WO2022199451A1 - Procédé et appareil de commutation de session - Google Patents

Procédé et appareil de commutation de session Download PDF

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Publication number
WO2022199451A1
WO2022199451A1 PCT/CN2022/081363 CN2022081363W WO2022199451A1 WO 2022199451 A1 WO2022199451 A1 WO 2022199451A1 CN 2022081363 W CN2022081363 W CN 2022081363W WO 2022199451 A1 WO2022199451 A1 WO 2022199451A1
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WO
WIPO (PCT)
Prior art keywords
session
access technology
terminal device
network
network element
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PCT/CN2022/081363
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English (en)
Chinese (zh)
Inventor
徐艺珊
诸华林
朱浩仁
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华为技术有限公司
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Publication of WO2022199451A1 publication Critical patent/WO2022199451A1/fr

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    • 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
    • H04W36/0019—Control or signalling for completing the hand-off for data sessions of end-to-end connection adapted for mobile IP [MIP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H04W36/142—Reselecting a network or an air interface over the same radio air interface technology
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/13—Cell handover without a predetermined boundary, e.g. virtual cells

Definitions

  • the present application relates to the field of communication technologies, and more particularly, to a method and apparatus for session switching.
  • a terminal device establishes a session after accessing the network, and accesses an external data network through the session to interact with the application server deployed in the data network.
  • session handover may occur, such as session handover between a 3rd generation partnership project (3GPP) access technology and a non-3GPP access technology.
  • 3GPP 3rd generation partnership project
  • WLAN wireless local access network
  • N5CW Non-5G-Capable over WLAN
  • the present application provides a method and apparatus for session switching, which can enable a session of a terminal device to switch between different access technologies, such as switching between a 3GPP access technology and a non-3GPP access technology.
  • a method for session switching is provided, which can be executed by a network device, or can also be executed by a chip or circuit used for a network device, which is not limited in this application.
  • a network device or can also be executed by a chip or circuit used for a network device, which is not limited in this application.
  • the following uses The implementation of the network device is taken as an example for description.
  • the method may include: the network device receives first indication information from the terminal device, where the first indication information is used to instruct to switch a session of the terminal device, and the session is a session established by using the first access technology; the network device determines that the terminal device has passed the first access technology An access technology or a terminal device that does not support non-access stratum NAS signaling when accessing the core network through a second access technology; the network device performs session handover from the first access technology to the second access technology.
  • the network device may be a core network element, such as an access and mobility management function (AMF) network element, or a session management function (SMF) network element Yuan.
  • AMF access and mobility management function
  • SMS session management function
  • the network device determines, according to one or more of the following information, whether the terminal device is not connected to the core network through the first access technology or through the second access technology: Terminal equipment supporting NAS signaling: the identity of the terminal equipment, the identity of the first session, and the identity of the first access network device; the first access network device is the access corresponding to the first access technology or the second access technology network equipment.
  • the first access network device is an access network device corresponding to the first access technology.
  • the first access network device is an access network device corresponding to the second access technology.
  • the first access technology is a non-3rd Generation Partnership Project N3GPP access technology
  • the second access technology is a 3GPP access technology
  • the network device determines that the terminal device is a terminal device that does not support NAS signaling when accessing the core network through the first access technology, including: The identification information is to obtain the context information of the terminal device; the network device determines, according to the first identification information of the session in the context information, that the terminal device is a terminal device that does not support NAS signaling when accessing the core network through the first access technology.
  • the first identifier of the session in the context information of the terminal device is a special value or a fixed value (eg, 15).
  • the network device can search for the context information of the terminal device (such as session context information) according to the identity of the terminal device, and according to the first identity of the session in the context information of the terminal device (such as a special value or a fixed value) , determining that the terminal device is a terminal device that does not support NAS signaling when accessing the core network through the first access technology.
  • the context information of the terminal device such as session context information
  • the first identity of the session in the context information of the terminal device such as a special value or a fixed value
  • the network device determines that the terminal device is a terminal device that does not support NAS signaling when accessing the core network through the first access technology, including: identification information, to determine the identification information of the access network device, the access network device is the access network device corresponding to the first access technology; the network device determines that the terminal device has passed the first access technology according to the identification information of the access network device Terminal equipment that does not support NAS signaling when accessing the core network.
  • the network device can determine, according to the identification of the access network device, that the terminal device is a terminal device that does not support NAS signaling when accessing the core network through the first access technology.
  • the access network device includes a trusted wireless local area network interoperability function TWIF network element.
  • the method further includes: the network device receives second indication information from the terminal device, where the second indication information is used to indicate that the terminal device uses the first access technology or the A terminal device that does not support NAS signaling when the second access technology accesses the core network; the network device determines that the terminal device is a terminal device that does not support NAS signaling when accessing the core network through the first access technology, including: the network device according to In the second indication information, it is determined that the terminal device is a terminal device that does not support NAS signaling when accessing the core network through the first access technology.
  • the network device can determine, according to the instruction of the terminal device, that the terminal device is a terminal device that does not support NAS signaling when accessing the core network through the first access technology or through the second access technology.
  • the network device receiving the first indication information from the terminal device includes: the network device receives a request message sent by the terminal device through the second access technology, where the request message is used for requesting to establish a session through the second access technology, and the request message includes the first indication information and the second identification information of the session; the method further includes: the network device determines, according to the second identification information of the session, that it needs to determine that the terminal device is through the first access Terminal equipment that does not support NAS signaling when the technology accesses the core network.
  • the second identifier of the session can be used by the network device to determine that the terminal device needs to be determined as a terminal device that does not support NAS signaling when accessing the core network through the first access technology.
  • the second identification information of the session includes: a null value or an identification generated by a terminal device.
  • the session ID can be modified or added, so that the terminal device is not required to know the session ID under another access technology in advance, that is, in the session request message sent by the terminal device, whether the session ID is empty or Whether it is a new identity or an original identity, the network device can implement session switching.
  • the network device is a first core network element
  • the method further includes: the first core network element sends the second identification information of the session to the second core network element and third indication information, where the third indication information is used to associate the first identification information and the second identification information of the session.
  • the network element of the first core network is an AMF network element
  • the network element of the second core network is an SMF network element
  • the association manner may be to replace the first identifier of the session with the second identifier of the session; or may be to add the second identifier of the session, that is, the session may be associated with multiple session identifiers, which is not limited.
  • the first indication information includes: the session is an existing session.
  • the first indication information is a request type
  • the request type indicates that the session is an existing session.
  • the first identification information of the session is the session identification when the session is established through the first access technology.
  • a method for session switching is provided.
  • the method can be executed by a terminal device, or can also be executed by a chip or circuit used in the terminal device, which is not limited in this application.
  • a terminal equipment is used as an example for description.
  • the method may include: the terminal device establishes a session by using the first access technology; the terminal device sends first indication information to the network device, where the first indication information is used to instruct the session to be switched; wherein, the terminal device uses the first access technology or the For a terminal device that does not support non-access stratum NAS signaling when the second access technology accesses the core network, the session is switched from the first access technology to the second access technology.
  • the terminal device may provide indication information to the network side to inform the core network that the terminal device requests to execute the session switching process. Based on the indication of the terminal device, the network side can clearly know that the terminal device wants to request a session switch.
  • the method further includes: the terminal device sends second indication information to the network device, where the second indication information is used to indicate that the terminal device uses the first access technology or the third 2.
  • the terminal device that does not support NAS signaling when the access technology accesses the core network.
  • the terminal device is a terminal device that does not support NAS signaling when accessing the core network through the first access technology, and the first indication information includes: the session is an existing session .
  • the method further includes: the terminal device sends the first identification information of the session or the second identification information of the session to the network device.
  • the first identification information of the session is the session identification when the session is established through the first access technology
  • the second identification information of the session includes: a null value or a terminal device generated 's identification.
  • the terminal device is a terminal device that does not support NAS signaling when accessing the core network through the first access technology
  • the method further includes: The first identification information of the session is received, and the access network device is an access network device corresponding to the first access technology.
  • the terminal device sending the first indication information to the network device includes: the terminal device sends a request message to the network device through the second access technology, where the request message is used to request the The second access technology establishes a session, and the request message includes the first indication information.
  • a method for session switching is provided, which can be executed by a network device, or can also be executed by a chip or circuit used for a network device, which is not limited in this application.
  • a network device or can also be executed by a chip or circuit used for a network device, which is not limited in this application.
  • the following uses The implementation of the network device is taken as an example for description.
  • the method may include: the network device receives indication information and/or first identification information of the session from the terminal device, the indication information is used to instruct to switch the session of the terminal device, the session is a session established through the first access technology, and the terminal device is For terminal equipment that does not support non-access stratum NAS signaling when accessing the core network through the second access technology, the first identification information of the session includes the session identification when the session was established through the first access technology; /or the first identification information of the session, to determine to switch the session from the first access technology to the second access technology.
  • the network device may be a trusted wireless local access network (wireless local access network, WLAN) interworking function (trusted WLAN interworking function, TWIF) network element.
  • WLAN wireless local access network
  • TWIF trusted WLAN interworking function
  • a network device eg, a TWIF network element
  • the method further includes: the network device sends the request type, and the first identification information of the session and/or the second identification information of the session to the core network element, wherein, The request type is used to indicate session switching, and the second identification information of the session includes the session identification when the session is established through the second access technology.
  • the core network element is, for example, an AMF network element or an SMF network element.
  • the network device receives the indication information and/or the first identification information of the session from the terminal device, including: the network device receives a request message from the terminal device, in the request message Including indication information and/or first identification information of the session.
  • the network device is a trusted wireless local area network interoperability function TWIF network element.
  • the first access technology is a 3rd Generation Partnership Project 3GPP access technology
  • the second access technology is a non-3rd Generation Partnership Project N3GPP access technology .
  • a method for session switching is provided, which can be executed by a terminal device, or can also be executed by a chip or circuit used in the terminal device, which is not limited in this application.
  • a terminal device or can also be executed by a chip or circuit used in the terminal device, which is not limited in this application.
  • the following uses The terminal equipment is used as an example for description.
  • the method may include: the terminal device establishes a session by using the first access technology; the terminal device sends indication information and/or first identification information of the session to the network device, where the indication information is used to instruct to switch the session of the terminal device, and the session is performed through the first access technology.
  • the terminal device is a terminal device that does not support non-access stratum NAS signaling when accessing the core network through the second access technology, and the first identification information of the session includes when the session is established through the first access technology. session ID.
  • the network device may be, for example, a trusted wireless local area network interoperability function (TWIF) network element.
  • TWIF trusted wireless local area network interoperability function
  • the terminal device sends a request message to the network device, where the request message includes indication information and/or first identification information of the session.
  • a method for session switching is provided, and the method can be executed by a network device, or can also be executed by a chip or circuit used for a network device, which is not limited in this application.
  • the implementation of the network device is taken as an example for description.
  • the method may include: the network device receives a request message for requesting to establish a second session for the terminal device through the second access technology; the network device determines whether the terminal device is connected through the first access technology or through the second access technology A terminal device that does not support non-access stratum NAS signaling when entering the core network; the network device determines that the first parameter of the first session established through the first access technology is the same as the second parameter of the second session; The session switches to the second session.
  • the network device may be a core network element, such as an SMF network element or an AMF network element.
  • the network device switches the first session to the second session, it means that the session is switched from the first access technology to the second access technology.
  • the first session established; after the handover, the session is the second session established by the terminal device through the second access technology.
  • it may also indicate that the session identifier of the session has changed before and after the switch.
  • the network device when the network device determines that the terminal device is a terminal device that does not support NAS signaling when accessing the core network through the first access technology or through the second access technology, the network device may determine that the first access technology establishes The parameters of the session established by the second access technology are the same as or similar to the parameters of the session established through the second access technology, etc., it is determined to perform the handover.
  • the parameters of the session may include, for example, one or more of the following information: data network name, connection status of the terminal device, slice information, subscription data information of the terminal device , session policy information.
  • the terminal device refers to the terminal device to which the session belongs.
  • the network device by judging whether the above parameters of the first session established by the first access technology are consistent with or similar to the above parameters of the second session, it can be used by the network device to determine whether it is a handover of an existing session.
  • the network device determines that the terminal device is a terminal device that does not support NAS signaling when accessing the core network through the first access technology or through the second access technology, including : The network device determines, according to one or more of the following information, that the terminal device is a terminal device that does not support NAS signaling when accessing the core network through the first access technology or through the second access technology: a second indication from the terminal device information, the identification information of the terminal device, the identification information of the session, and the identification information of the access network device; the access network device is the access network device corresponding to the first access technology or the second access technology, and the second indication information is used for Indicates that the terminal device is a terminal device that does not support NAS signaling when accessing the core network through the first access technology or through the second access technology.
  • the first access technology is a non-3rd Generation Partnership Project N3GPP access technology
  • the second access technology is a 3GPP access technology
  • the network device determines that the terminal device is a terminal device that does not support NAS signaling when accessing the core network through the first access technology, including: The identification information is used to obtain the context information of the terminal device; the network device determines, according to the information of the first session in the context information, that the terminal device is a terminal device that does not support NAS signaling when accessing the core network through the first access technology.
  • the network device determines that the terminal device is a terminal device that does not support NAS signaling when accessing the core network through the first access technology, including: identification information, to determine the identification information of the access network device, the access network device is the access network device corresponding to the first access technology; the network device determines that the terminal device has passed the first access technology according to the identification information of the access network device Terminal equipment that does not support NAS signaling when accessing the core network.
  • the network device receiving the request message includes: the network device receiving the request message from the terminal device.
  • the first access technology is a 3GPP access technology
  • the second access technology is an N3GPP access technology
  • the network device determines that the terminal device is a terminal device that does not support NAS signaling when accessing the core network through the second access technology, including: The identification information is to obtain the context information of the terminal device; the network device determines, according to the identification information of the second session in the context information, that the terminal device is a terminal device that does not support NAS signaling when accessing the core network through the second access technology.
  • the network device determines that the terminal device is a terminal device that does not support NAS signaling when accessing the core network through the second access technology, including: the network device according to the identification of the terminal device. information, determine the identification information of the access network device, the access network device is the access network device corresponding to the second access technology; the network device determines, according to the identification information of the access network device, that the terminal device is connected through the second access technology Terminal equipment that does not support NAS signaling when entering the core network.
  • the network device receiving the request message includes: the network device receiving the request message from the trusted wireless local area network interoperability function TWIF network element.
  • the access network device includes a trusted wireless local area network interoperability function TWIF network element.
  • the network device is a first core network element
  • the method further includes: the first core network element sends the second identification information of the session to the second core network element and third indication information, where the third indication information is used to associate the first identification information and the second identification information of the session.
  • the network device is a first core network element
  • the method further includes: the first core network element sends a session context identifier and a fourth core network element to the second core network element Indication information, the fourth indication information is used to instruct to perform session switching.
  • the method further includes: the first core network element receives a context creation request from the second core network element information.
  • the network element of the first core network is an SMF network element
  • the network element of the second core network is an AMF network element
  • the method further includes: the first core network element Second identification information of the session from the second core network element is received.
  • a sixth aspect provides an apparatus for session switching, where the apparatus is configured to execute the methods provided in the first to fifth aspects above.
  • the apparatus may include units and/or modules for performing the methods provided in the first to fifth aspects, such as a processing unit and/or a communication unit.
  • the apparatus is a network device.
  • the communication unit may be a transceiver, or an input/output interface;
  • the processing unit may be a processor.
  • the apparatus is a chip, a system of chips, or a circuit used in a network device.
  • the communication unit may be an input/output interface, interface circuit, output circuit, input circuit, pin or Related circuits, etc.;
  • the processing unit may be a processor, a processing circuit, a logic circuit, or the like.
  • the apparatus is a terminal device.
  • the communication unit may be a transceiver, or an input/output interface;
  • the processing unit may be a processor.
  • the apparatus is a chip, a chip system or a circuit used in a terminal device.
  • the communication unit may be an input/output interface, interface circuit, output circuit, input circuit, pin or Related circuits, etc.;
  • the processing unit may be a processor, a processing circuit, a logic circuit, or the like.
  • the above-mentioned transceiver may be a transceiver circuit.
  • the above-mentioned input/output interface may be an input/output circuit.
  • a communication device comprising: a memory for storing a program; a processor for executing a program stored in the memory, and when the program stored in the memory is executed, the processor is used for executing the above-mentioned first aspect to The method provided by the fifth aspect.
  • the apparatus is a terminal device or a network device.
  • the apparatus is a chip, a chip system or a circuit used in terminal equipment or network equipment.
  • the present application provides a processor for executing the methods provided by the above aspects.
  • the process of sending the above-mentioned information and obtaining/receiving the above-mentioned information in the above-mentioned methods can be understood as the process of outputting the above-mentioned information by the processor and the process of receiving the above-mentioned input information by the processor.
  • the processor When outputting the above-mentioned information, the processor outputs the above-mentioned information to the transceiver for transmission by the transceiver. After the above-mentioned information is output by the processor, other processing may be required before reaching the transceiver.
  • the transceiver obtains/receives the above-mentioned information, and inputs it into the processor. Furthermore, after the transceiver receives the above-mentioned information, the above-mentioned information may need to perform other processing before being input to the processor.
  • receiving the indication information from the terminal device mentioned in the foregoing method can be understood as the processor receiving the input information.
  • the above-mentioned processor may be a processor specially used to execute these methods, or may be a processor that executes computer instructions in a memory to execute these methods, such as a general-purpose processor.
  • the above-mentioned memory can be a non-transitory (non-transitory) memory, such as a read-only memory (Read Only Memory, ROM), which can be integrated with the processor on the same chip, or can be set on different chips respectively.
  • ROM read-only memory
  • the embodiment does not limit the type of the memory and the setting manner of the memory and the processor.
  • a computer-readable storage medium stores program codes for device execution, the program codes including methods for executing the above-mentioned first to fifth aspects.
  • a tenth aspect provides a computer program product comprising instructions, which, when the computer program product runs on a computer, causes the computer to execute the methods provided in the first to fifth aspects above.
  • An eleventh aspect provides a chip, the chip includes a processor and a communication interface, the processor reads an instruction stored in a memory through the communication interface, and executes the methods provided in the first to fifth aspects above.
  • the chip may further include a memory, in which instructions are stored, the processor is configured to execute the instructions stored in the memory, and when the instructions are executed , the processor is configured to execute the methods provided by the first aspect to the fifth aspect.
  • a twelfth aspect provides a communication system, including the network device in the first aspect or the fifth aspect and a core network device for communicating with the network device, such as an AMF network element and an SMF network element; or, It includes the network device in the second aspect above and core network devices for communicating with the network device, such as a TWIF network element and an AMF network element; or, includes the network device and terminal device in any one of the above aspects.
  • FIG. 1 shows a schematic diagram of a network architecture suitable for this embodiment of the present application.
  • FIG. 2 shows another schematic diagram of a network architecture suitable for this embodiment of the present application.
  • FIG. 3 shows a schematic flowchart of a UE's session handover from non-3GPP to 3GPP.
  • FIG. 4 shows a schematic diagram of a method 400 for session switching provided by an embodiment of the present application.
  • FIG. 5 shows a schematic diagram of a method 500 for session switching provided by an embodiment of the present application.
  • FIG. 6 shows a schematic flow chart of session switching applicable to an embodiment of the present application.
  • FIG. 7 shows another schematic flowchart of session switching applicable to an embodiment of the present application.
  • FIG. 8 shows a schematic flow chart of session switching applicable to another embodiment of the present application.
  • FIG. 9 shows a schematic flow chart of session switching applicable to another embodiment of the present application.
  • FIG. 10 shows a schematic flow chart of session switching suitable for still another embodiment of the present application.
  • FIG. 11 is another schematic flowchart of session switching applicable to another embodiment of the present application.
  • Figure 12 shows a possible schematic flow chart of N5CW device registering to access 5GC and session establishment.
  • FIG. 13 shows a possible schematic flowchart of terminal device registration.
  • Figure 14 shows a possible schematic flow chart of a terminal device session establishment.
  • FIG. 15 shows a schematic block diagram of an apparatus for session switching provided according to an embodiment of the present application.
  • FIG. 16 shows another schematic block diagram of an apparatus for session switching provided according to an embodiment of the present application.
  • FIG. 17 shows a schematic structural diagram of a terminal device provided by an embodiment of the present application.
  • FIG. 18 shows a schematic structural diagram of a chip provided by an embodiment of the present application.
  • the technical solutions of the embodiments of the present application can be applied to various communication systems, for example, fifth generation (5th generation, 5G) systems or new radio (NR), long term evolution (LTE) systems, LTE frequency Division duplex (frequency division duplex, FDD) system, LTE time division duplex (time division duplex, TDD) and so on.
  • LTE long term evolution
  • LTE frequency Division duplex frequency division duplex
  • FDD frequency division duplex
  • TDD time division duplex
  • the technical solutions provided in this application can also be applied to future communication systems, such as the sixth generation mobile communication system.
  • the technical solutions of the embodiments of the present application can also be applied to device to device (D2D) communication, vehicle-to-everything (V2X) communication, machine to machine (M2M) communication, machine Machine type communication (MTC), and Internet of things (IoT) communication systems or other communication systems.
  • D2D device to device
  • V2X vehicle-to-everything
  • M2M machine to machine
  • MTC machine
  • FIG. 1 and FIG. 2 To facilitate understanding of the embodiments of the present application, a communication system applicable to the embodiments of the present application is first described in detail with reference to FIG. 1 and FIG. 2 .
  • FIG. 1 shows a schematic diagram of a network architecture suitable for this embodiment of the present application.
  • the network architecture may include, but is not limited to, the following: network elements based on a network slice specific authentication and authorization function (NSSAAF), a network slice selection function (NSSF) ) network element, authentication server function (AUSF) network element, unified data management (UDM) network element, access and mobility management function (AMF) network element, Session management function (session management function, SMF) network element, policy control function (policy control function, PCF) network element, application function (application function, AF), user equipment (user equipment, UE), access network (access network) , AN), user plane function (UPF) network element, data network (DN), etc.
  • NSSAAF network slice specific authentication and authorization function
  • NSSF network slice selection function
  • AUSF authentication server function
  • UDM unified data management
  • AMF access and mobility management function
  • Session management function Session management function (session management function, SMF) network element
  • Each network element shown in FIG. 1 is briefly introduced below.
  • Terminal equipment can be called user equipment (UE), access terminal, subscriber unit, subscriber station, mobile station, mobile station (MS), mobile terminal (MT), remote station , remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user equipment.
  • the terminal device may be a device that provides voice/data connectivity to the user, such as a handheld device with a wireless connection function, a vehicle-mounted device, and the like.
  • terminals can be: mobile phone (mobile phone), tablet computer (pad), computer with wireless transceiver function (such as notebook computer, palmtop computer, etc.), mobile internet device (mobile internet device, MID), virtual reality (virtual reality, VR) equipment, augmented reality (augmented reality, AR) equipment, wireless terminals in industrial control (industrial control), wireless terminals in unmanned driving (self driving), wireless terminals in remote medical (remote medical) Terminal, wireless terminal in smart grid, wireless terminal in transportation safety, wireless terminal in smart city, wireless terminal in smart home, cellular phone, cordless Telephone, session initiation protocol (SIP) telephone, wireless local loop (WLL) station, personal digital assistant (PDA), handheld device, computing device or connection with wireless communication capabilities
  • Other processing equipment to wireless modems in-vehicle equipment, wearable equipment, terminal equipment in 5G networks or terminal equipment in the future evolved public land mobile network (PLMN), etc.
  • PLMN public land mobile network
  • the terminal device may also be a terminal device in an Internet of things (Internet of things, IoT) system.
  • IoT Internet of things
  • IoT is an important part of the development of information technology in the future. Its main technical feature is to connect items to the network through communication technology, so as to realize the intelligent network of human-machine interconnection and interconnection of things.
  • IoT technology can achieve massive connections, deep coverage, and terminal power saving through, for example, narrow band (NB) technology.
  • NB narrow band
  • terminal equipment can also include sensors such as smart printers, train detectors, and gas stations.
  • the main functions include collecting data (part of terminal equipment), receiving control information and downlink data of network equipment, and sending electromagnetic waves to transmit uplink data to network equipment. .
  • the terminal device may be any device that can access the network.
  • a certain air interface technology can be used to communicate with each other between the terminal device and the access network device.
  • the UE can be used to act as a base station.
  • a UE may act as a scheduling entity that provides sidelink signals between UEs in V2X or D2D or the like.
  • UEs in V2X or D2D or the like.
  • cell phones and automobiles communicate with each other using sidelink signals. Communication between cell phones and smart home devices without relaying communication signals through base stations.
  • Access network The access network can provide network access functions for authorized users in a specific area.
  • the terminal equipment can access the core network by using access networks of different access technologies, for example, using non-3GPP technologies and 3GPP technologies to access the core network.
  • the access technology may include, for example, NR, Evolved Universal Mobile Telecommunication System (UMTS) Terrestrial Radio Access Network (UMTS Terrestrial Radio Access Network, E-UTRAN), Multefire, 3GPP access technology, non-3GPP access technology, 4G cellular access technology, 5G cellular access technology, trusted or untrusted wireless fidelity (WiFi) access technology, fixed network or wired access technology, etc. This is not limited.
  • the access network using non-3GPP technology may include but not limited to: WiFi network, WLAN, MulteFire network, wired network (for example: wireless and wireline convergence (WWC) network), or home base station network.
  • the access network equipment using non-3GPP technology may include, for example: an access point (access point, AP), a trusted WLAN interworking function (trusted WLAN interworking function, TWIF) network element, a trusted non-3GPP gateway function ( trusted non-3GPP gateway function, TNGF), wireline access gateway function (W-AGF), access gateway function (AGF), broadband network gateway (BNG), fixed Mobile interworking function (fixed-mobile interworking function, FMIF), non-3GPP interworking function (Non-3GPP interworking function, N3IWF), etc.
  • An access network using 3GPP technology may include, but is not limited to, an LTE network, an NR network, a 5G network, or a subsequently evolved mobile communication network.
  • the access network equipment using the 3GPP technology may include, for example, a radio access network (radio access network, RAN) equipment, g-NodeB, e-NodeB, and home-NodeB.
  • RAN radio access network
  • An access network that implements an access network function based on a wireless communication technology may be referred to as a RAN.
  • the radio access network can be responsible for functions such as radio resource management, quality of service (QoS) management, data compression and encryption on the air interface side.
  • QoS quality of service
  • the wireless access network provides access services for terminal equipment, and then completes the forwarding of control signals and user data between the terminal and the core network.
  • Radio access network devices may include, for example, but are not limited to: macro base station, micro base station (also called small cell), radio network controller (radio network controller, RNC), Node B (Node B, NB), base station controller ( base station controller, BSC), base transceiver station (base transceiver station, BTS), home base station (for example, home evolved NodeB, or home Node B, HNB), baseband unit (baseband unit, BBU), AP in WiFi system, A wireless relay node, a wireless backhaul node, a transmission point (TP) or a transmission and reception point (TRP), etc., and can also be a gNB or a transmission point (TRP) in a 5G (eg, NR) system or TP), one or a group (including multiple antenna panels) antenna panels of the base station in the 5G system, or, it can also be a network node that constitutes a gNB or a transmission point, such as a baseband unit (BBU), or, a distributed
  • the access network may provide services to the cell.
  • the terminal device may communicate with the cell through transmission resources (eg, frequency domain resources, or spectrum resources) allocated by the access network device.
  • transmission resources eg, frequency domain resources, or spectrum resources
  • AMF network element mainly used for mobility management and access management, such as user location update, user registration network, user switching, etc.
  • the AMF network element can also be used to implement other functions other than session management in a mobility management entity (mobility management entity, MME). For example, functions such as access authorization (or authentication).
  • SMF network element It is mainly used for session management, UE's Internet Protocol (IP) address allocation and management, selection of user plane functions that can be managed, policy control, or termination point of charging function interfaces, and downlink data notification, etc.
  • IP Internet Protocol
  • the main user of the SMF network element is responsible for session management in the mobile network, such as session establishment, modification, release, and the like.
  • Specific functions may include, for example, assigning IP addresses to terminal devices, selecting UPFs that provide packet forwarding functions, and the like.
  • UPF network element responsible for the forwarding and reception of user data in the terminal equipment.
  • the UPF network element can receive user data from the data network (DN), and transmit it to the terminal equipment through the access network equipment.
  • the UPF network element can also receive user data from the terminal device through the access network device and forward it to the data network.
  • the transmission resources and scheduling functions that provide services for the terminal equipment are managed and controlled by the SMF network element.
  • PCF network element a unified policy framework for guiding network behavior, providing policy rule information for control plane functional network elements (such as AMF network elements, SMF network elements, etc.), and responsible for obtaining user subscription information related to policy decision-making.
  • control plane functional network elements such as AMF network elements, SMF network elements, etc.
  • AF network element mainly supports interaction with the 3GPP core network to provide services, such as influencing data routing decisions, interacting with policy control functions (PCF), or providing third parties to the network side.
  • PCF policy control functions
  • UDM network element used to generate authentication credential, user identification processing (such as storing and managing user permanent identity, etc.), access authorization control and contract data management, etc.
  • Data Network A service network for providing data services to users.
  • the Internet Internet
  • a third-party service network an IP multimedia service (IP multi-media service, IMS) network, etc.
  • IP multimedia service IP multi-media service, IMS
  • AUSF network element mainly used for user authentication, etc.
  • each network element can communicate with each other through the interfaces shown in the figure, and some interfaces can be implemented in the form of service-oriented interfaces.
  • the UE and the AMF network element may interact through the N1 interface, and the interaction message may be called, for example, an N1 message (N1 Message).
  • the RAN and AMF network elements can interact through the N2 interface, and the N2 interface can be used for non-access stratum (non-access stratum, NAS) message transmission and so on.
  • the RAN and the UPF can interact through the N3 interface, and the N3 interface can be used to transmit data on the user plane.
  • the SMF network element and the UPF can interact through the N4 interface, and the N4 interface can be used to transmit information such as tunnel identification information of the N3 connection, data buffer indication information, and downlink data notification messages.
  • the AF and PCF can interact through the N5 interface, and the N5 interface can be used for application service request delivery and network events.
  • the UPF and the DN can interact through the N6 interface, and the N6 interface can be used to transmit data on the user plane.
  • the PCF and SMF network elements can interact through the N7 interface, and the N7 interface can be used to deliver protocol data unit (PDU) session (PDU session) granularity and business data flow granularity control policies.
  • the AMF network element and the UDM can interact through the N8 interface.
  • the N8 interface can be used by the AMF network element to obtain the subscription data and authentication data related to access and mobility management from the UDM, and to register the UE's current mobility with the UDM. Manage related information, etc.
  • the N9 interface is the interface between the UPF and the UPF, such as the interface between the visited-policy control function (V-PCF) and the home-policy control function (H-PCF), or The interface between the UPF connected to the DN and the UPF connected to the RAN is used to transfer user plane data between the UPFs.
  • the SMF network element and the UDM can interact through the N10 interface.
  • the N10 interface can be used for the SMF network element to obtain session management related subscription data from the UDM, and the SMF network element to register the UE's current session related information with the UDM.
  • the SMF network element and the AMF network element can interact through the N11 interface.
  • the N11 interface can be used to transmit the PDU session tunnel information between the RAN and the UPF, the control message sent to the UE, and the radio resource control information sent to the RAN. Wait.
  • N2 The AMF network element and the RAN can interact through the N12 interface, and the N12 interface can be used to transmit radio bearer control information from the core network side to the RAN.
  • the PCF and the AMF network elements can interact through the N15 interface, and the N15 interface can be used to deliver UE policies and access control related policies.
  • the relationship between other interfaces and each network element is shown in FIG. 1 , and for the sake of brevity, it will not be described in detail here.
  • the AMF, SMF, UPF, PCF, UDM, NSSF, AUSF, etc. shown in FIG. 1 may be understood as network elements for implementing different functions, for example, may be combined into network slices as required.
  • These network elements can be independent devices, or integrated in the same device to implement different functions, or can be network elements in hardware devices, software functions running on dedicated hardware, or platforms (for example, cloud The virtualization function instantiated on the platform), the present application does not limit the specific form of the above network element.
  • network elements with different functions can be co-located.
  • the access and mobility management network element may be co-located with the session management network element; the session management network element may be co-located with the user plane network element.
  • the name of the interface between each network element in FIG. 1 is just an example, and the name of the interface in a specific implementation may be other names, which are not specifically limited in this application.
  • the names of the messages (or signaling) transmitted between the above network elements are only an example, and do not constitute any limitation on the functions of the messages themselves.
  • some terminal devices such as 5G UE, access the core network through 3GPP access technology, or access the core network through non-3GPP (non-3GPP) access technology, all support NAS signaling.
  • Some terminal devices do not support NAS signaling when accessing the core network through a non-3GPP access technology, but can support NAS signaling when accessing through a 3GPP access technology.
  • a device N5CW device that does not support 5G wireless local access network (WLAN) (Non-5G-Capable over WLAN, N5CW), such a terminal device cannot send 5G through the WLAN access network NAS signaling.
  • WLAN wireless local access network
  • this terminal device does not support 5G NAS signaling when accessing the 5G core network (5G corenet, 5GC) through WLAN.
  • terminal equipment or UE are used to represent terminal equipment that does not support NAS signaling when accessing the core network through a certain access technology (such as the first access technology or the second access technology).
  • 5G UE is used to indicate that a different access technology (such as the first access technology or the second Technology) access to the core network, terminal equipment that supports NAS signaling, such as 5G UE is used to indicate the terminal equipment that supports NAS signaling when accessing the core network through non-3GPP access technology and through 3GPP access technology.
  • 5G UE is used to indicate that a different access technology (such as the first access technology or the second Technology) access to the core network
  • terminal equipment that supports NAS signaling such as 5G UE is used to indicate the terminal equipment that supports NAS signaling when accessing the core network through non-3GPP access technology and through 3GPP access technology.
  • FIG. 2 shows another schematic diagram of a network architecture suitable for this embodiment of the present application.
  • the network architecture shown in Figure 2 can support the N5CW device to access the network through a trusted WLAN and access the 5GC.
  • a trusted WLAN access point (TWAP) and a trusted WLAN interworking function (TWIF) network element can jointly form a trusted WLAN access network (trusted WLAN access network).
  • network, TWAN trusted WLAN access network
  • the TWIF network element has a NAS protocol stack, which can support the N1 interface and can build NAS signaling for the N5CW device. Therefore, the TWIF network element can complete the registration and session management processes on behalf of the N5CW device.
  • the N5CW device does not support NAS signaling when accessing 5GC through WLAN, that is, when the N5CW device accesses 5GC through 3GPP access technology, it supports 5G NAS signaling.
  • the embodiments of the present application are not only applicable to trusted WLAN access as shown in FIG. 2 , but also applicable to scenarios in which NAS signaling is not supported when terminal devices (such as N5CW devices) access through non-3GPP access technologies. .
  • terminal devices such as N5CW devices
  • the embodiments of the present application are not limited. For example, as long as the terminal device is accessed through a non-3GPP access technology, the NAS signaling is not supported, and the non-3GPP access gateway agent is required to perform the registration and session management procedures, the embodiments of the present application can be applied.
  • the above-mentioned network architecture applied to the embodiments of the present application is only an exemplary architecture, and the network architecture applicable to the embodiments of the present application is not limited to this, and any network architecture capable of implementing the functions of the above-mentioned network elements is applicable to Examples of this application.
  • the access network is a trusted WLAN and the terminal device is an N5CW device for illustration.
  • a terminal device establishes a PDU session after accessing the network, and accesses an external data network through the PDU session to interact with the application server deployed in the DN.
  • session handover may occur, such as session handover from non-3GPP access technology to 3GPP access technology, or session handover from 3GPP access technology to non-3GPP access technology.
  • FIG. 3 shows a schematic flowchart of the UE's session handover from a non-3GPP access technology to a 3GPP access technology.
  • FIG. 3 is taken as an example for the UE to switch a session from a non-3GPP access technology to a 3GPP access technology. The manner in which a session is switched from a 3GPP access technology to a non-3GPP access technology is similar and will not be repeated here.
  • the method shown in FIG. 3 may include the following steps.
  • the UE registers with the 3GPP side.
  • the UE When the UE has not registered on the 3GPP side, the UE first registers on the 3GPP side.
  • the UE initiates a session establishment process on the 3GPP side.
  • the UE sends a PDU session establishment request message to the AMF network element.
  • the AMF network element may send an update session context request message (Nsmf_PDUSession_UpdateSMContext Request) to the SMF network element.
  • Nsmf_PDUSession_UpdateSMContext Request an update session context request message
  • the SMF network element can complete the context update according to the request of the AMF network element.
  • the SMF network element can send the tunnel endpoint information on the UPF side and the IP address information of the session before the handover to the AMF network element.
  • the AMF network element can send the tunnel endpoint information to the RAN, so that the RAN knows how to send uplink data.
  • the UE When the UE performs session handover between the 3GPP access technology and the non-3GPP access technology, it is more critical that the UE needs to set the request type (request type) in the session establishment request message to "existing PDU session ( existing PDU session) (or existing PDU session)", and provide the session ID of the session that you want to switch to.
  • Some terminal devices such as N5CW devices, cannot directly send NAS signaling to the core network when accessing 5GC through a trusted WLAN, so the TWIF network element is required to complete the registration and session establishment processes on its behalf. Therefore, in this context, it is not feasible for N5CW device to use the above mechanism to complete the session handover process between 3GPP access technology and non-3GPP access technology. The reason is as follows.
  • the session is switched from a 3GPP access technology to a non-3GPP access technology.
  • the N5CW device has completed the registration and session establishment process through the 3GPP access technology, that is, the session ID of the established session is generated by the terminal device (the terminal device knows the session ID).
  • the TWIF network element agent completes the registration process, and after the TWIF network element receives the IP configuration request message sent by the N5CW device, it initiates the session establishment process.
  • the session establishment request The type is initial request, and the session identifier is a fixed value. Since the N5CW device does not provide any parameter information about session establishment to the TWIF network element, the TWIF network element establishes a new session as the N5CW device proxy by default.
  • the above mechanism cannot be used to send a session establishment request with the request type "existing PDU session", and the session ID carried will be inconsistent with the session ID used by the N5CW device to establish a session on the 3GPP side. Therefore, the network side cannot use the above mechanism to perform the session switching process.
  • the session is switched from a non-3GPP access technology to a 3GPP access technology.
  • the TWIF network element acts as an agent for the N5CW device to perform the registration and session establishment process. That is, the N5CW device will not know the relevant parameters about session establishment.
  • the N5CW device accesses the 5GC through the 3GPP access technology, when establishing a session, it will not send a session establishment request message with the request type "existing PDU session" like the above mechanism, nor can it provide the session ID of the established session. Therefore, the existing session switching mechanism cannot be performed.
  • some terminal devices such as N5CW devices
  • N5CW devices that is, those that do not support NAS signaling when accessed through non-3GPP access technologies, but can support NAS signaling when accessed through 3GPP access technologies, cannot be as existing The same technology completes session switching.
  • This embodiment of the present application proposes a solution that enables the session of this type of terminal device to run on different connections in a manner indicated by a terminal device, or indicated by a network device, or determined by the network device itself, such as determined according to relevant session parameters. switch between access technologies, such as switching between 3GPP access technologies and non-3GPP access technologies.
  • FIG. 4 is a schematic diagram of a method 400 for session switching provided by an embodiment of the present application.
  • Method 400 may include the following steps.
  • the terminal device sends the first indication information to the network device.
  • the first indication information is used for instructing to switch a session of the terminal device, where the session is a session established through the first access technology.
  • Switching the session may include switching the session from the first access technology to the second access technology.
  • the session is a session established by the terminal device through the first access technology; after the switch, the session is the terminal device using the second access technology.
  • Sessions established by incoming technology, such as the identity of the session may change.
  • the first indication information is denoted as indication information #1.
  • the indication information #1 includes information that the session is an existing session.
  • the indication information #1 may be a request type indicating that the session is an existing session.
  • the terminal device can send a request message to the AMF network element, and the request message can include a request type (request type), and the request type is "existing PDU session". According to the request type, the AMF network element learns that the purpose of the request is session switching.
  • the network device determines that the terminal device is a terminal device that does not support NAS signaling when accessing the core network through the first access technology or through the second access technology.
  • the network device may determine that the terminal device is a terminal device that does not support NAS signaling when accessing the core network through the first access technology or through the second access technology according to one or more of the following information: the second indication information, the terminal device identification information, session identification information, and identification information of access network equipment.
  • the access network device is an access network device corresponding to the first access technology or the second access technology.
  • the second indication information is sent by the terminal device to the network device, and the second indication information is used to indicate that the terminal device is a terminal device that does not support NAS signaling when accessing the core network through the first access technology or through the second access technology.
  • the access network device when the terminal device does not support NAS signaling when accessing the core network through the first access technology, the access network device is the access network device corresponding to the first access technology; for another example, the terminal device uses the second access technology to access the network device.
  • the access network device When the access technology does not support NAS signaling when accessing the core network, the access network device is the access network device corresponding to the second access technology.
  • the above information for example, may be obtained locally by the network device, or may also be received, which is not limited thereto.
  • the network device can use any of the following methods to determine that the terminal device is accessing the core network through the first access technology. Terminal devices that do not support NAS signaling.
  • the network device obtains (or searches for) the context information of the terminal device (such as session context information or session-related context information) according to the identification information of the terminal device, and according to the context information of the terminal device
  • the first identification information of the session (for example, a special value or a fixed value) determines that the terminal device is a terminal device that does not support NAS signaling when accessing the core network through the first access technology.
  • the network device determines, according to the identification information of the access network device, that the terminal device is a terminal device that does not support NAS signaling when accessing the core network through the first access technology.
  • the network device receives the first identification information of the session (such as a special value or a fixed value), and determines, according to the first identification information of the session, that the terminal device accesses the core network through the first access technology.
  • Terminal equipment that does not support NAS signaling.
  • the network device performs handover of the session from the first access technology to the second access technology.
  • the network device may be a core network element, such as a first core network element.
  • the network element of the first core network can be, for example, an AMF network element, or can also be any other network element that can implement the AMF network element function, which is not limited.
  • the terminal device may also send one or more of the following information to the network device (such as an AMF network element): a session identifier (such as a PDU session ID (PDU session ID)), a data network name requested by the UE ( parameters such as data network name, DNN) (UE requested DNN), slice information (such as network slice selection assistance information (S-NSSAI)).
  • a session identifier such as a PDU session ID (PDU session ID)
  • PDU session ID PDU session ID
  • DNN data network name
  • UE requested DNN UE requested DNN
  • slice information such as network slice selection assistance information (S-NSSAI)
  • the session identifier may be the first identifier of the session or the second identifier of the session.
  • the first identifier of the session is the session identifier before the handover, that is, the session identifier when the session is established through the first access technology.
  • the second identifier of the session may be a default value (such as a null value) or an identifier newly generated by the terminal device, or may also represent the session identifier when the session is established through the second access technology.
  • the second identifier of the session is used to represent an identifier related to the session other than the first identifier of the session.
  • the network device may send the second identification information and third indication information of the session to the second core network element (such as the SMF network element), and the third indication information is used to associate the first identification information and the first identification information of the session.
  • Identification information To distinguish, without loss of generality, the third indication information is denoted as indication information #2.
  • the specific association method may be to replace the first identification of the session with the second identification of the session; or may be to add the second identification of the session, that is, a session may be associated with multiple session identifications, which is not limited.
  • the first identifier of the session is recorded as session identifier #1
  • the second identifier of the session is recorded as session identifier #2.
  • the method 400 is briefly introduced above, and a possible process applicable to the method 400 will be described in detail below with reference to the example shown in FIG. 6 .
  • the access technology is used to represent the access technology used by the terminal device to access the communication device, or the access technology used by the terminal device to establish a communication connection with the communication device.
  • the first access technology is 3GPP access technology, that is, the terminal device and other devices can communicate through the wireless interface of the 3GPP access technology;
  • the second access technology is 3GPP access technology, that is, the terminal device and other devices Devices can communicate through interfaces of non-3GPP access technologies.
  • the first access technology is a non-3GPP access technology, that is, the terminal device and other devices can communicate through an interface of a non-3GPP access technology;
  • the second access technology is a 3GPP access technology, that is, the terminal device It can communicate with other devices through the wireless interface of 3GPP access technology.
  • the terminal device can directly instruct the handover to the network device (such as the AMF network element). It should be understood that the terminal device can also indirectly instruct the handover to the network device (such as an AMF network element), and specifically, adaptive adjustment can be made according to the actual communication situation.
  • the terminal device when the terminal device wants to switch sessions, it can instruct the TWIF network element to perform session switching. After the TWIF network element determines the session switching, the TWIF network element instructs the core network element for session switching.
  • the terminal device may instruct the network device to hand over through the non-3GPP.
  • the terminal device sends indication information (to distinguish, the indication information is marked as indication information #3) and/or session identifier #1 to the TWIF network element, and the indication information #3 is used to instruct to switch the session of the terminal device; the TWIF network element According to the indication information #3 and/or the session identifier #1, it can be determined to switch the session from the first access technology to the second access technology, and then the TWIF network element sends an instruction to the core network element to indicate the session switch.
  • the TWIF network element sends a request type to the AMF network element, where the request type is used to indicate session switching.
  • an exemplary description is given below in conjunction with the example shown in FIG. 7 .
  • the terminal device can provide indication information to the network side to inform the core network that the terminal device requests to execute the session switching process. Based on the indication of the terminal device, the network side can clearly know that the terminal device wants to request a session switch.
  • FIG. 5 is a schematic diagram of a method 500 for session switching provided by an embodiment of the present application.
  • Method 500 may include the following steps.
  • the network device receives a request message, where the request message is used to request to establish a second session for the terminal device through the second access technology.
  • the network device may receive a request message from a terminal device, or may receive a request message from a TWIF network element. Specifically, it may be determined based on the actual communication situation, which is not limited.
  • the network device determines that the terminal device is a terminal device that does not support NAS signaling when accessing the core network through the first access technology or through the second access technology.
  • step 520 reference may be made to the description of step 420 above, which will not be repeated here.
  • the network device determines to switch the first session established through the first access technology.
  • the network device may determine to switch the first session by using the same first parameter of the first session established by the first access technology as the second parameter of the second session.
  • the parameters of the session include one or more of the following information: data network name, connection status of the terminal device, slice information, subscription data information of the terminal device, and session policy information.
  • the network device By judging whether the first parameter of the first session established by the first access technology is consistent with or similar to the second parameter of the second session, it can be used for the network device to determine whether to switch the existing session.
  • the network device may also determine to switch the first session according to subscription data and policies of the terminal device.
  • the network device switches the first session to the second session.
  • the network device switches the first session to the second session, which means that the session is switched from the first access technology to the second access technology.
  • a session; after the handover, the session is the second session established by the terminal device through the second access technology.
  • the network device is a network element of the first core network.
  • the first core network element is an AMF network element, that is, the handover is performed by the AMF network element.
  • the first core network element can send the session identifier #2 and the indication information #2 to the second core network element (such as the SMF network element), and the indication information #2 is used for association Session ID #1 and Session ID #2.
  • the first core network element such as the AMF network element
  • the terminal device is a terminal device that does not support NAS signaling when accessing the core network through the first access technology or through the second access technology ( For example, the terminal device is N5CW device)
  • the session switch is determined according to the session-related parameters.
  • the network device is a network element of the second core network.
  • the second core network element is an SMF network element, that is, the handover is performed by the SMF network element.
  • the second core network element can send the session identifier #2 and the indication information #4 to the first core network element (such as the AMF network element), and the indication information #4 is used for association. Session ID #1 and Session ID #2.
  • the second core network element can send the session context identifier and indication information #4 to the first core network element (such as the AMF network element), and the indication information #4 is used to indicate the first core network element.
  • a core network element performs session handover.
  • the first core network element sends the session identifier #2 to the second core network element according to the indication information #4; the second core network element associates the session identifier #1 with the session identifier #2.
  • the second core network element (such as the SMF network element) determines that the terminal device is a terminal device that does not support NAS signaling when accessing the core network through the first access technology or through the second access technology ( For example, the terminal device is N5CW device), and the session switch is determined according to the session-related parameters.
  • the network device when the network device determines that the terminal device is a terminal device that does not support NAS signaling when accessing the core network through the first access technology or through the second access technology, such as an N5CW device, the network device can determine the first When the parameters of the session established by the access technology are the same as or similar to the parameters of the session established by the second access technology, it is determined to perform handover.
  • session #1 the session for session switching
  • the first core network element as the AMF network element
  • the second core network element as the SMF network element
  • session #1 can be replaced with one or more other sessions that need to be switched.
  • UE stands for terminal equipment.
  • the UE may be a terminal device that does not support NAS signaling when accessing the core network through a non-3GPP access technology, or the UE may be a terminal device that does not support NAS signaling when accessing the core network through a 3GPP access technology.
  • the session identifiers mentioned below in FIGS. 6 to 11 include, in some scenarios, session identifier #1, that is, the session identifier before the handover (that is, the session identifier when the session establishes the session through the access technology before the switchover). ); in some scenarios, it is session ID #2, that is, session ID other than session ID #1, for example, it may be a default value (such as a null value) or an ID newly generated by the terminal device, or it may indicate that the session has passed the switched Session ID established by the access technology.
  • session ID #1 that is, the session identifier before the handover (that is, the session identifier when the session establishes the session through the access technology before the switchover).
  • session ID #2 that is, session ID other than session ID #1, for example, it may be a default value (such as a null value) or an ID newly generated by the terminal device, or it may indicate that the session has passed the switched Session ID established by the access technology.
  • FIG. 6 is a schematic flowchart of a session switch applicable to an embodiment of the present application.
  • the method 600 shown in FIG. 6 may be used in a scenario where session #1 is handed over from a non-3GPP access technology to a 3GPP access technology.
  • the method 600 shown in FIG. 6 may include the following steps.
  • the TWIF network element completes the process of registration and session establishment on behalf of the UE.
  • the UE can learn the session identifier of the session (ie, session identifier #1).
  • the TWIF network element may send a session identifier (such as a PDU session ID) of the session to the UE after completing the session establishment.
  • a session identifier such as a PDU session ID
  • the UE can learn the session identifier of the session established on the trusted WLAN side.
  • the IP configuration response message sent by the TWIF network element to the UE includes the session identifier of session #1.
  • the UE is made aware of the session identifier of the session #1 established on the trusted WLAN side.
  • step 601 for the specific process of the TWIF network element proxying the UE (such as the N5CW device) to complete the registration and session establishment, for example, reference may be made to the prior art, which is not limited thereto. As an example, step 601 may refer to the flow shown in FIG. 12 below.
  • the UE completes the 3GPP side registration process.
  • step 602 for the specific process for the UE to complete the registration on the 3GPP side, for example, reference may be made to the prior art, which is not limited thereto. As an example, step 602 may refer to the flow shown in FIG. 13 below.
  • the UE sends a session establishment request message to the AMF network element.
  • the UE sends a session establishment request message to the AMF network element through the 3GPP access technology.
  • the UE When the UE wants to switch the session on the original trusted WLAN side (such as session #1) to the 3GPP access technology, it can send a session establishment request message (such as a PDU session establishment request message) to the AMF network element. .
  • a session establishment request message such as a PDU session establishment request message
  • the session establishment request message may include but not limited to one or more of the following: session identifier (such as PDU session ID), request type (request type), data network name requested by the UE (UE requested DNN), slice information (such as S-NSSAI) and other parameters.
  • session identifier such as PDU session ID
  • request type request type
  • data network name requested by the UE UE requested DNN
  • slice information such as S-NSSAI
  • the session request type is "existing PDU session", which indicates that an existing session or an existing session (such as session #1) is to be switched.
  • the session identifier may be session identifier #2, for example, the value may be null, or may be a session identifier newly generated by the UE; or, may also be session identifier #1 obtained by the UE in step 601.
  • the AMF network element determines to perform session switching.
  • the AMF network element learns that the purpose of the session establishment request is session switching.
  • the AMF network element may determine, according to the UE, whether to perform session handover or reject the session establishment request.
  • the AMF network element determines that the UE is an N5CW device when it accesses the core network through a non-3GPP access technology. In this case, the AMF network element may continue to perform the session, ie, perform steps 606-610.
  • the AMF network element determines that the UE is a normal UE when it accesses the core network through a non-3GPP access technology (that is, it can support NAS signaling, such as a 5G UE). In this case, the AMF network element considers that the session establishment request message is an error (incorrect parameters), and rejects the session establishment request, that is, step 605 is executed.
  • the AMF network element may determine that the UE is an N5CW device when it is accessed through a non-3GPP access technology based on any of the following methods.
  • the AMF network element may determine that the UE is an N5CW device according to the special value or fixed value (such as the value 15) of the session identifier (namely, session identifier #1) of the session established by the UE on the non-3GPP side.
  • the AMF network element can map the UE ID to the corresponding UE ID according to the UE ID (eg, the protocol ID through the N2 interface), Acquire (or look up) the context information of the UE. If the session identifier #1 is found to be a special value or a fixed value in the UE context information, it is determined that the UE is an N5CW device when it accesses the core network through a non-3GPP access technology.
  • the AMF network element can determine, according to the session ID in the session establishment request message, that the UE accesses the UE through a non-3GPP access technology. is the N5CW device.
  • the AMF network element may determine that the UE is an N5CW device according to the TWIF network element identification information (such as a global TWIF node ID (global TWIF node ID)).
  • TWIF network element identification information such as a global TWIF node ID (global TWIF node ID)
  • the AMF network element can map the UE ID (eg, the protocol ID through the N2 interface to the corresponding UE ID) according to the UE ID , determine the TWIF network element identification information, and determine that the UE is an N5CW device when it is accessed through a non-3GPP access technology.
  • the AMF network element may determine that the UE is an N5CW device according to the UE's instruction.
  • the UE sends indication information to the AMF, where the indication information is used to indicate that the UE is an N5CW device.
  • the AMF network element can determine that the UE is an N5CW device.
  • the AMF network element sends a session establishment rejection message to the UE.
  • step 604 if the AMF network element determines that the session establishment request message is an error instance, the AMF network element sends a session establishment rejection message (such as a PDU session establishment reject message) to the UE.
  • a session establishment rejection message such as a PDU session establishment reject message
  • the AMF may determine that the session establishment request message is an error instance, and the AMF network element sends a session establishment rejection message to the UE.
  • the AMF network element sends an update session context request message to the SMF network element.
  • step 604 if the AMF network element determines that the session establishment request message is valid, then the AMF network element may send an update session context request message to the SMF network element, such as the Nsmf interface PDU session update session management context request (Nsmf_PDUSession_UpdateSMContext Request) message.
  • the AMF network element may also obtain (or search for) the session context identifier corresponding to the session before the handover (that is, the session established by the trusted WLAN).
  • Nsmf_PDUSession_UpdateSMContext Request message is only an exemplary description, and is not limited thereto.
  • the update session context request message may include but not limited to one or more of the following: context identifier (SM context ID), access type (access type), access technology type (RAT type), Session identification, session handover indication (handover indication) information.
  • SM context ID context identifier
  • access type access type
  • RAT type access technology type
  • Session identification Session identification
  • session handover indication session handover indication information.
  • the session switching indication information is used to instruct the session switching, or is used to instruct the execution of the session switching process.
  • step 603 the session identifier sent by the UE is newly generated by the UE.
  • the update session context request message may further include session switching indication information.
  • the SMF network element may perform session switching according to the session switching instruction.
  • the session switching indication can be used to prevent the SMF network element from being mistaken for an error instance and not performing session switching.
  • the session identifier may be modified or added. Therefore, it can be indicated to the SMF network element through the session switching indication information.
  • including the session identifier is a special case. For the N5CW device, it is possible to prevent the SMF network element from being mistaken for an error instance and not performing session switching.
  • the update session context request message may further include the session identifier newly generated by the UE. Therefore, the SMF network element can be made aware of the session identifier newly generated by the UE, so that the session-related information on the side of the UE and the SMF network element can be kept consistent in the subsequent communication process.
  • the update session context request message may further include session switching indication information.
  • the session handover indication information is used to indicate the session handover, or to indicate the session handover procedure, or, alternatively, to indicate the first identifier of the associated session and the session identifier newly generated by the UE.
  • the first identifier of the associated session and the session identifier newly generated by the UE are indicated many times through the indication information, and the specific indication manner is not limited.
  • the session switching indication can be used to indicate the first identifier of the associated session and the session identifier newly generated by the UE; or, it can also be the first identifier of the associated session and the session identifier newly generated by the UE by default or pre-agreed; It is to indicate the first identifier of the associated session and the session identifier newly generated by the UE through other indication information, etc., which is not limited.
  • step 603 the session ID sent by the UE is null or the session ID before handover.
  • the update session context request message may not include the session identifier and session switching indication information.
  • the SMF network element sends an update session context response message to the AMF network element.
  • Nsmf_PDUSession_UpdateSMContext Response an update session context response message, such as an Nsmf interface PDU session update session management context response (Nsmf_PDUSession_UpdateSMContext Response) message, to the AMF network element.
  • Nsmf_PDUSession_UpdateSMContext Response is only an exemplary description, which is not limited thereto.
  • the SMF network element selects the original UPF.
  • the SMF network element selects the same UPF as the session before the handover (that is, the session established through the non-3GPP access technology), so as to ensure that the IP address of the session after the handover is consistent with the IP address of the session before the handover, so that the service can be guaranteed. continuity.
  • the session is established.
  • the SMF network element sends the IP address of the session before the handover (that is, the session established by the non-3GPP access technology) to the UE through the AMF network element, and sends the CN tunnel information on the UPF side to the RAN through the AMF network element for uplink. data transmission.
  • the RAN sends the AN tunnel information on the RAN side to the UPF through the AMF network element and the SMF network element for downlink data transmission.
  • step 609 is not limited in this embodiment of the present application.
  • step 609 may refer to the prior art.
  • step 609 may refer to the flow shown in FIG. 14 below (eg, steps 1411-1417).
  • the AMF network element releases trusted WLAN resources.
  • the AMF network element may perform an N2 resource release procedure to release trusted WLAN resources.
  • the terminal device can also indirectly instruct the handover to the network device (such as the AMF network element).
  • the network device such as the AMF network element
  • FIG. 7 is another schematic flowchart of a session switch applicable to an embodiment of the present application.
  • the method 700 shown in FIG. 7 may be used in a scenario where session #1 is handed over from a 3GPP access technology to a non-3GPP access technology.
  • the method 700 shown in FIG. 7 may include the following steps.
  • the UE completes the 3GPP side registration and session establishment procedures.
  • step 701 may refer to the flow shown in FIG. 13 and FIG. 14 below.
  • the UE completes the trusted WLAN side registration process.
  • step 702 the UE (such as the N5CW device) completes the specific process of the trusted WLAN side registration, for example, reference may be made to the prior art, which is not limited. As an example, step 702 may refer to the registration process shown in FIG. 12 below.
  • the UE sends an IP configuration request (IP Configuration Request) message to the TWIF network element.
  • IP Configuration Request IP Configuration Request
  • the IP configuration request message may include session identification and/or session switching indication information.
  • the session identifier is a session identifier (ie, session identifier #1) of a session established by the UE on the 3GPP side.
  • the session switching indication information is used to instruct the session switching, or is used to instruct the execution of the session switching process.
  • the TWIF network element determines to execute the session switching process according to the session identifier and/or the session switching indication information.
  • the TWIF network element may determine to execute the session switching process according to the session switching indication information. For another example, the TWIF network element may determine to perform the session switching procedure for the existing session according to the session identifier sent by the UE.
  • the TWIF network element sends a session establishment request message to the AMF network element.
  • the session establishment request message (such as the PDU session establishment request message) may include, but is not limited to: session identifier (such as PDU session ID), request type (request type), data network name requested by the UE (UE requested DNN), slice information (such as S-NSSAI) and other parameters.
  • the session request type is "existing PDU session", and the request type indicates that an existing session or an existing session is to be switched.
  • the session identifier for example, can be session identifier #1 received by the TWIF network element in step 703; or, it can also be session identifier #2; or, it can also include session identifier #1 received by the TWIF network element in step 703 and session ID #2.
  • the TWIF network element may also indicate associated session ID #1 and session ID #2.
  • the AMF network element sends an update session context request message to the SMF network element.
  • the AMF network element learns that the purpose of the session establishment request is session switching.
  • the AMF network element sends an update session context request message (such as a Nsmf_PDUSession_UpdateSMContext Request message) to the SMF network element.
  • the update session context request message may include session-related parameters that need to be updated.
  • the update session context request message may include, but is not limited to, one or more of the following: a context identifier (SM context ID), an access type (access type), an access technology type (RAT type), and the like.
  • SM context ID context identifier
  • access type access type
  • RAT type access technology type
  • the SMF network element sends an update session context response message to the AMF network element.
  • the SMF network element may send an update session context response message (such as a Nsmf_PDUSession_UpdateSMContext Response message) to the AMF network element.
  • an update session context response message such as a Nsmf_PDUSession_UpdateSMContext Response message
  • Nsmf_PDUSession_UpdateSMContext Response message is only an exemplary description, which is not limited thereto.
  • the SMF network element selects the original UPF.
  • the SMF network element selects the same UPF as the session before the handover (that is, the session established through the 3GPP access technology), so as to ensure that the IP address of the session after the handover is consistent with the IP address of the session before the handover, thus ensuring service continuity sex.
  • the session is established.
  • the SMF network element sends the IP address of the session before the handover (that is, the session established through the 3GPP access technology) to the UE through the AMF network element, and sends the CN tunnel information on the UPF side to the TWIF network element through the AMF network element, for the purpose of Upstream data transmission.
  • the TWIF network element sends the AN tunnel information on the RAN side to the UPF through the AMF network element and the SMF network element for downlink data transmission.
  • step 709 is not limited in this embodiment of the present application.
  • step 709 may refer to the prior art.
  • step 709 may refer to the flow shown in FIG. 12 below.
  • the AMF network element releases 3GPP side resources.
  • the AMF network element can perform the N2 resource release procedure to release the 3GPP side resources.
  • the terminal device can provide indication information to the network side to inform the network side that the terminal device requests to execute the session switching process. Based on the indication of the terminal device, the network side can clearly know that the terminal device wants to request a session switch.
  • the network side determines that the session switch can be performed (for example, the context information of the session before the switch can be obtained (or searched), etc.), the session switch is performed, and the update of the session parameters is completed.
  • the session ID can be modified or added, so that the terminal device is not required to know the session ID under another access technology in advance, that is, in the session request message sent by the terminal device, no matter If the session ID is empty or a new ID or an original ID, the above solutions can implement session switching.
  • FIG. 8 is a schematic flowchart of a session switch applicable to another embodiment of the present application.
  • the method 800 shown in FIG. 8 can be applied to the solution 1 in the above-mentioned method 500, and the method 800 can be used in a scenario where session #1 is switched from a non-3GPP access technology to a 3GPP access technology.
  • the method 800 shown in FIG. 8 may include the following steps.
  • the TWIF network element completes the process of registration and session establishment on behalf of the UE.
  • step 801 may refer to the prior art, which is not limited.
  • step 801 may refer to the flow shown in FIG. 12 below.
  • the UE completes the 3GPP side registration process.
  • step 802 for the specific process for the UE to complete the registration on the 3GPP side, for example, reference may be made to the prior art, which is not limited thereto. As an example, step 802 may refer to the flow shown in FIG. 13 below.
  • the UE sends a session establishment request message to the AMF network element.
  • the UE sends a session establishment request message to the AMF network element through the 3GPP access technology.
  • the UE When the UE wants to switch the session (such as session #1) on the original trusted WLAN side to the 3GPP access technology, it can send a session establishment request message (such as a PDU session establishment request message) to the AMF network element.
  • a session establishment request message such as a PDU session establishment request message
  • the session establishment request message may include but not limited to one or more of the following: session identifier (such as PDU session ID), request type (request type), data network name requested by the UE (UE requested DNN), slice information (such as S-NSSAI) and other parameters.
  • the session request type is "Initial Request”.
  • the session ID is session ID #2, such as a session ID newly generated by the UE or a default value (eg, a null value).
  • the AMF network element sends a session context creation request message to the SMF network element.
  • the AMF network element learns according to the request type that the session establishment request message is a request to establish a new session.
  • the AMF network element may send a create session context request message, such as an Nsmf interface PDU create session context request message (Nsmf_PDUSession_CreateSMContext Request) message, to the SMF network element.
  • a create session context request message such as an Nsmf interface PDU create session context request message (Nsmf_PDUSession_CreateSMContext Request) message, to the SMF network element.
  • Nsmf_PDUSession_CreateSMContext Request message is only an exemplary description, which is not limited.
  • the session context creation request message may include session-related parameter information.
  • the create session context request message may include but not limited to one or more of the following: UE identifier (such as subscription permanent identifier (SUPI)), session identifier (such as PDU session ID), data network name ( DNN), slice information (such as S-NSSAI), etc.
  • the session ID may be session ID #2, such as a session ID newly generated by the UE or a default value (eg, a null value).
  • the SMF network element determines to perform session switching.
  • the SMF network element can determine that the UE is an N5CW device according to the relevant parameters, and determine to perform session handover according to the session parameters. For example, the SMF network element may determine to perform session handover according to the session-related parameter information received in step 804, such as UE identifier, session identifier, data network name, slice information, and the like.
  • the SMF network element can determine that the UE is an N5CW according to the session ID #1 of the session before the handover (the session established on the trusted WLAN side) (for example, session ID #1 is a special value or a fixed value (eg, value 15)). device. For example, the SMF network element can obtain (or find) the context information of the UE according to the UE identity. If the session identity #1 is found to be a special value or a fixed value in the UE context information, the UE is determined to be an N5CW device.
  • session ID #1 is a special value or a fixed value (eg, value 15)
  • the SMF network element can obtain (or find) the context information of the UE according to the UE identity. If the session identity #1 is found to be a special value or a fixed value in the UE context information, the UE is determined to be an N5CW device.
  • the SMF network element may determine, according to the relevant parameters of the session to be established, such as data network name, slice information, etc., that the relevant parameters of the session to be established are consistent with or similar to the relevant parameters of the existing session, and determine the relevant parameters of the session to be established. session to switch.
  • the relevant parameters of the session to be established such as data network name, slice information, etc.
  • the SMF network element may also determine to switch the session according to the UE's subscription data and policies.
  • the UE may indicate to the SMF network element that the UE is an N5CW device, and the SMF network element may determine that the UE is an N5CW device according to the UE's instruction.
  • the SMF network element sends a create session context response message to the AMF network element.
  • the SMF network element sends a create session context response message, such as a Nsmf interface PDU create session context response message (Nsmf_PDUSession_CreateSMContext Response) message, to the AMF network element.
  • a create session context response message such as a Nsmf interface PDU create session context response message (Nsmf_PDUSession_CreateSMContext Response) message, to the AMF network element.
  • Nsmf_PDUSession_CreateSMContext Response message is only an exemplary description, which is not limited.
  • the session context creation response message may include, but is not limited to, a session switch indication and a session context identifier corresponding to the session before the switch.
  • the session switching indication information is used to instruct the session switching, or is used to instruct the execution of the session switching process.
  • the session switching instruction may also be specifically used to instruct the AMF network element to perform the session switching process.
  • the AMF network element sends an update session context request message to the SMF network element.
  • the AMF network element may send an update session context request message (such as a Nsmf_PDUSession_UpdateSMContext Request message) to the SMF network element.
  • an update session context request message such as a Nsmf_PDUSession_UpdateSMContext Request message
  • the update session context request message may include but not limited to one or more of the following: session context identifier (SM context ID), access type (access type), access technology type (RAT type) , session ID.
  • the session context identifier may be the session context identifier included in the response message in step 806 .
  • the session ID can be used to replace session ID #1 (that is, the session ID of a session established through a non-3GPP access technology); or, the session ID can be used as a supplementary session ID, that is, allowing two different session IDs to be associated with The same session context information.
  • the SMF network element sends an update session context response message to the AMF network element.
  • the SMF network element may send an update session context response message (such as a Nsmf_PDUSession_UpdateSMContext Response message) to the AMF network element.
  • an update session context response message such as a Nsmf_PDUSession_UpdateSMContext Response message
  • Nsmf_PDUSession_UpdateSMContext Response message is only an exemplary description, which is not limited thereto.
  • the SMF network element selects the original UPF.
  • the SMF network element selects the same UPF as the session before the handover (that is, the session established through the non-3GPP access technology), so as to ensure that the IP address of the session after the handover is consistent with the IP address of the session before the handover, so that the service can be guaranteed. continuity.
  • the session is established.
  • the SMF network element sends the IP address of the session before the handover (that is, the session established by the non-3GPP access technology) to the UE through the AMF network element, and sends the CN tunnel information on the UPF side to the RAN through the AMF network element for uplink. data transmission.
  • the RAN sends the AN tunnel information on the RAN side to the UPF through the AMF network element and the SMF network element for downlink data transmission.
  • step 810 is not limited in this embodiment of the present application.
  • step 810 may refer to the prior art.
  • step 810 may refer to the flow shown in FIG. 14 below (eg, steps 1411-1417).
  • the AMF network element releases trusted WLAN resources.
  • the AMF network element executes the N2 resource release process to release trusted WLAN resources.
  • FIG. 9 is a schematic flowchart of a session switch applicable to another embodiment of the present application.
  • the method 900 shown in FIG. 9 can be applied to the solution 1 in the above-mentioned method 500, and the method 900 can be used in a scenario where session #1 is switched from a 3GPP access technology to a non-3GPP access technology.
  • the method 900 shown in FIG. 9 may include the following steps.
  • the UE completes the 3GPP side registration and session establishment procedures.
  • step 901 may refer to the flow shown in FIG. 13 and FIG. 14 below.
  • the UE completes the trusted WLAN side registration process.
  • step 902 the UE (such as the N5CW device) completes the specific process of the trusted WLAN side registration, for example, reference may be made to the prior art, which is not limited. As an example, step 902 may refer to the registration process shown in FIG. 12 below.
  • the UE (such as the N5CW device) sends an IP configuration request message to the TWIF network element.
  • the TWIF network element sends a session establishment request message to the AMF network element.
  • the TWIF network element After receiving the IP configuration request message from the UE (such as the N5CW device), the TWIF network element initiates the session establishment process.
  • the TWIF network element sends a session establishment request message (such as a PDU session establishment request message) to the AMF network element.
  • the session establishment request message may include, but is not limited to, one or more of the following: session identifier (such as PDU session ID), request type (request type), data network name requested by the UE (UE requested DNN), slice information (such as S-NSSAI) and other parameters.
  • the session request type is "Initial Request", which indicates that a new session is to be established.
  • the session identifier is a special value or a fixed value, for example.
  • the AMF network element sends a session context creation request message to the SMF network element.
  • the AMF network element learns according to the request type that the session establishment request message is a request to establish a new session.
  • the AMF network element may send a create session context request message (eg, Nsmf_PDUSession_CreateSMContext Request message) to the SMF network element.
  • a create session context request message eg, Nsmf_PDUSession_CreateSMContext Request message
  • Nsmf_PDUSession_CreateSMContext Request message is only an exemplary description, which is not limited.
  • the session context creation request message may include session-related parameter information.
  • the create session context request message may include but not limited to one or more of the following: UE identity (such as SUPI), session identity (such as PDU session ID), data network name (DNN), slice information (such as S-NSSAI) )Wait.
  • UE identity such as SUPI
  • session identity such as PDU session ID
  • DNN data network name
  • slice information such as S-NSSAI)
  • the session identifier is a special value or a fixed value, for example.
  • the SMF network element determines to perform session switching.
  • the SMF network element can determine that the UE is an N5CW device according to the relevant parameters, and determine to perform session handover according to the session parameters. For example, the SMF network element may determine to perform session handover according to the session-related parameter information received in step 905, such as UE identifier, session identifier, data network name, slice information, and the like.
  • the SMF network element can determine that the UE is an N5CW device. For example, the SMF network element can determine the UE as the N5CW device according to the session identifier, that is, the session identifier (special value or fixed value) included in the session establishment request message sent by the TWIF network element.
  • the session identifier that is, the session identifier (special value or fixed value) included in the session establishment request message sent by the TWIF network element.
  • the SMF network element may determine that the relevant parameters of the session to be established are consistent with or similar to the relevant parameters of the existing session according to the relevant parameters of the session to be established, such as the data network name, slice information, etc. There is a session to switch.
  • the SMF network element may also determine to switch the existing session according to the UE's subscription data and policies.
  • the UE may indicate to the SMF network element that the UE is an N5CW device, and the SMF network element may determine that the UE is an N5CW device according to the UE's instruction.
  • the SMF network element sends a create session context response message to the AMF network element.
  • the SMF network element sends a create session context response message (such as a Nsmf_PDUSession_CreateSMContext Response message) to the AMF network element.
  • a create session context response message such as a Nsmf_PDUSession_CreateSMContext Response message
  • Nsmf_PDUSession_CreateSMContext Response message is only an exemplary description, which is not limited.
  • the session context creation response message may include, but is not limited to, the session switching indication and the session context identifier corresponding to the existing session.
  • the session switching indication information is used to instruct the session switching, or is used to instruct the execution of the session switching process.
  • the session switching instruction can also be specifically used to instruct the AMF network element to perform the session switching process.
  • the AMF network element sends an update session context request message to the SMF network element.
  • the AMF network element may send an update session context request message (such as a Nsmf_PDUSession_UpdateSMContext Request message) to the SMF network element.
  • an update session context request message such as a Nsmf_PDUSession_UpdateSMContext Request message
  • the update session context request message may include but not limited to one or more of the following: context identifier (SM context ID), access type (access type), access technology type (RAT type), Session ID.
  • the session context identifier may be the session context identifier included in the response message in step 907 .
  • the session ID can be used to replace session ID #1 (that is, the session ID of the session established through the 3GPP access technology); or, the session ID can be used as a supplementary session ID, that is, two different session IDs can be associated with the same session ID. Session context information.
  • the SMF network element sends an update session context response message to the AMF network element.
  • the SMF network element may send an update session context response message (such as a Nsmf_PDUSession_UpdateSMContext Response message) to the AMF network element.
  • an update session context response message such as a Nsmf_PDUSession_UpdateSMContext Response message
  • Nsmf_PDUSession_UpdateSMContext Response message is only an exemplary description, which is not limited thereto.
  • the SMF network element selects the original UPF.
  • the SMF network element selects the same UPF as the session before the handover (that is, the session established through the 3GPP access technology), so as to ensure that the IP address of the session after the handover is consistent with the IP address of the session before the handover, thus ensuring service continuity sex.
  • the SMF network element sends the IP address of the session before the handover (that is, the session established through the 3GPP access technology) to the TWIF network element through the AMF network element, and sends the CN tunnel information on the UPF side to the TWIF network element through the AMF network element, For upstream data transmission.
  • the TWIF network element sends the AN tunnel information on the RAN side to the UPF through the AMF network element and the SMF network element for downlink data transmission.
  • step 911 is not limited in this embodiment of the present application.
  • step 911 may refer to the prior art.
  • step 911 may refer to the flow shown in FIG. 12 below.
  • the AMF network element releases 3GPP side resources.
  • the AMF network element executes the N2 resource release process to release the 3GPP side resources.
  • the core network can determine and execute session switching according to session-related parameters.
  • the SMF network element is mainly enhanced, and the terminal device may not need to be enhanced, that is, the terminal device can use the existing mechanism to initiate session establishment or send an IP configuration request message.
  • it may be determined by the SMF network element to perform session handover.
  • the SMF network element can master the relevant session parameters of all sessions of the terminal device.
  • the SMF network element can learn that the terminal device is a special terminal device (such as an N5CW device) according to the terminal device's identification and a special session identification (such as the session identification on the trusted WLAN side), and according to the session parameters to be established, learn If it is consistent with or similar to the session-related parameters of the previously established session, it can be determined to execute the session switching process. Furthermore, the SMF network element can send a session switching instruction and a session context identifier corresponding to the session to the AMF network element, so that the process of updating the session context can be performed instead of continuing the process of establishing a new session. For the AMF network element, after receiving the session establishment request message, the session context creation process can be continued according to the existing process. In addition, only after the AMF network element receives the session switching instruction from the SMF network element, the process of updating the session context is executed, which can reduce changes to the existing process.
  • a special terminal device such as an N5CW device
  • a special session identification such as the session identification on the trusted WLAN side
  • FIG. 10 is a schematic flowchart of a session switch applicable to another embodiment of the present application.
  • the method 1000 shown in FIG. 10 can be applied to the solution 2 in the above-mentioned method 500, and the method 1000 can be used in the scenario where session #1 is switched from a non-3GPP access technology to a 3GPP access technology.
  • the method 1000 shown in FIG. 10 may include the following steps.
  • the TWIF network element completes the process of registration and session establishment on behalf of the UE.
  • step 1001 does not limit step 1001, and for step 1001, reference may be made to the prior art, which is not limited.
  • step 1001 may refer to the flow shown in FIG. 12 below.
  • the UE completes the 3GPP side registration process.
  • step 1002 for the specific process for the UE to complete the registration on the 3GPP side, for example, reference may be made to the prior art, which is not limited thereto. As an example, step 1002 may refer to the flow shown in FIG. 13 below.
  • the UE sends a session establishment request message to the AMF network element.
  • the UE When the UE wants to switch the session (such as session #1) on the original trusted WLAN side to the 3GPP access technology, it can send a session establishment request message (such as a PDU session establishment request message) to the AMF network element.
  • a session establishment request message such as a PDU session establishment request message
  • the session establishment request message may include but not limited to one or more of the following: session identifier (such as PDU session ID), request type (request type), data network name requested by the UE (UE requested DNN), slice information (such as S-NSSAI) and other parameters.
  • the session request type is "Initial Request”.
  • the session identifier is session identifier #2, such as a newly generated session identifier for the UE.
  • the AMF network element determines to perform session switching.
  • the AMF network element can determine that the UE is an N5CW device according to the relevant parameters, and determine to perform session handover according to the session parameters.
  • the AMF network element can determine that the UE is an N5CW device. For example, the AMF network element can obtain (or search for) the context information of the UE according to the UE identity, such as finding the session identity #1 of the session before handover (that is, the session established on the trusted WLAN side) in the UE context information. If it is a special value or a fixed value (such as a value of 15), it is determined that the UE is an N5CW device.
  • the AMF network element can determine, according to the relevant parameters of the session to be established, such as data network name, slice information, etc., that the relevant parameters of the session to be established are consistent with or similar to the relevant parameters of the existing session, then the AMF network element Make sure to switch existing sessions.
  • the UE may indicate to the AMF network element that the UE is an N5CW device, and the AMF network element may determine that the UE is an N5CW device according to the UE's instruction.
  • the AMF network element sends an update session context request message to the SMF network element.
  • the AMF network element After the AMF network element determines to perform session switching on the existing session, it sends an update session context request message, such as a Nsmf_PDUSession_UpdateSMContext Request message, to the SMF network element.
  • an update session context request message such as a Nsmf_PDUSession_UpdateSMContext Request message
  • Nsmf_PDUSession_UpdateSMContext Request message is only an exemplary description, and is not limited thereto.
  • the update session context request message may include but not limited to one or more of the following: session switching indication information, session context identifier (SM context ID), access type (access type), access technology Type (RAT type), session identifier.
  • the session switching indication information is used to instruct the session switching, or is used to instruct the execution of the session switching process.
  • the session switching indication can also be specifically used to update the session context to perform session switching; or it is further indicated as the session switching of the N5CW device, and associates session ID #1 and session ID #2 (such as allowing modification or add session ID).
  • This session ID can be used to replace session ID #1 (ie the session ID for sessions established over non-3GPP access technologies).
  • the session ID can be used as a supplementary session ID, that is, allowing two different session IDs to be associated with the same session context information.
  • the SMF network element sends an update session context response message to the AMF network element.
  • the SMF network element After the SMF network element finishes updating the session parameters, it sends an update session context response message, such as the Nsmf_PDUSession_UpdateSMContext Response message, to the AMF network element.
  • an update session context response message such as the Nsmf_PDUSession_UpdateSMContext Response message
  • Nsmf_PDUSession_UpdateSMContext Response message is only an exemplary description, which is not limited thereto.
  • the SMF network element selects the original UPF.
  • the SMF network element selects the same UPF as the session before the handover (that is, the session established through the non-3GPP access technology), so as to ensure that the IP address of the session after the handover is consistent with the IP address of the session before the handover, so that the service can be guaranteed. continuity.
  • the SMF network element sends the IP address of the session before the handover (that is, the session established by the non-3GPP access technology) to the UE through the AMF network element, and sends the CN tunnel information on the UPF side to the RAN through the AMF network element for uplink. data transmission.
  • the RAN sends the AN tunnel information on the RAN side to the UPF through the AMF network element and the SMF network element for downlink data transmission.
  • step 1008 is not limited in this embodiment of the present application.
  • step 1008 may refer to the prior art.
  • step 1008 may refer to the flow shown in FIG. 14 below (eg, steps 1411-1417).
  • the AMF network element releases the trusted WLAN resources.
  • the AMF network element executes the N2 resource release process to release trusted WLAN resources.
  • FIG. 11 is another schematic flowchart of session switching applicable to another embodiment of the present application.
  • the method 1100 shown in FIG. 11 can be applied to the solution 2 in the above-mentioned method 500, and the method 1100 can be used in a scenario where session #1 is switched from a 3GPP access technology to a non-3GPP access technology.
  • the method 1100 shown in FIG. 11 may include the following steps.
  • the UE completes the 3GPP side registration and session establishment procedures.
  • step 1101 may refer to the flow shown in FIG. 13 and FIG. 14 below.
  • the UE completes the trusted WLAN side registration process.
  • step 1102 the UE (such as the N5CW device) completes the specific process of the trusted WLAN side registration, for example, reference may be made to the prior art, which is not limited.
  • step 1102 may refer to the registration process shown in FIG. 12 below.
  • the UE (such as the N5CW device) sends an IP configuration request message to the TWIF network element.
  • the TWIF network element sends a session establishment request message to the AMF network element.
  • the TWIF network element After receiving the IP configuration request message from the UE (such as the N5CW device), the TWIF network element initiates the session establishment process.
  • the TWIF network element sends a session establishment request message (such as a PDU session establishment request message) to the AMF network element.
  • the session establishment request message may include but is not limited to one or more of the following: session identifier (such as PDU session ID), request type (request type), data network name requested by the UE (UE requested DNN), slice information (such as S-NSSAI) and other parameters.
  • the session request type is "Initial Request", which indicates that a new session is to be established.
  • the session identifier is a special value or a fixed value, for example.
  • the AMF network element determines to perform session switching.
  • the AMF network element can determine that the UE is an N5CW device according to the relevant parameters, and determine to perform session handover according to the session parameters.
  • the AMF network element can determine that the UE is an N5CW device. For example, the AMF network element can learn that the UE is an N5CW device according to the session identifier, that is, the session identifier (such as a special value or a fixed value) included in the session establishment request message sent by the TWIF network element. For another example, the AMF network element may learn that the UE is an N5CW device according to the TWIF network element identifier (eg, the global TWIF node identifier).
  • the TWIF network element identifier eg, the global TWIF node identifier
  • the AMF network element may determine, according to the relevant parameters of the session to be established, such as the data network name, slice information, etc., that the relevant parameters of the session to be established are consistent with or similar to the relevant parameters of an existing session , the AMF network element determines to switch the session. Or, the AMF network element determines to switch the session of the UE on the 3GPP side to the non-3GPP side according to the connection state of the UE on the 3GPP side (such as being in an idle state (idle) or poor connection, etc.), and the AMF network element determines the session. to switch.
  • the relevant parameters of the session to be established such as the data network name, slice information, etc.
  • the UE may indicate to the AMF network element that the UE is an N5CW device, and the AMF network element may determine that the UE is an N5CW device according to the UE's instruction.
  • the AMF network element sends an update session context request message to the SMF network element.
  • the AMF network element After the AMF network element determines to perform session switching on the existing session, it sends an update session context request message, such as a Nsmf_PDUSession_UpdateSMContext Request message, to the SMF network element.
  • an update session context request message such as a Nsmf_PDUSession_UpdateSMContext Request message
  • Nsmf_PDUSession_UpdateSMContext Request message is only an exemplary description, and is not limited thereto.
  • the update session context request message may include but not limited to one or more of the following: session switching indication information, session context identifier (SM context ID), access type (access type), access technology Type (RAT type), session identifier.
  • the session switching indication information is used to instruct the session switching, or is used to instruct the execution of the session switching process.
  • the session switch indication can also be specifically used to update the session context to perform the session switch; or it is further indicated as the session switch of the N5CW device, and associates session ID #1 and session ID #2 (such as allowing modification or add session ID).
  • This session ID can be used to replace session ID #1 (ie, the session ID of a session established over a 3GPP access technology).
  • the session ID can be used as a supplementary session ID, that is, allowing two different session IDs to be associated with the same session context information.
  • the SMF network element sends an update session context response message to the AMF network element.
  • the SMF network element After the SMF network element finishes updating the session parameters, it sends an update session context response message, such as the Nsmf_PDUSession_UpdateSMContext Response message, to the AMF network element.
  • an update session context response message such as the Nsmf_PDUSession_UpdateSMContext Response message
  • Nsmf_PDUSession_UpdateSMContext Response message is only an exemplary description, which is not limited thereto.
  • the SMF network element selects the original UPF.
  • the SMF network element selects the same UPF as the session before the handover (that is, the session established through the 3GPP access technology), so as to ensure that the IP address of the session after the handover is consistent with the IP address of the session before the handover, thus ensuring service continuity sex.
  • the session is established.
  • the SMF network element sends the IP address of the session before handover (that is, the session established through the 3GPP access technology) to the TWIF network element through the AMF network element, and sends the CN tunnel information on the UPF side to the TWIF network element through the AMF network element, For upstream data transmission.
  • the TWIF network element sends the AN tunnel information on the RAN side to the UPF through the AMF network element and the SMF network element for downlink data transmission.
  • step 1109 is not limited in this embodiment of the present application.
  • step 1109 may refer to the prior art.
  • step 1109 may refer to the flow shown in FIG. 12 below.
  • the TWIF network element sends an IP configuration response message to the UE (such as an N5CW device).
  • the IP configuration response message includes the IP address of the session.
  • the AMF network element releases 3GPP side resources.
  • the AMF network element executes the N2 resource release process to release the 3GPP side resources.
  • the core network can determine and execute session switching according to session-related parameters.
  • the AMF network element is mainly enhanced, and the terminal device may not need to be enhanced, that is, the terminal device can use the existing mechanism to initiate session establishment or send an IP configuration request message.
  • the AMF network element may determine to perform session handover. The AMF network element not only grasps the basic parameters of the terminal equipment session, but also learns the connection status of the terminal equipment.
  • the AMF network element can learn that the terminal device is a special terminal device (such as an N5CW device) according to the terminal device's identity and a special session identity (such as the session identity on the trusted WLAN side), and can learn that the terminal device is a special terminal device (such as an N5CW device) according to the session parameters to be established. If it is consistent with or similar to the session-related parameters of the previously established session, it can be determined to execute the session switching process. Alternatively, it can also be determined to execute the session switching process according to the poor connection status of the terminal device on the 3GPP side.
  • the AMF network element may directly send a request message for creating a session context (determining not to perform session switching) or sending a requesting message for updating session context (determining to perform session switching) to the SMF network element.
  • the update session context request message is re-sent based on the session switching indication information fed back by the SMF network element, thereby reducing signaling overhead.
  • the AMF network element can learn the connection status of the terminal device on the 3GPP side, so the AMF network element can also be enabled to determine whether to perform session handover according to the connection status.
  • the AMF network element when the AMF network element determines to perform session switching, it can add additional session switching indication information in the update session context request message, so that the SMF network element can know that the session switching is for a special terminal device (such as N5CW device), so that Allows replacement or addition of session IDs.
  • a special terminal device such as N5CW device
  • the above description is mainly based on the case where the UE is a terminal device that does not support NAS signaling when accessing the core network through a non-3GPP access technology, which is not limited thereto.
  • the scenario in which the UE is a terminal device that does not support NAS signaling when accessing the core network through a certain access technology (such as a 3GPP access technology) is similar, and will not be repeated here.
  • any process that can implement the method 400 or the method 500 is applicable to the embodiments of the present application.
  • the following describes a process related to session establishment applicable to this embodiment of the present application with reference to FIG. 12 to FIG. 14 .
  • Figure 12 shows a possible schematic flow chart of the N5CW device registering to access the 5GC and establishing a session.
  • the method 1200 shown in FIG. 12 may include the following steps.
  • the N5CW device selects a PLMN that includes a trusted WLAN.
  • the N5CW device establishes a Layer 2 connection (L2 connection) with the TWAP of the WLAN access network.
  • L2 connection Layer 2 connection
  • the N5CW device is associated with the selected trusted WLAN, and initiates an extensible authentication protocol (EAP) authentication process.
  • EAP extensible authentication protocol
  • the N5CW device sends a network access identity (NAI) to TWAP.
  • NAI network access identity
  • the N5CW device sends NAI to TWAP.
  • TWAP selects a TWIF network element, and sends an authentication authorization auditing (authentication authorization accounting, AAA) request message to the TWIF network element, where the request message includes NAI.
  • AAA authentication authorization accounting
  • TWAP may select a TWIF network element based on the NAI sent by the N5CW device.
  • the NAI contains the subscriber concealed identifier (SUCI). If the N5CW device has accessed the 5GC through the 3GPP access technology before accessing the 5GC through the WLAN, the NAI contains the 5G globally unique temporary identity (5G-GUTI).
  • the 5G-GUTI is allocated by the core network (such as AMF network element) when the N5CW device accesses the 5GC on the 3GPP side as a 5G UE.
  • the core network can map these two identities to the same subscription permanent identifier (SUPI). That is, whether the N5CW device accesses 5GC through trusted WLAN first, or accesses 5GC through 3GPP access technology as a 5G UE, the core network can recognize that they are the same terminal device.
  • SUPI subscription permanent identifier
  • the TWIF network element creates a 5GC registration request message instead of the N5CW device.
  • the parameters of the registration request are generally default parameters, that is, the parameters of the registration request message created by the TWIF network element for all N5CW devices are the same.
  • the request type is "Initial Request”.
  • the TWIF network element selects the AMF network element.
  • the TWIF network element may select an AMF network element according to the NAI, and send an N2 message to the AMF network element.
  • the N2 message includes but is not limited to: registration request, user location and access type.
  • the AMF network element sends an AAA key request (AAA key request) message to the AUSF.
  • AAA key request AAA key request
  • the AMF network element triggers the authentication process, sends a request message to the AUSF, and indicates the access type.
  • an EAP authentication process is initiated between the N5CW device and the AUSF.
  • EAP messages can be encapsulated in NAS messages and sent over the N2 interface.
  • the specific EAP authentication process is not limited in the embodiments of the present application. For example, an existing method may be referred to, or any future method that can implement EAP authentication may be referred to.
  • AAA key response AAA key response
  • the AUSF sends an EAP-success (EAP-success) message and the generated security anchor function (SEAF) key to the AMF network element.
  • EAP-success EAP-success
  • SEAF security anchor function
  • the AMF network element can obtain the access network (AN) key from the received SEAF key.
  • the AMF network element sends a NAS security mode command (security mode command, SMC) to the TWIF network element.
  • NAS security mode command security mode command, SMC
  • the selected NAS security algorithm for complete protection and encryption can be set to empty.
  • the TWIF network element sends the NAS security mode complete (security mode complete) to the AMF network element.
  • the AMF network element may send a context request message to the TWIF network element.
  • the AMF network element sends an N2 initial context setup request (N2 initial context setup request) message to the TWIF network element.
  • N2 initial context setup request N2 initial context setup request
  • the AMF network element may also provide the AN key to the TWIF network element.
  • the TWIF network element obtains the pairwise master key (PMK) from the AN key, and sends PMK and EAP success messages to TWAP, so that TWAP sends an EAP success message to the N5CW device.
  • PMK keys can be used to protect WLAN air interface communications.
  • a Layer 2 or Layer 3 connection is established between the TWAP and the TWIF network element, which is used to transmit the user plane data of the N5CW device to the TWIF network element.
  • the AMF network element sends a registration acceptance message to the TWIF network element.
  • the N5CW device is connected to the WLAN access network and registered with 5GC.
  • steps 1201 to 1212 briefly introduces the possible process of the N5CW device registering and accessing 5GC. It should be understood that the above steps 1201 to 1212 are only exemplary descriptions, and are not limited thereto. The following describes the process of session establishment after the N5CW device registers and accesses the 5GC in conjunction with steps 1213 to 1215.
  • the N5CW device sends an IP configuration request message to the TWIF network element.
  • the TWIF network element sends the session establishment request message to the AMF network element.
  • the TWIF network element When the TWIF network element receives the IP configuration request message sent from the N5CW device, it triggers the TWIF network element to create a PDU session establishment request message, and sends the session establishment request message to the AMF network element.
  • the session establishment request message includes a session identifier (PDU session ID).
  • the session identifier can be a special value or a fixed value, that is, different from the 5G UE when establishing a session, a different session identifier will be generated for each session. Therefore, the session identifier of the special value or fixed value can be distinguished from the session identifier of the session established when the N5CW device is used as a 5G UE.
  • the AMF network element After receiving the PDU session request, the AMF network element interacts with other 5G core network network elements to complete the establishment of the session. For example, refer to steps 1403 to 1411 in FIG. 14 .
  • the AMF network element sends an N2 PDU session request message to the TWIF network element.
  • the AMF network element sends an N2 PDU session request message to the TWIF network element to request to reserve access network resources.
  • the N2 message contains a PDU session establishment accept message.
  • the TWIF network element allocates IP configuration data to the N5CW device.
  • the IP address assigned by the TWIF network element to the N5CW device is the IP address assigned to the PDU session.
  • the TWIF network element may send the user plane data sent by the N5CW device through the Layer 2 or Layer 3 connection to the UPF through the N3 connection.
  • FIG. 13 shows a possible schematic flowchart of the terminal device registration.
  • the method 1300 shown in FIG. 13 may include the following steps.
  • the UE sends a registration request message to the RAN.
  • the registration request message may include, but is not limited to, registration type (registration type) and identification information of the UE.
  • registration type registration type
  • identification information of the UE for example, can be as follows.
  • Initial registration generally used for the registration process initiated when the UE is in the de-registration state.
  • Mobility registration update It is generally used for the registration process that the UE needs to initiate due to movement.
  • Periodic registration update (periodic registration update): generally used for the registration process initiated due to the timeout of the periodic registration update timer when the UE is in the registration state.
  • Emergency registration generally used for the registration process initiated when the UE is in a service-restricted state.
  • the identification information of the UE may be, for example, SUCI or 5G-GUTI or a permanent equipment identifier (PEI).
  • PKI permanent equipment identifier
  • For the identity information of the UE when the UE has a valid 5G-GUTI (a temporary identity, allocated by the AMF network element serving it), the 5G-GUTI is carried in the registration request, so that the network side can use the 5G-GUTI according to the 5G-GUTI. Find the AMF network element that served the UE before to obtain relevant context information. If the UE does not have a valid 5G-GUTI, it will carry SUCI. In emergency registration, if the UE has no valid 5G-GUTI and no SUPI (ie, no SUCI, SUCI is an encrypted SUPI), the PEI is carried.
  • the RAN selects an appropriate AMF network element.
  • the RAN sends a registration request message to the AMF network element.
  • the RAN sends the registration request message sent by the UE to the AMF network element.
  • the AMF network element selects the AUSF.
  • the AMF network element selects the appropriate AUSF to perform security procedures such as authentication.
  • the UE, AMF network element, AUSF, and UDM interact to complete security procedures such as authentication.
  • the AMF network element sends a registration acceptance message to the UE.
  • the AMF network element sends a NAS message to the UE.
  • FIG. 14 shows a possible schematic flowchart of session establishment of the terminal device.
  • the method 1400 shown in FIG. 14 may include the following steps.
  • the UE sends a PDU session establishment request message to the AMF network element.
  • the PDU session establishment request message is a NAS message.
  • the PDU session establishment request message may include but not limited to: PDU session identifier, request type (request type), data network name (UE requested DNN) requested by the UE, slice information (such as S-NSSAI) and other parameters.
  • request type for example, can be as follows.
  • initial request When the request type is "initial request", it is generally used to indicate that the session establishment request message is used to request the establishment of a new session. At this time, the session ID in the message should be the session ID newly generated by the UE, that is, it should be the same as the current session ID. The session IDs of the established sessions are different.
  • the request type is "existing PDU session"
  • it is generally used to indicate that the session establishment request message is used to request to switch a currently established session (that is, an existing session or an existing session), such as from a 3GPP connection. switch from a non-3GPP access technology to a non-3GPP access technology, or switch from a non-3GPP access technology to a 3GPP access technology, or switch a currently established 4G packet data network (PDN) connection to 5G.
  • the session ID is generally the session ID of a currently established session, indicating that the session is to be switched.
  • Emergency request When the request type is "emergency request", it is generally used to indicate that the session establishment request message is used to request the establishment of a PDU session for emergency services.
  • the AMF network element selects a suitable SMF network element.
  • the AMF network element sends a PDU session creation session context request message to the SMF network element.
  • the PDU session creation session context request message may include, but is not limited to, carry parameters such as the UE identifier (eg SUPI), the DNN requested by the UE, and the PDU session identifier.
  • the SMF network element obtains session management subscription data from the UDM.
  • the SMF network element feeds back a PDU session creation session context response message to the AMF network element.
  • the PCF formulates a policy and charging control (policy and charging control, PCC) rule.
  • policy and charging control PCC
  • the SMF network element selects a PCF and establishes a session policy association with the PCF.
  • a rule represents a policy information element related to a PDU session or a service data flow, for which reference may be made to the existing description, which is not limited here.
  • the SMF network element selects an appropriate UPF.
  • the SMF network element initiates a session policy association modification to the PCF.
  • the SMF network element may send the IP address allocated for the UE to the PCF.
  • the SMF network element establishes an N4 connection with the UPF.
  • the SMF network element sends an N1N2 message to the AMF network element.
  • the message may include, but is not limited to: session identifier, N2 interface session management (session management, SM) information (N2 SM information), and N1 interface session management container (N1 SM container) and other information.
  • session management session management
  • N2 SM information N2 interface session management information
  • N1 SM container N1 interface session management container
  • the N2 SM information may be sent by the SMF network element to the RAN through the AMF network element.
  • the N2 SM information may include information such as the tunnel endpoint identifier of the UPF. By sending this information to the RAN, the RAN can be informed of how to send uplink data.
  • the information in the N1 SM container can be sent by the SMF network element to the UE through the AMF network element (the subsequent AMF network element is sent to the UE through the NAS message).
  • the N1 SM Container may contain a PDU session establishment accept (PDU session establishment accept) message and other session-related parameter information.
  • the AMF network element sends an N2 PDU session request message to the RAN.
  • the N2 PDU session request message may include, but is not limited to: N2 SM information, a NAS message that needs to be sent to the UE.
  • the NAS message may include the session identifier and the N1 SM container.
  • the RAN establishes air interface resources with the UE.
  • the RAN establishes air interface resources with the UE, and the RAN sends the NAS message to the UE.
  • the NAS message may carry a PDU session establishment accept message.
  • the RAN sends an N2 PDU session response message to the AMF network element.
  • the N2 PDU session response message can carry the tunnel endpoint identifier on the RAN side, which can be sent to the UPF later via the AMF network element and the SMF network element. By sending this information to the UPF, the UPF can be made to know how to send downlink data.
  • the AMF network element sends a PDU session update session context request message to the SMF network element.
  • the AMF network element sends the message sent by the RAN to the SMF network element through a PDU session update session context request.
  • the SMF network element sends the RAN side AN tunnel endpoint identification information to the UPF.
  • the SMF network element may send the AN tunnel endpoint identification information on the RAN side to the UPF through the N4 session modification process.
  • the SMF network element sends a PDU session update session context response message to the AMF network element.
  • the terminal equipment does not support NAS signaling when accessing the core network through a non-3GPP access technology as an example for illustration, but this does not limit the present application.
  • the terminal device does not support NAS signaling when accessing the core network through a certain access technology (eg, the first access technology or the second access technology)
  • the solutions provided by the embodiments of the present application can be used.
  • the technology for the terminal to access the communication device is recorded as an access technology, and it should be understood that the naming does not limit the protection scope of the embodiments of the present application.
  • the access technology can also be replaced by the access standard.
  • the methods and operations implemented by the terminal device can also be implemented by components (such as chips or circuits) that can be used in the terminal device, and the methods and operations implemented by the network device can also be implemented by A component (eg, chip or circuit) implementation that can be used in a network device.
  • components such as chips or circuits
  • a component eg, chip or circuit
  • FIG. 15 is a schematic block diagram of an apparatus for session switching provided by an embodiment of the present application.
  • the apparatus 1500 includes a transceiver unit 1510 and a processing unit 1520 .
  • the transceiver unit 1510 can implement corresponding communication functions, and the processing unit 1520 is used for data processing.
  • the transceiver unit 1510 may also be a communication interface or a communication unit.
  • the apparatus 1500 may further include a storage unit, which may be used to store instructions and/or data, and the processing unit 1520 may read the instructions and/or data in the storage unit, so that the apparatus implements the foregoing Method Examples.
  • a storage unit which may be used to store instructions and/or data
  • the processing unit 1520 may read the instructions and/or data in the storage unit, so that the apparatus implements the foregoing Method Examples.
  • the apparatus 1500 may be configured to perform the actions performed by the terminal device in the above method embodiments.
  • the apparatus 1500 may be a terminal device or a component that can be configured in the terminal device, and the transceiver unit 1510 is configured to perform the above method embodiments.
  • the processing unit 1520 is configured to perform the operations related to the processing on the terminal device side in the above method embodiments.
  • the apparatus 1500 may also be used to perform the actions performed by the network equipment in the above method embodiments.
  • the apparatus 1500 may be a network equipment or a component that can be configured in the network equipment, and the transceiver unit 1510 is used to perform the above method implementation.
  • the processing unit 1520 is configured to perform the operations related to the processing on the network device side in the above method embodiments.
  • the apparatus 1500 is configured to perform the actions performed by the network equipment (eg, AMF network element or TWIF network element) in the above method embodiments.
  • the network equipment eg, AMF network element or TWIF network element
  • the transceiver unit 1510 is configured to receive first indication information from the terminal device, where the first indication information is used to instruct to switch the session of the terminal device, and the session is a session established through the first access technology; the processing unit 1520, configured to determine that the terminal device is a terminal device that does not support non-access stratum NAS signaling when accessing the core network through the first access technology or through the second access technology; the processing unit 1520 is further configured to execute the session from the first Handover from one access technology to a second access technology.
  • the first access technology is a non-3rd Generation Partnership Project N3GPP access technology
  • the second access technology is a 3GPP access technology
  • the transceiver unit 1510 is further configured to acquire the context information of the terminal device according to the identification information of the terminal device; the processing unit 1520 is specifically configured to determine, according to the first identification information of the session in the context information, that the terminal device has passed the first identification information.
  • the processing unit 1520 is specifically configured to determine the identification information of the access network device according to the identification information of the terminal device, and the access network device is the access network device corresponding to the first access technology;
  • the identification information determines that the terminal device is a terminal device that does not support NAS signaling when accessing the core network through the first access technology.
  • the access network device includes a trusted wireless local area network interoperability function TWIF network element.
  • the transceiver unit 1510 is further configured to receive second indication information from the terminal device, where the second indication information is used to indicate that the terminal device is not connected to the core network through the first access technology or through the second access technology.
  • the processing unit 1520 is specifically configured to determine, according to the second indication information, that the terminal device is a terminal device that does not support NAS signaling when accessing the core network through the first access technology.
  • the transceiver unit 1510 is specifically configured to receive a request message sent by the terminal device through the second access technology, where the request message is used to request the establishment of a session through the second access technology, and the request message includes the first indication information and the first indication of the session.
  • the processing unit 1520 is specifically configured to determine, according to the second identification information of the session, that the terminal device that needs to be determined is a terminal device that does not support NAS signaling when accessing the core network through the first access technology.
  • the second identification information of the session includes: a null value or an identification generated by the terminal device.
  • the network device is the first core network element
  • the transceiver unit 1510 is further configured to send the second identification information of the session and the third indication information to the second core network element, and the third indication information is used for the associated session. first identification information and second identification information.
  • the first indication information includes: the session is an existing session.
  • the first identification information of the session is the session identification when the session is established through the first access technology.
  • the apparatus 1500 is an AMF network element.
  • the transceiver unit 1510 is configured to receive indication information from the terminal device and/or the first identification information of the session, the indication information is used to instruct to switch the session of the terminal device, and the session is performed through the first access technology.
  • the established session the terminal device is a terminal device that does not support non-access stratum NAS signaling when accessing the core network through the second access technology, and the first identification information of the session includes the session identification when the session was established through the first access technology ;
  • a processing unit 1520 configured to determine to switch the session from the first access technology to the second access technology according to the indication information and/or the first identification information of the session.
  • the transceiver unit 1510 is further configured to send the request type, and the first identification information of the session and/or the second identification information of the session to the core network element, wherein the request type is used to indicate session switching, the second identification information of the session
  • the identification information includes the session identification when the session is established through the second access technology.
  • the transceiver unit 1510 is specifically configured to receive a request message from a terminal device, where the request message includes indication information and/or first identification information of a session.
  • the apparatus 1500 is a trusted wireless local area network interoperability function TWIF network element.
  • the first access technology is a 3rd Generation Partnership Project 3GPP access technology
  • the second access technology is a non-3rd Generation Partnership Project N3GPP access technology.
  • the apparatus 1500 may implement steps or processes corresponding to those performed by the network device in the method embodiments according to the embodiments of the present application, and the apparatus 1500 may include a unit for performing the method performed by the network device in FIG. 4 to FIG. 14 . Moreover, the units in the apparatus 1500 and the other operations and/or functions mentioned above are respectively for implementing the corresponding processes of the method embodiments in the network device in FIG. 4 to FIG. 14 .
  • the transceiver unit 1510 can be used to execute step 410 of the method 400 ; the processing unit 1520 can be used to execute the processing steps of the method 400 , such as steps 420 and 430 .
  • the transceiver unit 1510 can be used to execute step 510 of the method 500 ; the processing unit 1520 can be used to execute the processing steps of the method 500 , such as steps 520 - 540 .
  • the transceiver unit 1510 can be used to execute steps 603, 605, 606-607 in the method 600; the processing unit 1520 can be used to execute the processing steps in the method 600, Process steps as in step 604 .
  • the transceiver unit 1510 can be used to execute steps 703 and 705 in the method 700 ; the processing unit 1520 can be used to execute the processing steps in the method 700 , such as in step 704 processing steps.
  • the transceiver unit 1510 can be used to execute steps 804, 806-808, and 810 in the method 800; the processing unit 1520 can be used to execute the processing steps in the method 800, Such as steps 805 and 809.
  • the transceiver unit 1510 can be used to execute steps 905 , 907 - 909 and 910 in the method 900 ; the processing unit 1520 can be used to execute the processing steps in the method 900 , Such as steps 906, 910.
  • the transceiver unit 1510 can be used to execute steps 1001 , 1002 , 1003 , 1005 , 1006 and 1008 in the method 1000 ; the processing unit 1520 can be used to execute the method 1000 processing steps, such as step 1004.
  • the transceiver unit 1510 can be used to execute steps 1101 , 1104 , 1106 , 1107 , and 1109 in the method 1100 ; the processing unit 1520 can be used to execute the processing in the method 1100 . steps, such as step 1105.
  • the apparatus 1500 is configured to perform the actions performed by the terminal device in the above method embodiments.
  • the processing unit 1520 is configured to establish a session through the first access technology; the transceiver unit 1510 is configured to send first indication information to the network device, where the first indication information is used to instruct the session to be switched; wherein, the terminal The device is a terminal device that does not support non-access stratum NAS signaling when accessing the core network through the first access technology or through the second access technology, and the session is switched from the first access technology to the second access technology.
  • the transceiver unit 1510 is further configured to send second indication information to the network device, where the second indication information is used to indicate that the terminal device does not support the access to the core network through the first access technology or through the second access technology.
  • Terminal equipment for NAS signaling Terminal equipment for NAS signaling.
  • the terminal device is a terminal device that does not support NAS signaling when accessing the core network through the first access technology, and the first indication information includes: the session is an existing session.
  • the transceiver unit 1510 is further configured to send the first identification information of the session or the second identification information of the session to the network device.
  • the first identification information of the session is a session identification when the session is established through the first access technology
  • the second identification information of the session includes: a null value or an identification generated by a terminal device.
  • the terminal device is a terminal device that does not support NAS signaling when accessing the core network through the first access technology
  • the transceiver unit 1510 is further configured to receive the first identification information of the session from the access network device, and the access network The device is an access network device corresponding to the first access technology.
  • the transceiver unit 1510 is specifically configured to send a request message to the network device through the second access technology, where the request message is used to request to establish a session through the second access technology, and the request message includes the first indication information.
  • the apparatus 1500 may implement steps or processes corresponding to those performed by the terminal equipment in the method embodiments according to the embodiments of the present application, and the apparatus 1500 may include a unit for performing the methods performed by the terminal equipment in FIG. 4 to FIG. 14 . Moreover, each unit in the apparatus 1500 and the other operations and/or functions mentioned above are respectively for implementing the corresponding processes of the method embodiments in the terminal device in FIG. 4 to FIG. 14 .
  • the transceiver unit 1510 can be used to execute the step 410 of the method 400 ; the processing unit 1520 can be used to execute the processing steps of the method 400 .
  • the transceiver unit 1510 can be used to execute the step 510 of the method 500 ; the processing unit 1520 can be used to execute the processing steps of the method 500 .
  • the transceiver unit 1510 can be used to perform steps 601 , 602 , 603 , 605 and 609 in the method 600 ; the processing unit 1520 can be used to perform the processing in the method 600 . steps, such as the processing steps in steps 601 , 602 and 609 .
  • the transceiver unit 1510 can be used to execute steps 701 , 702 , 703 and 710 in the method 700 ; the processing unit 1520 can be used to execute the processing steps in the method 700 , Such as the processing steps in steps 701 and 702 .
  • the processing unit 1520 in the above embodiments may be implemented by at least one processor or processor-related circuits.
  • the transceiver unit 1510 may be implemented by a transceiver or a transceiver-related circuit.
  • the storage unit may be implemented by at least one memory.
  • an embodiment of the present application further provides an apparatus 1600 for session switching.
  • the apparatus 1600 includes a processor 1610 coupled to a memory 1620 for storing computer programs or instructions and/or data, and the processor 1610 for executing the computer programs or instructions and/or data stored in the memory 1620 such that The methods in the above method embodiments are performed.
  • the apparatus 1600 includes one or more processors 1610 .
  • the apparatus 1600 may further include a memory 1620 .
  • the device 1600 may include one or more memories 1620 .
  • the memory 1620 may be integrated with the processor 1610, or separately provided.
  • the apparatus 1600 may further include a transceiver 1630, and the transceiver 1630 is used for signal reception and/or transmission.
  • the processor 1610 is used to control the transceiver 1630 to receive and/or transmit signals.
  • the apparatus 1600 is configured to implement the operations performed by the terminal device in the above method embodiments.
  • the processor 1610 is configured to implement the processing-related operations performed by the terminal device in the above method embodiments
  • the transceiver 1630 is configured to implement the transceiving-related operations performed by the terminal device in the above method embodiments.
  • the apparatus 1600 is configured to implement the operations performed by the network device in the above method embodiments.
  • the processor 1610 is configured to implement the processing-related operations performed by the AMF network element in the above method embodiments
  • the transceiver 1630 is configured to implement the above-mentioned method embodiments performed by the AMF network element.
  • the processor 1610 is configured to implement the processing-related operations performed by the SMF network element in the above method embodiments
  • the transceiver 1630 is configured to implement the above-mentioned method embodiments performed by the SMF network element.
  • the processor 1610 is configured to implement the processing-related operations performed by the TWIF network element in the above method embodiments
  • the transceiver 1630 is configured to implement the above-mentioned method embodiments performed by the TWIF network element.
  • An embodiment of the present application further provides a communication apparatus 1700, where the communication apparatus 1700 may be a terminal device or a chip used in the terminal device.
  • the communication apparatus 1700 may be used to perform the operations performed by the terminal device in the foregoing method embodiments.
  • FIG. 17 shows a schematic structural diagram of a simplified terminal device.
  • the terminal device includes a processor, a memory, a radio frequency circuit, an antenna, and an input and output device.
  • the processor is mainly used to process communication protocols and communication data, control terminal equipment, execute software programs, and process data of software programs.
  • the memory is mainly used to store software programs and data.
  • the radio frequency circuit is mainly used for the conversion of the baseband signal and the radio frequency signal and the processing of the radio frequency signal.
  • Antennas are mainly used to send and receive radio frequency signals in the form of electromagnetic waves.
  • Input and output devices such as touch screens, display screens, and keyboards, are mainly used to receive data input by users and output data to users. It should be noted that some types of terminal equipment may not have input and output devices.
  • the processor When data needs to be sent, the processor performs baseband processing on the data to be sent, and outputs the baseband signal to the radio frequency circuit.
  • the radio frequency circuit performs radio frequency processing on the baseband signal and sends the radio frequency signal through the antenna in the form of electromagnetic waves.
  • the radio frequency circuit receives the radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor, which converts the baseband signal into data and processes the data.
  • the memory may also be referred to as a storage medium or a storage device or the like.
  • the memory may be set independently of the processor, or may be integrated with the processor, which is not limited in this embodiment of the present application.
  • the antenna and the radio frequency circuit with a transceiver function may be regarded as a transceiver unit of the terminal device, and the processor with a processing function may be regarded as a processing unit of the terminal device.
  • the terminal device includes a transceiver unit 1710 and a processing unit 1720 .
  • the transceiver unit 1710 includes a transceiver, a transceiver, a transceiver, and the like.
  • the processing unit 1720 may also be referred to as a processor, a processing board, a processing module, a processing device, and the like.
  • the device used for implementing the receiving function in the transceiver unit 1710 may be regarded as a receiving unit, and the device used for implementing the transmitting function in the transceiver unit 1710 may be regarded as a sending unit, that is, the transceiver unit 1710 includes a receiving unit and a sending unit. sending unit.
  • the transceiver unit may also sometimes be referred to as a transceiver, a transceiver, or a transceiver circuit.
  • the receiving unit may also sometimes be referred to as a receiver, receiver, or receiving circuit, or the like.
  • the transmitting unit may also sometimes be referred to as a transmitter, a transmitter, or a transmitting circuit, or the like.
  • FIG. 17 is only an example and not a limitation, and the above-mentioned terminal device including a transceiver unit and a processing unit may not depend on the structure shown in FIG. 17 .
  • This embodiment of the present application further provides a communication apparatus 1800, where the communication apparatus 1800 may be a chip or a chip system.
  • the communication apparatus 1800 includes a processor 1810, and the processor may be a processor integrated on the chip or a microprocessor or an integrated circuit.
  • the communication apparatus 1800 may further include a communication interface 1820, and the communication interface may also be an input and output circuit.
  • the communication apparatus 1800 is a chip system or a processing system, the device on which the communication apparatus 1800 is installed can implement the methods and functions of the embodiments of the present application.
  • the processor 1810 can be a processing circuit in a chip system or a processing system, and can control the device on which the chip system or processing system is installed, and can also be coupled to a storage unit to call instructions in the storage unit, so that the device can implement
  • the communication interface 1820 may be an input/output circuit in a chip system or a processing system, which outputs information processed by the chip system, or inputs data or signaling information to be processed into the chip system for processing. .
  • the apparatus 1800 is configured to implement the operations performed by the terminal device in the above method embodiments.
  • the processor 1810 is configured to implement the processing-related operations performed by the terminal device in the above method embodiments
  • the communication interface 1820 is configured to implement the above-mentioned method embodiments performed by the terminal device.
  • the apparatus 1800 is configured to implement the operations performed by the network device in the above method embodiments.
  • the processor 1810 is configured to implement the processing-related operations performed by the AMF network element in the above method embodiments
  • the communication interface 1820 is configured to implement the above-mentioned method embodiments performed by the AMF network element.
  • the processor 1810 is configured to implement the processing-related operations performed by the SMF network element in the above method embodiments
  • the communication interface 1820 is configured to implement the above-mentioned method embodiments performed by the SMF network element.
  • the processor 1810 is configured to implement the processing-related operations performed by the TWIF network element in the above method embodiments
  • the communication interface 1820 is configured to implement the above-mentioned method embodiments performed by the TWIF network element.
  • Embodiments of the present application further provide a computer-readable storage medium, on which computer instructions for implementing the method executed by the network device or the terminal device in the foregoing method embodiments are stored.
  • the computer program when executed by a computer, the computer can implement the method executed by the network device in the above method embodiments.
  • the computer when the computer program is executed by a computer, the computer can implement the method executed by the network terminal device in the above method embodiments.
  • Embodiments of the present application further provide a computer program product including instructions, which, when executed by a computer, enable the computer to implement the method executed by a network device or a terminal device in the above method embodiments.
  • An embodiment of the present application further provides a communication system, where the communication system includes the network device in the above embodiment, or a network device and a terminal device.
  • the communication system includes the AMF network element and the SMF network element in the above embodiments, such as the AMF network element and the SMF network element in the embodiments shown in FIG. 4 , FIG. 8 to FIG. 11 .
  • the communication system includes the AMF network element and the TWIF network element in the above embodiment, such as the AMF network element and the TWIF network element in the embodiment shown in FIG. 7 .
  • processors mentioned in the embodiments of the present application may be a central processing unit (central processing unit, CPU), and may also be other general-purpose processors, digital signal processors (digital signal processors, DSP), application-specific integrated circuits ( application specific integrated circuit, ASIC), off-the-shelf programmable gate array (field programmable gate array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.
  • a general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
  • the memory mentioned in the embodiments of the present application may be a volatile memory and/or a non-volatile memory.
  • the non-volatile memory may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically programmable Erase programmable read-only memory (electrically EPROM, EEPROM) or flash memory.
  • Volatile memory may be random access memory (RAM).
  • RAM can be used as an external cache.
  • RAM may include the following forms: static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM) , double data rate synchronous dynamic random access memory (double data rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, ESDRAM), synchronous link dynamic random access memory (synchlink DRAM, SLDRAM) and Direct memory bus random access memory (direct rambus RAM, DR RAM).
  • SRAM static random access memory
  • DRAM dynamic random access memory
  • SDRAM synchronous dynamic random access memory
  • SDRAM double data rate synchronous dynamic random access memory
  • ESDRAM enhanced synchronous dynamic random access memory
  • SLDRAM synchronous link dynamic random access memory
  • Direct memory bus random access memory direct rambus RAM, DR RAM
  • the processor is a general-purpose processor, DSP, ASIC, FPGA or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components
  • the memory storage module
  • memory described herein is intended to include, but not be limited to, these and any other suitable types of memory.
  • the disclosed apparatus and method may be implemented in other manners.
  • the apparatus embodiments described above are only illustrative.
  • the division of the units is only a logical function division. In actual implementation, there may be other division methods.
  • multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not implemented.
  • the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, which may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to implement the solution provided in this application.
  • each functional unit in each embodiment of the present application may be integrated into one unit, or each unit may exist physically alone, or two or more units may be integrated into one unit.
  • the computer may be implemented in whole or in part by software, hardware, firmware or any combination thereof.
  • software it can be implemented in whole or in part in the form of a computer program product.
  • the computer program product includes one or more computer instructions.
  • the computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable device.
  • the computer may be a personal computer, a server, or a network device or the like.
  • the computer instructions may be stored in or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions may be downloaded from a website site, computer, server or data center Transmission to another website site, computer, server, or data center is by wire (eg, coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (eg, infrared, wireless, microwave, etc.).
  • the computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that includes an integration of one or more available media.
  • the usable media may be magnetic media (eg, floppy disks, hard disks, magnetic tapes), optical media (eg, DVDs), or semiconductor media (eg, solid state disks (SSDs), etc.
  • the aforementioned usable media may include But not limited to: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), magnetic disk or optical disk and other media that can store program codes.

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Abstract

L'invention concerne un procédé et un appareil de commutation de session. Le procédé comprend les étapes suivantes : un dispositif terminal envoie des premières informations d'instruction à un dispositif réseau, les premières informations d'instruction servant à demander la commutation d'une session du dispositif terminal, la session étant une session établie par le dispositif terminal au moyen d'une première technologie d'accès ; après que le dispositif réseau a déterminé que le dispositif terminal est un dispositif qui ne prend pas en charge une signalisation NAS lors de l'accès à un réseau central au moyen de la première technologie d'accès ou au moyen d'une seconde technologie d'accès, le dispositif réseau effectue, selon les premières informations d'instruction, une commutation de la session depuis la première technologie d'accès vers la seconde technologie d'accès. Au moyen du procédé, une session d'un dispositif terminal qui ne prend pas en charge une signalisation NAS lors de l'accès à un réseau central peut être activée pour être commutée entre différentes technologies d'accès.
PCT/CN2022/081363 2021-03-24 2022-03-17 Procédé et appareil de commutation de session WO2022199451A1 (fr)

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CN116321328A (zh) * 2021-12-20 2023-06-23 华为技术有限公司 会话切换的方法和装置
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