WO2023284474A1 - Amf选择方法、设备、装置及存储介质 - Google Patents

Amf选择方法、设备、装置及存储介质 Download PDF

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Publication number
WO2023284474A1
WO2023284474A1 PCT/CN2022/098933 CN2022098933W WO2023284474A1 WO 2023284474 A1 WO2023284474 A1 WO 2023284474A1 CN 2022098933 W CN2022098933 W CN 2022098933W WO 2023284474 A1 WO2023284474 A1 WO 2023284474A1
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WO
WIPO (PCT)
Prior art keywords
indication information
multicast
amf
access network
rrc message
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PCT/CN2022/098933
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English (en)
French (fr)
Inventor
周锐
周叶
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大唐移动通信设备有限公司
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Publication of WO2023284474A1 publication Critical patent/WO2023284474A1/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
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/27—Transitions between radio resource control [RRC] states

Definitions

  • the present application relates to the technical field of wireless communication, and in particular to an AMF selection method, device, device and storage medium.
  • the network element access and mobility management function (Access and Mobility Management Function, AMF) in the core network of the fifth generation mobile communication (the 5th generation mobile communication, 5G) system is responsible for managing the access and mobility of terminals.
  • AMF Access and Mobility Management Function
  • the access network device such as a base station
  • RRC Radio Resource Control
  • a terminal in the RRC idle state enters the RRC connected state to perform non-access stratum (Non-Access Stratum, NAS) multicast broadcast service (Multicast and Broadcast Service, MBS) related signaling process, such as
  • NAS Non-Access Stratum
  • MBS multicast broadcast service
  • the base station selects an AMF network element supporting the MBS function for the terminal to serve the terminal. If the base station selects an AMF network element that does not support the MBS function, the MBS-related non-access stratum signaling process such as joining a multicast session cannot be performed normally, which will cause the terminal to fail to receive the multicast service.
  • embodiments of the present application provide an AMF selection method, device, device, and storage medium.
  • the embodiment of the present application provides an AMF selection method applied to a terminal, including:
  • the RRC message carries multicast indication information
  • the multicast indication information is used to instruct the access network device to select an AMF matching the multicast indication information.
  • the sending the RRC message to the access network device includes:
  • the terminal in the idle state initiates RRC connection establishment at the RRC layer, and sends an RRC message to the access network device.
  • the sending the RRC message to the access network device includes:
  • an RRC message is sent to the access network device.
  • the multicast indication information includes: one or more of indication information for instructing to receive the multicast session service, and a session identifier of the multicast session service to be received.
  • the preset length of the indication information is N bits, where N is a positive integer.
  • the RRC message includes an existing RRC message or a new RRC message.
  • the embodiment of the present application also provides an AMF selection method, which is applied to an access network device, including:
  • the terminal receiving an RRC message sent by the terminal; wherein, the RRC message carries multicast indication information;
  • the multicast indication information select an AMF matching the multicast indication information.
  • the multicast indication information is indication information for instructing to receive a multicast session service
  • select an AMF that matches the multicast indication information include:
  • the indication information select an AMF that supports the multicast session service corresponding to the indication information.
  • the multicast indication information is indication information for instructing to receive the first multicast session service
  • select the multicast indication information to match the multicast indication information AMFs including:
  • the indication information select an AMF that supports the first multicast session service corresponding to the indication information.
  • the multicast indication information is a session identifier of a multicast session service to be received, then according to the multicast indication information, select an AMF that matches the multicast indication information, include:
  • the session identifier of the multicast session service to be received select an AMF that supports the multicast session service corresponding to the session identifier.
  • the multicast indication information is the session identifier of the first multicast session service
  • select an AMF that matches the multicast indication information including :
  • the session identifier of the first multicast session service select an AMF that supports the first multicast session service corresponding to the session identifier.
  • the embodiment of the present application further provides a terminal, including a memory, a transceiver, and a processor, wherein:
  • a memory for storing computer programs; a transceiver for sending and receiving data under the control of the processor; a processor for reading the computer programs in the memory and implementing the AMF described in the first aspect above Steps to choose a method.
  • the embodiment of the present application further provides an access network device, including a memory, a transceiver, and a processor, wherein:
  • a memory for storing computer programs; a transceiver for sending and receiving data under the control of the processor; a processor for reading the computer programs in the memory and implementing the AMF described in the second aspect above Steps to choose a method.
  • the embodiment of the present application also provides an AMF selection device, which is applied to a terminal, including:
  • a determining unit configured to determine the multicast session service to be received
  • a sending unit configured to send an RRC message to an access network device
  • the RRC message carries multicast indication information
  • the multicast indication information is used to instruct the access network device to select an AMF matching the multicast indication information.
  • the embodiment of the present application also provides an AMF selection device, which is applied to access network equipment, including:
  • a receiving unit configured to receive an RRC message sent by the terminal; wherein, the RRC message carries multicast indication information;
  • a selection unit configured to select an AMF matching the multicast indication information according to the multicast indication information.
  • the embodiment of the present application further provides a processor-readable storage medium, the processor-readable storage medium stores a computer program, and the computer program is used to enable the processor to execute the above-mentioned first aspect.
  • the terminal can instruct the access network equipment to select and multicast the terminal through the multicast indication information carried in the RRC message after determining to receive the multicast session service. Indicates the AMF whose information matches, thereby ensuring that the terminal can normally receive the multicast service.
  • FIG. 1 is a schematic diagram of a scene where a base station is connected to an AMF provided by the prior art
  • Fig. 2 is one of the schematic flow charts of the AMF selection method provided by the embodiment of the present application.
  • Fig. 3 is the second schematic flow diagram of the AMF selection method provided by the embodiment of the present application.
  • FIG. 4 is one of the implementation schematic diagrams of the AMF selection process provided by the embodiment of the present application.
  • FIG. 5 is the second implementation schematic diagram of the AMF selection process provided by the embodiment of the present application.
  • FIG. 6 is the third implementation schematic diagram of the AMF selection process provided by the embodiment of the present application.
  • FIG. 7 is a schematic structural diagram of a terminal provided in an embodiment of the present application.
  • FIG. 8 is a schematic structural diagram of an access network device provided by an embodiment of the present application.
  • FIG. 9 is one of the structural schematic diagrams of the AMF selection device provided by the embodiment of the present application.
  • Fig. 10 is the second schematic diagram of the structure of the AMF selection device provided by the embodiment of the present application.
  • NG-RAN NG-Radio Access Network
  • the network element AMF in the 5G core network is responsible for managing terminal access and mobility. After the terminal enters the RRC connection state, the access network device (such as a base station) needs to select an AMF serving the terminal.
  • a base station can be connected to multiple AMFs, and these AMFs may belong to different Public Land Mobile Networks (PLMNs), or may belong to a specific PLMN.
  • PLMNs Public Land Mobile Networks
  • Figure 1 is a schematic diagram of a scenario where a base station is connected to an AMF provided by the prior art, as shown in Figure 1, in this scenario, a base station can be connected to multiple AMFs belonging to the same PLMN, where AMF 1 and AMF 2 support the MBS function , AMF 3 does not support the MBS function.
  • the terminal joins the multicast session (join the multicast session) process
  • the MBS multicast service is only allowed to be received by terminals authorized by the 5G core network. Therefore, before the terminal starts to receive data of a multicast service, the terminal needs to obtain the 5G core network by performing the process of joining a multicast session at the non-access layer. authorization. Usually, the service process of joining a multicast session is initiated when the terminal is in the RRC idle state.
  • the process of joining a multicast session at the non-access layer requires network elements such as AMF with MBS function, session management function (Session Management Function, SMF) and multicast broadcast session management function (Multicast Broadcast SMF, MB-SMF) of the 5G core network participate.
  • AMF Session Management Function
  • SMF Session Management Function
  • MB-SMF Multicast Broadcast SMF
  • the access network device may select a terminal that does not support MBS The functional AMF network element serves the terminal, resulting in failure to receive the multicast service.
  • each embodiment of the present application provides a solution, so that the access network device can select the AMF supporting the MBS function or the AMF supporting a specific multicast service to serve the terminal, so as to ensure normal reception of the multicast service.
  • FIG 2 is one of the flow diagrams of the AMF selection method provided by the embodiment of the present application, the method is applied to the terminal, as shown in Figure 2, the method includes the following steps:
  • Step 200 determine the multicast session service to be received.
  • the to-be-received multicast session service recorded in the embodiment of the present application may refer to any multicast session service, that is, the first multicast session service.
  • the first multicast session service may be a multicast session service that the terminal is interested in, may also be a multicast session service that the terminal needs to receive, or may be a multicast session service that the terminal is receiving, and the specific situation is not limited.
  • Step 201 sending an RRC message to an access network device.
  • the RRC message carries multicast indication information
  • the multicast indication information is used to instruct the access network device to select an AMF matching the multicast indication information.
  • the terminal may send an RRC message to the access network device after determining to receive the multicast session service, the RRC message carries multicast indication information, and the multicast indication information is used to instruct the access network device to select a session corresponding to the multicast indication information.
  • the access network device can select the AMF matching the multicast indication information to serve the terminal after receiving the RRC message carrying the multicast indication information.
  • the terminal may, after determining to receive the multicast session service, instruct the access network device to select an AMF matching the multicast indication information for the terminal through the multicast indication information carried in the RRC message, Therefore, it is ensured that the terminal can normally receive the multicast service.
  • the sending the RRC message to the access network device includes:
  • the terminal in the idle state initiates RRC connection establishment at the RRC layer, and sends an RRC message to the access network device.
  • the process of joining a multicast session is usually initiated when the terminal is in the RRC idle state, and the process of joining the multicast session is performed after entering the RRC connected state.
  • the terminal sends an RRC message to the access network device.
  • the terminal in the idle state initiates RRC connection establishment at the RRC layer, and sends an RRC message carrying multicast indication information to the access network device.
  • the sending the RRC message to the access network device includes:
  • an RRC message is sent to the access network device.
  • the terminal may send the RRC message carrying the multicast indication information to the access network device during the process of establishing the RRC connection or after the establishment of the RRC connection is completed.
  • the multicast indication information includes: one or more of indication information for instructing to receive the multicast session service, and a session identifier of the multicast session service to be received.
  • the multicast indication information carried in the RRC message sent by the terminal to the access network device may be indication information for instructing to receive the multicast session service, or may be a session identifier of the multicast session service to be received.
  • the indication information for instructing to receive the multicast session service may be an MBS indication or a multicast indication, and the indication information may indicate to the access network device that the terminal needs to receive the multicast service, so that the access network device obtains the After the indication information, the AMF supporting the multicast session service corresponding to the indication information may be selected to serve the terminal.
  • the multicast indication information includes: one or more of indication information for indicating reception of the first multicast session service, and a session identifier of the first multicast session service.
  • the preset length of the indication information used to indicate the reception of the multicast session service may be N bits, where N is a positive integer.
  • the terminal can include a 1-bit multicast indication (Multicast-Indication) in the MSG5 (RRCSetupComplete, RRC establishment complete) message, as follows:
  • the session identifier of the multicast session service to be received may be an MBS session identifier or a multicast session identifier, and the session identifier of the multicast session service to be received is used to indicate to the access network device the multicast session to be joined by the terminal , so that after the access network device obtains the session identifier of the multicast session service to be received, it can select an AMF that supports the multicast session service corresponding to the session identifier to serve the terminal.
  • the session identifier of the multicast service is called Temporary Mobile Group Identity (TMGI)
  • TMGI Temporary Mobile Group Identity
  • the terminal can include the MBS session ID (MBS session ID) in the MSG5 message, as follows:
  • the terminal can carry different multicast indication information in the RRC message, so that the access network device can flexibly select the AMF matching the multicast indication information to serve the terminal.
  • the RRC message carrying the above multicast indication information may include an existing RRC message or a newly added RRC message.
  • the existing RRC message is the existing RRC message
  • the newly added RRC message is the newly defined new RRC message which is different from the existing RRC message.
  • the above RRC message may be sent by the terminal to the access network device during the establishment of the RRC connection, or may be sent by the terminal to the access network device after the RRC establishment is completed.
  • the existing RRC message sent to the access network device may include an RRCSetupRequest (RRC establishment request) message, namely MSG3 message, or an RRCSetupComplete message, namely MSG5 message.
  • the terminal can carry the multicast indication information through different RRC messages, thereby improving the flexibility of the terminal to send the multicast indication information to the access network device.
  • Fig. 3 is the second schematic flow diagram of the AMF selection method provided by the embodiment of the present application.
  • the method is applied to an access network device (such as a base station).
  • the method includes the following steps:
  • Step 300 receiving an RRC message sent by the terminal; wherein, the RRC message carries multicast indication information;
  • Step 301 According to the multicast indication information, select an AMF matching the multicast indication information.
  • the terminal may send an RRC message to the access network device after determining to receive the multicast session service, and the RRC message carries multicast indication information.
  • the access network device After the access network device receives the RRC message carrying the multicast indication information sent by the terminal, it can select the AMF that matches the multicast indication information to serve the terminal, thereby preventing the access network device from selecting an AMF that does not support the MBS function for the terminal.
  • the AMF network element of the AMF network element so that the terminal cannot receive the multicast service normally.
  • the access network device may receive the RRC message carrying the multicast indication information sent by the terminal after determining to receive the multicast session service, and select the AMF matching the multicast indication information as Terminal services, thus ensuring that the terminal can receive multicast services normally.
  • selecting an AMF that matches the multicast indication information includes:
  • an AMF supporting the multicast session service corresponding to the indication information is selected.
  • the multicast indication information carried in the RRC message sent by the terminal to the access network device may be indication information for instructing to receive a multicast session service, and the indication information may be an MBS indication or a multicast indication.
  • the indication information may indicate to the access network device that the terminal needs to receive the multicast service, and after receiving the RRC message carrying the indication information, the access network device may select an AMF that supports the multicast session service corresponding to the indication information according to the indication information Serves the terminal.
  • selecting an AMF that matches the multicast indication information includes:
  • an AMF supporting the first multicast session service corresponding to the indication information is selected.
  • the multicast indication information is the session identifier of the multicast session service to be received, then according to the multicast indication information, select the AMF that matches the multicast indication information, including:
  • an AMF supporting the multicast session service corresponding to the session identifier is selected.
  • the multicast indication information carried in the RRC message sent by the terminal to the access network device may be a session identifier of a multicast session service to be received, and the session identifier of the multicast session service to be received may be an MBS session identifier, It can also be a multicast session identifier.
  • the session identifier of the multicast session service to be received is used to indicate to the access network device the multicast session to be joined by the terminal. After the access network device receives the RRC message carrying the session identifier , the AMF that supports the multicast session service corresponding to the session identifier can be selected to serve the terminal.
  • selecting an AMF that matches the multicast indication information includes:
  • an AMF supporting the first multicast session service corresponding to the session identifier is selected.
  • the access network device can flexibly select the AMF that matches the multicast indication information to serve the terminal according to the different multicast indication information carried by the terminal in the RRC message, ensuring that the terminal can Receive multicast services normally.
  • FIG 4 is one of the implementation schematic diagrams of the AMF selection process provided by the embodiment of the present application.
  • the terminal can include multicast indication information in the MSG5 message to assist the base station to perform AMF selection.
  • the process includes the following steps:
  • Step 400 the non-access layer of the terminal in the idle state initiates the process of joining the multicast session.
  • Step 401 the RRC layer of the terminal in the idle state initiates the RRC connection establishment process, and the terminal sends the MSG5 to the base station, that is, the RRCSetupComplete message, carrying multicast indication information, wherein the multicast indication information may be indication information for instructing to receive multicast session services, It can also be the session ID of the multicast session service to be received.
  • the base station that is, the RRCSetupComplete message
  • the multicast indication information may be indication information for instructing to receive multicast session services, It can also be the session ID of the multicast session service to be received.
  • Step 402 After the RRC connection is established, the base station selects an AMF supporting the MBS function or an AMF supporting a specific multicast service according to the content of the previously received multicast indication information.
  • the base station forwards the MBS-related control signaling Initial UE message (initial terminal message, such as a request message to join a multicast session) from the non-access stratum of the terminal to the AMF selected in step 402.
  • Initial UE message initial terminal message, such as a request message to join a multicast session
  • FIG 5 is the second implementation schematic diagram of the AMF selection process provided by the embodiment of the present application.
  • the terminal can include multicast indication information in the MSG3 message to assist the base station in AMF selection, and the process includes the following steps:
  • Step 500 the non-access layer of the terminal in the idle state initiates a process of joining a multicast session.
  • Step 501 the RRC layer of the terminal in the idle state initiates the RRC connection establishment process, and the terminal sends the MSG3 to the base station, that is, the RRCSetupRequest message, which carries multicast indication information, wherein the multicast indication information may be indication information for instructing to receive multicast session services, It can also be the session ID of the multicast session service to be received.
  • Step 502 After the RRC connection is established, the base station selects an AMF supporting the MBS function or an AMF supporting a specific multicast service according to the content of the previously received multicast indication information.
  • Step 503 the base station forwards the MBS-related control signaling Initial UE message (initial terminal message, such as: joining a multicast session request message) from the non-access stratum of the terminal to the AMF selected in step 502.
  • Initial UE message initial terminal message, such as: joining a multicast session request message
  • FIG 6 is the third schematic diagram of the implementation of the AMF selection process provided by the embodiment of the present application.
  • the terminal can include multicast indication information in the newly defined new RRC message to assist the base station in AMF selection.
  • the process includes the following step:
  • Step 600 the non-access layer of the idle state terminal initiates a process of joining a multicast session.
  • Step 601 the RRC layer of the terminal in the idle state initiates the RRC connection establishment process.
  • the terminal sends a new RRC message to the base station, which carries multicast indication information, wherein the multicast indication information can be used
  • the indication information for instructing to receive the multicast session service may also be the session identifier of the multicast session service to be received.
  • Step 602 the base station triggers AMF selection, and selects an AMF supporting the MBS function or an AMF supporting a specific multicast service according to the content of the previously received multicast indication information.
  • Step 603 the base station forwards the MBS-related control signaling Initial UE message (initial terminal message, such as: join multicast session request message) from the non-access stratum of the terminal to the AMF selected in step 602.
  • Initial UE message initial terminal message, such as: join multicast session request message
  • FIG. 7 is a schematic structural diagram of a terminal provided by an embodiment of the present application.
  • the terminal includes a memory 720, a transceiver 710, and a processor 700; wherein, the processor 700 and the memory 720 may also be arranged physically separately.
  • the memory 720 is used to store computer programs; the transceiver 710 is used to send and receive data under the control of the processor 700 .
  • the transceiver 710 is used to receive and transmit data under the control of the processor 700 .
  • the bus architecture may include any number of interconnected buses and bridges, specifically one or more processors represented by the processor 700 and various circuits of the memory represented by the memory 720 are linked together.
  • the bus architecture can also link together various other circuits such as peripherals, voltage regulators, and power management circuits, etc., which are well known in the art and therefore will not be further described in this application.
  • the bus interface provides the interface.
  • Transceiver 710 may be a plurality of elements, including a transmitter and a receiver, providing a unit for communicating with various other devices over transmission media, including wireless channels, wired channels, optical cables, and other transmission media.
  • the user interface 730 may also be an interface capable of connecting externally and internally to required equipment, and the connected equipment includes but not limited to a keypad, a display, a speaker, a microphone, a joystick, and the like.
  • the processor 700 is responsible for managing the bus architecture and general processing, and the memory 720 can store data used by the processor 700 when performing operations.
  • the processor 700 can be a central processing unit (Central Processing Unit, CPU), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), a field programmable gate array (Field-Programmable Gate Array, FPGA) or a complex programmable logic device (Complex Programmable Logic Device, CPLD), the processor can also adopt a multi-core architecture.
  • CPU Central Processing Unit
  • ASIC Application Specific Integrated Circuit
  • FPGA Field-Programmable Gate Array
  • CPLD Complex Programmable Logic Device
  • the processor 700 calls the computer program stored in the memory 720 to execute any of the methods provided in the embodiments of the present application according to the obtained executable instructions, for example: determining the multicast session service to be received; sending an RRC to the access network device message; wherein, the RRC message carries multicast indication information, and the multicast indication information is used to instruct the access network device to select an AMF matching the multicast indication information.
  • the method includes:
  • the RRC message carries multicast indication information
  • the multicast indication information is used to instruct the access network device to select an AMF matching the multicast indication information.
  • sending the RRC message to the access network device includes: the terminal in the idle state initiates RRC connection establishment at the RRC layer, and sends the RRC message to the access network device.
  • sending the RRC message to the access network device includes: sending the RRC message to the access network device during the establishment of the RRC connection or after the RRC connection is established.
  • the multicast indication information includes: one or more of indication information for instructing to receive the multicast session service, and a session identifier of the multicast session service to be received.
  • the multicast indication information includes: one or more of indication information for indicating reception of the first multicast session service, and a session identifier of the first multicast session service.
  • the preset length of the indication information is N bits, where N is a positive integer.
  • the RRC message includes an existing RRC message or a new RRC message.
  • FIG. 8 is a schematic structural diagram of an access network device provided by an embodiment of the present application. As shown in FIG. 8 , the access network device includes a memory 820, a transceiver 810, and a processor 800; physically separated.
  • the memory 820 is used to store computer programs; the transceiver 810 is used to send and receive data under the control of the processor 800 .
  • the transceiver 810 is used to receive and transmit data under the control of the processor 800 .
  • the bus architecture may include any number of interconnected buses and bridges, specifically one or more processors represented by the processor 800 and various circuits of the memory represented by the memory 820 are linked together.
  • the bus architecture can also link together various other circuits such as peripherals, voltage regulators, and power management circuits, etc., which are well known in the art and therefore will not be further described in this application.
  • the bus interface provides the interface.
  • Transceiver 810 may be a plurality of elements, including a transmitter and a receiver, providing a unit for communicating with various other devices over transmission media, including wireless channels, wired channels, optical cables, and other transmission media.
  • the processor 800 is responsible for managing the bus architecture and general processing, and the memory 820 can store data used by the processor 800 when performing operations.
  • the processor 800 may be a CPU, ASIC, FPGA or CPLD, and the processor may also adopt a multi-core architecture.
  • the processor 800 calls the computer program stored in the memory 820 to execute any of the methods provided in the embodiments of the present application according to the obtained executable instructions, for example: receiving an RRC message sent by the terminal; wherein, the RRC message carries a multicast indication information; according to the multicast indication information, select an AMF matching the multicast indication information.
  • selecting an AMF that matches the multicast indication information according to the multicast indication information includes: according to the indication information , select the AMF that supports the multicast session service corresponding to the indication information.
  • selecting an AMF that matches the multicast indication information includes:
  • an AMF supporting the first multicast session service corresponding to the indication information is selected.
  • selecting an AMF that matches the multicast indication information includes: For the session ID of the multicast session service, select the AMF that supports the multicast session service corresponding to the session ID.
  • selecting an AMF that matches the multicast indication information includes:
  • an AMF supporting the first multicast session service corresponding to the session identifier is selected.
  • the above-mentioned terminal and access network device provided by the embodiment of the present application can implement all the method steps implemented by the above-mentioned method embodiment, and can achieve the same technical effect.
  • the same parts and beneficial effects as those of the method embodiment will be described in detail.
  • FIG. 9 is one of the structural schematic diagrams of the AMF selection device provided in the embodiment of the present application.
  • the device is applied to a terminal. As shown in FIG. 9 , the device includes:
  • a determining unit 900 configured to determine the multicast session service to be received
  • a sending unit 910 configured to send an RRC message to an access network device
  • the RRC message carries multicast indication information
  • the multicast indication information is used to instruct the access network device to select an AMF matching the multicast indication information.
  • the device includes:
  • a determining unit 900 configured to determine a first multicast session service
  • a sending unit 910 configured to send an RRC message to an access network device
  • the RRC message carries multicast indication information
  • the multicast indication information is used to instruct the access network device to select an AMF matching the multicast indication information.
  • sending the RRC message to the access network device includes: the terminal in the idle state initiates RRC connection establishment at the RRC layer, and sends the RRC message to the access network device.
  • sending the RRC message to the access network device includes: sending the RRC message to the access network device during the establishment of the RRC connection or after the RRC connection is established.
  • the multicast indication information includes: one or more of indication information for instructing to receive the multicast session service, and a session identifier of the multicast session service to be received.
  • the multicast indication information includes: one or more of indication information for indicating reception of the first multicast session service, and a session identifier of the first multicast session service.
  • the preset length of the indication information is N bits, where N is a positive integer.
  • the RRC message includes an existing RRC message or a new RRC message.
  • FIG. 10 is the second structural schematic diagram of the AMF selection device provided by the embodiment of the present application.
  • the device is applied to access network equipment. As shown in FIG. 10 , the device includes:
  • the receiving unit 1000 is configured to receive an RRC message sent by the terminal; wherein, the RRC message carries multicast indication information;
  • the selection unit 1010 is configured to select an AMF matching the multicast indication information according to the multicast indication information.
  • selecting an AMF that matches the multicast indication information includes: indication information, select the AMF that supports the multicast session service corresponding to the indication information.
  • selecting an AMF that matches the multicast indication information includes:
  • an AMF supporting the first multicast session service corresponding to the indication information is selected.
  • selecting an AMF that matches the multicast indication information includes: The received session identifier of the multicast session service selects an AMF that supports the multicast session service corresponding to the session identifier.
  • selecting an AMF that matches the multicast indication information includes:
  • an AMF supporting the first multicast session service corresponding to the session identifier is selected.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, each unit may exist separately physically, or two or more units may be integrated into one unit.
  • the above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units.
  • the integrated unit is implemented in the form of a software function unit and sold or used as an independent product, it can be stored in a processor-readable storage medium.
  • the technical solution of the present application is essentially or part of the contribution to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium , including several instructions to make a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (processor) execute all or part of the steps of the methods described in the various embodiments of the present application.
  • the aforementioned storage media include: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disc and other media that can store program codes. .
  • the embodiments of the present application also provide a processor-readable storage medium, the processor-readable storage medium stores a computer program, and the computer program is used to make the processor execute the above-mentioned embodiments.
  • the AMF selection method includes: determining the multicast session service to be received; sending an RRC message to the access network device; wherein, the RRC message carries multicast indication information, and the multicast indication information is used to indicate the access network equipment selection and multicast indication The information matches the AMF.
  • the embodiments of the present application also provide a processor-readable storage medium, the processor-readable storage medium stores a computer program, and the computer program is used to make the processor execute the above-mentioned embodiments.
  • the method for selecting an AMF includes: receiving an RRC message sent by a terminal; wherein, the RRC message carries multicast indication information; and selecting an AMF matching the multicast indication information according to the multicast indication information.
  • the processor-readable storage medium can be any available medium or data storage device that can be accessed by a processor, including but not limited to magnetic storage (e.g., floppy disk, hard disk, magnetic tape, magneto-optical disk (MO), etc.), optical storage (e.g., CD, DVD, BD, HVD, etc.), and semiconductor memory (such as ROM, EPROM, EEPROM, non-volatile memory (NAND FLASH), solid-state drive (SSD)), etc.
  • magnetic storage e.g., floppy disk, hard disk, magnetic tape, magneto-optical disk (MO), etc.
  • optical storage e.g., CD, DVD, BD, HVD, etc.
  • semiconductor memory such as ROM, EPROM, EEPROM, non-volatile memory (NAND FLASH), solid-state drive (SSD)
  • the applicable system may be a global system of mobile communication (GSM) system, a code division multiple access (CDMA) system, a wideband code division multiple access (WCDMA) general packet Wireless business (general packet radio service, GPRS) system, long term evolution (long term evolution, LTE) system, LTE frequency division duplex (frequency division duplex, FDD) system, LTE time division duplex (time division duplex, TDD) system, Long term evolution advanced (LTE-A) system, universal mobile telecommunications system (UMTS), worldwide interoperability for microwave access (WiMAX) system, 5G new air interface (New Radio, NR) system, etc.
  • GSM global system of mobile communication
  • CDMA code division multiple access
  • WCDMA wideband code division multiple access
  • GPRS general packet Wireless business
  • long term evolution long term evolution
  • LTE long term evolution
  • LTE frequency division duplex frequency division duplex
  • TDD time division duplex
  • LTE-A Long term evolution advanced
  • UMTS universal mobile telecommunications
  • the terminal involved in this embodiment of the present application may be a device that provides voice and/or data connectivity to users, a handheld device with a wireless connection function, or other processing devices connected to a wireless modem.
  • the name of the terminal may be different.
  • the terminal may be called a user equipment (User Equipment, UE).
  • UE User Equipment
  • the wireless terminal equipment can communicate with one or more core networks (Core Network, CN) via the radio access network (Radio Access Network, RAN), and the wireless terminal equipment can be a mobile terminal equipment, such as a mobile phone (or called a "cellular "telephones) and computers with mobile terminal equipment, such as portable, pocket, hand-held, computer built-in or vehicle-mounted mobile devices, which exchange language and/or data with the radio access network.
  • a mobile terminal equipment such as a mobile phone (or called a "cellular "telephones) and computers with mobile terminal equipment, such as portable, pocket, hand-held, computer built-in or vehicle-mounted mobile devices, which exchange language and/or data with the radio access network.
  • PCS Personal Communication Service
  • SIP Session Initiated Protocol
  • WLL Wireless Local Loop
  • PDA Personal Digital Assistant
  • Wireless terminal equipment can also be called system, subscriber unit, subscriber station, mobile station, mobile station, remote station, access point , remote terminal (remote terminal), access terminal (access terminal), user terminal (user terminal), user agent (user agent), and user device (user device), which are not limited in this embodiment of the application.
  • the access network device involved in this embodiment of the present application may be a base station, and the base station may include multiple cells that provide services for terminals.
  • the base station can also be called an access point, or it can be a device in the access network that communicates with the wireless terminal device through one or more sectors on the air interface, or other names.
  • the access network device can be used to exchange received air frames with Internet Protocol (Internet Protocol, IP) packets, and act as a router between the wireless terminal device and the rest of the access network, wherein the rest of the access network can Includes Internet Protocol (IP) communications networks.
  • IP Internet Protocol
  • Access network devices may also coordinate attribute management for the air interface.
  • the access network device involved in the embodiment of the present application may be a network device (Base Transceiver Station) in Global System for Mobile communications (GSM) or Code Division Multiple Access (CDMA).
  • BTS Global System for Mobile communications
  • BTS can also be a network device (NodeB) in Wide-band Code Division Multiple Access (WCDMA), or it can be an evolved type in a long term evolution (long term evolution, LTE) system Network equipment (evolutional Node B, eNB or e-NodeB), 5G base station (gNB) in the 5G network architecture (next generation system), or home evolved base station (Home evolved Node B, HeNB), relay node (relay node), home base station (femto), pico base station (pico), etc., are not limited in this embodiment of the present application.
  • GSM Global System for Mobile communications
  • CDMA Code Division Multiple Access
  • BTS Global System for Mobile communications
  • NodeB Wide-band Code Division Multiple Access
  • WCDMA Wide-band Code Division Multiple Access
  • MIMO transmission can be single user MIMO (Single User MIMO, SU-MIMO) or multi-user MIMO (Multiple User MIMO, MU-MIMO).
  • MIMO transmission can be 2D-MIMO, 3D-MIMO, FD-MIMO, or massive-MIMO, or diversity transmission, precoding transmission, or beamforming transmission, etc.
  • the embodiments of the present application may be provided as methods, systems, or computer program products. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) having computer-usable program code embodied therein.
  • processor-executable instructions may also be stored in a processor-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, such that the instructions stored in the processor-readable memory produce a manufacturing product, the instruction device realizes the functions specified in one or more procedures of the flow chart and/or one or more blocks of the block diagram.
  • processor-executable instructions can also be loaded onto a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented
  • the executed instructions provide steps for implementing the functions specified in the procedure or procedures of the flowchart and/or the block or blocks of the block diagrams.

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Abstract

本申请实施例提供一种AMF选择方法、设备、装置及存储介质，其中该方法应用于终端，包括：确定第一多播会话业务；向接入网设备发送RRC消息；其中，所述RRC消息携带有多播指示信息，所述多播指示信息用于指示所述接入网设备选择与所述多播指示信息匹配的AMF。通过本申请实施例提供的AMF选择方法、设备、装置及存储介质，终端可以在确定第一多播会话业务后，通过RRC消息中携带的多播指示信息指示接入网设备为终端选择与多播指示信息相匹配的AMF，从而保证了终端能够正常接收多播业务。

Description

AMF选择方法、设备、装置及存储介质
相关申请的交叉引用
本申请要求于2021年07月14日提交的申请号为202110797400X，发明名称为“AMF选择方法、设备、装置及存储介质”的中国专利申请的优先权，其通过引用方式全部并入本文。
技术领域
本申请涉及无线通信技术领域，尤其涉及一种AMF选择方法、设备、装置及存储介质。
背景技术
第五代移动通信(the 5th generation mobile communication，5G)***核心网中的网元接入和移动性管理功能(Access and Mobility Management Function，AMF)负责对终端的接入和移动性进行管理。当终端进入无线资源控制(Radio Resource Control，RRC)连接态后，接入网设备(例如基站)需要选择一个为终端服务的AMF。
现有技术下，处于RRC空闲态下的终端在进入RRC连接态以执行非接入层(Non-Access Stratum，NAS)的多播广播业务(Multicast and Broadcast Service，MBS)相关信令流程，如加入多播会话过程时，无法保证基站为该终端选择一个支持MBS功能的AMF网元为终端服务。如果基站选择的是不支持MBS功能的AMF网元，则MBS相关的非接入层信令过程如加入多播会话过程无法正常进行，将导致终端无法接收该多播业务。
发明内容
针对现有技术存在的问题，本申请实施例提供一种AMF选择方法、设备、装置及存储介质。
第一方面，本申请实施例提供一种AMF选择方法，应用于终端，包括：
确定待接收多播会话业务；
向接入网设备发送RRC消息；
其中，所述RRC消息携带有多播指示信息，所述多播指示信息用于指示所述接入网设备选择与所述多播指示信息匹配的AMF。
本申请提供的另一个实施例中，所述向接入网设备发送RRC消息，包括：
处于空闲态的终端在RRC层发起RRC连接建立，并向接入网设备发送RRC消息。
本申请提供的另一个实施例中，所述向接入网设备发送RRC消息，包括：
在RRC连接建立的过程中或者RRC连接建立完成后，向接入网设备发送RRC消息。
本申请提供的另一个实施例中，所述多播指示信息包括：用于指示接收多播会话业务的指示信息、待接收的多播会话业务的会话标识中的一种或者多种。
本申请提供的另一个实施例中，所述指示信息的预设长度为N比特，其中，N为正整数。
本申请提供的另一个实施例中，所述RRC消息包括已有RRC消息或新增RRC消息。
第二方面，本申请实施例还提供一种AMF选择方法，应用于接入网设备，包括：
接收终端发送的RRC消息；其中，所述RRC消息携带有多播指示信息；
根据所述多播指示信息，选择与所述多播指示信息匹配的AMF。
本申请提供的另一个实施例中，若所述多播指示信息为用于指示接收多播会话业务的指示信息，则根据所述多播指示信息，选择与所述多播指示信息匹配的AMF，包括：
根据所述指示信息，选择支持所述指示信息对应的多播会话业务的AMF。
本申请提供的另一个实施例中，若所述多播指示信息为用于指示接收第一多播会话业务的指示信息，则根据所述多播指示信息，选择与所述多播指示信息匹配的AMF，包括：
根据所述指示信息，选择支持所述指示信息对应的第一多播会话业务的AMF。
本申请提供的另一个实施例中，若所述多播指示信息为待接收的多播会话业务的会话标识，则根据所述多播指示信息，选择与所述多播指示信息匹配的AMF，包括：
根据所述待接收的多播会话业务的会话标识，选择支持所述会话标识对应的多播会话业务的AMF。
本申请提供的另一个实施例中，若所述多播指示信息为第一多播会话业务的会话标识，则根据所述多播指示信息，选择与所述多播指示信息匹配的AMF，包括：
根据所述第一多播会话业务的会话标识，选择支持所述会话标识对应的第一多播会话业务的AMF。
第三方面，本申请实施例还提供一种终端，包括存储器，收发机，处理器，其中：
存储器，用于存储计算机程序；收发机，用于在所述处理器的控制下收发数据；处理器，用于读取所述存储器中的计算机程序并实现如上所述第一方面所述的AMF选择方法的步骤。
第四方面，本申请实施例还提供一种接入网设备，包括存储器，收发机，处理器，其中：
存储器，用于存储计算机程序；收发机，用于在所述处理器的控制下收发数据；处理器，用于读取所述存储器中的计算机程序并实现如上所述第二方面所述的AMF选择方法的步骤。
第五方面，本申请实施例还提供一种AMF选择装置，应用于终端，包括：
确定单元，用于确定待接收多播会话业务；
发送单元，用于向接入网设备发送RRC消息；
其中，所述RRC消息携带有多播指示信息，所述多播指示信息用于指示所述接入网设备选择与所述多播指示信息匹配的AMF。
第六方面，本申请实施例还提供一种AMF选择装置，应用于接入网设备， 包括：
接收单元，用于接收终端发送的RRC消息；其中，所述RRC消息携带有多播指示信息；
选择单元，用于根据所述多播指示信息，选择与所述多播指示信息匹配的AMF。
第七方面，本申请实施例还提供一种处理器可读存储介质，所述处理器可读存储介质存储有计算机程序，所述计算机程序用于使所述处理器执行如上所述第一方面所述的AMF选择方法的步骤，或执行如上所述第二方面所述的AMF选择方法的步骤。
本申请实施例提供的AMF选择方法、设备、装置及存储介质，终端可以在确定待接收多播会话业务后，通过RRC消息中携带的多播指示信息指示接入网设备为终端选择与多播指示信息相匹配的AMF，从而保证了终端能够正常接收多播业务。
附图说明
为了更清楚地说明本申请实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作一简单地介绍，显而易见地，下面描述中的附图是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是现有技术提供的基站与AMF连接的场景示意图；
图2是本申请实施例提供的AMF选择方法的流程示意图之一；
图3是本申请实施例提供的AMF选择方法的流程示意图之二；
图4是本申请实施例提供的AMF选择过程的实施示意图之一；
图5是本申请实施例提供的AMF选择过程的实施示意图之二；
图6是本申请实施例提供的AMF选择过程的实施示意图之三；
图7是本申请实施例提供的终端的结构示意图；
图8是本申请实施例提供的接入网设备的结构示意图；
图9是本申请实施例提供的AMF选择装置的结构示意图之一；
图10是本申请实施例提供的AMF选择装置的结构示意图之二。
具体实施方式
本申请实施例中术语“和/或”，描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。字符“/”一般表示前后关联对象是一种“或”的关系。
本申请实施例中术语“多个”是指两个或两个以上，其它量词与之类似。
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本申请一部分实施例，并不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
为了便于更加清晰地理解本申请各实施例，首先对一些相关的背景知识进行如下介绍。
1、NG无线接入网(NG-Radio Access Network，NG-RAN)的AMF选择过程
5G核心网中的网元AMF负责对终端的接入和移动性进行管理。当终端进入RRC连接态后，接入网设备(例如基站)需要选择一个为终端服务的AMF。
在网络部署中，一个基站可以连接到多个AMF，这些AMF可能属于不同的公共陆地移动网络(Public Land Mobile Network，PLMN)，也可能同属于某个特定的PLMN。图1为现有技术提供的基站与AMF连接的场景示意图，如图1所示，在该场景中，一个基站可以连接到属于同一个PLMN的多个AMF，其中AMF 1和AMF 2支持MBS功能，AMF 3不支持MBS功能。
2、终端加入多播会话(join the multicast session)过程
5G下，MBS多播业务仅允许获得5G核心网授权的终端进行接收，因此终端在开始接收一个多播业务的数据之前，终端需要通过执行非接入层的加入多播会话过程获得5G核心网的授权。通常，加入多播会话业务过程在终 端处于RRC空闲态时发起。
非接入层的加入多播会话过程需要5G核心网的具有MBS功能的AMF、会话管理功能(Session Management Function，SMF)和多播广播会话管理功能(Multicast Broadcast SMF，MB-SMF)等网元参与。
然而，现有技术下，处于RRC空闲态下的终端在进入RRC连接态以执行非接入层的MBS相关信令流程，如加入多播会话过程时，接入网设备可能选择一个不支持MBS功能的AMF网元为终端服务，从而导致该多播业务接收失败。
针对上述问题，本申请各实施例提供一种解决方案，使得接入网设备可以选择支持MBS功能的AMF或者支持特定多播业务的AMF为终端服务，从而保证多播业务接收的正常进行。
图2为本申请实施例提供的AMF选择方法的流程示意图之一，该方法应用于终端，如图2所示，该方法包括如下步骤：
步骤200、确定待接收多播会话业务。
需要说明的是，本申请实施例中记载的待接收多播会话业务可以指任一项多播会话业务，即第一多播会话业务。第一多播会话业务可以是终端感兴趣的多播会话业务，也可以是终端有需求要接收的多播会话业务，还可以是终端正在接收的多播会话业务，具体情形不做限定。
步骤201、向接入网设备发送RRC消息。
其中，RRC消息携带有多播指示信息，多播指示信息用于指示接入网设备选择与多播指示信息匹配的AMF。
具体地，为了避免接入网设备(例如基站)选择一个不支持MBS功能的AMF网元为终端服务，从而导致终端无法正常接收到多播业务，在接入网设备选择为终端服务的AMF之前，终端可以在确定待接收多播会话业务后，向接入网设备发送RRC消息，RRC消息中携带多播指示信息，多播指示信息用于指示接入网设备选择与该多播指示信息相匹配的AMF，从而接入网设备在接收到携带多播指示信息的RRC消息后，可以选择与多播指示信息相匹配的AMF为终端服务。
本申请实施例提供的AMF选择方法，终端可以在确定待接收多播会话业务后，通过RRC消息中携带的多播指示信息指示接入网设备为终端选择与多播指示信息相匹配的AMF，从而保证了终端能够正常接收多播业务。
本申请提供的另一个实施例中，所述向接入网设备发送RRC消息，包括：
处于空闲态的终端在RRC层发起RRC连接建立，并向接入网设备发送RRC消息。
具体地，通常加入多播会话过程在终端处于RRC空闲态时发起，并在进入RRC连接态后执行加入多播会话过程，本申请实施例中，终端向接入网设备发送RRC消息可以是指处于空闲态的终端在RRC层发起RRC连接建立，并向接入网设备发送携带有多播指示信息的RRC消息。
本申请提供的另一个实施例中，所述向接入网设备发送RRC消息，包括：
在RRC连接建立的过程中或者RRC连接建立完成后，向接入网设备发送RRC消息。
具体地，本申请实施例中，终端向接入网设备发送携带有多播指示信息的RRC消息可以是在RRC连接建立的过程中或者RRC连接建立完成后。
本申请提供的另一个实施例中，所述多播指示信息包括：用于指示接收多播会话业务的指示信息、待接收的多播会话业务的会话标识中的一种或者多种。
具体地，终端向接入网设备发送的RRC消息中携带的多播指示信息可以是用于指示接收多播会话业务的指示信息，也可以是待接收的多播会话业务的会话标识。
其中，用于指示接收多播会话业务的指示信息可以是MBS指示，也可以是多播指示，该指示信息可以向接入网设备指示终端需要接收多播业务，从而接入网设备获取到该指示信息后，可以选择支持该指示信息对应的多播会话业务的AMF为终端服务。
本申请提供的另一个实施例中，所述多播指示信息包括：用于指示接收第一多播会话业务的指示信息、第一多播会话业务的会话标识中的一种或者多种。
本申请提供的另一个实施例中，上述用于指示接收多播会话业务的指示信息的预设长度可以为N比特，其中，N为正整数。例如，终端可以在MSG5(RRCSetupComplete，RRC建立完成)消息中包含1个比特位的多播指示(Multicast-Indication)，如下所示：
Figure PCTCN2022098933-appb-000001
待接收的多播会话业务的会话标识可以是MBS会话标识，也可以是多播会话标识，该待接收的多播会话业务的会话标识用于向接入网设备指示终端要加入的多播会话，从而接入网设备获取到该待接收的多播会话业务的会话标识后，可以选择支持该会话标识对应的多播会话业务的AMF为终端服务。
例如，在5G***中，多播业务的会话标识称为临时移动组标识(Temporary Mobile Group Identity，TMGI)，终端可以在MSG5消息中包含MBS会话标识(MBS session ID)，如下所示：
Figure PCTCN2022098933-appb-000002
本申请实施例提供的AMF选择方法，终端可以在RRC消息中携带不同的多播指示信息，使得接入网设备可以灵活地选择与多播指示信息相匹配的AMF为终端服务。
本申请提供的另一个实施例中，携带上述多播指示信息的RRC消息可以包括已有RRC消息或新增RRC消息。其中，已有RRC消息即现有RRC消 息，新增RRC消息即区别于现有RRC消息的、新定义的新RRC消息。
上述RRC消息可以是终端在RRC连接建立的过程中向接入网设备发送的，也可以是终端在RRC建立完成后向接入网设备发送的。例如，RRC连接建立的过程中，向接入网设备发送的已有RRC消息可以包括RRCSetupRequest(RRC建立请求)消息即MSG3消息，或RRCSetupComplete消息即MSG5消息。
本申请实施例提供的AMF选择方法，终端可以通过不同的RRC消息携带多播指示信息，从而提高了终端向接入网设备发送多播指示信息的灵活性。
图3为本申请实施例提供的AMF选择方法的流程示意图之二，该方法应用于接入网设备(例如基站)，如图3所示，该方法包括如下步骤：
步骤300、接收终端发送的RRC消息；其中，RRC消息携带有多播指示信息；
步骤301、根据多播指示信息，选择与多播指示信息匹配的AMF。
具体地，在接入网设备选择为终端服务的AMF之前，终端可以在确定待接收多播会话业务后，向接入网设备发送RRC消息，RRC消息中携带多播指示信息。
接入网设备接收到终端发送的携带有多播指示信息的RRC消息后，可以选择与多播指示信息相匹配的AMF为终端服务，从而避免了接入网设备为终端选择一个不支持MBS功能的AMF网元，而导致终端无法正常接收多播业务。
本申请实施例提供的AMF选择方法，接入网设备可以在确定待接收多播会话业务后，接收终端发送的携带多播指示信息的RRC消息，并选择与多播指示信息相匹配的AMF为终端服务，从而保证了终端能够正常接收多播业务。
本申请提供的另一个实施例中，若多播指示信息为用于指示接收多播会话业务的指示信息，则根据多播指示信息，选择与多播指示信息匹配的AMF，包括：
根据指示信息，选择支持指示信息对应的多播会话业务的AMF。
具体地，终端向接入网设备发送的RRC消息中携带的多播指示信息可以是用于指示接收多播会话业务的指示信息，该指示信息可以是MBS指示，也可以是多播指示，该指示信息可以向接入网设备指示终端需要接收多播业务，接入网设备接收到携带有该指示信息的RRC消息后，可以根据该指示信息选择支持该指示信息对应的多播会话业务的AMF为终端服务。
本申请提供的另一个实施例中，若多播指示信息为用于指示接收第一多播会话业务的指示信息，则根据多播指示信息，选择与多播指示信息匹配的AMF，包括：
根据指示信息，选择支持指示信息对应的第一多播会话业务的AMF。
本申请提供的另一个实施例中，若多播指示信息为待接收的多播会话业务的会话标识，则根据多播指示信息，选择与多播指示信息匹配的AMF，包括：
根据待接收的多播会话业务的会话标识，选择支持会话标识对应的多播会话业务的AMF。
具体地，终端向接入网设备发送的RRC消息中携带的多播指示信息可以是待接收的多播会话业务的会话标识，该待接收的多播会话业务的会话标识可以是MBS会话标识，也可以是多播会话标识，该待接收的多播会话业务的会话标识用于向接入网设备指示终端要加入的多播会话，接入网设备接收到携带有该会话标识的RRC消息后，可以选择支持该会话标识对应的多播会话业务的AMF为终端服务。
本申请提供的另一个实施例中，若多播指示信息为第一多播会话业务的会话标识，则根据多播指示信息，选择与多播指示信息匹配的AMF，包括：
根据第一多播会话业务的会话标识，选择支持会话标识对应的第一多播会话业务的AMF。
本申请实施例提供的AMF选择方法，接入网设备可以根据终端在RRC消息中携带的不同的多播指示信息，灵活地选择与多播指示信息相匹配的AMF为终端服务，保证了终端能够正常接收多播业务。
图4为本申请实施例提供的AMF选择过程的实施示意图之一，如图4 所示，终端可以在MSG5消息中包含多播指示信息以辅助基站进行AMF选择，其过程包括如下步骤：
步骤400、空闲态终端非接入层发起加入多播会话过程。
步骤401、空闲态终端RRC层发起RRC连接建立过程，终端在发给基站的MSG5即RRCSetupComplete消息中携带多播指示信息，其中多播指示信息可以是用于指示接收多播会话业务的指示信息，也可以是待接收的多播会话业务的会话标识。
步骤402、RRC连接建立完成后，基站根据此前接收到的多播指示信息的内容，选择一个支持MBS功能的AMF或者支持特定多播业务的AMF。
步骤403、基站将来自终端的非接入层的MBS相关控制信令Initial UE message(初始终端消息，例如：加入多播会话请求消息)转发到步骤402中选定的AMF。
图5为本申请实施例提供的AMF选择过程的实施示意图之二，如图5所示，终端可以在MSG3消息中包含多播指示信息以辅助基站进行AMF选择，其过程包括如下步骤：
步骤500、空闲态终端非接入层发起加入多播会话过程。
步骤501、空闲态终端RRC层发起RRC连接建立过程，终端在发给基站的MSG3即RRCSetupRequest消息中携带多播指示信息，其中多播指示信息可以是用于指示接收多播会话业务的指示信息，也可以是待接收的多播会话业务的会话标识。
步骤502、RRC连接建立完成后，基站根据此前接收到的多播指示信息的内容，选择一个支持MBS功能的AMF或者支持特定多播业务的AMF。
步骤503、基站将来自终端的非接入层的MBS相关控制信令Initial UE message(初始终端消息，例如：加入多播会话请求消息)转发到步骤502中选定的AMF。
图6为本申请实施例提供的AMF选择过程的实施示意图之三，如图6所示，终端可以在新定义的新RRC消息中包含多播指示信息以辅助基站进行AMF选择，其过程包括如下步骤：
步骤600、空闲态终端非接入层发起加入多播会话过程。
步骤601、空闲态终端RRC层发起RRC连接建立过程，在RRC连接建立过程中或RRC连接建立完成后，终端向基站发送新RRC消息，其中携带多播指示信息，其中多播指示信息可以是用于指示接收多播会话业务的指示信息，也可以是待接收的多播会话业务的会话标识。
步骤602、基站触发AMF选择，根据此前接收到的多播指示信息的内容，选择一个支持MBS功能的AMF或者支持特定多播业务的AMF。
步骤603、基站将来自终端的非接入层的MBS相关控制信令Initial UE message(初始终端消息，例如：加入多播会话请求消息)转发到步骤602中选定的AMF。
本申请各实施例提供的方法和装置是基于同一申请构思的，由于方法和装置解决问题的原理相似，因此装置和方法的实施可以相互参见，重复之处不再赘述。
图7为本申请实施例提供的终端的结构示意图，如图7所示，该终端包括存储器720，收发机710和处理器700；其中，处理器700与存储器720也可以物理上分开布置。
存储器720，用于存储计算机程序；收发机710，用于在处理器700的控制下收发数据。
具体地，收发机710用于在处理器700的控制下接收和发送数据。
其中，在图7中，总线架构可以包括任意数量的互联的总线和桥，具体由处理器700代表的一个或多个处理器和存储器720代表的存储器的各种电路链接在一起。总线架构还可以将诸如***设备、稳压器和功率管理电路等之类的各种其他电路链接在一起，这些都是本领域所公知的，因此，本申请不再对其进行进一步描述。总线接口提供接口。收发机710可以是多个元件，即包括发送机和接收机，提供用于在传输介质上与各种其他装置通信的单元，这些传输介质包括无线信道、有线信道、光缆等传输介质。针对不同的用户设备，用户接口730还可以是能够外接内接需要设备的接口，连接的设备包括但不限于小键盘、显示器、扬声器、麦克风、操纵杆等。
处理器700负责管理总线架构和通常的处理，存储器720可以存储处理器700在执行操作时所使用的数据。
处理器700可以是中央处理器(Central Processing Unit,CPU)、专用集成电路(Application Specific Integrated Circuit，ASIC)、现场可编程门阵列(Field－Programmable Gate Array，FPGA)或复杂可编程逻辑器件(Complex Programmable Logic Device，CPLD)，处理器也可以采用多核架构。
处理器700通过调用存储器720存储的计算机程序，用于按照获得的可执行指令执行本申请实施例提供的任一所述方法，例如：确定待接收多播会话业务；向接入网设备发送RRC消息；其中，RRC消息携带有多播指示信息，多播指示信息用于指示接入网设备选择与多播指示信息匹配的AMF。
本申请提供的另一个实施例中，该方法包括：
确定第一多播会话业务；
向接入网设备发送RRC消息；
其中，RRC消息携带有多播指示信息，多播指示信息用于指示接入网设备选择与多播指示信息匹配的AMF。
本申请提供的另一个实施例中，向接入网设备发送RRC消息，包括：处于空闲态的终端在RRC层发起RRC连接建立，并向接入网设备发送RRC消息。
本申请提供的另一个实施例中，向接入网设备发送RRC消息，包括：在RRC连接建立的过程中或者RRC连接建立完成后，向接入网设备发送RRC消息。
本申请提供的另一个实施例中，多播指示信息包括：用于指示接收多播会话业务的指示信息、待接收的多播会话业务的会话标识中的一种或者多种。
本申请提供的另一个实施例中，多播指示信息包括：用于指示接收第一多播会话业务的指示信息、第一多播会话业务的会话标识中的一种或者多种。
本申请提供的另一个实施例中，指示信息的预设长度为N比特，其中，N为正整数。
本申请提供的另一个实施例中，RRC消息包括已有RRC消息或新增RRC 消息。
图8为本申请实施例提供的接入网设备的结构示意图，如图8所示，该接入网设备包括存储器820，收发机810和处理器800；其中，处理器800与存储器820也可以物理上分开布置。
存储器820，用于存储计算机程序；收发机810，用于在处理器800的控制下收发数据。
具体地，收发机810用于在处理器800的控制下接收和发送数据。
其中，在图8中，总线架构可以包括任意数量的互联的总线和桥，具体由处理器800代表的一个或多个处理器和存储器820代表的存储器的各种电路链接在一起。总线架构还可以将诸如***设备、稳压器和功率管理电路等之类的各种其他电路链接在一起，这些都是本领域所公知的，因此，本申请不再对其进行进一步描述。总线接口提供接口。收发机810可以是多个元件，即包括发送机和接收机，提供用于在传输介质上与各种其他装置通信的单元，这些传输介质包括无线信道、有线信道、光缆等传输介质。
处理器800负责管理总线架构和通常的处理，存储器820可以存储处理器800在执行操作时所使用的数据。
处理器800可以是CPU、ASIC、FPGA或CPLD，处理器也可以采用多核架构。
处理器800通过调用存储器820存储的计算机程序，用于按照获得的可执行指令执行本申请实施例提供的任一所述方法，例如：接收终端发送的RRC消息；其中，RRC消息携带有多播指示信息；根据多播指示信息，选择与多播指示信息匹配的AMF。
本申请提供的另一个实施例中，若多播指示信息为用于指示接收多播会话业务的指示信息，则根据多播指示信息，选择与多播指示信息匹配的AMF，包括：根据指示信息，选择支持指示信息对应的多播会话业务的AMF。
本申请提供的另一个实施例中，若多播指示信息为用于指示接收第一多播会话业务的指示信息，则根据多播指示信息，选择与多播指示信息匹配的AMF，包括：
根据指示信息，选择支持指示信息对应的第一多播会话业务的AMF。
本申请提供的另一个实施例中，若多播指示信息为待接收的多播会话业务的会话标识，则根据多播指示信息，选择与多播指示信息匹配的AMF，包括：根据待接收的多播会话业务的会话标识，选择支持会话标识对应的多播会话业务的AMF。
本申请提供的另一个实施例中，若多播指示信息为第一多播会话业务的会话标识，则根据多播指示信息，选择与多播指示信息匹配的AMF，包括：
根据第一多播会话业务的会话标识，选择支持会话标识对应的第一多播会话业务的AMF。
在此需要说明的是，本申请实施例提供的上述终端和接入网设备，能够实现上述方法实施例所实现的所有方法步骤，且能够达到相同的技术效果，在此不再对本实施例中与方法实施例相同的部分及有益效果进行具体赘述。
图9为本申请实施例提供的AMF选择装置的结构示意图之一，该装置应用于终端，如图9所示，该装置包括：
确定单元900，用于确定待接收多播会话业务；
发送单元910，用于向接入网设备发送RRC消息；
其中，RRC消息携带有多播指示信息，多播指示信息用于指示接入网设备选择与多播指示信息匹配的AMF。
本申请提供的另一个实施例中，该装置包括：
确定单元900，用于确定第一多播会话业务；
发送单元910，用于向接入网设备发送RRC消息；
其中，RRC消息携带有多播指示信息，多播指示信息用于指示接入网设备选择与多播指示信息匹配的AMF。
本申请提供的另一个实施例中，向接入网设备发送RRC消息，包括：处于空闲态的终端在RRC层发起RRC连接建立，并向接入网设备发送RRC消息。
本申请提供的另一个实施例中，向接入网设备发送RRC消息，包括：在RRC连接建立的过程中或者RRC连接建立完成后，向接入网设备发送RRC 消息。
本申请提供的另一个实施例中，多播指示信息包括：用于指示接收多播会话业务的指示信息、待接收的多播会话业务的会话标识中的一种或者多种。
本申请提供的另一个实施例中，多播指示信息包括：用于指示接收第一多播会话业务的指示信息、第一多播会话业务的会话标识中的一种或者多种。
本申请提供的另一个实施例中，指示信息的预设长度为N比特，其中，N为正整数。
本申请提供的另一个实施例中，RRC消息包括已有RRC消息或新增RRC消息。
图10为本申请实施例提供的AMF选择装置的结构示意图之二，该装置应用于接入网设备，如图10所示，该装置包括：
接收单元1000，用于接收终端发送的RRC消息；其中，RRC消息携带有多播指示信息；
选择单元1010，用于根据所述多播指示信息，选择与多播指示信息匹配的AMF。
本申请提供的另一个实施例中，若多播指示信息为用于指示接收多播会话业务的指示信息，则根据所述多播指示信息，选择与多播指示信息匹配的AMF，包括：根据指示信息，选择支持指示信息对应的多播会话业务的AMF。
本申请提供的另一个实施例中，若多播指示信息为用于指示接收第一多播会话业务的指示信息，则根据多播指示信息，选择与多播指示信息匹配的AMF，包括：
根据指示信息，选择支持指示信息对应的第一多播会话业务的AMF。
本申请提供的另一个实施例中，若多播指示信息为待接收的多播会话业务的会话标识，则根据所述多播指示信息，选择与多播指示信息匹配的AMF，包括：根据待接收的多播会话业务的会话标识，选择支持会话标识对应的多播会话业务的AMF。
本申请提供的另一个实施例中，若多播指示信息为第一多播会话业务的会话标识，则根据多播指示信息，选择与多播指示信息匹配的AMF，包括：
根据第一多播会话业务的会话标识，选择支持会话标识对应的第一多播会话业务的AMF。
需要说明的是，本申请实施例中对单元的划分是示意性的，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式。另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。
所述集成的单元如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个处理器可读取存储介质中。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的全部或部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)或处理器(processor)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(Read-Only Memory，ROM)、随机存取存储器(Random Access Memory，RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
在此需要说明的是，本申请实施例提供的上述装置，能够实现上述方法实施例所实现的所有方法步骤，且能够达到相同的技术效果，在此不再对本实施例中与方法实施例相同的部分及有益效果进行具体赘述。
另一方面，本申请实施例还提供一种处理器可读存储介质，所述处理器可读存储介质存储有计算机程序，所述计算机程序用于使所述处理器执行上述各实施例提供的AMF选择方法，包括：确定待接收多播会话业务；向接入网设备发送RRC消息；其中，RRC消息携带有多播指示信息，多播指示信息用于指示接入网设备选择与多播指示信息匹配的AMF。
另一方面，本申请实施例还提供一种处理器可读存储介质，所述处理器可读存储介质存储有计算机程序，所述计算机程序用于使所述处理器执行上述各实施例提供的AMF选择方法，包括：接收终端发送的RRC消息；其中，RRC消息携带有多播指示信息；根据多播指示信息，选择与多播指示信息匹 配的AMF。
所述处理器可读存储介质可以是处理器能够存取的任何可用介质或数据存储设备，包括但不限于磁性存储器(例如软盘、硬盘、磁带、磁光盘(MO)等)、光学存储器(例如CD、DVD、BD、HVD等)、以及半导体存储器(例如ROM、EPROM、EEPROM、非易失性存储器(NAND FLASH)、固态硬盘(SSD))等。
本申请实施例提供的技术方案可以适用于多种***，尤其是5G***。例如适用的***可以是全球移动通讯(global system of mobile communication，GSM)***、码分多址(code division multiple access，CDMA)***、宽带码分多址(Wideband Code Division Multiple Access，WCDMA)通用分组无线业务(general packet radio service，GPRS)***、长期演进(long term evolution，LTE)***、LTE频分双工(frequency division duplex，FDD)***、LTE时分双工(time division duplex，TDD)***、高级长期演进(long term evolution advanced，LTE-A)***、通用移动***(universal mobile telecommunication system，UMTS)、全球互联微波接入(worldwide interoperability for microwave access，WiMAX)***、5G新空口(New Radio,NR)***等。这多种***中均包括终端设备和网络设备。***中还可以包括核心网部分，例如演进的分组***(Evloved Packet System,EPS)、5G***(5GS)等。
本申请实施例涉及的终端，可以是指向用户提供语音和/或数据连通性的设备，具有无线连接功能的手持式设备、或连接到无线调制解调器的其他处理设备等。在不同的***中，终端的名称可能也不相同，例如在5G***中，终端可以称为用户设备(User Equipment，UE)。无线终端设备可以经无线接入网(Radio Access Network,RAN)与一个或多个核心网(Core Network,CN)进行通信，无线终端设备可以是移动终端设备，如移动电话(或称为“蜂窝”电话)和具有移动终端设备的计算机，例如，可以是便携式、袖珍式、手持式、计算机内置的或者车载的移动装置，它们与无线接入网交换语言和/或数据。例如，个人通信业务(Personal Communication Service，PCS)电话、无 绳电话、会话发起协议(Session Initiated Protocol，SIP)话机、无线本地环路(Wireless Local Loop，WLL)站、个人数字助理(Personal Digital Assistant，PDA)等设备。无线终端设备也可以称为***、订户单元(subscriber unit)、订户站(subscriber station)，移动站(mobile station)、移动台(mobile)、远程站(remote station)、接入点(access point)、远程终端设备(remote terminal)、接入终端设备(access terminal)、用户终端设备(user terminal)、用户代理(user agent)、用户装置(user device)，本申请实施例中并不限定。
本申请实施例涉及的接入网设备，可以是基站，该基站可以包括多个为终端提供服务的小区。根据具体应用场合不同，基站又可以称为接入点，或者可以是接入网中在空中接口上通过一个或多个扇区与无线终端设备通信的设备，或者其它名称。接入网设备可用于将收到的空中帧与网际协议(Internet Protocol，IP)分组进行相互更换，作为无线终端设备与接入网的其余部分之间的路由器，其中接入网的其余部分可包括网际协议(IP)通信网络。接入网设备还可协调对空中接口的属性管理。例如，本申请实施例涉及的接入网设备可以是全球移动通信***(Global System for Mobile communications，GSM)或码分多址接入(Code Division Multiple Access，CDMA)中的网络设备(Base Transceiver Station，BTS)，也可以是带宽码分多址接入(Wide-band Code Division Multiple Access，WCDMA)中的网络设备(NodeB)，还可以是长期演进(long term evolution，LTE)***中的演进型网络设备(evolutional Node B，eNB或e-NodeB)、5G网络架构(next generation system)中的5G基站(gNB)，也可以是家庭演进基站(Home evolved Node B，HeNB)、中继节点(relay node)、家庭基站(femto)、微微基站(pico)等，本申请实施例中并不限定。
终端与接入网设备之间可以各自使用一或多根天线进行多输入多输出(Multi Input Multi Output,MIMO)传输，MIMO传输可以是单用户MIMO(Single User MIMO,SU-MIMO)或多用户MIMO(Multiple User MIMO,MU-MIMO)。根据天线组合的形态和数量，MIMO传输可以是2D-MIMO、3D-MIMO、FD-MIMO或massive-MIMO，也可以是分集传输或预编码传输 或波束赋形传输等。
本领域内的技术人员应明白，本申请的实施例可提供为方法、***、或计算机程序产品。因此，本申请可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本申请可采用在一个或多个其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器和光学存储器等)上实施的计算机程序产品的形式。
本申请是参照根据本申请实施例的方法、设备(***)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机可执行指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机可执行指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些处理器可执行指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的处理器可读存储器中，使得存储在该处理器可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些处理器可执行指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
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 (24)

  1. 一种AMF选择方法，其特征在于，应用于终端，包括：
    确定第一多播会话业务；
    向接入网设备发送RRC消息；
    其中，所述RRC消息携带有多播指示信息，所述多播指示信息用于指示所述接入网设备选择与所述多播指示信息匹配的AMF。
  2. 根据权利要求1所述的AMF选择方法，其特征在于，所述向接入网设备发送RRC消息，包括：
    处于空闲态的终端在RRC层发起RRC连接建立，并向接入网设备发送RRC消息。
  3. 根据权利要求1或2所述的AMF选择方法，其特征在于，所述向接入网设备发送RRC消息，包括：
    在RRC连接建立的过程中或者RRC连接建立完成后，向接入网设备发送RRC消息。
  4. 根据权利要求1所述的AMF选择方法，其特征在于，所述多播指示信息包括：用于指示接收第一多播会话业务的指示信息、第一多播会话业务的会话标识中的一种或者多种。
  5. 根据权利要求4所述的AMF选择方法，其特征在于，所述指示信息的预设长度为N比特，其中，N为正整数。
  6. 根据权利要求3所述的AMF选择方法，其特征在于，所述RRC消息包括已有RRC消息或新增RRC消息。
  7. 一种AMF选择方法，其特征在于，应用于接入网设备，包括：
    接收终端发送的RRC消息；其中，所述RRC消息携带有多播指示信息；
    根据所述多播指示信息，选择与所述多播指示信息匹配的AMF。
  8. 根据权利要求7所述的AMF选择方法，其特征在于，若所述多播指示信息为用于指示接收第一多播会话业务的指示信息，则根据所述多播指示信息，选择与所述多播指示信息匹配的AMF，包括：
    根据所述指示信息，选择支持所述指示信息对应的第一多播会话业务的 AMF。
  9. 根据权利要求7所述的AMF选择方法，其特征在于，若所述多播指示信息为第一多播会话业务的会话标识，则根据所述多播指示信息，选择与所述多播指示信息匹配的AMF，包括：
    根据所述第一多播会话业务的会话标识，选择支持所述会话标识对应的第一多播会话业务的AMF。
  10. 一种终端，包括存储器，收发机，处理器：
    存储器，用于存储计算机程序；收发机，用于在所述处理器的控制下收发数据；处理器，用于读取所述存储器中的计算机程序并执行以下操作：
    确定第一多播会话业务；
    向接入网设备发送RRC消息；
    其中，所述RRC消息携带有多播指示信息，所述多播指示信息用于指示所述接入网设备选择与所述多播指示信息匹配的AMF。
  11. 根据权利要求10所述的终端，其特征在于，所述向接入网设备发送RRC消息，包括：
    处于空闲态的终端在RRC层发起RRC连接建立，并向接入网设备发送RRC消息。
  12. 根据权利要求10或11所述的终端，其特征在于，所述向接入网设备发送RRC消息，包括：
    在RRC连接建立的过程中或者RRC连接建立完成后，向接入网设备发送RRC消息。
  13. 根据权利要求10所述的终端，其特征在于，所述多播指示信息包括：用于指示接收第一多播会话业务的指示信息、第一多播会话业务的会话标识中的一种或者多种。
  14. 一种接入网设备，包括存储器，收发机，处理器：
    存储器，用于存储计算机程序；收发机，用于在所述处理器的控制下收发数据；处理器，用于读取所述存储器中的计算机程序并执行以下操作：
    接收终端发送的RRC消息；其中，所述RRC消息携带有多播指示信息；
    根据所述多播指示信息，选择与所述多播指示信息匹配的AMF。
  15. 根据权利要求14所述的接入网设备，其特征在于，若所述多播指示信息为用于指示接收第一多播会话业务的指示信息，则根据所述多播指示信息，选择与所述多播指示信息匹配的AMF，包括：
    根据所述指示信息，选择支持所述指示信息对应的第一多播会话业务的AMF。
  16. 根据权利要求14所述的接入网设备，其特征在于，若所述多播指示信息为第一多播会话业务的会话标识，则根据所述多播指示信息，选择与所述多播指示信息匹配的AMF，包括：
    根据所述第一多播会话业务的会话标识，选择支持所述会话标识对应的第一多播会话业务的AMF。
  17. 一种AMF选择装置，其特征在于，应用于终端，包括：
    确定单元，用于确定第一多播会话业务；
    发送单元，用于向接入网设备发送RRC消息；
    其中，所述RRC消息携带有多播指示信息，所述多播指示信息用于指示所述接入网设备选择与所述多播指示信息匹配的AMF。
  18. 根据权利要求17所述的AMF选择装置，其特征在于，所述向接入网设备发送RRC消息，包括：
    处于空闲态的终端在RRC层发起RRC连接建立，并向接入网设备发送RRC消息。
  19. 根据权利要求17或18所述的AMF选择装置，其特征在于，所述向接入网设备发送RRC消息，包括：
    在RRC连接建立的过程中或者RRC连接建立完成后，向接入网设备发送RRC消息。
  20. 根据权利要求17所述的AMF选择装置，其特征在于，所述多播指示信息包括：用于指示接收第一多播会话业务的指示信息、第一多播会话业务的会话标识中的一种或者多种。
  21. 一种AMF选择装置，其特征在于，应用于接入网设备，包括：
    接收单元，用于接收终端发送的RRC消息；其中，所述RRC消息携带有多播指示信息；
    选择单元，用于根据所述多播指示信息，选择与所述多播指示信息匹配的AMF。
  22. 根据权利要求21所述的AMF选择装置，其特征在于，若所述多播指示信息为用于指示接收第一多播会话业务的指示信息，则根据所述多播指示信息，选择与所述多播指示信息匹配的AMF，包括：
    根据所述指示信息，选择支持所述指示信息对应的第一多播会话业务的AMF。
  23. 根据权利要求21所述的AMF选择装置，其特征在于，若所述多播指示信息为第一多播会话业务的会话标识，则根据所述多播指示信息，选择与所述多播指示信息匹配的AMF，包括：
    根据所述第一多播会话业务的会话标识，选择支持所述会话标识对应的第一多播会话业务的AMF。
  24. 一种处理器可读存储介质，其特征在于，所述处理器可读存储介质存储有计算机程序，所述计算机程序用于使所述处理器执行权利要求1至6任一项所述的方法，或执行权利要求7至9任一项所述的方法。
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