WO2021233196A1 - 加入组播广播业务mbs会话的方法及装置 - Google Patents

加入组播广播业务mbs会话的方法及装置 Download PDF

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Publication number
WO2021233196A1
WO2021233196A1 PCT/CN2021/093586 CN2021093586W WO2021233196A1 WO 2021233196 A1 WO2021233196 A1 WO 2021233196A1 CN 2021093586 W CN2021093586 W CN 2021093586W WO 2021233196 A1 WO2021233196 A1 WO 2021233196A1
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smf
information
mbs
session
nrf
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PCT/CN2021/093586
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English (en)
French (fr)
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段小嫣
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大唐移动通信设备有限公司
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Priority to US17/923,914 priority Critical patent/US20230179959A1/en
Priority to EP21808780.7A priority patent/EP4156731A4/en
Publication of WO2021233196A1 publication Critical patent/WO2021233196A1/zh

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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
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W60/00—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
    • H04W60/04—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration using triggered events
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/18—Processing of user or subscriber data, e.g. subscribed services, user preferences or user profiles; Transfer of user or subscriber data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/24—Interfaces between hierarchically similar devices between backbone network devices

Definitions

  • This application relates to the field of wireless communication technology, and provides a method and device for joining a multicast broadcast service MBS session.
  • the fifth generation mobile communication system supports the multicast broadcast service (Multicast Broadcast Service, MBS) to realize the fourth version of the Internet Protocol (Internet Protocol Version 4, IPv4)/the sixth version of the Internet Protocol (Internet Protocol Version 4, IPv4).
  • MBS Multicast Broadcast Service
  • Protocol Version 6, IPv6 multicast/broadcast, Internet Protocol Television (IPTV) and other business data transmission, or optimization of group communication, Internet of Things (IoT) communications, Vehicle to Everything, V2X)
  • IoT Internet of Things
  • V2X Vehicle to Everything
  • the transmission efficiency of other services such as communications and the efficiency of network resource utilization.
  • 5G needs to add a user terminal (User Equipment, UE) with MBS requirements to the MBS session.
  • UE User Equipment
  • the Access and Mobility Management Function receives the request message sent by the UE to join the MBS session, and selects the service for the UE In the protocol data unit (Protocol Data Unit, PDU) session and the MBS session session management function (Session Management Function, SMF), in this way, the UE can join the MBS session and receive the user plane function (User Plane Function) through the PDU session channel , UPF) MBS data sent.
  • PDU Protocol Data Unit
  • SMF Session Management Function
  • the above method of joining the MBS session will cause the following problems: when different AMFs receive requests to join the same MBS session from multiple UEs, different AMFs may select different SMFs and add the corresponding UEs to the same MBS session. In an MBS session, multiple SMFs serve the same MBS session, resulting in complicated MBS session management, and even MBS data cannot be sent to the UE normally.
  • the embodiment of the present application provides a new method for joining an MBS session.
  • the embodiments of the present application provide a method and device for joining an MBS session to solve the problem of complicated MBS session management.
  • an embodiment of the present application provides a method for joining a multicast broadcast service MBS session, which is applied to a network device, and the method includes:
  • the network equipment receives the MBS information sent by the user terminal UE;
  • the network device determines, according to the MBS information, the information of the first session management function SMF that currently serves the MBS session corresponding to the MBS information;
  • the network device sends the MBS information to the first SMF according to the information of the first SMF, so that the first SMF adds the UE to the MBS session.
  • the network device is an access and mobility management function AMF;
  • the network equipment receiving the MBS information sent by the user terminal UE includes:
  • the AMF receives the first request message that includes the MBS information sent by the UE; or,
  • the AMF receives a second request message containing the MBS information sent by a second SMF, where the second SMF is an SMF serving a PDU session of the UE.
  • the network device is the second SMF, where the second SMF is an SMF serving a PDU session of the UE;
  • the network equipment receiving the MBS information sent by the user terminal UE includes:
  • the second SMF receives a third request message containing the MBS information sent by the UPF, where the third request message is generated by the UPF based on the MBS information sent by the UE through the PDU session.
  • the network device determining the first session management function SMF currently serving the MBS session corresponding to the MBS information according to the MBS information includes:
  • the network device receives the first SMF information sent by the NRF entity.
  • the fourth request message further includes first information, and the first information includes part or all of the following information:
  • Network slice information data network name, public land mobile network identification, service area information.
  • the method further includes:
  • the network device sends the MBS information to the third SMF according to the third SMF information provided by the NRF, so that the third SMF adds the UE to the MBS session;
  • the third SMF has MBS capability.
  • the network device is the AMF
  • the network device sending the MBS information to the first SMF according to the information of the first SMF sent by the NRF includes:
  • the AMF sends the MBS information to the first SMF according to the information of the first SMF; or,
  • the AMF sends the information of the first SMF and the MBS information to the intermediate SMF, so that the intermediate SMF is based on the first SMF.
  • the MBS information is sent to the first SMF, where the service area of the intermediate SMF includes the area where the UE is located.
  • the network device is a second SMF
  • the sending of the MBS information to the first SMF by the network device includes:
  • the second SMF sends the information of the first SMF and the MBS information to the AMF, so that the AMF sends the MBS information to the first SMF.
  • the MBS information includes part or all of the following information:
  • MBS multicast address temporary mobile group ID, MBS session ID.
  • the embodiment of the present application also provides a method for joining a multicast broadcast service MBS session, which is applied to the network database function NRF, and includes:
  • NRF receives MBS information sent by network equipment
  • the NRF determines the first SMF according to the MBS information and stored SMF information, where the first SMF is the SMF currently serving the MBS session corresponding to the MBS information;
  • the NRF provides the first SMF information to the network device, so that the network device adds the user terminal UE to the MBS session through the first SMF.
  • it further includes:
  • the NRF provides the information of the third SMF capable of MBS to the network device, so that the network device can pass the third SMF Adding the UE to the MBS session.
  • the NRF before the NRF receives the MBS information sent by the network device, it further includes:
  • the NRF receives a fifth request message sent by the first SMF, where the fifth request message is used to register or update information about the first SMF, and the information about the first SMF includes information about the MBS session.
  • the embodiment of the present application also provides a method for joining a multicast broadcast service MBS session, which is applied to the session management function SMF, including:
  • SMF configures or establishes an MBS session
  • the SMF information includes the information of the MBS session, so that the NRF provides the network device with the current service to the MBS
  • the SMF information of the session is not limited
  • it further includes:
  • the SMF When the SMF releases the MBS session, it requests the NRF to update the SMF information, and the updating the SMF information includes: deleting the MBS session information from the SMF information.
  • the embodiments of the present application also provide a device for joining a multicast broadcast service MBS session, which is applied to network equipment, and the device includes:
  • the receiving unit is used to receive the MBS information sent by the user terminal UE;
  • the query unit is configured to determine, according to the MBS information, the information of the first session management function SMF currently serving the MBS session corresponding to the MBS information;
  • the processing unit is configured to send the MBS information to the first SMF according to the information of the first SMF, so that the first SMF adds the UE to the MBS session.
  • the network device is an access and mobility management function AMF;
  • the receiving unit is configured to:
  • the network device is the second SMF, where the second SMF is an SMF serving a PDU session of the UE;
  • the receiving unit is configured to:
  • the query unit determine the first session management function SMF currently serving the MBS session corresponding to the MBS information, and the query unit is configured to:
  • the fourth request message further includes first information, and the first information includes part or all of the following information:
  • Network slice information data network name, public land mobile network identification, service area information.
  • the query unit is further configured to:
  • the network device is the AMF
  • the MBS information is sent to the first SMF, and the processing unit is configured to:
  • the service area of the first SMF includes the area where the UE is located, send the MBS information to the first SMF according to the information of the first SMF; or,
  • the service area of the first SMF does not include the area where the UE is located, the information of the first SMF and the MBS information are sent to the intermediate SMF, so that the intermediate SMF sends the MBS information to all In the first SMF, the service area of the intermediate SMF includes the area where the UE is located.
  • the network device is a second SMF
  • the MBS information is sent to the first SMF, and the processing unit is configured to:
  • the information of the first SMF and the MBS information are sent to the AMF, so that the AMF sends the MBS information to the first SMF.
  • the MBS information includes part or all of the following information:
  • MBS multicast address temporary mobile group ID, MBS session ID.
  • the embodiment of the present application also provides a device for joining a multicast broadcast service MBS session, which is applied to the network database function NRF, including:
  • the receiving unit is used to receive the MBS information sent by the network device
  • the query unit is configured to determine a first SMF according to the MBS information and the stored SMF information, where the first SMF is the SMF currently serving the MBS session corresponding to the MBS information;
  • the sending unit is configured to provide the first SMF information to the network device, so that the network device adds the user terminal UE to the MBS session through the first SMF.
  • the query unit is further configured to:
  • the NRF provides the information of the third SMF capable of MBS to the network device, so that the network device can pass the third SMF Adding the UE to the MBS session.
  • the query unit is further configured to:
  • the NRF receives a fifth request message sent by the first SMF, where the fifth request message is used to register or update information about the first SMF, and the information about the first SMF includes information about the MBS session.
  • the embodiments of the present application also provide a device for joining a multicast broadcast service MBS session, which is applied to the session management function SMF, including:
  • the update unit is used to register or update the SMF information with the network database function NRF when configuring or establishing an MBS session.
  • the SMF information includes the MBS session information so that the NRF provides the current service to the network device Information of the SMF in the MBS session.
  • the update unit is further configured to:
  • requesting the NRF to update the SMF information includes: deleting the MBS session information from the SMF information.
  • an embodiment of the present application also provides an electronic device, which includes a processor and a memory, wherein the memory stores program code, and when the program code is executed by the processor, the processing The device executes the steps of any one of the above methods for joining an MBS session.
  • an embodiment of the present application also provides a computer-readable storage medium, which includes program code.
  • the program product runs on an electronic device, the program code is used to cause the electronic device to execute any of the foregoing. Steps of a method of joining an MBS session.
  • the network equipment determines the first SMF information currently serving the MBS session corresponding to the MBS information through the NRF according to the MBS information sent by the UE, and the network equipment then determines the first SMF information of the MBS session corresponding to the MBS information according to the first SMF information, the MBS information is sent to the first SMF, so that the first SMF adds the UE to the MBS session.
  • the network device queries and obtains the SMF currently serving the MBS session, so that one MBS session is served by only one SMF, avoiding the situation that multiple SMFs serve the same MBS session, and simplifying the management of the MBS session.
  • FIG. 1 is a schematic diagram of the architecture of a mobile communication system in an embodiment of the application
  • FIG. 2 is a schematic diagram of the flow of joining an MBS session in an embodiment of the application
  • FIG. 3 is a schematic flowchart of Embodiment 1 in the embodiments of this application.
  • FIG. 4 is a schematic flowchart of Embodiment 2 in an embodiment of the application.
  • FIG. 5 is a schematic flowchart of Embodiment 3 in an embodiment of this application.
  • FIG. 6 is a schematic structural diagram of an apparatus for joining an MBS session applied to a network device according to an embodiment of the application
  • FIG. 7 is a schematic structural diagram of an apparatus for joining an MBS session applied to NRF according to an embodiment of the application
  • FIG. 8 is a schematic structural diagram of an apparatus for joining an MBS session applied to SMF according to an embodiment of the application
  • FIG. 9 is a schematic diagram of the composition structure of an electronic device in an embodiment of the application.
  • an embodiment of the present application provides a mobile communication system, which at least includes a network device 101, a network database function (Network Repository Function, NRF) 102, SMF103, UPF104, and a radio access network (Radio Access Network, RAN) 105.
  • NRF Network Repository Function
  • SMF103 Serving Mobility Management Function
  • UPF104 User Plane Function
  • RAN Radio Access Network
  • the network device 101 is configured to receive a request message for joining the MBS sent by the UE, and according to the MBS information carried in the request message, query the NRF to obtain the SMF currently serving the MBS session corresponding to the MBS information.
  • the NRF 102 is used to determine the SMF currently serving the MBS session corresponding to the MBS information according to the MBS information sent by the network device 101 and the stored SMF information.
  • SMF103 is used to serve the PDU session and MBS session of the UE. Specifically, the SMF103 sends a Session Management (SM) message to the UPF serving the MBS session through the N4 interface.
  • the SM message includes the updated MBS related information, and the related information includes but is not limited to the multicast/broadcast service quality Flow (MBS Quality of Service flow, MBS QoS flow) information and tunnel information for receiving MBS data;
  • MBS QoS flow multicast/broadcast service quality Flow
  • SMF103 sends SM messages to the RAN through the N2 interface, so that the RAN configures a tunnel for receiving MBS data from UPF according to the received SM messages.
  • the radio resource for transmitting MBS data with UE SMF103 sends SM message to UE through N1 interface, so that UE can determine to start receiving MBS data according to SM message.
  • an embodiment of the present application provides a schematic flowchart of joining an MBS session.
  • the network device receives the MBS information sent by the UE.
  • the MBS information represents the identification information of the MBS session that the UE requests to join.
  • the MBS information in the embodiment of this application includes some or all of the following information:
  • MBS Multicast Address MBS Multicast Address
  • Temporary Move Group ID Temporary Move Group ID
  • the TMGI includes MBS service ID; MBS Session ID (MBS Session ID).
  • S202 The network device sends MBS information to the NRF.
  • the NRF receives the MBS information sent by the network device, and determines a first SMF according to the MBS information and the stored SMF information, where the first SMF is the SMF currently serving the MBS session corresponding to the MBS information.
  • the SMF before performing step 203, when the SMF establishes an MBS session, it registers or updates SMF information with the NRF.
  • the SMF information includes information about the MBS session; when the SMF releases the MBS session, it requests the NRF to update the SMF information. Updating the information of the SMF includes: deleting the information of the MBS session from the information of the SMF. In this way, the NRF can determine the SMF currently serving the MBS session corresponding to the MBS information according to the SMF information.
  • the information of the MBS session represents the information that the SMF currently serves the MBS session.
  • the information of the MBS session may include part or all of the following information: MBS multicast address, TMGI, and MBS session identifier.
  • the NRF provides the first SMF information to the network device.
  • the network device sends the MBS information to the first SMF according to the information of the first SMF, so that the first SMF adds the UE to the MBS session.
  • the following three embodiments are provided to describe the process of the UE joining the MBS session.
  • Embodiment 1 When the UE requests to establish a PDU session, the AMF selects the SMF serving the PDU session and the MBS session.
  • FIG. 3 a schematic flowchart of the first embodiment is provided.
  • the UE sends an uplink non-access stratum transmission message carrying MBS information to the AMF.
  • the UE sends an Uplink Non-Access Layer (UL NAS Transport) message to the AMF, and the UL NAS Transport message carries MBS information and SM messages.
  • the SM message here includes a PDU session establishment request; the MBS information represents the identification information of the MBS session that the UE requests to join, and the MBS information is provided by the content provider (CP) of the MBS or the application server (AS)
  • the MBS information may be part or all of the following information: MBS multicast address, TMGI, and MBS session identifier.
  • the AMF sends an NRF network function discovery request containing MBS information to the NRF.
  • the AMF initiates an NRF network function discovery request Nnrf_NFDiscovery_Request to the NRF, and the Nnrf_NFDiscovery_Request is used to query the first SMF corresponding to the information currently serving the MBS.
  • the Nnrf_NFDiscovery_Request carries the NF type and the MBS information provided by the UE.
  • the Nnrf_NFDiscovery_Request can also carry MBS capability indication information and first information.
  • the MBS capability indication information is used to request an SMF with MBS capability.
  • One piece of information is used to limit the service scope of the requested SMF.
  • the first information includes part or all of the following information: network slice information, data network name (DNN), public land mobile network ID (Public Land Mobile Network ID, PLMN ID), and service area information.
  • Network slice information includes single network slice selection auxiliary information (A Single Network Slice Selects Auxiliary Information, S-NSSAI), network slice instance ID (Network Slice Instance ID, NSI); service area information includes Tracking Area Identifier (TAI) ), tracking area identification list (TAI List, that is, multiple TAIs).
  • S-NSSAI Single Network Slice Selects Auxiliary Information
  • NSI Network Slice Instance ID
  • service area information includes Tracking Area Identifier (TAI) ), tracking area identification list (TAI List, that is, multiple TAIs).
  • S303a When the NRF determines that there is an SMF currently serving the MBS session corresponding to the MBS information according to the received MBS information and the stored SMF information, it sends an NRF network function discovery request response containing the information of the first SMF to the AMF.
  • the SMF Before performing step 303a, when the SMF establishes the MBS session, it initiates the NRF network function management registration Nnrf_NFManagement_NFRegister containing the information of the registered SMF or the NRF network function management information update Nnrf_NFManagement_NFUpdate containing the information of the updated SMF to the NRF, where the information of the SMF includes Information about the MBS session; when the SMF releases the MBS session, it initiates an Nnrf_NFManagement_NFUpdate containing the updated SMF information to the NRF.
  • the updated SMF information includes: deleting the MBS session information from the SMF information. In this way, the NRF can determine the SMF currently serving the MBS session corresponding to the MBS information according to the SMF information.
  • SMF can obtain MBS session information in any of the following ways:
  • the MBS CP or AS provides the UE with MBS information, and when the UE initiates the first request message to join the MBS session, the UE provides it to the SMF;
  • SMF is directly configured by CP or AS, or configured to SMF by CP or AS through Network Exposure Function (NEF);
  • NEF Network Exposure Function
  • the CP or AS sends the MBS information to the MBS service control plane functional entity, and the MBS service control plane functional entity configures the information of the MBS session to the SMF.
  • the MBS service control plane function entity may be an MBS function (MBS Function, MBSF) and an MBS service function control entity (MBS Function-Control Plane, MSF-C).
  • SMF information may also include SMF identification information, network slice information served by SMF, DNN, and service area information.
  • the identification information may include SMF ID, SMF FQDN, IP Address, and PLMN ID.
  • the network slice information served by the SMF may include S-NSSAI and NSI, and the service area information may include TAI and TAI List.
  • the NRF matches the MBS information sent by the AMF with the MBS session information in the SMF information, and determines the matching SMF as the first SMF; or,
  • the NRF matches the MBS information, the MBS capability indication information, and the first information sent by the AMF with the SMF information, and determines the matching SMF as the first SMF.
  • NRF obtains the information of the first SMF.
  • the information of the first SMF includes identification information of the SMF, and may also include information of the MBS session currently served by the SMF.
  • the NRF sends the Nnrf_NFDiscovery_Request response containing the information of the first SMF to the AMF.
  • S303b According to the received MBS information and the stored SMF information, when the NRF determines that there is no SMF currently serving the MBS session corresponding to the MBS information, it sends the NRF network function discovery that includes the information of the third SMF with MBS capability to the AMF Request Nnrf_NFDiscovery_Request response.
  • the SMF Before performing step 303b, when the SMF establishes the MBS session, it registers or updates the SMF information with the NRF.
  • the SMF information includes the information of the MBS session; when the SMF releases the MBS session, it requests the NRF to update the SMF information, and the update SMF
  • the information includes: deleting the MBS session information from the SMF information.
  • the NRF When performing step 303b, the NRF needs to filter out all third SMFs with MBS capability from the registered SMFs. Therefore, the number of third SMFs may be one or more.
  • the information of the third SMF includes at least the identification information of the SMF and the information indicating that the SMF has MBS capability.
  • S304a The AMF selects the first SMF.
  • the AMF directly selects the first SMF and performs subsequent operations for the UE to join the MBS session.
  • S304b The AMF selects the third SMF.
  • step 304b if the NRF only provides information about one third SMF, then AMF can directly select the third SMF; if the NRF provides information about multiple third SMFs, AMF can follow the preset local policy Choose a third SMF.
  • the selected third SMF can update information to the NRF, and add the information of the MBS session to the information of the third SMF.
  • the specific adding method has been described above, and will not be repeated here.
  • S305a When determining that the service area of the first SMF includes the area where the UE is located, the AMF sends an SMF multicast/broadcast update session management context request containing MBS information to the first SMF according to the information of the first SMF, or SMF PDU session generation Session management context request.
  • the AMF sends the SMF multicast/broadcast update session management context Nsmf_MBSSession_UpdateSMContext request to the first SMF, or the SMF PDU session generates the session management context Nsmf_PDUSession_CreateSMContext request, and the Nsmf_MBSSession_UpdateSMContext request or the Nsmf_PDUSession_CreateSMContext request carries the UE identification information and MBS information. And other information, request to join the UE to the MBS session.
  • S305b When the AMF determines that the service area of the first SMF does not include the area where the UE is located, the AMF sends an SMF containing the information of the first SMF to the intermediate SMF PDU session generation session management context Nsmf_PDUSession_CreateSMContext request or SMF multicast/broadcast session generation session management Context Nsmf_MBSSession_CreateSMContext request, where the service area of the intermediate SMF includes the area where the UE is located.
  • the Nsmf_PDUSession_CreateSMContext request or Nsmf_MBSSession_CreateSMContext carries the UE's identification information, MBS information and other information to request the UE to be added to the MBS session.
  • the AMF may select an SMF with MBS capability from the locally configured SMFs as the intermediate SMF; it may also query the NRF for the SMF capable of serving the area where the UE is located and with the MBS capability as the intermediate SMF. Then, the intermediate SMF needs to update the information to the NRF, and add the information of the MBS session to the information of the intermediate SMF.
  • the specific adding method has been described above, and will not be repeated here.
  • the intermediate SMF sends an SMF multicast/broadcast update request or an SMF PDU session establishment request containing MBS information to the first SMF according to the information of the first SMF.
  • the intermediate SMF sends an SMF multicast/broadcast update Nsmf_MBSSession_Update request or an SMF PDU session establishment Nsmf_PDUSession_Create request to the first SMF.
  • S305c When the AMF determines that the service area of the third SMF includes the area where the UE is located, the AMF sends the SMF multicast/broadcast update session management context Nsmf_MBSSession_UpdateSMContext request containing the MBS information to the third SMF according to the information of the third SMF, or SMFPDU session Generate session management context Nsmf_PDUSession_CreateSMContext request.
  • S305d When the AMF determines that the service area of the third SMF does not include the area where the UE is located, the AMF sends an SMF containing the information of the first SMF to the intermediate SMF PDU session generation session management context Nsmf_PDUSession_CreateSMContext request or SMF multicast/broadcast session generation session management Context Nsmf_MBSSession_CreateSMContext request, where the service area of the intermediate SMF includes the area where the UE is located.
  • the intermediate SMF sends the SMF multicast/broadcast update Nsmf_MBSSession_Update request or the SMF PDU session establishment Nsmf_PDUSession_Create request containing the MBS information to the third SMF according to the information of the third SMF.
  • the first SMF adds the UE to the MBS session according to the MBS information.
  • the first SMF sends an SM message to the UPF serving the MBS session through the N4 interface.
  • the SM message includes updated MBS related information, and the related information includes but is not limited to MBS QoS flow information, and tunnel information for receiving MBS data ;
  • the first SMF sends an SM message to the RAN through the N2 interface, so that the RAN configures the tunnel for receiving MBS data from the UPF and the radio resources for transmitting MBS data with the UE according to the received SM message;
  • the first SMF through the N1 interface Send an SM message to the UE so that the UE determines to start receiving MBS data according to the SM message.
  • the first SMF After the first SMF releases the MBS session, it needs to update the information to the NRF, and delete the information of the MBS session from the information of the first SMF.
  • S306b The third SMF adds the UE to the MBS session according to the MBS information.
  • the third SMF sends an SM message to the UPF serving the MBS session through the N4 interface.
  • the SM message includes updated MBS-related information, including but not limited to MBS QoS flow information, and tunnel information for receiving MBS data ;
  • the third SMF sends an SM message to the RAN through the N2 interface, so that the RAN configures the tunnel for receiving MBS data from the UPF and the radio resources for transmitting MBS data with the UE according to the received SM message;
  • the third SMF through the N1 interface Send an SM message to the UE so that the UE determines to start receiving MBS data according to the SM message.
  • the third SMF After the third SMF releases the MBS session, it needs to update the information to the NRF, and delete the information of the MBS session from the information of the third SMF.
  • Embodiment 2 When the UE has established a PDU session, the AMF selects the SMF serving the MBS session.
  • FIG. 4 a schematic flowchart of the second embodiment is provided.
  • S401 The UE sends a UL NAS Transport message carrying MBS information to the AMF.
  • the UE can send request information containing MBS information to the AMF in any of the following ways:
  • Method 1 The UE sends an Uplink Non-Access Layer (UL NAS Transport) message to the AMF.
  • UL NAS Transport message carries the MBS information and the SM message.
  • the SM message here includes a PDU session modification request.
  • Method 2 The UE uses the user plane of the established PDU session to send a multicast join message to the UPF.
  • the multicast join message carries MBS information; the UPF then sends a notification to the second SMF serving the PDU session.
  • the identity information and MBS information of the UE are carried in the second SMF; the second SMF initiates the AMF communication rerouting Namf_Communication_Reroute request or the SMFPDU session update Nsmf_PDUSession_Update request to the AMF, and the identity information and MBS information of the UE are carried in the Namf_Communication_Reroute request or the Nsmf_PDUSession_Update request.
  • S402 AMF sends Nnrf_NFDiscovery_Request containing MBS information to NRF.
  • S403a When the NRF determines that there is an SMF currently serving the MBS session corresponding to the MBS information according to the received MBS information and the stored SMF information, it sends an Nnrf_NFDiscovery_Request response containing the information of the first SMF to the AMF.
  • S403b According to the received MBS information and the stored SMF information, when the NRF determines that there is no SMF currently serving the MBS session corresponding to the MBS information, it sends an Nnrf_NFDiscovery_Request response containing the information of the third SMF capable of MBS to the AMF.
  • SMF Before performing step 403a or step 403b, when SMF establishes an MBS session, it registers or updates SMF information with NRF.
  • the SMF information includes information about the MBS session; when SMF releases the MBS session, it requests the NRF to update the SMF information, so
  • the update of the SMF information includes: deleting the MBS session information from the SMF information.
  • S404a The AMF selects the first SMF.
  • S404b AMF selects the third SMF.
  • step 404b if the NRF only provides information about one third SMF, then AMF can directly select the third SMF; if the NRF provides information about multiple third SMFs, AMF can follow the preset local policy Choose a third SMF. If the second SMF serving the PDU session also has MBS capability, the AMF will preferentially select the second SMF.
  • the selected third (or second) SMF may update information to the NRF, and add the information of the MBS session to the information of the third (or second) SMF.
  • S405a When determining that the service area of the first SMF includes the area where the UE is located, the AMF sends an Nsmf_MBSSession_UpdateSMContext request containing MBS information or an Nsmf_PDUSession_CreateSMContext request to the first SMF according to the information of the first SMF, and the second SMF releases the PDU session.
  • AMF sends Nsmf_PDUSession_UpdateSMContext or Nsmf_PDUSession_ReleaseSMContext carrying the PDU session identifier to the second SMF, and transfers all relevant parameters of the PDU session to the first SMF in the second SMF.
  • the second SMF releases the PDU session, that is, the second SMF deletes the context of the PDU session.
  • the first SMF serves both the PDU session and the MBS session.
  • S405b When determining that the service area of the first SMF does not include the area where the UE is located, the AMF sends an Nsmf_PDUSession_CreateSMContext request or Nsmf_MBSSession_CreateSMContext request containing the information of the first SMF to the intermediate SMF, where the service area of the intermediate SMF includes the area where the UE is located.
  • AMF can select an SMF with MBS capability from the locally configured SMFs as the intermediate SMF; it can also query the NRF for SMFs that can serve the area where the UE is located and have MBS capabilities, as the intermediate SMF; it can also be MBS capable
  • the second SMF is used as the intermediate SMF. Then, the intermediate SMF may update the information to the NRF, and add the information of the MBS session to the information of the intermediate SMF.
  • the intermediate SMF sends the Nsmf_MBSSession_Update request or the Nsmf_PDUSession_Create request containing the MBS information to the first SMF according to the information of the first SMF.
  • S405c When determining that the service area of the third SMF includes the area where the UE is located, the AMF sends to the third SMF an Nsmf_MBSSession_UpdateSMContext request containing MBS information or an Nsmf_PDUSession_CreateSMContext request according to the information of the third SMF.
  • S405d When determining that the service area of the third SMF does not include the area where the UE is located, the AMF sends an Nsmf_PDUSession_CreateSMContext request or Nsmf_MBSSession_CreateSMContext request containing the information of the third SMF to the intermediate SMF, where the service area of the intermediate SMF includes the area where the UE is located.
  • the AMF initiates the Nsmf_PDUSession_UpdateSMContext request or the Nsmf_MBSSession_CreateSMContext request to the second SMF.
  • Both of the foregoing two requests carry the UE's identification information, MBS information, and the first SMF. Information and other information.
  • the intermediate SMF sends the Nsmf_MBSSession_Update request or the Nsmf_PDUSession_Create request containing the MBS information to the third SMF according to the information of the third SMF.
  • the second SMF sends the Nsmf_MBSSession_Update request or the Nsmf_PDUSession_Create request to the first SMF, and both of the foregoing two requests carry the UE identification information, MBS information and other information .
  • the first SMF adds the UE to the MBS session according to the MBS information.
  • the third SMF adds the UE to the MBS session according to the MBS information.
  • Embodiment 3 When the UE has established a PDU session, the second SMF selects the SMF serving the MBS session.
  • FIG. 5 a schematic flowchart of the third embodiment is provided.
  • the UE sends MBS information to the second SMF.
  • the UE uses the user plane of the established PDU session to send a multicast join message to the UPF.
  • the multicast join message carries the MBS information; the UPF then sends a notification to the second SMF serving the PDU session, and the notification carries UE identification information and MBS information.
  • the second SMF sends an NRF network function discovery request Nnrf_NFDiscovery_Request containing MBS information to the NRF.
  • S503a According to the received MBS information and the stored SMF information, when the NRF determines that there is an SMF currently serving the MBS session corresponding to the MBS information, it sends the NRF network function discovery request Nnrf_NFDiscovery_Request response containing the information of the first SMF to the second SMF. .
  • NRF determines that there is no SMF currently serving the MBS session corresponding to the MBS information according to the received MBS information and the stored SMF information, it sends the NRF network to the second SMF including the information of the third SMF with MBS capability Function discovery request Nnrf_NFDiscovery_Request response.
  • SMF Before performing step 503a or step 503b, when SMF establishes an MBS session, it registers or updates SMF information with NRF.
  • the SMF information includes information about the MBS session; when SMF releases the MBS session, it requests the NRF to update the SMF information, so
  • the update of the SMF information includes: deleting the MBS session information from the SMF information.
  • S504a The second SMF selects the first SMF.
  • S504b The second SMF selects the third SMF.
  • the second SMF can directly select the third SMF; if the NRF provides information about multiple third SMFs, the second SMF can be based on the preset information. Assume that the local strategy selects a third SMF. If the second SMF has MBS capability, the second SMF preferentially selects itself as the third SMF to serve the MBS session.
  • the selected third SMF may update information to the NRF, and add the information of the MBS session to the information of the third SMF.
  • S505a The second SMF sends the AMF communication rerouting Namf_Communication_Reroute request or the SMF PDU session update Nsmf_PDUSession_Update request containing the information of the first SMF to the AMF.
  • S505b The second SMF sends a Namf_Communication_Reroute request or Nsmf_PDUSession_Update request containing the information of the third SMF to the AMF.
  • the AMF When determining that the service area of the first SMF includes the area where the UE is located, the AMF sends an Nsmf_MBSSession_UpdateSMContext request containing MBS information or an Nsmf_PDUSession_CreateSMContext request to the first SMF according to the information of the first SMF, and the second SMF releases the PDU session.
  • the AMF sends the Nsmf_PDUSession_UpdateSMContext or Nsmf_PDUSession_ReleaseSMContext carrying the PDU session identifier to the second SMF, and transfers all the relevant parameters of the PDU session to the second SMF.
  • the second SMF releases the PDU session, that is, the second SMF deletes the context of the PDU session.
  • the first SMF serves both the PDU session and the MBS session.
  • the AMF When determining that the service area of the first SMF does not include the area where the UE is located, the AMF sends an Nsmf_PDUSession_CreateSMContext request or Nsmf_MBSSession_CreateSMContext request containing the information of the first SMF to the intermediate SMF, where the service area of the intermediate SMF includes the area where the UE is located.
  • AMF can select an SMF with MBS capability from the locally configured SMFs as the intermediate SMF; it can also query the NRF for SMFs that can serve the area where the UE is located and have MBS capabilities, as the intermediate SMF; it can also be MBS capable
  • the second SMF is used as the intermediate SMF. Then, the intermediate SMF may update the information to the NRF, and add the information of the MBS session to the information of the intermediate SMF.
  • the intermediate SMF sends the SMF multicast/broadcast session update Nsmf_MBSSession_Update request or the SMF PDU session generation Nsmf_PDUSession_Create request containing the MBS information to the first SMF according to the information of the first SMF.
  • S506c When determining that the service area of the third SMF includes the area where the UE is located, the AMF sends the SMF multicast/broadcast session update session management context Nsmf_MBSSession_UpdateSMContext request or SMFPDU containing the MBS information to the third SMF according to the information of the third SMF.
  • the session generates a session management context Nsmf_PDUSession_CreateSMContext request.
  • S506d When the AMF determines that the service area of the third SMF does not include the area where the UE is located, it sends the Nsmf_PDUSession_CreateSMContext request containing the information of the third SMF or the SMF multicast/broadcast session generation session management context Nsmf_MBSSession_CreateSMContext request to the intermediate SMF, where the intermediate SMF The service area of includes the area where the UE is located.
  • the intermediate SMF sends the MBS information to the third SMF according to the information of the third SMF.
  • the first SMF adds the UE to the MBS session according to the MBS information.
  • the third SMF adds the UE to the MBS session according to the MBS information.
  • an embodiment of the present application provides a device for joining a multicast broadcast service MBS session, which is applied to a network device. As shown in FIG. 6, it at least includes a receiving unit 601, a query unit 602, and a processing unit 603. Among them,
  • the receiving unit 601 is configured to receive MBS information sent by a user terminal UE;
  • the query unit 602 is configured to determine, according to the MBS information, the information of the first session management function SMF currently serving the MBS session corresponding to the MBS information;
  • the processing unit 603 is configured to send the MBS information to the first SMF according to the information of the first SMF, so that the first SMF adds the UE to the MBS session.
  • the network device is an access and mobility management function AMF;
  • the receiving unit 601 is used to:
  • the network device is the second SMF, where the second SMF is an SMF serving a PDU session of the UE;
  • the receiving unit 601 is used to:
  • the query unit 602 is configured to:
  • the fourth request message further includes first information, and the first information includes part or all of the following information:
  • Network slice information data network name, public land mobile network identification, service area information.
  • the query unit 602 is further configured to:
  • the network device is the AMF
  • the processing unit 603 is used to:
  • the service area of the first SMF includes the area where the UE is located, send the MBS information to the first SMF according to the information of the first SMF; or,
  • the service area of the first SMF does not include the area where the UE is located, the information of the first SMF and the MBS information are sent to the intermediate SMF, so that the intermediate SMF is based on the information of the first SMF , Sending the MBS information to the first SMF, where the service area of the intermediate SMF includes the area where the UE is located.
  • the network device is a second SMF
  • the processing unit 603 is used to:
  • the information of the first SMF and the MBS information are sent to the AMF, so that the AMF sends the MBS information to the first SMF according to the information of the first SMF.
  • the MBS information includes part or all of the following information:
  • MBS multicast address temporary mobile group ID, MBS session ID.
  • an embodiment of the present application provides a device for joining a multicast broadcast service MBS session, which is applied to the network database function NRF. As shown in FIG. 7, it at least includes a receiving unit 701, a query unit 702, and a sending unit 703. in,
  • the receiving unit 701 is configured to receive MBS information sent by a network device
  • the query unit 702 is configured to determine a first SMF according to the MBS information and the stored SMF information, where the first SMF is the SMF currently serving the MBS session corresponding to the MBS information;
  • the sending unit 703 is configured to provide the first SMF information to the network device, so that the network device adds the user terminal UE to the MBS session through the first SMF.
  • the query unit 702 is further configured to:
  • the NRF provides the information of the third SMF capable of MBS to the network device, so that the network device can pass the third SMF Adding the UE to the MBS session.
  • the query unit 702 is further configured to:
  • the NRF receives a fifth request message sent by the first SMF, where the fifth request message is used to register or update information about the first SMF, and the information about the first SMF includes information about the MBS session.
  • an embodiment of the present application provides a device for joining a multicast broadcast service MBS session, which is applied to the session management function SMF. As shown in FIG. 8, it includes at least an update unit 801, wherein:
  • the update unit 801 is configured to register or update the SMF information with the network database function NRF when establishing an MBS session.
  • the SMF information includes information about the MBS session, so that the NRF provides the current service to the network device.
  • the SMF information of the MBS session is configured to register or update the SMF information with the network database function NRF when establishing an MBS session.
  • the updating unit 801 is further configured to:
  • requesting the NRF to update the SMF information includes: deleting the MBS session information from the SMF information.
  • an embodiment of the present application provides an electronic device. As shown in FIG. 9, it includes at least a processor 901 and a memory 902, where the memory 902 stores program code, and when the program code is When the processor executes, the processor 901 is caused to execute the steps of any one of the above methods for joining an MBS session.
  • an embodiment of the present application provides a computer-readable storage medium, which includes program code.
  • the program product runs on an electronic device, the program code is used to cause the electronic device to execute any of the foregoing. Steps of a method of joining an MBS session.
  • various aspects of the service control method provided in this application can also be implemented in the form of a program product, which includes program code.
  • the program product runs on a computer device, the program code is used to make the computer
  • the device executes the steps in the method for joining the MBS session described above in this specification according to various exemplary embodiments of the present application.
  • the program product can adopt any combination of one or more readable media.
  • the readable medium may be a readable signal medium or a readable storage medium.
  • the readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or device, or a combination of any of the above. More specific examples (non-exhaustive list) of readable storage media include: electrical connections with one or more wires, portable disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable Type programmable read only memory (EPROM or flash memory), optical fiber, portable compact disk read only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination of the above.
  • the program product for business control of the embodiment of the present application may adopt a portable compact disk read-only memory (CD-ROM) and include program code, and may be run on a computing device.
  • CD-ROM portable compact disk read-only memory
  • the program product of this application is not limited to this.
  • the readable storage medium can be any tangible medium that contains or stores a program, and the program can be used by or combined with a command execution system, device, or device.
  • the readable signal medium may include a data signal propagated in baseband or as a part of a carrier wave, and readable program code is carried therein. This propagated data signal can take many forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the foregoing.
  • the readable signal medium may also be any readable medium other than a readable storage medium, and the readable medium may send, propagate, or transmit a program for use by or in combination with the command execution system, apparatus, or device.
  • the program code contained on the readable medium can be transmitted by any suitable medium, including but not limited to wireless, wired, optical cable, RF, etc., or any suitable combination of the foregoing.
  • the program code used to perform the operations of this application can be written in any combination of one or more programming languages.
  • Programming languages include object-oriented programming languages—such as Java, C++, etc., as well as conventional procedural programming. Language-such as "C" language or similar programming language.
  • the program code can be executed entirely on the user computing device, partly executed on the user equipment, executed as an independent software package, partly executed on the user computing device and partly executed on the remote computing device, or entirely on the remote computing device or server Executed on.
  • the remote computing device may be connected to a user computing device through any kind of network including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computing device (for example, using an Internet service provider to Connect via the Internet).
  • LAN local area network
  • WAN wide area network

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Abstract

本申请涉及无线通信技术领域，提供一种加入组播广播业务MBS会话的方法及装置，用以解决MBS会话管理复杂，其中，方法包括：网络设备根据UE发送的MBS信息，通过NRF确定当前服务于MBS信息对应的MBS会话的第一SMF的信息，网络设备再根据第一SMF的信息，将MBS信息发送给第一SMF，以使第一SMF将UE加入到MBS会话中。这样，网络设备查询得到当前服务于MBS会话的SMF，使得一个MBS会话只由一个SMF服务，避免出现多个SMF服务于同一个MBS会话的情况，简化了MBS会话管理。

Description

加入组播广播业务MBS会话的方法及装置
相关申请的交叉引用
本申请要求在2020年05月22日提交中国专利局、申请号为202010441153.5、申请名称为“加入组播广播业务MBS会话的方法及装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及无线通信技术领域，提供了一种加入组播广播业务MBS会话的方法及装置。
背景技术
第五代移动通信系统(Fifth Generation Mobile Networks，5G)支持组播广播业务(Multicast Broadcast Service，MBS)，以实现第四版互联网协议(Internet Protocol Version 4，IPv4)/第六版互联网协议(Internet Protocol Version 6，IPv6)多播/广播、网络协议电视(Internet Protocol Television，IPTV)等业务数据的传输，或者优化组通信、物联网(Internet of things，IoT)通信、车联网(Vehicle to Everything，V2X)通信等其它业务的传输效率和网络资源使用效率。为了实现上述功能，5G需要将有MBS需求的用户终端(User Equipment，UE)加入到MBS会话。
根据第三代合作伙伴计划(the third Generation Partner Project，3GPP)的标准，接入与移动性管理功能(Access and Mobility Management Function，AMF)接收UE发送的加入MBS会话的请求消息，为UE选择服务于协议数据单元(Protocol Data Unit，PDU)会话和MBS会话的会话管理功能(Session Management Function，SMF)，这样，UE可以加入到MBS会话中，并通过PDU会话通道接收用户面功能(User Plane Function，UPF)发送的MBS数据。
但采用上述加入MBS会话的方法会产生以下问题：当不同的AMF收到多个UE发送的加入相同的MBS会话的请求消息，可能出现不同的AMF选择不同的SMF，将相应的UE加入到相同的MBS会话中，那么多个SMF服务于同一个MBS会话，导致MBS会话管理复杂，甚至MBS数据无法正常发送给UE。
有鉴于此，本申请实施例提供了一种新的加入MBS会话的方法。
发明内容
本申请实施例提供了一种加入MBS会话的方法及装置，用以解决MBS会话管理复杂的问题。
第一方面，本申请实施例提供了一种加入多播广播业务MBS会话的方法，应用于网络设备，该方法包括：
网络设备接收用户终端UE发送的MBS信息；
所述网络设备根据所述MBS信息，确定当前服务于所述MBS信息对应的MBS会话的第一会话管理功能SMF的信息；
所述网络设备根据所述第一SMF的信息，将所述MBS信息发送给所述第一SMF，以使所述第一SMF将所述UE加入到所述MBS会话中。
可选的，所述网络设备为接入与移动性管理功能AMF；
所述网络设备接收用户终端UE发送的MBS信息，包括：
所述AMF接收所述UE发送的包含所述MBS信息的第一请求消息；或者，
所述AMF接收第二SMF发送的包含所述MBS信息的第二请求消息，其中，所述第二SMF是服务于所述UE的PDU会话的SMF。
可选的，所述网络设备为所述第二SMF，其中，所述第二SMF是服务于所述UE的PDU会话的SMF；
所述网络设备接收用户终端UE发送的MBS信息，包括：
所述第二SMF接收UPF发送的包含所述MBS信息的第三请求消息，其 中，所述第三请求消息由所述UPF基于所述UE通过所述PDU会话发送的所述MBS信息生成的。
可选的，所述网络设备根据所述MBS信息，确定当前服务于所述MBS信息对应的MBS会话的第一会话管理功能SMF，包括：
所述网络设备向所述NRF发送包含所述MBS信息的第四请求消息，以向所述NRF查询当前服务于所述MBS信息对应的MBS会话的第一SMF；
所述网络设备接收所述NRF实体发送的所述第一SMF的信息。
可选的，所述第四请求消息还包括第一信息，第一信息包括以下信息的部分或者全部：
网络切片信息，数据网络名称，公共陆地移动网络标识，服务区域信息。
可选的，若不存在当前服务于所述MBS信息对应的MBS会话的第一SMF，进一步包括：
所述网络设备根据所述NRF提供的第三SMF的信息，将所述MBS信息发送给所述第三SMF，以使所述第三SMF将所述UE加入到所述MBS会话中；所述第三SMF具备MBS能力。
可选的，所述网络设备为所述AMF；
所述网络设备根据所述NRF发送的所述第一SMF的信息，将所述MBS信息发送给所述第一SMF，包括：
若所述第一SMF的服务区域包含所述UE所在的区域，所述AMF根据所述第一SMF的信息，将所述MBS信息发送给所述第一SMF；或者，
若所述第一SMF的服务区域不包含所述UE所在的区域，所述AMF将所述第一SMF的信息和所述MBS信息发送给中间SMF，以使所述中间SMF根据所述第一SMF的信息，将所述MBS信息发送给所述第一SMF，其中，所述中间SMF的服务区域包含所述UE所在的区域。
可选的，所述网络设备为第二SMF；
所述网络设备将所述MBS信息发送给所述第一SMF，包括：
所述第二SMF将所述第一SMF的信息和所述MBS信息发送给所述AMF， 以使所述AMF将所述MBS信息发送给所述第一SMF。
可选的，所述MBS信息包括以下信息的部分或者全部：
MBS组播地址，临时移动组标识，MBS会话标识。
第二方面，本申请实施例还提供了一种加入多播广播业务MBS会话的方法，应用于网络数据库功能NRF，包括：
NRF接收网络设备发送的MBS信息；
所述NRF依据所述MBS信息和存储的SMF的信息，确定所述第一SMF，所述第一SMF是当前服务于所述MBS信息对应的MBS会话的SMF；
所述NRF向所述网络设备提供所述第一SMF的信息，以使所述网络设备通过所述第一SMF将用户终端UE加入到所述MBS会话中。
可选的，进一步包括：
若不存在当前服务于所述MBS信息对应的MBS会话的SMF，则所述NRF将具备MBS能力的第三SMF的信息提供给所述网络设备，以使所述网络设备通过所述第三SMF将所述UE加入到所述MBS会话中。
可选的，在NRF接收网络设备发送的MBS信息之前，进一步包括：
所述NRF接收所述第一SMF发送的第五请求消息，所述第五请求消息用于注册或者更新所述第一SMF的信息，所述第一SMF的信息包括所述MBS会话的信息。
第三方面，本申请实施例还提供了一种加入多播广播业务MBS会话的方法，应用于会话管理功能SMF，包括：
SMF配置或建立MBS会话时，向网络数据库功能NRF注册或者更新所述SMF的信息，所述SMF的信息包括所述MBS会话的信息，以使所述NRF向网络设备提供当前服务于所述MBS会话的所述SMF的信息。
可选的，进一步包括：
所述SMF释放所述MBS会话时，向所述NRF请求更新所述SMF的信息，所述更新所述SMF的信息包括：从所述SMF的信息中删除所述MBS会话的信息。
第四方面，本申请实施例还提供了一种加入多播广播业务MBS会话的装置，应用于网络设备，该装置包括：
接收单元，用于接收用户终端UE发送的MBS信息；
查询单元，用于根据所述MBS信息，确定当前服务于所述MBS信息对应的MBS会话的第一会话管理功能SMF的信息；
处理单元，用于根据所述第一SMF的信息，将所述MBS信息发送给所述第一SMF，以使所述第一SMF将所述UE加入到所述MBS会话中。
可选的，所述网络设备为接入与移动性管理功能AMF；
接收用户终端UE发送的MBS信息，所述接收单元用于：
接收所述UE发送的包含所述MBS信息的第一请求消息；或者，
接收第二SMF发送的包含所述MBS信息的第二请求消息，其中，所述第二SMF是服务于所述UE的PDU会话的SMF。
可选的，所述网络设备为所述第二SMF，其中，所述第二SMF是服务于所述UE的PDU会话的SMF；
接收用户终端UE发送的MBS信息，所述接收单元用于：
接收UPF发送的包含所述MBS信息的第三请求消息，其中，所述第三请求消息由所述UPF基于所述UE通过所述PDU会话发送的所述MBS信息生成的。
可选的，根据所述MBS信息，确定当前服务于所述MBS信息对应的MBS会话的第一会话管理功能SMF，所述查询单元用于：
向所述NRF发送包含所述MBS信息的第四请求消息，以向所述NRF查询当前服务于所述MBS信息对应的MBS会话的第一SMF；
接收所述NRF实体发送的所述第一SMF的信息。
可选的，所述第四请求消息还包括第一信息，第一信息包括以下信息的部分或者全部：
网络切片信息，数据网络名称，公共陆地移动网络标识，服务区域信息。
可选的，若不存在当前服务于所述MBS信息对应的MBS会话的第一SMF， 所述查询单元进一步用于：
向NRF发送包含所述MBS信息的第四请求消息，根据所述NRF提供的第三SMF的信息，将所述MBS信息发送给所述第三SMF，以使所述第三SMF将所述UE加入到所述MBS会话中；所述第三SMF具备MBS能力。
可选的，所述网络设备为所述AMF；
根据所述NRF发送的所述第一SMF的信息，将所述MBS信息发送给所述第一SMF，所述处理单元用于：
若所述第一SMF的服务区域包含所述UE所在的区域，根据所述第一SMF的信息，将所述MBS信息发送给所述第一SMF；或者，
若所述第一SMF的服务区域不包含所述UE所在的区域，将所述第一SMF的信息和所述MBS信息发送给中间SMF，以使所述中间SMF将所述MBS信息发送给所述第一SMF，其中，所述中间SMF的服务区域包含所述UE所在的区域。
可选的，所述网络设备为第二SMF；
将所述MBS信息发送给所述第一SMF，所述处理单元用于：
将所述第一SMF的信息和所述MBS信息发送给所述AMF，以使所述AMF将所述MBS信息发送给所述第一SMF。
可选的，所述MBS信息包括以下信息的部分或者全部：
MBS组播地址，临时移动组标识，MBS会话标识。
第五方面，本申请实施例还提供了一种加入多播广播业务MBS会话的装置，应用于网络数据库功能NRF，包括：
接收单元，用于接收网络设备发送的MBS信息；
查询单元，用于依据所述MBS信息和存储的SMF的信息，确定第一SMF，所述第一SMF是当前服务于所述MBS信息对应的MBS会话的SMF；
发送单元，用于向所述网络设备提供所述第一SMF的信息，以使所述网络设备通过所述第一SMF将用户终端UE加入到所述MBS会话中。
可选的，所述查询单元进一步用于：
若不存在当前服务于所述MBS信息对应的MBS会话的SMF，则所述NRF将具备MBS能力的第三SMF的信息提供给所述网络设备，以使所述网络设备通过所述第三SMF将所述UE加入到所述MBS会话中。
可选的，在NRF接收网络设备发送的MBS信息之前，所述查询单元进一步用于：
所述NRF接收所述第一SMF发送的第五请求消息，所述第五请求消息用于注册或者更新所述第一SMF的信息，所述第一SMF的信息包括所述MBS会话的信息。
第六方面，本申请实施例还提供了一种加入多播广播业务MBS会话的装置，应用于会话管理功能SMF，包括：
更新单元，用于配置或建立MBS会话时，向网络数据库功能NRF注册或者更新所述SMF的信息，所述SMF的信息包括所述MBS会话的信息，以使所述NRF向网络设备提供当前服务于所述MBS会话的所述SMF的信息。
可选的，所述更新单元进一步用于：
释放所述MBS会话时，向所述NRF请求更新所述SMF的信息，所述更新所述SMF的信息包括：从所述SMF的信息中删除所述MBS会话的信息。
第七方面，本申请实施例还提供了一种电子设备，其包括处理器和存储器，其中，所述存储器存储有程序代码，当所述程序代码被所述处理器执行时，使得所述处理器执行上述任意一种加入MBS会话的方法的步骤。
第八方面，本申请实施例还提供了一种计算机可读存储介质，其包括程序代码，当所述程序产品在电子设备上运行时，所述程序代码用于使所述电子设备执行上述任意一种加入MBS会话的方法的步骤。
本申请有益效果如下：
本申请实施例提供的一种加入MBS会话的方法及装置，网络设备根据UE发送的MBS信息，通过NRF确定当前服务于MBS信息对应的MBS会话的第一SMF的信息，网络设备再根据第一SMF的信息，将MBS信息发送给第一SMF，以使第一SMF将UE加入到MBS会话中。这样，网络设备查询 得到当前服务于MBS会话的SMF，使得一个MBS会话只由一个SMF服务，避免出现多个SMF服务于同一个MBS会话的情况，简化了MBS会话管理。
本申请的其它特征和优点将在随后的说明书中阐述，并且，部分地从说明书中变得显而易见，或者通过实施本申请而了解。本申请的目的和其他优点可通过在所写的说明书、权利要求书、以及附图中所特别指出的结构来实现和获得。
附图说明
此处所说明的附图用来提供对本申请的进一步理解，构成本申请的一部分，本申请的示意性实施例及其说明用于解释本申请，并不构成对本申请的不当限定。在附图中：
图1为本申请实施例中移动通信系统的架构示意图；
图2为本申请实施例中加入MBS会话的流程示意图；
图3为本申请实施例中实施例一的流程示意图；
图4为本申请实施例中实施例二的流程示意图；
图5为本申请实施例中实施例三的流程示意图；
图6为本申请实施例提供的应用于网络设备的加入MBS会话的装置的结构示意图；
图7为本申请实施例提供的应用于NRF的加入MBS会话的装置的结构示意图；
图8为本申请实施例提供的应用于SMF的加入MBS会话的装置的结构示意图；
图9为本申请实施例中的一种电子设备的组成结构示意图。
具体实施方式
为使本申请实施例的目的、技术方案和优点更加清楚，下面将结合本申请实施例中的附图，对本申请的技术方案进行清楚、完整地描述，显然，所 描述的实施例是本申请技术方案的一部分实施例，而不是全部的实施例。基于本申请文件中记载的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请技术方案保护的范围。
参阅图1所示，本申请实施例提供了一种移动通信系统，所述系统中至少包括网络设备101、网络数据库功能(Network Repository Function，NRF)102、SMF103、UPF104和无线接入网(Radio Access Network，RAN)105。
所述网络设备101用于接收UE发送的加入MBS的请求消息，根据请求消息中携带的MBS信息，向NRF查询得到当前服务于该MBS信息对应的MBS会话的SMF。
所述NRF102用于根据网络设备101发送的MBS信息，和存储的SMF的信息，确定出当前服务于该MBS信息对应的MBS会话的SMF。
SMF103用于服务UE的PDU会话和MBS会话。具体地，SMF103通过N4接口向服务于该MBS会话的UPF发送会话管理(Session Management，SM)消息，SM消息包括更新后的MBS相关信息，所述相关信息包括但不限于组播/广播业务质量流(MBS Quality of Service flow，MBS QoS flow)信息、接收MBS数据的隧道信息；SMF103通过N2接口向RAN发送SM消息，以使RAN根据接收到的SM消息，配置从UPF接收MBS数据的隧道，以及与UE之间传输MBS数据的无线资源；SMF103通过N1接口向UE发送SM消息，以使UE根据SM消息确定开始接收MBS数据。
参阅图2所示，本申请实施例提供了加入MBS会话的流程示意图。
S201：网络设备接收UE发送的MBS信息。
MBS信息表征UE请求加入的MBS会话的标识信息，本申请实施例中的MBS信息包括以下信息的部分或者全部：
MBS组播地址(MBS Multicast Address)；临时移动组标识(Temporary Move Group ID，TMGI)，所述TMGI包含MBS业务标识；MBS会话标识(MBS Session ID)。
S202：网络设备向NRF发送MBS信息。
S203：NRF接收网络设备发送的MBS信息，依据MBS信息和存储的SMF的信息，确定第一SMF，所述第一SMF是当前服务于该MBS信息对应的MBS会话的SMF。
其中，在执行步骤203之前，SMF建立MBS会话时，向NRF注册或更新SMF的信息，所述SMF的信息包括MBS会话的信息；SMF释放MBS会话时，向NRF请求更新SMF的信息，所述更新SMF的信息包括：从SMF的信息中删除MBS会话的信息。这样，NRF可以根据SMF的信息，确定当前服务于该MBS信息对应的MBS会话的SMF。
MBS会话的信息表征SMF当前服务于该MBS会话的信息，在本申请实施例中，MBS会话的信息可以包括以下信息的部分或者全部：MBS组播地址、TMGI、MBS会话标识。
S204：NRF向网络设备提供第一SMF的信息。
S205：网络设备根据第一SMF的信息，将MBS信息发送给第一SMF，以使第一SMF将UE加入到该MBS会话中。
在本申请实施例中，针对UE发起加入MBS的请求消息时，UE请求建立PDU会话和已建立PDU会话的场景，提供了以下三个实施例，描述UE加入到MBS会话的过程。
实施例一：在UE请求建立PDU会话时，由AMF选择服务于PDU会话和MBS会话的SMF。
参阅图3所示，提供了实施例一的流程示意图。
S301：UE向AMF发送携带有MBS信息的上行非接入层传输消息。
具体地，UE向AMF发送上行非接入层传输(Uplink Non-Access Layer，UL NAS Transport)消息，在UL NAS Transport消息中携带有MBS信息和SM消息。其中，这里的SM消息包括PDU会话建立请求；MBS信息表征UE请求加入的MBS会话的标识信息，MBS信息是由MBS的内容提供者(Content Provider，CP)或者应用服务器(Application Server，AS)提供给UE的，MBS信息可为以下信息的部分或者全部：MBS组播地址、TMGI、MBS会话标识。
S302：AMF向NRF发送包含MBS信息的NRF网络功能发现请求。
具体地，AMF向NRF发起NRF网络功能发现请求Nnrf_NFDiscovery_Request，所述Nnrf_NFDiscovery_Request用于查询当前服务于MBS信息对应的第一SMF。在Nnrf_NFDiscovery_Request中携带了NF类型和UE提供的MBS信息，除此之外，在Nnrf_NFDiscovery_Request中还可以携带MBS能力指示信息和第一信息，其中，MBS能力指示信息用于请求具备MBS能力的SMF，第一信息用于限制所请求的SMF的服务范围。第一信息包括以下信息的部分或者全部：网络切片信息、数据网络名称(Data Network Name，DNN)、公共陆地移动网络标识(Public Land Mobile Network ID，PLMN ID)和服务区域信息。
网络切片信息包括单个网络切片选择辅助信息(A Single Network Slice Selects Auxiliary Information，S-NSSAI)、网络切片实例标识(Network Slice Instance ID，NSI)；服务区域信息包括跟踪区标识(Tracking Area Identifier，TAI)、跟踪区标识列表(TAI List，即多个TAI)。这样，可以保证在上述规定的服务范围内，只有一个SMF用于为特定MBS的MBS会话提供服务，而在服务范围外，可以由其它SMF为特定MBS的MBS会话提供服务，从而避免了一个SMF受限于自身的服务区域或者荷载过大等问题，难以管理所有范围的MBS会话的情况。
S303a：NRF根据接收的MBS信息和存储的SMF的信息，确定存在当前服务于该MBS信息对应的MBS会话的SMF时，向AMF发送包含第一SMF的信息的NRF网络功能发现请求响应。
在执行步骤303a之前，SMF建立MBS会话时，向NRF发起包含注册的SMF的信息的NRF网络功能管理注册Nnrf_NFManagement_NFRegister或者包含更新的SMF的信息的NRF网络功能管理信息更新Nnrf_NFManagement_NFUpdate，所述SMF的信息包括MBS会话的信息；SMF释放MBS会话时，向NRF发起包含更新的SMF的信息的Nnrf_NFManagement_NFUpdate，所述更新SMF的信息包括：从SMF的信息 中删除MBS会话的信息。这样，NRF可以根据SMF的信息，确定当前服务于该MBS信息对应的MBS会话的SMF。SMF可通过以下任意一种方式获取到MBS会话的信息：
(1)由MBS的CP或者AS将MBS信息提供UE，当UE发起加入MBS会话的第一请求消息时，再由UE提供给SMF；
(2)由CP或者AS直接配置SMF，或者由CP或者AS通过网络开放功能(Network Exposure Function，NEF)配置给SMF；
(3)CP或者AS将MBS信息发送给MBS业务控制面功能实体，再由MBS业务控制面功能实体将MBS会话的信息配置给SMF。其中，MBS业务控制面功能实体可为MBS功能(MBS Function，MBSF)、MBS业务功能控制实体(MBS Function-Control Plane，MSF-C)。
除此之外，SMF的信息还可以包括SMF的标识信息、SMF所服务的网络切片信息、DNN、服务区域信息，所述标识信息可包括SMF ID、SMF FQDN、IP Address、PLMN ID，所述SMF所服务的网络切片信息可包括S-NSSAI、NSI，所述服务区域信息可包括TAI、TAI List。
具体地，在执行步骤303a时，NRF将AMF发送的MBS信息，与SMF的信息中的MBS会话的信息进行匹配，将匹配一致的SMF确定为第一SMF；或者，
NRF将AMF发送的MBS信息、MBS能力指示信息和第一信息，与SMF的信息进行匹配，将匹配一致的SMF确定为第一SMF。
其次，NRF获取第一SMF的信息。第一SMF的信息包括SMF的标识信息，还可以包括SMF当前服务的该MBS会话的信息。
最后，NRF向AMF发送包含第一SMF的信息的Nnrf_NFDiscovery_Request响应。
S303b：NRF根据接收的MBS信息和存储的SMF的信息，确定不存在当前服务于该MBS信息对应的MBS会话的SMF时，向AMF发送包含具备MBS能力的第三SMF的信息的NRF网络功能发现请求 Nnrf_NFDiscovery_Request响应。
在执行步骤303b之前，SMF建立MBS会话时，向NRF注册或更新SMF的信息，所述SMF的信息包括MBS会话的信息；SMF释放MBS会话时，向NRF请求更新SMF的信息，所述更新SMF的信息包括：从SMF的信息中删除MBS会话的信息。具体操作方式前面已经描述，在此不再赘述。
在执行步骤303b时，NRF需要从注册的SMF里筛选出所有具备MBS能力的第三SMF，因此第三SMF的数量可能为一个，也可能为多个。第三SMF的信息至少包括SMF的标识信息、表征SMF具备MBS能力的信息。
S304a：AMF选择第一SMF。
当前只存在一个服务于该MBS会话的SMF，因此，AMF直接选择第一SMF，执行后续的UE加入该MBS会话的操作即可。
S304b：AMF选择第三SMF。
在执行步骤304b时，若NRF只提供了一个第三SMF的信息，则AMF直接选择该第三SMF即可；若NRF提供了多个第三SMF的信息，则AMF可以根据预设的本地策略选择一个第三SMF。
然后，被选中的第三SMF可以向NRF更新信息，将该MBS会话的信息添加到该第三SMF的信息中。具体添加方式已在前面描述，在此不再赘述。
S305a：AMF在确定第一SMF的服务区域包含UE所在的区域时，根据第一SMF的信息，向第一SMF发送包含MBS信息的SMF组播/广播更新会话管理上下文请求，或者SMF PDU会话生成会话管理上下文请求。
在步骤305a中，AMF向第一SMF发送SMF组播/广播更新会话管理上下文Nsmf_MBSSession_UpdateSMContext请求，或者SMF PDU会话生成会话管理上下文Nsmf_PDUSession_CreateSMContext请求，在Nsmf_MBSSession_UpdateSMContext请求，或者Nsmf_PDUSession_CreateSMContext请求中携带UE的标识信息、MBS信息和其它信息，请求将UE加入到该MBS会话中。
S305b：AMF在确定第一SMF的服务区域不包含UE所在的区域时，AMF 向中间SMF发送包含第一SMF的信息的SMF PDU会话生成会话管理上下文Nsmf_PDUSession_CreateSMContext请求或者SMF组播/广播会话生成会话管理上下文Nsmf_MBSSession_CreateSMContext请求，其中，中间SMF的服务区域包含UE所在的区域。
当第一SMF的服务区域不包含UE所在的区域时，AMF不能直接接入第一SMF，AMF可以通过具备MBS能力且服务区域包含UE所在区域的SMF，作为中间SMF，将MBS信息传输给第一SMF。在Nsmf_PDUSession_CreateSMContext请求或者Nsmf_MBSSession_CreateSMContext中携带UE的标识信息、MBS信息和其它信息，请求将UE加入到该MBS会话中。
具体地，AMF可以从本地配置的SMF中，选择一个具备MBS能力的SMF作为中间SMF；也可以向NRF查询能够服务于UE所在的区域，且具备MBS能力的SMF，作为中间SMF。然后，中间SMF需要向NRF更新信息，将该MBS会话的信息添加到中间SMF的信息中。具体添加方式已在前面描述，在此不再赘述。
S305b＇：中间SMF根据第一SMF的信息，向第一SMF发送包含MBS信息的SMF组播/广播更新请求或者SMF PDU会话建立请求。
中间SMF向第一SMF发送SMF组播/广播更新Nsmf_MBSSession_Update请求，或者SMF PDU会话建立Nsmf_PDUSession_Create请求。
S305c：AMF在确定第三SMF的服务区域包含UE所在的区域时，根据第三SMF的信息，向第三SMF发送包含MBS信息的SMF组播/广播更新会话管理上下文Nsmf_MBSSession_UpdateSMContext请求，或者SMF PDU会话生成会话管理上下文Nsmf_PDUSession_CreateSMContext请求。
S305d：AMF在确定第三SMF的服务区域不包含UE所在的区域时，AMF向中间SMF发送包含第一SMF的信息的SMF PDU会话生成会话管理上下文Nsmf_PDUSession_CreateSMContext请求或者SMF组播/广播会话生成会话管 理上下文Nsmf_MBSSession_CreateSMContext请求，其中，中间SMF的服务区域包含UE所在的区域。
S305d＇：中间SMF根据第三SMF的信息，向第三SMF发送包含MBS信息的SMF组播/广播更新Nsmf_MBSSession_Update请求或者SMF PDU会话建立Nsmf_PDUSession_Create请求。
S306a：第一SMF根据MBS信息，将UE加入到该MBS会话中。
具体地，第一SMF通过N4接口向服务于该MBS会话的UPF发送SM消息，SM消息包括更新后的MBS相关信息，所述相关信息包括但不限于MBS QoS flow信息、接收MBS数据的隧道信息；第一SMF通过N2接口向RAN发送SM消息，以使RAN根据接收到的SM消息，配置从UPF接收MBS数据的隧道，以及与UE之间传输MBS数据的无线资源；第一SMF通过N1接口向UE发送SM消息，以使UE根据SM消息确定开始接收MBS数据。
当第一SMF释放该MBS会话后，需要向NRF更新信息，将该MBS会话的信息从第一SMF的信息中删除。
S306b：第三SMF根据MBS信息，将UE加入到该MBS会话中。
具体地，第三SMF通过N4接口向服务于该MBS会话的UPF发送SM消息，SM消息包括更新后的MBS相关信息，所述相关信息包括但不限于MBS QoS flow信息、接收MBS数据的隧道信息；第三SMF通过N2接口向RAN发送SM消息，以使RAN根据接收到的SM消息，配置从UPF接收MBS数据的隧道，以及与UE之间传输MBS数据的无线资源；第三SMF通过N1接口向UE发送SM消息，以使UE根据SM消息确定开始接收MBS数据。
当第三SMF释放该MBS会话后，需要向NRF更新信息，将该MBS会话的信息从第三SMF的信息中删除。
实施例二：在UE已建立PDU会话时，由AMF选择服务于MBS会话的SMF。
参阅图4所示，提供了实施例二的流程示意图。
S401：UE向AMF发送携带有MBS信息的UL NAS Transport消息。
UE可通过以下任意一种方式，向AMF发送包含MBS信息的请求信息：
方式一：UE向AMF发送上行非接入层传输(Uplink Non-Access Layer，UL NAS Transport)消息，在UL NAS Transport消息中携带有MBS信息和SM消息，这里的SM消息包括PDU会话修改请求。
方式二：UE利用已建立的PDU会话的用户面，向UPF发送组播加入消息，在该组播加入消息中携带了MBS信息；UPF再向服务于PDU会话的第二SMF发送通知，在通知中携带了UE的标识信息和MBS信息；由第二SMF向AMF发起AMF通信重新路由Namf_Communication_Reroute请求或者SMF PDU会话更新Nsmf_PDUSession_Update请求，在Namf_Communication_Reroute请求或者Nsmf_PDUSession_Update请求中携带了UE的标识信息和MBS信息。
S402：AMF向NRF发送包含MBS信息的Nnrf_NFDiscovery_Request。
S403a：NRF根据接收的MBS信息和存储的SMF的信息，确定存在当前服务于该MBS信息对应的MBS会话的SMF时，向AMF发送包含第一SMF的信息的Nnrf_NFDiscovery_Request响应。
S403b：NRF根据接收的MBS信息和存储的SMF的信息，确定不存在当前服务于该MBS信息对应的MBS会话的SMF时，向AMF发送包含具备MBS能力的第三SMF的信息的Nnrf_NFDiscovery_Request响应。
在执行步骤403a或者步骤403b之前，SMF建立MBS会话时，向NRF注册或更新SMF的信息，所述SMF的信息包括MBS会话的信息；SMF释放MBS会话时，向NRF请求更新SMF的信息，所述更新SMF的信息包括：从SMF的信息中删除MBS会话的信息。具体操作方式前面已经描述，在此不再赘述。
S404a：AMF选择第一SMF。
S404b：AMF选择第三SMF。
在执行步骤404b时，若NRF只提供了一个第三SMF的信息，则AMF直接选择该第三SMF即可；若NRF提供了多个第三SMF的信息，则AMF 可以根据预设的本地策略选择一个第三SMF。若服务于PDU会话的第二SMF也具备MBS能力，AMF会优先选择第二SMF。
然后，被选择的第三(或第二)SMF可以向NRF更新信息，将该MBS会话的信息添加到该第三(或第二)SMF的信息中。
S405a：AMF在确定第一SMF的服务区域包含UE所在的区域时，根据第一SMF的信息，向第一SMF发送包含MBS信息的Nsmf_MBSSession_UpdateSMContext请求，或者Nsmf_PDUSession_CreateSMContext请求，第二SMF释放该PDU会话。
若AMF所选的第一SMF不是服务于PDU会话的第二SMF，AMF向第二SMF发送携带该PDU会话标识的Nsmf_PDUSession_UpdateSMContext或者Nsmf_PDUSession_ReleaseSMContext，在第二SMF将PDU会话的相关参数全部转移到第一SMF后，第二SMF释放该PDU会话，即第二SMF删除该PDU会话的上下文。第一SMF同时服务于PDU会话和该MBS会话。
S405b：AMF在确定第一SMF的服务区域不包含UE所在的区域时，向中间SMF发送包含第一SMF的信息的Nsmf_PDUSession_CreateSMContext请求或者Nsmf_MBSSession_CreateSMContext请求，其中，中间SMF的服务区域包含UE所在的区域。
AMF可以从本地配置的SMF中，选择一个具备MBS能力的SMF作为中间SMF；也可以向NRF查询能够服务于UE所在的区域，且具备MBS能力的SMF，作为中间SMF；还可以将具备MBS能力的第二SMF，作为中间SMF。然后，中间SMF可以向NRF更新信息，将该MBS会话的信息添加到中间SMF的信息中。
S405b＇：中间SMF根据第一SMF的信息，向第一SMF发送包含MBS信息的Nsmf_MBSSession_Update请求或者Nsmf_PDUSession_Create请求。
S405c：AMF在确定第三SMF的服务区域包含UE所在的区域时，根据第三SMF的信息，向第三SMF发送包含MBS信息的Nsmf_MBSSession_UpdateSMContext请求，或者 Nsmf_PDUSession_CreateSMContext请求。
S405d：AMF在确定第三SMF的服务区域不包含UE所在的区域时，向中间SMF发送包含第三SMF的信息的Nsmf_PDUSession_CreateSMContext请求或者Nsmf_MBSSession_CreateSMContext请求，其中，中间SMF的服务区域包含UE所在的区域。
若AMF所选的中间SMF是服务于PDU会话的第二SMF，AMF向第二SMF发起Nsmf_PDUSession_UpdateSMContext请求或者Nsmf_MBSSession_CreateSMContext请求，在前述两个请求中均携带了UE的标识信息、MBS信息、第一SMF的信息和其它信息。
S405d＇：中间SMF根据第三SMF的信息，向第三SMF发送包含MBS信息的Nsmf_MBSSession_Update请求或者Nsmf_PDUSession_Create请求。
若AMF所选的中间SMF是服务于PDU会话的第二SMF，第二SMF向第一SMF发送Nsmf_MBSSession_Update请求或者Nsmf_PDUSession_Create请求，在前述两个请求中均携带了UE的标识信息、MBS信息和其它信息。
S406a：第一SMF根据MBS信息，将UE加入到该MBS会话中。
S406b：第三SMF根据MBS信息，将UE加入到该MBS会话中。
实施例一中已经描述了将UE加入到该MBS会话的过程，在此不再赘述。
实施例三：在UE已建立PDU会话时，由第二SMF选择服务于MBS会话的SMF。
参阅图5所示，提供了实施例三的流程示意图。
S501：UE向第二SMF发送MBS信息。
UE利用已建立的PDU会话的用户面，向UPF发送组播加入消息，在该组播加入消息中携带了MBS信息；UPF再向服务于PDU会话的第二SMF发送通知，在通知中携带了UE的标识信息和MBS信息。
S502：第二SMF向NRF发送包含MBS信息的NRF网络功能发现请求Nnrf_NFDiscovery_Request。
S503a：NRF根据接收的MBS信息和存储的SMF的信息，确定存在当前 服务于该MBS信息对应的MBS会话的SMF时，向第二SMF发送包含第一SMF的信息的NRF网络功能发现请求Nnrf_NFDiscovery_Request响应。
S503b：NRF根据接收的MBS信息和存储的SMF的信息，确定不存在当前服务于该MBS信息对应的MBS会话的SMF时，向第二SMF发送包含具备MBS能力的第三SMF的信息的NRF网络功能发现请求Nnrf_NFDiscovery_Request响应。
在执行步骤503a或者步骤503b之前，SMF建立MBS会话时，向NRF注册或更新SMF的信息，所述SMF的信息包括MBS会话的信息；SMF释放MBS会话时，向NRF请求更新SMF的信息，所述更新SMF的信息包括：从SMF的信息中删除MBS会话的信息。具体操作方式前面已经描述，在此不再赘述。
S504a：第二SMF选择第一SMF。
S504b：第二SMF选择第三SMF。
在执行步骤504b时，若NRF只提供了一个第三SMF的信息，则第二SMF直接选择该第三SMF即可；若NRF提供了多个第三SMF的信息，则第二SMF可以根据预设的本地策略选择一个第三SMF。若第二SMF自身具备MBS能力，第二SMF优先选择自身作为第三SMF，服务于该MBS会话。
然后，被选择的第三SMF可以向NRF更新信息，将该MBS会话的信息添加到该第三SMF的信息中。
S505a：第二SMF向AMF发送包含第一SMF的信息的AMF通信重新路由Namf_Communication_Reroute请求或者SMF PDU会话更新Nsmf_PDUSession_Update请求。
S505b：第二SMF向AMF发送包含第三SMF的信息的Namf_Communication_Reroute请求或者Nsmf_PDUSession_Update请求。
S506a：AMF在确定第一SMF的服务区域包含UE所在的区域时，根据第一SMF的信息，向第一SMF发送包含MBS信息的Nsmf_MBSSession_UpdateSMContext请求，或者 Nsmf_PDUSession_CreateSMContext请求，第二SMF释放该PDU会话。
若第二SMF所选的第一SMF不是服务于PDU会话的第二SMF，AMF向第二SMF发送携带该PDU会话标识的Nsmf_PDUSession_UpdateSMContext或者Nsmf_PDUSession_ReleaseSMContext，在第二SMF将PDU会话的相关参数全部转移到第一SMF后，第二SMF释放该PDU会话，即第二SMF删除该PDU会话的上下文。第一SMF同时服务于PDU会话和该MBS会话。
S506b：AMF在确定第一SMF的服务区域不包含UE所在的区域时，向中间SMF发送包含第一SMF的信息的Nsmf_PDUSession_CreateSMContext请求或者Nsmf_MBSSession_CreateSMContext请求，其中，中间SMF的服务区域包含UE所在的区域。
AMF可以从本地配置的SMF中，选择一个具备MBS能力的SMF作为中间SMF；也可以向NRF查询能够服务于UE所在的区域，且具备MBS能力的SMF，作为中间SMF；还可以将具备MBS能力的第二SMF，作为中间SMF。然后，中间SMF可以向NRF更新信息，将该MBS会话的信息添加到中间SMF的信息中。
S506b＇：中间SMF根据第一SMF的信息，向第一SMF发送包含MBS信息的SMF组播/广播会话更新Nsmf_MBSSession_Update请求或者SMF PDU会话生成Nsmf_PDUSession_Create请求。
S506c：AMF在确定第三SMF的服务区域包含UE所在的区域时，根据第三SMF的信息，向第三SMF发送包含MBS信息的SMF组播/广播会话更新会话管理上下文Nsmf_MBSSession_UpdateSMContext请求，或者SMF PDU会话生成会话管理上下文Nsmf_PDUSession_CreateSMContext请求。
S506d：AMF在确定第三SMF的服务区域不包含UE所在的区域时，向中间SMF发送包含第三SMF的信息的Nsmf_PDUSession_CreateSMContext请求或者SMF组播/广播会话生成会话管理上下文Nsmf_MBSSession_CreateSMContext请求，其中，中间SMF的服务区域包含UE所在的区域。
S506d＇：中间SMF根据第三SMF的信息，将MBS信息发送给第三SMF。
S507a：第一SMF根据MBS信息，将UE加入到该MBS会话中。
S507b：第三SMF根据MBS信息，将UE加入到该MBS会话中。
实施例一中已经描述了将UE加入到该MBS会话的过程，在此不再赘述。
基于同一发明构思，本申请实施例提供了一种加入多播广播业务MBS会话的装置，应用于网络设备，参阅图6所示，至少包括接收单元601、查询单元602和处理单元603，其中，
接收单元601，用于接收用户终端UE发送的MBS信息；
查询单元602，用于根据所述MBS信息，确定当前服务于所述MBS信息对应的MBS会话的第一会话管理功能SMF的信息；
处理单元603，用于根据所述第一SMF的信息，将所述MBS信息发送给所述第一SMF，以使所述第一SMF将所述UE加入到所述MBS会话中。
可选的，所述网络设备为接入与移动性管理功能AMF；
所述接收单元601用于：
接收所述UE发送的包含所述MBS信息的第一请求消息；或者，
接收第二SMF发送的包含所述MBS信息的第二请求消息，其中，所述第二SMF是服务于所述UE的PDU会话的SMF。
可选的，所述网络设备为所述第二SMF，其中，所述第二SMF是服务于所述UE的PDU会话的SMF；
所述接收单元601用于：
接收UPF发送的包含所述MBS信息的第三请求消息，其中，所述第三请求消息由所述UPF基于所述UE通过所述PDU会话发送的所述MBS信息生成的。
可选的，所述查询单元602用于：
向所述NRF发送包含所述MBS信息的第四请求消息，以向所述NRF查询当前服务于所述MBS信息对应的MBS会话的第一SMF；
接收所述NRF实体发送的所述第一SMF的信息。
可选的，所述第四请求消息还包括第一信息，第一信息包括以下信息的部分或者全部：
网络切片信息，数据网络名称，公共陆地移动网络标识，服务区域信息。
可选的，若不存在当前服务于所述MBS信息对应的MBS会话的第一SMF，所述查询单元602进一步用于：
向NRF发送包含所述MBS信息的第四请求消息，根据所述NRF提供的第三SMF的信息，将所述MBS信息发送给所述第三SMF，以使所述第三SMF将所述UE加入到所述MBS会话中；所述第三SMF具备MBS能力。
可选的，所述网络设备为所述AMF；
所述处理单元603用于：
若所述第一SMF的服务区域包含所述UE所在的区域，根据所述第一SMF的信息，将所述MBS信息发送给所述第一SMF；或者，
若所述第一SMF的服务区域不包含所述UE所在的区域，将所述第一SMF的信息和所述MBS信息发送给中间SMF，以使所述中间SMF根据所述第一SMF的信息，将所述MBS信息发送给所述第一SMF，其中，所述中间SMF的服务区域包含所述UE所在的区域。
可选的，所述网络设备为第二SMF；
所述处理单元603用于：
将所述第一SMF的信息和所述MBS信息发送给所述AMF，以使所述AMF根据所述第一SMF的信息，将所述MBS信息发送给所述第一SMF。
可选的，所述MBS信息包括以下信息的部分或者全部：
MBS组播地址，临时移动组标识，MBS会话标识。
基于同一发明构思，本申请实施例提供了一种加入多播广播业务MBS会话的装置，应用于网络数据库功能NRF，参阅图7所示，至少包括接收单元701、查询单元702和发送单元703，其中，
接收单元701，用于接收网络设备发送的MBS信息；
查询单元702，用于依据所述MBS信息和存储的SMF的信息，确定第一 SMF，所述第一SMF是当前服务于所述MBS信息对应的MBS会话的SMF；
发送单元703，用于向所述网络设备提供所述第一SMF的信息，以使所述网络设备通过所述第一SMF将用户终端UE加入到所述MBS会话中。
可选的，所述查询单元702进一步用于：
若不存在当前服务于所述MBS信息对应的MBS会话的SMF，则所述NRF将具备MBS能力的第三SMF的信息提供给所述网络设备，以使所述网络设备通过所述第三SMF将所述UE加入到所述MBS会话中。
可选的，所述查询单元702进一步用于：
所述NRF接收所述第一SMF发送的第五请求消息，所述第五请求消息用于注册或者更新所述第一SMF的信息，所述第一SMF的信息包括所述MBS会话的信息。
基于同一发明构思，本申请实施例提供了一种加入多播广播业务MBS会话的装置，应用于会话管理功能SMF，参阅图8所示，至少包括更新单元801，其中，
更新单元801，用于建立MBS会话时，向网络数据库功能NRF注册或者更新所述SMF的信息，所述SMF的信息包括所述MBS会话的信息，以使所述NRF向网络设备提供当前服务于所述MBS会话的所述SMF的信息。
可选的，所述更新单元801进一步用于：
释放所述MBS会话时，向所述NRF请求更新所述SMF的信息，所述更新所述SMF的信息包括：从所述SMF的信息中删除所述MBS会话的信息。
基于同一发明构思，本申请实施例提供了一种电子设备，参阅图9所示，至少包括处理器901和存储器902，其中，所述存储器902存储有程序代码，当所述程序代码被所述处理器执行时，使得所述处理器901执行上述任意一种加入MBS会话的方法的步骤。
基于同一发明构思，本申请实施例提供了一种计算机可读存储介质，其包括程序代码，当所述程序产品在电子设备上运行时，所述程序代码用于使所述电子设备执行上述任意一种加入MBS会话的方法的步骤。
在一些可能的实施方式中，本申请提供的业务控制方法的各个方面还可以实现为一种程序产品的形式，其包括程序代码，当程序产品在计算机设备上运行时，程序代码用于使计算机设备执行本说明书上述描述的根据本申请各种示例性实施方式的加入MBS会话的方法中的步骤。
程序产品可以采用一个或多个可读介质的任意组合。可读介质可以是可读信号介质或者可读存储介质。可读存储介质例如可以是但不限于电、磁、光、电磁、红外线、或半导体的系统、装置或器件，或者任意以上的组合。可读存储介质的更具体的例子(非穷举的列表)包括：具有一个或多个导线的电连接、便携式盘、硬盘、随机存取存储器(RAM)、只读存储器(ROM)、可擦式可编程只读存储器(EPROM或闪存)、光纤、便携式紧凑盘只读存储器(CD-ROM)、光存储器件、磁存储器件、或者上述的任意合适的组合。
本申请的实施方式的用于业务控制的程序产品可以采用便携式紧凑盘只读存储器(CD-ROM)并包括程序代码，并可以在计算装置上运行。然而，本申请的程序产品不限于此，在本文件中，可读存储介质可以是任何包含或存储程序的有形介质，该程序可以被命令执行系统、装置或者器件使用或者与其结合使用。
可读信号介质可以包括在基带中或者作为载波一部分传播的数据信号，其中承载了可读程序代码。这种传播的数据信号可以采用多种形式，包括但不限于电磁信号、光信号或上述的任意合适的组合。可读信号介质还可以是可读存储介质以外的任何可读介质，该可读介质可以发送、传播或者传输用于由命令执行系统、装置或者器件使用或者与其结合使用的程序。
可读介质上包含的程序代码可以用任何适当的介质传输，包括但不限于无线、有线、光缆、RF等，或者上述的任意合适的组合。
可以以一种或多种程序设计语言的任意组合来编写用于执行本申请操作的程序代码，程序设计语言包括面向对象的程序设计语言—诸如Java、C++等，还包括常规的过程式程序设计语言—诸如“C”语言或类似的程序设计语言。程序代码可以完全地在用户计算装置上执行、部分地在用户设备上执行、作 为一个独立的软件包执行、部分在用户计算装置上部分在远程计算装置上执行、或者完全在远程计算装置或服务器上执行。在涉及远程计算装置的情形中，远程计算装置可以通过任意种类的网络包括局域网(LAN)或广域网(WAN)连接到用户计算装置，或者，可以连接到外部计算装置(例如利用因特网服务提供商来通过因特网连接)。
尽管已描述了本申请的优选实施例，但本领域内的技术人员一旦得知了基本创造性概念，则可对这些实施例做出另外的变更和修改。所以，所附权利要求意欲解释为包括优选实施例以及落入本申请范围的所有变更和修改。
显然，本领域的技术人员可以对本申请进行各种改动和变型而不脱离本申请的精神和范围。这样，倘若本申请的这些修改和变型属于本申请权利要求及其等同技术的范围之内，则本申请也意图包含这些改动和变型在内。

Claims (32)

  1. 一种加入多播广播业务MBS会话的方法，其特征在于，应用于网络设备，该方法包括：
    网络设备接收用户终端UE发送的MBS信息；
    所述网络设备根据所述MBS信息，确定当前服务于所述MBS信息对应的MBS会话的第一会话管理功能SMF的信息；
    所述网络设备根据所述第一SMF的信息，将所述MBS信息发送给所述第一SMF，以使所述第一SMF将所述UE加入到所述MBS会话中。
  2. 如权利要求1所述的方法，其特征在于，所述网络设备为接入与移动性管理功能AMF；
    所述网络设备接收用户终端UE发送的MBS信息，包括：
    所述AMF接收所述UE发送的包含所述MBS信息的第一请求消息；或者，
    所述AMF接收第二SMF发送的包含所述MBS信息的第二请求消息，其中，所述第二SMF是服务于所述UE的PDU会话的SMF。
  3. 如权利要求1所述的方法，其特征在于，所述网络设备为第二SMF，其中，所述第二SMF是服务于所述UE的PDU会话的SMF；
    所述网络设备接收用户终端UE发送的MBS信息，包括：
    所述第二SMF接收所述UE发送的MBS信息；或，
    所述第二SMF接收UPF发送的包含所述MBS信息的第三请求消息，其中，所述第三请求消息由所述UPF基于所述UE通过所述PDU会话发送的所述MBS信息生成的。
  4. 如权利要求1所述的方法，其特征在于，所述网络设备根据所述MBS信息，确定当前服务于所述MBS信息对应的MBS会话的第一会话管理功能SMF，包括：
    所述网络设备向网络数据库功能NRF发送包含所述MBS信息的第四请 求消息，以向所述NRF查询当前服务于所述MBS信息对应的MBS会话的第一SMF；
    所述网络设备接收所述NRF实体发送的所述第一SMF的信息。
  5. 如权利要求4所述的方法，其特征在于，所述第四请求消息还包括第一信息，所述第一信息包括以下信息的部分或者全部：
    网络切片信息，数据网络名称，公共陆地移动网络标识，服务区域信息。
  6. 如权利要求1所述的方法，其特征在于，若不存在当前服务于所述MBS信息对应的MBS会话的第一SMF，进一步包括：
    所述网络设备向NRF发送包含所述MBS信息的第四请求消息，根据所述NRF提供的第三SMF的信息，将所述MBS信息发送给所述第三SMF，以使所述第三SMF将所述UE加入到所述MBS会话中；其中，所述第三SMF具备MBS能力。
  7. 如权利要求1所述的方法，其特征在于，所述网络设备为所述AMF；
    所述网络设备根据所述第一SMF的信息，将所述MBS信息发送给所述第一SMF，包括：
    若所述第一SMF的服务区域包含所述UE所在的区域，所述AMF根据所述第一SMF的信息，将所述MBS信息发送给所述第一SMF；或者，
    若所述第一SMF的服务区域不包含所述UE所在的区域，所述AMF将所述第一SMF的信息和所述MBS信息发送给中间SMF，以使所述中间SMF将所述MBS信息发送给所述第一SMF，其中，所述中间SMF的服务区域包含所述UE所在的区域。
  8. 如权利要求1所述的方法，其特征在于，所述网络设备为第二SMF；
    所述网络设备将所述MBS信息发送给所述第一SMF，包括：
    所述第二SMF将所述第一SMF的信息和所述MBS信息发送给所述AMF，以使所述AMF将所述MBS信息发送给所述第一SMF。
  9. 如权利要求1-8任一项所述的方法，其特征在于，所述MBS信息包括以下信息的部分或者全部：
    MBS组播地址，临时移动组标识，MBS会话标识。
  10. 一种加入多播广播业务MBS会话的方法，其特征在于，应用于网络数据库功能NRF，包括：
    NRF接收网络设备发送的MBS信息；
    所述NRF依据所述MBS信息和存储的SMF的信息，确定第一SMF，所述第一SMF是当前服务于所述MBS信息对应的MBS会话的SMF；
    所述NRF向所述网络设备提供所述第一SMF的信息，以使所述网络设备通过所述第一SMF将用户终端UE加入到所述MBS会话中。
  11. 如权利要求10所述的方法，其特征在于，进一步包括：
    若不存在当前服务于所述MBS信息对应的MBS会话的SMF，则所述NRF将具备MBS能力的第三SMF的信息提供给所述网络设备，以使所述网络设备通过所述第三SMF将所述UE加入到所述MBS会话中。
  12. 如权利要求10所述的方法，其特征在于，在NRF接收网络设备发送的MBS信息之前，进一步包括：
    所述NRF接收所述第一SMF发送的第五请求消息，所述第五请求消息用于注册或者更新所述第一SMF的信息，所述第一SMF的信息包括所述MBS会话的信息。
  13. 一种加入多播广播业务MBS会话的方法，其特征在于，应用于会话管理功能SMF，包括：
    SMF配置或建立MBS会话时，向网络数据库功能NRF注册或者更新所述SMF的信息，所述SMF的信息包括所述MBS会话的信息，以使所述NRF向网络设备提供当前服务于所述MBS会话的所述SMF的信息。
  14. 如权利要求13所述的方法，其特征在于，进一步包括：
    所述SMF释放所述MBS会话时，向所述NRF请求更新所述SMF的信息，所述更新所述SMF的信息包括：从所述SMF的信息中删除所述MBS会话的信息。
  15. 如权利要求13所述的方法，其特征在于，所述MBS会话的信息包 括以下信息的部分或者全部：
    MBS组播地址、临时移动组标识、MBS会话标识。
  16. 一种加入多播广播业务MBS会话的装置，其特征在于，应用于网络设备，该装置包括：
    接收单元，用于接收用户终端UE发送的MBS信息；
    查询单元，用于根据所述MBS信息，确定当前服务于所述MBS信息对应的MBS会话的第一会话管理功能SMF的信息；
    处理单元，用于根据所述第一SMF的信息，将所述MBS信息发送给所述第一SMF，以使所述第一SMF将所述UE加入到所述MBS会话中。
  17. 如权利要求16所述的装置，其特征在于，所述网络设备为接入与移动性管理功能AMF；
    所述接收单元用于：
    接收所述UE发送的包含所述MBS信息的第一请求消息；或者，
    接收第二SMF发送的包含所述MBS信息的第二请求消息，其中，所述第二SMF是服务于所述UE的PDU会话的SMF。
  18. 如权利要求16所述的装置，其特征在于，所述网络设备为所述第二SMF，其中，所述第二SMF是服务于所述UE的PDU会话的SMF；
    所述接收单元用于：
    接收所述UE发送的MBS信息；或，
    接收UPF发送的包含所述MBS信息的第三请求消息，其中，所述第三请求消息由所述UPF基于所述UE通过所述PDU会话发送的所述MBS信息生成的。
  19. 如权利要求16所述的装置，其特征在于，所述查询单元用于：
    向网络数据库功能NRF发送包含所述MBS信息的第四请求消息，以向所述NRF查询当前服务于所述MBS信息对应的MBS会话的第一SMF；
    接收所述NRF实体发送的所述第一SMF的信息。
  20. 如权利要求19所述的装置，其特征在于，所述第四请求消息还包括 第一信息，所述第一信息包括以下信息的部分或者全部：
    网络切片信息，数据网络名称，公共陆地移动网络标识，服务区域信息。
  21. 如权利要求16所述的装置，其特征在于，若不存在当前服务于所述MBS信息对应的MBS会话的第一SMF，所述查询单元进一步用于：
    向NRF发送包含所述MBS信息的第四请求消息，根据所述NRF提供的第三SMF的信息，将所述MBS信息发送给所述第三SMF，以使所述第三SMF将所述UE加入到所述MBS会话中；其中，所述第三SMF具备MBS能力。
  22. 如权利要求16所述的装置，其特征在于，所述网络设备为所述AMF；
    所述处理单元用于：
    若所述第一SMF的服务区域包含UE所在的区域，根据所述第一SMF的信息，将所述MBS信息发送给所述第一SMF；或者，
    若所述第一SMF的服务区域不包含所述UE所在的区域，将所述第一SMF的信息和所述MBS信息发送给中间SMF，以使所述中间SMF将所述MBS信息发送给所述第一SMF，其中，所述中间SMF的服务区域包含所述UE所在的区域。
  23. 如权利要求16所述的装置，其特征在于，所述网络设备为第二SMF；
    所述处理单元用于：
    将所述第一SMF的信息和所述MBS信息发送给所述AMF，以使所述AMF将所述MBS信息发送给所述第一SMF。
  24. 如权利要求16-23任一项所述的装置，其特征在于，所述MBS信息包括以下信息的部分或者全部：
    MBS组播地址，临时移动组标识，MBS会话标识。
  25. 一种加入多播广播业务MBS会话的装置，其特征在于，应用于网络数据库功能NRF，包括：
    接收单元，用于接收网络设备发送的MBS信息；
    查询单元，用于依据所述MBS信息和存储的SMF的信息，确定第一SMF，所述第一SMF是当前服务于所述MBS信息对应的MBS会话的SMF；
    发送单元，用于向所述网络设备提供所述第一SMF的信息，以使所述网络设备通过所述第一SMF将用户终端UE加入到所述MBS会话中。
  26. 如权利要求25所述的装置，其特征在于，所述查询单元进一步用于：
    若不存在当前服务于所述MBS信息对应的MBS会话的SMF，则所述NRF将具备MBS能力的第三SMF的信息提供给所述网络设备，以使所述网络设备通过所述第三SMF将所述UE加入到所述MBS会话中。
  27. 如权利要求25所述的装置，其特征在于，所述查询单元进一步用于：
    所述NRF接收所述第一SMF发送的第五请求消息，所述第五请求消息用于注册或者更新所述第一SMF的信息，所述第一SMF的信息包括所述MBS会话的信息。
  28. 一种加入多播广播业务MBS会话的装置，其特征在于，应用于会话管理功能SMF，包括：
    更新单元，用于配置或建立MBS会话时，向网络数据库功能NRF注册或者更新所述SMF的信息，所述SMF的信息包括所述MBS会话的信息，以使所述NRF向网络设备提供当前服务于所述MBS会话的所述SMF的信息。
  29. 如权利要求28所述的装置，其特征在于，所述更新单元进一步用于：
    释放所述MBS会话时，向所述NRF请求更新所述SMF的信息，所述更新所述SMF的信息包括：从所述SMF的信息中删除所述MBS会话的信息。
  30. 如权利要求28所述的装置，其特征在于，所述MBS会话的信息包括以下信息的部分或者全部：
    MBS组播地址、临时移动组标识、MBS会话标识。
  31. 一种电子设备，其特征在于，其包括处理器和存储器，其中，所述存储器存储有程序代码，当所述程序代码被所述处理器执行时，使得所述处理器执行权利要求1～15中任一所述方法的步骤。
  32. 一种计算机可读存储介质，其特征在于，其包括程序代码，当所述程序产品在电子设备上运行时，所述程序代码用于使所述电子设备执行权利要求1～15中任一所述方法的步骤。
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