WO2021088894A1 - 一种支持会话和服务连续性模式选择的方法及装置 - Google Patents

一种支持会话和服务连续性模式选择的方法及装置 Download PDF

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Publication number
WO2021088894A1
WO2021088894A1 PCT/CN2020/126571 CN2020126571W WO2021088894A1 WO 2021088894 A1 WO2021088894 A1 WO 2021088894A1 CN 2020126571 W CN2020126571 W CN 2020126571W WO 2021088894 A1 WO2021088894 A1 WO 2021088894A1
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Prior art keywords
session
network
user equipment
service continuity
continuity mode
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PCT/CN2020/126571
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English (en)
French (fr)
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唐伟杰
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中兴通讯股份有限公司
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Priority to US17/616,181 priority Critical patent/US20220248313A1/en
Priority to EP20885517.1A priority patent/EP3979681A4/en
Priority to KR1020217037000A priority patent/KR20210151205A/ko
Publication of WO2021088894A1 publication Critical patent/WO2021088894A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/18—Processing of user or subscriber data, e.g. subscribed services, user preferences or user profiles; Transfer of user or subscriber data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/18—Selecting a network or a communication service
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0033—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H04W36/144—Reselecting a network or an air interface over a different radio air interface technology
    • 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
    • H04W8/04—Registration at HLR or HSS [Home Subscriber Server]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/22—Processing or transfer of terminal data, e.g. status or physical capabilities
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/02—Buffering or recovering information during reselection ; Modification of the traffic flow during hand-off
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W60/00—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
    • H04W60/04—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration using triggered events
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/18—Processing of user or subscriber data, e.g. subscribed services, user preferences or user profiles; Transfer of user or subscriber data
    • H04W8/20—Transfer of user or subscriber data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/22—Processing or transfer of terminal data, e.g. status or physical capabilities
    • H04W8/24—Transfer of terminal data

Definitions

  • This application relates to the field of communication technology, and in particular to a method and device for supporting session and service continuity mode selection.
  • EPS Evolved Packet System
  • 5GS 5th-Generation System, fifth-generation mobile communication technology system
  • UE User Equipment, user terminal
  • MME Mobility Management Entity
  • E-UTRAN Evolved UMTS Terrestrial Radio Access Network, evolved UMTS (Universal Mobile Telecommunications System) terrestrial radio access network), Mobile management entity
  • the EPS system includes the following network elements: E-URTAN, MME, SGW (Serving Gateway), SMF (Session Management Function, session management function) + PGW-C (PDN (Packet Data Network, packet data network) Gateway Control, PDN gateway control plane), UPF (User Plane Function, user plane function) + PGW-U (PDN (Packet Data Network, packet data network) Gateway User, PDN gateway user plane), HSS (Home Subscriber Server, home subscriber server )+UDM (Unified Data Management, unified data management).
  • PGW-C Packet Data Network, packet data network
  • PDN gateway control plane Gateway Control
  • UPF User Plane Function, user plane function
  • PGW-U Packet Data Network, packet data network
  • HSS Home Subscriber Server, home subscriber server
  • UDM Unified Data Management, unified data management
  • HSS+UDM is a collection of HSS and UDM functions
  • SMF+PGW-C is a collection of SMF and PGW-C functions
  • UPF+PGW-U is a collection of UPF and PGW-U functions.
  • the EPS system actually includes PGW-C in SMF+PGW-C, PGW-U in UPF+PGW-U, and UDM in HSS+UDM.
  • the UE is connected to AMF (Access Management Function, Access Management Function) through NG-RAN (NG and Radio Access Network).
  • AMF Access Management Function, Access Management Function
  • NG-RAN NG and Radio Access Network
  • the interface between UE and AMF is N1 interface
  • the interface between NG-RAN and AMF is N2 interface
  • the interface between NG-RAN and UPF+PGW-U is N3 interface
  • the interface between is N10 interface
  • the interface between SMF+PGW-C and UPF+PGW-U is N4 interface. What the 5GS system actually contains is SMF in SMF+PGW-C, UPF in UPF+PGW-U, and HSS in HSS+UDM.
  • the UE will carry the PDU Session ID to the network side in the attach request message.
  • the PDU Session ID indicates that the UE supports 5GS, which also means that the current session may be switched to 5GS in the future, and the network side session will be set up.
  • the pre-switching processing of the system for example, the establishment of QoS (Quality of Service, quality of service) rule mapping and QoS flow descriptions (QoS flow descriptions) and other information.
  • the EPS session establishment process may include the following steps:
  • Step 200 The UE initiates an attach request to an eNodeB (Evolved Node B), and carries a PDU Session ID (PDU Session ID);
  • eNodeB Evolved Node B
  • PDU Session ID PDU Session ID
  • Step 201 The eNodeB selects the MME, initiates an attachment request to the MME, and carries PDU Session ID information;
  • Step 202 MME selects SGW and PGW-C+SMF, initiates a session establishment request to SGW (Serving Gateway), and carries PDU Session ID information;
  • Step 203 The SGW allocates relevant tunnel resources, establishes a session, and sends a session establishment request to PGW-C+SMF, carrying PDU Session ID information;
  • Step 204 PGW-C+SMF is used as PGW-C to create 4G (the 4th Generation mobile communication technology, fourth-generation mobile communication technology) related resources, according to the handover indication carried in the indication identifier (Indication) in the session establishment request message, In order to switch to 5GS for pre-switching after the current session, perform related parameter conversion based on PDU Session ID and IMSI (International Mobile Subscriber Identity, International Mobile Subscriber Identity) related information, and send a policy session establishment request to PCF;
  • 4G the 4th Generation mobile communication technology, fourth-generation mobile communication technology
  • IMSI International Mobile Subscriber Identity, International Mobile Subscriber Identity
  • Step 205 The PCF establishes resources related to the policy session, and sends a successful session establishment response to PGW-C+SMF;
  • Step 206 PGW-C+SMF selects UPF, and sends a PFCP (Packet Forwarding Control Protocol) session establishment request message to UPF;
  • PFCP Packet Forwarding Control Protocol
  • Step 207 UPF establishes PFCP session resources, and sends a PFCP session establishment success response to PGW-C+SMF;
  • Step 208 PGW-C+SMF replies to the SGW session establishment response, carrying the resource information allocated by PGW-C and QoS Rule, AMBR (Aggregate Maximum Bit Rate), NSSAI (Network Slice Selection Assistance Information, network slice selection) Auxiliary information) and QoS flow descriptions and other information;
  • AMBR Aggregate Maximum Bit Rate
  • NSSAI Network Slice Selection Assistance Information, network slice selection
  • Step 209 The SGW replies to the MME session establishment response, which carries the resource information allocated by the SGW and PGW-C, and information such as QoS Rule, AMBR, NSSAI, and QoS flow descriptions;
  • Step 210 After receiving the session establishment response, the MME sends an attach acceptance response to the eNodeB;
  • step 211 the eNodeB transparently transmits the attach acceptance response to the UE, and the UE session establishment is completed.
  • the UE switches from an EPS session to a 5GS PDU (Protocol Data Unit) session.
  • 5GS PDU Protocol Data Unit
  • the switching process from an EPS session to a 5GS PDU session may include the following steps:
  • step 300 the UE initiates EPS session establishment, and when the session is established, it indicates that it supports handover;
  • Step 301 due to the location of the UE or the change in signal strength, the UE is required to switch to the 5GS network and initiate a switch request from EPS to 5GS;
  • step 302 the AMF initiates a request to create an SM (Session Management) context to the SMF, and the SMF performs resource switching conversion;
  • SM Session Management
  • Step 303 SMF initiates a 5GS registration request to UDM+HSS; UDM+HSS processes the registration request and responds with a successful registration response;
  • Step 304 SMF interacts with PGW-U+UPF, initiates an N4 port update message, and establishes user tunnel information for the 5GS session;
  • Step 305 The SMF sends a create SM context response message to the AMF, which carries the N3 interface tunnel information of the UPF;
  • Step 306 the AMF and the (R)AN perform EPS to 5GS handover request interaction, and transfer relevant information;
  • Step 307 the AMF initiates an update SM context request to the SMF, carrying N3 tunnel information of the (R)AN;
  • Step 308 SMF interacts with PGW-U+UPF to initiate an N4 port update message to update user tunnel information of the 5GS session;
  • step 309 the SMF sends an update SM context response message to the AMF, and the PDU session update is successful;
  • Step 310 After the UE and the (R)AN are ready to switch, the (R)AN initiates a switch notification to the AMF;
  • Step 311 the AMF initiates an update SM context request to the SMF, and carries the handover complete identification information;
  • Step 312 SMF interacts with PGW-U+UPF, initiates an N4 port update message, and updates the N3 user tunnel information of the 5GS session (R)AN;
  • step 313 the SMF sends an update SM context response message to the AMF, and the PDU session switching is completed.
  • SSC Modes Session and Service Continuity Mode, Session and Service Continuity Mode
  • SSC Mode1 Session and Service Continuity Mode
  • SSC Mode2 Session and Service Continuity Mode
  • SSC Mode 1 SSC Mode 1
  • the UPF that serves as the PDU session anchor when the PDU session is established will be maintained.
  • the network can trigger the release of the PDU session and instruct the UE to immediately establish a new PDU to the same data network Conversation.
  • the network allows the UE to establish a connection to the same data network through a new PDU session anchor before releasing the connection between the UE and the previous PDU session anchor.
  • the embodiments of the present application provide a method and device for supporting session and service continuity mode selection.
  • An embodiment of the present application provides a method for supporting session and service continuity mode selection, including: when a user equipment establishes a first session of a first network, a first network element obtains the session and service continuity mode supported by the user equipment The first network element obtains subscription information of the user equipment in the second network during the user equipment handover from the first network to the second network, and the subscription information includes the user The session and service continuity mode subscribed by the device; the first network element determines the user equipment according to the session and service continuity mode supported by the user equipment, the session and service continuity mode subscribed by the user equipment, and a local policy The session and service continuity mode adopted after switching to the second network.
  • the embodiment of the present application provides an apparatus for supporting session and service continuity mode selection, which is applied to a first network element, and includes: a first information acquisition module, configured to acquire all the information when the user equipment establishes the first session of the first network The session and service continuity modes supported by the user equipment; the second information acquisition module is configured to acquire the user equipment in the second network when the user equipment switches from the first network to the second network.
  • the subscription information of the network, the subscription information includes the session and service continuity mode subscribed by the user equipment; the decision module is used to determine the session and the service continuity mode that the user equipment supports according to the session and service continuity mode that the user equipment subscribes to.
  • the service continuity mode and the local policy determine the session and service continuity mode adopted by the user equipment after switching to the second network.
  • An embodiment of the present application provides an apparatus for supporting session and service continuity mode selection, including: a memory, a processor, and a session and service continuity mode selection device that is stored in the memory and can run on the processor A program for implementing the steps of the method for supporting session and service continuity mode selection when the program for supporting session and service continuity mode selection is executed by the processor.
  • An embodiment of the present application provides a computer-readable storage medium, the computer-readable storage medium stores a program that supports session and service continuity mode selection, and the program that supports session and service continuity mode selection is executed by a processor When realizing the steps of the method for supporting session and service continuity mode selection.
  • Figure 1 is an architecture diagram of a communication system supporting EPS and 5GS switching in related technologies
  • Fig. 2 is a schematic diagram of information exchange for establishing an EPS session in a communication system supporting EPS and 5GS mutual switching in related technologies;
  • Fig. 3 is a schematic diagram of information exchange of switching from an EPS session to a 5GS PDU session in a communication system supporting EPS and 5GS mutual switching in related technologies;
  • FIG. 4 is a flowchart of a method for supporting session and service continuity mode selection according to an embodiment of the application
  • FIG. 5 is a schematic diagram of an apparatus for supporting session and service continuity mode selection according to an embodiment of the application
  • FIG. 6 is a schematic diagram of information interaction of a method for supporting session and service continuity mode selection according to an embodiment of the application
  • FIG. 7 is a schematic diagram of information interaction of another method for supporting session and service continuity mode selection according to an embodiment of the application.
  • FIG. 8 is a schematic diagram of information interaction of yet another method for supporting session and service continuity mode selection according to an embodiment of the application.
  • FIG. 9 is a schematic diagram of information interaction of yet another method for supporting session and service continuity mode selection according to an embodiment of the application.
  • FIG. 10 is a schematic diagram of information interaction of another method for supporting session and service continuity mode selection according to an embodiment of the application.
  • the embodiment of the application provides a method and device for supporting session and service continuity mode selection, which can support session and service continuity mode selection in a communication system that supports two kinds of network switching, and meets various continuities of different applications/services. Claim.
  • an embodiment of the present application provides a method for supporting session and service continuity mode selection, including:
  • Step S110 When the user equipment establishes the first session of the first network, the first network element obtains the session and service continuity mode supported by the user equipment;
  • Step S120 The first network element acquires subscription information of the user equipment on the second network during the process of the user equipment handing over from the first network to the second network, where the subscription information includes the user equipment Session and service continuity mode of equipment contract;
  • Step S130 The first network element determines that the user equipment switches to the second network according to the session and service continuity mode supported by the user equipment, the session and service continuity mode subscribed by the user equipment, and the local policy. Session and service continuity mode;
  • the method further includes: the first network element initiates a session update interaction of the second network to the user equipment, and switches the user equipment to the second network during the update interaction process. 2. Notify the user equipment of the session and service continuity mode adopted after the network;
  • the first network is an evolved packet core system EPS network
  • the second network is a fifth-generation mobile communication technology system 5GS network
  • the first network element supports a packet data network gateway control plane function PGW-C on the first network, and supports a session management function SMF on the second network;
  • acquiring the session and service continuity mode supported by the user equipment includes:
  • the first network element receives, through a serving gateway SGW, a first session establishment request of a first network sent by a mobility management entity MME, where the first session establishment request carries session and service continuity mode information supported by the user equipment;
  • the MME receives an attachment request sent by the user equipment through an eNodeB, and the attachment request carries session and service continuity mode information supported by the user equipment;
  • the acquiring, by the first network element, the subscription information of the user equipment in the second network includes:
  • the second network element supports a unified data management function UDM and a home subscriber server function HSS;
  • the initiation of the session update interaction of the second network by the first network element to the user equipment includes:
  • the first network element sends the N1 session update request message of the second network to the user equipment through the access management function AMF, and the N1 session update request message carries the user equipment determined by the first network element to switch to Session and service continuity mode information adopted after the second network;
  • the user equipment after the user equipment receives the N1 session update request message, it can store the session and service continuity mode information adopted by the user equipment after switching to the second network, and the session and service continuity mode information is applied to the session in the second network. And the related processing flow of service continuity mode.
  • the user equipment may carry the session and service continuity mode supported by the user equipment in the attachment request when the EPS session is established. Choose one of them.
  • the user equipment can support all sessions and service continuity modes, and the first network element can select one of the modes supported by the user equipment.
  • the local policy may include at least one of the following:
  • DNN Data Network Name
  • the DNN may be a DNN carried when the user accesses the first network, or a DNN carried when the user accesses the second network.
  • the DNNs corresponding to the first network and the second network are the same.
  • an embodiment of the present application provides an apparatus for supporting session and service continuity mode selection, which is applied to a first network element, and includes:
  • the first information obtaining module 10 is configured to obtain the session and service continuity mode supported by the user equipment when the user equipment establishes the first session of the first network;
  • the second information acquiring module 20 is configured to acquire the subscription information of the user equipment in the second network during the process of the user equipment switching from the first network to the second network, where the subscription information includes all State the session and service continuity mode subscribed by the user equipment;
  • the decision module 30 is configured to determine the session and service continuity mode that the user equipment subscribes to after the user equipment is switched to the second network according to the session and service continuity mode supported by the user equipment, and the local policy. Service continuity model.
  • the device further includes: an update module 40;
  • the update module is configured to initiate a session update interaction of the second network to the user equipment, and notify the session and service continuity mode adopted after the user equipment is switched to the second network during the update interaction process To the user equipment.
  • the first network is an evolved packet core system EPS network
  • the second network is a fifth-generation mobile communication technology system 5GS network
  • the first network element supports a packet data network gateway control plane function PGW-C on the first network, and supports a session management function SMF on the second network.
  • the first information obtaining module is configured to obtain the session and service continuity mode supported by the user equipment when the user equipment establishes the first session of the first network in the following manner:
  • a serving gateway SGW Receiving, through a serving gateway SGW, a first session establishment request of a first network sent by a mobility management entity MME, where the first session establishment request carries session and service continuity mode information supported by the user equipment;
  • the MME receives an attachment request sent by the user equipment through an eNodeB, and the attachment request carries session and service continuity mode information supported by the user equipment.
  • the second information acquisition module is configured to acquire the subscription information of the user equipment on the second network in the following manner:
  • the second network element supports a unified data management function UDM and a home subscriber server function HSS.
  • the update module is configured to initiate a session update interaction of the second network to the user equipment in the following manner:
  • the N1 session update request message of the second network is sent to the user equipment through the access management function AMF.
  • the N1 session update request message carries the user equipment determined by the first network element after switching to the second network. Session and service continuity mode information.
  • the embodiment of the present application provides an apparatus for supporting session and service continuity mode selection, including:
  • the processor When implementing the steps of the method for supporting session and service continuity mode selection in Embodiment 1 above.
  • the embodiment of the present application provides a computer-readable storage medium, the computer-readable storage medium stores a program supporting session and service continuity mode selection, and the program supporting session and service continuity mode selection is processed by the processor When executed, the steps of the method for supporting session and service continuity mode selection in the above-mentioned embodiment 1 are realized.
  • the communication system and the UE support EPS and 5GS mutual handover.
  • the UE sends the attachment request to PGW-C+SMF with the supported SSC Mode mode.
  • the PGW-C+SMF After receiving the attachment request, the PGW-C+SMF will The SSC Mode mode is stored in the context.
  • PGW-C+SMF obtains the user session subscription data (including SSC Mode) from UDM and decides the final SSC Mode mode to be used.
  • an N1 session update message exchange is added between the AMF and the UE to carry the selected SSCMode mode to the UE.
  • a method for supporting session and service continuity mode selection may include the following steps:
  • Step 400 The UE initiates an attach request to the eNodeB, and carries the SSC Mode mode information supported by the UE;
  • Step 401 The eNodeB selects the MME, initiates an attach request to the MME, and carries the SSC Mode mode information supported by the UE;
  • Step 402 MME selects SGW and PGW-C+SMF, initiates a session establishment request to SGW, and carries SSC Mode mode information supported by UE;
  • Step 403 The SGW allocates relevant tunnel resources, establishes an EPS session, and sends a session establishment request to PGW-C+SMF, carrying the SSC Mode mode information supported by the UE;
  • Step 404 PGW-C+SMF is used as PGW-C to create EPS session related resources, and according to the handover indication carried in the indication identifier (Indication) in the session establishment request message, the pre-handover process is performed, and the relevant parameters are converted to each other; SSC mode;
  • PGW-C+SMF selects UPF and sends a PFCP session establishment request message to UPF; UPF establishes PFCP session resources, and sends a PFCP session establishment success response to PGW-C+SMF;
  • Step 405 PGW-C+SMF replies to the SGW session establishment response, carrying the resource information allocated by PGW-C and QoS Rule, AMBR, NSSAI, QoS flow descriptions and other information;
  • Step 406 The SGW replies to the MME session establishment response, which carries the resource information allocated by the SGW and PGW-C, QoS Rule, AMBR, NSSAI, QoS flow descriptions and other information;
  • Step 407 After receiving the session establishment response, the MME sends an attach acceptance response to the eNodeB;
  • Step 408 The eNodeB transparently transmits the attach acceptance response to the UE, carrying information such as QoS Rule, AMBR, NSSAI, QoS flow descriptions, and SSC mode, and the UE session establishment is completed.
  • Step 409 due to the location of the UE or the change in signal strength, the UE is required to switch to the 5GS network and initiate a switch request from EPS to 5GS;
  • step 410 the AMF initiates a request to create an SM context to the SMF, and the SMF performs resource switching conversion;
  • Step 411 SMF initiates a 5GS registration request to UDM+HSS;
  • UDM+HSS processes the registration request and responds with a successful registration response;
  • Step 412 SMF initiates a request for obtaining 5GS session subscription information to UDM+HSS;
  • UDM+HSS replies to the signing information (including SSC Mode information);
  • PGW-C+SMF combines UE capabilities, UDM subscription and local configuration strategy to select 5GS
  • Step 413 SMF interacts with PGW-U+UPF, initiates a PFCP session update message, and establishes user tunnel information for the 5GS session;
  • Step 414 The SMF sends a create SM context response message to the AMF, which carries the N3 interface tunnel information of the UPF;
  • step 415 the AMF and the (R)AN exchange the EPS session to the 5GS session and transfer the related information.
  • Step 416 the AMF initiates an update SM context request to the SMF, and carries the N3 tunnel information of the (R)AN;
  • Step 417 SMF interacts with PGW-U+UPF, initiates an N4 port update message, and updates 5GS session user tunnel information;
  • Step 418 the SMF sends an update SM context response message to the AMF, the PDU session update is successful, and the response message contains an N1 session update request message, and the N1 session update request message carries the SSC Mode information selected by the SMF;
  • Step 419 The AMF receives the N1 session update request, and sends a session update request message to the UE, carrying the SSC Mode selected by the SMF;
  • step 420 after the preparation for the handover between the UE and the (R)AN is completed, the (R)AN initiates a handover notification to the AMF.
  • Step 421 the AMF initiates an update SM context request to the SMF, and carries the handover complete identification information;
  • Step 422 SMF interacts with PGW-U+UPF, initiates an N4 port update message, and updates the N3 user tunnel information of the 5GS session (R) AN.
  • step 423 the SMF sends an update SM context response message to the AMF, and the PDU session switching is completed.
  • the communication system and the UE support EPS and 5GS mutual switching, the UE carries the SSC Mode1 mode when the EPS session is accessed, and the UDM subscription information is obtained during the switch to 5GS process to allow SSC Mode1 access. After the handover, the 5GS session finally The SSC Mode1 mode is selected.
  • the mode of SSC Mode1 is executed, the UPF anchor point remains unchanged, and the UL CL (Uplink classifier, uplink classifier) is added to shunt UPF.
  • UL CL Uplink classifier, uplink classifier
  • a method for supporting session and service continuity mode selection may include the following steps:
  • Step 500 the UE initiates EPS session establishment, and the SSC Mode mode (SSC Mode1) supported by the UE is carried in the initial attach message and the session establishment message, and PGW-C+SMF saves the information;
  • SSC Mode1 SSC Mode1 supported by the UE is carried in the initial attach message and the session establishment message, and PGW-C+SMF saves the information;
  • Step 501 Due to the location of the UE or the change in signal strength, the UE needs to switch to the 5GS network and initiate the switch from EPS to 5GS.
  • PGW-C+SMF obtains the user's contracted SSC Mode mode from UDM+HSS. SSC Mode1), the 5GS session selects the SSC Mode1 mode through the decision of the strategy, and the handover is successful;
  • step 502 due to the scenario described in the protocol such as the UE location movement or the service change or the AF (Application Function) change, the SMF decision requires UPF reselection, and the UPF change occurs during the reselection, and the new UPF2 is selected (the old UPF is UPF1);
  • Step 503 The SMF performs operations according to the SSC Mode1 mode, keeps the anchor of UPF1 unchanged, establishes UPF2 as the offload UPF of the UL CL, and establishes the N9 tunnel between UPF2 and UPF1 to implement offload.
  • both the upstream message and the downstream message will be offloaded through UPF2, and both UPF2 and UPF1 can have messages sent to the DN (Data Network).
  • DN Data Network
  • the communication system and the UE support EPS and 5GS mutual switching.
  • the UE carries the SSC Mode2 mode when the EPS session accesses.
  • the UDM subscription information is obtained during the switch to 5GS process to allow SSC Mode2 access.
  • the 5GS session finally The SSC Mode2 mode is selected.
  • the SSC Mode2 mode is executed, the existing PDU session is first released, and then a new PDU session establishment is initiated.
  • a method for supporting session and service continuity mode selection may include the following steps:
  • step 600 the UE initiates EPS session establishment, and the SSC Mode (SSC Mode2) supported by the UE is carried in the initial attach message and the session establishment message, and PGW-C+SMF saves this information;
  • SSC Mode2 SSC Mode2
  • Step 601 Due to the location of the UE or the change in signal strength, the UE needs to switch to the 5GS network and initiate the switch from EPS to 5GS.
  • PGW-C+SMF obtains the user's contracted SSC Mode mode from UDM+HSS. Allow SSC Mode2), select SSC Mode2 for 5GS sessions through policy judgment, and the switch is successful;
  • step 602 due to the scenario described in the protocol such as the UE location movement or the service change or the AF change, the SMF decision requires UPF reselection. During the reselection, a UPF change occurs, and a new UPF2 is selected.
  • Step 603 The SMF performs operations according to the SSC Mode2 mode, and informs that the existing PDU session is released first, and then a new PDU session is established, and the UE releases the existing session;
  • Step 604 The UE initiates a new PDU session establishment.
  • both the upstream message and the downstream message will pass through UPF2 to the DN.
  • the communication system and the UE support EPS and 5GS mutual switching.
  • the UE carries the SSC Mode3 mode when the EPS session accesses.
  • the UDM subscription information is obtained during the switch to 5GS process to allow SSC Mode3 access.
  • the 5GS session finally The SSC Mode3 mode is selected.
  • the SSC Mode3 mode is executed, a new PDU session establishment is initiated, and then the existing PDU session is released.
  • a method for supporting session and service continuity mode selection may include the following steps:
  • step 700 the UE initiates EPS session establishment, and the SSC Mode mode (SSC Mode3) supported by the UE is carried in the initial attach message and the session establishment message, and PGW-C+SMF saves the information;
  • SSC Mode3 SSC Mode3 supported by the UE is carried in the initial attach message and the session establishment message, and PGW-C+SMF saves the information;
  • Step 701 due to the location of the UE or the change of signal strength, the UE needs to switch to the 5GS network and initiate the switch from EPS to 5GS.
  • PGW-C+SMF obtains the user's contracted SSC Mode mode from UDM+HSS. Allow SSC Mode3), select SSC Mode3 mode for 5GS session through policy judgment, and the handover is successful;
  • step 702 due to the scenario described in the protocol such as the UE location movement or service change or AF change, the SMF decision requires a UPF reselection. During the reselection, a UPF change occurs, and a new UPF2 is selected.
  • Step 703 The SMF performs operations according to the SSC Mode3 mode, and informs that a new PDU session is established first, and then the existing PDU session is released, and the UE initiates a new PDU session establishment;
  • step 704 the UE or SMF initiates the release of the old PDU session.
  • the communication system and the UE support EPS and 5GS mutual switching.
  • the UE accesses a 5GS PDU session, it selects an SSC Mode mode (original SSC Mode mode) according to the UE's capabilities and local configuration policies, and switches to EPS first. , And then switch back to 5GS, the SSC Mode selected by the 5GS session uses the mode of the initial 5GS access.
  • the SMF reselects the UPF and a new UPF is selected, the SSC Mode selected during the session establishment can be executed correctly.
  • a method for supporting session and service continuity mode selection may include the following steps:
  • step 800 the UE initiates the establishment of a PDU session.
  • the SMF selects an SSC Mode (original SSC Mode) according to the SSC Mode supported by the UE, the subscription mode issued by UDM, and the local configuration strategy;
  • step 801 due to the location of the UE or the change in signal strength, the UE is required to switch to the EPS network and initiate a switch from 5GS to EPS, and the switch is successful;
  • step 802 due to the movement of the UE position or the change of signal strength, the UE is required to switch to the 5GS network and initiate a switch from EPS to 5GS, the selected SSC Mode mode remains unchanged, and the switch succeeds.
  • step 803 due to the scenario described in the protocol such as UE location movement or service change or AF change, the SMF decision requires UPF reselection, and a UPF change occurs during the reselection, and a new UPF2 is selected;
  • the SMF can perform operations according to the SSC Mode selected when the session is established.
  • the description in Example 2 for the SSC Mode1 mode refer to the description in Example 3 for the SSC Mode2 mode, and refer to the description in Example 4 for the SSC Mode3 mode to ensure smooth service. .
  • the first network element obtains the user equipment support when the user equipment establishes the first session of the first network.
  • the first network element acquires the subscription information of the user equipment on the second network when the user equipment is handed over from the first network to the second network, and the subscription
  • the information includes the session and service continuity mode subscribed by the user equipment; the first network element according to the session and service continuity mode supported by the user equipment, the session and service continuity mode subscribed by the user equipment, and the local policy Determine the session and service continuity mode adopted by the user equipment after switching to the second network.
  • the technical solution of the embodiment of the present application can support session and service continuity mode selection in two kinds of network switching communication systems, and meet various continuity requirements of different applications/services.
  • Such software may be distributed on a computer-readable medium, and the computer-readable medium may include a computer storage medium (or a non-transitory medium) and a communication medium (or a transitory medium).
  • the term computer storage medium includes volatile and non-volatile data implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Sexual, removable and non-removable media.
  • Computer storage media include but are not limited to RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disk (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, magnetic disk storage or other magnetic storage devices, or Any other medium used to store desired information and that can be accessed by a computer.
  • communication media usually contain computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as carrier waves or other transmission mechanisms, and may include any information delivery media. .

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Abstract

本申请实施例提供了一种支持会话和服务连续性模式选择的方法及装置。该方法包括：第一网元在用户设备建立第一网络的第一会话时，获取用户设备支持的会话和服务连续性模式；第一网元在用户设备从第一网络切换到第二网络的过程中，获取用户设备在第二网络的签约信息，该签约信息包括用户设备签约的会话和服务连续性模式；第一网元根据用户设备支持的会话和服务连续性模式，签约信息以及本地策略确定用户设备切换到第二网络后采用的会话和服务连续性模式。

Description

一种支持会话和服务连续性模式选择的方法及装置
相关申请的交叉引用
本申请基于申请号为201911066326.3、申请日为2019年11月4日的中国专利申请提出，并要求该中国专利申请的优先权，该中国专利申请的全部内容在此以引入方式并入本申请。
技术领域
本申请涉及通信技术领域，尤其涉及的是一种支持会话和服务连续性模式选择的方法及装置。
背景技术
如图1所示的通信系统架构中，EPS(Evolved Packet System，演进的分组系统)和5GS(5th-Generation System，第五代移动通信技术系统)能够互相切换。
对于EPS，UE(User Equipment，用户终端)通过E-UTRAN(Evolved UMTS Terrestrial Radio Access Network，演进的UMTS(Universal Mobile Telecommunications System，通用移动通信系统)陆地无线接入网)连接MME(Mobility Management Entity，移动管理实体)。
EPS系统包含如下网元：E-URTAN、MME、SGW(Serving Gateway，服务网关)、SMF(Session Management Function，会话管理功能)+PGW-C(PDN(Packet Data Network，分组数据网络)Gateway Control，PDN网关控制面)、UPF(User Plane Function，用户平面功能)+PGW-U(PDN(Packet Data Network，分组数据网络)Gateway User，PDN网关用户面)、HSS(Home Subscriber Server，归属签约用户服务器)+UDM(Unified Data Management，统一数据管理)。其中，HSS+UDM是HSS和UDM功能的合集，SMF+PGW-C是SMF 和PGW-C功能的合集，UPF+PGW-U是UPF和PGW-U功能的合集。EPS系统实际包含的是SMF+PGW-C中的PGW-C，UPF+PGW-U中的PGW-U，HSS+UDM中的UDM。
对于5GS，UE通过NG-RAN(NG和Radio Access Network，无线接入网络)连接AMF(Access Management Function，接入管理功能)。UE与AMF之间的接口为N1接口，NG-RAN与AMF之间的接口为N2接口，NG-RAN与UPF+PGW-U之间的接口为N3接口，SMF+PGW-C与HSS+UDM之间的接口为N10接口，SMF+PGW-C与UPF+PGW-U之间的接口为N4接口。5GS系统实际包含的是SMF+PGW-C中的SMF，UPF+PGW-U中的UPF，HSS+UDM中的HSS。
在EPS会话建立过程中，UE会在附着请求消息中携带PDU Session ID到网络侧，PDU Session ID表示UE支持5GS，也说明当前这个会话后续可能会切换到5GS，网络侧会话建立时会进行一定的预切换处理，例如：建立QoS(Quality of Service，服务质量)规则映射和QoS流描述(QoS flow descriptions)等信息。
如图2所示，EPS会话建立流程可以包括以下步骤：
步骤200，UE发起附着请求到eNodeB(Evolved Node B，演进的节点B)，携带PDU会话ID(PDU Session ID)；
步骤201，eNodeB选择MME，发起附着请求到MME，携带PDU Session ID信息；
步骤202，MME选择SGW和PGW-C+SMF，发起会话建立请求到SGW(Serving Gateway，服务网关)，携带PDU Session ID信息；
步骤203，SGW分配相关的隧道资源，建立会话，并把会话建立请求发送到PGW-C+SMF，携带PDU Session ID信息；
步骤204，PGW-C+SMF作为PGW-C创建4G(the 4th Generation mobile communication technology，第四代移动通信技术)相关资源，根据会话建立请求消息中的指示标识(Indication)中携带的切换指示，为了当前会话后面切换到5GS进行预切换处理，根据PDU Session ID和IMSI(International Mobile Subscriber Identity，国际移动用户识别码)相关信息，进行相关参数转换，并 发送策略会话建立请求到PCF；
步骤205，PCF建立策略会话相关资源，并发送会话建立成功响应到PGW-C+SMF；
步骤206，PGW-C+SMF选择UPF，发送PFCP(Packet Forwarding Control Protocol，数据包转发控制协议)会话建立请求消息到UPF；
步骤207，UPF建立PFCP会话资源，并发送PFCP会话建立成功响应到PGW-C+SMF；
步骤208，PGW-C+SMF回复SGW会话建立响应，携带PGW-C分配的资源信息和QoS Rule、AMBR(Aggregate Maximum Bit Rate，聚合最大比特速率)、NSSAI(Network Slice Selection Assistance Information，网络切片选择辅助信息)和QoS flow descriptions等信息；
步骤209，SGW回复MME会话建立响应，携带SGW和PGW-C分配的资源信息和QoS Rule、AMBR、NSSAI和QoS flow descriptions等信息；
步骤210，MME收到会话建立响应后，发送附着接受响应到eNodeB；
步骤211，eNodeB把附着接受响应透传到UE，UE会话建立完成。
在图1所示的支持EPS和5GS互切换的通信系统中，UE由EPS会话切换到5GS PDU(Protocol Data Unit，协议数据单元)会话。
如图3所示，EPS会话到5GS PDU会话的切换流程可以包括以下步骤：
步骤300，UE发起EPS会话建立，会话建立时标识支持切换；
步骤301，由于UE位置移动或者信号强弱变化，需要UE切换到5GS网络中，发起EPS到5GS的切换请求；
步骤302，AMF发起创建SM(Session Management，会话管理)上下文请求到SMF，SMF进行资源切换转换；
步骤303，SMF向UDM+HSS发起5GS注册请求；UDM+HSS处理注册请求，回复注册成功响应；
步骤304，SMF与PGW-U+UPF交互，发起N4口更新消息，建立5GS 会话的用户隧道信息；
步骤305，SMF发送创建SM上下文响应消息到AMF，携带UPF的N3口隧道信息；
步骤306，AMF与(R)AN之间进行EPS到5GS的切换请求交互，传递相关的信息；
步骤307，AMF发起更新SM上下文请求到SMF，携带(R)AN的N3口隧道信息；
步骤308，SMF与PGW-U+UPF交互，发起N4口更新消息，更新5GS会话的用户隧道信息；
步骤309，SMF发送更新SM上下文响应消息到AMF，PDU会话更新成功；
步骤310，UE和(R)AN切换准备完成之后，(R)AN发起切换通知到AMF；
步骤311，AMF发起更新SM上下文请求到SMF，携带切换完成标识信息；
步骤312，SMF与PGW-U+UPF交互，发起N4口更新消息，更新5GS会话(R)AN的N3用户隧道信息；
步骤313，SMF发送更新SM上下文响应消息到AMF，PDU会话切换完成。
在5GS系统中，为满足PDU会话的连续性需求，定义了三种SSC Mode(Session and Service Continuity Mode，会话和服务连续性模式)，分别是：SSC Mode1，SSC Mode2和SSC Mode3。
对于SSC模式1(SSC Mode1)的PDU会话，无论UE连续用来访问网络的接入技术(例如访问类型和小区)如何，都将维持在PDU会话建立时充当PDU会话锚的UPF。
对于SSC模式2(SSC Mode2)的PDU会话，如果SSC模式2(SSC Mode2)的PDU会话具有单个PDU会话锚，则网络可以触发PDU会话的释放并且指示UE立即建立到相同数据网络的新的PDU会话。
对于SSC模式3(SSC Mode3)的PDU会话，网络允许在释放UE与先前的PDU会话锚之间的连接之前，通过新的PDU会话锚建立到同一数据网络的UE连接。
上述的支持EPS和5GS互切换的通信系统目前还没有实现对SSC Mode选择进行支持，因此无法充分发挥5GS系统架构中的会话和服务连续性，无法满足UE的不同应用/服务的各种连续性要求。
发明内容
本申请实施例提供一种支持会话和服务连续性模式选择的方法及装置。
本申请实施例提供一种支持会话和服务连续性模式选择的方法，包括：第一网元在用户设备建立第一网络的第一会话时，获取所述用户设备支持的会话和服务连续性模式；所述第一网元在所述用户设备从所述第一网络切换到第二网络的过程中，获取所述用户设备在所述第二网络的签约信息，所述签约信息包括所述用户设备签约的会话和服务连续性模式；所述第一网元根据所述用户设备支持的会话和服务连续性模式，所述用户设备签约的会话和服务连续性模式以及本地策略确定所述用户设备切换到第二网络后采用的会话和服务连续性模式。
本申请实施例提供一种支持会话和服务连续性模式选择的装置，应用于第一网元，包括：第一信息获取模块，用于在用户设备建立第一网络的第一会话时，获取所述用户设备支持的会话和服务连续性模式；第二信息获取模块，用于在所述用户设备从所述第一网络切换到第二网络的过程中，获取所述用户设备在所述第二网络的签约信息，所述签约信息包括所述用户设备签约的会话和服务连续性模式；决策模块，用于根据所述用户设备支持的会话和服务连续性模式，所述用户设备签约的会话和服务连续性模式以及本地策略确定所述用户设备切换到第二网络后采用的会话和服务连续性模式。
本申请实施例提供一种支持会话和服务连续性模式选择的装置，包括：存储器、处理器及存储在所述存储器上并可在所述处理器上运行的支持会话 和服务连续性模式选择的程序，所述支持会话和服务连续性模式选择的程序被所述处理器执行时实现上述支持会话和服务连续性模式选择的方法的步骤。
本申请实施例提供一种计算机可读存储介质，所述计算机可读存储介质上存储有支持会话和服务连续性模式选择的程序，所述支持会话和服务连续性模式选择的程序被处理器执行时实现上述支持会话和服务连续性模式选择的方法的步骤。
附图说明
图1为相关技术中支持EPS和5GS互切换的通信系统的架构图；
图2为相关技术中在支持EPS和5GS互切换的通信系统中建立EPS会话的信息交互示意图；
图3为相关技术中在支持EPS和5GS互切换的通信系统中由EPS会话切换到5GS PDU会话的信息交互示意图；
图4为本申请实施例的一种支持会话和服务连续性模式选择的方法的流程图；
图5为本申请实施例的一种支持会话和服务连续性模式选择的装置的示意图；
图6为本申请实施例的一种支持会话和服务连续性模式选择的方法的信息交互示意图；
图7为本申请实施例的另一种支持会话和服务连续性模式选择的方法的信息交互示意图；
图8为本申请实施例的又一种支持会话和服务连续性模式选择的方法的信息交互示意图；
图9为本申请实施例的再一种支持会话和服务连续性模式选择的方法的信息交互示意图；
图10为本申请实施例的还一种支持会话和服务连续性模式选择的方法的信息交互示意图。
具体实施方式
为使本申请的目的、技术方案和优点更加清楚明白，下文中将结合附图对本申请的实施例进行详细说明。需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互任意组合。
在附图的流程图示出的步骤可以在诸如一组计算机可执行指令的计算机系统中执行。并且，虽然在流程图中示出了逻辑顺序，但是在某些情况下，可以以不同于此处的顺序执行所示出或描述的步骤。
本申请实施例提供一种支持会话和服务连续性模式选择的方法及装置，能够在支持两种网络切换的通信系统中支持会话和服务连续性模式选择，满足不同应用/服务的各种连续性要求。
实施例1
如图4所示，本申请实施例提供了一种支持会话和服务连续性模式选择的方法，包括：
步骤S110，第一网元在用户设备建立第一网络的第一会话时，获取所述用户设备支持的会话和服务连续性模式；
步骤S120，所述第一网元在所述用户设备从所述第一网络切换到第二网络的过程中，获取所述用户设备在第二网络的签约信息，所述签约信息包括所述用户设备签约的会话和服务连续性模式；
步骤S130，所述第一网元根据所述用户设备支持的会话和服务连续性模式，所述用户设备签约的会话和服务连续性模式以及本地策略确定所述用户设备切换到第二网络后采用的会话和服务连续性模式；
在一种实施方式中，所述方法还包括：所述第一网元向所述用户设备发起所述第二网络的会话更新交互，在所述更新交互过程中将所述用户设备切换到第二网络后采用的会话和服务连续性模式通知至所述用户设备；
在一种实施方式中，所述第一网络是演进的分组核心系统EPS网络，所述第二网络是第五代移动通信技术系统5GS网络；
所述第一网元在所述第一网络支持分组数据网络网关控制面功能PGW-C，并且在所述第二网络支持会话管理功能SMF；
在一种实施方式中，所述第一网元在用户设备建立第一网络的第一会话时，获取所述用户设备支持的会话和服务连续性模式，包括：
所述第一网元通过服务网关SGW接收移动管理实体MME发送的第一网络的第一会话建立请求，所述第一会话建立请求中携带所述用户设备支持的会话和服务连续性模式信息；
其中，所述MME通过eNodeB接收所述用户设备发送的附着请求，所述附着请求中携带所述用户设备支持的会话和服务连续性模式信息；
在一种实施方式中，所述第一网元获取用户设备在第二网络的签约信息，包括：
所述第一网元向第二网元发送获取用户设备在第二网络的签约信息的请求；
所述第一网元接收所述第二网元回复的用户设备在第二网络的签约信息；
其中，所述第二网元支持统一数据管理功能UDM和归属签约用户服务器功能HSS；
在一种实施方式中，所述第一网元向所述用户设备发起所述第二网络的会话更新交互，包括：
所述第一网元通过接入管理功能AMF向所述用户设备发送第二网络的N1会话更新请求消息，所述N1会话更新请求消息中携带所述第一网元确定出的用户设备切换到第二网络后采用的会话和服务连续性模式信息；
其中，用户设备接收到N1会话更新请求消息后，可以存储用户设备切换到第二网络后采用的会话和服务连续性模式信息，所述会话和服务连续性模式信息应用于第二网络中涉及会话和服务连续性模式的相关处理流程。
其中，第一网元确定用户设备切换到第二网络后采用的会话和服务连续 性模式时，可以从用户设备在EPS会话建立时携带在附着请求中的用户设备支持的会话和服务连续性模式中选择一种。比如，用户设备可以支持所有的会话和服务连续性模式，第一网元可以从用户设备支持的模式中选择一种。
在一种实施方式中，所述本地策略可以包括以下至少一种：
参考SMF本地部署号段支持的会话和服务连续性模式进行用户设备在第二网络时的会话和服务连续性模式选择；
参考用户设备接入时携带的数据网络名称(Data Network Name，简称DNN)支持的会话和服务连续性模式进行用户设备在第二网络时的会话和服务连续性模式选择；
其中，所述DNN可以是用户在接入第一网络时携带的DNN，也可是用户在接入第二网络时携带的DNN，一般来说，第一网络和第二网络对应的DNN相同。
实施例2
如图5所示，本申请实施例提供了一种支持会话和服务连续性模式选择的装置，应用于第一网元，包括：
第一信息获取模块10，用于在用户设备建立第一网络的第一会话时，获取所述用户设备支持的会话和服务连续性模式；
第二信息获取模块20，用于在所述用户设备从所述第一网络切换到第二网络的过程中，获取所述用户设备在所述第二网络的签约信息，所述签约信息包括所述用户设备签约的会话和服务连续性模式；
决策模块30，用于根据所述用户设备支持的会话和服务连续性模式，所述用户设备签约的会话和服务连续性模式以及本地策略确定所述用户设备切换到第二网络后采用的会话和服务连续性模式。
在一种实施方式中，所述装置还包括：更新模块40；
所述更新模块，用于向所述用户设备发起所述第二网络的会话更新交互，在所述更新交互过程中将所述用户设备切换到第二网络后采用的会话和服务 连续性模式通知至所述用户设备。
在一种实施方式中，所述第一网络是演进的分组核心系统EPS网络，所述第二网络是第五代移动通信技术系统5GS网络；
所述第一网元在所述第一网络支持分组数据网络网关控制面功能PGW-C，并且在所述第二网络支持会话管理功能SMF。
在一种实施方式中，所述第一信息获取模块，用于采用以下方式在用户设备建立第一网络的第一会话时，获取所述用户设备支持的会话和服务连续性模式：
通过服务网关SGW接收移动管理实体MME发送的第一网络的第一会话建立请求，所述第一会话建立请求中携带所述用户设备支持的会话和服务连续性模式信息；
其中，所述MME通过eNodeB接收所述用户设备发送的附着请求，所述附着请求中携带所述用户设备支持的会话和服务连续性模式信息。
在一种实施方式中，所述第二信息获取模块，用于采用以下方式获取用户设备在第二网络的签约信息：
向第二网元发送获取用户设备在第二网络的签约信息的请求；
接收所述第二网元回复的用户设备在第二网络的签约信息；
其中，所述第二网元支持统一数据管理功能UDM和归属签约用户服务器功能HSS。
在一种实施方式中，所述更新模块，用于采用以下方式向所述用户设备发起所述第二网络的会话更新交互：
通过接入管理功能AMF向所述用户设备发送第二网络的N1会话更新请求消息，所述N1会话更新请求消息中携带所述第一网元确定出的用户设备切换到第二网络后采用的会话和服务连续性模式信息。
实施例3
本申请实施例提供了一种支持会话和服务连续性模式选择的装置，包括：
存储器、处理器及存储在所述存储器上并可在所述处理器上运行的支持会话和服务连续性模式选择的程序，所述支持会话和服务连续性模式选择的程序被所述处理器执行时实现上述实施例1中的支持会话和服务连续性模式选择的方法的步骤。
实施例4
本申请实施例提供了一种计算机可读存储介质，所述计算机可读存储介质上存储有支持会话和服务连续性模式选择的程序，所述支持会话和服务连续性模式选择的程序被处理器执行时实现上述实施例1中的支持会话和服务连续性模式选择的方法的步骤。
示例1
本示例中，通信系统和UE支持EPS和5GS互切换，UE在向PGW-C+SMF发送的附着请求中携带所支持的SSC Mode模式，PGW-C+SMF收到所述附着请求后，将SSC Mode模式存储到上下文中。当UE发起EPS向5GS切换过程中，PGW-C+SMF从UDM获取该用户会话签约数据(含SSC Mode)并决策最终使用的SSC Mode模式。在切换准备阶段，AMF与UE之间增加N1会话更新消息交互以携带选择的SSCMode模式给UE。
如图6所示，一种支持会话和服务连续性模式选择的方法可以包括以下步骤：
步骤400，UE发起附着请求到eNodeB，携带UE支持的SSC Mode模式信息；
步骤401，eNodeB选择MME，发起附着请求到MME，携带UE支持的SSC Mode模式信息；
步骤402，MME选择SGW和PGW-C+SMF，发起会话建立请求到SGW，携带UE支持的SSC Mode模式信息；
步骤403，SGW分配相关的隧道资源，建立EPS会话，并把会话建立请 求发送到PGW-C+SMF，携带UE支持的SSC Mode模式信息；
步骤404，PGW-C+SMF作为PGW-C创建EPS会话相关资源，根据会话建立请求消息中的指示标识(Indication)中携带的切换指示，进行预切换处理，相关参数互相转换；存储UE支持的SSC mode模式；
PGW-C+SMF选择UPF，发送PFCP会话建立请求消息到UPF；UPF建立PFCP会话资源，并发送PFCP会话建立成功响应到PGW-C+SMF；
步骤405，PGW-C+SMF回复SGW会话建立响应，携带PGW-C分配的资源信息和QoS Rule、AMBR、NSSAI、QoS flow descriptions等信息；
步骤406，SGW回复MME会话建立响应，携带SGW和PGW-C分配的资源信息和QoS Rule、AMBR、NSSAI、QoS flow descriptions等信息；
步骤407，MME收到会话建立响应后，发送附着接受响应到eNodeB；
步骤408，eNodeB把附着接受响应透传到UE，携带QoS Rule、AMBR、NSSAI、QoS flow descriptions和SSC mode等信息，UE会话建立完成。
步骤409，由于UE位置移动或者信号强弱变化，需要UE切换到5GS网络中，发起EPS到5GS的切换请求；
步骤410，AMF发起创建SM上下文请求到SMF，SMF进行资源切换转换；
步骤411，SMF向UDM+HSS发起5GS注册请求；UDM+HSS处理注册请求，回复注册成功响应；
步骤412，SMF向UDM+HSS发起获取5GS会话签约信息请求；
UDM+HSS回复签约信息(含SSC Mode信息)；
PGW-C+SMF结合UE的能力、UDM签约以及本地配置策略选择5GS
会话选择的SSC Mode；
步骤413，SMF与PGW-U+UPF交互，发起PFCP会话更新消息，建立5GS会话的用户隧道信息；
步骤414，SMF发送创建SM上下文响应消息到AMF，携带UPF的N3口隧道信息；
步骤415，AMF与(R)AN之间进行EPS会话到5GS会话的切换请求交互，传递相关的信息。
步骤416，AMF发起更新SM上下文请求到SMF，携带(R)AN的N3口隧道信息；
步骤417，SMF与PGW-U+UPF交互，发起N4口更新消息，更新5GS会话用户隧道信息；
步骤418，SMF发送更新SM上下文响应消息到AMF，PDU会话更新成功，响应消息中包含N1会话更新请求消息，所述N1会话更新请求消息携带SMF选择的SSC Mode信息；
步骤419，AMF收到N1会话更新请求，发送会话更新请求消息给UE，携带SMF选择的SSC Mode；
步骤420，UE和(R)AN切换准备完成之后，(R)AN发起切换通知到AMF。
步骤421，AMF发起更新SM上下文请求到SMF，携带切换完成标识信息；
步骤422，SMF与PGW-U+UPF交互，发起N4口更新消息，更新5GS会话(R)AN的N3用户隧道信息。
步骤423，SMF发送更新SM上下文响应消息到AMF，PDU会话切换完成。
示例2
本示例中，通信系统和UE支持EPS和5GS互切换，UE在EPS会话接入时携带了SSC Mode1的模式，切换到5GS过程中获取UDM签约信息允许SSC Mode1接入，切换后的5GS会话最终选择了SSC Mode1模式。当SMF发生UPF重选，选择了新的UPF之后，执行SSC Mode1的模式，UPF锚点不变，新增UL CL(Uplink classifier，上行分类器)分流UPF。
如图7所示，一种支持会话和服务连续性模式选择的方法可以包括以下步骤：
步骤500，UE发起EPS会话建立，在初始附着消息里和会话建立消息里携带UE支持的SSC Mode模式(SSC Mode1)，PGW-C+SMF保存该信息；
步骤501，由于UE位置移动或者信号强弱变化，需要UE切换到5GS网络中，发起EPS到5GS的切换，在切换过程中PGW-C+SMF从UDM+HSS获取该用户的签约SSC Mode模式(SSC Mode1)，通过策略判断决策5GS会话选择SSC Mode1模式，切换成功；
步骤502，由于UE位置移动或者业务变化或者AF(Application Function应用功能)变化等协议描述的场景，SMF决策需要进行UPF重选，重选时发生UPF变化，选择了新的UPF2(旧的UPF是UPF1)；
步骤503，SMF根据SSC Mode1模式执行操作，保持UPF1锚点不变化，建立UPF2作为UL CL的分流UPF，建立UPF2和UPF1之间的N9隧道，实现分流。
最终上行报文和下行报文都会经过UPF2进行分流，UPF2和UPF1都可以有报文到DN(Data Network，数据网络)。
示例3
本示例中，通信系统和UE支持EPS和5GS互切换，UE在EPS会话接入时携带了SSC Mode2的模式，切换到5GS过程中获取UDM签约信息允许SSC Mode2接入，切换后的5GS会话最终选择了SSC Mode2模式。当SMF发生UPF重选，选择了新的UPF之后，执行SSC Mode2的模式，先释放现有的PDU会话，然后发起新的PDU会话建立。
如图8所示，一种支持会话和服务连续性模式选择的方法可以包括以下步骤：
步骤600，UE发起EPS会话建立，在初始附着消息里和会话建立消息里携带UE支持的SSC Mode模式(SSC Mode2)，PGW-C+SMF保存该信息；
步骤601，由于UE位置移动或者信号强弱变化，需要UE切换到5GS网络中，发起EPS到5GS的切换，在切换过程中PGW-C+SMF从UDM+HSS获取该用户的签约SSC Mode模式(允许SSC Mode2)，通过策略判断决策 5GS会话选择SSC Mode2模式，切换成功；
步骤602，由于UE位置移动或者业务变化或者AF变化等协议描述的场景，SMF决策需要进行UPF重选，重选时发生UPF变化，选择了新的UPF2。
步骤603，SMF根据SSC Mode2模式执行操作，通知先释放现有的PDU会话，然后建立新的PDU会话，UE释放现有会话；
步骤604，UE发起新的PDU会话建立。
最终上行报文和下行报文都会经过UPF2到DN。
示例4
本示例中，通信系统和UE支持EPS和5GS互切换，UE在EPS会话接入时携带了SSC Mode3的模式，切换到5GS过程中获取UDM签约信息允许SSC Mode3接入，切换后的5GS会话最终选择了SSC Mode3模式。当SMF发生UPF重选，选择了新的UPF之后，执行SSC Mode3的模式，先发起新的PDU会话建立，然后释放现有的PDU会话。
如图9所示，一种支持会话和服务连续性模式选择的方法可以包括以下步骤：
步骤700，UE发起EPS会话建立，在初始附着消息里和会话建立消息里携带UE支持的SSC Mode模式(SSC Mode3)，PGW-C+SMF保存该信息；
步骤701，由于UE位置移动或者信号强弱变化，需要UE切换到5GS网络中，发起EPS到5GS的切换，在切换过程中PGW-C+SMF从UDM+HSS获取该用户的签约SSC Mode模式(允许SSC Mode3)，通过策略判断决策5GS会话选择SSC Mode3模式，切换成功；
步骤702，由于UE位置移动或者业务变化或者AF变化等协议描述的场景，SMF决策需要进行UPF重选，重选时发生UPF变化，选择了新的UPF2。
步骤703，SMF根据SSC Mode3模式执行操作，通知先建立新的PDU会话，再释放现有的PDU会话，UE发起新的PDU会话建立；
此时，上行报文和下行报文都会经过UPF2到DN。
步骤704，UE或SMF发起旧的PDU会话释放。
示例5
本示例中，通信系统和UE支持EPS和5GS互切换，UE在5GS PDU会话接入时根据UE的能力和本地配置策略选择了一种SSC Mode的模式(原始SSC Mode模式)，先切换到EPS，然后再切换回5GS后，5GS会话选择的SSC Mode模式使用初始5GS接入的模式，当SMF发生UPF重选，选择了新的UPF之后，能够正确执行会话建立时选择的SSC Mode模式。
如图10所示，一种支持会话和服务连续性模式选择的方法可以包括以下步骤：
步骤800，UE发起PDU会话建立，会话建立时SMF根据UE支持的SSC Mode模式和UDM下发的签约模式，以及本地配置策略，选择了一种SSC Mode模式(原始SSC Mode模式)；
步骤801，由于UE位置移动或者信号强弱变化，需要UE切换到EPS网络中，发起5GS到EPS的切换，切换成功；
步骤802，由于UE位置移动或者信号强弱变化，需要UE切换到5GS网络中，发起EPS到5GS的切换，选择的SSC Mode模式不变，切换成功。
步骤803，由于UE位置移动或者业务变化或者AF变化等协议描述的场景，SMF决策需要进行UPF重选，重选时发生UPF变化，选择了新的UPF2；
步骤804，SMF能够根据会话建立时选择的SSC Mode模式执行操作，SSC Mode1模式参考示例2中的描述，SSC Mode2模式参考示例3中的描述，SSC Mode3模式参考示例4中的描述，保证业务畅通。
与相关技术相比，本申请实施例提供的一种支持会话和服务连续性模式选择的方法及装置，第一网元在用户设备建立第一网络的第一会话时，获取所述用户设备支持的会话和服务连续性模式，所述第一网元在所述用户设备从所述第一网络切换到第二网络的过程中，获取所述用户设备在第二网络的签约信息，所述签约信息包括所述用户设备签约的会话和服务连续性模式； 所述第一网元根据所述用户设备支持的会话和服务连续性模式，所述用户设备签约的会话和服务连续性模式以及本地策略确定所述用户设备切换到第二网络后采用的会话和服务连续性模式。本申请实施例的技术方案能够在两种网络切换的通信系统中支持会话和服务连续性模式选择，满足不同应用/服务的各种连续性要求。
本领域普通技术人员可以理解，上文中所公开方法中的全部或某些步骤、系统、装置中的功能模块/单元可以被实施为软件、固件、硬件及其适当的组合。在硬件实施方式中，在以上描述中提及的功能模块/单元之间的划分不一定对应于物理组件的划分；例如，一个物理组件可以具有多个功能，或者一个功能或步骤可以由若干物理组件合作执行。某些物理组件或所有物理组件可以被实施为由处理器，如中央处理器、数字信号处理器或微处理器执行的软件，或者被实施为硬件，或者被实施为集成电路，如专用集成电路。这样的软件可以分布在计算机可读介质上，计算机可读介质可以包括计算机存储介质(或非暂时性介质)和通信介质(或暂时性介质)。如本领域普通技术人员公知的，术语计算机存储介质包括在用于存储信息(诸如计算机可读指令、数据结构、程序模块或其他数据)的任何方法或技术中实施的易失性和非易失性、可移除和不可移除介质。计算机存储介质包括但不限于RAM、ROM、EEPROM、闪存或其他存储器技术、CD-ROM、数字多功能盘(DVD)或其他光盘存储、磁盒、磁带、磁盘存储或其他磁存储装置、或者可以用于存储期望的信息并且可以被计算机访问的任何其他的介质。此外，本领域普通技术人员公知的是，通信介质通常包含计算机可读指令、数据结构、程序模块或者诸如载波或其他传输机制之类的调制数据信号中的其他数据，并且可包括任何信息递送介质。
需要说明的是，本申请还可有其他多种实施例，在不背离本申请精神及其实质的情况下，熟悉本领域的技术人员可根据本申请作出各种相应的改变和变形，但这些相应的改变和变形都应属于本申请所附的权利要求的保护范围。

Claims (10)

  1. 一种支持会话和服务连续性模式选择的方法，包括：
    第一网元在用户设备建立第一网络的第一会话时，获取所述用户设备支持的会话和服务连续性模式；
    所述第一网元在所述用户设备从所述第一网络切换到第二网络的过程中，获取所述用户设备在所述第二网络的签约信息，所述签约信息包括所述用户设备签约的会话和服务连续性模式；
    所述第一网元根据所述用户设备支持的会话和服务连续性模式，所述用户设备签约的会话和服务连续性模式以及本地策略确定所述用户设备切换到第二网络后采用的会话和服务连续性模式。
  2. 如权利要求1所述的方法，其中，所述方法还包括：
    所述第一网元向所述用户设备发起所述第二网络的会话更新交互，在所述更新交互过程中将所述用户设备切换到第二网络后采用的会话和服务连续性模式通知至所述用户设备。
  3. 如权利要求1或2所述的方法，其中：
    所述第一网络是演进的分组系统EPS网络，所述第二网络是第五代移动通信技术系统5GS网络；
    所述第一网元在所述第一网络支持分组数据网络网关控制面功能PGW-C，并且在所述第二网络支持会话管理功能SMF。
  4. 如权利要求3所述的方法，其中：
    所述第一网元在用户设备建立第一网络的第一会话时，获取所述用户设备支持的会话和服务连续性模式，包括：
    所述第一网元通过服务网关SGW接收移动管理实体MME发送的第一网络的第一会话建立请求，所述第一会话建立请求中携带所述用户设备支持的会话和服务连续性模式信息；
    其中，所述MME通过eNodeB接收所述用户设备发送的附着请求，所述 附着请求中携带所述用户设备支持的会话和服务连续性模式信息。
  5. 如权利要求3所述的方法，其中：
    所述第一网元获取用户设备在第二网络的签约信息，包括：
    所述第一网元向第二网元发送获取用户设备在第二网络的签约信息的请求；
    所述第一网元接收所述第二网元回复的用户设备在第二网络的签约信息；
    其中，所述第二网元支持统一数据管理功能UDM和归属签约用户服务器功能HSS。
  6. 如权利要求3所述的方法，其中：
    所述第一网元向所述用户设备发起所述第二网络的会话更新交互，包括：
    所述第一网元通过接入管理功能AMF向所述用户设备发送第二网络的N1会话更新请求消息，所述N1会话更新请求消息中携带所述第一网元确定出的用户设备切换到第二网络后采用的会话和服务连续性模式信息。
  7. 如权利要求1所述的方法，其中：
    所述本地策略包括：参考会话管理功能SMF本地部署号段支持的会话和服务连续性模式进行用户设备在第二网络时的会话和服务连续性模式选择。
  8. 一种支持会话和服务连续性模式选择的装置，应用于第一网元，包括：
    第一信息获取模块，用于在用户设备建立第一网络的第一会话时，获取所述用户设备支持的会话和服务连续性模式；
    第二信息获取模块，用于在所述用户设备从所述第一网络切换到第二网络的过程中，获取所述用户设备在所述第二网络的签约信息，所述签约信息包括所述用户设备签约的会话和服务连续性模式；
    决策模块，用于根据所述用户设备支持的会话和服务连续性模式，所述用户设备签约的会话和服务连续性模式以及本地策略确定所述用户设备切换到第二网络后采用的会话和服务连续性模式。
  9. 一种支持会话和服务连续性模式选择的装置，包括：存储器、处理器及存储在所述存储器上并可在所述处理器上运行的支持会话和服务连续性模式选择的程序，所述支持会话和服务连续性模式选择的程序被所述处理器执行时实现上述权利要求1-7中任一项所述的支持会话和服务连续性模式选择的处理方法的步骤。
  10. 一种计算机可读存储介质，所述计算机可读存储介质上存储有支持会话和服务连续性模式选择的程序，所述支持会话和服务连续性模式选择的程序被处理器执行时实现上述权利要求1-7中任一项所述的支持会话和服务连续性模式选择的方法的步骤。
PCT/CN2020/126571 2019-11-04 2020-11-04 一种支持会话和服务连续性模式选择的方法及装置 WO2021088894A1 (zh)

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