WO2021218960A1 - Procédé, dispositif et système de communication en multidiffusion - Google Patents

Procédé, dispositif et système de communication en multidiffusion Download PDF

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Publication number
WO2021218960A1
WO2021218960A1 PCT/CN2021/090234 CN2021090234W WO2021218960A1 WO 2021218960 A1 WO2021218960 A1 WO 2021218960A1 CN 2021090234 W CN2021090234 W CN 2021090234W WO 2021218960 A1 WO2021218960 A1 WO 2021218960A1
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Prior art keywords
message
multicast service
terminal device
network device
multicast
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PCT/CN2021/090234
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English (en)
Chinese (zh)
Inventor
谭佳瑶
张向东
常俊仁
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华为技术有限公司
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    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/046—Wireless resource allocation based on the type of the allocated resource the resource being in the space domain, e.g. beams
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/30—Resource management for broadcast services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/40—Connection management for selective distribution or broadcast

Definitions

  • the embodiments of the present application relate to the field of communication technologies, and in particular, to a multicast communication method, device, and system.
  • the wireless communication system supports unicast and multicast downlink data transmission methods.
  • Unicast is mainly a point-to-point communication, for example, a single point communication between a sender and a receiver.
  • Multicast is a type of multicast. Multicast involves a group of terminals, and the sender sends data to the destination terminal in the group corresponding to the multicast communication.
  • Beamforming (beamforming, BF) technology is a method in which two or more parties in communication realize the necessary transmission link budget for the subsequent communication process. That is, the signal is enhanced by concentrating the transmitted signal in the direction of the beam pointing to the receiver. Communication signal quality.
  • beams need to be sent in different directions.
  • the multicast channel needs to be repeatedly sent on each beam. Since terminal equipment may not have exactly the same requirements for multicast services, it may also send multiple channels in other locations or directions without terminal equipment. Broadcast beams, which will cause a greater waste of resources.
  • the embodiments of the present application provide a multicast communication method, device, and system to improve resource utilization in the multicast communication process.
  • a multicast communication method is provided.
  • the subject of the method may be a terminal device.
  • the method specifically includes: when the terminal device is in a disconnected state, determining a first multicast service, and the first multicast service Is the multicast service that the terminal device is receiving or is interested in receiving; the terminal device sends a first message to the network device, the first message being used to indicate the first multicast service and/or available beams.
  • the network device can learn the requirements of the non-connected terminal device, and continue to send the multicast service to the terminal device or send the terminal device of interest according to the demand. Multicast business.
  • the network device may also send the first multicast service to the terminal device on the available beam, so as to improve the efficiency of multicast communication.
  • the first message may be message 1 or message 3 in the random access process, or message A in the two-step random access process.
  • the terminal device receives first indication information from the network device, where the first indication information is used to indicate that the transmission of the first multicast service is stopped. In response to the first indication information, the terminal device sends a first message to the network device. Through the first indication information, the terminal device can learn that the transmission of the first multicast service is stopped in time, and send the first message to the network device to ensure the continuity of the first multicast service.
  • the first indication information may be carried in a multicast service data packet, or the first indication information may be carried in a medium access control element (MAC CE).
  • MAC CE medium access control element
  • the terminal device determines that the first multicast service is not being transmitted.
  • the first multicast service uses single cell-point to multipoint (SC-PTM) technology, and the terminal device can detect the group radio network temporary identification (group-radio network) corresponding to the first multicast service.
  • SC-MTCH single cell-multicast transport channel
  • G-RNTI network temporary identity
  • the terminal device periodically sends the first message to the network device.
  • the network device can timely obtain relevant information about the multicast service that the terminal device is receiving or is interested in receiving, and schedule beam resources for the terminal device to transmit the first multicast service, thereby improving the performance of multicast communication .
  • the terminal device receives a second message from the network device, and the second message is used to instruct the terminal device to periodically send the first message; wherein, the second message includes the first message Two indication information, the second indication information is used to instruct the terminal device to periodically send the first message; or, the second message includes configuration information, and the configuration information is used to instruct the terminal device to send Period information of the first message.
  • the period information includes period length and/or start time.
  • the terminal device receives a third message from the network device, and the third message includes an association relationship between a beam and a multicast service.
  • the terminal device determines that the transmission of the first multicast service is stopped, and then sends the first message to the network device, so that the network device continues to send the first multicast service.
  • the information that the transmission of the first multicast service is stopped can be obtained in time, and the first message can be sent to the network device.
  • the third message may include third indication information, and the third indication information is used to instruct the terminal device to send the first message to the network device.
  • the terminal device sends the first message to the network device according to the third instruction information.
  • Sending the first message by the terminal device enables the network device to obtain information about the first multicast service that the terminal device is receiving or is interested in receiving in time, and schedule beam resources for the terminal device to transmit the first multicast service, thereby improving the performance of multicast communication .
  • the terminal device receives a fourth message from the network device, where the fourth message includes an association relationship between a beam and a multicast service; the terminal device chooses to communicate with the first group The first beam associated with the broadcast service; the terminal device measures the first beam to obtain the beam quality of the first beam.
  • the number of the first beams is one or more.
  • the beam quality of the first beam is greater than or equal to a threshold, and the available beam is the first beam; or, if the beam quality of the first beam is less than the threshold, measure the For beams other than the first beam, a second beam with a beam quality greater than or equal to the threshold is selected, and the available beam is the second beam.
  • a multicast communication method which can be implemented in the following manner: a terminal device receives a first message from a network device, and the first message includes an association relationship between a beam and a multicast service; The terminal device measures a first beam, the first beam is associated with a first multicast service, and the first multicast service is a multicast service that the terminal device is receiving or is interested in receiving; if the first beam is If the beam quality of the beam is greater than or equal to the threshold, the terminal device selects the first beam. In this way, by carrying the association relationship between the beam and the multicast service in the first message, it can help the terminal device to reselect a suitable beam, and improve the efficiency of beam failure recovery and the performance of multicast communication.
  • the first message is beam failure recovery configuration information (BeamFailureRecoveryConfig).
  • the terminal device if the beam quality of the first beam is less than the threshold, the terminal device measures the second beam, and the second beam is a beam other than the first beam; the terminal device Selecting a second beam with a beam quality greater than or equal to the threshold; the terminal device reports information for indicating the first multicast service to the network device on the time-frequency resource associated with the second beam.
  • the number of the first beams is one or more.
  • the number of the second beams is one or more.
  • the first message further includes a list of unicast candidate beams, and the list of unicast candidate beams includes beams used to carry unicast services; the terminal device may measure the first beam. Yes: if both the unicast candidate beam list and the beams associated with the first multicast service include the first beam, then measure the first beam. That is, the terminal device preferentially selects the intersection of the unicast candidate beam list and the beam associated with the first multicast service, and measures the first beam in the intersection. It can be understood that the beams in the intersection support both the unicast service and the first multicast service, so the first beam in the intersection is preferred.
  • the terminal device receives the unicast service and all the unicast services from the network device on the time-frequency resource associated with the first beam. Describe the first multicast service.
  • the terminal device measures other beams in the unicast candidate beam list, and selects a third beam with a beam quality greater than the threshold And report the information of the first multicast service on the time-frequency resource associated with the third beam.
  • the network equipment can be scheduled to send the first multicast service on the third beam, which is a suitable beam selected by the terminal device This can improve the performance of multicast communication and the efficiency of beam failure recovery.
  • the first message further includes a list of unicast candidate beams, and the list of unicast candidate beams includes beams used to carry data of unicast services; and the terminal device responds to the unicast candidate beams.
  • the beam in the beam list is measured, and the unicast service from the network device is received on the time-frequency resource associated with the beam whose beam quality is greater than or equal to the first threshold; and the beam quality of the first beam is greater than or equal to the first threshold.
  • the threshold is two, receive the first multicast service from the network device on the time-frequency resource associated with the first beam. It is understandable that the terminal device can separately receive the unicast service and the multicast service in a time division manner.
  • the threshold used for selecting the beam in the unicast candidate beam list and the threshold used for selecting the first beam or the second beam may be the same or different.
  • the association relationship between the beam and the multicast service includes any one or a combination of the following: the multicast service associated with each beam; the beam associated with each multicast service; The beam associated with the multicast service that the terminal device is receiving or is interested in receiving.
  • a multicast communication method is provided.
  • the execution subject of the method may be a terminal device.
  • the method is implemented by the following steps: the terminal device receives a first message from a network device, and the first message includes a multicast candidate beam
  • the list of multicast candidate beams includes beams for carrying multicast services; the terminal device measures the beams in the list of multicast candidate beams; the terminal device selects the first beam, and the first beam
  • a beam-associated time-frequency resource is reported to the network device for indicating the first multicast service information, the beam quality of the first beam is greater than or equal to a threshold, and the first multicast service is the terminal device being Receiving or interested in receiving multicast services.
  • Sending the list of multicast candidate beams to the terminal device through the network device can help the terminal device to select a suitable beam, and report the information of the first multicast service through the terminal device, so that the first multicast service can be received after the beam failure is restored, The continuity of the first multicast service is guaranteed or the multicast service that the terminal device is interested in can be received, and the performance of the multicast communication is improved.
  • the terminal device receives the first multicast service on the time-frequency resource associated with the first beam.
  • a multicast communication method is provided.
  • the execution subject of the method may be a network device.
  • the method is implemented by the following steps: the network device determines to stop transmitting the first multicast service; and the network device receives the first multicast service from the terminal device.
  • a message the first message is used to indicate the first multicast service and/or available beam; the network device sends the first multicast service to the terminal device on the available beam.
  • reporting the first multicast service to the network device through the terminal device can enable the network device to learn the requirements of the non-connected terminal device, and continue to send multicast services to the terminal device or to the terminal device according to the demand Send interested multicast services.
  • the network device may also send the first multicast service to the terminal device on the available beam, so as to improve the efficiency of multicast communication.
  • the first message may be message 1 or message 3 in the random access process, or message A in the two-step random access process.
  • the network device sends first indication information to the terminal device, where the first indication information is used to indicate that the transmission of the first multicast service is stopped.
  • the terminal device can promptly learn that the transmission of the first multicast service is stopped, and send the first message to the network device, so as to ensure the continuity of the first multicast service.
  • the network device sends a second message to the terminal device, and the second message is used to instruct the terminal device to periodically send the first message; wherein, the second message Contains second indication information, the second indication information is used to instruct the terminal device to periodically send the first message; or, the second message includes configuration information, and the configuration information is used to instruct the terminal
  • the device sends periodic information of the first message.
  • the period information includes period length and/or start time.
  • the method of periodically sending the first message can enable the network equipment to obtain timely information about the first multicast service that the terminal device is receiving or is interested in receiving, and schedule beam resources for the terminal device to transmit the first multicast service, thereby improving the performance of multicast communication. performance.
  • the network device sends a third message to the terminal device; the third message includes the association relationship between the beam and the multicast service, and the terminal device determines the first group according to the third message
  • the first message is sent to the network device, so that the network device continues to send the first multicast service.
  • the third message includes third indication information, and the third indication information is used to instruct the terminal device to send the first message to the network device.
  • the terminal device may send the first message to the network device according to the third instruction information.
  • Sending the first message by the terminal device enables the network device to obtain information about the first multicast service that the terminal device is receiving or is interested in receiving in time, and schedule beam resources for the terminal device to transmit the first multicast service, thereby improving the performance of multicast communication .
  • a method for multicast communication is provided.
  • the execution subject of the method may be a network device.
  • the method is implemented by the following steps: the network device sends a first message to the terminal device, and the first message includes The relationship between beams and multicast services.
  • the network device receives a second message from the terminal device, the second message is used to indicate a first beam; the network device sends to the terminal device on the time-frequency resource associated with the first beam A first multicast service, where the first multicast service is associated with the first beam.
  • the network device receives a third message from the terminal device, where the third message is used to request beam failure recovery.
  • the first message is beam failure recovery configuration information (BeamFailureRecoveryConfig).
  • the network device receives a fourth message from the terminal device, where the fourth message is used to indicate the second beam and the first multicast service; the network device is in the first Sending the first multicast service to the terminal device on the time-frequency resource associated with the beam.
  • the association relationship between the beam and the multicast service includes any one or a combination of the following: the multicast service associated with each beam; the beam associated with each multicast service; The beam associated with the multicast service that the terminal device is receiving or is interested in receiving; the beam that supports the transmission of the multicast service.
  • a multicast communication method is provided.
  • the execution subject of the method may be a network device.
  • the method is implemented by the following steps: the network device receives a first message from a terminal device, the first message is used to request beam failure Recovery; The network device sends a second message to the terminal device, where the second message includes a list of multicast candidate beams, and the list of multicast candidate beams includes beams used to carry multicast services.
  • Sending the list of multicast candidate beams to the terminal device through the network device can help the terminal device to select a suitable beam, and report the information of the first multicast service through the terminal device, so that the first multicast service can be received after the beam failure is restored, The continuity of the first multicast service is guaranteed or the multicast service that the terminal device is interested in can be received, and the performance of the multicast communication is improved.
  • the terminal device receives the first multicast service on the time-frequency resource associated with the first beam.
  • a communication device may be a terminal device, or a device located in a terminal device (for example, a chip, or a chip system, or a circuit), or a device that can be matched and used with the terminal device .
  • the communication device may include modules that perform one-to-one correspondence of the methods/operations/steps/actions described in the first aspect.
  • the modules may be hardware circuits, software, or hardware circuits combined with software.
  • the device may include a processing module and a communication module. The processing module is used to call the communication module to perform the function of receiving and/or sending.
  • the processing module is used to call the communication module to perform the function of receiving and/or sending.
  • the processing module is used to determine the first multicast service when it is in a disconnected state, and the first multicast service is a multicast service that is being received or is of interest to receive; the communication module is used to send the first multicast service to the network device
  • a message the first message is used to indicate the first multicast service and/or available beams.
  • the network device can learn the requirements of the non-connected terminal device, and continue to send the multicast service to the terminal device or send the terminal device of interest according to the demand. Multicast business.
  • the network device may also send the first multicast service to the terminal device on the available beam, so as to improve the efficiency of multicast communication.
  • the first message may be message 1 or message 3 in the random access process, or message A in the two-step random access process.
  • the communication module is configured to receive first indication information from the network device, and the first indication information is used to indicate that the transmission of the first multicast service is stopped. In response to the first indication information, the communication module sends a first message to the network device. Through the first indication information, the terminal device can learn that the transmission of the first multicast service is stopped in time, and send the first message to the network device to ensure the continuity of the first multicast service.
  • the first indication information may be carried in a multicast service data packet, or the first indication information may be carried in a MAC CE.
  • the processing module is used to determine that the first multicast service is not being transmitted.
  • the first multicast service adopts the SC-PTM technology
  • the terminal device can stop the transmission of the single cell-multicast transport channel (SC-MTCH) of the G-RNTI corresponding to the first multicast service.
  • SC-MTCH single cell-multicast transport channel
  • the terminal device sends the first message to the network device.
  • the communication module is configured to periodically send the first message to the network device.
  • the network device can obtain timely information about the first multicast service that the terminal device is receiving or is interested in receiving, and schedule beam resources for the terminal device to transmit the first multicast service, thereby improving the performance of multicast communication. performance.
  • the communication module is configured to receive a second message from the network device, and the second message is used to instruct to periodically send the first message; wherein, the second message includes a second indication Information, the second indication information is used to indicate that the first message is sent periodically; or, the second message includes configuration information, and the configuration information is used to instruct the terminal device to send the first message Period information.
  • the period information includes period length and/or start time.
  • the communication module is configured to receive a third message from the network device, and the third message includes an association relationship between a beam and a multicast service.
  • the processing module is configured to determine that the transmission of the first multicast service is stopped according to the third message, and then send the first message to the network device, so that the network device continues to send the first multicast service.
  • the third message may include third indication information, and the third indication information is used to instruct the terminal device to send the first message to the network device.
  • the terminal device sends the first message to the network device according to the third instruction information.
  • Sending the first message by the terminal device enables the network device to obtain information about the first multicast service that the terminal device is receiving or is interested in receiving in time, and schedule beam resources for the terminal device to transmit the first multicast service, thereby improving the performance of multicast communication .
  • the communication module is configured to receive a fourth message from the network device, where the fourth message includes an association relationship between the beam and the multicast service; the processing module is configured to select and The first beam associated with the first multicast service; the processing module is configured to measure the first beam to obtain the beam quality of the first beam.
  • the number of the first beams is one or more.
  • the beam quality of the first beam is greater than or equal to a threshold, and the available beam is the first beam; or, if the beam quality of the first beam is less than the threshold, measure the For beams other than the first beam, a second beam with a beam quality greater than or equal to the threshold is selected, and the available beam is the second beam.
  • a communication device may be a terminal device, a device located in a terminal device (for example, a chip, or a chip system, or a circuit), or a device that can be used in conjunction with the terminal device .
  • the communication device may include modules that perform one-to-one correspondence of the methods/operations/steps/actions described in the second aspect.
  • the modules may be hardware circuits, software, or hardware circuits combined with software.
  • the device may include a processing module and a communication module.
  • the processing module is used to call the communication module to perform the function of receiving and/or sending. Illustratively:
  • the communication module is configured to receive a first message from a network device, and the first message includes an association relationship between a beam and a multicast service; the processing module is configured to measure the first beam, and the first message A beam is associated with a first multicast service, and the first multicast service is a multicast service being received or interested in receiving; if the beam quality of the first beam is greater than or equal to a threshold, the processing module selects The first beam. In this way, by carrying the association relationship between the beam and the multicast service in the first message, it can help the terminal device to reselect a suitable beam, and improve the efficiency of beam failure recovery and the performance of multicast communication.
  • the first message is beam failure recovery configuration information (BeamFailureRecoveryConfig).
  • the processing module is used to measure the second beam, and the second beam is a beam other than the first beam; and For selecting a second beam with a beam quality greater than or equal to the threshold; the communication module is configured to report to the network device on the time-frequency resource associated with the second beam for indicating the first multicast service Information.
  • the number of the first beams is one or more.
  • the number of the second beams is one or more.
  • the first message further includes a unicast candidate beam list, and the unicast candidate beam list includes beams used to carry unicast services;
  • the processing module is specifically configured to: If both the broadcast candidate beam list and the beams associated with the first multicast service include the first beam, then the first beam is measured. That is, the terminal device preferentially selects the intersection of the unicast candidate beam list and the beam associated with the first multicast service, and measures the first beam in the intersection. It can be understood that the beams in the intersection support both the unicast service and the first multicast service, so the first beam in the intersection is preferred.
  • the communication module is configured to receive a unicast service from the network device on the time-frequency resource associated with the first beam And the first multicast service.
  • the processing module is configured to measure other beams in the unicast candidate beam list, and select the first beam with a beam quality greater than the threshold. Three beams, reporting the information of the first multicast service on the time-frequency resource associated with the third beam.
  • the network equipment can be scheduled to send the first multicast service on the third beam, which is a suitable beam selected by the terminal device This can improve the performance of multicast communication and the efficiency of beam failure recovery.
  • the first message further includes a unicast candidate beam list, and the unicast candidate beam list includes beams used to carry data of a unicast service; and the processing module is configured to Broadcast the beams in the candidate beam list for measurement, and receive the unicast service from the network device through the communication module on the time-frequency resources associated with the beams whose beam quality is greater than or equal to the first threshold; in the first beam
  • the communication module receives the first multicast service from the network device on the time-frequency resource associated with the first beam.
  • the terminal device can separately receive the unicast service and the multicast service in a time division manner.
  • the threshold used for selecting the beam in the unicast candidate beam list and the threshold used for selecting the first beam or the second beam may be the same or different.
  • the association relationship between the beam and the multicast service includes any one or a combination of the following: the multicast service associated with each beam; the beam associated with each multicast service; The beam associated with the multicast service that the terminal device is receiving or is interested in receiving.
  • a communication device may be a terminal device, or a device located in the terminal device (for example, a chip, or a chip system, or a circuit), or a device that can be matched and used with the terminal device .
  • the communication device may include a module that performs one-to-one correspondence of the method/operation/step/action described in the third aspect.
  • the module may be a hardware circuit, software, or a combination of hardware circuit and software.
  • the device may include a processing module and a communication module. The processing module is used to call the communication module to perform the function of receiving and/or sending.
  • the communication module is configured to receive a first message from a network device, the first message includes a list of multicast candidate beams, and the list of multicast candidate beams includes beams used to carry multicast services;
  • the processing module is used to measure the beams in the multicast candidate beam list, and used to select a first beam, and report to the network device on the time-frequency resource associated with the first beam through the communication module Information used to indicate a first multicast service, the beam quality of the first beam is greater than or equal to a threshold, and the first multicast service is a multicast service that the terminal device is receiving or is interested in receiving.
  • Sending the list of multicast candidate beams to the terminal device through the network device can help the terminal device to select a suitable beam, and report the information of the first multicast service through the terminal device, so that the first multicast service can be received after the beam failure is restored, The continuity of the first multicast service is guaranteed or the multicast service that the terminal device is interested in can be received, and the performance of the multicast communication is improved.
  • the terminal device receives the first multicast service on the time-frequency resource associated with the first beam.
  • a communication device may be a network device, a device located in a network device (for example, a chip, or a chip system, or a circuit), or a device that can be used in conjunction with the network device .
  • the communication device may include modules that perform one-to-one correspondence of the methods/operations/steps/actions described in the fourth aspect.
  • the modules may be hardware circuits, software, or hardware circuits combined with software.
  • the device may include a processing module and a communication module. The processing module is used to call the communication module to perform the function of receiving and/or sending.
  • the processing module is used to call the communication module to perform the function of receiving and/or sending.
  • a processing module configured to determine to stop transmitting the first multicast service; a communication module, configured to receive a first message from a terminal device, where the first message is used to indicate the first multicast service and/or available beams; The communication module is further configured to send the first multicast service to the terminal device on the available beam.
  • reporting the first multicast service to the network device through the terminal device can enable the network device to learn the requirements of the non-connected terminal device, and continue to send multicast services to the terminal device or to the terminal device according to the demand Send interested multicast services.
  • the network device may also send the first multicast service to the terminal device on the available beam, so as to improve the efficiency of multicast communication.
  • the first message may be message 1 or message 3 in the random access process, or message A in the two-step random access process.
  • the communication module is further configured to send first indication information to the terminal device, where the first indication information is used to indicate that the transmission of the first multicast service is stopped.
  • the terminal device can promptly learn that the transmission of the first multicast service is stopped, and send the first message to the network device, so as to ensure the continuity of the first multicast service.
  • the communication module is further configured to send a second message to the terminal device, and the second message is used to instruct the terminal device to periodically send the first message; wherein, the The second message includes second indication information, and the second indication information is used to instruct the terminal device to periodically send the first message; or, the second message includes configuration information, and the configuration information is used to indicate The terminal device transmits periodic information of the first message.
  • the period information includes period length and/or start time.
  • the method of periodically sending the first message can enable the network equipment to obtain timely information about the first multicast service that the terminal device is receiving or is interested in receiving, and schedule beam resources for the terminal device to transmit the first multicast service, thereby improving the performance of multicast communication. performance.
  • the communication module is further configured to send a third message to the terminal device; the third message includes the association relationship between the beam and the multicast service, and the terminal device determines according to the third message
  • the third message includes third indication information, and the third indication information is used to instruct the terminal device to send the first message to the network device.
  • the terminal device may send the first message to the network device according to the third instruction information.
  • Sending the first message by the terminal device enables the network device to obtain information about the first multicast service that the terminal device is receiving or is interested in receiving in time, and schedule beam resources for the terminal device to transmit the first multicast service, thereby improving the performance of multicast communication .
  • a communication device may be a network device, or a device located in a network device (for example, a chip, or a chip system, or a circuit), or can be used in conjunction with the network device Device.
  • the communication device may include a module that performs one-to-one correspondence of the method/operation/step/action described in the fifth aspect.
  • the module may be a hardware circuit, software, or a combination of hardware circuit and software.
  • the device may include a processing module and a communication module. The processing module is used to call the communication module to perform the function of receiving and/or sending.
  • the processing module is used to call the communication module to perform the function of receiving and/or sending.
  • the communication module is configured to receive a first message from the terminal device, the first message is used to request beam failure recovery; the communication module is configured to send a second message to the terminal device, the second message includes The relationship between beams and multicast services. In this way, by carrying the association relationship between the beam and the multicast service in the first message, it can help the terminal device to reselect a suitable beam, and improve the efficiency of beam failure recovery and the performance of multicast communication.
  • the first message is beam failure recovery configuration information (BeamFailureRecoveryConfig).
  • the communication module is further configured to receive a third message from the terminal device, and the third message is used to indicate the first beam; the communication module is further configured to On a time-frequency resource associated with a beam, a first multicast service is sent to the terminal device, and the first multicast service is associated with the first beam.
  • the communication module is further configured to receive a fourth message from the terminal device, where the fourth message is used to indicate the second beam and the first multicast service; the network device is Sending the first multicast service to the terminal device on the time-frequency resource associated with the first beam.
  • the association relationship between the beam and the multicast service includes any one or a combination of the following: the multicast service associated with each beam; the beam associated with each multicast service; The beam associated with the multicast service that the terminal device is receiving or is interested in receiving; the beam that supports the transmission of the multicast service.
  • a communication device may be a network device, or a device located in the network device (for example, a chip, or a chip system, or a circuit), or can be used in conjunction with the network device Device.
  • the communication device may include modules that perform one-to-one correspondence of the methods/operations/steps/actions described in the sixth aspect.
  • the modules may be hardware circuits, software, or hardware circuits combined with software.
  • the device may include a processing module and a communication module. The processing module is used to call the communication module to perform the function of receiving and/or sending.
  • the communication module is configured to receive a first message from the terminal device, the first message is used to request beam failure recovery; the communication module is configured to send a second message to the terminal device, the first message is The second message includes a list of multicast candidate beams, and the list of multicast candidate beams includes beams used to carry multicast services.
  • Sending the list of multicast candidate beams to the terminal device through the network device can help the terminal device to select a suitable beam, and report the information of the first multicast service through the terminal device, so that the first multicast service can be received after the beam failure is restored, The continuity of the first multicast service is guaranteed or the multicast service that the terminal device is interested in can be received, and the performance of the multicast communication is improved.
  • the communication module is further configured to receive the first multicast service on the time-frequency resource associated with the first beam.
  • an embodiment of the present application provides a communication device.
  • the communication device includes a communication interface and a processor.
  • the communication interface is used for communication between the device and other devices, for example, data or signal transmission and reception.
  • the communication interface may be a transceiver, circuit, bus, module, or other type of communication interface, and other devices may be network devices.
  • the processor is used to call a set of programs, instructions, or data to execute the above-mentioned first, second or third aspects and any of the possible design methods described in these aspects.
  • the device may also include a memory for storing programs, instructions or data called by the processor.
  • the memory is coupled with the processor, and when the processor executes the instructions or data stored in the memory, it can implement the first aspect, the second aspect or the third aspect and any possible design of these aspects. Described method.
  • an embodiment of the present application provides a communication device.
  • the communication device includes a communication interface and a processor.
  • the communication interface is used for communication between the device and other devices, for example, data or signal transmission and reception.
  • the communication interface may be a transceiver, circuit, bus, module, or other type of communication interface, and other devices may be network devices.
  • the processor is used to call a set of programs, instructions, or data to execute the fourth, fifth, or sixth aspects above and any of the possible design methods described in these aspects.
  • the device may also include a memory for storing programs, instructions or data called by the processor.
  • the memory is coupled with the processor, and when the processor executes the instructions or data stored in the memory, the fourth aspect, the fifth aspect or the sixth aspect and any possible design of these aspects can be implemented Described method.
  • the embodiments of the present application also provide a computer-readable storage medium.
  • the computer-readable storage medium stores computer-readable instructions.
  • the computer-readable instructions run on a computer, The methods described in the first aspect, the second aspect, or the third aspect and any possible design of these aspects are executed.
  • the embodiments of the present application also provide a computer-readable storage medium.
  • the computer-readable storage medium stores computer-readable instructions.
  • the method described in the fourth aspect, the fifth aspect, or the sixth aspect and any possible design of these aspects is executed.
  • the embodiments of the present application provide a chip system, which includes a processor and may also include a memory, which is used to implement the above-mentioned first, second, or third aspects and any of these aspects.
  • the chip system can be composed of chips, or it can include chips and other discrete devices.
  • the embodiments of the present application provide a chip system, which includes a processor and may also include a memory, which is used to implement the fourth, fifth, or sixth aspects described above, and any of these aspects.
  • the chip system can be composed of chips, or it can include chips and other discrete devices.
  • an embodiment of the present application provides a communication system, the communication system includes the terminal device described in the seventh aspect and the network device described in the tenth aspect; or, the communication system includes the eighth aspect The terminal device described in the eleventh aspect and the network device described in the eleventh aspect; or, the communication system includes the terminal device described in the ninth aspect and the network device described in the twelfth aspect.
  • the twentieth aspect provides a computer program product containing instructions, which, when run on a computer, enables as described in the first, second or third aspects and any possible design of these aspects The method is executed.
  • a computer program product containing instructions is provided. When it runs on a computer, it makes it as described in the fourth, fifth or sixth aspects and any of the possible designs of these aspects The method is executed.
  • FIG. 1 is a schematic diagram of the architecture of a communication system in an embodiment of the application
  • FIG. 3 is a schematic diagram of an optional implementation manner of one of the multicast communication methods in an embodiment of the application
  • FIG. 6 is one of the schematic diagrams of the structure of the communication device in the embodiment of the application.
  • FIG. 7 is the second schematic diagram of the structure of the communication device in the embodiment of this application.
  • the embodiments of the present application provide a multicast communication method and device, so as to ensure the quality of multicast communication when the beamforming technology is used for multicast communication.
  • the method and the device are based on the same or similar technical conception. Since the method and the device have similar principles for solving the problem, the implementation of the device and the method can be referred to each other, and the repetition will not be repeated.
  • “and/or” describes the association relationship of the associated objects, indicating that there can be three types of relationships, for example, A and/or B, which can mean: A alone exists, and both A and B exist separately. There are three cases of B.
  • the character "/" generally indicates that the associated objects before and after are in an "or” relationship.
  • At least one involved in this application refers to one or more; multiple refers to two or more.
  • words such as “first”, “second”, and “third” are only used for the purpose of distinguishing description, and cannot be understood as indicating or implying relative importance. Nor can it be understood as indicating or implying order.
  • References described in this specification to “one embodiment” or “some embodiments”, etc. mean that one or more embodiments of the present application include a specific feature, structure, or characteristic described in combination with the embodiment. Therefore, the sentences “in one embodiment”, “in some embodiments”, “in some other embodiments”, “in some other embodiments”, etc.
  • the multicast communication method and device provided in the embodiments of this application can be applied to the fourth generation (4th generation, 4G) communication system, such as long term evolution (LTE), and can also be applied to the fifth generation (5th generation, 5G) communication system.
  • Communication system such as 5G new radio (NR), or applied to various communication systems in the future.
  • the technical solution provided in this application can be applied to a multicast communication scenario, and can be, but is not limited to, a multicast communication scenario using beamforming technology.
  • Multicast communication can also be referred to as multicast communication, or multicast communication can be considered as a type of multicast communication.
  • the technical solutions of the embodiments of the present application can be applied to any multicast communication scenario.
  • FIG. 1 shows the architecture of a communication system to which the multicast communication method provided in an embodiment of the present application is applicable.
  • the communication system may include a network device 110 and include one or more terminal devices 120. in:
  • the network device 110 is a node in a radio access network (RAN), and may also be called a base station, an access network device, or a node, and may also be called a RAN node (or device).
  • RAN radio access network
  • examples of some nodes 101 are: next generation nodeB (gNB), next generation evolved nodeB (Ng-eNB), transmission reception point (TRP), evolved node B (evolved Node B, eNB), radio network controller (radio network controller, RNC), node B (Node B, NB), base station controller (base station controller, BSC), base transceiver station (base transceiver station, BTS) ), home base station (for example, home evolved NodeB, or home Node B, HNB), baseband unit (BBU), or wireless fidelity (Wifi) access point (AP), or The equipment in the 5G communication system, or the network equipment in the possible future communication system.
  • gNB next generation nodeB
  • Ng-eNB next generation evolved
  • the network device 110 may also be a device that functions as a base station in device-to-device (D2D) communication.
  • D2D device-to-device
  • the number of network devices may be one or more, and they may belong to the same cell or different cells.
  • the terminal device 120 which may also be referred to as user equipment (UE), mobile station (MS), mobile terminal (MT), etc., is a device that provides voice or data connectivity to users , It can also be an IoT device.
  • the terminal device 120 includes a handheld device with a wireless connection function, a vehicle-mounted device, and the like.
  • the terminal device 120 may be: a mobile phone (mobile phone), a tablet computer, a notebook computer, a palmtop computer, a mobile internet device (MID), a wearable device (such as a smart watch, a smart bracelet, a pedometer, etc.) ), on-board equipment (for example, cars, bicycles, electric vehicles, airplanes, ships, trains, high-speed rail, etc.), virtual reality (VR) equipment, augmented reality (AR) equipment, industrial control (industrial control) Wireless terminals, smart home equipment (for example, refrigerators, TVs, air conditioners, electric meters, etc.), smart robots, workshop equipment, wireless terminals in self-driving, and wireless terminals in remote medical surgery ,
  • the terminal device 120 may also be a device that functions as a terminal in D
  • the network device 110 and the terminal device 120 may be transmitted through radio waves, or through transmission media such as visible light, laser, infrared, or optical fiber.
  • a device that implements the functions of the terminal device 120 is referred to as a terminal as an example for introduction.
  • the wireless communication system includes unicast, multicast and broadcast.
  • Multicast and broadcast can also be called multicast.
  • the embodiments of the present application are described for multicast communication, and multicast communication is mainly taken as an example.
  • unicast communication is point-to-point communication, such as point-to-point communication between a network device and a terminal device, or point-to-point communication between two terminal devices.
  • Multicast communication is different from unicast communication in that it is point-to-multipoint communication.
  • the mobile TV service is a typical multicast service.
  • Evolved Multimedia Broadcast Multicast Service (evolved Multimedia Broadcast Multicast Service, eMBMS) technology is a multicast technology in the LTE system.
  • eMBMS evolved Multimedia Broadcast Multicast Multicast Service
  • all cells in an area require the same content to be sent at the same time. If the terminal devices are only distributed in some cells, the transmission efficiency of the eMBMS technology is relatively low.
  • SC-PTM is a multicast transmission technology.
  • the difference between the SC-PTM technology and the eMBMS technology is that the cell dispatches service data to multiple terminal devices simultaneously through G-RNTI, and each G-RNTI can be associated with a multimedia broadcast service (MBS).
  • MBS multimedia broadcast service
  • the SC-PTM technology transmits multicast services on the physical downlink share channel (PDSCH). Different from the PDSCH that carries unicast data, the PDSCH that carries multicast data is called multicast PDSCH.
  • the network equipment sends downlink control information (DCI) carried on the physical downlink control channel (PDCCH) to a group of terminal devices in a cell, and the group of terminal devices According to the scheduling information included in the DCI, the multicast PDSCH is received to complete the transmission of the multicast data.
  • DCI downlink control information
  • Beamforming is a method in which two or more parties in communication realize the necessary transmission link budget for the subsequent communication process. That is, the signal is enhanced by concentrating the transmitted signal in the direction of the beam pointing to the receiver, and the signal is enhanced by concentrating the received signal in the direction of the beam pointing to the transmitter, so that the quality of the communication signal is improved.
  • the beamforming technology can be applied to multicast communication, that is, multicast data is transmitted through the multicast beam.
  • the multicast beam using beamforming technology is narrow, in order to cover terminal devices in different areas in a cell, beams need to be sent in different directions. For example, for system information, the system information needs to be sent in each beam direction of the coverage cell to ensure that terminal devices in different areas can receive the system information.
  • the network equipment also transmits in each beam direction, because different terminal devices have different requirements for multicast services, it may appear that the multicast beam is also sent in the position or direction where there is no terminal device, or not The terminal device that needs to receive the multicast service will also receive the multicast service in the beam direction for sending the multicast service, which will cause more waste of resources.
  • the network device will send the multicast service in the beam direction where the terminal device is located when the terminal device needs to receive the multicast service.
  • the network device can learn that the terminal device needs to receive the multicast service and beam information through the message interaction with the connected terminal, so that the network device is connected
  • the multicast service is sent to the terminal device on the beam reported by the terminal device.
  • the network device will stop sending the multicast service in the beam direction. This approach can reduce waste of resources.
  • this method does not consider whether the non-connected terminal device needs to receive the multicast service, resulting in the non-connected terminal device being unable to receive the multicast service normally, which affects the quality of the multicast communication.
  • the embodiments of the present application provide a method for multicast communication, in order to improve the quality of multicast communication using beamforming technology.
  • the process of one of the multicast communication methods provided by the embodiment of the present application is as follows.
  • the first multicast service is a multicast service that the terminal device is receiving or is interested in receiving.
  • the non-connected state can be an idle state or an RRC_inactive state. Or it may be other non-connected states following the evolution of the communication system.
  • the RRC_inactive state indicates that after the data packet is sent, the network device still saves information such as the RRC context and bearer context of the terminal device.
  • the terminal device sends a first message to the network device, where the first message is used to indicate the first multicast service and/or available beams.
  • the network device can learn the multicast service demand of the non-connected terminal device, and continue to send the multicast service to the terminal device or to the terminal device according to the demand Interested multicast services.
  • the network device may also send the first multicast service to the terminal device on the available beam, so as to improve the efficiency of multicast communication.
  • the first message may be used to indicate the first multicast service; or, the first message may be used to indicate the first multicast service and available beams; or, the first message may be used to indicate available beams.
  • the network device may regard the beam in which the terminal device reports the first message as an available beam. For example, the terminal device sends a first message to the network device on the time-frequency resource associated with beam 1, and the first message is used to indicate the first multicast service.
  • the network device receives the first message from the terminal device on the time-frequency resource associated with beam 1.
  • the network device determines that the beam 1 used to carry the first message is an available beam selected by the terminal device, and the network device sends the first multicast service to the terminal device on the time-frequency resource associated with the beam 1.
  • the terminal device detects or receives the first multicast service from the network device on the time-frequency resource associated with the beam 1.
  • the first multicast service and the available beam can be indicated by one message, that is, the first message is used to indicate the first group of interest to the terminal device at the same time Broadcast services and beams available to the terminal device, the network equipment can send the multicast services that are being received or of interest to the terminal device on the available beams reported by the terminal device, for example, the terminal device reports that the multicast service of interest is the first multicast For services, the reported available beam is beam 1, and the network device can choose to send the first multicast service to the terminal device on the beam 1 reported by the terminal device.
  • the network device can choose to send the first multicast service to the terminal device on the beam 2 reported by the terminal device
  • the network device selects beam 2 from beam 1 and beam 2 to deliver the multicast service according to the result of beam measurement.
  • the terminal device may also indicate the multicast service and the beam separately through two messages.
  • the first message may indicate an available beam, but does not indicate the first multicast service.
  • the network device may further determine the first multicast service that the terminal device is receiving or is interested in receiving.
  • the network device may determine the first multicast service associated with the available beam according to the available beam reported by the terminal device.
  • the terminal device and the network device can know in advance the mapping relationship between the beam and the multicast service, and the mapping relationship can be specified by the protocol or notified to the terminal device through the network device, for example, through a system message or other message notification To the terminal device.
  • which multicast services the network device sends on the available beam will continue to send these multicast services on the available beam.
  • the available beam is beam 1
  • the network device sends multicast service 1 on beam 1
  • the terminal device determines that the first multicast service that it is receiving or is interested in receiving is multicast service 1.
  • the terminal device reports to the network device that the available beam is beam 1, and the network device continues to send multicast service 1 on beam 1. In this way, it is avoided that the network equipment stops transmitting the multicast service 1 when there is no connected terminal receiving the multicast service 1 on the beam 1, and the continuity of the terminal device 1 receiving the multicast service 1 can be ensured.
  • the first message may be a message sent by the terminal device to the network device during the random access process.
  • the random access process can be implemented in different ways.
  • the random access process may include a 4-step random access process. Specifically, the terminal device sends a random access preamble (preamble, also called message 1) to the network device, and the network device returns a random access response to the terminal device.
  • the device sends a message 3 (Msg3) to the network device, and the message 3 is a physical uplink shared channel (PUSCH).
  • the random access process may also include a 2-step random access process.
  • the terminal device sends a message A (msgA) to the network device, and the network device sends a message B to the terminal device, where the message A consists of two parts.
  • the message A is composed of a preamble sent by a physical random access channel (PRACH) and a message sent by the PUSCH channel
  • the terminal device can carry uplink data in the message A.
  • the terminal device and the network equipment complete the random access process through two-step message sending and receiving. Based on this, the first message may be message 1 or message 3 in the 4-step random access process, and the first message may also be message A in the 2-step random access process.
  • the non-connected terminal device may report the first multicast service and/or the available beam to the network device through the first message, but the random access process may not necessarily be completed to achieve random access.
  • S203 The network device decides to stop the transmission of the first multicast service.
  • the network device sends the first multicast service in the first beam direction.
  • the terminal device in the connected state in the first beam direction receives the first multicast service.
  • the terminal device in the connected state does not continue to receive the first multicast service.
  • the network device is in the first multicast service. Stop transmitting the first multicast service in a beam direction.
  • the non-connected terminal device in the first beam direction when the network device transmits the first multicast service in the first beam direction, the non-connected terminal device can receive the first multicast from the network device business. If once the transmission of the first multicast service is stopped, the network device cannot perceive whether there is a non-connected terminal device that needs to continue to receive the first multicast service. Through the embodiment S202 of the present application, the network device can perceive that the terminal device in the non-connected state needs to continue to receive the first multicast service, so that the continuity of the non-connected terminal device in receiving the multicast service of interest to it is not affected.
  • the network device sends first indication information to the terminal device, where the first indication information is used to indicate that the transmission of the first multicast service is stopped.
  • the terminal device receives the first indication information from the network device.
  • the terminal device In response to the first indication information, the terminal device sends a first message to the network device.
  • the terminal device determines that the transmission of the first multicast service is stopped, and then sends the first message to the network device, so that the network device continues to send the first multicast service.
  • the first indication information may be carried in a multicast service data packet, or carried in the MAC CE.
  • the network device carries the first indication information in the sent data packet of the first multicast service.
  • the network device sends the first indication information to the terminal device indicating that the transmission of the first multicast service will be stopped, but does not stop the transmission immediately, and may send the first indication information to the terminal device.
  • a timer is started or a timer is started immediately after sending the first indication information.
  • the network device continues to send the multicast service, and stops transmitting the multicast service after the timer expires.
  • the timing duration of the timer may be the length of a round-trip transmission time (RTT).
  • the network device after the network device decides to stop transmitting the multicast service, it sends the first indication information to the terminal device, but does not stop the transmission immediately, and the network device determines the time to continue the transmission.
  • the terminal device can keep receiving the first multicast service by promptly notifying the network equipment that it is interested in the multicast service and hopes to continue to receive the multicast service, so as to avoid the inconvenience caused by the stop of the transmission of the first multicast service, and ensure The continuity of the first multicast service improves the quality of multicast communication.
  • S205 is also included before S202 or S201.
  • S205 The terminal device determines that the first multicast service is not being transmitted.
  • the terminal device determines that the first multicast service is not being transmitted by means of self-detection.
  • the terminal device determining that the first multicast service is not being transmitted may include the following situations.
  • the network device is not transmitting the first multicast service, and the terminal device does not detect the first multicast service.
  • the network device is transmitting the first multicast service, but the terminal device cannot detect or receive the first multicast service.
  • the network device sends the first group in other beam directions that do not match the receiving beam of the terminal device. Broadcast service, the terminal device cannot detect or receive the first multicast service.
  • the first multicast service adopts the SC-PTM technology
  • the terminal device can stop the transmission of the single cell-multicast transport channel (SC-MTCH) of the G-RNTI corresponding to the first multicast service.
  • SC-MTCH single cell-multicast transport channel
  • the terminal device sends the first message to the network device.
  • the terminal device periodically sends the first message to the network device.
  • S206 is further included before S202 or S201.
  • S206 The network device sends a second message to the terminal device, and the terminal device receives the second message from the network device.
  • the second message is used to instruct the terminal device to periodically send the first message.
  • the second message includes second indication information, and the second indication information instructs the terminal device to periodically send the first message.
  • the second message may also include configuration information, and the configuration information is used to instruct the terminal device to send periodic information of the first message.
  • the period information may include the length of the period or the start time.
  • S207 is further included before S202 or S201.
  • S207 The network device sends a third message to the terminal device, and the terminal device receives the third message from the network device.
  • the terminal device In response to the third message, the terminal device sends the first message to the network device.
  • the terminal device determines that the transmission of the first multicast service is stopped, and then sends the first message to the network device, so that the network device continues to send the first multicast service.
  • the third message may include the association relationship between the beam and the multicast service, and when the terminal device includes the association relationship between the beam and the multicast service in the received third message from the network device, it determines that the first multicast The transmission of the business is stopped.
  • the third message may be a system message or other messages, and the system message is described as an example.
  • the terminal device Before receiving the system message including the association relationship between the beam and the multicast service, the terminal device periodically receives the system message that does not carry the association relationship between the beam and the multicast service, and once it receives the system message including the beam and the multicast service The terminal device sends the first message to the network device. That is, the network device sends the association relationship between the beam and the multicast service to the terminal device through the system message, implicitly instructing the terminal device to send the first information to the network device to report information such as the multicast service of interest and the available beam.
  • the third message includes third indication information, and the third indication information is used to instruct the terminal device to send the first message to the network device.
  • the third indication information can be a system message or other messages, and the system message is described as an example.
  • the terminal device Before receiving the system message including the third indication information, the terminal device periodically receives the system message that does not carry the third indication information. Once receiving the system message including the third indication information, the terminal device sends the first system message to the network device. information.
  • the first message indicates available beams
  • some optional implementations for determining available beams are given below.
  • the available beam can also be considered as the beam selected by the terminal device.
  • S208 is further included before S202 or S201.
  • the network device sends a fourth message to the terminal device, and the terminal device receives the fourth message from the network device.
  • the fourth message may include the association relationship between the beam and the multicast service.
  • the terminal device selects the first beam associated with the first multicast service according to the association relationship between the beam and the multicast service.
  • the terminal device measures the first beam to obtain the beam quality of the first beam.
  • the terminal device may measure other beams other than the first beam , Select a second beam whose beam quality is greater than or equal to the threshold, and the available beam in S202 is the second beam. That is, when the beam quality of the first beam is greater than or equal to the threshold, the terminal device preferentially reports the first beam corresponding to the first multicast service of interest to the network device. When the beam quality of the first beam is less than the threshold, Measure other beams and select other beams with suitable beam quality to report to the network equipment.
  • the available beam reported by the terminal device may be one or multiple.
  • the network device may send the first multicast service on multiple beams, or the network device may send the first multicast service on one beam or part of the multiple beams business.
  • the fourth message here may be a system message or other messages.
  • the network device may always carry the association relationship between the beam and the multicast service in the system message, and when the terminal device determines that it needs to send the first message to the network device, the system message carries the beam and The association relationship between the multicast services determines the available beams.
  • the fourth message may be similar to the third message in the foregoing implementation manner 4. That is, the terminal device periodically before receiving the system message including the association relationship between the beam and the multicast service To receive system messages that do not carry the association relationship between the beam and the multicast service. Once the system message including the association relationship between the beam and the multicast service is received, the terminal device can carry the beam and the multicast service according to the system message. The correlation between determines the available beams.
  • the association relationship between the beam and the multicast service may include any one or a combination of the following information:
  • the multicast service associated with each beam that is, with the beam as the granularity, configure the multicast service supported or associated with each beam (per beam).
  • each multicast service that is, with the multicast service as the granularity, each (per) multicast service supported or associated beam is configured.
  • the terminal device in the disconnected state may determine the first beam associated with the first multicast service according to the association relationship between the beam and the multicast service.
  • the network device may send the first multicast service on the first beam.
  • the available beam reported by the terminal device in S202 is the second beam, and the network device may schedule to send the first multicast service on the second beam.
  • the process of the second method of multicast communication is as follows.
  • the network device sends a message to the terminal device to distinguish it from the above message, which is recorded as the fifth message here.
  • the terminal device receives the fifth message from the network device.
  • the fifth message may include the association relationship between the beam and the multicast service.
  • the terminal device may determine the first beam associated with the first multicast service according to the fifth message, where the first multicast service is a multicast service that the terminal device is receiving or is interested in receiving.
  • S400 is further included.
  • the terminal device sends a message requesting beam failure recovery to the network device, and the network device receives the message requesting beam failure recovery from the terminal device.
  • the terminal device measures the first beam.
  • the first beam is associated with the first multicast service.
  • the first beam may be one or more beams.
  • the terminal device may report the information of the first beam to the network device.
  • the network device learns that the terminal device selects the first beam and sends data to the terminal device on the first beam.
  • the data may include the first multicast service.
  • S404 to S406 may be included.
  • the terminal device selects a second beam whose beam quality is greater than or equal to a threshold.
  • the terminal device reports information for indicating the first multicast service to the network device on the time-frequency resource associated with the selected second beam.
  • the network device can obtain the beam available to the terminal device As well as the information of the first multicast service, the network equipment will schedule the second beam to transmit the first multicast service, so that the terminal device can receive the first multicast service on a suitable beam, thereby improving the performance of multicast communication and the efficiency of beam failure recovery .
  • the association relationship between beams and multicast services may include any one or a combination of the following information:
  • the multicast service associated with each beam that is, with the beam as the granularity, configure the multicast service supported or associated with each beam (per beam). For example, you can configure the multicast service list corresponding to each beam.
  • each multicast service that is, with the multicast service as the granularity, each (per) multicast service supported or associated beam is configured.
  • a beam list or candidate beam list corresponding to each multicast service can be configured.
  • the beam list or the candidate beam list may include reference signals of candidate beams and associated random access (random access, RA) parameters.
  • the reference signal may be a channel state information reference signal (channel state information reference signal, CSI-RS), and the reference signal may also be a synchronization signal block (SS/PBCH block, SSB).
  • the beam associated with the multicast service that the terminal device is receiving or is interested in receiving Before the beam fails, the terminal device in the connected state will report to the network device the beam associated with the multicast service that it is receiving or is interested in receiving.
  • the network device may carry the multicast that the terminal device is receiving or interested in receiving in the fifth message. Beam information associated with the service.
  • the fifth message may be beam failure recovery configuration information (BeamFailureRecoveryConfig).
  • the terminal device may have both a multicast service and a unicast service.
  • the fifth message may also include a unicast candidate beam list, and the unicast candidate beam list includes beams used to carry the unicast service.
  • the unicast candidate beam list may include the reference signal of the candidate beam and the associated RA parameters.
  • the reference signal can be CSI-RS, and the reference signal can also be SSB.
  • the terminal device may have the following optional implementation manners.
  • the first beam measured by the terminal device in S402 is the beam in the unicast candidate beam list. That is, the terminal device preferentially selects the intersection of the unicast candidate beam list and the beam associated with the first multicast service, and measures the first beam in the intersection. It can be understood that the beams in the intersection support both the unicast service and the first multicast service, so the first beam in the intersection is preferred.
  • the terminal device can report the information of the first beam to the network device.
  • the network device learns that the terminal device selects the first beam and sends data to the terminal device on the first beam.
  • the data may include The first multicast service.
  • the terminal device receives the unicast service and the first multicast service from the network device on the time-frequency resource associated with the first beam.
  • the terminal device measures other beams in the unicast candidate beam list, selects the third beam whose beam quality is greater than the threshold, and reports the first group on the time-frequency resource associated with the third beam Broadcast business information.
  • the fifth message includes the unicast candidate beam list, it can be combined with the foregoing embodiments of S404 to S406, and the second beam in the foregoing S404 to S406 is in the unicast candidate beam list described here.
  • the beam of, the third beam selected here is the second beam selected in S404 to S406.
  • the foregoing embodiments of S404 to S406 may be applicable to the case where the unicast candidate beam list is not included in the fifth message.
  • the terminal device selects and reports the unicast beam and the multicast beam respectively, and receives the unicast service and the multicast service respectively.
  • the terminal device measures the beams in the unicast candidate beam list, and the terminal device can report to the network equipment the information of the beams whose beam quality is greater than or equal to the threshold.
  • the terminal device sends unicast services to the terminal device, and the terminal device receives the unicast services from the network equipment on the time-frequency resources associated with the beams whose beam quality is greater than or equal to the threshold;
  • the terminal device When the beam quality of the first beam is greater than or equal to the threshold, the terminal device receives the first multicast service from the network device on the time-frequency resource associated with the first beam, and selects the beam when the beam quality of the first beam is less than the threshold For the second beam with a quality greater than or equal to the threshold, the terminal device reports information for indicating the first multicast service to the network device on the time-frequency resource associated with the selected second beam.
  • the network device sends the first multicast service to the terminal device on the time-frequency resource associated with the second beam, and the terminal device receives the first multicast service from the network device on the time-frequency resource associated with the selected second beam.
  • the terminal device can separately receive the unicast service and the multicast service in a time division manner.
  • the threshold used for selecting the beam in the unicast candidate beam list and the threshold used for selecting the first beam or the second beam may be the same or different.
  • the beam quality may include reference signal received power (RSRP), reference signal received quality (RSRQ), and signal to interference plus noise. ratio, SINR) or other types of information, which are not limited in the embodiment of the present application.
  • RSRP reference signal received power
  • RSSQ reference signal received quality
  • SINR signal to interference plus noise. ratio
  • IE information element
  • candidateMBSListofBeam is the candidate multicast list of the beam
  • SEQUENCE represents enumeration
  • SIZE represents the list size
  • the process of the third method of multicast communication provided by the embodiment of the present application is as follows.
  • the network device sends a message to the terminal device. For distinguishing purposes, it is recorded as the sixth message here; the terminal device receives the sixth message from the network device.
  • the sixth message includes a list of multicast candidate beams, and the list of multicast candidate beams includes beams used to carry multicast services.
  • the terminal device measures the beams in the multicast candidate beam list.
  • the multicast candidate beam list may include reference signals of candidate beams and associated RA parameters.
  • the reference signal can be CSI-RS, and the reference signal can also be SSB.
  • the terminal device selects the first beam, and reports information for indicating the first multicast service to the network device on the time-frequency resource associated with the first beam.
  • the beam quality of the first beam is greater than or equal to the threshold, and the first multicast service is a multicast service that the terminal device is receiving or is interested in receiving.
  • the network device After the terminal device reports the information of the first multicast service, the network device sends the first multicast service to the terminal device.
  • the terminal device receives the first multicast service on the time-frequency resource associated with the first beam.
  • candidateBeamListofMBS SEQUENCE(SIZE(1..maxBeams)) OF PRACH-ResourceDedicatedBFR.
  • Sending the list of multicast candidate beams to the terminal device through the network device can help the terminal device to select a suitable beam, and report the information of the first multicast service through the terminal device, so that the first multicast service can be received after the beam failure is restored, The continuity of the first multicast service is guaranteed or the multicast service that the terminal device is interested in can be received, and the performance of the multicast communication is improved.
  • the methods provided in the embodiments of the present application are introduced from the perspectives of network equipment, terminal devices, and interaction between the network equipment and the terminal devices.
  • the network equipment and terminal devices may include hardware structures and/or software modules, and the above functions are realized in the form of hardware structures, software modules, or hardware structures plus software modules. . Whether a certain function among the above-mentioned functions is executed by a hardware structure, a software module, or a hardware structure plus a software module depends on the specific application and design constraint conditions of the technical solution.
  • an embodiment of the present application also provides a communication device 600.
  • the communication device 600 may be a terminal device or a network device, or a terminal device or a device in the network device, or A device that can be used with terminal devices or network equipment.
  • the communication device 600 may include modules that perform one-to-one correspondence of the methods/operations/steps/actions performed by the terminal device or network equipment in the foregoing method embodiments.
  • the modules may be hardware circuits, software, or It can be realized by hardware circuit combined with software.
  • the communication device may include a processing module 601 and a communication module 602.
  • the processing module 601 is used to call the communication module 602 to perform receiving and/or sending functions.
  • the processing module 601 is configured to determine the first multicast service when it is in a disconnected state, and the first multicast service is a multicast service that is being received or is of interest to be received;
  • the communication module 602 is configured to send a first message to the network device, where the first message is used to indicate the first multicast service and/or available beams.
  • the communication module 602 is configured to receive a first message from a network device, and the first message includes the association relationship between the beam and the multicast service;
  • the processing module 601 is configured to measure the first beam , The first beam is associated with the first multicast service, and the first multicast service is a multicast service being received or interested in receiving; if the beam quality of the first beam is greater than or equal to the threshold, the processing module selects the first beam.
  • the communication module 602 is configured to receive a first message from a network device, the first message includes a list of multicast candidate beams, and the list of multicast candidate beams includes beams for carrying multicast services; processing module 601 is used to measure the beams in the list of multicast candidate beams, and used to select the first beam.
  • the communication module 602 reports the information indicating the first multicast service to the network device on the time-frequency resource associated with the first beam. Information, the beam quality of the first beam is greater than or equal to a threshold, and the first multicast service is a multicast service that the terminal device is receiving or is interested in receiving.
  • the communication module 602 is also configured to perform other receiving or sending steps or operations performed by the terminal device in the foregoing method embodiment.
  • the processing module 601 may also be used to perform other corresponding steps or operations performed by the terminal device in the foregoing method embodiment except for receiving and sending, which will not be repeated here.
  • the processing module 601 is configured to determine to stop transmitting the first multicast service; the communication module 602 is configured to receive a first message from a terminal device, and the first message is used to indicate the first group Broadcast services and/or available beams; the communication module is further configured to send the first multicast service to the terminal device on the available beams.
  • the processing module 601 is configured to call the communication module 602 to receive a first message from a terminal device, the first message is used to request beam failure recovery; and to send a second message to the terminal device,
  • the second message includes the association relationship between the beam and the multicast service.
  • the processing module 601 is configured to call the communication module 602 to receive a first message from the terminal device, the first message is used to request beam failure recovery; and to send a second message to the terminal device,
  • the second message includes a list of multicast candidate beams, and the list of multicast candidate beams includes beams used to carry multicast services.
  • the communication module 602 is also configured to perform other receiving or sending steps or operations performed by the network device in the foregoing method embodiment.
  • the processing module 601 may also be used to perform other corresponding steps or operations performed by the network device in the foregoing method embodiment except for receiving and sending, which will not be repeated here.
  • the communication module 602 may be a sending unit or a transmitter when sending information, and may be a receiving unit or a receiver when receiving information.
  • the transceiver unit may be a transceiver, and the transceiver, transmitter or receiver may be a radio frequency circuit.
  • the communication device 600 and the communication device 700 include a storage unit, the storage unit is used to store computer instructions, and the processing module 601 is in communication connection with the storage unit.
  • the processing module 601 executes the computer instructions stored in the memory so that the communication device 600 executes the above The method executed by the terminal device or the network device in the method embodiment.
  • the processing module 601 may be a general-purpose central processing unit (central processing unit, CPU), a microprocessor, or an application specific intergrated circuit (ASIC).
  • CPU central processing unit
  • ASIC application specific intergrated circuit
  • the communication module 602 may be an input and/or output interface, a pin, a circuit, or the like.
  • the processing module 601 can execute the computer-executable instructions stored in the storage unit, so that the chip in the communication device 600 executes the method executed by the terminal device or the network device in the foregoing method embodiments.
  • the storage unit is a storage unit in the chip, such as a register, a cache, etc., and the storage unit may also be a storage unit in the terminal located outside the chip, such as a read-only memory (read-only memory). Only memory (ROM) or other types of static storage devices that can store static information and instructions, random access memory (RAM), etc.
  • the division of modules in the embodiments of this application is illustrative, and it is only a logical function division. In actual implementation, there may be other division methods.
  • the functional modules in the various embodiments of this application can be integrated into one process. In the device, it can also exist alone physically, or two or more modules can be integrated into one module.
  • the above-mentioned integrated modules can be implemented in the form of hardware or software functional modules.
  • the device can be a network device, a device in a network device, or a device that can be used in matching with the network device.
  • the device may be a terminal device, a device in a terminal device, or a device that can be matched and used with the terminal device.
  • the device may be a chip system. In the embodiments of the present application, the chip system may be composed of chips, or may include chips and other discrete devices.
  • the communication device 700 includes at least one processor 720, configured to implement the functions of the terminal device or the network device in the method provided in the embodiments of the present application.
  • the communication device 700 may further include a communication interface 710.
  • the communication interface may be a transceiver, circuit, bus, module, or other type of communication interface, which is used to communicate with other devices through a transmission medium.
  • the communication interface 710 is used for the device in the communication device 700 to communicate with other devices.
  • the other device may be a terminal device.
  • the communication device 700 is a terminal device
  • the other device may be a network device.
  • the processor 720 uses the communication interface 710 to send and receive data, and is used to implement the method described in the foregoing method embodiment. Illustratively:
  • the processor 720 is configured to determine the first multicast service when it is in a disconnected state, and the first multicast service is a multicast service that is being received or is of interest to be received;
  • the communication interface 710 is configured to send a first message to the network device, where the first message is used to indicate the first multicast service and/or available beams.
  • the communication interface 710 is configured to receive a first message from a network device, and the first message includes an association relationship between the beam and the multicast service; the processor 720 is configured to measure the first beam , The first beam is associated with the first multicast service, and the first multicast service is a multicast service being received or interested in receiving; if the beam quality of the first beam is greater than or equal to the threshold, the processing module selects the first beam.
  • the communication interface 710 is configured to receive a first message from a network device, the first message includes a list of multicast candidate beams, and the list of multicast candidate beams includes beams for carrying multicast services; the processor; 720 is used to measure the beams in the list of multicast candidate beams, and used to select the first beam, and report to the network device the information indicating the first multicast service on the time-frequency resource associated with the first beam through the communication interface 710 Information, the beam quality of the first beam is greater than or equal to a threshold, and the first multicast service is a multicast service that the terminal device is receiving or is interested in receiving.
  • the communication interface 710 is also used to perform other receiving or sending steps or operations performed by the terminal device in the foregoing method embodiment.
  • the processor 720 may also be configured to execute other corresponding steps or operations performed by the terminal device in the foregoing method embodiment except for receiving and sending, which will not be repeated here.
  • the processor 720 is configured to determine to stop transmitting the first multicast service; the communication interface 710 is configured to receive a first message from a terminal device, and the first message is used to indicate the first group Broadcast services and/or available beams; the communication module is further configured to send the first multicast service to the terminal device on the available beams.
  • the processor 720 is configured to call the communication interface 710 to receive a first message from the terminal device, where the first message is used to request beam failure recovery; and to send a second message to the terminal device,
  • the second message includes the association relationship between the beam and the multicast service.
  • the processor 720 is configured to call the communication interface 710 to receive a first message from the terminal device, the first message is used to request beam failure recovery; and to send a second message to the terminal device,
  • the second message includes a list of multicast candidate beams, and the list of multicast candidate beams includes beams used to carry multicast services.
  • the communication interface 710 is also used to perform other receiving or sending steps or operations performed by the network device in the foregoing method embodiment.
  • the processor 720 may also be configured to perform other corresponding steps or operations performed by the network device in the foregoing method embodiment except for receiving and sending, and details are not repeated here.
  • the communication device 700 may further include at least one memory 730 for storing program instructions and/or data.
  • the memory 730 and the processor 720 are coupled.
  • the coupling in the embodiments of the present application is an indirect coupling or communication connection between devices, units or modules, and may be in electrical, mechanical or other forms, and is used for information exchange between devices, units or modules.
  • the processor 720 may operate in cooperation with the memory 730.
  • the processor 720 may execute program instructions stored in the memory 730. At least one of the at least one memory may be included in the processor.
  • the embodiment of the present application does not limit the specific connection medium between the aforementioned communication interface 710, the processor 720, and the memory 730.
  • the memory 730, the processor 720, and the communication interface 710 are connected by a bus 740 in FIG. 7.
  • the bus is represented by a thick line in FIG. , Is not limited.
  • the bus can be divided into an address bus, a data bus, a control bus, and so on. For ease of representation, only one thick line is used in FIG. 7, but it does not mean that there is only one bus or one type of bus.
  • the memory 730 may be a non-volatile memory, such as a hard disk drive (HDD) or a solid-state drive (SSD), etc., and may also be a volatile memory (volatile memory). For example, random-access memory (RAM).
  • the memory is any other medium that can be used to carry or store desired program codes in the form of instructions or data structures and that can be accessed by a computer, but is not limited to this.
  • the memory in the embodiments of the present application may also be a circuit or any other device capable of realizing a storage function for storing program instructions and/or data.
  • the processor may be a general-purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, which may implement or Perform the methods, steps, and logic block diagrams disclosed in the embodiments of the present application.
  • the general-purpose processor may be a microprocessor or any conventional processor or the like. The steps of the method disclosed in combination with the embodiments of the present application may be directly embodied as being executed and completed by a hardware processor, or executed and completed by a combination of hardware and software modules in the processor.
  • an embodiment of the present application further provides a chip, including a processor, for supporting the communication device to implement the terminal device or network device involved in the foregoing method embodiment.
  • the chip is connected to a memory or the chip includes a memory, and the memory is used to store the necessary program instructions and data of the communication device.
  • the embodiment of the present application provides a computer-readable storage medium that stores a computer program, and the computer program includes instructions for executing the foregoing method embodiments.
  • the embodiments of the present application provide a computer program product containing instructions, which when run on a computer, cause the foregoing method embodiments to be executed.
  • this application can be provided as methods, systems, or computer program products. Therefore, this application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, this application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.
  • computer-usable storage media including but not limited to disk storage, CD-ROM, optical storage, etc.
  • These computer program instructions can also be stored in a computer-readable memory that can guide a computer or other programmable data processing equipment to work in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture including the instruction device.
  • the device implements the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.
  • These computer program instructions can also be loaded on a computer or other programmable data processing equipment, so that a series of operation steps are executed on the computer or other programmable equipment to produce computer-implemented processing, so as to execute on the computer or other programmable equipment.
  • the instructions provide steps for implementing the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.

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

Abstract

Sont décrits ici un procédé, un dispositif et un système de communication en multidiffusion, destinés à être utilisés pour assurer la performance de communication en multidiffusion lorsqu'une technique de formation de faisceau est employée pour une communication en multidiffusion. Le procédé comprend les étapes suivantes : lorsqu'il est dans un état déconnecté, un dispositif terminal détermine un premier service de multidiffusion, le premier service de multidiffusion étant un service de multidiffusion que le dispositif terminal reçoit actuellement ou est intéressé par la réception ; le dispositif terminal transmet un premier message à un dispositif de réseau, le premier message étant utilisé pour indiquer le premier service de multidiffusion et/ou un faisceau disponible. Le procédé peut également être mis en œuvre par les étapes suivantes : un dispositif terminal reçoit un premier message provenant d'un dispositif de réseau, le premier message comprenant des corrélations entre des faisceaux et des services de multidiffusion ; le dispositif terminal mesure un premier faisceau, le premier faisceau étant corrélé à un premier service de multidiffusion, et le premier service de multidiffusion étant un service de multidiffusion que le dispositif de terminal reçoit actuellement ou est intéressé par la réception ; et si la masse de faisceau du premier faisceau est supérieure ou égale à un seuil, alors le dispositif terminal sélectionne le premier faisceau.
PCT/CN2021/090234 2020-04-28 2021-04-27 Procédé, dispositif et système de communication en multidiffusion WO2021218960A1 (fr)

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