WO2021008313A1 - 实现业务连续的方法、相关装置及系统 - Google Patents

实现业务连续的方法、相关装置及系统 Download PDF

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Publication number
WO2021008313A1
WO2021008313A1 PCT/CN2020/097539 CN2020097539W WO2021008313A1 WO 2021008313 A1 WO2021008313 A1 WO 2021008313A1 CN 2020097539 W CN2020097539 W CN 2020097539W WO 2021008313 A1 WO2021008313 A1 WO 2021008313A1
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WIPO (PCT)
Prior art keywords
gateway
user equipment
user
node device
network
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Application number
PCT/CN2020/097539
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English (en)
French (fr)
Inventor
陶振宇
姜传奎
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.)
Filing date
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 JP2022502968A priority Critical patent/JP7310006B2/ja
Priority to KR1020227004083A priority patent/KR102711270B1/ko
Priority to BR112022000729A priority patent/BR112022000729A2/pt
Priority to EP20841548.9A priority patent/EP3996423A4/en
Publication of WO2021008313A1 publication Critical patent/WO2021008313A1/zh
Priority to US17/577,543 priority patent/US20220141747A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/16—Gateway arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/22—Performing reselection for specific purposes for handling the traffic
    • 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
    • H04W36/0022—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
    • H04W36/00222—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies between different packet switched [PS] network technologies, e.g. transferring data sessions between LTE and WLAN or LTE and 5G
    • 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
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/00835—Determination of neighbour cell lists
    • H04W36/008355—Determination of target cell based on user equipment [UE] properties, e.g. UE service capabilities
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Definitions

  • This application relates to the field of communication technology, and in particular to a method, related device and system for realizing business continuity.
  • the coverage of the second generation (2nd Generation, 2G) network or the third generation (3rd Generation, 3G) network (referred to as the 2/3G network) and the fourth generation (4th Generation, 4G) network Both have wider coverage than the 5th Generation (5G) network. Therefore, when the user equipment is moving, it may access from the 2/3G network, then move to the 4G network, and then move to the 5G network. Or, the user directly moves to the 5G network after accessing the 2/3G network.
  • the prior art provides a method for user equipment to move between the 5G network and 4G network to achieve business continuity.
  • the user equipment accesses the 2/3G network and then moves from the 2/3G network to the 5G network, the UE needs to Reconnecting to the 5G network caused the interruption of the services used by users under the 2/3 network, and the continuity of services could not be maintained.
  • the embodiment of the present application provides a method for realizing service continuity, which can solve the service interruption problem caused by the user equipment moving from the 2/3G network to the 5G network in the prior art.
  • an embodiment of the present application provides a method for realizing business continuity, which is applied to a service node device in a communication network.
  • the main steps include:
  • the service node device determines that the user equipment has 5G capability or the user corresponding to the user equipment is a 5G user, and then the service node device selects a 5G gateway for the user equipment and establishes a connection with the 5G Conversations between gateways. Therefore, when subsequent user equipment moves to the 5G network, the same 5G gateway provides services to the user equipment, and the user's address can remain unchanged when moving from the 2/3G network to the 5G network, thereby realizing the user's business continuity.
  • the serving node device may determine that the user corresponding to the user equipment is a 5G user in the following manner:
  • the service node device receives an attachment request sent by a user equipment, and the attachment request carries a user identifier; wherein the attachment requesting user requests to attach to the 2/3G network. Subsequently, the service node device obtains the subscription data of the user corresponding to the user equipment from the user data server according to the user identification, and determines that the user corresponding to the user equipment is a 5G user according to the obtained subscription data.
  • the service node device may determine that the user equipment has 5G capability and the user is a 5G user, and then the service node device selects a 5G gateway for the user equipment.
  • the serving node device receives an attachment request sent by the user equipment, and the attachment request carries the 5G capability of the user equipment. Therefore, the serving node device can determine that the user equipment has 5G capability according to the received attachment request.
  • establishing a session between the serving node device and the 5G gateway includes:
  • the serving node device sends a packet data protocol (packet data protocol, PDP) session creation request to the 5G gateway, and receives a PDP session creation response message returned by the 5G gateway.
  • a packet data protocol packet data protocol, PDP
  • the PDP session response message received by the serving node device carries the 2/3G network parameters of the user equipment, and the serving node device further sends the 2/3G network parameters to the user equipment to facilitate The UE uses a 2/3G network.
  • the mobile management device after receiving the tracking area update request sent by the user equipment, the mobile management device obtains the 5G network parameters of the user equipment from the 5G gateway, and then the mobile management device updates the tracking area through the 5G gateway. In response to sending the 5G network parameters to the user equipment, it is convenient for the user equipment to use after moving to the 5G network.
  • the tracking area update request received by the mobility management device also carries a correspondence between a packet data unit (PDU) session identifier and an evolved packet system (evolved packet system, EPS) bearer identifier;
  • PDU packet data unit
  • EPS evolved packet system
  • the mobile management device sends the corresponding relationship between the PDU session identifier and the EPS bearer identifier to the 5G gateway through a session creation request message.
  • the 5G gateway may receive the session creation request message and save the PDU session identifier and EPS bearer identifier carried therein. The corresponding relationship.
  • the mobility management device receives the create session response message returned by the 5G gateway, which carries the 5G network parameters.
  • the mobile management device may send the 5G network parameters to the user equipment through a tracking area update response, so that the user equipment can use it after moving to the 5G network.
  • the 5G gateway can find the PDU session of the user equipment using the correspondence between the PDU session identifier and the EPS bearer identifier, and apply 5G network parameters to the PDU session.
  • the serving node device receives the bearer allocation request sent by the user equipment, and then obtains the 5G network parameters of the user equipment from the 5G gateway. After acquiring the 5G network parameters, the serving node device sends the 5G network parameters to the user equipment through a bearer allocation response.
  • the bearer allocation response may be a bearer modification request message.
  • the bearer allocation request sent by the user equipment also carries the correspondence between the packet data unit PDU session identifier and the evolved packet system EPS bearer identifier
  • the mobility management device sends a bearer resource request to the 5G gateway
  • the mobility management device receives the bearer resource response sent by the 5G gateway, which carries the 5G network parameters.
  • the mobile management device sends 5G network parameters to the user equipment through a bearer modification request message.
  • the mobile management device receives the 5G network parameters of the user sent by the 5G gateway, and then the mobile management device sends the 5G network parameters to the user equipment.
  • the mobility management device receives the bearer modification request sent by the user equipment, which carries the correspondence between the PDU session identifier of the packet data unit and the EPS bearer identifier of the evolved packet system, and then the mobility management device sends the request to the 5G gateway Sending the corresponding relationship between the PDU session identifier and the EPS bearer identifier, so that the 5G gateway saves the corresponding relationship between the PDU session identifier and the EPS bearer identifier.
  • the serving node device receives an activation context request message sent by the user equipment, and the activation context request message carries a protocol data unit PDU session identifier.
  • establishing a session between the serving node device and the 5G gateway includes:
  • the serving node device receives the PDP context creation response message sent by the 5G gateway.
  • the PDP context creation response message received by the serving node device also carries the 5G network parameters allocated to the user equipment, and then the serving node device sends an activation context response message to the user equipment, and
  • the activation context response message carries the 5G network parameters.
  • selecting a 5G gateway for the user equipment by the serving node device includes:
  • the service node device generates or obtains the fully qualified domain name FQDN of the 5G gateway from the domain name system, and then uses the FQDN to obtain the address of the 5G gateway from the domain name system.
  • the serving node device obtains the user's 5G network parameters from the 5G gateway, and then the serving node device sends the 5G network parameters to the user equipment.
  • the embodiments of the present application provide a method for realizing business continuity, which mainly includes:
  • the 5G gateway receives a session creation request sent by the mobility management device or the service node device, and the session creation request carries the indication information that the user equipment has 5G capability or the user signs up for 5G services, and then the 5G gateway is the user corresponding to the user equipment or is The user allocates 5G network parameters, and sends the allocated 5G network parameters to the mobility management device or the service node device.
  • the mobility management device or the service node device can forward 5G network parameters to the user equipment, and the user equipment can save these 5G network parameters and use them after moving to the 5G network to achieve business continuity.
  • the 5G gateway may receive a session creation request sent by the mobile management device when the user equipment accesses the 4G network.
  • the 5G gateway can receive the session creation request sent by the service node device when the user equipment accesses the 2/3G network. Therefore, the 5G gateway can allocate 5G parameters to the user equipment before the user equipment accesses the 5G network, so that the user equipment directly uses these 5G network parameters after accessing the 5G network to achieve business continuity.
  • the 5G gateway sends the allocated 5G network parameters to the mobility management device through a create session response message or an update bearer request message.
  • the 5G gateway sends the allocated 5G network parameters to the service node device through a create session response message.
  • the 5G gateway receives the correspondence between the packet data unit PDU session identifier and the bearer identifier sent by the mobility management device or the service node device, and then the 5G gateway determines the corresponding relationship of the user equipment according to the correspondence PDU session, and apply the 5G network parameters to the PDU session.
  • the bearer identifier includes an evolved packet system EPS bearer identifier or a PDP context identifier.
  • the 5G gateway allocates 2/3G network parameters and 4G network parameters corresponding to the 5G network parameters to the user, so that the 5G gateway transmits to the mobility management device or the service node device.
  • the 2/3G network parameters and the 4G network parameters are also sent to the mobility management device or the service node device, so that the user equipment can enjoy similar services in 2/3G, 4G, and 5G.
  • the embodiments of the present application provide a method for realizing business continuity, which mainly includes:
  • the PDP context activation request message is sent to the serving node device to activate the PDP context, and the PDP context activation request message carries the indication information that the user equipment has 5G capability. Subsequently, the user equipment receives an activation PDP context response message sent by the serving node device, and the activation PDP context request message carries 5G network parameters.
  • an embodiment of the present application provides a method for realizing business continuity, which mainly includes:
  • the user equipment sends a tracking area update request message to the mobile management device to update the tracking area, the tracking area update request message carries the indication information that the user equipment has 5G capability, and then the user equipment receives the tracking sent by the mobile management device An area update response message, where the tracking area update response message carries 5G network parameters.
  • the tracking area update response message also carries 2/3G network parameters and 4G network parameters corresponding to the 5G network parameters.
  • the embodiments of the present application provide a method for realizing business continuity, which mainly includes:
  • the user equipment sends a bearer resource allocation request message to the mobility management device to request the allocation of bearer resources, the bearer resource allocation request message carries the indication information that the user equipment has 5G capability, and then the user equipment receives the bearer sent by the mobility management device A resource allocation response message, where the bearer resource allocation response message carries 5G network parameters.
  • the bearer resource allocation response message further carries 2/3G network parameters and 4G network parameters corresponding to the 5G network parameters.
  • the embodiments of the present application provide a method for realizing business continuity, which mainly includes:
  • the user equipment sends a PDP context activation request to the mobile management device, and the PDP context activation request carries the indication information that the user equipment has 5G capability, and then the user equipment receives the activation PDP context response sent by the mobile management device, the activation
  • the PDP context response carries 5G network parameters.
  • the activation PDP context response message received by the user equipment also carries 2/3G network parameters and 4G network parameters corresponding to the 5G network parameters.
  • an embodiment of the present application provides a method for realizing business continuity, which mainly includes:
  • the user equipment receives a bearer context modification request message sent by the mobility management device, where the bearer context modification request message carries 5G network parameters; then, the user equipment saves the 5G network parameters.
  • the user equipment sends a modified bearer context accept message to the mobility management entity, where the modified bearer context accept message carries the correspondence between the PDU session identifier and the EPS bearer identifier.
  • the user equipment can save the 5G network parameters, and when subsequently moving to the 5G network, directly use the 5G network parameters to maintain business continuity.
  • the indication information that the user equipment has 5G capability is the identifier of the PDU session, the correspondence between the identifier of the PDU session and the EPS bearer identifier, and the identifier of the PDU session At least one of the corresponding relationships with the PDP context identifier.
  • the 5G network parameters are used to perform data services.
  • the 5G network parameters include service quality and service flow template.
  • an embodiment of the present application provides a method for realizing business continuity, which mainly includes:
  • the user equipment sends a PDU session establishment request to the AMF to establish a PDU session;
  • the user equipment receives a PDU session establishment complete message sent by the AMF, and the PDU session establishment complete message carries 5G network parameters and 2/3G network parameters and 4G network parameters corresponding to the 5G network parameters.
  • the user equipment can save the 2/3G network parameters and the 4G network parameters, and then directly use the 2/3G network parameters and 4G network parameters when moving to the 2/3G network or 4G network, without obtaining them from the core network equipment These parameters further improve business continuity.
  • an embodiment of the present application provides a service node device, which includes:
  • the non-volatile memory and the processor are coupled to each other, and the processor calls the program code stored in the memory to make the service node device execute the method as described in the first aspect.
  • an embodiment of the present application provides a 5G gateway, which includes:
  • a non-volatile memory and a processor are coupled to each other, and the processor calls the program code stored in the memory to make the 5G gateway execute the method as described in the second aspect.
  • an embodiment of the present application provides a service node device, which mainly includes:
  • a determining module configured to determine that the user equipment has 5G capability or the user corresponding to the user equipment is a 5G user when the user equipment is attached to the 2/3G network;
  • the selection module is used to select a 5G gateway for the user equipment
  • the session establishment module is used to establish a session with the 5G gateway.
  • the service node device provided in this embodiment can be used in the method for realizing business continuity provided in the first aspect.
  • the business continuity of the user equipment is realized through the cooperation between the determining module, the selecting module, and the session establishing module, which solves the problem in the prior art.
  • determining module in the service node device determines that the user corresponding to the user equipment is a 5G user specifically includes:
  • the serving node device further includes a receiving module configured to receive an attachment request sent by the user equipment, where the attachment request carries the 5G capability of the user equipment. At this time, the receiving module also determines that the user equipment has 5G capability according to the received attachment request.
  • the session establishment module of the service node device establishing a session with the 5G gateway includes:
  • the service node device further includes:
  • An obtaining module configured to obtain 5G network parameters of the user equipment from the 5G gateway after receiving the bearer allocation request sent by the user equipment;
  • the sending module is configured to send the 5G network parameters to the user equipment through a bearer allocation response. Therefore, the user equipment can receive the bearer allocation response and save the 5G network parameters carried in it, so that these 5G parameters can be used directly after moving to the 5G network.
  • the receiving module in the service node device is further configured to receive an activation context request message sent by the user equipment, where the activation context request message carries a protocol data unit PDU session identifier;
  • Establishing a session with the 5G gateway by the session establishment module in the service node device includes: sending a PDP context creation request message to the 5G gateway to request the creation of a PDP context for the user equipment.
  • the request message carries the PDU session identifier; the PDP context creation response message sent by the 5G gateway is received, thereby creating a session between the serving node device and the 5G gateway.
  • the create PDP context response carries 5G network parameters allocated for the user equipment.
  • the sending module in the service node device is further configured to send an activation context response message to the user equipment, where the activation context response message carries the 5G network parameters.
  • the selection module in the service node device provided in this application selects the 5G gateway for the user equipment including: generating a fully qualified domain name FQDN of the 5G gateway or submitting a fully qualified domain name to the domain name system or the 5G gateway FQDN, using the FQDN to request the domain name system address resolution to obtain the address of the 5G gateway.
  • an embodiment of the present application provides a 5G gateway, which mainly includes a receiving module, a parameter allocation module, and a sending module.
  • the receiving module is configured to receive a session creation request sent by a mobile management device or a service node device, and the session creation request carries indication information that the user equipment has 5G capability or the user signs up for 5G services;
  • the parameter allocation module is configured to allocate 5G network parameters to the user corresponding to the user equipment or the user;
  • the sending module is configured to send the allocated 5G network parameters to the mobility management device or the service node device.
  • the 5G gateway device provided in this embodiment can be used in the method for realizing business continuity provided in the previous embodiment.
  • the business continuity of the user equipment is realized through cooperation between the receiving module, the parameter allocation module, and the sending module, which solves the problem of The service interruption caused by user equipment moving from 2/3G network to 5G network.
  • the sending module in the 5G gateway may specifically send the allocated 5G network parameters to the mobility management device through a create session response message or an update bearer request message.
  • the sending module can also send the assigned 5G network parameters to the service node device by creating a session response message, so that the service node device or mobility management device can forward the 5G network parameters to the user equipment, so that the user equipment can move to the 5G network. use.
  • the receiving module in the 5G gateway is further configured to receive the correspondence between the packet data unit PDU session identifier and the bearer identifier sent by the mobility management device or the serving node device.
  • the 5G gateway further includes a parameter application module 903, configured to determine the PDU session corresponding to the user equipment according to the corresponding relationship, and then apply the 5G network parameter to the PDU session.
  • the parameter allocation module in the 5G gateway is further configured to allocate 2/3G network parameters and 4G network parameters corresponding to the 5G network parameters to the user.
  • the sending module in the 5G gateway is further configured to send the 2/3G network parameters and the 4G network parameters to the mobility management device or the service node device.
  • the user equipment can save 2/3G network parameters, 4G network parameters, and 5G network parameters, which is convenient for subsequent use.
  • an embodiment of the present application provides a communication system, which is characterized in that it includes:
  • a service node device and a 5G gateway, the service node device is configured in:
  • the user equipment When the user equipment is attached to the 2/3G network, it is determined that the user equipment has 5G capability or the user corresponding to the user equipment is a 5G user;
  • the service node device selects a 5G gateway for the user equipment, and establishes a session with the 5G gateway;
  • the 5G gateway is configured to establish a session with the service node device.
  • the 5G gateway of the aforementioned communication system is further configured to receive a session creation request sent by a mobility management device or a service node device, and the session creation request carries that the user equipment has 5G capability or the user is The instruction information of the 5G user allocates 5G network parameters to the user, and sends the allocated 5G network parameters to the mobility management device or the service node device.
  • the aforementioned communication system may further include a mobility management device configured to receive the user's 5G network parameters sent by the 5G gateway, and then send the 5G network parameters to the user equipment .
  • the serving node device and the mobility management device may also be configured to perform the method described in the first aspect above, and the 5G gateway may be configured to perform the method described in the second aspect above.
  • the serving node device and the mobility management device may also be configured to perform the method described in the first aspect above
  • the 5G gateway may be configured to perform the method described in the second aspect above.
  • the communication system may also include user equipment, user data server, and so on.
  • an embodiment of the present application provides a computer-readable storage medium, the computer-readable storage medium stores program code, wherein the program code includes any one of the first aspect to the eighth aspect. Instructions for some or all of the steps of a method.
  • the embodiments of the present application provide a computer program product, which when the computer program product runs on a computer, causes the computer to execute part or all of the steps of any one of the first to eighth aspects .
  • the user identification may be the user's globally unique temporary identification, international mobile subscriber identification code, mobile station international ISDN number, IP multimedia private identification, IP multimedia public identification or international mobile equipment identification code .
  • the 5G gateway is a device that integrates a 2/3G gateway, a 4G gateway, and a 5G gateway.
  • the 5G gateway is a session management function device.
  • the serving node device is a serving general packet radio service support node device
  • the mobility management device is a mobility management entity
  • Fig. 1 is a schematic diagram of a communication system provided by an embodiment of the application
  • Figure 2 is a flowchart of a method for realizing business continuity provided by an embodiment of the present application
  • FIG. 3 is a flowchart of another method for realizing business continuity provided by an embodiment of the present application.
  • Figure 4 is a flowchart of another method for realizing business continuity provided by an embodiment of the present application.
  • Fig. 5 is a flowchart of another method for realizing business continuity provided by an embodiment of the present application.
  • Fig. 6 is a flowchart of another method for realizing business continuity provided by an embodiment of the present application.
  • FIG. 7 is a schematic diagram of a service node device, a 5G gateway, and a mobility management device provided by an embodiment of the application;
  • FIG. 8 is a schematic diagram of user equipment provided by an embodiment of the present application.
  • FIG. 9 is a schematic diagram of a service node device provided by an embodiment of the present application.
  • FIG. 10 is a schematic diagram of a 5G gateway provided by an embodiment of the present application.
  • FIG. 11 is a schematic diagram of user equipment provided by an embodiment of the present application.
  • Fig. 1 is a schematic diagram of a communication system provided by an embodiment of the application.
  • the communication system provided in the embodiment of the present application includes 2/3G access network equipment, 4G access network equipment, 5G access network equipment, and core network equipment.
  • the access network equipment may include a base station and so on.
  • the equipment of the core network may include user data servers, service node equipment, 5G gateways and mobile management equipment.
  • the 2/3G access network is connected to the core network through service node equipment, the 4G access network is connected to the core network through mobile management equipment, and the 5G access network can be connected to the core network through mobile management equipment or through a 5G gateway. network. Therefore, user equipment (UE) can access the core network through 2/3G access network equipment, access the core network through 4G access network equipment, or access the core network through 5G access network equipment.
  • UE user equipment
  • 2G networks can include global system for mobile communication (GSM) networks, code division multiple access (CDMA) networks, and 3G networks can include wideband code division multiple access (wideband code division) networks.
  • 4G network includes long term evolution (LTE) LTE network.
  • 5G networks include new radio (NR) networks and so on.
  • the 2/3G access network in this embodiment is referred to as 2/3G network
  • 4G access network is referred to as 4G network
  • 5G access network is referred to as 5G network.
  • the serving node device may specifically be a serving general packet radio service support node (serving general packet radio service support node, SGSN), which is mainly used for mobility management of UEs in 2G and 3G networks.
  • the gateway general packet radio service support node (Gateway General Packet Radio Service Support Node, GGSN) is mainly used for session management and UE data forwarding in 2G and 3G networks.
  • SGSN can be deployed independently, or combined with GGSN and deployed together.
  • the mobility management device may also be referred to as a mobility management entity (MME), which is mainly responsible for the positioning and paging process of UEs in idle mode in the 4G network.
  • MME mobility management entity
  • the 5G gateway includes a session management function (session management function, SMF) device, which can implement session management for UEs accessing the 5G network.
  • SMF session management function
  • the 5G gateway may also be a converged gateway (abbreviated as converged 5G gateway) that integrates the respective functions of GGSN, serving gateway (SGW), packet data network gateway (PGW) and SMF. If the control plane and the user plane are deployed separately, the 5G gateway in this embodiment may be a device that integrates the control plane functions of SMF and GGSN, the control plane functions of SGW, and the control plane functions of PGW.
  • converged 5G gateway abbreviated as converged 5G gateway
  • GGSN serving gateway
  • PGW packet data network gateway
  • PGW packet data network gateway
  • the user data server can store the user's subscription data, which can be a combination of unified data management (UDM) equipment, home subscriber server (HSS) and home location register (HLR). Functional equipment, or equipment with independent functions of UDM, HSS, and HLR.
  • UDM unified data management
  • HSS home subscriber server
  • HLR home location register
  • the UE supports access to 2/3G, 4G and 5G networks and can move freely in 2/3G, 4G, and 5G networks.
  • the UE supporting the 5G access network first accesses through the 2/3G access network, the UE initiates an attachment request to the 2/3G network, and the SGSN determines the user after receiving the attachment request from the UE Whether the device has 5G capability or whether the user corresponding to the UE has subscribed to 5G services. If the user equipment has 5G capability or the user subscribes to 5G services, the SGSN selects a 5G gateway for the user equipment, and then establishes a session with the 5G gateway. Compared with the prior art, when the UE in this embodiment attaches to a 2/3G network, it can select a 5G gateway, and the 5G gateway can provide services for the UE.
  • the 5G gateway will still provide services, so that the user’s data services (such as video calls, online videos, etc.) under the 2/3G network can continue to be maintained under the 5G network. Improve the user's business experience.
  • FIG. 2 is a flowchart of a method for realizing business continuity provided by an embodiment of the present application.
  • Step 201 The 5G user equipment accesses the 2/3G network and sends an attachment request to the 2/3G network.
  • a UE supporting 2/3G, 4G, and 5G access is first connected to the 2/3G network, for example, the user is in an elevator or garage.
  • the UE accesses 2/3G, it sends an attach (attach) request to the 2/3G network device.
  • the attachment request is forwarded to the SGSN through the 2/3G wireless access network.
  • the attach request can carry the user identity and the 5G capability of the UE.
  • the attachment request may also carry the location information of the UE.
  • the 5G capability of the UE may be carried by the UE Network Capability or MS Network Capability parameter in the attach request.
  • the value of this parameter is N1 mode support, which indicates that the UE has 5G capabilities, that is, the UE supports access to the 5G network.
  • Step 202 The SGSN initiates a location update to the user data server.
  • the SGSN After receiving the attachment request from the UE, the SGSN initiates a location update to the user data server.
  • the SGSN may send a location update request message to the user data server, which carries the user identification.
  • the user identifier may be a globally unique temporary identifier (GUTI), an international mobile user identification number, an international ISDN number of a mobile station, or an international mobile equipment identification number, etc.
  • GUI globally unique temporary identifier
  • the user data server records the location of the UE, obtains the user's subscription data according to the user ID, and then sends an update location response message to the SGSN, and the response message carries the user's subscription data.
  • the 5G subscription information carried in the subscription data is specifically: allowing access to the 5G core network (Core Network Restriction parameter) and allowing the bearer to switch to 5G (Interworking 5GS Indicator parameter).
  • Step 203 The SGSN sends an attach accept message to the UE.
  • the SGSN may send an attach accept (attach accept) message to the UE.
  • Step 204 The UE sends a request to activate the packet data protocol PDP context to the SGSN.
  • the packet data protocol PDP context (context) request is used to request the SGSN to activate the PDP context of the UE.
  • Step 205 The SGSN determines that the user corresponding to the UE is a 5G user.
  • the subscription data carries information that the user has subscribed to the 5G service, so the SGSN can determine that the user corresponding to the UE is a 5G user. If the subscription data does not carry information about the 5G service, that is, the UE does not subscribe to the 5G service, the MME determines that the user is a non-5G user and executes the normal PDP context activation process.
  • Step 206 The SGSN selects a 5G gateway for the user equipment.
  • the SGSN can generate the FQDN of the 5G gateway based on the routing area identity (RAI) fully qualified domain name (FQDN), and then use the FQDN of the 5G gateway to send the FQDN to the domain name system (domain name system). , DNS) query to obtain the address of the 5G gateway.
  • RAI routing area identity
  • FQDN fully qualified domain name
  • DNS domain name system
  • the SGSN can also directly use the RAI FQDN to query DNS to obtain the DNS resolution result of the gateway, select the domain name corresponding to the 5G gateway based on the resolution result, and then query the DNS using the domain name corresponding to the 5G gateway to obtain the address of the 5G gateway.
  • the analysis results returned by DNS distinguish between 5G gateways and non-5G gateways.
  • the analysis result of the 5G gateway carries the capability identifier of "nc-smf".
  • the 5G gateway may be an SMF device, or a device that integrates the control plane functions of SMF and GGSN, the control plane functions of SGW, and the control plane functions of PGW.
  • the 5G gateway can also be a converged gateway that integrates the respective functions of GGSN, SGW, PGW and SMF.
  • the SGSN may also select a 5G gateway for the UE when it determines that the user corresponding to the UE is a 5G user and the user equipment has 5G capabilities.
  • Step 207 The SGSN establishes a session with the 5G gateway.
  • the step of establishing a session between the SGSN and the 5G gateway specifically includes the SGSN sending a PDP session creation request to the 5G gateway, and the 5G gateway returning a PDP session creation response to the SGSN.
  • the response can carry the UE's 2/3G network parameters, such as quality of service QoS , IP address, etc.
  • Step 208 After the establishment of the session with the 5G gateway is completed, the SGSN returns an activation PDP context acceptance message to the UE.
  • the Activate PDP Context Accept message returned by the SGSN to the UE may carry the parameters of the UE in the 2/3G network, such as quality of service QoS, IP address, etc.
  • the UE After the UE receives the Activate PDP Context Accept message, it completes the PDP context activation process, and the UE can use the parameters in the 2/3G network to perform data services.
  • the UE can continue to communicate with the previously selected 5G gateway after moving to the 5G network, and the address of the UE remains unchanged, so that the service will not be interrupted.
  • Step 209 The UE sends a tracking area update request to the mobility management entity MME, and executes the tracking area update process.
  • the UE moves from 2/3G to a 4G network and initiates a tracking area update (tracking area update, TAU) process.
  • the tracking area update request carries parameters such as the identification of the tracking area where the UE is located and the 5G capability of the UE.
  • the tracking area update request may also carry the correspondence between the PDU session identifier (ID) and the EPS bearer identifier of the evolved packet system.
  • ID PDU session identifier
  • EPS bearer ID the correspondence between the PDU session identifier ID and the EPS bearer ID can be carried in a variety of ways. For example, it can be directly carried in the TAU request using protocol configuration options (PCO) cells, or it can be encapsulated in the ESM requested by the TAU.
  • PCO protocol configuration options
  • the Container cell is sent to the mobile management entity.
  • the UE After the UE finishes updating the tracking area, it can continue to use data services in the 4G network.
  • Step 210 The MME sends a session creation request to the 5G gateway to create a session with the 5G gateway.
  • the session creation request sent by the MME carries indication information indicating that the user equipment has 5G capability or the user has subscribed to 5G services, so as to instruct the 5G gateway to allocate 5G network parameters (or 5G parameters for short) to the user corresponding to the user equipment.
  • the Interworking 5GS Indicator parameter carried in the session creation request indicates that the user has subscribed to the 5G service.
  • the UE Network Capability parameter is carried in the session creation request and the value is N1 mode support, it indicates that the user equipment has 5G capability.
  • the session creation request may also carry the corresponding relationship between the PDU session identifier and the EPS bearer identifier.
  • the 5G gateway may save the above-mentioned indication information and the corresponding relationship between the PDU session identifier and the EPS bearer identifier.
  • the aforementioned session creation request can be passed to the 5G gateway through the SGW.
  • Step 211 The 5G gateway allocates 5G network parameters to the user.
  • the 5G gateway after receiving the session creation request sent by the MME, the 5G gateway allocates 5G network parameters to the user according to the instruction information carried therein. For example, parameters such as 5G QoS rules (rule), QoS flow description (flow description), and service flow template (traffic flow template, TFT) are allocated to users to facilitate the UE to use after moving to the 5G network.
  • 5G QoS rules rule
  • QoS flow description flow description
  • service flow template traffic flow template
  • Step 212 The 5G gateway sends 5G network parameters to the MME through a session creation response.
  • Step 213 The MME sends the 5G network parameters to the UE through a tracking area update accept message.
  • the MME can carry the above 5G network parameters through the PCO cell in the TAU accept message.
  • the MME sends a tracking area update accept message to indicate the end of the tracking area update process.
  • the UE After the UE completes the TAU process, it can continue to use the data service provided by the 4G network in the tracking area.
  • the UE After receiving the TUA acceptance message, the UE saves the 5G network parameters carried in it. Subsequently, the UE moves from the 4G network to the 5G network, and the UE can continue to communicate with the 5G gateway. Since the corresponding relationship between the PDU session identifier and the EPS bearer identifier is stored in the 5G gateway, the 5G gateway can directly find the PDU session used by the UE in the 5G network, and apply the assigned 5G network parameters to the PDU session.
  • the parameters of the 5G network are sent to the UE in advance in this embodiment, after the UE accesses the 5G network, it directly uses the previously saved 5G network parameters to continue the data service, and does not need to obtain the 5G network parameters from the 5G gateway again. Improve business continuity.
  • FIG. 3 is a flowchart of another method provided by an embodiment of the present application.
  • Step 301 The 5G user equipment accesses the 2/3G network and sends an attachment request to the 2/3G network.
  • Step 302 The SGSN initiates a location update to the user data server.
  • Step 303 The SGSN sends an attach accept message to the UE.
  • Step 304 The UE sends a PDP context activation request to the SGSN.
  • Step 305 The SGSN determines that the user corresponding to the UE is a 5G user.
  • Step 306 The SGSN selects a 5G gateway for the user equipment.
  • Step 307 The SGSN establishes a session with the 5G gateway.
  • Step 308 After the establishment of the session with the 5G gateway is completed, the SGSN returns an activate PDP context acceptance message to the UE.
  • Step 309 The UE sends a tracking area update request to the mobility management entity MME, and executes the tracking area update process.
  • Step 310 The MME sends a session creation request to the 5G gateway to create a session with the 5G gateway.
  • the session creation request may carry indication information that the user equipment has 5G capability or the user has subscribed to 5G services, so as to instruct the 5G gateway to allocate 5G network parameters to the user.
  • the Interworking 5GS Indicator parameter carried in the session creation request indicates that the user has subscribed to the 5G service.
  • the session creation request carries the UE Network Capability parameter, and the value is N1 mode support, to indicate that the user equipment has 5G capability.
  • the session creation request may also carry the corresponding relationship between the PDU session identifier and the EPS bearer identifier.
  • the functions of SMF, PGW, and SGW are integrated in the 5G gateway.
  • the SGW in the 5G gateway receives the session creation request sent by the MME, and sends the indication information to the SMF through the modify bearer request.
  • the SMF locally saves the indication information and replies to the modify bearer response modify bearer response. To SGW.
  • Step 311 The 5G gateway determines that 5G network parameters need to be allocated to the user.
  • the SMF in the 5G gateway determines that 5G network parameters need to be allocated to the user according to the instruction information.
  • the SMF in the 5G gateway may determine that 5G network parameters need to be allocated to the user according to the indication information in the session creation request. If the session creation request sent by the MME does not carry the indication information, the 5G gateway does not need to allocate 5G network parameters to the user.
  • Step 312 The 5G gateway sends a session creation response to the MME.
  • the SGW in the 5G gateway after receiving the bearer modification response from the SMF, returns a session creation response to the MME, indicating that the session creation between the MME and the SGW is completed. Since the 5G gateway integrates the functions of the SGW, after the SGW returns a session creation response, it can also be considered that the session creation between the MME and the 5G gateway is completed.
  • Step 313 The MME sends a TUA accept message to the UE to complete the TAU process.
  • the UE After the UE completes the TAU process, it can continue to use the data service provided by the 4G network in the tracking area.
  • Step 314 The UE sends a bearer resource allocation request to the MME, requesting the MME to allocate bearer resources.
  • the bearer resource allocation request sent by the UE may carry the correspondence between the PDU session ID and the EPS bearer ID.
  • the corresponding relationship between the PDU session identifier ID and the EPS bearer ID can be carried in a variety of ways, for example, it can be carried directly in the bearer resource allocation request using the PCO cell.
  • Step 315 The MME sends a bearer resource command message to the 5G gateway, which carries the correspondence between the PDU session ID and the EPS bearer ID.
  • the MME receives the bearer resource allocation request forwarded by the radio access network device, and then sends a bearer resource command message to the 5G gateway, which carries the correspondence between the PDU session ID and the EPS bearer ID.
  • Step 316 The 5G gateway allocates 5G network parameters to the user.
  • the 5G gateway since the 5G gateway determines in step 311 that 5G network parameters need to be allocated to the user, the 5G gateway allocates 5G network parameters to the user after receiving the bearer resource command message.
  • the 5G gateway allocates parameters such as 5G QoS rule, QoS flow description, and service flow template to users, so that the UE can use it after moving to the 5G network.
  • Step 317 The 5G gateway sends 5G network parameters to the MME through an update bearer request.
  • Step 318 The MME sends the 5G network parameters to the UE through a bearer modification request.
  • the above-mentioned bearer modification request carrying 5G network parameters is forwarded to the UE through the radio access network device.
  • the UE After receiving the bearer modification request, the UE completes the allocation of bearer resources. At the same time, the UE saves these 5G network parameters.
  • the UE may also return a bearer modification response to the MME.
  • the UE moves from the 4G network to the 5G network, and the UE can continue to communicate with the 5G gateway.
  • the 5G gateway also saves the corresponding relationship between the above PDU session identifier and EPS bearer identifier, so the 5G gateway can determine the PDU session ID used by the UE in the 5G network according to the EPS bearer ID of the UE in the 4G network and the above corresponding relationship, and look up Go to the corresponding PDU session and apply the assigned 5G network parameters to the PDU session.
  • the parameters of the 5G network are sent to the UE in advance in this embodiment, after the UE accesses the 5G network, it directly uses the previously saved 5G network parameters to continue the data service, and does not need to obtain the 5G network parameters from the 5G gateway again. Improve business continuity.
  • the session creation request sent by the MME to the 5G gateway in step 310 may not carry the indication information of the UE's 5G capability, the indication information of the user signing up for the 5G service, the PDU session identifier and the EPS bearer identifier. Correspondence.
  • the SGW in the 5G gateway After receiving the session creation request, the SGW in the 5G gateway returns a session creation response to the MME, indicating that the session creation between the MME and the SGW is completed.
  • the 5G gateway receives the bearer resource command message sent by the MME (step 315), since it carries the PDU session identifier, the 5G gateway can determine that it needs to allocate 5G network parameters to the user.
  • the 5G gateway After allocating 5G network parameters to the user, the 5G gateway sends the 5G network parameters to the MME through an update bearer request.
  • the 5G gateway may determine in advance (in step 311) that 5G network parameters need to be allocated to the user, or it may determine the need to allocate 5G network parameters to the user after step 315.
  • FIG. 4 is a flowchart of another method provided by an embodiment of the present application.
  • Step 401 The 5G user equipment accesses the 2/3G network and sends an attachment request to the 2/3G network.
  • Step 402 The SGSN initiates a location update to the user data server.
  • Step 403 The SGSN sends an attach accept message to the UE.
  • Step 404 The UE sends a PDP context activation request to the SGSN.
  • Step 405 The SGSN determines that the user corresponding to the UE is a 5G user.
  • Step 406 The SGSN selects a 5G gateway for the user equipment.
  • Step 407 The SGSN establishes a session with the 5G gateway.
  • Step 408 After the establishment of the session with the 5G gateway is completed, the SGSN returns an activate PDP context acceptance message to the UE.
  • Step 409 The UE sends a tracking area update request to the mobility management entity MME, and executes the tracking area update process.
  • Step 410 The MME sends a session creation request to the 5G gateway to create a session with the 5G gateway.
  • Step 411 The 5G gateway determines that 5G network parameters need to be allocated to the user.
  • Step 412 The 5G gateway sends a session creation response to the MME.
  • Step 413 The MME sends a TUA accept message to the UE to complete the TAU process.
  • steps 401-413 is the same as steps 301-313 in the above embodiment.
  • steps 301-313 the execution process of steps 401-413 is the same as steps 301-313 in the above embodiment.
  • steps 401-413 please refer to the above embodiment, which will not be repeated here.
  • Step 414 The 5G gateway allocates 5G network parameters to the user.
  • the 5G gateway since the 5G gateway determines in step 411 that 5G network parameters need to be allocated to the user, the 5G gateway actively allocates 5G network parameters to the user.
  • the 5G gateway allocates parameters such as 5G QoS rule, QoS flow description, and service flow template to users, so that the UE can use it after moving to the 5G network.
  • Step 415 The 5G gateway sends a bearer update request to the MME, which carries the allocated 5G network parameters.
  • Step 416 The MME forwards the 5G network parameters to the UE through the EPS bearer modification request message.
  • the UE receives the EPS bearer modification request message sent by the MME, and saves the 5G network parameters carried therein.
  • Step 417 The UE returns an EPS bearer modification response message to the MME, which carries the correspondence between the PDU session ID and the EPS bearer ID.
  • Step 418 The MME sends an update bearer response to the 5G gateway, which carries the correspondence between the PDU session ID and the EPS bearer ID.
  • the 5G gateway After receiving the update bearer response, the 5G gateway saves the corresponding relationship between the PDU session ID and the EPS bearer ID carried therein.
  • the UE moves from the 4G network to the 5G network, and the UE can continue to communicate with the 5G gateway.
  • the 5G gateway also saves the corresponding relationship between the PDU session identifier and the EPS bearer identifier, so that the 5G gateway can find the PDU session used by the UE in the 5G network according to the corresponding relationship, and apply the assigned 5G network parameters to the PDU session.
  • the 5G gateway may not need to wait for the UE to initiate a bearer resource allocation request, and actively trigger the process of updating the bearer, thereby sending the 5G network parameters to the UE.
  • the efficiency is further improved, and the service continuity of the UE is guaranteed.
  • FIG. 5 is a flowchart of another method provided by an embodiment of the present application.
  • Step 501 The 5G user equipment accesses the 2/3G network and sends an attachment request to the 2/3G network.
  • Step 502 The SGSN initiates a location update to the user data server.
  • Step 503 The SGSN sends an attach accept message to the UE.
  • steps 501-503 is the same as the steps 201-203 in the foregoing embodiment.
  • steps 501-503 is the same as the steps 201-203 in the foregoing embodiment.
  • Step 504 The UE sends a PDP context activation request to the SGSN.
  • the PDP context request carries the correspondence between the PDU session identifier and the PDP context identifier.
  • Step 505 The SGSN determines that the user corresponding to the UE is a 5G user or the UE has 5G capability.
  • the SGSN can determine that the UE has 5G capability according to the corresponding relationship between the PDU session identifier and the PDP context identifier, and further needs to select a 5G gateway for the user equipment.
  • the 5G gateway may also determine that the user has subscribed to the 5G service (that is, the user is a 5G user) according to the subscription information obtained during the location update, and then the 5G gateway needs to be selected for the user equipment.
  • the SGSN may also determine that the user equipment has 5G capabilities and the user has subscribed to 5G services before performing the step of selecting a 5G gateway for the user equipment.
  • Step 506 The SGSN selects a 5G gateway for the user equipment.
  • step 506 is the same as that of step 206 in the foregoing embodiment. For details, refer to the foregoing embodiment, which will not be repeated here.
  • Step 507 The SGSN establishes a session with the 5G gateway.
  • the step of establishing a session between the SGSN and the 5G gateway specifically includes the MME sending a PDP session creation request to the 5G gateway, and the PDP session request carries the corresponding relationship between the PDU session identifier and the PDP context identifier.
  • the request may also carry the 5G subscription information obtained by the SGSN from the UDM, for example, the Interworking 5GS Indicator parameter, indicating that the user has subscribed to the 5G service.
  • the GGSN in the 5G gateway can receive the PDP session creation request, and forward the corresponding relationship between the PDU session identifier and the PDP context identifier, 5G subscription information, etc., to the SMF, so that the SMF performs the subsequent process of assigning 5G parameters to the user .
  • the 5G gateway may save the correspondence between the PDU session identifier and the PDP context identifier.
  • Step 508 The 5G gateway determines that 5G network parameters need to be allocated to the user.
  • the 5G gateway may determine that the UE has 5G capability according to the correspondence between the PDU session identifier and the PDP context identifier, and further needs to allocate 5G network parameters to the user.
  • the 5G gateway can also determine that the user has subscribed to the 5G service according to the 5G subscription information carried in the PDP session creation request, and then needs to allocate 5G network parameters to the user.
  • Step 509 The 5G gateway allocates 5G network parameters to the user.
  • the 5G gateway can allocate parameters such as 5G QoS rule, QoS flow description, and service flow template for users, so that the UE can use it after moving to the 5G network.
  • Step 510 The 5G gateway sends 5G network parameters to the SGSN through a session creation response.
  • the 5G gateway returns a PDP session creation response to the SGSN.
  • the response can carry the parameters of the UE in the 2/3G network, such as quality of service QoS, IP address, etc.
  • the response to create a PDP session also carries the 5G network parameters allocated by the 5G gateway to the user.
  • Step 511 The SGSN sends an activation PDP context accept message to the UE, which carries the above 5G network parameters.
  • the SGSN can return the 5G network parameters allocated by the 5G gateway to the UE by activating the PDP context accept message.
  • the 2/3G network parameters are also carried in the Activate PDP Context Accept message.
  • the UE receives the Activate PDP Context Accept message sent by the MME, and saves the 2/3G network parameters and 5G network parameters carried therein.
  • the UE can initiate data services on the 2/3G network. Subsequently, the UE moves from the 2/3G network to the 5G network (the movement process may or may not pass through the 4G network), and the UE can continue to communicate with the 5G gateway.
  • the 5G gateway also saves the correspondence between the aforementioned PDU session identifier and the PDP context identifier, so that the 5G gateway can directly find the PDU session used by the UE in the 5G network, and apply the assigned 5G network parameters to the PDU session to maintain business continuity .
  • FIG. 6 is a flowchart of another method provided by an embodiment of the present application.
  • Step 601 The 5G user equipment accesses the 5G network and registers with the 5G core network.
  • the registration process includes authenticating the user and assigning a user identity, such as assigning a globally unique temporary identity.
  • the UE initiates the process of establishing a PDU session.
  • the equipment participating in the registration process includes UE, access management function (AMF) equipment, user data server, etc.
  • AMF access management function
  • Step 602 The UE sends a PDU session establishment request to the AMF device to request the establishment of a PDU session.
  • Step 603 The AMF sends a session management SM context request message to the 5G gateway.
  • the AMF after receiving the PDU session establishment request sent by the UE, the AMF sends a session management (session management, SM) context request (CreateSMContext Request) to the 5G gateway through the servicing interface to request the establishment of a PDU session .
  • session management session management, SM
  • ReateSMContext Request session management context request
  • the 5G gateway may be a session management function (SMF) device, or a converged gateway that integrates the respective functions of GGSN, SGW, PGW, and SMF.
  • the 5G gateway in this embodiment may also be a device that integrates the control plane functions of SMF and GGSN, the control plane functions of SGW, and the control plane functions of PGW.
  • Step 604 The 5G gateway obtains user subscription information from the user data server.
  • Step 605 The 5G gateway allocates 5G network parameters, 2/3G and 4G parameters corresponding to the 5G network parameters to the user.
  • the user subscribes to a 5G service.
  • the SMF allocates 5G network parameters to the user, such as 5G QoS rule, QoS flow description, service flow template and other parameters.
  • the 5G gateway also converts these 5G network parameters into corresponding 2/3G and 4G network parameters.
  • Step 606 The 5G gateway returns 5G network parameters, 2/3G and 4G parameters corresponding to the 5G network parameters to the AMF.
  • the 5G gateway can send the 2/3G, 4G, and 5G network parameters allocated to the user to the AMF through the N1N2message transfer message.
  • Step 607 The AMF sends a PDU session establishment acceptance message to the UE, which carries 2/3G, 4G and 5G network parameters.
  • the UE After the UE receives the above PDU session establishment acceptance message, it saves the 2/3G, 4G and 5G network parameters carried therein, and the UE directly uses the 5G network parameters for data services.
  • the UE moves from the 5G network to the 2/3G or 4G network, it does not need to obtain network parameters from the core network equipment (such as SGSN, MME, etc.), communicate directly with the converged 5G gateway, and use the pre-saved 2/3G network Parameters and 4G network parameters are used for data services to maintain business continuity.
  • the core network equipment such as SGSN, MME, etc.
  • FIG. 7 is a schematic diagram of a service node device, a 5G gateway, and a mobility management device provided by an embodiment of the present application.
  • the service node device, 5G gateway, and mobility management device provided in this embodiment all use general computer hardware, including a processor 701, a memory 702, a bus 703, an input device 704, an output device 705, and so on.
  • the memory 702 may include a computer storage medium in the form of a volatile and/or nonvolatile memory, such as a read-only memory and/or a random access memory.
  • the memory 702 can store an operating system, application programs, other program modules, executable code, program data, user account opening data, user subscription data, and the like.
  • the input device 704 can be used to input commands and information to the service node device.
  • the input device 704 is a keyboard or pointing device, such as a mouse, trackball, touchpad, microphone, joystick, game pad, satellite TV antenna, scanner or similar devices . These input devices may be connected to the processor 701 via the bus 703.
  • the output device 705 can be used to output information from the service node device. In addition to the display, the output device 705 can also provide other peripheral output devices, such as speakers and/or printing devices. These output devices can also be connected to the processor 701 through the bus 703 .
  • the service node device may be connected to the network through the network interface 706, for example, connected to a local area network (LAN).
  • LAN local area network
  • the computer-executed instructions stored in the service node device can be stored in a remote storage device, not limited to local storage.
  • the service node device can execute the method steps on the service node device side in the above embodiments, for example, execute steps 203-204, 206 , 303-304, 307, etc.
  • the specific execution process refer to the above-mentioned embodiment, which will not be repeated here.
  • the mobile management device can execute the steps of the method on the mobile management device side in the above embodiments, for example, execute steps 210, 213, 310, 312 , 416, 418, etc.
  • steps 210, 213, 310, 312 , 416, 418, etc. For the specific execution process, refer to the above-mentioned embodiment, which will not be repeated here.
  • the 5G gateway can execute the method steps on the 5G gateway side in the above embodiments, for example, execute steps 207, 307, 311-312, 411 -412, 508-509, 605-606, etc.
  • FIG. 8 is a schematic diagram of a user equipment provided by an embodiment of the present application.
  • the user equipment mainly includes a processor 801, a memory 802, a bus 803, an input device 804, an output device 805, and a network interface 806.
  • the user equipment may also include components such as an application processor (AP) and a battery.
  • AP application processor
  • the memory 802 may include a computer storage medium in the form of a volatile and/or nonvolatile memory, such as a read-only memory and/or a random access memory.
  • the memory 802 can store an operating system, application programs, other program modules, executable codes, and program data.
  • the input device 804 can be used to input commands and information to user equipment.
  • the input device 804 is a keyboard or pointing device, such as a mouse, trackball, touchpad, microphone, joystick, game pad, cone-shaped satellite TV antenna, scanner or Similar equipment. These input devices can be connected to the processor 801 through the bus 803.
  • the output device 805 can be used for user equipment to output information. In addition to the display, the output device 805 can also provide other peripheral output devices, such as speakers. These output devices can also be connected to the processor 801 through the bus 803.
  • the user equipment may be connected to the network through the network interface 806, for example, connected to the WIFI network, 5G network, 2/3G network, 4G network, etc. through a wireless interface.
  • the computer-executable instructions stored in the user equipment can be stored in a remote storage device, not limited to local storage.
  • the user equipment can execute the method steps on the user equipment side in the above embodiments, for example, execute steps 209, 213, 314, 318, 401, 416, 504, 511, etc.
  • FIG. 9 is a schematic diagram of a service node device provided by an embodiment of the present application.
  • the service node device mainly includes a determination module 901, a selection module 902, and a session establishment module 903.
  • the determining module 901 is configured to determine that the user equipment has 5G capability or the user corresponding to the user equipment is a 5G user when the user equipment is attached to the 2/3G network;
  • the selection module 902 is configured to select a 5G gateway for the user equipment
  • the session establishment module 903 is used to establish a session with the 5G gateway.
  • the service node device provided in this embodiment can be used in the method for realizing business continuity provided in the previous embodiment.
  • the business continuity of the user equipment is realized through the cooperation of the determining module 901, the selecting module 902, and the session establishing module 903, which solves the problem.
  • the determining module 901 determining that the user corresponding to the user equipment is a 5G user specifically includes:
  • the service node device provided in this application further includes a receiving module 904 configured to receive an attachment request sent by the user equipment, where the attachment request carries the 5G capability of the user equipment.
  • the determining module 901 determines that the user equipment has 5G capability according to the received attachment request.
  • the receiving module 904 is also configured to receive a bearer allocation request sent by the user equipment.
  • the service node equipment provided in this application also includes:
  • the obtaining module 905 is configured to obtain the 5G network parameters of the user equipment from the 5G gateway after receiving the bearer allocation request sent by the user equipment;
  • the sending module 906 is configured to send the 5G network parameters to the user equipment through a bearer allocation response. Therefore, the user equipment can receive the bearer allocation response and save the 5G network parameters carried therein, so that these 5G parameters can be used directly after moving to the 5G network.
  • the receiving module 904 is further configured to receive an activation context request message sent by the user equipment, and the activation context request message carries a protocol data unit PDU session identifier;
  • Establishing a session with the 5G gateway by the session establishment module 903 in the service node device includes: sending a PDP context creation request message to the 5G gateway for requesting the creation of a PDP context for the user equipment.
  • the context request message carries the PDU session identifier; the PDP context creation response message sent by the 5G gateway is received, thereby creating a session between the serving node device and the 5G gateway.
  • the create PDP context response carries 5G network parameters allocated for the user equipment.
  • the sending module 906 in the serving node device is further configured to send an activation context response message to the user equipment, where the activation context response message carries the 5G network parameters.
  • the selection module 902 selects a 5G gateway for the user equipment including: generating a fully qualified domain name FQDN of the 5G gateway or sending it to the domain name system or the fully qualified domain name FQDN of the 5G gateway, using all The FQDN requests the domain name system address resolution to obtain the address of the 5G gateway.
  • the service node equipment in the above-mentioned embodiments is presented in the form of functional modules.
  • the “module” herein may refer to a specific application integrated circuit, a processor and memory that executes one or more software or firmware programs, and an integrated logic circuit. , And/or other devices that can provide the above functions.
  • the functions implemented by the determining module 901 and the selection module 902 in the service node device can all be implemented by the processor 701 and the memory 702 in FIG. 7.
  • the function that the determining module 901 determines that the user equipment has 5G capability or that the user corresponding to the user equipment is a 5G user may be implemented by the processor 701 executing the code stored in the memory 702.
  • the function of the selection module 902 to select the 5G gateway for the user equipment may also be implemented by the processor 701 executing the code stored in the memory 702.
  • FIG. 10 is a schematic diagram of a 5G gateway provided by an embodiment of the present application.
  • the 5G gateway may include a receiving module 1001, a parameter allocation module 1002, and a sending module 1003.
  • the receiving module 1001 is configured to receive a session creation request sent by a mobility management device or a service node device, and the session creation request carries indication information that the user equipment has 5G capability or that the user signs up for 5G services;
  • the parameter allocation module 1002 is configured to allocate 5G network parameters to the user;
  • the sending module 1003 is configured to send the allocated 5G network parameters to the mobility management device or the service node device.
  • the 5G gateway device provided in this embodiment can be used in the method for realizing business continuity provided in the previous embodiment.
  • the cooperation of the receiving module 1001, the parameter allocation module 1002, and the sending module 1003 can realize the business continuity of the user equipment, which solves the problem.
  • the sending module 1003 may specifically send the allocated 5G network parameters to the mobility management device through a create session response message or an update bearer request message.
  • the sending module 1003 can also send the assigned 5G network parameters to the service node device by creating a session response message, so that the service node device or mobility management device can forward the 5G network parameters to the user equipment, so that the user equipment can move to the 5G network. After use.
  • the receiving module 1001 is further configured to receive the correspondence between the packet data unit PDU session identifier and the bearer identifier sent by the mobility management device or the service node device.
  • the 5G gateway further includes a parameter application module 1003, configured to determine the PDU session corresponding to the user equipment according to the corresponding relationship, and then apply the 5G network parameter to the PDU session.
  • the parameter allocation module 1002 is further configured to allocate 2/3G network parameters and 4G network parameters corresponding to the 5G network parameters to the user.
  • the sending module 1003 in the 5G gateway is further configured to send the 2/3G network parameters and the 4G network parameters to the mobility management device or the service node device.
  • the user equipment can save 2/3G network parameters, 4G network parameters, and 5G network parameters, which is convenient for subsequent use.
  • the 5G gateway device in the above embodiment is presented in the form of a functional module.
  • the “module” here can refer to a specific application integrated circuit, a processor and memory that executes one or more software or firmware programs, and an integrated logic circuit. , And/or other devices that can provide the above functions.
  • the functions implemented by the receiving module 1001 and the parameter allocation module 1002 in the 5G gateway can all be implemented by the processor 701 and the memory 702 in FIG. 7.
  • the function of the receiving module 1001 to receive a session creation request sent by a mobility management device or a service node device may be implemented by the processor 701 executing the code stored in the memory 702.
  • the function of the parameter allocation module 1002 to allocate 5G network parameters to the user may also be implemented by the processor 701 executing the code stored in the memory 702.
  • FIG. 11 is a schematic diagram of a user equipment provided by an embodiment of the present application.
  • the user equipment may include a sending module 1101 and a receiving module 1102.
  • the sending module 1101 is configured to send a PDP context activation request message to the serving node device to activate the PDP context when the user equipment accesses the 2/3G network, and the PDP context activation request message carries an indication that the user equipment has 5G capability information.
  • the receiving module 1102 is configured to receive an activation PDP context response message sent by the serving node device, where the activation PDP context request message carries 5G network parameters. Therefore, when the user equipment subsequently moves to the 5G network, these 5G network parameters are used.
  • the sending module 1101 in the user equipment may also send a tracking area update request message to the mobility management device for tracking area update, and the tracking area update request message carries an indication that the user equipment has 5G capability. Then, the receiving module 1102 in the user equipment may also receive a tracking area update response message sent by the mobility management device, and the tracking area update response message carries 5G network parameters.
  • the tracking area update response message received by the receiving module 1102 also carries 2/3G network parameters and 4G network parameters corresponding to the 5G network parameters.
  • the sending module 1101 in the user equipment may also send a bearer resource allocation request message to the mobility management device to request the allocation of bearer resources.
  • the bearer resource allocation request message carries an indication that the user equipment has 5G capability.
  • the receiving module 1102 in the user equipment receives a bearer resource allocation response message sent by the mobility management device, and the bearer resource allocation response message carries 5G network parameters.
  • the bearer resource allocation response message received by the receiving module 1102 also carries 2/3G network parameters and 4G network parameters corresponding to the 5G network parameters.
  • the sending module 1101 in the user equipment may also send a PDP context activation request to the mobility management device.
  • the activation PDP context request carries the indication information that the user equipment has 5G capability, and then the user equipment
  • the receiving module 1102 receives an activation PDP context response sent by the mobile management device, where the activation PDP context response carries 5G network parameters.
  • the activation PDP context response message received by the receiving module 1102 in the user equipment also carries 2/3G network parameters and 4G network parameters corresponding to the 5G network parameters.
  • the receiving module 1102 in the user equipment may also receive a bearer context modification request message sent by the mobility management device, and the bearer context modification request message carries 5G network parameters; then, the storage module 1103 in the user equipment
  • the 5G network parameters can be saved, and when moving to the 5G network subsequently, the 5G network parameters can be used directly to maintain business continuity.
  • the sending module 1101 in the user equipment may also send a modified bearer context accept message to the mobility management entity.
  • the modified bearer context accept message carries the correspondence between the PDU session identifier and the EPS bearer identifier. Relationship.
  • the indication information that the user equipment has 5G capability is the identifier of the PDU session, the correspondence between the identifier of the PDU session and the EPS bearer identifier, and the identifier of the PDU session and the PDP context identifier. At least one of the corresponding relationships.
  • the sending module 1101 in the user equipment may also send a PDU session establishment request to the AMF for establishing a PDU session;
  • the receiving module 1102 in the user equipment also receives a PDU session establishment complete message sent by the AMF, and the PDU session establishment complete message carries 5G network parameters and 2/3G network parameters and 4G network parameters corresponding to the 5G network parameters. parameter.
  • the storage module 1103 in the user equipment can save the 2/3G network parameters and 4G network parameters, and then directly use the 2/3G network parameters and 4G network parameters when moving to the 2/3G network or 4G network. Obtaining these parameters from the core network equipment further improves business continuity.
  • the functions implemented by the functional modules such as the sending module 1101 and the receiving module 1102 can all be implemented by the processor 801 and the memory 802 in FIG. 8.
  • the function of receiving the PDU session establishment completion message sent by the AMF by the receiving module 1102 may be implemented by the processor 801 executing the code stored in the memory 802.
  • the function of the sending module 1101 to send a PDU session establishment request to the AMF may also be implemented by the processor 801 executing the code stored in the memory 802.

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Abstract

本申请实施例公开了一种实现业务连续的方法、相关设备和系统。其中，服务节点设备在用户设备附着2/3G网络时，确定用户设备具有5G能力或用户设备对应的用户为5G用户，然后服务节点设备为该用户设备选择5G网关，并建立与该5G网关之间的会话。从而在后续用户设备移动到5G网络时，由相同的5G网关对用户设备提供服务，用户的地址可以在从2/3G网络移动到5G网络时保持不变，从而实现用户的业务连续。

Description

实现业务连续的方法、相关装置及系统
本申请要求于2019年7月18日提交中国国家知识产权局、申请号为201910649087.8、发明名称为“实现业务连续的方法、相关装置及系统”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
本申请涉及通信技术领域，尤其涉及一种实现业务连续的方法、相关装置及系统。
背景技术
在现有的移动通信网络中，第二代(2nd Generation，2G)网络或第三代(3rd Generation，3G)网络(简称2/3G网络)和第四代(4th Generation，4G)网络的覆盖均比第五代(5th Generation，5G)网络覆盖范围更广。因此，当用户设备在移动时，可能从2/3G网络接入，然后移动到4G网络，再移动到5G网络。或者，用户在2/3G网络接入后，直接移动到5G网络。
现有技术提供了一种用户设备在5G网络和4G网络之间移动实现业务连续的方法，但如果用户设备接入2/3G网络后，从2/3G网络移动到5G网络，此时UE需要重新接入5G网络，导致用户在2/3网络下使用的业务中断，无法保持业务连续。
发明内容
本申请实施例提供一种实现业务连续的方法，可以解决现有技术中用户设备从2/3G网络移动到5G网络带来的业务中断问题。
第一方面，本申请实施例提供了一种实现业务连续的方法，应用于通信网络中的服务节点设备，主要步骤包括；
服务节点设备在用户设备附着2/3G网络时，确定所述用户设备具有5G能力或所述用户设备对应的用户为5G用户，然后服务节点设备为该用户设备选择5G网关，并建立与该5G网关之间的会话。从而在后续用户设备移动到5G网络时，由相同的5G网关对用户设备提供服务，用户的地址可以在从2/3G网络移动到5G网络时保持不变，从而实现用户的业务连续。
在可选的实施方式中，服务节点设备确定所述用户设备对应的用户为5G用户可以通过如下方式：
所述服务节点设备接收用户设备发送的附着请求，所述附着请求中携带用户标识；其中，该附着请求用户请求附着到所述2/3G网络。随后，服务节点设备根据所述用户标识向用户数据服务器获取所述用户设备对应的用户的签约数据，根据获取的签约数据确定所述用户设备对应的用户为5G用户。
在可选的实施方式中，服务节点设备可以确定用户设备具有5G能力且所述用户为5G用户，然后服务节点设备为该用户设备选择5G网关。
在可选的实施方式中，服务节点设备接收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的5G能力。从而，服务节点设备根据接收到的附着请求即可确定用户设备具有5G能力。
在可选的实施方式中，服务节点设备建立与所述5G网关之间的会话包括：
所述服务节点设备向所述5G网关发送创建分组数据协议(packet data protocol,PDP)会话请求，接收所述5G网关返回的创建PDP会话响应消息。
在可选的实施方式中，服务节点设备接收到的PDP会话响应消息中携带所述用户设备的2/3G网络参数，所述服务节点设备进一步向用户设备发送所述2/3G网络参数，便于UE使用2/3G网络。
在可选的实施方式中，移动管理设备还在接收到所述用户设备发送的跟踪区更新请求后，向所述5G网关获取所述用户设备的5G网络参数，随后移动管理设备通过跟踪区更新响应向所述用户设备发送所述5G网络参数，便于用户设备移动到5G网络后使用。
在可选的实施方式中，移动管理设备接收到的跟踪区更新请求中还携带分组数据单元(packed data unit，PDU)会话标识和演进分组系统(evolved packet system，EPS)承载标识的对应关系；其中，PDU会话是用户设备移动5G后使用的，EPS承载是用户设备在4G网络中使用的。移动管理设备通过创建会话请求消息向所述5G网关发送所述PDU会话标识和EPS承载标识的对应关系，5G网关可以接收该创建会话请求消息，保存其中携带的所述PDU会话标识和EPS承载标识的对应关系。
随后，移动管理设备接收所述5G网关返回的创建会话响应消息，其中携带所述5G网络参数。移动管理设备可以通过跟踪区更新响应向所述用户设备发送所述5G网络参数，便于用户设备移动到5G网络后使用。
在可选的实施方式中，5G网关可以在用户设备移动到5G网络后，使用该PDU会话标识和EPS承载标识的对应关系找到用户设备的PDU会话，并对该PDU会话应用5G网络参数。
在可选的实施方式中，所述服务节点设备接收到所述用户设备发送的承载分配请求，然后向所述5G网关获取所述用户设备的5G网络参数。在获取到5G网络参数后，服务节点设备通过承载分配响应向所述用户设备发送所述5G网络参数。
在可选的实施方式中，承载分配响应可以为承载修改请求消息。
在可选的实施方式中，用户设备发送的承载分配请求中还携带分组数据单元PDU会话标识和演进分组系统EPS承载标识的对应关系，所述移动管理设备通过承载资源请求向所述5G网关发送所述PDU会话标识和EPS承载标识的对应关系，随后移动管理设备接收所述5G网关发送的承载资源响应，其中携带所述5G网络参数。移动管理设备通过承载修改请求消息将5G网络参数发给用户设备。
在可选的实施方式中，移动管理设备接收所述5G网关发送的所述用户的5G网络参数，然后移动管理设备向所述用户设备发送所述5G网络参数。
在可选的实施方式中，移动管理设备接收所述用户设备发送的承载修改请求，其中携 带分组数据单元PDU会话标识和演进分组系统EPS承载标识的对应关系，然后移动管理设备向所述5G网关发送所述PDU会话标识和EPS承载标识的对应关系，以便于5G网关保存该PDU会话的标识和EPS承载的标识的对应关系。
在可选的实施方式中，服务节点设备接收用户设备发送的激活上下文请求消息，所述激活上下文请求消息中携带协议数据单元PDU会话标识。
此时，所述服务节点设备建立与所述5G网关之间的会话包括：
所述服务节点设备向所述5G网关发送创建PDP上下文请求消息，用于请求对所述用户设备创建PDP上下文，所述创建上下文请求消息中携带所述PDU会话标识；
所述服务节点设备接收所述5G网关发送的创建PDP上下文响应消息。
在可选的实施方式中，服务节点设备接收到的创建PDP上下文响应消息中还携带为所述用户设备分配的5G网络参数，然后服务节点设备向所述用户设备发送激活上下文响应消息，所述激活上下文响应消息中携带所述5G网络参数。
在可选的实施方式中，服务节点设备为所述用户设备选择5G网关包括：
所述服务节点设备生成或向域名系统获取5G网关的全合格域名FQDN，然后使用FQDN向所述域名系统获取5G网关的地址。
在可选的实施方式中，所述服务节点设备从所述5G网关获取所述用户的5G网络参数，然后服务节点设备向所述用户设备发送所述5G网络参数。
第二方面，本申请实施例提供一种实现业务连续的方法，其主要包括：
5G网关接收移动管理设备或服务节点设备发送的创建会话请求，所述创建会话请求中携带用户设备具有5G能力或用户签约5G业务的指示信息，然后5G网关为所述用户设备对应的用户或为所述用户分配5G网络参数，并向所述移动管理设备或所述服务节点设备发送所述分配的5G网络参数。从而，移动管理设备或服务节点设备可以向用户设备转发5G网络参数，用户设备可以保存这些5G网络参数，并在移动到5G网络后使用，实现业务的连续。
在可选的实施方式中，所述5G网关可以在用户设备接入4G网络时，接收移动管理设备发送的创建会话请求。5G网关可以在用户设备接入2/3G网络时，接收服务节点设备发送的创建会话请求。从而，5G网关可以在用户设备接入5G网络之前，对用户设备分配5G参数，从而用户设备在接入到5G网络后直接使用这些5G网络参数，实现业务的连续。
在可选的实施方式中，所述5G网关通过创建会话响应消息或更新承载请求消息向所述移动管理设备发送所述分配的5G网络参数。
在可选的实施方式中，所述5G网关通过创建会话响应消息向所述服务节点设备发送所述分配的5G网络参数。
在可选的实施方式中，5G网关接收移动管理设备或所述服务节点设备发送的分组数据单元PDU会话标识和承载标识的对应关系，然后5G网关根据所述对应关系确定所述用户设备对应的PDU会话，并对所述PDU会话应用所述5G网络参数。
在可选的实施方式中，承载标识包括演进分组系统EPS承载标识或PDP上下文标识。
在可选的实施方式中，所述5G网关为所述用户分配与所述5G网络参数对应的2/3G网络参数和4G网络参数，从而5G网关除了向移动管理设备或所述服务节点设备发送5G 参数外，还向所述移动管理设备或所述服务节点设备发送所述2/3G网络参数和所述4G网络参数，便于用户设备在2/3G、4G和5G中享受类似的服务。
第三方面，本申请实施例提供一种实现业务连续的方法，其主要包括：
用户设备接入2/3G网络时向服务节点设备发送激活PDP上下文请求消息以激活PDP上下文，所述激活PDP上下文请求消息中携带所述用户设备具有5G能力的指示信息。随后，用户设备接收所述服务节点设备发送的激活PDP上下文响应消息，所述激活PDP上下文请求消息中携带5G网络参数。
第四方面，本申请实施例提供一种实现业务连续的方法，其主要包括：
用户设备向移动管理设备发送跟踪区更新请求消息以进行跟踪区更新，所述跟踪区更新请求消息中携带所述用户设备具有5G能力的指示信息，随后用户设备接收所述移动管理设备发送的跟踪区更新响应消息，所述跟踪区更新响应消息中携带5G网络参数。
在可选的实施方式中，所述跟踪区更新响应消息中还携带与所述5G网络参数对应的2/3G网络参数和4G网络参数。
第五方面，本申请实施例提供一种实现业务连续的方法，其主要包括：
用户设备向移动管理设备发送承载资源分配请求消息以请求分配承载资源，所述承载资源分配请求消息中携带所述用户设备具有5G能力的指示信息，随后用户设备接收所述移动管理设备发送的承载资源分配响应消息，所述承载资源分配响应消息中携带5G网络参数。
在可选的实施方式中，所述承载资源分配响应消息中还携带与所述5G网络参数对应的2/3G网络参数和4G网络参数。
第六方面，本申请实施例提供一种实现业务连续的方法，其主要包括：
用户设备向移动管理设备发送激活PDP上下文请求，所述激活PDP上下文请求中携带所述用户设备具有5G能力的指示信息，随后用户设备接收所述移动管理设备发送的激活PDP上下文响应，所述激活PDP上下文响应中携带5G网络参数。
在可选的实施方式中，用户设备接收到的激活PDP上下文响应消息中还携带与所述5G网络参数对应的2/3G网络参数和4G网络参数。
第七方面，本申请实施例提供一种实现业务连续的方法，其主要包括：
用户设备接收移动管理设备发送的修改承载上下文请求消息，所述修改承载上下文请求消息中携带5G网络参数；然后，所述用户设备保存所述5G网络参数。
在可选的实施方式中，用户设备向所述移动管理实体发送修改承载上下文接受消息，所述修改承载上下文接受消息中携带PDU会话的标识和EPS承载标识之间的对应关系中。
在以上第三到第七方面提供的方案中，用户设备可以保存该5G网络参数，并在随后移动到5G网络时，直接使用该5G网络参数，保持业务连续。
在以上第三到第七方面提供的方案中，上述用户设备具有5G能力的指示信息为PDU会话的标识、所述PDU会话的标识和EPS承载标识之间的对应关系、所述PDU会话的标识和PDP上下文标识之间的对应关系中的至少一种。
在以上第三到第七方面提供的方案中，用户设备从所述2/3G网络移动到5G网络时，使用所述5G网络参数进行数据业务。
在以上第三到第七方面提供的方案中，所述5G网络参数包括服务质量和业务流模板。
第八方面，本申请实施例提供一种实现业务连续的方法，其主要包括：
用户设备向AMF发送PDU会话建立请求，用于建立PDU会话；
所述用户设备接收所述AMF发送的PDU会话建立完成消息，所述PDU会话建立完成消息中携带5G网络参数以及所述5G网络参数对应的2/3G网络参数和4G网络参数。
其中，用户设备可以保存该2/3G网络参数和4G网络参数，并在随后移动到2/3G网络或4G网络时，直接使用2/3G网络参数和4G网络参数，不需要向核心网设备获取这些参数，进一步提高了业务的连续性。
第九方面，本申请实施例提供一种服务节点设备，其包括：
相互耦合的非易失性存储器和处理器，处理器调用存储在所述存储器中的程序代码，以使得所述服务节点设备执行如第一方面所述的方法。
第十方面，本申请实施例提供一种5G网关，其包括：
相互耦合的非易失性存储器和处理器，所述处理器调用存储在所述存储器中的程序代码，以使得所述5G网关执行如第二方面所述的方法。
第十一方面，本申请实施例提供一种服务节点设备，其主要包括：
确定模块，用于在用户设备附着2/3G网络时，确定所述用户设备具有5G能力或所述用户设备对应的用户为5G用户；
选择模块，用于为所述用户设备选择5G网关；
会话建立模块，用于建立与所述5G网关之间的会话。
本实施例提供的服务节点设备可以使用在前述第一方面提供的实现业务连续的方法中，通过确定模块、选择模块以及会话建立模块之间的配合实现用户设备的业务连续，解决了现有技术中用户设备从2/3G网络移动到5G网络带来的业务中断问题。
在可选的实施方式中，服务节点设备中的确定模块确定所述用户设备对应的用户为5G用户具体包括：
接收用户设备发送的附着请求，所述附着请求中携带用户标识；根据所述用户标识向用户数据服务器获取所述用户设备对应的用户的签约数据，然后根据所述签约数据确定所述用户为5G用户。
在可选的实施方式中，服务节点设备还包括接收模块，用于接收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的5G能力。此时，接收模块还根据接收到的附着请求来确定用户设备具有5G能力。
在可选的实施方式中，服务节点设备的会话建立模块建立与5G网关之间的会话包括：
向所述5G网关发送创建分组数据协议PDP会话请求，接收所述5G网关返回的创建PDP会话响应消息。
在可选的实施方式中，服务节点设备还包括：
获取模块，用于在接收到所述用户设备发送的承载分配请求后，向所述5G网关获取所述用户设备的5G网络参数；
发送模块，用于通过承载分配响应向所述用户设备发送所述5G网络参数。从而用户设备可以接收承载分配响应，保存其中携带的5G网络参数，便于后续在移动到5G网络后 直接使用这些5G参数。
在可选的实施方式中，服务节点设备中的接收模块还用于接收用户设备发送的激活上下文请求消息，所述激活上下文请求消息中携带协议数据单元PDU会话标识；
所述服务节点设备中的会话建立模块建立与所述5G网关之间的会话包括：向所述5G网关发送创建PDP上下文请求消息，用于请求对所述用户设备创建PDP上下文，所述创建上下文请求消息中携带所述PDU会话标识；接收所述5G网关发送的创建PDP上下文响应消息，从而创建了服务节点设备和5G网关之间的会话。
其中，创建PDP上下文响应携带为所述用户设备分配的5G网络参数。服务节点设备中的发送模块还用于向所述用户设备发送激活上下文响应消息，所述激活上下文响应消息中携带所述5G网络参数。
在可选的实施方式中，本申请提供的服务节点设备中的选择模块为所述用户设备选择5G网关包括：生成5G网关的全合格域名FQDN或者向域名系统或所述5G网关的全合格域名FQDN，使用所述FQDN请求所述域名系统地址解析获得5G网关的地址。
第十二方面，本申请实施例提供一种5G网关，主要包括：接收模块、参数分配模块以及发送模块。
其中，接收模块用于接收移动管理设备或服务节点设备发送的创建会话请求，所述创建会话请求中携带用户设备具有5G能力或用户签约5G业务的指示信息；
参数分配模块用于为所述用户设备对应的用户或所述用户分配5G网络参数；
发送模块用于向所述移动管理设备或所述服务节点设备发送所述分配的5G网络参数。
本实施例提供的5G网关设备可以使用在前述实施例提供的实现业务连续的方法中，通过接收模块、参数分配模块以及发送模块之间的配合实现用户设备的业务连续，解决了现有技术中用户设备从2/3G网络移动到5G网络带来的业务中断问题。
在可选的实施方式中，5G网关中的发送模块具体可以通过创建会话响应消息或更新承载请求消息向所述移动管理设备发送所述分配的5G网络参数。此外，发送模块还可以通过创建会话响应消息向服务节点设备发送所述分配的5G网络参数，便于服务节点设备或移动管理设备向用户设备转发5G网络参数，从而用户设备可以在移动到5G网络后使用。
在可选的实施方式中，5G网关中的接收模块还用于接收移动管理设备或所述服务节点设备发送的分组数据单元PDU会话标识和承载标识的对应关系。此时，5G网关还包括参数应用模块903，用于根据所述对应关系确定所述用户设备对应的PDU会话，然后对所述PDU会话应用所述5G网络参数。
在可选的实施方式中，5G网关中的参数分配模块还用于为所述用户分配与所述5G网络参数对应的2/3G网络参数和4G网络参数。此时，5G网关中的发送模块还用于向所述移动管理设备或所述服务节点设备发送所述2/3G网络参数和所述4G网络参数。从而，用户设备可以保存2/3G网络参数、4G网络参数和5G网络参数，便于后续使用。
第十三方面，本申请实施例提供一种通信系统，其特征在于，包括：
服务节点设备和5G网关，所述服务节点设备配置于：
在用户设备附着2/3G网络时，确定所述用户设备具有5G能力或所述用户设备对应的用户为5G用户；
所述服务节点设备为所述用户设备选择5G网关，并建立与所述5G网关之间的会话；
所述5G网关配置于和所述服务节点设备建立会话。
在可选的实施方式中，上述通信系统的5G网关进一步配置于接收移动管理设备或服务节点设备发送的创建会话请求，所述创建会话请求中携带所述用户设备具有5G能力或所述用户为5G用户的指示信息，为所述用户分配5G网络参数，并向所述移动管理设备或所述服务节点设备发送所述分配的5G网络参数。
在可选的实施方式中，上述通信系统还可以包括移动管理设备，移动管理设备配置于接收所述5G网关发送的所述用户的5G网络参数，然后向所述用户设备发送所述5G网络参数。
在可选的实施方式中，服务节点设备和移动管理设备还可以配置于执行以上第一方面所述的方法，5G网关可以配置于执行以上第二方面所述的方法，具体参见上述第一方面和第二方面。
在可选的实施方式中，通信系统还可以包括用户设备、用户数据服务器等。
第十四方面，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存储了程序代码，其中，所述程序代码包括用于执行第一方面到第八方面的任意一种方法的部分或全部步骤的指令。
第十五方面，本申请实施例提供一种计算机程序产品，当所述计算机程序产品在计算机上运行时，使得所述计算机执行第一方面到第八方面的任意一种方法的部分或全部步骤。
在以上任一方面所述的实施例中，用户标识可以为用户的全球唯一临时标识，国际移动用户识别码，移动台国际ISDN号码，IP多媒体私有标识，IP多媒体公共标识或国际移动设备识别码。
在以上任一方面所述的实施例中，所述5G网关为融合了2/3G网关、4G网关和5G网关的设备。
在以上任一方面所述的实施例中，所述5G网关为会话管理功能设备。
在以上任一方面所述的实施例中，所述服务节点设备为服务通用分组无线业务支持节点设备，所述移动管理设备为移动管理实体。
附图说明
为了更清楚地说明本申请实施例或背景技术中的技术方案，下面将对本申请实施例或背景技术中所需要使用的附图进行说明。
图1为本申请实施例提供的通信系统的示意图；
图2是本申请实施例提供的实现业务连续的方法的流程图；
图3是本申请实施例提供的另一种实现业务连续的方法的流程图；
图4是本申请实施例提供的另一种实现业务连续的方法的流程图；
图5是本申请实施例提供的另一种实现业务连续的方法的流程图；
图6是本申请实施例提供的另一种实现业务连续的方法的流程图；
图7是本申请实施例提供的服务节点设备、5G网关和移动管理设备的示意图；
图8是本申请实施例提供的用户设备的示意图；
图9是本申请实施例提供的服务节点设备的示意图；
图10是本申请实施例提供的5G网关的示意图；
图11是本申请实施例提供的用户设备的示意图。
具体实施方式
下面结合本申请实施例中的附图对本申请实施例进行详细描述。
参见图1，图1为本申请实施例提供的通信系统的示意图。
在本申请实施例提供的通信系统中包括2/3G接入网设备、4G接入网设备、5G接入网设备和核心网的设备。其中，接入网设备可以包括基站等。核心网的设备可以包括用户数据服务器、服务节点设备,5G网关和移动管理设备。
2/3G接入网通过服务节点设备接入核心网，4G接入网通过移动管理设备接入核心网，5G接入网可以通过移动管理设备接入核心网，也可以通过5G网关接入核心网。从而，用户设备(user equipment，UE)可以通过2/3G接入网设备接入核心网，通过4G接入网设备接入核心网，或通过5G接入网设备接入核心网。
2G网络可以包括全球移动通信系统(global system for mobile communication，GSM)网络，码分多址接入(code division multiple access，CDMA)网络，3G网络可以包括宽带码分多址接入(wideband code division multiple access，WCDMA)，CDMA2000网络和时分同步码分多址(time division-synchronous code division multiple access，TD-SCDMA)网络，4G网络包括长期演进(long term evolution，LTE)LTE网络。5G网络包括新空口(new radio，NR)网络等。另外，为描述方便，本实施例中的2/3G接入网简称2/3G网络，4G接入网络简称4G网络，5G接入网络简称5G网络。
其中，服务节点设备具体可以为服务通用分组无线业务支持节点(serving general packet radio service support node，SGSN)，主要用于2G和3G网络的UE的移动管理。网关通用分组无线业务支持节点(gateway general packet radio service support node，GGSN)主要用于2G和3G网络的会话管理和UE数据转发。SGSN可以独立部署，也可以合和GGSN并部署在一起。
移动管理设备也可以称为移动管理实体(mobility management entity，MME)，其主要负责4G网络中处于空闲模式的UE的定位，传呼过程等。
5G网关在本实施例中包括会话管理功能(session management function，SMF)设备，其可以实现对接入5G网络的UE的会话管理。
5G网关还可以为融合了GGSN、服务网关(serving gateway，SGW)、分组数据网络网关(packet data network gateway，PGW)和SMF各自功能的融合网关(简称融合5G网关)。如果控制面和用户面分离部署，则本实施例中的5G网关可以为融合了SMF、GGSN的控制面功能、SGW的控制面功能和PGW的控制面功能的设备。
用户数据服务器中可以存储用户的签约数据，其可以为融合了统一数据管理(unified data management，UDM)设备，归属用户服务器(home subscriber server，HSS)和归属位置寄存器(home location register，HLR)的功能的设备，或者具备UDM、HSS、HLR 独立功能的设备。
UE支持接入2/3G、4G和5G网络，可以在2/3G网络、4G网络、5G网络中自由移动。
在本实施例提供的通信系统中，支持5G接入网络的UE首先通过2/3G接入网接入，UE向2/3G网络发起附着请求，SGSN接收到UE的附着请求后，确定该用户设备是否具有5G能力或确定该UE对应的用户是否签约了5G业务，若用户设备具有5G能力或用户签约了5G业务，则SGSN为该用户设备选择5G网关，然后与5G网关建立会话。与现有技术相比，本实施例中的UE在附着到2/3G网络时，可以选择到5G网关，由5G网关为UE提供服务。从而在后续从2/3G网络移动到5G网络时，依然由该5G网关提供服务，从而实现用户在2/3G网络下的数据业务(例如视频通话、在线视频等)在5G网络下继续保持，提高了用户的业务体验。
为详细的理解本申请实施例，下面提供详细的方法流程来描述本申请提供的实现业务连续性的方法。
参考图2，图2是本申请实施例提供的实现业务连续的方法的流程图。
本实施例提供的方法主要包括如下步骤：
步骤201、5G用户设备在2/3G网络接入，向2/3G网络发送附着请求。
在本实施例中，支持2/3G、4G和5G接入的UE首先在2/3G网络接入，例如用户处于电梯或车库等位置。UE接入2/3G时，向2/3G网络设备发送附着(attach)请求。其中，该附着请求通过2/3G无线接入网转发到SGSN。
附着请求中可以携带用户标识、UE的5G能力。此外，附着请求中还可以携带UE的位置信息。
其中，UE的5G能力可以通过附着请求中的UE Network Capability或MS Network Capability参数来携带。例如该参数的值为N1 mode support，则表明UE具有5G能力，即UE支持接入5G网络。
步骤202、SGSN向用户数据服务器发起位置更新。
SGSN在收到UE的附着请求后，向用户数据服务器发起位置更新。
其中，SGSN可以向用户数据服务器发送更新位置请求消息，其中携带用户标识。用户标识可以为全球唯一临时标识(globally unique temporary identifier，GUTI)、国际移动用户识别码，移动台国际ISDN号码或国际移动设备识别码等。
用户数据服务器记录UE的位置，并根据用户标识获取用户的签约数据，然后向SGSN发送更新位置响应消息，该响应消息中携带用户的签约数据。例如，签约数据中携带的5G签约信息具体为：允许进入5G核心网(Core Network Restriction参数)和允许承载切换到5G的能力(Interworking 5GS Indicator参数)。
步骤203、SGSN向UE发送附着接受消息。
SGSN在完成UE的位置更新后，可以向UE发送附着接受(attach accept)消息。
步骤204、UE向SGSN发送激活分组数据协议PDP上下文请求。
其中，分组数据协议PDP上下文(context)请求用于向SGSN请求激活UE的PDP上下文。
步骤205、SGSN确定UE对应的用户为5G用户。
在本实施例中，签约数据中携带用户签约了5G业务的信息，因而SGSN可以确定该UE对应的用户为5G用户。如果该签约数据中没有携带5G业务的信息，即UE没有签约5G业务，则MME确定该用户为非5G用户，执行正常的PDP上下文激活流程。
步骤206、SGSN为用户设备选择5G网关。
在本实施例中，SGSN可以根据路由区标识(routing area identity，RAI)全合格域名(fully qualified domain name，FQDN)来生成5G网关的FQDN，然后使用5G网关的FQDN向域名系统(domain name system，DNS)查询获取5G网关的地址。
此外，SGSN也可以直接使用RAI FQDN向DNS查询，获得网关的DNS解析结果，根据该解析结果来选择5G网关对应的域名，然后再使用5G网关对应的域名向DNS查询获得5G网关的地址。其中，DNS返回的解析结果中对5G网关和非5G网关进行了区分。例如5G网关的解析结果中携带“nc-smf”的能力标识。
在本实施例中，5G网关可以为SMF设备，也可以为融合了SMF、GGSN的控制面功能、SGW的控制面功能和PGW的控制面功能的设备。5G网关还可以为融合了GGSN、SGW、PGW和SMF各自功能的融合网关。
在另一可选的实施例中，SGSN也可以在判断UE对应的用户为5G用户，且用户设备具有5G能力的情况下，为UE选择5G网关。
步骤207、SGSN建立与5G网关之间的会话。
其中，SGSN和5G网关建立会话的步骤具体包括SGSN向5G网关发送创建PDP会话请求，5G网关向SGSN返回创建PDP会话响应，该响应中可以携带UE在2/3G网络的参数，例如服务质量QoS，IP地址等。
步骤208、SGSN在与5G网关的会话建立完成之后，向UE返回激活PDP上下文接受消息。
其中，SGSN返回给UE的激活PDP上下文接受消息中可以携带UE在2/3G网络中的参数，例如服务质量QoS、IP地址等。
UE在接收到激活PDP上下文接受消息后，完成PDP上下文的激活过程，UE可以使用上述2/3G网络中的参数进行数据业务。
在本实施例中，SGSN为UE选择5G网关之后，可以使得UE在随后移动到5G网络后，继续与之前选择的5G网关进行通信，UE的地址保持不变，从而业务不会中断。
步骤209、UE向移动管理实体MME发送跟踪区更新请求，执行跟踪区更新流程。
在本实施例中，UE从2/3G移动到4G网络，发起跟踪区更新(tracking area update，TAU)流程。跟踪区更新请求中携带UE所在的跟踪区的标识、UE的5G能力等参数。
此外，该跟踪区更新请求中还可以携带PDU会话标识(identifier，ID)和演进分组系统EPS承载标识的对应关系。其中，PDU会话标识ID和EPS承载ID的对应关系可以通过多种方式携带，例如可以直接在TAU请求中使用协议配置选项(protocol configuration options，PCO)信元携带，也可以封装在TAU请求的ESM Container信元中发送给移动管理实体。
UE在完成跟踪区更新后，可以继续在4G网络中使用数据业务。
步骤210、MME向5G网关发送创建会话请求，用于和5G网关创建会话。
在本实施例中，MME发送的创建会话请求中携带用户设备具有5G能力或用户签约5G业务的指示信息，以指示5G网关为该用户设备对应的用户分配5G网络参数(或简称5G参数)。
例如，创建会话请求中携带了Interworking 5GS Indicator参数，表明该用户签约了5G业务。或者，创建会话请求中携带了UE Network Capability参数，且值为N1 mode support，则表明该用户设备具有5G能力。
此外，创建会话请求中还可以携带上述PDU会话标识和EPS承载标识的对应关系。5G网关接收到创建会话请求后，可保存上述指示信息和PDU会话标识和EPS承载标识的对应关系。
此外，上述创建会话请求可以通过SGW传递给5G网关。
步骤211、5G网关为用户分配5G网络参数。
其中，5G网关在接收到MME发送的创建会话请求后，根据其中携带的指示信息为用户分配5G网络参数。例如，为用户分配5G QoS规则(rule)、Qos流描述(flow description)、业务流模板(traffic flow template,TFT)等参数，便于UE移动到5G网络后使用。
步骤212、5G网关通过创建会话响应向MME发送5G网络参数。
步骤213、MME通过跟踪区更新接受消息向UE发送该5G网络参数。
其中，MME可以通过TAU接受消息中的PCO信元来携带上述5G网络参数。MME发送跟踪区更新接受消息表明跟踪区更新流程结束。UE在完成TAU流程后，可以在该跟踪区内继续使用4G网络提供的数据业务。
UE接收到TUA接受消息后，保存其中携带的5G网络参数。随后，UE从4G网络移动到5G网络，UE可以继续与该5G网关通信。由于5G网关中保存了上述PDU会话标识和EPS承载标识的对应关系，从而5G网关可以直接找到UE在5G网络中使用的PDU会话，并对该PDU会话应用分配的5G网络参数。
此外，由于本实施例中提前将5G网络的参数发给了UE，UE在接入5G网络后，直接使用之前保存的5G网络参数继续数据业务，不需要向5G网关重新获取5G网络参数，进一步提高了业务的连续性。
参考图3，图3是本申请实施例提供的另一方法的流程图。
本实施例提供的实现业务连续的方法主要包括如下步骤：
步骤301、5G用户设备在2/3G网络接入，向2/3G网络发送附着请求。
步骤302、SGSN向用户数据服务器发起位置更新。
步骤303、SGSN向UE发送附着接受消息。
步骤304、UE向SGSN发送激活分组数据协议PDP上下文请求。
步骤305、SGSN确定UE对应的用户为5G用户。
步骤306、SGSN为用户设备选择5G网关。
步骤307、SGSN建立与5G网关之间的会话。
步骤308、SGSN在与5G网关的会话建立完成之后，向UE返回激活PDP上下文接受消息。
步骤309、UE向移动管理实体MME发送跟踪区更新请求，执行跟踪区更新流程。
其中，步骤301-309的执行过程和上述实施例中的步骤201-209相同，详情参见上述实施例，在此不再重复。
步骤310、MME向5G网关发送创建会话请求，用于和5G网关创建会话。
在本实施例中，创建会话请求中可以携带用户设备具有5G能力或用户签约5G业务的指示信息，以指示5G网关为该用户分配5G网络参数。
例如，创建会话请求中携带了Interworking 5GS Indicator参数，表明该用户签约了5G业务。或者，创建会话请求中携带了UE Network Capability参数，且值为N1 mode support，以表明该用户设备具有5G能力。
此外，创建会话请求中还可以携带上述PDU会话标识和EPS承载标识的对应关系。
在本实施例中，5G网关中融合了SMF、PGW和SGW的功能。从内部来看，5G网关中的SGW接收MME发送的创建会话请求，并将其中的指示信息通过修改承载请求modify bearer request发给SMF，SMF本地保存该指示信息，并回复修改承载响应modify bearer response给SGW。
步骤311、5G网关确定需要为该用户分配5G网络参数。
其中，5G网关中的SMF根据该指示信息确定需要为用户分配5G网络参数。
在本实施例中，5G网关中的SMF可以根据创建会话请求中的指示信息确定需要为该用户分配5G网络参数。若MME发送的创建会话请求中没有携带该指示信息，则5G网关不需要为该用户分配5G网络参数。
步骤312、5G网关向MME发送创建会话响应。
在本实施例中，5G网关中的SGW在接收SMF回复的修改承载响应后，向MME返回创建会话响应，表明MME和SGW之间的会话创建完成。由于5G网关融合了SGW的功能，SGW返回创建会话响应后，也可以认为MME和5G网关之间的会话创建完成。
步骤313、MME向UE发送TUA接受消息，完成TAU流程。
UE在完成TAU流程后，可以在该跟踪区内继续使用4G网络提供的数据业务。
步骤314、UE向MME发送承载资源分配请求，请求MME分配承载资源。
在本实施例中，UE发送的承载资源分配请求中可以携带PDU会话ID和EPS承载ID的对应关系。PDU会话标识ID和EPS承载ID的对应关系可以通过多种方式携带，例如可以直接在承载资源分配请求中使用PCO信元携带。
步骤315、MME向5G网关发送承载资源命令消息，其中携带PDU会话ID和EPS承载ID的对应关系。
在本实施例中，MME接收无线接入网设备转发的承载资源分配请求，然后向5G网关发送承载资源命令消息，其中携带PDU会话ID和EPS承载ID的对应关系。
步骤316、5G网关为用户分配5G网络参数。
在本实施例中，由于步骤311中5G网关确定了需要对该用户分配5G网络参数，则5G网关在接收到承载资源命令消息后，为该用户分配5G网络参数。
例如，5G网关为用户分配5G QoS rule、Qos流描述、业务流模板等参数，便于UE移动到5G网络后使用。
步骤317、5G网关通过更新承载请求向MME发送5G网络参数。
步骤318、MME通过承载修改请求向UE发送该5G网络参数。
其中，上述携带了5G网络参数的承载修改请求经过无线接入网设备转发给UE。UE接收到该承载修改请求后，完成承载资源的分配。同时，UE保存这些5G网络参数。UE还可以向MME返回承载修改响应。
随后，UE从4G网络移动到5G网络，UE可以继续与该5G网关通信。5G网关中还保存了上述PDU会话标识和EPS承载标识的对应关系，从而5G网关可以根据UE在4G网络中的EPS承载ID和上述对应关系确定UE在5G网络中使用的PDU会话的ID，查找到对应的PDU会话，并对该PDU会话应用分配的5G网络参数。
此外，由于本实施例中提前将5G网络的参数发给了UE，UE在接入5G网络后，直接使用之前保存的5G网络参数继续数据业务，不需要向5G网关重新获取5G网络参数，进一步提高了业务的连续性。
在另一可选的实施例中，步骤310中MME向5G网关发送的创建会话请求中可以不携带UE的5G能力的指示信息、用户签约5G业务的指示信息和PDU会话标识和EPS承载标识的对应关系。随后，5G网关中的SGW接收到该创建会话请求后，向MME返回创建会话响应，表明MME和SGW之间的会话创建完成。在该实施例中，5G网关在接收到MME发送的承载资源命令消息时(步骤315)，由于其中携带PDU会话标识，则5G网关可以确定需要为用户分配5G网络参数。5G网关在为该用户分配5G网络参数后，通过更新承载请求向MME发送该5G网络参数。也就是说，5G网关可以提前(在步骤311中)确定需要向用户分配5G网络参数，也可以在步骤315之后再确定需要向用户分配5G网络参数。
参考图4，图4是本申请实施例提供的另一方法的流程图。
本实施例提供的实现业务连续的方法主要包括如下步骤：
步骤401、5G用户设备在2/3G网络接入，向2/3G网络发送附着请求。
步骤402、SGSN向用户数据服务器发起位置更新。
步骤403、SGSN向UE发送附着接受消息。
步骤404、UE向SGSN发送激活分组数据协议PDP上下文请求。
步骤405、SGSN确定UE对应的用户为5G用户。
步骤406、SGSN为用户设备选择5G网关。
步骤407、SGSN建立与5G网关之间的会话。
步骤408、SGSN在与5G网关的会话建立完成之后，向UE返回激活PDP上下文接受消息。
步骤409、UE向移动管理实体MME发送跟踪区更新请求，执行跟踪区更新流程。
步骤410、MME向5G网关发送创建会话请求，用于和5G网关创建会话。
步骤411、5G网关确定需要为该用户分配5G网络参数。
步骤412、5G网关向MME发送创建会话响应。
步骤413、MME向UE发送TUA接受消息，完成TAU流程。
其中，步骤401-413的执行过程和上述实施例中的步骤301-313相同，详情参见上述 实施例，在此不再重复。
步骤414、5G网关为用户分配5G网络参数。
在本实施例中，由于步骤411中5G网关确定了需要对该用户分配5G网络参数，则5G网关主动为该用户分配5G网络参数。
例如，5G网关为用户分配5G QoS rule、Qos流描述、业务流模板等参数，便于UE移动到5G网络后使用。
步骤415、5G网关向MME发送更新承载请求，其中携带分配的5G网络参数。
步骤416、MME通过EPS承载修改请求消息向UE转发该5G网络参数。
UE接收MME发送的EPS承载修改请求消息，保存其中携带的5G网络参数。
步骤417、UE向MME返回EPS承载修改响应消息，其中携带PDU会话ID和EPS承载ID的对应关系。
步骤418、MME向5G网关发送更新承载响应，其中携带PDU会话ID和EPS承载ID的对应关系。
5G网关接收到更新承载响应后，保存其中携带的PDU会话ID和EPS承载ID的对应关系。
随后，UE从4G网络移动到5G网络，UE可以继续与该5G网关通信。5G网关中还保存了上述PDU会话标识和EPS承载标识的对应关系，从而5G网关可以根据该对应关系查找到UE在5G网络中使用的PDU会话，并对该PDU会话应用分配的5G网络参数。
在本实施例中，5G网关可以不需要等待UE发起承载资源分配请求，主动触发更新承载的流程，从而将5G网络参数发给UE。相对于上述实施例进一步提高了效率，保障UE的业务连续。
参考图5，图5是本申请实施例提供的另一方法的流程图。
本实施例提供的实现业务连续的方法主要包括如下步骤：
步骤501、5G用户设备在2/3G网络接入，向2/3G网络发送附着请求。
步骤502、SGSN向用户数据服务器发起位置更新。
步骤503、SGSN向UE发送附着接受消息。
其中，步骤501-503的执行过程和上述实施例中的步骤201-203相同，详情参见上述实施例，在此不再重复。
步骤504、UE向SGSN发送激活分组数据协议PDP上下文请求。
其中，PDP上下文请求中携带了PDU会话标识和PDP上下文标识的对应关系。
步骤505、SGSN确定UE对应的用户为5G用户或UE具有5G能力。
其中，SGSN可以根据上述PDU会话标识和PDP上下文标识的对应关系确定UE具有5G能力，进而需要为用户设备选择5G网关。此外，5G网关还可以根据位置更新时获得的签约信息确定用户签约了5G业务(即该用户为5G用户)，进而需要为用户设备选择5G网关。
可选的，SGSN也可以确定用户设备具有5G能力，且用户签约了5G业务，才执行为用户设备选择5G网关的步骤。
步骤506、SGSN为用户设备选择5G网关。
其中，步骤506的执行过程和上述实施例中的步骤206相同，详情参见上述实施例，在此不再重复。
步骤507、SGSN建立与5G网关之间的会话。
其中，SGSN和5G网关建立会话的步骤具体包括MME向5G网关发送创建PDP会话请求，该PDP会话请求中携带了上述PDU会话标识和PDP上下文标识的对应关系。此外，该请求中还可以携带SGSN从UDM中获得的5G签约信息，例如携带Interworking 5GS Indicator参数，表明该用户签约了5G业务。具体的，5G网关中的GGSN可以接收创建PDP会话请求，并将其中携带的PDU会话标识和PDP上下文标识的对应关系、5G签约信息等转发给SMF，从而SMF执行后续为用户分配5G参数的流程。
5G网关可以保存上述PDU会话标识和PDP上下文标识的对应关系。
步骤508、5G网关确定需要为用户分配5G网络参数。
其中，5G网关可以根据上述PDU会话标识和PDP上下文标识的对应关系确定UE具有5G能力，进而需要为用户分配5G网络参数。此外，5G网关还可以根据创建PDP会话请求中携带的5G签约信息确定用户签约了5G业务，进而需要为用户分配5G网络参数。
步骤509、5G网关为用户分配5G网络参数。
其中，5G网关可以为用户分配5G QoS rule、Qos流描述、业务流模板等参数，便于UE移动到5G网络后使用。
步骤510、5G网关通过创建会话响应向SGSN发送5G网络参数。
5G网关向SGSN返回创建PDP会话响应，该响应中可以携带UE在2/3G网络的参数，例如服务质量QoS，IP地址等。
在本实施例中，上述创建PDP会话响应中还携带5G网关为用户分配的5G网络参数。
步骤511、SGSN向UE发送激活PDP上下文接受消息，其中携带上述5G网络参数。
其中，SGSN可以通过激活PDP上下文接受消息向UE返回5G网关分配的5G网络参数。此外，该激活PDP上下文接受消息中还携带了2/3G网络的参数。
UE接收MME发送的激活PDP上下文接受消息，保存其中携带的2/3G网络参数和5G网络参数。UE可以在2/3G网络发起数据业务。随后，UE从2/3G网络移动到5G网络(移动过程可以经过4G网络也可以不经过4G网络)，UE可以继续与该5G网关通信。5G网关中还保存了上述PDU会话标识和PDP上下文标识的对应关系，从而5G网关可以直接找到UE在5G网络中使用的PDU会话，并对该PDU会话应用分配的5G网络参数，保持业务的连续。
参考图6，图6是本申请实施例提供的另一方法的流程图。
本实施例提供的实现业务连续的方法主要包括如下步骤：
步骤601、5G用户设备在5G网络接入，向5G核心网进行注册。
其中，注册流程包括对用户的鉴权、分配用户标识，例如分配全球唯一临时标识等。在UE完成注册后，UE发起PDU会话建立的流程。
注册流程中参与的设备包括UE、接入管理功能(access management function，AMF)设备、用户数据服务器等。
步骤602、UE向AMF设备发送PDU会话建立请求，请求建立PDU会话。
步骤603、AMF向5G网关发送创建会话管理SM上下文请求消息。
在本实施例中，AMF在接收到UE发送的PDU会话建立(establish)请求后，通过服务化接口向5G网关发送创建会话管理(session management，SM)上下文请求(CreateSMContext Request)，请求建立PDU会话。
在本实施例，5G网关可以为会话管理功能(session management function，SMF)设备，也可以为融合了GGSN、SGW、PGW和SMF各自功能的融合网关。本实施例中的5G网关还可以为融合了SMF、GGSN的控制面功能、SGW的控制面功能和PGW的控制面功能的设备。
步骤604、5G网关向用户数据服务器获取用户签约信息。
步骤605、5G网关对用户分配5G网络参数、与5G网络参数对应的2/3G和4G参数。
在本实施例中，用户签约了5G业务，则SMF获取到用户的签约信息之后，对用户分配5G网络参数，例如为用户分配5G QoS rule、Qos流描述、业务流模板等参数。此外，5G网关还对这些5G网络参数进行转换，转换成对应的2/3G和4G网络的参数。
步骤606、5G网关向AMF返回5G网络参数、与5G网络参数对应的2/3G和4G参数。
在本实施例中，5G网关可以通过N1N2message transfer消息向AMF发送为用户分配的2/3G、4G和5G网络参数。
步骤607、AMF向UE发送PDU会话建立接受消息，其中携带2/3G、4G和5G网络参数。
UE接收到上述PDU会话建立接受消息后，保存其中携带的2/3G、4G和5G网络参数，UE直接使用5G网络参数进行数据业务。
随后，UE从5G网络移动到2/3G或4G网络时，不需要重新向核心网设备(例如SGSN、MME等)获取网络参数，直接与融合5G网关通信，并使用预先保存的2/3G网络参数和4G网络参数进行数据业务，保持业务的连续。
参见图7，图7是本申请实施例提供的服务节点设备、5G网关和移动管理设备的示意图。
本实施例提供的服务节点设备、5G网关和移动管理设备均采用了通用的计算机硬件，包括处理器701、存储器702、总线703、输入设备704、输出设备705等。
具体的，存储器702可以包括以易失性和/或非易失性存储器形式的计算机存储媒体，如只读存储器和/或随机存取存储器。存储器702可以存储操作系统、应用程序、其他程序模块、可执行代码、程序数据、用户开户数据、用户订阅数据等。
输入设备704可以用于向服务节点设备输入命令和信息，输入设备704如键盘或指向设备，如鼠标、轨迹球、触摸板、麦克风、操纵杆、游戏垫、卫星电视天线、扫描仪或类似设备。这些输入设备可以通过总线703连接至处理器701。
输出设备705可以用于服务节点设备输出信息，除了显示器之外，输出设备705还可以为其他外围输出设各，如扬声器和/或打印设备，这些输出设备也可以通过总线703连接到处理器701。
服务节点设备可以通过网络接口706连接到网络中，例如连接到局域网(local area  network，LAN)。在联网环境下，服务节点设备中存储的计算机执行指令可以存储在远程存储设备中，而不限于在本地存储。
当服务节点设备中的处理器701执行存储器702中存储的可执行代码或应用程序时，服务节点设备可以执行以上实施例中的服务节点设备一侧的方法步骤，例如执行步骤203-204、206、303-304、307等。具体执行过程参见上述实施例，在此不再赘述。
当移动管理设备中的处理器701执行存储器702中存储的可执行代码或应用程序时，移动管理设备可以执行以上实施例中移动管理设备一侧的方法步骤，例如执行步骤210、213、310、312、416、418等。具体执行过程参见上述实施例，在此不再赘述。
当5G网关中的处理器701执行存储器702中存储的可执行代码或应用程序时，5G网关可以执行以上实施例中5G网关一侧的方法步骤，例如执行步骤207、307、311-312、411-412、508-509、605-606等。具体执行过程参见上述实施例，在此不再赘述。
参见图8，图8是本申请实施例提供的用户设备的示意图。
其中，用户设备主要包括处理器801、存储器802、总线803、输入设备804、输出设备805以及网络接口806。此外，用户设备还可以包括应用处理器(application processor，AP)，电池等部件。
具体的，存储器802可以包括以易失性和/或非易失性存储器形式的计算机存储媒体，如只读存储器和/或随机存取存储器。存储器802可以存储操作系统、应用程序、其他程序模块、可执行代码和程序数据。
输入设备804可以用于向用户设备输入命令和信息，输入设备804如键盘或指向设备，如鼠标、轨迹球、触摸板、麦克风、操纵杆、游戏垫、圆盆式卫星电视天线、扫描仪或类似设备。这些输入设备可以通过总线803连接至处理器801。
输出设备805可以用于用户设备输出信息，除了显示器之外，输出设备805还可以为其他外围输出设各，如扬声器，这些输出设备也可以通过总线803连接到处理器801。
用户设备可以通过网络接口806连接到网络中，例如通过无线接口连接到WIFI网络、5G网络、2/3G网络、4G网络等。在联网环境下，用户设备中存储的计算机执行指令可以存储在远程存储设备中，而不限于在本地存储。
当用户设备中的处理器801执行存储器802中存储的可执行代码或应用程序时，用户设备可以执行以上实施例中的用户设备一侧的方法步骤，例如执行步骤209、213、314、318、401、416、504、511等。具体执行过程和有益效果参见上述相关实施例，在此不再赘述。
参考图9，图9是本申请实施例提供的服务节点设备的示意图。
如图所示，服务节点设备主要包括确定模块901、选择模块902、会话建立模块903。
其中，确定模块901用于在用户设备附着2/3G网络时，确定所述用户设备具有5G能力或所述用户设备对应的用户为5G用户；
选择模块902用于为所述用户设备选择5G网关；
会话建立模块903用于建立与所述5G网关之间的会话。
本实施例提供的服务节点设备可以使用在前述实施例提供的实现业务连续的方法中，通过确定模块901、选择模块902以及会话建立模块903之间的配合实现用户设备的业务连续，解决了现有技术中用户设备从2/3G网络移动到5G网络带来的业务中断问题。
在本申请提供的服务节点设备中，确定模块901确定所述用户设备对应的用户为5G用户具体包括：
接收用户设备发送的附着请求，所述附着请求中携带用户标识；根据所述用户标识向用户数据服务器获取所述用户设备对应的用户的签约数据，然后根据所述签约数据确定所述用户为5G用户。
本申请提供的服务节点设备还包括接收模块904，用于接收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的5G能力。此时，确定模块901根据接收到的附着请求来确定用户设备具有5G能力。此外，接收模块904还用于接收用户设备发送的承载分配请求。
在本申请提供的服务节点设备还包括：
获取模块905，用于在接收到所述用户设备发送的承载分配请求后，向所述5G网关获取所述用户设备的5G网络参数；
发送模块906，用于通过承载分配响应向所述用户设备发送所述5G网络参数。从而用户设备可以接收承载分配响应，保存其中携带的5G网络参数，便于后续在移动到5G网络后直接使用这些5G参数。
在本申请提供的服务节点设备中，所述接收模块904还用于接收用户设备发送的激活上下文请求消息，所述激活上下文请求消息中携带协议数据单元PDU会话标识；
所述服务节点设备中的会话建立模块903建立与所述5G网关之间的会话包括：向所述5G网关发送创建PDP上下文请求消息，用于请求对所述用户设备创建PDP上下文，所述创建上下文请求消息中携带所述PDU会话标识；接收所述5G网关发送的创建PDP上下文响应消息，从而创建了服务节点设备和5G网关之间的会话。
其中，创建PDP上下文响应携带为所述用户设备分配的5G网络参数。服务节点设备中的发送模块906还用于向所述用户设备发送激活上下文响应消息，所述激活上下文响应消息中携带所述5G网络参数。
在本申请提供的服务节点设备中，所述选择模块902为所述用户设备选择5G网关包括：生成5G网关的全合格域名FQDN或者向域名系统或所述5G网关的全合格域名FQDN，使用所述FQDN请求所述域名系统地址解析获得5G网关的地址。
其中，上述实施例中的服务节点设备是以功能模块的形式来呈现的，这里的“模块”可以指特定应用集成电路，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。
在以上实施例提供的服务节点设备中，服务节点设备中的确定模块901、选择模块902等功能模块实现的功能都可以通过图7中的处理器701和存储器702来实现。例如，确定模块901确定所述用户设备具有5G能力或所述用户设备对应的用户为5G用户的功能可以通过由处理器701来执行存储器702中存储的代码来实现。选择模块902为所述用户设备选择5G网关的功能也可以通过由处理器701来执行存储器702中存储的代码来实现。
参考图10，图10是本申请实施例提供的5G网关的示意图。
如图所示，5G网关可以包括接收模块1001、参数分配模块1002以及发送模块1003。
其中，接收模块1001用于接收移动管理设备或服务节点设备发送的创建会话请求，所述创建会话请求中携带用户设备具有5G能力或用户签约5G业务的指示信息；
参数分配模块1002用于为所述用户分配5G网络参数；
发送模块1003用于向所述移动管理设备或所述服务节点设备发送所述分配的5G网络参数。
本实施例提供的5G网关设备可以使用在前述实施例提供的实现业务连续的方法中，通过接收模块1001、参数分配模块1002以及发送模块1003之间的配合实现用户设备的业务连续，解决了现有技术中用户设备从2/3G网络移动到5G网络带来的业务中断问题。
在本实施例提供的5G网关中，发送模块1003具体可以通过创建会话响应消息或更新承载请求消息向所述移动管理设备发送所述分配的5G网络参数。此外，发送模块1003还可以通过创建会话响应消息向服务节点设备发送所述分配的5G网络参数，便于服务节点设备或移动管理设备向用户设备转发5G网络参数，从而用户设备可以在移动到5G网络后使用。
在本实施例提供的5G网关中，接收模块1001还用于接收移动管理设备或所述服务节点设备发送的分组数据单元PDU会话标识和承载标识的对应关系。此时，5G网关还包括参数应用模块1003，用于根据所述对应关系确定所述用户设备对应的PDU会话，然后对所述PDU会话应用所述5G网络参数。
在本实施例提供的5G网关中，参数分配模块1002还用于为所述用户分配与所述5G网络参数对应的2/3G网络参数和4G网络参数。此时，5G网关中的发送模块1003还用于向所述移动管理设备或所述服务节点设备发送所述2/3G网络参数和所述4G网络参数。从而，用户设备可以保存2/3G网络参数、4G网络参数和5G网络参数，便于后续使用。
其中，上述实施例中的5G网关设备是以功能模块的形式来呈现的，这里的“模块”可以指特定应用集成电路，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。
在以上实施例提供的5G网关中，5G网关中的接收模块1001、参数分配模块1002等功能模块实现的功能都可以通过图7中的处理器701和存储器702来实现。例如，接收模块1001接收移动管理设备或服务节点设备发送的创建会话请求的功能可以通过由处理器701来执行存储器702中存储的代码来实现。参数分配模块1002为所述用户分配5G网络参数的功能也可以通过由处理器701来执行存储器702中存储的代码来实现。
参考图11，图11是本申请实施例提供的用户设备的示意图。
如图所示，用户设备可以包括发送模块1101以及接收模块1102。
其中，发送模块1101用于在用户设备接入2/3G网络时向服务节点设备发送激活PDP上下文请求消息以激活PDP上下文，所述激活PDP上下文请求消息中携带所述用户设备具有5G能力的指示信息。
接收模块1102用于接收所述服务节点设备发送的激活PDP上下文响应消息，所述激活PDP上下文请求消息中携带5G网络参数。从而，在用户设备后续移动到5G网络时，使用这些5G网络参数。
在本申请实施例中，用户设备中的发送模块1101还可以向移动管理设备发送跟踪区更新请求消息以进行跟踪区更新，所述跟踪区更新请求消息中携带所述用户设备具有5G能力的指示信息，随后用户设备中的接收模块1102还可以接收所述移动管理设备发送的跟踪区更新响应消息，所述跟踪区更新响应消息中携带5G网络参数。
在本申请实施例中，接收模块1102接收到的跟踪区更新响应消息中还携带与所述5G网络参数对应的2/3G网络参数和4G网络参数。
在本申请实施例中，用户设备中的发送模块1101还可以向移动管理设备发送承载资源分配请求消息以请求分配承载资源，所述承载资源分配请求消息中携带所述用户设备具有5G能力的指示信息，随后用户设备中的接收模块1102接收所述移动管理设备发送的承载资源分配响应消息，所述承载资源分配响应消息中携带5G网络参数。
在本申请实施例中，接收模块1102接收到的承载资源分配响应消息中还携带与所述5G网络参数对应的2/3G网络参数和4G网络参数。
在本申请实施例中，用户设备中的发送模块1101还可以向移动管理设备发送激活PDP上下文请求，所述激活PDP上下文请求中携带所述用户设备具有5G能力的指示信息，随后用户设备中的接收模块1102接收所述移动管理设备发送的激活PDP上下文响应，所述激活PDP上下文响应中携带5G网络参数。
在本申请实施例中，用户设备中的接收模块1102接收到的激活PDP上下文响应消息中还携带与所述5G网络参数对应的2/3G网络参数和4G网络参数。
在本申请实施例中，用户设备中的接收模块1102还可以接收移动管理设备发送的修改承载上下文请求消息，所述修改承载上下文请求消息中携带5G网络参数；然后，用户设备中的存储模块1103可以保存所述5G网络参数，并在随后移动到5G网络时，直接使用该5G网络参数，保持业务连续。
在本申请实施例中，用户设备中的发送模块1101还可以向所述移动管理实体发送修改承载上下文接受消息，所述修改承载上下文接受消息中携带PDU会话的标识和EPS承载标识之间的对应关系中。
在本申请实施例中，上述用户设备具有5G能力的指示信息为PDU会话的标识、所述PDU会话的标识和EPS承载标识之间的对应关系、所述PDU会话的标识和PDP上下文标识之间的对应关系中的至少一种。
在本申请实施例中，用户设备中的发送模块1101还可以向AMF发送PDU会话建立请求，用于建立PDU会话；
所述用户设备中的接收模块1102还接收所述AMF发送的PDU会话建立完成消息，所述PDU会话建立完成消息中携带5G网络参数以及所述5G网络参数对应的2/3G网络参数和4G网络参数。
其中，用户设备中的存储模块1103可以保存该2/3G网络参数和4G网络参数，并在随后移动到2/3G网络或4G网络时，直接使用2/3G网络参数和4G网络参数，不需要向核 心网设备获取这些参数，进一步提高了业务的连续性。
在以上实施例提供的用户设备中，发送模块1101和接收模块1102等功能模块实现的功能都可以通过图8中的处理器801和存储器802来实现。例如，接收模块1102接收AMF发送的PDU会话建立完成消息的功能可以通过由处理器801来执行存储器802中存储的代码来实现。发送模块1101向AMF发送PDU会话建立请求的功能也可以通过由处理器801来执行存储器802中存储的代码来实现。
以上所述，仅为本申请示例性的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到的变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应该以权利要求的保护范围为准。

Claims (20)

  1. 一种实现业务连续的方法，其特征在于，包括：
    服务节点设备在用户设备附着2/3G网络时，确定所述用户设备具有5G能力或所述用户设备对应的用户为5G用户；
    所述服务节点设备为所述用户设备选择5G网关，并建立与所述5G网关之间的会话。
  2. 如权利要求1所述的方法，其特征在于，所述服务节点设备确定所述用户设备对应的用户为5G用户包括：
    所述服务节点设备接收用户设备发送的附着请求，所述附着请求中携带用户标识；
    所述服务节点设备根据所述用户标识向用户数据服务器获取所述用户设备对应的用户的签约数据；
    所述服务节点设备根据所述签约数据确定所述用户为5G用户。
  3. 如权利要求1所述的方法，其特征在于，所述服务节点设备接收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的5G能力。
  4. 如权利要求1所述的方法，其特征在于，所述服务节点设备建立与所述5G网关之间的会话包括：
    所述服务节点设备向所述5G网关发送创建分组数据协议PDP会话请求，接收所述5G网关返回的创建PDP会话响应。
  5. 如权利要求2或3所述的方法，其特征在于，还包括：
    移动管理设备在接收到所述用户设备发送的跟踪区更新请求后，向所述5G网关获取所述用户设备对应的用户的5G网络参数；
    所述移动管理设备通过跟踪区更新响应向所述用户设备发送所述5G网络参数。
  6. 如权利要求5所述的方法，其特征在于，还包括：
    所述跟踪区更新请求中还携带分组数据单元PDU会话标识和承载标识的对应关系；
    所述移动管理设备通过创建会话请求消息向所述5G网关发送所述PDU会话标识和承载标识的对应关系；
    所述移动管理设备接收所述5G网关发送的创建会话响应消息，其中携带所述5G网络参数。
  7. 如权利要求2或3所述的方法，其特征在于，还包括：
    所述服务节点设备在接收到所述用户设备发送的承载分配请求后，向所述5G网关获取所述用户设备对应的用户的5G网络参数；
    所述服务节点设备通过承载分配响应向所述用户设备发送所述5G网络参数。
  8. 如权利要求7所述的方法，其特征在于，还包括：
    所述承载分配请求中还携带分组数据单元PDU会话标识和承载标识的对应关系；
    所述移动管理设备通过承载资源请求向所述5G网关发送所述PDU会话标识和承载标识的对应关系；
    所述移动管理设备接收所述5G网关发送的承载资源响应，其中携带所述5G网络参数。
  9. 如权利要求2或3所述的方法，其特征在于，还包括：
    移动管理设备接收所述5G网关发送的所述用户的5G网络参数；
    所述移动管理设备向所述用户设备发送所述5G网络参数。
  10. 如权利要求9所述的方法，其特征在于，还包括：
    所述移动管理设备接收所述用户设备发送的承载修改请求，其中携带分组数据单元PDU会话标识和承载标识的对应关系；
    所述移动管理设备向所述5G网关发送所述PDU会话标识和承载标识的对应关系。
  11. 如权利要求2或3所述的方法，其特征在于，还包括：
    所述服务节点设备接收所述用户设备发送的激活上下文请求消息，所述激活上下文请求消息中携带协议数据单元PDU会话标识；
    所述服务节点设备建立与所述5G网关之间的会话包括：
    所述服务节点设备向所述5G网关发送创建分组数据协议PDP上下文请求消息，用于请求对所述用户设备创建PDP上下文，所述创建上下文请求消息中携带所述PDU会话标识；
    所述服务节点设备接收所述5G网关发送的创建PDP上下文响应消息。
  12. 如权利要求1所述的方法，其特征在于，所述服务节点设备为所述用户设备选择5G网关包括：
    所述服务节点设备生成5G网关的全合格域名FQDN或向域名系统获取所述5G网关的全合格域名FQDN；
    使用所述FQDN请求所述域名系统进行地址解析获得所述5G网关的地址。
  13. 一种实现业务连续的方法，其特征在于，包括：
    5G网关接收移动管理设备或服务节点设备发送的创建会话请求，所述创建会话请求中携带用户设备具有5G能力或用户签约5G业务的指示信息；
    所述5G网关为所述用户分配5G网络参数；
    所述5G网关向所述移动管理设备或所述服务节点设备发送所述分配的5G网络参数。
  14. 如权利要求13所述的方法，其特征在于，
    所述5G网关通过创建会话响应消息或更新承载请求消息向所述移动管理设备发送所述分配的5G网络参数。
  15. 如权利要求13所述的方法，其特征在于，还包括：
    所述5G网关接收移动管理设备或所述服务节点设备发送的分组数据单元PDU会话标识和承载标识的对应关系；
    所述5G网关根据所述对应关系确定所述用户设备对应的PDU会话；
    所述5G网关对所述PDU会话应用所述5G网络参数。
  16. 如权利要求14所述的方法，其特征在于，还包括：
    所述5G网关为所述用户分配与所述5G网络参数对应的2/3G网络参数和4G网络参数；
    所述5G网关还向所述移动管理设备或所述服务节点设备发送所述2/3G网络参数和所述4G网络参数。
  17. 一种服务节点设备，其特征在于，包括：
    相互耦合的非易失性存储器和处理器，所述处理器调用存储在所述存储器中的程序代码，以使得所述服务节点设备执行如权利要求1-7或11-12任一项所述的方法。
  18. 一种5G网关，其特征在于，包括：
    相互耦合的非易失性存储器和处理器，所述处理器调用存储在所述存储器中的程序代码，以使得所述5G网关执行如权利要求13-16任一项所述的方法。
  19. 一种通信系统，其特征在于，包括：
    服务节点设备和5G网关，所述服务节点设备配置于：
    在用户设备附着2/3G网络时，确定所述用户设备具有5G能力或所述用户设备对应的用户为5G用户；
    所述服务节点设备为所述用户设备选择5G网关，并建立与所述5G网关之间的会话；
    所述5G网关配置于和所述服务节点设备建立会话。
  20. 如权利要求19所述的通信系统，其特征在于，所述5G网关进一步配置于接收移动管理设备或服务节点设备发送的创建会话请求，所述创建会话请求中携带所述用户设备具有5G能力或所述用户为5G用户的指示信息；
    所述5G网关为所述用户分配5G网络参数；
    所述5G网关向所述移动管理设备或所述服务节点设备发送所述分配的5G网络参数。
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