WO2018166306A1 - 核心网控制面设备选择方法和装置 - Google Patents

核心网控制面设备选择方法和装置 Download PDF

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Publication number
WO2018166306A1
WO2018166306A1 PCT/CN2018/075372 CN2018075372W WO2018166306A1 WO 2018166306 A1 WO2018166306 A1 WO 2018166306A1 CN 2018075372 W CN2018075372 W CN 2018075372W WO 2018166306 A1 WO2018166306 A1 WO 2018166306A1
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Prior art keywords
control plane
core network
network control
terminal device
plane device
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PCT/CN2018/075372
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English (en)
French (fr)
Inventor
朱方园
余芳
李岩
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华为技术有限公司
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Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP18746065.4A priority Critical patent/EP3402253B1/en
Priority to BR112019019050A priority patent/BR112019019050A2/pt
Priority to AU2018233216A priority patent/AU2018233216B2/en
Priority to JP2019550790A priority patent/JP6908720B2/ja
Priority to KR1020197028079A priority patent/KR102245992B1/ko
Priority to US16/100,877 priority patent/US10582551B2/en
Publication of WO2018166306A1 publication Critical patent/WO2018166306A1/zh
Priority to US16/781,593 priority patent/US20200178323A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/08—Access security
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0247—Traffic management, e.g. flow control or congestion control based on conditions of the access network or the infrastructure network
    • 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
    • H04W36/0033—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/10—Reselecting an access point controller
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/34—Reselection control
    • H04W36/36—Reselection control by user or terminal equipment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/34—Reselection control
    • H04W36/38—Reselection control by fixed network equipment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/24—Connectivity information management, e.g. connectivity discovery or connectivity update
    • H04W40/248—Connectivity information update
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/18—Selecting a network or a communication service
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • 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
    • H04W60/00—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
    • H04W60/06—De-registration or detaching
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/11—Allocation or use of connection identifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/27—Transitions between radio resource control [RRC] states
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/18—Processing of user or subscriber data, e.g. subscribed services, user preferences or user profiles; Transfer of user or subscriber data
    • H04W8/20—Transfer of user or subscriber data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/22—Processing or transfer of terminal data, e.g. status or physical capabilities
    • H04W8/24—Transfer of terminal data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/26—Network addressing or numbering for mobility support
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/12—Access point controller devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/14—Backbone network devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/04—Interfaces between hierarchically different network devices
    • H04W92/10—Interfaces between hierarchically different network devices between terminal device and access point, i.e. wireless air interface

Definitions

  • the present application relates to the field of communications, and in particular, to a core network control plane device selection method and apparatus.
  • Network slicing technology is a technology that uses virtual network function (VNF) to provide multiple virtual logical network slices on the same network infrastructure.
  • VNF virtual network function
  • Different types of network slicing in terms of function, performance, security, operation and maintenance, etc.
  • Different network features enable different user equipments to access different network slices according to their respective requirements, thus ensuring the service quality requirements of different services.
  • the user equipment needs to be registered on the management device to access the network slice.
  • the source network slice accessed by the user equipment and the registered source management device are generally determined according to the subscription data of the user equipment.
  • the subscription data of the user equipment changes, there may be a situation in which the source network slice accessed by the user equipment cannot meet the requirements of the user equipment.
  • the user equipment is triggered to initiate a redirection process to redirect to the new management device in the new network slice.
  • the source management device may determine the target management device of the target network slice according to the subscription data. Since the source management device stores the context information of the terminal device, the new management device may request the source management device to acquire the terminal device. Context. However, when there is an isolation requirement between the source network slice and the new network slice, the source network slice cannot determine the target network slice according to the subscription data. In this case, if the terminal device still adopts the foregoing redirection method, There is a phenomenon that a new management device accesses the source management device to obtain the context of the terminal device, which affects the isolation between the source network slice and the new network slice, and reduces the security of the network slice.
  • the present invention provides a core network control plane device selection method and device, which is used to solve the problem that the existing terminal device affects the security of the network slice during the redirection process.
  • the application provides a core network control plane device selection method, including:
  • the source core network control plane device obtains the first network slice selection auxiliary information of the terminal device,
  • the source core network control plane device If the source core network control plane device cannot determine the target core network control plane device indexed by the first network slice selection assistance information, the source core network control plane device sends the first network slice to the terminal device
  • the auxiliary information and the first indication information are selected to trigger the terminal device to send a first registration request message, where the first indication information is used to indicate that the temporary identifier of the terminal device is invalid, and the first registration request message is carried.
  • the first network slice selects auxiliary information and a permanent identifier of the terminal device.
  • the source core network control plane device After receiving the first NSSAI indicating the target core network control plane device, the source core network control plane device sends the target core network control plane device to the terminal device after determining the target core network control plane device indexed by the first NSSAI.
  • the first indication information indicating that the temporary identifier setting of the terminal device is invalid, so that the terminal device sends a registration request message carrying the permanent identifier of the first NSSAI and the terminal device to the access network device, thereby preventing the target core network device from receiving the temporary
  • the source network control plane device requests the context information of the terminal device, and the information interaction between the source core network control plane device and the target core network control plane device is eliminated, thereby improving the security between the network slices and improving the security.
  • the process efficiency of the terminal device redirection to the control plane of the target core network saves signaling.
  • the method further includes:
  • the source core network control plane device sets the temporary identifier of the terminal device to be invalid.
  • the target core network control plane device is configured to obtain the address of the source core network control plane device according to the temporary identifier, and access the source core network control plane device to obtain the context of the terminal device, thereby improving network slice security isolation.
  • the source core network control plane device acquires the first network slice selection assistance information of the terminal device, including:
  • the source core network control plane device acquires subscription data of the terminal device from a user data management center device;
  • the source core network control plane device determines the first network slice selection assistance information according to the subscription data.
  • the source core network control plane device itself can obtain the first NSSAI according to the subscription data of the terminal device, and consumes less signaling.
  • the source core network control plane device acquires the first network slice selection assistance information of the terminal device, including:
  • the source core network control plane device acquires subscription data of the terminal device from a user data management center device;
  • the source core network control plane device receives the first network slice selection assistance information from the default core network control plane device.
  • the source core network control plane device When the source core network control plane device cannot obtain the first NSSAI according to the subscription data, the source core network control plane device sends the subscription data to the default core network control plane device, so that the default core network control plane device obtains the first according to the subscription data. NSSAI, and send the first NSSAI to the source core network control plane device.
  • the problem that the terminal device redirection may be unsuccessful may be caused when the source core network control plane device cannot obtain the first NSSAI according to the subscription data.
  • the method before the source core network control plane device is unable to determine the target core network control plane device that is indexed by the first network slice selection assistance information, the method further includes:
  • the source core network control plane device determines, according to the first network slice selection assistance information, that the source core network control plane device cannot continue to serve the terminal device.
  • the method further includes:
  • the source core network control plane device receives a second registration request message from the terminal device, the second registration request message carries second network slice selection assistance information, and the second network slice selection assistance information is used to index the Source core network control plane device.
  • the source core network control plane device determines, according to the first network slice selection assistance information, that the source core network control plane device cannot continue to serve the terminal device, including:
  • the source core network control plane device Determining, by the source core network control plane device, that the slice type or service type associated with the first network slice selection assistance information is not within the slice type or service type range associated with the second network slice selection auxiliary information, The source core network control plane device cannot continue to serve the terminal device.
  • the source core network control plane device cannot determine the target core network control plane device that is indexed by the first network slice selection assistance information, and includes:
  • the source core network control plane device sends the first network slice selection assistance information to the default core network control plane device to request the target core network control plane device indexed by the first network slice selection auxiliary information;
  • the source core network control plane device cannot determine the target core network control plane device indexed by the first network slice selection assistance information.
  • the method further includes:
  • the source core network control plane device deregisters the terminal device from the source core network control plane device.
  • the terminal device is registered from the source core network control plane device, so that the source core network control plane device no longer provides services for the terminal device, which avoids service interaction between different network slices and improves security.
  • the source core network control plane device registers the terminal device from the source core network control plane device, including:
  • the source core network control plane device deletes context information of the terminal device stored by the source core network control plane device.
  • the present application provides a method for selecting a core network control plane device, which is a terminal device side corresponding to the core network control plane device selection method provided by the foregoing first aspect, and includes:
  • the terminal device receives the first network slice selection assistance information and the first indication information from the source core network control plane device, where the first network slice selection auxiliary information is used to index the target core network control plane device, where the first indication information is used. Instructing the temporary identifier of the terminal device to be invalid;
  • the terminal device sends a first registration request message to the access network device according to the first network slice selection auxiliary information and the first indication information;
  • the first registration request message carries the first network slice selection assistance information and the permanent identifier of the terminal device.
  • the application provides a core network control plane device selection method, including:
  • the source core network control plane device determines whether the first network slice selection auxiliary information can be determined, and the first network slice selection auxiliary information is used to index the target core network control plane device;
  • the source core network control plane device If the source core network control plane device cannot determine the first network slice selection assistance information, the source core network control plane device sends the third network slice selection assistance information and the first indication information to the terminal device to trigger The terminal device sends a third registration request message, where the first indication information is used to indicate that the temporary identifier of the terminal device is invalid, and the third network slice selection auxiliary information is used to index the default core network control plane device.
  • the third registration request message carries the third network slice selection assistance information and the permanent identifier of the terminal device.
  • the method further includes:
  • the source core network control plane device sets the temporary identifier of the terminal device to be invalid.
  • the method further includes:
  • the source core network control plane device deregisters the terminal device from the source core network control plane device.
  • the present application provides a method for selecting a core network control plane device, and a method for a terminal device side corresponding to the core network control plane device selection method provided by the foregoing third aspect, including:
  • the terminal device receives the third network slice selection auxiliary information and the first indication information from the source core network control plane device, where the third network slice selection auxiliary information is used to index the default core network control plane device, where the first indication information is used by the terminal information Instructing the temporary identifier of the terminal device to be invalid;
  • the terminal device sends a third registration request message to the access network device according to the third network slice selection auxiliary information and the first indication information;
  • the third registration request message carries the third network slice selection assistance information and the permanent identifier of the terminal device.
  • the present disclosure provides a method for selecting a core network control plane device, and a method for a default core network control plane device side corresponding to the core network control plane device selection method provided by the foregoing third aspect, including:
  • the default core network control plane device receives a third registration request message from the access network device, where the third registration request message carries the permanent identifier of the terminal device;
  • the default core network control plane device acquires subscription data of the terminal device from the user data management center device according to the permanent identifier
  • the default core network control plane device redirects the terminal device to the target core network control plane device.
  • the default core network control plane device redirects the terminal device to the target core network control plane device, including:
  • the default core network control plane device sends a first redirection indication message to the access network device, where the first redirection indication message is used to trigger the access network device to redirect the terminal device to the target Core network control plane device; or,
  • the default core network control plane device sends a second redirection indication message to the target core network control plane device, where the second redirection indication message is used to trigger the target core network control plane device to complete the terminal device Redirection.
  • the sixth to tenth aspects of the present application further provide a core network control plane device and a terminal device, which are respectively used to perform the core network control plane device selection method according to the foregoing first to fifth aspects, and have the same technical features and technical effects. This application will not go into details here.
  • the present application provides a core network control plane device, which is used as a source core network control plane device, and is configured to perform the core network control plane device selection method in the foregoing first aspect, including:
  • An obtaining module configured to acquire a first network slice selection auxiliary information of the terminal device, where
  • a sending module configured to: if the source core network control plane device cannot determine a target core network control plane device that is indexed by the first network slice selection auxiliary information, where the source core network control plane device sends the target device to the terminal device.
  • the first network slice selection auxiliary information and the first indication information are used to trigger the terminal device to send a first registration request message, where the first indication information is used to indicate that the temporary identifier of the terminal device is invalid,
  • a registration request message carries the first network slice selection assistance information and a permanent identity of the terminal device.
  • the core network control plane device further includes:
  • a temporary identifier setting module for setting the temporary identifier of the terminal device to be invalid.
  • the acquiring module is specifically configured to:
  • the acquiring module is specifically configured to:
  • the core network control plane device further includes:
  • the service detecting module is configured to determine, according to the first network slice selection auxiliary information, that the source core network control plane device cannot continue to serve the terminal device.
  • the core network control plane device further includes:
  • a receiving module configured to receive a second registration request message from the terminal device, where the second registration request message carries second network slice selection auxiliary information, where the second network slice selection auxiliary information is used to index the source core network Control surface device
  • the service detecting module is specifically configured to determine that a slice type or a service type associated with the first network slice selection auxiliary information is not within a slice type or a service type range associated with the second network slice selection auxiliary information, It is determined that the source core network control plane device cannot continue to serve the terminal device.
  • the core network control plane device further includes:
  • a target core network control plane device acquiring module configured to send the first network slice selection auxiliary information to a default core network control plane device, to request a target core network control plane device that is indexed by the first network slice selection auxiliary information ;
  • the source core network control plane device cannot determine the target core network control plane device indexed by the first network slice selection assistance information.
  • the core network control plane device further includes:
  • the registration module is used to register the terminal device from the source core network control plane device.
  • the de-registration module is specifically configured to delete context information of the terminal device stored by the source core network control plane device.
  • the present application provides a terminal device, which is used to perform the core network control plane device selection method in the foregoing second aspect, including:
  • a receiving module configured to receive first network slice selection assistance information and first indication information from a source core network control plane device, where the first network slice selection assistance information is used to index a target core network control plane device, where the first indication The information is used to indicate that the temporary identifier of the terminal device is invalid;
  • a sending module configured to send, according to the first network slice selection auxiliary information and the first indication information, a first registration request message to an access network device;
  • the first registration request message carries the first network slice selection assistance information and the permanent identifier of the terminal device.
  • the present application provides a core network control plane device, as a source core network control panel device, for performing the core network control plane device selection method in the foregoing third aspect, including:
  • a determining module configured to determine whether the first network slice selection auxiliary information can be determined, where the first network slice selection auxiliary information is used to index the target core network control plane device;
  • a sending module configured to: if the source core network control plane device cannot determine the first network slice selection auxiliary information, send third network slice selection auxiliary information and first indication information to the terminal device, to trigger the terminal
  • the device sends a third registration request message, where the first indication information is used to indicate that the temporary identifier of the terminal device is invalid, and the third network slice selection assistance information is used to index a default core network control plane device,
  • the third registration request message carries the third network slice selection assistance information and the permanent identifier of the terminal device.
  • the method further includes:
  • the temporary identifier setting module is configured to set the temporary identifier of the terminal device to be invalid.
  • the method further includes:
  • a registration module is configured to register the terminal device from the source core network control plane device.
  • the ninth aspect the application provides a terminal device, which is used to perform the core network control plane device selection method in the foregoing fourth aspect, including:
  • a receiving module configured to receive third network slice selection auxiliary information and first indication information from a source core network control plane device, where the third network slice selection auxiliary information is used to index a default core network control plane device, where the first The indication information is used to indicate that the temporary identifier of the terminal device is invalid;
  • a sending module configured to send a third registration request message to the access network device according to the third network slice selection auxiliary information and the first indication information
  • the third registration request message carries the third network slice selection assistance information and the permanent identifier of the terminal device.
  • the application provides a core network control plane device, as a default core network control panel device, for performing the core network control plane device selection method in the foregoing fifth aspect, including:
  • a receiving module configured to receive a third registration request message from the access network device, where the third registration request message carries a permanent identifier of the terminal device;
  • the subscription data obtaining module is configured to acquire the subscription data of the terminal device from the user data management center device according to the permanent identifier
  • a target core network control plane device acquiring module configured to determine, according to the subscription data, a target core network control plane device of the terminal device;
  • a redirection module for redirecting the terminal device to the target core network control plane device.
  • the redirection module further includes:
  • a sending unit configured to send a first redirection indication message to the access network device, where the first redirection indication message is used to trigger the access network device to redirect the terminal device to the target core network control plane device; or to the target core network
  • the control plane device sends a second redirection indication message, where the second redirection indication message is used to trigger the target core network control plane device to complete the redirection of the terminal device.
  • the present application further provides a core network control plane device, an access network device, and a terminal device, which are used to perform the core network control plane device selection method according to the foregoing first to fifth aspects, and have the same technical features and technical effects. I won't go into details here.
  • the present application provides a core network control plane device, as a first core network control panel device, for performing the core network control plane device selection method in the foregoing first aspect, including:
  • a processor configured to acquire first network slice selection assistance information of the terminal device, where
  • a transmitter configured to: if the first core network control plane device cannot determine the second core network control plane device indexed by the first network slice selection assistance information, the first core network control plane device to the terminal The device sends the first network slice selection assistance information and the first indication information to trigger the terminal device to send a first registration request message, where the first indication information is used to indicate that the temporary identifier of the terminal device is invalid.
  • the first registration request message carries the first network slice selection assistance information and a permanent identifier of the terminal device.
  • the processor is further configured to set the temporary identifier of the terminal device to be invalid.
  • the processor is specifically configured to:
  • the first network slice selection assistance information is determined according to the subscription data.
  • the processor is specifically configured to acquire subscription data of the terminal device from the user data management center device;
  • the transmitter is further configured to send the subscription data to the third core network control plane device to request the first network slice selection auxiliary information of the terminal device;
  • the first core network control plane device further includes: a receiver;
  • the receiver is configured to receive first network slice selection assistance information from a third core network control plane device.
  • the processor is specifically configured to:
  • the receiver is further configured to
  • the processor is further configured to:
  • the transmitter is further configured to:
  • the processor is further configured to: if the request fails, confirm that the first core network control plane device cannot determine the second core network control plane device that is indexed by the first network slice selection assistance information.
  • the processor is further configured to:
  • the terminal device is registered from the first core network control plane device.
  • the processor is specifically configured to delete context information of the terminal device that is stored by the first core network control plane device.
  • the present application provides a terminal device, which is used to perform the method for selecting a core network control plane device in the foregoing second aspect, including:
  • a receiver configured to receive first network slice selection assistance information and first indication information from the first core network control plane device, where the first network slice selection auxiliary information is used to index the second core network control plane device, where the first indication information is used
  • the temporary identifier indicating the terminal device is invalid
  • a transmitter configured to send, according to the first network slice selection auxiliary information and the first indication information, a first registration request message to the access network device;
  • the first registration request message carries the first network slice selection auxiliary information and the permanent identifier of the terminal device.
  • the present application provides a core network control plane device, as a fourth core network control panel device, for performing the core network control plane device selection method in the foregoing third aspect, including:
  • a processor configured to determine whether the first network slice selection auxiliary information can be determined, where the first network slice selection auxiliary information is used to index the fifth core network control plane device;
  • a transmitter configured to: if the fourth core network control plane device cannot determine the first network slice selection assistance information, send the third network slice selection assistance information and the first indication information to the terminal device, to trigger the terminal device to send the third registration a request message, where the first indication information is used to indicate that the temporary identifier of the terminal device is invalid, the third network slice selection auxiliary information is used to index the sixth network control plane device, and the third registration request message carries the third network slice selection auxiliary information. And permanent identification of the terminal device.
  • the processor is further configured to:
  • the processor is further configured to: deregister the terminal device from the fourth core network control plane device.
  • the present application provides a terminal device, which is used to perform the core network control plane device selection method in the foregoing fourth aspect, including:
  • a receiver configured to receive third network slice selection assistance information and first indication information from the fourth core network control plane device, where the third network slice selection assistance information is used to index the sixth core network control plane device, where the first indication information is used
  • the temporary identifier indicating the terminal device is invalid
  • a transmitter configured to send, according to the third network slice selection auxiliary information and the first indication information, a third registration request message to the access network device;
  • the third registration request message carries the third network slice selection auxiliary information and the permanent identifier of the terminal device.
  • the present application provides a core network control plane device, as a sixth core network control panel device, for performing the core network control plane device selection method in the foregoing fifth aspect, including:
  • a receiver configured to receive a third registration request message from the access network device, where the third registration request message carries a permanent identifier of the terminal device;
  • a processor configured to acquire subscription data of the terminal device from the user data management center device according to the permanent identifier
  • the processor is further configured to determine, according to the subscription data, a fifth core network control plane device of the terminal device;
  • the processor is further configured to redirect the terminal device to the fifth core network control plane device.
  • the core network control plane device further includes:
  • a transmitter configured to send a first redirection indication message to the access network device, where the first redirection indication message is used to trigger the access network device to redirect the terminal device to the fifth core network control plane device;
  • the embodiment of the present application provides a program for executing the method of the first aspect described above when executed by a processor.
  • the embodiment of the present application provides a program product, such as a computer readable storage medium, including the program of the sixteenth aspect.
  • the embodiment of the present application provides a computer readable storage medium, wherein the computer readable storage medium stores instructions that, when run on a computer, cause the computer to perform the method of the first aspect.
  • the embodiment of the present application provides a program for executing the method of the second aspect described above when executed by a processor.
  • the embodiment of the present application provides a program product, such as a computer readable storage medium, including the program of the nineteenth aspect.
  • an embodiment of the present application provides a computer readable storage medium, wherein the computer readable storage medium stores instructions that, when run on a computer, cause the computer to perform the method of the second aspect.
  • the embodiment of the present application provides a program, when executed by a processor, is used to execute the method of the foregoing third aspect.
  • the embodiment of the present application provides a program product, such as a computer readable storage medium, including the program of the twenty-second aspect.
  • the embodiment of the present application provides a computer readable storage medium, wherein the computer readable storage medium stores instructions, and when executed on a computer, causes the computer to execute the method of the third aspect.
  • the embodiment of the present application provides a program for executing the method of the fourth aspect described above when executed by a processor.
  • the embodiment of the present application provides a program product, such as a computer readable storage medium, including the program of the twenty-fifth aspect.
  • the embodiment of the present application provides a computer readable storage medium, wherein the computer readable storage medium stores instructions that, when run on a computer, cause the computer to perform the method of the fourth aspect.
  • the embodiment of the present application provides a program for executing the method of the above fifth aspect when executed by a processor.
  • the embodiment of the present application provides a program product, such as a computer readable storage medium, including the program of the twenty-eighth aspect.
  • the embodiment of the present application provides a computer readable storage medium, wherein the computer readable storage medium stores instructions, when executed on a computer, causing the computer to execute the method of the fifth aspect.
  • an embodiment of the present application provides a program for executing the method of the sixth aspect described above when executed by a processor.
  • the embodiment of the present application provides a program product, such as a computer readable storage medium, including the program of the thirty-first aspect.
  • an embodiment of the present application provides a computer readable storage medium, where the computer readable storage medium stores instructions, and when executed on a computer, causes the computer to execute the method of the sixth aspect.
  • FIG. 1 shows a system architecture that may be applicable to an embodiment of the present application
  • FIG. 2 is a signaling interaction diagram of a method for selecting a control device of a core network according to an embodiment of the present disclosure
  • FIG. 3 is a signaling interaction diagram of a core network control plane device selection method according to an embodiment of the present disclosure
  • FIG. 4 is a signaling interaction diagram of a method for selecting a control device of a core network according to an embodiment of the present disclosure
  • FIG. 5 is a signaling interaction diagram of a method for selecting a control device of a core network according to an embodiment of the present disclosure
  • FIG. 6 is a schematic structural diagram of a control device of a core network according to an embodiment of the present disclosure.
  • FIG. 7 is a schematic structural diagram of a control device of a core network according to another embodiment of the present disclosure.
  • FIG. 8 is a schematic structural diagram of a terminal device according to an embodiment of the present disclosure.
  • FIG. 9 is a schematic structural diagram of a control device of a core network according to an embodiment of the present disclosure.
  • FIG. 10 is a schematic structural diagram of a terminal device according to an embodiment of the present disclosure.
  • FIG. 11 is a schematic structural diagram of a control device of a core network according to an embodiment of the present disclosure.
  • FIG. 12 is a schematic structural diagram of a control device of a core network according to an embodiment of the present disclosure.
  • FIG. 13 is a schematic structural diagram of a terminal device according to an embodiment of the present disclosure.
  • FIG. 14 is a schematic structural diagram of a control device of a core network according to an embodiment of the present disclosure.
  • FIG. 15 is a schematic structural diagram of a terminal device according to an embodiment of the present disclosure.
  • FIG. 16 is a schematic structural diagram of a control device of a core network according to an embodiment of the present disclosure.
  • the network architecture and the service scenario described in this application are for the purpose of more clearly explaining the technical solutions of the present application, and do not constitute a limitation of the technical solutions provided by the present application.
  • Those skilled in the art may know that with the evolution of the network architecture and new business scenarios, The technical solution provided by the present application is equally applicable to similar technical problems.
  • FIG. 1 illustrates a system architecture that may be applicable to embodiments of the present application.
  • the system architecture provided in this embodiment includes at least one terminal device, at least one access network device, at least one core network control plane device, at least one default core network control plane device, and at least one user data management. Central equipment.
  • Each network slice can be regarded as a complete network, and network slices corresponding to different types of services can adopt different network forms. For example, different protocol stack structures are used on the data plane or the signaling plane to better match the characteristics of the service. Network slices are divided on the data plane to share common control plane functions.
  • a network slice consists of a set of one or more network functions and resources that can run these network functions.
  • the core network deploys network slicing
  • the network slice selection process is triggered.
  • the selection process of the network slice depends on the subscription data of the terminal device, local configuration information, roaming protocol, operator's policy, and the like.
  • the terminal device may access one or more network slices, and multiple network slices may share part of the control plane function to implement terminal granularity functions, such as mobility management.
  • the terminal device may provide Network Slice Selection Assistance Information (NSSAI) to the core network, and the core network selects a network slice instance for the terminal device.
  • NSSAI Network Slice Selection Assistance Information
  • the terminal device communicates with the core network through the access network device.
  • the terminal device can be a wireless terminal or a wired terminal.
  • the wireless terminal can be a device that provides voice and/or other service data connectivity to the user, a handheld device with wireless connectivity, or other processing device that is connected to the wireless modem.
  • the wireless terminal can communicate with one or more core networks via a Radio Access Network (RAN), which can be a mobile terminal, such as a mobile phone (or "cellular" phone) and a computer with a mobile terminal.
  • RAN Radio Access Network
  • it may be a portable, pocket, handheld, computer built-in or in-vehicle mobile device that exchanges language and/or data with a wireless access network.
  • the wireless terminal may also be referred to as a system, a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, a remote terminal, and a remote terminal.
  • the access terminal, the user terminal (User Terminal), the user agent (User Agent), and the station device (Station, STA) are not limited herein.
  • FIG. 1 schematically depicts a possible schematic diagram in which the terminal device is a mobile phone as an example.
  • the access network device is a device that provides a network access service, and allows the terminal device to access the wireless network through the access network device.
  • the terminal device communicates with the core network through the access network device.
  • the access network device may be a Global System of Mobile communication (GSM) or a Base Transceiver Station (BTS) in Code Division Multiple Access (CDMA), or may be a wideband code.
  • GSM Global System of Mobile communication
  • BTS Base Transceiver Station
  • CDMA Code Division Multiple Access
  • the base station (NodeB, NB) in the (Wideband Code Division Multiple Access, WCDMA) may also be an evolved base station (Evolutional Node B, eNB or eNodeB) in the Long Term Evolution (LTE), or a relay station or An access point (AP), or a radio access network (RAN), or a base station in a future 5G network, is not limited herein.
  • FIG. 1 is a schematic diagram showing a possible schematic diagram of the access network device as a base station.
  • the core network control plane device is a device that provides services for the terminal device, and the main functions include: mobility management function.
  • mobility management functions include mobile state management functions, user temporary identity assignment functions, authentication and authorized user functions.
  • a core network control plane device is associated with one or more network slices, ie, multiple network slices share a core network control plane device; the terminal device accesses a particular network slice by registering at a particular core network control plane device.
  • the core network control plane device can be an Access and Mobility Management Function (AMF) device.
  • AMF Access and Mobility Management Function
  • the user data management center device is configured to store subscription data of the terminal device.
  • the subscription data of the terminal device includes subscription data related to mobility management and subscription data related to session management.
  • the user data management center device may send the changed subscription data to the core network control plane device currently registered by the terminal device.
  • the default core network control plane device is a core network control plane device that can communicate with any core network control plane device, and there is no security isolation between the default core network control plane device and any core network control plane device. The requirement is that the default core network control plane device can communicate with any core network control plane device. .
  • the core network control plane device selection method can be applied to the following scenario: when the service required by the terminal device is updated from the first type of service to the second type of service, the terminal device The performance of the originally accessed network slice 1 cannot meet the second type of service requirement, and the terminal device needs to be redirected to the network slice 3, that is, the terminal device needs to be redirected to the core network control plane device 4 of the network slice 3.
  • the source management device for example, the core network control plane device 1 stores the context information of the terminal device
  • the new management device for example, the core network control plane device 4) may request the source management device to acquire the terminal device.
  • the new management device accesses the source management device to Obtaining the context of the terminal device affects the isolation between the source network slice and the new network slice, and reduces the security of the network slice.
  • the terminal device may send a registration request message carrying the temporary identifier of the terminal device, and the target core network control plane device determines, according to the temporary identifier of the terminal device, the source core network control plane device that allocates the temporary identifier. And identifying, and sending, to the source core network control plane device, the temporary identifier of the terminal device, to request the source core network control plane device to request the stored context information of the terminal device.
  • the source core network control plane device cannot determine the target core network control plane device, there may be isolation between the target core network control plane device and the source core network control plane device, so that the two cannot communicate, and the target core appears.
  • the network control plane device requests the source core network control plane device to fail the context information of the terminal device, thereby affecting the redirection of the terminal device.
  • the registration request message carrying the permanent identification of the terminal device can be initiated by the terminal device again, so that the target core network control plane device requests the subscription data of the terminal device from the user data management center to complete the redirection. Therefore, when there is an isolation requirement between the source core network control plane device and the target core network control plane device, the source core network control plane device cannot determine the target core network control plane device, and the redirection method still has a complicated redirection step. A problem that makes the cost more expensive.
  • the first aspect of the present application provides a core network control plane device selection method, which solves the problem of how to solve the redirection problem of the terminal device when the source core network control plane device cannot determine the target core network control plane device.
  • the core network control plane device selection method provided by the present application is described in detail below by using a detailed embodiment. The following specific embodiments may be combined with each other, and the same or similar concepts or processes may not be described in some embodiments.
  • FIG. 2 is a signaling interaction diagram of a core network control plane device selection method according to an embodiment of the present disclosure. As shown in FIG. 2, the core network control plane device selection method provided by the embodiment of the present application includes the following steps:
  • the source core network control plane device acquires the first NSSAI of the terminal device,
  • the source core network control plane device in the embodiment of the present application is a core network control plane device currently registered by the terminal device, and the network slice currently accessed by the terminal device is a source network slice.
  • the source core network control plane device acquires the first NSSAI of the terminal device according to the subscription data.
  • the subscription data includes authentication information, subscription service access point name information, service level information corresponding to the access point name, access restriction data information, roaming restriction information, and the like.
  • the subscription data changes and can be changed for any of the contracted data.
  • the subscription data of the terminal device changes, the new network performance requirement is proposed on behalf of the terminal device. Therefore, there may be a situation in which the source network slice cannot meet the new requirement of the terminal device, and the appropriate network slice needs to be re-selected for the terminal device.
  • NSSAI can be used to assist the core network in selecting the appropriate network slice for the terminal device.
  • the NSSAI may be a preset standardized value or a specific value within a Public Land Mobile Network (PLMN).
  • PLMN Public Land Mobile Network
  • the NSSAI can also be a collection of session management network slice selection assistance information (Session Management-NSSAI, SM-NSSAI).
  • the source core network control plane device may determine the NSSAI corresponding to the new subscription information of the terminal device, determine the target network slice type according to the NSSAI, and further determine the target associated with the target network slice type for the terminal device. Core network control plane device.
  • the new subscription information of the terminal device includes the first NSSAI, and the source core network control plane device directly obtains the first NSSAI from the new subscription information.
  • the source core network control plane device cannot determine the target core network control plane device that is indexed by the first NSSAI.
  • different network slices have different security level requirements.
  • there is an isolation requirement between the network slice and other network slices that is, the two network slices respectively contain Communication between devices is not possible.
  • there is security isolation between two network slices there is no shared core network control plane device between the two network slices. And the core network control plane devices inside the two network slices cannot communicate with each other.
  • the source core network control plane device needs to determine the first NSSAI according to the first NSSAI before the source network control plane device triggers the terminal device to initiate the redirection process.
  • the target core network control plane device of the index As described above, if there is security isolation between the source network slice and the target network slice, the source core network control plane device cannot determine the target core network control plane device indexed by the first NSSAI.
  • the source core network control plane device sends the first NSSAI and the first indication information to the terminal device.
  • the first indication information is used to indicate that the temporary identifier of the terminal device is invalid.
  • the source core network control plane device may send the first NSSAI and the first indication information to the terminal device by using the access network device.
  • the signaling interaction between the source core network control plane device and the terminal device in the following embodiments may be accessed through the access network device, and details are not described herein again.
  • the implementation of the application further includes:
  • the source core network control plane device sets the temporary identifier of the terminal device to be invalid.
  • the source core network control plane device when the source core network control plane device cannot determine the target core network control plane device indexed by the first NSSAI, the source core network control plane device sets the temporary identifier of the terminal device to be invalid. The temporary identity of the terminal device is set to be invalid. When the subsequent terminal device initiates the registration request message, the registration request message will not carry the temporary identifier of the terminal device, thereby preventing the target core network control plane device from acquiring the source core network according to the temporary identifier. The address of the control plane device is accessed, and the source core network control plane device is accessed to obtain the context of the terminal device, thereby improving network slice security isolation.
  • the implementation of the application further includes:
  • the source core network control plane device registers the terminal device from the source core network control plane device. For example, the source core network control plane device deletes the context information of the terminal device stored by the source core network control plane device to register the terminal device from the source core network control plane device.
  • the source core network control plane device registers the terminal device from the source core network control plane device, so that the source core network control plane device no longer provides services for the terminal device. .
  • the context information of the terminal device is no longer stored in the source core network control plane device. Therefore, the terminal device or any core network control plane device cannot request the context information of the terminal device from the source core network control plane device, thereby avoiding service interaction and improving security.
  • the terminal device sends a first registration request message to the access network device according to the first NSSAI and the first indication information, where the first registration request message carries the first NSSAI and the permanent identifier of the terminal device.
  • the source core network control plane device sends the first NSSAI and the first indication information to the terminal device, where the first NSSAI is used to index the target core network control plane device, and the first indication information is used to indicate that the temporary identifier of the terminal device is invalid.
  • the first NSSAI and the first indication information are used to trigger the terminal device to initiate a registration request procedure.
  • the terminal device sends a first registration request message to the access network device, where the first registration request carries the permanent identifier of the terminal device.
  • the terminal device sends a first registration request message to the target core network control plane device indicated by the first NSSAI through the access network device to redirect the terminal device to the target core network control plane device.
  • the terminal device learns that the temporary identifier of the terminal device has expired and sends a first registration request message to the access network device according to the first NSSAI.
  • the manner in which the terminal device sends the first registration request message may be:
  • the terminal device may send the radio resource control (RRC) message between the terminal device and the access network device.
  • RRC radio resource control
  • the RRC message carries the first NSSAI and the PLMN selected by the terminal device.
  • the access network device determines the target core network control plane device of the terminal device according to the first NSSAI in the RRC message and the PLMN selected by the terminal device, and forwards the first registration request message to the target core network control plane device.
  • the target core network control plane device requests the subscription data of the terminal device from the user data management center device according to the permanent identifier of the terminal device, and completes the registration of the terminal device on the target core network control plane device according to the subscription data. Process.
  • the first registration request may be a non-access stratum (NAS) message, and the NAS message carries the permanent identifier of the terminal device and the first NSSAI.
  • the permanent identifier of the terminal device may be an International Mobile Subscriber Identity (IMSI) or a Subscriber Permanent Identity (SUPI).
  • IMSI International Mobile Subscriber Identity
  • SUPI Subscriber Permanent Identity
  • the source core network control plane device receives the first NSSAI indicating the target core network control plane device, and fails to determine the target core network control plane device indexed by the first NSSAI
  • the source core network control plane device learns that the source core network control plane device needs to be isolated from the target core network control plane device, and the source core network control plane device sends the first NSSAI and the first indication information to the terminal device, and the terminal device learns the terminal device according to the first indication information.
  • the registration request message carrying the first NSSAI and the permanent identifier of the terminal device is sent to the access network device, thereby avoiding information interaction between the source core network control plane device and the target core network control plane device.
  • the security between the network slices is improved, and the process efficiency of the terminal device redirection to the control plane of the target core network is improved, and signaling is saved.
  • the source core network control plane device sets the temporary identifier of the terminal device to be invalid, and the terminal device is registered from the source core network control plane device, so that the source core network control plane device no longer provides services for the terminal device, thereby avoiding
  • the terminal device performs service interaction with the source core network control plane device again, which improves network slice security.
  • the core network control plane device selection method provided by the present application improves network slice security and terminal device redirection process efficiency, and saves signaling.
  • FIG. 3 and FIG. 4 respectively perform two possible implementation manners of the target core network control plane device that the source core network control plane device cannot determine by the first NSSAI. Further description.
  • FIG. 3 and FIG. 4 are signaling interaction diagrams of a core network control plane device selection method according to an embodiment of the present application.
  • a core network control plane device selection method provided by an embodiment of the present application includes the following steps:
  • the source core network control plane device acquires subscription data of the terminal device from the user data management center device.
  • the source core network control plane device receives the subscription data of the terminal device sent by the user data management center device. After the user data management center device discovers that the subscription data of the terminal device stored therein is changed, the user data management center device determines the source core network control plane device currently registered by the terminal device according to the permanent identifier of the terminal device. Then, the user data management center device sends the new subscription data of the terminal device and the permanent identifier of the terminal device to the source core network control plane device.
  • the manner in which the user data management center device sends the subscription data may be:
  • the user data management center device sends the new subscription data of the terminal device to the source core network control plane device by inserting the subscription data request message.
  • the source core network control plane device receives the new subscription data of the terminal device and the permanent identifier of the terminal device, the source core network control plane device can determine which specific terminal device is registered on the source core network control plane device. The contract data has changed.
  • the source core network control plane device may further send an insertion subscription data response message to the user data management center device.
  • the source core network control plane device determines the first NSSAI according to the subscription data.
  • the source core network control plane device when the source core network control plane device receives the new subscription data of the terminal device, the source core network control plane device compares the new subscription data of the terminal device with the old subscription data of the terminal device, and determines that the subscription data occurs. Whether the changed project leads to a change in NSSAI. If the NSSAI changes, the source core network control plane device obtains the first NSSAI according to the changed item in the subscription data. In an optional implementation manner, the source core network control plane device may configure a correspondence between the subscription data and the NSSAI, and determine the NSSAI by using the subscription data.
  • the source core network control plane device when the source core network control plane device receives the new subscription data of the terminal device, the new subscription data includes the first NSSAI, and the source core network control plane device can directly obtain the first NSSAI. If the changed item in the subscription data does not cause the NSSAI to change, the terminal device does not need to perform the redirection registration of the core network control plane device.
  • the source core network control plane device cannot determine the target core network control plane device that is indexed by the first NSSAI.
  • the source core network control plane device when there is an isolation requirement between the source core network control plane device and the target core network control plane device indexed by the first NSSAI, the source core network control plane device cannot determine the target core network control plane device indexed by the first NSSAI.
  • the terminal device can send the first NSSAI and the terminal to the access network device.
  • the target core network control plane device may request the context information of the terminal device from the source core network control plane device according to the temporary identifier of the terminal device, thereby completing the registration process or the TAU process.
  • the core network control plane device selection method provided by the embodiment of the present application further includes:
  • the source core network control plane device receives the second registration request message from the terminal device, where the second registration request message carries the second NSSAI, and the second NSSAI is used to index the source core network control plane device.
  • the terminal device before the terminal device accesses the PLMN, the terminal device is pre-configured with NSSAI (Configured NSSAI), that is, the second NSSAI.
  • the Configured NSSAI is used to indicate an optional network slice of the terminal device in the selected PLMN.
  • the terminal device sends an initial registration request to the access network device device, where the initial registration request carries the Configured NSSAI, and the access network device sets the permanent identifier of the terminal device in the initial registration request according to the Configured NSSAI. It is sent to the core network control plane device corresponding to the Configured NSSAI, that is, the source core network control plane device, thereby completing the initial registration of the terminal device.
  • the source core network control plane device determines that the target core network control plane device indexed by the first NSSAI cannot be determined, the source core network control plane device further needs to determine whether the source core network control plane device can continue to serve the terminal device. .
  • the way to determine whether the source core network control plane device can continue to serve the terminal device is:
  • the source core network control plane device determines the first NSSAI according to the latest subscription data, and determines that the slice type or service type associated with the first NSSAI is not within the slice type or service type range associated with the source core network control plane device, indicating that the terminal The device cannot access the target network slice indicated by the first NSSAI through the source core network control plane device, and then determines that the source core network control plane device cannot continue to serve the terminal device. If the source core network control plane device determines that the source core network control plane device cannot continue to serve the terminal device, further determining whether the source network slice can determine the target core network control plane device indexed by the first NSSAI.
  • the terminal device does not need to perform redirection registration of the core network control plane device, and may still be registered on the source core network control plane device, and The source core network control plane device accesses the target network slice.
  • the terminal device may be served by the same core network control plane device. If the slice type associated with the second NSSAI of the terminal device includes 1, 2, and 3, when the slice type associated with the first NSSAI of the terminal device includes 1 and/or 2, the source core network control plane device is considered to continue to serve. The terminal device; when the slice type associated with the first NSSAI of the terminal device includes 4, it is considered that the source core network control plane device cannot continue to serve the terminal device.
  • the source core network control plane device sets the temporary identifier of the terminal device to be invalid.
  • the source core network control plane device determines that the source core network control plane device cannot continue to serve the terminal device, and the source core network control plane device cannot determine the target core network control plane device indexed by the first NSSAI, the source core network control plane The device sets the temporary ID of the terminal device to be invalid.
  • the mode in which the source core network control plane device sets the temporary identifier of the terminal device to be invalid may be: setting an invalid temporary identifier for the terminal device, or setting the temporary identifier of the terminal device from the service list of the source core network control plane device. delete.
  • the source core network control plane device sends the first NSSAI and the first indication information to the terminal device.
  • the first indication information is used to indicate that the temporary identifier of the terminal device is invalid.
  • the manner in which the source core network control plane device sends the first NSSAI and the first indication information to the terminal device includes:
  • the first type if the terminal device is in the connected state, the source core network control plane device sends the first NSSAI and the first indication information to the terminal device by using the terminal device temporary identifier re-distribution process.
  • the second type if the terminal device is in an idle state, the source core network control plane device can wait for the terminal device to initiate a TAU process/service request process, complete registration with the source core network control plane device, and then the first NSSAI and the first indication information.
  • the TAU accepts the message/service request completion process and sends it to the terminal device.
  • the third type if the terminal device is in an idle state, the source core network control plane device can page the terminal device, trigger the terminal device to initiate a service request, and change from the idle state to the connected state, thereby transmitting the first mode to the terminal device in the first manner. NSSAI and first indication information.
  • the source core network control plane device sends the first NSSAI and the first indication information to the terminal device, and may also adopt other feasible manners.
  • the foregoing multiple possible implementation manners may be determined by the source core network control plane device according to the network policy. This application does not limit this.
  • the source core network control plane device registers the terminal device from the source core network control plane device.
  • the source core network control plane device deletes the context information of the terminal device from the source core network control plane device. S307.
  • the terminal device sends a first registration request message to the access network device according to the first NSSAI and the first indication information, where the access network device sends the first registration request message to the target core network control plane device; the first registration request message Carry the permanent identifier of the first NSSAI and the terminal device.
  • the terminal device carries the permanent identifier of the terminal device and the first NSSAI in the NAS message
  • the RRC message carries the first NSSAI and the PLMN selected by the terminal device.
  • the access network device selects the target core network control plane device for the terminal device according to the first NSSAI and the PLMN carried in the RRC message.
  • the access network device forwards the NAS message sent by the terminal device to the target core network control plane device.
  • the target core network control plane device acquires subscription data of the terminal device from the user data management center device according to the permanent identifier of the terminal device.
  • the target core network control plane device continues to complete the terminal device registration process according to the subscription data of the terminal device.
  • the registration process of the terminal device may adopt a registration process in the LTE system or the 5G system, which is not described in detail in this application.
  • the user data management center device when detecting that the subscription data of the terminal device changes, sends the new subscription data of the terminal device to the source core network control plane device, so that the source core network control plane device is based on the new
  • the subscription data is obtained by the first NSSAI for indexing the target core network control plane device.
  • the source core network control plane device can send the first NSSAI and the first indication information to the terminal device in different manners according to different connection status or idle state of the terminal device, thereby improving the flexibility of signaling interaction.
  • whether the source core network control plane device can continue to serve the terminal is determined according to whether the slice type or service type associated with the first NSSAI is within the slice type or service type range associated with the source core network control plane device. The device can prevent the terminal device from being redirected when the source core network control plane device can continue to serve the terminal device, thereby reducing signaling overhead.
  • FIG. 4 is a signaling interaction diagram of a method for selecting a control device of a core network according to an embodiment of the present disclosure.
  • a core network control plane device selection method provided by an embodiment of the present application includes the following steps:
  • the source core network control plane device acquires subscription data of the terminal device from the user data management center device.
  • the source core network control plane device determines the first NSSAI according to the subscription data.
  • the source core network control plane device sends a first NSSAI to the default core network control plane device to request the target core network control plane device that is indexed by the first NSSAI.
  • the default core network control plane device indicates to the source core network control plane device that the target core network control plane device indexed by the first NSSAI cannot be determined. For example, the default core network control plane device sends the second indication information to the source core network control plane device, where the second indication information is used to indicate that the target core network control plane device indexed by the first NSSAI cannot be determined. Alternatively, the default core network control plane device sends a request failure message to the source core network control plane device, or refuses to send a message to the source core network control plane device, thereby notifying the source core network control plane device that the first NSSAI index cannot be determined.
  • Target core network control plane device For example, because the isolation between the slice where the source core network control plane device is located and the slice where the target core network control plane device is located needs to be isolated, the target core network control plane device indexed by the first NSSAI cannot be determined.
  • the source core network control plane device cannot determine the target core network control plane device indexed by the first NSSAI.
  • the source core network control plane device can determine the first NSSAI according to the subscription data, but cannot determine whether the source core network control plane device and the target core network control plane device can communicate according to the first NSSAI, the source core network control plane The device knows that the target core network control plane device cannot be determined through the above step S404.
  • the source core network control plane device before the source core network control plane device determines the target core network control plane device indexed by the first NSSAI, the source core network control plane device further needs to determine the source core network control plane device. Can you continue to serve terminal devices? For example, the way to determine whether the source core network control plane device can continue to serve the terminal device is:
  • the source core network control plane device determines the first NSSAI according to the latest subscription data, and determines that the slice type or service type associated with the first NSSAI is not within the slice type or service type range associated with the source core network control plane device, indicating that the terminal The device cannot access the target network slice indicated by the first NSSAI through the source core network control plane device, and then determines that the source core network control plane device cannot continue to serve the terminal device. If the source core network control plane device determines that the source core network control plane device cannot continue to serve the terminal device, it is determined whether isolation between the source network slice and the target network slice is required.
  • the terminal device does not need to perform redirection registration of the core network control plane device, and may still be registered on the source core network control plane device, and The source core network control plane device accesses the target network slice.
  • the source core network control plane device sets the temporary identifier of the terminal device to be invalid.
  • the source core network control plane device sends the first NSSAI and the first indication information to the terminal device.
  • the first indication information is used to indicate that the temporary identifier of the terminal device is invalid.
  • the source core network control plane device registers the terminal device from the source core network control plane device.
  • the terminal device sends a first registration request message to the access network device according to the first NSSAI and the first indication information, where the access network device sends the first registration request message to the target core network control plane device; the first registration request message Carry the permanent identifier of the first NSSAI and the terminal device.
  • the target core network control plane device acquires subscription data of the terminal device from the user data management center device according to the permanent identifier of the terminal device.
  • the source core network control plane device sends the first NSSAI to the default core network control plane device, so that the default core network control plane device obtains the first NSSAI according to the subscription data, and the target core network of the first NSSAI index.
  • Control surface equipment The default core network control plane device cannot determine that the judgment result of the target core network control plane device is returned to the source core network control plane device, so that the source core network control plane device triggers subsequent operations, thereby solving the possible terminal device redirection. The question of success.
  • the second aspect of the present application further provides a method for selecting a core network control plane device.
  • the difference from any of the foregoing first embodiments is that, when the source core network control plane device cannot determine the first NSSAI, the source core network control plane device redirects the terminal device to the default core network in this embodiment. On the control plane device, the default core network control plane device serves the terminal device, and the terminal device is redirected to the target core network control plane device.
  • the core network control plane device selection method provided by the present application is described in detail below by using a detailed embodiment.
  • FIG. 5 is a signaling interaction diagram of a method for selecting a control device of a core network according to an embodiment of the present disclosure.
  • a core network control plane device selection method provided by an embodiment of the present application includes the following steps:
  • the source core network control plane device obtains subscription data of the terminal device from the user data management center device.
  • the method for obtaining the subscription data of the terminal device may be similar to the method described in any of the foregoing embodiments, and details are not described herein again.
  • the source core network control plane device determines that the first NSSAI cannot be determined, and the first NSSAI is used to index the target core network control plane device.
  • the source core network control plane device determines whether the first NSSAI of the terminal device can be determined.
  • the embodiment shown in any of the foregoing FIGS. 2 to 6 can be performed.
  • the source core network control plane device determines that the first NSSAI of the terminal device cannot be determined, and the source core network control plane device cannot determine the first NSSAI of the terminal device according to the subscription data of the terminal device, or may be the source core network control plane. The device cannot obtain the first NSSAI of the terminal device from the default core network control plane device.
  • the source core network control plane device sends a third NSSAI and the first indication information to the terminal device, where the third NSSAI is used to index the default core network control plane device, and the first indication information is used to indicate that the temporary identifier of the terminal device is invalid.
  • the three NSSAIs are used to index the default core network control plane device.
  • the source core network control plane device determines that the first NSSAI cannot be determined
  • the source core network control plane device sends the third NSSAI and the first indication information to the terminal device.
  • the terminal device receives the first indication information
  • the terminal device determines that the temporary identifier assigned by the source core network control plane device is invalid.
  • the terminal device redirects the terminal device to the default core network control plane device according to the third NSSAI.
  • the manner in which the source core network control plane device sends the third NSSAI and the first indication information to the terminal device includes:
  • the first type if the terminal device is in the connected state, the source core network control plane device sends the third NSSAI and the first indication information to the terminal device by using the terminal device temporary identifier re-distribution process.
  • the second type if the terminal device is in an idle state, the source core network control plane device selects to wait for the terminal device to initiate a TAU process/service request process, completes registration with the source core network control plane device, and then sets the third NSSAI and the first indication information.
  • the TAU accepts the message/service request completion process and sends it to the terminal device.
  • the third type if the terminal device is in the idle state, the source core network control plane device can select the paging terminal device, trigger the terminal device to initiate a service request, and change from the idle state to the connected state, thereby transmitting the first mode to the terminal device.
  • Three NSSAI and first indication information if the terminal device is in the idle state, the source core network control plane device can select the paging terminal device, trigger the terminal device to initiate a service request, and change from the idle state to the connected state, thereby transmitting the first mode to the terminal device.
  • the source core network control plane device sends the third NSSAI and the first indication information to the terminal device, and may also adopt other feasible manners.
  • the foregoing multiple possible implementation manners may be determined by the source core network control plane device according to the network policy. This application does not limit this.
  • the implementation of the application further includes:
  • the source core network control plane device sets the temporary identifier of the terminal device to be invalid.
  • the source core network control plane device determines that the first NSSAI of the terminal device cannot be determined, the source core network control plane device sets the temporary identifier of the terminal device to be invalid.
  • the mode in which the source core network control plane device sets the temporary identifier of the terminal device to be invalid may be: setting an invalid temporary identifier for the terminal device, or setting the temporary identifier of the terminal device from the service list of the source core network control plane device. delete.
  • the implementation of the application further includes:
  • the source core network control plane device registers the terminal device from the source core network control plane device.
  • the source core network control plane device determines that the first NSSAI cannot be determined, the source core network control plane device cannot directly provide the service to the terminal device, and the source core network control plane device and the terminal device have isolation requirements.
  • the terminal device can be directly registered from the source core network control plane device, thereby preventing the terminal device from accessing the source network slice through the source core network control plane device, isolating the source network slice and the terminal device, and improving network slice security.
  • the terminal device sends a third registration request message to the access network device according to the third NSSAI and the first indication information, where the third registration request message carries the third NSSAI and the permanent identifier of the terminal device.
  • the terminal device carries the permanent identifier of the terminal device and the third NSSAI in the NAS message
  • the RRC message carries the third NSSAI and the PLMN selected by the terminal device.
  • the access network device selects a default core network control plane device for the terminal device according to the third NSSAI and the PLMN carried in the RRC message.
  • the default core network control plane device receives a third registration request message from the access network device.
  • the terminal device sends a third registration request message to the access network device according to the received third NSSAI.
  • the access network device determines a specific default core network control plane device for the terminal device according to the third NSSAI, and forwards the third registration request message to the default core network control plane device.
  • the third registration request message carries the third NSSAI and the permanent identifier of the terminal device.
  • the default core network control plane device obtains subscription data of the terminal device from the user data management center device according to the permanent identifier.
  • the default core network control plane device sends the permanent identifier of the terminal device to the user data management center device, and receives the subscription data of the terminal device returned by the user data management center device.
  • the default core network control plane device determines the target core network control plane device of the terminal device according to the subscription data.
  • the default core network control plane device determines the first NSSAI of the terminal device according to the subscription data, and determines the target core network control plane device according to the first NSSAI and the PLMN selected by the terminal device.
  • the default core network control plane device redirects the terminal device to the target core network control plane device.
  • the default core network control plane device After determining the target core network control plane device, the default core network control plane device redirects the terminal device to the target core network control plane device.
  • the process of redirecting the terminal device to the target core network control plane device by using the default core network control plane device includes at least the following two possible implementation manners:
  • the default core network control plane device sends a first redirection indication message to the access network device, where the first redirection indication message is used to trigger the access network device to redirect the terminal device to the target core network control plane device.
  • the default core network control plane device sends a first redirection indication message to the access network device, where the first redirection indication message carries the first NSSAI of the terminal device, the identification information of the target core network control plane device, and the terminal device Permanent identification.
  • the access network device selects the target core network control plane device according to the identifier information of the target core network control plane device carried in the first redirection indication message, and forwards the permanent identifier of the terminal device.
  • the core network control plane device enables the target core network control plane device to complete the redirection of the terminal device.
  • the default core network control plane device sends a second redirection indication message to the target core network control plane device, where the second redirection indication message is used to trigger the target core network control plane device to complete the redirection of the terminal device.
  • the default core network control plane directly sends a second redirection indication message to the target core network control plane device according to the identifier information of the target core network control plane device, where the second redirection indication message carries the first NSSAI of the terminal device and the terminal.
  • the permanent identification of the device causes the target core network control plane device to complete the redirection of the terminal device.
  • the present invention further provides a core network control plane device and a terminal device, which are used to perform the foregoing method for selecting a core network control plane device according to the embodiment shown in FIG. 2 to FIG. 5, and have the same technical features and technical effects. The application will not go into details here.
  • FIG. 6 is a schematic structural diagram of a control device of a core network according to an embodiment of the present disclosure.
  • the core network control plane device may be the source core network control plane device in the foregoing embodiment shown in FIG. 2 to FIG. 4, and the core network control plane device may be implemented by software, hardware or a combination of software and hardware. As shown in Figure 6, it includes:
  • the obtaining module 601 is configured to acquire first network slice selection assistance information of the terminal device, where
  • the sending module 602 is configured to: if the source core network control plane device cannot determine the target core network control plane device indexed by the first network slice selection auxiliary information, the source core network control plane device sends the target core network control plane device to the terminal device.
  • the first network slice selects the auxiliary information and the first indication information to trigger the terminal device to send a first registration request message, where the first indication information is used to indicate that the temporary identifier of the terminal device is invalid,
  • the first registration request message carries the first network slice selection assistance information and a permanent identifier of the terminal device.
  • FIG. 7 is a schematic structural diagram of a core network control plane device according to another embodiment of the present application.
  • the core network control plane device further includes:
  • the temporary identifier setting module 603 is configured to set the temporary identifier of the terminal device to be invalid.
  • the obtaining module 601 is specifically configured to:
  • the first network slice selection assistance information is determined according to the subscription data.
  • the obtaining module 601 is specifically configured to:
  • the core network control plane device further includes:
  • the service detecting module 604 is configured to determine, according to the first network slice selection auxiliary information, that the source core network control plane device cannot continue to serve the terminal device.
  • the core network control plane device further includes:
  • the receiving module 605 is configured to receive, by the terminal device, a second registration request message, where the second registration request message carries the second network slice selection auxiliary information, where the second network slice selection auxiliary information is used to index the source core network control plane device;
  • the service detecting module 604 is specifically configured to determine that a slice type or a service type associated with the first network slice selection auxiliary information is not within a slice type or a service type range associated with the second network slice selection auxiliary information, and then determine The source core network control plane device cannot continue to serve the terminal device.
  • the core network control plane device further includes:
  • the target core network control plane device obtaining module 606 is configured to send the first network slice selection assistance information to the default core network control plane device to request the target core network control plane indexed by the first network slice selection auxiliary information. device;
  • the source core network control plane device cannot determine the target core network control plane device indexed by the first network slice selection assistance information.
  • the core network control plane device further includes:
  • the de-registration module 607 is configured to register the terminal device from the source core network control plane device.
  • the de-registration module 607 is specifically configured to delete the context information of the terminal device stored by the source core network control plane device.
  • FIG. 8 is a schematic structural diagram of a terminal device according to an embodiment of the present disclosure.
  • the terminal device may be the terminal device in the embodiment shown in FIG. 2 to FIG. 4, and the terminal device may be implemented by software, hardware or a combination of software and hardware. As shown in Figure 8, it includes:
  • the receiving module 801 is configured to receive first network slice selection assistance information and first indication information from the source core network control plane device, where the first network slice selection auxiliary information is used to index the target core network control plane device, where the first indication information is used. Indicating that the temporary identifier of the terminal device is invalid;
  • the sending module 802 is configured to send, according to the first network slice selection auxiliary information and the first indication information, a first registration request message to the access network device;
  • the first registration request message carries the first network slice selection auxiliary information and the permanent identifier of the terminal device.
  • FIG. 9 is a schematic structural diagram of a control device of a core network according to an embodiment of the present disclosure.
  • the core network control plane device may be the source core network control plane device in the foregoing embodiment shown in FIG. 5, and the core network control plane device may be implemented by software, hardware or a combination of software and hardware. As shown in Figure 9, it includes:
  • the determining module 901 is configured to determine whether the first network slice selection auxiliary information can be determined, and the first network slice selection auxiliary information is used to index the target core network control plane device;
  • the sending module 902 is configured to: if the source core network control plane device cannot determine the first network slice selection auxiliary information, send the third network slice selection auxiliary information and the first indication information to the terminal device, to trigger the terminal device to send the first a third registration request message, where the first indication information is used to indicate that the temporary identifier of the terminal device is invalid, the third network slice selection auxiliary information is used to index the default core network control plane device, and the third registration request message carries the third network slice selection Auxiliary information and permanent identification of the terminal device.
  • it also includes:
  • the temporary identifier setting module 903 is configured to set the temporary identifier of the terminal device to be invalid when the first network slice selection auxiliary information cannot be determined.
  • it also includes:
  • the deregistration module 904 is configured to register the terminal device from the source core network control panel device.
  • FIG. 10 is a schematic structural diagram of a terminal device according to an embodiment of the present disclosure.
  • the terminal device may be the terminal device in the embodiment shown in FIG. 5, and the terminal device may be implemented by software, hardware or a combination of software and hardware. As shown in Figure 10, it includes:
  • the receiving module 1001 is configured to receive, by the source core network control plane device, third network slice selection assistance information and first indication information, where the third network slice selection auxiliary information is used to index the default core network control plane device, where the first indication information is used.
  • the temporary identifier indicating the terminal device is invalid;
  • the sending module 1002 is configured to send, according to the third network slice selection auxiliary information and the first indication information, a third registration request message to the access network device;
  • the third registration request message carries the third network slice selection auxiliary information and the permanent identifier of the terminal device.
  • FIG. 11 is a schematic structural diagram of a control device of a core network according to an embodiment of the present disclosure.
  • the core network control plane device may be the default core network control plane device in the foregoing embodiment shown in FIG. 5, and the core network control plane device may be implemented by software, hardware, or a combination of software and hardware. As shown in Figure 11, it includes:
  • the receiving module 1101 is configured to receive, by the access network device, a third registration request message, where the third registration request message carries a permanent identifier of the terminal device;
  • the subscription data obtaining module 1102 is configured to acquire subscription data of the terminal device from the user data management center device according to the permanent identifier;
  • the target core network control plane device acquiring module 1103 is configured to determine, according to the subscription data, a target core network control plane device of the terminal device;
  • the redirection module 1104 is configured to redirect the terminal device to the target core network control plane device.
  • the redirecting module 1104 further includes:
  • the sending unit 1105 is configured to send a first redirection indication message to the access network device, where the first redirection indication message is used to trigger the access network device to redirect the terminal device to the target core network control plane device; or, to the target core
  • the network control plane device sends a second redirection indication message, where the second redirection indication message is used to trigger the target core network control plane device to complete redirection of the terminal device.
  • the present invention further provides a core network control plane device and a terminal device, which are used to perform the foregoing method for selecting a core network control plane device according to the embodiment shown in FIG. 2 to FIG. 5, and have the same technical features and technical effects. The application will not go into details here.
  • FIG. 12 is a schematic structural diagram of a control device of a core network according to an embodiment of the present disclosure.
  • the core network control plane device may be the source core network control plane device in the embodiment shown in FIG. 2 to FIG. 4, as shown in FIG. 12, including:
  • the processor 1201 is configured to acquire first network slice selection assistance information of the terminal device, where
  • the transmitter 1202 is configured to: if the first core network control plane device cannot determine the second core network control plane device indexed by the first network slice selection assistance information, the first core network control plane device is configured to The terminal device sends the first network slice selection assistance information and the first indication information to trigger the terminal device to send a first registration request message, where the first indication information is used to indicate that the temporary identifier of the terminal device is invalid.
  • the first registration request message carries the first network slice selection assistance information and a permanent identifier of the terminal device.
  • the processor 1201 is further configured to set the temporary identifier of the terminal device to be invalid.
  • the processor 1201 is specifically configured to:
  • the first network slice selection assistance information is determined according to the subscription data.
  • the processor 1201 is specifically configured to acquire subscription data of the terminal device from the user data management center device;
  • the transmitter is further configured to send the subscription data to the third core network control plane device to request the first network slice selection auxiliary information of the terminal device;
  • the first core network control plane device further includes: a receiver 1203;
  • the receiver is configured to receive first network slice selection assistance information from a third core network control plane device.
  • the processor 1201 is specifically configured to:
  • the receiver 1203 is further configured to:
  • the processor 1201 is further configured to:
  • the transmitter 1202 is further configured to:
  • the processor 1201 is further configured to: if the request fails, confirm that the first core network control plane device cannot determine the second core network control plane device that is indexed by the first network slice selection assistance information.
  • the processor 1201 is further configured to:
  • the terminal device is registered from the first core network control plane device.
  • the processor 1201 is further configured to:
  • FIG. 13 is a schematic structural diagram of a terminal device according to an embodiment of the present disclosure.
  • the terminal device may be the terminal device in the embodiment shown in FIG. 2 to FIG. 4, as shown in FIG.
  • the receiver 1301 is configured to receive first network slice selection assistance information and first indication information from the first core network control plane device, where the first network slice selection assistance information is used to index the second core network control plane device, the first indication information Used to indicate that the temporary identifier of the terminal device is invalid;
  • the transmitter 1302 is configured to send, according to the first network slice selection auxiliary information and the first indication information, a first registration request message to the access network device;
  • the first registration request message carries the first network slice selection auxiliary information and the permanent identifier of the terminal device.
  • FIG. 14 is a schematic structural diagram of a control device of a core network according to an embodiment of the present disclosure.
  • the core network control plane device may be the source core network control plane device in the embodiment shown in FIG. 5, as shown in FIG.
  • the processor 1401 is configured to determine whether the first network slice selection auxiliary information can be determined, where the first network slice selection auxiliary information is used to index the fifth core network control plane device;
  • the transmitter 1402 is configured to: if the source core network control plane device cannot determine the first network slice selection assistance information, send the third network slice selection assistance information and the first indication information to the terminal device, to trigger the terminal device to send the a third registration request message, wherein the first indication information is used to indicate that the temporary identifier of the terminal device is invalid, the third network slice selection auxiliary information is used to index the sixth network control plane device, and the third registration request message carries the third network slice selection Auxiliary information and permanent identification of the terminal device.
  • the processor 1401 is further configured to set the temporary identifier of the terminal device to be invalid.
  • the processor 1401 is further configured to: register the terminal device from the fourth core network control plane device.
  • FIG. 15 is a schematic structural diagram of a terminal device according to an embodiment of the present disclosure.
  • the terminal device may be the terminal device in the embodiment shown in FIG. 5, as shown in FIG.
  • the receiver 1501 is configured to receive third network slice selection assistance information and first indication information from the fourth core network control plane device, where the third network slice selection assistance information is used to index the sixth core network control plane device, the first indication information Used to indicate that the temporary identifier of the terminal device is invalid;
  • the transmitter 1502 is configured to send, according to the third network slice selection auxiliary information and the first indication information, a third registration request message to the access network device;
  • the third registration request message carries the third network slice selection auxiliary information and the permanent identifier of the terminal device.
  • FIG. 16 is a schematic structural diagram of a control device of a core network according to an embodiment of the present disclosure.
  • the core network control plane device may be the default core network control plane device in the embodiment shown in FIG. 5, as shown in FIG. 16, including:
  • the receiver 1601 is configured to receive, by the access network device, a third registration request message, where the third registration request message carries a permanent identifier of the terminal device;
  • the processor 1602 is configured to acquire subscription data of the terminal device from the user data management center device according to the permanent identifier
  • the processor 1602 is further configured to determine, according to the subscription data, a fifth core network control plane device of the terminal device;
  • the processor 1602 is further configured to redirect the terminal device to the fifth core network control plane device.
  • the core network control plane device further includes:
  • the sender 1603 is configured to send a first redirection indication message to the access network device, where the first redirection indication message is used to trigger the access network device to redirect the terminal device to the fifth core network control plane device; or
  • each module of the core network control plane device and the terminal device is only a division of logic functions, and the actual implementation may have another division manner, for example, multiple units or components may be combined. Or it can be integrated into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of hardware plus software functional units.
  • the embodiment of the present application further provides a program for executing the method of the source core network control plane device side in the embodiment shown in FIG. 2 to FIG. 4 when executed by the processor.
  • the embodiment of the present application also provides a program product, such as a computer readable storage medium, including the program as described above.
  • the embodiment of the present application further provides a computer readable storage medium, where the computer readable storage medium stores instructions, when executed on a computer, causing the computer to execute the source core in the embodiment shown in FIG. 2 to FIG. Method method on the side of the network control plane device.
  • the embodiment of the present application further provides a program for executing the method on the terminal device side in the embodiment shown in FIG. 2 to FIG. 4 when executed by the processor.
  • the embodiment of the present application also provides a program product, such as a computer readable storage medium, including the program as described above.
  • the embodiment of the present application further provides a computer readable storage medium, where the computer readable storage medium stores instructions, when executed on a computer, causing the computer to execute the terminal device in the embodiment shown in FIG. 2 to FIG. Side method.
  • the application embodiment further provides a program for executing the method of the default core network control plane device side in the embodiment shown in FIG. 2 to FIG. 4 when executed by the processor.
  • the embodiment of the present application also provides a program product, such as a computer readable storage medium, including the program as described above.
  • the embodiment of the present application further provides a computer readable storage medium, where the computer readable storage medium stores instructions, when executed on a computer, causing the computer to execute the default in the embodiment shown in FIG. 2 to FIG. 4 above.
  • the method of the core network control plane device side is a program for executing the method of the default core network control plane device side in the embodiment shown in FIG. 2 to FIG. 4 when executed by the processor.
  • the embodiment of the present application also provides a program product, such as a computer readable storage medium, including the program as described above.
  • the embodiment of the present application further provides a computer readable storage medium, where the computer readable storage medium stores instructions, when executed on a computer, causing the computer to execute the default in the
  • the application embodiment also provides a program for executing the method of the source core network control plane device side in the embodiment shown in Fig. 5 when executed by the processor.
  • the embodiment of the present application also provides a program product, such as a computer readable storage medium, including the program as described above.
  • the embodiment of the present application further provides a computer readable storage medium, where the computer readable storage medium stores instructions, when executed on a computer, causing the computer to execute the control plane of the source core network in the embodiment shown in FIG. 5 Device side method.
  • the application embodiment also provides a program for executing the method on the terminal device side in the embodiment shown in Fig. 5 when executed by the processor.
  • the embodiment of the present application also provides a program product, such as a computer readable storage medium, including the program as described above.
  • the embodiment of the present application further provides a computer readable storage medium, where the computer readable storage medium stores instructions, when it is run on a computer, causing the computer to execute the method on the terminal device side in the embodiment shown in FIG. 5 .
  • the application embodiment further provides a program for executing the method of the default core network control plane device side in the embodiment shown in FIG. 5 when executed by the processor.
  • the embodiment of the present application also provides a program product, such as a computer readable storage medium, including the program as described above.
  • the embodiment of the present application further provides a computer readable storage medium, where the computer readable storage medium stores instructions, when executed on a computer, causes the computer to execute the default core network control in the embodiment shown in FIG. 5 The method on the side of the device.

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Abstract

本申请提供一种核心网控制面设备选择方法和装置。该方法包括：源核心网控制面设备获取终端设备的第一网络切片选择辅助信息，若源核心网控制面设备无法确定第一网络切片选择辅助信息所索引的目标核心网控制面设备，源核心网控制面设备向终端设备发送第一网络切片选择辅助信息以及第一指示信息，以触发终端设备发送第一注册请求消息，其中，第一指示信息用于指示终端设备的临时标识无效，第一注册请求消息携带第一网络切片选择辅助信息和终端设备的永久标识。本申请提供的核心网控制面设备选择方法，提高了网络切片安全性和终端设备的重定向流程效率，节约了信令。

Description

核心网控制面设备选择方法和装置
本申请要求于2017年03月17日提交中国专利局、申请号为201710162069.8、申请名称为“核心网控制面设备选择方法和装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信领域，尤其涉及一种核心网控制面设备选择方法和装置。
背景技术
网络切片技术是一种利用虚拟网络功能(Virtual Network Function，VNF)，在同一网络基础设施上提供多种虚拟逻辑网络切片的技术，不同种类的网络切片在功能、性能、安全、运维等方面具有不同的网络特征，使得不同用户设备可以按照各自的需求接入不同的网络切片，保障了不同业务的服务质量需求。
用户设备需通过注册在管理设备上以接入到网络切片中。通常根据用户设备的签约数据确定用户设备接入的源网络切片以及注册的源管理设备。当用户设备的签约数据发生变化时，可能存在用户设备接入的源网络切片无法满足用户设备的需求的情况。此时需根据用户设备更新的签约数据，触发用户设备发起重定向流程，以重定向到新网络切片中的新管理设备上。
终端设备在上述重定向过程中，源管理设备可以根据签约数据确定目标网络切片的目标管理设备，由于源管理设备存储有终端设备的上下文信息，新管理设备可以向源管理设备请求获取终端设备的上下文。但是当源网络切片和新网络切片之间具有隔离性需求时，会出现源网络切片无法根据签约数据确定目标网络切片的情况，在这种情况下，若终端设备仍采用上述重定向方法，则存在新管理设备访问源管理设备以获取终端设备的上下文的现象，影响了源网络切片和新网络切片之间的隔离性，降低了网络切片的安全。
发明内容
本申请提供一种核心网控制面设备选择方法和装置，用于解决现有终端设备在重定向过程中，影响了网络切片的安全性的问题。
第一方面，本申请提供一种核心网控制面设备选择方法，包括：
源核心网控制面设备获取终端设备的第一网络切片选择辅助信息，
若所述源核心网控制面设备无法确定所述第一网络切片选择辅助信息所索引的目标核心网控制面设备，所述源核心网控制面设备向所述终端设备发送所述第一网络切片选择辅助信息以及第一指示信息，以触发所述终端设备发送第一注册请求消息，其中，所述第一指示信息用于指示所述终端设备的临时标识无效，所述第一注册请求消息携带所述第一 网络切片选择辅助信息和所述终端设备的永久标识。
源核心网控制面设备在接收到指示目标核心网控制面设备的第一NSSAI，若无法确定第一NSSAI所索引的目标核心网控制面设备之后，源核心网控制面设备向终端设备发送用于指示终端设备的临时标识设置无效的第一指示信息，使得终端设备向接入网设备发送携带有第一NSSAI和终端设备的永久标识的注册请求消息，从而避免了目标核心网设备在接收到临时标识后，向源核心网控制面设备请求终端设备的上下文信息，杜绝了源核心网控制面设备和目标核心网控制面设备之间的信息交互，提高了网络切片之间的安全性，也提高了终端设备重定向到目标核心网控制面的流程效率，节约了信令。
在一种可能的实施方式中，源核心网控制面设备获知源核心网控制面设备与目标核心网控制面设备之间需要隔离之后，方法还包括：
所述源核心网控制面设备将所述终端设备的临时标识设置为无效。
由于源核心网控制面设备将终端设备的临时标识设置为无效，后续终端设备发起注册请求消息时，该注册请求消息中将不再携带终端设备的临时标识。避免了目标核心网控制面设备根据临时标识获取源核心网控制面设备的地址，并访问源核心网控制面设备以获取终端设备的上下文，从而提高了网络切片安全隔离性。
在一种可能的实施方式中，所述源核心网控制面设备获取终端设备的第一网络切片选择辅助信息，包括：
所述源核心网控制面设备从用户数据管理中心设备获取所述终端设备的签约数据；
所述源核心网控制面设备根据所述签约数据确定所述第一网络切片选择辅助信息。
源核心网控制面设备自身可根据终端设备的签约数据，获取第一NSSAI，消耗信令较少。
在一种可能的实施方式中，所述源核心网控制面设备获取终端设备的第一网络切片选择辅助信息，包括：
所述源核心网控制面设备从用户数据管理中心设备获取所述终端设备的签约数据；
所述源核心网控制面设备向缺省核心网控制面设备发送所述签约数据，以请求所述终端设备的第一网络切片选择辅助信息；
所述源核心网控制面设备从所述缺省核心网控制面设备接收所述第一网络切片选择辅助信息。
当源核心网控制面设备无法根据签约数据获取第一NSSAI时，源核心网控制面设备向缺省核心网控制面设备发送签约数据，以使缺省核心网控制面设备根据签约数据获取第一NSSAI，并将第一NSSAI发送给源核心网控制面设备。解决了当源核心网控制面设备无法根据签约数据获取第一NSSAI时，可能导致的终端设备重定向不成功的问题。
在一种可能的实施方式中，在所述源核心网控制面设备无法确定所述第一网络切片选择辅助信息所索引的目标核心网控制面设备之前，所述方法还包括：
所述源核心网控制面设备根据所述第一网络切片选择辅助信息判断所述源核心网控制面设备不能继续服务所述终端设备。
在一种可能的实施方式中，所述方法还包括：
所述源核心网控制面设备从所述终端设备接收第二注册请求消息，所述第二注册请求消息携带第二网络切片选择辅助信息，所述第二网络切片选择辅助信息用于索引所述源核 心网控制面设备。
在一种可能的实施方式中，所述源核心网控制面设备根据所述第一网络切片选择辅助信息判断所述源核心网控制面设备不能继续服务所述终端设备，包括：
所述源核心网控制面设备确定所述第一网络切片选择辅助信息所关联的切片类型或者业务类型不在所述第二网络切片选择辅助信息所关联的切片类型或者业务类型范围之内，则判断所述源核心网控制面设备不能继续服务所述终端设备。
在一种可能的实施方式中，所述源核心网控制面设备无法确定所述第一网络切片选择辅助信息所索引的目标核心网控制面设备，包括：
所述源核心网控制面设备向缺省核心网控制面设备发送所述第一网络切片选择辅助信息，以请求所述第一网络切片选择辅助信息所索引的目标核心网控制面设备；
若请求失败，所述源核心网控制面设备无法确定第一网络切片选择辅助信息所索引的目标核心网控制面设备。
在一种可能的实施方式中，所述源核心网控制面设备向所述终端设备发送所述第一网络切片选择辅助信息以及第一指示信息之后，所述方法还包括：
所述源核心网控制面设备将所述终端设备从所述源核心网控制面设备去注册。
将终端设备从源核心网控制面设备去注册，使得源核心网控制面设备不再为终端设备提供服务，避免了不同网络切片间的业务交互，提高了安全性。
在一种可能的实施方式中，所述源核心网控制面设备将所述终端设备从所述源核心网控制面设备去注册，包括：
所述源核心网控制面设备删除所述源核心网控制面设备存储的所述终端设备的上下文信息。
第二方面，本申请提供一种核心网控制面设备选择方法，为与上述第一方面提供的核心网控制面设备选择方法相对应的终端设备侧的方法，包括：
终端设备从源核心网控制面设备接收第一网络切片选择辅助信息和第一指示信息，所述第一网络切片选择辅助信息用于索引目标核心网控制面设备，所述第一指示信息用于指示所述终端设备的临时标识无效；
所述终端设备根据所述第一网络切片选择辅助信息和所述第一指示信息，向接入网设备发送第一注册请求消息；
其中，所述第一注册请求消息携带所述第一网络切片选择辅助信息和所述终端设备的永久标识。
第三方面，本申请提供一种核心网控制面设备选择方法，包括：
源核心网控制面设备判断是否能确定第一网络切片选择辅助信息，所述第一网络切片选择辅助信息用于索引目标核心网控制面设备；
若所述源核心网控制面设备无法确定所述第一网络切片选择辅助信息，所述源核心网控制面设备向所述终端设备发送第三网络切片选择辅助信息以及第一指示信息，以触发所述终端设备发送第三注册请求消息，其中，所述第一指示信息用于指示所述终端设备的临时标识无效，所述第三网络切片选择辅助信息用于索引缺省核心网控制面设备，所述第三注册请求消息携带所述第三网络切片选择辅助信息和所述终端设备的永久标识。
在一种可能的实施方式中，所述源核心网控制面设备向所述终端设备发送第三网络切 片选择辅助信息以及第一指示信息之后，所述方法还包括：
所述源核心网控制面设备将所述终端设备的临时标识设置为无效。
在一种可能的实施方式中，所述源核心网控制面设备向所述终端设备发送第三网络切片选择辅助信息以及第一指示信息之后，所述方法还包括：
所述源核心网控制面设备将所述终端设备从所述源核心网控制面设备去注册。
第四方面，本申请提供一种核心网控制面设备选择方法，为与上述第三方面提供的核心网控制面设备选择方法相对应的终端设备侧的方法，包括：
终端设备从源核心网控制面设备接收第三网络切片选择辅助信息和第一指示信息，所述第三网络切片选择辅助信息用于索引缺省核心网控制面设备，所述第一指示信息用于指示所述终端设备的临时标识无效；
所述终端设备根据所述第三网络切片选择辅助信息和所述第一指示信息，向接入网设备发送第三注册请求消息；
其中，所述第三注册请求消息携带所述第三网络切片选择辅助信息和所述终端设备的永久标识。
第五方面，本申请提供一种核心网控制面设备选择方法，为与上述第三方面提供的核心网控制面设备选择方法相对应的缺省核心网控制面设备侧的方法，包括：
缺省核心网控制面设备从接入网设备接收第三注册请求消息，所述第三注册请求消息携带所述终端设备的永久标识；
所述缺省核心网控制面设备根据所述永久标识向用户数据管理中心设备获取所述终端设备的签约数据；
所述缺省核心网控制面设备根据所述签约数据确定所述终端设备的目标核心网控制面设备；
所述缺省核心网控制面设备将所述终端设备重定向至所述目标核心网控制面设备。
在一种可能的实施方式中，所述缺省核心网控制面设备将所述终端设备重定向至所述目标核心网控制面设备，包括：
所述缺省核心网控制面设备向接入网设备发送第一重定向指示消息，所述第一重定向指示消息用于触发所述接入网设备将所述终端设备重定向至所述目标核心网控制面设备；或者，
所述缺省核心网控制面设备向所述目标核心网控制面设备发送第二重定向指示消息，所述第二重定向指示消息用于触发所述目标核心网控制面设备完成所述终端设备的重定向。
本申请第六方面至第十方面还提供一种核心网控制面设备和终端设备，分别用于执行上述第一至第五方面的核心网控制面设备选择方法，具有相同的技术特征和技术效果，本申请对此不再赘述。
第六方面，本申请提供一种核心网控制面设备，作为源核心网控制面设备，用于执行上述第一方面的核心网控制面设备选择方法，包括：
获取模块，用于获取终端设备的第一网络切片选择辅助信息，
发送模块，用于若所述源核心网控制面设备无法确定所述第一网络切片选择辅助信息所索引的目标核心网控制面设备，所述源核心网控制面设备向所述终端设备发送所述第一 网络切片选择辅助信息以及第一指示信息，以触发所述终端设备发送第一注册请求消息，其中，所述第一指示信息用于指示所述终端设备的临时标识无效，所述第一注册请求消息携带所述第一网络切片选择辅助信息和所述终端设备的永久标识。
在一种可能的实施方式中，核心网控制面设备还包括：
临时标识设置模块，用于将终端设备的临时标识设置为无效。
在一种可能的实施方式中，所述获取模块具体用于，
从用户数据管理中心设备获取所述终端设备的签约数据；
根据所述签约数据确定所述第一网络切片选择辅助信息。
在一种可能的实施方式中，所述获取模块具体用于，
从用户数据管理中心设备获取所述终端设备的签约数据；
向缺省核心网控制面设备发送所述签约数据，以请求所述终端设备的第一网络切片选择辅助信息；
从所述缺省核心网控制面设备接收所述第一网络切片选择辅助信息。
在一种可能的实施方式中，所述核心网控制面设备还包括：
服务检测模块，用于根据所述第一网络切片选择辅助信息判断所述源核心网控制面设备不能继续服务所述终端设备。
在一种可能的实施方式中，所述核心网控制面设备还包括：
接收模块，用于从所述终端设备接收第二注册请求消息，所述第二注册请求消息携带第二网络切片选择辅助信息，所述第二网络切片选择辅助信息用于索引所述源核心网控制面设备；
所述服务检测模块，具体用于确定所述第一网络切片选择辅助信息所关联的切片类型或者业务类型不在所述第二网络切片选择辅助信息所关联的切片类型或者业务类型范围之内，则判断所述源核心网控制面设备不能继续服务所述终端设备。
在一种可能的实施方式中，所述核心网控制面设备还包括：
目标核心网控制面设备获取模块，用于向缺省核心网控制面设备发送所述第一网络切片选择辅助信息，以请求所述第一网络切片选择辅助信息所索引的目标核心网控制面设备；
若请求失败，则确认所述源核心网控制面设备无法确定第一网络切片选择辅助信息所索引的目标核心网控制面设备。
在一种可能的实施方式中，所述核心网控制面设备还包括：
去注册模块，用于将终端设备从源核心网控制面设备去注册。
在一种可能的实施方式中，所述去注册模块具体用于，删除所述源核心网控制面设备存储的所述终端设备的上下文信息。
第七方面，本申请提供一种终端设备，用于执行上述第二方面的核心网控制面设备选择方法，包括：
接收模块，用于从源核心网控制面设备接收第一网络切片选择辅助信息和第一指示信息，所述第一网络切片选择辅助信息用于索引目标核心网控制面设备，所述第一指示信息用于指示所述终端设备的临时标识无效；
发送模块，用于根据所述第一网络切片选择辅助信息和所述第一指示信息，向接入网设备发送第一注册请求消息；
其中，所述第一注册请求消息携带所述第一网络切片选择辅助信息和所述终端设备的永久标识。
第八方面，本申请提供一种核心网控制面设备，作为源核心网控制面板设备，用于执行上述第三方面的核心网控制面设备选择方法，包括：
判断模块，用于判断是否能确定第一网络切片选择辅助信息，所述第一网络切片选择辅助信息用于索引目标核心网控制面设备；
发送模块，用于若所述源核心网控制面设备无法确定所述第一网络切片选择辅助信息，向所述终端设备发送第三网络切片选择辅助信息以及第一指示信息，以触发所述终端设备发送第三注册请求消息，其中，所述第一指示信息用于指示所述终端设备的临时标识无效，所述第三网络切片选择辅助信息用于索引缺省核心网控制面设备，所述第三注册请求消息携带所述第三网络切片选择辅助信息和所述终端设备的永久标识。
在一种可能的实施方式中，还包括：
临时标识设置模块，用于将所述终端设备的临时标识设置为无效。
在一种可能的实施方式中，还包括：
去注册模块，用于将所述终端设备从所述源核心网控制面设备去注册。
第九方面，本申请提供一种终端设备，用于执行上述第四方面的核心网控制面设备选择方法，包括：
接收模块，用于从源核心网控制面设备接收第三网络切片选择辅助信息和第一指示信息，所述第三网络切片选择辅助信息用于索引缺省核心网控制面设备，所述第一指示信息用于指示所述终端设备的临时标识无效；
发送模块，用于根据所述第三网络切片选择辅助信息和所述第一指示信息，向接入网设备发送第三注册请求消息；
其中，所述第三注册请求消息携带所述第三网络切片选择辅助信息和所述终端设备的永久标识。
第十方面，本申请提供一种核心网控制面设备，作为缺省核心网控制面板设备，用于执行上述第五方面的核心网控制面设备选择方法，包括：
接收模块，用于从接入网设备接收第三注册请求消息，所述第三注册请求消息携带所述终端设备的永久标识；
签约数据获取模块，用于根据所述永久标识向用户数据管理中心设备获取所述终端设备的签约数据；
目标核心网控制面设备获取模块，用于根据所述签约数据确定所述终端设备的目标核心网控制面设备；
重定向模块，用于将终端设备重定向至目标核心网控制面设备。
在一种可能的实施方式中，重定向模块还包括：
发送单元，用于向接入网设备发送第一重定向指示消息，第一重定向指示消息用于触发接入网设备将终端设备重定向至目标核心网控制面设备；或者，向目标核心网控制面设备发送第二重定向指示消息，第二重定向指示消息用于触发目标核心网控制面设备完成终端设备的重定向。
本申请还提供一种核心网控制面设备、接入网设备、终端设备，用于执行上述第一至 第五方面的核心网控制面设备选择方法，具有相同的技术特征和技术效果，本申请对此不再赘述。
第十一方面，本申请提供一种核心网控制面设备，作为第一核心网控制面板设备，用于执行上述第一方面的核心网控制面设备选择方法，包括：
处理器，用于获取终端设备的第一网络切片选择辅助信息，
发送器，用于若所述第一核心网控制面设备无法确定所述第一网络切片选择辅助信息所索引的第二核心网控制面设备，所述第一核心网控制面设备向所述终端设备发送所述第一网络切片选择辅助信息以及第一指示信息，以触发所述终端设备发送第一注册请求消息，其中，所述第一指示信息用于指示所述终端设备的临时标识无效，所述第一注册请求消息携带所述第一网络切片选择辅助信息和所述终端设备的永久标识。
在一种可能的实施方式中，所述处理器还用于，将终端设备的临时标识设置为无效。
在一种可能的实施方式中，所述处理器具体用于，
从用户数据管理中心设备获取终端设备的签约数据；
根据签约数据确定第一网络切片选择辅助信息。
在一种可能的实施方式中，所述处理器具体用于，从用户数据管理中心设备获取终端设备的签约数据；
所述发送器还用于，向第三核心网控制面设备发送签约数据，以请求终端设备的第一网络切片选择辅助信息；
所述第一核心网控制面设备还包括：接收器；
所述接收器，用于从第三核心网控制面设备接收第一网络切片选择辅助信息。
在一种可能的实施方式中，所述处理器具体用于，
根据所述第一网络切片选择辅助信息判断所述第一核心网控制面设备不能继续服务所述终端设备。
在一种可能的实施方式中，所述接收器还用于，
从所述终端设备接收第二注册请求消息，所述第二注册请求消息携带第二网络切片选择辅助信息，所述第二网络切片选择辅助信息用于索引所述第一核心网控制面设备。
在一种可能的实施方式中，所述处理器还用于，
在确定第一网络切片选择辅助信息所关联的切片类型或者业务类型不在第二网络切片选择辅助信息所关联的切片类型或者业务类型范围之内时，判断第一核心网控制面设备不能继续服务终端设备。
在一种可能的实施方式中，所述发送器还用于，
向第三核心网控制面设备发送所述第一网络切片选择辅助信息，以请求所述第一网络切片选择辅助信息所索引的第二核心网控制面设备；
所述处理器还用于，若请求失败，则确认所述第一核心网控制面设备无法确定第一网络切片选择辅助信息所索引的第二核心网控制面设备。
在一种可能的实施方式中，所述处理器还用于，
将终端设备从第一核心网控制面设备去注册。
在一种可能的实施方式中，所述处理器具体用于，删除所述第一核心网控制面设备存储的所述终端设备的上下文信息。
第十二方面，本申请提供一种终端设备，用于执行上述第二方面的核心网控制面设备选择方法，包括：
接收器，用于从第一核心网控制面设备接收第一网络切片选择辅助信息和第一指示信息，第一网络切片选择辅助信息用于索引第二核心网控制面设备，第一指示信息用于指示终端设备的临时标识无效；
发送器，用于根据第一网络切片选择辅助信息和第一指示信息，向接入网设备发送第一注册请求消息；
其中，第一注册请求消息携带第一网络切片选择辅助信息和终端设备的永久标识。
第十三方面，本申请提供一种核心网控制面设备，作为第四核心网控制面板设备，用于执行上述第三方面的核心网控制面设备选择方法，包括：
处理器，用于判断是否能确定第一网络切片选择辅助信息，第一网络切片选择辅助信息用于索引第五核心网控制面设备；
发送器，用于若第四核心网控制面设备无法确定所述第一网络切片选择辅助信息，向终端设备发送第三网络切片选择辅助信息以及第一指示信息，以触发终端设备发送第三注册请求消息，其中，第一指示信息用于指示终端设备的临时标识无效，第三网络切片选择辅助信息用于索引第六心网控制面设备，第三注册请求消息携带第三网络切片选择辅助信息和终端设备的永久标识。
在一种可能的实施方式中，处理器还用于，
将终端设备的临时标识设置为无效。
在一种可能的实施方式中，处理器还用于，将终端设备从第四核心网控制面设备去注册。
第十四方面，本申请提供一种终端设备，用于执行上述第四方面的核心网控制面设备选择方法，包括：
接收器，用于从第四核心网控制面设备接收第三网络切片选择辅助信息和第一指示信息，第三网络切片选择辅助信息用于索引第六核心网控制面设备，第一指示信息用于指示终端设备的临时标识无效；
发送器，用于根据第三网络切片选择辅助信息和第一指示信息，向接入网设备发送第三注册请求消息；
其中，第三注册请求消息携带第三网络切片选择辅助信息和终端设备的永久标识。
第十五方面，本申请提供一种核心网控制面设备，作为第六核心网控制面板设备，用于执行上述第五方面的核心网控制面设备选择方法，包括：
接收器，用于从接入网设备接收第三注册请求消息，第三注册请求消息携带终端设备的永久标识；
处理器，用于根据永久标识向用户数据管理中心设备获取终端设备的签约数据；
处理器还用于，根据签约数据确定终端设备的第五核心网控制面设备；
处理器还用于，将终端设备重定向至第五核心网控制面设备。
在一种可能的实施方式中，核心网控制面设备还包括：
发送器，用于向接入网设备发送第一重定向指示消息，第一重定向指示消息用于触发接入网设备将终端设备重定向至第五核心网控制面设备；或者，
向第五核心网控制面设备发送第二重定向指示消息，第二重定向指示消息用于触发第五核心网控制面设备完成终端设备的重定向。
第十六方面，本申请实施例提供一种程序，该程序在被处理器执行时用于执行上述第一方面的方法。
第十七方面，本申请实施例提供一种程序产品，例如计算机可读存储介质，包括第十六方面的程序。
第十八方面，本申请实施例提供一种计算机可读存储介质，所述计算机可读存储介质中存储有指令，当其在计算机上运行时，使得计算机执行上述第一方面的方法。
第十九方面，本申请实施例提供一种程序，该程序在被处理器执行时用于执行上述第二方面的方法。
第二十方面，本申请实施例提供一种程序产品，例如计算机可读存储介质，包括第十九方面的程序。
第二十一方面，本申请实施例提供一种计算机可读存储介质，所述计算机可读存储介质中存储有指令，当其在计算机上运行时，使得计算机执行上述第二方面的方法。
第二十二方面，本申请实施例提供一种程序，该程序在被处理器执行时用于执行上述第三方面的方法。
第二十三方面，本申请实施例提供一种程序产品，例如计算机可读存储介质，包括第二十二方面的程序。
第二十四方面，本申请实施例提供一种计算机可读存储介质，所述计算机可读存储介质中存储有指令，当其在计算机上运行时，使得计算机执行上述第三方面的方法。
第二十五方面，本申请实施例提供一种程序，该程序在被处理器执行时用于执行上述第四方面的方法。
第二十六方面，本申请实施例提供一种程序产品，例如计算机可读存储介质，包括第二十五方面的程序。
第二十七方面，本申请实施例提供一种计算机可读存储介质，所述计算机可读存储介质中存储有指令，当其在计算机上运行时，使得计算机执行上述第四方面的方法。
第二十八方面，本申请实施例提供一种程序，该程序在被处理器执行时用于执行上述第五方面的方法。
第二十九方面，本申请实施例提供一种程序产品，例如计算机可读存储介质，包括第二十八方面的程序。
第三十方面，本申请实施例提供一种计算机可读存储介质，所述计算机可读存储介质中存储有指令，当其在计算机上运行时，使得计算机执行上述第五方面的方法。
第三十一方面，本申请实施例提供一种程序，该程序在被处理器执行时用于执行上述第六方面的方法。
第三十二方面，本申请实施例提供一种程序产品，例如计算机可读存储介质，包括第三十一方面的程序。
第三十三方面，本申请实施例提供一种计算机可读存储介质，所述计算机可读存储介质中存储有指令，当其在计算机上运行时，使得计算机执行上述第六方面的方法。
附图说明
图1示出了本申请实施例可能适用的一种系统架构；
图2为本申请实施例提供的核心网控制面设备选择方法的信令交互图；
图3为本申请实施例提供的核心网控制面设备选择方法的信令交互图；
图4为本申请实施例提供的核心网控制面设备选择方法的信令交互图；
图5为本申请实施例提供的核心网控制面设备选择方法的信令交互图；
图6为本申请一实施例提供的核心网控制面设备的结构示意图；
图7为本申请另一实施例提供的核心网控制面设备的结构示意图；
图8为本申请一实施例提供的终端设备的结构示意图；
图9为本申请一实施例提供的核心网控制面设备的结构示意图；
图10为本申请一实施例提供的终端设备的结构示意图；
图11为本申请一实施例提供的核心网控制面设备的结构示意图；
图12为本申请一实施例提供的核心网控制面设备的结构示意图；
图13为本申请一实施例提供的终端设备的结构示意图；
图14为本申请一实施例提供的核心网控制面设备的结构示意图；
图15为本申请一实施例提供的终端设备的结构示意图；
图16为本申请一实施例提供的核心网控制面设备的结构示意图。
具体实施方式
本申请描述的网络架构以及业务场景是为了更加清楚的说明本申请的技术方案，并不构成对本申请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，本申请提供的技术方案对于类似的技术问题，同样适用。
下面结合图1对本申请实施例可能适用的系统架构进行介绍。图1示出了本申请实施例可能适用的一种系统架构。如图1所示，本实施例提供的系统架构包括至少一个终端设备、至少一个接入网设备、至少一个核心网控制面设备、至少一个缺省核心网控制面设备，以及至少一个用户数据管理中心设备。
在通信系统中，为适应不同的业务对网络性能不同的要求，网络需要具备按需制定的能力，需要能实现不同功能的网络切片。通信系统的发展趋势是通过虚拟化技术，为不同类型的业务建立不同的网络切片。每个网络切片可以看作是一个完整的网络，不同类型的业务所对应的网络切片可以采用不同的网络形态。例如，在数据面或信令面采用不同的协议栈结构，以更好地匹配业务的特征。网络切片在数据面进行划分，共享共同的控制面功能。网络切片由包括一组一个或多个网络功能和能运行这些网络功能的资源组成。
当核心网部署了网络切片，终端设备初始接入到网络时，就会触发网络切片的选择过程。网络切片的选择过程取决于终端设备的签约数据、本地配置信息、漫游协议、运营商的策略等等。终端设备可能接入一个或者多个网络切片，多个网络切片可以共享部分控制面功能，实现终端粒度的功能，如移动性管理等。当终端设备需要接入到某个网络切片时，终端设备可以提供网络切片选择辅助信息(Network Slice Selection Assistance Information，NSSAI)给核心网，用于核心网为终端设备选择网络切片实例。
其中，终端设备通过接入网设备与核心网进行通信。终端设备可以是无线终端或有线终端。无线终端可以是指向用户提供语音和/或其他业务数据连通性的设备，具有无线连接功能的手持式设备、或连接到无线调制解调器的其他处理设备。无线终端可以经无线接入网(Radio Access Network，RAN)与一个或多个核心网进行通信，无线终端可以是移动终端，如移动电话(或称为“蜂窝”电话)和具有移动终端的计算机，例如，可以是便携式、袖珍式、手持式、计算机内置的或者车载的移动装置，它们与无线接入网交换语言和/或数据。例如，个人通信业务(Personal Communication Service，简称PCS)电话、无绳电话、会话发起协议(Session Initiation Protocol，简称SIP)话机、无线本地环路(Wireless Local Loop，WLL)站、个人数字助理(Personal Digital Assistant，PDA)等设备。无线终端也可以称为系统、订户单元(Subscriber Unit)、订户站(Subscriber Station)，移动站(Mobile Station)、移动台(Mobile)、远程站(Remote Station)、远程终端(Remote Terminal)、接入终端(Access Terminal)、用户终端(User Terminal)、用户代理(User Agent)、站点设备(Station，STA)，在此不作限定。图1示意性的绘出了一种可能的示意，以该终端设备为移动电话为例进行了绘示。
其中，接入网设备是一种提供网络接入服务的设备，可允许终端设备通过接入网设备接入到无线网络中。终端设备通过接入网设备与核心网进行通信。接入网设备可以是全球移动通讯(Global System of Mobile communication，GSM)或码分多址(Code Division Multiple Access，CDMA)中的基站(Base Transceiver Station，简称BTS)，也可以是宽带码分多址(Wideband Code Division Multiple Access，WCDMA)中的基站(NodeB，NB)，还可以是长期演进(Long Term Evolution，LTE)中的演进型基站(Evolutional Node B，简称eNB或eNodeB)，或者中继站或接入点(Access Point，AP)，或无线接入网(Radio Access Network，RAN)，或者未来5G网络中的基站等，在此并不限定。图1示意性的绘出了一种可能的示意，以该接入网设备为基站为例进行了绘示。
其中，核心网控制面设备是一种为终端设备提供服务的设备，主要功能包括：移动性管理功能。例如，移动性管理功能包括移动状态管理功能、用户临时身份标识分配功能、认证和授权用户功能。一个核心网控制面设备与一个或多个网络切片关联，即，多个网络切片共享一个核心网控制面设备；终端设备通过注册在特定的核心网控制面设备来接入特定的网络切片。核心网控制面设备可以为接入和移动性管理功能(Access and Mobility Management Function，AMF)设备。
其中，用户数据管理中心设备用于存储终端设备的签约数据。例如，终端设备的签约数据包括移动管理相关的签约数据以及会话管理相关的签约数据。当终端设备的签约数据发生变化时，用户数据管理中心设备可将变化的签约数据发送给终端设备当前注册的核心网控制面设备。
其中，缺省核心网控制面设备为可以与任一核心网控制面设备通信的核心网控制面设备通信，且缺省核心网控制面设备与任一核心网控制面设备之间不存在安全隔离需求，即缺省核心网控制面设备与任一核心网控制面设备可以通信。。
结合图1，本申请实施例提供的核心网控制面设备选择方法可以应用于以下场景中：当终端设备需要进行的业务从第一种类型的业务更新为第二种类型的业务时，终端设备原本接入的网络切片1的性能已经无法满足第二种类型的业务需求，终端设备需要重定向至 网络切片3，即终端设备需要重定向至网络切片3的核心网控制面设备4。终端设备在重定向过程中，由于源管理设备(例如核心网控制面设备1)存储有终端设备的上下文信息，新管理设备(例如核心网控制面设备4)可以向源管理设备请求获取终端设备的上下文，但是当源网络切片无法确定目标网络切片时，源网络切片和新网络切片之间可能具有隔离性需求，若终端设备仍采用上述重定向方法，则存在新管理设备访问源管理设备以获取终端设备的上下文的现象，影响了源网络切片和新网络切片之间的隔离性，降低了网络切片的安全。
其中，终端设备发起的重定向流程中，终端设备可以发送携带终端设备临时标识的注册请求消息，目标核心网控制面设备根据终端设备的临时标识确定分配该临时标识的源核心网控制面设备的标识，并向源核心网控制面设备发送终端设备的临时标识，以向源核心网控制面设备请求存储的终端设备的上下文信息。但是，当源核心网控制面设备无法确定目标核心网控制面设备时，目标核心网控制面设备与源核心网控制面设备之间可能存在隔离性需要导致二者不能通信，这样会出现目标核心网控制面设备向源核心网控制面设备请求终端设备的上下文信息失败的情况，进而影响了终端设备的重定向。只能由终端设备再次发起携带终端设备永久标识的注册请求消息，以使目标核心网控制面设备向用户数据管理中心请求终端设备的签约数据以完成重定向。故在源核心网控制面设备与目标核心网控制面设备之间存在隔离性需求导致源核心网控制面设备无法确定目标核心网控制面设备时，上述重定向方式还存在重定向步骤复杂，信令开销较大的问题。
为解决上述问题，本申请第一方面提供一种核心网控制面设备选择方法，解决了源核心网控制面设备无法确定目标核心网控制面设备时，如何解决终端设备的重定向问题。下面采用详细的实施例，对本申请提供的核心网控制面设备选择方法进行详细说明。下面这几个具体的实施例可以相互结合，对于相同或相似的概念或过程可能在某些实施例不再赘述。
图2为本申请实施例提供的核心网控制面设备选择方法的信令交互图。如图2所示，本申请实施例提供的核心网控制面设备选择方法包括如下步骤：
S201、源核心网控制面设备获取终端设备的第一NSSAI，
例如，本申请实施例中的源核心网控制面设备为终端设备当前注册的核心网控制面设备，终端设备当前接入的网络切片为源网络切片。当终端设备的签约数据变化时，源核心网控制面设备根据签约数据获取终端设备的第一NSSAI。
其中，签约数据包含鉴权信息、签约业务接入点名称信息、接入点名称对应的服务等级信息、接入限制数据信息、漫游限制信息等。示例性的，签约数据发生变化，可以为签约数据中的任一项发生了变化。当终端设备的签约数据发生变化时，代表终端设备提出了新的网络性能需求，因而可能存在源网络切片无法满足终端设备的新的需求的情况，需要重新为终端设备选择合适的网络切片。
NSSAI可用于辅助核心网为终端设备选择合适的网络切片。示例性的，NSSAI可以是预设的标准化值或公用陆地移动网(Public Land Mobile Network，PLMN)内的特定值。NSSAI还可以是会话管理网络片选择辅助信息(Session Management-NSSAI，SM-NSSAI)的集合。
当终端设备的签约信息变化时，源核心网控制面设备可确定终端设备的新的签约信息 对应的NSSAI，根据NSSAI确定目标网络切片类型，进而可为终端设备确定与目标网络切片类型关联的目标核心网控制面设备。
或者，终端设备的新的签约信息包含了第一NSSAI，源核心网控制面设备从新的签约信息直接获取第一NSSAI。
S202、源核心网控制面设备无法确定第一NSSAI所索引的目标核心网控制面设备。
例如，不同的网络切片对安全等级的要求不同，为保证安全等级要求高的网络切片中数据的安全性，该网络切片与其他网络切片之间存在隔离性需求，即两个网络切片各自包含的设备之间无法通信。当两个网络切片之间存在安全隔离时，两个网络切片之间不存在共享的核心网控制面设备。且两个网络切片内部的核心网控制面设备之间均不能通信。
为避免具有隔离性需求的网络切片之间存在交互，本申请中源核心网控制面设备触发终端设备在发起重定向流程之前，源核心网控制面设备需根据第一NSSAI判断该第一NSSAI所索引的目标核心网控制面设备。如前所述，如果源网络切片和目标网络切片之间存在安全隔离时，源核心网控制面设备无法确定第一NSSAI所索引的目标核心网控制面设备。
S203、源核心网控制面设备向终端设备发送第一NSSAI和第一指示信息。
其中，第一指示信息用于指示终端设备的临时标识无效。可选的，参照图2，源核心网控制面设备可以通过接入网设备向终端设备发送第一NSSAI和第一指示信息。以下各实施例中的源核心网控制面设备与终端设备之间的信令交互，均可通过接入网设备，本申请不再赘述。
可选的，在S203之前，本申请实施还包括：
S2031、源核心网控制面设备将终端设备的临时标识设置为无效。
例如，当源核心网控制面设备无法确定第一NSSAI所索引的目标核心网控制面设备，源核心网控制面设备将终端设备的临时标识设置为无效。由于终端设备的临时标识设置为无效，后续终端设备发起注册请求消息时，该注册请求消息中将不再携带终端设备的临时标识，从而避免了目标核心网控制面设备根据临时标识获取源核心网控制面设备的地址，并访问源核心网控制面设备以获取终端设备的上下文，提高了网络切片安全隔离性。
可选的，在S203之后，本申请实施还包括：
S2032、源核心网控制面设备将终端设备从源核心网控制面设备去注册。例如，源核心网控制面设备删除源核心网控制面设备存储的终端设备的上下文信息，以将终端设备从源核心网控制面设备去注册。
例如，源核心网控制面设备在向终端设备发送第一NSSAI和第一指示信息之后，将终端设备从源核心网控制面设备去注册，使得源核心网控制面设备不再为终端设备提供服务。源核心网控制面设备中不再存储有终端设备的上下文信息。因此，该终端设备或任意核心网控制面设备均无法向源核心网控制面设备请求终端设备的上下文信息，避免了业务交互，提高了安全性。
S204、终端设备根据第一NSSAI和第一指示信息，向接入网设备发送第一注册请求消息，第一注册请求消息携带第一NSSAI和终端设备的永久标识。
例如，源核心网控制面设备向终端设备发送第一NSSAI和第一指示信息，其中第一 NSSAI用于索引目标核心网控制面设备，第一指示信息用于指示终端设备的临时标识无效。第一NSSAI和第一指示信息用于触发终端设备发起注册请求流程。终端设备向接入网设备发送第一注册请求消息，第一注册请求中携带终端设备的永久标识。示例性的，终端设备通过接入网设备向第一NSSAI指示的目标核心网控制面设备发送第一注册请求消息，以将终端设备重定向至目标核心网控制面设备。
例如，终端设备在接收到第一NSSAI和第一指示信息之后，获知终端设备的临时标识已经失效并根据第一NSSAI向接入网设备发送第一注册请求消息。示例性的，终端设备发送第一注册请求消息的方式可以为：
终端设备在向接入网设备发送第一注册请求消息时，可以与终端设备和接入网设备之间的无线资源控制(Radio Resource Control，RRC)消息一起发送。RRC消息中携带了第一NSSAI和终端设备所选择的PLMN。接入网设备根据RRC消息中的第一NSSAI和终端设备所选择的PLMN，确定终端设备的目标核心网控制面设备，并将第一注册请求消息转发给目标核心网控制面设备。目标核心网控制面设备收到第一注册请求后，根据终端设备的永久标识向用户数据管理中心设备请求终端设备的签约数据，并根据签约数据完成终端设备在目标核心网控制面设备上的注册流程。
其中，第一注册请求可以为非接入层(Non-Access Stratum，NAS)消息，NAS消息中携带了终端设备的永久标识以及第一NSSAI。示例性的，终端设备的永久标识可以为国际移动识别码(International Mobile Subscriber Identity，IMSI)，也可以为用户永久标识(Subscriber Permanent Identity，SUPI)。
本申请实施例提供的核心网控制面设备选择方法，源核心网控制面设备在接收到指示目标核心网控制面设备的第一NSSAI，若无法确定第一NSSAI所索引的目标核心网控制面设备，源核心网控制面设备获知与目标核心网控制面设备之间需要隔离则源核心网控制面设备向终端设备发送第一NSSAI和第一指示信息，终端设备根据第一指示信息获知终端设备的临时标识设置为无效后，向接入网设备发送携带有第一NSSAI和终端设备的永久标识的注册请求消息，从而避免了源核心网控制面设备和目标核心网控制面设备之间进行信息交互，提高了网络切片之间的安全性，也提高了终端设备重定向到目标核心网控制面的流程效率，节约了信令。同时，源核心网控制面设备通过将终端设备的临时标识设置为无效，并将终端设备从源核心网控制面设备去注册，使得源核心网控制面设备不再为终端设备提供服务，避免了终端设备再次与源核心网控制面设备之间进行业务交互，提高了网络切片安全性。综上，本申请提供的核心网控制面设备选择方法，提高了网络切片安全性和终端设备的重定向流程效率，节约了信令。
进一步地，在图2所示实施例的基础上，图3和图4分别基于源核心网控制面设备无法确定第一NSSAI所索引的目标核心网控制面设备的可能的两种实现方式，进行进一步描述。图3和图4是本申请实施例提供的核心网控制面设备选择方法的信令交互图。
参照图3，本申请实施例提供的核心网控制面设备选择方法包括如下步骤：
S301、源核心网控制面设备从用户数据管理中心设备获取终端设备的签约数据。
例如，源核心网控制面设备接收用户数据管理中心设备发送的终端设备的签约数据。用户数据管理中心设备发现存储在其中的终端设备的签约数据发生改变后，用户数据管理 中心设备根据终端设备的永久标识确定终端设备当前注册的源核心网控制面设备。然后，用户数据管理中心设备将终端设备的新的签约数据和终端设备的永久标识发送给源核心网控制面设备。
可选的，用户数据管理中心设备发送签约数据的方式可以为：
用户数据管理中心设备通过插入签约数据请求消息将终端设备的新的签约数据发送给源核心网控制面设备。当源核心网控制面设备接收到终端设备的新的签约数据和终端设备的永久标识时，源核心网控制面设备即可确定注册在该源核心网控制面设备上的具体哪一个终端设备的签约数据发生了变化。
可选的，在源核心网控制面设备在接收到终端设备的新的签约数据后，源核心网控制面设备还可向用户数据管理中心设备发送插入签约数据应答消息。
S302、源核心网控制面设备根据签约数据确定第一NSSAI。
示例性的，源核心网控制面设备在接收到终端设备的新的签约数据时，源核心网控制面设备比较终端设备的新的签约数据与终端设备的旧的签约数据，确定签约数据中发生变化的项目是否导致NSSAI的变化。若导致NSSAI发生变化，则源核心网控制面设备根据签约数据中发生变化的项目获取第一NSSAI。可选的实现方式中，源核心网控制面设备可以配置签约数据与NSSAI之间的对应关系，通过签约数据确定NSSAI。
或者，源核心网控制面设备在接收到终端设备的新的签约数据时，新的签约数据包含第一NSSAI，源核心网控制面设备可以直接获取到第一NSSAI。若签约数据中发生变化的项目不会导致NSSAI发生变化，则终端设备无需进行核心网控制面设备的重定向注册。
S303、源核心网控制面设备无法确定第一NSSAI所索引的目标核心网控制面设备。
例如，当源核心网控制面设备与第一NSSAI所索引的目标核心网控制面设备之间存在隔离需求，则源核心网控制面设备无法确定第一NSSAI所索引的目标核心网控制面设备。
若源网络切片与目标网络切片之间不具有安全隔离需求，源核心网控制面设备与目标核心网控制面设备之间能够通信，则终端设备可向接入网设备发送携带第一NSSAI和终端设备的临时标识的注册请求消息或者跟踪区更新(Tracking Area Update，TAU)请求消息。目标核心网控制面设备可根据终端设备的临时标识向源核心网控制面设备请求终端设备的上下文信息，从而完成注册流程或者TAU流程。
进一步地，在源核心网控制面设备获取终端设备的第一NSSAI，根据第一NSSAI确定目标核心网控制面设备之前，本申请实施例提供的核心网控制面设备选择方法还包括：
源核心网控制面设备从终端设备接收第二注册请求消息，第二注册请求消息携带第二NSSAI，第二NSSAI用于索引源核心网控制面设备。
例如，在终端设备接入PLMN之前，终端设备上预设有配置NSSAI(Configured NSSAI)，即第二NSSAI。Configured NSSAI用于指示终端设备在选择的PLMN中的可选的网络切片。终端设备第一接入网络切片时，向接入网设备设备发送初始注册请求，初始注册请求中携带有Configured NSSAI，接入网设备根据Configured NSSAI，将初始注册请求中的终端设备的永久标识，发送至Configured NSSAI对应的核心网控制面设备，即源核心网控制面设备，从而完成终端设备的初始注册。
可选的，在源核心网控制面设备判断无法确定第一NSSAI所索引的目标核心网控制面设备之前，源核心网控制面设备还需确定源核心网控制面设备能否继续为终端设备服务。
例如，确定源核心网控制面设备能否继续为终端设备服务的方式为：
源核心网控制面设备根据最新的签约数据确定第一NSSAI，并判断第一NSSAI所关联的切片类型或者业务类型不在源核心网控制面设备所关联的切片类型或者业务类型范围之内，说明终端设备无法通过源核心网控制面设备接入到第一NSSAI指示的目标网络切片中，则判断源核心网控制面设备不能继续服务终端设备。若源核心网控制面设备确定源核心网控制面设备不能继续为终端设备服务，则进一步判断源网络切片是否可以确定第一NSSAI所索引的目标核心网控制面设备。若源核心网控制面设备确定源核心网控制面设备能继续为终端设备服务，则终端设备无需进行核心网控制面设备的重定向注册，可仍注册在该源核心网控制面设备上，通过该源核心网控制面设备接入到目标网络切片上。
示例性的，若终端设备的新的签约数据与旧的签约数据相比，指示相同切片类型的网络切片，则终端设备可以由同一核心网控制面设备服务。若终端设备的第二NSSAI所关联的切片类型包括1、2和3，当终端设备的第一NSSAI所关联的切片类型包括1和/或2时，则认为源核心网控制面设备可继续服务终端设备；当终端设备的第一NSSAI所关联的切片类型包括4时，则认为源核心网控制面设备不能继续服务终端设备。
S304、源核心网控制面设备将终端设备的临时标识设置为无效。
例如，当源核心网控制面设备确定源核心网控制面设备无法继续服务终端设备，且源核心网控制面设备无法确定第一NSSAI所索引的目标核心网控制面设备时，源核心网控制面设备将终端设备的临时标识设置为无效。
例如，源核心网控制面设备将终端设备的临时标识设置为无效的方式具体可以为：为终端设备设置无效的临时标识，或将终端设备的临时标识从源核心网控制面设备的服务列表中删除。
S305、源核心网控制面设备向终端设备发送第一NSSAI和第一指示信息。该第一指示信息用于指示终端设备的临时标识无效。
例如，源核心网控制面设备向终端设备发送第一NSSAI和第一指示信息的方式包括：
第一种：如果终端设备处于连接状态，源核心网控制面设备通过终端设备临时标识重分配过程将第一NSSAI和第一指示信息下发给终端设备。
第二种：如果终端设备处于空闲状态，源核心网控制面设备可等待终端设备发起TAU流程/业务请求流程，完成与源核心网控制面设备的注册，再将第一NSSAI和第一指示信息通过TAU接受消息/业务请求完成流程下发给终端设备。
第三种：如果终端设备处于空闲状态，源核心网控制面设备可以寻呼终端设备，触发终端设备发起业务请求，从空闲状态变成连接状态，从而采用第一种方式向终端设备发送第一NSSAI和第一指示信息。
可选的，源核心网控制面设备向终端设备发送第一NSSAI和第一指示信息还可采用其他可行的方式，以上多种可能实现的方式可以由源核心网控制面设备根据网络策略而定，本申请对此不做限定。
S306、源核心网控制面设备将终端设备从源核心网控制面设备去注册。
例如，源核心网控制面设备将终端设备的上下文信息从源核心网控制面设备中删除。S307、终端设备根据第一NSSAI和第一指示信息，向接入网设备发送第一注册请求消息，接入网设备将第一注册请求消息发送至目标核心网控制面设备；第一注册请求消息携带第 一NSSAI和终端设备的永久标识。
例如，终端设备在NAS消息中携带终端设备的永久标识以及第一NSSAI，RRC消息中携带第一NSSAI和终端设备所选择的PLMN。接入网设备收到RRC消息后，根据RRC消息中携带的第一NSSAI和PLMN为终端设备选择目标核心网控制面设备。接入网设备将终端设备发送的NAS消息转发给目标核心网控制面设备。
S308、目标核心网控制面设备根据终端设备的永久标识从用户数据管理中心设备获取终端设备的签约数据。
例如，目标核心网控制面设备根据终端设备的签约数据继续完成终端设备注册流程。终端设备的注册流程可采用LTE系统或5G系统中的注册流程，本申请不做详细说明。
本实施例中，用户数据管理中心设备在检测到终端设备的签约数据发生变化时，将终端设备的新的签约数据发送给源核心网控制面设备，以使源核心网控制面设备根据新的签约数据得到用于索引目标核心网控制面设备的第一NSSAI。同时，源核心网控制面设备可根据终端设备处理连接状态或空闲状态的不同，采用不同的方式向终端设备发送第一NSSAI和第一指示信息，提高了信令交互的灵活性。本实施例中还根据第一NSSAI所关联的切片类型或者业务类型是否在源核心网控制面设备所关联的切片类型或者业务类型范围之内，来确定源核心网控制面设备能否继续服务终端设备，可避免在源核心网控制面设备能继续服务终端设备时，进行终端设备的重定向，减少了信令开销。
图4为本申请实施例提供的核心网控制面设备选择方法的信令交互图。
参照图4，本申请实施例提供的核心网控制面设备选择方法包括如下步骤：
S401、源核心网控制面设备从用户数据管理中心设备获取终端设备的签约数据。
S402、源核心网控制面设备根据签约数据确定第一NSSAI。
S403、源核心网控制面设备向缺省核心网控制面设备发送第一NSSAI，以请求第一NSSAI所索引的目标核心网控制面设备
S404、缺省核心网控制面设备向源核心网控制面设备指示无法确定第一NSSAI所索引的目标核心网控制面设备。例如，缺省核心网控制面设备向源核心网控制面设备发送第二指示信息，该第二指示信息用于指示无法确定第一NSSAI所索引的目标核心网控制面设备。或者，缺省核心网控制面设备向源核心网控制面设备发送请求失败消息，或拒绝向源核心网控制面设备发送消息，从而告知源核心网控制面设备：无法确定第一NSSAI所索引的目标核心网控制面设备。例如，由于源核心网控制面设备所在的切片与目标核心网控制面设备所在的切片之间需要隔离，则无法确定第一NSSAI所索引的目标核心网控制面设备。
换句话说，请求失败，源核心网控制面设备无法确定第一NSSAI所索引的目标核心网控制面设备。
例如，当源核心网控制面设备可根据签约数据确定第一NSSAI，但无法根据第一NSSAI确定源核心网控制面设备与目标核心网控制面设备之间是否能够通信时，源核心网控制面设备通过上述步骤S404获知无法确定目标核心网控制面设备。
可选的，与图3所示实施例类似，源核心网控制面设备在判断第一NSSAI所索引的目标核心网控制面设备之前，源核心网控制面设备还需确定源核心网控制面设备能否继续为终端设备服务。例如，确定源核心网控制面设备能否继续为终端设备服务的方式为：
源核心网控制面设备根据最新的签约数据确定第一NSSAI，并判断第一NSSAI所关联的切片类型或者业务类型不在源核心网控制面设备所关联的切片类型或者业务类型范围之内，说明终端设备无法通过源核心网控制面设备接入到第一NSSAI指示的目标网络切片中，则判断源核心网控制面设备不能继续服务终端设备。若源核心网控制面设备确定源核心网控制面设备不能继续为终端设备服务，则判断源网络切片与目标网络切片之间是否需要隔离。若源核心网控制面设备确定源核心网控制面设备能继续为终端设备服务，则终端设备无需进行核心网控制面设备的重定向注册，可仍注册在该源核心网控制面设备上，通过该源核心网控制面设备接入到目标网络切片上。
S405、源核心网控制面设备将终端设备的临时标识设置为无效。
S406、源核心网控制面设备向终端设备发送第一NSSAI和第一指示信息。该第一指示信息用于指示终端设备的临时标识无效。
S407、源核心网控制面设备将终端设备从源核心网控制面设备去注册。
S408、终端设备根据第一NSSAI和第一指示信息，向接入网设备发送第一注册请求消息，接入网设备将第一注册请求消息发送至目标核心网控制面设备；第一注册请求消息携带第一NSSAI和终端设备的永久标识。
S409、目标核心网控制面设备根据终端设备的永久标识从用户数据管理中心设备获取终端设备的签约数据。
其中，步骤S401至S403及S405至S409可参考图3中S301至S302及S304至S308的描述，此处不再赘述。
本实施例中，源核心网控制面设备向缺省核心网控制面设备发送第一NSSAI，以使缺省核心网控制面设备根据签约数据获取第一NSSAI，以及第一NSSAI索引的目标核心网控制面设备。缺省核心网控制面设备将无法确定目标核心网控制面设备的判断结果返回给源核心网控制面设备，使得源核心网控制面设备触发后续操作，从而解决了可能导致的终端设备重定向不成功的问题。
本申请第二方面还提供一种核心网控制面设备选择方法。与上述第一方面中的任一实施例不同的是，当源核心网控制面设备不能确定第一NSSAI时，本实施例中源核心网控制面设备将终端设备先重定向在缺省核心网控制面设备上，再由缺省核心网控制面设备服务终端设备，将终端设备重定向在目标核心网控制面设备上。下面采用详细的实施例，对本申请提供的核心网控制面设备选择方法进行详细说明。
图5为本申请实施例提供的核心网控制面设备选择方法的信令交互图。参照图5，本申请实施例提供的核心网控制面设备选择方法包括如下步骤：
S501、源核心网控制面设备从用户数据管理中心设备获取终端设备的签约数据。
其中，终端设备的签约数据的获取方式可以与上述任一实施例所述的方法相似，此处不再赘述。
S502、源核心网控制面设备判断不能确定第一NSSAI，第一NSSAI用于索引目标核心网控制面设备。
示例性的，源核心网控制面设备在获取到终端设备的签约数据时，源核心网控制面设 备判断是否能够确定终端设备的第一NSSAI。当源核心网控制面设备判断能够确定终端设备的第一NSSAI，则可执行上述图2至图6任一所示的实施例。
其中，源核心网控制面设备判断不能确定终端设备的第一NSSAI，可以为源核心网控制面设备自身不能根据终端设备的签约数据确定终端设备的第一NSSAI，也可以为源核心网控制面设备无法从缺省核心网控制面设备获取终端设备的第一NSSAI。
S503、源核心网控制面设备向终端设备发送第三NSSAI以及第一指示信息，第三NSSAI用于索引缺省核心网控制面设备，第一指示信息用于指示终端设备的临时标识无效，第三NSSAI用于索引缺省核心网控制面设备。
例如，当源核心网控制面设备判断不能确定第一NSSAI时，源核心网控制面设备通过向终端设备发送第三NSSAI以及第一指示信息。当终端设备接收到第一指示信息时，终端设备确定源核心网控制面设备为自己分配的临时标识无效。终端设备根据第三NSSAI，将终端设备重定向注册在缺省核心网控制面设备上。
例如，源核心网控制面设备向终端设备发送第三NSSAI和第一指示信息的方式包括：
第一种：如果终端设备处于连接状态，源核心网控制面设备通过终端设备临时标识重分配过程将第三NSSAI和第一指示信息下发给终端设备。
第二种：如果终端设备处于空闲状态，源核心网控制面设备选择等待终端设备发起TAU流程/业务请求流程，完成与源核心网控制面设备的注册，再将第三NSSAI和第一指示信息通过TAU接受消息/业务请求完成流程下发给终端设备。
第三种：如果终端设备处于空闲状态，源核心网控制面设备可以选择寻呼终端设备，触发终端设备发起业务请求，从空闲状态变成连接状态，从而采用第一种方式向终端设备发送第三NSSAI和第一指示信息。
可选的，源核心网控制面设备向终端设备发送第三NSSAI和第一指示信息还可采用其他可行的方式，以上多种可能实现的方式可以由源核心网控制面设备根据网络策略而定，本申请对此不做限定。
可选的，在S503之前，本申请实施还包括：
S5031、源核心网控制面设备将终端设备的临时标识设置为无效。
例如，当源核心网控制面设备判断无法确定终端设备的第一NSSAI时，源核心网控制面设备将终端设备的临时标识设置为无效。
例如，源核心网控制面设备将终端设备的临时标识设置为无效的方式具体可以为：为终端设备设置无效的临时标识，或将终端设备的临时标识从源核心网控制面设备的服务列表中删除。
可选的，在S503之后，本申请实施还包括：
S5032、源核心网控制面设备将终端设备从源核心网控制面设备去注册。
例如，当源核心网控制面设备判断不能确定第一NSSAI时，可直接认为源核心网控制面设备无法向终端设备提供服务，源核心网控制面设备与终端设备具有隔离性需求。可直接将终端设备从源核心网控制面设备去注册，避免了终端设备通过源核心网控制面设备访问源网络切片，隔离了源网络切片和终端设备，提高了网络切片安全性。
S504、终端设备根据第三NSSAI和第一指示信息，向接入网设备发送第三注册请求消息，第三注册请求消息携带第三NSSAI和终端设备的永久标识。
例如，终端设备在NAS消息中携带终端设备的永久标识以及第三NSSAI，RRC消息中携带第三NSSAI和终端设备所选择的PLMN。接入网设备收到RRC消息后，根据RRC消息中携带的第三NSSAI和PLMN为终端设备选择缺省核心网控制面设备。
S505、缺省核心网控制面设备从接入网设备接收第三注册请求消息。
示例性的，终端设备根据接收到的第三NSSAI，向接入网设备发送第三注册请求消息。接入网设备根据第三NSSAI为终端设备确定具体的缺省核心网控制面设备，并将第三注册请求消息转发给缺省核心网控制面设备。第三注册请求消息携带第三NSSAI和终端设备的永久标识。
S506、缺省核心网控制面设备根据永久标识向用户数据管理中心设备获取终端设备的签约数据。
例如，缺省核心网控制面设备向用户数据管理中心设备发送终端设备的永久标识，接收用户数据管理中心设备返回的终端设备的签约数据。
S507、缺省核心网控制面设备根据签约数据确定终端设备的目标核心网控制面设备。
例如，缺省核心网控制面设备根据签约数据确定终端设备的第一NSSAI，并根据第一NSSAI和终端设备选择的PLMN确定目标核心网控制面设备。
S508、缺省核心网控制面设备将终端设备重定向至目标核心网控制面设备。
在确定目标核心网控制面设备之后，缺省核心网控制面设备将终端设备重定向至目标核心网控制面设备。
可选的，缺省核心网控制面设备将终端设备重定向至目标核心网控制面设备的过程，具体包括至少如下两种可行的实现方式：
第一种可行的实现方式：
缺省核心网控制面设备向接入网设备发送第一重定向指示消息，第一重定向指示消息用于触发接入网设备将终端设备重定向至目标核心网控制面设备。
例如，缺省核心网控制面设备向接入网设备发送第一重定向指示消息，第一重定向指示消息携带终端设备的第一NSSAI、目标核心网控制面设备的标识信息，以及终端设备的永久标识。接入网设备接收到第一重定向指示消息后，根据第一重定向指示消息中携带的目标核心网控制面设备的标识信息选择目标核心网控制面设备，并将终端设备的永久标识转发目标核心网控制面设备，使得目标核心网控制面设备完成终端设备的重定向。
第二种可行的实现方式：
缺省核心网控制面设备向目标核心网控制面设备发送第二重定向指示消息，第二重定向指示消息用于触发目标核心网控制面设备完成终端设备的重定向。
例如，缺省核心网控制面根据目标核心网控制面设备的标识信息，直接向目标核心网控制面设备发送第二重定向指示消息，第二重定向指示消息携带终端设备的第一NSSAI以及终端设备的永久标识，使得目标核心网控制面设备完成终端设备的重定向。
本申请再一方面还提供一种核心网控制面设备和终端设备，用于执行上述图2至图5所示实施例提供核心网控制面设备选择方法，具有相同的技术特征和技术效果，本申请对此不再赘述。
图6为本申请一实施例提供的核心网控制面设备的结构示意图。该核心网控制面设备可以为上述图2至图4所示实施例中的源核心网控制面设备，该核心网控制面设备可以通过软件、硬件或者软硬件结合的方式实现。如图6所示，包括：
获取模块601，用于获取终端设备的第一网络切片选择辅助信息，
发送模块602，用于若所述源核心网控制面设备无法确定所述第一网络切片选择辅助信息所索引的目标核心网控制面设备，所述源核心网控制面设备向所述终端设备发送所述第一网络切片选择辅助信息以及第一指示信息，以触发所述终端设备发送第一注册请求消息，其中，所述第一指示信息用于指示所述终端设备的临时标识无效，所述第一注册请求消息携带所述第一网络切片选择辅助信息和所述终端设备的永久标识。
可选的，在图6所示实施例的基础上，图7为本申请另一实施例提供的核心网控制面设备的结构示意图。如图7所示，核心网控制面设备还包括：
临时标识设置模块603，用于将终端设备的临时标识设置为无效。
可选的，获取模块601具体用于，
从用户数据管理中心设备获取终端设备的签约数据；
根据签约数据确定第一网络切片选择辅助信息。
可选的，获取模块601具体用于，
从用户数据管理中心设备获取终端设备的签约数据；
向缺省核心网控制面设备发送签约数据，以请求终端设备的第一网络切片选择辅助信息；
从缺省核心网控制面设备接收第一网络切片选择辅助信息。
可选的，如图7所示，核心网控制面设备还包括：
服务检测模块604，用于根据所述第一网络切片选择辅助信息判断所述源核心网控制面设备不能继续服务所述终端设备。
可选的，如图7所示，核心网控制面设备还包括：
接收模块605，用于从终端设备接收第二注册请求消息，第二注册请求消息携带第二网络切片选择辅助信息，第二网络切片选择辅助信息用于索引源核心网控制面设备；
服务检测模块604，具体用于确定所述第一网络切片选择辅助信息所关联的切片类型或者业务类型不在所述第二网络切片选择辅助信息所关联的切片类型或者业务类型范围之内，则判断所述源核心网控制面设备不能继续服务所述终端设备。
可选的，核心网控制面设备还包括：
目标核心网控制面设备获取模块606，用于向缺省核心网控制面设备发送所述第一网络切片选择辅助信息，以请求所述第一网络切片选择辅助信息所索引的目标核心网控制面设备；
若请求失败，则确认所述源核心网控制面设备无法确定第一网络切片选择辅助信息所索引的目标核心网控制面设备。
可选的，核心网控制面设备还包括：
去注册模块607，用于将终端设备从源核心网控制面设备去注册。
去注册模块607具体用于，删除源核心网控制面设备存储的所述终端设备的上下文信息。
图8为本申请一实施例提供的终端设备的结构示意图。该终端设备可以为上述图2至图4所示实施例中的终端设备，该终端设备可以通过软件、硬件或者软硬件结合的方式实现。如图8所示，包括：
接收模块801，用于从源核心网控制面设备接收第一网络切片选择辅助信息和第一指示信息，第一网络切片选择辅助信息用于索引目标核心网控制面设备，第一指示信息用于指示终端设备的临时标识无效；
发送模块802，用于根据第一网络切片选择辅助信息和第一指示信息，向接入网设备发送第一注册请求消息；
其中，第一注册请求消息携带第一网络切片选择辅助信息和终端设备的永久标识。
图9为本申请一实施例提供的核心网控制面设备的结构示意图。该核心网控制面设备可以为上述图5所示实施例中的源核心网控制面设备，该核心网控制面设备可以通过软件、硬件或者软硬件结合的方式实现。如图9所示，包括：
判断模块901，用于判断是否能确定第一网络切片选择辅助信息，第一网络切片选择辅助信息用于索引目标核心网控制面设备；
发送模块902，用于若所述源核心网控制面设备无法确定所述第一网络切片选择辅助信息，向终端设备发送第三网络切片选择辅助信息以及第一指示信息，以触发终端设备发送第三注册请求消息，其中，第一指示信息用于指示终端设备的临时标识无效，第三网络切片选择辅助信息用于索引缺省核心网控制面设备，第三注册请求消息携带第三网络切片选择辅助信息和终端设备的永久标识。
可选的，还包括：
临时标识设置模块903，用于在无法确定第一网络切片选择辅助信息时，将终端设备的临时标识设置为无效。
可选的，还包括：
去注册模块904，用于将终端设备从源核心网控制面板设备去注册。
图10为本申请一实施例提供的终端设备的结构示意图。该终端设备可以为上述图5所示实施例中的终端设备，该终端设备可以通过软件、硬件或者软硬件结合的方式实现。如图10所示，包括：
接收模块1001，用于从源核心网控制面设备接收第三网络切片选择辅助信息和第一指示信息，第三网络切片选择辅助信息用于索引缺省核心网控制面设备，第一指示信息用于指示终端设备的临时标识无效；
发送模块1002，用于根据第三网络切片选择辅助信息和第一指示信息，向接入网设备发送第三注册请求消息；
其中，第三注册请求消息携带第三网络切片选择辅助信息和终端设备的永久标识。
图11为本申请一实施例提供的核心网控制面设备的结构示意图。该核心网控制面设备可以为上述图5所示实施例中的缺省核心网控制面设备，该核心网控制面设备可以通过软件、硬件或者软硬件结合的方式实现。如图11所示，包括：
接收模块1101，用于从接入网设备接收第三注册请求消息，第三注册请求消息携带终端设备的永久标识；
签约数据获取模块1102，用于根据永久标识向用户数据管理中心设备获取终端设备的签约数据；
目标核心网控制面设备获取模块1103，用于根据签约数据确定终端设备的目标核心网控制面设备；
重定向模块1104，用于将终端设备重定向至目标核心网控制面设备。
在一种可能的实施方式中，重定向模块1104还包括：
发送单元1105，用于向接入网设备发送第一重定向指示消息，第一重定向指示消息用于触发接入网设备将终端设备重定向至目标核心网控制面设备；或者，向目标核心网控制面设备发送第二重定向指示消息，第二重定向指示消息用于触发目标核心网控制面设备完成终端设备的重定向。
本申请再一方面还提供一种核心网控制面设备和终端设备，用于执行上述图2至图5所示实施例提供核心网控制面设备选择方法，具有相同的技术特征和技术效果，本申请对此不再赘述。
图12为本申请一实施例提供的核心网控制面设备的结构示意图。该核心网控制面设备可以为上述图2至图4所示实施例中的源核心网控制面设备，如图12所示，包括：
处理器1201，用于获取终端设备的第一网络切片选择辅助信息，
发送器1202，用于若所述第一核心网控制面设备无法确定所述第一网络切片选择辅助信息所索引的第二核心网控制面设备，所述第一核心网控制面设备向所述终端设备发送所述第一网络切片选择辅助信息以及第一指示信息，以触发所述终端设备发送第一注册请求消息，其中，所述第一指示信息用于指示所述终端设备的临时标识无效，所述第一注册请求消息携带所述第一网络切片选择辅助信息和所述终端设备的永久标识。
可选的，所述处理器1201还用于，将终端设备的临时标识设置为无效。
可选的，所述处理器1201具体用于，
从用户数据管理中心设备获取终端设备的签约数据；
根据签约数据确定第一网络切片选择辅助信息。
可选的，所述处理器1201具体用于，从用户数据管理中心设备获取终端设备的签约数据；
所述发送器还用于，向第三核心网控制面设备发送签约数据，以请求终端设备的第一网络切片选择辅助信息；
所述第一核心网控制面设备还包括：接收器1203；
所述接收器，用于从第三核心网控制面设备接收第一网络切片选择辅助信息。
可选的，所述处理器1201具体用于，
根据所述第一网络切片选择辅助信息判断所述第一核心网控制面设备不能继续服务所述终端设备。
可选的，所述接收器1203还用于，
从终端设备接收第二注册请求消息，第二注册请求消息携带第二网络切片选择辅助信息，第二网络切片选择辅助信息用于索引第一核心网控制面设备。
可选的，所述处理器1201还用于，
在确定第一网络切片选择辅助信息所关联的切片类型或者业务类型不在第二网络切片选择辅助信息所关联的切片类型或者业务类型范围之内时，判断第一核心网控制面设备不能继续服务终端设备。
可选的，所述发送器1202还用于，
向第三核心网控制面设备发送所述第一网络切片选择辅助信息，以请求所述第一网络切片选择辅助信息所索引的第二核心网控制面设备；
所述处理器1201还用于，若请求失败，则确认所述第一核心网控制面设备无法确定第一网络切片选择辅助信息所索引的第二核心网控制面设备。
可选的，所述处理器1201还用于，
将终端设备从第一核心网控制面设备去注册。
可选的，所述处理器1201还用于，
删除所述第一核心网控制面设备存储的所述终端设备的上下文信息。
图13为本申请一实施例提供的终端设备的结构示意图。该终端设备可以为上述图2至图4所示实施例中的终端设备，如图13所示，包括：
接收器1301，用于从第一核心网控制面设备接收第一网络切片选择辅助信息和第一指示信息，第一网络切片选择辅助信息用于索引第二核心网控制面设备，第一指示信息用于指示终端设备的临时标识无效；
发送器1302，用于根据第一网络切片选择辅助信息和第一指示信息，向接入网设备发送第一注册请求消息；
其中，第一注册请求消息携带第一网络切片选择辅助信息和终端设备的永久标识。
图14为本申请一实施例提供的核心网控制面设备的结构示意图。该核心网控制面设备可以为上述图5所示实施例中的源核心网控制面设备，如图14所示，包括：
处理器1401，用于判断是否能确定第一网络切片选择辅助信息，第一网络切片选择辅助信息用于索引第五核心网控制面设备；
发送器1402，用于用于若源核心网控制面设备无法确定所述第一网络切片选择辅助信息，向终端设备发送第三网络切片选择辅助信息以及第一指示信息，以触发终端设备发送第三注册请求消息，其中，第一指示信息用于指示终端设备的临时标识无效，第三网络切片选择辅助信息用于索引第六心网控制面设备，第三注册请求消息携带第三网络切片选择辅助信息和终端设备的永久标识。
可选的，处理器1401还用于，将终端设备的临时标识设置为无效。
可选的，处理器1401还用于，将终端设备从第四核心网控制面设备去注册。
图15为本申请一实施例提供的终端设备的结构示意图。该终端设备可以为上述图5所示实施例中的终端设备，如图15所示，包括：
接收器1501，用于从第四核心网控制面设备接收第三网络切片选择辅助信息和第一指示信息，第三网络切片选择辅助信息用于索引第六核心网控制面设备，第一指示信息用于指示终端设备的临时标识无效；
发送器1502，用于根据第三网络切片选择辅助信息和第一指示信息，向接入网设备发送第三注册请求消息；
其中，第三注册请求消息携带第三网络切片选择辅助信息和终端设备的永久标识。
图16为本申请一实施例提供的核心网控制面设备的结构示意图。该核心网控制面设备可以为上述图5所示实施例中的缺省核心网控制面设备，如图16所示，包括：
接收器1601，用于从接入网设备接收第三注册请求消息，第三注册请求消息携带终端设备的永久标识；
处理器1602，用于根据永久标识向用户数据管理中心设备获取终端设备的签约数据；
处理器1602还用于，根据签约数据确定终端设备的第五核心网控制面设备；
处理器1602还用于，将终端设备重定向至第五核心网控制面设备。
可选的，核心网控制面设备还包括：
发送器1603，用于向接入网设备发送第一重定向指示消息，第一重定向指示消息用于触发接入网设备将终端设备重定向至第五核心网控制面设备；或者，
向第五核心网控制面设备发送第二重定向指示消息，第二重定向指示消息用于触发第五核心网控制面设备完成终端设备的重定向。
另外，需要说明的是，应理解以上核心网控制面设备、终端设备的各个模块的划分仅仅是一种逻辑功能的划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用硬件加软件功能单元的形式实现。
本申请实施例还提供一种程序，该程序在被处理器执行时用于执行上述图2至图4所示实施例中源核心网控制面设备侧的方法。本申请实施例还提供一种程序产品，例如计算机可读存储介质，包括如上所述的程序。本申请实施例还提供一种计算机可读存储介质，所述计算机可读存储介质中存储有指令，当其在计算机上运行时，使得计算机执行上述图2至图4所示实施例中源核心网控制面设备侧的方法方法。
本申请实施例还提供一种程序，该程序在被处理器执行时用于执行上述图2至图4所示实施例中终端设备侧的方法。本申请实施例还提供一种程序产品，例如计算机可读存储介质，包括如上所述的程序。本申请实施例还提供一种计算机可读存储介质，所述计算机可读存储介质中存储有指令，当其在计算机上运行时，使得计算机执行上述图2至图4所示实施例中终端设备侧的方法。
申请实施例还提供一种程序，该程序在被处理器执行时用于执行上述图2至图4所示实施例中缺省核心网控制面设备侧的方法。本申请实施例还提供一种程序产品，例如计算机可读存储介质，包括如上所述的程序。本申请实施例还提供一种计算机可读存储介质，所述计算机可读存储介质中存储有指令，当其在计算机上运行时，使得计算机执行上述图2至图4所示实施例中缺省核心网控制面设备侧的方法。
申请实施例还提供一种程序，该程序在被处理器执行时用于执行上述图5所示实施例 中源核心网控制面设备侧的方法。本申请实施例还提供一种程序产品，例如计算机可读存储介质，包括如上所述的程序。本申请实施例还提供一种计算机可读存储介质，所述计算机可读存储介质中存储有指令，当其在计算机上运行时，使得计算机执行上述图5所示实施例中源核心网控制面设备侧的方法。
申请实施例还提供一种程序，该程序在被处理器执行时用于执行上述图5所示实施例中终端设备侧的方法。本申请实施例还提供一种程序产品，例如计算机可读存储介质，包括如上所述的程序。本申请实施例还提供一种计算机可读存储介质，所述计算机可读存储介质中存储有指令，当其在计算机上运行时，使得计算机执行上述图5所示实施例中终端设备侧的方法。
申请实施例还提供一种程序，该程序在被处理器执行时用于执行上述图5所示实施例中缺省核心网控制面设备侧的方法。本申请实施例还提供一种程序产品，例如计算机可读存储介质，包括如上所述的程序。本申请实施例还提供一种计算机可读存储介质，所述计算机可读存储介质中存储有指令，当其在计算机上运行时，使得计算机执行上述图5所示实施例中缺省核心网控制面设备侧的方法。

Claims (30)

  1. 一种核心网控制面设备选择方法，其特征在于，包括：
    源核心网控制面设备获取终端设备的第一网络切片选择辅助信息，
    若所述源核心网控制面设备无法确定所述第一网络切片选择辅助信息所索引的目标核心网控制面设备，所述源核心网控制面设备向所述终端设备发送所述第一网络切片选择辅助信息以及第一指示信息，以触发所述终端设备发送第一注册请求消息，其中，所述第一指示信息用于指示所述终端设备的临时标识无效，所述第一注册请求消息携带所述第一网络切片选择辅助信息和所述终端设备的永久标识。
  2. 根据权利要求1所述的方法，其特征在于，所述方法还包括：
    所述源核心网控制面设备将所述终端设备的临时标识设置为无效。
  3. 根据权利要求1或2所述的方法，其特征在于，所述源核心网控制面设备获取终端设备的第一网络切片选择辅助信息，包括：
    所述源核心网控制面设备从用户数据管理中心设备获取所述终端设备的签约数据；
    所述源核心网控制面设备根据所述签约数据确定所述第一网络切片选择辅助信息。
  4. 根据权利要求1或2所述的方法，其特征在于，所述源核心网控制面设备获取终端设备的第一网络切片选择辅助信息，包括：
    所述源核心网控制面设备从用户数据管理中心设备获取所述终端设备的签约数据；
    所述源核心网控制面设备向缺省核心网控制面设备发送所述签约数据，以请求所述终端设备的第一网络切片选择辅助信息；
    所述源核心网控制面设备从所述缺省核心网控制面设备接收所述第一网络切片选择辅助信息。
  5. 根据权利要求1至4任一项所述的方法，其特征在于，在所述源核心网控制面设备无法确定所述第一网络切片选择辅助信息所索引的目标核心网控制面设备之前，所述方法还包括：
    所述源核心网控制面设备根据所述第一网络切片选择辅助信息判断所述源核心网控制面设备不能继续服务所述终端设备。
  6. 根据权利要求5所述的方法，其特征在于，所述方法还包括：
    所述源核心网控制面设备从所述终端设备接收第二注册请求消息，所述第二注册请求消息携带第二网络切片选择辅助信息，所述第二网络切片选择辅助信息用于索引所述源核心网控制面设备。
  7. 根据权利要求6所述的方法，其特征在于，所述源核心网控制面设备根据所述第一网络切片选择辅助信息判断所述源核心网控制面设备不能继续服务所述终端设备，包括：
    所述源核心网控制面设备确定所述第一网络切片选择辅助信息所关联的切片类型或者业务类型不在所述第二网络切片选择辅助信息所关联的切片类型或者业务类型范围之内，则判断所述源核心网控制面设备不能继续服务所述终端设备。
  8. 根据权利要求3所述的方法，其特征在于，所述源核心网控制面设备无法确定所述第一网络切片选择辅助信息所索引的目标核心网控制面设备，包括：
    所述源核心网控制面设备向缺省核心网控制面设备发送所述第一网络切片选择辅助 信息，以请求所述第一网络切片选择辅助信息所索引的目标核心网控制面设备；
    若请求失败，所述源核心网控制面设备无法确定第一网络切片选择辅助信息所索引的目标核心网控制面设备。
  9. 根据权利要求1至8任一所述的方法，其特征在于，所述源核心网控制面设备向所述终端设备发送所述第一网络切片选择辅助信息以及第一指示信息之后，所述方法还包括：
    所述源核心网控制面设备将所述终端设备从所述源核心网控制面设备去注册。
  10. 根据权利要求9所述的方法，其特征在于，所述源核心网控制面设备将所述终端设备从所述源核心网控制面设备去注册，包括：
    所述源核心网控制面设备删除所述源核心网控制面设备存储的所述终端设备的上下文信息。
  11. 一种核心网控制面设备选择方法，其特征在于，包括：
    终端设备从源核心网控制面设备接收第一网络切片选择辅助信息和第一指示信息，所述第一网络切片选择辅助信息用于索引目标核心网控制面设备，所述第一指示信息用于指示所述终端设备的临时标识无效；
    所述终端设备根据所述第一网络切片选择辅助信息和所述第一指示信息，向接入网设备发送第一注册请求消息；
    其中，所述第一注册请求消息携带所述第一网络切片选择辅助信息和所述终端设备的永久标识。
  12. 一种核心网控制面设备选择方法，其特征在于，包括：
    源核心网控制面设备判断是否能确定第一网络切片选择辅助信息，所述第一网络切片选择辅助信息用于索引目标核心网控制面设备；
    若所述源核心网控制面设备无法确定所述第一网络切片选择辅助信息，所述源核心网控制面设备向所述终端设备发送第三网络切片选择辅助信息以及第一指示信息，以触发所述终端设备发送第三注册请求消息，其中，所述第一指示信息用于指示所述终端设备的临时标识无效，所述第三网络切片选择辅助信息用于索引缺省核心网控制面设备，所述第三注册请求消息携带所述第三网络切片选择辅助信息和所述终端设备的永久标识。
  13. 根据权利要求12所述的方法，其特征在于，所述源核心网控制面设备向所述终端设备发送第三网络切片选择辅助信息以及第一指示信息之后，所述方法还包括：
    所述源核心网控制面设备将所述终端设备的临时标识设置为无效。
  14. 根据权利要求12或13所述的方法，其特征在于，所述源核心网控制面设备向所述终端设备发送第三网络切片选择辅助信息以及第一指示信息之后，所述方法还包括：
    所述源核心网控制面设备将所述终端设备从所述源核心网控制面设备去注册。
  15. 一种核心网控制面设备选择方法，其特征在于，包括：
    终端设备从源核心网控制面设备接收第三网络切片选择辅助信息和第一指示信息，所述第三网络切片选择辅助信息用于索引缺省核心网控制面设备，所述第一指示信息用于指示所述终端设备的临时标识无效；
    所述终端设备根据所述第三网络切片选择辅助信息和所述第一指示信息，向接入网设备发送第三注册请求消息；
    其中，所述第三注册请求消息携带所述第三网络切片选择辅助信息和所述终端设备的永久标识。
  16. 一种核心网控制面设备选择方法，其特征在于，包括：
    缺省核心网控制面设备从接入网设备接收第三注册请求消息，所述第三注册请求消息携带所述终端设备的永久标识；
    所述缺省核心网控制面设备根据所述永久标识向用户数据管理中心设备获取所述终端设备的签约数据；
    所述缺省核心网控制面设备根据所述签约数据确定所述终端设备的目标核心网控制面设备；
    所述缺省核心网控制面设备将所述终端设备重定向至所述目标核心网控制面设备。
  17. 根据权利要求16所述的方法，其特征在于，所述缺省核心网控制面设备将所述终端设备重定向至所述目标核心网控制面设备，包括：
    所述缺省核心网控制面设备向接入网设备发送第一重定向指示消息，所述第一重定向指示消息用于触发所述接入网设备将所述终端设备重定向至所述目标核心网控制面设备；或者，
    所述缺省核心网控制面设备向所述目标核心网控制面设备发送第二重定向指示消息，所述第二重定向指示消息用于触发所述目标核心网控制面设备完成所述终端设备的重定向。
  18. 一种核心网控制面设备选择装置，其特征在于，包括：
    获取模块，用于获取终端设备的第一网络切片选择辅助信息，
    发送模块，用于若所述源核心网控制面设备无法确定所述第一网络切片选择辅助信息所索引的目标核心网控制面设备，所述源核心网控制面设备向所述终端设备发送所述第一网络切片选择辅助信息以及第一指示信息，以触发所述终端设备发送第一注册请求消息，其中，所述第一指示信息用于指示所述终端设备的临时标识无效，所述第一注册请求消息携带所述第一网络切片选择辅助信息和所述终端设备的永久标识。
  19. 根据权利要求18所述的装置，其特征在于，所述装置还包括：
    临时标识设置模块，用于将所述终端设备的临时标识设置为无效。
  20. 根据权利要求18或19所述的装置，其特征在于，所述获取模块具体用于，
    从用户数据管理中心设备获取所述终端设备的签约数据；
    根据所述签约数据确定所述第一网络切片选择辅助信息。
  21. 根据权利要求18或19所述的装置，其特征在于，所述获取模块具体用于，
    从用户数据管理中心设备获取所述终端设备的签约数据；
    向缺省核心网控制面设备发送所述签约数据，以请求所述终端设备的第一网络切片选择辅助信息；
    从所述缺省核心网控制面设备接收所述第一网络切片选择辅助信息。
  22. 根据权利要求18至21任一项所述的装置，其特征在于，所述装置还包括：
    服务检测模块，用于根据所述第一网络切片选择辅助信息判断所述源核心网控制面设备不能继续服务所述终端设备。
  23. 根据权利要求22所述的装置，其特征在于，所述装置还包括：
    接收模块，用于从所述终端设备接收第二注册请求消息，所述第二注册请求消息携带第二网络切片选择辅助信息，所述第二网络切片选择辅助信息用于索引所述源核心网控制面设备；
    所述服务检测模块，具体用于所述源核心网控制面设备确定所述第一网络切片选择辅助信息所关联的切片类型或者业务类型不在所述第二网络切片选择辅助信息所关联的切片类型或者业务类型范围之内，则判断所述源核心网控制面设备不能继续服务所述终端设备。
  24. 根据权利要求20所述的装置，其特征在于，所述装置还包括：
    目标核心网控制面设备获取模块，用于向缺省核心网控制面设备发送所述第一网络切片选择辅助信息，以请求所述第一网络切片选择辅助信息所索引的目标核心网控制面设备；
    若请求失败，则确认所述源核心网控制面设备无法确定第一网络切片选择辅助信息所索引的目标核心网控制面设备。
  25. 根据权利要求18至24任一所述的装置，其特征在于，所述装置还包括：
    去注册模块，用于将所述终端设备从所述源核心网控制面设备去注册。
  26. 根据权利要求25所述的装置，其特征在于，所述去注册模块具体用于，删除所述源核心网控制面设备存储的所述终端设备的上下文信息。
  27. 一种核心网控制面设备选择装置，其特征在于，包括：
    接收模块，用于从源核心网控制面设备接收第一网络切片选择辅助信息和第一指示信息，所述第一网络切片选择辅助信息用于索引目标核心网控制面设备，所述第一指示信息用于指示所述终端设备的临时标识无效；
    发送模块，用于根据所述第一网络切片选择辅助信息和所述第一指示信息，向接入网设备发送第一注册请求消息；
    其中，所述第一注册请求消息携带所述第一网络切片选择辅助信息和所述终端设备的永久标识。
  28. 一种核心网控制面设备选择装置，其特征在于，包括：
    判断模块，用于判断是否能确定第一网络切片选择辅助信息，所述第一网络切片选择辅助信息用于索引目标核心网控制面设备；
    发送模块，用于若所述源核心网控制面设备无法确定所述第一网络切片选择辅助信息，所述源核心网控制面设备向所述终端设备发送第三网络切片选择辅助信息以及第一指示信息，以触发所述终端设备发送第三注册请求消息，其中，所述第一指示信息用于指示所述终端设备的临时标识无效，所述第三网络切片选择辅助信息用于索引缺省核心网控制面设备，所述第三注册请求消息携带所述第三网络切片选择辅助信息和所述终端设备的永久标识；
    临时标识设置模块，用于将所述终端设备的临时标识设置为无效；
    去注册模块，用于将所述终端设备从所述源核心网控制面设备去注册。
  29. 一种核心网控制面设备选择装置，其特征在于，包括：
    接收模块，用于从源核心网控制面设备接收第三网络切片选择辅助信息和第一指示信息，所述第三网络切片选择辅助信息用于索引缺省核心网控制面设备，所述第一指示信息用于指示所述终端设备的临时标识无效；
    发送模块，用于根据所述第三网络切片选择辅助信息和所述第一指示信息，向接入网设备发送第三注册请求消息；
    其中，所述第三注册请求消息携带所述第三网络切片选择辅助信息和所述终端设备的永久标识。
  30. 一种核心网控制面设备选择装置，其特征在于，包括：
    接收模块，用于从接入网设备接收第三注册请求消息，所述第三注册请求消息携带所述终端设备的永久标识；
    签约数据获取模块，用于根据所述永久标识向用户数据管理中心设备获取所述终端设备的签约数据；
    目标核心网控制面设备获取模块，用于根据所述签约数据确定所述终端设备的目标核心网控制面设备；
    发送模块，用于向接入网设备发送第一重定向指示消息，所述第一重定向指示消息用于触发所述接入网设备将所述终端设备重定向至所述目标核心网控制面设备；或者，所述缺省核心网控制面设备向所述目标核心网控制面设备发送第二重定向指示消息，所述第二重定向指示消息用于触发所述目标核心网控制面设备完成所述终端设备的重定向。
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