first control information further includes The group identifier of the first multicast group, and the first control information are sent by the first device according to a physical layer multicast beamforming or a precoding matrix.
  • the multicast data is carried on the second time-frequency resource, where the second time-frequency resource is the same as the frequency domain resource of the first time-frequency resource, or the frequency domain resource of the second time-frequency resource is the same as the frequency domain resource of the first time-frequency resource.
  • a subset of frequency domain resources of a time-frequency resource is carried on the second time-frequency resource, where the second time-frequency resource is the same as the frequency domain resource of the first time-frequency resource, or the frequency domain resource of the second time-frequency resource is the same as the frequency domain resource of the first time-frequency resource.
  • the first device is a network device, or the first device is a terminal device in the first multicast group.
  • a method for acquiring multicast channel state information is provided.
  • the method may be executed by the first device, or may be executed by a chip applied to the first device.
  • the following only takes the first device as an example for execution.
  • the method includes: the first device sends at least one first configuration information to at least one terminal device in the first multicast group, the first configuration information is used to indicate the time-frequency resource of channel state information CSI report; the first device sends at least one terminal device The device sends a channel state information reference signal CSI-RS; the first device receives at least one CSI report from at least one terminal device; the first device determines a physical layer multicast beamforming or precoding matrix according to the at least one CSI report; the first device The multicast data is sent to at least one terminal device according to the physical layer multicast beamforming or the precoding matrix.
  • the first device can configure the first configuration information for at least one terminal device, that is, the multicast channel-specific CSI report configuration information, so that the first device can determine the channel state of the multicast channel between the first device and at least one terminal device according to the CSI reports fed back by different terminal devices on the time-frequency resources indicated by the first configuration information information.
  • the first device can determine a physical layer multicast beam attribute or a precoding matrix suitable for multicast transmission according to the channel state information of the multicast channel, and use it to send multicast data, thereby improving the utilization rate of spectrum resources for physical layer multicast transmission, The waste of transmission resources in the multicast service is reduced as much as possible.
  • the first configuration information includes a first time limit
  • the first configuration information is used to instruct at least one terminal device to send a CSI report within the first time limit.
  • the first configuration information may include the time domain constraint that the terminal device sends CSI, that is, the first time limit, so that the first device can restrict different terminal devices in the multicast group to be within the preset time constraint, Reporting the CSI report, it can be considered that the channel state change can be ignored within the first time limit, so that the first device can determine the multicast channel state information according to the channel state information reflected by multiple CSI reports.
  • the multicast channel state information can be more accurate, and the utilization rate of the multicast channel can be effectively improved .
  • the first configuration information is used to indicate a period and a starting time point of the time-frequency resource reported by the channel state information (CSI).
  • CSI channel state information
  • the first device may configure the manner in which the terminal device reports the CSI report to be periodic, then the first device may include the time domain constraint that the terminal device periodically sends the CSI report in the first configuration information, That is, the sending cycle and the starting time point, so that the first device can limit that different terminal devices in the multicast group can report the CSI report synchronously at the preset starting time, and report the CSI report at the same period, so that the first device
  • the multicast channel state information that can be determined according to the channel state information reflected by multiple CSI reports is more immediate and accurate, and effectively improves the utilization rate of the multicast channel.
  • the method further includes: the first device sends a control element MAC CE of the media access control layer to at least one terminal device, for instructing at least one terminal device to send a CSI report to the first device.
  • the first device may also configure the way the terminal device reports the CSI report as semi-static, that is, the first device sends a MAC CE to at least one terminal device to instruct the terminal device to send the CSI report to the first device. report, so as to improve the flexibility of the terminal device to report the CSI report.
  • the method further includes: the first device sends second control information to at least one terminal device, which is used to instruct at least one terminal device to send a CSI report and immediacy to the first device.
  • the manner in which the terminal device reports the CSI report may also be aperiodic, that is, the first device sends the second control information to at least one terminal device, for example, the second control information may specifically be SCI or DCI, and the second control The information may be used to instruct the terminal device to send the CSI report to the first device, thereby improving the flexibility and immediacy of reporting the CSI report by the terminal device.
  • the method further includes: the first device sends third control information to at least one terminal device according to the physical layer multicast beamforming or precoding matrix, and the third control information is used to indicate the timing of the multicast data. frequency resources, wherein the third control information further includes a group identifier of the first multicast group.
  • the first device may send third control information to at least one terminal device according to the physical layer multicast beamforming or precoding matrix, such as the third
  • the control information may specifically be SCI or DCI, and the third control information may be used to notify at least one terminal device of time-frequency resources for transmitting multicast data, thereby improving beam coverage and communication effectiveness of the third control information.
  • the first device does not need to individually multicast and send the third control information to at least one terminal device, which can effectively save signaling overhead, save communication resources, and improve the efficiency of the communication system.
  • the CSI-RS is borne on a first frequency domain resource
  • the multicast data is borne on a second frequency domain resource, where the second frequency domain resource is the same as the first frequency domain resource, or the second frequency domain resource
  • the resources are a subset of the first frequency domain resources.
  • the first device may perform multicast channel measurement on the multicast channel bandwidth by sending CSI-RS and receiving at least one CSI report, and sending multicast data may occupy the measured part of the multicast channel Or the entire bandwidth can obtain frequency domain diversity gain and improve the efficiency of multicast data transmission, thereby improving the data transmission performance of the communication system.
  • the first device is a network device, or the first device is a terminal device in the first multicast group.
  • the solution when the first device is a network device, the solution is applicable to downlink multicast channel measurement and downlink multicast data transmission; when the first device is a terminal device on the sending side in the first multicast group, This solution can also be applied to the multicast channel measurement of the side link and the transmission of the side multicast data.
  • the technical solution is more general and flexible, and improves the data transmission efficiency of the multicast communication, thereby improving the data transmission performance of the communication system.
  • the first device sends a piece of first configuration information to at least one terminal device, or the first device sends corresponding first configuration information to each of the at least one terminal device, and each terminal
  • the first configuration information corresponding to the devices is the same.
  • the first device may send configuration information of the CSI report corresponding to the first multicast group to at least one terminal device through a signaling, thereby effectively saving communication signaling. If the first device sends the same CSI report configuration information to each of the at least one terminal device before forming a group through the first multicast, thereby improving the flexibility and practicability of CSI report resource configuration.
  • a method for acquiring multicast channel state information is provided. This method can be executed by the first terminal device, or can be executed by a chip applied to the first terminal device. In the following, only the first terminal device is the subject of execution. as an example.
  • the method includes: the first terminal device receives first configuration information from the first device, the first configuration information is used to indicate the time-frequency resource of channel state information CSI report; the first terminal device receives the channel state information reference from the first device Signal CSI-RS; the first terminal device sends a first CSI report to the first device according to the CSI-RS, the first terminal device belongs to the first multicast group, and the time-frequency resource carrying the first CSI report also carries information from the first multicast group At least one CSI report of at least one terminal device in the group, and the first CSI belongs to the at least one CSI report, and the CSI report is used for the first device to determine multicast channel state information; the first terminal device receives the information from the first device multicast data.
  • the first configuration information includes a first time limit
  • the first configuration information is used to instruct the first terminal device to send the first CSI report within the first time limit.
  • the first configuration information is used to indicate a period and a starting time point of the time-frequency resource for the first terminal device to send the first CSI report.
  • the method further includes: the first terminal device receives a MAC CE from the control unit of the media access control layer of the first device; and the terminal device sends the first CSI report to the first device according to the MAC CE.
  • the method further includes: the first terminal device receiving second control information from the first device; and the terminal device sending the first CSI report to the first device according to the second control information.
  • the method further includes: the first terminal device receives third control information from the first device, the third control information is used to indicate the time-frequency resource of the multicast data, wherein the third control information further includes The group identifier of the first multicast group, and the third control information are sent by the first device according to the physical layer multicast beamforming or the precoding matrix.
  • the first CSI-RS is carried on a first frequency domain resource
  • the multicast data is carried on a second frequency domain resource, where the second frequency domain resource is the same as the first frequency domain resource, or, the second frequency domain resource is The frequency domain resource is a subset of the first frequency domain resource.
  • the first device is a network device, or the first device is a terminal device in the first multicast group.
  • a communication device which includes a sending module, a receiving module, and a processing module, wherein the sending module is configured to send channel sounding reference signal SRS configuration information to at least one terminal device in the first multicast group, and the SRS
  • the configuration information indicates the first time-frequency resource for sending SRS, the sequence of SRS and the antenna port for sending SRS;
  • the receiving module is used to receive at least one SRS from at least one terminal device on the first time-frequency resource, and based on At least one SRS determines multicast channel state information, wherein the time-frequency resources carrying at least one SRS are the same, and the sequence of at least one SRS is the same;
  • the processing module is used to determine the physical layer multicast beamforming or pre-set according to the multicast channel state information Coding matrix;
  • the sending module is further configured to send multicast data to at least one terminal device according to the physical layer multicast beamforming or precoding matrix.
  • At least one SRS is transmitted through the same antenna port.
  • the receiving module is further configured to receive at least one antenna port indication information from at least one terminal device, where the antenna port indication information is used to indicate the number of antenna ports of the corresponding terminal device, or the antenna port index of the corresponding terminal device A set; the processing module is further configured to determine an antenna port for sending the SRS according to at least one antenna port indication information.
  • the sending module is further configured to send first control information to at least one terminal device according to the physical layer multicast beamforming or precoding matrix, where the first control information is used to indicate the time-frequency resource of the multicast data, wherein, the first control information further includes a group identifier of the first multicast group.
  • the multicast data is carried on the second time-frequency resource, where the second time-frequency resource is the same as the frequency domain resource of the first time-frequency resource, or the frequency domain resource of the second time-frequency resource is the same as the frequency domain resource of the first time-frequency resource.
  • a subset of frequency domain resources of a time-frequency resource is carried on the second time-frequency resource, where the second time-frequency resource is the same as the frequency domain resource of the first time-frequency resource, or the frequency domain resource of the second time-frequency resource is the same as the frequency domain resource of the first time-frequency resource.
  • the communication device is a network device, or the communication device is a terminal device in the first multicast group. It may also be a chip applied to a network device or a terminal, or other combined devices having the functions of the above-mentioned network device or terminal device.
  • the receiving module can be a receiver, and can include an antenna and a radio frequency circuit, etc.
  • the processing module can be a processor
  • the sending module can be The transmitter may include an antenna and a radio frequency circuit, etc., wherein the receiver and the transmitter may be an integrated transceiver.
  • the receiving module may be a radio frequency unit
  • the processing module may be a processor
  • the sending module may be a radio frequency unit.
  • the receiving module may be an input interface of the chip system
  • the processing module may be a processor of the chip system, for example: a central processing unit (central processing unit, CPU), sending
  • the module may be an output interface of the chip system.
  • the chip system can be a system on chip (system on chip, SOC), or a baseband chip, etc., where the baseband chip can include a processor, a channel encoder, a digital signal processor, a modem, and an interface module.
  • the sending module is further configured to send a piece of SRS configuration information to at least one terminal device, or the sending module is further configured to send corresponding SRS configuration information to each of the at least one terminal device, each The SRS configuration information corresponding to each terminal device is the same.
  • a communication device includes a receiving module and a sending module, wherein the receiving module is configured to receive channel sounding reference signal SRS configuration information from the first device, and the SRS configuration information indicates the first device used to send the SRS.
  • the receiving module is configured to receive channel sounding reference signal SRS configuration information from the first device, and the SRS configuration information indicates the first device used to send the SRS.
  • the sending module is used to send the SRS to the first device on the first time-frequency resource, and the SRS is used by the first device to determine the first multicast according to at least one SRS
  • the multicast channel status information of the group; the receiving module is also used to receive the multicast data from the first device.
  • the SRS is sent through a preset antenna port, or the SRS is sent through an antenna port indicated in the SRS configuration information.
  • the sending module is further configured to send antenna port indication information to the first device, where the antenna port indication information is used to indicate the number of antenna ports of the communication device, or a set of antenna port indexes of the communication device;
  • the port indication information is used by the first device to determine an antenna port for sending the SRS.
  • the receiving module is further configured to receive first control information from the first device, the first control information is used to indicate the time-frequency resource of the multicast data, wherein the first control information also includes the first multicast The group identifier of the group, the first control information is sent by the first device according to the physical layer multicast beamforming or the precoding matrix.
  • the multicast data is carried on the second time-frequency resource, where the second time-frequency resource is the same as the frequency domain resource of the first time-frequency resource, or the frequency domain resource of the second time-frequency resource is the same as the frequency domain resource of the first time-frequency resource.
  • a subset of frequency domain resources of a time-frequency resource is carried on the second time-frequency resource, where the second time-frequency resource is the same as the frequency domain resource of the first time-frequency resource, or the frequency domain resource of the second time-frequency resource is the same as the frequency domain resource of the first time-frequency resource.
  • the first device is a network device, or the first device is a terminal device in the first multicast group. It may also be a chip applied to a network device or a terminal, or other combined devices having the functions of the above-mentioned network device or terminal device.
  • the receiving module can be a receiver, and can include an antenna and a radio frequency circuit, etc.
  • the processing module can be a processor
  • the sending module can be The transmitter may include an antenna and a radio frequency circuit, etc., wherein the receiver and the transmitter may be an integrated transceiver.
  • the receiving module may be a radio frequency unit
  • the processing module may be a processor
  • the sending module may be a radio frequency unit.
  • the receiving module may be an input interface of the chip system
  • the processing module may be a processor of the chip system, for example: a central processing unit (central processing unit, CPU), sending
  • the module may be an output interface of the chip system.
  • the chip system can be a system on chip (system on chip, SOC), or a baseband chip, etc., where the baseband chip can include a processor, a channel encoder, a digital signal processor, a modem, and an interface module.
  • a communication device in a seventh aspect, includes a sending module, a receiving module, and a processing module, wherein the sending module is configured to send at least one piece of first configuration information to at least one terminal device in the first multicast group, and the first The configuration information is used to indicate the time-frequency resource of the channel state information CSI report; the sending module is also used to send the channel state information reference signal CSI-RS to at least one terminal device; the receiving module is used to receive at least one CSI report from at least one terminal device The processing module is used to determine the physical layer multicast beamforming or precoding matrix according to at least one CSI report; the sending module is also used to send multicast data to at least one terminal device according to the physical layer multicast beamforming or precoding matrix.
  • the first configuration information includes a first time limit
  • the first configuration information is used to instruct at least one terminal device to send a CSI report within the first time limit.
  • the first configuration information is used to indicate a period and a starting time point of the time-frequency resource reported by the channel state information (CSI).
  • CSI channel state information
  • the sending module is further configured to send a control element MAC CE of the medium access control layer to at least one terminal device, and is used to instruct at least one terminal device to send a CSI report to the communication device.
  • the sending module is further configured to send second control information to at least one terminal device, for instructing at least one terminal device to send a CSI report to the communication apparatus.
  • the sending module is further configured to send third control information to at least one terminal device according to the physical layer multicast beamforming or precoding matrix, where the third control information is used to indicate the time-frequency resource of the multicast data, wherein, the third control information also includes the group identifier of the first multicast group.
  • the CSI-RS is borne on a first frequency domain resource
  • the multicast data is borne on a second frequency domain resource, where the second frequency domain resource is the same as the first frequency domain resource, or the second frequency domain resource
  • the resources are a subset of the first frequency domain resources.
  • the communication device is a network device, or the communication device is a terminal device in the first multicast group.
  • the sending module is configured to send a piece of first configuration information to at least one terminal device, or the sending module is configured to send corresponding first configuration information to each of the at least one terminal device, each The first configuration information corresponding to each terminal device is the same.
  • a communication device which includes a receiving module, a processing module, and a sending module, wherein the receiving module is used to receive first configuration information from a first device, and the first configuration information is used to indicate channel state information The time-frequency resource of the CSI report; the receiving module is also used to receive the channel state information reference signal CSI-RS from the first device; the processing module is used to send a CSI report to the first device according to the CSI-RS, and the CSI report is used for the first device Determine the multicast channel state information of the first multicast group according to at least one CSI report; the receiving module is also used to receive multicast data from the first device.
  • the receiving module is used to receive first configuration information from a first device, and the first configuration information is used to indicate channel state information The time-frequency resource of the CSI report; the receiving module is also used to receive the channel state information reference signal CSI-RS from the first device; the processing module is used to send a CSI report to the first device according to the CSI-RS, and the CSI report is used
  • the first configuration information includes a first time limit
  • the first configuration information is used to instruct the communication device to send the CSI report within the first time limit.
  • the first configuration information is used to indicate the period and the starting time point of the time-frequency resource for sending the CSI report by the communication device.
  • the receiving module is further configured to receive a control unit MAC CE from the media access control layer of the first device; the sending module is further configured to send a CSI report to the first device according to the MAC CE.
  • the receiving module is further configured to receive second control information from the first device; the sending module is further configured to send the second control information to the first device a CSI report.
  • the receiving module is further configured to receive third control information from the first device, the third control information is used to indicate the time-frequency resource of the multicast data, wherein the third control information also includes the first multicast The group identifier of the group, and the third control information is sent by the first device according to the physical layer multicast beamforming or the precoding matrix.
  • the CSI-RS is borne on a first frequency domain resource
  • the multicast data is borne on a second frequency domain resource, where the second frequency domain resource is the same as the first frequency domain resource, or the second frequency domain resource
  • the resources are a subset of the first frequency domain resources.
  • the first device is a network device, or the first device is a terminal device in the first multicast group.
  • a communication device which includes a processor and a communication interface; the communication interface is used to communicate with modules other than the communication device, and the processor is used to run computer programs or instructions to realize The method as described in any one of the above first aspects, or to implement the method as described in any one of the above third aspects.
  • a communication device which includes: a processor and a communication interface; the communication interface is used to communicate with modules other than the communication device, and the processor is used to run computer programs or instructions to Implement the method as described in any one of the above-mentioned second aspects, or, to realize the method as described in any one of the above-mentioned fourth aspects.
  • a computer-readable storage medium wherein the computer-readable storage medium includes computer program instructions, and when the computer program instructions are run on a communication device, the communication device executes The method according to any one of the above first aspect, or, the communication device executes the method according to any one of the above third aspect.
  • a computer-readable storage medium characterized in that the computer-readable storage medium includes a computer program, and when the computer program is run on a computer, the computer executes the above-mentioned second The method according to any one of the above aspects, or, the computer executes the method according to any one of the above fourth aspects.
  • a computer program product is provided.
  • the communication device executes the method described in any one of the first aspect or the third aspect.
  • a computer program product is provided.
  • the communication device executes the method described in any one of the above-mentioned second aspect or the fourth aspect.
  • a fifteenth aspect provides a communication system, the communication system includes the communication device as described in the fifth aspect, and the communication device as described in the sixth claim.
  • a sixteenth aspect provides a communication system, the communication system comprising the communication device as described in the seventh aspect and the communication device as described in the eighth aspect.
  • any communication device, computer-readable storage medium, computer program product, and communication system provided above can be implemented by the corresponding method provided above, and therefore, the beneficial effects it can achieve can be achieved by With reference to the beneficial effects in the corresponding method provided above, details will not be repeated here.
  • FIG. 1 is a system architecture diagram of a communication system provided by an embodiment of the present application
  • FIG. 2 is a system architecture diagram of a communication device provided in an embodiment of the present application.
  • Fig. 3-Fig. 7 are schematic flow diagrams 1 to 5 of a method for obtaining multicast channel state information provided by the embodiment of the present application;
  • FIG. 8 is a schematic structural diagram of a communication device provided by an embodiment of the present application.
  • FIG. 9 is a schematic structural diagram of another communication device provided by an embodiment of the present application.
  • the technical solutions provided in the embodiments of the present application can be used in any communication system supporting sidelink communication, and the communication system can be a 3rd generation partnership project (3rd generation partnership project, 3GPP) communication system, for example, a long-term evolution (long term term evolution (LTE) system, and can be used for the fifth generation (5th generation, 5G) mobile communication system, new radio (new radio, NR) system, vehicle-to-everything (V2X) system and other
  • the next generation communication system may also be a non-3GPP communication system without limitation.
  • FIG. 1 uses FIG. 1 as an example to describe the method provided in the embodiment of the present application.
  • FIG. 1 shows a schematic diagram of an implementation environment of a communication system provided by an embodiment of the present application.
  • a communication system which may include: at least two terminal devices, the at least two terminal devices are in a multicast group, for example, the first multicast The group may include UE1 and UE2.
  • the communication system may further include at least one network device, and the network device may send multicast data to at least two terminal devices.
  • the communication system may also include a terminal device, and the terminal device may also send multicast data to at least two terminal devices UE1 and UE2.
  • the communication system may also include a vehicle UE3.
  • the Uu port can be used for communication between the terminal device and the network device
  • the PC5 port can be used for the SL communication between the terminal device and the terminal device.
  • wireless communication may also be referred to as “communication” for short
  • communication may also be described as "data transmission", “information transmission” or “transmission”.
  • the data communication link that the terminal equipment transmits to the network equipment is called an uplink (Uplink, UL), and the data communication link that the network equipment transmits to the terminal equipment is called a downlink (Downlink, DL).
  • the device can send multicast data to at least two terminal devices UE1 and UE2 through the Uu interface.
  • the terminal equipment UE3 can send multicast data to at least two terminal equipment UE1 and UE2 through the PC5 port, wherein the terminal equipment UE3 can be used as the terminal equipment of the sending end in the multicast group, and the terminal equipment UE1 and UE2 can be used as the terminal equipment in the multicast group. terminal equipment at the receiving end.
  • the source end when UE1 and UE2 send the same service request to the same source end (such as a network device, or a terminal device such as UE3), the source end sends the service data to the physical layer of the source end according to the service request, and the source end Send the same service data to UE1 and UE2 through the physical layer.
  • the same service data can be called multicast data of the physical layer.
  • a network device may be any device with a wireless transceiver function. Including but not limited to: evolved base station (NodeB or eNB or e-NodeB, evolutional Node B) in the long-term evolution (Long Term Evolution, LTE) system, base station (gNodeB or gNB) or transmission receiving point in NR /transmission reception point, TRP), 3GPP subsequent evolution base station, access node in WiFi system, wireless relay node, wireless backhaul node, etc.
  • the base station can be: a macro base station, a micro base station, a pico base station, a small station, a relay station, or a balloon station, etc.
  • Multiple base stations may support the aforementioned networks of the same technology, or may support the aforementioned networks of different technologies.
  • a base station may contain one or more co-sited or non-co-sited TRPs.
  • the network device may also be a wireless controller, a centralized unit (centralized unit, CU), and/or a distributed unit (distributed unit, DU) in a cloud radio access network (cloud radio access network, CRAN) scenario.
  • the network device can also be a server, a wearable device, or a vehicle-mounted device, etc.
  • a network device is used as an example for description.
  • the multiple network devices may be base stations of the same type, or base stations of different types.
  • the base station can communicate with the terminal equipment, and can also communicate with the terminal equipment through the relay station.
  • a terminal device can communicate with multiple base stations of different technologies. For example, a terminal device can communicate with a base station supporting an LTE network, or a base station supporting a 5G network, and can also support dual connections with a base station of an LTE network and a base station of a 5G network .
  • Terminal equipment is a device with wireless transceiver function, which can be deployed on land, including indoor or outdoor, handheld, wearable or vehicle-mounted; it can also be deployed on water (such as ships, etc.); it can also be deployed in the air (such as aircraft, balloons and satellites, etc.).
  • the terminal device may be a mobile phone, a tablet computer (Pad), a computer with a wireless transceiver function, a virtual reality (virtual reality, VR) terminal device, an augmented reality (augmented reality, AR) terminal device, an industrial control ( Wireless terminals in industrial control, vehicle-mounted terminal equipment, wireless terminals in self driving, wireless terminals in remote medical, wireless terminals in smart grid, transportation security Safety), wireless terminals in smart city, wireless terminals in smart home, wearable terminal devices, etc.
  • the embodiments of the present application do not limit the application scenarios.
  • Terminal equipment can sometimes be called user equipment UE, access terminal equipment, vehicle-mounted terminal, industrial control terminal, UE unit, UE station, mobile station, mobile station, remote station, remote terminal equipment, mobile equipment, UE terminal equipment, terminal device, wireless communication device, UE proxy or UE device, etc. Terminal equipment can also be fixed or mobile.
  • FIG. 1 is only an exemplary drawing, and the number of devices included in FIG. 1 is not limited, and besides the devices shown in FIG. 1 , the communication architecture may further include other devices.
  • the names of each device in FIG. 1 are not limited, and besides the names shown in FIG. 1 , each device can be named by other names without limitation.
  • each network element shown in FIG. 1 may adopt the composition structure shown in FIG. 2 or include the components shown in FIG. 2 .
  • Fig. 2 is a schematic structural diagram of a communication device 200 provided by the embodiment of the present application.
  • the communication device 200 can be a terminal device or a chip in the terminal device Or a system on a chip.
  • the communication device 200 may be a network device or a chip or a system on a chip in the network device.
  • the communication device 200 may include a processor 201 , a communication line 202 and a communication interface 203 . Further, the communication device 200 may further include a memory 204 . Wherein, the processor 201 , the memory 204 and the communication interface 203 may be connected through a communication line 202 .
  • the processor 201 can be a central processing unit (Central Processing Unit, CPU), a general-purpose processor, a network processor (Network Processor, NP), a digital signal processor (Digital Signal Processing, DSP), a microprocessor, a microcontroller , programmable logic devices, or any combination of them.
  • the processor 201 may also be other devices with processing functions, such as circuits, devices, or software modules.
  • the communication line 202 is used to transmit information between the components included in the communication device 200 .
  • the communication interface 203 is used for communicating with other devices or other communication networks.
  • the other communication network may be Ethernet, radio access network (Radio Access Network, RAN), wireless local area network (Wireless Local Area Networks, WLAN), etc.
  • the communication interface 203 may be an interface circuit, a pin, a radio frequency module, a transceiver or any device capable of realizing communication.
  • the memory 204 is used for storing instructions.
  • the instruction may be a computer program.
  • the memory 204 can be a read-only memory (Read-only Memory, ROM) or other types of static storage devices that can store static information and/or instructions, and can also be a random access memory (Random Access Memory, RAM) or can store Other types of dynamic storage devices that store information and/or instructions can also be Electrically Erasable Programmable read-only Memory (EEPROM), Compact Cisc read-only Memory (CD- ROM) or other optical disc storage, optical disc storage, magnetic disk storage media, or other magnetic storage devices, including compact discs, laser discs, optical discs, digital versatile discs, or Blu-ray discs.
  • EEPROM Electrically Erasable Programmable read-only Memory
  • CD- ROM Compact Cisc read-only Memory
  • CD- ROM Compact Cisc read-only Memory
  • magnetic disk storage media or other magnetic storage devices, including compact discs, laser discs, optical discs, digital versatile discs, or Blu-ray discs.
  • the memory 204 may exist independently of the processor 201 or may be integrated with the processor 201 .
  • the memory 204 may be used to store instructions or program codes or some data, and the like.
  • the memory 204 may be located in the communication device 200 or outside the communication device 200, without limitation.
  • the processor 201 is configured to execute instructions stored in the memory 204, so as to implement the methods provided in the following embodiments of the present application.
  • the processor 201 may include one or more CPUs, such as CPU0 and CPU1 in FIG. 2 .
  • the communications apparatus 200 includes multiple processors, for example, in addition to the processor 201 in FIG. 2 , it may further include a processor 207 .
  • the communication apparatus 200 further includes an output device 205 and an input device 206 .
  • the input device 206 is a device such as a keyboard, a mouse, a microphone, or a joystick
  • the output device 205 is a device such as a display screen and a speaker.
  • the communication device 200 may be a wearable device, a desktop computer, a portable computer, a network server, a mobile phone, a tablet computer, a wireless terminal, an embedded device, a chip system or a device having a structure similar to that shown in FIG. 2 .
  • the composition structure shown in FIG. 2 does not constitute a limitation to the communication device.
  • the communication device may include more or less components than those shown in the illustration, or combine certain components , or different component arrangements.
  • system-on-a-chip may be composed of chips, or may include chips and other discrete devices.
  • the above-mentioned device 200 may be a system-on-a-chip, and the system-on-a-chip may at least include one or more processors and transceiver circuits, as shown in FIG. Executed in multiple processors, so that the system-on-a-chip implements the method of the present application.
  • actions, terms, etc. involved in various embodiments of the present application may refer to each other without limitation.
  • the names of messages exchanged between various devices or the names of parameters in messages are just examples, and other names may also be used in specific implementations, which are not limited.
  • each device in the following embodiments may have the components shown in FIG. 2 .
  • the actions and terms involved in the various embodiments of the present application may refer to each other without limitation.
  • the names of messages exchanged between various devices or the names of parameters in messages are just examples, and other names may also be used in specific implementations, which are not limited.
  • a data sending and receiving method provided in an embodiment of the present application.
  • the method can be applied between the first device and at least one terminal device.
  • the first device may be a network device or a terminal device.
  • the method may include:
  • the first device sends SRS configuration information to at least one terminal device in the first multicast group, where the SRS configuration information indicates a first time-frequency resource used for sending the SRS, a sequence of the SRS, and an antenna port used for sending the SRS.
  • the at least one terminal device receives the SRS configuration information from the first device.
  • the configuration information of the first device may be a group-specific SRS (Group Specific SRS) configuration information, that is, the configuration information of the SRS used to determine the state of the multicast channel, and the specific first device is the first multicast group
  • the SRS configuration information sent by at least one terminal device in the multicast group may have the same content, that is, the first device configures group-specific SRS configuration information for the terminal devices in the first multicast group, and the transmission indicated in the group-specific SRS configuration information
  • the time-frequency resources of the SRS, the SRS sequence, and the corresponding antenna ports for sending the SRS are all the same.
  • the multicast channel described in this application can be used for a sending device to transmit multicast data to at least one receiving device in the same multicast group. That is to say, the physical layer channel through which the sending side device sends multicast specific data to at least one receiving side device may be referred to as a multicast channel.
  • the sending side device scrambles the multicast data with the multicast identifier and sends the multicast data on the multicast channel
  • the terminal devices in the multicast group can receive the multicast data on the same time-frequency resource, and communicate with each other There is no interference between.
  • the at least one terminal device in the multicast group is configured to send at least one SRS to the sending device on the same time-frequency resource
  • the at least one SRS can be regarded as an integrated SRS on the multicast channel by the sending device
  • the sending side device determines the channel state of the multicast channel according to the integrated SRS.
  • the SRS configuration information in the embodiment of the present application may specifically be the configuration information corresponding to the group-specific SRS, which is used to instruct at least one terminal device in the multicast group to send the configuration information of the SRS.
  • the group-specific SRS configuration information may include time domain configuration parameters, frequency domain configuration parameters, port configuration parameters, and SRS sequence configuration parameters.
  • the time-domain configuration parameters and frequency-domain configuration parameters included in the SRS configuration information can be specifically used to indicate the first time-frequency resource, that is, it means that the group-specific SRS sent by at least one terminal device in the first multicast group can be carried on the first time-frequency resource.
  • the SRS configuration information may also include an antenna port for sending the SRS, which means that at least one terminal device in the first multicast group can send the group-specific SRS through the antenna port indicated in the SRS configuration information.
  • the SRS configuration information may also include a sequence for instructing at least one terminal device to send the SRS.
  • the SRS configuration information may include an initial sequence, which is used to instruct at least one terminal device in the corresponding first multicast group to generate a sequence at a time-frequency resource position for sending a reference signal. Since the first device configures the same initial sequence for at least one terminal device in the first multicast group, in the subsequent step 302, the sequence of the SRS sent by at least one terminal device in the first multicast group is the same of.
  • the base station or other network equipment may configure a corresponding wireless network temporary identifier (RNTI Radio Network Tempory) for each terminal device of the above-mentioned first multicast group Identity, RNTI), the RNTI is unique, and is used to identify the terminal device in the communication system.
  • RNTI wireless network temporary identifier
  • the base station or other network equipment may configure a corresponding group identifier for each terminal device of the first multicast group, so as to identify the first multicast group in the communication system.
  • UE1 corresponds to Group1
  • UE2 also corresponds to Group1.
  • the group identifier may specifically be a group RNTI (Group RNTI), that is, the RNTI is used as a distinction between different multicast groups.
  • Group RNTI can be specifically represented by X bits. This is not specifically limited in the embodiments of the present application.
  • the first device may send one piece of SRS configuration information to at least one terminal device.
  • the SRS configuration information may be carried in a radio resource control (Radio Resource Control, RRC) message, that is, the network device may add group-specific SRS configuration information in the RRC message indicates the domain.
  • RRC Radio Resource Control
  • the network device may send the RRC message to at least one terminal device through a downlink multicast channel, which is used to indicate the SRS configuration information corresponding to the first multicast group.
  • the SRS configuration information may be carried on the PC5 In the RRC message. That is, the sending UE can add the indication field of the group-specific SRS configuration information in the PC5 RRC message.
  • the sending UE may send the PC5 RRC message to at least one terminal device through a sidelink multicast channel, to indicate the SRS configuration information corresponding to the first multicast group.
  • the first device can send group-specific SRS configuration information corresponding to the first multicast group to at least one terminal device through a single signaling, so that communication signaling can be effectively saved.
  • the first device may respectively send corresponding SRS configuration information to each of the at least one terminal device.
  • the network device may respectively send a corresponding RRC message to each of the at least one terminal device.
  • the network device sends RRC1 to UE1, and the RRC1 includes SRS configuration information; the network device sends RRC2 to UE2, and the RRC2 includes SRS configuration information.
  • the SRS configuration information corresponding to each terminal device such as UE1 and UE2 is the same.
  • the sending UE may respectively send at least one terminal device Each end device in the device sends a corresponding PC5 RRC message.
  • the sending UE sends PC5 RRC1 to the receiving UE1, and the PC5 RRC1 includes SRS configuration information; the sending UE sends PC5 RRC2 to the receiving UE2, and the PC5 RRC2 includes SRS configuration information.
  • the SRS configuration information corresponding to each receiving terminal device is the same.
  • the first device may send group-specific SRS configuration information corresponding to the first multicast group to N terminal devices through N signaling, where N may be greater than A positive integer of 1.
  • Each terminal device in the first multicast group sends an SRS to the first device on the first time-frequency resource.
  • the at least one terminal device in the first multicast group After at least one terminal device in the first multicast group successfully receives the group-specific SRS configuration information from the first device, the at least one terminal device can use the same time-frequency resource (the first time-frequency resource) according to the SRS configuration information ) to send an SRS to the first device.
  • the first device receives at least one SRS from at least one terminal device.
  • At least one terminal device may send an SRS to the first device on the first time-frequency resource indicated in the SRS configuration information.
  • the port through which at least one terminal device transmits the SRS is the same, that is, the number of antenna ports through which the at least one terminal device transmits the SRS to the first device and the corresponding antenna port numbers are the same.
  • the terminal device may determine the number of antenna ports for sending SRS according to a certain threshold according to pre-agreement, or determine the number of antenna ports for sending SRS according to a parameter of a certain antenna port.
  • the threshold corresponding to the number of ports for the terminal device to send the group-specific SRS is 2, and the terminal device can send the SRS through ports port 1 and port 2.
  • the port index for the terminal device to send the group-specific SRS is nrofSRS-Ports. According to the index nrofSRS-Ports, it can be determined that the port corresponding to the index is port 1, and the terminal device can send SRS through this port 1.
  • the terminal device may report antenna port indication information to the first device in advance, and the antenna port indication information may be used to indicate the number of antenna ports of the corresponding terminal device, or the antenna port indication information may be used to indicate A collection of antenna port indices corresponding to terminal devices.
  • the terminal device reports the antenna port indication information to the first device, specifically before step 301, for the first device to determine the antenna port used to send the SRS according to at least one antenna port indication information reported by at least one terminal device , so as to determine the SRS configuration information.
  • UE1 and UE2 may respectively report respective antenna port indication information to the network device, where the antenna port indication information includes the number of antenna ports.
  • the number of antenna ports may be the maximum number of antenna ports that the UE1 or UE2 can support. Therefore, the network device can determine the number of antenna ports used to send the SRS in the Group Specific SRS configuration information according to the number of antenna ports reported by UE1 and UE2.
  • the number of antenna ports of the SRS in the Group Specific SRS configuration information determined by the network device may be A1 and A2
  • the number of antenna ports of the SRS may be A2.
  • UE1 and UE2 respectively report respective antenna port indication information to the network device, where the antenna port indication information includes a maximum set of antenna ports that UE1 or UE2 can support. Therefore, the network device can determine the antenna port set of the SRS in the Group Specific SRS configuration information according to the antenna port sets reported by UE1 and UE2 respectively.
  • the maximum antenna port set reported by UE1 to the network device is S1, and the antenna port set S1 may include one or more antenna ports supported by UE1; the maximum antenna port set reported by UE2 to the network device is S2, and the antenna port set S2 One or more antenna ports supported by UE2 may be included.
  • the antenna port set of the SRS in the Group Specific SRS configuration information determined by the network device is the intersection S of S1 and S2.
  • the antenna port set S may include one or more antenna ports supported by both UE1 and UE2.
  • the first device determines multicast channel state information according to at least one SRS.
  • the time-frequency resources bearing at least one SRS are the same, and the sequence of the at least one SRS is the same.
  • the first device may receive at least one SRS from at least one terminal device on the first time-frequency resource.
  • the time domain resource for at least one terminal device to send SRS there is a certain deviation between the time domain resource for at least one terminal device to send SRS and the time domain resource for the first device to receive SRS, which is ignored in the embodiment of the present application. , but it does not mean that there is no delay in actual transmission.
  • the first device may perform channel measurement and estimation based on at least one SRS according to channel mutuality, and obtain multicast channel state information between the first device and the terminal device.
  • the uplink and downlink in the communication system can be transmitted in different time domains of the same frequency domain resource, so within a relatively short time (coherence time of channel propagation), the uplink can be considered as It is the same as the channel fading experienced by the downlink transmission signal, that is, channel reciprocity.
  • the multicast channel state information in the embodiment of the present application refers to the channel state information of the multicast channel between a sending side device (which may be a network device or a terminal device) and multiple receiving side devices, and the multicast channel It is used for the sending device to transmit multicast data to multiple receiving devices.
  • the multicast channel state information is the state information of a specific multicast channel, which is different from the existing channel state information between a sending device and a receiving device.
  • the algorithm for the first device to determine the state information of the multicast channel according to at least one SRS may be implemented by referring to related technologies, which will not be described in detail in this application.
  • the first device can comprehensively perform channel measurement and estimation based on the SRS sent by multiple terminal devices. Therefore, the signal power of the SRS is higher, which is beneficial to the accuracy of the multicast channel measurement by the first device. Improve communication quality.
  • the first device determines a physical layer multicast beamforming or a precoding matrix according to the multicast channel state information.
  • the steps performed by the first device may be completed in the same step, for example, the first device may determine a physical layer multicast beamforming or a precoding matrix according to at least one SRS. Alternatively, the first device may execute it sequentially. For example, the first device first executes step 303 to obtain the multicast channel state information, and then executes step 304 to obtain the physical layer multicast beamforming or precoding matrix. This application is not limited to this.
  • beamforming technology is a signal preprocessing technology based on antenna arrays, which can also be called beamforming or spatial filtering technology, and is a signal processing technology that uses sensor arrays to send and receive signals in a directional manner.
  • the beamforming technology is applied to the data transmitting end, that is, the transmitting end can adjust the parameters of the basic unit of the transmitting antenna phase array so that the transmitting signals at certain angles can obtain constructive interference, while The transmission signals at other angles obtain destructive interference, thereby generating a directional transmission beam, which is sent to a specific user, and obtains obvious array gain.
  • a beamforming set may be defined, and the beamforming set may include multiple coefficient matrices or vectors for beamforming or spatial filtering. Specifically, different beams in the beamforming set and coefficient matrices or vectors corresponding to the beams can be distinguished through index values.
  • the precoding technology can preprocess the signal to be transmitted through the baseband to generate a precoding matrix.
  • the sender can allocate limited transmit power to data streams that can be effectively transmitted according to the number of parallel transmission streams that the channel can support, so that the transmit signal can be sent to a specific user in a more directional manner, avoiding the transmission power waste.
  • the algorithm for the first device to determine the multicast beamforming or precoding matrix according to the state information of the multicast channel may be implemented by referring to related technologies, which is not specifically limited in this application.
  • the first device sends multicast data to at least one terminal device according to physical layer multicast beamforming or a precoding matrix.
  • the multicast data may be carried on the second time-frequency resource, and the second time-frequency resource is the same as the frequency domain resource of the first time-frequency resource, or the frequency domain resource of the second time-frequency resource is A subset of frequency domain resources of the first time-frequency resource.
  • the location of the frequency domain resource for sending multicast data may be the same as that of the frequency domain resource for sending SRS.
  • the frequency domain resource for sending multicast data may be a subset of the frequency domain resource for sending SRS.
  • the first device is the network device shown in FIG. 1 , and the network device sends multicast data to UE1 and UE2 by using physical layer multicast beamforming or precoding matrix.
  • the frequency domain resource for transmitting multicast data is located in the downlink bandwidth part (Bandwidth Part, BWP) of UE1, and is also located in the downlink BWP of UE2.
  • the first device may perform multicast channel measurement on the multicast channel bandwidth by sending SRS, and sending multicast data may occupy part or all of the measured bandwidth of the multicast channel, thereby improving the bandwidth of the multicast channel.
  • the effectiveness of multicast channel heterogeneity utilization improves the efficiency of multicast data transmission, thereby improving the data transmission performance of the communication system.
  • the first device corresponds to the first multicast group and the second multicast group.
  • the first multicast group includes UE1 and UE2
  • the second multicast group includes UE3 and UE4.
  • the first device may use a physical layer multicast beam or a precoding matrix to send the first multicast data to UE1 and UE2 in the first multicast group.
  • the first device may use another physical layer multicast beam or another precoding to send the second multicast data to UE3 and UE4 in the second multicast group.
  • the implementation method of the present application may further include: the first device may send first control information to at least one terminal device, and the first control information may be used to indicate a time-frequency resource location for transmitting multicast data.
  • the sending of the first control information by the first device to at least one terminal device may occur before step 305 in the foregoing implementation manner, and is used to indicate to at least one terminal device the time-frequency resource for the first device to send multicast data. Therefore, after step 305, at least one terminal device can receive the multicast data from the first device according to the time-frequency resource position indicated by the at least one terminal device.
  • the first device may send the first control information to at least one terminal device according to physical layer multicast beamforming or a precoding matrix. That is, the first device sends the first control information to at least one terminal device by using the physical layer multicast beamforming or the precoding matrix determined in step 304 above.
  • the first device may multicast and send the first control information to at least one terminal device according to the physical layer multicast beamforming or precoding matrix, for example
  • the first control information may be SCI or DCI, which is used to notify at least one terminal device of time-frequency resources for transmitting multicast data, so that the beam coverage of the first control information and the effectiveness of communication can be improved.
  • the first device does not need to separately send the first control information to at least one terminal device, which can effectively save signaling overhead, save communication resources, and improve the efficiency of the communication system.
  • the first device may also send first control information to at least one terminal device respectively, so as to instruct the terminal device how to receive or decode the multicast data.
  • the first device may send the first control information to UE1, and in addition, the second device also sends the first control information to UE2.
  • UE1 and UE2 correspond to the same third control information.
  • the present application will respectively introduce the implementation manners of the present application in detail under different situations where the first device is a network device or the first device is a terminal device.
  • the first control information may specifically be downlink control information (Downlink Control Information, DCI).
  • DCI Downlink Control Information
  • the network device may send DCI to at least one terminal device according to physical layer multicast beamforming or a precoding matrix.
  • a network device sends DCI to UE1 and UE2 through a physical layer multicast beam.
  • the DCI transmitted by the multicast may be carried on a physical downlink control channel (Physical Downlink Control Channel, PDCCH).
  • PDCCH Physical Downlink Control Channel
  • the DCI of the multicast transmission may include the Group ID of the first multicast group.
  • the network device can indicate the group identifier in the DCI in a display manner, for example, the network device can add a group identifier indication field in the DCI, for example, use Y bits in the DCI to indicate the group identifier, where Y can be a natural number .
  • the network device may indicate the group identifier implicitly, that is, the DCI transmitted by the multicast may be scrambled with the Group RNTI. Therefore, only the receiving device corresponding to the Group RNTI can successfully decode the DCI and obtain the data therein.
  • the DCI of the multicast transmission may also include an indication field of a Modulation and Coding Scheme (MCS), indicating a multicast transmission MCS.
  • MCS Modulation and Coding Scheme
  • the network device may also send DCI to at least one terminal device respectively, for instructing the terminal device how to receive or decode the multicast data.
  • step 305 is executed, that is, the network device can send multicast data to at least one terminal device according to the physical layer multicast beamforming or precoding matrix, wherein the multicast data can be carried on a physical downlink shared channel (Physical Downlink Shared CHannel, PDSCH ).
  • PDSCH Physical Downlink Shared CHannel
  • the network device sends DCI to UE1 to instruct UE1 how to receive or decode PDSCH; in addition, the network device sends DCI to UE2 to instruct UE2 how to receive or decode PDSCH.
  • the DCI sent by the network device to at least one terminal device may also include the Group ID of the first multicast group.
  • the network device may indicate the group identifier in the DCI in the aforementioned, explicit or hidden manner, and details of the specific indication manner will not be repeated here.
  • the DCI sent by the network device to at least one terminal device may further include the MCS.
  • the network device may send downlink multicast data to at least one terminal device, such as UE1 and UE2, according to the determined physical layer multicast beam property or precoding matrix.
  • the frequency domain resource for the network device to transmit the downlink multicast data may be located in the downlink BWP of UE1 and also in the downlink BWP of UE2.
  • the frequency domain resource position of the downlink BWP for the network device to transmit the downlink multicast data is the same as the frequency domain resource position of the uplink BWP for at least one terminal device to send the SRS.
  • the frequency domain resource position of the downlink BWP for the network device to transmit the downlink multicast data is a subset of the frequency domain resources of the uplink BWP for at least one terminal device to send the SRS.
  • the first device is a sending-side device that can be used to send multicast data on a sidelink in the first multicast, and is referred to as sending UE for short.
  • sending UE for short.
  • UE3 as shown in FIG. 1 may be used.
  • the first control information may specifically be sidelink control information (Sidelink Control Information, SCI).
  • SCI Sidelink Control Information
  • the sending UE may send the SCI to at least one terminal device according to physical layer multicast beamforming or a precoding matrix.
  • UE3 which is the sending UE, may send an SCI to UE1 and UE2 through a physical layer multicast beam, so as to save energy and transmit signaling.
  • the SCI of the multicast transmission may be carried on a physical sidelink control channel (Physical Sidelink Control Channel, PSCCH).
  • PSCCH Physical Sidelink Control Channel
  • the sending UE may also send the SCI to at least one terminal device respectively, for instructing the terminal device how to receive or decode the multicast data.
  • the sending UE may send multicast data to at least one terminal device according to the physical layer multicast beamforming or precoding matrix, and the multicast data may be carried on the physical side link shared channel ( Physical Sidelink Shared CHannel, PSSCH).
  • PSSCH Physical Sidelink Shared CHannel
  • the above SCI may also include the Group ID of the first multicast group and the MCS indication.
  • the Group ID of the first multicast group may also include the Group ID of the first multicast group and the MCS indication.
  • the first device can configure group-specific SRS configuration information for multiple terminal devices, and at least one terminal device in the multicast group can send the same sequence of SRSs to the first device on the same time-frequency resource , the at least one SRS on the same time-frequency resource can be regarded as an integrated SRS for the sending side device, so as to realize the effective measurement of the multicast channel by the sending side device and obtain the channel state information of the multicast channel.
  • the first device can determine the physical layer multicast beamforming or precoding matrix according to the channel state information of the multicast channel, which is used to send multicast data to at least one terminal device in the first multicast group, which improves the physical layer group
  • the utilization rate of spectrum resources for multicast transmission can be minimized, and the waste of transmission resources in multicast services can be reduced as much as possible.
  • the embodiment of the present application also provides a data sending and receiving method, specifically, the multicast channel state information may be determined based on the feedback information of the channel state of the terminal device.
  • the method can be applied between the first device and at least one terminal device.
  • the first device may be a network device or a terminal device.
  • the method may include:
  • the first device sends at least one piece of first configuration information to at least one terminal device in the first multicast group, where the first configuration information is used to indicate time-frequency resources for CSI reporting.
  • At least one terminal device receives the first configuration information from the first device.
  • the first configuration information may further include a time-frequency resource instructing the first device to send the CSI-RS.
  • the first device before sending the first configuration information to at least one terminal device, the first device sends second configuration information to at least one terminal device, where the second configuration information is used to instruct the first device to send the time-frequency resource of the CSI-RS.
  • the first device may be configured with a group-specific CSI-RS (Group Specific CSI-RS), that is, a CSI-RS dedicated to the multicast channel. Specifically, it is a reference signal used to indicate channel state information of a multicast channel between a sending-side device (which may be a network device or a terminal device) and at least one receiving-side device. Wherein, the multicast channel may be used for the sending side device to transmit multicast data to at least one receiving side device.
  • a group-specific CSI-RS Group Specific CSI-RS
  • the second configuration information in the embodiment of the present application may specifically be the configuration information corresponding to the group-specific CSI-RS, which is used to instruct the first device to send the group-specific CSI-RS to at least one terminal device group.
  • Time-frequency resource location information of the RS may include time domain configuration parameters and frequency domain configuration parameters.
  • the base station or other network equipment may configure a corresponding RNTI for each terminal device of the above-mentioned first multicast group, which is used to uniquely identify the terminal device .
  • UE1 corresponds to RNTI1
  • UE2 corresponds to RNTI2.
  • the base station or other network equipment may configure a corresponding group identifier for each terminal device of the first multicast group, so as to identify the first multicast group in the communication system.
  • UE1 corresponds to Group1
  • UE2 also corresponds to Group1.
  • the group identifier may also be a group RNTI (Group RNTI).
  • the first device may send a piece of first configuration information, or second configuration information, to at least one terminal device.
  • the first configuration information may be carried in an RRC message, that is, the network device may add an indication field of the group-specific first configuration information in the RRC message.
  • the network device may send the RRC message to at least one terminal device through a downlink multicast channel, to instruct at least one terminal device in the first multicast group to send time-domain resource location information of the CSI report.
  • the first configuration information may be carried in In PC5 RRC message. That is, the sending UE can add the indication field of the first configuration information in the PC5 RRC message.
  • the sending UE may send the PC5 RRC message to at least one terminal device through a sidelink multicast channel, to indicate the first configuration information corresponding to the first multicast group.
  • the first device can send the time-domain resource location information of the CSI report corresponding to the first multicast group to at least one terminal device through a signaling, so that communication can be effectively saved signaling.
  • the specific implementation manner for the first device to send the second configuration information to at least one terminal device is similar to that of the first configuration information. For details, refer to the above related description, and details will not be repeated here.
  • the first device may respectively send corresponding first configuration information or second configuration information to each of the at least one terminal device.
  • the network device may respectively send a corresponding RRC message to each of the at least one terminal device.
  • the network device sends RRC1 to UE1, where the RRC1 includes SRS configuration information; the network device sends RRC2 to UE2, where the RRC2 includes first configuration information or second configuration information.
  • the first configuration information/second configuration information corresponding to each terminal device are the same.
  • the sending UE may respectively send at least one terminal device Each end device in the device sends a corresponding PC5 RRC message.
  • the sending UE sends PC5 RRC1 to the receiving UE1, and the PC5 RRC1 includes the first configuration information or the second configuration information.
  • the sending UE sends PC5 RRC2 to the receiving UE2, and the PC5 RRC2 includes, or the second configuration information.
  • the first configuration information/second configuration information corresponding to each terminal device at the receiving side such as UE1 and UE2, are the same.
  • the first device may send group-specific SRS configuration information corresponding to the first multicast group to N terminal devices through N signaling, where N may be greater than A positive integer of 1.
  • the first device respectively sends corresponding first configuration information to each of the at least one terminal device, and the first configuration information corresponding to each terminal device is the same.
  • the first configuration information may include an indication of a frequency domain resource candidate set for the terminal device to send the CSI report, and time domain constraint information for the terminal device to send the CSI report.
  • the frequency domain resource candidate set for sending the CSI report may be located at the intersection of the sending BWPs of at least one receiving-side terminal device in the first multicast.
  • the first configuration information may include constraint parameters of frequency domain resources, that is, the first configuration information is used to indicate that at least one terminal device can send CSI to the first device within the bandwidth of the frequency domain resources indicated by the first configuration information. Report.
  • the first configuration information may implicitly indicate the time domain constraint for the terminal device to send the CSI report.
  • the terminal device may send the CSI report to the first device within the duration Z according to the agreement. That is to say, the maximum value of time-domain resources for the terminal device to send the CSI report may be less than or equal to the threshold Z.
  • the first configuration information may include a first time limit, and the first configuration information is used to indicate that at least one terminal device may send a CSI report to the first device within the first time limit.
  • the first device can restrict different terminal devices in the multicast group to report CSI reports synchronously within the preset time constraint, so that the first device can determine the multicast
  • the channel state information is more accurate, which effectively improves the utilization rate of the multicast channel.
  • the first device sends a CSI-RS to at least one terminal device.
  • the first device may send the CSI-RS to at least one terminal device according to the time-frequency resource position indicated in the aforementioned second configuration information.
  • at least one terminal device receives the CSI-RS from the first device.
  • Each terminal device in the first multicast group sends a CSI report to the first device.
  • the terminal device receives the CSI-RS from the first device, obtains CSI by measuring the CSI-RS, and reports the CSI to the first device through a CSI report.
  • the at least one terminal device all performs measurement according to the same multicast CSI-RS, and feeds back a CSI report.
  • the first device receives at least one CSI report from at least one terminal device.
  • At least one terminal device at the receiving end in the first multicast group may synchronously report a CSI report to the first device on the same time-frequency resource according to the indication of the first configuration information in step 501 above.
  • the manner in which the terminal device reports the CSI report to the first device may be periodic, that is, at least one terminal device sends a CSI report to the first device every certain time.
  • the first configuration information may be used to indicate the period and start time point of the time-frequency resource for the CSI report. Therefore, at least one terminal device may send a CSI report to the first device at a certain period of time from the start time point according to the indication of the first configuration information.
  • the period of the time-frequency resource of the CSI report in the first configuration information is T, and the starting time point of sending the CSI report is t1. Then at least one terminal device may report a CSI report to the first device every T time interval at the same time starting at time t1.
  • the first device may configure the manner in which the terminal device reports the CSI report to be periodic, then the first device may include the time domain constraint that the terminal device periodically sends the CSI report in the first configuration information, That is, the sending cycle and the starting time point, so that the first device can limit that different terminal devices in the multicast group can report the CSI report synchronously at the preset starting time, and report the CSI report at the same period, so that the first device
  • the multicast channel state information that can be determined according to the channel state information reflected by multiple CSI reports is more immediate and accurate, and effectively improves the utilization rate of the multicast channel.
  • the manner in which the terminal device reports the CSI report to the first device may be semi-static, that is, after the first device configures at least one terminal device with the period and start time of the time-frequency resource for sending the CSI report Based on the starting time point, the terminal device may trigger reporting of the CSI report to the first device according to the real-time instruction of the first device.
  • the first device may send a Media Access Control layer (Media Access Control, MAC) control unit (Control Unit, CE) to at least one terminal device, to instruct at least one terminal device to send a CSI report to the first device.
  • Media Access Control Media Access Control
  • CE Control Unit
  • the network device may configure the terminal devices in the group, such as UE1 and UE2, with the same CSI sending period and the same sending time starting point through an RRC message.
  • the network device can also activate the terminal device in the group to semi-statically report the CSI report to the first device through a MAC CE.
  • the manner in which the terminal device reports the CSI report to the first device may also be aperiodic.
  • the first device may also send second control information to at least one terminal device, which is used to indicate that at least one terminal device may send a CSI report to the first device.
  • the second control information may specifically be DCI or SCI. That is, when the first device is a network device, the network device may send DCI to instruct at least one terminal device to report a CSI report; when the first device is a terminal device, the network device may send DCI to instruct at least one terminal device to report a CSI report .
  • the network device may use a multicast DCI to trigger at least one terminal device in the multicast group to report a CSI report to the first device on the same time-frequency resource.
  • the CSI report may include channel quality information (Channel Quality Information, CQI), rank indication (Rank Indication, RI), precoding indication (Precoding Matrix Indication, PMI) and layer indication (Layer Indication, LI ).
  • CQI Channel Quality Information
  • RI rank Indication
  • PMI Precoding Matrix Indication
  • LI Layer Indication
  • the first device determines a physical layer multicast beamforming or a precoding matrix according to at least one CSI report.
  • the CSI report reported by multiple terminal devices may be used to determine the channel state information of the multicast channel between the sending side device and multiple receiving side devices.
  • the first device may obtain the channel state information of the multicast channel according to the received CSI report reported by at least one terminal device, and then determine the physical layer multicast beamforming or precoding according to the obtained channel state information of the multicast channel matrix.
  • the specific algorithms involved can be implemented with reference to related technologies, which is not specifically limited in this application.
  • the first device sends multicast data to at least one terminal device according to physical layer multicast beamforming or a precoding matrix.
  • the CSI-RS sent by the first device to at least one terminal device may be carried on the first frequency domain resource, and the multicast data may be carried on the second frequency domain resource, where the second The frequency domain resource is the same as the first frequency domain resource, or the second frequency domain resource is a subset of the first frequency domain resource.
  • the location of the frequency domain resource for sending multicast data may be the same as that of the frequency domain resource for sending CSI-RS.
  • the frequency domain resource for sending multicast data is a subset of the frequency domain resource for sending CSI-RS.
  • the terminal device UE3 may send multicast data to UE1 and UE2 by using physical layer multicast beamforming or a precoding matrix.
  • the frequency domain resource for transmitting the multicast data may be located in the BWP of UE1 and also in the BWP of UE2.
  • the first device may perform multicast channel measurement on the multicast channel bandwidth by sending CSI-RS and receiving at least one CSI report, and sending multicast data may occupy the measured multicast channel bandwidth.
  • the bandwidth of the channel can obtain frequency domain diversity gain, thereby improving the effectiveness of multicast channel heterogeneity utilization, improving the efficiency of multicast data transmission, and thereby improving the data transmission performance of the communication system.
  • the implementation method of the present application may further include: the first device may send third control information to at least one terminal device, where the third control information may be used to indicate a time-frequency resource location for transmitting multicast data.
  • the sending of the third control information by the first device to at least one terminal device may occur before step 505 in the foregoing implementation manner, and is used to indicate to at least one terminal device the time-frequency resource for the first device to send multicast data. Therefore, after step 505, at least one terminal device can receive the multicast data from the first device according to the time-frequency resource position indicated by the at least one terminal device.
  • the first device may send the third control information to at least one terminal device according to physical layer multicast beamforming or a precoding matrix. That is, the first device sends the third control information to at least one terminal device by using the physical layer multicast beamforming or the precoding matrix determined in step 504 above.
  • the third control information may specifically be SCI or DCI, which is used to notify at least one terminal device of time-frequency resources for transmitting multicast data, so that the beam coverage of the third control information and the effectiveness of communication can be improved .
  • the first device does not need to individually multicast and send the third control information to at least one terminal device, which can effectively save signaling overhead, save communication resources, and improve the efficiency of the communication system.
  • the first device may also send third control information to at least one terminal device respectively, so as to instruct the terminal device how to receive or decode the multicast data.
  • the first device may send third control information to UE1, and in addition, the second device also sends third control information to UE2.
  • UE1 and UE2 correspond to the same third control information.
  • the third control information may specifically be DCI.
  • the first device is a terminal device, that is, the first device is a sending side device that can be used to send multicast data on the sidelink in the first multicast, at this time, the third control information may specifically be SCI .
  • the network device may send DCI to at least one terminal device according to physical layer multicast beamforming or a precoding matrix.
  • a network device sends DCI to UE1 and UE2 through a physical layer multicast beam.
  • the DCI transmitted by the multicast may be carried on the PDCCH.
  • step 505 may be performed, that is, the network device may send multicast data to at least one terminal device according to the physical layer multicast beamforming or the precoding matrix.
  • the multicast data may be carried on the physical downlink shared channel PDSCH.
  • the network device may also send DCI to at least one terminal device respectively, for instructing the terminal device how to receive or decode the multicast data.
  • the network device sends DCI to UE1 to instruct UE1 how to receive or decode PDSCH; in addition, the network device sends DCI to UE2 to instruct UE2 how to receive or decode PDSCH.
  • the DCI of the multicast transmission may include the Group ID of the first multicast group.
  • the DCI sent by the network device to at least one terminal device may also include the Group ID of the first multicast group. Referring to the foregoing group identifier indication manner may include explicit or implicit indication, which will not be repeated here.
  • the DCI of the multicast transmission may also include an MCS indication.
  • the DCI sent by the network device to at least one terminal device may further include the MCS.
  • the network device may send downlink multicast data to at least one terminal device, such as UE1 and UE2, according to the determined physical layer multicast beam property or precoding matrix.
  • the frequency domain resource for the network device to transmit the downlink multicast data may be located in the downlink BWP of UE1 and also in the downlink BWP of UE2.
  • the first device is a sending-side device that can be used to send multicast data on a sidelink in the first multicast, and is referred to as sending UE for short.
  • sending UE for short.
  • UE3 as shown in FIG. 1 may be used.
  • the sending UE may send the SCI to at least one terminal device according to physical layer multicast beamforming or a precoding matrix.
  • UE3 which is the sending UE, may send an SCI to UE1 and UE2 through a physical layer multicast beam, so as to save energy and transmit signaling.
  • the SCI of the multicast transmission may be carried on the PSCCH.
  • the sending UE may also send the SCI to at least one terminal device respectively, for instructing the terminal device how to receive or decode the multicast data.
  • the sending UE can send multicast data to at least one terminal device according to the physical layer multicast beamforming or precoding matrix, and the multicast data can be carried on the PSSCH.
  • the above SCI may also include the Group ID of the first multicast group and the MCS indication.
  • the Group ID of the first multicast group may also include the Group ID of the first multicast group and the MCS indication.
  • the first device can configure specific CSI report configuration information for the multicast channel, so that it can obtain the multicast between one sending side device and multiple receiving side devices according to the CSI reports fed back by different terminal devices
  • the channel state information of the channel so as to determine the physical layer multicast beam property or precoding matrix suitable for multicast transmission according to the channel state information of the multicast channel, which is used to send multicast data, which improves the efficiency of physical layer multicast transmission for spectrum resources
  • the utilization rate reduces the waste of transmission resources in the multicast service as much as possible. .
  • the application provides a communication device configured to implement the steps performed by the first device in the above implementation.
  • the communication device 800 may include: a sending module 801 , a receiving module 802 and a processing module 803 .
  • the sending module 801 may be configured to send channel sounding reference signal SRS configuration information to at least one terminal device in the first multicast group, and the SRS configuration information indicates the first time-frequency resource used for sending SRS, the sequence of SRS and the configuration information used for sending SRS. Antenna port for SRS.
  • the receiving module 802 may be configured to receive at least one SRS from at least one terminal device on a first time-frequency resource, and determine multicast channel state information based on the at least one SRS, wherein the time-frequency resources carrying the at least one SRS are the same, and at least The sequence of an SRS is the same.
  • the processing module 803 may be configured to determine a physical layer multicast beamforming or a precoding matrix according to the multicast channel state information.
  • the sending module 801 may also be configured to send multicast data to at least one terminal device according to physical layer multicast beamforming or a precoding matrix.
  • At least one SRS is transmitted through the same antenna port.
  • the receiving module 802 is further configured to receive at least one antenna port indication information from at least one terminal device, where the antenna port indication information is used to indicate the number of antenna ports of the corresponding terminal device, or the antenna port of the corresponding terminal device A collection of indices.
  • the processing module 803 is further configured to determine an antenna port used for sending the SRS according to at least one antenna port indication information.
  • the sending module 801 is further configured to send first control information to at least one terminal device according to the physical layer multicast beamforming or precoding matrix, where the first control information is used to indicate the time-frequency resource of the multicast data , wherein the first control information further includes the group identifier of the first multicast group.
  • the multicast data is carried on the second time-frequency resource, where the second time-frequency resource is the same as the frequency domain resource of the first time-frequency resource, or the frequency domain resource of the second time-frequency resource is the same as the frequency domain resource of the first time-frequency resource.
  • a subset of frequency domain resources of a time-frequency resource is carried on the second time-frequency resource, where the second time-frequency resource is the same as the frequency domain resource of the first time-frequency resource, or the frequency domain resource of the second time-frequency resource is the same as the frequency domain resource of the first time-frequency resource.
  • the communication apparatus 800 may be a network device, or the communication apparatus 800 may also be a terminal device in the first multicast group.
  • the sending module 801 may also be configured to send a piece of SRS configuration information to at least one terminal device, or the sending module 801 may also be configured to send the corresponding SRS configuration information to each of the at least one terminal device respectively.
  • SRS configuration information, the SRS configuration information corresponding to each terminal device is the same.
  • the present application also provides a communication device, which is used to implement the steps performed by the terminal device in the foregoing embodiments.
  • the communication device 900 may include a receiving module 901 and a sending module 902 .
  • the receiving module 901 may be configured to receive channel sounding reference signal SRS configuration information from the first device, and the SRS configuration information indicates the first time-frequency resource used for sending SRS, the sequence of SRS and the antenna port used for sending SRS.
  • the sending module 902 may be configured to send an SRS to the first device on the first time-frequency resource, where the SRS is used by the first device to determine multicast channel state information of the first multicast group according to at least one SRS.
  • the receiving module 901 may also be configured to receive multicast data from the first device, the multicast data is sent by the first device according to the physical layer multicast beamforming or precoding matrix, the physical layer multicast beamforming or precoding matrix It is determined by the first device according to the state information of the multicast channel.
  • the SRS is sent through a preset antenna port, or the SRS is sent through an antenna port indicated in the SRS configuration information.
  • the sending module 902 may also be configured to send antenna port indication information to the first device, where the antenna port indication information is used to indicate the number of antenna ports of the communication apparatus 900, or the antenna port index of the communication apparatus 900 A collection of ; the antenna port indication information is used for the first device to determine the antenna port used to send the SRS.
  • the receiving module 901 may also be configured to receive first control information from the first device, where the first control information is used to indicate the time-frequency resource of the multicast data, where the first control information further includes the first The group identifier of the multicast group, and the first control information is sent by the first device according to the physical layer multicast beamforming or precoding matrix.
  • the multicast data is carried on the second time-frequency resource, where the second time-frequency resource is the same as the frequency domain resource of the first time-frequency resource, or the frequency domain resource of the second time-frequency resource is the same as the frequency domain resource of the first time-frequency resource.
  • a subset of frequency domain resources of a time-frequency resource is carried on the second time-frequency resource, where the second time-frequency resource is the same as the frequency domain resource of the first time-frequency resource, or the frequency domain resource of the second time-frequency resource is the same as the frequency domain resource of the first time-frequency resource.
  • the first device is a network device, or the first device is a terminal device in the first multicast group.
  • the application further provides a communication device, configured to implement the steps performed by the first device in the above implementation.
  • the communication device 800 may include: a sending module 801 , a receiving module 802 and a processing module 803 .
  • the sending module 801 can be configured to send at least one first configuration information to at least one terminal device in the first multicast group, and the first configuration information is used to indicate the time-frequency resource of the channel state information CSI report; the sending module 801 can also use To send a channel state information reference signal CSI-RS to at least one terminal device.
  • the receiving module 802 may be configured to receive at least one CSI report from at least one terminal device.
  • the processing module 803 may be configured to determine a physical layer multicast beamforming or a precoding matrix according to at least one CSI report.
  • the sending module 801 may also be configured to send multicast data to at least one terminal device according to physical layer multicast beamforming or a precoding matrix.
  • the first configuration information includes a first time limit
  • the first configuration information is used to instruct at least one terminal device to send a CSI report within the first time limit.
  • the first configuration information is used to indicate a period and a starting time point of the time-frequency resource reported by the channel state information (CSI).
  • CSI channel state information
  • the sending module 801 may also be configured to send a control element MAC CE of the media access control layer to at least one terminal device, for instructing at least one terminal device to send a CSI report to the communication device.
  • the sending module 801 may also be configured to send second control information to at least one terminal device, for instructing at least one terminal device to send a CSI report to the communication apparatus.
  • the sending module 801 may also be configured to send third control information to at least one terminal device according to the physical layer multicast beamforming or precoding matrix, where the third control information is used to indicate the time-frequency of the multicast data resources, wherein the third control information further includes the group identifier of the first multicast group.
  • the CSI-RS is borne on a first frequency domain resource
  • the multicast data is borne on a second frequency domain resource, where the second frequency domain resource is the same as the first frequency domain resource, or the second frequency domain resource
  • the resources are a subset of the first frequency domain resources.
  • the communication apparatus 800 may be a network device, or the communication apparatus 800 may also be a terminal device in the first multicast group.
  • the sending module 801 may be configured to send a piece of first configuration information to at least one terminal device, or the sending module 801 may be configured to send corresponding first configuration information to each of the at least one terminal device respectively.
  • the first configuration information corresponding to each terminal device is the same.
  • the present application also provides a communication device, which is used to implement the steps performed by the terminal device in the foregoing embodiments.
  • the communication device 800 may include: a sending module 801 , a receiving module 802 and a processing module 803 .
  • the receiving module 802 can be used to receive the first configuration information from the first device, the first configuration information is used to indicate the time-frequency resource of the channel state information CSI report; the receiving module 802 can also be used to receive the channel information from the first device Status Information Reference Signal CSI-RS.
  • the processing module 803 may be configured to send a CSI report to the first device according to the CSI-RS, where the CSI report is used for the first device to determine multicast channel state information of the first multicast group according to at least one CSI report.
  • the receiving module 802 may also be configured to receive multicast data from the first device, the multicast data is sent by the first device according to the physical layer multicast beamforming or precoding matrix, and the physical layer multicast beamforming or precoding matrix It is determined by the first device according to the state information of the multicast channel.
  • the first configuration information includes a first time limit
  • the first configuration information is used to instruct the communication device to send the CSI report within the first time limit.
  • the first configuration information is used to indicate the period and the starting time point of the time-frequency resource for sending the CSI report by the communication device.
  • the receiving module 802 is further configured to receive a control unit MAC CE from the media access control layer of the first device; the sending module 801 is further configured to send a CSI report to the first device according to the MAC CE.
  • the receiving module 802 is further configured to receive second control information from the first device; the sending module 801 is further configured to send the second control information to the first device a CSI report.
  • the receiving module 802 is further configured to receive third control information from the first device, the third control information is used to indicate the time-frequency resources of the multicast data, wherein the third control information also includes the first group The group identifier of the broadcast group, and the third control information is sent by the first device according to the physical layer multicast beamforming or precoding matrix.
  • the CSI-RS is borne on a first frequency domain resource
  • the multicast data is borne on a second frequency domain resource, where the second frequency domain resource is the same as the first frequency domain resource, or the second frequency domain resource
  • the resources are a subset of the first frequency domain resources.
  • the first device is a network device, or the first device is a terminal device in the first multicast group.
  • the communication device may be presented in the form of dividing various functional modules in an integrated manner.
  • a “module” here may refer to a specific circuit, a processor and memory executing one or more software or firmware programs, an integrated logic circuit, and/or other devices that can provide the above functions.
  • the communication device can take the form shown in FIG. 2 in the foregoing.
  • the function/implementation process of the processing module 803 in FIG. 8 may be implemented by calling the computer program instructions stored in the memory 203 by the processor 201 in FIG. 2 .
  • the functions/implementation process of the sending module 801 and the receiving module 802 in FIG. 8 may be implemented through the communication interface 204 in FIG. 2 .
  • the functions/implementation process of the receiving module 901 and the sending module 902 in FIG. 9 can be realized through the communication interface 204 in FIG. 2 .
  • the processor 201 in FIG. 2 can call the computer-executed instructions stored in the memory 203, so that the apparatus 200 can perform the operations performed by the first device or the terminal device in the above-mentioned various method embodiments, and implement the present application.
  • the apparatus 200 can perform the operations performed by the first device or the terminal device in the above-mentioned various method embodiments, and implement the present application.
  • the communication group device in each of the above device embodiments may completely correspond to the first device or terminal device in the method embodiment, and the corresponding steps are performed by corresponding modules or units.
  • the The communication unit may be an interface circuit for the chip to receive signals from other chips or devices.
  • the above communication unit for sending or receiving is an interface circuit of the device, used to send signals to other devices, for example, when the device is implemented in the form of a chip, the communication unit can be used to send signals to other chips or devices Interface circuit for sending signals.
  • a computer-readable storage medium including instructions, or a computer program product is also provided, and the above-mentioned instructions can be executed by the processor 201 of the communication device 200 to implement the methods of the above-mentioned embodiments. Therefore, the technical effects that can be obtained can refer to the above-mentioned method embodiments, and will not be repeated here.
  • the present application also provides a computer program product.
  • the computer program product includes instructions. When the instructions are executed, the computer can respectively perform operations performed by the first device or the terminal device corresponding to the above method.
  • the embodiment of the present application also provides a system chip.
  • the system chip includes: a processing unit and a communication unit.
  • the processing unit may be, for example, a processor, and the communication unit may be, for example, an input/output interface, a pin, or a circuit.
  • the processing unit may execute computer instructions, so that the communication device to which the chip is applied executes the operations performed by the first device or the terminal device in the method provided by the above embodiments of the present application.
  • any communication device provided in the foregoing embodiments of the present application may include the system chip.
  • the computer instructions are stored in a storage unit.
  • An embodiment of the present application further provides a communication system, and the communication system may include: any first device in the foregoing implementation manners and at least one terminal device.
  • all or part of them may be implemented by software, hardware, firmware or any combination thereof.
  • a software program When implemented using a software program, it may be implemented in whole or in part in the form of a computer program product.
  • the computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, the processes or functions according to the embodiments of the present application will be generated in whole or in part.
  • a computer can be a general purpose computer, special purpose computer, computer network, or other programmable device.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente demande se rapporte au domaine technique des communications, et concerne un procédé et un appareil d'envoi et de réception de données, destinés à être utilisés pour résoudre le problème de gaspillage de ressources de transmission de service de multidiffusion et améliorer l'utilisation du spectre. Le procédé comprend les étapes suivantes : un premier dispositif envoie des informations de configuration de signal de référence de sondage de canal (SRS) à au moins un dispositif terminal dans un premier groupe de multidiffusion, les informations de configuration de SRS indiquant une première ressource temps-fréquence pour envoyer un SRS, une séquence du SRS, et un port d'antenne pour envoyer le SRS ; le premier dispositif reçoit au moins un SRS provenant de l'au moins un dispositif terminal sur la première ressource temps-fréquence, et détermine des informations d'état de canal de multidiffusion sur la base du ou des SRS, les ressources temps-fréquence portant au moins un SRS étant identiques, et les séquences d'au moins un SRS étant identiques ; le premier dispositif détermine une matrice de formation de faisceau de multidiffusion de couche physique ou une matrice de précodage selon les informations d'état de canal de multidiffusion ; et le premier dispositif envoie des données de multidiffusion à l'au moins un dispositif terminal selon la formation de faisceau de multidiffusion de couche physique ou la matrice de précodage.
PCT/CN2022/101686 2021-07-02 2022-06-27 Procédé et appareil d'envoi et de réception de données WO2023274182A1 (fr)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20210153164A1 (en) * 2019-11-15 2021-05-20 Qualcomm Incorporated Multicast feedback based on acknowledgment transmissions
US20210152307A1 (en) * 2019-11-15 2021-05-20 Qualcomm Incorporated Multicast feedback based on reference signal transmissions
CN112838916A (zh) * 2019-11-25 2021-05-25 大唐移动通信设备有限公司 信息传输方法及装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20210153164A1 (en) * 2019-11-15 2021-05-20 Qualcomm Incorporated Multicast feedback based on acknowledgment transmissions
US20210152307A1 (en) * 2019-11-15 2021-05-20 Qualcomm Incorporated Multicast feedback based on reference signal transmissions
CN112838916A (zh) * 2019-11-25 2021-05-25 大唐移动通信设备有限公司 信息传输方法及装置

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