[go: up one dir, main page]

WO2019096286A1 - 会话建立方法和装置 - Google Patents

会话建立方法和装置 Download PDF

Info

Publication number
WO2019096286A1
WO2019096286A1 PCT/CN2018/116064 CN2018116064W WO2019096286A1 WO 2019096286 A1 WO2019096286 A1 WO 2019096286A1 CN 2018116064 W CN2018116064 W CN 2018116064W WO 2019096286 A1 WO2019096286 A1 WO 2019096286A1
Authority
WO
WIPO (PCT)
Prior art keywords
network
pdn connection
switched
network slice
terminal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2018/116064
Other languages
English (en)
French (fr)
Inventor
宗在峰
朱奋勤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huawei Technologies Co Ltd
Original Assignee
Huawei Technologies Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to KR1020207017559A priority Critical patent/KR102348103B1/ko
Priority to EP23180019.4A priority patent/EP4297499A3/en
Priority to EP21162574.4A priority patent/EP3902326B1/en
Priority to EP18878075.3A priority patent/EP3557906B1/en
Priority to CN201880074532.6A priority patent/CN111684834B/zh
Priority to BR112020009803-5A priority patent/BR112020009803A2/pt
Priority to RU2020119392A priority patent/RU2776778C2/ru
Priority to KR1020227000102A priority patent/KR102475693B1/ko
Priority to AU2018366776A priority patent/AU2018366776B2/en
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to CN202511157262.3A priority patent/CN121218275A/zh
Priority to JP2020526870A priority patent/JP7046180B2/ja
Publication of WO2019096286A1 publication Critical patent/WO2019096286A1/zh
Priority to US16/427,990 priority patent/US10834209B2/en
Anticipated expiration legal-status Critical
Priority to US17/074,897 priority patent/US11533375B2/en
Priority to US18/075,981 priority patent/US11870856B2/en
Ceased legal-status Critical Current

Links

Images

Classifications

    • 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
    • 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
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0066—Transmission or use of information for re-establishing the radio link of control information between different types of networks in order to establish a new radio link in the target network
    • 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
    • H04W36/0027—Control or signalling for completing the hand-off for data sessions of end-to-end connection for a plurality of data sessions of end-to-end connections, e.g. multi-call or multi-bearer end-to-end data connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/14—Session management
    • H04L67/146—Markers for unambiguous identification of a particular session, e.g. session cookie or URL-encoding
    • 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
    • H04W36/0005—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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0022—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
    • H04W36/00222—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies between different packet switched [PS] network technologies, e.g. transferring data sessions between LTE and WLAN or LTE and 5G
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H04W36/144—Reselecting a network or an air interface over a different radio air interface technology
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W60/00—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
    • H04W60/04—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration using triggered events
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems

Definitions

  • the present application relates to the field of communications technologies, and in particular, to a session establishment method and apparatus.
  • the fifth generation (Fifth Generation, 5G) mobile communication technology came into being.
  • the coverage of the 5G network is insufficient. Therefore, when the location of the user equipment (User Equipment, UE) changes, the handover between the 5G network and the fourth generation (4G) network may occur.
  • UE User Equipment
  • a network slice is a network that is used to support logical isolation of specific network capabilities and network characteristics. It can be end-to-end (E2E) including the entire network, or part of the network function in multiple network slices. Sharing is a key technology to meet the needs of 5G mobile communication technology for network differentiation.
  • the network slice may be specifically characterized by network slice selection assistance information (NSSAI).
  • NSSAI network slice selection assistance information
  • the terminal accesses the 5G core network (5GC)
  • the terminal provides the requested NSSAI
  • the network selects the terminal according to the NSSAI.
  • Corresponding network slicing, and the network determines the NSSAI that the terminal is allowed to access according to the NSSAI requested by the terminal, that is, Allowed NSSAI.
  • each packet data network (PDN) connection corresponds to an access point name (APN).
  • APN access point name
  • DNN data network name
  • S-NSSAI single NSSAI
  • the APN is used, It may be equivalent to the DNN, but when the terminal switches from the 4G network to the 5GC supporting the network slice, how to determine the S-NSSAI of the network slice corresponding to the PDN connection established by the terminal in the 4G network, so that it can be determined according to the determination
  • the S-NSSAI establishes a PDU session in the 5GC network slice, and there is currently no related solution.
  • the embodiment of the present application provides a session establishment method and apparatus, so that an established PDN connection is switched to a network slice in a 5G network when the terminal switches across systems.
  • the embodiment of the present application provides the following technical solutions:
  • a method for establishing a session comprising: receiving, by a terminal, an established packet data network from a control plane function entity, a PDN connection corresponding to network slice information when switching to a 5G network; and the established PDN connection switch
  • Corresponding network slice information to the 5G network includes single network slice selection assistance information S-NSSAI of the corresponding network slice when the established PDN connection is switched to the 5G network; and a packet data unit PDU session establishment request, where
  • the PDU session establishment request includes an S-NSSAI corresponding to the network slice when the first PDN connection is switched to the 5G network, and a corresponding data network name DNN when the first PDN connection is switched to the 5G network; the first PDN connection is the Any one of the established PDN connections.
  • the terminal establishes one or more PDN connections through one or more control plane functional entities in the 4G network.
  • the S-NSSAI of the corresponding network slice when the first PDN connection is switched to the 5G network is the network slice received by the terminal from the control plane function entity.
  • S-NSSAI When the terminal is in a non-roaming or local breakout (LBO) roaming scenario, the S-NSSAI of the corresponding network slice when the first PDN connection is switched to the 5G network is the network slice received by the terminal from the control plane function entity.
  • the S-NSSAI of the corresponding network slice when the first PDN connection is switched to the 5G network is the S-NSSAI of the visited network slice.
  • the method further includes: receiving, by the terminal according to the mapping relationship between the S-NSSAI of the home network slice and the S-NSSAI of the visited network slice, the terminal receives the information from the control plane function entity.
  • the corresponding network slice information is mapped to the S-NSSAI of the visited network slice.
  • the control plane function entity sends the corresponding network slice information to the terminal when the established PDN connection is switched to the 5G network, so that when the terminal switches to the 5G network, the PDU session can be established in the 5G network slice according to the corresponding network slice information.
  • the corresponding network slice information is carried in the protocol configuration item PCO message.
  • the control plane function entity sends the corresponding network slice information to the terminal when the PDN message is switched to the 5G network through the PCO message, and the specific PCO message can pass the Mobility Management Entity (MME) in the 4G network and The base station sends to the terminal.
  • MME Mobility Management Entity
  • the PCO message is used to deliver the corresponding network slice information when the PDN connection of the established packet data network is switched to the 5G network, so that the MME can transparently transmit the message without saving the message.
  • the terminal further receives indication information from the control plane function entity, where the indication information is used to indicate that the network slice information received from the control plane function entity is a home network slice. information.
  • the terminal switches the PDN connection requesting the handover to the corresponding home network according to the mapping relationship between the S-NSSAI of the home network slice and the S-NSSAI of the network slice of the visited network.
  • the sliced S-NSSAI is mapped to the S-NSSAI of the visited visited network slice when the PDN connection requesting the handover is switched to the 5G, and then the S-NSSAI of the corresponding visited network slice is carried when the PDN connection requesting the handover is switched to 5G.
  • a PDU session is established by triggering the network.
  • the corresponding network slice information when the established PDN connection is switched to the 5G network further includes an identifier NSI-ID of the network slice instance corresponding to the established PDN connection when the PDN connection is switched to the 5G network.
  • the corresponding network slice information is included in the corresponding network slice information when the PDN connection sent by the control plane function entity to the terminal is switched to the 5G network, thereby ensuring Session continuity after PDN connection switching.
  • the method before the terminal receives the corresponding network slice information when the PDN connection of the established packet data network from the control plane function entity is switched to the 5G network, the method further includes: the terminal The control plane function entity sends a capability indication, where the capability indication is used to indicate that the terminal can switch to a 5G network.
  • the capability indication is used to indicate that the terminal can switch to a 5G network.
  • not all terminals need to receive the corresponding network slice information when the established PDN connection is switched to the 5G network after establishing the PDN connection in the 4G network, for example, a terminal that does not support the 5G network communication capability, even if received This information cannot be used to switch to a 5G network.
  • the method further includes: the terminal determining, in the established PDN connection, a handover to a PDN connection in a 5G network, where the first PDN connection is The switch can switch to any one of the 5G PDN connections.
  • the terminal determines that the PDN connection can be switched to the PDN connection in the established PDN connection, and the method includes: the terminal sends a registration request, where the registration request includes a PDN connection that the terminal requests to switch to when switching to the 5G network.
  • Network slice information wherein the terminal requests the switched PDN connection to be part or all of the PDN connection of the established PDN connection; receiving a registration response, the registration response including the network slice allowed by the terminal to access S-NSSAI; determining, according to the S-NSSAI corresponding to the handover of the PDN connection to the 5G network, and the S-NSSAI of the network slice allowed to access, determining that the PDN connection can be switched to the 5G network.
  • the corresponding network slice information when the terminal requests the switched PDN connection to switch to the 5G network is that the terminal receives from the control plane function entity. Network slice information to.
  • the method further includes: performing, by the terminal, the network slice sent by the control plane function entity according to the mapping relationship between the S-NSSAI of the home network slice and the S-NSSAI of the visited network slice. The information is mapped to the network slice information of the visited place.
  • a method for establishing a session includes: the control plane function entity sends, by using an MME, the network slice information corresponding to the PDN connection of the established packet data network to the terminal when the PDN connection is switched to the 5G network; the established PDN connection Corresponding network slice information when switching to the 5G network includes single network slice selection assistance information S-NSSAI of the network slice corresponding to the established PDN connection; and a packet data unit PDU session establishment request sent by the terminal through the AMF, where The PDU session establishment request includes an S-NSSAI of the network slice corresponding to the first PDN connection and a corresponding data network name DNN when the first PDN connection is switched to the 5G network; the first PDN connection is the established PDN Any PDN connection in the connection.
  • the control plane function entity sends the corresponding network slice information to the terminal when the established PDN connection is switched to the 5G network, so that when the terminal switches to the 5G network, the PDU session can be established in the 5G network slice according to the corresponding network slice information.
  • the corresponding network slice information is carried in the protocol configuration item PCO message.
  • the control plane function entity sends the corresponding network slice information to the terminal when the PDN message is switched to the 5G network through the PCO message, and the specific PCO message can pass the Mobility Management Entity (MME) in the 4G network and The base station sends to the terminal.
  • MME Mobility Management Entity
  • the PCO message is used to deliver the corresponding network slice information when the PDN connection of the established packet data network is switched to the 5G network, so that the MME can transparently transmit the message without saving the message.
  • control plane function entity may determine, according to the access point name APN corresponding to the established PDN connection, the network slice information corresponding to the established PDN connection when switching to the 5G network. .
  • the control plane function entity further sends indication information to the terminal, where the indication information is used to indicate that the network slice information sent by the control plane function entity is a home location.
  • the network slices information so that the home network slice information received from the control plane function entity is mapped to the visited network slice information after the terminal receives the indication information.
  • the control plane function entity may determine a corresponding home location when the established PDN connection is switched to 5G.
  • Network slice information then, the network slice information corresponding to the home location when the established PDN connection is switched to 5G is mapped to the visited network slice information; and the established PDN connection is switched to 5G.
  • the network slice information of the visited place is sent to the terminal as the slice information corresponding to the time when the established PDN connection is switched to 5G. In this way, all the network slice information received by the terminal can be used directly.
  • the terminal does not need to configure the related mapping table.
  • the PDU session does not need to be differentiated into the home route.
  • the corresponding network slice information when the established PDN connection is switched to the 5G network further includes an identifier NSI-ID of the network slice instance corresponding to the established PDN connection when the PDN connection is switched to the 5G network.
  • the corresponding network slice information is included in the corresponding network slice information when the PDN connection sent by the control plane function entity to the terminal is switched to the 5G network, thereby ensuring Session continuity after PDN connection switching.
  • the method before the control plane function entity sends the network packet information corresponding to the time when the established packet data network PDN connection is switched to the 5G network, the method includes: the control plane function entity receives A capability indication from the terminal, the capability indication is used to indicate that the terminal is able to switch to a 5G network.
  • the control plane function entity may establish a PDN connection for different terminals at the same time, but for those PDN connections that do not have 5G network communication capability or need to switch to the terminal in the 5G network, the control plane function entity does not need to send to these terminals.
  • a terminal having the function of implementing the method of the first aspect described above.
  • This function can be implemented in hardware or in hardware by executing the corresponding software.
  • the hardware or software includes one or more modules corresponding to the functions described above.
  • an apparatus comprising: a processor and a memory; the memory is configured to store a computer execution instruction, and when the apparatus is running, the processor executes the computer execution instruction stored in the memory to cause the apparatus to execute A session establishing method as described in any one of the above first aspects.
  • the device may specifically be the terminal or the chip in the terminal involved in the session establishment method according to any one of the first aspects.
  • a fifth aspect a computer readable storage medium having instructions stored therein that, when executed on a computer, cause the computer to perform session establishment as described in any of the above first aspects method.
  • a computer program product comprising instructions which, when run on a computer, cause the computer to perform the session establishment method of any of the above first aspects.
  • a control plane functional entity is provided, the control surface functional entity having the functionality to implement the method of the second aspect described above.
  • This function can be implemented in hardware or in hardware by executing the corresponding software.
  • the hardware or software includes one or more modules corresponding to the functions described above.
  • a control plane functional entity comprising: a processor and a memory; the memory is configured to store a computer execution instruction, and when the device is running, the processor executes the computer execution instruction stored in the memory, so that The apparatus performs the session establishment method as described in any of the above second aspects.
  • a ninth aspect a computer readable storage medium having stored therein instructions that, when run on a computer, cause the computer to perform the session establishment described in any of the above second aspects method.
  • a computer program product comprising instructions which, when run on a computer, cause the computer to perform the session establishment method of any of the above second aspects.
  • FIG. 1 is a schematic diagram of a 4G network and a 5G network interworking architecture
  • FIG. 2 is a schematic structural diagram of hardware of a communication device according to an embodiment of the present application.
  • FIG. 3 is a schematic flowchart 1 of a session establishing method according to an embodiment of the present application.
  • FIG. 4 is a second schematic flowchart of a session establishing method according to an embodiment of the present disclosure
  • FIG. 5 is a schematic structural diagram of an apparatus according to an embodiment of the present application.
  • FIG. 6 is a schematic structural diagram of a control plane function entity according to an embodiment of the present application.
  • the NSSAI includes multiple S-NSSAIs.
  • the S-NSSAI consists of a slice/service type (SST) and a slice differentiator (SD).
  • SST and the SD may be defined by a standard or an operator; the SD is optional information supplementing the SST to distinguish multiple network slices of the same SST, for example, may be used to characterize the belonging relationship of the network slice.
  • the types and effects of NSSAI defined in the 23.501 standard are shown in Table 1.
  • the network architecture and the service scenario described in the embodiments of the present invention are used to more clearly illustrate the technical solutions of the embodiments of the present invention, and do not constitute a limitation of the technical solutions provided by the embodiments of the present invention.
  • the technical solutions provided by the embodiments of the present invention are equally applicable to similar technical problems.
  • the embodiment of the present invention provides a method for mobility management, which can be applied to the 4G network and the 5G network interworking architecture system 100 shown in FIG. 1.
  • the user plane function is shared between the 4G network and the 5G network.
  • UPF user plane function
  • PGW-U PDN gateway user plane function
  • SMF session management function
  • PDN gateway control plane function PDN gateway control plane function
  • PGW-C PDN gateway control plane function
  • PCF policy control function
  • PCF policy and charging rules function
  • PCF policy and charging rules function
  • HSS home subscriber server
  • UDM unified data Unified data management
  • UPF is the user plane function of the 5G network
  • PGW-U is the gateway user plane function of the 4G network corresponding to the UPF
  • SMF is the session management function of the 5G network
  • PGW-C is the corresponding to the SMF.
  • the PCF is the policy control function of the 5G network
  • the PCRF is the policy charging rule function of the 4G network corresponding to the PCF.
  • coupling means that the same device has the functions of two entities at the same time.
  • the HSS+UDM entity is referred to as a user data management entity
  • the PGW-C entity+SMF entity is referred to as a control plane function entity, which is uniformly described herein, and is not described herein again.
  • the network device after the above-mentioned connection may also use other names, which is not specifically limited in this embodiment of the present application.
  • the foregoing 4G network and 5G network interworking architecture may further include an MME and a Serving Gateway (SGW), and an Access and Mobility Management Function in the 5G network. AMF) entity.
  • SGW Serving Gateway
  • AMF Access and Mobility Management Function
  • the terminal accesses the 4G network through an evolved universal terrestrial radio access network (E-UTRAN) device, and the terminal passes the next generation radio access network (NG-RAN) device. Access to 5G networks.
  • the E-UTRAN device communicates with the MME through the S1-MME interface, the E-UTRAN device communicates with the SGW through the S1-U interface, the MME communicates with the SGW through the S11 interface, and the MME communicates with the user data management entity through the S6a interface, and the MME passes the N26 interface.
  • the SGW communicates with the PGW-U entity + UPF entity through the S5-U interface
  • the SGW communicates with the PGW-C entity + SMF entity through the S5-C interface
  • the PGW-U entity + UPF entity passes the N3 interface and the NG-RAN Device communication
  • the PGW-U entity + UPF entity communicates with the PGW-C entity + SMF entity through the N4 interface
  • the PGW-C entity + SMF entity communicates with the PCRF entity + PCF entity through the N7 interface
  • the HSS+UDM entity passes the N10 interface and the PGW -C entity + SMF entity communication
  • HSS+UDM entity communicates with AMF entity through N8 interface
  • PCRF entity + PCF entity communicates with AMF entity through N15 interface
  • PGW-C entity + SMF entity communicates with AMF entity through N11 interface
  • AMF entity The NMF entity communicates with the NG-RAN device through the N2 interface
  • the AMF entity communicates with the terminal through the N1
  • the name of the interface between the network elements in FIG. 1 is only an example. In the specific implementation, the interface name may be other names, which is not specifically limited in this embodiment of the present application.
  • the NG-RAN device in the 5G network may also be referred to as an access device, and the access device refers to a device that accesses the core network, for example, a base station, a broadband network service gateway (broadband network gateway, BNG), aggregation switch, non-3GPP access equipment, etc.
  • the base station may include various types of base stations, such as a macro base station, a micro base station (also referred to as a small station), a relay station, an access point, and the like, which are not specifically limited in this embodiment of the present application.
  • the 4G network may also include a general packet radio system (GPRS) service support node (SGSN), etc., 5G.
  • the network may also include an authentication service function (AUSF) entity and a network slice selection function (NSSF) entity, which are not specifically limited in this embodiment of the present application.
  • GPRS general packet radio system
  • SGSN general packet radio system
  • AUSF authentication service function
  • NSSF network slice selection function
  • the control plane function entity Since the PDN connection in the 4G network is served by the combined PGW-C/SMF and PGW-U/UPF (ie, the control plane function entity), after the terminal switches from 4G to the 5G network, the PDU session is still performed by the PGW-C. /SMF and PGW-U/UPF perform the service, that is, before and after the handover, the anchor of the session service remains unchanged, so that the IP address of the session is saved.
  • the control plane function entity when the UE accesses the 4G network and establishes a PDN connection, the control plane function entity sends the corresponding network slice information to the terminal when the PDN connection established by the terminal is switched to the 5G network.
  • the terminal When the terminal moves to the 5G network, the terminal carries the network slice information corresponding to the time when the established PDN connection is switched to the 5G network.
  • the 5G network determines the AMF and the Allowed NSSAI served by the UE according to the information of the network slice corresponding to the established PDN connection, and sends the Allowed NSSAI to the terminal.
  • the terminal can determine which established PDN connections can be switched to the 5G network according to the corresponding network slice information when the terminal switches to the 5G network according to the established PSN connection in the 4G network. For a PDN connection that can be switched to a 5G network, the terminal initiates a PDU session establishment, thereby completing session switching across the network.
  • the terminals involved in the embodiments of the present application may include various handheld devices having wireless communication functions, in-vehicle devices, wearable devices, computing devices, or other processing devices connected to the wireless modem; and may also include a subscriber unit ( Subscriber unit), cellular phone, smart phone, wireless data card, personal digital assistant (PDA) computer, tablet computer, wireless modem (modem), handheld device, a laptop computer, a cordless phone, or a wireless local loop (WLL) station, a machine type communication (MTC) terminal, a user equipment (UE), Mobile station (MS), terminal device, etc.
  • Subscriber unit Subscriber unit
  • cellular phone smart phone
  • wireless data card personal digital assistant
  • modem modem
  • WLL wireless local loop
  • MTC machine type communication
  • UE user equipment
  • MS Mobile station
  • the node shown in FIG. 1, such as a terminal, MME, AMF, SMF entity + PGW-C entity, E-UTRAN or NG-RAN, may be the communication device (or system) in FIG. The way to achieve.
  • FIG. 2 is a schematic diagram showing the hardware structure of a communication device according to an embodiment of the present application.
  • the communication device 200 includes at least one processor 201, a communication line 202, a memory 203, and at least one communication interface 204.
  • the processor 201 can be a general central processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more for controlling the execution of the program of the present application. integrated circuit.
  • CPU central processing unit
  • ASIC application-specific integrated circuit
  • Communication line 202 can include a path for communicating information between the components described above.
  • the communication interface 204 uses devices such as any transceiver for communicating with other devices or communication networks, such as Ethernet, radio access network (RAN), wireless local area networks (WLAN), etc. .
  • devices such as any transceiver for communicating with other devices or communication networks, such as Ethernet, radio access network (RAN), wireless local area networks (WLAN), etc. .
  • RAN radio access network
  • WLAN wireless local area networks
  • the memory 203 can be a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a random access memory (RAM) or other type that can store information and instructions.
  • the dynamic storage device can also be an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, and a disc storage device. (including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or can be used to carry or store desired program code in the form of instructions or data structures and can be Any other media accessed, but not limited to this.
  • the memory may be present independently and connected to the processor via communication line 302. The memory can also be integrated with the processor.
  • the memory 203 is used to store computer execution instructions for executing the solution of the present application, and is controlled by the processor 201 for execution.
  • the processor 201 is configured to execute computer execution instructions stored in the memory 203, thereby implementing the session establishment method provided by the following embodiments of the present application.
  • the computer-executed instructions in the embodiment of the present application may also be referred to as an application code, which is not specifically limited in this embodiment of the present application.
  • processor 201 may include one or more CPUs, such as CPU0 and CPU1 in FIG.
  • communication device 200 can include multiple processors, such as processor 201 and processor 208 in FIG. Each of these processors can be a single-CPU processor or a multi-core processor.
  • processors herein may refer to one or more devices, circuits, and/or processing cores for processing data, such as computer program instructions.
  • the communication device 200 can also include an output device 205 and an input device 206.
  • Output device 205 is in communication with processor 201 and can display information in a variety of ways.
  • the output device 205 can be a liquid crystal display (LCD), a light emitting diode (LED) display device, a cathode ray tube (CRT) display device, or a projector.
  • Input device 306 is in communication with processor 301 and can receive user input in a variety of ways.
  • input device 206 can be a mouse, keyboard, touch screen device or sensing device, and the like.
  • the communication device 200 described above may be a general purpose device or a dedicated device.
  • the communication device 200 can be a desktop computer, a portable computer, a network server, a personal digital assistant (PDA), a mobile phone, a tablet computer, a wireless terminal device, an embedded device, or the like in FIG. device.
  • PDA personal digital assistant
  • the embodiment of the present application does not limit the type of the communication device 200.
  • a session establishment method provided by an embodiment of the present application.
  • the terminal first accesses the 4G network through the E-UTRAN device, and establishes a PDN connection in the 4G network. After the terminal location moves to the 5G service range, the terminal accesses the 5G network through the NG-RAN device.
  • the embodiment of the present application is applicable to a non-roaming or LBO roaming scenario. The method comprises the following steps:
  • Step 301 The terminal establishes a PDN connection on the 4G network.
  • the establishment of a PDN connection may be established during the attach process or initiated by the terminal after attachment.
  • the process of establishing a PDN connection is described in the existing protocol and will not be described here.
  • the terminal determines that it may subsequently switch to the 5G network, for example, determining that it has the capability of supporting the 5G network, and the terminal sends a capability indication to the control plane function function entity, the capability The indication is used to indicate that the terminal can subsequently switch to the 5G network, and the capability indication may be capability information that the terminal supports 5G (for example, the terminal supports the indication of the 5G NAS).
  • the terminal sends the capability indication to the control plane function function entity, and the method includes: when the terminal attaches to the 4G network, sends the capability indication to the MME, so that the MME sends the capability indication to the control plane function entity by using the SGW in the PDN connection establishment process. Or the terminal sends a protocol configuration option (PCO) message to the control plane function entity, where the PCO message carries the capability indication.
  • PCO protocol configuration option
  • the terminal may establish one or more PDN connections in the 4G network, and the one or more PDN connections may be served by one or more control plane function entities, which is not limited in this embodiment of the present application.
  • the embodiment of the present application is only an example in which a terminal establishes one or more PDN connections through a control plane function instance.
  • Step 302 The control plane function entity acquires the network slice information corresponding to the time when the established PDN connection is switched to the 5G, and sends the network slice information to the terminal, so that the terminal receives the corresponding PDN connection and switches to the 5G. Network slice information.
  • the established PDN connection includes one or more PDN connections.
  • the PDU session in the 5G is associated with the network slice instance, and a network slice instance may be indicated by a network slice instance ID (NSI-ID).
  • a network slice identified by the S-NSSAI may have multiple network slice instances (for example, different network slice instances may implement load sharing), and a network slice instance may support one or more data networks, where the data network It can be identified by the Data Network Name (DNN).
  • DNN Data Network Name
  • the PDN connection sent by the control plane function entity to the terminal is switched to 5G.
  • Network slice information which can include different content. Since the control plane function entity is located in the network slice instance, when the control plane function entity supports multiple network slices, the control plane function entity can obtain the S-NSSAI and network slice corresponding to different network slice instances supported by the control plane. The identity of the instance, the NSI-ID, and one or more data network names supported by the network slice instance.
  • the corresponding network slice information when the established PDN connection is switched to the 5G includes the S-NSSAI of the corresponding network slice when the established PDN connection is switched to the 5G, and optionally, the established PDN connection is switched to The identifier NSI-ID of the corresponding network slice instance in the 5G network.
  • the control plane function entity needs to acquire the DNN used when the terminal switches to the 5G network, and sends the DNN to the terminal.
  • the mapping between the PDN connection and the S-NSSAI is pre-configured in the control plane function entity according to the network deployment, and the control plane function entity obtains the corresponding PDN connection when the switch is switched to 5G.
  • the network slice information includes: the control plane function entity acquires the network slice corresponding to the established PDN connection according to the information about the established PDN connection, and the correspondence between the pre-configured PDN connection and the S-NSSAI. S-NSSAI.
  • the DNN used when the PDN connection is switched to 5G is the same as the APN in 4G, and only one network slice instance is deployed for each S-NSSAI.
  • a mapping relationship between the PDN connection and the S-NSSAI and the DNN is pre-configured in the control plane function entity, and the control plane function entity acquires the established PDN connection switch to Corresponding network slice information at 5G, comprising: the control plane function entity acquiring the established PDN according to the information about the established PDN connection and the correspondence between the pre-configured PDN connection and the S-NSSAI and the DNN The S-NSSAI of the corresponding network slice when the connection is switched to the 5G network and the DNN used when the established PDN connection is switched to the 5G.
  • the DNN used when the PDN connection is switched to 5G is different from the APN in 4G, and only one network slice instance is deployed for each S-NSSAI.
  • a correspondence between a PDN connection and an S-NSSAI, a DNN, and an NSI-ID is pre-configured in the control plane function entity, and the control plane function entity acquires the established relationship.
  • Corresponding network slice information when the PDN connection is switched to 5G including: the information of the control plane function entity according to the established PDN connection, and the correspondence between the pre-configured PDN connection and the S-NSSAI, DNN, and NSI-ID Obtaining an S-NSSAI corresponding to the network slice when the established PDN connection is switched to 5G, a DNN used when the established PDN connection is switched to 5G, and a network corresponding to when the established PDN connection is switched to 5G The identification NSI-ID of the slice instance. Under this network deployment, the DNN used when the PDN connection is switched to 5G may be different from the APN in 4G, and each S-NSSAI may deploy more than one network slice instance.
  • the PDN connection may be characterized by the APN corresponding to the PDN connection, that is, the information of the established PDN connection may specifically include the APN corresponding to the established PDN connection, and optionally, the APN corresponding to the PDN connection and the related subscription. Information to characterize.
  • the specific form of the information of the PDN connection is not limited in this embodiment of the present application.
  • control plane function entity may send the corresponding network slice information to the terminal when the PDN connection is switched to 5G through the PCO message in the PDN connection establishment response or the attachment response of the terminal.
  • the PCO message sent by the control plane function entity to the terminal further includes a DNN used when the established PDN connection is switched to 5G.
  • Step 303 When the terminal moves to the coverage of the 5G network, the terminal initiates a registration request, where the registration request includes the network slice information corresponding to the handover of the PDN connection that the terminal requests to switch to the 5G, and the registration request is performed by the access device (such as the base station). ) is sent to the AMF so that the AMF receives the registration request.
  • the PDN connection that the terminal requests to switch is a part or all of the PDN connections of the established PDN connection.
  • the terminal After receiving the corresponding network slice information when the established PDN connection from the control plane function entity is switched to the 5G, the terminal determines, according to its own policy requirement, the PDN connection requesting the handover and the request handover.
  • the corresponding network slice information when the PDN connection is switched to 5G.
  • the user triggers the establishment of the PDN connection 1 and the PDN connection 2 through APP1 and APP2 installed on the terminal, respectively, and the control plane function entity returns to the terminal the network slice information corresponding to the PDN connection 1 and the PDN connection 2 handover when the PDN connection 1 is switched to 5G.
  • the network slice information corresponding to 5G at this time, the terminal monitors that APP1 and APP2 set the switching policy (which may be set by the user or may be provided by the application), for example, APP1 prohibits switching to the 5G network, and APP2 has 5G coverage. If the priority is switched to 5G or the like, the terminal determines that the PDN connection 2 is the PDN connection requesting the handover, and the corresponding network slice information when the PDN connection 2 is switched to the 5G is the network slice information corresponding to the PDN connection when the handover is requested to be switched to the 5G.
  • the switching policy which may be set by the user or may be provided by the application
  • the access device selects the AMF according to the S-NSSAI carried in the registration request.
  • the terminal carries the S-NSSAI corresponding to the network slice when the PDN connection requesting the handover is switched to the 5G in the registration request.
  • the terminal may also carry other S-NSSAIs requested by the terminal.
  • the access device selects the AMF according to the S-NSSAI corresponding to the network slice when the PDN connection requested to be switched and the other S-NSSAI requested by the terminal, and forwards the registration request to the selected AMF, so as to facilitate the registration sent by the AMF receiving terminal. request.
  • the terminal may switch the PDN connection requesting the handover to the 5G, and the S-NSSAI of the corresponding network slice and the other S-NSSAI requested by the terminal are sent to the AMF in the “requested NSSAI”, and the terminal notifies the AMF of “requested”.
  • the method for sending, by the embodiment, the S-NSSAI corresponding to the network slice of the corresponding network slice to the AMF when the PDN connection requesting the handover is switched to the AMF is not limited.
  • the registration request further includes an identifier of the terminal.
  • the AMF may perform the process of authenticating the terminal, and finally obtain the SURM (Subscription Permanent Identifier).
  • SURM Subscriber Permanent Identifier
  • Step 304 The AMF obtains the subscription data of the terminal, and the subscription data of the terminal includes the network slice subscription data of the terminal and the correspondence between the APN corresponding to the PDN connection and the identifier of the control plane function entity.
  • the AMF obtains the subscription data of the terminal according to the terminal identifier (or SUPI) in the registration request: preferentially acquires the subscription data of the terminal from the AMF locally, and obtains the subscription of the terminal from the user data management entity if there is no subscription data of the terminal locally.
  • Data optionally, AMF also saves the subscription data of the terminal in the context corresponding to the terminal.
  • the network slice subscription number of the terminal includes the S-NSSAI corresponding to the network slice of the subscription, and optionally, the DNN corresponding to the network slice of the subscription.
  • Step 305 The AMF obtains an S-NSSAI (ie, Allowed NSSAI) corresponding to the network slice that the terminal is allowed to access.
  • S-NSSAI ie, Allowed NSSAI
  • the AMF may obtain the Allowed NSSAI according to information such as the corresponding network slice information and the subscription data of the terminal when the PDN connection requested to be switched is switched to 5G.
  • the AMF itself determines the Allowed NSSAI according to information such as the corresponding network slice information and the subscription data of the terminal when the PDN connection requested to be switched is switched to 5G.
  • the AMF may further determine the Allowed NSSAI according to other S-NSSAIs requested by the terminal.
  • the corresponding network slice information includes the S-NSSAI of the corresponding network slice when the PDN connection requesting handover is switched to 5G, and the AMF will request the S slice corresponding to the switched PDN connection.
  • the NSSAI and the other S-NSSAI requested by the terminal take the union, and then the S-NSSAI corresponding to the network slice corresponding to the contracted network segment of the terminal and the S-NSSAI corresponding to the network slice supported by the AMF determine the Allowed NSSAI.
  • the corresponding network slice information includes the S-NSSAI of the network slice corresponding to the PDN connection requesting the handover and the identifier NSI-ID of the corresponding network slice instance when the PDN connection requesting the handover is switched to 5G.
  • the AMF also removes the PDN connection corresponding to the network slice instance that cannot be served according to the identifier NSI-ID of the corresponding network slice instance when the PDN connection requested to be switched is switched to 5G.
  • the S-NSSAI of the network slice corresponding to the PDN connection requesting the handover is S-NSSAI1 and S-NSSAI2
  • the other S-NSSAIs requested by the terminal are S-NSSAI3 and S-NSSAI4
  • the S-NSSAI corresponding to the network slice of the subscription of the terminal NSSAI is S-NSSAI1, S-NSSAI3 and S-NSSAI5.
  • the S-NSSAI corresponding to the network slice supported by AMF includes S-NSSAI1, S-NSSAI12, S-NSSAI13, S-NSSAI14, S-NSSAI15, then AMF will request The S-NSSAI of the network slice corresponding to the switched PDN connection and the other S-NSSAI requested by the terminal are combined to obtain S-NSSAI1, S-NSSAI2, S-NSSAI3, and S-NSSAI4, and then correspond to the network slice of the subscription of the terminal.
  • the intersection of S-NSSAI corresponding to the network slice supported by S-NSSAI and AMF obtains S-NSSAI1 and S-NSSAI3, thereby determining that Allowed NSSAI includes S-NSSAI1 and S-NSSAI3.
  • the AMF requests a network slice selection function (NSSF) entity to determine Allowed NSSAI for the terminal.
  • the AMF sends a slice selection request to the NSSF, where the slice selection request includes the corresponding network slice information and the subscription data of the terminal when the PDN connection requesting the handover is switched to the 5G, and optionally, other S-NSSAIs requested by the terminal.
  • the NSSF determines the Allowed NSSAI and the target AMF set corresponding to the Allowed NSSAI according to the other S-NSSAI requested by the terminal, according to the PSN connection that is requested to be switched to the corresponding network slice information and the subscription data of the terminal.
  • the corresponding network slice information includes the S-NSSAI of the corresponding network slice when the PDN connection requesting the handover is switched to the 5G, and the NSSF responds when the PDN connection requesting the handover is switched to the 5G.
  • the S-NSSAI of the network slice and the other S-NSSAI requested by the terminal take the union, and then take the intersection of the S-NSSAI corresponding to the network slice of the contract of the terminal to determine the first NSSAI, and then collect the location of the terminal, and the AMF in the network.
  • the information of the deployment situation and the like determine the target AMF set corresponding to the Allowed NSSAI and the Allowed NSSAI, wherein the Allowed NSSAI is part or all of the NSSAI in the first NSSAI, and any one of the target AMF sets can simultaneously serve the corresponding Allowed NSSAI. Any one of the network slices.
  • the NSSF may select the target AMF from the set of target AMFs.
  • the NSSF sends the Allowed NSSAI and the target AMF set (or the target AMF selected from the target AMF set) to the AMF.
  • the AMF and the NSSF may also use other methods to confirm the Allowed NSSAI.
  • the method used by the AMF and the NSSF in the embodiment of the present application to confirm the Allowed NSSA is not limited.
  • the AMF decides whether to redirect the terminal to other AMF processing according to the target AMF set or target AMF returned by the NSSF, and if necessary, the AMF redirects the terminal to other AMFs.
  • the method of the redirection is well known to the public, and the embodiment of the present application does not describe it.
  • the default AMF of the embodiment of the present application is included in the target AMF set, that is, the AMF does not need to redirect the terminal to other AMF processing.
  • Step 306 The AMF sends a registration response to the terminal, so that the terminal receives the registration response, where the registration response includes an S-NSSAI corresponding to the network slice that the terminal is allowed to access, that is, Allowed NSSAI.
  • Step 307 The terminal determines that the PDN connection in the 5G network can be switched.
  • the terminal determines, according to the S-NSSAI corresponding to the network slice that is allowed to access, and the network slice information that is requested when the PDN connection requesting the handover is switched to the 5G, to switch to the PDN connection in the 5G network.
  • the S-NSSAI corresponding to the network slice that the terminal is allowed to access is S-NSSAI1 and S-NSSAI3
  • the S-NSSAI of the network slice corresponding to the PDN connection that is requested to be switched is S-NSSAI1 and S-NSSAI2
  • the terminal determines the PDN connection.
  • the S-NSSAI of the corresponding network slice can be switched to the 5G network for the PDN connection of the S-NSSAI1.
  • Step 308 The terminal sends a PDU session establishment request to the AMF, so that the AMF receives the PDU session establishment request sent by the terminal, where the PDU session establishment request includes the S-NSSAI of the network slice corresponding to the first PDN connection.
  • the first PDN connection is any one of the switchable PDN connections.
  • the terminal defaults to the DNN and the used when the established PDN connection is switched to the 5G.
  • the APN in 4G is the same. Therefore, the DNN used when the first PDN connection is switched to 5G is equal to the APN corresponding to the first PDN connection.
  • the terminal When the control plane function entity sends the DNN used when the established PDN connection is switched to 5G to the terminal, the terminal defaults to the DNN used when the established PDN connection is switched to 5G and the APN in the 4G. different. Therefore, the PDU session establishment request further includes an APN corresponding to the first PDN connection.
  • the terminal maintains the APN corresponding to the established PDN connection.
  • Step 309 The AMF determines a control plane function entity, and forwards the PDU session establishment request to the determined control plane function entity to facilitate the control plane function entity to receive the PDU session establishment request.
  • the AMF determines the control plane functional entity according to the corresponding APN of the first PDN connection and the correspondence between the APN and the identity of the control plane functional entity.
  • the AMF determines that the APN corresponding to the first PDN connection is equal to The first PDN connects to the DNN used when switching to 5G, and determines the control plane functional entity according to the corresponding APN of the first PDN connection and the corresponding relationship between the APN and the identity of the control plane functional entity.
  • the AMF When the PDU session establishment request received by the AMF includes the S-NSSAI of the network slice corresponding to the first PDN connection, the DNN used when the first PDN connection is switched to 5G, and the APN corresponding to the first PDN connection, the AMF is connected according to the first PDN.
  • Step 310 Establish a PDU session in a network slice instance corresponding to the PDN connection.
  • the control plane function entity determines the network slice information corresponding to the established PDN connection to be switched to the 5G, and sends the information to the UE through the PCO, and the subsequent UE is registered.
  • the network slice information is carried in the 5GC to help the 5GC select and support the 5G network slice corresponding to the established PDN connection, so as to ensure that the IP address of the session remains unchanged.
  • the terminal first accesses the 4G network through the E-UTRAN device, and establishes a PDN connection in the 4G network. After the terminal location moves to the 5G service range, the terminal accesses the 5G network through the NG-RAN device.
  • the embodiment of the present application is applicable to a scenario (home route) routed from a home public land mobile operator network (HPLMN) during roaming.
  • the home control plane function entity is located in the HPLMN.
  • the method comprises the following steps:
  • Step 401 The terminal establishes a PDN connection on the 4G network.
  • Step 402 The home control plane function entity acquires the network slice information corresponding to the time when the established PDN connection is switched to the 5G, and sends the network slice information to the terminal, so that the terminal receives the established PDN connection and switches to the 5G. Corresponding network slice information.
  • Step 401 is the same as step 301, and step 402 is the same as step 302.
  • the related description refers to the related steps of the foregoing embodiment, and details are not described herein again.
  • the network slice information corresponding to the home network control plane function entity to the terminal when the PDN connection is switched to 5G is the network slice information (such as S-NSSAI) corresponding to the home network.
  • the home control plane function entity sends the indication information indicating that the PDN connection is the home route to the UE, and the indication information is used by the And indicating that the network slice information received from the control plane function entity is the home network slice information, so as to facilitate the mapping relationship between the UE according to the home PLMN ID, the home location S-NSSAI, and the home location of the UE to the visited site S-NSSAI.
  • the S-NSSAI corresponding to the home location is mapped to the S-NSSAI corresponding to the visited location, and the home route indication information may be a PLMN ID of the home location or an identifier of whether it is a home route.
  • the network slice information corresponding to the visited network when the PDN connection sent by the home control plane function entity is switched to the 5G is the visited S-NSSAI, and the home control plane function entity uses the PDN.
  • the network slice information corresponding to the home location when the connection is switched to 5G is mapped to the network slice information of the visited place.
  • the home control plane function entity first determines the network slice information of the home location corresponding to the PDN connection when the PDN connection is switched to the 5G, and then maps the network slice information of the corresponding home location to the visit when the PDN connection is switched to 5G. Network slice information.
  • the home control plane function entity acquires the PLMN ID of the visited place currently accessed by the terminal from the MME, and then slices the network of the home location according to the mapping relationship between the visited location S-NSSAI and the home location S-NSSAI configured by the home control plane function entity.
  • the information is mapped to the network slice information of the visited place, as shown in the following table:
  • control plane function entity may further request the NSSF to map the home corresponding S-NSSAI to the visited S-NSSAI. Specifically, the control plane function entity sends the home PLMN ID, the home location S-NSSAI, and the visited PLMN ID to the NSSF, and the NSSF returns the S-NSSAI corresponding to the visited location to the control plane function entity.
  • Step 403 When the terminal moves to the coverage of the 5G network, the terminal initiates a registration request, where the registration request includes the network slice information corresponding to the handover of the PDN connection that the terminal requests to switch to the 5G, and the registration request passes through the access device (such as the base station). ) is sent to the AMF so that the AMF receives the registration request. If the terminal receives the home route indication information in step 402, the terminal maps the received network slice information corresponding to the home location to the network slice information corresponding to the visited location.
  • the terminal maps the network slice information corresponding to the home location to the network slice information corresponding to the visited location according to the mapping relationship between the network slice information corresponding to the home location, the home PLMN ID, and the network location information corresponding to the UE and the visited network.
  • the PDN connection that the terminal requests to switch is a part or all of the PDN connections of the established PDN connection.
  • Step 404 The AMF obtains the subscription data of the terminal, where the subscription data of the terminal includes the network slice subscription data of the terminal, and the correspondence between the APN corresponding to the PDN connection and the identifier of the control plane function entity.
  • Step 404 is the same as step 304.
  • the related description refers to the related steps of the foregoing embodiment, and details are not described herein again.
  • Step 405 The AMF obtains an S-NSSAI (ie, Allowed NSSAI) corresponding to the network slice that the terminal is allowed to access.
  • S-NSSAI ie, Allowed NSSAI
  • step 403 except that the AMF is the visited AMF, and the AMF in step 303 is the home AMF, the other specific implementation manners are the same.
  • step 405 the AMF is based on the attribution.
  • the S-NSSAI of the network slice of the network slice and the S-NSSAI of the network slice of the visited site are mapped to the S-NSSAI of the network slice of the visited network when the established PDN connection is switched to 5G. And mapping the S-NSSAI of the network slice subscribed by the user to the S-NSSAI of the visited network slice, and then determining the S-NSSAI corresponding to the visited network slice that the terminal is allowed to access.
  • the specific method is the same as step 305, and will not be described here.
  • the corresponding network slice information when the PDN connection requested by the terminal in the step 403 is switched to the 5G is the correspondence between the S-NSSAI of the network slice according to the home network and the S-NSSAI of the visited network slice.
  • the S-NSSAI mapping of the corresponding network slice when the PDN connection requesting the handover is switched to 5G is the S-NSSAI of the corresponding visited network slice when the PDN connection requesting the handover is switched to 5G. That is, with respect to step 302, after the terminal determines the PDN connection requesting the handover, it is also required to connect the PDN requesting the handover according to the correspondence between the S-NSSAI of the home network slice and the S-NSSAI of the visited network slice.
  • the S-NSSAI mapping of the corresponding network slice when switching to 5G is the S-NSSAI of the visited visited network slice when the PDN connection requesting the handover is switched to 5G.
  • the AMF maps the S-NSSAI of the network slice subscribed by the user to the S-NSSAI of the visited network slice according to the correspondence between the S-NSSAI of the home network slice and the S-NSSAI of the visited network slice.
  • the NSSAI is then determined according to the S-NSSAI of the network slice of the visited site corresponding to the S-NSSAI of the network slice that the user subscribes to, and the S-NSSAI of the corresponding visited network slice when the terminal requests the switched PDN connection to switch to the 5G.
  • the S-NSSAI corresponding to the incoming network slice The specific method is the same as step 305, and details are not described herein again.
  • Step 406 The AMF sends a registration response to the terminal, so that the terminal receives the registration response, where the registration response includes an S-NSSAI corresponding to the visited network slice that the terminal is allowed to access, that is, Allowed NSSAI.
  • Step 407 The terminal determines that the PDN connection in the 5G network can be switched.
  • step 307 the difference from step 307 is that if the corresponding network slice information is the S-NSSAI of the home when the PDN connection received by the terminal is switched to 5G, the terminal according to the S-NSSAI and the visited place of the home network slice.
  • the terminal corresponds to the S-NSSAI of the network slice.
  • the S-NSSAI corresponding to the visited visited network slice that the terminal receives in step 406 determines that the PDN connection in the 5G network can be switched.
  • Step 408 The terminal sends a PDU session establishment request to the AMF, so that the AMF receives the PDU session establishment request sent by the terminal, where the PDU session establishment request includes a corresponding visited place when the first PDN connection is switched to the 5G network.
  • the first PDN connection is any one of the switchable PDN connections.
  • step 402 when the home control plane function entity does not send the DNN used when the established PDN connection is switched to 5G, the terminal defaults to the DNN used when the established PDN connection is switched to 5G. It is the same as the APN in 4G. Therefore, the DNN used when the first PDN connection is switched to 5G is equal to the APN corresponding to the first PDN connection.
  • step 402 when the home control plane function entity sends the DNN used by the established PDN connection to the 5G to the terminal, the terminal defaults to the DNN used in the established PDN connection when switching to 5G and in the 4G.
  • the APN is different. Therefore, the PDU session establishment request further includes an APN corresponding to the first PDN connection.
  • the terminal maintains the APN corresponding to the established PDN connection.
  • the UE sends the identifier information of the home network slice instance to the AMF.
  • Step 409 The AMF determines the visited control plane function entity and the home control plane function entity, and forwards the PDU session establishment request to the determined visited control plane function entity, so that the visited control plane function entity receives the PDU. Session establishment request.
  • the AMF determines a home control plane function entity, where the AMF obtains the PDN connection context information of the terminal from the user data management entity, where the PDN connection context information includes the APN and the home location control corresponding to the PDN connection.
  • the AMF obtains the PDN connection context information of the terminal from the user data management entity, where the PDN connection context information includes the APN and the home location control corresponding to the PDN connection.
  • the AMF determines that the APN corresponding to the first PDN connection is equal to the first
  • the DNN is used when the PDN connection is switched to the 5G
  • the home control plane functional entity is determined according to the corresponding APN of the first PDN connection and the corresponding relationship between the APN and the identity of the home control plane functional entity.
  • the AMF When the PDU session establishment request received by the AMF includes the S-NSSAI of the visited network slice corresponding to the first PDN connection, the DNN used when the first PDN connection is switched to the 5G, and the APN corresponding to the first PDN connection, the AMF is according to the first The corresponding APN of the PDN connection and the corresponding relationship between the APN and the identity of the functional entity of the home control plane determine the functional entity of the home control plane.
  • the AMF determines the visited control plane function entity, and specifically includes: the AMF determines the visited control plane function entity according to the S-NSSAI of the visited network slice corresponding to the first PDN connection and the DNN used when the first PDN connection is switched to the 5G. Specifically, the AMF may determine the functional entity of the visited control plane according to the local configuration or by querying the network function repository function (NRF) entity. The specific determining process refers to the existing protocol, and details are not described herein again. If the AMF receives the home network slice instance identifier from the UE in step 408, the AMF also selects according to the home network slice instance identifier when selecting the visited control plane function entity, and the selected visited control plane function entity can be associated with the home location. Network slice instances are interoperable.
  • Step 410 The AMF forwards the PDU session establishment request and the identifier of the home control plane function entity to the visited control plane function entity.
  • Step 411 The visited control plane function entity sends a PDU session establishment request to the home control plane function entity according to the identifier of the home control plane function entity.
  • Step 412 Establish a PDU session in a network slice instance corresponding to the PDN connection.
  • the home control plane function entity determines the network slice information corresponding to the established PDN connection to be switched to the 5G, and sends the information to the UE through the PCO.
  • the UE registers with the 5GC, it carries the network slice information of the network slice information mapped to the visited network, so that the 5GC selects and supports the 5G network slice corresponding to the established PDN connection, so as to ensure that the IP address of the session remains unchanged.
  • the actions of the network elements may be invoked by the processor 201 in the communication device 200 shown in FIG. 2 to call the application code stored in the memory 203.
  • the embodiment of the present application does not impose any limitation on this.
  • the solution provided by the embodiment of the present application is mainly introduced from the perspective of interaction between the network elements.
  • the above-mentioned devices such as the terminal, the AMF, and the control plane function entity include hardware structures and/or software modules corresponding to the execution of the respective functions in order to implement the above functions.
  • the present application can be implemented in a combination of hardware or hardware and computer software in combination with the elements and algorithm steps of the various examples described in the embodiments disclosed herein. Whether a function is implemented in hardware or computer software to drive hardware depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods to implement the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present application.
  • the function module of the terminal and the control plane function entity may be divided according to the foregoing method.
  • each function module may be divided according to each function, or two or more functions may be integrated into one process.
  • the above integrated modules can be implemented in the form of hardware or in the form of software functional modules. It should be noted that the division of the module in the embodiment of the present application is schematic, and is only a logical function division, and the actual implementation may have another division manner.
  • FIG. 5 shows a schematic structural diagram of an apparatus 500.
  • the device 500 may be a terminal in the foregoing embodiment, or may be a chip in the terminal, which is not specifically limited in this embodiment of the present application.
  • the device includes: a receiving module 501 and a sending module 502.
  • the receiving module 501 is configured to receive an established packet data network from a control plane function entity, where a PDN connection is switched to a 5G network.
  • Network slice information; the corresponding network slice information when the established PDN connection is switched to the 5G network includes a single network slice selection auxiliary information S-NSSAI corresponding to the network slice when the established PDN connection is switched to the 5G network;
  • the sending module 502 is configured to send a packet data unit PDU session establishment request, where the PDU session establishment request includes an S-NSSAI of the corresponding network slice when the first PDN connection is switched to the 5G network, and the first PDN connection switch Corresponding data network name DNN to the 5G network; the first PDN connection is any one of the established PDN connections.
  • the network packet information corresponding to the established packet data network PDN connection when the PDN connection is switched to the 5G network is carried in the protocol configuration item PCO message.
  • the receiving module 501 is further configured to receive indication information from the control plane function entity, where the indication information is used to indicate that the network slice information received from the control plane function entity is a home network slice. information.
  • the terminal further includes: a mapping module, configured to: when the PDN connection requesting handover is switched to 5G, according to the mapping between the S-NSSAI of the home network slice and the S-NSSAI of the visited network slice The S-NSSAI of the home network slice is mapped to the S-NSSAI of the corresponding visited network slice when the PDN connection requesting the handover is switched to 5G.
  • a mapping module configured to: when the PDN connection requesting handover is switched to 5G, according to the mapping between the S-NSSAI of the home network slice and the S-NSSAI of the visited network slice The S-NSSAI of the home network slice is mapped to the S-NSSAI of the corresponding visited network slice when the PDN connection requesting the handover is switched to 5G.
  • the network slice information corresponding to the established PDN connection when the PDN connection is switched to the 5G network further includes an identifier NSI-ID of the network slice instance corresponding to the established PDN connection when the PDN connection is switched to the 5G network.
  • the sending module 502 is further configured to send a capability indication to the control plane function entity, where the capability indication is used to indicate that the terminal is capable of switching to a 5G network.
  • the device further includes a determining module, configured to determine, in the established PDN connection, a PDN connection that can be switched to a 5G network, where the first PDN connection is the PDN connection that can be switched to 5G Any one of the PDN connections.
  • the device further includes a determining module 503, configured to determine that the established PDN connection can be switched to a PDN connection in a 5G network, where the first PDN connection is the switchable to 5G Any PDN connection in the PDN connection.
  • the determining module 503 is specifically configured to send a registration request, where the registration request includes network slice information corresponding to when the PDN connection requested by the terminal is switched to the 5G network, where the terminal requests to switch.
  • the PDN connection is part or all of the PDN connection of the established PDN connection; receiving a registration response, the registration response including an S-NSSAI of the network slice that the terminal is allowed to access; and a PDN that is requested to be switched according to the terminal
  • the S-NSSAI corresponding to the network slice that is allowed to access when the user switches to the 5G network and the S-NSSAI of the network slice that is allowed to access are determined to be able to switch to the PDN connection in the 5G network.
  • the PCO message further includes a DNN corresponding to when the first PDN connection is switched to the 5G network, where the PDU session establishment request further includes an access point name APN corresponding to the first PDN connection.
  • the apparatus 500 is presented in a form that divides the various functional modules in an integrated manner.
  • a “module” herein may refer to an application-specific integrated circuit (ASIC), circuitry, a processor and memory that executes one or more software or firmware programs, integrated logic circuitry, and/or other functions that provide the functionality described above.
  • ASIC application-specific integrated circuit
  • Device In a simple embodiment, those skilled in the art will appreciate that device 500 can take the form shown in FIG.
  • the processor 201 in FIG. 2 can execute an instruction by calling a computer stored in the memory 203, so that the apparatus 500 executes the session establishment method in the above method embodiment.
  • the function/implementation process of the receiving module 501, the sending module 502, and the determining module 503 in FIG. 5 can be implemented by the processor 201 in FIG. 2 calling a computer executing instruction stored in the memory 203.
  • the function/implementation process of the receiving module 501, the sending module 502, and the determining module 503 may also be implemented by using a pin or a circuit or the like.
  • the memory 203 may be a memory unit within the chip, such as a register, a cache, or the like.
  • the memory 203 may be a storage unit located outside the chip in the terminal, which is not specifically limited in this embodiment of the present application.
  • the device provided by the embodiment of the present application can be used to perform the foregoing session establishment method. Therefore, the technical effects that can be obtained by reference to the foregoing method embodiments are not described herein.
  • FIG. 6 shows a schematic structural diagram of a control plane functional entity 600.
  • the control plane function entity 600 includes: a sending module 601 and a receiving module 602.
  • the sending module 601 is configured to send network slice information corresponding to when the PDN connection of the established packet data network is switched to the 5G network; and the established PDN connection switch
  • Corresponding network slice information to the 5G network includes single network slice selection assistance information S-NSSAI of the network slice corresponding to the established PDN connection
  • the receiving module 602 is configured to receive a packet data unit PDU session establishment request, where
  • the PDU session establishment request includes an S-NSSAI of the network slice corresponding to the first PDN connection and a corresponding data network name DNN when the first PDN connection is switched to the 5G network; the first PDN connection is the established Any one of the PDN connections in the PDN connection.
  • the network packet information corresponding to the established packet data network PDN connection when the PDN connection is switched to the 5G network is carried in the protocol configuration item PCO message.
  • the PCO message further includes a DNN corresponding to the established PDN connection when the PDN connection is switched to the 5G network.
  • control plane function entity further includes: a determining module, where the determining module is configured to determine, according to the access point name APN corresponding to the established PDN connection, that the established PDN connection is switched to 5G. Network slice information corresponding to the network.
  • a possible implementation manner is that the sending module 502 is further configured to send indication information, where the indication information is used to indicate that the network slice information sent by the control plane function entity is the home network slice information.
  • the sending module 502 is specifically configured to: determine network slice information corresponding to the home location when the established PDN connection is switched to 5G; Network slice information corresponding to the home location when the established PDN connection is switched to 5G is mapped to the network slice information of the visited place; the network slice information of the corresponding visited place when the established PDN connection is switched to 5G is used as The corresponding slice information is sent to the terminal when the established PDN connection is switched to 5G.
  • the network slice information corresponding to the established PDN connection when the PDN connection is switched to the 5G network further includes an identifier NSI-ID of the network slice instance corresponding to the established PDN connection when the PDN connection is switched to the 5G network.
  • the receiving module 602 is further configured to receive a capability indication from the terminal, where the capability indication is used to indicate that the terminal is capable of switching to a 5G network.
  • the control surface function entity 600 can be implemented on an integrated circuit, a radio frequency integrated circuit, a printed circuit board, or the like. At the same time, the device can be either a stand-alone device or a part of a larger device. In the present embodiment, the control plane functional entity 600 is presented in a form that divides the various functional modules in an integrated manner.
  • a "module” herein may refer to a particular ASIC, circuitry, processor and memory that executes one or more software or firmware programs, integrated logic circuitry, and/or other devices that provide the functionality described above.
  • control surface functional entity 600 can take the form shown in FIG.
  • the processor 201 in FIG. 2 can execute the instruction by calling the computer stored in the memory 203, so that the control plane function entity 600 executes the session establishment method in the above method embodiment.
  • the above embodiments it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof.
  • a software program it may 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 program instructions When the computer program instructions are loaded and executed on a computer, the processes or functions described in accordance with embodiments of the present application are generated in whole or in part.
  • the computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable device.
  • the computer instructions can be stored in a computer readable storage medium or transferred from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions can be from a website site, computer, server or data center Transmission to another website site, computer, server or data center via wired (eg coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (eg infrared, wireless, microwave, etc.).
  • the computer readable storage medium can be any available media that can be accessed by a computer or a data storage device that includes one or more servers, data centers, etc. that can be integrated with the media.
  • the usable medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a DVD), or a semiconductor medium (such as a solid state disk (SSD)) or the like.
  • a magnetic medium eg, a floppy disk, a hard disk, a magnetic tape
  • an optical medium eg, a DVD
  • a semiconductor medium such as a solid state disk (SSD)

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Computer And Data Communications (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

本申请实施例提供会话建立的方法和装置，在终端在跨系统切换时，将已建立的PDN连接切换到5G网络中的网络切片。方法包括：终端接收来自控制面功能实体的已建立的PDN连接切换到5G网络时对应的网络切片信息；已建立的PDN连接切换到5G网络时对应的网络切片信息包括已建立的PDN连接切换到5G网络时对应的网络切片的单网络切片选择辅助信息S-NSSAI；发送PDU会话建立请求，其中，PDU会话建立请求包括第一PDN连接切换到5G网络时对应的网络切片的S-NSSAI以及第一PDN连接切换到5G网络时对应的数据网络名称DNN；第一PDN连接为所述已建立的PDN连接中的任意一个PDN连接。

Description

会话建立方法和装置
本申请要求了2017年11月17日提交的、申请号为201711148057.6、发明名称为“会话建立方法和装置”的中国申请的优先权，以及2018年1月15日提交的、申请号为201810037192.1、发明名称为“会话建立方法和装置”的中国申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信技术领域，尤其涉及会话建立方法和装置。
背景技术
随着无线通信技术的快速发展，第五代(Fifth Generation，5G)移动通信技术应运而生。在网络部署初期，由于5G网络覆盖不足，因此，当用户设备(User Equipment，UE)的位置发生变化时，可能会发生UE在5G网络和第四代(Forth Generation，4G)网络间的切换。
网络切片(network slice)是一个用于支持特定网络能力与网络特性的逻辑隔离的网络，可以端到端(end to end，E2E)的包括整个网络，也可以部分网络功能在多个网络切片中共享，是满足5G移动通信技术关于网络差异化需求的关键技术。
网络切片具体可以由网络切片选择辅助信息(network slice selection assistance information，NSSAI)来表征，当终端接入5G核心网(5G core network，5GC)时，终端提供请求的NSSAI，网络根据NSSAI为终端选择对应的网络切片，并且网络根据终端请求的NSSAI确定终端允许接入的NSSAI，即Allowed NSSAI。
但是，在4G网络中没有网络切片的概念，在4G中每个分组数据网络(packet data network，PDN)连接对应一个接入点名称(access point name，APN)。而在网络切片中创建分组数据单元(packet data unit，PDU)会话时需要数据网络名称(data network name，DNN)和单NSSAI(single NSSAI，S-NSSAI)，在现有的协议中，虽然APN与DNN可以是等价的，但是，在终端从4G网络切换到支持网络切片的5GC时，如何确定终端在4G网络中已建立的PDN连接对应的网络切片的S-NSSAI，以使得可以根据确定的S-NSSAI在5GC的网络切片中建立PDU会话，目前并没有相关的解决方案。
发明内容
本申请实施例提供会话建立方法和装置，使得在终端在跨系统切换时，将已建立的PDN连接切换到5G网络中的网络切片。
为达到上述目的，本申请实施例提供如下技术方案：
第一方面，提供一种会话建立方法，该方法包括：终端接收来自控制面功能实体的已建立的分组数据网络PDN连接切换到5G网络时对应的网络切片信息；所述已建立的PDN连接切换到5G网络时对应的网络切片信息包括所述已建立的PDN连接切换到5G网络时对应的网络切片的单网络切片选择辅助信息S-NSSAI；发送分组数据单元PDU会话建立请求，其中，所述PDU会话建立请求包括第一PDN连接切换到5G网络时对应的网络切片的S-NSSAI以及所述第一PDN连接切换到5G网络时对应的数据网络名 称DNN；所述第一PDN连接为所述已建立的PDN连接中的任意一个PDN连接。其中，终端在4G网络中通过一个或者多个控制面功能实体建立一个或者多个PDN连接。
当终端处于非漫游或者本地分汇(Local breakout,LBO)漫游场景时，该第一PDN连接切换到5G网络时对应的网络切片的S-NSSAI就是终端从控制面功能实体接收到的网络切片的S-NSSAI。
当终端处于归属地路由(Home routed)场景下时，所述第一PDN连接切换到5G网络时对应的网络切片的S-NSSAI为拜访地的网络切片的S-NSSAI。具体的，在发送所述PDU会话建立请求之前，所述方法还包括终端根据归属地网络切片的S-NSSAI与拜访地网络切片的S-NSSAI的映射关系，将从控制面功能实体接收到的第一PDN连接切换到5G网络时对应的网络切片信息映射为拜访地的网络切片的S-NSSAI。
控制面功能实体将已建立的PDN连接切换到5G网络时对应的网络切片信息发送给终端，以便于终端在切换到5G网络时，可以根据相应的网络切片信息在5G网络切片中建立PDU会话。
一种可能的实现方式中，所述已建立的分组数据网络PDN连接切换到5G网络时对应的网络切片信息携带在协议配置项PCO消息中。控制面功能实体通过PCO消息将已建立的PDN连接切换到5G网络时对应的网络切片信息发送给终端，具体的该PCO消息可以通过4G网络中的移动性管理实体(Mobility Management Entity，MME)以及基站发送给终端的。通过PCO消息传递已建立的分组数据网络PDN连接切换到5G网络时对应的网络切片信息，使得MME可以只透传该消息，而不用保存该消息。
一种的可能的实现方式中，所述终端还接收来自所述控制面功能实体的指示信息，所述指示信息用于指示从所述控制面功能实体接收到的网络切片信息为归属地网络切片信息。终端在向网络发送PDU会话建立请求之前，先根据归属地网络切片的S-NSSAI与拜访地的网络切片的S-NSSAI的对应关系，将请求切换的PDN连接切换到5G时对应的归属地网络切片的S-NSSAI映射为请求切换的PDN连接切换到5G时对应的拜访地网络切片的S-NSSAI，然后再将请求切换的PDN连接切换到5G时对应的拜访地网络切片的S-NSSAI携带在PDU会话建立请求中，以触发网络建立一个PDU会话。
一种可能的实现方式中，所述已建立的PDN连接切换到5G网络时对应的网络切片信息还包括所述已建立的PDN连接切换到5G网络时对应的网络切片实例的标识NSI-ID。当网络部署中一个S-NSSAI部署了不止一个网络切片实例时，控制面功能实体发送给终端的PDN连接切换到5G网络时对应的网络切片信息中还包括相应的网络切片实例的标识，从而保证了PDN连接切换后的会话连续性。
一种可能的实现方式中，在所述终端接收来自控制面功能实体的已建立的分组数据网络PDN连接切换到5G网络时对应的网络切片信息之前，所述方法还包括：所述终端向所述控制面功能实体发送能力指示，所述能力指示用于指示所述终端能够切换至5G网络中。具体实现中并不是所有的终端在4G网络中建立PDN连接之后都需要收到已建立的PDN连接切换到5G网络时对应的网络切片信息，例如一个不支持5G网络通信能力的终端，即使收到该信息，也无法使用该信息切换到5G网络中。
可选的，有时并不是所有的PDN连接都能够切换到5G网络中，对于那些不能切换到5G网络中的PDN连接，终端即使发送了PDU会话建立请求，最终会话建立也会失败。为了避免不必要的信令浪费。因此，在所述发送分组数据单元PDU会话建立请求之前，所述方法还包括：所述终端确定所述已建立的PDN连接中能够切换到5G网络中的PDN连接，所述第一PDN连接为所述能够切换到5G的PDN连接中的任意一个PDN连接。其中，述终端确定所述已建立的PDN连接中能够切换到5G网络中的PDN连接，具体包括：所述终端发送注册请求，所述注册请求包括终端请求切换的PDN连接切换到5G网络时对应的网络切片信息，其中，所述终端请求切换的PDN连接为所述已建立的PDN连接中的一部分或者全部PDN连接；接收注册响应，所述注册响应包括所述终端允许接入的网络切片的S-NSSAI；根据所述终端请求切换的PDN连接切换到5G网络时对应的S-NSSAI以及所述允许接入的网络切片的S-NSSAI，确定所述能够切换到5G网络中的PDN连接。
需要说明的是，当终端处于非漫游或者本地分汇(Local breakout,LBO)漫游场景时，所述终端请求切换的PDN连接切换到5G网络时对应的网络切片信息就是终端从控制面功能实体接收到的网络切片信息。
当终端处于归属地路由(Home routed)场景下时，所述终端请求切换的PDN连接切换到5G网络时对应的网络切片信息为拜访地的网络切片信息。具体的，在发送所述PDU会话建立请求之前，所述方法还包括终端根据归属地网络切片的S-NSSAI与拜访地网络切片的S-NSSAI的映射关系，将控制面功能实体发送的网络切片信息映射为拜访地的网络切片信息。
第二方面，提供一种会话建立方法，该方法包括：控制面功能实体通过MME向终端发送已建立的分组数据网络PDN连接切换到5G网络时对应的网络切片信息；所述已建立的PDN连接切换到5G网络时对应的网络切片信息包括所述已建立的PDN连接对应的网络切片的单网络切片选择辅助信息S-NSSAI；接收终端通过AMF发送的分组数据单元PDU会话建立请求，其中，所述PDU会话建立请求包括第一PDN连接对应的网络切片的S-NSSAI以及所述第一PDN连接切换到5G网络时对应的数据网络名称DNN；所述第一PDN连接为所述已建立的PDN连接中的任意一个PDN连接。控制面功能实体将已建立的PDN连接切换到5G网络时对应的网络切片信息发送给终端，以便于终端在切换到5G网络时，可以根据相应的网络切片信息在5G网络切片中建立PDU会话。
一种可能的实现方式中，所述已建立的分组数据网络PDN连接切换到5G网络时对应的网络切片信息携带在协议配置项PCO消息中。控制面功能实体通过PCO消息将已建立的PDN连接切换到5G网络时对应的网络切片信息发送给终端，具体的该PCO消息可以通过4G网络中的移动性管理实体(Mobility Management Entity，MME)以及基站发送给终端的。通过PCO消息传递已建立的分组数据网络PDN连接切换到5G网络时对应的网络切片信息，使得MME可以只透传该消息，而不用保存该消息。
一种可能的实现方式中，所述控制面功能实体具体可以根据所述已建立的PDN连接对应的接入点名称APN，确定所述已建立的PDN连接切换到5G网络时对应的网络切片 信息。
一种可能的实现方式中，在归属地路由的场景下，所述控制面功能实体还向终端发送指示信息，所述指示信息用于指示所述控制面功能实体发送的网络切片信息为归属地网络切片信息，以便于终端接收到该指示信息后，将从控制面功能实体接收到的归属地网络切片信息映射为拜访地网络切片信息。
一种可能的实现方式中，在所述已建立的PDN是在归属地路由场景下建立的情况下，所述控制面功能实体可以确定所述已建立的PDN连接切换到5G时对应的归属地的网络切片信息；然后将所述已建立的PDN连接切换到5G时对应的归属地的网络切片信息映射为拜访地的网络切片信息；并将所述已建立的PDN连接切换到5G时对应的拜访地的网络切片信息作为所述已建立的PDN连接切换到5G时对应的切片信息发送给终端。这样终端接收到的所有网络切片信息都是可以直接使用的，终端本地不需要配置相关的映射表，建立PDU会话时将不需要再区分是否是归属地路由场景。
一种可能的实现方式中，所述已建立的PDN连接切换到5G网络时对应的网络切片信息还包括所述已建立的PDN连接切换到5G网络时对应的网络切片实例的标识NSI-ID。当网络部署中一个S-NSSAI部署了不止一个网络切片实例时，控制面功能实体发送给终端的PDN连接切换到5G网络时对应的网络切片信息中还包括相应的网络切片实例的标识，从而保证了PDN连接切换后的会话连续性。
一种可能的实现方式中，在所述控制面功能实体向终端发送已建立的分组数据网络PDN连接切换到5G网络时对应的网络切片信息之前，所述方法包括：所述控制面功能实体接收来自所述终端的能力指示，所述能力指示用于指示所述终端能够切换至5G网络中。控制面功能实体可能同时为不同的终端建立了PDN连接，但是对于那些不具备5G网络通信能力的或者不需要切换到5G网络中的终端对应的PDN连接，控制面功能实体不需要向这些终端发送PDN连接切换到5G网络时对应的网络切片信息。
第三方面，提供了一种终端，该终端具有实现上述第一方面所述的方法的功能。该功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。该硬件或软件包括一个或多个与上述功能相对应的模块。
第四方面，提供了一种装置，包括：处理器和存储器；该存储器用于存储计算机执行指令，当该装置运行时，该处理器执行该存储器存储的该计算机执行指令，以使该装置执行如上述第一方面中任一所述的会话建立方法。该装置具体可以是第一方面中任一所述的会话建立方法中涉及的终端或者终端中的芯片。
第五方面，提供了一种计算机可读存储介质，该计算机可读存储介质中存储有指令，当其在计算机上运行时，使得计算机可以执行上述第一方面中任意一项所述的会话建立方法。
第六方面，提供了一种包含指令的计算机程序产品，当其在计算机上运行时，使得计算机可以执行上述第一方面中任意一项所述的会话建立方法。
其中，第三方面至第六方面中任一种设计方式所带来的技术效果可参见第一方面中不同设计方式所带来的技术效果，此处不再赘述。
第七方面，提供了一种控制面功能实体，该控制面功能实体具有实现上述第二方面所述的方法的功能。该功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。该硬件或 软件包括一个或多个与上述功能相对应的模块。
第八方面，提供了一种控制面功能实体，包括：处理器和存储器；该存储器用于存储计算机执行指令，当该装置运行时，该处理器执行该存储器存储的该计算机执行指令，以使该装置执行如上述第二方面中任一所述的会话建立方法。
第九方面，提供了一种计算机可读存储介质，该计算机可读存储介质中存储有指令，当其在计算机上运行时，使得计算机可以执行上述第二方面中任意一项所述的会话建立方法。
第十方面，提供了一种包含指令的计算机程序产品，当其在计算机上运行时，使得计算机可以执行上述第二方面中任意一项所述的会话建立方法。
本申请的这些方面或其他方面在以下实施例的描述中会更加简明易懂。
附图说明
图1为4G网络和5G网络互通架构的示意图；
图2为本申请实施例提供的通信设备的硬件结构示意图；
图3为本申请实施例提供的会话建立方法的流程示意图一；
图4为本申请实施例提供的会话建立方法的流程示意图二；
图5为本申请实施例提供的装置的结构示意图；
图6为本申请实施例提供的控制面功能实体的结构示意图。
具体实施方式
为了方便理解本申请实施例的技术方案，首先给出本申请相关技术的简要介绍如下。
NSSAI：
NSSAI中包括多个S-NSSAI。S-NSSAI由切片/服务类型(slice/service type，SST)和切片区分标识(slice differentiator，SD)组成。其中，SST和SD可以由标准定义或者运营商自定义；SD是补充SST的可选信息，以区分相同SST的多个网络切片，例如可以用来表征网络切片的归属关系。23.501标准中定义的NSSAI的类型和作用如表一所示。
表一
Figure PCTCN2018116064-appb-000001
本发明实施例描述的网络架构以及业务场景是为了更加清楚的说明本发明实施例的技术方案，并不构成对于本发明实施例提供的技术方案的限定，本领域普通技术人员可知，随着网络架构的演变和新业务场景的出现，本发明实施例提供的技术方案对于类似的技术问题，同样适用。
本发明的实施例提供一种移动性管理的方法，可应用于如图1所示的4G网络和5G网络互通架构系统100中，如图1所示，包括4G网络与5G网络共用用户面功能(user plane function，UPF)实体+PDN网关用户面功能(PDN gateway user plane function，PGW-U)实体、会话管理功能(session management function，SMF)实体+PDN网关控制面功能(PDN gateway control  plane function，PGW-C)实体、策略控制功能(policy control function，PCF)实体+策略和计费规则功能(policy and charging rules function，PCRF)实体、归属签约用户服务器(home subscriber server，HSS)+统一数据管理(unified data management，UDM)实体。这里“+”表示合设，UPF为5G网络的用户面功能，PGW-U是与UPF对应的4G网络的网关用户面功能，SMF是5G网络的会话管理功能，PGW-C是与SMF对应的4G网络中的网关控制面功能，PCF是5G网络的策略控制功能、PCRF是与PCF对应的4G网络的策略计费规则功能。这里的“合设”是指同一个设备同时具备两个实体的功能。本申请实施例中，为方便表述，将HSS+UDM实体称之为用户数据管理实体，将PGW-C实体+SMF实体称之为控制面功能实体，在此进行统一说明，以下不再赘述。当然，上述合设后的网络设备也可以用其他名称，本申请实施例对此不作具体限定。
此外，如图1所示，上述4G网络和5G网络互通架构中还可以包括MME和服务网关(Serving Gateway，SGW)，以及5G网络中的接入和移动性管理功能(Access and Mobility Management Function，AMF)实体。
其中，终端通过演进型通用陆地无线接入网(evolved universal terrestrial radio access network，E-UTRAN)设备接入4G网络，终端通过下一代无线接入网(next generation radio access network，NG-RAN)设备接入5G网络。E-UTRAN设备通过S1-MME接口与MME通信，E-UTRAN设备通过S1-U接口与SGW通信，MME通过S11接口与SGW通信，MME通过S6a接口与用户数据管理实体通信，MME通过N26接口与AMF实体通信，SGW通过S5-U接口与PGW-U实体+UPF实体通信，SGW通过S5-C接口与PGW-C实体+SMF实体通信，PGW-U实体+UPF实体通过N3接口与NG-RAN设备通信，PGW-U实体+UPF实体通过N4接口与PGW-C实体+SMF实体通信，PGW-C实体+SMF实体通过N7接口与PCRF实体+PCF实体通信，HSS+UDM实体通过N10接口与PGW-C实体+SMF实体通信，HSS+UDM实体通过N8接口与AMF实体通信，PCRF实体+PCF实体通过N15接口与AMF实体通信，PGW-C实体+SMF实体通过N11接口与AMF实体通信，AMF实体通过N2接口与NG-RAN设备通信，AMF实体通过N1接口与终端通信。
需要说明的是，图1中的各个网元之间的接口名字只是一个示例，具体实现中接口名字可能为其他名字，本申请实施例对此不作具体限定。
需要说明的是，5G网络中的NG-RAN设备也可以称之为接入设备，该接入设备指的是接入核心网的设备，例如可以是基站，宽带网络业务网关(broadband network gateway，BNG)，汇聚交换机，非3GPP接入设备等。基站可以包括各种形式的基站，例如：宏基站，微基站(也称为小站)，中继站，接入点等，本申请实施例对此不作具体限定。
当然，4G网络和5G网络中还可以有其它的网元，比如，4G网络中还可以包括通用分组无线系统(general packet radio system，GPRS)业务支撑节点(serving GPRS support node，SGSN)等，5G网络中还可以包括鉴权服务功能(authentication server function，AUSF)实体和网络切片选择功能(network slice selection function，NSSF)实体等，本申请实施例对此不作具体限定。
由于4G网络中的PDN连接由合设的PGW-C/SMF及PGW-U/UPF(即控制面功能实体)进行服务，当终端从4G切换到5G网络后，PDU会话仍然由该PGW-C/SMF和 PGW-U/UPF进行服务，也就是，在切换前后，会话服务的锚点保持不变，从而使得会话的IP地址保存不变。在本申请实施例中，当UE接入4G网络并建立PDN连接时，控制面功能实体将终端已建立的PDN连接切换到5G网络时对应的网络切片信息发送给终端。后续当终端移动到5G覆盖范围内时，终端在向5G网络发送的注册请求中携带该已建立的PDN连接切换到5G网络时对应的网络切片信息。5G网络根据已建立的PDN连接对应的网络切片的信息，确定为UE服务的AMF以及Allowed NSSAI，并将Allowed NSSAI发送给终端。终端根据Allowed NSSAI以及自己在4G网络中已建立的PDN连接切换到5G网络时对应的网络切片信息，可以确定哪些已建立的PDN连接可以切换到5G网络中。针对可切换到5G网络的PDN连接，终端发起PDU会话建立，从而完成跨网络的会话切换。
本申请实施例中所涉及到的终端(terminal)可以包括各种具有无线通信功能的手持设备、车载设备、可穿戴设备、计算设备或连接到无线调制解调器的其它处理设备；还可以包括用户单元(subscriber unit)、蜂窝电话(cellular phone)、智能电话(smart phone)、无线数据卡、个人数字助理(personal digital assistant，PDA)电脑、平板型电脑、无线调制解调器(modem)、手持设备(handheld)、膝上型电脑(laptop computer)、无绳电话(cordless phone)或者无线本地环路(wireless local loop，WLL)台、机器类型通信(machine type communication,MTC)终端、用户设备(user equipment，UE)，移动台(mobile station，MS)，终端设备(terminal device)等。为方便描述，本申请中，上面提到的设备统称为终端。
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行描述。其中，在本申请的描述中，除非另有说明，“多个”是指两个或多于两个。另外，为了便于清楚描述本申请实施例的技术方案，在本申请的实施例中，采用了“第一”、“第二”等字样对功能和作用基本相同的相同项或相似项进行区分。本领域技术人员可以理解“第一”、“第二”等字样并不对数量和执行次序进行限定，并且“第一”、“第二”等字样也并不限定一定不同。
如图2所示，图1所示的节点，如终端、MME、AMF、SMF实体+PGW-C实体、E-UTRAN或NG-RAN等，可以以图2中的通信设备(或系统)的方式来实现。
图2所示为本申请实施例提供的通信设备的硬件结构示意图。该通信设备200包括至少一个处理器201，通信线路202，存储器203以及至少一个通信接口204。
处理器201可以是一个通用中央处理器(central processing unit，CPU)，微处理器，特定应用集成电路(application-specific integrated circuit，ASIC)，或一个或多个用于控制本申请方案程序执行的集成电路。
通信线路202可包括一通路，在上述组件之间传送信息。
通信接口204，使用任何收发器一类的装置，用于与其他设备或通信网络通信，如以太网，无线接入网(radio access network，RAN)，无线局域网(wireless local area networks，WLAN)等。
存储器203可以是只读存储器(read-only memory，ROM)或可存储静态信息和指令的其他类型的静态存储设备，随机存取存储器(random access memory，RAM)或者可存储信息和指令的其他类型的动态存储设备，也可以是电可擦可编程只读存储器(electrically erasable programmable read-only memory，EEPROM)、只读光盘(compact disc read-only memory，CD-ROM)或其他光盘存储、光碟存储(包括压缩 光碟、激光碟、光碟、数字通用光碟、蓝光光碟等)、磁盘存储介质或者其他磁存储设备、或者能够用于携带或存储具有指令或数据结构形式的期望的程序代码并能够由计算机存取的任何其他介质，但不限于此。存储器可以是独立存在，通过通信线路302与处理器相连接。存储器也可以和处理器集成在一起。
其中，存储器203用于存储执行本申请方案的计算机执行指令，并由处理器201来控制执行。处理器201用于执行存储器203中存储的计算机执行指令，从而实现本申请下述实施例提供的会话建立方法。
可选的，本申请实施例中的计算机执行指令也可以称之为应用程序代码，本申请实施例对此不作具体限定。
在具体实现中，作为一种实施例，处理器201可以包括一个或多个CPU，例如图2中的CPU0和CPU1。
在具体实现中，作为一种实施例，通信设备200可以包括多个处理器，例如图2中的处理器201和处理器208。这些处理器中的每一个可以是一个单核(single-CPU)处理器，也可以是一个多核(multi-CPU)处理器。这里的处理器可以指一个或多个设备、电路、和/或用于处理数据(例如计算机程序指令)的处理核。
在具体实现中，作为一种实施例，通信设备200还可以包括输出设备205和输入设备206。输出设备205和处理器201通信，可以以多种方式来显示信息。例如，输出设备205可以是液晶显示器(liquid crystal display，LCD)，发光二级管(light emitting diode，LED)显示设备，阴极射线管(cathode ray tube，CRT)显示设备，或投影仪(projector)等。输入设备306和处理器301通信，可以以多种方式接收用户的输入。例如，输入设备206可以是鼠标、键盘、触摸屏设备或传感设备等。
上述的通信设备200可以是一个通用设备或者是一个专用设备。在具体实现中，通信设备200可以是台式机、便携式电脑、网络服务器、掌上电脑(personal digital assistant，PDA)、移动手机、平板电脑、无线终端设备、嵌入式设备或有图2中类似结构的设备。本申请实施例不限定通信设备200的类型。
下面将结合图1和图2，对本申请实施例提供的会话建立方法进行具体阐述。
如图3所示，为本申请实施例提供的一种会话建立方法。本实施例中，终端先通过E-UTRAN设备接入4G网络，在4G网络中建立了PDN连接。后续由于终端位置移动到5G服务范围内，终端通过NG-RAN设备接入5G网络。本申请实施例适用于非漫游或者LBO漫游场景。该方法包括如下步骤：
步骤301、终端在4G网络建立PDN连接。
PDN连接的建立可能是在附着的过程中建立的，或者在附着之后由终端发起建立的。PDN连接建立的过程参见现有协议，在此不予赘述。
可选的，在终端建立PDN连接的情况下，终端确定自己后续有可能会切换到5G网络中，例如确定自身具有支持5G网络的能力，则终端向控制面功能功能实体发送能力指示，该能力指示用于指示终端后续能够切换到5G网络中，该能力指示可以是终端支 持5G的能力信息(例如终端支持5G NAS的指示)。终端向控制面功能功能实体发送能力指示，具体包括：终端在附着到4G网络时，向MME发送该能力指示，以便于在PDN连接建立过程中MME通过SGW将该能力指示发送给控制面功能实体；或者，终端向控制面功能实体发送协议配置项(protocol configuration option，PCO)消息，该PCO消息中携带所述能力指示。
需要说明的是，终端在4G网络中可能建立了一个或者多个PDN连接，并且该一个或者多个PDN连接可能是由一个或者多个控制面功能实体服务，本申请实施例对此不作限定。为便于描述，本申请实施例仅以终端通过一个控制面功能实例建立一个或多个PDN连接为例。
步骤302、控制面功能实体获取已建立的PDN连接切换到5G时对应的网络切片信息，并将该网络切片信息发送给终端，以便于终端接收到该已建立的PDN连接切换到5G时对应的网络切片信息。
其中，所述已建立的PDN连接包括一个或者多个PDN连接。在实际部署中，5G中的PDU会话都是跟网络切片实例关联的，一个网络切片实例可以由网络切片实例标识(network slice instance ID，NSI-ID)来指示。而一个由S-NSSAI标识的网络切片可能有多个网络切片实例(比如，不同的网络切片实例可以实现负载分担)，另外，一个网络切片实例可以支持一个或者多个数据网络，其中，数据网络可以用数据网络名称(Data Network Name，DNN)来标识。
因此，根据网络部署的情况，为了将终端在4G网络中已建立的PDN连接切换到5G网络中的网络切片实例里的PDU会话，控制面功能实体发送给终端的PDN连接切换到5G时对应的网络切片信息，可以包括不同的内容。由于控制面功能实体是位于网络切片实例内的，当该控制面功能实体支持多个网络切片时，控制面功能实体可以获取其所支持的的不同网络切片实例所对应的S-NSSAI、网络切片实例的标识NSI-ID，以及该网络切片实例支持的一个或多个数据网络名称。所述已建立的PDN连接切换到5G时对应的网络切片信息包括已建立的PDN连接切换到5G时对应的网络切片的S-NSSAI，可选的，还包括所述已建立的PDN连接切换到5G网络时对应的网络切片实例的标识NSI-ID。当终端切换到5G网络时所使用的DNN与4G中的APN不相同时，可选的，控制面功能实体还需要获取终端切换到5G网络时所使用的DNN，并将其发送给终端。具体的，
一种可能的实现方式中，根据网络部署的情况，在控制面功能实体中预先配置有PDN连接与S-NSSAI的对应关系，所述控制面功能实体获取已建立的PDN连接切换到5G时对应的网络切片信息，包括：所述控制面功能实体根据所述已建立的PDN连接的信息，以及预先配置的PDN连接与S-NSSAI的对应关系，获取所述已建立的PDN连接对应的网络切片的S-NSSAI。在该网络部署下，PDN连接切换到5G时所使用的DNN与在4G中的APN是相同的，且每一个S-NSSAI只部署了一个网络切片实例。
示例性的，假设预先配置的PDN连接与S-NSSAI的对应关系如表二所示：
表二
PDN连接的信息 S-NSSAI
PDN连接1 S-NSSAI1
PDN连接2 S-NSSAI2
PDN连接3 S-NSSAI3
…… ……
另一种可能的实现方式中，根据网络部署的情况，在控制面功能实体中预先配置有PDN连接与S-NSSAI以及DNN的对应关系，所述控制面功能实体获取已建立的PDN连接切换到5G时对应的网络切片信息，包括：所述控制面功能实体根据所述已建立的PDN连接的信息，以及预先配置的PDN连接与S-NSSAI以及DNN的对应关系，获取所述已建立的PDN连接切换到5G网络时对应的网络切片的S-NSSAI以及已建立的PDN连接切换到5G时所使用的DNN。在该网络部署下，PDN连接切换到5G时所使用的DNN与在4G中的APN是有可能不相同的，且每一个S-NSSAI只部署了一个网络切片实例。
示例性的，假设预先配置的PDN连接与S-NSSAI以及DNN的对应关系如表三所示：
表三
PDN连接的信息 S-NSSAI DNN
PDN连接1 S-NSSAI1 DNN1
PDN连接2 S-NSSAI2 DNN2
…… …… ……
另一种可能的实现方式中，根据网络部署的情况，在控制面功能实体中预先配置有PDN连接与S-NSSAI、DNN以及NSI-ID的对应关系，所述控制面功能实体获取已建立的PDN连接切换到5G时对应的网络切片信息，包括：所述控制面功能实体根据所述已建立的PDN连接的信息，以及预先配置的PDN连接与S-NSSAI、DNN以及NSI-ID的对应关系，获取所述已建立的PDN连接切换到5G时对应的网络切片的S-NSSAI、已建立的PDN连接切换到5G时所使用的DNN以及所述已建立的PDN连接切换到5G时对应的网络切片实例的标识NSI-ID。在该网络部署下，PDN连接切换到5G时所使用的DNN与在4G中的APN是有可能不相同的，且每一个S-NSSAI可能部署了不止一个网络切片实例。
示例性的，假设预先配置的PDN连接与S-NSSAI、DNN以及NSI-ID的对应关系如表四所示：
表四
Figure PCTCN2018116064-appb-000002
Figure PCTCN2018116064-appb-000003
其中，PDN连接可以由PDN连接对应的APN来表征，即已建立的PDN连接的信息具体可以包括已建立的PDN连接对应的APN，可选的，还可以由PDN连接对应的APN和相关的签约信息来表征。本申请实施例对于PDN连接的信息的具体形式不做限定。
具体实现中，控制面功能实体可以在PDN连接建立响应或者终端的附着响应中，通过PCO消息将已建立PDN连接切换到5G时对应的网络切片信息发送给终端。可选的，控制面功能实体发送给终端的PCO消息中还包括已建立的PDN连接切换到5G时所使用的DNN。
步骤303、当终端移动到5G网络覆盖范围时，终端发起注册请求，所述注册请求包括终端请求切换的PDN连接切换到5G时对应的网络切片信息，所述注册请求通过接入设备(如基站)发送给AMF，以便于所述AMF接收所述注册请求。其中，所述终端请求切换的PDN连接为所述已建立的PDN连接中的一部分或者全部PDN连接。
具体的，当终端在步骤302中接收到来自控制面功能实体的已建立的PDN连接切换到5G时对应的网络切片信息后，根据自身的策略需求，确定请求切换的PDN连接以及该请求切换的PDN连接切换到5G时对应的网络切片信息。例如，用户通过安装在终端上的APP1和APP2分别触发建立了PDN连接1和PDN连接2，控制面功能实体向终端返回该PDN连接1切换到5G时对应的网络切片信息以及该PDN连接2切换到5G时对应的网络切片信息；此时终端监测到APP1和APP2设置了切换策略(可以是用户设置的，也可以是应用自带的)，如APP1禁止切换到5G网络，APP2在有5G覆盖的情况下优先切换到5G等，则终端确定PDN连接2为请求切换的PDN连接，PDN连接2切换到5G时对应的网络切片信息为请求切换的PDN连接切换到5G时对应的网络切片信息。
具体的，终端向5G网络发起注册请求时，如果携带S-NSSAI，那么接入设备将根据注册请求中携带的S-NSSAI来选择AMF。本申请实施例中，终端在注册请求中携带请求切换的PDN连接切换到5G时对应的网络切片的S-NSSAI，可选的，还可以携带终端请求的其他S-NSSAI。接入设备根据请求切换的PDN连接切换到5G时对应的网络切片的S-NSSAI和终端请求的其他S-NSSAI选择AMF，并将注册请求转发给选择的AMF，以便于AMF接收终端发送的注册请求。
具体地，终端可将请求切换的PDN连接切换到5G时对应的网络切片的S-NSSAI和终端请求的其他S-NSSAI都放在“requested NSSAI”中发送给AMF，并且，终端通知AMF“requested NSSAI”中哪些S-NSSAI对应已建立的PDN连接；或者，终端将其他请求的S-NSSAI放在“requested NSSAI”中，将请求切换的PDN连接切换到5G时对应的网络切片的S-NSSAI放在另外一个单独的NSSAI中发送给AMF。本申请实施例对于终端如何将请求切换的PDN连接切换到5G时对应的网络切片的S-NSSAI通过注册请求发送给AMF的方法不做限定。
可选的，所述注册请求中还包括终端的标识。AMF在收到终端的注册请求后可能会 对终端进行认证等过程，并最终获得终端的永久标识(SUPI,Subscription Permanent Identifier)，具体参见相关标准协议，本申请实施例不做赘述。
步骤304、AMF获取终端的签约数据，所述终端的签约数据包括终端的网络切片签约数据以及请求切换的PDN连接对应的APN与控制面功能实体的标识的对应关系。
具体的，AMF根据注册请求中的终端标识(或SUPI)获取终端的签约数据：优先从AMF本地获取终端的签约数据，如果本地没有终端的签约数据，则从用户数据管理实体中获取终端的签约数据，可选的，AMF还将终端的签约数据保存在终端对应的上下文中。
其中，终端的网络切片签约数包括签约的网络切片对应的S-NSSAI，可选的，还包括签约的网络切片对应的DNN等信息。
步骤305、AMF获取终端允许接入的网络切片对应的S-NSSAI(即Allowed NSSAI)。
具体的，AMF可以根据请求切换的PDN连接切换到5G时对应网络切片信息和终端的签约数据等信息获得Allowed NSSAI。
一种可能的实现方式中，AMF自身根据请求切换的PDN连接切换到5G时对应网络切片信息以及终端的签约数据等信息确定Allowed NSSAI。可选的，AMF还可以进一步依据终端请求的其他S-NSSAI来确定Allowed NSSAI。
例如，当请求切换的PDN连接切换到5G时对应的网络切片信息包括请求切换的PDN连接切换到5G时对应的网络切片的S-NSSAI时，AMF将请求切换的PDN连接对应的网络切片的S-NSSAI和终端请求的其他S-NSSAI取并集，然后再与终端的签约的网络切片对应的S-NSSAI和AMF所支持的网络切片对应的S-NSSAI取交集确定Allowed NSSAI。当请求切换的PDN连接切换到5G时对应的网络切片信息包括请求切换的PDN连接对应的网络切片的S-NSSAI和请求切换的PDN连接切换到5G时对应的网络切片实例的标识NSI-ID时，AMF除了做上述判断之外，还根据请求切换的PDN连接切换到5G时对应的网络切片实例的标识NSI-ID，剔除自身不能服务的网络切片实例对应的PDN连接。
比如，请求切换的PDN连接对应的网络切片的S-NSSAI为S-NSSAI1和S-NSSAI2，终端请求的其他S-NSSAI为S-NSSAI3和S-NSSAI4，终端的签约的网络切片对应的S-NSSAI为S-NSSAI1、S-NSSAI3和S-NSSAI5，AMF所支持的网络切片对应的S-NSSAI包括S-NSSAI1、S-NSSAI12、S-NSSAI13、S-NSSAI14、S-NSSAI15，则AMF将请求切换的PDN连接对应的网络切片的S-NSSAI和终端请求的其他S-NSSAI取并集得到S-NSSAI1、S-NSSAI2、S-NSSAI3和S-NSSAI4，然后再与终端的签约的网络切片对应的S-NSSAI和AMF所支持的网络切片对应的S-NSSAI取交集得到S-NSSAI1和S-NSSAI3，从而确定Allowed NSSAI包括S-NSSAI1和S-NSSAI3。
另一种可能的实现方式中，AMF请求网络切片选择功能(network slice selection function，NSSF)实体为终端确定Allowed NSSAI。具体的，AMF向NSSF发送切片选择请求，切片选择请求包括请求切换的PDN连接切换到5G时对应网络切片信息和终端的签约数据，可选的，还包括终端请求的其他S-NSSAI。NSSF根据请求切换的PDN连 接切换到5G时对应网络切片信息和终端的签约数据，可选的，还根据终端请求的其他S-NSSAI，确定Allowed NSSAI以及与Allowed NSSAI对应的目标AMF集合。具体的，当请求切换的PDN连接切换到5G时对应的网络切片信息包括请求切换的PDN连接切换到5G时对应的网络切片的S-NSSAI时，NSSF将请求切换的PDN连接切换到5G时对应的网络切片的S-NSSAI和终端请求的其他S-NSSAI取并集，然后再与终端的签约的网络切片对应的S-NSSAI取交集确定第一NSSAI，然后再集合终端的位置、网络中AMF的部署情况等信息，确定Allowed NSSAI和Allowed NSSAI对应的目标AMF集合，其中，Allowed NSSAI为第一NSSAI中一部分或者全部NSSAI，所述目标AMF集合中的任何一个AMF都可以同时服务Allowed NSSAI所对应的任何一个网络切片。可选地，NSSF可以从目标AMF集合中选择目标AMF。
NSSF将Allowed NSSAI及目标AMF集合(或从目标AMF集合中选定的目标AMF)发送给AMF。本申请实施例中，AMF和NSSF还可能采用其他方法来确认Allowed NSSAI，本申请实施例对于AMF和NSSF采用何种方法来确认Allowed NSSA不做限定。
AMF根据NSSF返回的目标AMF集合或目标AMF决定是否需要将终端重定向到其他AMF处理，若需要，则AMF将终端重定向到其他AMF。重定向的方法为公众所熟知，本申请实施例不做赘述。本申请实施例默认AMF包含在目标AMF集合中，即AMF不需要将终端重定向到其他AMF处理。
步骤306、AMF向终端发送注册响应，以便于所述终端接收所述注册响应；其中，所述注册响应包括终端允许接入的网络切片对应的S-NSSAI，即Allowed NSSAI。
步骤307、终端确定能够切换到5G网络中的PDN连接。
具体的，终端根据允许接入的网络切片对应的S-NSSAI，以及请求切换的PDN连接切换到5G时对应的网络切片信息确定能够切换到5G网络中的PDN连接。例如，终端允许接入的网络切片对应的S-NSSAI为S-NSSAI1和S-NSSAI3，请求切换的PDN连接对应的网络切片的S-NSSAI为S-NSSAI1和S-NSSAI2，则终端确定PDN连接对应的网络切片的S-NSSAI为S-NSSAI1的PDN连接能够切换到5G网络。
对于每一个能够切换到5G网络中的PDN连接，执行以下步骤，将PDN连接切换到5G网络中的PDU会话中。
步骤308、终端向AMF发送PDU会话建立请求，以便于所述AMF接收所述终端发送的PDU会话建立请求，其中，所述PDU会话建立请求包括第一PDN连接对应的网络切片的S-NSSAI和第一PDN连接切换到5G时所使用的DNN。其中，所述第一PDN连接为所述能够切换的PDN连接中的任意一个PDN连接。
具体的，当步骤302中，控制面功能实体没有将已建立的PDN连接切换到5G时所使用的DNN发送给终端时，终端默认为已建立的PDN连接切换到5G时所使用的DNN与在4G中的APN是相同的。因此，所述第一PDN连接切换到5G时所使用的DNN等于第一PDN连接对应的APN。
当步骤302中，控制面功能实体将已建立的PDN连接切换到5G时所使用的DNN发送给终端时，终端默认为已建立的PDN连接切换到5G时所使用的DNN与在4G中 的APN不同。因此，所述PDU会话建立请求还包括第一PDN连接对应的APN。
需要说明的是，当PDN连接建立之后，终端会保持已建立的PDN连接对应的APN。
步骤309、AMF确定控制面功能实体，并向确定的控制面功能实体转发所述PDU会话建立请求以便于所述控制面功能实体接收所述PDU会话建立请求。
AMF根据第一PDN连接对应的APN，以及APN与控制面功能实体的标识的对应关系，确定控制面功能实体。
具体的，当AMF接收的PDU会话建立请求包括第一PDN连接对应的网络切片的S-NSSAI和第一PDN连接切换到5G时所使用的DNN时，则AMF确定第一PDN连接对应的APN等于第一PDN连接切换到5G时所使用的DNN，并根据第一PDN连接对应的APN，以及APN与控制面功能实体的标识的对应关系，确定控制面功能实体。当AMF接收的PDU会话建立请求包括第一PDN连接对应的网络切片的S-NSSAI、第一PDN连接切换到5G时所使用的DNN以及第一PDN连接对应的APN时，AMF根据第一PDN连接对应的APN，以及APN与控制面功能实体的标识的对应关系，确定控制面功能实体。
步骤310、在PDN连接对应的网络切片实例中建立PDU会话。
PDU会话建立的后续流程与现有协议相同，此处不再赘述。
本申请实施例中，当UE在4G网络中已经建立PDN连接时，由控制面功能实体确定该已建立的PDN连接切换到5G时所对应的网络切片信息并通过PCO发送给UE，后续UE注册到5GC时携带上述网络切片信息，从而有助于5GC选择支持已建立PDN连接对应的5G网络切片，从而保证会话的IP地址保持不变。
如图4所示，为本申请实施例提供的又一种会话建立方法。本实施例中，终端先通过E-UTRAN设备接入4G网络，在4G网络中建立了PDN连接。后续由于终端位置移动到5G服务范围内，终端通过NG-RAN设备接入5G网络。本申请实施例适用于漫游时从HPLMN(Home public land mobile operator network，归属地运营商网络)路由的场景(归属地路由)，在本申请实施例中归属地控制面功能实体位于HPLMN。该方法包括如下步骤：
步骤401、终端在4G网络建立PDN连接。
步骤402、归属地控制面功能实体获取已建立的PDN连接切换到5G时对应的网络切片信息，并将该网络切片信息发送给终端，以便于终端接收到该已建立的PDN连接切换到5G时对应的网络切片信息。
步骤401与步骤301相同，步骤402与步骤302相同，相关描述参考上述实施例的相关步骤，这里不再赘述。需要说明的是，在一种实现方式中，归属地控制面功能实体给终端发送的该PDN连接切换到5G时对应的网络切片信息是归属地对应的网络切片信息(如S-NSSAI)。若归属地控制面功能实体发送给UE的网络切片信息是归属地对应的网络切片信息，则归属地控制面功能实体将指示该PDN连接是归属地路由的指示信息发送给UE，该指示信息用于指示从控制面功能实体接收到的网络切片信息为归属地网络切 片信息，以便于UE根据归属地PLMN ID、归属地S-NSSAI和UE配置的归属地到拜访地的S-NSSAI的映射关系将归属地对应的S-NSSAI映射为拜访地对应的S-NSSAI，该归属地路由指示信息可以是归属地的PLMN ID或者一个是否是归属地路由的标识。
在另外一种实现方式中，归属地控制面功能实体给终端发送的PDN连接切换到5G时对应的网络切片信息是拜访地对应的S-NSSAI，此时，归属地控制面功能实体将该PDN连接切换到5G时对应的归属地的网络切片信息映射为拜访地的网络切片信息。具体地，归属地控制面功能实体先按步骤302的方法确定PDN连接切换到5G时对应的归属地的网络切片信息，再将PDN连接切换到5G时对应的归属地的网络切片信息映射为拜访地的网络切片信息。归属地控制面功能实体从MME获取终端当前接入的拜访地的PLMN ID，再根据归属地控制面功能实体配置的拜访地S-NSSAI与归属地S-NSSAI的映射关系将归属地的网络切片信息映射为拜访地的网络切片信息，如下表所示：
归属地PLMN ID 归属地S-NSSAI 拜访地PLMN ID 拜访地S-NSSAI
PLMN ID 1 S-NSSAI1 PLMN ID 2 S-NSSAI12
PLMN ID 1 S-NSSAI2 PLMN ID 2 S-NSSAI22
PLMN ID 1 S-NSSAI1 PLMN ID3 S-NSSAI13
可选地，控制面功能实体还可请求NSSF将归属地对应的S-NSSAI映射为拜访地对应的S-NSSAI。具体地，控制面功能实体将归属地PLMN ID、归属地S-NSSAI、拜访地PLMN ID发送给NSSF，NSSF给控制面功能实体返回拜访地对应的S-NSSAI。
步骤403、当终端移动到5G网络覆盖范围时，终端发起注册请求，所述注册请求包括终端请求切换的PDN连接切换到5G时对应的网络切片信息，所述注册请求通过接入设备(如基站)发送给AMF，以便于所述AMF接收所述注册请求。若终端在步骤402中收到归属地路由指示信息，则终端将收到的归属地对应的网络切片信息映射为拜访地对应的网络切片信息。终端根据归属地对应的网络切片信息、归属地PLMN ID和UE配置的归属地和拜访地对应的网络切片信息的映射关系，将归属地对应的网络切片信息映射为拜访地对应的网络切片信息。其中，所述终端请求切换的PDN连接为所述已建立的PDN连接中的一部分或者全部PDN连接。
步骤404、AMF获取终端的签约数据，所终端的签约数据包括终端的网络切片签约数据以及请求切换的PDN连接对应的APN与控制面功能实体的标识的对应关系。
步骤404与步骤304相同，相关描述参考上述实施例的相关步骤，这里不再赘述。
步骤405、AMF获取终端允许接入的网络切片对应的S-NSSAI(即Allowed NSSAI)。
一种可能的实现方式中，步骤403中除了AMF为拜访地的AMF，而步骤303中的AMF为归属地的AMF外，其余具体的实施方式相同，此时，步骤405中，AMF根据归属地网络切片的S-NSSAI与拜访地的网络切片的S-NSSAI的对应关系，将已建立的PDN连接切换到5G时对应的网络切片的S-NSSAI映射为拜访地的网络切片的S-NSSAI，以及将用户签约的网络切片的S-NSSAI也映射为拜访地的网络切片的S-NSSAI，然后再确定终端允许接入的拜访地网络切片对应的S-NSSAI。具体确定的方法同步骤305，这里 不再赘述。
另外一种可能的实现方式中，步骤403中终端请求切换的PDN连接切换到5G时对应的网络切片信息是终端根据归属地网络切片的S-NSSAI与拜访地的网络切片的S-NSSAI的对应关系，将请求切换的PDN连接切换到5G时对应的网络切片的S-NSSAI映射为请求切换的PDN连接切换到5G时对应的拜访地网络切片的S-NSSAI。即相对于步骤302而言，当终端确定好请求切换的PDN连接之后，还需要根据归属地网络切片的S-NSSAI与拜访地的网络切片的S-NSSAI的对应关系，将请求切换的PDN连接切换到5G时对应的网络切片的S-NSSAI映射为请求切换的PDN连接切换到5G时对应的拜访地网络切片的S-NSSAI。则步骤405中，AMF根据归属地网络切片的S-NSSAI与拜访地的网络切片的S-NSSAI的对应关系，将用户签约的网络切片的S-NSSAI也映射为拜访地的网络切片的S-NSSAI，然后再根据用户签约的网络切片的S-NSSAI对应的拜访地的网络切片的S-NSSAI以及终端请求切换的PDN连接切换到5G时对应的拜访地网络切片的S-NSSAI确定终端允许接入的拜访地网络切片对应的S-NSSAI。具体确定的方法同步骤305，这里不再赘述。
步骤406、AMF向终端发送注册响应，以便于所述终端接收所述注册响应；其中，所述注册响应包括终端允许接入的拜访地网络切片对应的S-NSSAI，即Allowed NSSAI。
步骤407、终端确定能够切换到5G网络中的PDN连接。
参考步骤307，与步骤307不同的地方在于，若终端接收到的PDN连接切换到5G时对应的网络切片信息是归属地的S-NSSAI，则终端根据归属地网络切片的S-NSSAI与拜访地的网络切片的S-NSSAI的对应关系，将请求切换的PDN连接对应的网络切片的S-NSSAI映射为请求切换的PDN连接切换到5G时对应的拜访地网络切片的S-NSSAI，然后再结合步骤406中接收到的终端允许接入的拜访地网络切片对应的S-NSSAI，确定能够切换到5G网络中的PDN连接。
对于每一个能够切换到5G网络中的PDN连接，执行以下步骤，将PDN连接切换到5G网络中的PDU会话中。
步骤408、终端向AMF发送PDU会话建立请求，以便于所述AMF接收所述终端发送的PDU会话建立请求，其中，所述PDU会话建立请求包括第一PDN连接切换到5G网络时对应的拜访地网络切片的S-NSSAI和第一PDN连接切换到5G时所使用的DNN。其中，所述第一PDN连接为所述能够切换的PDN连接中的任意一个PDN连接。
具体的，当步骤402中，归属地控制面功能实体没有将已建立的PDN连接切换到5G时所使用的DNN发送给终端时，终端默认为已建立的PDN连接切换到5G时所使用的DNN与在4G中的APN是相同的。因此，所述第一PDN连接切换到5G时所使用的DNN等于第一PDN连接对应的APN。
当步骤402中，归属地控制面功能实体将已建立的PDN连接切换到5G时所使用的DNN发送给终端时，终端默认为已建立的PDN连接切换到5G时所使用的DNN与在4G中的APN不同。因此，所述PDU会话建立请求还包括第一PDN连接对应的APN。
需要说明的是，当PDN连接建立之后，终端会保持已建立的PDN连接对应的APN。
可选地，若UE在402步收到了归属地网络切片实例的标识，则UE将归属地网络切片实例的标识信息发送给AMF。
步骤409、AMF确定拜访地控制面功能实体以及归属地控制面功能实体，并向确定的拜访地控制面功能实体转发所述PDU会话建立请求以便于所述拜访地控制面功能实体接收所述PDU会话建立请求。
具体的，所述AMF确定归属地控制面功能实体，包括：AMF从用户数据管理实体处获取所述终端的PDN连接上下文信息，所述PDN连接上下文信息中包括PDN连接对应的APN与归属地控制面功能实体的标识的对应关系。当AMF接收的PDU会话建立请求包括第一PDN连接对应的拜访地网络切片的S-NSSAI和第一PDN连接切换到5G时所使用的DNN时，则AMF确定第一PDN连接对应的APN等于第一PDN连接切换到5G时所使用的DNN，并根据第一PDN连接对应的APN，以及APN与归属地控制面功能实体的标识的对应关系，确定归属地控制面功能实体。当AMF接收的PDU会话建立请求包括第一PDN连接对应的拜访地网络切片的S-NSSAI、第一PDN连接切换到5G时所使用的DNN以及第一PDN连接对应的APN时，AMF根据第一PDN连接对应的APN，以及APN与归属地控制面功能实体的标识的对应关系，确定归属地控制面功能实体。
AMF确定拜访地控制面功能实体，具体包括：AMF根据第一PDN连接对应的拜访地网络切片的S-NSSAI以及第一PDN连接切换到5G时所使用的DNN，确定拜访地控制面功能实体。具体的，AMF可以根据本地配置或者通过查询网络功能仓库功能(network function repository function，NRF)实体来确定拜访地控制面功能实体，具体的确定过程参考现有协议，这里不再赘述。若AMF在408步从UE收到了归属地网络切片实例标识，AMF在选择拜访地控制面功能实体时还根据归属地网络切片实例标识进行选择，所选择的拜访地控制面功能实体可以与归属地的网络切片实例互通。
步骤410、AMF向拜访地控制面功能实体转发PDU会话建立请求以及归属地控制面功能实体的标识。
步骤411、拜访地控制面功能实体根据归属地控制面功能实体的标识，向归属地控制面功能实体发送PDU会话建立请求。
步骤412、在PDN连接对应的网络切片实例中建立PDU会话。
PDU会话建立的后续流程与现有协议相同，此处不再赘述。
本申请实施例中，当UE在4G网络中已经建立PDN连接时，由归属地控制面功能实体确定该已建立的PDN连接切换到5G时所对应的网络切片信息并通过PCO发送给UE，后续UE注册到5GC时携带上述网络切片信息映射到拜访地的网络切片的网络切片信息，从而有助于5GC选择支持已建立PDN连接对应的5G网络切片，从而保证会话的IP地址保持不变。
其中，上述图3和图4实施例中各个网元(如终端、控制面功能实体等)的动作可以由图2所示的通信设备200中的处理器201调用存储器203中存储的应用程序代码来执行，本申请实施例对此不作任何限制。
上述主要从各个网元之间交互的角度对本申请实施例提供的方案进行了介绍。可以理解的是，上述终端、AMF和控制面功能实体等设备为了实现上述功能，其包含了执行各个功能相应的硬件结构和/或软件模块。本领域技术人员应该很容易意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，本申请能够以硬件或硬件和计算机软件的结合形式来实现。某个功能究竟以硬件还是计算机软件驱动硬件的方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
本申请实施例可以根据上述方法示例对终端和控制面功能实体等设备进行功能模块的划分，例如，可以对应各个功能划分各个功能模块，也可以将两个或两个以上的功能集成在一个处理模块中。上述集成的模块既可以采用硬件的形式实现，也可以采用软件功能模块的形式实现。需要说明的是，本申请实施例中对模块的划分是示意性的，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式。
比如，以采用集成的方式划分各个功能模块的情况下，图5示一种装置500的结构示意图。该装置500可以是上述实施例中的终端，也可以是终端内的芯片，本申请实施例对此不作具体限定。如图5所示，该装置包括：接收模块501和发送模块502；其中，所述接收模块501，用于接收来自控制面功能实体的已建立的分组数据网络PDN连接切换到5G网络时对应的网络切片信息；所述已建立的PDN连接切换到5G网络时对应的网络切片信息包括所述已建立的PDN连接切换到5G网络时对应的网络切片的单网络切片选择辅助信息S-NSSAI；所述发送模块502，用于发送分组数据单元PDU会话建立请求，其中，所述PDU会话建立请求包括第一PDN连接切换到5G网络时对应的网络切片的S-NSSAI以及所述第一PDN连接切换到5G网络时对应的数据网络名称DNN；所述第一PDN连接为所述已建立的PDN连接中的任意一个PDN连接。
可选的，所述已建立的分组数据网络PDN连接切换到5G网络时对应的网络切片信息携带在协议配置项PCO消息中。
可选的，所述接收模块501，还用于接收来自所述控制面功能实体的指示信息，所述指示信息用于指示从所述控制面功能实体接收到的网络切片信息为归属地网络切片信息。
所述终端还包括：映射模块；所述映射模块，用于根据归属地网络切片的S-NSSAI与拜访地的网络切片的S-NSSAI的对应关系，将请求切换的PDN连接切换到5G时对应的归属地网络切片的S-NSSAI映射为请求切换的PDN连接切换到5G时对应的拜访地网络切片的S-NSSAI。
可选的，所述已建立的PDN连接切换到5G网络时对应的网络切片信息还包括所述已建立的PDN连接切换到5G网络时对应的网络切片实例的标识NSI-ID。
在一种可能的实现方式中，所述发送模块502，还用于向所述控制面功能实体发送能力指示，所述能力指示用于指示所述终端能够切换至5G网络中。
所述装置还包括确定模块，所述确定模块，用于确定所述已建立的PDN连接中能够切换到5G网络中的PDN连接，所述第一PDN连接为所述能够切换到5G的PDN连接 中的任意一个PDN连接。
所述装置还包括确定模块503，所述确定模块503，用于确定所述已建立的PDN连接中能够切换到5G网络中的PDN连接，所述第一PDN连接为所述能够切换到5G的PDN连接中的任意一个PDN连接。一种可能的实现方式中，所述确定模块503，具体用于发送注册请求，所述注册请求包括终端请求切换的PDN连接切换到5G网络时对应的网络切片信息，其中，所述终端请求切换的PDN连接为所述已建立的PDN连接中的一部分或者全部PDN连接；接收注册响应，所述注册响应包括所述终端允许接入的网络切片的S-NSSAI；根据所述终端请求切换的PDN连接切换到5G网络时对应的S-NSSAI以及所述允许接入的网络切片的S-NSSAI，确定所述能够切换到5G网络中的PDN连接。
可选的，所述PCO消息中还包括所述第一PDN连接切换到5G网络时对应的DNN，所述PDU会话建立请求中还包括所述第一PDN连接对应的接入点名称APN。
其中，上述方法实施例涉及的各步骤的所有相关内容均可以援引到对应功能模块的功能描述，在此不再赘述。
在本实施例中，该装置500以采用集成的方式划分各个功能模块的形式来呈现。这里的“模块”可以指特定应用集成电路(application-specific integrated circuit，ASIC)，电路，执行一个或多个软件或固件程序的处理器和存储器，集成逻辑电路，和/或其他可以提供上述功能的器件。在一个简单的实施例中，本领域的技术人员可以想到装置500可以采用图2所示的形式。
比如，图2中的处理器201可以通过调用存储器203中存储的计算机执行指令，使得装置500执行上述方法实施例中的会话建立方法。
具体的，图5中的接收模块501、发送模块502以及确定模块503的功能/实现过程可以通过图2中的处理器201调用存储器203中存储的计算机执行指令来实现。
可选的，当该装置500是芯片时，则接收模块501、发送模块502以及确定模块503的功能/实现过程还可以通过管脚或电路等来实现。可选地，当该装置500是芯片时，存储器203可以为芯片内的存储单元，如寄存器、缓存等。当然，当该装置500是终端时，存储器203可以是终端内的位于芯片外部的存储单元，本申请实施例对此不作具体限定。
由于本申请实施例提供的装置可用于执行上述会话建立方法，因此其所能获得的技术效果可参考上述方法实施例，在此不再赘述。
图6示出了一种控制面功能实体600的结构示意图。该控制面功能实体600包括：发送模块601和接收模块602；发送模块601，用于发送已建立的分组数据网络PDN连接切换到5G网络时对应的网络切片信息；所述已建立的PDN连接切换到5G网络时对应的网络切片信息包括所述已建立的PDN连接对应的网络切片的单网络切片选择辅助信息S-NSSAI；所述接收模块602，用于接收分组数据单元PDU会话建立请求，其中，所述PDU会话建立请求包括第一PDN连接对应的网络切片的S-NSSAI以及所述第一PDN连接切换到5G网络时对应的数据网络名称DNN；所述第一PDN连接为所述已建立的PDN连接中的任意一个PDN连接。
可选的，所述已建立的分组数据网络PDN连接切换到5G网络时对应的网络切片信息携带在协议配置项PCO消息中。其中，所述PCO消息中还包括所述已建立的PDN连接切换到5G网络时对应的DNN。
可选的，所述控制面功能实体还包括：确定模块；所述确定模块，用于根据所述已建立的PDN连接对应的接入点名称APN，确定所述已建立的PDN连接切换到5G网络时对应的网络切片信息。
一种可能的实现方式是，所述发送模块502，还用于发送指示信息，所述指示信息用于指示所述控制面功能实体发送的网络切片信息为归属地网络切片信息。
在所述已建立的PDN是在归属地路由场景下建立的情况下，所述发送模块502，具体用于：确定所述已建立的PDN连接切换到5G时对应的归属地的网络切片信息；将所述已建立的PDN连接切换到5G时对应的归属地的网络切片信息映射为拜访地的网络切片信息；将所述已建立的PDN连接切换到5G时对应的拜访地的网络切片信息作为所述已建立的PDN连接切换到5G时对应的切片信息发送给终端。
可选的，所述已建立的PDN连接切换到5G网络时对应的网络切片信息还包括所述已建立的PDN连接切换到5G网络时对应的网络切片实例的标识NSI-ID。
一种可能的实现方式中，所述接收模块602，还用于接收来自所述终端的能力指示，所述能力指示用于指示所述终端能够切换至5G网络中。
其中，上述方法实施例涉及的各步骤的所有相关内容均可以援引到对应功能模块的功能描述，在此不再赘述。
其中，上述控制面功能实体600可以实现在集成电路、无线射频集成电路、印刷电路板等上。同时该装置可以是自立设备，也可以是较大设备的一部分。在本实施例中，该控制面功能实体600以采用集成的方式划分各个功能模块的形式来呈现。这里的“模块”可以指特定ASIC，电路，执行一个或多个软件或固件程序的处理器和存储器，集成逻辑电路，和/或其他可以提供上述功能的器件。
在一个简单的实施例中，本领域的技术人员可以想到控制面功能实体600可以采用图2所示的形式。比如，图2中的处理器201可以通过调用存储器203中存储的计算机执行指令，使得控制面功能实体600执行上述方法实施例中的会话建立方法。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件程序实现时，可以全部或部分地以计算机程序产品的形式来实现。该计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行计算机程序指令时，全部或部分地产生按照本申请实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或者数据中心通过有线(例如同轴电缆、光纤、数字用户线(digital subscriber line，DSL))或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可以用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质(例如，软盘、硬盘、磁带)，光介质(例如，DVD)、或者半导体介质(例如固态硬盘(solid state disk，SSD))等。
尽管在此结合各实施例对本申请进行了描述，然而，在实施所要求保护的本申请过程中， 本领域技术人员通过查看所述附图、公开内容、以及所附权利要求书，可理解并实现所述公开实施例的其他变化。在权利要求中，“包括”(comprising)一词不排除其他组成部分或步骤，“一”或“一个”不排除多个的情况。单个处理器或其他单元可以实现权利要求中列举的若干项功能。相互不同的从属权利要求中记载了某些措施，但这并不表示这些措施不能组合起来产生良好的效果。
尽管结合具体特征及其实施例对本申请进行了描述，显而易见的，在不脱离本申请的精神和范围的情况下，可对其进行各种修改和组合。相应地，本说明书和附图仅仅是所附权利要求所界定的本申请的示例性说明，且视为已覆盖本申请范围内的任意和所有修改、变化、组合或等同物。显然，本领域的技术人员可以对本申请进行各种改动和变型而不脱离本申请的精神和范围。这样，倘若本申请的这些修改和变型属于本申请权利要求及其等同技术的范围之内，则本申请也意图包含这些改动和变型在内。

Claims (48)

  1. 一种会话建立方法，其特征在于，所述方法包括：
    终端接收来自控制面功能实体的已建立的分组数据网络PDN连接切换到5G网络时对应的网络切片信息；所述已建立的PDN连接切换到5G网络时对应的网络切片信息包括所述已建立的PDN连接切换到5G网络时对应的网络切片的单网络切片选择辅助信息S-NSSAI；
    所述终端发送分组数据单元PDU会话建立请求，其中，所述PDU会话建立请求包括第一PDN连接切换到5G网络时对应的网络切片的S-NSSAI；所述第一PDN连接为所述已建立的PDN连接中的任意一个PDN连接。
  2. 根据权利要求1所述的方法，其特征在于，所述PDU会话建立请求还包括所述第一PDN连接切换到5G网络时对应的数据网络名称DNN。
  3. 根据权利要求1或2所述的方法，其特征在于，所述已建立的分组数据网络PDN连接切换到5G网络时对应的网络切片信息携带在协议配置项PCO消息中。
  4. 根据权利要求1-3任一所述的方法，其特征在于，所述终端还接收来自所述控制面功能实体的指示信息，所述指示信息用于指示从所述控制面功能实体接收到的网络切片信息为归属地网络切片信息。
  5. 根据权利要求4所述的方法，其特征在于，所述方法还包括：
    根据归属地网络切片的S-NSSAI与拜访地的网络切片的S-NSSAI的对应关系，将请求切换的PDN连接切换到5G时对应的归属地网络切片的S-NSSAI映射为请求切换的PDN连接切换到5G时对应的拜访地网络切片的S-NSSAI。
  6. 根据权利要求1-5任一所述的方法，其特征在于，所述已建立的PDN连接切换到5G网络时对应的网络切片信息还包括所述已建立的PDN连接切换到5G网络时对应的网络切片实例的标识NSI-ID。
  7. 根据权利要求1-6任一所述的方法，其特征在于，在所述终端接收来自控制面功能实体的已建立的分组数据网络PDN连接切换到5G网络时对应的网络切片信息之前，所述方法还包括：
    所述终端向所述控制面功能实体发送能力指示，所述能力指示用于指示所述终端能够切换至5G网络中。
  8. 根据权利要求1-7任一所述的方法，其特征在于，在所述发送分组数据单元PDU会话建立请求之前，所述方法还包括：
    所述终端确定所述已建立的PDN连接中能够切换到5G网络中的PDN连接，所述第一PDN连接为所述能够切换到5G的PDN连接中的任意一个PDN连接。
  9. 根据权利要8所述的方法，其特征在于，所述所述终端确定所述已建立的PDN连接中能够切换到5G网络中的PDN连接，具体包括：
    所述终端发送注册请求，所述注册请求包括终端请求切换的PDN连接切换到5G网络时对应的网络切片信息，其中，所述终端请求切换的PDN连接为所述已建立的PDN连接中的一部分或者全部PDN连接；
    接收注册响应，所述注册响应包括所述终端允许接入的网络切片的S-NSSAI；
    根据所述终端请求切换的PDN连接切换到5G网络时对应的S-NSSAI以及所述允许接入的网络切片的S-NSSAI，确定所述能够切换到5G网络中的PDN连接。
  10. 根据权利要求3-9任一所述的方法，其特征在于，所述PCO消息中还包括所述第一PDN连接切换到5G网络时对应的DNN，所述PDU会话建立请求中还包括所述第一PDN连接对应的接入点名称APN。
  11. 一种会话建立方法，其特征在于，所述方法包括：
    控制面功能实体向终端发送所述终端已建立的分组数据网络PDN连接切换到5G网络时对应的网络切片信息；所述已建立的PDN连接切换到5G网络时对应的网络切片信息包括所述已建立的PDN连接对应的网络切片的单网络切片选择辅助信息S-NSSAI；
    所述控制面功能实体接收分组数据单元PDU会话建立请求，其中，所述PDU会话建立请求包括第一PDN连接对应的网络切片的S-NSSAI；所述第一PDN连接为所述已建立的PDN连接中的任意一个PDN连接。
  12. 根据权利要求11所述的方法，其特征在于，所述PDU会话建立请求还包括所述第一PDN连接切换到5G网络时对应的数据网络名称DNN。
  13. 根据权利要求11或12所述的方法，其特征在于，所述已建立的分组数据网络PDN连接切换到5G网络时对应的网络切片信息携带在协议配置项PCO消息中。
  14. 根据权利要求11-13任一所述的方法，其特征在于，所述方法还包括：所述控制面功能实体根据所述已建立的PDN连接对应的接入点名称APN，确定所述已建立的PDN连接切换到5G网络时对应的网络切片信息。
  15. 根据权利要求11-14任一所述的方法，其特征在于，所述控制面功能实体还发送指示信息，所述指示信息用于指示所述控制面功能实体发送的网络切片信息为归属地网络切片信息。
  16. 根据权利要求11-14任一所述的方法，其特征在于，在所述已建立的PDN是在归属地路由场景下建立的情况下，所述控制面功能实体发送已建立的分组数据网络PDN连接切换到5G网络时对应的网络切片信息，具体包括：
    所述控制面功能实体确定所述已建立的PDN连接切换到5G时对应的归属地的网络切片信息；
    将所述已建立的PDN连接切换到5G时对应的归属地的网络切片信息映射为拜访地的网络切片信息；
    将所述已建立的PDN连接切换到5G时对应的拜访地的网络切片信息作为所述已建立的PDN连接切换到5G时对应的切片信息发送给所述终端。
  17. 根据权利要求11-16任一所述的方法，其特征在于，所述已建立的PDN连接切换到5G网络时对应的网络切片信息还包括所述已建立的PDN连接切换到5G网络时对应的网络切片实例的标识NSI-ID。
  18. 根据权利要求11-17任一所述的方法，其特征在于，在所述控制面功能实体向终端发送已建立的分组数据网络PDN连接切换到5G网络时对应的网络切片信息之前，所述方法包括：
    所述控制面功能实体接收来自所述终端的能力指示，所述能力指示用于指示所述终端能够切换至5G网络中。
  19. 根据权利要求13-18任一所述的方法，其特征在于，
    所述PCO消息中还包括所述已建立的PDN连接切换到5G网络时对应的DNN。
  20. 一种终端，其特征在于，所述终端包括：接收模块和发送模块；
    所述接收模块，用于接收来自控制面功能实体的已建立的分组数据网络PDN连接切换到5G网络时对应的网络切片信息；所述已建立的PDN连接切换到5G网络时对应的网络切片信息包括所述已建立的PDN连接切换到5G网络时对应的网络切片的单网络切片选择辅助信息S-NSSAI；
    所述发送模块，用于发送分组数据单元PDU会话建立请求，其中，所述PDU会话建立请求包括第一PDN连接切换到5G网络时对应的网络切片的S-NSSAI；所述第一PDN连接为所述已建立的PDN连接中的任意一个PDN连接。
  21. 根据权利要求20所述的终端，其特征在于，所述PDU会话建立请求还包括所述第一PDN连接切换到5G网络时对应的数据网络名称DNN。
  22. 根据权利要求20或21所述的终端，其特征在于，所述已建立的分组数据网络PDN连接切换到5G网络时对应的网络切片信息携带在协议配置项PCO消息中。
  23. 根据权利要求20-22任一所述的终端，其特征在于，所述接收模块，还用于接收来自所述控制面功能实体的指示信息，所述指示信息用于指示从所述控制面功能实体接收到的网络切片信息为归属地网络切片信息。
  24. 根据权利要求23所述的终端，其特征在于，所述终端还包括：映射模块；
    所述映射模块，用于根据归属地网络切片的S-NSSAI与拜访地的网络切片的S-NSSAI的对应关系，将请求切换的PDN连接切换到5G时对应的归属地网络切片的S-NSSAI映射为请求切换的PDN连接切换到5G时对应的拜访地网络切片的S-NSSAI。
  25. 根据权利要求20-24任一所述的终端，其特征在于，所述已建立的PDN连接切换到5G网络时对应的网络切片信息还包括所述已建立的PDN连接切换到5G网络时对应的网络切片实例的标识NSI-ID。
  26. 根据权利要求20-25任一所述的终端，其特征在于，所述发送模块，还用于向所述控制面功能实体发送能力指示，所述能力指示用于指示所述终端能够切换至5G网络中。
  27. 根据权利要求20-26任一所述的终端，其特征在于，所述终端还包括确定模块，所述确定模块，用于确定所述已建立的PDN连接中能够切换到5G网络中的PDN连接，所述第一PDN连接为所述能够切换到5G的PDN连接中的任意一个PDN连接。
  28. 根据权利要求27所述的终端，其特征在于，所述确定模块，具体用于：
    发送注册请求，所述注册请求包括终端请求切换的PDN连接切换到5G网络时对应的网络切片信息，其中，所述终端请求切换的PDN连接为所述已建立的PDN连接中的一部分或者全部PDN连接；
    接收注册响应，所述注册响应包括所述终端允许接入的网络切片的S-NSSAI；
    根据所述终端请求切换的PDN连接切换到5G网络时对应的S-NSSAI以及所述允许接入的网络切片的S-NSSAI，确定所述能够切换到5G网络中的PDN连接。
  29. 根据权利要求20-28任一所述的终端，其特征在于，所述PCO消息中还包括所述第一PDN连接切换到5G网络时对应的DNN，所述PDU会话建立请求中还包括所述第一PDN连接对应的接入点名称APN。
  30. 一种控制面功能实体，其特征在于，包括发送模块和接收模块，其中，
    所述发送模块，用于向终端发送所述终端已建立的分组数据网络PDN连接切换到5G网络时对应的网络切片信息；所述已建立的PDN连接切换到5G网络时对应的网络切片信息包括所述已建立的PDN连接对应的网络切片的单网络切片选择辅助信息S-NSSAI；
    所述接收模块，用于接收分组数据单元PDU会话建立请求，其中，所述PDU会话建立请求包括第一PDN连接对应的网络切片的S-NSSAI；所述第一PDN连接为所述已建立的PDN连接中的任意一个PDN连接。
  31. 根据权利要求30所述的控制面功能实体，其特征在于，所述PDU会话建立请求还包括所述第一PDN连接切换到5G网络时对应的数据网络名称DNN。
  32. 根据权利要求30或31所述的控制面功能实体，其特征在于，所述已建立的分组数据网络PDN连接切换到5G网络时对应的网络切片信息携带在协议配置项PCO消息中。
  33. 根据权利要求30-32任一所述的控制面功能实体，其特征在于，所述控制面功能实体还包括：确定模块；
    所述确定模块，用于根据所述已建立的PDN连接对应的接入点名称APN，确定所述已建立的PDN连接切换到5G网络时对应的网络切片信息。
  34. 根据权利要求30-33任一所述的控制面功能实体，其特征在于，所述发送模块，还用于发送指示信息，所述指示信息用于指示所述控制面功能实体发送的网络切片信息为归属地网络切片信息。
  35. 根据权利要求30-33任一所述的控制面功能实体，其特征在于，在所述已建立的PDN是在归属地路由场景下建立的情况下，所述发送模块，具体用于：
    确定所述已建立的PDN连接切换到5G时对应的归属地的网络切片信息；
    将所述已建立的PDN连接切换到5G时对应的归属地的网络切片信息映射为拜访地的网络切片信息；
    将所述已建立的PDN连接切换到5G时对应的拜访地的网络切片信息作为所述已建立的PDN连接切换到5G时对应的切片信息发送给终端。
  36. 根据权利要求30-35任一所述的控制面功能实体，其特征在于，所述已建立的PDN连接切换到5G网络时对应的网络切片信息还包括所述已建立的PDN连接切换到5G网络时对应的网络切片实例的标识NSI-ID。
  37. 根据权利要求30-36任一所述的控制面功能实体，其特征在于，所述接收模块，还用于接收来自所述终端的能力指示，所述能力指示用于指示所述终端能够切换至5G网络中。
  38. 根据权利要求30-37任一所述的控制面功能实体，其特征在于，
    所述PCO消息中还包括所述已建立的PDN连接切换到5G网络时对应的DNN。
  39. 一种装置，其特征在于，所述装置包括处理器和存储器；
    所述存储器用于存储计算机执行指令，当所述装置运行时，所述处理器执行所述存储器存储的所述计算机执行指令，以使所述装置执行如权利要求1-10中任意一项所述的会话建立方法。
  40. 根据权利要求39所述的装置，其特征在于，所述装置包括终端或所述终端内的芯片。
  41. 一种控制面功能实体，其特征在于，所述控制面功能实体包括处理器和存储器；
    所述存储器用于存储计算机执行指令，当所述会话管理实体运行时，所述处理器执行所述存储器存储的所述计算机执行指令，以使所述会话管理实体执行如权利要求11-19中任意一项所述的会话建立的方法。
  42. 一种计算机存储介质，所述计算机可读存储介质中存储有指令，当其在计算机上运行时，使得计算机执行所述权利要求1-10中任意一项所述的方法。
  43. 一种计算机存储介质，所述计算机可读存储介质中存储有指令，当其在计算机上运行时，使得计算机执行所述权利要求11-19中任意一项所述的方法。
  44. 一种会话建立方法，其特征在于，所述方法包括：
    终端接收来自控制面功能实体的已建立的分组数据网络PDN连接切换到5G网络时对应的网络切片信息；所述已建立的PDN连接切换到5G网络时对应的网络切片信息包括所述已建立的PDN连接切换到5G网络时对应的网络切片的单网络切片选择辅助信息S-NSSAI；
    当所述终端移动到5G网络覆盖范围时，所述终端向接入设备发送注册请求，所述注册请求包括终端请求切换的PDN连接切换到5G时对应的网络切片信息；其中，所述终端请求切换的PDN连接为所述已建立的PDN连接中的一部分或者全部PDN连接。
  45. 一种终端，其特征在于，所述终端包括：接收模块和发送模块；
    所述接收模块，用于接收来自控制面功能实体的已建立的分组数据网络PDN连接切换到5G网络时对应的网络切片信息；所述已建立的PDN连接切换到5G网络时对应的网 络切片信息包括所述已建立的PDN连接切换到5G网络时对应的网络切片的单网络切片选择辅助信息S-NSSAI；
    所述发送模块，用于当所述终端移动到5G网络覆盖范围时，向接入设备发送注册请求，所述注册请求包括终端请求切换的PDN连接切换到5G时对应的网络切片信息；其中，所述终端请求切换的PDN连接为所述已建立的PDN连接中的一部分或者全部PDN连接。
  46. 一种计算机存储介质，所述计算机可读存储介质中存储有指令，当其在计算机上运行时，使得计算机执行所述权利要求44所述的方法。
  47. 一种装置，其特征在于，所述装置包括处理器和存储器；
    所述存储器用于存储计算机执行指令，当所述装置运行时，所述处理器执行所述存储器存储的所述计算机执行指令，以使所述装置执行如权利要求44所述的会话建立方法。
  48. 根据权利要求47所述的装置，其特征在于，所述装置包括终端或所述终端内的芯片。
PCT/CN2018/116064 2017-11-17 2018-11-17 会话建立方法和装置 Ceased WO2019096286A1 (zh)

Priority Applications (14)

Application Number Priority Date Filing Date Title
AU2018366776A AU2018366776B2 (en) 2017-11-17 2018-11-17 Session establishing method and device
EP21162574.4A EP3902326B1 (en) 2017-11-17 2018-11-17 Session establishment method and apparatus
EP18878075.3A EP3557906B1 (en) 2017-11-17 2018-11-17 Session establishing method and device
CN201880074532.6A CN111684834B (zh) 2017-11-17 2018-11-17 会话建立方法和装置
BR112020009803-5A BR112020009803A2 (pt) 2017-11-17 2018-11-17 Método de estabelecimento de sessão, aparelho, entidade de função de plano de controle, mídia de armazenamento legível por computador, e produto de programa decomputador
RU2020119392A RU2776778C2 (ru) 2017-11-17 2018-11-17 Способ и оборудование установления сеанса
KR1020227000102A KR102475693B1 (ko) 2017-11-17 2018-11-17 세션 확립 방법 및 장치
KR1020207017559A KR102348103B1 (ko) 2017-11-17 2018-11-17 세션 확립 방법 및 장치
CN202511157262.3A CN121218275A (zh) 2017-11-17 2018-11-17 会话建立方法和装置
EP23180019.4A EP4297499A3 (en) 2017-11-17 2018-11-17 Session establishment method and apparatus
JP2020526870A JP7046180B2 (ja) 2017-11-17 2018-11-17 セッション確立方法及び機器
US16/427,990 US10834209B2 (en) 2017-11-17 2019-05-31 Session establishment method and apparatus
US17/074,897 US11533375B2 (en) 2017-11-17 2020-10-20 Session establishment method and apparatus
US18/075,981 US11870856B2 (en) 2017-11-17 2022-12-06 Session establishment method and apparatus

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN201711148057.6 2017-11-17
CN201711148057 2017-11-17
CN201810037192.1 2018-01-15
CN201810037192.1A CN109803336B (zh) 2017-11-17 2018-01-15 会话建立方法和装置

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US16/427,990 Continuation US10834209B2 (en) 2017-11-17 2019-05-31 Session establishment method and apparatus

Publications (1)

Publication Number Publication Date
WO2019096286A1 true WO2019096286A1 (zh) 2019-05-23

Family

ID=66556185

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2018/116064 Ceased WO2019096286A1 (zh) 2017-11-17 2018-11-17 会话建立方法和装置

Country Status (8)

Country Link
US (3) US10834209B2 (zh)
EP (3) EP3557906B1 (zh)
JP (1) JP7046180B2 (zh)
KR (2) KR102348103B1 (zh)
CN (5) CN112512089B (zh)
AU (1) AU2018366776B2 (zh)
BR (1) BR112020009803A2 (zh)
WO (1) WO2019096286A1 (zh)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021104465A1 (en) * 2019-11-29 2021-06-03 Telefonaktiebolaget Lm Ericsson (Publ) Method and apparatus for pdn connection management
WO2022021088A1 (en) * 2020-07-28 2022-02-03 Qualcomm Incorporated Restriction on single network slice selection assistance information in ue route selection policy
KR20220046617A (ko) * 2019-08-08 2022-04-14 텔레폰악티에볼라겟엘엠에릭슨(펍) 5gs 상호 연동 처리를 위한 방법 및 장치
US20220407743A1 (en) * 2019-11-22 2022-12-22 Sony Group Corporation Control device and control method

Families Citing this family (41)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112512089B (zh) * 2017-11-17 2021-11-19 华为技术有限公司 会话建立方法、装置和介质
US10999447B2 (en) * 2018-11-02 2021-05-04 Ofinno, Llc Charging control in roaming scenario
US10785688B2 (en) * 2018-12-05 2020-09-22 Syniverse Technologies, Llc Methods and systems for routing mobile data traffic in 5G networks
US11122416B2 (en) 2019-01-22 2021-09-14 Samsung Electronics Co., Ltd. Device and method for providing network slice interworking in wireless communication system
KR102686161B1 (ko) * 2019-05-03 2024-07-18 삼성전자 주식회사 이동통신 시스템에서 시간 또는 서비스 지역에 따른 단말의 세션 설정 관리 방법 및 장치
KR102917797B1 (ko) * 2019-05-07 2026-01-23 삼성전자주식회사 무선 통신 시스템에서 세션 연속성을 제공하기 위한 방법 및 장치
WO2020250004A1 (en) * 2019-06-10 2020-12-17 Nokia Technologies Oy Method and apparatus for enforcement of maximum number of protocol data unit sessions per network slice in a communication system
US11540181B2 (en) * 2019-06-16 2022-12-27 Qualcomm Incorporated Handling of network slice information for roaming user equipment (UE)
CN110266594B (zh) * 2019-06-28 2021-07-30 Ut斯达康通讯有限公司 跨网络切片的分段路由转发方法及装置
CN112584458B (zh) * 2019-09-30 2023-01-06 华为技术有限公司 数据传输方法及装置
EP4035454B1 (en) 2019-11-02 2025-03-26 Samsung Electronics Co., Ltd. Method and system for network slice authentication and authorization
WO2021123892A1 (en) * 2019-12-19 2021-06-24 Telefonaktiebolaget Lm Ericsson (Publ) Slice and/or subscriber identification module device lock
KR20210088268A (ko) * 2020-01-06 2021-07-14 삼성전자주식회사 무선 통신 시스템에서 네트워크 슬라이스 데이터 속도를 제어하기 위한 장치 및 방법
CN113163468A (zh) * 2020-01-22 2021-07-23 中国电信股份有限公司 网络切片的接入方法、系统和终端
US11026149B1 (en) * 2020-01-31 2021-06-01 Dish Wireless Llc Systems and methods for reducing slice access failures
US20230164652A1 (en) * 2020-02-13 2023-05-25 Telefonaktiebolaget Lm Ericsson (Publ) Re-selection of a pgw-c/smf in the desired network slice
WO2021180340A1 (en) * 2020-03-11 2021-09-16 Telefonaktiebolaget Lm Ericsson (Publ) Transition control between radio resource control states
CN113543232B (zh) * 2020-04-21 2024-11-08 中国移动通信有限公司研究院 一种数据传输方法、终端、用户面功能实体及服务器
CN111698290B (zh) * 2020-05-19 2021-06-15 展讯通信(天津)有限公司 Pdu会话复用方法、装置、用户设备及存储介质
CN113766581B (zh) * 2020-06-03 2024-12-24 华为技术有限公司 通信方法以及相关联的通信装置、介质和芯片
KR20220015104A (ko) * 2020-07-30 2022-02-08 삼성전자주식회사 네트워크 슬라이스의 동시 사용 방법 및 장치
KR20220020671A (ko) 2020-08-12 2022-02-21 삼성전자주식회사 Uas 통신을 위한 라우팅 정보 관리 및 세션 제어 방법
CN112333764B (zh) * 2020-11-06 2023-09-19 中国联合网络通信集团有限公司 网络切片的选择方法及装置、切片映射系统、网络设备
CN113068227B (zh) * 2020-11-24 2023-10-27 锐捷网络股份有限公司 一种在5g网络中切换切片的方法和基站
CN113115473B (zh) * 2021-03-01 2022-09-30 深圳艾灵网络有限公司 网络切片控制方法及装置、服务器、系统及存储介质
CN116806436A (zh) * 2021-03-11 2023-09-26 华为技术有限公司 移动边缘计算应用的移动网络运营商之间的协作
CN119402851A (zh) * 2021-04-02 2025-02-07 华为技术有限公司 一种网络接入方法及装置
US20220361080A1 (en) * 2021-05-06 2022-11-10 Apple Inc. UE Provision of Slice Information for Improved Network Slice Selection During Inter RAT Transfers
CN113423078B (zh) * 2021-06-03 2022-08-09 中国联合网络通信集团有限公司 应用程序网络分片选择方法、应用服务器及pcf
CN115515125B (zh) * 2021-06-22 2024-12-03 中国电信股份有限公司 切片接入的控制方法、装置和系统
WO2023277469A1 (en) * 2021-06-29 2023-01-05 Samsung Electronics Co., Ltd. Method and apparatus for handling registration of user equipment to network slice
WO2023003310A1 (en) * 2021-07-23 2023-01-26 Samsung Electronics Co., Ltd. Method and apparatus for selecting frequency band for ue in a wireless network
EP4420415A4 (en) * 2021-10-20 2025-08-27 Lg Electronics Inc METHOD AND APPARATUS FOR SLICE-SENSITIVE CELL PROHIBITING IN A WIRELESS COMMUNICATION SYSTEM
CN114125809B (zh) * 2021-10-28 2024-11-29 展讯通信（上海）有限公司 切片服务获取方法及相关装置
CN116074903A (zh) * 2021-11-02 2023-05-05 中兴通讯股份有限公司 会话建立方法、设备和存储介质
CN114095986B (zh) * 2021-11-03 2024-02-13 中国联合网络通信集团有限公司 一种通信方法、装置、设备及存储介质
US12075258B2 (en) * 2021-11-30 2024-08-27 Verizon Patent And Licensing Inc. Method and system for inter-radio access technology packet data network connection management
CN114222341B (zh) * 2021-12-21 2023-08-01 中国联合网络通信集团有限公司 会话接续方法和会话管理功能实体
US20250048242A1 (en) * 2022-01-11 2025-02-06 Samsung Electronics Co., Ltd. Enforcing network slice simultaneous registration group (nssrg) in evolved packet system (eps) in a wireless communication system
CN116567761B (zh) * 2022-01-30 2025-12-05 华为技术有限公司 通信方法及装置
EP4351188A4 (en) 2022-08-19 2024-09-11 Internet Initiative Japan Inc. Method, information processing device, and system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106851589A (zh) * 2016-12-30 2017-06-13 北京小米移动软件有限公司 无线网络接入方法、装置及系统
US20170303259A1 (en) * 2016-04-18 2017-10-19 Electronics And Telecommunications Research Institute Communication method and apparatus using network slicing

Family Cites Families (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8576795B2 (en) 2007-03-16 2013-11-05 Qualcomm Incorporated Method and apparatus for handoff between source and target access systems
CN101730142B (zh) * 2009-06-30 2012-09-05 中兴通讯股份有限公司 多分组数据网络连接的建立方法以及装置
KR101773158B1 (ko) * 2013-07-25 2017-08-30 후아웨이 테크놀러지 컴퍼니 리미티드 이동 네트워크를 동적으로 전환하는 방법, 가입 관리기, 및 사용자 장비
US10506489B2 (en) * 2015-09-18 2019-12-10 Huawei Technologies Co., Ltd. System and methods for network slice reselection
US10897507B2 (en) * 2016-04-01 2021-01-19 Qualcomm Incorporated Mechanism to enable connectivity sessions and IP session establishment
KR20170119296A (ko) * 2016-04-18 2017-10-26 한국전자통신연구원 네트워크 슬라이싱을 이용한 통신 방법 및 장치
EP3840464A1 (en) * 2016-05-12 2021-06-23 Convida Wireless, LLC Connecting to virtualized mobile core networks
CN106060900B (zh) * 2016-05-13 2019-12-10 宇龙计算机通信科技(深圳)有限公司 网络切片的接入控制方法及装置、终端化小区和sdn控制器
WO2018008980A1 (ko) * 2016-07-05 2018-01-11 엘지전자(주) 무선 통신 시스템에서 사용자가 선호하는 자원 운용 선택 방법 및 이를 위한 장치
US10743250B2 (en) * 2016-08-16 2020-08-11 Idac Holdings, Inc. Network slice reselection
JP2019534653A (ja) * 2016-11-18 2019-11-28 エルジー エレクトロニクス インコーポレイティド 無線通信システムにおけるネットワークノード選択方法及びその装置
US11160007B2 (en) * 2017-01-06 2021-10-26 Lg Electronics Inc. Method and terminal for carrying out access control in 5th generation mobile communication system
WO2018134483A1 (en) * 2017-01-23 2018-07-26 Nokia Technologies Oy Method and apparatus for complementary and equivalent network slice deployment in a network environment
CN106982458B (zh) * 2017-03-09 2019-12-17 华为技术有限公司 一种网络切片的选择方法及装置
US11202330B2 (en) * 2017-06-17 2021-12-14 Lg Electronics Inc. Method for registering terminal in wireless communication system and apparatus therefor
EP3641423B1 (en) * 2017-06-17 2022-04-20 LG Electronics Inc. Method for registering terminal in wireless communication system and apparatus therefor
US10462644B2 (en) * 2017-06-21 2019-10-29 Telefonaktiebolaget Lm Ericsson (Publ) Mapping of S-NSSAI at roaming
US11128673B2 (en) * 2017-08-04 2021-09-21 Blackberry Limited Method and system for access and use of multiple ISIM or ISIM credentials
EP3666032B1 (en) * 2017-08-11 2026-02-11 InterDigital Patent Holdings, Inc. Traffic steering and switching between multiple access networks
US11026128B2 (en) * 2017-10-19 2021-06-01 Qualcomm Incorporated Mechanism to enable interworking between network slicing and evolved packet core connectivity
CA3021658A1 (en) * 2017-10-20 2019-04-20 Comcast Cable Communications, Llc Non-access stratum capability information
US10660016B2 (en) * 2017-11-08 2020-05-19 Ofinno, Llc Location based coexistence rules for network slices in a telecommunication network
CN112512089B (zh) * 2017-11-17 2021-11-19 华为技术有限公司 会话建立方法、装置和介质
US10986602B2 (en) * 2018-02-09 2021-04-20 Intel Corporation Technologies to authorize user equipment use of local area data network features and control the size of local area data network information in access and mobility management function
US10986622B2 (en) * 2018-05-10 2021-04-20 Apple Inc. User equipment (UE) downlink transmission configuration indication (TCI)-state selection
EP3811545B1 (en) * 2018-09-13 2023-08-02 Apple Inc. Hybrid automatic repeat request feedback for wireless communication

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170303259A1 (en) * 2016-04-18 2017-10-19 Electronics And Telecommunications Research Institute Communication method and apparatus using network slicing
CN106851589A (zh) * 2016-12-30 2017-06-13 北京小米移动软件有限公司 无线网络接入方法、装置及系统

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
ERICSSON: "Mobility procedures for Slicing", 3GPP TSG-RAN WG3 MEETING #97, no. R3-173933, 13 October 2017 (2017-10-13), XP051356430 *
HUAWEI: "Clarification on Allowed NSSAI", 3GPP TSG-RAN WG3 #97BIS MEETING , no. R3-173898, 13 October 2017 (2017-10-13), XP051356368 *
HUAWEI; HISILICON: "What is RAN part of a network slice?", 3GPP TSG-RAN WG2 #99BIS , no. R2-1710222, 13 October 2017 (2017-10-13), XP051354792 *
See also references of EP3557906A4

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20220046617A (ko) * 2019-08-08 2022-04-14 텔레폰악티에볼라겟엘엠에릭슨(펍) 5gs 상호 연동 처리를 위한 방법 및 장치
JP2022543356A (ja) * 2019-08-08 2022-10-12 テレフオンアクチーボラゲット エルエム エリクソン（パブル） ５ｇｓのインターワーキングのためのハンドリングおよび装置
JP7374294B2 (ja) 2019-08-08 2023-11-06 テレフオンアクチーボラゲット エルエム エリクソン（パブル） ５ｇｓのインターワーキングのためのハンドリングおよび装置
JP2024001253A (ja) * 2019-08-08 2024-01-09 テレフオンアクチーボラゲット エルエム エリクソン（パブル） ５ｇｓのインターワーキングのためのハンドリングおよび装置
JP7569435B2 (ja) 2019-08-08 2024-10-17 テレフオンアクチーボラゲット エルエム エリクソン（パブル） ５ｇｓのインターワーキングのためのハンドリングおよび装置
KR102785649B1 (ko) * 2019-08-08 2025-03-21 텔레폰악티에볼라겟엘엠에릭슨(펍) 5gs 상호 연동 처리를 위한 방법 및 장치
US20220407743A1 (en) * 2019-11-22 2022-12-22 Sony Group Corporation Control device and control method
US11824686B2 (en) * 2019-11-22 2023-11-21 Sony Group Corporation Control device and control method
WO2021104465A1 (en) * 2019-11-29 2021-06-03 Telefonaktiebolaget Lm Ericsson (Publ) Method and apparatus for pdn connection management
WO2022021088A1 (en) * 2020-07-28 2022-02-03 Qualcomm Incorporated Restriction on single network slice selection assistance information in ue route selection policy

Also Published As

Publication number Publication date
KR20200087838A (ko) 2020-07-21
US11533375B2 (en) 2022-12-20
JP7046180B2 (ja) 2022-04-01
EP3557906A1 (en) 2019-10-23
US20230179664A1 (en) 2023-06-08
BR112020009803A8 (pt) 2020-11-10
CN121218275A (zh) 2025-12-26
US11870856B2 (en) 2024-01-09
CN109951884A (zh) 2019-06-28
EP3902326C0 (en) 2023-07-12
CN109803336B (zh) 2024-04-12
CN111684834A (zh) 2020-09-18
CN112512089A (zh) 2021-03-16
EP3557906A4 (en) 2020-01-08
AU2018366776A1 (en) 2020-06-11
US20190297148A1 (en) 2019-09-26
RU2020119392A (ru) 2021-12-17
RU2020119392A3 (zh) 2021-12-17
EP3902326A1 (en) 2021-10-27
CN112512089B (zh) 2021-11-19
US20210105328A1 (en) 2021-04-08
CN109803336A (zh) 2019-05-24
JP2021503783A (ja) 2021-02-12
EP3902326B1 (en) 2023-07-12
KR102475693B1 (ko) 2022-12-07
CN111684834B (zh) 2025-08-29
US10834209B2 (en) 2020-11-10
CN109951884B (zh) 2020-06-16
EP4297499A3 (en) 2024-01-17
AU2018366776B2 (en) 2021-07-01
KR20220003677A (ko) 2022-01-10
BR112020009803A2 (pt) 2020-11-10
KR102348103B1 (ko) 2022-01-05
EP4297499A2 (en) 2023-12-27
EP3557906B1 (en) 2021-04-14

Similar Documents

Publication Publication Date Title
US11870856B2 (en) Session establishment method and apparatus
US12108289B2 (en) Session establishment method and system, and device
CN110166407B (zh) QoS流处理方法、设备及系统
CN110049072B (zh) 会话建立方法及设备
CN109819488B (zh) 一种会话切换方法、设备及系统
CN110035423A (zh) 会话管理方法、设备及系统
CN110446233A (zh) 切换方法、设备及系统
US11160004B2 (en) Handover method, device, and system
WO2020200122A1 (zh) 一种通信方法及装置
WO2019137521A1 (zh) 会话管理方法、设备及系统
CN110677845A (zh) 一种确定应用功能请求状态的方法、网元及系统
RU2776778C2 (ru) Способ и оборудование установления сеанса
WO2019096318A1 (zh) 一种会话切换方法、设备及系统

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 18878075

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2018878075

Country of ref document: EP

Effective date: 20190715

ENP Entry into the national phase

Ref document number: 2020526870

Country of ref document: JP

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

ENP Entry into the national phase

Ref document number: 2018366776

Country of ref document: AU

Date of ref document: 20181117

Kind code of ref document: A

ENP Entry into the national phase

Ref document number: 20207017559

Country of ref document: KR

Kind code of ref document: A

REG Reference to national code

Ref country code: BR

Ref legal event code: B01A

Ref document number: 112020009803

Country of ref document: BR

ENP Entry into the national phase

Ref document number: 112020009803

Country of ref document: BR

Kind code of ref document: A2

Effective date: 20200515

WWG Wipo information: grant in national office

Ref document number: 201880074532.6

Country of ref document: CN