WO2023130858A1 - Système, procédé et appareil de communication et support de stockage - Google Patents

Système, procédé et appareil de communication et support de stockage Download PDF

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Publication number
WO2023130858A1
WO2023130858A1 PCT/CN2022/134823 CN2022134823W WO2023130858A1 WO 2023130858 A1 WO2023130858 A1 WO 2023130858A1 CN 2022134823 W CN2022134823 W CN 2022134823W WO 2023130858 A1 WO2023130858 A1 WO 2023130858A1
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WIPO (PCT)
Prior art keywords
amf
target
plmn
terminal device
source
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PCT/CN2022/134823
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English (en)
Chinese (zh)
Inventor
马泽芳
唐雄燕
苗守野
李红五
王光全
冯立华
李菲
张伦泳
马瑞涛
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中国联合网络通信集团有限公司
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Publication of WO2023130858A1 publication Critical patent/WO2023130858A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • 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

Definitions

  • the present application relates to the technical field of communication, and in particular to a communication system, method, device and storage medium.
  • the shared access network equipment is respectively connected to core network equipment of each operator.
  • the terminal device is connected to the core network device to which the terminal device belongs through the shared access network device.
  • the present application provides a communication system, method, device, and storage medium, which can realize the redirection of connected state terminal equipment among the networks of multiple operators during the process of multiple operators sharing the core network.
  • a communication system including: a terminal device, a source access network device, a source access and mobility management function AMF, a target AMF, and a target access network device; the source access network device and the source AMF belong to The first public land mobile network PLMN network; the target AMF belongs to the second PLMN network; the source AMF is connected to the target AMF through a communication interface; the source access network device is used to determine the frequency point information of the target access network device and send the information to the terminal The device sends frequency point information; the terminal device is used to determine the target access network device according to the frequency point information, and initiate a redirection request to the target access network device; the redirection request includes the first globally unique temporary identifier GUTI of the terminal device; The first GUTI is the GUTI of the terminal device in the first PLMN network; the target access network device is used to forward the redirection request to the target AMF; the target AMF is used to determine the first GUTI of the terminal device, and
  • the source access network device is specifically used to: determine the target PLMD ID; the target PLMN ID is the PLMN ID that needs to be selected when the terminal device accesses the second PLMN network ; Determine the frequency point information of the PLMN network corresponding to the target PLMN ID as the frequency point information of the target access network device.
  • the target AMF is further configured to send a first request message to the source AMF; the first request message is used to request the context information of the terminal device and the user permanent identifier SUPI; the source AMF The AMF is used to send the first response message to the target AMF according to the first request message; the first response message includes the context information and SUPI of the terminal device; the target AMF is also used to determine the terminal device according to the SUPI, and provide the terminal device with the context information Create context.
  • the target AMF is specifically configured to: parse the first GUTI, determine the globally unique AMF identifier GUAMI in the first GUTI; determine the AMF represented by the GUAMI as the source AMF.
  • the source AMF is further configured to send a PLMN list to the source access network device;
  • the PLMN list includes at least one of the following: the HPLMN of the terminal device, the serving PLMN, etc.
  • the effective public land mobile network EPLMN is the PLMN selected last time; the source access network device is also used to determine the target PLMN from the PLMN list.
  • the source access network device is specifically used to: determine the current service PLMN ID of the terminal device according to the PLMN list; determine the service PLMN ID of the terminal device according to the service PLMN ID of the terminal device. Home network; determine that the PLMN ID of the home network of the terminal device in the second PLMN network is the first PLMN ID; determine that the first PLMN ID is the target PLMN ID.
  • the source AMF is further configured to send a mobility restriction list to the source access network device; the mobility restriction list is used to indicate the first PLMN ID; the first PLMN ID is The PLMN ID of the home network of the terminal device in the second PLMN network; the source access network device is configured to receive the mobility restriction list, and determine that the first PLMN ID indicated by the mobility restriction list is the target PLMN ID.
  • the source AMF is specifically configured to: determine the location information of the terminal device; determine the PLMN adjacent to the first PLMN network at the location represented by the location information of the terminal device The network is the second PLMN network; determine the PLMN ID that allows the terminal device to access the network in the second PLMN network; determine that the PLMN ID that allows the terminal device to access the network is the first PLMN ID.
  • the source access network device is further configured to: determine an access network device adjacent to the source access network device in the second PLMN network as the target access network device ; Determine the frequency point information of the target access network device.
  • the target access network device is also used to: obtain the target PLMN ID, the location information of the terminal device, and the slice information requested by the terminal device; according to the target PLMN ID, the terminal The location information of the device and the slice information requested by the terminal device determine the target AMF.
  • the source AMF is further configured to send the first slice indication information to the target AMF; the first slice indication information is used to indicate the first slice information, and the first slice The slice information is the slice information of the terminal device in the home network.
  • the source AMF is specifically configured to: determine the first slice information when the PLMN IDs of the source AMF and the target AMF are different; according to the first slice information, A first slice indication message is generated.
  • the first indication information is specifically used to indicate slice information of the terminal device in the first PLMN network, and slice information of the mapped terminal device in the first network in the home network. At least one item of slice information; the target AMF is specifically used to: determine that the slice information of the terminal device in the first PLMN network is the first slice information when the first PLMN network is the home network; If the network is not the home network, it is determined that the slice information of the mapped terminal device in the first network in the home network is the first slice information.
  • the target AMF is further configured to: determine the first slice information; determine the second slice information mapped to the first slice information in the second PLMN network; according to the first slice information Two slice information, and at least one item of the location information of the terminal equipment, determine the target session management function SMF; the target SMF is the SMF in the second PLMN network.
  • the target AMF is further configured to send a registration status update message to the source AMF; the registration status update message is used to instruct the source AMF to release the preset session; the preset session is the source AMF The target AMF established for the terminal device does not support the session; the source AMF is also used to release the preset session in response to the registration status update message.
  • the system further includes: the home unified data management function UDM; the target AMF is also configured to send a context request message to the home UDM; the context request message is used to request the terminal to UDM The subscription data of the device; the UDM is used to send the subscription data of the terminal device to the target AMF in response to the context request message.
  • the target AMF is further configured to obtain the subscription data of the terminal device from the source AMF through a communication interface.
  • the system further includes: a target network slice selection function NSSF; the target AMF is also configured to initiate a query to the target NSSF according to the first slice information, and determine the second slice information , and a list of AMFs that support the second slice information.
  • NSSF target network slice selection function
  • the target AMF is further configured to query the slice mapping relationship configured in the target AMF according to the first slice information, determine the second slice information, and support the second slice information AMF list.
  • the system further includes: a first AMF; a target AMF, and is also used to: determine whether the target AMF is included in the AMF list; the first AMF is an AMF in the AMF list; If not included, determine the first AMF according to the AMF list.
  • the target AMF is further configured to send first indication information to the target access network device, where the first indication information includes at least one of the following: an identifier of the first AMF, a registration The request message, the second slice information; the target access network device, configured to generate second indication information according to the first indication information, and send the second indication information to the first AMF;
  • the second indication information includes at least one of the following: first The identifier of the AMF, the registration request message, and the second slice information;
  • the first AMF is configured to determine at least one of the identifier of the first AMF, the registration request message, and the second slice information according to the second indication information.
  • the target AMF is further configured to send third indication information to the first AMF;
  • the third indication information includes at least one of the following: a registration request message, the SUPI of the terminal device, The context of the terminal device, the second slice information;
  • the first AMF is configured to determine at least one of the registration request message, the SUPI of the terminal device, the context of the terminal device, and the second slice information according to the third indication information.
  • the system further includes: a home SMF and a home policy control function PCF; the home SMF is further configured to send fourth indication information to the home PCF; the fourth indication information is used to instructing to perform SM policy management; and instructing the home PCF of the location information of the terminal equipment.
  • the target AMF is further configured to send fifth indication information to the target access network device, where the fifth indication information is used to indicate the PLMN list and the at least one.
  • a communication method is provided, which is applied in a communication system.
  • the communication system includes: a terminal device, a source access network device, a source access and mobility management function AMF, a target AMF, and a target access network device;
  • the network access device and the source AMF belong to the first public land mobile network PLMN network;
  • the target AMF belongs to the second PLMN network;
  • the source AMF and the target AMF are connected through a communication interface;
  • the method includes: the target AMF receives the information from the target access network device A redirection request;
  • the redirection request includes the first globally unique temporary identifier GUTI of the terminal device;
  • the first GUTI is the GUTI of the terminal device in the first PLMN network;
  • the target AMF determines the first GUTI of the terminal device according to the redirection request, and
  • the source AMF is determined according to the first GUTI;
  • the target AMF sends a session information request message to the source AMF;
  • obtaining the session information of the terminal device from the source AMF includes: the target AMF sends a first request message to the source AMF; the first request message is used to request the context of the terminal device information and user permanent identifier SUPI; the target AMF receives the first response message from the source AMF; the first response message includes the context information of the terminal device and SUPI; the target AMF determines the terminal device according to the SUPI, and creates a context for the terminal device according to the context information .
  • determining the source AMF according to the first GUTI includes: the target AMF parses the first GUTI, and determines the globally unique AMF identifier GUAMI in the first GUTI; the target AMF determines the GUAMI represented by The AMF is the source AMF.
  • the method further includes: the target AMF sends a registration status update message to the source AMF; the registration status update message is used to indicate the source AMF Release the preset session; the preset session is a session not supported by the target AMF established by the source AMF for the terminal device.
  • the method further includes: the target AMF sends a context request message to the home unified data management function UDM; the context request message It is used to request the subscription data of the terminal equipment from the UDM; the target AMF receives the subscription data of the terminal equipment from the UDM.
  • the method further includes: the target AMF acquires the subscription data of the terminal device from the source AMF through the communication interface.
  • the method further includes: the target AMF initiates a query to the target network slice selection function NSSF according to the first slice information, determines the second slice information, and supports the second slice information AMF list, the first slice information is the slice information of the terminal device in the home network.
  • the method further includes: the target AMF determines whether the target AMF is included in the AMF list; the first AMF is an AMF in the AMF list; if not included, the target AMF determines the first AMF according to the AMF list.
  • the method further includes: the target AMF sends first indication information to the target access network device, so that the target AMF The network access device forwards at least one item of the identifier of the first AMF, the registration request message, and the second slice information to the first AMF according to the first indication information.
  • the method further includes: the target AMF sends third indication information to the first AMF; the third indication information includes the following At least one item: registration request message, SUPI of the terminal device, context of the terminal device, and second slice information.
  • the method further includes: the target AMF sends fifth indication information to the target access network device, the fifth indication information is used to indicate the PLMN list, and the mobility restriction list at least one of the .
  • a communication method is provided, which is applied in a communication system.
  • the communication system includes: a terminal device, a source access network device, a source access and mobility management function AMF, a target AMF, and a target access network device;
  • the network access device and the source AMF belong to the first public land mobile network PLMN network;
  • the target AMF belongs to the second PLMN network;
  • the source AMF and the target AMF are connected through a communication interface;
  • the method includes: the source access network device determines the target access network The frequency point information of the device, and send the frequency point information to the terminal device;
  • the frequency point information of the target access network device is used to instruct the terminal device to access the target access network device according to the frequency point information, and send the terminal device through the target access network device
  • the device sends a redirection request.
  • the source access network device determines the frequency point information of the target access network device, including: the source access network device determines the target PLMD ID; the target PLMN ID is the terminal device The PLMN ID that needs to be selected when accessing the second PLMN network; the source access network device determines that the frequency point information of the PLMN network corresponding to the target PLMN ID is the frequency point information of the target access network device.
  • the method further includes: the source access network device receives the PLMN list from the source AMF; the PLMN list Including at least one of the following: HPLMN of the terminal device, serving PLMN, equivalent public land mobile network EPLMN, and the PLMN selected last time; the source access network device determines the target PLMN from the PLMN list.
  • the source access network device determines the target PLMN from the PLMN list, including: the source access network device determines the current service PLMN ID of the terminal device according to the PLMN list; The network access device determines the home network of the terminal device according to the service PLMN ID of the terminal device; the source access network device determines that the PLMN ID of the home network of the terminal device in the second PLMN network is the first PLMN ID; the source access network device determines The first PLMN ID is the target PLMN ID.
  • the method further includes: the source access network device receives the mobility restriction list from the source AMF;
  • the mobility restriction list is used to indicate the first PLMN ID;
  • the first PLMN ID is the PLMN ID of the home network of the terminal device in the second PLMN network;
  • the source access network device determines that the first PLMN ID indicated by the mobility restriction list is the target PLMN ID.
  • the source access network device determines the frequency point information of the target access network device, including: the source access network device determines that the source access network device in the second PLMN network The adjacent access network device is the target access network device; the source access network device determines the frequency point information of the target access network device.
  • a communication method is provided, which is applied in a communication system.
  • the communication system includes: a terminal device, a source access network device, a source access and mobility management function AMF, a target AMF, and a target access network device;
  • the network access device and the source AMF belong to the first public land mobile network PLMN network;
  • the target AMF belongs to the second PLMN network;
  • the source AMF and the target AMF are connected through a communication interface;
  • the method includes: the source AMF receives a session information request from the target AMF message; wherein, the source AMF is the AMF determined by the target AMF according to the first GUTI of the terminal device; the source AMF sends the session information of the terminal device to the target AMF in response to the session request message.
  • the method further includes: the source AMF sends a PLMN list to the source access network device; the PLMN list includes at least one of the following: the HPLMN of the terminal device, the serving PLMN, etc. Effective public land mobile network EPLMN, the PLMN selected last time.
  • the method further includes: the source AMF sends a mobility restriction list to the source access network device; the mobility restriction list is used to indicate the first PLMN ID; the first PLMN ID It is the PLMN ID of the home network of the terminal device in the second PLMN network.
  • the method further includes: the source AMF determines the location information of the terminal device, and the source AMF determines At the location represented by the location information of the device, the PLMN network adjacent to the first PLMN network is the second PLMN network; the source AMF determines the PLMN ID that allows the terminal device to access the network in the second PLMN network; the source AMF determines that the terminal device is allowed to access the network
  • the PLMN ID for accessing the network is the first PLMN ID.
  • the method further includes: the source AMF sends first slice indication information to the target AMF; the first slice indication information is used to indicate the first slice information, and the first The slice information is the slice information of the terminal device in the home network.
  • the method further includes: when the PLMN IDs of the source AMF and the target AMF are different, determining the first slice information; generating the first slice information according to the first slice information.
  • a slice indicates a message.
  • the first indication information is specifically used to indicate slice information of the terminal device in the first PLMN network, and slice information of the mapped terminal device in the first network in the home network. At least one item of slice information.
  • the method further includes: the source AMF receives a registration status update message from the target AMF; the registration status update message is used to instruct the source AMF to release the preset session; the preset session is A session not supported by the target AMF established for the terminal device in the source AMF; the source AMF releases the preset session in response to the registration status update message.
  • a communication device which is applied in a communication system.
  • the communication system includes: a terminal device, a source access network device, a source access and mobility management function AMF, a target AMF, and a target access network device;
  • the network access device and the source AMF belong to the first public land mobile network PLMN network;
  • the target AMF belongs to the second PLMN network;
  • the source AMF and the target AMF are connected through a communication interface;
  • the device includes: a communication unit and a processing unit, a communication unit, Based on the redirection request from the target access network device;
  • the redirection request includes the first globally unique temporary identifier GUTI of the terminal device;
  • the first GUTI is the GUTI of the terminal device in the first PLMN network;
  • the processing unit is configured to The directional request determines the first GUTI of the terminal device, and determines the source AMF according to the first GUTI;
  • the communication unit is also used to send a session information request message to
  • the processing unit is specifically configured to: instruct the communication unit to send a first request message to the source AMF; the first request message is used to request the context information and the permanent user ID of the terminal device Symbol SUPI; indicates that the communication unit receives the first response message from the source AMF; the first response message includes the context information of the terminal device and SUPI; determine the terminal device according to the SUPI, and create a context for the terminal device according to the context information.
  • the processing unit is specifically configured to: parse the first GUTI, determine the globally unique AMF identifier GUAMI in the first GUTI; determine the AMF represented by the GUAMI as the source AMF.
  • the communication unit is further configured to send a registration status update message to the source AMF; the registration status update message is used to instruct the source AMF to release the preset session; the preset session is the source AMF A session not supported by the target AMF established for the end device.
  • the communication unit is also used to send a context request message to the unified data management function UDM; the context request message is used to request the subscription data of the terminal device from the UDM; the target AMF receives the message from Subscription data of UDM terminal equipment.
  • the processing unit is further configured to instruct the communication unit to acquire the subscription data of the terminal device from the source AMF through the communication interface.
  • the processing unit is further configured to initiate a query to the target network slice selection function NSSF according to the first slice information, determine the second slice information, and support the second slice information In the AMF list, the first slice information is the slice information of the terminal device in the home network.
  • the processing unit is further configured to determine whether the target AMF is included in the AMF list; the first AMF is an AMF in the AMF list; if not included, determine the first AMF according to the AMF list One AMF.
  • the communication unit is further configured to send the first indication information to the target access network device, so that the target access network device forwards to the first AMF according to the first indication information At least one item of the identifier of the first AMF, the registration request message, and the second slice information.
  • the communication unit is further configured to send third indication information to the first AMF;
  • the third indication information includes at least one of the following: a registration request message, the SUPI of the terminal device, The context of the terminal device, the second slice information.
  • the communication unit is further configured to send fifth indication information to the target access network device, where the fifth indication information is used to indicate the PLMN list and the at least one.
  • a communication device which is applied in a communication system.
  • the communication system includes: a terminal device, a source access network device, a source access and mobility management function AMF, a target AMF, and a target access network device;
  • the network access device and the source AMF belong to the first public land mobile network PLMN network;
  • the target AMF belongs to the second PLMN network;
  • the source AMF and the target AMF are connected through a communication interface;
  • the device includes: a communication unit, and a processing unit; the processing unit, Used to determine the frequency point information of the target access network device, the communication unit is used to send the frequency point information to the terminal device;
  • the frequency point information of the target access network device is used to instruct the terminal device to access the target access network according to the frequency point information device, and send a redirection request to the terminal device through the target access network device.
  • the processing unit is also used to: determine the target PLMD ID; the target PLMN ID is the PLMN ID that needs to be selected when the terminal device accesses the second PLMN network; determine the target The frequency point information of the PLMN network corresponding to the PLMN ID is the frequency point information of the target access network device.
  • the communication unit is further configured to receive a PLMN list from the source AMF; the PLMN list includes at least one of the following: HPLMN of the terminal device, serving PLMN, equivalent public land mobile Network EPLMN, the PLMN selected last time; the processing unit is also used to determine the target PLMN from the PLMN list.
  • the processing unit is further configured to: determine the current service PLMN ID of the terminal device according to the PLMN list; the source access network device determines the terminal device according to the service PLMN ID of the terminal device The home network of the device; determine that the PLMN ID of the home network of the terminal device in the second PLMN network is the first PLMN ID; determine that the first PLMN ID is the target PLMN ID.
  • the communication unit is further configured to receive a mobility restriction list from the source AMF; the mobility restriction list is used to indicate the first PLMN ID; the first PLMN ID is the terminal device The PLMN ID of the home network in the second PLMN network; the processing unit is further configured to determine that the first PLMN ID indicated by the mobility restriction list is the target PLMN ID.
  • the processing unit is further configured to: determine an access network device adjacent to the source access network device in the second PLMN network as the target access network device; determine the target access network device; Frequency point information of access network equipment.
  • a communication device which is applied in a communication system.
  • the communication system includes: a terminal device, a source access network device, a source access and mobility management function AMF, a target AMF, and a target access network device;
  • the network access device and the source AMF belong to the first public land mobile network PLMN network;
  • the target AMF belongs to the second PLMN network;
  • the source AMF and the target AMF are connected through a communication interface;
  • the device includes: a communication unit and a processing unit; the processing unit uses Instructing the communication unit to receive the session information request message from the target AMF; wherein, the source AMF is the AMF determined by the target AMF according to the first GUTI of the terminal device;
  • the processing unit is also used to instruct the communication unit to respond to the session request message to the target AMF Send the session information of the terminal device.
  • the apparatus further includes: a processing unit, further configured to instruct the communication unit to send the PLMN list to the source access network device;
  • the PLMN list includes at least one of the following items: the terminal device HPLMN, Serving PLMN, Equivalent Public Land Mobile Network EPLMN, PLMN selected last time.
  • the processing unit is further configured to instruct the communication unit to send a mobility restriction list to the source access network device; the mobility restriction list is used to indicate the first PLMN ID; the first The PLMN ID is the PLMN ID of the home network of the terminal device in the second PLMN network.
  • the processing unit is further configured to: determine the location information of the terminal device; determine the PLMN adjacent to the first PLMN network at the position represented by the location information of the terminal device The network is the second PLMN network; determine the PLMN ID that allows the terminal device to access the network in the second PLMN network; determine that the PLMN ID that allows the terminal device to access the network is the first PLMN ID.
  • the apparatus further includes: a processing unit, further configured to instruct the communication unit to send the first slice indication information to the target AMF; the first slice indication information is used to indicate the first slice indication information There is slice information, and the first slice information is slice information of the terminal device in the home network.
  • the processing unit is further configured to: determine the first slice information when the PLMN IDs of the source AMF and the target AMF are different; according to the first slice information, A first slice indication message is generated.
  • the first indication information is specifically used to indicate slice information of the terminal device in the first PLMN network, and slice information of the mapped terminal device in the first network in the home network. At least one item of slice information.
  • the processing unit is further configured to: instruct the communication unit to receive a registration status update message from the target AMF; the registration status update message is used to instruct the source AMF to release the preset session; Let the session be a session established for the terminal device in the source AMF that is not supported by the target AMF; and release the preset session in response to the registration status update message.
  • the present application provides a communication device, the communication device includes: a processor and a communication interface; the communication interface is coupled to the processor, and the processor is used to run computer programs or instructions to implement the first aspect and the first aspect The communication method described in any possible implementation manner of .
  • the present application provides a communication device, the communication device includes: a processor and a communication interface; the communication interface is coupled to the processor, and the processor is used to run computer programs or instructions to implement the second aspect and the second aspect The communication method described in any possible implementation manner of .
  • the present application provides a communication device, the communication device includes: a processor and a communication interface; the communication interface is coupled to the processor, and the processor is used to run computer programs or instructions to implement the third aspect and the third aspect The communication method described in any possible implementation manner of .
  • the present application provides a computer-readable storage medium, where instructions are stored in the computer-readable storage medium, and when the instructions in the computer-readable storage medium are executed by the processor of the communication device, the communication device can execute The communication method as described in the first aspect and any possible implementation manner of the first aspect.
  • the present application provides a computer-readable storage medium, where instructions are stored in the computer-readable storage medium, and when the instructions in the computer-readable storage medium are executed by the processor of the communication device, the communication device can execute The communication method as described in the second aspect and any possible implementation manner of the second aspect.
  • the present application provides a computer-readable storage medium, where instructions are stored in the computer-readable storage medium, and when the instructions in the computer-readable storage medium are executed by the processor of the communication device, the communication device can execute Such as the communication method described in the third aspect and any possible implementation manner of the third aspect.
  • source AMFs and target AMFs of different operators communicate through a communication interface (for example, the communication interface may be an N14+ interface).
  • the source access network device indicates the frequency point of the target access network device to the terminal device by discovering the frequency point of the target access network device, so that the terminal device can Access to the target access network device according to the frequency point information.
  • the target AMF discovers the source AMF according to the GUTI of the terminal device, and obtains the session information of the terminal device from the source AMF.
  • the target AMF can create a session for the terminal device in the second PLMN network according to the session information of the terminal device, so that the terminal device can be redirected to the second PLMN network. In this way, the redirection of connected terminal devices among the networks of multiple operators is realized.
  • Fig. 1 is a system architecture diagram of a kind of MOCN system provided by the embodiment of the present application.
  • FIG. 2 is a system architecture diagram of a communication system provided by an embodiment of the present application.
  • FIG. 3 is a schematic diagram of a scenario when multiple operators share an access network and a core network according to an embodiment of the present application
  • FIG. 4 is a system architecture diagram of another communication system provided by an embodiment of the present application.
  • FIG. 5 is a flowchart of a communication method provided by an embodiment of the present application.
  • FIG. 6 is a schematic flowchart of a redirection method when a terminal device moves from a first area to a second area according to an embodiment of the present application
  • FIG. 7 is a schematic flowchart of a redirection method when a terminal device moves from a second area to a first area according to an embodiment of the present application
  • FIG. 8 is a schematic flowchart of a redirection method when a terminal device moves from a second area to a third area according to an embodiment of the present application
  • FIG. 9 is a schematic structural diagram of a communication device provided by an embodiment of the present application.
  • FIG. 10 is a schematic structural diagram of another communication device provided by an embodiment of the present application.
  • FIG. 11 is a schematic structural diagram of another communication device provided by an embodiment of the present application.
  • first and second in the specification and drawings of the present application are used to distinguish different objects, or to distinguish different processes for the same object, rather than to describe a specific sequence of objects.
  • the network coverage is more dense, the number of base stations is also increasing, and the network construction cost of operators is also increasing.
  • a network sharing method is currently proposed. In this method, multiple operators share the same network, thereby reducing the redundant construction of communication networks, saving the overall investment of the network, and alleviating the huge cost of network construction. .
  • the shared network architecture supporting 5G MOCN is specified in the 3GPP R16 protocol specification.
  • terminal devices are supported to share 5G access networks (RAN) of different operators.
  • RAN 5G access networks
  • the network architecture of MOCN is shown in Figure 1.
  • the MOCN system 10 includes a core network device 101 of operator A, a core network device 102 of operator B, a core network device 103 of operator C, a core network device 104 of operator X, and an operator The access network device 105 of X.
  • the access network equipment 105 of operator X is connected to the core network equipment 101 of operator A, the core network equipment 102 of operator B, and the core network equipment 103 of operator C through interfaces N2 and N3 respectively.
  • the access network device 105 of operator X is used to access the terminal equipment of operator A, operator B and operator C, and forward the data of the terminal equipment to the corresponding operator's core network equipment.
  • the access network equipment broadcasts the public land mobile network (public land mobile network, PLMN) identification (Identity, ID).
  • PLMN public land mobile network
  • the access network equipment sharing the network will carry the PLMN ID of the core network of each operator sharing the access network equipment in the broadcast system message.
  • the access network equipment of the shared network carries the PLMN IDs of operator A and operator X respectively in the broadcast system information.
  • Each PLMN ID corresponds to an operator's core network.
  • the terminal device After receiving the broadcast system message, the terminal device parses the system message and determines the PLMN ID carried in the system message. The terminal device determines the core network to which the access network device of the shared network is connected according to the PLMN ID, and selects the PLMN ID of the network to which the terminal device belongs. The terminal device notifies the access network device of the shared network of the selected PLMN ID. After receiving the PLMN ID selected by the terminal device, the access network device of the shared network routes the service data of the terminal device to the core network selected by the terminal device according to the PLMN ID selected by the terminal device.
  • the access network equipment of operator X carries the core network identifier PLMN-ID(A) of operator A and the core network identifier PLMN-ID of operator B in the broadcast system message.
  • the core network identifier PLMN-ID(X) of operator X is also carried. Since the access network equipment of the operator X carries the PLMN-ID(X) in the broadcasted system message, it belongs to the conventional broadcasting method, not the broadcasting method of the shared network. Therefore, FIG. 1 and Table 1 do not show the situation that the terminal equipment of operator X performs network sharing.
  • the access network built by operator A carries the PLMN ID of operator B in the broadcast system message, so that the terminal of operator B The device is connected to the access network of operator A; at the same time, the system message will also carry the PLMN ID of operator A so that the terminal equipment of operator A can also access the access network of operator A.
  • the access network built by operator X carries the PLMN ID of operator A in the broadcast system message, so that the terminal equipment of operator A can access the access network of operator X; at the same time, the system message will also include Carry the PLMN ID of operator X so that the terminal equipment of operator X can also access the access network of operator X.
  • the terminal device In the MOCN sharing mode, the terminal device needs to select the core network according to the PLMN ID broadcast by the access network device of the shared network. Therefore, the number of PLMN IDs broadcast by the access network equipment sharing the network needs to be the same as the number of 5G core networks sharing the access network. Therefore, the access network device of the shared network must broadcast multiple PLMN IDs so that all terminal devices can access the access network.
  • the maximum number of shared operators carried in the system message broadcast by the access network device of the shared access network is N-1.
  • N is a positive integer.
  • the terminal device has the shortest time delay when selecting a PLMN (the specific time delay is determined according to the selection sequence of the PLMN ID of the terminal device) and the time for the terminal device to select a network to reside is the shortest.
  • the time delay required for selecting the PLMN and network selection and staying in this method is the shortest .
  • MOCN shared access network has at least the following advantages: under the framework of MOCN shared access network, the core networks of different operators are completely independently set up, and it has better support for 5G special services such as network slicing and edge computing.
  • Fig. 2 is a communication system 20 provided by the embodiment of the present application.
  • the communication system provided by the embodiment of the present application includes: a first access network device 201, a first core network device 202, at least one second core network The device 203 and the terminal device 204.
  • the first access network device 201 is configured to implement a function of a wireless access network, and provide wireless access services for terminal devices.
  • the first access network device 201 is the access network device of the contractor operator.
  • the access network equipment of operator X For example, the access network equipment of operator X.
  • the first core network device 202 is the core network device of the contractor operator.
  • core network equipment of operator X For example, core network equipment of operator X.
  • the first core network equipment 202 is used to implement functions related to the core network and provide business services related to the core network.
  • the first core network device 202 for the terminal device of the shared operator is used to provide a data routing function, and route the service data of the terminal device to the home core network of the terminal device. At this time, the first core network device 202 may also perform access control, policy control, network selection, and charging settlement on the terminal device.
  • the second core network device 203 is the core network device of the sharing party operator, and is used for the terminal equipment of the sharing party operator to implement functions related to the core network. For example, to provide data processing or forwarding functions.
  • At least one second core network device 203 includes a core network device 2031 of operator A, a core network device 2032 of operator B, and a core network device 2033 of operator C as an example for illustration.
  • the core network equipment 2031 of operator A is used to provide core network-related business services for terminal equipment of operator A;
  • the core network equipment 2032 of operator B is used to provide core network-related services for terminal equipment of operator B Service:
  • the core network equipment 2033 of operator C is used to provide core network-related business services for terminal equipment of operator C.
  • the terminal device 204 is a device that needs to provide communication services, and may be a terminal device that belongs to the same operator as the first access network device 201 and the first core network device 202 .
  • the terminal device 204 may also be a terminal device that belongs to the same operator as any second core network device 203 in the at least one second core network device 203 .
  • description is mainly made by taking the terminal device as an example that belongs to the same operator as any one of the second core network devices 203 in the at least one second core network device 203 .
  • the core network equipment in the embodiment of this application mainly refers to the 5G core network equipment.
  • FIG. 3 is a schematic diagram of a scenario when multiple operators share an access network and a core network according to an embodiment of the present application.
  • the coverage scenario includes core network equipment 301 of operator A, core network equipment 302 of operator X, core network equipment 303 of operator Y, access network equipment 304 of operator A, operator X
  • the description is mainly made by taking the terminal device belonging to the operator A as an example.
  • operator A, operator X and operator Y may share the access network and the core network.
  • the terminal device moves within the coverage of the access network device 304 of operator A, the access network device 305 of operator X, and the access network device 306 of operator Y, it can respectively access the Access network equipment and core network equipment provide network communication services.
  • the access network device 304 of operator A is connected to the core network device 301 of operator A through N1/N2/N3 interfaces.
  • the access network device 305 of operator X is connected to the core network device 302 of operator X through the N1/N2/N3 interface; the core network device 302 of operator X is connected through the N9/N16/N8/N12/N24/N32/N14+ interface Connect to the core network device 301 of operator A.
  • the access network device 306 of operator Y is connected to the core network device 303 of operator Y through the N1/N2/N3 interface; the core network device 303 of operator Y is connected through the N9/N16/N8/N12/N24/N32/N14+ interface Connect to the core network device 301 of operator A.
  • the coverage area of the access network equipment 304 of operator A is denoted as the first area; the coverage area of the access network equipment 305 of operator X is denoted as the second area; the coverage area of the access network equipment 306 of operator Y is denoted as third area.
  • the terminal device 307 When the terminal device 307 moves to the first area, it can access the access network device 304 of the operator A, and access the core network device 301 of the operator A through the access network device 304 of the operator A.
  • the terminal device When the terminal device moves to the second area, it can access the access network equipment 305 of operator X, access the core network equipment 302 of operator X through the access network equipment 305 of operator X, and access the core network equipment 302 of operator X through the core network equipment of operator X.
  • the device 302 accesses the core network device 301 of operator A.
  • the terminal device When the terminal device moves to the third area, it can access the access network equipment 306 of operator Y, access the core network equipment 303 of operator Y through the access network equipment 306 of operator Y, and access the core network equipment 303 of operator Y through the core network equipment of operator Y.
  • the device 303 accesses the core network device 301 of operator A.
  • the terminal equipment and the core network equipment of the access network equipment all need to perform corresponding action processes and realize corresponding functions, so as to realize that the terminal equipment in the connected state can operate in multiple Redirection between carrier networks.
  • Scenario 1 the process of the access network device broadcasting the PLMN ID
  • Scenario 2 the process of the access network device selecting the target PLMN ID and the frequency of the target access network device
  • Scenario 3 the access network of different operators Interconnection and interaction between network equipment and core network equipment.
  • Scenario 1 The process of the access network device broadcasting the PLMN ID.
  • the access network device In order for the access network device to be able to notify the terminal device of the PLMN network supported by the access network device, it needs to broadcast the PLMN ID to the terminal device.
  • the access network device can use any of the following schemes 1 to 3 when broadcasting the PLMN ID.
  • the scheme broadcasts the PLMN ID.
  • scheme 1, scheme 2, and scheme 3 respectively:
  • Solution 1 The access network device broadcasts the original PLMN ID of the core network for each core network connected to the access network device.
  • the PLMN ID of each core network is the same as the PLMN ID broadcast for the core network in the network of the operator to which it belongs. That is to say, in solution 1, the access network device broadcasts the PLMN ID of each core network in the same way as the MOCN broadcasts the PLMN ID in the related technology.
  • scheme 1 to broadcast the PLMN ID brings at least the following beneficial effects: when the terminal device obtains the PLMN ID, the time delay required for selecting the PLMN (for example, when the terminal device is powered on or recovers from a non-coverage area) is the shortest.
  • the access network equipment broadcasts the PLMN ID of each core network in the same way as MOCN broadcasts the PLMN ID in the related technology, and there is no need to create a new network number, which will not cause waste of network number resources.
  • the maximum number of PLMN IDs of the shared operator's core network that the access network device can broadcast is N-1.
  • N is the maximum number of broadcast PLMN IDs that the access network equipment can support, and N is a positive integer.
  • the access network device broadcasts a new PLMN ID for each core network connected to the access network device.
  • the new PLMN ID of each core network is different from the PLMN ID broadcast for the core network in the own network of the operator to which it belongs.
  • the access network device can combine the PLMN ID of the contractor operator and the PLMN ID of the shared operator to obtain the PLMN ID of each core network.
  • Adopting scheme 2 to broadcast the PLMN ID brings at least the following beneficial effects: the access network device can customize and broadcast a new PLMN ID. In this way, after the terminal device receives the new PLMN ID, it can determine according to the new PLMN ID that the access network is an access network undertaken by operator X that can be shared. In addition, the terminal device can also display the network identification of the contractor operator and the network identification of the sharing operator on the display interface at the same time according to the new PLMN ID.
  • the maximum number of PLMN IDs of the shared operator's core network that the access network device can broadcast is N-1.
  • the access network device broadcasts the same PLMN ID for each core network connected to the access network device.
  • the access network device only broadcasts the PLMN ID of the core network of operator X.
  • the access network device only broadcasts the new PLMN ID (XY) of the core network of operator X.
  • Adopting scheme 3 to broadcast the PLMN ID brings at least the following beneficial effects: the access network device only needs to broadcast one PLMN ID, which reduces the signaling overhead of the access network device.
  • the access network device only broadcasts the PLMN ID of the core network of operator X, it will not cause waste of network number resources.
  • solution 3 because the access network equipment does not broadcast the PLMN ID of each operator, therefore, in solution 3, it is necessary to increase the first core network equipment to determine the home network of the terminal device without the PLMN ID selected by the terminal device.
  • Function For example, a function of the first core network device identifying a subscriber permanent identifier (Subscription Permanent Identifier, SUPI) or HPLMN of the terminal device is extended.
  • SUPI Subscriber permanent Identifier
  • HPLMN the terminal device also needs to have the function of reporting SUPI or HPLMN.
  • the access network device broadcasts the PLMN ID by broadcasting the first system message, and the first system message carries the PLMN ID that the terminal device needs to broadcast.
  • the source access network device selects the target PLMN ID and the frequency of the target access network device.
  • the source access network device may determine the frequency of the target access network device through the following method 1; determine the target PLMN ID through any of the following methods 2 and 5. Instructions are given below:
  • the source access network device configures the frequency of the target access network device based on the PLMN ID.
  • the terminal device is an access network device of operator A as an example for description.
  • Mode 1.1 For the source access network equipment of operator A, when the source access network equipment is a base station at the boundary between the first area and the second area.
  • the source access network device determines that the PLMN ID used by the terminal device to access operator X is the PLMN-ID (XA) in scheme 2 (it can also be the PLMN ID in other schemes).
  • the source access network device determines the frequency (or frequency point) F2 of the access network device of operator X adjacent to it. At this time, the source access network device determines that the target PLMN ID is PLMN-ID(XA), and the frequency of the target access network device is F2.
  • the source access network device determines that the PLMN ID used by the terminal device to access operator Y is the PLMN-ID (YA) in scheme 2 (it can also be the PLMN ID in other schemes).
  • the source access network device determines the frequency (or frequency point) F3 of the access network device of operator Y adjacent to it. At this time, the source access network device determines that the target PLMN ID is PLMN-ID(YA), and the frequency of the target access network device is F3.
  • Mode 1.2 For the source access network device of operator X, when the source access network device is a base station at the border between the second area and the first area. The source access network device determines that the PLMN ID used by the terminal device to access operator A is PLMN-ID(A). The source access network device determines the frequency (or frequency point) F1 of the access network device of operator A adjacent to it. At this time, the source access network device determines that the target PLMN ID is PLMN-ID(A), and the frequency of the target access network device is F1.
  • the source access network device determines that the PLMN ID used by the terminal device to access operator Y is the PLMN-ID (YA) in scheme 2 (it can also be the PLMN ID in other schemes).
  • the source access network device determines the frequency (or frequency point) F3 of the access network device of operator Y adjacent to it. At this time, the source access network device determines that the target PLMN ID is PLMN-ID(YA), and the frequency of the target access network device is F3.
  • Mode 1.3 For the source access network equipment of operator Y, when the source access network equipment is a base station at the boundary between the third area and the first area.
  • the source access network device determines that the PLMN ID used by the terminal device to access operator A is PLMN-ID(A).
  • the source access network device determines the frequency (or frequency point) F1 of the access network device of operator A adjacent to it.
  • the source access network device determines that the target PLMN ID is PLMN-ID(A), and the frequency of the target access network device is F1.
  • the source access network device determines that the PLMN ID used by the terminal device to access operator X is the PLMN-ID (XA) in scheme 2 (it can also be the PLMN ID in other schemes).
  • the source access network device determines the frequency (or frequency point) F2 of the adjacent operator X access network device. At this time, the source access network device determines that the target PLMN ID is PLMN-ID(XA), and the frequency of the target access network device is F2.
  • the source access network device can select the target PLMN ID according to the PLMN ID currently served by the terminal device and indicate it to the Access and Mobility Management Function (AMF).
  • AMF Access and Mobility Management Function
  • the source access network device can indicate the selected target PLMN ID and the cells under the target PLMN ID to the source AMF.
  • the source AMF can select the target AMF/mobility management entity (Mobility Management Entity, MME) mobility management entity MME according to the TAI information provided by the source access network device (this application mainly uses the target AMF as an example for illustration). Then, the source AMF sends the selected target PLMN ID to the target AMF/MME.
  • MME Mobility Management Entity
  • the source access network device can determine the current service PLMN ID of the terminal device, and determine the home network of the terminal device according to the service PLMN ID of the terminal device; the terminal device determines the home network of the terminal device
  • the PLMN ID in the second PLMN network is the first PLMN ID, and the terminal device determines that the first PLMN ID is the target PLMN ID.
  • the terminal equipment of operator A determines that the PLMN ID of the current service is PLMN ID (XA) (that is, the access network equipment adopts scheme 2 to broadcast the PLMN ID) .
  • the source access network device determines that the home network of the terminal device is the network of operator A according to the PLMN ID of the current service being the PLMN ID(XA).
  • the PLMN ID of operator A is PLMN ID(A).
  • the source access network device determines that the PLMN ID (A) is the target PLMN ID.
  • the access network equipment of operator X broadcasts the PLMN ID (XA) for the terminal equipment of operator A.
  • the access network equipment of operator X can determine that the home network of the terminal equipment is PLMN ID (A) according to the current service PLMN ID (XA) of the terminal equipment. ), at this time, the access network device of operator X determines that the target PLMN ID is PLMN ID (A) according to the current service PLMN ID (XA).
  • the access network device of operator X indicates to the AMF of operator X that the target PLMN ID is PLMN ID(A).
  • Mode 3 The source access network device determines the target PLMN ID according to the PLMN list issued by the source AMF (referred to as mode 3.1), or determines the target PLMN ID according to the mobility restriction list issued by the source AMF (represented as mode 3.2).
  • modes 3.1 and 3.2 are described respectively:
  • the source access network device determines the target PLMN ID according to the PLMN list issued by the source AMF.
  • the source AMF determines the PLMN auxiliary information of the terminal device;
  • the PLMN auxiliary information includes at least one of the following: the service PLMN ID of the terminal device, the SUPI number segment of the terminal device, and the terminal The location information of the device;
  • the source AMF determines the first PLMN ID according to the PLMN auxiliary information of the terminal device, and generates the PLMN list according to the first PLMN ID.
  • the source AMF sends the PLMN list to the source access network device.
  • the source access network device determines the target PLMN ID according to the PLMN list.
  • the source AMF determines the PLMN list of the terminal device according to information such as the HPLMN of the terminal device, the serving PLMN, the EPLMN, and the previous PLMN (Last PLMN).
  • the PLMN list includes a first PLMN ID; the first PLMN ID is the PLMN ID of the home network of the terminal device in the second PLMN network.
  • the terminal equipment of operator A determines that the PLMN ID of the current service is PLMN ID (XX) (that is, the access network equipment adopts scheme 3 to broadcast the PLMN ID) .
  • the source access network device determines that the home network information of the terminal device is the network of operator A according to the SUPI number segment of the terminal device.
  • the PLMN ID of operator A is PLMN ID(A)
  • the source AMF determines that the first PLMN ID is PLMN ID(A).
  • PLMN ID (A) is included in the PLMN list.
  • the source AMF sends the PLMN list to the source access network device.
  • the source access network device determines that the target PLMN ID is PLMN ID(A) according to the PLMN list.
  • the AMF of operator X will use the service PLMN ID of the terminal device, the number segment of the terminal device, and the location of the terminal device at least one item in the information, and deliver the PLMN list to the terminal device.
  • the AMF of operator X sends the EPLMN list including the PLMN ID (A).
  • the AMF of operator X sends the EPLMN list including the PLMN ID (YA).
  • the source AMF determines the target PLMN ID according to the mobility restriction list issued by the source AMF.
  • the source AMF determines the PLMN ID that allows the terminal device to access the network in the second PLMN network; the source AMF determines that the PLMN ID that allows the terminal device to access the network is the first PLMN ID.
  • the source AMF sends a mobility restriction list to the source access network device; the source access network device determines that the first PLMN ID indicated by the mobility restriction list is the target PLMN ID.
  • the mobility restriction list is used to indicate the first PLMN ID; the first PLMN ID is the PLMN ID of the home network of the terminal device in the second PLMN network.
  • the source AMF determines that the adjacent network of operator X at the current location is the network of operator A.
  • the PLMN ID that allows terminal equipment to access the network in operator A's network is PLMN ID(A).
  • the source AMF determines that the PLMN ID (A) is the first PLMN ID, and indicates the PLMN ID (A) to the source access network device through the mobility restriction list.
  • the source access network device determines that the PLMN ID (A) is the target PLMN ID.
  • the AMF of operator X issues a mobility restriction list to the terminal equipment of operator A, instructing the terminal equipment to preferentially select the 5G NR access technology of PLMN ID (A), and the 5G NR access technology of PLMN ID (YA) into technology.
  • the AMF can issue a mobility restriction list according to the TA.
  • the terminal device is at the border of the first area and the second area, instruct the terminal device to preferentially select the 5G NR access technology of PLMN ID (A).
  • At the border of the second area and the third area instruct the terminal device to preferentially select the 5G NR access technology of PLMN ID (YA).
  • the source access network device selects the target PLMN ID according to the current service PLMN ID of the terminal device and the EPLMN issued by the source AMF.
  • the access network equipment of operator X when the access network equipment of operator X broadcasts the same PLMN ID as PLMN ID (XX) for the terminal equipment of operator A (for example, when the above scheme 3), the terminal equipment of operator A moves from the second area to In the first area, the access network equipment of operator X can indicate to the AMF of operator X that the target PLMN ID is PLMN ID (A) according to the current service PLMN ID (XX) of the terminal equipment and the PLMN list issued by the source AMF .
  • mode 4 For the specific implementation manner of mode 4, reference may be made to the above mode 3.1, which will not be repeated here.
  • the source access network device selects the target PLMN ID according to the current serving PLMN ID of the terminal device and the mobility restriction list issued by the source AMF.
  • the access network device of operator X can indicate to the AMF of operator X that the PLMN ID of the target PLMN is PLMN ID(A) according to the current serving PLMN ID(XA) of the terminal device and the mobility restriction list issued by the serving AMF .
  • Scenario 3 Interconnection and interaction between access network equipment and core network equipment of different operators.
  • the target access network device can select the target PLMN ID according to the terminal device's access, the location information of the terminal device (for example, the TAI in the source access network device), and the terminal device's request NSSAI, select the target AMF.
  • the target AMF can discover the source AMF according to the source PLMN ID of the terminal device and the GUTI (specifically 5G-GUTI) allocated to the terminal device by the source PLMN network.
  • the signaling in the process of the target AMF discovering the source AMF can be forwarded through the secure signaling gateway.
  • Case 2.1 The operators sharing the core network support the interconnection interface N14+, and the interconnection interface can be isolated through a secure signaling gateway.
  • the target AMF can acquire the SUPI of the terminal device and the context of the terminal device from the source AMF through the N14+ interface.
  • the target AMF can create a context for the terminal device according to the acquired SUPI and the terminal device context, and notify the source AMF of the result after the creation is completed.
  • the target AMF obtains the access and mobility data of the terminal device, context information of the terminal device, SMF information, etc. from the source AMF through the cross-PLMN N14+ interface. In this way, the target AMF does not need to obtain the subscription data of the terminal device from the UDM, which not only ensures the IP address of the terminal device and service continuity, but also optimizes the process and reduces the pressure on the UDM.
  • the access network device can indicate the change of the PLMN ID of the serving PLMN for the terminal device through 5G-GUTI.
  • Network elements such as source access network equipment, source AMF, source SMF, source UPF, target access network equipment, target AMF, target SMF, and target UPF can support redirection signaling under the core network sharing architecture in the connected state process.
  • the terminal device, the access network device and the core network device need to perform corresponding action processes and implement corresponding functions in detail.
  • FIG. 4 is a schematic structural diagram of another communication system 40 provided in an embodiment of the present application.
  • the communication system provided by the embodiment of the present application includes: a terminal device 401, a source access network device 402, a source access and mobility management function AMF403, a target AMF404, and a target access network device 405;
  • the network device 402 and the source AMF403 belong to the first public land mobile network PLMN network;
  • the target AMF404 belongs to the second PLMN network;
  • the source AMF403 and the target AMF404 are connected through a communication interface;
  • the source access network device 402 is used to determine the target access network
  • the terminal device 401 is used to determine the target access network device 405 according to the frequency point information, and initiate a redirection request to the target access network device 405;
  • the request includes the first globally unique temporary identifier GUTI of the terminal device 401;
  • source AMFs and target AMFs of different operators communicate through a communication interface (for example, the communication interface may be an N14+ interface).
  • the source access network device indicates the frequency point of the target access network device to the terminal device by discovering the frequency point of the target access network device, so that the terminal device can Access to the target access network device according to the frequency point information.
  • the target AMF discovers the source AMF according to the GUTI of the terminal device, and obtains the session information of the terminal device from the source AMF.
  • the target AMF can create a session for the terminal device in the second PLMN network according to the session information of the terminal device, so that the terminal device can be redirected to the second PLMN network. In this way, the redirection of connected terminal devices among the networks of multiple operators is realized.
  • the source access network device 402 is specifically used to: determine the target PLMD ID; the target PLMN ID is the PLMN ID that needs to be selected when the terminal device 401 accesses the second PLMN network; determine the target PLMN The frequency point information of the PLMN network corresponding to the ID is the frequency point information of the target access network device 405 .
  • the target AMF404 is further configured to send a first request message to the source AMF403; the first request message is used to request the context information and the user permanent identifier SUPI of the terminal device 401; the source AMF403 is used to The first request message sends a first response message to the target AMF404; the first response message includes context information and SUPI of the terminal device 401; the target AMF404 is also used to determine the terminal device 401 according to the SUPI, and create a context for the terminal device 401 according to the context information .
  • the target AMF404 is specifically configured to: analyze the first GUTI, determine the globally unique AMF identifier GUAMI in the first GUTI; determine the AMF represented by the GUAMI as the source AMF403.
  • the source AMF 403 is further configured to send the PLMN list to the source access network device 402;
  • the PLMN list includes at least one of the following: the HPLMN of the terminal device 401, the serving PLMN, the equivalent public land mobile
  • the network EPLMN is the PLMN selected last time; the source access network device 402 is also used to determine the target PLMN from the PLMN list.
  • the source access network device 402 is specifically configured to: determine the current service PLMN ID of the terminal device 401 according to the PLMN list; determine the home network of the terminal device 401 according to the service PLMN ID of the terminal device 401 ; Determine that the PLMN ID of the home network of the terminal device 401 in the second PLMN network is the first PLMN ID; determine that the first PLMN ID is the target PLMN ID.
  • the source AMF403 is also used to send the mobility restriction list to the source access network device 402; the mobility restriction list is used to indicate the first PLMN ID; the first PLMN ID is the affiliation of the terminal device 401 The PLMN ID of the network in the second PLMN network; the source access network device 402 is configured to receive the mobility restriction list, and determine that the first PLMN ID indicated by the mobility restriction list is the target PLMN ID.
  • the source AMF403 is specifically configured to: determine the location information of the terminal device 401; determine that at the location represented by the location information of the terminal device 401, the PLMN network adjacent to the first PLMN network is the second PLMN network; Determine the PLMN ID that allows the terminal device 401 to access the network in the second PLMN network; Determine that the PLMN ID that allows the terminal device 401 to access the network is the first PLMN ID.
  • the source access network device 402 is also used to: determine the access network device adjacent to the source access network device 402 in the second PLMN network as the target access network device 405; determine the target access network device 405; Frequency point information of the access network device 405.
  • the target access network device 405 is also used to: obtain the target PLMN ID, the location information of the terminal device 401, and the slice information requested by the terminal device 401; according to the target PLMN ID, the terminal device 401's The location information, and the slice information requested by the terminal device 401 determine the target AMF 404 .
  • the source AMF403 is further configured to send the first slice indication information to the target AMF404; the first slice indication information is used to indicate the first slice information, and the first slice information is the terminal device 401 Slicing information in the home network.
  • the source AMF403 is specifically configured to: determine the first slice information when the PLMN IDs of the source AMF403 and the target AMF404 are different; generate the first slice indication according to the first slice information information.
  • the first indication information is specifically used to indicate the slice information of the terminal device 401 in the first PLMN network, and the slice information of the mapped terminal device 401 in the home network in the first network.
  • the target AMF404 is specifically used to: when the first PLMN network is the home network, determine that the slice information of the terminal device 401 in the first PLMN network is the first slice information; when the first PLMN network is not In the case of the home network, it is determined that the slice information of the mapped terminal device 401 in the first network in the home network is the first slice information.
  • the target AMF404 is further configured to: determine the first slice information; determine the second slice information mapped to the first slice information in the second PLMN network; according to the second slice information, and the terminal At least one item in the location information of the device 401 determines a target session management function SMF; the target SMF is an SMF in the second PLMN network.
  • the target AMF404 is also used to send a registration status update message to the source AMF403; the registration status update message is used to instruct the source AMF403 to release the preset session; the preset session is established for the terminal device 401 in the source AMF403 The target AMF404 does not support the session; the source AMF403 is also used to release the preset session in response to the registration status update message.
  • the system further includes: a home unified data management function UDM406; a target AMF404, which is also used to send a context request message to the home UDM406; the context request message is used to request the subscription data of the terminal device 401 to the UDM406;
  • the UDM406 is configured to send the subscription data of the terminal device 401 to the target AMF404 in response to the context request message.
  • the target AMF404 is further configured to acquire the subscription data of the terminal device 401 from the source AMF403 through the communication interface.
  • the system further includes: a target network slice selection function NSSF408; a target AMF404, which is also used to initiate a query to the target NSSF408 according to the first slice information, determine the second slice information, and support the second slice AMF list of information.
  • a target network slice selection function NSSF408 a target network slice selection function NSSF408
  • a target AMF404 which is also used to initiate a query to the target NSSF408 according to the first slice information, determine the second slice information, and support the second slice AMF list of information.
  • the target AMF 404 is further configured to query the slice mapping relationship configured in the target AMF 404 according to the first slice information, determine the second slice information, and a list of AMFs supporting the second slice information.
  • the system further includes: a first AMF; a target AMF404, which is also used to: determine whether the target AMF404 is included in the AMF list; the first AMF is an AMF in the AMF list; if not included, according to the AMF The list identifies the first AMF.
  • the target AMF 404 is further configured to send first indication information to the target access network device 405, where the first indication information includes at least one of the following: the identifier of the first AMF, the registration request message, the second slice information; the target access network device 405 is configured to generate second indication information according to the first indication information, and send the second indication information to the first AMF; the second indication information includes at least one of the following: an identifier of the first AMF, The registration request message, the second slice information; the first AMF, configured to determine at least one of the identifier of the first AMF, the registration request message, and the second slice information according to the second indication information.
  • the target AMF 404 is further configured to send third indication information to the first AMF;
  • the third indication information includes at least one of the following: a registration request message, the SUPI of the terminal device, the context of the terminal device 401, The second slice information;
  • the first AMF is configured to determine at least one of the registration request message, the SUPI of the terminal device, the context of the terminal device 401, and the second slice information according to the third indication information.
  • the system further includes: a home SMF407 and a home policy control function PCF408; the home SMF407 is further configured to send fourth indication information to the home PCF408; the fourth indication information is used to indicate SM policy management; And indicate the location information of the terminal device 401 to the home PCF 408 .
  • the target AMF 404 is further configured to send fifth indication information to the target access network device 405, where the fifth indication information is used to indicate at least one of the PLMN list and the mobility restriction list.
  • the embodiment of the present application also provides a communication method, which is used to realize the redirection of a terminal device in a connected state between networks of multiple operators.
  • the embodiment of the present application also provides a communication method, which can be applied to any communication system in FIGS. 2-4 .
  • the method includes:
  • the source access network device determines frequency point information of the target access network device.
  • the source access network device determines the target PLMD ID; the target PLMN ID is the PLMN ID that needs to be selected when the terminal device accesses the second PLMN network; the source access network device determines the PLMN ID corresponding to the target PLMN ID.
  • the frequency point information of the PLMN network is the frequency point information of the target access network device.
  • the process of the source access network device determining the frequency point information of the target access network device can be understood by referring to the process of the source access network device selecting the target PLMN ID and the frequency of the target access network device in the above scenario 2. I won't repeat them here.
  • the source access network device sends frequency point information to the terminal device.
  • the terminal device receives the frequency point information from the source access network device.
  • the terminal device determines the target access network device according to the frequency point information.
  • the terminal device searches for signals sent by each access network device, and selects an access network device whose signal frequency point information is the same as the above frequency point information as a target access network device.
  • the terminal device initiates a redirection request to the target access network device.
  • the target access network device receives the redirection request from the terminal device.
  • the redirection request includes the first GUTI of the terminal device; the first GUTI is the GUTI of the terminal device in the first PLMN network.
  • the redirection request is a mobility registration update Registration Request sent by the terminal device to the target access network device.
  • the Registration Request carries the 5G-GUTI allocated by the first PLMN network to the terminal device, the TAI of the terminal device in the first PLMN network, the list of PDU sessions that the terminal device needs to activate, and the NSSAI requested by the terminal device.
  • the target access network device forwards the redirection request to the target AMF.
  • the target AMF receives the redirection request from the target access network device.
  • the target access network device is selected according to the PLMN ID (that is, the above-mentioned target PLMN ID) that the terminal device accesses the target access network device, the TAI of the terminal device in the first PLMN network, and the TAI of the terminal device
  • the NSSAI requested by the device selects the target AMF. After selecting the target AMF, forward the above-mentioned redirection request to the target AMF.
  • the target AMF determines the source AMF according to the redirection request.
  • the target AMF parses the redirection request, and determines the first GUTI carried in the redirection request.
  • the target AMF parses the first GUTI, and determines a globally unique AMF identifier GUAMI in the first GUTI; the target AMF determines that the AMF represented by the GUAMI is the source AMF.
  • the target AMF sends a session information request message to the source AMF.
  • the source AMF receives the session information request message from the target AMF.
  • the above session request message is: Namf_Communication_UEContextTransfer Request.
  • the message carries the NAS message complete Registration Request.
  • the session request message is used to request the source AMF to obtain the SUPI (that is, IMSI) of the terminal device and the context information of the terminal device.
  • the context information of the terminal device includes: the AUSF ⁇ PCF ⁇ UDM information of the terminal device in the home network, the access and mobility context of the terminal device, the context of each PDU session of the terminal device, the Allowed NSSAI of the terminal device in HPLMN and the corresponding HPLMN.
  • the source AMF sends the session information of the terminal device to the target AMF.
  • the above session request message is: Namf_Communication_UEContextTransfer Response.
  • the message carries SUPI, UE Context, SMF information, DNN(s), source NSSAI(s) and PDU Session ID(s).
  • the target AMF After receiving the session information, the target AMF creates a context for the terminal device in the second PLMN network according to the session information.
  • the source AMF needs to indicate to the target AMF the slice information of the terminal device in the home network (denoted as the first slice information), so that the target AMF can map the terminal device in the home network according to the first slice information.
  • Slice information in the second PLMN network (denoted as second slice information).
  • the source AMF and the target AMF can indicate the first slice information and determine the second slice information in the following manner, which will be described in detail below:
  • the source AMF adds a new information element message to indicate the first slice information in the session request message.
  • the source AMF sends the Namf_Communication_CreateUEContext message to the target AMF, determine whether the PLMN IDs of the source AMF and the target AMF are the same. If not, add a first information element message (for example, allowedHomeNssai) to Namf_Communication_CreateUEContext to indicate the first slice information.
  • a first information element message for example, allowedHomeNssai
  • the target AMF parses and acquires the first cell message, and determines the first slice information according to the first cell message.
  • the first cell message is carried in UeContext object>MmContext->allowedHomeNssai.
  • Method 2 The source AMF indicates the first slice information according to the original information element of the session request message, and the target AMF determines the first slice information by analyzing different information elements from the session request message according to different mobile scenarios of the terminal device.
  • the session request message is specifically used to indicate the slice information of the terminal device in the first PLMN network, and the mapped slice information of the terminal device in the home network in the first network At least one of the .
  • the target AMF parses the session request message according to different mobile scenarios of the terminal device to determine the first slice information.
  • the target AMF determines that slice information of the terminal device in the first PLMN network is the first slice information when the first PLMN network is the home network.
  • the source AMF transfers slice information to the target AMF through UeContextTransferRspData->UeContext target>MmContex target>allowedNssai in Namf_Communication_CreateUEContext, and the target AMF regards allowedNssai as the first slice information.
  • the target AMF determines that the mapped slice information of the terminal device in the first network in the home network is the first slice information .
  • the source AMF transfers slice information to the target AMF through UeContextTransferRspData->UeContex target>MmContex target>nssaiMappingLis target>hNssai in Namf_Communication_CreateUEContext, and the target AMF regards hNssai as the first slice information.
  • source AMFs and target AMFs of different operators communicate through a communication interface (for example, the communication interface may be an N14+ interface).
  • the source access network device indicates the frequency point of the target access network device to the terminal device by discovering the frequency point of the target access network device, so that the terminal device can Access to the target access network device according to the frequency point information.
  • the target AMF discovers the source AMF according to the GUTI of the terminal device, and obtains the session information of the terminal device from the source AMF.
  • the target AMF can create a session for the terminal device in the second PLMN network according to the session information of the terminal device, so that the terminal device can be redirected to the second PLMN network. In this way, the redirection of connected terminal devices among the networks of multiple operators is realized.
  • the mobile scenarios of the terminal device in this application include the following scenarios 4-6.
  • Scenario 4 The terminal device moves from the first area to the second area;
  • Scenario 5 The terminal device moves from the second area to the first area;
  • Scenario 6 The terminal device moves from the second area to the third area.
  • Scenario 4 The terminal device moves from the first area to the second area.
  • the redirection process of the terminal device includes the following steps:
  • the source access network device sends a context release request to the source AMF.
  • the source access network device When the source access network device initiates the context release process of the terminal device to the source AMF, it will send an AN Connectiong Release message to the terminal device to indicate the redirection frequency point to the terminal, that is, the NR frequency F2 of operator X (described in the first part above)
  • the selection function of target PLMN-ID and frequency by NG-RAN and 5GC The selection function of target PLMN-ID and frequency by NG-RAN and 5GC).
  • the source access network device releases the context.
  • the source AMF of operator A sends to the source access network device: UE Context Release Command.
  • the source access network device replies to the source AMF: UE Context Release Complete.
  • the terminal device sends a mobility registration update request to the target access network device.
  • the mobility registration update request is: Registration Request.
  • the mobility registration update request carries the 5G-GUTI allocated by operator A to the terminal device, the TAI of operator A, the list of PDU sessions that need to be activated, and the requested NSSAI (the NSSAI is the NSSAI of the terminal device in the source PLMN network, which cannot for AMF selection and SMF selection in the target network).
  • the target access network device selects a target AMF.
  • the target access network device selects the target AMF according to the PLMN-ID, TAI, and requested NSSAI selected by the terminal device.
  • the target access network device forwards the mobility registration update request to the target AMF.
  • the target AMF discovers the source AMF.
  • the target AMF discovers the source AMF according to the 5G-GUTI allocated by operator A to the terminal equipment.
  • the GUAMI of the source AMF is included in the 5G-GUTI.
  • the target AMF discovers the source AMF according to the GUAMF.
  • the target AMF sends to the source AMF: Namf_Communication_UEContextTransfer Request.
  • Namf_Communication_UEContextTransfer Request carries: NAS message complete Registration Request, the target AMF obtains the SUPI (IMSI) of the terminal device and the context of the terminal device from the source AMF, the context includes the AUSF ⁇ PCF ⁇ UDM information of the terminal device in the home network, the connection Entry and mobility context, context of each PDU session, Allowed NSSAI in HPLMN and corresponding HPLMN, etc.
  • the Namf_Communication_UEContextTransfer Request carries the PLMN ID selected when the terminal device accesses the target access network device (that is, the requested PLMN: request PLMN), and the target PLMN is the PLMN ID carried in the GUAMI of the terminal device.
  • the source AMF sends a Namf_Communication_UEContextTransfer Response to the target AMF.
  • Namf_Communication_UEContextTransfer Response carries SUPI, UE Context, SMF information, DNN(s), source NSSAI(s) and PDU Session ID(s).
  • the target AMF After receiving the context of the terminal device from the source AMF, the target AMF creates a context for the terminal device.
  • the target AMF needs to map slice resources for the terminal device in the target network according to the slice resources of the terminal device in the home network.
  • a security process is performed between the terminal device and the home AUSF.
  • the target AMF sends a registration status update message to the source AMF.
  • the registration status update message is: Namf_Communication_RegistrationStatusUpdate.
  • the registration status update message carries: PDU Session ID(s).
  • the target AMF informs the source AMF through this message that the registration of the terminal device in the target AMF has been completed. For slices and sessions that the target AMF cannot support (according to network capabilities and network sharing agreements), the target AMF notifies the source AMF in this message, and the source The AMF initiates the release procedure for sessions that cannot be supported.
  • transferStatus in the message set to "Transferred", carrying the PDU Session ID list transferred to the target AMF.
  • the target AMF discovers the belonging UDM.
  • the target AMF discovers the process of belonging to the UDM through the inter-network security signaling gateway according to the SUPI.
  • the target AMF acquires context information of the terminal device.
  • the target AMF sends a context registration message to the home UDM.
  • the context registration message is: Nudm_UECM_Registration.
  • the target AMF uses this procedure to register the target AMF with the home UDM, and the home UDM sends a reply response.
  • the target AMF sends Nudm_SDM_Get to the home UDM. Through this message, the target AMF obtains the subscription data of the terminal device from the home UDM, including access and mobility data, SMF selection migration data, context data of the terminal device in the SMF, etc., and the UDM replies with a response message.
  • the target AMF obtains the terminal device's access and mobility data, terminal device context information, SMF information, etc. from the source AMF through the cross-PLMN N14+ interface, without obtaining the terminal device's subscription data from the UDM.
  • the target AMF sends to the home UDM: Nudm_UECM_Subscribe, the vAMF uses this process to subscribe to the notification of the home UDM, and the home UDM replies.
  • the home UDM sends the source AMF: Nudm_UECM_DeregistrationNotification.
  • the target AMF registers with the home UDM, and the home UDM notifies the source AMF to deregister.
  • the source AMF sets a relevant timer, and deletes the context information of the terminal device after the timer expires.
  • the source AMF sends to the home UDM: Nudm_SDM_unsubscribe, canceling the subscription of the home UDM notification message.
  • the target AMF discovers the target SMF.
  • the target AMF initiates a target SMF (shared SMF) discovery process.
  • the target AMF can discover the target SMF through the location information and slice information of the terminal device.
  • the target AMF acquires mapped slice information.
  • the target AMF determines the mapped slice information by querying the target NSSF.
  • the target AMF queries the target NSSF according to the allowedHomeNssai obtained in S606, and obtains the mapped NSSAI, including Allowed NSSAI, Configured NSSAI, mapped Allowed NSSAI, Mapped Configed NSSAI, etc., and AMF SET that supports the above mapped NSSAI.
  • the target AMF determines the mapped slice information by querying the local configuration.
  • the target AMF obtains the mapped slice and the AMF SET supporting the mapped slice according to the local configuration of the target AMF.
  • the target AMF judges that AMF reselection is required, and after reselection, the The slice information is sent to the reselected AMF.
  • the method for the target AMF to send slice information to the reselected target AMF includes the following cases C and D, which will be described in detail below.
  • the target AMF sends slice information to the reselected target AMF through the target access network device.
  • the initial target AMF forwards the NAS message to the target target AMF through the RAN.
  • the initial target AMF sends a Reroute NAS message to the target access network device, which contains slice information such as the target AMF, Registration Request message, Allowed NSSAI, Configured NSSAI, mapped Allowed NSSAI, and Mapped Configured NSSAI.
  • the target access network device sends an Initial UE message to the target target AMF, including slice information obtained from the initial target AMF.
  • the target AMF directly sends slice information to the reselected target AMF.
  • the initial target AMF directly forwards the NAS message to the target target AMF
  • the initial target AMF directly sends the Namf_Communication_N1MessageNotify message to the target target AMF, carrying the Registration Request message, the SUPI of the terminal device, the MM Context of the terminal device, and the slice mapping information etc.
  • the target AMF sends a PDU session context creation request to the target SMF.
  • the PDU session context creation request is: Nsmf_PDUSession_CreateSMContext Request.
  • the PDU session context creation request includes at least one of the following: PDU Session ID and SM Context ID obtained from S606, UE location info, Access Type, RAT Type, Operation Type, where the SM Context ID points to the source SMF, and the target AMF sets the Operation Type Set to "UP activate", which means to establish the N3 tunnel of the user plane for the PDU Session(s).
  • the target SMF determines the PDU session context.
  • the target SMF sends to the source SMF: Nsmf_PDUSession_Context Request (SM context type, SM Context ID), the target SMF uses the SM Context ID received from the target AMF in this step to obtain all SM Context from the source SMF, including PDN Connection Context and 5G SM Context.
  • Nsmf_PDUSession_Context Request SM context type, SM Context ID
  • the target SMF uses the SM Context ID received from the target AMF in this step to obtain all SM Context from the source SMF, including PDN Connection Context and 5G SM Context.
  • the source SMF determines the PDU session context information of the terminal device according to the SM Context ID, and sends a response to the target SMF.
  • the target SMF selects a target UPF.
  • the target SMF initiates an N4 session establishment process to the target UPF.
  • the target SMF sends a PDU session creation request to the source SMF.
  • the PDU session creation request is: Nsmf_PDUSession_Create Request.
  • the PDU session context creation request includes at least one of the following: target UPF DL tunnel information, SM Context ID of the target SMF, Access Type, RAT type).
  • the target SMF initiates a session establishment process to the source SMF, carrying the N9 tunnel information allocated by the target UPF.
  • the source SMF modifies the N4 session.
  • the source SMF initiates an SM policy management process to the PCF, and notifies the PCF of the location information of the terminal device.
  • the source SMF initiates an N4 session modification process to the source UPF, the source SMF provides the N9 tunnel information of the target UPF, and the source UPF allocates N9 tunnel resources.
  • the source SMF sends a PDU session creation response to the target SMF.
  • the PDU session creation response is: Nsmf_PDUSession_Create Response.
  • the PDU session creation response includes the N9 tunnel information of the source UPF received from S617.
  • the downlink data channel from the source UPF to the target UPF is established.
  • the target SMF sends a PDU session context creation response to the target AMF.
  • the PDU session creation response is: Nsmf_PDUSession_CreateSMContext Response.
  • the PDU session creation response includes at least one of the following: N2 SM information (PDU Session ID, QFI(s), QoS profile(s), CN N3 Tunnel Info, source NSSAI), N1 SM Container, Cause).
  • CN N3 Tunnel Info refers to the uplink tunnel information of the target UPF.
  • the target AMF sends an initial context request to the target access network device.
  • the initial context request is: Initial Context Request.
  • the initial context request includes at least one of the following: NAS message Registration Accept, N2 SM information received from the target SMF in S619, mobility restriction list, frequency priority, and equivalent PLMN list for assisting the terminal device in PLMN-ID selection .
  • the target access network device allocates RAN tunnels for the PDU session, and allocates QoS resources for the PDU session.
  • the uplink data channel from the terminal device to the target UPF to the source UPF is established.
  • the target AMF sends the mapped slice information to the terminal device, and sends the PLMN list or the mobility restriction list to the terminal device and the target access network device.
  • the mapped slice information includes: mapped Allowed NSSAI, Mapped Configed NSSAI.
  • the terminal device sends a registration completion message to the target AMF.
  • the registration completion message is: Registration Complete.
  • Registration Complete is a NAS message.
  • the terminal device replies a NAS message Registration Complete to the target AMF through the target access network device.
  • the target AMF sends a PDU session context update request to the target SMF.
  • the PDU session context update request is: Nsmf_PDUSession_UpdateSMContext Request.
  • the PDU session context update request includes at least one of the following: N2 SM information, RAT type, Access type, and the N2 SM information received by the target AMF from step 17.
  • the target SMF modifies the N4 session.
  • the target SMF initiates the N4 session modification process to the target UPF.
  • the target SMF sends AN Tunnel information to the target UPF, and the downlink channel from the target UPF to the target access network device to the terminal device is established.
  • the target SMF updates the PDU session context.
  • the target SMF sends to the source SMF: Nsmf_PDUSession_Update request (RAT type, Access type), and the source SMF updates the PDU Session.
  • the source SMF replies to the target SMF: Nsmf_PDUSession_Update Response.
  • the target SMF replies to the target AMF: Nsmf_PDUSession_UpdateSMContext Response.
  • the target SMF sends a PDU session context update response to the target AMF.
  • the PDU session context update response is: Nsmf_PDUSession_UpdateSMContext Response.
  • scenario 4 when the terminal device moves from the first area to the second area, the redirection process of the terminal device has been described in detail.
  • Scenario 5 The terminal device moves from the second area to the first area.
  • the redirection process of the terminal device includes the following steps:
  • the source access network device sends a context release request to the source AMF, and releases the context.
  • the source access network device sends a context release request to the source AMF.
  • the source access network device When the source access network device initiates the context release process of the terminal device to the source AMF, it will send an AN Connectiong Release message to the terminal device to indicate the redirection frequency point to the terminal, that is, the NR frequency F1 of operator A.
  • the source AMF sends to the source access network device: UE Context Release.
  • the source access network device replies to the source AMF: UE Context Release Complete.
  • the terminal device sends a mobility registration update request to the target access network device.
  • the mobility registration update request is: Registration Request.
  • the mobility registration update request carries the 5G-GUTI allocated to the terminal device by the source AMF of operator X (or operator Y), the TAI of operator X (or Y), the list of PDU sessions that need to be activated, and the requested NSSAI.
  • the target access network device forwards the mobility registration update request of the terminal device to the target AMF.
  • the target access network device selects a target AMF.
  • the target access network device forwards the mobility registration update request to the target AMF.
  • the mobility registration update request carries Registration Type: mobility registration updating, 5G-GUTI, UE security capability, NAS message container, N2 message (Location Information (tai tac), Cell Identity and Establishment cause.
  • the target AMF discovers the source AMF.
  • the target AMF discovers the source AMF according to the 5G-GUTI allocated to the terminal device by the source AMF of operator X (or Y).
  • the GUAMI of the source AMF is included in the 5G-GUTI.
  • the target AMF discovers the source AMF according to the GUAMF.
  • the target AMF acquires context information of the terminal device.
  • the target AMF sends a context request message to the source AMF.
  • the context request message is: Namf_Communication_UEContextTransfer Request.
  • the NAS message complete Registration Request is carried in the context request message.
  • the target AMF obtains the SUPI (that is, the IMSI) of the terminal device and the context of the terminal device from the source AMF.
  • the UE Context includes the Allowed NSSAI in the HPLMN and the corresponding HPLMN.
  • the source AMF sends a context response message to the target AMF.
  • the context response message is: Namf_Communication_UEContextTransfer Response.
  • the context response message carries SUPI, UE Context, SMF information, DNN(s), source NSSAI(s) and PDU Session ID(s).
  • the target AMF After receiving the context of the terminal device from the source AMF, the target AMF creates a context for the terminal device.
  • S707 A security process is performed between the terminal device and the home AUSF.
  • the target AMF sends a registration status update message to the source AMF.
  • the registration status update message is: Namf_Communication_RegistrationStatusUpdate.
  • the registration status update message carries: PDU Session ID(s).
  • the target AMF informs the source AMF through this message that the registration of the terminal device in the target AMF has been completed. For slices and sessions that the target AMF cannot support (according to network capabilities and network source protocols), the target AMF notifies the source AMF in this message that the source The AMF initiates the release procedure for sessions that cannot be supported.
  • the transferStatus in the message “Transferred", carrying the PDU Session ID list transferred to the target AMF.
  • the target AMF judges that the terminal equipment has returned to the home network, and instructs to delete the source SMF and UPF in the message.
  • the target AMF discovers the belonging UDM.
  • the target AMF discovers the process of belonging to the UDM through the inter-network security signaling gateway according to the SUPI.
  • the target AMF acquires context information of the terminal device.
  • the target AMF sends a context registration message to the home UDM.
  • the context registration message is: Nudm_UECM_Registration.
  • the target AMF uses this procedure to register the target AMF with the home UDM, and the home UDM sends a reply response.
  • the target AMF obtains the subscription data through Nudm_SDM_Get (optional step).
  • v-AMF obtains the subscription data of the terminal device from hUDM, including access and mobility data, SMF selection migration data, context data of the terminal device in SMF, etc., and UDM replies with a response message.
  • the target AMF obtains the access and mobility data of the terminal device, the context information of the terminal device, SMF information, etc. from the source AMF through the N14 interface across the PLMN, and does not need to obtain the subscription data of the terminal device from the UDM.
  • the target AMF subscribes to the subscription data change notification service through Nudm_SDM_Subscribe.
  • the home UDM sends Nudm_UECM_DeregistrationNotify to the source AMF.
  • the target AMF is registered with the home UDM, and the home UDM notifies the logout of the source AMF.
  • the source AMF sets a relevant timer, and deletes the context information of the terminal device after the timer expires.
  • the target AMF sends a PDU session creation request to the target SMF.
  • the session creation request is: Nsmf_PDUSession_CreateSMContext.
  • Session creation request includes: SUPI, DNN, source NSSAI(s), Request Type, PDU Session ID, AMF ID, SM Context ID, User location information.
  • the belonging SMF requests the session context.
  • the home SMF sends a session context request to the source SMF.
  • the session context request is: Nsmf_PDUSession_Context Request.
  • the session context request includes: SM context type, SM Context ID received in this step), to obtain SM Context from the source SMF.
  • the source SMF sends a session context reply response message to the target SMF.
  • the session context reply response message is: Nsmf_PDUSession_Context Response.
  • the session context reply response message is used to return SM Context (PDU Session ID, DNN, sNssai, session AMBR, QoS Flow list, belonging UPF PSA tunnel info).
  • the target SMF sends an N4 session modification request to the home UPF.
  • the N4 session modification request is: N4 Session Modification Request.
  • N4 session modification request includes: forwarding parameters.
  • the attributable UPF replies to the attributable SMF: N4 session modification response, creating CN Tunnel Info, TEID and IP of UP.
  • the target SMF sends a PDU session creation response to the target AMF.
  • the session creation response is: Nsmf_PDUSession_CreateSMContext Response.
  • the session creation response includes: PDU Session ID, N2 SM Information.
  • the N2 SM Information includes the N3UP address and the uplink CN Tunnel ID and QoS parameters of the UPF, and the PDU Session user plane connection belonging to the SMF is activated.
  • the downlink user plane belonging to the UPF to the target access network device is established.
  • the target AMF sends a registration acceptance message to the terminal device.
  • the registration acceptance message is: Registration Accept.
  • the registration accept message is used to notify the terminal device that the registration request is received.
  • the registration acceptance message includes the allocated 5G-GUTI, carrying the mobility restriction list, frequency priority, equivalent PLMN list, etc. for assisting terminal equipment in PLMN-ID selection, TAI list, Allowed NSSAI, Configured NSSAI, PDU Session status, etc.
  • the EPLMN list sets PLMN-ID-A, PLMN-ID-XA and PLMN-ID-YA as equivalent PLMNs.
  • the uplink user plane from the terminal device to the target access network device to the home UPF is established.
  • the terminal device sends a registration completion message to the target AMF.
  • the registration completion message is: Registration Complete.
  • the source AMF initiates a PDU session release process to the source SMF.
  • the source AMF sends an Nsmf_PDUSession_ReleaseSMContext Request to the source SMF, indicating that only the session resources of the source SMF are released.
  • the target AMF sends a PDU session context update request message to the target SMF.
  • the PDU session context update request message is: Nsmf_PDUSession_UpdateSMContext Request.
  • the session update request message includes: PDU Session ID, N2 SM information, N2 SM information type, UE Location.
  • the target SMF initiates an SM policy management process to the PCF.
  • the SM policy management process is used to notify the PCF of the location information of the terminal equipment.
  • the home SMF initiates an N4 Session modification request to the home UPF, and updates the home network side RAN SM N3 forwarding Information list to the home UPF.
  • the home UPF replies N4 Session Modification Response to the home SMF.
  • the target SMF sends a PDU session context update response message to the target AMF.
  • the PDU session context update response message is: Nsmf_PDUSession_UpdateSMContext Response.
  • the PDU session context update response includes: upCnxState: ACTIVATED, which activates the user plane resources of the PDU Session.
  • the source SMF releases the resources of the source UPF.
  • scenario 5 when the terminal device moves from the second area to the first area, the redirection process of the terminal device has been described in detail.
  • the movement of the terminal device from the second area to the first area in the above scenario 5 is only an exemplary description.
  • the above process is applicable to various scenarios where the terminal device moves from the home network to the shared network (for example, the terminal device moves from the third area to the first area), and the implementation process is similar in other scenarios. This application does not limit this.
  • Scenario 6 The terminal device moves from the second area to the third area.
  • the redirection process of the terminal device includes the following steps:
  • the source access network device sends a context release request to the source AMF.
  • the source access network device When the source access network device initiates the context release process of the terminal device to the source AMF, it will send an AN Connectiong Release message to the terminal device to indicate the redirection frequency point to the terminal, that is, the NR frequency F3 of operator Y.
  • the source access network device releases the context.
  • the source AMF sends to the source access network device: UE Context Release Command.
  • the source access network device replies to the source AMF: UE Context Release Complete.
  • the terminal device sends a mobility registration update request to the target access network device.
  • the mobility registration update request is: Registration Request.
  • the mobility registration update request carries the 5G-GUTI allocated by operator X to the terminal device, the TAI of the terminal device in operator X, the list of PDU sessions that need to be activated, and the requested NSSAI.
  • the target access network device selects a target AMF.
  • the target access network device selects the target AMF according to the PLMN-ID, TAI, and requested NSSAI selected by the terminal device.
  • the target access network device forwards the mobility registration update request to the target AMF.
  • the target AMF discovers the source AMF.
  • the target AMF discovers the source AMF according to the 5G-GUTI allocated by operator A to the terminal equipment.
  • the GUAMI of the source AMF is included in the 5G-GUTI.
  • the target AMF discovers the source AMF according to the GUAMF.
  • the target AMF sends to the source AMF: Namf_Communication_UEContextTransfer Request.
  • Namf_Communication_UEContextTransfer Request carries: NAS message complete Registration Request.
  • the target AMF obtains the SUPI (IMSI) of the terminal device and the context of the terminal device from the source AMF.
  • the UE Context includes the AUSF ⁇ PCF ⁇ UDM information of the terminal device in the home network, the access and mobility context of the terminal device, and each PDU session In the context of HPLMN's Allowed NSSAI and the corresponding HPLMN.
  • the source AMF replies to the target AMF: Namf_Communication_UEContextTransfer Response.
  • the message carries SUPI, UE Context, SMF information, DNN(s), source NSSAI(s) and PDU Session ID(s).
  • the target AMF After receiving the context of the terminal device from the source AMF, the target AMF creates a context for the terminal device.
  • S807 A security process is performed between the terminal device and the home AUSF.
  • the target AMF sends a registration status update message to the source AMF.
  • the registration status update message is: Namf_Communication_RegistrationStatusUpdate
  • the registration status update message carries: PDU Session ID(s).
  • the target AMF notifies the source AMF through this message that the registration of the terminal device in the target AMF has been completed, carrying the PDU Session ID list transferred to the target AMF.
  • the target AMF notifies the source AMF in this message, and the source AMF starts the process of releasing the sessions that cannot be supported.
  • the target AMF discovers the belonging UDM.
  • the target AMF discovers the process of belonging to the UDM through the inter-network security signaling gateway according to the SUPI.
  • the target AMF acquires context information of the terminal device.
  • the context registration message is: Nudm_UECM_Registration.
  • the target AMF uses this procedure to register the target AMF with the home UDM, and the home UDM sends a reply response.
  • the target AMF sends Nudm_SDM_Get to the home UDM. Through this message, the target AMF obtains the subscription data of the terminal device from the home UDM, including access and mobility data, SMF selection migration data, context data of the terminal device in the SMF, etc., and the UDM replies with a response message.
  • the target AMF obtains the terminal device's access and mobility data, terminal device context information, SMF information, etc. from the source AMF through the cross-PLMN N14+ interface, without obtaining the terminal device's subscription data from the UDM.
  • the target AMF sends to the home UDM: Nudm_UECM_Subscribe, the vAMF uses this procedure to subscribe to the notification of the home UDM, and the home UDM replies.
  • the home UDM sends the source AMF: Nudm_UECM_DeregistrationNotification.
  • the target AMF registers with the home UDM, and the home UDM notifies the source AMF to deregister.
  • the source AMF sets a relevant timer, and deletes the context information of the terminal device after the timer expires.
  • the source AMF sends to the home UDM: Nudm_SDM_unsubscribe, canceling the subscription of the home UDM notification message.
  • the target AMF discovers the target SMF.
  • the target AMF initiates a target SMF (shared SMF) discovery process.
  • the target AMF can discover the target SMF through the location information and slice information of the terminal device.
  • the target AMF sends a PDU session context creation request to the target SMF.
  • the PDU session context creation request is: Nsmf_PDUSession_CreateSMContext Request.
  • the PDU session context creation request includes at least one of the following: PDU Session ID and SM Context ID obtained from S806, UE location info, Access Type, RAT Type, Operation Type.
  • the SM Context ID points to the belonging SMF, and the target AMF sets the Operation Type to "UP activate", indicating that the N3 tunnel of the user plane is established for the PDU Session(s).
  • the target AMF determines the PDU session context.
  • the target SMF sends to the source SMF: Nsmf_PDUSession_Context Request (SM context type, SM Context ID), and the target SMF uses the SM Context ID received from the target AMF in this step to obtain all SM contexts from the source SMF, including PDN Connection Context and 5G SM context, etc.
  • Nsmf_PDUSession_Context Request SM context type, SM Context ID
  • the target SMF uses the SM Context ID received from the target AMF in this step to obtain all SM contexts from the source SMF, including PDN Connection Context and 5G SM context, etc.
  • the home SMF determines the PDU session context information of the terminal device according to the SM Context ID, and sends a response to the shared SMF.
  • the target SMF selects a target UPF.
  • the target SMF initiates an N4 session establishment process to the target UPF.
  • the target SMF creates a PDU session.
  • the target SMF sends a PDU session creation request to the source SMF.
  • the PDU session creation request is: Nsmf_PDUSession_Create Request.
  • the PDU session context creation request includes at least one of the following: the SM Context ID obtained from the target AMF and the tunnel endpoints (tunnel endpoints f) of the downlink cache data that needs to be cached.
  • the source SMF sends to the source UPF: N4 session modification, and sends the tunnel information of the downlink buffer data allocated by the target SMF to the source UPF.
  • a forwarding channel of downlink buffered data from the source UPF to the target UPF is established.
  • the source SMF replies to the target SMF: Nsmf_PDUSession_Update Response.
  • the target SMF updates the PDU session.
  • the target SMF sends to the home SMF: Nsmf_PDUSession_Update Request (SM Context ID, downlink tunnel information of the target UPF, SM Context ID of the target SMF, Access Type, RAT type), the session establishment process initiated by the shared SMF to the home SMF , carrying the N9 tunnel information allocated by the shared UPF.
  • the SM Context ID is obtained from the source SMF in step 13.
  • the home SMF initiates an SM policy management process to the PCF, and notifies the PCF of the location information of the terminal device.
  • the home SMF initiates the N4 session modification to the home UPF, carrying the downlink tunnel information of the target UPF, and the home UPF allocates the CN N9 tunnel information.
  • the belonging SMF sends to the target SMF: Nsmf_PDUSession_Update Response.
  • the downlink data channel from the home UPF to the target UPF is established, the home UPF stops sending the downlink cached data to the source UPF, and the END-MARKER that is produced and sent to the source UPF is sent to the target UPF.
  • the target UPF starts the timer after receiving the END-MARKER, and releases the indirect forwarding channel after the timer expires.
  • the target SMF sends a PDU session context creation response to the target AMF.
  • the PDU session context creation response is: Nsmf_PDUSession_CreateSMContext Response.
  • the PDU session context creation response includes at least one of the following: N2 SM information (PDU Session ID, QFI(s), QoS profile(s) CN N3 Tunnel Info, source NSSAI), N1 SM Container, Cause).
  • N2 SM information PDU Session ID, QFI(s), QoS profile(s)
  • CN N3 Tunnel Info refers to the uplink tunnel information of the target UPF.
  • the target SMF sets a timer, and releases the indirect forwarding channel for downlink buffered data after the timer expires.
  • the target AMF sends an initial context request to the target access network device.
  • the initial context request is: Initial Context Request.
  • the initial context request includes at least one of the following items: carry NAS message Registration Accept, carry N2 SM information received from the target SMF in S818, carry the mobility restriction list, frequency priority, equivalent PLMN list, etc.
  • the wireless network allocates RAN tunnels for PDU sessions, and allocates QoS resources for PDU sessions.
  • the uplink data channel from the terminal device to the target UPF to the home UPF is established.
  • the terminal device sends a registration completion message to the target AMF.
  • the registration completion message is: Registration Complete.
  • the source AMF releases the PDU session context.
  • the source AMF sends a PDU session context release request to the source SMF.
  • the PDU session context release request is: Nsmf_PDUSession_ReleaseSMContext Request.
  • the PDU session context release request is used to indicate that only the source SMF's PDU session context is released but the home SMF's PDU session context cannot be released.
  • the terminal device context is deleted and session resources are released.
  • the source SMF sets a timer, and releases the indirect forwarding channel resources of the source UPF after the timer expires.
  • the source SMF sends a PDU session context release response to the source AMF.
  • the PDU session context release response is: Nsmf_PDUSession_ReleaseSMContext response.
  • the target AMF sends a PDU session context update request to the target SMF.
  • the PDU session context update request is: Nsmf_PDUSession_UpdateSMContext Request.
  • the PDU session context update request includes: N2 SM information, RAT type, Access type, carrying the N2 SM information received by the target AMF from S820.
  • the target SMF modifies the N4 session.
  • the target SMF initiates the N4 session modification process to the target UPF.
  • the target SMF sends AN Tunnel information to the target UPF, and the downlink channel from the target UPF to the target access network device to the terminal device is established.
  • the target SMF updates the PDU session context.
  • the target SMF sends to the home SMF: Nsmf_PDUSession_Update request (RAT type, Access type), the home SMF updates the PDU Session.
  • the shared SMF sends a PDU session context update response to the target AMF.
  • the PDU session context update response is: Nsmf_PDUSession_UpdateSMContext Response.
  • the target SMF and the source SMF release the indirect forwarding channel.
  • S826a After the timer in S817 arrives, the target SMF initiates an N4 session modification process to the target UPF to release the indirect forwarding channel.
  • scenario 6 when the terminal device moves from the second area to the third area, the redirection process of the terminal device has been described in detail.
  • the movement of the terminal device from the second area to the third area in the above scenario 6 is only an exemplary description.
  • the above process is applicable to various scenarios where the terminal device moves from one shared network to another shared network (for example, the terminal device moves from the third area to the second area), and the implementation process is similar in other scenarios. This application does not limit this.
  • the functional modules of the communication device may be divided according to the above method example.
  • each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module.
  • the above-mentioned integrated modules can be implemented in the form of hardware or in the form of software function modules.
  • the division of modules in this embodiment of the present application is schematic, and is only a logical function division, and there may be another division manner in actual implementation.
  • FIG. 9 it is a schematic structural diagram of a communication device provided by an embodiment of the present application, and the device includes: a communication unit 901 and a processing unit 902 .
  • the communication unit 901 and the processing unit 902, the communication unit 901, is used for redirecting the request from the target access network device; the redirecting request includes the first globally unique temporary identifier GUTI of the terminal device; the first GUTI is the terminal device in the first GUTI in the PLMN network; the processing unit 902 is used to determine the first GUTI of the terminal device according to the redirection request, and determine the source AMF according to the first GUTI; the communication unit 901 is also used to send a session information request message to the source AMF; communication Unit 901 is further configured to receive session information from the terminal device of the source AMF.
  • the processing unit 902 is specifically configured to: instruct the communication unit 901 to send a first request message to the source AMF; the first request message is used to request the context information and the user permanent identifier SUPI of the terminal device; A first response message from the source AMF; the first response message includes context information and SUPI of the terminal device; the terminal device is determined according to the SUPI, and a context is created for the terminal device according to the context information.
  • the processing unit 902 is specifically configured to: parse the first GUTI, determine the globally unique AMF identifier GUAMI in the first GUTI; determine the AMF represented by the GUAMI as the source AMF.
  • the communication unit 901 is also configured to send a registration status update message to the source AMF; the registration status update message is used to instruct the source AMF to release the preset session; the preset session is not supported by the target AMF established by the source AMF for the terminal device session.
  • the communication unit 901 is also used to send a context request message to the UDM; the context request message is used to request the subscription data of the terminal device from the UDM; and the target AMF receives the subscription data of the terminal device from the UDM.
  • processing unit 902 is further configured to instruct the communication unit 901 to acquire the subscription data of the terminal device from the source AMF through the communication interface.
  • the processing unit 902 is further configured to initiate a query to the target network slice selection function NSSF according to the first slice information, determine the second slice information, and the AMF list supporting the second slice information, the first slice information is the terminal The slice information of the device in the home network.
  • the processing unit 902 is further configured to determine whether the target AMF is included in the AMF list; the first AMF is an AMF in the AMF list; if not included, determine the first AMF according to the AMF list.
  • the communication unit 901 is further configured to send the first indication information to the target access network device, so that the target access network device forwards the identifier of the first AMF and the registration request message to the first AMF according to the first indication information, At least one item in the second slice information.
  • the communication unit 901 is further configured to send third indication information to the first AMF;
  • the third indication information includes at least one of the following: a registration request message, SUPI of the terminal device, context of the terminal device, and second slice information.
  • the communication unit 901 is further configured to send fifth indication information to the target access network device, where the fifth indication information is used to indicate at least one of the PLMN list and the mobility restriction list.
  • FIG. 10 it is a schematic structural diagram of another communication device provided by the embodiment of the present application, and the device includes: a communication unit 1001 and a processing unit 1002 .
  • the processing unit 1002 is configured to determine the frequency point information of the target access network device, and the communication unit 1001 is configured to send the frequency point information to the terminal device; the frequency point information of the target access network device is used to instruct the terminal device to receive the frequency point information according to the frequency point information enter the target access network device, and send a redirection request to the terminal device through the target access network device.
  • the processing unit 1002 is also used to: determine the target PLMD ID; the target PLMN ID is the PLMN ID that needs to be selected when the terminal device accesses the second PLMN network; determine the frequency point information of the PLMN network corresponding to the target PLMN ID is the frequency point information of the target access network device.
  • the optional communication unit 1001 is also used to receive the PLMN list from the source AMF; the PLMN list includes at least one of the following items: HPLMN of the terminal device, serving PLMN, equivalent public land mobile network EPLMN, previously selected PLMN; processing Unit 1002 is further configured to determine the target PLMN from the PLMN list.
  • the processing unit 1002 is also configured to: determine the current service PLMN ID of the terminal device according to the PLMN list; the source access network device determines the home network of the terminal device according to the service PLMN ID of the terminal device; determine the home network of the terminal device
  • the PLMN ID of the network in the second PLMN network is the first PLMN ID; the first PLMN ID is determined to be the target PLMN ID.
  • the communication unit 1001 is also configured to receive a mobility restriction list from the source AMF; the mobility restriction list is used to indicate the first PLMN ID; the first PLMN ID is the home network of the terminal device in the second PLMN network PLMN ID; the processing unit 1002 is further configured to determine that the first PLMN ID indicated by the mobility restriction list is the target PLMN ID.
  • the processing unit 1002 is further configured to: determine that an access network device adjacent to the source access network device in the second PLMN network is the target access network device; and determine frequency point information of the target access network device.
  • FIG. 11 it is a schematic structural diagram of another communication device provided by the embodiment of the present application, and the device includes: a communication unit 1101 and a processing unit 1102 .
  • the processing unit 1102 is configured to instruct the communication unit 1101 to receive the session information request message from the target AMF; wherein, the source AMF is the AMF determined by the target AMF according to the first GUTI of the terminal device; the processing unit 1102 is also configured to instruct the communication unit 1101 to respond In the session request message, send the session information of the terminal device to the target AMF.
  • the apparatus further includes: a processing unit 1102, further configured to instruct the communication unit 1101 to send the PLMN list to the source access network device;
  • the PLMN list includes at least one of the following: the HPLMN of the terminal device, the serving PLMN, the equivalent public The land mobile network EPLMN, the PLMN selected last time.
  • the processing unit 1102 is further configured to instruct the communication unit 1101 to send a mobility restriction list to the source access network device; the mobility restriction list is used to indicate the first PLMN ID; the first PLMN ID is the home network of the terminal device in PLMN ID in the second PLMN network.
  • the processing unit 1102 is further configured to: determine the location information of the terminal device; determine that at the position represented by the location information of the terminal device, the PLMN network adjacent to the first PLMN network is the second PLMN network; determine the second PLMN network; The PLMN ID that allows the terminal device to access the network in the PLMN network; determine that the PLMN ID that allows the terminal device to access the network is the first PLMN ID.
  • the apparatus further includes: a processing unit 1102, further configured to instruct the communication unit 1101 to send first slice indication information to the target AMF; the first slice indication information is used to indicate the first slice information, and the first slice The information is slice information of the terminal equipment in the home network.
  • the processing unit 1102 is further configured to: determine first slice information when the PLMN IDs of the source AMF and the target AMF are different; generate a first slice indication message according to the first slice information.
  • the first indication information is specifically used to indicate at least one of slice information of the terminal device in the first PLMN network and slice information of the mapped terminal device in the first network in the home network.
  • the processing unit 1102 is further configured to: instruct the communication unit 1101 to receive a registration status update message from the target AMF; the registration status update message is used to instruct the source AMF to release the preset session; the preset session is a terminal device in the source AMF The established session is not supported by the target AMF; the preset session is released in response to the Registration Status Update message.
  • the processing unit may be a processor or a controller. It can implement or execute the various illustrative logical blocks, modules and circuits described in connection with the present disclosure.
  • the processor can also be a combination of computing functions, for example, a combination of one or more microprocessors, a combination of DSP and a microprocessor, and so on.
  • the communication unit may be a transceiver circuit or a communication interface or the like.
  • the storage module may be a memory.
  • the embodiment of the present application also provides a computer-readable storage medium, where an instruction is stored in the computer-readable storage medium, and when the computer executes the instruction, the computer executes each step in the method flow shown in the above-mentioned method embodiment.
  • Embodiments of the present application provide a computer program product containing instructions, and when the instructions are run on a computer, the computer is made to execute the communication method in the above method embodiments.
  • An embodiment of the present application provides a chip, the chip includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is used to run computer programs or instructions to implement the communication method in the above method embodiments.
  • the computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or device, or any combination thereof. More specific examples (non-exhaustive list) of computer readable storage media include: electrical connection having one or more wires, portable computer disk, hard disk.
  • Random access memory Random Access Memory, RAM
  • read-only memory Read-Only Memory, ROM
  • erasable programmable read-only memory Erasable Programmable Read Only Memory, EPROM
  • registers hard disk, optical fiber, portable compact Disk read-only memory (Compact Disc Read-Only Memory, CD-ROM), an optical storage device, a magnetic storage device, or any other form of computer-readable storage medium in a suitable combination of the above, or values in the art.
  • An exemplary storage medium is coupled to the processor such that the processor can read information from, and write information to, the storage medium.
  • the storage medium may also be a component of the processor.
  • the processor and the storage medium may be located in an Application Specific Integrated Circuit (ASIC).
  • a computer-readable storage medium may be any tangible medium containing or storing a program, and the program may be used by or in combination with an instruction execution system, apparatus or device.

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Abstract

La présente demande concerne un système, un procédé et un appareil de communication et un support de stockage, se rapportant au domaine technique des communications. La redirection de dispositifs terminaux connectés parmi des réseaux d'une pluralité d'opérateurs est réalisée dans un processus de partage d'un réseau central par la pluralité d'opérateurs. Le procédé comprend les étapes suivantes : une AMF cible reçoit une demande de redirection en provenance d'un dispositif de réseau d'accès cible, la demande de redirection comprenant un premier identifiant temporaire globalement unique (GUTI) d'un dispositif terminal, et le premier GUTI étant un GUTI du dispositif terminal dans un premier PLMN ; l'AMF cible détermine le premier GUTI du dispositif terminal selon la demande de redirection, et détermine une AMF source selon le premier GUTI ; l'AMF cible envoie un message de demande d'informations de session à l'AMF source ; et l'AMF cible reçoit des informations de session du dispositif terminal en provenance de l'AMF source. Les modes de réalisation de la présente demande sont utilisés dans un processus de redirection de partage d'un réseau central par une pluralité d'opérateurs.
PCT/CN2022/134823 2022-01-05 2022-11-28 Système, procédé et appareil de communication et support de stockage WO2023130858A1 (fr)

Applications Claiming Priority (2)

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