WO2022213799A1 - Procédé et appareil de communication pour service de multidiffusion - Google Patents

Procédé et appareil de communication pour service de multidiffusion Download PDF

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Publication number
WO2022213799A1
WO2022213799A1 PCT/CN2022/081955 CN2022081955W WO2022213799A1 WO 2022213799 A1 WO2022213799 A1 WO 2022213799A1 CN 2022081955 W CN2022081955 W CN 2022081955W WO 2022213799 A1 WO2022213799 A1 WO 2022213799A1
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information
multicast service
multicast
network element
management network
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PCT/CN2022/081955
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English (en)
Chinese (zh)
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李濛
杨艳梅
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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
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/24—Negotiating SLA [Service Level Agreement]; Negotiating QoS [Quality of Service]

Definitions

  • the embodiments of the present application relate to the field of communications technologies, and in particular, to a method and apparatus for communicating a multicast service.
  • 3GPP 3rd generation partnership project
  • 3GPP 3rd generation partnership project
  • network-side devices to send the same data to multiple terminals at the same time, that is, point-to-multipoint data transmission demand.
  • multicast communication such as establishing a multicast transmission link (referred to as a multicast session).
  • a multicast session can be shared by multiple terminals, and the network side equipment Data can be sent to a plurality of terminals through the multicast session (the data can be referred to as multicast service data).
  • the multicast service processing flow centered on the access and mobility management function (AMF) and the session management function (SMF)
  • AMF access and mobility management function
  • SMF session management function
  • Embodiments of the present application provide a method and apparatus for communicating a multicast service, so as to optimize the processing flow of the multicast service.
  • a method for communicating a multicast service may include: a first session management network element receives information of a multicast service corresponding to a first terminal from a mobility management network element, the information may include transmission mode information and/or state information, wherein the transmission mode information can be used to indicate the transmission mode of the multicast service, and the state information can be used to indicate that the multicast session corresponding to the multicast service is in a deactivated state; the first session management network element For the information of the corresponding multicast service, the first information including the quality of flow (quality of flow, QF) information for transmitting the data of the multicast service for the first terminal is sent to the mobility management network element.
  • the quality of flow quality of flow, QF
  • the first session management network element may determine the QF information for transmitting the data of the multicast service for the first terminal according to the information provided by the mobility management network element, that is, the first session management network element communicates with the mobile
  • the signaling interaction of the management network element determines the QF information corresponding to the multicast service.
  • the signaling overhead caused by the determination of the QF information can be reduced.
  • the first session management network element sends the QF information corresponding to the multicast service to the mobility management network element, so that the mobility management network element is the center to manage (for example, delete and/or release) the transmission resources corresponding to the multicast service, etc., simplifying System design, at the same time, it is convenient to control the transmission resources corresponding to the multicast service and improve the resource utilization rate.
  • the information of the multicast service corresponding to the first terminal includes transmission mode information; when the transmission mode information indicates that the transmission mode of the multicast service is the unicast transmission mode, the first information includes the unicast transmission mode corresponding to the multicast service.
  • transmission mode information indicates that the transmission mode of the multicast service is the unicast transmission mode
  • the first information includes the unicast transmission mode corresponding to the multicast service.
  • broadcast QF information or, when the transmission mode of the multicast service is a shared transmission mode, the first information includes multicast QF information corresponding to the multicast service.
  • the unicast QF information can be sent to the mobility management network element in the unicast transmission mode, and the multicast QF information can be sent to the mobility management network element in the shared transmission mode, that is, different QF information can be established according to different transmission modes. , to avoid resource waste caused by trying to establish a multicast QF in unicast transmission mode.
  • the first information when the information of the multicast service corresponding to the first terminal includes status information, the first information includes multicast QF information corresponding to the multicast service and unicast QF information corresponding to the multicast service. That is, when the multicast session is in the deactivated state, because the transmission mode when the multicast session is activated again cannot be determined, the unicast QF information and the multicast QF information are sent, so that the unicast QF information or the multicast QF information can be flexibly selected later.
  • Information transmits data for multicast services.
  • the first session management network element when the information of the multicast service corresponding to the first terminal includes state information and transmission mode information, the first session management network element sends the information to the mobility management network element according to the information of the multicast service corresponding to the first terminal.
  • Sending the first information includes: using the state information as a triggering condition to trigger sending the first information to the mobility management network element. For example, when the transmission mode information indicates that the transmission mode of the multicast service is a unicast transmission mode, the first information includes unicast QF information corresponding to the multicast service; or, when the transmission mode information indicates that the transmission mode of the multicast service is shared transmission In the mode, the first information includes multicast QF information corresponding to the multicast service.
  • the first information is carried in the N11 message. This not only ensures signaling compatibility, but also simplifies system design.
  • the method further includes: the first session management network element receives second information, the second information is used to instruct the first terminal to leave the multicast group corresponding to the multicast service, and the first session management network element The third information for deleting the unicast QF information corresponding to the multicast service is sent to the mobility management network element according to the second information.
  • the mobility management network element can be notified to delete the QF information of the multicast service related to the terminal, thereby improving resource utilization.
  • the first session management network element receiving the second information includes: the first session management network element receiving the second information from the mobility management network element.
  • the first session management network element receives the second information from the first terminal.
  • the third information is further used to modify the protocol data unit PDU session of the first terminal for transmitting the data of the multicast service.
  • the multicast session when the multicast session is in the active state, that is, the multicast session can be used to transmit the data of the multicast service, if the terminal leaves the multicast group, the modification and transmission of the multicast service with the terminal can be triggered.
  • the PDU session related to the data such as modifying/deleting the QF of the data of the terminal's PDU session for transmitting the multicast service, so as to improve the resource utilization.
  • the present application provides a method for communicating a multicast service.
  • the method includes: a mobility management network element sends information of a multicast service corresponding to a first terminal to a first session management network element, and the multicast service information corresponding to the first terminal is sent to a first session management network element.
  • the information of the multicast service includes at least one of the following: transmission mode information, or state information, the transmission mode information is used to indicate the transmission mode of the multicast service, and the state information is used to indicate that the multicast session corresponding to the multicast service is in a deactivated state;
  • the management network element receives first information from the first session management network element, where the first information includes quality of service flow QF information for transmitting data of a multicast service for the first terminal.
  • the mobility management network element may indicate to the first session management network element information related to the multicast service, such as transmission mode information and/or status information, so that the first session management network element can
  • the information provided by the network element determines the QF information used to transmit the data of the multicast service for the first terminal, that is, the QF information corresponding to the multicast service is determined through the signaling interaction between the first session management network element and the mobility management network element. Determining the QF information corresponding to the multicast service through the interaction between the first session management network element and the access network device can reduce the signaling overhead caused by determining the QF information.
  • the mobility management network element receives the QF information corresponding to the multicast service, which is convenient for subsequent Taking the mobility management network element as the center to manage (eg delete and/or release) the transmission resources corresponding to the multicast service, etc., simplify the system design, facilitate the control of the transmission resources corresponding to the multicast service, and improve the resource utilization rate.
  • the first information includes unicast QF information corresponding to the multicast service, or the first information includes multicast QF information corresponding to the multicast service.
  • the unicast QF information can be sent to the mobility management network element in the unicast transmission mode
  • the multicast QF information can be sent to the mobility management network element in the shared transmission mode, that is, different QF information can be established according to different transmission modes. , to avoid resource waste caused by trying to establish a multicast QF in unicast transmission mode.
  • the first information includes the multicast QF information corresponding to the multicast service and the unicast QF information corresponding to the multicast service, so that the unicast QF information or the multicast QF information can be flexibly selected subsequently.
  • Data for transmission of multicast services includes the multicast QF information corresponding to the multicast service and the unicast QF information corresponding to the multicast service, so that the unicast QF information or the multicast QF information can be flexibly selected subsequently.
  • the mobility management network element sends information about the multicast service corresponding to the first terminal to the first session management network element, including: if the multicast service supports a unicast transmission mode, the mobility management network element sends the information to the first session management network element.
  • the session management network element sends the information of the multicast service corresponding to the first terminal.
  • the information of the multicast service corresponding to the first terminal can be sent to the first session management network element, so as to avoid the fact that the first terminal does not support unicast transmission, As a result, the first terminal cannot receive the data of the multicast service transmitted through the unicast QF.
  • the method further includes: the mobility management network element determines whether the multicast service supports a unicast transmission mode. Ensure the accuracy of determination and improve the efficiency of determination.
  • the method further includes: the mobility management network element receives third information from the first session management network element, where the third information is used to delete the unicast QF information corresponding to the multicast service; the mobility management network element According to the third information, the unicast QF information corresponding to the multicast service is deleted.
  • the mobility management network element can delete the QF information of the multicast service related to the terminal, thereby improving the resource utilization rate.
  • the third information is also used to modify the protocol data unit PDU session of the first terminal for transmitting the data of the multicast service; the method It also includes: the mobility management network element instructs the access network device to modify the PDU session of the first terminal for transmitting the data of the multicast service.
  • the multicast session when the multicast session is in the active state, that is, the multicast session can be used to transmit the data of the multicast service, if the terminal leaves the multicast group, it is triggered to modify the connection between the access network device side and the multicast session.
  • the terminal transmits the data related to the multicast service in the PDU session, such as modifying/deleting the QF used for transmitting the multicast service data in the terminal's PDU session, so as to improve the resource utilization rate.
  • the method further includes: the mobility management network element receives a leaving request from the first terminal, and the leaving request is used to request to leave the multicast group corresponding to the multicast service; the mobility management network element, according to the leaving request, Send second information to the first session management network element, where the second information is used to instruct the first terminal to leave the multicast group corresponding to the multicast service.
  • the mobility management network element can indicate the information that the terminal leaves the multicast group to the first session management network element, and the two can not only synchronize the situation of the terminal leaving the multicast group, but also facilitate the management of the first session
  • the network element deletes the corresponding resources according to the instructions of the mobility management network element, etc., so as to improve the resource utilization rate.
  • an embodiment of the present application further provides a method for communicating a multicast service, the method comprising: a mobility management network element receiving a first message from a second session management network element for triggering activation of a transmission channel corresponding to the multicast service Fourth information, obtain the transmission mode of the multicast service according to the fourth information, and send the QF information of the multicast service to the access network device according to the transmission mode of the multicast service, and the access network device is used to process the transmission channel corresponding to the multicast service. For the transmitted data, the QF information of the multicast service is used to transmit the data of the multicast service.
  • the terminal when activating the transmission channel corresponding to the multicast service, for example, when activating the transmission resource corresponding to the multicast service, it can be determined that the data of the multicast service needs to be sent to the mobile management network element managed/registered
  • the terminal sends the corresponding QF information to the access network device corresponding to the terminal, so that the access network device establishes/activates the QF for transmitting the data of the multicast service according to the QF information corresponding to the multicast service, so as to ensure the multicast service. normal transmission of data.
  • the mobility management network element acquiring the transmission mode of the multicast service according to the fourth information includes: the mobility management network element paging the terminals in the multicast group corresponding to the multicast service according to the fourth information;
  • the management network element receives the paging response from the first terminal of the access network equipment, and the first terminal belongs to the multicast group corresponding to the multicast service;
  • the mobility management network element determines the transmission of the multicast service according to the capability information of the access network equipment Mode; the capability information of the access network device is used to characterize whether the access network device has the multicast capability.
  • the transmission mode of the multicast service is determined according to the capability information of the access network device corresponding to the terminal, so as to avoid the problem that the data of the multicast service cannot be transmitted due to the mismatch between the transmission mode and the capability of the access network device.
  • the fourth information includes the identification information of the multicast service; the mobility management network element acquiring the transmission mode of the multicast service according to the fourth information includes: the mobility management network element according to the identification information of the multicast service and the multicast service.
  • the correspondence between the service and the transmission mode of the multicast service determines the transmission mode of the multicast service.
  • the transmission mode can be determined according to the stored correspondence between the multicast service and the transmission mode, which saves signaling overhead, improves the efficiency of determining the transmission mode, and simplifies system design.
  • the fifth information when the transmission mode is the shared transmission mode, includes the multicast QF information corresponding to the multicast service and the unicast QF information corresponding to the multicast service; or, when the transmission mode is the unicast transmission mode , the fifth information includes unicast QF information corresponding to the multicast service, and the unicast QF is used to transmit data of the multicast service for a terminal in the multicast group corresponding to the multicast service.
  • an embodiment of the present application further provides a method for communicating a multicast service, the method comprising: a mobility management network element receiving a transmission channel corresponding to triggering deactivation of the multicast service from a second session management network element The sixth information; obtain the transmission mode of the multicast service according to the sixth information, and when the transmission mode of the multicast service is the shared transmission mode, the mobility management network element sends the seventh information to the access network device according to the sixth information; The access network device is used to process data transmitted on the transmission channel corresponding to the multicast service; or, when the transmission mode of the multicast service is the unicast transmission mode, the mobility management network element sends the first session management network element to the first session management network element according to the sixth information.
  • the seventh information is used to deactivate the transmission channel corresponding to the multicast service; the eighth information is used to delete the unicast QF information corresponding to the multicast service and/or deactivate the unicast QF, and the unicast QF uses A terminal in a multicast group corresponding to the multicast service transmits the data of the multicast service.
  • the seventh information is sent to the access network device corresponding to the terminal, so that the access network device can deactivate the QF used to transmit the data of the multicast service, or, if a single If the QF is broadcast, the eighth information is sent to the first session management network element, so that the first session management network element releases/deactivates the unicast QF and improves resource utilization.
  • the mobility management network element acquiring the transmission mode of the multicast service according to the sixth information includes: the mobility management network element determines the terminals in the multicast group corresponding to the multicast service according to the sixth information, and the mobility management The network element determines the access network equipment corresponding to the terminals in the multicast group corresponding to the multicast service, and the mobility management network element determines the transmission mode of the multicast service according to the capability information of the access network equipment.
  • the transmission mode of the multicast service is determined according to the capability information of the access network device, so as to avoid the problem that the data of the multicast service cannot be transmitted due to the mismatch between the transmission mode and the capability of the access network device.
  • the sixth information includes the identification information of the multicast service; the mobility management network element acquiring the transmission mode of the multicast service according to the sixth information includes: the mobility management network element according to the identification information of the multicast service and the multiple The corresponding relationship between the broadcast service and the transmission mode of the multicast service is determined, and the transmission mode of the multicast service is determined.
  • the transmission mode can be determined according to the correspondence between the multicast service and the transmission mode, which saves signaling overhead, improves the efficiency of determining the transmission mode, and simplifies the system design.
  • the seventh information is a multicast session release message or a multicast broadcast session resource release message or a multicast broadcast session stop message; the seventh information includes identification information of the multicast service.
  • the eighth information is carried in the Nsmf_protocol data unit update session management context request (Nsmf_PDUSession_UpdateSMContext request) message, and the eighth information includes identification information of the multicast service.
  • the seventh information and the eighth information are carried in the existing signaling, which saves signaling overhead and simplifies system design.
  • an embodiment of the present application further provides a method for communicating a multicast service, the method comprising: a first session management network element receiving unicast QF information corresponding to a multicast service for deleting from a mobility management network element and / or deactivate the eighth information of unicast QF; according to the eighth information, send an N2 message to the access network device; the access network device corresponds to the unicast QF, and the N2 message is used to instruct to modify the protocol data unit PDU to which the unicast QF belongs session.
  • the eighth information is sent to the first session management network element, and the first session management network element releases/deactivates the unicast QF according to the eighth information to improve resource utilization.
  • the eighth information is carried in the Nsmf_protocol data unit update session management context request (Nsmf_PDUSession_UpdateSMContext request) message, and the eighth information includes identification information of the multicast service.
  • the eighth information is carried in the existing signaling, which saves signaling overhead and simplifies system design.
  • an embodiment of the present application further provides a method for communicating a multicast service, the method comprising: a mobility management network element receiving ninth information that triggers a paging of a terminal in a multicast group corresponding to the multicast service, and according to The ninth information paging the first terminal, the first terminal belongs to the multicast group corresponding to the multicast service.
  • the mobility management network element can be triggered by the ninth information to page the terminals in the multicast group corresponding to the multicast service, thereby simplifying the signaling process of paging the terminals.
  • the ninth information carries the identification information of the multicast service
  • the mobility management network element paging the first terminal according to the ninth information includes: the mobility management network element determines the multicast service according to the identification information of the multicast service.
  • the corresponding multicast group includes the first terminal and the first terminal is in the idle state; the mobility management network element determines the first terminal according to the capability information of the access network device corresponding to the first terminal and the registration area of the first terminal In the corresponding paging area, the first terminal is paged in the paging area of the first terminal.
  • the first terminal can be determined according to the identification information of the multicast service, and the first terminal can be paged in the paging area of the first terminal, thereby simplifying the system design.
  • the paging area of the first terminal includes an area in the registration area of the first terminal except the area covered by the access network device that does not have the multicast capability. This can avoid the problem of paging the terminal in the area covered by the access network equipment that does not have the multicast capability, resulting in the terminal being successfully paged but unable to receive the data of the multicast service through the multicast session.
  • the terminal brings unnecessary power consumption.
  • the mobility management network element determines, according to the identification information of the multicast service, that the multicast group corresponding to the multicast service includes the first terminal, including: the mobility management network element according to the identification information of the multicast service, and The UE list corresponding to the multicast service includes identification information of terminals that join the multicast group corresponding to the multicast service, and it is determined that the multicast group corresponding to the multicast service includes the first terminal.
  • the method further includes: the mobility management network element receives a join request, the join request is used to request that the first terminal be added to the multicast group corresponding to the multicast service, and the mobility management network element, according to the join request, adds the join request.
  • the identification information of the first terminal is added to the UE list; or, the mobility management network element receives the UE list corresponding to the multicast service from the first session management network element.
  • the mobility management network element can maintain the UE list, or the first session management network element can locally maintain the UE list and notify the mobility management network element, thereby improving the flexibility of maintaining the UE list.
  • the mobility management network element determines, according to the identification information of the multicast service, that the multicast group corresponding to the multicast service includes the first terminal, including: the mobility management network element checks the UE context of the first terminal, When the UE context of a terminal includes the identification information of the multicast service, it is determined that the multicast group corresponding to the multicast service includes the first terminal.
  • the mobility management network element receives ninth information from the first session management network element; or, the mobility management network element receives ninth information from the second session management network element. That is, the above process of paging the UE may be triggered by the first session management network element or by the second session management network element, which is not limited, thereby improving the flexibility of triggering the paging of the UE.
  • the method further includes: the mobility management network element paging the second terminal according to the ninth information, and the second terminal belongs to the multicast group corresponding to the multicast service. That is, similarly, for other terminals in the multicast group, paging can also be done by referring to the above process, to ensure that the terminals in the multicast group can normally receive the data of the multicast service.
  • the present application further provides a method for communicating a multicast service, the method comprising: a first session management network element receiving a join request from a first terminal for requesting to join a multicast group corresponding to the multicast service, According to the joining request of the first terminal, tenth information for instructing the terminal to join the multicast group corresponding to the multicast service is sent to the mobility management network element.
  • the first session management network element may indicate the terminal and the multicast group to which the terminal joins to the mobility management network element, so that the mobility management network The element actively initiates paging of the terminal in the ilde state in the multicast group, which shortens the process of paging the terminal and improves the paging efficiency.
  • the tenth information may include identification information of the multicast service and a list of user equipment UEs corresponding to the multicast service, and the UE list includes identification information of terminals that join the multicast group corresponding to the multicast service; the The method further includes: the first session management network element adds the identification information of the first terminal to the UE list according to the joining request of the first terminal.
  • the first session management network element can send the UE list to the mobility management network element, so that the mobility management network element can page the terminal in the idle state in the UE list, which not only simplifies the paging process but also can page the terminal in the idle state.
  • Most of the terminals in the multicast group ensure that most of the terminals in the multicast group can normally receive the data of the multicast service.
  • the tenth information may include identification information of the multicast service and one or more of the following information: identification information of the first terminal, or identification information of a protocol data unit PDU session of the first terminal.
  • the first session management network element can only inform the mobility management network element of the information of the terminal and the information of the multicast group that the terminal has joined, so that the mobility management network element can learn that the terminal has joined the multicast group according to the information. group to simplify system design.
  • the present application provides a communication device
  • the communication device may be a first session management network element or a chip or a system-on-chip in the first session management network element, and may also be a communication device for implementing the first aspect or Any possible functional module for designing the method of the first aspect, or a functional module for implementing the fifth aspect or any possible designing for the method of the fifth aspect, or for implementing the seventh aspect or the seventh aspect Any possible design functional modules of the described method.
  • the communication apparatus may implement the functions performed by the communication apparatus in the above aspects or possible designs, and the functions may be implemented by executing corresponding software through hardware.
  • the hardware or software includes one or more modules corresponding to the above functions.
  • the communication apparatus may include: a processing unit, a receiving unit and a sending unit.
  • the receiving unit is used to receive the information of the multicast service corresponding to the first terminal from the mobile management network element, and the information may include transmission mode information and/or status information, wherein the transmission mode information can be used for Indicates the transmission mode of the multicast service, and the status information can be used to indicate that the multicast session corresponding to the multicast service is in a deactivated state; the first session management network element is based on the information of the multicast service corresponding to the first terminal.
  • a sending unit configured to send the first information including the QF information for transmitting the data of the multicast service for the first terminal to the mobility management network element.
  • the receiving unit is configured to receive the unicast QF information corresponding to the deletion of the multicast service and/or the eighth information of deactivating the unicast QF from the mobility management network element.
  • the sending unit is configured to send an N2 message to the access network device according to the eighth information; the access network device corresponds to the unicast QF, and the N2 message is used to instruct to modify the protocol data unit PDU session to which the unicast QF belongs.
  • the receiving unit is configured to receive a joining request from the first terminal for requesting to join a multicast group corresponding to the multicast service.
  • the sending unit is configured to send the tenth information for instructing the terminal to join the multicast group corresponding to the multicast service to the mobility management network element according to the joining request of the first terminal.
  • the communication apparatus may include: a processor and a communication interface.
  • the communication device may further include a memory for storing necessary computer-executed instructions and data of the communication device.
  • the processor executes the computer-implemented instructions stored in the memory to implement the above method.
  • the communication device for the specific implementation of the communication device, reference may be made to the first aspect or any possible design of the first aspect, or the method described in the fifth aspect or any possible design of the fifth aspect, or the seventh aspect or the third aspect.
  • the behavior function of the first session management network element in the method described in any possible design of the seven aspects will not be repeated.
  • a ninth aspect provides a communication device, the communication device may be a first session management network element or a chip or a system-on-chip in the first session management network element, the communication device includes one or more processors, one or more a memory. The one or more memories are coupled to the one or more processors for storing computer program code comprising computer instructions when the one or more processors execute the When the computer instructions are described, the communication device is caused to perform the method or the seventh aspect or the seventh aspect as described in the first aspect or any possible design of the first aspect or the fifth aspect or any possible design of the fifth aspect Any possible design of the described method.
  • a tenth aspect provides a computer program product comprising instructions that, when run on a computer, cause the computer to perform the first aspect or any possible design of the first aspect or the fifth aspect or any of the fifth aspects A possible design of the method or the method of the seventh aspect or any possible design of the seventh aspect.
  • a computer-readable storage medium may be a readable non-volatile storage medium, and instructions are stored in the computer-readable storage medium, when the computer-readable storage medium runs on a computer when the computer executes the method described in the first aspect or any possible design of the first aspect or the fifth aspect or any possible design of the fifth aspect or the seventh aspect or any possible design of the seventh aspect Design the method described.
  • the present application provides a communication device, which may be a mobility management network element or a chip or a system-on-chip in a mobility management network element, and may also be a communication device for implementing the second aspect or the second aspect Any possible design of a functional module of the method described in the third aspect or any possible functional module of the third aspect to design the described method, or any possible implementation of the fourth aspect or the fourth aspect A functional module for designing the method, or a functional module for implementing the sixth aspect or any possible design of the method in the sixth aspect.
  • the communication apparatus may implement the functions performed by the communication apparatus in the above aspects or possible designs, and the functions may be implemented by executing corresponding software through hardware.
  • the hardware or software includes one or more modules corresponding to the above functions.
  • the communication apparatus may include: a processing unit, a receiving unit and a sending unit.
  • the sending unit is configured to send the information of the multicast service corresponding to the first terminal to the first session management network element, and the information of the multicast service corresponding to the first terminal includes at least one of the following: transmission mode information , or state information, the transmission mode information is used to indicate the transmission mode of the multicast service, and the state information is used to indicate that the multicast session corresponding to the multicast service is in a deactivated state.
  • a receiving unit configured to receive first information from the first session management network element, where the first information includes QF information used for transmitting data of multicast services for the first terminal.
  • the receiving unit is configured to receive fourth information from the second session management network element for triggering activation of the transmission channel corresponding to the multicast service.
  • the processing unit is configured to acquire the transmission mode of the multicast service according to the fourth information.
  • the sending unit is used to send the QF information of the multicast service to the access network equipment according to the transmission mode of the multicast service, and the access network equipment is used to process the data transmitted on the transmission channel corresponding to the multicast service, and the QF information of the multicast service Data used to transmit multicast services.
  • the receiving unit is configured to receive sixth information from the second session management network element for triggering deactivation of the transmission channel corresponding to the multicast service.
  • the processing unit is configured to acquire the transmission mode of the multicast service according to the sixth information.
  • the sending unit is configured to send the seventh information to the access network device according to the sixth information when the transmission mode of the multicast service is the shared transmission mode; the access network device is used to process the data transmitted on the transmission channel corresponding to the multicast service. data; or, when the transmission mode of the multicast service is a unicast transmission mode, send eighth information to the first session management network element; wherein the seventh information is used to deactivate the transmission channel corresponding to the multicast service; the eighth information It is used to delete the unicast QF information corresponding to the multicast service and/or deactivate the unicast QF, and the unicast QF is used to transmit the data of the multicast service for a terminal in the multicast group corresponding to the multicast service.
  • the receiving unit is configured to receive ninth information that triggers the terminal in the multicast group corresponding to the paging multicast service.
  • the sending unit is configured to page the first terminal according to the ninth information, where the first terminal belongs to the multicast group corresponding to the multicast service.
  • the communication apparatus may include: a processor and a communication interface.
  • the communication device may further include a memory for storing necessary computer-executed instructions and data of the communication device.
  • the processor executes the computer-implemented instructions stored in the memory to implement the above method.
  • a thirteenth aspect provides a communication apparatus, which may be a mobility management network element or a chip or a system-on-chip in the mobility management network element, the communication apparatus comprising one or more processors and one or more memories.
  • the one or more memories are coupled to the one or more processors for storing computer program code comprising computer instructions when the one or more processors execute the When the computer instructions are described, cause the communication device to perform the method or the fourth aspect or the fourth aspect as described in the second aspect or any possible design of the second aspect or the third aspect or any possible design of the third aspect The method described in any possible design of the sixth aspect or the method described in any possible design of the sixth aspect.
  • a fourteenth aspect provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform the second aspect or any possible design of the second aspect or the third aspect or the third aspect.
  • a fifteenth aspect provides a computer-readable storage medium
  • the computer-readable storage medium may be a readable non-volatile storage medium
  • instructions are stored in the computer-readable storage medium, when the computer-readable storage medium runs on a computer when the computer executes the method described in the second aspect or any possible design of the second aspect or the third aspect or any possible design of the third aspect or the fourth aspect or any possible design of the fourth aspect Design the method or the sixth aspect or any possible design of the sixth aspect.
  • a sixteenth aspect further provides a communication system, which may include the communication device according to the eighth aspect and the communication device according to the twelfth aspect.
  • Fig. 1 is a schematic diagram of AMF-centric multicast service processing
  • Fig. 2 is a schematic diagram of multicast service processing centered on SMF
  • 3a is a schematic diagram of a unicast transmission mode
  • 3b is a schematic diagram of a shared transmission mode
  • FIG. 4 is a schematic diagram of the architecture of a communication system provided by an embodiment of the present application.
  • FIG. 5 is a schematic diagram of a 5G communication system according to an embodiment of the present application.
  • FIG. 6 is a schematic diagram of the composition of a communication apparatus 600 according to an embodiment of the present application.
  • FIG. 7 is a flowchart of a method for communicating a multicast service provided by an embodiment of the present application.
  • FIG. 8 is a flowchart of another method for communicating a multicast service provided by an embodiment of the present application.
  • FIG. 9a provides a method for establishing a transmission channel between an M-UPF and a UPF according to an embodiment of the present application
  • FIG. 9b is another method for establishing a transmission channel between the M-UPF and the UPF provided by the embodiment of the present application.
  • FIG. 10 is a flowchart of still another method for communicating a multicast service provided by an embodiment of the present application.
  • FIG. 11 is a flowchart of still another method for communicating a multicast service provided by an embodiment of the present application.
  • FIG. 12 is a flowchart of still another method for communicating a multicast service provided by an embodiment of the present application.
  • FIG. 13 is a flowchart of still another method for communicating a multicast service provided by an embodiment of the present application.
  • 15 is a flowchart of still another method for communicating a multicast service provided by an embodiment of the present application.
  • 16 is a flowchart of still another method for communicating a multicast service provided by an embodiment of the present application.
  • FIG. 17 is a schematic diagram of the composition of a communication apparatus 170 according to an embodiment of the present application.
  • FIG. 18 is a schematic diagram of the composition of a communication apparatus 180 according to an embodiment of the present application.
  • FIG. 19 is a schematic diagram of the composition of a communication system provided by an embodiment of the present application.
  • multicast services such as multicast broadcast service, MBS
  • SMF-centric multicast service processing flow SMF-centric multicast service processing flow
  • AMF-centric multicast service processing flow The two multicast service processing flows are introduced below:
  • FIG. 1 shows the SMF-centered multicast service processing flow.
  • the SMF in the SMF-centered multicast service processing flow, the SMF can receive the join message sent by the UE through the PDU session modification message or the PDU session establishment message. The join request of the multicast group corresponding to the multicast service. After the SMF receives the join request of the UE, on the one hand, the SMF can generate the unicast quality of service flow (QoS flow, QF) information corresponding to the multicast service, and the corresponding multicast service. On the other hand, SMF can perform network authentication on the join request of the UE, and decide the current transmission mode of the UE for the multicast service according to the feedback of the access network equipment. .
  • QoS flow unicast quality of service flow
  • the SMF-centric solution conforms to the separation principle of mobility management-session management (MM-SM) in the 5G architecture design principles
  • the SMF needs to perform signaling interaction with the access network equipment.
  • the feedback from the network access device decides the current transmission mode of the UE for the multicast service, the process is complicated and the signaling overhead is relatively large.
  • FIG. 2 shows the AMF-centric multicast service processing flow.
  • the AMF can receive the corresponding multicast service sent by the user equipment (UE) through the radio access network (RAN). After receiving the joining request of the UE, the AMF can perform network authentication on the joining request of the UE, and decide the current transmission mode of the UE for the multicast service.
  • UE user equipment
  • RAN radio access network
  • the AMF can determine the transmission mode of the multicast service without signaling interaction with other network elements, and when the multicast session needs to be activated, the AMF can save the relevant information about the UE's registration area according to the current , to calculate the paging area of the UE conveniently and quickly, and page the UE.
  • the AMF-centric approach not only undermines the Mobility Management-Session Management (MM-SM) separation principle in the 5G architecture design principles.
  • the AMF-centric solution does not establish/generate a unicast quality of service flow (QoS flow, QF) corresponding to the multicast service.
  • QoS flow QF
  • the target RAN When the UE switches to a RAN that does not have multicast capability, since the target RAN cannot recognize and handle multicast services, it can only forward data from the source RAN through a unicast PDU session and send data from the target RAN to the UE through a unicast PDU session. Since multicast is not associated with unicast, in this case, the source RAN does not know how to forward data to the target RAN, which will result in data loss of the multicast service and cannot guarantee the continuity of the multicast service.
  • a method for communicating a multicast service is provided.
  • the state information of the multicast session is indicated to the first session management network element, and the first session management network element generates QF information corresponding to the multicast service according to the instruction of the mobility management network element, and indicates the QF information corresponding to the multicast service to the mobility management network. Yuan. That is, the first session management network element establishes transmission resources corresponding to the multicast service through signaling interaction with the mobility management network element. In this way, the first session management network element can determine the transmission mode of the multicast service without interacting with the access network device. , and then the transmission mode establishes resources corresponding to the multicast service, etc., so as to reduce the signaling overhead.
  • the first session management network element can also establish a transmission resource (or session) for transmitting the data of the multicast service for the terminal as needed according to the instruction of the mobility management network element, such as establishing a unicast QF in the unicast transmission mode, Multicast QF is established in shared transport mode. In this way, unnecessary waste of resources caused by the core network device still trying to establish a multicast transmission channel (such as a multicast session) in the unicast transmission mode is avoided.
  • the transmission mode of the multicast service may refer to the transmission mode of the data of the multicast service on the N3 link between the user plane network element and the access network device.
  • it includes two delivery modes: unicast delivery mode (Individual delivery mode) and shared delivery mode (Shared delivery mode).
  • unicast delivery mode Individual delivery mode
  • shared delivery mode Shared delivery mode
  • the unicast transmission mode may also be referred to as the fifth generation ( 5th generation, 5G) core network individual multicast/broadcast service traffic delivery (5GC Individual MBS traffic delivery) mode.
  • Access network equipment using unicast transmission mode may not have multicast capability.
  • the unicast transmission mode may refer to that after the multicast user plane network element (such as the multicast user plane function (multicast UPF, M-UPF)) receives the multicast service data sent by the application server, it sends the multicast service data to the unicast service.
  • the user plane network element such as UPF
  • the UPF sends the data of the multicast service to the access network equipment in the point-to-point transmission mode.
  • the point-to-point transmission method send the data of the multicast service to one or more terminals in a point-to-multipoint manner.
  • Fig. 3a is a schematic diagram of a unicast transmission mode
  • the transmission channels on the air interface side from the UPF to the RAN and from the RAN to the UE are used by one UE, for example, the M-UPF receives the multicast service
  • the data is sent to the UPF corresponding to the UE, the UPF sends the data of the multicast service to the RAN, and the RAN sends the data to the UE through one-to-one transmission.
  • the shared transmission mode can also be referred to as the 5G Core Network Shared Multicast/Broadcast Service Traffic Delivery (5GC Shared MBS traffic delivery).
  • Access network equipment using shared transmission mode can have multicast capability.
  • the shared transmission mode may refer to that after the multicast user plane network element (such as the multicast user plane function (multicast UPF, M-UPF)) receives the multicast service data sent by the application server, it sends the multicast service data to the receiver.
  • the network access device after receiving the data of the multicast service, sends the data of the multicast service to multiple terminals in a point-to-multipoint manner.
  • Fig. 3b it is a schematic diagram of a shared transmission mode.
  • the air interface side transmission channels from M-UPF to RAN and from RAN to UE are shared by multiple UEs in the multicast group.
  • UE a, UE b, UE c of the multicast group M-UPF will transmit a multicast service data to the RAN.
  • the RAN After the RAN receives the multicast service data, the RAN transmits a multicast service data.
  • UEa Both UEb and UEc will receive the data of the multicast service.
  • the communication system may include multiple terminals (such as a first terminal, etc.), access network equipment, and mobility management network elements and a first session management function network element. Further, the communication system shown in FIG. 4 may further include a first user plane function network element, a second session management function network element, a second user plane function network element, a policy control network element, a network storage network element, and a data network (data network element).
  • network, DN may include an application server (application server, AS) and the like.
  • the first user plane function network element, the second session management function network element, the second user plane function network element, and the DN are optional network elements in this application.
  • multiple terminals can form a multicast group, and multiple terminals can simultaneously receive the same data, that is, the data of the multicast service.
  • the first user plane function network element can be used to transmit unicast data (unicast data), and can also be used to transmit data of multicast services, and the second user plane function network element can be used to transmit data of multicast services (multicast data), Unicast data may be data sent to a specific terminal or user, and multicast service data may be data sent to a multicast group.
  • the first session management function network element may be a session management function network element for managing PDUs, which may be referred to as a unicast session management network element
  • the second session management function network element may be a session management function network element for managing multicast services, which may be referred to as Manage network elements for multicast sessions.
  • the network elements or devices involved in the architecture shown in FIG. 4 are introduced below.
  • a terminal may be called a terminal equipment (terminal equipment) or a user equipment (user equipment, UE) or a mobile station (mobile station, MS) or a mobile terminal (mobile terminal, MT).
  • the terminal in FIG. 1 may be a mobile phone (mobile phone), a tablet computer or a computer with wireless transceiver function, and may also be a virtual reality (virtual reality, VR) terminal, an augmented reality (augmented reality, AR) terminal, industrial Wireless terminals in control, wireless terminals in unmanned driving, wireless terminals in telemedicine, wireless terminals in smart grids, wireless terminals in smart cities, smart homes, vehicle-mounted terminals, etc.
  • VR virtual reality
  • AR augmented reality
  • Access network equipment is mainly used to implement functions such as physical layer functions, resource scheduling and management, terminal access control, and mobility management.
  • the access network device may be a device supporting wired access or a device supporting wireless access.
  • the access network device may be an access network (access network, AN)/radio access network (radio access network, RAN), which is composed of multiple 5G-AN/5G-RAN nodes.
  • 5G-AN/5G-RAN nodes can be: access point (AP), base station (nodeB, NB), enhanced base station (enhance nodeB, eNB), next-generation base station (NR nodeB, gNB), transmission and reception A transmission reception point (TRP), a transmission point (TP), or some other access node, etc.
  • Mobility management network element is mainly responsible for terminal access authentication, mobility management, signaling interaction between various functional network elements, such as: user registration status, user connection status, user registration and access to the network, tracking area update, Cell handover user authentication and key security are managed.
  • the session management function network element is mainly used to realize the user plane transmission logical channel, such as: the establishment, release and modification of a packet data unit (PDU) session or a multicast session and other session management functions.
  • PDU packet data unit
  • the user plane function network element can be used as the anchor point on the user plane transmission logical channel to complete functions such as routing and forwarding of user plane data, such as: establishing a channel with the terminal (that is, the user plane transmission logical channel), in this channel It forwards the data packets between the terminal and the DN, and is responsible for data packet filtering, data forwarding, rate control, and generation of charging information for the terminal.
  • the policy control network element can be used to provide policies for mobility management network elements and session management function network elements, such as: quality of service (quality of service) policy, slice selection policy, and so on.
  • quality of service quality of service
  • slice selection policy slice selection policy
  • the network storage network element can be used to store user data, such as: user subscription information, authentication or authorization data, etc.
  • the network storage network element may be a unified data management network element (unified data management, UDM), a network storage function (network repository function, NRF), or a unified database (unified data repository, UDR), etc.
  • an operator network that can provide users with data transmission services, such as an operator network that can provide users with IP multimedia services (IP multi-media service, IMS).
  • IP multimedia services IP multi-media service, IMS.
  • An application server (or called an application function (AF)) may be deployed in the DN, and the application server may provide data transmission services to users.
  • AF application function
  • FIG. 4 is only an exemplary architecture diagram, in addition to the functional units shown in FIG. 4 , the system may also include other functional network elements, such as: operation and management (operation and management, O&M) network elements, etc., This embodiment of the present application does not limit this.
  • O&M operation and management
  • the names of each device in FIG. 4 are not limited.
  • each device can also be named with other names, such as replacing the name of a network element with the same or similar functions, which is not limited.
  • the system shown in FIG. 4 may be a 3rd generation partnership project (3GPP) communication system, such as a 4th generation (4G) communication system, a long term evolution (long term evolution, LTE) system, It can also be a fifth-generation (5th generation, 5G) communication system, a new radio (NR) system, a next-generation communication system, etc., or a non-3GPP communication system, which is not limited.
  • 3GPP 3rd generation partnership project
  • 4G 4th generation
  • LTE long term evolution
  • 5G fifth-generation
  • NR new radio
  • next-generation communication system etc.
  • non-3GPP communication system which is not limited.
  • the network element or entity corresponding to the second session management function network element may be a multicast in the 5G communication system.
  • Session management function multicast session management function, M-SMF
  • the network element or entity corresponding to the above-mentioned second user plane function network element may be a multicast user plane function (multicast broadcast user plane function, M-) in the 5G communication system -UPF).
  • the network element or entity corresponding to the access network device may be the radio access network (RAN) in the 5G communication system
  • the network element or entity corresponding to the mobility management network element may be the access and mobility in the 5G communication system.
  • AMF and the policy control function can be the policy control function (PCF) in the 5G communication system.
  • PCF policy control function
  • the SMF and the M-SMF may be co-located, or may be deployed independently, without limitation.
  • the UPF and the MB-UPF may be co-located or independently deployed, without limitation.
  • the session management function network element, the access network device, and the mobility management network element in the embodiment of the present application may also be referred to as a communication device, which may be a general-purpose device or a dedicated device.
  • a communication device which may be a general-purpose device or a dedicated device.
  • the related functions of the session management function network element, the user plane function network element, the access network device, and the mobility management network element in the embodiment of the present application may be implemented by one device, or may be implemented jointly by multiple devices. It may be implemented by one or more functional modules in a device, which is not specifically limited in this embodiment of the present application.
  • the above-mentioned functions may be either network elements in hardware devices, or software functions running on dedicated hardware, or a combination of hardware and software, or virtualization instantiated on a platform (eg, a cloud platform) Function.
  • each device shown in FIG. 4 may adopt the composition structure shown in FIG. 6 , or include the components shown in FIG. 6 .
  • FIG. 6 is a schematic diagram of the composition of a communication apparatus 600 according to an embodiment of the present application.
  • the communication apparatus 600 may include a processor 601 and a memory 604 .
  • the communication device 600 may further include a communication line 602 and a communication interface 603 .
  • the processor 601 , the memory 604 and the communication interface 603 may be connected through a communication line 602 .
  • the processor 601 may be a central processing unit (central processing unit, CPU), a general-purpose processor, a network processor (network processor, NP), a digital signal processor (digital signal processing,
  • CPU central processing unit
  • NP network processor
  • NP digital signal processor
  • DSP digital signal processor
  • microprocessor microcontroller
  • PLD programmable logic device
  • the processor 601 may also be other devices with processing functions, such as circuits, devices or software modules, which are not limited.
  • the communication line 602 is used to transmit information between the components included in the communication device 600 .
  • the communication interface 603 is used to communicate with other devices or other communication networks.
  • the other communication network may be Ethernet, radio access network (RAN), wireless local area networks (WLAN) and the like.
  • Communication interface 603 may be a module, circuit, transceiver, or any device capable of enabling communication.
  • Memory 604 for storing instructions.
  • the instructions may be computer programs.
  • the memory 604 may be a read-only memory (ROM) or other types of static storage devices that can store static information and/or instructions, or a random access memory (RAM) or a random access memory (RAM).
  • ROM read-only memory
  • RAM random access memory
  • RAM random access memory
  • RAM random access memory
  • EEPROM electrically erasable programmable read-only memory
  • CD- ROM compact disc read-only memory
  • optical disc storage including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs
  • magnetic disk storage media and other magnetic storage devices, without limitation.
  • the memory 604 may exist independently of the processor 601 , or may be integrated with the processor 601 .
  • the memory 604 may be used to store instructions or program code or some data or the like.
  • the memory 604 may be located in the communication device 600, or may be located outside the communication device 600, which is not limited.
  • the processor 601 is configured to execute the instructions stored in the memory 604 to implement the communication methods provided by the following embodiments of the present application. For example, when the communication device 600 is a first session management function network element or a chip or a system-on-chip in the first session management function network element, the processor 601 executes the instructions stored in the memory 604 to implement the following embodiments of the present application. Steps performed by the first session management function network element. For another example, when the communication apparatus 600 is an access network device or a chip or a system-on-chip in the access network device, the processor 601 may execute the instructions stored in the memory 604 to implement the access network device in the following embodiments of the present application steps performed.
  • processor 601 may include one or more CPUs, such as CPU0 and CPU1 in FIG. 6 .
  • the communication apparatus 600 includes a plurality of processors, for example, in addition to the processor 601 in FIG. 6 , a processor 607 may also be included.
  • the communication apparatus 600 further includes an output device 605 and an input device 606 .
  • the input device 606 is a device such as a keyboard, a mouse, a microphone or a joystick
  • the output device 605 is a device such as a display screen, a speaker, and the like.
  • the communication apparatus 600 may be a desktop computer, a portable computer, a network server, a mobile phone, a tablet computer, a wireless terminal, an embedded device, a chip system or a device with a similar structure in FIG. 6 .
  • the composition shown in FIG. 6 does not constitute a limitation on the communication device, and in addition to the components shown in FIG. 6 , the communication device may include more or less components than those shown in the figure, or combine some components , or a different component arrangement.
  • the chip system may be composed of chips, or may include chips and other discrete devices.
  • the communication method provided by the embodiment of the present application will be described below with reference to the communication system shown in FIG. 4 .
  • Each network element in the following embodiments may have the components shown in FIG. 6 , which will not be repeated.
  • the actions, terms, etc. involved in the various embodiments of the present application may refer to each other, and are not limited.
  • the names of the messages or the names of parameters in the messages exchanged between the devices are just an example, and other names may also be used in the specific implementation, which is not limited.
  • the multicast described in the embodiments of this application may be replaced by terms such as broadcast, multicast, multicast communication, multicast/broadcast, or multicast/broadcast.
  • the determination in the embodiments of this application can also be understood as creating (create) or generating (generating). The embodiment does not specifically limit this.
  • FIG. 7 is a method for communicating a multicast service provided by an embodiment of the present application. As shown in FIG. 7 , the method may include:
  • the mobility management network element sends the information of the multicast service corresponding to the first terminal to the first session management network element.
  • the first session management network element receives the information of the multicast service corresponding to the first terminal.
  • the first terminal may be a terminal that joins the multicast group corresponding to the multicast service in FIG. 4 .
  • the terminals that join the multicast group corresponding to the multicast service may include terminals that are to be joined to the multicast group corresponding to the multicast service, or terminals that have joined the multicast group corresponding to the multicast service. be restricted.
  • the terminal to be added to the multicast group corresponding to the multicast service may refer to a join request (jion request) requesting to join the multicast group corresponding to the multicast service, but has not been confirmed or authenticated by the network side device terminal.
  • the terminal that has joined the multicast group corresponding to the multicast service may refer to a terminal that has sent a request to join the multicast group corresponding to the multicast service and has been authenticated by the network.
  • the mobility management network element may be the mobility management network element corresponding to the first terminal in FIG. 4 , and the mobility management network element is used as the termination point of the non-access stratum (non-access stratum, NAS) signaling of the first terminal, using For managing/processing the NAS signaling of the first terminal, for example, the mobility management network element may be responsible for encrypting and protecting the integrity of the NAS message of the first terminal.
  • NAS non-access stratum
  • the first session management network element may be a session management network element that manages a protocol data unit (protocol data unit, PDU) session of the first terminal among the session management network elements connected to the mobility management network element.
  • the first session management network element may be referred to as a unicast session management network element.
  • the multicast service may be a type of service oriented to a multicast group or multiple terminals, and the recipient of the data of the multicast service may be a group of terminals, and these terminals are authorized to receive the data.
  • the multicast service can be an order issued by the same command center for a fleet or a TV program for multiple viewers.
  • the information of the multicast service corresponding to the first terminal may be information for the first terminal, and the information may be used to determine the QF information of the data of the multicast service transmitted for the first terminal.
  • the information of the multicast service corresponding to the first terminal may include at least one of the following: transmission mode information, or status information, and may also include other information, for example, the information of the multicast service corresponding to the first terminal may also include multicast Identification information for the business.
  • the transmission mode information may be used to directly indicate/indirectly indicate whether the transmission mode of the multicast service is the unicast transmission mode shown in FIG. 3a or the shared transmission mode shown in FIG. 3b.
  • the transmission mode of the multicast service may be determined according to capability information of the access network device corresponding to the first terminal (for example, whether the access network device has the multicast capability).
  • the transmission mode information may include the transmission mode of the multicast service and/or the capability information of the access network device corresponding to the first terminal, that is, the transmission mode information may include the transmission mode of the multicast service itself, or the information used for the transmission mode of the multicast service.
  • the capability information of the access network device that determines the transmission mode of the multicast service may also include the transmission mode of the multicast service and the capability information of the access network device, which is not limited.
  • the information of the multicast service corresponding to the first terminal may not include transmission mode information.
  • the transmission mode may be the unicast transmission mode or the shared transmission mode by default.
  • the access network device corresponding to the first terminal may refer to an access network device accessed by the first terminal, or an access network device corresponding to a cell where the first terminal currently resides, or an access network where the first terminal currently resides. equipment, etc.
  • the capability information of the access network device may indicate whether the access network device has the multicast capability.
  • the multicast capability of an access network device may refer to one or more of the following functions:
  • the access network device supports the transmission of multicast service data through the method shown in Figure 3b, and supports communication with the core network control plane network elements for multicast service
  • the enhancement of the interaction on the signaling plane supports the reception of multicast service data from the core network user plane network elements, supports the local processing of multicast service data, supports the air interface to send multicast service data through point-to-multipoint, and configures the response terminal Receive data for multicast services.
  • the fact that the access network device does not have the multicast capability may mean that the access network device does not support the transmission of multicast service data in the manner shown in FIG. 3b, but only supports the transmission of multicast service data in the manner shown in FIG. 3a.
  • the capability information of the access network device may include the specific multicast capability of the access network device or the access network device does not have the multicast capability, and may also include indication information corresponding to the multicast capability of the access network device.
  • the indication information Indicates the multicast capability of the access network device.
  • the indication information can be binary bit 0 or 1. If the indication information is binary bit 0, it means that the access network device has multicast capability. If the indication information is binary bit 1, it means that Access network equipment does not have multicast capability.
  • the state information may be used to indicate that the multicast session corresponding to the multicast service is in a deactivated state.
  • the state information may include that the multicast session is in the deactivated state (multicast session deactivation) or the multicast/broadcast service session is deactivated (MBS session). deactivation), it can also include the indication information corresponding to the deactivation state, such as the indication information is binary bit 0 or 1, if the indication information is binary bit 0, it means deactivation, if the indication information is binary bit 1, it means multicast Session is active.
  • the information of the multicast service corresponding to the first terminal may not include state information, and at this time, by default, the multicast session corresponding to the multicast service is in a deactivated state or an activated state.
  • the identification information of the multicast service may be used to identify the multicast service, and the identification information of the multicast service may be configured by the application layer of the terminal.
  • the identification information of the multicast service can be equivalently replaced with the identification information of the multicast group corresponding to the multicast service (such as a temporary multicast group identifier (TMGI)), or, an application that provides multicast service data
  • IP Internet Protocol
  • service ID service identifier
  • SDF information of the multicast service Service data flow identification rules
  • MSS ID multicast/broadcast service identifier
  • MSS session ID multicast/broadcast service session Identification
  • the multicast session in the deactivated state may include one or more of the following: information related to the multicast service (for example, quality of service (QoS) information of the multicast service or QF information, etc.) Released in the terminal; multicast service-related information (eg, multicast service-related context (eg, multicast context (MB context) or multicast service session context (MBS session context) or multicast group context (MB) group context) or multicast service context (MBS context) is released at the access network device; tunnel information related to the multicast session is released; air interface resources related to the multicast session are released; The information related to the multicast service in the context is released, etc.; the information related to the multicast service (such as MBS session context or MB service context) is reserved in the first session management network element and the second session management network element but is set to go.
  • multicast service-related information eg, multicast service-related context (eg, multicast context (MB context) or multicast service session context (MBS session context) or multicast group
  • Active state or the information related to the multicast service is reserved in the first session management network element but set to the deactivated state
  • the information related to the multicast service is released in the second session management network element, or the related information of the multicast service is in the deactivated state.
  • the first session management network element is released, but the information related to the multicast service is retained in the second session management network element but is set to a deactivated state, etc.
  • the multicast session in the active state may include one or more of the following: a terminal
  • the information related to the multicast service (such as QoS information or QF information of the multicast service, etc.) is stored in the access network device;
  • the context related to the multicast service (such as the multicast context (MB context) or the multicast service) is stored in the access network device.
  • MBS session context multicast group context
  • MBS context multicast service context
  • MBS context multicast service context
  • MBS context multicast service context
  • MBS context multicast service context
  • MBS context multicast service context
  • MBS context multicast service context
  • the mobility management network element determines that the first terminal joins the multicast group corresponding to the multicast service
  • the mobility management network element is triggered to acquire capability information of the access network device corresponding to the first terminal and/or determine the multicast
  • the multicast session state deactivated or activated
  • determine the transmission mode according to the capability information of the access network device design the transmission mode information and/or set the state information according to the determined multicast session state, and execute S701.
  • the process of determining the transmission mode by the mobility management network element and determining the state of the multicast session corresponding to the multicast service reference may be made to the description in the embodiment corresponding to FIG. 8 .
  • the mobility management network element may determine that the first terminal joins the multicast group corresponding to the multicast service in the following manner:
  • Manner 1.1 The mobility management network element receives a join request from the first terminal, and determines according to the join request that the first terminal joins the multicast group corresponding to the multicast service.
  • the join request may be used to request to join the multicast group corresponding to the multicast service.
  • the join request may carry the identification information of the multicast service, and may also carry the identification information of the first terminal and other information, such as a join indication, and the join indication may be used to indicate that a terminal wants to join a certain group.
  • the join request may be carried in different messages. For example, in manner 1.1, the join request is carried in a NAS message or an N2 message.
  • the N2 message may be a PDU session resource modification request (PDU session resource modify request) message, which belongs to/corresponds to a PDU session resource modification request transfer (PDU session resource modify request transfer) message
  • the NAS message may be an uplink NAS transfer message. , or other dedicated messages designed for multicast join requests.
  • the identification information of the first terminal may be used to identify the first terminal.
  • the identification information of the first terminal may be an IP address of the first terminal, a media access control (media access control, MAC) address of the first terminal, or an international mobile subscriber identity (international mobile subscriber identity) of the first terminal.
  • IMSI media access control
  • MAC media access control
  • SUPI permanent identification information
  • temporary identification information 5G global user temporary identifier, 5G-GUTI
  • the mobility management network element may also send the join request or the indication information used to instruct the first terminal to join the multicast group corresponding to the multicast service to the first session management network element, to indicate the first session management network element.
  • a first terminal of a session management network element joins the multicast group corresponding to the multicast service.
  • the first terminal sends a PDU session modification request (PDU session modification request) or a PDU session establishment request (PDU session establishment request) carrying a join request to the first session management network element through the mobility management network element.
  • the first session management network element receives the PDU session establishment request or the PDU session establishment request, determines that the first terminal joins the multicast group corresponding to the multicast service according to the PDU session establishment request or the PDU session modification request, and sends the join request to the mobility management network element Or the indication information used to instruct the first terminal to join the multicast group corresponding to the multicast service, so as to instruct the first terminal to join the multicast group corresponding to the multicast service.
  • the mobility management network element receives the join request or indication information sent by the first session management network element, and determines that the first terminal joins the multicast group corresponding to the multicast service.
  • the function and carried content of the join request are the same as those in Mode 1.1, and will not be repeated.
  • the join request may be carried in the transparent container of the PDU session establishment request or the PDU session modification request.
  • the transparent container corresponds to the first session management network element and can only be parsed/identified by the first session management network element.
  • the first terminal sends a NAS message to the mobility management network element, where the NAS message may include a join request, and a PDU session establishment request or a PDU session modification request carrying the join request.
  • the mobility management network element receives the NAS message from the first terminal, and determines, according to the join request included in the NAS message, that the first terminal joins the multicast group corresponding to the multicast service.
  • the mobility management network element determines the first session management network element according to the PDU session establishment request or the PDU session modification request contained in the NAS message, and sends the PDU session establishment request or PDU session carrying the join request to the first session management network element. Modifying the request, so that the first session management network element determines the data for the first terminal to join the multicast service according to the PDU session establishment request or the join request carried in the PDU session modification request.
  • the mobility management network element may include the identification information of the multicast service in the message carrying the PDU session establishment request or the PDU session modification request to the first session management network element.
  • Mode 1.3 The function and content of adding a request in Mode 1.3 are the same as those in Mode 1.1, and will not be repeated.
  • the first session management network element sends the first information to the mobility management network element according to the information of the multicast service corresponding to the first terminal.
  • the mobility management network element receives the first information from the first session management network element.
  • the first information may include a quality of service flow for transmitting the data of the multicast service for the first terminal
  • the QF information may be used to establish a QF for transmitting data of a multicast service, the QF belonging to a session for transmitting data of a multicast service.
  • the content included in the first information is determined according to the content included in the information of the multicast service corresponding to the first terminal. Specifically, it can include the following situations:
  • the information of the multicast service corresponding to the first terminal includes transmission mode information.
  • the access network device corresponding to the first terminal When the transmission mode information indicates that the transmission mode of the multicast service is the unicast transmission mode, the access network device corresponding to the first terminal does not have the multicast function (or does not support MBS), and the first information may include multicast. Unicast QF information corresponding to the service. Or, when the transmission mode information indicates that the transmission mode of the multicast service is the shared transmission mode, the first terminal corresponding to the access network device has a multicast function (or is referred to as supporting MBS), and at this time, the first information may include the correspondence of the multicast service. multicast QF information.
  • the first information may also include unicast QF information corresponding to the multicast service, and/or, include the unicast QF information corresponding to the multicast service and the multicast service.
  • the association between the multicast QF information corresponding to the service when the first terminal moves to the coverage area of the access network equipment without the multicast service, the unicast QF information corresponding to the multicast service can be obtained according to the first information, and the unicast QF can be established, and the unicast QF can be sent to the terminal through the unicast QF.
  • the data of the multicast service is transmitted to ensure the continuity of the transmission of the multicast service.
  • the second case the information of the multicast service corresponding to the first terminal includes status information.
  • the first information includes multicast QF information corresponding to the multicast service and unicast QF information corresponding to the multicast service.
  • the information of the multicast service corresponding to the first terminal includes status information and transmission mode information.
  • the first session management network element determines that the multicast session corresponding to the multicast service is in the deactivated state according to the state information, the first session management network element is not sure when the multicast session is reactivated, and is not sure when the multicast session is reactivated Whether the access network device still has the multicast capability, at this time, the first session management network element only uses the multicast session being in the deactivated state as a triggering condition, and triggers the first session management network element to move to the mobile phone only according to the current transmission mode information.
  • the management network element sends the first information.
  • the first information when the transmission mode information indicates that the transmission mode of the multicast service is the unicast transmission mode, the first information includes the unicast QF information corresponding to the multicast service; or, when the transmission mode information indicates that the transmission mode of the multicast service is the shared transmission mode , the first information includes multicast QF information corresponding to the multicast service, so as to activate the multicast session.
  • the multicast QF information corresponding to the multicast service may be used to establish a multicast session corresponding to the multicast service, or used to establish transmission resources for transmitting the multicast session corresponding to the multicast service.
  • the multicast QF information corresponding to the multicast service may include one or more of the following: identification information of the multicast QF (such as the multicast QFI), identification information of the multicast context, and QoS parameters corresponding to the multicast QF (such as the multicast QFI) One or more of QF identification information, delay budget or error rate, etc.), tunnel information corresponding to the data of multicast services, quality of service (QoS) templates of multicast services (such as QoS description information or QoS) configuration file, etc.), description information of multicast services, and list of UEs.
  • identification information of the multicast QF such as the multicast QFI
  • identification information of the multicast context such as the multicast context
  • QoS parameters corresponding to the multicast QF such as the multicast QFI
  • the multicast QF may be the QF included in the multicast session and used for transmitting the data of the multicast service
  • the identification information of the multicast context may be the identification information of the multicast group.
  • the tunnel information corresponding to the data of the multicast service may be used to identify the tunnel for transmitting the data of the multicast service.
  • the QoS profile of the multicast service can be used to indicate the transmission requirements of the multicast service.
  • the QoS profile of the multicast service can include but is not limited to the priority of the multicast service, the bit error rate information of the multicast service, and the packet loss of the multicast service. rate information, delay information of multicast services, etc.
  • the description information of the multicast service can be used to indicate whether the multicast service supports the unicast transmission mode, etc.
  • the UE list may be used to indicate terminals that have joined the multicast group corresponding to the multicast service. For example, the UE list may include identification information of terminals that have joined the multicast group corresponding to the multicast service
  • the unicast QF information corresponding to the multicast service may be used to establish or indicate the transmission resources used to transmit the multicast service in the unicast session corresponding to the multicast service.
  • the broadcast QF information can be used to establish a certain unicast QF, or used to indicate a QF that can be used to transmit data of multicast services in the established unicast QF.
  • the unicast session corresponds to the first terminal, the unicast session may be referred to as a PDU session of the first terminal, and the PDU session of the first terminal is used to transmit data of a multicast service.
  • the unicast QF information corresponding to the multicast service may include one or more of the following: unicast QF identification information (such as unicast QFI), QoS parameters corresponding to unicast QF (such as unicast QF identification information, delay One or more items such as budget or error rate), tunnel information corresponding to unicast QF, QoS template of unicast QF (such as QoS description information or QoS configuration file)).
  • the unicast QF may be the QF included in the PDU session of the first terminal for transmitting the data of the multicast service.
  • the tunnel information corresponding to the unicast QF may be used to identify the tunnel for transmitting the data of the multicast service to the first terminal in the unicast transmission mode.
  • the QoS profile of unicast QF can be used to indicate the transmission requirements when transmitting data of multicast services through unicast transmission mode.
  • the QoS profile of unicast QF can include but not limited to priority, bit error rate information, packet loss rate information, delay information, etc.
  • the unicast QF and multicast QFs with the same/matching QoS parameters in the unicast QF corresponding to the multicast service and the multicast QF corresponding to the multicast service.
  • the unicast QF and the multicast QF having the same/matching QoS parameters may correspond to each other, and there is an association relationship between them, and their QF information has an association relationship.
  • the association relationship between the unicast QF information corresponding to the multicast service and the multicast QF information corresponding to the multicast service may include: the identification information of the unicast QF (such as the unicast QFI) and the information of the multicast QF corresponding to the unicast QF.
  • the association relationship between the identification information may also include the association relationship between the tunnel information corresponding to the unicast QF and the tunnel information corresponding to the multicast QF corresponding to the unicast QF.
  • a piece of unicast QF information corresponding to a multicast service may carry the multicast QF information corresponding to the corresponding multicast service to indicate the unicast QF information corresponding to the multicast service and the multicast QF corresponding to the multicast service relationship between information.
  • the unicast QF information corresponding to the multicast service is carried in the PDU session resource modify request message
  • the PDU session resource modify request message carries the QoS Flow Identifier cell
  • the QoS Flow Identifier cell is a unicast QFI, which It includes MBS QoS Flow Identifier (i.e. multicast QFI) and TMGI (i.e. identification information of multicast service) to indicate that there is an association between the unicast QFI and the multicast QFI.
  • MBS QoS Flow Identifier i.e. multicast QFI
  • TMGI i.e. identification information of multicast service
  • the transmission mode of the multicast service is the unicast transmission mode, it means that the access network equipment does not have the multicast capability and cannot identify the multicast QF information corresponding to the multicast service and the unicast corresponding to the multicast service.
  • the first information may carry the association between the multicast QF information corresponding to the multicast service and the unicast QF information corresponding to the multicast service, or may not carry the association , without restriction.
  • the sending the first information by the first session management network element to the mobility management network element may include: the first session management network element carries the first information in an N11 message and sends it to the mobility management network element.
  • the mobility management network element receives the N11 message carrying the first information, and obtains the first information from the received N11 message.
  • the N11 message may be a service interface (Nsmf)_PDU session update session management context response (Nsmf_PDUSession_UpdateSMContext response) message between the SMF and the AMF, or may be other new N11 messages that appear with the development of communication technologies, which are not described here. be limited.
  • Nsmf service interface
  • Nsmf_PDUSession_UpdateSMContext response session management context response
  • the mobility management network element may save the first information after receiving the first information.
  • the identification information of the multicast service and all or part of the QF information included in the first information may be stored correspondingly.
  • the mobility management network element may store the corresponding relationship between the unicast QF information corresponding to the multicast service and the first terminal, for example, corresponding to the storage of the unicast QF information corresponding to the multicast service.
  • the unicast QF information and the identification information of the first terminal or save the unicast QF information corresponding to the multicast service in the UE context of the first terminal in the mobility management network element, or save the unicast QF information corresponding to the multicast service In the context of the multicast session corresponding to the multicast service.
  • the method may further include:
  • the mobility management network element sends the first information to the access network device.
  • the access network device receives the first information, and then obtains a QF for transmitting multicast services for the first terminal according to the first information, such as establishing a QF for transmitting multicast services for the first terminal or selecting a QF for transmitting multicast services for the first terminal from the established QFs.
  • the first terminal transmits the QF and so on of the data of the multicast service.
  • the access network device may be an access network device corresponding to the first terminal, an access network device currently accessed by the first terminal, and the first terminal currently resides in the coverage area of the access network device.
  • S703 is an optional step.
  • the mobility management network element may send the first information to the access network device, for example, to the access network device.
  • the network device sends the unicast QF information corresponding to the multicast service.
  • the information corresponding to the multicast service may also be sent to the access network device. The association between the unicast QF information and the multicast QF information corresponding to the multicast service.
  • the mobility management network element may not send the first information to the access network device, and keep the multicast session in a deactivated state.
  • the mobility management network element sending the first information to the access network device may include the mobility management network element sending all the information in the first information received from the first session management network element to the access network device, Part of the information in the first information may also be sent to the access network device, which is not limited.
  • the mobility management network element After the mobility management network element receives the first information sent by the first session management network element, if the first information includes the unicast QF information corresponding to the multicast service and the multicast QF information corresponding to the multicast service, the mobility management network element will According to whether the transmission mode is the unicast transmission mode, or according to the capability information of the access network device, it can be determined that the transmission mode is the unicast transmission mode, and only the unicast QF information corresponding to the multicast service included in the first information is sent to the access network device.
  • the method shown in FIG. 7 may include establishing a transmission channel between the access network device and the user plane network element for transmitting the data of the multicast service. If the transmission mode is the shared transmission mode and the transmission channel for transmitting the data of the multicast service between the access network device and the multicast user plane function (such as M-UPF) is not established, the method described in FIG. 7 may further include establishing The transmission channel between the access network equipment and the M-UPF. Specifically, for the process of establishing a transmission channel, reference may be made to the description in the embodiment corresponding to FIG. 8 .
  • the mobility management network element may indicate the transmission mode information corresponding to the multicast service and/or the state information of the multicast session corresponding to the multicast service to the first session management network element, so that the first session management
  • the network element establishes a transmission resource (or session) for transmitting the data of multicast services for the terminal as needed according to the instructions of the mobility management network element, such as establishing a unicast QF in the unicast transmission mode, and establishing a multicast in the shared transmission mode.
  • QF avoids unnecessary waste of resources caused by the core network device still trying to establish a multicast transmission channel (such as a multicast session) in a unicast transmission mode.
  • the first terminal is UE
  • the access network equipment is RAN
  • the mobility management network element is AMF
  • the first session management network element is SMF
  • the second session management network element is M-SMF.
  • the unicast user plane network element or user plane function is UPF
  • the multicast user plane function is M-UPF.
  • FIG. 8 provides a method for communicating a multicast service according to an embodiment of the present application. As shown in FIG. 8 , the method may include:
  • S801 The UE sends a join request to the SMF. Accordingly, the SMF receives the join request.
  • the join request (join request), as described above, can be used to request to join the multicast group corresponding to the multicast service.
  • the join request sent by the UE may be carried in a PDU session modification request or a PDU session establishment request.
  • the PDU session modification request is described in the 3GPP standard and is used to request modification of the PDU session of the UE.
  • the PDU session establishment request is as described in the 3GPP standard, and is used to request the establishment of a PDU session of the UE.
  • the PDU session modification request and the PDU session establishment request may carry the identification information of the PDU session of the UE.
  • the join request may include the identification information of the multicast service, and may also include the identification information of the terminal and other information, such as the identification information of the PDU session of the UE.
  • the identification information of the terminal and the identification information of the multicast service are described in the embodiment corresponding to FIG. 7 and will not be repeated.
  • the user when a user using the UE has a multicast service requirement, the user triggers the application layer of the UE to configure the identification information of the multicast service, sends a join request to the AMF, and the AMF forwards the join request to the SMF.
  • the terminal sends the PDU session modification request carrying the join request to the AMF, and the AMF receives the PDU session modification request.
  • the AMF can use the PDU session modification request carried in the PDU session modification request.
  • the identification information of the session is an index, query the context of the PDU session, obtain the identification information of the SMF from the context of the PDU session, identify the PDU session modification request to be sent to the SMF according to the identification information of the SMF, and send/forward the PDU session modification request to the SMF. .
  • the multicast service is a certain TV program, such as: CCTV1, CCTV2 and other TV programs
  • the UE is a set top box (STB) 1
  • STB1 can display the relevant information of these TV programs to the user, and the user can manually select The TV program you want to watch, such as: select CCTV1, and send the selection result to STB1.
  • STB1 sends a PDU session modification request carrying CCTV1 to AMF according to the selection result.
  • AMF receives the PDU session modification request carrying CCTV1 and forwards it to SMF.
  • the sending process of S801 may refer to the existing process, for example: the UE sends a NAS message to the AMF, the NAS message includes an N1 session management container (N1 SM container) (or a transparent container), and the N1 SM container may include A PDU session modification request or a PDU session establishment request that carries a join request; after receiving the NAS message, the AMF forwards the N1 SM container to the SMF.
  • N1 SM container N1 session management container
  • the AMF forwards the N1 SM container to the SMF.
  • the transparent container, the transmission container (transparent container), and the N1 session management container (N1 SM container) can be used instead, without limitation.
  • S802 The SMF sends a join request to the AMF. Accordingly, the AMF receives the join request.
  • the SMF provides the AMF with the information of the multicast group corresponding to the multicast group that the UE requests to join.
  • the join request may be carried in an N11 message and sent to the AMF, and the N11 message may be referred to as an N11 message related to a multicast service.
  • the N11 message related to the multicast service sent by the SMF to the AMF may be described as a multicast N11 (M-N11) message instead.
  • the SMF can also carry other information in the N11 message sent to the AMF, such as the identification information of the unicast PDU session corresponding to the multicast service (that is, the PDU session of the UE), the authorization information of the UE, UE list, etc.
  • the authorization information of the UE may be used for data indicating that the UE is authorized to join the multicast service or to determine that the UE has joined the multicast group corresponding to the multicast service.
  • the UE list can be used to indicate the UEs that join the multicast group corresponding to the multicast service.
  • the UEs indicated by the UE list correspond to the AMF and the SMF.
  • the SMF manages its sessions and the AMF performs registration and mobility management.
  • the UE list It may include the identification information of the UE that joins the multicast group corresponding to the multicast service determined by the SMF.
  • the SMF sends the authorization information of the UE to the AMF, before the SMF sends the join request to the AMF, it can also perform network authentication on the UE, for example, the SMF authorizes the UE's join request (SMF authorizes UE's join request) to determine the UE's join request. Whether it is authorized to join the multicast group corresponding to the multicast service.
  • the SMF can perform network authentication on the UE according to the authentication/subscription information of the UE. If the authentication/subscription information of the UE shows that the UE is subscribed to the multicast service, the network authentication of the UE is successful, and it is determined that the UE has joined the multicast service. If the multicast group corresponding to the broadcast service is selected, a join request is sent to the AMF.
  • the authentication/subscription information of the UE may be stored on the SMF, or stored on other network elements, such as a database of network elements such as UDM, which is not limited.
  • the AMF may perform one or more of the following processes according to the content carried in the N11 message:
  • the N11 message carries the identity information of the UE, but does not carry the authorization information of the UE.
  • the AMF performs network authentication on the UE according to the identity information of the UE, and determines whether the UE can be authorized to join the multicast group corresponding to the multicast service.
  • the process of performing network authentication on the UE by the AMF may refer to the process of performing network authentication on the UE by the SMF, which will not be repeated.
  • the AMF may not perform the above process (1) to avoid repeating network authentication for the same UE.
  • the N11 message carries the identification information of the multicast service.
  • the AMF uses the identification information of the multicast service as an index to find out whether the context information of the multicast session corresponding to the multicast service is stored locally. If the context information of the multicast session corresponding to the multicast service is not stored, the AMF can perform signaling interaction with the M-SMF to obtain the context information of the multicast session corresponding to the multicast service from the M-SMF.
  • the context information of the multicast session corresponding to the multicast service may be replaced by the context information of the multicast service or the context information of the multicast/broadcast service (MBS) or the multicast/broadcast service session context (MBS session context) or multiple Multicast QF information corresponding to the broadcast service, etc.
  • the context information of the multicast session corresponding to the multicast service corresponds to the multicast service.
  • the context information of the multicast session corresponding to the multicast service may include the identification information of the multicast service, and may also include one or more of the following information : the multicast QFI corresponding to the multicast service, the QoS profile of the multicast service, the description information of the multicast service, the UE list, and the status information of the multicast session corresponding to the multicast service, etc.
  • the M-SMF may be an SMF that manages a multicast session corresponding to a multicast service.
  • the M-SMF may store the context information of the multicast session corresponding to the multicast service and so on.
  • the QoS profile of the multicast service may include, but is not limited to, priority information of the multicast service, bit error rate information of the multicast service, packet loss rate information of the multicast service, delay information, and the like.
  • the description information of the multicast service may be used to represent whether the multicast service supports the unicast transmission mode.
  • the description information of the multicast service can be used to indicate whether the multicast service needs to use the unicast transmission mode.
  • the multicast service supporting the unicast transmission mode may refer to the fact that the data of the multicast service can be sent through the unicast transmission mode.
  • the content provider of the multicast service has signed a relevant agreement with the operator, so that the network can use the unicast transmission mode.
  • Unicast resources transmit this multicast data (because using unicast means more network resources are required, and the network will charge more tariffs), and can be billed using a pre-agreed tariff protocol. If the multicast service does not support the unicast transmission mode, it means that the multicast service supports the shared transmission mode.
  • the multicast service supporting the shared transmission mode may mean that the core network can transmit multicast data using the shared transmission mode.
  • the UE list may be used to indicate UEs that have joined the multicast group corresponding to the multicast service.
  • the UE indicated by the UE list corresponds to the AMF and the SMF, the session is managed by the SMF, and the registration and mobility management are performed by the AMF.
  • the UE list corresponds to the multicast service, and the UE list may include the identification information of the multicast service and the identification information of the UEs that have joined the multicast group corresponding to the multicast service.
  • the UE list may also include the identities of the UEs that have not joined the multicast group corresponding to the multicast service. Identification information. If the identification information of a certain UE is included in the UE list, it means that the UE has not joined the multicast group corresponding to the multicast service. If the identification information of the UE is not included in the UE list, it means that the UE has not joined the multicast group corresponding to the multicast service. The multicast group corresponding to the multicast service has been joined.
  • the SMF may send the identification information of the multicast service to the first network element, the first network element receives the identification information of the multicast service, uses the identification information of the multicast service as an index to query the first correspondence, and finds the multicast service.
  • the identification information of the M-SMF corresponds to the identification information of the M-SMF, and the identification information of the M-SMF is sent to the AMF.
  • the AMF receives the identification information of the M-SMF, sends a request message carrying the identification information of the multicast service to the M-SMF according to the identification information of the M-SMF, and needs to receive the context information of the multicast session corresponding to the multicast service.
  • the M-SMF After receiving the request message sent by the AMF, the M-SMF sends the context information of the multicast session corresponding to the multicast service to the AMF.
  • the SMF may also send the identification information of the multicast service to the AMF.
  • the AMF receives the identification information of the multicast service and the identification information of the M-SMF, it can store the corresponding relationship between the identification information of the M-SMF and the identification information of the multicast service, and the corresponding relationship can be used by the AMF in subsequent steps (such as step S819). ) communicates with the M-SMF for the multicast service indicated by the identification information of the multicast service.
  • the first network element may be an NRF or UDM or UDR or PCF, and may also be another network element having the function of selecting M-SMF, which is not limited.
  • the first correspondence may include a correspondence between the identification information of the multicast service and the M-SMF, and the first correspondence may be pre-stored in the first network element.
  • the AMF may store the UE list at the AMF as a part of the UE context, or store the UE list at the AMF as a part of the context of the UE's PDU session.
  • the AMF can determine the context of the PDU session of the UE according to the identification information of the PDU session of the UE in the N11 message, and store the UE list in the N11 message. in the context of the UE's PDU session.
  • the AMF correspondingly stores the identification information of the SMF and the identification information of the multicast service, so that the AMF can determine the SMF corresponding to the multicast service according to the stored information, and perform signaling interaction with the SMF about the multicast service.
  • the identification information of the SMF may be the internet protocol (IP) address of the SMF or the media access control (media access control, MAC) address of the SMF or the fully qualified domain name (FQDN) of the SMF, or It can be other identifiers capable of identifying the SMF, without limitation.
  • IP internet protocol
  • MAC media access control
  • FQDN fully qualified domain name
  • S803 If the AMF obtains the description information of the multicast service from the M-SMF, the AMF can determine whether the multicast service supports the unicast transmission mode according to the description information of the multicast service. If the multicast service supports the unicast transmission mode, the following S804-S813 are performed. On the contrary, if the multicast service does not support the unicast transmission mode, execute the following S814-S820.
  • S803 is an optional step, and the AMF may not execute S803, and execute S804-S820 after executing S802. For example, if the AMF does not obtain the description information of the multicast service from the M-SMF, the AMF may not execute S803.
  • the AMF determines that the transmission mode of the multicast service is the multicast transmission mode or the shared transmission mode.
  • the AMF may determine whether the transmission mode of the multicast service is the unicast transmission mode or the shared transmission mode according to the capability information of the RAN that provides network services for the UE.
  • the capability information of the RAN can be used to represent whether the RAN has the capability of transmitting data of multicast services through multicast transmission (herein, it may be referred to as whether the RAN has the multicast capability or the MBS capability). If the capability information of the RAN indicates that the RAN has the multicast capability, the transmission mode of the multicast service is determined to be the shared transmission mode. On the contrary, if the capability information of the RAN indicates that the RAN does not have the multicast capability, the transmission mode of the multicast service is Unicast transmission mode.
  • the capability information of the RAN may be acquired by the AMF from the RAN when the RAN and/or the AMF are powered on (or in other words, the device is deployed into the network and starts to work).
  • the AMF and the RAN exchange respective configuration information, and the configuration information may include the capability information of the RAN, the capability information of the AMF, the load information of the RAN, and the like.
  • the capability information of the RAN is as described above and will not be repeated.
  • the capability information of the AMF may be used to indicate whether the AMF is supported, and the load information of the RAN may be used to indicate the number of UEs accessing the RAN, and the like.
  • the AMF may acquire the capability information of the RAN through pre-configuration information sent by the network management (such as operations, administration and maintenance (OAM)).
  • the network management can obtain the capability information of the RAN when the RAN accesses the network, and carry the capability information of the RAN in the pre-configuration information to pre-configure the AMF.
  • the AMF can also determine the transmission mode of the multicast service according to other information. For example, in an implementation manner, the AMF may determine to join the multicast service according to the UE list stored in it. The number of UEs in the corresponding multicast group. When the number of UEs exceeds the preset value, the AMF determines that the transmission mode of the multicast service is the shared transmission mode. Otherwise, it determines that the transmission mode of the multicast service is the unicast transmission mode. . Or, in another implementation manner, the AMF obtains the description information of the multicast service.
  • the AMF determines that the multicast service can use the unicast transmission mode; otherwise, the AMF determines that the multicast service can use the unicast transmission mode. It is determined that the transmission mode of the multicast service is the shared transmission mode.
  • the AMF determines the transmission mode of the multicast service, it can correspondingly save the multicast service and the transmission mode of the multicast service, for example, the transmission mode of the multicast service can be saved in the context of the multicast session corresponding to the multicast service. , or the transmission mode of the multicast service is stored in the context of the UE, and the UE belongs to the multicast group corresponding to the multicast service.
  • the AMF sends the information of the multicast service corresponding to the UE to the SMF.
  • the SMF receives the information of the multicast service corresponding to the UE.
  • the information of the multicast service corresponding to the UE may include the transmission mode of the multicast service.
  • the information of the multicast service corresponding to the UE may be carried in an N11 message, and the N11 may be referred to as an M-N11 message or an MB-N11 message.
  • the relevant description of the information of the multicast service corresponding to the UE may include the description in S701, which will not be repeated.
  • the AMF may further acquire the state information of the multicast session corresponding to the multicast service, and carry the state information of the multicast session corresponding to the multicast service in the information of the multicast service corresponding to the UE.
  • the AMF may acquire the state information of the multicast session from the M-SMF, for example, it may acquire the state information of the multicast session from the M-SMF in S802.
  • the RAN or the M-UPF detects that the data of the multicast service has not been transmitted for a long time on the multicast session, it is determined that the multicast session is in a deactivated state, and the state information of the multicast session is indicated to the AMF. .
  • the above-mentioned N11 message carrying the information of the multicast service corresponding to the UE may also carry the authorization information of the UE.
  • the AMF performs the process (2) in S802 and obtains the context information of the multicast session corresponding to the multicast service from the M-SMF the N11 message may also carry the multicast session corresponding to the multicast service. Context information and/or M-SMF identification information, etc.
  • sending the information of the multicast service corresponding to the UE by the AMF to the SMF may include: the AMF sending the information of the multicast service corresponding to the UE to the SMF according to the identification information of the SMF.
  • the identification information of the SMF may be stored locally by the AMF when the AMF executes the process (3) in S802.
  • the SMF obtains the context information of the multicast session corresponding to the multicast service from the M-SMF.
  • the SMF may acquire the context information of the multicast session corresponding to the multicast service from the M-SMF according to the identification information of the M-SMF.
  • the identification information of the M-SMF may be sent by the AMF to the SMF in S805; or, the identification information of the M-SMF may be acquired by the SMF from the first network element, which is not limited.
  • the manner in which the SMF acquires the identification information of the M-SMF from the first network element is the same as the manner in which the AMF acquires the identification information of the M-SMF from the first network element, which will not be repeated.
  • S806 is an optional step. If the AMF sends the context information of the multicast session corresponding to the multicast service to the SMF in S805, then S806 may not be executed.
  • the SMF generates unicast QF information corresponding to the multicast service according to the context information of the multicast session corresponding to the multicast service.
  • the unicast QF information corresponding to the multicast service may be as described in S701, and may include unicast QFI, QoS parameters corresponding to unicast QF, tunnel information corresponding to unicast QF, and the like.
  • the SMF generating the unicast QF information corresponding to the multicast service according to the context information of the multicast session corresponding to the multicast service may include: the SMF multicasting the QoS parameters corresponding to the QF according to the context information of the multicast session corresponding to the multicast service Determine/configure the unicast QF corresponding to the multicast service. For example, set the QoS parameter corresponding to the unicast QF to the same as the QoS parameter corresponding to the multicast QF, and configure the unicast QF and the unicast QF corresponding to the QoS parameter corresponding to the unicast QF.
  • the tunnel information corresponding to the multicast QF determine the tunnel information corresponding to the unicast QF, the mapping relationship between the QFI of the unicast QF with the same QoS parameters and the QFI of the multicast QF, and so on.
  • the SMF determines to establish the M-UPF corresponding to the multicast service and the unicast corresponding to the UE A transport channel between UPFs (or referred to as UPFs or the anchor point of the UE's PDU session).
  • the transmission channel between the M-UPF corresponding to the multicast service and the unicast UPF corresponding to the UE may be used to transmit the data of the multicast service for the UE.
  • the application server such as AF
  • the M-UPF sends the data of the multicast service to the unicast UPF through the transmission channel
  • the unicast UPF sends the data of the multicast service To the RAN, sent by the RAN to the UE.
  • the unicast UPF may be referred to as the user plane network element corresponding to the PDU session of the UE, the unicast UPF and the DN directly connected to the UPF that transmits the data of the UE, or the unicast UPF is the UPF that receives the data of the UE sent by the application server , the unicast UPF can be called the user plane anchor of the UE's PDU session.
  • the M-UPF may be referred to as an ingress network element of the core network that receives data of a multicast service, or an anchor network element of a multicast session corresponding to a multicast service.
  • the transmission channel between the M-UPF and the unicast UPF may be a transmission channel established in a point-to-point manner, for example, according to the tunnel information of the M-UPF (such as the GTP-U tunnel identifier of the M-UPF) and/or the tunnel information of the unicast UPF (such as the GTP-U tunnel identifier of the unicast UPF) to establish the general packet radio service tunneling protocol-user plane (general packet radio service tunnelling protocol -user plane, GTP-U) tunnel.
  • the tunnel information of the M-UPF such as the GTP-U tunnel identifier of the M-UPF
  • the tunnel information of the unicast UPF such as the GTP-U tunnel identifier of the unicast UPF
  • the M-UPF can store the correspondence between the identification information of the multicast service and the tunnel information of the unicast UPF, and the unicast UPF can store the tunnel information of the M-UPF and the multicast service.
  • the corresponding relationship between them such as saving the corresponding relationship between the tunnel information of the M-UPF and the identification information of the multicast service.
  • the tunnel information of the unicast UPF may be the GTP-U tunnel identifier of the unicast UPF or the access network tunnel information (AN tunnel info) of the unicast UPF, etc., which is not limited.
  • the transmission channel between the M-UPF and the unicast UPF may be a transmission channel established in a point-to-multicast point (point-to-multicast point) manner.
  • a multicast tree can be formed between the UPF and its corresponding unicast UPF, the M-UPF is the multicast source, and the unicast UPF corresponding to the M-UPF can be used as the receiver of the multicast tree.
  • the multicast tree corresponds to a multicast address, and the multicast address corresponds to the multicast service.
  • the multicast source can send the data carrying the multicast service and the data packet of the multicast address, and the UPF that receives the data packet can successfully parse it.
  • the data packet obtains the data of the multicast service.
  • the multicast address may be allocated by MB-SMF or M-UPF, and the multicast address may include Common-TEID, C-TEID, or Internet Protocol multicast address (IP multicast address).
  • IP multicast address can be configured by M-SMF or M-UPF, IP multicast address is the Internet Protocol address (IP address) of M-UPF.
  • S809 If the SMF chooses to establish a transmission channel between the M-UPF and the UPF by using the method shown in FIG. 9a, the SMF and the UPF perform signaling interaction to obtain the tunnel information of the UPF.
  • the tunnel information of the UPF can be used for the UPF to transmit the data of the multicast service.
  • the tunnel information of the UPF may be the GTP-U tunnel identifier (tunnel ID) of the UPF or the access network tunnel information (AN tunnel info) of the UPF.
  • the SMF may save its chosen way of establishing the transmission channel between the MB-UPF and the UPF.
  • the SMF sends the first message to the M-SMF. Accordingly, the M-SMF receives the first message.
  • the first message may be used to establish a transmission channel between the MB-UPF and the UPF for transmitting the data of the multicast service.
  • the first message may include one or more of the following information: identification information of the multicast service, QF identification information of the multicast service (such as QFI of the multicast service), and tunnel information of the UPF.
  • the identification information of the multicast service included in the first message can be used by the M-SMF to know which multicast service corresponding to which multicast group the transmission channel is to be established.
  • the QF identification information of the multicast service included in the first message can be used by the M-SMF to know which QF needs to transmit the data of the multicast service to the UPF.
  • the M-SMF and the M-UPF perform signaling interaction, and send the tunnel information of the UPF to the M-UPF, so that after the M-UPF receives the data of the multicast service , and send the data of the multicast service to the UPF according to the tunnel information of the UPF.
  • the SMF does not include the tunnel information of the UPF, it means that the SMF does not choose to use the method shown in Figure 9a to establish the transmission channel, but chooses the method shown in Figure 9b to establish the transmission channel.
  • the address does not need to be allocated by the M-UPF, but is allocated by the M-SMF, then the M-SMF does not perform signaling interaction with the M-UPF. If the M-UPF assigns a multicast address, the M-SMF and the M-UPF perform signaling interaction, the M-SMF sends an N4 message to the M-UPF requesting to obtain the multicast address, and the M-UPF receives the N4 message sent by the M-SMF. After the message, send the multicast address to M-SMF.
  • S812 The M-SMF sends a response message of the first message to the SMF.
  • the SMF receives the response message of the first message.
  • the response message corresponding to the first message may indicate that the transmission channel between the M-UPF and the UPF is successfully established. If the transmission channel is established in the manner shown in FIG. 9b, the response message corresponding to the first message may carry the multicast address.
  • the SMF sends the first information to the AMF according to the information of the multicast service corresponding to the UE.
  • the AMF receives the first information.
  • the relevant description of the first information and the process of sending the first information to the AMF by the SMF according to the information of the multicast service corresponding to the UE may refer to the description in S702, which will not be repeated.
  • the AMF may save the first information after receiving the first information.
  • the first information is stored locally in correspondence with the identification information of the multicast service.
  • the AMF sends the first information to the RAN.
  • the RAN receives the first information.
  • the first information may be carried in the N2 message.
  • S814-S815 may be executed after S807 and before S808, or may be executed in S808-S813, etc., without limitation.
  • S816 If the transmission mode of the multicast service is the shared transmission mode, the AMF determines whether a multicast session corresponding to the multicast service is established. If not established, execute S817-S820.
  • the multicast session corresponding to the multicast service may include a transmission channel between the RAN and the M-UPF.
  • the AMF sends an N2 message to the RAN, where the N2 message may include the context of the multicast session corresponding to the multicast service, such as the information of the multicast QF corresponding to the multicast service.
  • the RAN receives the N2 message.
  • the RAN sends a response to the N2 message to the AMF, where the response to the N2 message may include tunnel information of the RAN.
  • the AMF receives the response of the N2 message.
  • the tunnel information of the RAN may include an internet protocol (internet protocol, IP) address of the RAN and a tunnel endpoint identifier (tunnel endpoint identifier, TEID).
  • IP internet protocol
  • TEID tunnel endpoint identifier
  • the AMF sends the tunnel information of the RAN to the M-SMF.
  • the M-SMF carries the tunnel information of the RAN in an N4 session configuration message (N4 session configuration) and sends it to the M-UPF.
  • AMF triggers a core network device (such as SMF) to establish a transmission resource (or session) for transmitting multicast service data for the UE, for example, in a unicast transmission mode.
  • a core network device such as SMF
  • Unicast QF Multicast QF is established in the shared transmission mode, so that the transmission resources for transmitting the data of the multicast service can be established on demand, avoiding the problems caused by the core network equipment still trying to establish a multicast transmission channel in the unicast transmission mode. Unnecessary waste of resources.
  • the SMF may determine the content included in the first information sent to the AMF according to the instruction of the AMF, thereby saving network resources.
  • FIG. 8 describes the method shown in FIG. 7 by taking the information of the multicast service corresponding to the UE including the transmission mode, or including the transmission mode and the state information of the multicast session as an example.
  • the first terminal is UE
  • the access network equipment is RAN
  • the mobility management network element is AMF
  • the first session management network element is SMF
  • the second session management network element is M-SMF.
  • the user plane function is UPF
  • the multicast user plane function is M-UPF.
  • the method shown in FIG. 7 is described by taking the information of the multicast service corresponding to the UE including the state information of the multicast session as an example.
  • FIG. 10 is another method for communicating a multicast service provided by an embodiment of the present application. As shown in FIG. 10 , the method may include:
  • S1000 The AMF determines that the multicast session corresponding to the multicast service is in a deactivated state.
  • the AMF can obtain the state information of the multicast session from the M-SMF. In another possible design, if the RAN or the M-UPF detects that the data of the multicast service has not been transmitted for a long time on the multicast session, it is determined that the multicast session is in a deactivated state, and the AMF can obtain the multicast data from the RAN or the M-UPF. status information of the broadcast session.
  • the UE sends a join request to the SMF. Accordingly, the SMF receives the join request.
  • S1001 is the same as S801, and will not be repeated.
  • the SMF sends a join request to the AMF. Accordingly, the AMF receives the join request.
  • S1002 is the same as S802, and will not be repeated.
  • the AMF sends the information of the multicast service corresponding to the UE to the SMF, and the information of the multicast service corresponding to the UE includes state information, and the state information indicates that the multicast session corresponding to the multicast service is in a deactivated state.
  • the SMF receives the information of the multicast service corresponding to the UE.
  • the AMF may also send UE authorization information to the SMF. If the AMF also obtains the context information of the multicast session corresponding to the multicast service from the M-SMF in S1002, the AMF may also send the context information of the multicast session corresponding to the multicast service and/or the M-SMF to the SMF. SMF identification information, etc.
  • the SMF obtains the context information of the multicast service from the M-SMF.
  • the SMF generates unicast QF information corresponding to the multicast service according to the context information of the multicast service.
  • the SMF determines that the multicast session corresponding to the multicast service is in a deactivated state, and triggers the SMF to send the first information to the AMF.
  • the first information includes multicast QF information corresponding to the multicast service and unicast QF information corresponding to the multicast service.
  • the SMF learns that the multicast session corresponding to the multicast service is in the deactivated state and determines that the multicast session corresponding to the multicast service cannot currently be used to transmit data of the multicast service for the UE, because the SMF cannot determine when the multicast service is When the multicast session is activated again, whether the RAN corresponding to the UE has the multicast capability, in other words, the SMF cannot determine the transmission mode of the multicast service according to the capability information of the RAN.
  • the SMF can send the multicast QF information corresponding to the multicast service and the unicast QF information corresponding to the multicast service to the AMF at the same time, so that the AMF needs to activate the corresponding multicast service later
  • the UE receives If the incoming RAN does not support multicast, the AMF chooses to transmit the data of the multicast service through the PDU session of the UE, otherwise, the data of the multicast service is transmitted through the multicast session.
  • the PDU session of the UE may be used to transmit the data of the multicast service for the UE.
  • the PDU session of the UE may be referred to as a unicast PDU session corresponding to a multicast service, a unicast session corresponding to a multicast service, or a unicast QF or a unicast transmission channel corresponding to the multicast service, and so on.
  • the AMF stores the first information.
  • the AMF may store the multicast QF information corresponding to the multicast service and the unicast QF information corresponding to the multicast service.
  • the SMF may also determine to establish the M- service corresponding to the multicast service.
  • a transmission channel between the M-UPF and the UPF may be established by using the method shown in FIG. 9 a or FIG. 9 b . Specifically, for the establishment process, reference may be made to S809-S813, which will not be repeated.
  • the SMF can also determine not to establish a transmission channel for transmitting the data of the multicast service through the PDU session of the UE according to the state information that the multicast session is in the deactivated state, so as to ensure compatibility with the current design process and simplify the design.
  • the SMF can determine, according to the status of the multicast session provided by the AMF, that it can subsequently estimate that the multicast data corresponding to the multicast service can be transmitted through the UE's PDU session (ie, through the unicast transmission mode).
  • a transmission channel for transmitting the data of the multicast service through the PDU session of the UE is established in advance, so as to avoid establishment delay and improve the efficiency of the subsequent UE receiving the data of the multicast service through the PDU session. Or do not establish a unicast transmission channel to ensure the compatibility of the system.
  • Figures 7 to 10 above show the processing flow of the multicast service when the terminal joins the multicast group corresponding to the multicast service.
  • the embodiment of the present application also provides the processing flow of the multicast service when the terminal leaves the multicast group corresponding to the multicast service. Specifically, refer to the methods shown in FIGS. 11-13 .
  • terminal in the methods shown in the following Figures 11-12 and the terminals in the methods shown in the above-mentioned Figures 7-10 may be the same terminal or different terminals, which are not limited.
  • FIG. 11 is a method for communicating a multicast service provided by an embodiment of the application. As shown in FIG. 11 , the method may include:
  • the first session management network element receives the second information.
  • the first session management network element may be the SMF in FIG. 5 .
  • the second information may be used to indicate that the first terminal leaves (is about to leave or requests to leave) the multicast group corresponding to the multicast service.
  • the second information may include a leave indication and identification information of a multicast service, and the leave indication may be used to instruct a terminal to leave (request to leave) a multicast group corresponding to a certain multicast service.
  • the second information may also include other information such as identification information of the first terminal, which is not limited.
  • the related description of the identification information of the first terminal and the identification information of the multicast service may refer to the description in the embodiment corresponding to FIG. 7 , which will not be repeated.
  • the first session management network element receives the second information from the first terminal through the mobility management network element.
  • the second information is generated and sent by the first terminal.
  • the second information of the first terminal received by the first session management network element through the mobility management network element can be understood as: the first terminal sends the second information to the mobility management network element, and the mobility management network element does not receive the second information after receiving the second information. Perform any processing, and forward the second information to the first session management network element.
  • Mode 1 or Mode 2 is described below:
  • the second information can be carried in a transparent container (or called a NAS SM container), the receiver of the transparent container is the first session management network element, and only the receiver can parse the transparent container The content of the transparent container will not be recognized and processed by the non-receiver.
  • a transparent container or called a NAS SM container
  • the receiver of the transparent container is the first session management network element, and only the receiver can parse the transparent container
  • the content of the transparent container will not be recognized and processed by the non-receiver.
  • Manner 1 The first terminal sends the second information to the mobility management network element, and the mobility management network element forwards the second information to the first session management network element after receiving the second information.
  • the first terminal may send the identification information carrying the multicast service, the leaving instruction, and the leaving request of the second information to the mobility management network element.
  • the leave request may also carry identification information of the first terminal.
  • the mobility management network element determines that the first terminal requests to leave the multicast group corresponding to the multicast service, and triggers the mobility management network element to send the second information to the first session management network element.
  • the first terminal may send a leave request to the mobility management network element (leave request) ⁇ identification information of the multicast service, leave indication, NAS SM ⁇ multiple service
  • the mobility management network element sends the N11 message ⁇ NAS SM ⁇ the identification information of the multicast service, the leaving instruction> to the first session management network element.
  • the first session management network element receives the second information of the first terminal through the mobility management network element. Further, after the first session management network element determines according to the second information that the first terminal leaves the multicast group corresponding to the multicast service, the first session management network element sends a leaving indication and identification information of the multicast service to the mobility management network element. , and notify the mobility management network element that the first terminal leaves the multicast group corresponding to the multicast service.
  • the first terminal may send a leave request to the mobility management network element (leave request) ⁇ NAS SM ⁇ identification information of the multicast service, leave indication>>
  • the mobility management network element forwards the leave request (leave request) ⁇ NAS SM ⁇ multicast service identification information, leave instruction> to the first session management network element.
  • the first session management network element sends an N11 message ⁇ identification information of the multicast service, leaving indication> to the mobility management network element.
  • the N11 message may also include other information such as identification information of the first terminal, which is not limited.
  • the first session management network element may receive the second information from the mobility management network element.
  • the second information is generated and sent by the mobility management network element.
  • the third or fourth method is described below:
  • the first terminal may send a leave request carrying the identification information of the multicast service and the leave instruction to the mobility management network element, and the mobility management network element determines that the first terminal requests to leave the multicast group corresponding to the multicast service after receiving the leave request. group, triggering the mobility management network element to send the second information to the first session management network element.
  • the first terminal may send a leave request to the mobility management network element (leave request) ⁇ identification information of the multicast service, leave indication, NAS SM ⁇ > >, after the mobility management network element receives the leave request, it determines that the first terminal leaves the multicast group corresponding to the multicast service, and sends the N11 message ⁇ NAS SM ⁇ the identification information of the multicast service, the leave message to the first session management network element Indicate >, that is, send the second information.
  • the N11 message may also include other information such as identification information of the first terminal, which is not limited.
  • the first terminal sends a message carrying the MBS container to the first session management network element through the mobility management network element, and the MBS container may carry the leaving indication and the identification information of the multicast service.
  • the first session management network element forwards the MBS container in the received message to the mobility management network element, and the mobility management network element receives and parses the MBS container, determines that the first terminal leaves the multicast group corresponding to the multicast service, and sends the message to the first session.
  • the management network element sends the second information.
  • the receiver of the MBS container is a mobility management network element, and only the mobility management network element can parse the content of the transparent container, and the non-receiver will not recognize and process the content in the MBS container.
  • the first terminal may send a message ⁇ MBS container ⁇ identification information of the multicast service, leaving indication>> to the mobility management network element, and the mobility management network After receiving the MBS container ⁇ the identification information of the multicast service and the leaving instruction>, the element determines that the first terminal leaves the multicast group corresponding to the multicast service, and sends an N11 message ⁇ the identification information of the multicast service to the first session management network element , leave instructions >.
  • the mobility management network element can find the first session management network element in the following manner, and send relevant information to the first session management network element: when the PDU session is established, the mobility management network element Element stores the corresponding relationship between the identification information of the PDU session and the identification information of the session management network element. After that, if the terminal carries the terminal's departure request through the signaling of the PDU session in Modes 1 to 4, the mobility management network element can pass the previous The stored correspondence is found in the session management network element.
  • the mobility management network element stores the correspondence between the identification information of the multicast service and the identification information of the session management network element, so that when the terminal leaves the multicast group corresponding to the multicast service When the group is formed, the mobility management network element will find the corresponding session management network element according to the stored correspondence.
  • the first session management network element may also receive indication information used to indicate the state of the multicast session corresponding to the multicast service (for example, whether it is in a deactivated state).
  • indication information used to indicate the state of the multicast session corresponding to the multicast service (for example, whether it is in a deactivated state).
  • the mobility management network element determines the state of the multicast session corresponding to the multicast service, and sends the indication information indicating the state of the multicast session corresponding to the multicast service (for example, whether it is in a deactivated state) to the first A session management network element.
  • the first session management network element deletes the unicast QF information corresponding to the multicast service according to the second information.
  • the unicast QF information corresponding to the multicast service deleted in S1102 may be unicast QF information related to the first terminal, and the unicast QF information is used to transmit the data of the multicast service for the first terminal through the unicast transmission mode .
  • the unicast QF information corresponding to the multicast service may be generated by the first session management network element when the first terminal joins the multicast group corresponding to the multicast service, and stored on the first session management network element. Specifically, for the process of generating the unicast QF information corresponding to the multicast service by the first session management network element, reference may be made to the description in S807 in the method shown in FIG. 8 above, which will not be repeated.
  • the first session management network element may determine, according to the second information, that after the first terminal leaves the multicast group corresponding to the multicast service, and then use the identification information of the first terminal as an index to find the context of the PDU session of the UE.
  • the UE's PDU session context includes unicast QF information.
  • the SMF finds the unicast QF information corresponding to the multicast service from the context of the UE's PDU session, and converts the multicast service The corresponding unicast QF information is removed from the context of the UE's PDU session.
  • the first session management network element may store the association between the unicast QF information and the multicast QF information corresponding to the multicast service after generating the unicast QF information corresponding to the multicast service according to the context of the multicast session corresponding to the multicast service. relation.
  • the first session management network element may also perform one or more of the following processes: a) the first session management network element releases the unicast QF associated with the multicast. b) The first session management network element deletes other locally stored information (eg, multicast authorization information of the UE, etc.). c) The first session management network element can also decide whether to release the multicast session information according to whether other terminals need to continue to receive the multicast service data of the multicast group. For example, the first session management network element determines the first session management network element. When the terminal is the last terminal to leave the multicast session, the first session management network element releases the multicast session.
  • the first session management network element determines the first session management network element. When the terminal is the last terminal to leave the multicast session, the first session management network element releases the multicast session.
  • S1102 is an optional step.
  • multiple multicast services can correspond to the same unicast QF
  • data of two or more multicast services can be transmitted on one unicast QF
  • S1102 is not executed, and the first session management network element is not triggered to delete the unicast QF information corresponding to the multicast service.
  • a multicast service corresponds to a unicast QF, that is, when only one type of multicast service data can be used on a unicast QF
  • execute S1102 to delete the multicast service.
  • unicast QF information corresponding to the broadcast service.
  • the first session management network element sends third information to the mobility management network element according to the second information.
  • the mobility management network element receives the third information.
  • the third information may be used to delete the unicast QF information corresponding to the multicast service.
  • the third information may carry the identification information of the multicast service and the deletion indication, and may also carry the identification information of the first terminal or the identification information of the PDU session of the first terminal, etc.
  • the deletion indication may be used to indicate deletion of a certain unicast QF information.
  • the third information may also be used to instruct to modify the PDU session of the first terminal, where the PDU session of the first terminal includes unicast QF, and the PDU session of the first terminal is used to transmit data of a multicast service.
  • the first session management network element determines that the multicast session corresponding to the multicast service is in an active state
  • the first session management network element determines according to the second information that the first terminal leaves the multicast group corresponding to the multicast service, and may no longer
  • the PDU session of the first terminal is used to transmit the data of the multicast service, and the modification of the PDU session of the first terminal is instructed.
  • the first session management network element determines that the multicast session corresponding to the multicast service is in a deactivated state, it is determined that the multicast session corresponding to the multicast service cannot be used to transmit the data of the multicast service for the first terminal, and it is also not determined that the multicast session corresponds to the multicast service.
  • the session is activated again, whether the access network device still has the multicast function. In this case, after the first session management network element receives the second information, even if it is determined according to the second information that the first terminal leaves the multicast group corresponding to the multicast service, the first session management network element will not instruct the first terminal to modify PDU session.
  • the first session management network element may determine that the terminal leaves the multicast group corresponding to the multicast service according to the second information.
  • the network element sends the unicast QF information corresponding to the multicast service, and determines whether it is necessary to send the third information to the mobility management network element. If the first session management network element sends the unicast QF information corresponding to the multicast service to the mobility management network element, the third information is sent to the mobility management network element; otherwise, if the first session management network element does not send the unicast QF information to the mobility management network element For the unicast QF information corresponding to the multicast service, the third information is not sent to the mobility management network element.
  • the mobility management network element deletes the unicast QF information corresponding to the multicast service according to the third information.
  • the third information carries the identification information of the multicast service and the identification information of the first terminal. If, as described in S702, the mobility management network element stores the correspondence between the unicast QF information corresponding to the multicast service and the identification information of the first terminal, the mobility management network element may, according to the identification information of the first terminal and the identification information of the first terminal The corresponding relationship is to delete the unicast QF information corresponding to the identification information of the first terminal.
  • the mobility management network element may use the identifier of the first terminal The information is an index, the UE context of the first terminal is found, and the unicast QF corresponding to the multicast service is deleted from the UE context of the first terminal.
  • the unicast QF information corresponding to the multicast service is stored in the context of the multicast session corresponding to the multicast service, and the mobility management network element can use the identification information of the multicast service as an index to find the multicast service. In the context of the multicast session corresponding to the service, the unicast QF corresponding to the multicast service is deleted from the context of the multicast session corresponding to the multicast service.
  • the method may further include: the mobility management network element sends an N2 message to the RAN, instructing the RAN to modify the PDU session of the first terminal, such as mobile
  • the management network element may send an N2 message carrying the identification information of the first terminal and a modification instruction to the RAN, and the modification instruction may be used to instruct to modify a PDU session of a certain UE to improve resource utilization.
  • modifying the PDU session of the first terminal may include one or more of the following: deleting the unicast QF information corresponding to the multicast service in the access network device, releasing the access network device configured for the first terminal for transmission The air interface radio bearer resources of the data of the multicast service, etc.
  • the multicast transmission mode is the unicast transmission mode, and the transmission channel for transmitting the data of the multicast service between the UPF and the M-UPF is not released (that is, it still exists), then the UPF and the M-UPF can also be deleted.
  • the information related to the multicast service in the core network equipment can be deleted, and the mobility management network element can be triggered to delete the multicast service.
  • the first terminal is UE
  • the access network equipment is RAN
  • the mobility management network element is AMF
  • the first session management network element is SMF
  • the second session management network element is M-SMF.
  • the user plane function is UPF
  • the multicast user plane function is M-UPF.
  • FIG. 13 is a method for communicating a multicast service provided by an embodiment of the present application. As shown in FIG. 13 , the method may include:
  • the UE sends a transparent container carrying a leave request to the SMF, such as an MBS container carrying the leave request.
  • the UE may determine to leave the multicast group 1 according to user requirements. For example, the user can view each multicast group in the multicast group list through the user interface or other methods, select the multicast group 1 that he wants to leave from the multicast group list, and send the selection result to the UE , the UE receives the user's selection result, and determines to leave the multicast group 1 according to the selection result.
  • multicast group 1 is a multicast group corresponding to a TV program
  • the multicast group list includes related information of multiple TV programs, such as: CCTV1, CCTV2, etc.
  • the UE is an STB, when CCTV1 is being watched If the user leaves CCTV1, for example: when the user switches from CCTV1 to CCTV2, the user can manually select the CCTV2 he wants to watch, and send the selection result to the STB, and the STB can determine to leave the multicast group 1 corresponding to CCTV1 according to the selection result. .
  • the leave request may include the identification information of the UE, the leaving instruction and the identification information of the multicast service.
  • the MBS container carrying the leave request corresponds to the AMF, and the content carried by the MBS container can only be parsed/identified by the AMF.
  • the SMF After receiving the MBS container carrying the leave request from the UE, the SMF sends an N11 message carrying the MBS container to the AMF (it may also be an MB-N11 message), and then forwards the MBS container carrying the leave request to the AMF, which carries the MBS at this time.
  • the N11 message of the container can be used to notify the AMF that the UE leaves the multicast group corresponding to the multicast service.
  • the AMF receives the N11 message.
  • the AMF sends the second information to the SMF. Accordingly, the SMF receives the second information.
  • the AMF can also send the state information of the multicast session corresponding to the multicast service to the SMF.
  • the process of determining the state information of the multicast session corresponding to the multicast service by the AMF may refer to the description in S1001, which will not be repeated.
  • the SMF deletes the unicast QF information corresponding to the multicast service according to the second information.
  • S1304 is the same as S1202, and will not be repeated.
  • the SMF sends the third information to the AMF.
  • the AMF receives the third information.
  • S1306 The AMF deletes the unicast QF information corresponding to the multicast service according to the third information.
  • the embodiment of the present application does not limit the AMF to delete the unicast QF information corresponding to the multicast service after receiving the third information.
  • the AMF when the AMF receives the N11 message and determines that the UE leaves the multicast group corresponding to the multicast service, it deletes the unicast QF information corresponding to the multicast service.
  • the method described in FIG. 13 may further include:
  • the AMF sends an N2 message to the RAN, and the N2 message can instruct the RAN to modify the PDU session of the first terminal.
  • the mobility management network element can send an N2 message carrying the identification information of the first terminal and the modification instruction to the RAN.
  • the modification instruction can use It is used to instruct to modify the PDU session of a certain UE.
  • the RAN receives the N2 message.
  • the RAN deletes the unicast QF information corresponding to the multicast service in the access network device and/or releases the air interface configured by the access network device for the first terminal for transmitting the data of the multicast service.
  • S1307 is an optional step, and if the third information does not indicate to modify the PDU session of the UE, then S1307 is not performed.
  • the SMF can trigger the release of the MB-UPF to UPF transmission channel.
  • the process of releasing the transmission channel from MB-UPF to UPF may include:
  • the SMF sends a notification message to the M-SMF in step S1308 to notify the release of the transmission channel between the M-UPF and the UPF.
  • the notification message may include the UPF's GTP-U tunnel and Identification information of the multicast service.
  • the M-SMF configures the M-UPF to release/delete the corresponding relationship between the GTP-U tunnel of the UPF and the identification information of the multicast service stored in the M-UPF, and releases/deletes the corresponding relationship between the M-UPF and the multicast service identification information. If the deletion is successful, the SMF is replied, and the SMF is triggered to further configure the corresponding relationship between the identification information of the multicast service stored in the UPF and the GTP-U tunnel of the M-UPF.
  • the SMF sends a notification message to the UPF to notify the release of the transmission channel used for transmitting the multicast service between the UFP and the M-UPF.
  • the notification message may include the identification information of the multicast service and
  • the release indication is used to indicate the release of the transmission channel between the UPF and the M-UPF for transmitting the multicast service.
  • the UPF receives the notification message and triggers the UPF to send the instruction information indicating leaving the multicast tree corresponding to the multicast service to the M-UPF.
  • the SMF can determine to release the transmission resources related to the UE according to the leaving instruction provided by the AMF, or the leaving instruction and the status information of the multicast session, so as to improve the resource utilization rate.
  • Figures 7 to 10 above describe the processing flow of the multicast service by taking the terminal joining the multicast group corresponding to the multicast service as an example, and the above Figures 11 to 13 take the terminal leaving the multicast group corresponding to the multicast service as an example Describes the processing flow of the multicast service.
  • this embodiment of the present application provides a processing flow for activating a transmission channel (such as a multicast session or a transmission resource) corresponding to a multicast service.
  • a transmission channel such as a multicast session or a transmission resource
  • the processing flow for activating the multicast session corresponding to the multicast service may include: when the core network device (such as the M-SMF) determines that the transmission channel (such as the multicast session) corresponding to the multicast service needs to be activated, the M-SMF - The SMF sends the fourth information that triggers the multicast session corresponding to the activated multicast service to the mobility management network element. After receiving the fourth information, the mobility management network element determines the transmission channel corresponding to the activated multicast service, which is determined by the mobility management network element The access network device it manages is used to process the data transmitted on the transmission channel corresponding to the multicast service (such as the data of the multicast service).
  • the core network device such as the M-SMF
  • the mobility management network element sends fifth information to the access network device, where the fifth information may include QF information used to transmit data of the multicast service for the first terminal.
  • the process of activating the transmission channel corresponding to the multicast service provided by the embodiment of the present application can be completed through the signaling interaction between the M-SMF and the mobility management network element, and the signaling interaction between the mobility management network element and the access network equipment, which is consistent with the existing
  • the activation process needs to be completed through the signaling interaction between M-SMF and SMF, the signaling interaction between SMF and AMF, and the signaling interaction between SMF and RAN, which can save signaling interaction delay and improve activation efficiency.
  • the first terminal is UE
  • the access network equipment is RAN
  • the mobility management network element is AMF
  • the first session management network element is SMF
  • the second session management network element is M-SMF.
  • the user plane function is UPF
  • the multicast user plane function is M-UPF
  • the transmission channel corresponding to the multicast service is the multicast session corresponding to the multicast service as an example, the activation method is introduced:
  • FIG. 14 is a method for communicating a multicast service provided by an embodiment of the present application.
  • a multicast session corresponding to the multicast service is in a deactivated state.
  • the AMF may store multicast QF information corresponding to the multicast service and unicast QF information corresponding to the multicast service, and the unicast QF information corresponding to the multicast service corresponds to the UE.
  • the multicast QF information corresponding to the multicast service and the unicast QF information corresponding to the multicast service may be carried by the SMF in the first information and sent to the AMF as described in the embodiment corresponding to FIG. 7 , and stored locally by the AMF.
  • the method may include:
  • S1401 The AF sends the data of the multicast service to the M-UPF.
  • the M-UPF receives the data of the multicast service.
  • the M-UPF After receiving the data of the multicast service, the M-UPF determines that the data of the multicast service needs to be delivered to the UE, and notifies the M-SMF to activate the multicast session corresponding to the multicast service. For example, the M-UPF can send a notification message to the M-SMF, and the notification message can include the identification information of the multicast service. After receiving the notification message, the M-SMF can determine the multicast service corresponding to the activated multicast service according to the identification information of the multicast service. broadcast session. Or, the notification message includes the identification information of the multicast service and an activation indication (such as active indicator). After receiving the notification message, the M-SMF can learn that a certain session is to be activated according to the activation indication, and then according to the identification information of the multicast service Determine to activate the multicast session corresponding to the multicast service.
  • the M-UPF After receiving the notification message, the M-SMF can learn that a certain session is to be activated according to the activation
  • the identification information of the multicast service can be described in the embodiment corresponding to FIG. 7, such as the MBS session ID, or other identification information, such as the packet forwarding control protocol (PFCP) session ID, M -SMF can obtain MBS session ID based on PFCP session ID.
  • PFCP packet forwarding control protocol
  • the M-SMF sends fourth information to the AMF.
  • the AMF receives the fourth information.
  • the fourth information may be used to trigger activation of the transmission channel corresponding to the multicast service, such as triggering activation of the transmission channel between the RAN and the UPF, the UPF and the M-UPF for transmitting the data of the multicast service, or deactivating the RAN and the UPF and the M-UPF.
  • the fourth information may carry the identification information of the multicast service, such as the MBS session ID, and may also carry an activation indication, and the activation indication may be used to instruct to activate a transmission channel managed/established by the M-SMF.
  • the fourth information may be carried in the N11 message.
  • the identification information of the multicast service carried in the fourth information may also be the MBS Context information corresponding to the MBS Session ID.
  • the MBS Context information may be the identification information of the MBS Context, or may be the QOS information of the MBS, such as priority information, packet loss rate information, delay information, and so on.
  • the transmission channel corresponding to the multicast service may be an N3 channel used for transmitting data of the multicast service, or an MB-N3 channel used for transmitting the data of the multicast service, or may also refer to the multicast service
  • the corresponding transmission resources on the transmission channel are not limited.
  • the transmission channel corresponding to the multicast service may be managed by the M-SMF.
  • the M-SMF used to manage the transmission channel corresponding to the multicast service may refer to the second session management network element managing the parameters corresponding to the transmission channel, such as generating QoS template information of the multicast session, and for example, generating the endpoint address information of the transmission channel, For example IP address etc.
  • sending the fourth information by the M-SMF to the AMF may include: the fourth information includes identification information of the multicast service, and the M-SMF finds the identification information of the AMF corresponding to the multicast service according to the identification information of the multicast service, and according to The identification information of the AMF sends the fourth information to the AMF.
  • the M-SMF can find the identification information of the AMF corresponding to the multicast service according to the identification information of the multicast service and the correspondence between the identification information of the multicast service and the identification information of the AMF.
  • the M-SMF may store the correspondence between the identification information of the multicast service and the identification information of the AMF. For example, when the UE requests the M-SMF to establish a multicast session corresponding to the multicast service through the AMF, the AMF finds the M-SMF that establishes the multicast session for the UE, and requests the M-SMF to establish the multicast session for the UE. , the M-SMF establishes a multicast session for the UE after receiving the request, and can store the corresponding relationship between the identification information of the multicast service and the identification information of the AMF.
  • the AMF locally stores the identification information of the multicast service that needs to be activated.
  • the AMF may store the identification information and activation indication of the multicast service correspondingly.
  • S1405 The AMF paging the UEs in the multicast group corresponding to the multicast service.
  • the method of the AMF paging the UEs in the multicast group may refer to the prior art, for example, the SMF indicates the UE that needs to be paged to the AMF, and the AMF pages the UE according to the SMF instruction.
  • the AMF may refer to the method shown in FIG. 16 below to page the terminals in the multicast group.
  • S1406 The UE receives the paging message sent by the AMF, and sends a paging response to the AMF, such as sending a service request (service request) to the AMF.
  • a service request service request
  • the service request may be used to indicate that the UE needs to receive a multicast service.
  • the service request may carry the identification information of the multicast service, and may also carry other information, such as the identification information of the UE.
  • the UE may send a service request to the AMF through the RAN.
  • the UE belonging to the AMF management in the multicast group corresponding to the multicast service is in the connected state (or called the RRC connected state or the CM connected state (CM_connected state)), and can receive the data of the multicast service.
  • the connected state or called the RRC connected state or the CM connected state (CM_connected state)
  • S1407 The AMF acquires the transmission mode of the multicast service according to the fourth information. If the transmission mode of the multicast service is the shared transmission mode, execute the following S1408-S1411. If the transmission mode of the multicast service is the individual transmission mode, the following S1412-S1414 are performed.
  • the AMF determines the transmission mode of the multicast service according to the capability information of the RAN.
  • the manner in which the AMF determines the transmission mode of the multicast service according to the capability information of the RAN may refer to the description in the embodiment corresponding to FIG. 8 , which will not be repeated.
  • the fourth information may carry the identification information of the multicast service, and the AMF obtains the transmission of the multicast service according to the identification information of the multicast service and the corresponding relationship between the multicast service and the transmission mode of the multicast service. model.
  • the correspondence between the multicast service and the transmission mode of the multicast service is stored on the AMF.
  • the transmission mode of the multicast service is stored in the context of the UE, and the AMF finds the context of the UE in the multicast group corresponding to the multicast service, and obtains the transmission mode of the multicast service from the context of the UE.
  • the AMF sends fifth information to the RAN.
  • the RAN receives the fifth information.
  • the fifth information may include multicast QF information corresponding to the multicast service and unicast QF information corresponding to the multicast service, and may also include other information, such as UE identification information.
  • the fifth information may be carried in the N2 message.
  • the AMF can use the service request itself or the stored identification information of the multicast service and the association between the UE to know that the UE needs to receive the multicast service, and determine that the UE needs to be activated according to the storage in S1404.
  • the AMF uses the identification information of the multicast service as an index to search for the unicast QF information corresponding to the multicast service corresponding to the UE, and compares the multicast QF information corresponding to the multicast service and the multicast QF information corresponding to the multicast service.
  • the unicast QF information corresponding to the broadcast service is carried in the fifth information and sent to the RAN.
  • the RAN sends the tunnel information of the RAN to the AMF.
  • the AMF receives the tunnel information of the RAN.
  • the tunnel information of the RAN can be used to establish a transmission channel between the RAN and the M-UPF for transmitting the data of the multicast service.
  • the tunnel information of the RAN may be referred to as shared tunnel information or multicast tunnel information of the RAN.
  • the AMF sends the tunnel information of the RAN to the M-SMF.
  • the AMF receives the tunnel information of the RAN.
  • the M-SMF sends the tunnel information of the RAN to the M-UPF.
  • the M-UPF receives the tunnel information of the RAN.
  • the M-SMF may also send the identification information of the multicast service to the M-UPF to indicate that the tunnel information sent to the RAN of the M-UPF is used to establish a transmission channel corresponding to the multicast service.
  • S1412 The AMF acquires unicast QF information corresponding to the multicast service.
  • the AMF learns that the UE needs to receive a multicast service, and determines that the multicast session corresponding to the multicast service needs to be activated according to the storage in S1404, and the AMF uses the identification information of the multicast service as an index. , and search for the unicast QF information corresponding to the multicast service corresponding to the UE.
  • the AMF sends fifth information to the RAN.
  • the RAN receives the fifth information.
  • the fifth information may include unicast QF information corresponding to the multicast service, and may also include other information, such as UE identification information.
  • the fifth information may be carried in the N2 message.
  • the RAN sends the tunnel information of the RAN to the SMF, and triggers the SMF to establish a transmission channel between the RAN and the UPF and between the UPF and the M-UPF for transmitting the data of the multicast service.
  • the process of establishing a transmission channel between the RAN and the UPF and between the UPF and the M-UPF for transmitting the data of the multicast service can be referred to as described in S804-S813 in FIG. 8 , and will not be repeated.
  • the core network device triggers the sending of the QF information used to transmit the data of the multicast service for the UE to the RAN corresponding to the UE, reducing the number of The number of signaling interactions between network elements when a session is activated, improving the session activation efficiency.
  • FIG. 14 provides the processing flow of activating the transmission channel corresponding to the multicast service.
  • the present application also provides a processing flow for deactivating the transmission channel corresponding to the multicast service.
  • the processing flow of deactivating the transmission channel corresponding to the multicast service may include: when the core network device (such as M-SMF) determines that the transmission channel corresponding to the multicast service needs to be deactivated (such as a multicast session or multicast transmission resources), the M-SMF sends to the mobility management network element the sixth information that triggers the deactivation of the transmission channel corresponding to the multicast service. After the mobility management network element receives the sixth information, it determines the transmission channel corresponding to the deactivated multicast service. , which means that the UEs in the multicast group corresponding to the multicast service may leave and do not need to receive the data of the multicast service.
  • the core network device such as M-SMF
  • the mobility management network element can send seventh information to the access network device, and the access network device can be used to process the data transmitted on the transmission channel corresponding to the multicast service (for example, the data of the multicast service).
  • the information may instruct the access network device to deactivate the transmission resources used for transmitting the multicast service, for example, delete the QF information used for transmitting the data of the multicast service for the terminal, so as to improve the resource utilization rate.
  • the process of deactivating the transmission channel corresponding to the multicast service provided by the embodiment of the present application can be completed through the signaling interaction between the M-SMF and the mobility management network element, and the signaling interaction between the mobility management network element and the access network equipment.
  • it can save signaling interaction delay , to improve the deactivation efficiency.
  • the transmission channel corresponding to the deactivation of the multicast service may be described as deactivating the multicast session or deactivating the resources corresponding to the multicast session, or deactivating the transmission resources of the multicast session on the RAN side or deactivating the multicast session.
  • the information used to indicate the transmission channel corresponding to the deactivated multicast service may be a deactivation indication information, such as a deactivation indication (deactivation indication), and the information may be carried in an existing message, For example, it can be carried in a Namf_Communication_N1N2 message transfer (Namf_Communication_N1N2messageTransfer) message, which can be a service message provided by AMF for transmitting N1N2 information; or information used to indicate the transmission channel corresponding to the deactivated multicast service (such as the above-mentioned information).
  • the sixth information is carried in a dedicated message, for example, it can be carried in a multicast broadcast service session deactivation request (MBS session deactivation request).
  • deactivating the transmission channel corresponding to the multicast service may include one or more of the following situations: the RAN side will no longer reserve resources for the multicast session; or the RAN side deletes the context information of the multicast session , but retains the transmission channel with MB-UPF; or the RAN base station deletes all relevant information of the multicast session (in this case, the transmission channel of MB-UPF will not be retained).
  • Deactivating the transmission channel corresponding to the multicast service can trigger network elements (such as M-SMF, AMF, RAN, etc.) to release the resources and/or context information corresponding to the multicast service, and can also be used to notify the network element corresponding to the multicast service. (For example, M-SMF, AMF, RAN, etc.) no longer reserve resources for the multicast service based on the previously provided configuration information about the multicast service (eg, context information of the multicast service).
  • the first terminal is UE
  • the access network equipment is RAN
  • the mobility management network element is AMF
  • the first session management network element is SMF
  • the second session management network element is M-SMF.
  • the user plane function is UPF
  • the multicast user plane function is M-UPF as an example, the deactivation method is introduced:
  • FIG. 15 is a method for communicating a multicast service provided by an embodiment of the present application. Before the method shown in FIG. 15 is executed, a multicast session corresponding to the multicast service is in an active state.
  • the AMF may store multicast QF information corresponding to the multicast service and unicast QF information corresponding to the multicast service, and the unicast QF information corresponding to the multicast service corresponds to the UE.
  • the multicast QF information corresponding to the multicast service and the unicast QF information corresponding to the multicast service may be carried by the SMF in the first information and sent to the AMF as described in the embodiment corresponding to FIG. 7 , and stored locally by the AMF.
  • the AMF may store the correspondence between the identification information of the multicast service and the identification information of the SMF corresponding to the multicast service. For example, when the UE joins the multicast group corresponding to the multicast service through the PDU session establishment process or the PDU session modification process, the AMF finds the SMF that establishes the session for the UE, and stores the identification information of the SMF corresponding to the multicast service. As shown in Figure 15, the method may include:
  • the M-UPF detects that it has not received the data of the multicast service for a long time, and determines to deactivate the multicast session corresponding to the deactivated multicast service.
  • the M-UPF notifies the M-SMF to deactivate the multicast session corresponding to the multicast service.
  • the M-UPF can send a notification message to the M-SMF, and the notification message can include the identification information of the multicast service.
  • the M-SMF can determine the corresponding information for deactivating the multicast service according to the identification information of the multicast service. Multicast session.
  • the notification message includes the identification information of the multicast service and a deactivation indication (such as deactivation indication).
  • the M-SMF can learn that a session is to be activated according to the deactivation instruction, and then according to the multicast service
  • the identification information of the multicast service determines to deactivate the multicast session corresponding to the multicast service.
  • the identification information of the multicast service can be described in the embodiment corresponding to FIG. 7 , such as the MBS session ID, or other identification information, such as the PFCP Session ID.
  • the M-SMF can obtain the MBS session ID according to the PFCP session ID. .
  • the M-SMF sends sixth information to the AMF.
  • the AMF receives the sixth information.
  • the sixth information may be used to trigger deactivation of the transmission channel corresponding to the multicast service, such as triggering deactivation of the transmission channel between the RAN and the UPF, the UPF and the M-UPF for transmitting the data of the multicast service, or deactivating the transmission channel of the multicast service.
  • the sixth information may carry the identification information of the multicast service, such as the MBS session ID, and may also carry a deactivation indication, where the deactivation indication is used to indicate deactivation of a transmission channel managed/established by the M-SMF.
  • the sixth information may be carried in the N11 message.
  • the transmission channel corresponding to the multicast service may be an N3 channel used for transmitting data of the multicast service, or an MB-N3 channel used for transmitting the data of the multicast service, or may also refer to the multicast service
  • the corresponding transmission resources on the transmission channel are not limited.
  • the transmission channel corresponding to the multicast service may be managed by the M-SMF.
  • the M-SMF used to manage the transmission channel corresponding to the multicast service may refer to the second session management network element managing the parameters corresponding to the transmission channel, such as generating QoS template information of the multicast session, and for example, generating the endpoint address information of the transmission channel, For example IP address etc.
  • the M-SMF sending the sixth information to the AMF may include: the sixth information includes the identification information of the multicast service, and the M-SMF finds the identification information of the AMF corresponding to the multicast service according to the identification information of the multicast service, and according to The identification information of the AMF sends sixth information to the AMF.
  • the M-SMF can find the identification information of the AMF corresponding to the multicast service according to the identification information of the multicast service and the correspondence between the identification information of the multicast service and the identification information of the AMF.
  • the M-SMF may store the correspondence between the identification information of the multicast service and the identification information of the AMF. For example, when the UE requests the M-SMF to establish a multicast session corresponding to the multicast service through the AMF, the AMF finds the M-SMF that establishes the multicast session for the UE, and requests the M-SMF to establish the multicast session for the UE. , the M-SMF establishes a multicast session for the UE after receiving the request, and can store the corresponding relationship between the identification information of the multicast service and the identification information of the AMF.
  • S1504 The AMF acquires the transmission mode of the multicast service according to the sixth information. If the transmission mode of the multicast service is the shared transmission mode, execute the following S1505. If the transmission mode of the multicast service is the individual transmission mode, the following S1506-S1507 are performed.
  • the AMF may acquire the UEs that join the multicast group corresponding to the multicast service, determine the RAN corresponding to the UE, and determine the transmission mode of the multicast service according to the capability information of the RAN.
  • the sixth information may carry the identification information of the multicast service
  • the AMF obtains the identification information of the multicast service according to the identification information of the multicast service and the corresponding relationship between the multicast service and the transmission mode of the multicast service. transfer mode.
  • the correspondence between the multicast service and the transmission mode of the multicast service is stored on the AMF.
  • the transmission mode of the multicast service is stored in the context of the UE, and the AMF finds the context of the UE in the multicast group corresponding to the multicast service, and obtains the transmission mode of the multicast service from the context of the UE.
  • the AMF sends the seventh information to the RAN.
  • the RAN receives the seventh information.
  • the seventh information may be used to delete the multicast QF information corresponding to the multicast service.
  • the seventh information may carry the identification information of the multicast service, and may also carry a deactivation indication.
  • the seventh information may be carried in the N11 message.
  • the seventh information may be a message, which may be a multicast session resource release (multicast session resource release) message or a multicast broadcast (multicast broadcast session resource release) message or a multicast broadcast session stop (multicast broadcast session stop) message middle.
  • the seventh information is indication information for indicating deactivation of the multicast session, which may be carried in a multicast session resource modify (multicast session resource modify) message.
  • the seventh information will include the identification information of the multicast service, or other information that can generate the identification information of the multicast service, such as the identification information of the N2 connection corresponding to the identification information of the multicast service.
  • the AMF sends the eighth information to the SMF. Accordingly, the SMF receives the eighth information.
  • the eighth information may be used to deactivate or delete the multicast QF information corresponding to the multicast service.
  • the eighth information may carry identification information of the multicast service, and may also carry a deactivation indication and other information, such as a UE list.
  • the UE list may include identification information of UEs that join a multicast group corresponding to the multicast service.
  • the eighth information may be carried in the N11 message.
  • the eighth information may be deactivation indication information, which may be carried in the Nsmf_PDUSession_UpdateSMContext Request message. It contains the identification information of the multicast session.
  • the AMF sending the eighth information to the SMF may include: the eighth information includes the identification information of the multicast service, the AMF finds the identification information of the SMF corresponding to the multicast service according to the identification information of the multicast service, and according to the identification information of the SMF An eighth message is sent to the AMF.
  • the AMF may find the identification information of the AMF corresponding to the multicast service according to the identification information of the multicast service, the correspondence between the identification information of the multicast service and the identification information of the SMF.
  • the correspondence between the identification information of the multicast service and the identification information of the SMF can be found by the AMF when the UE joins the multicast group corresponding to the multicast service through the PDU session establishment process or the PDU session modification process.
  • the SMF of the session is established for the UE, and the identification information of the SMF corresponding to the multicast service is stored.
  • the SMF sends an N2 message to the RAN through the AMF according to the eighth information.
  • the N2 message may carry session modification information, and the session modification information may be used to delete the unicast QF information corresponding to the multicast service and/or deactivate the corresponding multicast service
  • the unicast QF information corresponding to the multicast service corresponds to the UE, and is used to receive data of the multicast service for a terminal in the multicast group corresponding to the multicast service.
  • the RAN receives the N2 message, obtains session modification information from the N2 message, and modifies the PDU session to which the unicast QF belongs, such as deleting the unicast QF information corresponding to the multicast service and/or deactivating the unicast QF corresponding to the multicast service. .
  • deleting the unicast QF information corresponding to the multicast service may include: deleting the unicast QF information corresponding to the unicast QF information, and/or deleting the QF information from the context of the PDU session, etc.
  • the unicast QF corresponding to deactivating the multicast service may be replaced by the QF described as deactivating the PDU session to which the unicast QF belongs and used for transmitting the data of the multicast service, or deactivating the resources corresponding to the unicast QF or deactivating the unicast QF.
  • deactivating the unicast QF corresponding to the multicast service may include one or more of the following situations: the RAN side will no longer reserve resources for the unicast QF; or the RAN side deletes the unicast QF The context information of the QF, but the transmission channel with the UPF is reserved; or the RAN base station deletes all the related information of the unicast QF (at this time, the transmission channel corresponding to the unicast QF between the RAN and the UPF will not be retained).
  • Deactivating the unicast QF corresponding to the multicast service can trigger the network element (such as the RAN, etc.) to release the resources and/or context information corresponding to the unicast QF, and can be used to notify the network element (such as the RAN, etc.) corresponding to the multicast service.
  • Resources and the like are no longer reserved for the multicast service based on the previously provided configuration information about the unicast QF (for example, the unicast QF information corresponding to the multicast service, etc.).
  • the SMF may further instruct the AMF to delete the context information of the multicast service corresponding to the UE according to the eighth information.
  • the transmission mode of the multicast service is determined according to the capability information of the RAN corresponding to the UE, and the transmission mode of the multicast service is determined according to the transmission mode of the multicast service. the QF information.
  • the core network device triggers the AMF to notify other network elements to delete the QF information, reducing the signaling interaction between network elements when deactivating the session. to improve the efficiency of deactivating sessions.
  • CM_idle control management_idle state
  • idle state idle state
  • the SMF processes the join request of the UE.
  • the SMF needs to notify the UE, since the SMF does not know the paging range of the UE, the SMF needs to send the relevant information of the UE (such as the identification information of the UE that needs to be paging) to the AMF. In this way, the SMF needs to provide the relevant information of the UE to the AMF every time the UE is paged, resulting in additional signaling overhead.
  • the present application also provides a communication method for multicast services, in which the AMF learns which UEs correspond to which multicast services (or which which multicast services correspond to the multicast group), so that when the UE needs to be paged, the AMF does not need to obtain the relevant information of the UE from other network elements, but paging the multicast group in the CM_idle according to the information it knows in advance.
  • the terminal in the CM_idle state is switched to the CM connected state (CM_connected state) (or called the RRC connected state or the connected state) to receive the data of the multicast service.
  • CM_connected state or called the RRC connected state or the connected state
  • Idle state may refer to disconnecting the RRC connection between the terminal and the access network device.
  • the idle state may be referred to as the RRC_idle state.
  • the context of the terminal is not stored in the access network equipment, there is no NAS signaling connection between the terminal and the core network equipment (such as the mobility management network element), and the access network equipment and the core network equipment (such as the mobility management network element) There is no N2 connection between ), and the core network device saves the context of the terminal.
  • the access network device does not know whether the terminal is within the coverage of the access network device.
  • the core network device does not know which access network device the terminal is covered by or within the management range, and the access network device does not know through which access network device the terminal can be located or found.
  • CM connection state It can refer to the existence of a non-access stratum (NAS) signaling connection between the terminal and core network equipment (such as mobility management network elements), and an N2 connection between the access network equipment and the core network equipment. .
  • NAS non-access stratum
  • core network equipment such as mobility management network elements
  • N2 connection between the access network equipment and the core network equipment.
  • both the access network device and the core network device save the context of the terminal.
  • the access network device knows that the terminal is within the coverage of the access network device or within the management range of the access network device.
  • the core network device knows through which access network device the terminal can be located or found.
  • the terminal can perform downlink data and/or uplink data transmission with the access network equipment.
  • FIG. 16 is another method for communicating a multicast service provided by an embodiment of the application. As shown in FIG. 16 , the method may include:
  • the mobility management network element receives ninth information.
  • the ninth information may be used to trigger paging of terminals in the multicast group corresponding to the multicast service.
  • the ninth information may be a message for activating a multicast session corresponding to the multicast service.
  • the mobility management network element triggers paging of the terminals in the multicast group corresponding to the multicast service.
  • the ninth information may include identification information of the multicast service. For the relevant description/definition of the identification information of the multicast service, reference may be made to the description in S701, which will not be repeated.
  • the mobility management network element may receive the ninth information from the second session management network element; or receive the ninth information from the first session management network element, or receive the ninth information from the M-UPF, etc. limit.
  • S1602 The mobility management network element pages the first terminal according to the nine information.
  • the first terminal belongs to the multicast group corresponding to the multicast service, and may be any terminal in the ilde state of the multicast group corresponding to the multicast service.
  • the ninth information carries the identification information of the multicast service
  • the mobility management network element determines, according to the identification information of the multicast service, the corresponding information of the multicast service.
  • the multicast group includes a first terminal, and the first terminal is in an idle state; the mobility management network element determines, according to the capability information of the access network device corresponding to the first terminal and the registration area of the first terminal, that the first terminal corresponds to the first terminal. in the paging area, paging the first terminal in the paging area.
  • the mobility management network element sends a paging message carrying the identification information of the first terminal in the paging area of the first terminal, and the paging message can be used to page the first terminal.
  • the paging area of the first terminal may include an area in the registration area of the first terminal except the area covered by the access network device that does not have the multicast capability.
  • the registration area of the first terminal may be allocated to the first terminal by the mobility management network element when the first terminal registers and joins the network through the mobility management network element.
  • Access network devices that do not have the multicast capability can be known from the mobility management network element based on the capability information of the access network device.
  • the area covered by each access network device can be set based on the operator, or assigned to the access network by the mobility management network element. Network access devices are not restricted.
  • the mobile management network element determines that the multicast group corresponding to the multicast service includes the first terminal according to the identification information of the multicast service, and may include the following methods:
  • the mobility management network element determines that the multicast group corresponding to the multicast service includes the first terminal according to the identification information of the multicast service and the list of user equipment UEs corresponding to the multicast service.
  • the UE list may include identification information of terminals that join the multicast group corresponding to the multicast service.
  • the list of UEs corresponding to the multicast service may be pre-stored on the mobility management network element and maintained locally by the mobility management network element.
  • the mobility management network element receives a join request from the first terminal or the first session management network element, and the join request can be used to request that the first terminal be added to the multicast group corresponding to the multicast service; , adding the identification information of the first terminal to the UE list.
  • the identity of the second terminal is believed to be added to the UE list and so on.
  • the UE list corresponding to the multicast service may be maintained locally by the first session management network element, and sent by the first session management network element to the mobility management network element.
  • the first session management network element may receive a join request from the first terminal, and the join request is used to request to join the multicast group corresponding to the multicast service.
  • the identification information of the terminal is added to the UE list, and tenth information is sent to the mobility management network element, where the tenth information may be used to instruct the terminal to join the multicast group corresponding to the multicast service.
  • the tenth information includes identification information of the multicast service and a list of UEs corresponding to the multicast service.
  • the mobility management network element receives the identification information of the multicast service and the UE list corresponding to the multicast service, and stores the multicast service and the UE list correspondingly.
  • the mobility management network element can query the locally stored UE context, and judge whether the UE corresponding to the UE context is included in the multicast group corresponding to the multicast service according to whether the UE context includes the identification information of the multicast service. For example, if it is found that the UE context of the first terminal includes the identification information of the multicast service, it can be determined that the first terminal is included in the multicast group corresponding to the multicast service identified by the identification information of the multicast service.
  • the first session management network element may send the tenth information to the mobility management network element, and the tenth information is sent to the mobility management network element. It can be used to instruct the terminal to join the multicast group corresponding to the multicast service.
  • the tenth information includes the identification information of the multicast service and one or more of the following information: the identification information of the first terminal, or the identification information of the PDU session of the first terminal.
  • the mobility management network element saves the received information in the UE context of the first terminal.
  • the mobility management network element may save the identification information of the multicast service and other information in the context of the PDU session of the first terminal , and then determine whether the first terminal is included in the multicast group according to whether the context of the PDU session of the first terminal includes the identification information of the multicast service.
  • the first session management network element may carry the tenth information in the service-oriented interface (Nsmf)_PDU session update session management context response (Nsmf_PDUSession_UpdateSMContext response) message between the SMF and the AMF and send it to the mobility management network element .
  • Nsmf_PDUSession_UpdateSMContext response service-oriented interface
  • the mobility management network element determining that the first terminal is in the idle state may include: the mobility management network element finds the UE context of the first terminal according to the identification information of the first terminal, if the current CM state in the UE context of the first terminal is in the current CM state In the idle state, it can be determined that the first terminal is in the idle state.
  • the mobility management network element may also page other terminals in the idle state, such as the second terminal, the third terminal, and the fourth terminal, in the multicast group corresponding to the multicast service according to the nine information.
  • the method of paging other terminals is the same as the method of paging the first terminal, which will not be repeated.
  • the first terminal receives the paging of the mobility management network element, for example, receives a paging message from the mobility management network element in the paging area of the first terminal, and if it is found that the paging message carries its own identification information, then determine itself After being paged, a paging response is sent to the mobility management network element through the access network device.
  • the mobility management network element After the mobility management network element receives the paging response (such as a service request) of the first terminal, the mobility management network element instructs the access network device to perform RRC reconfiguration on the first terminal, and switches the first terminal from the idle state to the first terminal. RRC connected state, receiving data of multicast services.
  • the mobility management network element when the mobility management network element receives the ninth information sent by the core network device, it triggers the mobility management network element to page the idle terminals in the multicast group corresponding to the multicast service, without the need for
  • the first session management network element instructs the mobility management network element which terminals to page, thereby reducing signaling overhead caused by paging terminals and simplifying system design.
  • each node such as the mobility management network element, the first session management network element, etc.
  • each node includes hardware structures and/or software modules corresponding to each function in order to implement the above functions.
  • the present application can be implemented in hardware or in the form of a combination of hardware and computer software, in conjunction with the algorithm steps of the examples described in the embodiments disclosed herein. Whether a function is performed by hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of this application.
  • the mobility management network element, the first session management network element, and the like may be divided into functional modules according to the foregoing method examples.
  • each functional module may be divided corresponding to each function, or two or more functions may be divided into two or more functional modules.
  • integrated in a processing module can be implemented in the form of hardware, and can also be implemented in the form of software function modules. It should be noted that, the division of modules in the embodiments of the present application is schematic, and is only a logical function division, and there may be other division manners in actual implementation.
  • FIG. 17 shows a structural diagram of a communication apparatus 170
  • the communication apparatus 170 may be a first session management network element, a chip in the first session management network element, a system-on-chip, or other devices capable of implementing the first session management in the above method. Devices for the functions of network elements, etc.
  • the communication apparatus 170 may be configured to perform the function of the first session management network element involved in the foregoing method embodiments.
  • the communication apparatus 170 shown in FIG. 17 includes: a processing unit 1701 , a receiving unit 1702 and a sending unit 1703 .
  • the receiving unit 1702 is used to receive the information of the multicast service corresponding to the first terminal from the mobility management network element, the information may include transmission mode information and/or status information, wherein the transmission mode information may be For indicating the transmission mode of the multicast service, the state information can be used to indicate that the multicast session corresponding to the multicast service is in a deactivated state; the first session management network element is based on the information of the multicast service corresponding to the first terminal.
  • the receiving unit 1702 may support the communication device 170 to perform S701, S805, and S1003.
  • the sending unit 1703 is configured to send the first information including the QF information for transmitting the data of the multicast service for the first terminal to the mobility management network element.
  • the sending unit 1703 may support the communication apparatus 170 to perform S702, S814, and S1006.
  • the receiving unit 1702 is configured to receive the eighth information for deleting the unicast QF corresponding to the multicast service and/or deactivating the unicast QF from the mobility management network element.
  • the receiving unit 1702 may support the communication device 170 to perform S1506.
  • the sending unit 1703 is configured to send an N2 message to the access network device according to the eighth information; the access network device corresponds to the unicast QF, and the N2 message is used to instruct to modify the protocol data unit PDU session to which the unicast QF belongs.
  • the sending unit 1703 is used to support the communication device 170 to perform S1507.
  • the receiving unit 1702 is configured to receive a joining request from the first terminal for requesting to join a multicast group corresponding to the multicast service.
  • the sending unit 1703 is configured to send tenth information for instructing the terminal to join the multicast group corresponding to the multicast service to the mobility management network element according to the joining request of the first terminal.
  • the communication device 170 is configured to perform the function of the first session management network element in the multicast service communication method shown in the methods shown in FIG. 7 to FIG. 16 , so it can achieve the same effect as the above multicast service communication method.
  • the communication apparatus 170 shown in FIG. 17 includes: a processing module and a communication module.
  • the processing module is used to control and manage the actions of the communication device 170 , for example, the processing module may integrate the functions of the processing unit 1701 .
  • the communication module can integrate the functions of the sending unit 1703 and the receiving unit 1702, perform S701, S805, S1003, S702, S814, S1006, S1506, S1507 and communicate with other network entities, such as with the function modules shown in FIG. 4 or FIG. 5 or communication between network entities.
  • the communication device 170 may further include a storage module for storing instructions and/or data. When the instruction is executed by the processing module, the processing module implements the method on the network element side of the first session management.
  • the processing module may be a processor, a controller, a module or a circuit. It may implement or execute various exemplary logic blocks described in connection with the disclosure of the embodiments of the present application.
  • the communication module may be a transceiver circuit, a pin, an interface circuit, a bus interface, or a communication interface.
  • the storage module may be a memory. When the processing module is a processor, the communication module is a communication interface, and the storage module is a memory, the communication device 170 involved in this embodiment of the present application may be the communication device 600 shown in FIG. 6 .
  • FIG. 18 shows a structural diagram of a communication device 180.
  • the communication device 180 may be a mobility management network element, a chip in the mobility management network element, a system-on-chip, or other devices capable of implementing the functions of the mobility management network element in the above method, etc. .
  • the communication apparatus 180 may be configured to perform the functions of the mobility management network elements involved in the above method embodiments.
  • the communication apparatus 180 shown in FIG. 18 includes: a processing unit 1801 , a receiving unit 1802 , and a sending unit 1803 .
  • the sending unit 1803 is configured to send the information of the multicast service corresponding to the first terminal to the first session management network element, and the information of the multicast service corresponding to the first terminal includes at least one of the following: transmission mode information, or state information, the transmission mode information is used to indicate the transmission mode of the multicast service, and the state information is used to indicate that the multicast session corresponding to the multicast service is in a deactivated state.
  • the sending unit 1803 can support the communication apparatus 180 to perform S701, S805, and S1003.
  • the receiving unit 1802 is configured to receive first information from the first session management network element, where the first information includes QF information used to transmit data of a multicast service for the first terminal.
  • the receiving unit 1802 may support the communication device 180 to perform S702, S814, and S1006.
  • the receiving unit 1802 is configured to receive fourth information from the second session management network element for triggering activation of the transmission channel corresponding to the multicast service.
  • the receiving unit 1802 may support the communication device 180 to perform S1403.
  • the processing unit 1801 is configured to acquire the transmission mode of the multicast service according to the fourth information.
  • the processing unit 1801 may support the communication device 180 to perform S1407.
  • the sending unit 1803 is configured to send the QF information of the multicast service to the access network device according to the transmission mode of the multicast service, and the access network device is used to process the data transmitted on the transmission channel corresponding to the multicast service, and the QF information of the multicast service is Information is used to transmit data for multicast services.
  • the sending unit 1803 can support the communication device 180 to perform S1408 and S1413.
  • the receiving unit 1802 is configured to receive sixth information from the second session management network element for triggering deactivation of the transmission channel corresponding to the multicast service.
  • the receiving unit 1802 may support the communication device 180 to perform S1503.
  • the processing unit 1801 is configured to acquire the transmission mode of the multicast service according to the sixth information.
  • the processing unit 1801 may support the communication apparatus 180 to perform S1504.
  • the sending unit 1803 is configured to send the seventh information to the access network device according to the sixth information when the transmission mode of the multicast service is the shared transmission mode; the access network device is used to process the transmission on the transmission channel corresponding to the multicast service or, when the transmission mode of the multicast service is the unicast transmission mode, send the eighth information to the first session management network element; wherein, the seventh information is used to deactivate the transmission channel corresponding to the multicast service; the eighth information is used to deactivate the transmission channel corresponding to the multicast service; The information is used to delete the unicast QF information corresponding to the multicast service and/or deactivate the unicast QF, and the unicast QF is used to transmit the data of the multicast service for a terminal in the multicast group corresponding to the multicast service.
  • the sending unit 1803 can support the communication device 180 to perform S1507 and S1506.
  • the receiving unit 1802 is configured to receive ninth information of a terminal in a multicast group corresponding to triggering the paging multicast service.
  • the receiving unit 1802 may support the communication device 180 to perform S1601.
  • the sending unit 1803 is configured to page the first terminal according to the ninth information, where the first terminal belongs to the multicast group corresponding to the multicast service.
  • the sending unit 1803 may support the communication apparatus 180 to perform S1602.
  • the communication device 180 is configured to perform the function of the mobility management network element in the communication method of the multicast service shown in the methods shown in Figs.
  • the communication apparatus 180 shown in FIG. 18 includes: a processing module and a communication module.
  • the processing module is used to control and manage the actions of the communication device 180.
  • the processing module can integrate the functions of the processing unit 1801, and can be used to support the communication device 180 to perform steps such as S1407 and S1504.
  • the communication module can integrate the functions of the sending unit 1803 and the receiving unit 1802, such as performing S701, S805, S1003, S702, S814, S1006, S1403, S1408, S1413, S1503, S1507, S1506, S1601, S1602, etc. and communicating with other network entities Communication, such as communication with the functional modules or network entities shown in FIG. 4 or FIG. 5 .
  • the communication device 180 may further include a storage module for storing instructions and/or data. When the instruction is executed by the processing module, the processing module implements the above method on the network element side of mobility management.
  • the processing module may be a processor, a controller, a module or a circuit. It may implement or execute various exemplary logic blocks described in connection with the disclosure of the embodiments of the present application.
  • the communication module may be a transceiver circuit, a pin, an interface circuit, a bus interface, or a communication interface.
  • the storage module may be a memory. When the processing module is a processor, the communication module is a communication interface, and the storage module is a memory, the communication device 180 involved in this embodiment of the present application may be the communication device 600 shown in FIG. 6 .
  • 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 can implement or
  • a general purpose processor may be a microprocessor or any conventional processor or the like.
  • the steps of the methods disclosed in conjunction with the embodiments of the present application may be directly embodied as executed by a hardware processor, or executed by a combination of hardware and software modules in the processor.
  • the memory may be a non-volatile memory, such as a hard disk drive (HDD) or a solid-state drive (SSD), etc., or may also be a volatile memory (volatile memory), for example Random-access memory (RAM).
  • Memory is, but is not limited to, any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer.
  • the memory in this embodiment of the present application may also be a circuit or any other device capable of implementing a storage function, for storing instructions and/or data.
  • FIG. 19 is a structural diagram of a communication system provided by an embodiment of the application.
  • the communication system may include: a terminal, a mobility management network element 190 and a first session management network element 191 .
  • FIG. 19 is only an exemplary drawing, and the embodiment of the present application does not limit the network elements and the number of network elements included in the communication system shown in FIG. 19 .
  • the mobility management network element 190 has the functions of the mobility management network element in one or more of the methods shown in FIG. 7 to FIG. 16 .
  • the first session management network element 191 has the function of the first session management network element in one or more of the methods shown in FIG. 7 to FIG. 16 .
  • “/” may indicate that the objects associated before and after are an “or” relationship, for example, A/B may indicate A or B; “and/or” may be used to describe that there are three types of associated objects A relationship, for example, A and/or B, can mean that A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural.
  • words such as “first” and “second” may be used to distinguish technical features with the same or similar functions. The words “first”, “second” and the like do not limit the quantity and execution order, and the words “first”, “second” and the like do not limit the difference.
  • words such as “exemplary” or “for example” are used to represent examples, illustrations or illustrations, and any embodiment or design solution described as “exemplary” or “for example” should not be construed are preferred or advantageous over other embodiments or designs.
  • the use of words such as “exemplary” or “such as” is intended to present the relevant concepts in a specific manner to facilitate understanding.
  • the technical feature is distinguished by “first”, “second”, “third”, “A”, “B”, “C” and “D”, etc.
  • the technical features described in the “first”, “second”, “third”, “A”, “B”, “C” and “D” described technical features in no order or order of magnitude.
  • connection in the embodiments of the present application, refers to various connection modes such as direct connection or indirect connection, so as to realize communication between devices, which is not limited in the embodiments of the present application.
  • transmission in the embodiments of the present application refers to bidirectional transmission, including the actions of sending and/or receiving.
  • transmission in the embodiments of the present application includes data transmission, data reception, or data transmission and data reception.
  • the data transmission here includes uplink and/or downlink data transmission.
  • Data may include channels and/or signals, uplink data transmission is uplink channel and/or uplink signal transmission, and downlink data transmission is downlink channel and/or downlink signal transmission.
  • Network and “system” appearing in the embodiments of this application express the same concept, and a communication system is a communication network.
  • the division of modules in the embodiments of the present application is schematic, and is only a logical function division. In actual implementation, there may be other division methods.
  • the functional modules in the various embodiments of the present application may be integrated into one processing unit. In the device, it can also exist physically alone, or two or more modules can be integrated into one module.
  • the above-mentioned integrated modules can be implemented in the form of hardware, and can also be implemented in the form of software function modules.
  • the technical solutions provided in the embodiments of the present application may be implemented in whole or in part by software, hardware, firmware, or any combination thereof.
  • software When implemented in software, it can be implemented in whole or in part in the form of a computer program product.
  • the computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present application are generated.
  • the computer may be a general purpose computer, a special purpose computer, a computer network, a wireless control device, an access network device, a terminal, or other programmable devices.
  • the computer instructions may be stored in or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions may be downloaded from a website site, computer, server or data center Transmission to another website site, computer, server, or data center by wire (eg, coaxial cable, optical fiber, digital subscriber line, DSL) or wireless (eg, infrared, wireless, microwave, etc.).
  • the computer-readable storage medium can be any available media that can be accessed by a computer, or a data storage device such as a server, data center, etc. that includes one or more available media integrated.
  • the usable media may be magnetic media (eg, floppy disks, hard disks, magnetic tapes), optical media (eg, digital video discs (DVDs)), or semiconductor media, and the like.
  • the embodiments may refer to each other.
  • the methods and/or terms between the method embodiments may refer to each other, such as the functions and/or the device embodiments.
  • terms may refer to each other, eg, functions and/or terms between an apparatus embodiment and a method embodiment may refer to each other.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Multimedia (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

Les modes de réalisation de la présente demande se rapportent au domaine technique des communications. L'invention concerne un procédé et un appareil de communication pour un service de multidiffusion, le procédé et l'appareil étant utilisés pour optimiser le flux de traitement du service de multidiffusion. Le procédé peut comprendre les étapes suivantes : un élément de réseau de gestion de mobilité envoie, à un premier élément de réseau de gestion de session, des informations d'un service de multidiffusion correspondant à un premier terminal (S701), les informations du service de multidiffusion correspondant au premier terminal comprenant au moins l'un des éléments suivants : des informations de mode de transmission, ou des informations d'état, les informations de mode de transmission étant utilisées pour indiquer un mode de transmission du service de multidiffusion, et les informations d'état étant utilisées pour représenter qu'une session de multidiffusion correspondant au service de multidiffusion est dans un état désactivé ; et le premier élément de réseau de gestion de session recevant les informations du service de multidiffusion correspondant au premier terminal, et envoyer des premières informations à l'élément de réseau de gestion de mobilité en fonction des informations du service de multidiffusion correspondant au premier terminal (S702), les premières informations comprenant des informations QF de données pour transmettre le service de multidiffusion pour le premier terminal.
PCT/CN2022/081955 2021-04-06 2022-03-21 Procédé et appareil de communication pour service de multidiffusion WO2022213799A1 (fr)

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