WO2021012736A1 - 一种会话管理网元的选择方法、装置及系统 - Google Patents

一种会话管理网元的选择方法、装置及系统 Download PDF

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Publication number
WO2021012736A1
WO2021012736A1 PCT/CN2020/086879 CN2020086879W WO2021012736A1 WO 2021012736 A1 WO2021012736 A1 WO 2021012736A1 CN 2020086879 W CN2020086879 W CN 2020086879W WO 2021012736 A1 WO2021012736 A1 WO 2021012736A1
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Prior art keywords
dnai
session
network element
management network
information
Prior art date
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PCT/CN2020/086879
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English (en)
French (fr)
Inventor
周晓云
宗在峰
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP20843697.2A priority Critical patent/EP3986007A4/en
Publication of WO2021012736A1 publication Critical patent/WO2021012736A1/zh
Priority to US17/582,528 priority patent/US20220150683A1/en

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    • 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
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/14—Session management
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/12—Setup of transport tunnels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/17—Selecting a data network PoA [Point of Attachment]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/11—Allocation or use of connection identifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks

Definitions

  • This application relates to the field of mobile communication technology, and in particular to a method, device and system for selecting a session management network element.
  • the terminal device establishes a session after accessing the network (here, the session is a protocol data unit (protocol data unit, PDU) session for illustration), and accesses external data through the PDU session
  • the session is a protocol data unit (protocol data unit, PDU) session for illustration)
  • PDU protocol data unit
  • the network realizes the interaction between terminal equipment and application servers deployed in the data network.
  • the access location of the terminal device moves, which may cause the need to reselect the session management network element for the terminal device.
  • the session management network element is generally reselected for the terminal device according to the position information of the terminal device after the movement.
  • This application provides a method, device, and system for selecting a session management network element to realize the selection of a suitable session management network element for a terminal device.
  • the present application provides a method for selecting a session management network element.
  • the method includes: the mobility management network element determines the first DNAI corresponding to the first session of the terminal device; the mobility management network element is the first session of the terminal device.
  • One session selects the first session management network element that supports all or part of the DNAI in the first DNAI.
  • the mobility management network element selects a session management network element for the terminal device.
  • the session management network element supports all or part of the DNAI in the first DNAI, so that the user plane network element selected by the session management network element also supports the first DNAI.
  • All or part of the DNAI in a DNAI that is, the session management network element is responsible for associating the user plane network elements that support part or all of the DNAI in the first DNAI corresponding to the first session, so as to realize the selection of the appropriate session management network element for the terminal device
  • a user plane network element supporting the DNAI corresponding to the first session is selected as the PSA for the terminal device, thereby reducing circuitous routes and reducing network delay.
  • the mobility management network element determining the first DNAI corresponding to the first session of the terminal device includes: the mobility management network element obtains first information, and the first information includes an identifier of the session of the terminal device A second DNAI corresponding to an identifier of the session of the terminal device, where the second DNAI is one or more DNAIs, and the identifier of the session of the terminal device includes the identifier of the first session; the mobility management network element obtains the identifier of the first session; The mobility management network element determines the first DNAI corresponding to the first session according to the identifier of the first session and the first information.
  • the mobility management network element obtains second information, the second information includes the identifier of the first session and the third DNAI corresponding to the identifier of the first session; the mobility management network element according to the third DNAI, Determine the fourth DNAI; the mobility management network element selects the second session management network element that supports all or part of the DNAI in the fourth DNAI for the first session of the terminal device.
  • the fourth DNAI is the same as the third DNAI; or, the fourth DNAI includes the first DNAI and the third DNAI.
  • acquiring the first information by the mobility management network element includes: the mobility management network element receiving the first information from the policy control network element or other mobility management network elements.
  • the mobility management network element acquiring the identifier of the first session includes: the mobility management network element receives a request message from the terminal device, the request message includes the identifier of the first session, and the request message is used to request The first session is established; or, the mobility management network element receives the context information of the terminal device from other mobility management network elements, and the context information includes the identifier of the first session.
  • the mobility management network element determining the first DNAI corresponding to the first session of the terminal device includes: the mobility management network element receives the first DNAI from the policy control network element or other mobility management network elements The first DNAI corresponding to a session.
  • the mobility management network element selects the third session management network element for the first session of the terminal device; the mobility management network element selects the first session that supports all or part of the DNAI in the first DNAI.
  • the first session management network element includes: the mobility management network element determines that the third session management network element does not support all or part of the DNAI in the first DNAI, then selects the one that supports all or part of the DNAI in the first DNAI for the first session The first session management network element.
  • the mobility management network element receives the fifth DNAI corresponding to the first session from the policy control network element; the mobility management network element determines the sixth DNAI according to the fifth DNAI; the mobility management network element A fourth session management network element that supports all or part of the DNAI in the sixth DNAI is selected for the first session of the terminal device.
  • the sixth DNAI is the same as the fifth DNAI; or, the sixth DNAI includes the first DNAI and the fifth DNAI.
  • the identifier of the first session includes one or more of the following: DNN, S-NSSAI.
  • the mobility management network element obtains the DNAI supported by the first session management network element from a network storage network element.
  • the present application provides a method for selecting a session management network element.
  • the method includes: the policy control network element obtains first information.
  • the first information includes the session identifier of the terminal device and the first information corresponding to the session identifier of the terminal device.
  • Two DNAI, the second DNAI is one or more DNAIs; the policy control network element sends the first information to the mobility management network element, and the first information is used for the mobility management network element to select the session management network element.
  • the policy control network element sending the first information to the mobility management network element includes: the policy control network element sends the first information to the mobility management network element during the registration process of the terminal device.
  • this application provides a method for selecting a session management network element.
  • the method includes: the policy control network element obtains the first DNAI corresponding to the first session of the terminal device; and the policy control network element sends the first DNAI to the mobility management network element.
  • the first DNAI corresponding to a session includes: the policy control network element obtains the first DNAI corresponding to the first session of the terminal device; and the policy control network element sends the first DNAI to the mobility management network element.
  • the first DNAI corresponding to a session includes: the policy control network element obtains the first DNAI corresponding to the first session of the terminal device; and the policy control network element sends the first DNAI to the mobility management network element.
  • the first DNAI corresponding to a session includes: the policy control network element obtains the first DNAI corresponding to the first session of the terminal device; and the policy control network element sends the first DNAI to the mobility management network element.
  • the first DNAI corresponding to a session includes: the policy control network element obtains the first DNAI corresponding
  • the policy control network element sending the first DNAI corresponding to the first session to the mobility management network element includes: the policy control network element sends the first DNAI to the mobility management network element during the session establishment process. The first DNAI corresponding to the session.
  • the present application provides a device for selecting a session management network element.
  • the device may be a mobility management network element or a chip for a mobility management network element.
  • the device has the function of realizing the foregoing first aspect or each embodiment of the first aspect. This function can be realized by hardware, or by hardware executing corresponding software.
  • the hardware or software includes one or more modules corresponding to the above-mentioned functions.
  • the present application provides a device for selecting a session management network element.
  • the device may be a policy control network element or a chip for a policy control network element.
  • the device has the function of realizing the foregoing second aspect or each embodiment of the second aspect, or realizing the foregoing third aspect or each embodiment of the third aspect. This function can be realized by hardware, or by hardware executing corresponding software.
  • the hardware or software includes one or more modules corresponding to the above-mentioned functions.
  • the present application provides a device for selecting a session management network element, including a processor and a memory; the memory is used to store computer execution instructions, and when the device is running, the processor executes the computer execution instructions stored in the memory , So that the device executes the method of the above-mentioned first aspect to the third aspect, or the first aspect to the third aspect.
  • the present application provides an apparatus for selecting a session management network element, which includes units or means for executing the steps of the first aspect to the third aspect, or the first aspect to the third aspect.
  • the present application provides a device for selecting a session management network element, including a processor and an interface circuit.
  • the processor is configured to communicate with other devices through the interface circuit and execute the first to third aspects, or the first aspect. From one aspect to the third aspect, the method of each embodiment.
  • the processor includes one or more.
  • the present application provides an apparatus for selecting a session management network element, including a processor, configured to be connected to a memory, and configured to call a program stored in the memory to execute the first aspect to the third aspect, or The method of each embodiment of the first aspect to the third aspect.
  • the memory can be located inside the device or outside the device.
  • the processor includes one or more.
  • the present application also provides a computer-readable storage medium having instructions stored in the computer-readable storage medium, which when run on a computer, cause a processor to execute the methods described in the foregoing aspects.
  • this application also provides a computer program product including instructions, which when run on a computer, cause the computer to execute the methods described in the above aspects.
  • the present application also provides a chip system, including a processor, configured to execute the methods described in the foregoing aspects.
  • this application provides a system for selecting a session management network element, the system including a mobility management network element and a first session management network element;
  • the mobility management network element is used to determine the first DNAI corresponding to the first session of the terminal device; and, for the first session of the terminal device, select a first session management network element that supports all or part of the first DNAI.
  • the mobility management network element is used to obtain the first information, specifically including: being used to receive the first information from the policy control network element.
  • the system further includes a policy control network element for obtaining the first DNAI corresponding to the first session of the terminal device; and sending the first DNAI corresponding to the first session to the mobility management network element.
  • a policy control network element for obtaining the first DNAI corresponding to the first session of the terminal device; and sending the first DNAI corresponding to the first session to the mobility management network element.
  • the mobility management network element is used to determine the first DNAI corresponding to the first session of the terminal device, specifically including: receiving the first DNAI corresponding to the first session from the policy control network element or other mobility management network elements.
  • the mobility management network element is configured to select the first session management that supports all or part of the first DNAI for the first session of the terminal device
  • the network element includes: for selecting and supporting all or part of the DNAI in the first DNAI for the first session of the terminal device according to the DNAI supported by the first DNAI and the first session management network element Said first session management network element.
  • the system further includes a network storage network element; the mobility management network element is further configured to obtain the DNAI supported by the first session management network element from the network storage network element.
  • the first session management network element is configured to send a registration request message to the network storage network element, and the registration request message includes the identifier of the first session management network element and the The DNAI supported by the first session management network element; and, receiving a registration response message from the network storage network element, the registration response message being used to determine that the registration is complete;
  • the network storage network element is The session management network element receives the registration request message; stores the corresponding relationship between the ID of the first session management network element and the DNAI supported by the first session management network element; and sends the message to the first session management network Meta sends the registration response message.
  • Figure 1 is a schematic diagram of a system for selecting a session management network element provided by this application
  • Figure 2A is a schematic diagram of a 5G network architecture based on a service-oriented architecture
  • Figure 2B is a schematic diagram of a 5G network architecture based on a point-to-point interface
  • FIG. 3 is a schematic flowchart of a method for selecting SMF provided by this application.
  • FIG. 4 is a schematic flow diagram of another SMF selection method provided by this application.
  • Fig. 5 is a schematic flow diagram of another SMF selection method provided by this application.
  • FIG. 6 is a schematic flow diagram of another SMF selection method provided by this application.
  • FIG. 7 is a schematic flow diagram of another SMF selection method provided by this application.
  • Fig. 8 is a schematic flow chart of an SMF registration method provided by this application.
  • Figure 9 is a schematic diagram of a device provided by this application.
  • FIG. 10 is a schematic diagram of another device provided by this application.
  • this application provides a schematic diagram of a system for selecting a session management network element.
  • the system includes a mobility management network element and a first session management network element.
  • the system also includes policy control network elements.
  • the mobility management network element is used to determine the first DNAI corresponding to the first session of the terminal device; and, for the first session of the terminal device, select a first session management network element that supports all or part of the first DNAI.
  • the mobility management network element is used to determine the first DNAI corresponding to the first session of the terminal device, including: used to obtain the first information, the first information includes the identifier of the session of the terminal device A second DNAI corresponding to the ID of the session of the terminal device, where the second DNAI is one or more DNAIs, and the ID of the session of the terminal device includes the ID of the first session; acquiring the ID of the first session; The identification and the first information determine the first DNAI corresponding to the first session.
  • the mobility management network element is also used to: obtain second information, the second information including the identifier of the first session and the third DNAI corresponding to the identifier of the first session; according to the third DNAI, Determine the fourth DNAI; select a second session management network element that supports all or part of the DNAI in the fourth DNAI for the first session of the terminal device.
  • the fourth DNAI is the same as the third DNAI; or, the fourth DNAI includes the first DNAI and the third DNAI.
  • the policy control network element is used to obtain the first information; and, the first information is sent to the mobility management network element; the mobility management network element is used to obtain the first information, which specifically includes: Receive the first information from the policy control network element.
  • the policy control network element is used to send the first information to the mobility management network element, which specifically includes: being used to send the first information to the mobility management network element during the registration process of the terminal device.
  • the mobility management network element is used to obtain the first information, which specifically includes: being used to receive the first information from other mobility management network elements.
  • the mobility management network element is used to obtain the identity of the first session, including: receiving a request message from the terminal device, the request message includes the identity of the first session, and the request message is used to request establishment The first session; or, used to receive the context information of the terminal device from other mobility management network elements, the context information includes the identifier of the first session.
  • the policy control network element is used to obtain the first DNAI corresponding to the first session of the terminal device; and send the first DNAI corresponding to the first session to the mobility management network element; mobility management The network element is used for determining the first DNAI corresponding to the first session of the terminal device, specifically including: receiving the first DNAI corresponding to the first session from the policy control network element or other mobility management network elements.
  • the mobility management network element is also used to select the third session management network element for the first session of the terminal device; the mobility management network element is used to select the first DNAI support for the first session
  • the first session management network element of all or part of the DNAI specifically including: used to determine that the third session management network element does not support all or part of the DNAI in the first DNAI, then select for the first session to support all of the DNAI in the first DNAI Or part of the first session management network element of DNAI.
  • the mobility management network element is also used to: receive the fifth DNAI corresponding to the first session from the policy control network element; determine the sixth DNAI according to the fifth DNAI; Session selection supports all or part of the fourth session management network element of the sixth DNAI.
  • the sixth DNAI is the same as the fifth DNAI; or, the sixth DNAI includes the first DNAI and the fifth DNAI.
  • the identifier of the first session includes one or more of the following: DNN, S-NSSAI.
  • the system shown in FIG. 1 further includes a network storage network element, and the mobility management network element is further configured to obtain the first session management network element support from the network storage network element DNAI.
  • the first session management network element is configured to send a registration request message to the network storage network element, and the registration request message includes the identifier of the first session management network element and the first session management network element. Meta-supported DNAI; and, receiving a registration response message from the network storage network element, the registration response message is used to confirm the completion of the registration;
  • the network storage network element is configured to receive a registration request message from the first session management network element; store the correspondence between the identification of the first session management network element and the DNAI supported by the first session management network element; and A session management network element sends a registration response message.
  • FIG. 2A it is a schematic diagram of a 5G network architecture based on a service-oriented architecture.
  • the 5G network architecture shown in FIG. 2A may include three parts, namely a terminal equipment part, a data network (DN), and an operator network part.
  • DN data network
  • Operator network part The functions of some of the network elements are briefly introduced below.
  • the operator network may include one or more of the following network elements: network exposure function (NEF) network elements, policy control function (PCF) network elements, unified data management (unified data management) , UDM) network element, network storage function (Network Repository Function, NRF) network element, application function (AF) network element, access and mobility management function (access and mobility management function, AMF) network element, session Management function (session management function, SMF) network elements, (radio) access network ((radio) access network, (R)AN), user plane function (UPF) network elements, etc.
  • NRF Network Expopository Function
  • AF application function
  • AMF access and mobility management function
  • SMF session Management function
  • R user plane function
  • UPF user plane function
  • Terminal device also known as user equipment (UE)
  • UE user equipment
  • UE is a device with wireless transceiver function, which can be deployed on land, including indoor or outdoor, handheld or vehicle-mounted; it can also be deployed on water On board (such as ships, etc.); it can also be deployed in the air (such as airplanes, balloons, satellites, etc.).
  • the terminal device may be a mobile phone (mobile phone), a tablet computer (pad), a computer with wireless transceiver function, a virtual reality (VR) terminal, an augmented reality (AR) terminal, an industrial control (industrial control) Wireless terminals in ), wireless terminals in self-driving (self-driving), wireless terminals in remote medical, wireless terminals in smart grid, wireless terminals in transportation safety (transportation safety) , Wireless terminals in smart cities, wireless terminals in smart homes, etc.
  • a mobile phone mobile phone
  • a tablet computer pad
  • a computer with wireless transceiver function a virtual reality (VR) terminal, an augmented reality (AR) terminal, an industrial control (industrial control) Wireless terminals in ), wireless terminals in self-driving (self-driving), wireless terminals in remote medical, wireless terminals in smart grid, wireless terminals in transportation safety (transportation safety) , Wireless terminals in smart cities, wireless terminals in smart homes, etc.
  • VR virtual reality
  • AR augmented reality
  • industrial control industrial
  • the above-mentioned terminal equipment can establish a connection with the operator's network through an interface (such as N1, etc.) provided by the operator's network, and use services such as data and/or voice provided by the operator's network.
  • the terminal device can also access the DN through the operator's network and use the operator's services deployed on the DN and/or the services provided by a third party.
  • the aforementioned third party may be a service party other than the operator's network and terminal equipment, and may provide other services such as data and/or voice for the terminal equipment.
  • the specific form of expression of the aforementioned third party can be determined according to actual application scenarios, and is not limited here.
  • RAN is a sub-network of an operator's network, and an implementation system between service nodes and terminal equipment in the operator's network.
  • the terminal device To access the operator's network, the terminal device first passes through the RAN, and then can be connected to the service node of the operator's network through the RAN.
  • the RAN device in this application is a device that provides wireless communication functions for terminal devices, and the RAN device is also called an access network device.
  • the RAN equipment in this application includes but is not limited to: the next generation base station (gnodeB, gNB), evolved node B (evolved node B, eNB), radio network controller (RNC), node B in 5G (node B, NB), base station controller (BSC), base transceiver station (BTS), home base station (for example, home evolved nodeB, or home node B, HNB), baseband unit (baseBand) unit, BBU), transmission point (transmitting and receiving point, TRP), transmission point (transmitting point, TP), mobile switching center, etc.
  • gnodeB next generation base station
  • gNB next generation base station
  • eNB evolved node B
  • RNC radio network controller
  • node B in 5G node B, NB
  • BSC base station controller
  • BTS base transceiver station
  • home base station for example, home evolved nodeB, or home node B, HNB
  • AMF network element is a control plane network element provided by the operator's network. It is responsible for the access control and mobility management of terminal equipment accessing the operator's network, such as mobile status management, allocation of temporary user identities, authentication and authorization of users, etc. Features.
  • the SMF network element is a control plane network element provided by the operator network and is responsible for managing the PDU session of the terminal device.
  • a PDU session is a channel used to transmit PDUs, and terminal devices need to transmit PDUs to each other through the PDU session and DN.
  • the PDU session is established, maintained, and deleted by the SMF network element.
  • SMF network elements include session management (such as session establishment, modification and release, including tunnel maintenance between UPF and AN), UPF network element selection and control, service and session continuity (Service and Session Continuity, SSC) mode selection, Session-related functions such as roaming.
  • the UPF network element is a gateway provided by an operator and a gateway for communication between the operator's network and the DN.
  • UPF network elements include user plane-related functions such as data packet routing and transmission, packet inspection, service usage reporting, quality of service (QoS) processing, lawful monitoring, uplink packet inspection, and downlink packet storage.
  • QoS quality of service
  • a DN is a network located outside the operator's network.
  • the operator's network can access multiple DNs. Multiple services can be deployed on the DN to provide data and/or voice services to terminal devices.
  • DN is the private network of a smart factory.
  • the sensors installed in the workshop of the smart factory can be terminal devices.
  • the control server of the sensor is deployed in the DN, and the control server can provide services for the sensors.
  • the sensor can communicate with the control server, obtain instructions from the control server, and transmit the collected sensor data to the control server according to the instructions.
  • a DN is an internal office network of a company.
  • the mobile phones or computers of employees of the company can be terminal devices, and the mobile phones or computers of employees can access information and data resources on the company's internal office network.
  • UDM network element is a control plane network element provided by the operator. It is responsible for storing the subscriber permanent identifier (SUPI), credential, security context, and subscription of subscribers in the operator’s network. Data and other information.
  • the information stored in UDM network elements can be used for authentication and authorization of terminal equipment accessing the operator's network.
  • the contracted users of the above-mentioned operator's network may specifically be users who use the services provided by the operator's network, such as users who use China Telecom's mobile phone core card, or users who use China Mobile's mobile phone core card.
  • the SUPI of the aforementioned subscriber can be the number of the mobile phone core card, etc.
  • the credential and security context of the aforementioned subscriber may be a small file stored such as the encryption key of the mobile phone core card or information related to the encryption of the mobile phone core card for authentication and/or authorization.
  • the aforementioned security context may be data (cookie) or token (token) stored on the user's local terminal (for example, mobile phone).
  • the contract data of the aforementioned subscriber may be the supporting service of the mobile phone core card, such as the data package of the mobile phone core card or the use of the network.
  • permanent identifiers, credentials, security contexts, authentication data (cookies), and tokens are equivalent to information related to authentication and authorization.
  • no distinction or restriction is made for the convenience of description. If no special instructions are given, the embodiments of the present application will be described using a security context as an example, but the embodiments of the present application are also applicable to authentication and/or authorization information in other expression modes.
  • NEF network elements are control plane network elements provided by operators. NEF network elements open the external interface of the operator's network to third parties in a safe manner. When the SMF network element needs to communicate with a third-party network element, the NEF network element can serve as a relay for the communication between the SMF network element and the third-party network element. When the NEF network element is used as a relay, it can be used as the translation of the identification information of the subscriber and the translation of the identification information of the third-party network element. For example, when NEF sends the SUPI of the subscriber from the operator network to the third party, it can translate the SUPI into its corresponding external identity (identity, ID). Conversely, when the NEF network element sends the external ID (third-party network element ID) to the operator's network, it can be translated into SUPI.
  • ID external identity
  • Application Function (AF) network elements mainly provide application layer services, and also support interaction with the 5G core network to provide services, such as influencing data routing decisions, policy control functions, or providing third-party services to the network side.
  • the AF network element includes an application server, and the application server refers to a third-party server.
  • the PCF network element is a control plane function provided by the operator to provide a strategy to the network element.
  • the policies may include access control policies, mobility management policies, charging-related policies, QoS-related policies, and authorization-related policies.
  • the NRF network element can be used to provide the network element discovery function, and provide the network element information corresponding to the network element type based on the request of other network elements.
  • NRF also provides network element management services, such as network element registration, update, de-registration, and network element status subscription and push.
  • Nnef, Npcf, Nudm, Naf, Namf, Nsmf, N1, N2, N3, N4, and N6 are interface serial numbers.
  • the meaning of these interface serial numbers can be referred to the meaning defined in the 3rd generation partnership project (3rd generation partnership project, 3GPP) standard protocol, which is not limited here.
  • FIG. 2B it is a schematic diagram of a 5G network architecture based on a point-to-point interface.
  • the interfaces between the various network elements in FIG. 2B are point-to-point interfaces rather than service-oriented interfaces.
  • the interface between the UE and the AMF network element is called the N1 interface
  • the interface between the AMF network element and the RAN device is called the N2 interface
  • the interface between the RAN device and the UPF network element It can be called N3 interface
  • the interface between SMF network element and UPF network element is called N4 interface
  • the interface between PCF network element and AF network element is called N5 interface
  • the interface between UPF network element and DN is called N6 Interface
  • the interface between SMF network element and PCF network element is called N7 interface
  • the interface between AMF network element and UDM network element is called N8 interface
  • the interface between different UPF network elements is called N9 interface
  • UDM network element The interface with the SMF network element is called the N10 interface
  • the interface between the AMF network element and the SMF network element is called the N11 interface
  • the interface between different AMF network elements is called the N14 interface
  • the one between the AMF network element and the PCF network element The interface between is called N15 interface.
  • the foregoing network elements or functions may be network elements in hardware devices, software functions running on dedicated hardware, or virtualization functions instantiated on a platform (for example, a cloud platform).
  • a platform for example, a cloud platform.
  • the foregoing network element or function may be implemented by one device, or jointly implemented by multiple devices, or may be a functional module in one device, which is not specifically limited in the embodiment of the present application.
  • the mobility management network element, session management network element, policy control network element, application function network element, access network device, and network storage network element in this application may be AMF, SMF, PCF, and SMF in FIG. 2A or FIG. 2B, respectively.
  • AF, RAN, and NRF may also be network elements that have the above-mentioned AMF, SMF, PCF, AF, RAN, and NRF functions in future communications such as the 6th generation (6G) network, which is not limited in this application.
  • 6G 6th generation
  • this application uses mobility management network elements, session management network elements, policy control network elements, application function network elements, access network equipment, and network storage network elements as the aforementioned AMF, SMF, PCF, AF, RAN, Take NRF as an example.
  • the terminal device is referred to as UE for short in this application.
  • the network can select the UPF that accesses the data network as the PDU Session Anchor (PSA) according to the network policy, and access the AF through the N6 interface of the PSA.
  • PSA PDU Session Anchor
  • the AF of the same application can be deployed in multiple locations, so that the network can select a PSA that is close to the UE and supports the UE's access to the data network according to the UE's access location, so as to reduce circuitous routes and reduce network delay.
  • the PSA reselection method is: AF sends a request message to SMF.
  • the request message includes a data network access identifier (DNAI).
  • DNAI is used to identify local access to the data network.
  • the SMF selects the UPF that supports the DNAI in the request message as the PSA.
  • the UPF managed by the SMF may not support all or most of the DNAI that the UE can access, resulting in failure to select a suitable PSA for the UE so that the UE can access nearby AF.
  • the present application provides a method for selecting an SMF, which includes the following steps:
  • Step 301 The AMF determines the first DNAI corresponding to the first session of the UE.
  • Step 302 The AMF selects the first SMF supporting all or part of the DNAI in the first DNAI for the first session of the UE.
  • the selected first SMF is a newly added SMF, and therefore can be called the first I-SMF.
  • the second SMF, the third SMF, and the fourth SMF that appear subsequently may be called the second I-SMF, the third I-SMF, and the fourth I-SMF, respectively.
  • I-SMF is the abbreviation for intermediate SMF.
  • the DNAI in this application can be considered as the location information of the data access network.
  • the AF can request the data routing access point to be in a specific location (the application deploys the AF at that location), that is, it is hoped that the user's data stream of the application can be accessed to that location. AF.
  • the AMF selects an SMF for the UE.
  • the SMF supports all or part of the DNAI in the first DNAI, so the UPF selected by the SMF also supports all or part of the DNAI in the first DNAI, that is, the SMF is responsible for the association and support of the first DNAI
  • the UPF of part or all of the DNAI in the first DNAI corresponding to the session realizes the selection of a suitable SMF for the UE. Further, through the selected SMF, it is possible to select a UPF supporting the DNAI corresponding to the first session as the PSA for the UE, thereby reducing circuitous routing and reducing network delay.
  • Implementation method 1 During the registration process of the UE, the AMF obtains the DNAI information related to the UE; during the session establishment process of the UE, the AMF selects the first SMF for the UE.
  • the AMF obtains the DNAI information related to the UE.
  • the AMF obtains the first information during the registration process of the UE, and the first information is related to the UE.
  • the first information includes the identity of the UE’s session and the second DNAI corresponding to the identity of the UE’s session.
  • the second DNAI is one or more DNAIs.
  • the identity of the UE’s session includes the identity of the first session. .
  • the first information here includes one or more sets of correspondences, and each set of correspondences refers to the correspondence between the session identifier of the UE and at least one DNAI (ie, the second DNAI). That is, the first information includes one or more session identifiers, each session identifier corresponds to a second DNAI, the second DNAI refers to one or more DNAI, and one or more of the first information
  • the identifier of the session includes the identifier of the first session. Therefore, the second DNAI corresponding to the identifier of the first session in the first information is the above-mentioned first DNAI, or understood as the above-mentioned first DNAI as the second DNAI corresponding to the identifier of the first session in the first information. DNAI.
  • the session identifier includes DNN and single network slice selection assistance information (single network slice selection assistance information, S-NSSAI) as an example, and each row represents a set of correspondences .
  • S-NSSAI single network slice selection assistance information
  • the AMF may obtain the above-mentioned first information from the PCF during the registration process of the UE, or obtain the above-mentioned first information from other AMFs (such as the AMF that provides services for the UE before the UE moves).
  • the AMF can obtain the identity of the first session during the session establishment process. For example, the AMF can receive a request message from the UE, the request message includes the identity of the first session, and the request message is used to request the establishment of the first session; or , The AMF receives the context information of the UE from other AMFs (such as the AMF that provides services for the UE before the UE moves), and the context information includes the identity of the first session.
  • the AMF receives the context information of the UE from other AMFs (such as the AMF that provides services for the UE before the UE moves), and the context information includes the identity of the first session.
  • the AMF may determine the first DNAI corresponding to the first session according to the identifier of the first session and the above-mentioned first information.
  • the identifier of the first session is DNN1, S-NSSAI1 in Table 1, and the AMF can obtain the first DNAI corresponding to the identifier of the first session according to Table 1 above, including DNAI1 and DNAI2.
  • the AMF can select an SMF that supports DNAI1 and DNAI2 for the UE. For example, if there is an SMF that supports both DNAI1 and DNAI2, this SMF is selected as the first SMF. Of course, if there is no SMF that supports both DNAI1 and DNAI2, the SMF that supports DNAI1 or DNAI2 can be selected as the first SMF for the UE.
  • the SMF can select a UPF for the UE. Since the first SMF supports some or all of the DNAI in the first DNAI, the selected UPF also supports some or all of the DNAI in the first DNAI. Therefore, the UPF selected for the UE can be used as the PSA.
  • the PCF may also notify the AMF to update. For example, the PCF may send second information to the AMF.
  • the second information is DNAI information related to the UE.
  • the second information includes at least one DNAI corresponding to the UE’s session identifier and the UE’s session identifier.
  • the information includes the identifier of the first session and the third DNAI corresponding to the identifier of the first session.
  • the second information may be notified to the AMF in a full update manner or an incremental update manner.
  • the AMF can replace the first information with the second information, or it can be understood that the AMF deletes the first information and stores the second information as the latest DNAI information.
  • incremental update AMF merges the first information and the second information, or understands that AMF deduplicates the first information and the second information and stores them. Therefore, the saved DNAI information contains both the first information and the second information. Two information. The two different update methods are explained below.
  • the second information sent by the PCF to the AMF includes the latest DNAI information.
  • the latest DNAI information may be based on the above first information for adding one or more sessions.
  • the corresponding relationship between the identifier and DNAI (refer to the example in Table 2), or it can also be the modification of the above-mentioned first information (refer to the example in Table 3), or it can also be the addition and modification of the above-mentioned first information at the same time (Refer to Table 4 for examples).
  • the DNAI corresponding to the ID of the first session has not changed, and is still DNAI1 and DNAI2. Therefore, the third DNAI corresponding to the first session in the second message is identical to the The first DNAI corresponding to the session in the first message is the same.
  • the AMF After the AMF obtains the second information, it can determine the fourth DNAI according to the third DNAI corresponding to the first session in the second information, and the fourth DNAI and the third DNAI Similarly, the fourth DNAI refers to the latest DNAI corresponding to the first session.
  • the fourth DNAI includes DNAI1 and DNAI2
  • the fourth DNAI includes DNAI1 and DNAI4.
  • the second information sent by the PCF to the AMF may be newly added DNAI information based on the foregoing first information.
  • the third DNAI corresponding to the first session includes DNAI4, that is, the DNAI corresponding to the first session adds DNAI4.
  • the AMF can, based on the third DNAI corresponding to the first session in the second information and the first DNAI corresponding to the first session in the first information, Determine the fourth DNAI, the fourth DNAI includes the first DNAI and the third DNAI, and the fourth DNAI refers to the latest DNAI corresponding to the first session. For example, combining Table 1 and Table 5, it can be determined that the fourth DNAI corresponding to the first session includes DNAI1, DNAI2, and DNAI4.
  • the AMF After the AMF obtains the latest DNAI corresponding to the first session through full update or incremental update, that is, the fourth DNAI, it can select the second SMF that supports all or part of the fourth DNAI for the first session of the UE. . If the second SMF is different from the first SMF, the second SMF is taken as the latest SMF. If the second SMF is the same as the first SMF, no update is required.
  • Implementation method 2 In the process of establishing a session of the UE, the AMF first selects an SMF (referred to as the third SMF), and then the AMF obtains DNAI information related to the UE's session, and reselects the first SMF for the UE according to the DNAI information.
  • SMF SMF
  • the AMF obtains DNAI information related to the UE's session, and reselects the first SMF for the UE according to the DNAI information.
  • the AMF selects the third SMF. For example, during the session establishment process of the UE, the AMF may select the third SMF for the first session of the UE according to the location information of the UE. .
  • the third SMF may select the third SMF for the first session of the UE according to the location information of the UE.
  • other methods can also be used to select the third SMF, and this application does not limit the method for AMF to select the third SMF.
  • the DNAI information related to the session of the UE can be subsequently followed. For example, during the establishment of the first session, the UE obtains DNAI information related to the first session from the PCF or other AMFs (such as the AMF that provides services for the UE before the UE moves), that is, the first DNAI corresponding to the first session. Therefore, if the AMF determines that the third SMF does not support all or part of the DNAI in the first DNAI, it selects the first SMF that supports all or part of the DNAI in the first DNAI for the first session.
  • the AMF determines that the third SMF does not support all or part of the DNAI in the first DNAI, it selects the first SMF that supports all or part of the DNAI in the first DNAI for the first session.
  • AMF can first select a third SMF for the UE regardless of DNAI. If it is determined that the third SMF does not support part or all of the DNAI in the first DNAI corresponding to the first session, then the The UE reselects an SMF that supports part or all of the DNAI in the first DNAI corresponding to the first session, that is, the first SMF.
  • the PCF in the subsequent modification process of the first session of the UE, if the DNAI corresponding to the first session changes, for example, the latest DNAI corresponding to the first session is the fifth DNAI, then the PCF can In the session update process, the fifth DNAI corresponding to the first session is sent to the AMF, and then the AMF determines the sixth DNAI according to the fifth DNAI, which is the latest DNAI corresponding to the first session.
  • the update is performed in a full update manner
  • the sixth DNAI is the same as the fifth DNAI; if the update is performed in an incremental update manner, the sixth DNAI includes the first DNAI and the fifth DNAI.
  • a fourth SMF that supports all or part of the DNAI in the sixth DNAI may be selected for the first session of the UE. If the fourth SMF is different from the current SMF (that is, the first SMF or the aforementioned second SMF), the fourth SMF is taken as the latest SMF. If the fourth SMF is the same as the current SMF, no update is required.
  • the difference between the above two methods for the PCF to send updated DNAI information to the AMF is: the first method (based on the method for sending updated DNAI information described in the implementation method 1 above) is that the PCF sends the UE to the AMF Granular DNAI information related to the UE’s session (ie, the above-mentioned second information).
  • the second information includes not only the identity of the first session and the DNAI corresponding to the identity of the first session, but also the identity and identity of other sessions of the UE.
  • Corresponding DNAI; and the second method (based on the method of sending updated DNAI information described in the implementation method 2 above) is that the PCF only sends the latest DNAI corresponding to the first session to the AMF during the session modification process. There is no need to send the identification of the first session, nor the identification of other sessions of the UE and the corresponding DNAI.
  • New AMF refers to the AMF currently serving the UE
  • Old AMF refers to the AMF previously serving the UE
  • the context information of the UE can be stored on the Old AMF.
  • New AMF refers to the AMF that serves the UE when the UE is in the position after the movement
  • Old AMF refers to the service that the UE is in the position before the movement.
  • AMF may also be called new AMF
  • Old AMF may also be called old AMF or original AMF.
  • AM-PCF is divided into AM-PCF and SM-PCF.
  • AM-PCF is used to provide access control and mobility management strategies to AMF and UE strategies to UE
  • SM-PCF is used to provide session management related strategies to SMF.
  • AM-PCF and SM-PCF can be deployed together on the same physical device, or can be separately deployed on different physical devices, which is not limited in this application.
  • this application provides yet another SMF selection method.
  • the method describes that in the registration process of the UE, New AMF receives DNAI information related to the UE from the PCF or Old AMF, and the process of establishing a PDU session In, New AMF selects I-SMF according to the DNAI corresponding to the established session in the DNAI information.
  • the method includes the following steps:
  • Step 401 The UE sends an Initial Registration Request (Initial Registration Request) message to the RAN, which carries the identity of the UE (such as a temporary identity, etc.). Accordingly, the RAN can receive the initial registration request message.
  • Initial Registration Request Initial Registration Request
  • Step 402 The RAN sends an initial registration request message to the New AMF, which carries the identity of the UE (such as a temporary identity, etc.).
  • New AMF can receive the initial registration request message.
  • Step 403 If the initial registration request message carries a temporary identifier, New AMF obtains the UE context from Old AMF, and if the UE context already includes DNAI information related to the UE, Old AMF sends the DNAI information to New AMF.
  • the DNAI information here includes one or more sets of correspondence, and each set of correspondence refers to the correspondence between the session identifier and at least one DNAI.
  • the DNAI information related to the UE here is the first information in the foregoing embodiment.
  • New AMF may send Naf_Communication_UEContextTransferrequest to Old AMF, and Old AMF may send New AMFNaf_Communication_UEContextTransfer response to New AMFNaf_Communication_UEContextTransfer response, which carries the UE context, and the UE context includes DNAI information related to the UE.
  • This step 403 is optional.
  • Step 404 The New AMF sends a registration completion notification message to the Old AMF.
  • Old AMF can receive the registration completion notification message.
  • This step 404 is optional.
  • Step 405 New AMF registers with UDM, obtains user subscription data, and subscribes to user data change notifications.
  • This step 405 is optional.
  • Step 406 Old AMF registers with UDM and unsubscribes the subscription data change notification.
  • This step 406 is optional.
  • Step 407 New AMF sends a policy control request message to AM-PCF, which carries the SUPI and the list of internal group identifiers to which the UE belongs.
  • AM-PCF can receive the policy control request message.
  • the aforementioned policy control request message may be an Npcf_AMPolicyControl_Create Request message.
  • Step 408 The AM-PCF interacts with the UDR, and obtains the subscription information of the UE and the related AF influence-oriented decision-making information from the UDR.
  • the information includes DNAI information related to the UE.
  • the AM-PCF can send a query request message to the UDR, and then the UDR sends a query response message to the AM-PCF.
  • the query response message includes DNAI information related to the UE, and may further include UE subscription information.
  • the foregoing query request message may be a NUDr_DM_Query Request message
  • the foregoing query response message may be a NUDr_DM_Query Response message.
  • the DNAI information related to the UE here is the same as the description of the DNAI information related to the UE in step 403, and reference may be made to the foregoing description.
  • step 403 there is no need to obtain the DNAI information related to the UE in this step 408; if the DNAI information related to the UE cannot be obtained through step 403, Then, the DNAI information related to the UE can be obtained in step 408.
  • Step 409 AM-PCF sends a policy control response message to New AMF.
  • New AMF can receive the policy control response message.
  • the policy control response message includes the aforementioned DNAI information related to the UE.
  • the above policy control response message may be an Npcf_AMPolicyControl_Create Response message.
  • Step 410 New AMF sends a registration acceptance (Registration Accept) message to the UE.
  • the UE can receive the registration acceptance message.
  • Step 411 The UE sends a Registration Complete (Registration Complete) message to the New AMF through the RAN.
  • New AMF can receive the registration completion message.
  • the UE can obtain the DNAI information related to the UE from Old AMF or AM-PCF, and the DNAI information is UE granular.
  • I-SMF supporting DNAI is selected for the UE.
  • Step 412 The UE sends a session establishment request message to New AMF, where the message is used to request the establishment of a PDU session.
  • New AMF can receive the session establishment request message.
  • the session establishment request message carries an identifier of the first session, and the identifier of the first session may include DNN and S-NSSAI.
  • Step 413 New AMF determines that an I-SMF needs to be inserted according to the current location of the UE, then selects an I-SMF and sends a context establishment request message to the selected I-SMF, and then the I-SMF sends a context establishment response message to New AMF .
  • the context establishment request message here may be, for example, the Nsmf_PDUSession_CreateSMContext Request message
  • the context establishment response message may be, for example, the Nsmf_PDUSession_CreateSMContext Response message.
  • New AMF determines the first DNAI corresponding to the first session according to the identity of the first session of the UE and the obtained DNAI information, and then selects an SMF that supports part or all of the DNAI in the first DNAI as the I -SMF.
  • the identifier of the first session in the session establishment request message in step 412 is DNN1, S-NSSAI2, and New AMF obtains the UE-related DNAI information from Old AMF or AM-PCF. Take the above Table 1 as an example. Then New AMF can determine that the DNAI corresponding to DNN1 and S-NSSAI2 includes DNAI1 and DNAI3, and then New AMF selects an SMF that supports DNAI1 and/or DNAI3 as the I-SMF.
  • the SMF can be used as I-SMF. If there is no SMF that supports both DNAI1 and DNAI3, one SMF that supports DNAI1 or DNAI3 can be selected as I-SMF.
  • New AMF can know which SMF supports the DNAI corresponding to the session through pre-configuration or through NRF query, that is, the New AMF is pre-configured with DNAI supported by one or more SMFs managed by the New AMF, or in the NRF
  • the DNAI managed by the New AMF and the DNAI supported by one or more SMFs managed by other AMFs are stored.
  • Step 414 The I-SMF selects a UPF, and sends an N4 session establishment request message to the UPF, and the UPF returns an N4 session establishment response message to the I-SMF.
  • the UPF here is the UPF serving as the PSA, and the UPF also supports the DNAI corresponding to the session, so that a PSA that supports the DNAI corresponding to the session is selected for the UE session.
  • Step 415 The I-SMF sends a session establishment request message to the SMF.
  • the SMF can receive the session establishment request message.
  • the session establishment request message may be an Nsmf_PDUSession_Create Request message, for example.
  • Step 416 SMF registers with UDM, obtains user subscription data, and subscribes to user data change notifications.
  • Step 417 The SMF sends a policy control request message to the SM-PCF.
  • the SM-PCF can receive the policy control request message.
  • the policy control request message may be an Npcf_SMPolicyControl_Create Request message, for example.
  • Step 418 the SM-PCF interacts with the UDR to obtain the user's policy signing information.
  • the SM-PCF may send a query request message to the UDR, and then the UDR sends a query response message to the SM-PCF.
  • the query response message includes the user's policy subscription information.
  • the foregoing query request message may be a NUDr_DM_Query Request message
  • the foregoing query response message may be a NUDr_DM_Query Response message.
  • Step 419 After the SM-PCF executes the policy, it sends a policy control response message to the SMF. Correspondingly, the SMF can receive the policy control response message.
  • the policy control response message may be, for example, a Npcf_SMPolicyControl_Create Response message.
  • Step 420 The SMF sends a session establishment response message to the I-SMF.
  • the SMF can receive the session establishment response message.
  • the session establishment response message may be, for example, an Nsmf_PDUSession_Create Response message.
  • Step 421 the I-SMF sends an information delivery message to the AMF, and the AMF returns an information delivery response message to the I-SMF.
  • the information transfer message may be Namf_Communication_N1N2MessageTransfer message, for example.
  • Step 422 the AMF continues to complete the subsequent PDU session establishment process.
  • AMF obtains the DNAI information related to the UE from the PCF (such as the above AM-PCF) or other AMF (such as the above Old AMF), and determines the established PDU session according to the session identifier when the UE establishes a PDU session
  • the corresponding first DNAI and then select the I-SMF that supports part or all of the DNAI in the first DNAI, and then the I-SMF selects the UPF. Since the I-SMF supports the first DNAI, the selected UPF also supports the The first DNAI, so that the UPF can be used as the PSA, which realizes the selection of a suitable PSA for the UE, that is, a PSA that supports the DNAI corresponding to the session is selected.
  • the movement of the UE will lead to the handover of the first session accompanied by the AMF reselection.
  • the target AMF obtains the DNAI information related to the UE and the identity of the first session from the source AMF.
  • the target AMF determines the first DNAI corresponding to the identifier of the first session, and then selects an SMF that supports part or all of the DNAI in the first DNAI as the I-SMF.
  • the target AMF obtains the first DNAI corresponding to the first session from the source AMF, and then selects an SMF that supports part or all of the DNAI in the first DNAI as the I-SMF.
  • Step 501-Step 505 can be performed at any time
  • Step 506-Step 508 It is executed after the above step 422.
  • the AMF obtains the DNAI information related to the UE during the registration process of the UE, during the session, obtains the updated DNAI information from the AM-PCF, and can then select a new one based on the updated DNAI information I-SMF (that is, New I-SMF in Figure 5).
  • the Old I-SMF in this embodiment may be the I-SMF in the embodiment of FIG. 4 described above.
  • the method includes the following steps:
  • Step 501 AF sends a request message to NEF.
  • NEF can receive the request message.
  • the request message carries traffic steering information (Traffic Steering Information), and Traffic Steering Information can carry an external group ID or indication information.
  • the external group ID is used to indicate that the Traffic Steering Information is applicable to one or more UEs corresponding to the external group ID.
  • the indication information is used to indicate that the Traffic Steering Information is applicable to all UEs.
  • the Traffic Steering Information also carries DNAI information, and the DNAI information includes one or more sets of correspondences, and each set of correspondences is a correspondence between a session identifier of the UE and at least one DNAI.
  • the request message may be a Nnef_TrafficInfluence_Create Request message, for example.
  • step 502 the NEF sends a request message to the UDR, and the request message carries Traffic Steering Information. Accordingly, the UDR can receive the request message.
  • the request message may be a Nudr_DataRepository_Create Request message.
  • NEF also needs to map the external group ID to an internal group ID, that is, the Traffic Steering Information sent by NEF to UDR carries the internal group ID and DNAI information.
  • Traffic Steering Information carries indication information
  • the Traffic Steering Information sent by NEF to UDR carries the indication information and DNAI information.
  • Step 503 UDR stores DNAI information and returns a response message to NEF. Accordingly, NEF can receive the response message.
  • the response message may be, for example, a Nudr_DataRepository_Create Response message.
  • UDR stores the corresponding relationship between the internal group ID and DNAI information; or UDR first determines the identity of the UE corresponding to the internal group ID based on the internal group ID, and then stores the UE ID and DNAI Correspondence of information.
  • Traffic Steering Information carries indication information
  • the UDR stores the DNAI information without being associated with the UE, indicating that the DNAI information is applicable to all UEs.
  • Step 504 NEF sends a response message to AF.
  • the AF can receive the corresponding message.
  • the response message may be, for example, a Nnef_TrafficInfluence_Create Response message.
  • This step 504 is optional.
  • Step 505 The UDR sends a notification message to all subscribed AM-PCFs, and the notification message carries Traffic Steering Information.
  • AM-PCF can receive the notification message.
  • Step 506 The AM-PCF sends a policy control update request message to the AMF, and the message carries DNAI information.
  • the AMF can receive the policy control update request message.
  • the DNAI information carried in the message is the second information described in the foregoing embodiment.
  • the second information may be the information corresponding to the incremental update mode, or the corresponding information in the full update mode. For details, refer to the foregoing description.
  • the policy control update request message may be, for example, an NPcf_AMPolicyControl_UpdateNotify Request message.
  • the AM-PCF performs this step for the UE corresponding to the internal group identifier. If the Traffic Steering Information carries indication information, the AM-PCF performs this step for all UEs.
  • AMF obtains the updated DNAI information according to the currently saved DNAI information (ie the first information described in the above embodiment) and the DNAI information received from AM-PCF (ie the second information described in the above embodiment) DNAI information and save it.
  • the AMF will save the DNAI information received from the AM-PCF (that is, the second information described in the above embodiment) as the updated DNAI information.
  • Step 507 The AMF sends a policy control update response message to the AM-PCF.
  • AM-PCF can receive the policy control update response message.
  • the policy control update response message may be, for example, an NPcf_AMPolicyControl_UpdateNotify Response message.
  • step 508 the AMF reselects the I-SMF according to the updated DNAI information.
  • the AMF determines the first DNAI corresponding to the first session in the updated DNAI information according to the identifier of the first session, and then selects an I-SMF that supports part or all of the DNAI in the first DNAI. That is, the I-SMF before the reselection is the Old I-SMF shown in FIG. 5, and the I-SMF after the reselection is the New I-SMF shown in FIG. 5.
  • the AMF can obtain updated DNAI information during the PDU session, and reselect the I-SMF according to the updated DNAI information, so as to realize the selection of a suitable I-SMF for the UE.
  • the AMF first selects an SMF (ie I-SMF1) for the UE, and then obtains the corresponding SMF for the first session. After DNAI, select an SMF corresponding to the first session (i.e., I-SMF2) for the UE again.
  • I-SMF1 here is the third SMF in the foregoing embodiment
  • I-SMF2 is the first SMF in the foregoing embodiment.
  • the method includes the following steps:
  • step 601 the UE registers with the network.
  • Step 602 The UE sends a session establishment request message to New AMF.
  • New AMF can receive the session establishment request message.
  • the session establishment request message carries an identifier of the first session, and the identifier of the first session may include DNN and S-NSSAI.
  • the AMF determines that the I-SMF needs to be inserted according to the current location of the UE, and the AMF obtains the I-SMF1 serving the current location of the UE according to the configuration or through the NRF query.
  • the AMF sends a context establishment request message to the selected I-SMF1, and the message carries the DNN, S-NSSAI, user ID, and internal group ID to which the UE belongs.
  • I-SMF1 sends a context response message to AMF.
  • the context establishment request message may be a Nsmf_PDUSession_CreateSMContext Request message.
  • the context establishment response message may be a Nsmf_PDUSession_CreateSMContext Response message.
  • step 604 after I-SMF1 selects UPF1, it sends an N4 session establishment request message to UPF1, and UPF1 sends an N4 session establishment response message to I-SMF1.
  • the I-SMF1 sends a session establishment request message to the SMF.
  • the message carries the DNN, S-NSSAI, user ID, and internal group ID to which the UE belongs.
  • the SMF can receive the session establishment request message.
  • the session establishment request message may be an Nsmf_PDUSession_Create Request message, for example.
  • Step 606 The SMF registers with UDM, obtains user subscription data, and subscribes to user data change notifications.
  • Step 607 The SMF sends a policy control request message to the SM-PCF.
  • the SM-PCF can receive the policy control request message.
  • the policy control request message carries DNN, S-NSSAI, user ID, and internal group ID to which the UE belongs.
  • the policy control request message may be an Npcf_SMPolicyControl_Create Request message, for example.
  • Step 608 the SM-PCF interacts with the UDR to obtain the user's policy signing information.
  • the SM-PCF may send a query request message to the UDR, and then the UDR sends a query response message to the SM-PCF.
  • the query response message includes the user's policy subscription information.
  • the foregoing query request message may be a NUDr_DM_Query Request message
  • the foregoing query response message may be a NUDr_DM_Query Response message.
  • Step 609 After the SM-PCF executes the policy, it sends a policy control response message to the SMF. Correspondingly, the SMF can receive the policy control response message.
  • the policy control response message may be, for example, a Npcf_SMPolicyControl_Create Response message.
  • the PCF formulates one or more PCC rules for Traffic Steering control.
  • the Traffic steering control information in each PCC rule includes DNAI information.
  • the DNAI information here refers to the DNAI corresponding to the first session, or it is referred to as the first session.
  • the DNAI corresponding to the session ID is referred to as the first session.
  • Step 610 The SMF determines the DNAI corresponding to the first session according to the DNAI information included in the Traffic steering control information in each PCC rule.
  • the SMF sends a session establishment response message to I-SMF1, and the message carries the DNAI corresponding to the first session.
  • I-SMF1 can receive the session establishment response message.
  • the policy control response message may be, for example, a Npcf_SMPolicyControl_Create Response message.
  • Step 611 I-SMF1 sends an information transfer message to AMF, and AMF returns an information transfer response message to I-SMF1.
  • the information transfer message may be Namf_Communication_N1N2MessageTransfer message, for example.
  • Step 612 the AMF sends an N2 session request message to the RAN.
  • the RAN can receive the N2 session request message.
  • Step 613 The RAN interacts with the UE to establish an RRC connection.
  • Step 614 The RAN returns an N2 session response message to New AMF.
  • New AMF can receive the N2 session response message.
  • Step 615 New AMF sends an update context request message to I-SMF1.
  • I-SMF1 can receive the update context request message.
  • the update context request message may be a Nsmf_PDUSession_UpdateSMcontext Request message.
  • Step 616 I-SMF1 updates the N4 session.
  • Step 617 I-SMF1 returns an update context response message to New AMF.
  • New AMF can receive the update context response message.
  • the update context response message may be, for example, a Nsmf_PDUSession_UpdateSMcontext Response message.
  • the update context response message includes the DNAI corresponding to the first session.
  • Step 618 New AMF saves the DNAI corresponding to the first session, and reselects the I-SMF according to the DNAI corresponding to the first session.
  • AMF selects an I-SMF (ie, I-SMF2) that supports all or part of DNAI according to the DNAI corresponding to the first session.
  • I-SMF2 an I-SMF that supports all or part of DNAI according to the DNAI corresponding to the first session.
  • New AMF can obtain the I-SMF supporting the DNAI corresponding to the first session according to the configuration or through the NRF query.
  • the reselected SMF is I-SMF2, and the I-SMF2 can select a new UPF (UPF2 as shown in the figure) as the PSA. Since the I-SMF2 supports the aforementioned DNAI, the selected UPF2 also supports the DNAI, so that the UPF2 can be used as a PSA to realize the selection of a suitable PSA for the UE, that is, a PSA that supports the DNAI corresponding to the session identifier is selected.
  • a PSA that supports the DNAI corresponding to the session identifier is selected.
  • steps 701-705 and the following step 706 are alternatives, that is, perform the following steps 701-705, and step 707-711 (for ongoing or future PDU sessions), or perform the following steps 706-Step 711 (for the ongoing PDU session).
  • the method includes the following steps:
  • Step 701 AF sends a request message to NEF.
  • NEF can receive the request message.
  • the request message carries Traffic Steering Information
  • Traffic Steering Information can carry an external group ID or indication information.
  • the external group ID is used to indicate that the Traffic Steering Information is applicable to one or more UEs corresponding to the external group ID.
  • the indication information is used It indicates that the Traffic Steering Information is applicable to all UEs.
  • the Traffic Steering Information also carries DNAI information, and the DNAI information includes the DNAI corresponding to the first session.
  • the request message may be a Nnef_TrafficInfluence_Create Request message, for example.
  • Step 702 NEF sends a request message to UDR, and the request message carries Traffic Steering Information. Accordingly, the UDR can receive the request message.
  • the request message may be a Nudr_DataRepository_Create Request message.
  • NEF also needs to map the external group ID to an internal group ID, that is, the Traffic Steering Information sent by NEF to the UDR carries the internal group ID and the aforementioned DNAI information.
  • Traffic Steering Information sent by NEF to UDR carries the instruction information and DNAI information.
  • step 703 the UDR stores the DNAI information and returns a response message to the NEF. Accordingly, NEF can receive the response message.
  • the response message may be, for example, a Nudr_DataRepository_Create Response message.
  • UDR stores the corresponding relationship between the internal group ID and DNAI information; or UDR first determines the identity of the UE corresponding to the internal group ID based on the internal group ID, and then stores the UE ID and DNAI Correspondence of information.
  • Traffic Steering Information carries indication information
  • the UDR stores the DNAI information without being associated with the UE, indicating that the DNAI information is applicable to all UEs.
  • Step 704 NEF sends a response message to AF.
  • the AF can receive the corresponding message.
  • the response message may be, for example, a Nnef_TrafficInfluence_Create Response message.
  • This step 704 is optional.
  • Step 705 The UDR sends a notification message to all subscribed SM-PCFs, and the notification message carries Traffic Steering Information.
  • SM-PCF can receive the notification message.
  • Step 706 The AF sends a policy authorization message to the SM-PCF, where the message includes Traffic steering information, and the Traffic steering information carries the DNAI corresponding to the first session.
  • the SM-PCF can receive the Traffic steering information.
  • the policy authorization message may be, for example, a Npcf_Policy Authorziation message.
  • AF can send policy authorization messages to SM-PCF through NEF.
  • the SM-PCF formulates PCC rules according to Traffic Steering Information provided by the AF, and the PCC rules include Traffic Steering Information.
  • the SM-PCF sends a policy control update request message to the SMF, and the message carries the update PCC rule.
  • SMF saves the PCC rules and returns a policy control update response message.
  • the policy control update request message may be, for example, an NPcf_AMPolicyControl_UpdateNotify Request message.
  • the policy control update response message may be, for example, an NPcf_AMPolicyControl_UpdateNotify Response message.
  • the SM-PCF performs this step for the UE corresponding to the group identifier. If the Traffic Steering Information carries indication information, the SM-PCF performs this step for all UEs.
  • Step 708 The SMF determines the DNAI corresponding to the first session according to Traffic Steering Information in the PCC rules, and sends a session update request message to the Old I-SMF, which carries the updated DNAI.
  • the Old I-SMF can receive the session update request message.
  • the updated DNAI here includes all DNAIs corresponding to the first session. If it is an incremental update, the updated DNAI here includes the newly added DNAI corresponding to the first session.
  • Step 709 The Old I-SMF sends an update context request message to the AMF, which carries the updated DNAI.
  • the AMF can receive the update context request message.
  • the update context request message may be a Nsmf_PDUSession_UpdateSMContext Request message.
  • Step 710 The Old I-SMF sends a session update response message to the SMF.
  • the Old I-SMF can receive the session update response message.
  • This step is optional.
  • step 711 the AMF reselects the I-SMF according to the updated DNAI.
  • the AMF determines the latest DNAI corresponding to the first session according to the updated DNAI, and then selects an I-SMF that supports some or all of the DNAI in the latest DNAI. That is, the I-SMF before the reselection is the Old I-SMF shown in FIG. 7, and the I-SMF after the reselection is the New I-SMF shown in FIG. 7.
  • the selected New I-UPF also supports the DNAI, so that the New I-UPF can be used as the PSA to realize the selection of the appropriate PSA for the UE, that is, the identification of the support and session is selected PSA corresponding to DNAI.
  • this application also provides an SMF registration method.
  • the I-SMF can send its own DNAI to the NRF during the registration process with the NRF, so that the AMF can learn about each I-SMF. Support DNAI separately. That is, this embodiment can be combined with the embodiments shown in FIGS. 4-7.
  • the I-SMF may be the first SMF, the second SMF, the fourth SMF, etc. in the foregoing embodiment.
  • the method includes the following steps:
  • the I-SMF sends a registration request message to the NRF.
  • the registration request message includes the SMF identifier and the DNAI supported by the SMF.
  • the NRF can receive the registration request message.
  • the registration request message may be, for example, the Nnrf_NFManagement_NFRegister Request message.
  • the registration request message may carry the NF profile of the I-SMF, and the NF profile includes the DNAI supported by the I-SMF.
  • step 802 the NRF stores the corresponding relationship between the SMF identifier and the DNAI supported by the SMF.
  • the NRF stores the NF profile.
  • step 803 the NRF sends a registration response message to the SMF, and the registration response message is used to determine the completion of the registration.
  • the NRF can receive the registration response message.
  • the registration request message may be, for example, a Nnrf_NFfManagement_NFRegister_Response message.
  • the NRF obtains the DNAI supported by the I-SMF so that the AMF can query the DNAI supported by the I-SMF.
  • each network element described above includes hardware structures and/or software modules corresponding to each function.
  • the present invention can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed by hardware or computer software-driven hardware depends on the specific application and design constraint conditions of the technical solution. Professionals and technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered as going beyond the scope of the present invention.
  • the apparatus 900 may exist in the form of software or hardware.
  • the apparatus 900 may include: a processing unit 902 and a communication unit 901.
  • the communication unit 901 may include a receiving unit and a sending unit.
  • the processing unit 902 is used to control and manage the actions of the device 900.
  • the communication unit 901 is used to support communication between the device 900 and other network entities.
  • the processing unit 902 may be a processor or a controller, for example, a general-purpose central processing unit (central processing unit, CPU), a general-purpose processor, a digital signal processing (digital signal processing, DSP), and an application specific integrated circuit (application specific integrated circuit). circuits, ASIC), field programmable gate array (FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. It can implement or execute various exemplary logical blocks, modules and circuits described in conjunction with the disclosure of this application.
  • the processor may also be a combination for realizing computing functions, for example, including a combination of one or more microprocessors, a combination of a DSP and a microprocessor, and so on.
  • the communication unit 901 is an interface circuit of the device for receiving signals from other devices.
  • the communication unit 901 is an interface circuit used by the chip to receive signals from other chips or devices, or an interface circuit used by the chip to send signals to other chips or devices.
  • the device 900 may be a mobility management network element, a session management network element, a policy control network element, or a network storage network element in the foregoing embodiment, and may also be a mobility management network element, a session management network element, and a policy control network element. Network element, or chip of network storage network element.
  • the processing unit 902 may be a processor
  • the communication unit 901 may be a transceiver, for example.
  • the transceiver may include a radio frequency circuit
  • the storage unit may be, for example, a memory.
  • the processing unit 902 may be, for example, a processor, and the communication unit 901 may be, for example, Input/output interface, pin or circuit, etc.
  • the processing unit 902 can execute computer-executable instructions stored in the storage unit.
  • the storage unit is a storage unit in the chip, such as a register and a cache.
  • the storage unit can also be the mobility management network element or session management.
  • Network elements, policy control network elements, or storage units outside the chip in network storage network elements such as read-only memory (ROM) or other types of static storage devices that can store static information and instructions, Random access memory (random access memory, RAM), etc.
  • the device is the mobility management network element in the foregoing embodiment.
  • the processing unit 902 is configured to determine the first DNAI corresponding to the first session of the terminal device; the communication unit 901 is configured to select all or part of the DNAI in the first DNAI for the first session of the terminal device The first session management network element.
  • the processing unit 902 is configured to determine the first data network access identifier DNAI corresponding to the first session of the terminal device, specifically including: obtaining first information through the communication unit 901,
  • the first information includes a session identifier of the terminal device and a second DNAI corresponding to the session identifier of the terminal device, the second DNAI is one or more DNAIs, and the session identifier of the terminal device includes The identification of the first session; the identification of the first session is acquired through the communication unit 901; the identification of the first session is determined according to the identification of the first session and the first information DNAI.
  • the communication unit 901 is further configured to obtain second information, where the second information includes the identifier of the first session and the third DNAI corresponding to the identifier of the first session,
  • the third DNAI is one or more DNAIs;
  • the processing unit 902 is further configured to determine a fourth DNAI based on the third DNAI; and, for the first session of the terminal device, select to support the The second session management network element of all or part of the DNAI in the fourth DNAI.
  • the fourth DNAI is the same as the third DNAI; or, the fourth DNAI includes the first DNAI and the third DNAI.
  • the communication unit 901 is configured to obtain the first information, which specifically includes: receiving the first information from a policy control network element or other mobility management network elements.
  • the communication unit 901 is configured to obtain the identifier of the first session, including: receiving a request message from the terminal device, the request message including the identifier of the first session The request message is used to request the establishment of the first session; or, to receive context information of the terminal device from another mobility management network element, where the context information includes the identifier of the first session.
  • the processing unit 902 is configured to determine the first DNAI corresponding to the first session of the terminal device, specifically including: receiving through the communication unit 901 from a policy control network element or other mobility The first DNAI corresponding to the first session of the management network element.
  • the processing unit 902 is further configured to select a third session management network element for the first session of the terminal device; the processing unit 902 is configured to The session selection of the first session management network element that supports all or part of the DNAI in the first DNAI specifically includes: determining that the third session management network element does not support all or part of the DNAI in the first DNAI, then The first session selects a first session management network element that supports all or part of the DNAI in the first DNAI.
  • the communication unit 901 is further configured to receive a fifth DNAI corresponding to the first session from the policy control network element, where the fifth DNAI is one or more DNAIs;
  • the processing unit 902 is further configured to determine a sixth DNAI according to the fifth DNAI; and select a fourth DNAI that supports all or part of the sixth DNAI for the first session of the terminal device. Session management network element.
  • the sixth DNAI is the same as the fifth DNAI; or, the sixth DNAI includes the first DNAI and the fifth DNAI.
  • the identifier of the first session includes one or more of the following: DNN, S-NSSAI.
  • the communication unit 901 is further configured to obtain the DNAI supported by the first session management network element from a network storage network element.
  • the device is the policy control network element in the above embodiment.
  • the processing unit 902 is configured to obtain first information, where the first information includes a session identifier of the terminal device and a second DNAI corresponding to the session identifier of the terminal device, and the second DNAI is one or more DNAI; communication unit 901, configured to send the first information to a mobility management network element, where the first information is used for the mobility management network element to select a session management network element.
  • the policy control network element sending the first information to the mobility management network element includes: the policy control network element sends the first information to the mobility management network element during the registration process of the terminal device.
  • the sexual management network element sends the first information.
  • the device is the policy control network element in the foregoing embodiment.
  • the processing unit 902 is configured to obtain the first DNAI corresponding to the first session of the terminal device; the communication unit 901 is configured to send the first DNAI corresponding to the first session to the mobility management network element.
  • the policy control network element sending the first DNAI corresponding to the first session to the mobility management network element includes: during the session establishment process, the policy control network element sends The mobility management network element sends the first DNAI corresponding to the first session.
  • the device is the session management network element in the foregoing embodiment.
  • the communication unit 901 is configured to: send a registration request message to a network storage network element, where the registration request message includes the ID of the session management network element and the DNAI supported by the session management network element; and, from the network storage network The meta receives a registration response message, which is used to determine the completion of registration.
  • the device is the network storage network element in the foregoing embodiment.
  • the communication unit 901 is configured to receive a registration request message from the session management network element, the registration request message including the ID of the session management network element and the DNAI supported by the session management network element; and, to the session management network element Sending a registration response message, where the registration response message is used to determine the completion of registration; the storage unit is used to store the correspondence between the ID of the session management network element and the DNAI supported by the session management network element.
  • the device is a mobility management network element, a session management network element, a policy control network element, or a network storage network element
  • the mobility management network element, session management network element, policy control network element, or network storage network element may be used
  • the integrated way is presented in the form of dividing each functional module.
  • the "module" here can refer to a specific ASIC, circuit, processor and memory that executes one or more software or firmware programs, integrated logic circuit, and/or other devices that can provide the above-mentioned functions.
  • the mobility management network element, the session management network element, the policy control network element, or the network storage network element may adopt the form shown in FIG. 10.
  • the processor 1002 in FIG. 10 may invoke the computer execution instructions stored in the memory 1001 to cause the mobility management network element, the session management network element, the policy control network element, or the network storage network element to execute the above method embodiments. method.
  • the functions/implementation process of the communication unit 901 and the processing unit 902 in FIG. 9 may be implemented by the processor 1002 in FIG. 10 calling a computer execution instruction stored in the memory 1001.
  • the function/implementation process of the processing unit 902 in FIG. 9 may be implemented by the processor 1002 in FIG. 10 calling computer execution instructions stored in the memory 1001, and the function/implementation process of the communication unit 901 in FIG. 10 in the communication interface 1003 to achieve.
  • the function/implementation process of the communication unit 901 may also be implemented by pins or circuits.
  • the apparatus may be a mobility management network element, a session management network element, a policy control network element, or a network storage network element in the foregoing embodiment.
  • the device 1000 includes a processor 1002 and a communication interface 1003.
  • the device 1000 may further include a memory 1001.
  • the device 1000 may further include a communication line 1004.
  • the communication interface 1003, the processor 1002, and the memory 1001 may be connected to each other through a communication line 1004;
  • the communication line 1004 may be a peripheral component interconnection standard (peripheral component interconnect, PCI for short) bus or an extended industry standard architecture (extended industry standard architecture) , Referred to as EISA) bus and so on.
  • the communication line 1004 can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is used to represent in FIG. 10, but it does not mean that there is only one bus or one type of bus.
  • the processor 1002 may be a CPU, a microprocessor, an ASIC, or one or more integrated circuits used to control the execution of the programs of the present application.
  • the communication interface 1003 uses any device such as a transceiver to communicate with other devices or communication networks, such as Ethernet, radio access network (RAN), wireless local area networks (WLAN), Wired access network, etc.
  • RAN radio access network
  • WLAN wireless local area networks
  • Wired access network etc.
  • the memory 1001 may be ROM or other types of static storage devices that can store static information and instructions, RAM or other types of dynamic storage devices that can store information and instructions, or may be an electrically erasable programmable read-only memory (electrically erasable programmable read-only memory).
  • read-only memory EEPROM
  • compact disc read-only memory, CD-ROM
  • optical disc storage including compact discs, laser discs, optical discs, digital universal discs, Blu-ray discs, etc.
  • magnetic disks A storage medium or other magnetic storage device, or any other medium that can be used to carry or store desired program codes in the form of instructions or data structures and that can be accessed by a computer, but is not limited thereto.
  • the memory can exist independently and is connected to the processor through the communication line 1004. The memory can also be integrated with the processor.
  • the memory 1001 is used to store computer execution instructions for executing the solution of the present application, and the processor 1002 controls the execution.
  • the processor 1002 is configured to execute computer-executable instructions stored in the memory 1001, so as to implement the method for selecting a session management network element provided in the foregoing embodiment of the present application.
  • the computer-executable instructions in the embodiments of the present application may also be referred to as application program code, which is not specifically limited in the embodiments of the present application.
  • At least one (piece, species) of a, b, or c can represent: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or Multiple.
  • Multiple refers to two or more, and other measure words are similar.
  • "a device” means to one or more such devices.
  • the computer program product includes one or more computer instructions.
  • the computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices.
  • the computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from a website, computer, server, or data center.
  • the computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or a data center integrated with one or more available media.
  • the usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium (for example, a solid state disk (SSD)), etc.
  • the various illustrative logic units and circuits described in the embodiments of this application can be implemented by general-purpose processors, digital signal processors, application-specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, Discrete gates or transistor logic, discrete hardware components, or any combination of the above are designed to implement or operate the described functions.
  • the general-purpose processor may be a microprocessor, and optionally, the general-purpose processor may also be any traditional processor, controller, microcontroller, or state machine.
  • the processor can also be implemented by a combination of computing devices, such as a digital signal processor and a microprocessor, multiple microprocessors, one or more microprocessors combined with a digital signal processor core, or any other similar configuration achieve.
  • the steps of the method or algorithm described in the embodiments of the present application can be directly embedded in hardware, a software unit executed by a processor, or a combination of the two.
  • the software unit can be stored in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM or any other storage medium in the field.
  • the storage medium may be connected to the processor, so that the processor can read information from the storage medium, and can store and write information to the storage medium.
  • the storage medium may also be integrated into the processor.
  • the processor and the storage medium can be arranged in the ASIC.
  • These computer program instructions can also be loaded on a computer or other programmable data processing equipment, so that a series of operation steps are executed on the computer or other programmable equipment to produce computer-implemented processing, so as to execute on the computer or other programmable equipment.
  • the instructions provide steps for implementing functions specified in a flow or multiple flows in the flowchart and/or a block or multiple blocks in the block diagram.

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Abstract

本申请提供一种会话管理网元的选择方法、装置及系统。该方法包括：移动性管理网元确定与终端设备的第一会话对应的第一DNAI；移动性管理网元为终端设备的第一会话选择支持第一DNAI中的全部或部分DNAI的第一会话管理网元。基于该方案，移动性管理网元为终端设备选择一个会话管理网元，该会话管理网元支持第一DNAI中的全部或部分DNAI，从而该会话管理网元选择的用户面网元也支持第一DNAI中的全部或部分DNAI，实现了为终端设备选择了一个合适的会话管理网元。

Description

一种会话管理网元的选择方法、装置及系统
相关申请的交叉引用
本申请要求在2019年07月23日提交中国专利局、申请号为201910668398.9、申请名称为“一种会话管理网元的选择方法、装置及系统”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
本申请涉及移动通信技术领域，尤其涉及一种会话管理网元的选择方法、装置及系统。
背景技术
在第五代(5th generation，5G)系统中，终端设备接入网络后建立会话(这里以会话为协议数据单元(protocol data unit，PDU)会话为例进行说明)，并通过PDU会话访问外部数据网络，实现终端设备与部署在数据网络中的应用服务器的交互。
在应用访问过程中，终端设备的接入位置发生移动，导致可能需要为终端设备重新选择会话管理网元。目前一般是根据终端设备的移动后的位置信息，为终端设备重新选择会话管理网元。
发明内容
本申请提供一种会话管理网元的选择方法、装置及系统，用以实现为终端设备选择合适的会话管理网元。
第一方面，本申请提供一种会话管理网元的选择方法，该方法包括：移动性管理网元确定与终端设备的第一会话对应的第一DNAI；移动性管理网元为终端设备的第一会话选择支持第一DNAI中的全部或部分DNAI的第一会话管理网元。
基于该方案，移动性管理网元为终端设备选择一个会话管理网元，该会话管理网元支持第一DNAI中的全部或部分DNAI，从而该会话管理网元选择的用户面网元也支持第一DNAI中的全部或部分DNAI，即该会话管理网元负责关联支持第一会话对应的第一DNAI中的部分或全部DNAI的用户面网元，实现了为终端设备选择合适的会话管理网元，通过该选择的会话管理网元，实现为终端设备选择一个支持第一会话对应的DNAI的用户面网元作为PSA，进而可以减少路由迂回，降低网络延迟。
在一种可能的实现方法中，移动性管理网元确定与终端设备的第一会话对应的第一DNAI，包括：移动性管理网元获取第一信息，第一信息包括终端设备的会话的标识和终端设备的会话的标识对应的第二DNAI，所述第二DNAI为一个或多个DNAI，终端设备的会话的标识包括第一会话的标识；移动性管理网元获取第一会话的标识；移动性管理网元根据第一会话的标识和第一信息，确定第一会话对应的第一DNAI。
在一种可能的实现方法中，移动性管理网元获取第二信息，第二信息包括第一会话的标识和第一会话的标识对应的第三DNAI；移动性管理网元根据第三DNAI，确定第四DNAI；移动性管理网元为终端设备的第一会话选择支持第四DNAI中的全部或部分DNAI的第二 会话管理网元。
在一种可能的实现方法中，第四DNAI与第三DNAI相同；或者，第四DNAI包括第一DNAI和第三DNAI。
在一种可能的实现方法中，移动性管理网元获取第一信息，包括：移动性管理网元接收来自策略控制网元或其他移动性管理网元的第一信息。
在一种可能的实现方法中，移动性管理网元获取第一会话的标识，包括：移动性管理网元接收来自终端设备的请求消息，请求消息包括第一会话的标识，请求消息用于请求建立第一会话；或者，移动性管理网元从其他移动性管理网元接收终端设备的上下文信息，上下文信息中包括第一会话的标识。
在一种可能的实现方法中，移动性管理网元确定与终端设备的第一会话对应的第一DNAI，包括：移动性管理网元接收来自策略控制网元或其他移动性管理网元的第一会话对应的第一DNAI。
在一种可能的实现方法中，移动性管理网元为终端设备的第一会话选择第三会话管理网元；移动性管理网元为第一会话选择支持第一DNAI中的全部或部分DNAI的第一会话管理网元，包括：移动性管理网元确定第三会话管理网元不支持第一DNAI中的全部或部分DNAI，则为第一会话选择支持第一DNAI中的全部或部分DNAI的第一会话管理网元。
在一种可能的实现方法中，移动性管理网元接收来自策略控制网元的第一会话对应的第五DNAI；移动性管理网元根据第五DNAI，确定第六DNAI；移动性管理网元为终端设备的第一会话选择支持第六DNAI中的全部或部分DNAI的第四会话管理网元。
在一种可能的实现方法中，第六DNAI与第五DNAI相同；或者，第六DNAI包括第一DNAI和第五DNAI。
在一种可能的实现方法中，第一会话的标识包括以下一项或多项：DNN、S-NSSAI。
在一种可能的实现方法中，所述移动性管理网元从网络存储网元获取所述第一会话管理网元支持的DNAI。
第二方面，本申请提供一种会话管理网元的选择方法，该方法包括：策略控制网元获取第一信息，第一信息包括终端设备的会话的标识和终端设备的会话的标识对应的第二DNAI，所述第二DNAI为一个或多个DNAI；策略控制网元向移动性管理网元发送第一信息，第一信息用于移动性管理网元选择会话管理网元。
在一种可能的实现方法中，策略控制网元向移动性管理网元发送第一信息，包括：策略控制网元在终端设备的注册过程中，向移动性管理网元发送第一信息。
第三方面，本申请提供一种会话管理网元的选择方法，该方法包括：策略控制网元获取终端设备的第一会话对应的第一DNAI；策略控制网元向移动性管理网元发送第一会话对应的第一DNAI。
在一种可能的实现方法中，策略控制网元向移动性管理网元发送第一会话对应的第一DNAI，包括：策略控制网元在会话建立过程中，向移动性管理网元发送第一会话对应的第一DNAI。
第四方面，本申请提供一种会话管理网元的选择装置，该装置可以是移动性管理网元，还可以是用于移动性管理网元的芯片。该装置具有实现上述第一方面或第一方面的各实施例的功能。该功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。该硬件或软件包括一个或多个与上述功能相对应的模块。
第五方面，本申请提供一种会话管理网元的选择装置，该装置可以是策略控制网元，还可以是用于策略控制网元的芯片。该装置具有实现上述第二方面或第二方面的各实施例，或者实现上述第三方面或第三方面的各实施例的功能。该功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。该硬件或软件包括一个或多个与上述功能相对应的模块。
第六方面，本申请提供一种会话管理网元的选择装置，包括处理器和存储器；该存储器用于存储计算机执行指令，当该装置运行时，该处理器执行该存储器存储的该计算机执行指令，以使该装置执行如上述第一方面至第三方面、或第一方面至第三方面的各实施例的方法。
第七方面，本申请提供一种会话管理网元的选择装置，包括用于执行上述第一方面至第三方面、或第一方面至第三方面的各个步骤的单元或手段(means)。
第八方面，本申请提供一种会话管理网元的选择装置，包括处理器和接口电路，所述处理器用于通过接口电路与其它装置通信，并执行上述第一方面至第三方面、或第一方面至第三方面的各实施例的方法。该处理器包括一个或多个。
第九方面，本申请提供一种会话管理网元的选择装置，包括处理器，用于与存储器相连，用于调用所述存储器中存储的程序，以执行上述第一方面至第三方面、或第一方面至第三方面的各实施例的方法。该存储器可以位于该装置之内，也可以位于该装置之外。且该处理器包括一个或多个。
第十方面，本申请还提供一种计算机可读存储介质，所述计算机可读存储介质中存储有指令，当其在计算机上运行时，使得处理器执行上述各方面所述的方法。
第十一方面，本申请还提供一种包括指令的计算机程序产品，当其在计算机上运行时，使得计算机执行上述各方面所述的方法。
第十二方面，本申请还提供一种芯片系统，包括：处理器，用于执行上述各方面所述的方法。
第十三方面，本申请提供一种会话管理网元的选择系统，该系统包括移动性管理网元和第一会话管理网元；
移动性管理网元，用于确定与终端设备的第一会话对应的第一DNAI；以及，为终端设备的第一会话选择支持第一DNAI中的全部或部分DNAI的第一会话管理网元。
在一种可能的实现方法中，用于获取第一信息；以及，向移动性管理网元发送第一信息；
移动性管理网元用于获取第一信息，具体包括：用于接收来自策略控制网元的第一信息。
在一种可能的实现方法中，所述系统还包括策略控制网元，用于获取终端设备的第一会话对应的第一DNAI；以及，向移动性管理网元发送第一会话对应的第一DNAI；
移动性管理网元，用于确定与终端设备的第一会话对应的第一DNAI，具体包括：用于接收来自策略控制网元或其他移动性管理网元的第一会话对应的第一DNAI。
在一种可能的实现方法中，所述移动性管理网元，用于为所述终端设备的所述第一会话选择支持所述第一DNAI中的全部或部分DNAI的所述第一会话管理网元，包括：用于根据所述第一DNAI和所述第一会话管理网元支持的DNAI，为所述终端设备的所述第一会话选择支持所述第一DNAI中的全部或部分DNAI的所述第一会话管理网元。
在一种可能的实现方法中，所述系统还包括网络存储网元；所述移动性管理网元，还用于从所述网络存储网元获取所述第一会话管理网元支持的DNAI。
在一种可能的实现方法中，所述第一会话管理网元，用于向所述网络存储网元发送注册请求消息，所述注册请求消息包括所述第一会话管理网元的标识和所述第一会话管理网元支持的DNAI；以及，从所述网络存储网元接收注册响应消息，所述注册响应消息用于确定注册完成；所述网络存储网元，用于从所述第一会话管理网元接收所述注册请求消息；存储所述第一会话管理网元的标识和所述第一会话管理网元支持的DNAI之间的对应关系；以及，向所述第一会话管理网元发送所述注册响应消息。
附图说明
图1为本申请提供的一种会话管理网元的选择系统示意图；
图2A为基于服务化架构的5G网络架构示意图；
图2B为基于点对点接口的5G网络架构示意图；
图3为本申请提供的一种SMF的选择方法流程示意图；
图4为本申请提供的又一种SMF的选择方法流程示意图；
图5为本申请提供的又一种SMF的选择方法流程示意图；
图6为本申请提供的又一种SMF的选择方法流程示意图；
图7为本申请提供的又一种SMF的选择方法流程示意图；
图8为本申请提供的一种SMF的注册方法流程示意图；
图9为本申请提供的一种装置示意图；
图10为本申请提供的又一种装置示意图。
具体实施方式
为了使本申请的目的、技术方案和优点更加清楚，下面将结合附图对本申请作进一步地详细描述。方法实施例中的具体操作方法也可以应用于装置实施例或系统实施例中。其中，在本申请的描述中，除非另有说明，“多个”的含义是两个或两个以上。
为解决背景技术中提到的问题，如图1所示，本申请提供一种会话管理网元的选择系统示意图，该系统包括移动性管理网元和第一会话管理网元，可选的，该系统还包括策略控制网元。移动性管理网元，用于确定与终端设备的第一会话对应的第一DNAI；以及，为终端设备的第一会话选择支持第一DNAI中的全部或部分DNAI的第一会话管理网元。
在一种可能的实现方法中，移动性管理网元，用于确定与终端设备的第一会话对应的第一DNAI，包括：用于获取第一信息，第一信息包括终端设备的会话的标识和终端设备的会话的标识对应的第二DNAI，所述第二DNAI为一个或多个DNAI，终端设备的会话的标识包括第一会话的标识；获取第一会话的标识；根据第一会话的标识和第一信息，确定第一会话对应的第一DNAI。
在一种可能的实现方法中，移动性管理网元，还用于：获取第二信息，第二信息包括第一会话的标识和第一会话的标识对应的第三DNAI；根据第三DNAI，确定第四DNAI；为终端设备的第一会话选择支持第四DNAI中的全部或部分DNAI的第二会话管理网元。
在一种可能的实现方法中，第四DNAI与第三DNAI相同；或者，第四DNAI包括第 一DNAI和第三DNAI。
在一种可能的实现方法中，策略控制网元用于获取第一信息；以及，向移动性管理网元发送第一信息；移动性管理网元用于获取第一信息，具体包括：用于接收来自策略控制网元的第一信息。
在一种可能的实现方法中，策略控制网元用于向移动性管理网元发送第一信息，具体包括：用于在终端设备的注册过程中，向移动性管理网元发送第一信息。
在一种可能的实现方法中，移动性管理网元用于获取第一信息，具体包括：用于接收来自其他移动性管理网元的第一信息。
在一种可能的实现方法中，移动性管理网元用于获取第一会话的标识，包括：用于接收来自终端设备的请求消息，请求消息包括第一会话的标识，请求消息用于请求建立第一会话；或者，用于从其他移动性管理网元接收终端设备的上下文信息，上下文信息中包括第一会话的标识。
在一种可能的实现方法中，策略控制网元，用于获取终端设备的第一会话对应的第一DNAI；以及，向移动性管理网元发送第一会话对应的第一DNAI；移动性管理网元，用于确定与终端设备的第一会话对应的第一DNAI，具体包括：用于接收来自策略控制网元或其他移动性管理网元的第一会话对应的第一DNAI。
在一种可能的实现方法中，移动性管理网元还用于为终端设备的第一会话选择第三会话管理网元；移动性管理网元，用于为第一会话选择支持第一DNAI中的全部或部分DNAI的第一会话管理网元，具体包括：用于确定第三会话管理网元不支持第一DNAI中的全部或部分DNAI，则为第一会话选择支持第一DNAI中的全部或部分DNAI的第一会话管理网元。
在一种可能的实现方法中，移动性管理网元还用于：接收来自策略控制网元的第一会话对应的第五DNAI；根据第五DNAI，确定第六DNAI；为终端设备的第一会话选择支持第六DNAI中的全部或部分DNAI的第四会话管理网元。
在一种可能的实现方法中，第六DNAI与第五DNAI相同；或者，第六DNAI包括第一DNAI和第五DNAI。
在一种可能的实现方法中，第一会话的标识包括以下一项或多项：DNN、S-NSSAI。
在一种可能的实现方法中，图1所示的系统还包括网络存储网元，所述移动性管理网元，还用于从所述网络存储网元获取所述第一会话管理网元支持的DNAI。在一种可能的实现方法中，所述第一会话管理网元，用于向所述网络存储网元发送注册请求消息，注册请求消息包括第一会话管理网元的标识和第一会话管理网元支持的DNAI；以及，从网络存储网元接收注册响应消息，注册响应消息用于确定注册完成；
所述网络存储网元，用于从第一会话管理网元接收注册请求消息；存储第一会话管理网元的标识和第一会话管理网元支持的DNAI之间的对应关系；以及，向第一会话管理网元发送注册响应消息。
如图2A所示，为基于服务化架构的5G网络架构示意图。图2A所示的5G网络架构中可包括三部分，分别是终端设备部分、数据网络(data network，DN)和运营商网络部分。下面对其中的部分网元的功能进行简单介绍说明。
其中，运营商网络可包括以下网元中的一个或多个：网络开放功能(network exposure  function，NEF)网元、策略控制功能(policy control function，PCF)网元、统一数据管理(unified data management，UDM)网元、网络存储功能(Network Repository Function，NRF)网元、应用功能(application function，AF)网元、接入与移动性管理功能(access and mobility management function，AMF)网元、会话管理功能(session management function，SMF)网元、(无线)接入网((radio)access network，(R)AN)以及用户面功能(user plane function，UPF)网元等。上述运营商网络中，除(无线)接入网部分之外的部分可以称为核心网络部分。为方便说明，后续以(R)AN称为RAN为例进行说明。
终端设备(terminal device)，也可以称为用户设备(user equipment，UE)，是一种具有无线收发功能的设备，可以部署在陆地上，包括室内或室外、手持或车载；也可以部署在水面上(如轮船等)；还可以部署在空中(例如飞机、气球和卫星上等)。所述终端设备可以是手机(mobile phone)、平板电脑(pad)、带无线收发功能的电脑、虚拟现实(virtual reality，VR)终端、增强现实(augmented reality，AR)终端、工业控制(industrial control)中的无线终端、无人驾驶(self driving)中的无线终端、远程医疗(remote medical)中的无线终端、智能电网(smart grid)中的无线终端、运输安全(transportation safety)中的无线终端、智慧城市(smart city)中的无线终端、智慧家庭(smart home)中的无线终端等。
上述终端设备可通过运营商网络提供的接口(例如N1等)与运营商网络建立连接，使用运营商网络提供的数据和/或语音等服务。终端设备还可通过运营商网络访问DN，使用DN上部署的运营商业务，和/或第三方提供的业务。其中，上述第三方可为运营商网络和终端设备之外的服务方，可为终端设备提供他数据和/或语音等服务。其中，上述第三方的具体表现形式，具体可根据实际应用场景确定，在此不做限制。
RAN是运营商网络的子网络，是运营商网络中业务节点与终端设备之间的实施系统。终端设备要接入运营商网络，首先是经过RAN，进而可通过RAN与运营商网络的业务节点连接。本申请中的RAN设备，是一种为终端设备提供无线通信功能的设备，RAN设备也称为接入网设备。本申请中的RAN设备包括但不限于：5G中的下一代基站(g nodeB，gNB)、演进型节点B(evolved node B，eNB)、无线网络控制器(radio network controller，RNC)、节点B(node B，NB)、基站控制器(base station controller，BSC)、基站收发台(base transceiver station，BTS)、家庭基站(例如，home evolved nodeB，或home node B，HNB)、基带单元(baseBand unit，BBU)、传输点(transmitting and receiving point，TRP)、发射点(transmitting point，TP)、移动交换中心等。
AMF网元，是由运营商网络提供的控制面网元，负责终端设备接入运营商网络的接入控制和移动性管理，例如包括移动状态管理，分配用户临时身份标识，认证和授权用户等功能。
SMF网元，是由运营商网络提供的控制面网元，负责管理终端设备的PDU会话。PDU会话是一个用于传输PDU的通道，终端设备需要通过PDU会话与DN互相传送PDU。PDU会话由SMF网元负责建立、维护和删除等。SMF网元包括会话管理(如会话建立、修改和释放，包含UPF和AN之间的隧道维护)、UPF网元的选择和控制、业务和会话连续性(Service and Session Continuity，SSC)模式选择、漫游等会话相关的功能。
UPF网元，是由运营商提供的网关，是运营商网络与DN通信的网关。UPF网元包括数据包路由和传输、包检测、业务用量上报、服务质量(Quality of Service，QoS)处理、合法监听、上行包检测、下行数据包存储等用户面相关的功能。
DN，是位于运营商网络之外的网络，运营商网络可以接入多个DN，DN上可部署多种业务，可为终端设备提供数据和/或语音等服务。例如，DN是某智能工厂的私有网络，智能工厂安装在车间的传感器可为终端设备，DN中部署了传感器的控制服务器，控制服务器可为传感器提供服务。传感器可与控制服务器通信，获取控制服务器的指令，根据指令将采集的传感器数据传送给控制服务器等。又例如，DN是某公司的内部办公网络，该公司员工的手机或者电脑可为终端设备，员工的手机或者电脑可以访问公司内部办公网络上的信息、数据资源等。
UDM网元，是由运营商提供的控制面网元，负责存储运营商网络中签约用户的用户永久标识符(subscriber permanent identifier，SUPI)、信任状(credential)、安全上下文(security context)、签约数据等信息。UDM网元所存储的这些信息可用于终端设备接入运营商网络的认证和授权。其中，上述运营商网络的签约用户具体可为使用运营商网络提供的业务的用户，例如使用中国电信的手机芯卡的用户，或者使用中国移动的手机芯卡的用户等。上述签约用户的SUPI可为该手机芯卡的号码等。上述签约用户的信任状、安全上下文可为该手机芯卡的加密密钥或者跟该手机芯卡加密相关的信息等存储的小文件，用于认证和/或授权。上述安全上下文可为存储在用户本地终端(例如手机)上的数据(cookie)或者令牌(token)等。上述签约用户的签约数据可为该手机芯卡的配套业务，例如该手机芯卡的流量套餐或者使用网络等。需要说明的是，永久标识符、信任状、安全上下文、认证数据(cookie)、以及令牌等同认证、授权相关的信息，在本发明本申请文件中，为了描述方便起见不做区分、限制。如果不做特殊说明，本申请实施例将以用安全上下文为例进行来描述，但本申请实施例同样适用于其他表述方式的认证、和/或授权信息。
NEF网元，是由运营商提供控制面网元。NEF网元以安全的方式对第三方开放运营商网络的对外接口。在SMF网元需要与第三方的网元通信时，NEF网元可作为SMF网元与第三方的网元通信的中继。NEF网元作为中继时，可作为签约用户的标识信息的翻译，以及第三方的网元的标识信息的翻译。比如，NEF将签约用户的SUPI从运营商网络发送到第三方时，可以将SUPI翻译成其对应的外部身份标识(identity，ID)。反之，NEF网元将外部ID(第三方的网元ID)发送到运营商网络时，可将其翻译成SUPI。
应用功能(Application Function，AF)网元，主要提供应用层服务，还支持与5G核心网交互来提供服务，例如影响数据路由决策，策略控制功能或者向网络侧提供第三方的一些服务。本申请中，AF网元包括应用服务器，该应用服务器指的是第三方服务器。
PCF网元，是由运营商提供的控制面功能，用于向网络网元提供策略。作为一种实现方式，策略可以包括接入控制策略、移动性管理策略、计费相关策略、QoS相关策略和授权相关策略等。
NRF网元，可用于提供网元发现功能，基于其他网元的请求，提供网元类型对应的网元信息。NRF还提供网元管理服务，如网元注册、更新、去注册以及网元状态订阅和推送等。
图2A中Nnef、Npcf、Nudm、Naf、Namf、Nsmf、N1、N2、N3、N4，以及N6为接口序列号。这些接口序列号的含义可参见第三代合作伙伴计划(3rd generation partnership project，3GPP)标准协议中定义的含义，在此不做限制。
如图2B所示，为基于点对点接口的5G网络架构示意图，其中的网元的功能的介绍可 以参考图2A中对应的网元的功能的介绍，不再赘述。图2B与图2A的主要区别在于：图2B中的各个网元之间的接口是点对点的接口，而不是服务化的接口。
在图2B所示的架构中，其中，UE与AMF网元之间的接口称为N1接口，AMF网元与RAN设备之间的接口称为N2接口，RAN设备与UPF网元之间的接口可以称为N3接口，SMF网元与UPF网元之间的接口称为N4接口，PCF网元与AF网元之间的接口称为N5接口，UPF网元与DN之间的接口称为N6接口，SMF网元与PCF网元之间的接口称为N7接口，AMF网元与UDM网元之间的接口称为N8接口，不同UPF网元之间的接口称为N9接口，UDM网元与SMF网元之间的接口称为N10接口，AMF网元与SMF网元之间的接口称为N11接口，不同AMF网元之间的接口称为N14接口，AMF网元与PCF网元之间的接口称为N15接口。
可以理解的是，上述网元或者功能既可以是硬件设备中的网络元件，也可以是在专用硬件上运行软件功能，或者是平台(例如，云平台)上实例化的虚拟化功能。可选的，上述网元或者功能可以由一个设备实现，也可以由多个设备共同实现，还可以是一个设备内的一个功能模块，本申请实施例对此不作具体限定。
本申请中的移动性管理网元、会话管理网元、策略控制网元、应用功能网元、接入网设备、网络存储网元分别可以是图2A或图2B中的AMF、SMF、PCF、AF、RAN、NRF，也可以是未来通信如第六代(6th generation，6G)网络中具有上述AMF、SMF、PCF、AF、RAN、NRF的功能的网元，本申请对此不限定。为方便说明，本申请以移动性管理网元、会话管理网元、策略控制网元、应用功能网元、接入网设备、网络存储网元分别为上述AMF、SMF、PCF、AF、RAN、NRF为例进行说明。并且，本申请中将终端设备简称为UE。
根据UE访问的数据网络的不同，网络可以根据网络策略选择接入数据网络的UPF作为PDU会话锚点(PDU Session Anchor，PSA)，并通过PSA的N6接口访问AF。同一个应用的AF可以部署在多个位置，这样网络就能够根据UE的接入位置，选择靠近UE、且支持UE访问数据网络的PSA，以便减少路由迂回，降低网络延迟。
在应用访问过程中，UE的接入位置发生移动，为减少路由迂回，PSA需要进行重选，以便就近访问应用。在现有技术中，PSA重选的方法是：AF向SMF发送请求消息，该请求消息包括数据网络接入标识(data network access identifier，DNAI)，DNAI用于标识数据网络的本地接入，然后SMF选择支持该请求消息中的DNAI的UPF作为PSA。
然而，由于网络配置的原因，在某些场景下，SMF所管理的UPF可能不支持UE的所有或大部分可以接入的DNAI，从而导致无法为UE选择合适的PSA，以便让UE就近接入AF。
为解决背景技术中提到的技术问题以及解决上述为UE选择合适的PSA的技术问题，基于前述所示的架构，参考图3，本申请提供一种SMF的选择方法，该方法包括以下步骤：
步骤301，AMF确定与UE的第一会话对应的第一DNAI。
步骤302，AMF为UE的第一会话选择支持第一DNAI中的全部或部分DNAI的第一SMF。
需要说明的是，若当前已经存在一个为UE提供服务的SMF，则该选择的第一SMF是一个新增的SMF，因此可以称为第一I-SMF。基于同样地理由，后续出现的第二SMF、 第三SMF、第四SMF分别可以称为第二I-SMF、第三I-SMF、第四I-SMF。其中，I-SMF是中间(intermediate)SMF的简称。
需要说明的是，本申请中的DNAI，可以认为是数据接入网络的位置信息。例如，在一种场景中，由于负载均衡的原因，AF可以请求数据路由接入点在特定的位置(应用在该位置部署AF)，也就是希望用户的该应用的数据流接入到该位置的AF。
基于上述方案，AMF为UE选择一个SMF，该SMF支持第一DNAI中的全部或部分DNAI，从而该SMF选择的UPF也支持第一DNAI中的全部或部分DNAI，即该SMF负责关联支持第一会话对应的第一DNAI中的部分或全部DNAI的UPF，实现了为UE选择一个合适的SMF。进一步地，可以通过选择的SMF，实现为UE选择一个支持第一会话对应的DNAI的UPF作为PSA，进而可以减少路由迂回，降低网络延迟。
作为示例，下面给出图3实施例的不同实现方法。
实现方法1、在UE的注册过程中，AMF获取与UE相关的DNAI信息；在UE的会话建立过程中，AMF为UE选择第一SMF。
在该实现方法1中，AMF在UE的注册过程中，AMF获取与UE相关的DNAI信息，例如可以是：AMF在UE的注册过程中，获取第一信息，该第一信息即为与UE相关的DNAI信息，该第一信息包括UE的会话的标识和UE的会话的标识对应的第二DNAI，所述第二DNAI为一个或多个DNAI，该UE的会话的标识包括第一会话的标识。
这里的第一信息包括一组或多组对应关系，每组对应关系指的是UE的会话的标识与至少一个DNAI(即第二DNAI)的对应关系。即，第一信息中包括一个或多个会话的标识，每个会话的标识对应一个第二DNAI，该第二DNAI指的是一个或多个DNAI，并且该第一信息中的一个或多个会话的标识中包括第一会话的标识。因此，该第一信息中的与第一会话的标识对应的第二DNAI即为上述第一DNAI，或者理解为，上述第一DNAI为第一信息中的与第一会话的标识对应的第二DNAI。
参考表1，给出了第一信息的一个示例，其中以会话的标识包括DNN和单网络切片选择辅助信息(single network slice selection assistance information，S-NSSAI)为例，每一行代表一组对应关系。
表1
会话的标识 DNAI
DNN1、S-NSSAI1 DNAI1、DNAI2
DNN1、S-NSSAI2 DNAI1、DNAI3
DNN2、S-NSSAI1 DNAI2、DNAI4
…… ……
作为一种实现方法：
AMF可以在UE的注册过程中，从PCF获取上述第一信息，或者是从其他AMF(如UE移动之前，为UE提供服务的AMF)获取上述第一信息。
作为一种实现方法：
UE注册至网络之后，AMF可以在会话建立过程中获取第一会话的标识，比如AMF可以接收来自UE的请求消息，请求消息包括第一会话的标识，请求消息用于请求建立第 一会话；或者，AMF从其他AMF(如UE移动之前，为UE提供服务的AMF)接收UE的上下文信息，上下文信息中包括第一会话的标识。
AMF在获取到第一会话的标识之后，可以根据第一会话的标识以及上述第一信息，确定第一会话对应的第一DNAI。作为示例，该第一会话的标识为表1中的DNN1、S-NSSAI1，则AMF可以根据上述表1，获取到第一会话的标识对应的第一DNAI包括DNAI1和DNAI2。进而，AMF可以为UE选择一个支持DNAI1和DNAI2的SMF。比如，若存在同时支持DNAI1和DNAI2的SMF，则将该SMF选择为第一SMF。当然，如果没有SMF同时支持DNAI1和DNAI2，则可以为UE选择支持DNAI1或DNAI2的SMF作为第一SMF。
作为一种实现方法：
在为UE选择了SMF之后，可以由该SMF为UE选择一个UPF，由于该第一SMF支持第一DNAI中的部分或全部DNAI，则选择的UPF也支持第一DNAI中的部分或全部DNAI，从而为UE选择的该UPF可以作为PSA。
基于上述实现方法1，后续如果与UE相关的DNAI信息发生了更新，则PCF还可以通知AMF进行更新。比如，PCF可以向AMF发送第二信息，该第二信息即为与UE相关的DNAI信息，该第二信息包括UE的会话的标识和UE的会话的标识对应的至少一个DNAI，其中，第二信息包括第一会话的标识和第一会话的标识对应的第三DNAI。
其中，第二信息可以是以全量更新的方式或增量更新的方式通知给AMF。全量更新时，则AMF可以使用第二信息替换第一信息，或者理解为，AMF删除第一信息，将第二信息作为最新的DNAI信息进行存储。增量更新时，则AMF将第一信息和第二信息进行合并，或者理解为，AMF将第一信息和第二信息进行去重后进行存储，因此保存的DNAI信息同时包含第一信息和第二信息。下面方别说明两种不同的更新方式。
更新方式1、全量更新的方式
结合表1的示例，作为一种实现方式，PCF向AMF发送的第二信息包括最新的DNAI信息，该最新的DNAI信息可以是在上述第一信息的基础上进行新增一个或多个会话的标识与DNAI的对应关系(参考表2示例)，或者还可以是对上述第一信息进行修改(参考表3示例)，或者还可以是在上述第一信息的基础上，同时进行新增和修改(参考表4示例)。
表2
会话的标识 DNAI
DNN1、S-NSSAI1 DNAI1、DNAI2
DNN1、S-NSSAI2 DNAI1、DNAI3
DNN2、S-NSSAI1 DNAI2、DNAI4
DNN2、S-NSSAI3 DNAI2、DNAI3、DNAI4
DNN1、S-NSSAI3 DNAI3、DNAI4
…… ……
参考表2，可以看出，在第二信息中，第一会话的标识对应的DNAI没有发生变化，仍然为DNAI1、DNAI2，因此第一会话在第二信息中对应的第三DNAI，与第一会话在第一信息中对应的第一DNAI相同。
表3
会话的标识 DNAI
DNN1、S-NSSAI1 DNAI1、DNAI4
DNN1、S-NSSAI2 DNAI1、DNAI3
DNN2、S-NSSAI1 DNAI2、DNAI4
…… ……
参考表3，可以看出，在第二信息中，第一会话的标识对应的DNAI发生了变化，从DNAI1和DNAI2更新为DNAI1和DNAI4，因此第一会话在第二信息中对应的第三DNAI，与第一会话在第一信息中对应的第一DNAI不同。
表4
会话的标识 DNAI
DNN1、S-NSSAI1 DNAI1、DNAI4
DNN1、S-NSSAI2 DNAI1、DNAI3
DNN2、S-NSSAI1 DNAI2、DNAI4
DNN2、S-NSSAI3 DNAI2、DNAI3、DNAI4
DNN1、S-NSSAI3 DNAI3、DNAI4
…… ……
参考表4，可以看出，在第二信息中，第一会话的标识对应的DNAI发生了变化，从DNAI1和DNAI2更新为DNAI1和DNAI4，因此第一会话在第二信息中对应的第三DNAI，与第一会话在第一信息中对应的第一DNAI不同。
基于上述第二信息的任一实现方法，AMF在获取到第二信息之后，可以根据第二信息中的与第一会话对应的第三DNAI，确定第四DNAI，该第四DNAI与第三DNAI相同，该第四DNAI指的是第一会话对应的最新的DNAI。比如，在表2中，第四DNAI包括DNAI1和DNAI2，在表3和表4中，第四DNAI包括DNAI1和DNAI4。
更新方式2、增量更新的方式
作为一种实现方式，PCF向AMF发送的第二信息可以是在上述第一信息基础上新增的DNAI信息。
结合上述表1，以下表5给出了该更新方式的一个示例。
表5
会话的标识 DNAI
DNN1、S-NSSAI1 DNAI4
DNN1、S-NSSAI2 DNAI2
DNN1、S-NSSAI3 DNAI3、DNAI4
…… ……
参考表5，可以看出，在第二信息中，第一会话对应的第三DNAI包括DNAI4，即第 一会话对应的DNAI新增了DNAI4。
基于上述第二信息的实现方法，AMF在获取到第二信息之后，可以根据第二信息中的与第一会话对应的第三DNAI以及第一信息中的与第一会话对应的第一DNAI，确定第四DNAI，该第四DNAI包括第一DNAI和第三DNAI，该第四DNAI指的是第一会话对应的最新的DNAI。比如，结合表1和表5，可以确定第一会话对应的第四DNAI包括DNAI1、DNAI2和DNAI4。
AMF在通过全量更新或增量更新的方式获取到第一会话对应的最新的DNAI，即第四DNAI之后，可以为UE的第一会话选择支持第四DNAI中的全部或部分DNAI的第二SMF。若第二SMF与第一SMF不同，则将第二SMF作为最新的SMF。若第二SMF与第一SMF相同，则无需更新。
实现方法2、在UE的会话建立过程中，AMF先选择一个SMF(称为第三SMF),然后AMF获取与UE的会话相关的DNAI信息,并根据该DNAI信息为UE重新选择第一SMF。
在该实现方法2中，在UE的会话建立过程中，AMF选择第三SMF，例如可以是：在UE的会话建立过程中，AMF可以根据UE的位置信息为UE的第一会话选择第三SMF。当然，还可以使用其他方式选择第三SMF，本申请对AMF选择第三SMF的方法不做限定。
AMF在选择了第三SMF之后，后续可以与UE的会话相关的DNAI信息。比如，UE在第一会话的建立过程中，从PCF或其他AMF(如UE移动之前为UE提供服务的AMF)获取与第一会话相关的DNAI信息，即第一会话对应的第一DNAI。从而，AMF若确定第三SMF不支持第一DNAI中的全部或部分DNAI，则为第一会话选择支持第一DNAI中的全部或部分DNAI的第一SMF。
基于该实现方法2，AMF可以先不考虑DNAI，为UE选择一个第三SMF，在确定该第三SMF不支持第一会话对应的第一DNAI中的部分或全部DNAI的情况下，则为该UE重新选择一个支持第一会话对应的第一DNAI中的部分或全部DNAI的SMF，即第一SMF。
基于上述实现方法1或实现方法2，在后续UE的第一会话的修改流程中，若第一会话对应的DNAI发生了变化，比如第一会话对应的最新的DNAI为第五DNAI，则PCF可以在会话更新流程中，向AMF发送第一会话对应的第五DNAI，然后AMF根据第五DNAI，确定第六DNAI，该第六DNAI即为第一会话对应的最新的DNAI。其中，若是以全量更新的方式进行更新，则第六DNAI与第五DNAI相同；若是以增量更新的方式进行更新，则第六DNAI包括第一DNAI和第五DNAI。进一步地，可以为UE的第一会话选择支持第六DNAI中的全部或部分DNAI的第四SMF。若第四SMF与当前SMF(即第一SMF或上述第二SMF)不同，则将第四SMF作为最新的SMF。若第四SMF与当前SMF相同，则无需更新。
需要说明的是，上述PCF向AMF发送更新的DNAI信息的两种方式的区别在于：第一种方式(即基于上述实现方法1所描述的发送更新的DNAI信息的方法)是PCF向AMF发送UE粒度的与UE的会话相关的DNAI信息(即上述第二信息)，该第二信息不仅仅包括第一会话的标识和第一会话的标识对应的DNAI，还包括该UE的其他会话的标识和相应的DNAI；而第二种方式(即基于上述实现方法2所描述的发送更新的DNAI信息的方法)是PCF在会话修改过程中仅仅向AMF发送与第一会话对应的最新的DNAI即可，无需发送第一会话的标识，也无需发送该UE的其他会话的标识及相应的DNAI。
下面结合图4-图7，对图3所示的实施例进行具体说明。本申请以下实施例中，New AMF指的是当前为UE提供服务的AMF，Old AMF指的是之前为UE提供服务的AMF，Old AMF上可以存储UE的上下文信息。比如，由于UE的移动而发起重新注册时，则New AMF指的是UE处于移动后的位置时，为UE提供服务的AMF，Old AMF指的是UE处于移动前的位置时，为UE提供服务的AMF。需要说明的是，New AMF也可以称为新AMF，Old AMF也可以称为旧AMF、或原AMF。
PCF分为AM-PCF和SM-PCF，其中，AM-PCF用于向AMF提供接入控制和移动性管理策略以及向UE提供UE策略，SM-PCF用于向SMF提供会话管理相关策略。在具体实现中，AM-PCF和SM-PCF可以合一部署为同一个物理设备上，也可以分开部署在不同的物理设备上，本申请不做限定。
参考图4，本申请提供又一种SMF的选择方法，该方法描述了在UE的注册过程中，New AMF从PCF或Old AMF接收到与该UE相关的DNAI信息，以及，在PDU会话建立过程中，New AMF根据该DNAI信息中的与建立的会话对应的DNAI选择I-SMF。
该方法包括以下步骤：
步骤401，UE向RAN发送初始注册请求(Initial Registration Request)消息，该消息中携带UE的标识(如临时标识等)。相应地，RAN可以接收到该初始注册请求消息。
步骤402，RAN向New AMF发送初始注册请求消息，该消息中携带UE的标识(如临时标识等)。相应地，New AMF可以接收到该初始注册请求消息。
步骤403，若初始注册请求消息中携带临时标识，则New AMF从Old AMF获取UE上下文，若UE上下文中已经包括了与该UE相关的DNAI信息，则Old AMF将DNAI信息发送给New AMF。
这里的DNAI信息包括一组或多组对应关系，每组对应关系指的是会话的标识与至少一个DNAI的对应关系。
这里的与该UE相关的DNAI信息，即为上述实施例中的第一信息。
作为该步骤403的一种具体实现方式，New AMF可以向Old AMF发送Naf_Communication_UEContextTransferrequest，然后Old AMF向New AMFNaf_Communication_UEContextTransfer response，其中携带UE上下文，该UE上下文包括与该UE相关的DNAI信息。
该步骤403可选。
步骤404，New AMF向Old AMF发送注册完成通知消息。相应地，Old AMF可以接收到该注册完成通知消息。
该步骤404可选。
步骤405，New AMF向UDM注册，获取用户签约数据，并订阅用户数据改变通知。
该步骤405可选。
步骤406，Old AMF向UDM去注册，取消订阅签约数据改变通知。
该步骤406可选。
步骤407，New AMF向AM-PCF发送策略控制请求消息，该消息中携带SUPI和UE所属的内部组标识列表。相应地，AM-PCF可以接收到该策略控制请求消息。
作为一种具体实现方法，上述策略控制请求消息可以是Npcf_AMPolicyControl_Create  Request消息。
步骤408，AM-PCF与UDR交互，从UDR获取UE的签约信息以及相关的AF影响导向决策的信息，该信息中包括与该UE相关的DNAI信息。
作为一种具体实现，AM-PCF可以向UDR发送查询请求消息，然后UDR向AM-PCF发送查询响应消息，该查询响应消息包括与该UE相关的DNAI信息，进一步还可以包括UE的签约信息。
上述查询请求消息可以是NUdr_DM_Query Request消息，上述查询响应消息可以是NUdr_DM_Query Response消息。
这里的与该UE相关的DNAI信息与上述步骤403中的与该UE相关的DNAI信息的描述相同，可参考前述描述。
需要说明的是，若可以通过步骤403获取与该UE相关的DNAI信息，则该步骤408中可以不需要获取与该UE相关的DNAI信息；若不能通过步骤403获取与该UE相关的DNAI信息，则可以在该步骤408中获取与该UE相关的DNAI信息。
步骤409，AM-PCF向New AMF发送策略控制响应消息。相应地，New AMF可以接收到该策略控制响应消息。
可选的，该策略控制响应消息中包括上述与该UE相关的DNAI信息。
作为一种具体实现方法，上述策略控制响应消息可以是Npcf_AMPolicyControl_Create Response消息。
步骤410，New AMF向UE发送注册接受(Registration Accept)消息。相应地，UE可以接收到该注册接受消息。
步骤411，UE通过RAN向New AMF发送注册完成(Registration Complete)消息。相应地，New AMF可以接收到该注册完成消息。
通过上述步骤401-步骤411，在UE的注册过程中，UE可以从Old AMF或AM-PCF获取到与UE相关的DNAI信息，并且该DNAI信息是UE粒度的。
接下来描述UE的PDU会话建立过程，在PDU会话建立过程中，为UE选择支持DNAI的I-SMF。
步骤412，UE向New AMF发送会话建立请求消息，该消息用于请求建立PDU会话。相应地，New AMF可以接收到该会话建立请求消息。
可选的，该会话建立请求消息中携带第一会话的标识，该第一会话的标识可以包括DNN、S-NSSAI。
步骤413，New AMF根据UE的当前位置确定需要插入I-SMF，则选择一个I-SMF，并向选择的I-SMF发送上下文建立请求消息，然后，I-SMF向New AMF发送上下文建立响应消息。
这里的上下文建立请求消息比如可以是Nsmf_PDUSession_CreateSMContext Request消息，上下文建立响应消息比如可以是Nsmf_PDUSession_CreateSMContext Response消息。
可选的，New AMF根据UE的第一会话的标识以及获得的DNAI信息，确定该第一会话对应的第一DNAI，然后选择一个支持该第一DNAI中的部分或全部DNAI的SMF，作为I-SMF。
举例来说，步骤412中会话建立请求消息中的第一会话的标识为DNN1、S-NSSAI2，New AMF从Old AMF或AM-PCF获取到与UE相关的DNAI信息，以上述表1为例，则 New AMF可以确定DNN1、S-NSSAI2对应的DNAI包括DNAI1和DNAI3，然后，New AMF选择一个支持DNAI1和/或DNAI3的SMF，作为I-SMF。
比如，若存在一个支持DNAI1和DNAI3的SMF，则可以将该SMF作为I-SMF，若不存在同时支持DNAI1和DNAI3的SMF，则可以选择一个支持DNAI1或DNAI3的SMF作为I-SMF。
其中，New AMF可以通过预配置或通过NRF查询，获知哪些SMF支持该会话对应的DNAI，即New AMF上预配置有该New AMF所管理的一个或多个SMF分别支持的DNAI，或者是NRF中存储有该New AMF所管理的和以及其他AMF所管理的一个或多个SMF分别支持的DNAI。
步骤414，I-SMF选择UPF，并向该UPF发送N4会话建立(N4session establishment)请求消息，以及，UPF向I-SMF返回N4会话建立响应消息。
这里的UPF即为作为PSA的UPF，该UPF也支持该会话对应的DNAI，从而实现了为UE的会话选择一个支持该会话对应的DNAI的PSA。
步骤415，I-SMF向SMF发送会话建立请求消息。相应地，SMF可以接收到该会话建立请求消息。
该会话建立请求消息例如可以是Nsmf_PDUSession_Create Request消息。
步骤416，SMF向UDM注册，获取用户签约数据，并订阅用户数据改变通知。
步骤417，SMF向SM-PCF发送策略控制请求消息。相应地，SM-PCF可以接收到该策略控制请求消息。
该策略控制请求消息例如可以是Npcf_SMPolicyControl_Create Request消息。
步骤418，SM-PCF与UDR交互，获取用户的策略签约信息。
作为一种具体实现，SM-PCF可以向UDR发送查询请求消息，然后UDR向SM-PCF发送查询响应消息，该查询响应消息包括用户的策略签约信息。
上述查询请求消息可以是NUdr_DM_Query Request消息，上述查询响应消息可以是NUdr_DM_Query Response消息。
步骤419，SM-PCF执行策略后，向SMF发送策略控制响应消息。相应地，SMF可以接收到该策略控制响应消息。
该策略控制响应消息例如可以是Npcf_SMPolicyControl_Create Response消息。
步骤420，SMF向I-SMF发送会话建立响应消息。相应地，SMF可以接收到该会话建立响应消息。
该会话建立响应消息例如可以是Nsmf_PDUSession_Create Response消息。
步骤421，I-SMF向AMF发送信息传递消息，以及AMF向I-SMF返回信息传递应答消息。
该信息传递消息例如可以是Namf_Communication_N1N2MessageTransfer消息。
步骤422，AMF继续完成后续的PDU会话建立流程。
基于上述实施例，AMF从PCF(如上述AM-PCF)或其他AMF(如上述Old AMF)获取与UE相关的DNAI信息，在UE建立PDU会话的过程中，根据会话的标识确定建立的PDU会话对应的第一DNAI，然后选择支持该第一DNAI中部分或全部DNAI的I-SMF，然后由该I-SMF选择UPF，由于该I-SMF支持上述第一DNAI，则选择的UPF也支持该第一DNAI，从而可以将该UPF作为PSA，实现了为UE选择合适的PSA，即选择了支持 与会话对应的DNAI的PSA。
作为一种实现方法，在执行图4流程后，由于UE的移动会导致伴随AMF重选的第一会话的切换，目标AMF从源AMF中获取与UE相关的DNAI信息和第一会话的标识，目标AMF确定第一会话的标识对应的第一DNAI，然后选择支持第一DNAI中的部分或全部DNAI的SMF，作为I-SMF。或者目标AMF从源AMF中获取第一会话对应的第一DNAI，然后选择一个支持第一DNAI中的部分或全部DNAI的SMF，作为I-SMF。
参考图5，本申请提供又一种SMF的选择方法，该方法可以与图4所示的实施例相结合，其中，需要满足：步骤501-步骤505可以在任一时刻执行，步骤506-步骤508是在上述步骤422之后执行。
该实施例中，AMF在UE的注册过程中获取到与UE相关的DNAI信息之后，在会话进行过程中，AMF从AM-PCF获取到更新的DNAI信息，进而可以根据更新的DNAI信息重新选择一个I-SMF(即图5中的New I-SMF)。该实施例中的Old I-SMF可以是上述图4实施例中的I-SMF。
该方法包括以下步骤：
步骤501，AF向NEF发送请求消息。相应地，NEF可以接收到该请求消息。
该请求消息携带业务导向信息(Traffic Steering Information)，Traffic Steering Information中可以携带外部组标识或指示信息，该外部组标识用于指示该Traffic Steering Information适用于该外部组标识对应的一个或多个UE，该指示信息用于指示该Traffic Steering Information适用于所有UE。
该Traffic Steering Information中还携带有DNAI信息，该DNAI信息包括一组或多组对应关系，每组对应关系为UE的一个会话的标识与至少一个DNAI之间的对应关系。
该请求消息例如可以是Nnef_TrafficInfluence_Create Request消息。
步骤502，NEF向UDR发送请求消息，该请求消息携带Traffic Steering Information。相应地，UDR可以接收到该请求消息。
比如，该请求消息例如可以是Nudr_DataRepository_Create Request消息。
需要说明的是，若Traffic Steering Information携带外部组标识，则NEF还需要将外部组标识映射成内部组标识，即NEF向UDR发送的Traffic Steering Information携带内部组标识和DNAI信息。
若Traffic Steering Information携带指示信息，则NEF向UDR发送的Traffic Steering Information携带该指示信息和DNAI信息。
步骤503，UDR存储DNAI信息，并向NEF返回响应消息。相应地，NEF可以接收到该响应消息。
该响应消息例如可以是Nudr_DataRepository_Create Response消息。
其中，若Traffic Steering Information携带内部组标识，则UDR存储内部组标识与DNAI信息的对应关系；或者UDR先根据内部组标识确定与该内部组标识对应的UE的标识，然后存储UE的标识与DNAI信息的对应关系。
若Traffic Steering Information携带指示信息，则UDR存储DNAI信息，而不关联UE，表示该DNAI信息适用于所有UE。
步骤504，NEF向AF发送响应消息。相应的，AF可以接收到该相应消息。
该响应消息例如可以是Nnef_TrafficInfluence_Create Response消息。
该步骤504可选。
步骤505，UDR向所有订阅的AM-PCF发送通知消息，该通知消息携带Traffic Steering Information。相应地，AM-PCF可以接收到该通知消息。
步骤506，AM-PCF向AMF发送策略控制更新请求消息，该消息中携带DNAI信息。相应地，AMF可以接收到该策略控制更新请求消息。
该消息中携带DNAI信息即为前述实施例中描述的第二信息。第二信息可以增量更新方式对应的信息，也可以是全量更新方式下对应的信息，具体可以参考前述描述。
该策略控制更新请求消息例如可以是NPcf_AMPolicyControl_UpdateNotify Request消息。
需要说明的是，若Traffic Steering Information中携带内部组标识，则AM-PCF针对与该内部组标识对应的UE执行本步骤。若Traffic Steering Information中携带指示信息，则AM-PCF针对所有UE执行本步骤。
若是增量更新，则AMF根据当前保存的DNAI信息(即上述实施例描述的第一信息)和从AM-PCF接收到的DNAI信息(即上述实施例描述的第二信息)，得到更新后的DNAI信息并保存。
若是全量更新，则AMF将从AM-PCF接收到的DNAI信息(即上述实施例描述的第二信息)，作为更新后的DNAI信息进行保存。
步骤507，AMF向AM-PCF发送策略控制更新响应消息。相应地，AM-PCF可以接收到策略控制更新响应消息。
该策略控制更新响应消息例如可以是NPcf_AMPolicyControl_UpdateNotify Response消息。
步骤508，AMF根据更新后的DNAI信息重选I-SMF。
AMF根据第一会话的标识，确定更新后的DNAI信息中的与该第一会话对应的第一DNAI，然后选择支持该第一DNAI中的部分或全部DNAI的I-SMF。即重选之前的I-SMF为图5所示的Old I-SMF，重选之后的I-SMF为图5所示的New I-SMF。
基于该实施例，AMF可以是PDU会话的进行过程中，得到更新后的DNAI信息，并根据更新后的DNAI信息重选I-SMF，实现了为UE选择合适的I-SMF。
参考图6，本申请提供的又一种SMF的选择方法，该实施例中，AMF在会话建立过程中，先为UE选择一个SMF(即I-SMF1)，然后在获取到第一会话对应的DNAI之后，重新为UE选择一个与第一会话对应的SMF(即I-SMF2)。这里的I-SMF1即为前述实施例中的第三SMF，I-SMF2即为前述实施例中的第一SMF。
该方法包括以下步骤：
步骤601，UE注册到网络。
UE注册至网络的过程，可以参考现有技术描述，这里不再赘述。
步骤602，UE向New AMF发送会话建立请求消息。相应地，New AMF可以接收到该会话建立请求消息。
可选的，该会话建立请求消息中携带第一会话的标识，该第一会话的标识可以包括DNN、S-NSSAI。
步骤603，AMF根据UE的当前位置确定需要插入I-SMF，AMF根据配置或者通过NRF查询获取服务UE当前位置的I-SMF1。AMF向选择的I-SMF1发送上下文建立请求消息，该消息中携带DNN、S-NSSAI、用户标识和UE所属的内部组标识。以及，I-SMF1向AMF发送上下文响应消息。
可选的，上下文建立请求消息可以是Nsmf_PDUSession_CreateSMContext Request消息。上下文建立响应消息可以是Nsmf_PDUSession_CreateSMContext Response消息。
步骤604，I-SMF1选择UPF1后，向UPF1发送N4会话建立请求消息，以及，UPF1向I-SMF1发送N4会话建立响应消息。
步骤605，I-SMF1向SMF发送会话建立请求消息，该消息中携带DNN、S-NSSAI、用户标识和UE所属的内部组标识。相应的，SMF可以接收到该会话建立请求消息。
该会话建立请求消息例如可以是Nsmf_PDUSession_Create Request消息。
步骤606，SMF向UDM注册，获取用户签约数据，并订阅用户数据改变通知。
步骤607，SMF向SM-PCF发送策略控制请求消息。相应地，SM-PCF可以接收到该策略控制请求消息。
该策略控制请求消息携带DNN、S-NSSAI、用户标识和UE所属的内部组标识。
该策略控制请求消息例如可以是Npcf_SMPolicyControl_Create Request消息。
步骤608，SM-PCF与UDR交互，获取用户的策略签约信息。
作为一种具体实现，SM-PCF可以向UDR发送查询请求消息，然后UDR向SM-PCF发送查询响应消息，该查询响应消息包括用户的策略签约信息。
上述查询请求消息可以是NUdr_DM_Query Request消息，上述查询响应消息可以是NUdr_DM_Query Response消息。
步骤609，SM-PCF执行策略后，向SMF发送策略控制响应消息。相应地，SMF可以接收到该策略控制响应消息。
该策略控制响应消息例如可以是Npcf_SMPolicyControl_Create Response消息。
PCF制定用于Traffic Steering control的一个或多个PCC规则，每一个PCC规则中的Traffic steering control information包括DNAI信息，这里的DNAI信息指的是与第一会话对应的DNAI，或者称为与第一会话的标识对应的DNAI。
步骤610，SMF根据每一个PCC规则中的Traffic steering control information包括的DNAI信息，确定第一会话对应的DNAI。SMF向I-SMF1发送会话建立响应消息，该消息中携带第一会话对应的DNAI。相应地，I-SMF1可以接收到该会话建立响应消息。
该策略控制响应消息例如可以是Npcf_SMPolicyControl_Create Response消息。
步骤611，I-SMF1向AMF发送信息传递消息，以及AMF向I-SMF1返回信息传递应答消息。
该信息传递消息例如可以是Namf_Communication_N1N2MessageTransfer消息。
步骤612，AMF向RAN发送N2会话请求消息。相应地，RAN可以接收到该N2会话请求消息。
步骤613，RAN与UE交互，建立RRC连接。
步骤614，RAN向New AMF返回N2会话应答消息。相应地，New AMF可以接收到N2会话应答消息。
步骤615，New AMF向I-SMF1发送更新上下文请求消息。相应地，I-SMF1可以接收 到该更新上下文请求消息。
该更新上下文请求消息可以是Nsmf_PDUSession_UpdateSMcontext Request消息。
步骤616，I-SMF1更新N4会话。
步骤617，I-SMF1向New AMF返回更新上下文响应消息。相应地，New AMF可以接收到该更新上下文响应消息。
该更新上下文响应消息例如可以是Nsmf_PDUSession_UpdateSMcontext Response消息。
该更新上下文响应消息中包括第一会话对应的DNAI。
步骤618，New AMF保存第一会话对应的DNAI，根据第一会话对应的DNAI对I-SMF进行重选。AMF根据第一会话对应的DNAI选择支持全部DNAI或者部分DNAI的I-SMF(即I-SMF2)。其中，New AMF可以根据配置或者通过NRF查询获取支持第一会话对应的DNAI的I-SMF。
比如，重选的SMF为I-SMF2，进而该I-SMF2可以选择新的UPF(如图中所示的UPF2)作为PSA。由于该I-SMF2支持上述DNAI，则选择的UPF2也支持该DNAI，从而可以将该UPF2作为PSA，实现了为UE选择合适的PSA，即选择了支持与会话的标识对应的DNAI的PSA。
参考图7，本申请提供的又一种SMF的选择方法。需要说明的是，以下步骤701-步骤705与以下步骤706为二选一，即执行以下步骤701-步骤705，以及步骤707-步骤711(针对正在进行或未来的PDU会话)，或者执行以下步骤706-步骤711(针对正在进行的PDU会话)。
该方法包括以下步骤：
步骤701，AF向NEF发送请求消息。相应地，NEF可以接收到该请求消息。
该请求消息携带Traffic Steering Information，Traffic Steering Information中可以携带外部组标识或指示信息，该外部组标识用于指示该Traffic Steering Information适用于该外部组标识对应的一个或多个UE，该指示信息用于指示该Traffic Steering Information适用于所有UE。
该Traffic Steering Information中还携带有DNAI信息，该DNAI信息包括第一会话对应的DNAI。
该请求消息例如可以是Nnef_TrafficInfluence_Create Request消息。
步骤702，NEF向UDR发送请求消息，该请求消息携带Traffic Steering Information。相应地，UDR可以接收到该请求消息。
比如，该请求消息例如可以是Nudr_DataRepository_Create Request消息。
需要说明的是，若Traffic Steering Information携带外部组标识，则NEF还需要将外部组标识映射成内部组标识，即NEF向UDR发送的Traffic Steering Information携带内部组标识和上述DNAI信息。
若Traffic Steering Information上述指示信息，则NEF向UDR发送的Traffic Steering Information携带该指示信息和DNAI信息。
步骤703，UDR存储DNAI信息，并向NEF返回响应消息。相应地，NEF可以接收到该响应消息。
该响应消息例如可以是Nudr_DataRepository_Create Response消息。
其中，若Traffic Steering Information携带内部组标识，则UDR存储内部组标识与DNAI信息的对应关系；或者UDR先根据内部组标识确定与该内部组标识对应的UE的标识，然后存储UE的标识与DNAI信息的对应关系。
若Traffic Steering Information携带指示信息，则UDR存储DNAI信息，而不关联UE，表示该DNAI信息适用于所有UE。
步骤704，NEF向AF发送响应消息。相应的，AF可以接收到该相应消息。
该响应消息例如可以是Nnef_TrafficInfluence_Create Response消息。
该步骤704可选。
步骤705，UDR向所有订阅的SM-PCF发送通知消息，该通知消息携带Traffic Steering Information。相应地，SM-PCF可以接收到该通知消息。
步骤706，AF向SM-PCF发送策略授权消息，该消息包括Traffic steering information，该Traffic steering information携带第一会话对应的DNAI。相应地，SM-PCF可以接收到该Traffic steering information。
该策略授权消息例如可以是Npcf_Policy Authorziation消息。
需要说明的是，AF可以通过NEF，向SM-PCF发送策略授权消息。
步骤707，SM-PCF根据AF提供的Traffic Steering Information制定PCC规则，PCC规则中包括Traffic Steering Information。SM-PCF向SMF发送策略控制更新请求消息，该消息中携带更新PCC规则。SMF保存PCC规则后返回策略控制更新响应消息。
该策略控制更新请求消息例如可以是NPcf_AMPolicyControl_UpdateNotify Request消息。该策略控制更新响应消息例如可以是NPcf_AMPolicyControl_UpdateNotify Response消息。
需要说明的是，若Traffic Steering Information中携带内部组标识，则SM-PCF针对与该组标识对应的UE执行本步骤。若Traffic Steering Information中携带指示信息，则SM-PCF针对所有UE执行本步骤。
步骤708，SMF根据PCC规则中的Traffic Steering Information确定第一会话对应的DNAI，并向Old I-SMF发送会话更新请求消息，该消息中携带更新的DNAI。相应地，Old I-SMF可以接收到会话更新请求消息。
若是以全量更新的方式，则这里的更新的DNAI包括第一会话对应的所有的DNAI。若是以增量更新的方式，则这里的更新的DNAI包括第一会话对应的新增的DNAI。
步骤709，Old I-SMF向AMF发送更新上下文请求消息，该消息中携带更新的DNAI。相应地，AMF可以接收到更新上下文请求消息。
该更新上下文请求消息可以是Nsmf_PDUSession_UpdateSMContext Request消息。
步骤710，Old I-SMF向SMF发送会话更新响应消息。相应地，Old I-SMF可以接收到会话更新响应消息。
该步骤可选。
步骤711，AMF根据更新后的DNAI对I-SMF进行重选。
AMF根据更新后的DNAI确定第一会话对应的最新的DNAI，然后选择支持该最新的DNAI中的部分或全部DNAI的I-SMF。即重选之前的I-SMF为图7所示的Old I-SMF，重选之后的I-SMF为图7所示的New I-SMF。
由于该New I-SMF支持上述DNAI，则选择的New I-UPF也支持该DNAI，从而可以 将该New I-UPF作为PSA，实现了为UE选择合适的PSA，即选择了支持与会话的标识对应的DNAI的PSA。
进一步地，参考图8，本申请还提供一种SMF的注册方法，该方法中，I-SMF可以在向NRF注册的过程中，将自身支持DNAI发送给NRF，从而AMF可以获知各个I-SMF分别支持的DNAI。即该实施例可以与图4-图7所示的实施例相结合。其中，该I-SMF可以是前述实施例中的第一SMF、第二SMF、第四SMF等。
该方法包括以下步骤：
步骤801，I-SMF向NRF发送注册请求消息，注册请求消息包括SMF的标识和SMF支持的DNAI。相应地，NRF可以接收到该注册请求消息。
该注册请求消息例如可以是Nnrf_NFManagement_NFRegister Request消息。
作为一种实现方法，该注册请求消息中可以携带I-SMF的NF profile，该NF profile包括I-SMF支持的DNAI。
步骤802，NRF存储SMF的标识和SMF支持的DNAI之间的对应关系。
若注册请求消息中包括NF profile，则NRF存储该NF profile。
步骤803，NRF向SMF发送注册响应消息，注册响应消息用于确定注册完成。相应地，NRF可以接收到该注册响应消息。
该注册请求消息例如可以是Nnrf_NFfManagement_NFRegister_Response消息。
基于该实施例，NRF获取I-SMF支持的DNAI，以便AMF能够查询到I-SMF支持的DNAI。
上述主要从各个网元之间交互的角度对本申请提供的方案进行了介绍。可以理解的是，上述实现各网元为了实现上述功能，其包含了执行各个功能相应的硬件结构和/或软件模块。本领域技术人员应该很容易意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，本发明能够以硬件或硬件和计算机软件的结合形式来实现。某个功能究竟以硬件还是计算机软件驱动硬件的方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本发明的范围。
如图9所示，为本申请所涉及的装置的一种可能的示例性框图，该装置900可以以软件或硬件的形式存在。装置900可以包括：处理单元902和通信单元901。作为一种实现方式，该通信单元901可以包括接收单元和发送单元。处理单元902用于对装置900的动作进行控制管理。通信单元901用于支持装置900与其他网络实体的通信。
其中，处理单元902可以是处理器或控制器，例如可以是通用中央处理器(central processing unit，CPU)，通用处理器，数字信号处理(digital signal processing，DSP)，专用集成电路(application specific integrated circuits，ASIC)，现场可编程门阵列(field programmable gate array，FPGA)或者其他可编程逻辑器件、晶体管逻辑器件、硬件部件或者其任意组合。其可以实现或执行结合本申请公开内容所描述的各种示例性的逻辑方框，模块和电路。所述处理器也可以是实现计算功能的组合，例如包括一个或多个微处理器组合，DSP和微处理器的组合等等。通信单元901是一种该装置的接口电路，用于从其它装置接收信号。例如，当该装置以芯片的方式实现时，该通信单元901是该芯片用于从其它芯片或装置接收信号的接口电路，或者，是该芯片用于向其它芯片或装置发送信号的接 口电路。
该装置900可以为上述实施例中的移动性管理网元、会话管理网元、策略控制网元、或网络存储网元，还可以为用于移动性管理网元、会话管理网元、策略控制网元、或网络存储网元的芯片。例如，当装置900为移动性管理网元、会话管理网元、策略控制网元、或网络存储网元时，该处理单元902例如可以是处理器，该通信单元901例如可以是收发器。可选的，该收发器可以包括射频电路，该存储单元例如可以是存储器。例如，当装置900为用于移动性管理网元、会话管理网元、策略控制网元、或网络存储网元的芯片时，该处理单元902例如可以是处理器，该通信单元901例如可以是输入/输出接口、管脚或电路等。该处理单元902可执行存储单元存储的计算机执行指令，可选地，该存储单元为该芯片内的存储单元，如寄存器、缓存等，该存储单元还可以是该移动性管理网元、会话管理网元、策略控制网元、或网络存储网元内的位于该芯片外部的存储单元，如只读存储器(read-only memory，ROM)或可存储静态信息和指令的其他类型的静态存储设备，随机存取存储器(random access memory，RAM)等。
在第一个实施例中，该装置为上述实施例中的移动性管理网元。处理单元902，用于确定与终端设备的第一会话对应的第一DNAI；通信单元901，用于为所述终端设备的所述第一会话选择支持所述第一DNAI中的全部或部分DNAI的第一会话管理网元。
在一种可能的实现方法中，所述处理单元902，用于确定与终端设备的第一会话对应的第一数据网络接入标识DNAI，具体包括：通过所述通信单元901获取第一信息，所述第一信息包括所述终端设备的会话的标识和所述终端设备的会话的标识对应的第二DNAI，所述第二DNAI为一个或多个DNAI，所述终端设备的会话的标识包括所述第一会话的标识；通过所述通信单元901获取所述第一会话的标识；根据所述第一会话的标识和所述第一信息，确定所述第一会话对应的所述第一DNAI。
在一种可能的实现方法中，所述通信单元901，还用于获取第二信息，所述第二信息包括所述第一会话的标识和所述第一会话的标识对应的第三DNAI，所述第三DNAI为一个或多个DNAI；所述处理单元902，还用于根据所述第三DNAI，确定第四DNAI；以及，为所述终端设备的所述第一会话选择支持所述第四DNAI中的全部或部分DNAI的第二会话管理网元。
在一种可能的实现方法中，所述第四DNAI与所述第三DNAI相同；或者，所述第四DNAI包括所述第一DNAI和所述第三DNAI。
在一种可能的实现方法中，所述通信单元901，用于获取第一信息，具体包括：接收来自策略控制网元或其他移动性管理网元的所述第一信息。
在一种可能的实现方法中，所述通信单元901，用于获取所述第一会话的标识，包括：接收来自所述终端设备的请求消息，所述请求消息包括所述第一会话的标识，所述请求消息用于请求建立所述第一会话；或者，从其他移动性管理网元接收所述终端设备的上下文信息，所述上下文信息中包括所述第一会话的标识。
在一种可能的实现方法中，所述处理单元902，用于确定与终端设备的第一会话对应的第一DNAI，具体包括：通过所述通信单元901接收来自策略控制网元或其他移动性管理网元的所述第一会话对应的所述第一DNAI。
在一种可能的实现方法中，所述处理单元902，还用于为所述终端设备的所述第一会话选择第三会话管理网元；所述处理单元902，用于为所述第一会话选择支持所述第一 DNAI中的全部或部分DNAI的第一会话管理网元，具体包括：确定所述第三会话管理网元不支持所述第一DNAI中的全部或部分DNAI，则为所述第一会话选择支持所述第一DNAI中的全部或部分DNAI的第一会话管理网元。
在一种可能的实现方法中，所述通信单元901，还用于接收来自所述策略控制网元的所述第一会话对应的第五DNAI，所述第五DNAI为一个或多个DNAI；所述处理单元902，还用于根据所述第五DNAI，确定第六DNAI；以及，为所述终端设备的所述第一会话选择支持所述第六DNAI中的全部或部分DNAI的第四会话管理网元。
在一种可能的实现方法中，所述第六DNAI与所述第五DNAI相同；或者，所述第六DNAI包括所述第一DNAI和所述第五DNAI。
在一种可能的实现方法中，所述第一会话的标识包括以下一项或多项：DNN、S-NSSAI。
在一种可能的实现方法中，所述通信单元901还用于从网络存储网元获取所述第一会话管理网元支持的DNAI。
在第二个实施例中，该装置为上述实施例中的策略控制网元。处理单元902，用于获取第一信息，所述第一信息包括所述终端设备的会话的标识和所述终端设备的会话的标识对应的第二DNAI，所述第二DNAI为一个或多个DNAI；通信单元901，用于向移动性管理网元发送所述第一信息，所述第一信息用于所述移动性管理网元选择会话管理网元。
在一种可能的实现方法中，所述策略控制网元向移动性管理网元发送所述第一信息，包括：所述策略控制网元在所述终端设备的注册过程中，向所述移动性管理网元发送所述第一信息。
在第三个实施例中，该装置为上述实施例中的策略控制网元。处理单元902，用于获取终端设备的第一会话对应的第一DNAI；通信单元901，用于向移动性管理网元发送所述第一会话对应的所述第一DNAI。
在一种可能的实现方法中，所述策略控制网元向移动性管理网元发送所述第一会话对应的所述第一DNAI，包括：所述策略控制网元在会话建立过程中，向所述移动性管理网元发送所述第一会话对应的所述第一DNAI。
在第四个实施例中，该装置为上述实施例中的会话管理网元。通信单元901，用于：向网络存储网元发送注册请求消息，所述注册请求消息包括所述会话管理网元的标识和所述会话管理网元支持的DNAI；以及，从所述网络存储网元接收注册响应消息，所述注册响应消息用于确定注册完成。
在第五个实施例中，该装置为上述实施例中的网络存储网元。通信单元901，用于从会话管理网元接收注册请求消息，所述注册请求消息包括所述会话管理网元的标识和所述会话管理网元支持的DNAI；以及，向所述会话管理网元发送注册响应消息，所述注册响应消息用于确定注册完成；存储单元，用于存储所述会话管理网元的标识和所述会话管理网元支持的DNAI之间的对应关系。
可以理解的是，该装置用于上述会话管理网元的选择方法时的具体实现过程以及相应的有益效果，可以参考前述方法实施例中的相关描述，这里不再赘述。
若该装置是移动性管理网元、会话管理网元、策略控制网元、或网络存储网元，则移动性管理网元、会话管理网元、策略控制网元、或网络存储网元以采用集成的方式划分各个功能模块的形式来呈现。这里的“模块”可以指特定ASIC，电路，执行一个或多个软件或固件程序的处理器和存储器，集成逻辑电路，和/或其他可以提供上述功能的器件。在一个 简单的实施例中，本领域的技术人员可以想到该移动性管理网元、会话管理网元、策略控制网元、或网络存储网元可以采用图10所示的形式。
比如，图10中的处理器1002可以通过调用存储器1001中存储的计算机执行指令，使得移动性管理网元、会话管理网元、策略控制网元、或网络存储网元执行上述方法实施例中的方法。
具体的，图9中的通信单元901、处理单元902的功能/实现过程可以通过图10中的处理器1002调用存储器1001中存储的计算机执行指令来实现。或者，图9中的处理单元902的功能/实现过程可以通过图10中的处理器1002调用存储器1001中存储的计算机执行指令来实现，图9中的通信单元901的功能/实现过程可以通过图10中的通信接口1003来实现。
可选的，当该装置900是芯片或电路时，则通信单元901的功能/实现过程还可以通过管脚或电路等来实现。
如图10所示，为本申请提供的又一种装置示意图，该装置可以是上述实施例中的移动性管理网元、会话管理网元、策略控制网元、或网络存储网元。该装置1000包括：处理器1002和通信接口1003，可选的，装置1000还可以包括存储器1001。可选的，装置1000还可以包括通信线路1004。其中，通信接口1003、处理器1002以及存储器1001可以通过通信线路1004相互连接；通信线路1004可以是外设部件互连标准(peripheral component interconnect，简称PCI)总线或扩展工业标准结构(extended industry standard architecture，简称EISA)总线等。所述通信线路1004可以分为地址总线、数据总线、控制总线等。为便于表示，图10中仅用一条粗线表示，但并不表示仅有一根总线或一种类型的总线。
处理器1002可以是一个CPU，微处理器，ASIC，或一个或多个用于控制本申请方案程序执行的集成电路。
通信接口1003，使用任何收发器一类的装置，用于与其他设备或通信网络通信，如以太网，无线接入网(radio access network，RAN)，无线局域网(wireless local area networks，WLAN)，有线接入网等。
存储器1001可以是ROM或可存储静态信息和指令的其他类型的静态存储设备，RAM或者可存储信息和指令的其他类型的动态存储设备，也可以是电可擦可编程只读存储器(electrically erasable programmable read-only memory，EEPROM)、只读光盘(compact disc read-only memory，CD-ROM)或其他光盘存储、光碟存储(包括压缩光碟、激光碟、光碟、数字通用光碟、蓝光光碟等)、磁盘存储介质或者其他磁存储设备、或者能够用于携带或存储具有指令或数据结构形式的期望的程序代码并能够由计算机存取的任何其他介质，但不限于此。存储器可以是独立存在，通过通信线路1004与处理器相连接。存储器也可以和处理器集成在一起。
其中，存储器1001用于存储执行本申请方案的计算机执行指令，并由处理器1002来控制执行。处理器1002用于执行存储器1001中存储的计算机执行指令，从而实现本申请上述实施例提供的会话管理网元的选择方法。
可选的，本申请实施例中的计算机执行指令也可以称之为应用程序代码，本申请实施例对此不作具体限定。
本领域普通技术人员可以理解：本申请中涉及的第一、第二等各种数字编号仅为描述方便进行的区分，并不用来限制本申请实施例的范围，也表示先后顺序。“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。“至少一个”是指一个或者多个。至少两个是指两个或者多个。“至少一个”、“任意一个”或其类似表达，是指的这些项中的任意组合，包括单项(个)或复数项(个)的任意组合。例如，a,b,或c中的至少一项(个、种)，可以表示：a,b,c,a-b,a-c,b-c,或a-b-c，其中a,b,c可以是单个，也可以是多个。“多个”是指两个或两个以上，其它量词与之类似。此外，对于单数形式“a”，“an”和“the”出现的元素(element)，除非上下文另有明确规定，否则其不意味着“一个或仅一个”，而是意味着“一个或多于一个”。例如，“a device”意味着对一个或多个这样的device。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。所述计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行所述计算机程序指令时，全部或部分地产生按照本申请实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如同轴电缆、光纤、数字用户线(DSL))或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包括一个或多个可用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质，(例如，软盘、硬盘、磁带)、光介质(例如，DVD)、或者半导体介质(例如固态硬盘(Solid State Disk，SSD))等。
本申请实施例中所描述的各种说明性的逻辑单元和电路可以通过通用处理器，数字信号处理器，专用集成电路(ASIC)，现场可编程门阵列(FPGA)或其它可编程逻辑装置，离散门或晶体管逻辑，离散硬件部件，或上述任何组合的设计来实现或操作所描述的功能。通用处理器可以为微处理器，可选地，该通用处理器也可以为任何传统的处理器、控制器、微控制器或状态机。处理器也可以通过计算装置的组合来实现，例如数字信号处理器和微处理器，多个微处理器，一个或多个微处理器联合一个数字信号处理器核，或任何其它类似的配置来实现。
本申请实施例中所描述的方法或算法的步骤可以直接嵌入硬件、处理器执行的软件单元、或者这两者的结合。软件单元可以存储于RAM存储器、闪存、ROM存储器、EPROM存储器、EEPROM存储器、寄存器、硬盘、可移动磁盘、CD-ROM或本领域中其它任意形式的存储媒介中。示例性地，存储媒介可以与处理器连接，以使得处理器可以从存储媒介中读取信息，并可以向存储媒介存写信息。可选地，存储媒介还可以集成到处理器中。处理器和存储媒介可以设置于ASIC中。
这些计算机程序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。
尽管结合具体特征及其实施例对本申请进行了描述，显而易见的，在不脱离本申请的精神和范围的情况下，可对其进行各种修改和组合。相应地，本说明书和附图仅仅是所附 权利要求所界定的本申请的示例性说明，且视为已覆盖本申请范围内的任意和所有修改、变化、组合或等同物。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，则本申请也意图包括这些改动和变型在内。

Claims (41)

  1. 一种会话管理网元的选择方法，其特征在于，包括：
    移动性管理网元确定与终端设备的第一会话对应的第一数据网络接入标识DNAI；
    所述移动性管理网元为所述终端设备的所述第一会话选择支持所述第一DNAI中的全部或部分DNAI的第一会话管理网元。
  2. 如权利要求1所述的方法，其特征在于，所述移动性管理网元确定与终端设备的第一会话对应的第一DNAI，包括：
    所述移动性管理网元获取第一信息，所述第一信息包括所述终端设备的会话的标识和所述终端设备的会话的标识对应的第二DNAI，所述终端设备的会话的标识包括所述第一会话的标识，所述第二DNAI为一个或多个DNAI；
    所述移动性管理网元获取所述第一会话的标识；
    所述移动性管理网元根据所述第一会话的标识和所述第一信息，确定所述第一会话对应的所述第一DNAI。
  3. 如权利要求2所述的方法，其特征在于，还包括：
    所述移动性管理网元获取第二信息，所述第二信息包括所述第一会话的标识和所述第一会话的标识对应的第三DNAI，所述第三DNAI为一个或多个DNAI；
    所述移动性管理网元根据所述第三DNAI，确定第四DNAI；
    所述移动性管理网元为所述终端设备的所述第一会话选择支持所述第四DNAI中的全部或部分DNAI的第二会话管理网元。
  4. 如权利要求3所述的方法，其特征在于，所述第四DNAI与所述第三DNAI相同；或者，
    所述第四DNAI包括所述第一DNAI和所述第三DNAI。
  5. 如权利要求2-4任一所述的方法，其特征在于，所述移动性管理网元获取第一信息，包括：
    所述移动性管理网元接收来自策略控制网元或其他移动性管理网元的所述第一信息。
  6. 如权利要求2-4任一所述的方法，其特征在于，所述移动性管理网元获取所述第一会话的标识，包括：
    所述移动性管理网元接收来自所述终端设备的请求消息，所述请求消息包括所述第一会话的标识，所述请求消息用于请求建立所述第一会话；或者，
    所述移动性管理网元从其他移动性管理网元接收所述终端设备的上下文信息，所述上下文信息中包括所述第一会话的标识。
  7. 如权利要求1所述的方法，其特征在于，所述移动性管理网元确定与终端设备的第一会话对应的第一DNAI，包括：
    所述移动性管理网元接收来自策略控制网元或其他移动性管理网元的所述第一会话对应的所述第一DNAI。
  8. 如权利要求7所述的方法，其特征在于，还包括：
    所述移动性管理网元为所述终端设备的所述第一会话选择第三会话管理网元；
    所述移动性管理网元为所述第一会话选择支持所述第一DNAI中的全部或部分DNAI的第一会话管理网元，包括：
    所述移动性管理网元确定所述第三会话管理网元不支持所述第一DNAI中的全部或部分DNAI，则为所述第一会话选择支持所述第一DNAI中的全部或部分DNAI的第一会话管理网元。
  9. 如权利要求7或8所述的方法，其特征在于，还包括：
    所述移动性管理网元接收来自所述策略控制网元的所述第一会话对应的第五DNAI，所述第五DNAI为一个或多个DNAI；
    所述移动性管理网元根据所述第五DNAI，确定第六DNAI；
    所述移动性管理网元为所述终端设备的所述第一会话选择支持所述第六DNAI中的全部或部分DNAI的第四会话管理网元。
  10. 如权利要求9所述的方法，其特征在于，所述第六DNAI与所述第五DNAI相同；或者，
    所述第六DNAI包括所述第一DNAI和所述第五DNAI。
  11. 如权利要求1-10任一所述的方法，其特征在于，所述第一会话的标识包括以下一项或多项：
    数据网络名称DNN、单网络切片选择辅助信息S-NSSAI。
  12. 如权利要求1-11任一项所述的方法，其特征在于，所述方法还包括，
    所述移动性管理网元从网络存储网元获取所述第一会话管理网元支持的DNAI。
  13. 一种会话管理网元的选择装置，其特征在于，包括：
    处理单元，用于确定与终端设备的第一会话对应的第一数据网络接入标识DNAI；
    通信单元，用于为所述终端设备的所述第一会话选择支持所述第一DNAI中的全部或部分DNAI的第一会话管理网元。
  14. 如权利要求13所述的装置，其特征在于，所述处理单元，用于确定与终端设备的第一会话对应的第一数据网络接入标识DNAI，具体包括：
    用于通过所述通信单元获取第一信息，所述第一信息包括所述终端设备的会话的标识和所述终端设备的会话的标识对应的第二DNAI，所述第二DNAI为一个或多个DNAI，所述终端设备的会话的标识包括所述第一会话的标识；通过所述通信单元获取所述第一会话的标识；以及，根据所述第一会话的标识和所述第一信息，确定所述第一会话对应的所述第一DNAI。
  15. 如权利要求14所述的装置，其特征在于，所述通信单元，还用于获取第二信息，所述第二信息包括所述第一会话的标识和所述第一会话的标识对应的第三DNAI，所述第三DNAI为一个或多个DNAI；
    所述处理单元，还用于根据所述第三DNAI，确定第四DNAI；以及，为所述终端设备的所述第一会话选择支持所述第四DNAI中的全部或部分DNAI的第二会话管理网元。
  16. 如权利要求14或15所述的装置，其特征在于，所述通信单元，用于获取第一信息，具体包括：用于接收来自策略控制网元或其他移动性管理网元的所述第一信息。
  17. 如权利要求14-16任一所述的装置，其特征在于，所述通信单元，用于获取所述第一会话的标识，包括：用于接收来自所述终端设备的请求消息，所述请求消息包括所述第一会话的标识，所述请求消息用于请求建立所述第一会话；或者，
    用于从其他移动性管理网元接收所述终端设备的上下文信息，所述上下文信息中包括所述第一会话的标识。
  18. 如权利要求13所述的装置，其特征在于，所述处理单元，用于确定与终端设备的第一会话对应的第一DNAI，具体包括：用于通过所述通信单元接收来自策略控制网元或其他移动性管理网元的所述第一会话对应的所述第一DNAI。
  19. 如权利要求18所述的装置，其特征在于，所述处理单元，还用于为所述终端设备的所述第一会话选择第三会话管理网元；
    所述处理单元，用于为所述第一会话选择支持所述第一DNAI中的全部或部分DNAI的第一会话管理网元，具体包括：用于确定所述第三会话管理网元不支持所述第一DNAI中的全部或部分DNAI，则为所述第一会话选择支持所述第一DNAI中的全部或部分DNAI的第一会话管理网元。
  20. 如权利要求18或19所述的装置，其特征在于，所述通信单元，还用于接收来自所述策略控制网元的所述第一会话对应的第五DNAI，所述第五DNAI为一个或多个DNAI；
    所述处理单元，还用于根据所述第五DNAI，确定第六DNAI；以及，为所述终端设备的所述第一会话选择支持所述第六DNAI中的全部或部分DNAI的第四会话管理网元。
  21. 如权利要求13-20任一项所述的装置，其特征在于，所述通信单元还用于从网络存储网元获取所述第一会话管理网元支持的DNAI。
  22. 一种会话管理网元的选择系统，其特征在于，包括移动性管理网元和第一会话管理网元；
    所述移动性管理网元，用于确定与终端设备的第一会话对应的第一数据网络接入标识DNAI；以及，为所述终端设备的所述第一会话选择支持所述第一DNAI中的全部或部分DNAI的所述第一会话管理网元。
  23. 如权利要求22所述的系统，其特征在于，所述移动性管理网元，用于确定与终端设备的第一会话对应的第一DNAI，包括：用于获取第一信息，所述第一信息包括所述终端设备的会话的标识和所述终端设备的会话的标识对应的第二DNAI，所述第二DNAI为一个或多个DNAI，所述终端设备的会话的标识包括所述第一会话的标识；获取所述第一会话的标识；以及，根据所述第一会话的标识和所述第一信息，确定所述第一会话对应的所述第一DNAI。
  24. 如权利要求23所述的系统，其特征在于，所述移动性管理网元，还用于：获取第二信息，所述第二信息包括所述第一会话的标识和所述第一会话的标识对应的第三DNAI，所述第三DNAI为一个或多个DNAI；根据所述第三DNAI，确定第四DNAI；以及，为所述终端设备的所述第一会话选择支持所述第四DNAI中的全部或部分DNAI的第二会话管理网元。
  25. 如权利要求23或24所述的系统，其特征在于，所述系统还包括策略控制网元；
    所述策略控制网元，用于获取所述第一信息；以及，向所述移动性管理网元发送所述第一信息；
    所述移动性管理网元，用于获取第一信息，具体包括：用于接收来自所述策略控制网元的所述第一信息。
  26. 如权利要求25所述的系统，其特征在于，所述策略控制网元用于向所述移动性管理网元发送所述第一信息，具体包括：用于在所述终端设备的注册过程中，向所述移动性管理网元发送所述第一信息。
  27. 如权利要求23或24所述的系统，其特征在于，所述移动性管理网元用于获取第 一信息，具体包括：用于接收来自其他移动性管理网元的所述第一信息。
  28. 如权利要求23-27任一所述的系统，其特征在于，所述移动性管理网元用于获取所述第一会话的标识，包括：用于接收来自所述终端设备的请求消息，所述请求消息包括所述第一会话的标识，所述请求消息用于请求建立所述第一会话；或者，用于从其他移动性管理网元接收所述终端设备的上下文信息，所述上下文信息中包括所述第一会话的标识。
  29. 如权利要求22所述的系统，其特征在于，所述系统还包括策略控制网元；
    所述策略控制网元，用于获取所述终端设备的所述第一会话对应的所述第一DNAI；以及，向所述移动性管理网元发送所述第一会话对应的所述第一DNAI；
    所述移动性管理网元，用于确定与终端设备的第一会话对应的第一DNAI，具体包括：用于接收来自所述策略控制网元的所述第一会话对应的所述第一DNAI。
  30. 如权利要求29所述的系统，其特征在于，所述移动性管理网元还用于为所述终端设备的所述第一会话选择第三会话管理网元；
    所述移动性管理网元，用于为所述第一会话选择支持所述第一DNAI中的全部或部分DNAI的第一会话管理网元，具体包括：用于确定所述第三会话管理网元不支持所述第一DNAI中的全部或部分DNAI，则为所述第一会话选择支持所述第一DNAI中的全部或部分DNAI的第一会话管理网元。
  31. 如权利要求29或30所述的系统，其特征在于，所述移动性管理网元，还用于：接收来自所述策略控制网元的所述第一会话对应的第五DNAI，所述第五DNAI为一个或多个DNAI；根据所述第五DNAI，确定第六DNAI；以及，为所述终端设备的所述第一会话选择支持所述第六DNAI中的全部或部分DNAI的第四会话管理网元。
  32. 如权利要求22-31任一项所述的系统，其特征在于，所述移动性管理网元，用于为所述终端设备的所述第一会话选择支持所述第一DNAI中的全部或部分DNAI的所述第一会话管理网元，包括：
    用于根据所述第一DNAI和所述第一会话管理网元支持的DNAI，为所述终端设备的所述第一会话选择支持所述第一DNAI中的全部或部分DNAI的所述第一会话管理网元。
  33. 如权利要求32所述的系统，其特征在于，所述系统还包括网络存储网元；
    所述移动性管理网元，还用于从所述网络存储网元获取所述第一会话管理网元支持的DNAI。
  34. 如权利要求33所述的系统，其特征在于，
    所述第一会话管理网元，用于向所述网络存储网元发送注册请求消息，所述注册请求消息包括所述第一会话管理网元的标识和所述第一会话管理网元支持的DNAI；以及，从所述网络存储网元接收注册响应消息，所述注册响应消息用于确定注册完成；
    所述网络存储网元，用于从所述第一会话管理网元接收所述注册请求消息；存储所述第一会话管理网元的标识和所述第一会话管理网元支持的DNAI之间的对应关系；以及，向所述第一会话管理网元发送所述注册响应消息。
  35. 一种移动性管理网元，其特征在于，包括：处理器和存储器；所述存储器用于存储计算机执行指令，当所述移动性管理网元运行时，所述处理器执行所述存储器存储的所述计算机执行指令，以使所述移动性管理网元执行如权利要求1-12任一项所述的会话管理网元的选择方法。
  36. 一种处理装置，其特征在于，包括：
    存储器，用于存储计算机程序；
    处理器，用于从所述存储器调用并运行所述计算机程序，以执行如权利要求1-12任一项所述的会话管理网元的选择方法。
  37. 一种处理器，其特征在于，用于执行如利要求1-12任一项所述的会话管理网元的选择方法。
  38. 一种芯片系统，其特征在于，包括：
    存储器，用于存储计算机程序；
    处理器，用于从所述存储器调用并运行所述计算机程序，使得安装有所述芯片系统的设备执行如利要求1-12任一项所述的会话管理网元的选择方法。
  39. 一种计算机可读存储介质，其特征在于，包括计算机程序，当其在计算机上运行时，使得所述计算机执行如利要求1-12任一项所述的会话管理网元的选择方法。
  40. 一种计算机程序产品，其特征在于，所述计算机程序产品包括计算机程序，当所述计算机程序在计算机上运行时，使得计算机执行如利要求1-12任一项所述的会话管理网元的选择方法。
  41. 一种通信装置，其特征在于，所述装置用来执行权利要求1-12任一项所述的会话管理网元的选择方法。
PCT/CN2020/086879 2019-07-23 2020-04-24 一种会话管理网元的选择方法、装置及系统 WO2021012736A1 (zh)

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