WO2023130856A1 - Procédé et appareil de communication, et dispositif de réseau central, dispositif terminal et support de stockage - Google Patents

Procédé et appareil de communication, et dispositif de réseau central, dispositif terminal et support de stockage Download PDF

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Publication number
WO2023130856A1
WO2023130856A1 PCT/CN2022/134821 CN2022134821W WO2023130856A1 WO 2023130856 A1 WO2023130856 A1 WO 2023130856A1 CN 2022134821 W CN2022134821 W CN 2022134821W WO 2023130856 A1 WO2023130856 A1 WO 2023130856A1
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WIPO (PCT)
Prior art keywords
core network
terminal device
network device
registration
request message
Prior art date
Application number
PCT/CN2022/134821
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English (en)
Chinese (zh)
Inventor
马泽芳
王光全
苗守野
冯立华
赫罡
任驰
马瑞涛
贺琳
师瑜
Original Assignee
中国联合网络通信集团有限公司
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Publication of WO2023130856A1 publication Critical patent/WO2023130856A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/34—Reselection control
    • H04W36/38—Reselection control by fixed network equipment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H04W8/08—Mobility data transfer
    • H04W8/14—Mobility data transfer between corresponding nodes

Definitions

  • the present invention relates to the communication field, in particular to a communication method, device, core network equipment, terminal equipment and storage medium.
  • the home routing method is used to process the data of the roaming terminal device.
  • the data generated by the roaming terminal device after accessing the roaming network is transmitted from the roaming network to the home network, and the home network is responsible for processing the data of the roaming terminal device.
  • the signaling plane between the roaming network and the home network is connected through security edge protection proxies (SEEP), and the user plane is connected through the user plane function (UPF) of the roaming network and the home network through an edge router.
  • SEEP security edge protection proxies
  • UPF user plane function
  • the current standard has not yet defined the interoperability interface (N26 interface) between the roaming network and the home network, resulting in terminal equipment being in the fourth generation mobile communication technology (4th Generation mobile communication technology, 4G) network of the home network and the 5G network of the roaming network.
  • 4G fourth generation mobile communication technology
  • 5G 5G network of the roaming network.
  • PDU Protocol Data Unit
  • the present application provides a communication method, device, core network equipment, terminal equipment and storage medium, which can ensure service continuity when the terminal equipment moves between a home network and a roaming network.
  • a communication method including: a core network device receives a first registration request message from a terminal device; in response to the first registration request message, the core network device sends a first registration response message to the terminal device; the first registration The response message is used to indicate that the core network device supports the first interoperation; the first interoperation is used to ensure service continuity when the terminal device moves between PLMN networks that are not configured with an interoperation interface.
  • the first registration response message includes the first target value
  • the first preset field the first preset field whose value is the first target value is used to indicate that the core network device supports the first interoperation.
  • the first registration response message includes the value of the second target value
  • the second preset field the second preset field whose value is the second target value is used to indicate that the core network device supports the first interoperation.
  • the first registration response message is also used to indicate that the core network device supports the second interoperation; the second interoperation is used to ensure that the terminal device is configured with an interoperable interface Business continuity during handover within the same PLMN network.
  • the first registration response message further includes a third preset field whose value is the third target value; the third preset field whose value is the third target value It is used to indicate that the core network device supports the second interoperation.
  • the core network device is an AMF of a roaming operator
  • the method further includes: the core network device determines that the terminal device The identifier of the PLMN network to which the terminal device belongs; when the identifier of the PLMN network to which the terminal device belongs is the first preset PLMN network identifier, the core network device sends a first registration response message to the terminal device.
  • the first registration response message is used to indicate that the core network The device supports the second interoperability.
  • the first registration response message includes a second preset field whose value is the fourth target value; the second preset field whose value is the fourth target value is used for It is used to instruct the core network equipment to support the second interoperation.
  • the first registration response message includes a third preset field whose value is a third target value; the third preset field whose value is a third target value is used for It is used to instruct the core network equipment to support the second interoperation.
  • the first registration request message is used to indicate that the terminal device supports the first interoperation.
  • the first registration request message includes a fourth preset field whose value is the fifth target value; the fourth preset field whose value is the fifth target value is used for To instruct the terminal device to support the first interoperation.
  • the first registration request message is further used to indicate that the terminal device supports the second interoperation.
  • the first registration request message further includes a fifth preset field whose value is the sixth target value; the fifth preset field whose value is the sixth target value It is used to indicate that the terminal device supports the second interoperation.
  • the core network device is the MME in the home network, or the core network device is the AMF in the roaming network.
  • the first registration request message further includes a sixth preset field whose value is the seventh target value, The sixth preset field whose value is the seventh target value is used to indicate that the terminal device supports the N1 interface of the 5G network; if the core network device is an AMF roaming in the 5G network, the first registration request message also includes the value The seventh preset field with eight target values, the seventh preset field with the eighth target value is used to indicate that the terminal device supports the S1 interface of the 4G network.
  • the first registration request message is an Attach Request message sent by the terminal device to the core network device, and the first registration response The message is the Attach Accept message sent by the core network device to the terminal device; if the core network device is an AMF roaming in the 5G network, the first registration request message is the Registration Request message sent by the terminal device to the core network device, and the first registration response message It is the Registration Accept message sent by the core network device to the terminal device.
  • the core network device supports the first interoperability through the following steps: the core network device receives information from the terminal device The attachment request message; wherein, the attachment request message is an attachment request message generated after the terminal device moves from the roaming 5G network to the home 4G network; the attachment request message includes a PDN connection request message, and the request type of the PDN connection request message is handover; roaming No interoperability interface is configured between the 5G network and the home 4G network; in response to the attach request message, the core network device sends a location update request message to the HSS+UDM; the location update request message is to instruct the HSS+UDM not to initiate the deregistration process to the old AMF The location update request message of the old AMF is the AMF in the second PLMN network; the core network equipment receives the location update response message from HSS+UDM; the location update response message includes the PGWC
  • the method further includes: the core network device sends an initial context establishment request and attaches to the access network device Response message: The core network device receives the initial context establishment response message from the access network device and the attach completion message from the terminal device.
  • the attach response message is used to indicate that the core network device supports the first interoperation.
  • the method further includes: the core network device receives the TAU request message from the terminal device; the TAU message includes the first A GUTI; the first GUTI is the GUTI obtained from the GUTI mapping of the terminal device in the roaming 5G network; the core network device determines that the context of the terminal device cannot be obtained according to the first GUTI; the core network device sends a TAU rejection message to the terminal device.
  • the core network device when the core network device is an AMF in a roaming 5G network, supports the first interoperability through the following steps: the core network device receives a message from the terminal device The second registration request message; the second registration request is a registration request generated after the terminal device moves from the home 4G network to the roaming 5G network; the registration type of the second registration request message is mobility registration update; the roaming 5G network and the home 4G network There is no interoperability interface configured between them; in response to the registration request message, the core network device sends a UDM registration request to HSS+UDM, and the UDM registration request is used to instruct HSS+UDM not to perform location deletion operation; the core network device receives the UDM registration request from HSS+UDM The subscription data of the terminal device; the subscription data includes at least one of the following: DNN or APN, and the SMF+PGW-C FQDN connected to the third PDU; the SMF+PGW-C FQDN
  • the method further includes: the core network device sends a third registration acceptance message to the terminal device; 3.
  • the registration acceptance message is used to indicate that the core network device supports the first interoperability.
  • a communication method including: a terminal device sends a first registration request message to a core network device; the terminal device receives a first registration response message from the core network device; the first registration response message is used to instruct the core network device
  • the first interoperability is supported; the first interoperability is used to ensure service continuity when the terminal device moves between PLMN networks that are not configured with an interoperability interface.
  • the first registration response message when the core network device and the terminal device belong to the same operator, the first registration response message includes the first target value The first preset field; the first preset field whose value is the first target value is used to indicate that the core network device supports the first interoperation.
  • the first registration response message includes the second target value
  • the second preset field the second preset field whose value is the second target value is used to indicate that the core network device supports the first interoperation.
  • the first registration response message is also used to indicate that the core network device supports the second interoperation; the second interoperation is used to ensure that the terminal device is configured with an interoperable interface Business continuity during handover within the same PLMN network.
  • the first registration response message further includes a third preset field whose value is the third target value; the third preset field whose value is the third target value It is used to indicate that the core network device supports the second interoperation.
  • the core network device is an AMF of a roaming operator
  • the method further includes: the core network device determines that the terminal device The identifier of the PLMN network to which the terminal device belongs; when the identifier of the PLMN network to which the terminal device belongs is the first preset PLMN network identifier, the core network device sends a first registration response message to the terminal device.
  • the first registration response message is used to indicate that the core network The device supports the second interoperability.
  • the first registration response message includes a second preset field whose value is the fourth target value; the second preset field whose value is the fourth target value is used for It is used to instruct the core network equipment to support the second interoperation.
  • the first registration response message includes a third preset field whose value is a third target value; the third preset field whose value is a third target value is used for It is used to instruct the core network equipment to support the second interoperation.
  • the first registration request message is used to indicate that the terminal device supports the first interoperation.
  • the first registration request message includes a fourth preset field whose value is the fifth target value; the fourth preset field whose value is the fifth target value is used for To instruct the terminal device to support the first interoperation.
  • the first registration request message is further used to indicate that the terminal device supports the second interoperation.
  • the first registration request message further includes a fifth preset field whose value is the sixth target value; the fifth preset field whose value is the sixth target value It is used to indicate that the terminal device supports the second interoperation.
  • the core network device is the MME in the home network, or the core network device is the AMF in the roaming network.
  • the terminal device when the core network device is an MME in the home 4G network, the terminal device supports the first interoperability through the following steps: when the terminal device moves from the roaming 5G network After arriving at the home 4G network, the terminal device generates an attach request message; the attach request message includes a PDN connection request message, and the request type of the PDN connection request message is handover; no interoperability interface is configured between the roaming 5G network and the home 4G network; the terminal device Send an attach request message to the core network device.
  • the method further includes: the terminal device receives an RRC connection reconfiguration message and an attach response message from the access network device ;
  • the RRC connection reconfiguration message is a message generated after the access network device receives the initial context establishment request message from the core network device; the terminal device sends an attach complete message to the core network device.
  • the method further includes: the terminal device sends a TAU request message to the core network device; the TAU message includes the first GUTI ;
  • the first GUTI is the GUTI obtained from the GUTI mapping of the terminal device in the roaming 5G network; the terminal device receives the TAU rejection message from the core network device.
  • the terminal device when the core network device is an AMF in a roaming 5G network, the terminal device supports the first interoperability through the following steps: when the terminal device moves from the home 4G network After roaming on the 5G network, the terminal device generates a second registration request; the registration type of the second registration request message is mobility registration update; there is no interoperability interface configured between the roaming 5G network and the home 4G network; the terminal device sends to the core network device Second registration request.
  • the method further includes: the terminal device receives a third registration acceptance message from the core network device; the third registration acceptance message is used to indicate that the core network device supports the first interoperation.
  • a core network device including: a processing unit and a communication unit; the processing unit is configured to instruct the communication unit to receive a first registration request message from a terminal device; in response to the first registration request message, the processing unit further It is used to instruct the communication unit to send a first registration response message to the terminal device; the first registration response message is used to indicate that the core network device supports the first interoperability; the first interoperation is used to ensure that the terminal device is not configured on the PLMN network with an interoperable interface Business continuity when moving between.
  • the first registration response message includes the first target value
  • the first preset field the first preset field whose value is the first target value is used to indicate that the core network device supports the first interoperation.
  • the first registration response message includes the second target value
  • the second preset field the second preset field whose value is the second target value is used to indicate that the core network device supports the first interoperation.
  • the first registration response message is also used to indicate that the core network device supports the second interoperation; the second interoperation is used to ensure that the terminal device is configured with an interoperable interface Business continuity during handover within the same PLMN network.
  • the first registration response message further includes a third preset field whose value is the third target value; the third preset field whose value is the third target value It is used to indicate that the core network device supports the second interoperation.
  • the processing unit is further configured to: determine the identifier of the PLMN network to which the terminal device belongs; when the identifier of the PLMN network to which the terminal device belongs is the first preset PLMN network identifier , instructing the communication unit to send the first registration response message to the terminal device.
  • the first registration response message is used to indicate that the core network The device supports the second interoperability.
  • the first registration response message includes a second preset field whose value is the fourth target value; the second preset field whose value is the fourth target value is used for It is used to instruct the core network equipment to support the second interoperation.
  • the first registration response message includes a third preset field whose value is a third target value; the third preset field whose value is a third target value is used for It is used to instruct the core network equipment to support the second interoperation.
  • the first registration request message is used to indicate that the terminal device supports the first interoperation.
  • the first registration request message includes a fourth preset field whose value is the fifth target value; the fourth preset field whose value is the fifth target value is used for To instruct the terminal device to support the first interoperation.
  • the first registration request message is further used to indicate that the terminal device supports the second interoperation.
  • the first registration request message further includes a fifth preset field whose value is the sixth target value; the fifth preset field whose value is the sixth target value It is used to indicate that the terminal device supports the second interoperation.
  • the core network device is the MME in the home network, or the core network device is the AMF in the roaming network.
  • the first registration request message further includes a sixth preset field whose value is the seventh target value, The sixth preset field whose value is the seventh target value is used to indicate that the terminal device supports the N1 interface of the 5G network; if the core network device is an AMF roaming in the 5G network, the first registration request message also includes the value The seventh preset field with eight target values, the seventh preset field with the eighth target value is used to indicate that the terminal device supports the S1 interface of the 4G network.
  • the first registration request message is an Attach Request message sent by the terminal device to the core network device, and the first registration response The message is the Attach Accept message sent by the core network device to the terminal device; if the core network device is an AMF roaming in the 5G network, the first registration request message is the Registration Request message sent by the terminal device to the core network device, and the first registration response message It is the Registration Accept message sent by the core network device to the terminal device.
  • the core network device is an MME in the home 4G network; the processing unit is further configured to: instruct the communication unit to receive an attach request message from the terminal device; wherein, the attach request message It is an attach request message generated after the terminal device moves from the roaming 5G network to the home 4G network; the attach request message includes a PDN connection request message, and the request type of the PDN connection request message is handover; no configuration is made between the roaming 5G network and the home 4G network Interoperability interface; in response to the attach request message, instruct the communication unit to send a location update request message to the HSS+UDM; the location update request message is a location update request message indicating that the HSS+UDM does not initiate a deregistration process to the old AMF; the old AMF is the first Two AMF in the PLMN network; instruct the communication unit to receive a location update response message from HSS+UDM; the location update response message includes the PGWC+SMF FQDN corresponding
  • the processing unit is further configured to: instruct the communication unit to send an initial context establishment request and an attach response message to the access network device; instruct the communication unit to receive the message from the access network device Initial Context Establishment Response message, and Attach Complete message from the end device.
  • the attach response message is used to indicate that the core network device supports the first interoperation.
  • the processing unit is further configured to: instruct the communication unit to receive a TAU request message from the terminal device; the TAU message includes a first GUTI; the first GUTI is the Roaming the GUTI obtained by mapping the GUTI in the 5G network; determining that the context of the terminal device cannot be obtained according to the first GUTI; instructing the communication unit to send a TAU rejection message to the terminal device.
  • the core network device is an AMF in a roaming 5G network
  • the processing unit is also used to: instruct the communication unit to receive the second registration request message from the terminal device; the second registration The request is a registration request generated after the terminal device moves from the home 4G network to the roaming 5G network; the registration type of the second registration request message is mobility registration update; no interoperability interface is configured between the roaming 5G network and the home 4G network; in response to The registration request message instructs the communication unit to send a UDM registration request to HSS+UDM, and the UDM registration request is used to instruct HSS+UDM not to perform location deletion operation; instructs the communication unit to receive the subscription data from the terminal equipment of HSS+UDM; the subscription data includes the following At least one: DNN or APN, and the SMF+PGW-C FQDN connected to the third PDU; according to the DNN or APN and the SMF+PGW-C FQDN connected to the third PDU,
  • the processing unit is further configured to: instruct the communication unit to send a third registration acceptance message to the terminal device; the third registration acceptance message is used to indicate that the core network device supports the first mutual operate.
  • a terminal device including: a processing unit and a communication unit; the processing unit is used to instruct the communication unit to send a first registration request message to the core network device; the processing unit is also used to instruct the communication unit to receive a registration request message from the core network device.
  • the first registration response message of the device; the first registration response message is used to indicate that the core network device supports the first interoperability; the first interoperability is used to ensure the service continuity of the terminal device when it moves between PLMN networks without interoperable interfaces sex.
  • the first registration request message is used to indicate that the terminal device supports the first interoperation.
  • the core network device is an MME in the home 4G network
  • the processing unit is also used to generate an attach request after the terminal device moves from the roaming 5G network to the home 4G network message
  • the attach request message includes a PDN connection request message, and the request type of the PDN connection request message is handover
  • no interoperability interface is configured between the roaming 5G network and the home 4G network
  • the communication unit is instructed to send an attach request message to the core network device.
  • the processing unit is further configured to: instruct the communication unit to receive an RRC connection reconfiguration message and an attachment response message from the access network device; the RRC connection reconfiguration message is an access The message generated after the network device receives the initial context establishment request message from the core network device; instructs the communication unit to send an attach complete message to the core network device.
  • the processing unit is further configured to: instruct the communication unit to send a TAU request message to the core network device; the TAU message includes a first GUTI; the first GUTI is The GUTI obtained by mapping the GUTI in the roaming 5G network; instructs the communication unit to receive the TAU rejection message from the core network device.
  • the core network device is an AMF in a roaming 5G network
  • the processing unit is also used to generate a second Registration request
  • the registration type of the second registration request message is mobility registration update
  • no interoperability interface is configured between the roaming 5G network and the home 4G network
  • the communication unit is instructed to send the second registration request to the core network device.
  • the processing unit is further configured to instruct the communication unit to receive a third registration acceptance message from the core network device; the third registration acceptance message is used to indicate that the core network device supports the first interoperability.
  • 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 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 perform such The first aspect and the communication method described in any possible implementation manner of the first aspect.
  • the present application provides a computer-readable storage medium, in which instructions are stored, and when the instructions in the computer-readable storage medium are executed by the processor of the communication device, the communication device can perform such The communication method described in the second aspect and any possible implementation manner of the second aspect.
  • the core network device instructs the terminal device to support the first interoperability that can ensure service continuity when the terminal device moves between PLMN networks that are not configured with an interoperable interface.
  • the core network device can perform first interoperability by interacting with core network devices in other networks, and migrate the service of the terminal device to other networks, thereby ensuring the security of the terminal device. business continuity.
  • FIG. 1 is a schematic structural diagram of a communication device provided in an embodiment of the present application.
  • FIG. 2 is a schematic diagram of the mobility of a terminal device in 5G core network roaming provided by an embodiment of the present application;
  • FIG. 3 is a schematic diagram of a connection between a home network and a roaming network in a 5G core network roaming scenario provided by an embodiment of the present application;
  • FIG. 4 is a schematic flowchart of a communication method provided by an embodiment of the present application.
  • FIG. 5 is a schematic flowchart of another communication method provided by the embodiment of the present application.
  • FIG. 6 is a schematic flowchart of another communication method provided by the embodiment of the present application.
  • FIG. 7 is a schematic flowchart of another communication method provided by the embodiment of the present application.
  • FIG. 8 is a schematic flowchart of another communication method provided by the embodiment of the present application.
  • FIG. 9 is a schematic flowchart of another communication method provided by the embodiment of the present application.
  • FIG. 10 is a schematic structural diagram of an access network device provided in an embodiment of the present application.
  • FIG. 11 is a schematic structural diagram of a terminal 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.
  • FIG. 1 is a schematic structural diagram of a communication device provided in the embodiment of the present application.
  • the communication device 100 includes at least one processor 101 , a communication line 102 , and at least one communication interface 104 , and may also include a memory 103 .
  • the processor 101 , the memory 103 and the communication interface 104 may be connected through a communication line 102 .
  • the processor 101 may be a central processing unit (central processing unit, CPU), or a specific integrated circuit (application specific integrated circuit, ASIC), or be configured to implement one or more integrated circuits of the embodiments of the present application, For example: one or more digital signal processors (digital signal processor, DSP), or, one or more field programmable gate arrays (field programmable gate array, FPGA).
  • CPU central processing unit
  • ASIC application specific integrated circuit
  • Communication line 102 may include a path for communicating information between the above-described components.
  • the communication interface 104 is used to communicate with other devices or communication networks, and any device such as a transceiver can be used, such as Ethernet, radio access network (radio access network, RAN), wireless local area network (wireless local area networks, WLAN) wait.
  • radio access network radio access network
  • WLAN wireless local area network
  • Memory 103 may be read-only memory (read-only memory, ROM) or other types of static storage devices that can store static information and instructions, random access memory (random access memory, RAM) or other types that can store information and instructions It can also be an electrically erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or can be used to include or store desired program code in the form of instructions or data structures and can be executed by a computer Any other medium accessed, but not limited to.
  • EEPROM electrically erasable programmable read-only memory
  • CD-ROM compact disc read-only memory
  • optical disc storage including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.
  • magnetic disk storage media or other magnetic storage devices or can be used to include or store desired program code in
  • the memory 103 may exist independently of the processor 101, that is, the memory 103 may be a memory outside the processor 101. At this time, the memory 103 may be connected to the processor 101 through the communication line 102 for storing and executing Instructions or application program codes are executed under the control of the processor 101 to implement the communication methods provided in the following embodiments of the present application.
  • the memory 103 can also be integrated with the processor 101, that is, the memory 103 can be an internal memory of the processor 101, for example, the memory 103 is a cache, which can be used to temporarily store some data and instructions information etc.
  • the processor 101 may include one or more CPUs, for example, CPU0 and CPU1 in FIG. 1 .
  • the communications apparatus 100 may include multiple processors, for example, the processor 101 and the processor 107 in FIG. 1 .
  • the communication apparatus 100 may further include an output device 105 and an input device 106 .
  • 5G inter-network roaming refers to a roaming method in which a terminal device belonging to operator B accesses the 5G network of operator A, and operator A provides 5G network services for the terminal device.
  • the operator B is also called the home operator B
  • the operator A is also called the home operator A.
  • 5G inter-network roaming is usually used in scenarios where a certain area is covered by the 5G network of operator A, but not covered by operator A's 5G network.
  • the network construction method based on 5G inter-network roaming can accelerate the current 5G infrastructure construction, reduce the redundant construction of 5G networks, and realize 5G network coverage and business development intensively and efficiently.
  • 5G inter-network roaming includes 5G core network roaming and 5G access network roaming. This application mainly involves 5G core network roaming, and the implementation of 5G core network roaming will be described in detail below.
  • 5G core network roaming refers to the construction of a 5G network (including the construction of access network and core network) built by a certain operator (such as operator A) in a certain network coverage area, then Terminal devices belonging to other operators (operator B) can also access the 5G network built by operator A through roaming, and the 5G network of operator A provides 5G network services for terminal devices belonging to operator B.
  • operator A is marked as a roaming operator
  • operator B is marked as a home operator
  • the network coverage area is marked as a roaming area.
  • 5G core network roaming based on whether the home operator has wireless signals in the roaming area, 5G core network roaming is divided into the following two scenarios.
  • Scenario 1 The home operator does not have any wireless network signals in the roaming area, the roaming operator has 4G or 5G signals in the roaming area, and the terminal device only uses the 5G network of the roaming network.
  • scene 1 includes a spill-out scene and a roam-back scene. In the following, they are explained separately:
  • Roaming scenario When a terminal device enters a roaming area, the terminal device preferentially uses the roaming operator's 5G network to provide the terminal device with roaming services on the 5G network; the roaming operator does not provide the terminal device with roaming services on the 4G network. In this scenario, the roaming operator does not support the voice service of the terminal device falling back to the roaming operator's 4G network.
  • Roaming scenario The user's terminal device leaves the roaming area and searches for the network signal of the home operator (it can be a 4G network signal or a 5G network signal).
  • the terminal equipment returns to the network of the home operator, and the home operator provides network services for the terminal equipment.
  • the terminal device can normally perform voice service fallback.
  • the terminal device of the home operator is only in the 5G network of the roaming network after roaming to the shared area conduct business. In this scenario, the roaming operator will not need to support the service continuity of the terminal equipment.
  • the roaming network when the terminal device moves from the home operator network (hereinafter referred to as the home network) to the roaming operator network (hereinafter referred to as the roaming network), after the terminal device is disconnected from the home network, it takes a long time. It takes time to re-search off-net to re-connect to the roaming network. This may cause the user's ongoing business interruption for a long time and poor user experience.
  • the home operator has a 4G network signal but no 5G network signal in the roaming area, and the roaming operator has a 4G or 5G network in the roaming area.
  • Terminal devices give priority to using the roaming operator's 5G network in the roaming area, and use the home operator's 4G network when the roaming operator's 5G network coverage is insufficient.
  • Scene 2 also includes the overflow scene and the overflow scene, which will be described respectively below.
  • Roaming scenario When a user's terminal device enters a roaming area, the terminal device will preferentially use the roaming operator's 5G network to provide the terminal device with 5G network roaming services. When the roaming operator's 5G network coverage is insufficient, the terminal device uses the home operator's 4G network.
  • Roaming scenario The user's terminal device leaves the roaming area and searches for the network signal of the home operator (it can be a 4G network signal or a 5G network signal).
  • the terminal equipment returns to the network of the home operator, and the home operator provides network services for the terminal equipment.
  • Scenario 2 includes area 1 and area 2, where the home operator's 5G network covers area 1, the roaming operator's 5G network covers area 2 (area 2 is also called roaming area), and the home operator's 4G network covers both The above-mentioned area 1 also covers the above-mentioned area 2 .
  • the movement conditions of the terminal device include at least the following cases 1-4.
  • Case 1 The terminal device moves from the 4G network of the home operator to the 5G network of the roaming operator.
  • Case 3 The terminal device moves from the 5G network of the home operator to the 5G network of the roaming operator.
  • Case 4 The terminal device moves from the roaming operator's 5G network to the home operator's 5G network.
  • FIG. 3 it is a schematic diagram of a connection between a home network and a roaming network in a 5G core network roaming scenario provided by an embodiment of the present application.
  • the home network includes the home operator's 5G core network, the home operator's 4G core network, the home operator's Internet protocol (IP) multimedia system (IP multimedia subsystem, IMS) network, and the home operator's 5G access network. network, and the 4G access network of the operator.
  • IP Internet protocol
  • IMS IP multimedia subsystem
  • the roaming network includes the roaming operator's 5G core network and the roaming operator's 5G access network.
  • the data generated by the terminal device in the roaming network is returned to the home network through home routing, and the service data generated by the terminal device is processed by the home network.
  • the core network of the home network including the home operator's 5G core network (5G Core, 5GC) and the home operator's 4G core network packet core network (evolved packet core, EPC) and roaming network core network (including the roaming operator's 5GC) information
  • the plane is connected through security edge protection proxies (SEEP).
  • SEEP security edge protection proxies
  • the user plane is connected through the edge router through the user plane function (UPF) between the home network and the visited network.
  • UPF user plane function
  • the home network and the roaming network The N32 interface aggregation between SEEP isolates the N8, N12, N16, N24, N27, N31 interfaces between the home network and the roaming network.
  • the interface types and access positions of the above-mentioned interfaces are as shown in the following table 1
  • N26 interface between the home network and the roaming network (the N26 interface between the home mobility management entity (Mobility Management Entity, MME) and the roaming authentication management function (Authentication Management Function, AMF). called N26 interface between hMME and vAMF), and N14 interface (N14 interface between hAMF and vAMF).
  • the interoperability process based on the inter-operator network with the N26 interface and the interoperability process between the inter-operator network without the N26 interface are not defined. This causes the terminal equipment of the home operator to interrupt the original protocol data unit of the terminal equipment when moving between the 4G network of the home network (recorded as the home 4G network) and the 5G network of the roaming operator (represented as the roaming 5G network).
  • PDU Protocol Data Unit
  • this application makes the following extensions to the current network elements, signaling messages and terminal equipment , which are described below.
  • the extension to the network element includes: 1.1, the extension to the AMF, and 1.2, the extension to the MME.
  • the AMF of the 5G network is extended as follows.
  • the N26 interface is configured between the AMF and the MME in the same operator network, and the N26 interface is not configured between the AMF and the MME of different operator networks.
  • the AMF can issue different indication information to the terminal device according to the public land mobile network (PLMN) identifier of the terminal device, indicating the interoperability supported by the AMF.
  • PLMN public land mobile network
  • the AMF issues the ability to support the N26 interface in the network to the terminal device, and supports interoperability based on the N26 interface in the network ( denoted as the second interoperability) capability.
  • the AMF issues the capability of not supporting the inter-network N26 interface and the capability of supporting the first interoperability to the terminal device.
  • the N26 interface support capability and interoperability of AMF can be delivered to the terminal device according to the PLMN ID carried by the terminal device.
  • the N26 interface is configured between the AMF of operator A and the MME in the network of operator A.
  • the AMF of operator A issues support to terminal equipment A.
  • the N26 interface in operator A's network and supports the second interoperability.
  • terminal device A moves between operator A's 4G network and 5G network, it can directly perform 4G and 5G interoperability according to the N26 interface in operator A's network.
  • An N26 interface is configured between the AMF of carrier B and the MME in the network of carrier B.
  • the AMF of carrier B sends support to terminal device B.
  • the N26 interface in the operator B network and supports the second interoperability.
  • terminal device B moves between operator B's 4G network and 5G network, it can directly perform 4G and 5G interoperability according to the N26 interface in operator B's network.
  • the N26 interface is not configured between the AMF of carrier A and the MME of carrier B.
  • the AMF of carrier A sends the unsupported network Inter-N26 interface, and support the first interoperability.
  • terminal device B moves between operator A's 5G network and operator B's 4G network, the first interoperability capability performs a mobility procedure for terminal device B.
  • the N26 interface is configured between the MME and the AMF in the same operator's network, and the N26 interface is not configured between the MME and the AMF of a different operator's network.
  • the MME may issue different indication information to the terminal device according to the PLMN identifier of the terminal device, indicating the interoperability supported by the MME.
  • the MME issues to the terminal device the support for the N26 interface in the network and the interoperability based on the N26 interface in the network.
  • the MME also issues to the terminal equipment the capability of not supporting the N26 interface between networks and supporting the first interoperability.
  • the N26 interface support capability and interoperability of the MM may be delivered to the terminal device according to the PLMN identifier carried by the terminal device.
  • the N26 interface is configured between the MME of operator A and the AMF in the network of operator A.
  • the MME of operator A issues support to terminal equipment A.
  • the N26 interface in operator A's network and supports the second interoperability.
  • terminal device A moves between operator A's 4G network and 5G network, it can directly perform 4G and 5G interoperability according to the N26 interface in operator A's network.
  • the N26 interface is configured between the MME of operator B and the AMF in the network of operator B.
  • the MME of operator B issues support to terminal equipment B.
  • the N26 interface in the operator B network and supports the second interoperability.
  • terminal device B moves between operator B's 4G network and 5G network, it can directly perform 4G and 5G interoperability according to the N26 interface in operator B's network.
  • the N26 interface is not configured between the MME of carrier B and the AMF in the network of carrier A.
  • the MME of carrier B sends an Support the N26 interface between networks, and support the first interoperability.
  • the first interoperability capability performs a mobility procedure for terminal device B.
  • terminal device B When terminal device B moves from operator A's 5G network to operator B's 4G network, terminal device B will send a tracking area update (Tracking Area Update, TAU) message, the TAU message carries the evolved packet system (Evolved Packet System, EPS)-Globally Unique Temporary Identity (Globally Unique Temporary Identity, GUTI), the EPS-GUTI is from the terminal device in the 5G network of operator A 5G-GUTI mapping obtained.
  • EPS evolved Packet System
  • GUTI Globally Unique Temporary Identity
  • the hMME determines that the type of the old MME that the terminal device triggers the TAU process is AMF, and according to the most recently accessed TAI in the TAU message, it is determined that there is no N26 interface between the operator before the terminal device moves and the operator to which the MME belongs, and the MEE sends The terminal device sends a TAU reject (TAU reject) message. In this way, the terminal device can migrate the PDU session of the terminal device in the roaming 5G network to the home 4G network by initiating an attach request.
  • TAU reject TAU reject
  • the extension of the signaling message includes: 2.1, 5G signaling message extension, and 2.2, 4G signaling message extension. Each will be described below.
  • the extension of 5G signaling it is mainly to extend the registration message exchanged between the terminal device and the AMF.
  • the signaling message sent by the extended terminal device to the AMF is used to indicate whether the terminal device supports the first interoperability procedure, and the signaling message sent by the extended AMF to the terminal device indicates whether the AMF supports the first interoperability procedure.
  • the extension of the 5G signaling message includes: 2.1.1, the extension of the registration request (Registration Request) message, and 2.1.2, the extension of the registration response (Registration Accept) message. Each will be described below.
  • the registration request message is a request message sent by the terminal device to the AMF of the 5G network for requesting registration.
  • the registration request message may be extended to indicate whether the terminal device supports the first interoperation.
  • the registration request message may also be extended to indicate whether the terminal device supports the second interoperation.
  • the HO_attach_inter PLMN field is extended in the registration request message to indicate whether the terminal device supports the first interoperation.
  • the HO_attach_intra PLMN field is extended in the registration request message to indicate whether the terminal device is supporting the second interoperability.
  • the HO_attach_intra PLMN field can reuse the H0_attach indicator bit in the current 5GMM Capability field. That is to say, the H0_attach indication bit in the 5GMM Capability field is extended to the HO_attach_intra PLMN field.
  • the HO_attach_inter PLMN field can be selected from the bits reserved in the 5GMM Capability field (for example, it can be bits 5-8 of the 5th byte and bits reserved for bytes 6-15) As an indication bit of the HO_attach_inter PLMN field.
  • the 5GMM Capability field is mainly used to identify the capability support when interoperating with 4G EPS; the H0_attach indicator bit (the second bit of the third byte) is used to indicate whether the terminal supports the Handover (Handover) type of attach (attach ).
  • the current H0_attach indicator bit is mainly used in the scenario where the single-registration terminal works without the N26 interface, indicating whether the terminal device supports the PLMN internal interoperability process without the N26 interface.
  • the terminal device supports ATTACH REQUEST across PLMNs without N26 interface.
  • the ATTACH REQUEST includes the PDN CONNECTIVITY REQUEST message, the request type of which is set to "handover” or "handover of emergency bearer services", which is used to transfer the PDU session from the N1 interface to the S1 interface.
  • PDN CONNECTIVITY REQUEST message containing PDN CONNECTIVITY REQUEST message with request type set to "handover” or "handover of emergency bearer services” to transfer PDU session from N1 mode to S1 mode not supported
  • HO_attach_inter PLMN field When the value of the HO_attach_inter PLMN field is "1", this field is used to indicate that the terminal device does not support the first interoperation. At this time, the terminal device does not support ATTACH REQUEST across PLMNs without N26 interface.
  • ATTACH REQUEST can refer to the previous description, so I won’t go into details here.
  • the extension of the registration request (Registration Request) message is an optional solution.
  • the registration request (Registration Request) message may not be extended, and the terminal device can directly download the registration request according to the network device The registration response (Registration Acceptt) sent for the first interoperability.
  • the registration response message is a message sent by the AMF to the terminal device after receiving the registration request message from the terminal device.
  • the registration response message may be extended to indicate that the AMF does not support the N26 interface, and the AMF supports the first interoperation.
  • An example is to extend the Iwk_n26_intra PLMN field in the registration response message to indicate whether the AMF supports the second interoperation. Extend the Iwk_n26_inter PLMN field in the registration response message to indicate that the AMF supports the first interoperability.
  • the Iwk_n26_intra PLMN field can reuse the Iwk_n26 (bit 7 of the third byte) indication bit of the 5GS network feature support field in the current Registration Accept message. That is to say, the Iwk_n26 indication bit in the 5GS network feature support field is extended to the Iwk_n26_intra PLMN field.
  • the Iwk_n26_inter PLMN field can select a bit from the bits reserved in the 5GS network feature support field (for example, the 4-8 bits of the fifth byte) as the indicator bit of the Iwk_n26_inter PLMN field.
  • N26 interfaces are usually only configured within the network of the same operator, without considering the configuration of N26 interfaces between different operator networks, so the current Iwk_n26 indication in the 5GS network feature support field is used to indicate whether the network device supports Interoperability of N26 interfaces (specifically refers to N26 interfaces within the network of the same operator).
  • the Iwk_n26 is extended to the Iwk_n26_intra PLMN field, and the Iwk_n26_inter PLMN field indicating the first interoperation is added at the same time.
  • the attachment message exchanged between the terminal equipment and the MME is mainly extended.
  • the extended signaling message sent by the terminal device to the MME is used to indicate whether the terminal device supports a cross-PLMN N1 interface (N1 mode), and the N1 interface is a 5G network interface.
  • the signaling message sent by the extended MME to the terminal device is used to indicate whether the MME supports the first interoperation.
  • the extension of the 4G signaling message includes: 2.2.1, the extension of the Attach Request (Attach Request) message, and 2.2.2, the extension of the Attach Response (Attach Accept) message. Each will be described below.
  • the attach request message is a request message sent by the terminal device to the MME of the 4G network for requesting registration.
  • the N1 interface used to indicate whether the terminal device supports cross-PLMN can be extended in the attach request message.
  • N1 interface indication bit N1mode.
  • this indicator bit is mainly used to indicate whether the terminal device supports the N1 interface of the PLMN content.
  • the field used to indicate whether to support the N1 interface across PLMNs is extended in the reserved bits of the UE network capability field (for example, the 6-8 bits and the 11th byte of the 10th byte).
  • the value of this field is 0, it means that the terminal device does not support the N1 interface across PLMNs.
  • the value of this field is 1, it indicates that the terminal device supports the N1 interface across PLMNs.
  • the attach response message is a message sent by the MME to the terminal device after receiving the attach request message from the terminal device.
  • the attachment response message may be extended to indicate that the MME supports the first interoperation.
  • An example is to extend the Iwk_n26_intra PLMN field in the attach response message to indicate whether the MME supports the second interoperation. Extend the Iwk_n26_inter PLMN field in the Attach Response message to indicate that the MME supports the first interoperation.
  • the Iwk_n26_intra PLMN can multiplex the Iwk_n26 indicator bit (the seventh bit of the fourth byte) with the EPS network feature support field in the current Attach Accept message. That is to say, the Iwk_n26 indication bit of the EPS network feature support field is extended to the Iwk_n26_intra PLMN field.
  • the EPS network feature support field is a field including 4 bytes, which is mainly used to indicate the capabilities supported by the MME when interoperating with the 3G network or 5G network.
  • the EPS network feature support field can be extended to 5 bytes, and in the expanded fifth byte, a bit is selected as the Iwk_n26_inter PLMN field indicator bit.
  • Iwk_n26_intra PLMN field when the value of the Iwk_n26_intra PLMN field is "0", this field is used to indicate that the MME does not support the second interoperation. When the value of the Iwk_n26_intra PLMN field is "1”, this field is used to indicate that the AMF supports the second interoperation.
  • the Iwk_n26_intra PLMN field can also be used to indicate whether the network element supports the N26 interface in the same PLMN (that is, between the AMF and the MME in the same PLMN Whether it is equipped with N26 interface).
  • the value of the Iwk_n26_intra PLMN field is "0"
  • this field is also used to indicate that the N26 interface is not configured between the MME and the AMF in the same PLMN (or, the N26 interface is not configured between the AMF and the MME in the same PLMN) .
  • the value of the Iwk_n26_intra PLMN field is "1”
  • this field is also used to indicate that an N26 interface is configured between the MME and the AMF in the same PLMN (or, an N26 interface is configured between the AMF and the MME in the same PLMN).
  • the Iwk_n26_inter PLMN field is not only used to indicate whether the network element supports the first interoperability, but also can be used to indicate whether the network element supports the N26 interface across the PLMN (that is, whether the N26 interface is configured between the AMF and the MME across the PLMN). interface).
  • the value of the Iwk_n26_inter PLMN field is "0" this field is used to indicate that no N26 interface is configured between the AMF and the inter-PLMN MME (or, no N26 interface is configured between the MME and the inter-PLMN AMF).
  • the value of the Iwk_n26_inter PLMN field is "1" this field is used to indicate that an N26 interface is configured between the AMF and the inter-PLMN MME (or, an N26 interface is configured between the MME and the inter-PLMN AMF).
  • the HO_attach_inter PLMN field and the HO_attach_intra PLMN field can also be understood by referring to the above-mentioned Iwk_n26_inter PLMN field and Iwk_n26_intra PLMN field, and this application will not repeat them.
  • the terminal device needs to support the above-mentioned extended signaling message.
  • the terminal device can generate a corresponding signaling message to indicate the capability supported by the terminal device to the network device, and determine the capability supported by the network device according to the extended signaling message delivered by the network device.
  • the terminal device may also execute the first interoperability procedure according to the capabilities supported by the terminal device and the network device.
  • the terminal device needs to extend and support the extended registration request message and the extended registration response message.
  • this application extends the terminal device so that the terminal device can generate the extended registration request message, and the terminal device sets the S1 interface to 1, indicating that the terminal device supports the interface of the 4G network.
  • this application extends the terminal device so that the terminal device can recognize the indicator bits of Iwk_n26_intra PLMN and Iwk_n26_inter PLMN in the field of 5GS network feature support in the Registration Accept message, and determine according to the value of the indicator bit Whether AMF supports first interoperability.
  • the terminal device determines that the AMF does not support the N26 interface across PLMNs. The terminal device needs to execute the first interoperability procedure to maintain service continuity of the terminal device.
  • the terminal device sends an Initial Attach (Initial Attach) message to the MME, the carried request type (Request type) is Handover (Handover), and the initial attach message includes the data network name (Data network name, DNN) Or access point name (Access Point Name, APN), PDU Session ID, PDN CONNECTIVITY Request message, EPS bearer status is set to empty.
  • Initial Attach Initial Attach
  • DNN Data network name
  • APN Access Point Name
  • PDU Session ID PDN CONNECTIVITY Request message
  • EPS bearer status is set to empty.
  • the terminal device needs to expand and support the extended attachment request message and the extended attachment response message.
  • the present application extends the terminal device so that the extended terminal device can generate a field for indicating whether to support the cross-PLMN N1 interface.
  • this application extends the terminal device so that the extended terminal device can recognize the indication bits of Iwk_n26_intra PLMN and Iwk_n26_inter PLMN in the EPS network feature support field in Attach Accept.
  • the terminal device For its specific extension, refer to the extension of the terminal device for 5G signaling messages in 3.1 above, which will not be repeated this time.
  • AMF may not extend the ability to identify and generate the Iwk_n26_intra PLMN field and the Iwk_n26_inter PLMN field.
  • the AMF only needs to expand the PLMN or IMSI number segment that identifies the terminal device, and deliver the Iwk_n26 field with different values to the terminal device according to the PLMN or IMSI number segment.
  • the AMF for the terminal equipment of the same operator (for example, the AMF is the AMF of operator A, and the terminal equipment is also the terminal equipment of operator A), the AMF sends the second preset field with the fourth target value, It is used to indicate that the AMF supports the second interoperability.
  • the AMF issues a second preset field whose value is the second target value. It is used to indicate that the AMF supports the first interoperability.
  • the value of the second target value is 0, the value of the fourth target value is 1, and the second preset field is the Iwk_n26 field.
  • the AMF issues a second preset field whose value is the fourth target value to the terminal device, and is used to indicate that the AMF supports the N26 interface within the same operator, and supports the second interoperability.
  • the terminal equipment When the terminal equipment and AMF are different operators, the terminal equipment will not move to the operator's 4G network. At this time, AMF only needs to support the first interoperability for the terminal equipment, and does not need to support the terminal equipment for the terminal equipment. The second interoperability. Therefore, the AMF issues a second preset field whose value is the second target value to the terminal device, and is used to indicate that the AMF does not support the cross-PLMN N26 interface and supports the first interoperation.
  • the application may not extend the Iwk_n26 field to the Iwk_n26_intra PLMN field, and does not need to add the Iwk_n26_inter PLMN field at the same time.
  • the terminal device does not need to extend the H0_attach field to the HO_attach_intra PLMN field, and add a new HO_attach_inter PLMN field.
  • the terminal device only needs to set the value of the H0_attach field to 1, indicating that the terminal device supports the H0_attach capability, and the interoperability (including the first to fourth interoperability) supported by the terminal pole device can be issued to the terminal device through AMF
  • the Iwk_n26 field or the Iwk_n26_intra PLMN field and the Iwk_n26_inter PLMN field are implemented.
  • the first interoperability is used to ensure service continuity when the terminal device moves between PLMN networks that are not configured with an interoperability interface.
  • the first interoperation is used to indicate that the first interoperation between two PLMN networks that do not have an interoperation interface configured is supported.
  • the first interoperation may specifically be cross-PLMN interoperation without an N26 interface. For example, interoperability between roaming 5G network and home 4G network without N26 interface configured.
  • the second interoperability is used to ensure the service continuity when the terminal equipment switches in the same PLMN network configured with the interoperability interface.
  • the second interoperability is used to indicate that interoperability within the same PLMN configured with the N26 interface is supported.
  • the second interoperation may specifically be interoperation within the same PLMN with the N26 interface. For example, interoperability between a home 4G network and a home 5G network configured with an N26 interface.
  • the third interoperation is used to ensure the service continuity when the terminal equipment moves between the PLMN networks configured with the interoperation interface.
  • the first interoperation is used to indicate that the third interoperation between the two PLMN networks configured with the interoperation interface is supported.
  • the third interoperation may specifically be cross-PLMN interoperation with an N26 interface. For example, interoperability between a roaming 5G network configured with an N26 interface and a home 4G network.
  • the case of not supporting the first interoperation includes the case of supporting the third interoperation.
  • the fourth interoperability is used to ensure the service continuity when the terminal equipment is switched in the same PLMN network without an interoperability interface configured.
  • the fourth interoperation is used to indicate that the interoperation in the same PLMN that is not configured with the N26 interface is supported.
  • the fourth interoperation may specifically be interoperation within the same PLMN without the N26 interface. For example, the interoperability between the home 4G network and the home 5G network where the N26 interface is not configured.
  • the case of not supporting the second interoperation includes the case of supporting the fourth interoperation.
  • the communication method provided by this application includes the following S401-S402:
  • the terminal device sends a first registration request message to the core network device.
  • the core network device receives the first registration request message from the terminal device.
  • the core network device may be an MME in a 4G network, or the core network device may also be an AMF in a 5G network.
  • the core network device is an MME in the 4G core network
  • the first registration request message is an Attach Request message sent by the terminal device to the MME.
  • S401 can be specifically implemented as: the terminal device sends an Attach Request message to the access network device (for example, eNodeB) of the 4G network, and the access network device forwards the Attach Request message to the MME after receiving the Attach Request message.
  • the access network device for example, eNodeB
  • the core network device is the AMF in the 5G core network.
  • the first registration request message is a Registration Request message sent by the terminal device to the AMF.
  • S401 can be specifically implemented as: the terminal device sends a Registration Request message to an access network device (for example, a 5G base station) of the 5G network. After receiving the Registration Request message, the access network device sends the Registration Request message to the AMF.
  • an access network device for example, a 5G base station
  • the core network device In response to the first registration request message, the core network device sends a first registration response message to the terminal device.
  • the terminal device receives the first registration response message from the core network device.
  • the first registration response message is used to indicate that the core network equipment supports the first interoperation; the first interoperation is used to ensure the service continuity when the terminal equipment moves between PLMN networks that are not configured with an interoperation interface.
  • S402 may specifically be implemented as: the MME sends an Attach Accept message to the access network device. After receiving the Attach Accept message, the access network device sends an Attach Accept message to the terminal device.
  • S402 may specifically be implemented as: the AMF sends a Registration Accept message to the access network device. After receiving the Registration Accept message, the access network device sends a Registration Accept message to the terminal device.
  • the core network device instructs the terminal device to support the service continuity when the terminal device moves between PLMN networks without interoperable interfaces.
  • Sexual first interoperability In this way, when a terminal device moves from this network to another network, the core network device can perform first interoperability by interacting with core network devices in other networks, and migrate the service of the terminal device to other networks, thereby ensuring the security of the terminal device. business continuity.
  • the reception of the registration request message by the AMF roaming the 5G network includes the following two situations, namely: Case 1, AMF receives a registration request from a terminal device of the same operator; Case 2, AMF receives Registration requests to terminal devices from different operators.
  • the AMF may only extend the delivery of different Iwk_n26 fields to the terminal device according to the PLMN (or IMSI number segment) of the terminal pole device.
  • the method further includes:
  • the core network device determines the identifier of the PLMN network to which the terminal device belongs.
  • the core network device sends a first registration response message to the terminal device.
  • the first registration response message is used to indicate that the core network device supports the first interoperation.
  • the first preset PLMN network identifier is an identifier different from the PLMN network identifier of the operator to which the core network device belongs.
  • the AMF sends a registration response message supporting the first interoperability capability to the terminal devices.
  • the terminal equipment moves from the current network to the home 4G network, it can be moved through the first interoperability procedure, so as to maintain the service continuity of the terminal equipment.
  • the first registration response message includes a second preset field whose value is the second target value.
  • the core network device sends a first registration response message to the terminal device.
  • the first registration response message is used to indicate that the core network device supports the second interoperation.
  • the second preset PLMN network identifier is the same identifier as the PLMN network identifier of the operator to which the core network equipment belongs.
  • the AMF sends a registration response message supporting the second interoperability capability to the terminal equipment.
  • the terminal equipment moves from the current network to the 4G network of the same operator, it can be moved through the second interoperability procedure, so as to maintain the service continuity of the terminal equipment.
  • AMF sends the first registration response message supporting the second interoperability to terminal devices of the same PLMN network, and sends the first registration response message supporting the first interoperation to terminal devices of different PLMN networks information.
  • Iwk_n26 field only the meanings of different values of the Iwk_n26 field can be extended, without excessive expansion of the specific fields of the network element signaling and the capabilities of the AMF, reducing the workload of the extended network element.
  • the registration response message is used to indicate whether the core network device supports the first interoperation.
  • the first registration response message includes a first preset field whose value is the first target value; the first field whose value is the first target value
  • the preset field is used to indicate that the core network device supports the first interoperation.
  • the value of the first target value is 0, and the first preset field is the Iwk_n26_inter PLMN field.
  • the first registration response message may further include a third preset field whose value is the third target value; the third preset field whose value is the third target value is used to indicate that the core network device supports the second interoperation.
  • the value of the third target value is 1, and the third preset field is the Iwk_n26_intra PLMN field.
  • This implementation manner is applicable to various scenarios where the core network device is an MME or the core network device is an AMF.
  • the first registration response message includes a second preset field whose value is a second target value; the second preset field whose value is a second target value is used to indicate that the core network device supports First interoperability.
  • the first response message is an Attach Accept message sent by the MME to the terminal device.
  • the first response message is the Registration Accept message sent by the AMF to the terminal device.
  • the first registration response message is used to indicate that the core network device supports the second interoperation.
  • the second registration response message is used to indicate that the core network device supports the second interoperation.
  • the second registration response message includes an Iwk_n26 field with a value of 1; the Iwk_n26 field with a value of 1 is used to indicate that the core network device supports the second interoperation.
  • the second registration response message includes an Iwkn26_intra PLMN field with a value of 1; the Iwkn26_intra PLMN field with a value of 1 is used to indicate that the core network device supports the second interoperation.
  • the first response message is an Attach Accept message sent by the MME to the terminal device.
  • the first response message is the Registration Accept message sent by the AMF to the terminal device.
  • the difference between the first registration response message and the second registration response message is that the values of the Iwk_n26 field or the Iwkn26_intra PLMN field included in the two messages are different.
  • the first registration response message and the second registration response message may be messages carried in the same registration response message (for example, collectively referred to as the first registration response message), for terminals of different PLMN networks,
  • the registration response message indicates different meanings. For example, when the terminal device and the core network device belong to different PLMN networks (or the identifier of the PLMN network to which the terminal device belongs is the first preset PLMN network identifier), the first registration response message is used to indicate that the core network device supports the first mutual operate.
  • the first registration response message is used to indicate that the core network device supports the second interoperability. This application will not repeat it here.
  • the first registration request message is used to indicate that the terminal device supports the first interoperation.
  • the first registration request message includes a fourth preset field whose value is the fifth target value; the fourth preset field whose value is the fifth target value is used to indicate that the terminal device supports the first interoperability.
  • the value of the fifth target value is 1, and the fourth preset field is the HO_attach_inter PLMN field.
  • the first registration request message is also used to indicate that the terminal device supports the second interoperation.
  • the first registration request message further includes a fifth preset field whose value is the sixth target value; the fifth preset field whose value is the sixth target value is used to indicate that the terminal device supports the sixth target value. Two interoperability.
  • the value of the sixth target value is 1, and the fifth preset field is the HO_attach_intra PLMN field.
  • the first registration request message also includes a sixth preset field whose value is the seventh target value, and the sixth preset field whose value is the seventh target value is used to indicate
  • the terminal device supports the N1 interface of the 5G network; at this time, the first registration request message is an Attach Request message sent by the terminal device to the MME.
  • the value of the seventh target value is 1, and the sixth preset field is the N1_mode field.
  • the first registration request message also includes a seventh preset field with a value of the eighth target value, and the seventh preset field with a value of the eighth target value is used to indicate the terminal
  • the device supports the S1 interface of the 4G network.
  • the first registration request message is a Registration Request message sent by the terminal device to the AMF.
  • the value of the eighth target value is 1, and the seventh preset field is the S1_mode field.
  • the first interoperability process provided by this application includes at least the following scenarios 1 and 2. They are: Scenario 1, the terminal device moves from the roaming 5G network to the home 4G network; Scenario 2, the terminal device moves from the home 4G network to the roaming 5G network. The following describes scenario 1 and scenario 2 in detail respectively.
  • Scenario 1 The terminal device moves from the roaming 5G network to the home 4G network.
  • the first interoperability process may be implemented through S601-S604 as shown in FIG. 6 .
  • the terminal device sends an attach request message to the MME.
  • the MME receives the attach request message from the terminal device.
  • the attach request message is an attach request message generated after the terminal device moves from the roaming 5G network to the home 4G network; the attach request message includes a PDN connection request message, and the request type of the PDN connection request message is handover; the roaming 5G network and the home 4G network Interoperable interfaces are not configured between networks.
  • the attach request message includes a PDN connection request message
  • the request type of the PDN connection request message is set to "handover (handover)" or "handover of emergency bearer services", which is used to connect the PDU session Transfer from N1 interface to S1 interface.
  • the attach request message further includes at least one of the following parameters: DNN or APN, PDU Session ID in PCO.
  • the core network device sends a location update request message to the home subscriber server (Home Subscriber Server, HSS)+unified data management function (Unified Data Management, UDM).
  • HSS Home Subscriber Server
  • UDM Unified Data Management
  • the HSS+UDM receives the location update request message from the terminal device.
  • the location update request message is a location update request message indicating that the HSS+UDM does not initiate a deregistration process to the old AMF; the old AMF is the AMF in the second PLMN network.
  • the HSS+UDM sends a location update response message to the core network device.
  • the core network device receives the location update response message from the HSS+UDM.
  • the location update response message includes the fully qualified domain name (Fully Qualified Domain Name, FQDN) of the gateway control plane (PDN Gateway Controlplane function, PGWC) + session management function (Session Management Function, AMF) corresponding to the first PDU session.
  • FQDN Fully Qualified Domain Name
  • PGWC Gateway Controlplane function
  • AMF Session Management Function
  • the core network device initiates a PDU creation session process according to the PGWC+SMF FQDN.
  • the PDU session creation process is used to establish a second PDU session in the first PLMN network, and associate the first PDU session with the second PDU session.
  • the terminal device moves from the roaming 5G network to the home 4G network, the terminal device generates an attach request message, and the attach request message includes a PDN connection request whose request type is handover. Based on the attach request message, the MME can obtain the PGWC+SMF FQDN corresponding to the first PDU session of the terminal device from the HSS+UDM, and then enable the MME to associate the first PDU session with the PGWC+SMF FQDN corresponding to the first PDU session. In the home 4G network, the migration of the first PDU session is completed, ensuring the service continuity of the terminal equipment.
  • the cross-PLMN interoperability process based on the non-N26 interface includes the following S701-S717.
  • the terminal device sends a TAU request message to the access network device.
  • the access network device receives the TAU request message from the terminal device.
  • the access network device refers to the access network device in the home 4G network, such as eNodeB.
  • the TAU request message includes the 4G-GUTI mapped from the 5G-GUTI of the terminal device roaming in the 5G network.
  • the access network device sends a TAU request message to the MME.
  • the MME receives the TAU request message from the access network device.
  • the MME sends a TAU rejection message to the terminal device.
  • the terminal device receives the TAU rejection message from the MME.
  • the TAU rejection message is a TAU Reject message.
  • the TAU Reject message carries information such as EMM Cause (#9 network cannot obtain UE identity).
  • the MME After the MME receives the TAU request message from the terminal device, it determines according to the 4G-GUTI in the TAU request message that the MME cannot obtain the MM context information of the terminal device, and at this time the MME sends a TAU Reject message to the terminal device.
  • the MME sends a TAU rejection message to the terminal device through the access network device.
  • the terminal device roaming to the roaming 5G network needs to maintain session continuity (that is, IP continuity), and the terminal device registers with the roaming network access network device In the 5GMM Capability field carried in the Registration Request sent by the core network device, set HO_attach to 1.
  • the core network device of the roaming network indicates to the terminal device that the core network device supports the first interoperability in the 5GS network feature support field carried in the Registration Accept message.
  • the terminal device may perform the above steps in S701-S703.
  • the terminal device access network device sends an attach request message.
  • the access network device receives the attach request message from the terminal device.
  • the access network device sends an attach request message to the MME.
  • the MME receives the attach request message from the terminal device.
  • the MME performs a security authentication process on the terminal device according to the attach request message.
  • the MME can also check the Equipment ID of the terminal equipment.
  • the MME sends a location area update request message to the HSS+UDM.
  • the HSS+UDM receives the location area update request message from the MME.
  • the location area update request message is a Location Update Request message.
  • the Location Update Request message in the embodiment of the present application does not include the initial attach indication bit. Therefore, HSS+UDM will not initiate the deregistration process to the old AMF.
  • the HSS+UDM returns a location area update response message to the MME.
  • the MME receives the location area update response message from the HSS+UDM.
  • the location area update response message includes the subscription information of the terminal device and the corresponding PGWC+SMF FQDN of the terminal device.
  • the terminal device when the terminal device is in the connected state, when the terminal device establishes a PDU session in the roaming 5G network, it will notify the HSS+UDM of the selected PGWC+SMF FQDN.
  • the MME of the home 4G network cannot directly obtain the context information of the terminal device from the AMF of the roaming 5G network (that is, The IP address or FQDN of the PGWC+SMF selected by the terminal device when establishing a PDU session in the roaming 5G network cannot be obtained).
  • the MME can obtain the PGWC+SMF FQDN of the terminal device from the HSS+UDM, so that the MME can migrate the PDU session established by the terminal device in the roaming 5G network to the home 4G network to keep the terminal The continuity of the IP address of the equipment business, and the continuity of the business.
  • HSS+UDM will initiate a deregistration process to the old AMF, so that the PDU session established by the terminal device in 5G roaming will be deleted, and the PDU session established by the terminal device in 5G roaming will not be able to be registered.
  • the session is migrated to the home 4G network.
  • the MME determines the P-GW and the S-GW, and then completes the process of migrating the PDU session of the terminal device in the roaming 5G network to the home 4G network.
  • the MME completes the process of creating sessions with the P-GW and the S-GW.
  • PGW-C+SMF associates the 5G PDU Session of the PDU session of the terminal device in the roaming 5G network according to the PDU Session ID in PCO of the created session.
  • the MME sends an initial context setup request (Initial Context Setup Request) message to the access network device.
  • the message may also include an attach response message. If the terminal device identifies that the terminal device supports 5GC NAS in the attached request sent, the attach response message includes an indication that the MME supports cross-PLMN interoperability procedures without an N26 interface. In this way, if the terminal device subsequently moves from the home 4G network to the roaming 5G network, the terminal device can perform a cross-PLMN interoperability process from home 4G to roaming 5G without the N26 interface according to the instruction. Wherein, the process may refer to the prior art, which is not limited in the present application.
  • the core network device sends an initial context establishment request and an attach response message to the access network device.
  • the access network device receives the initial context establishment request and the attach response message from the core network device.
  • the attach response message is used to indicate that the core network device supports the first interoperation.
  • the access network device sends an RRC connection reconfiguration message and an attach response message to the terminal device.
  • the access network device sends an initial context establishment response message to the core network device.
  • the core network device receives the initial context establishment response message from the access network device.
  • the terminal device sends an attach complete message to the core network device.
  • the core network device receives the attachment completion message from the terminal device.
  • the MME sends a notification request message to the HSS+UDM.
  • the HSS+UDM receives the notification request from the MME.
  • the notification request is a Notify Request message.
  • the Notify Request message includes at least: APN/DNN and PGW-C+SMF FQDN.
  • the terminal device sends a notification request to HSS+UDM.
  • the HSS+UDM sends a notification response message to the MME.
  • the notification response message is a Notify Response message.
  • the terminal device initiates a process of requesting a PDN connection.
  • the request type for requesting the PDN connection process is handover.
  • the sessions other than the IMS session of the terminal device in the roaming 5G network are also migrated to the home 4G network.
  • the terminal device initiates the request PDN connection process described in S716. If the terminal device does not have a session other than the IMS session in the roaming 5G network, the terminal device does not initiate the process of requesting a PDN connection described in S716.
  • SMF+PGW-C instructs the core network of the roaming 5G network to release the PDU session whose migration is completed.
  • the SMF+PGW-C determines the PDU sessions that have been migrated by the terminal device, and instructs the core network of the roaming 5G network to release these migrated PDU sessions.
  • Scenario 2 The terminal device moves from the home 4G network to the roaming 5G network.
  • the first interoperability process may be implemented through S801-S805 as shown in FIG. 8 .
  • the terminal device sends a second registration request message to the core network device.
  • the core network device receives the second registration request message from the terminal device.
  • the second registration request is a registration request generated after the terminal device moves from the home 4G network to the roaming 5G network; the registration type of the second registration request message is mobility registration update; no interoperability interface is configured between the roaming 5G network and the home 4G network ;
  • the core network device sends a UDM registration request to the HSS+UDM.
  • the HSS+UDM receives the UDM registration request from the terminal device.
  • the UDM registration request is used to instruct HSS+UDM not to delete the location
  • the HSS+UDM sends the subscription data of the terminal device to the core network device.
  • the core network equipment receives the subscription data from the HSS+UDM terminal equipment.
  • the subscription data includes at least one of the following: DNN or APN, and the SMF+PGW-C FQDN of the third PDU connection;
  • the core network device initiates a fourth PDU session establishment process according to the DNN or APN and the SMF+PGW-C FQDN connected to the third PDU.
  • the procedure for establishing the fourth PDU session is used to establish the fourth PDU session in the second PLMN network, and associate the third PDU session with the fourth PDU session.
  • the core network device sends a third registration acceptance message to the terminal device.
  • the terminal device receives the third registration acceptance message from the core network device.
  • the third registration acceptance message is used to indicate that the core network device supports the first interoperation.
  • the terminal device moves from the home 4G network to the roaming 5G network, the terminal device generates a second registration request message, and the registration type of the second registration request message is mobility registration update. Based on the second registration request message, the AMF can obtain the SMF+PGW-C FQDN of the third PDU connection from the HSS+UDM. In turn, AMF can associate the third PDU session with the roaming 5G network according to the PGWC+SMF FQDN corresponding to the third PDU session, complete the migration of the third PDU session, and ensure the service continuity of the terminal device.
  • the first interoperation process includes the following S901-S915.
  • the terminal device sends a registration request message to the access network device.
  • the registration request is: registration request.
  • the registration type of the registration request is "mobility registration update”.
  • the registration request message includes at least one of the following items: the 5G-GUTI mapped from the terminal device in the 4G-GUTI in the home 4G network, at least one requested S-NSSAIs, the established PDN connection associated with the terminal device and the mapped PDU session ID.
  • the access network device performs AMF selection.
  • the access network device sends a registration request to the AMF.
  • the AMF receives the registration request from the access network device.
  • the AMF is an AMF determined after the access network device performs AMF selection. Since the AMF is an AMF in the roaming network of the terminal device, the AMF is also called a vAMF.
  • the AMF performs security authentication on the terminal device.
  • AMF checks the Equipment ID of the terminal equipment.
  • the AMF is an AMF supporting the first interoperability procedure. Therefore, after the AMF receives the terminal device and determines that the terminal device is a terminal device that has moved from the home 4G network to the PLMN network, the AMF determines that it is necessary to migrate the PDU session of the terminal device in the home 4G network to the roaming 5G network , the AMF does not execute the process of synchronizing the PDU session status of the terminal device in the prior art (PDU Session status synchronization), and ignores the process of obtaining the context of the terminal device from the old MME.
  • PDU Session status synchronization PDU Session status synchronization
  • the AMF initiates a UDM registration request to the HSS+UDM.
  • the HSS+UDM receives the UDM registration request from the AMF.
  • the UDM registration request is: Nudm_UECM_Registration Request.
  • the UDM registration request is used to indicate the registration initiated from the MME during this registration.
  • the HSS+UDM initiates a location deletion operation to delete the location information of the terminal device, which will prevent the terminal device from maintaining the EPC registration status.
  • the MME will implicitly log off the terminal device, and at the same time release the PDN connection reserved to the terminal device, making it impossible to migrate the PDN connection of the terminal device from the home 4G network to roaming 5G.
  • this application adds the information used to indicate the registration initiated by the MME in the UDM registration request, so that HSS+UDM does not initiate a location deletion operation to the old MME belonging to the 4G network, and thus makes the core of the roaming 5G network
  • the network can migrate the PDN connection of the terminal device in the home 4G network to the roaming 5G.
  • the HSS+UDM sends the subscription data of the terminal device to the AMF.
  • the requested subscription data includes at least one of the following: DNN or APN, and the SMF+PGW-C FQDN of each PDU connection established by the terminal device in the home 4G.
  • AMF since there is no N26 interface between the home 4G network and the roaming 5G network, AMF cannot obtain the context of the terminal device from the MME, so AMF needs to obtain each PDU established by the terminal device in the home 4G from HSS+UDM The connected SMF+PGW-C FQDN, and then migrate the PDN connection to the roaming 5G network according to the SMF+PGW-C FQDN, maintaining the continuity of the PDU session IP address and business continuity.
  • the AMF selects the PCF, and initiates an AM policy association process.
  • the AMF sends a registration response message to the terminal device.
  • the registration response message is: Registration Accept message.
  • the Registration Accept message in this step can be understood by referring to the aforementioned introduction to the Registration Accept message, and will not be repeated here.
  • the terminal device sends a registration completion message to the AMF.
  • the AMF receives the registration completion message from the terminal device.
  • the registration completion message is: Registration Complete message.
  • the registration complete message is used to indicate that the registration is complete.
  • the terminal device initiates a PDU session establishment request to the AMF.
  • the AMF receives the PDU session establishment request from the terminal device.
  • the request type of the PDU session establishment request is an existing PDU session. That is to say, the Request Type of the PDU session establishment request is Existing PDU Session.
  • the PDU session establishment request includes PDU session ID (PDU Session ID) and S-NSSAI. PDU Session ID and S-NSSAI correspond to existing PDU sessions.
  • the AMF obtains the IP address or FQDN of the SMF+PGW-C ID through NRF and SEEP according to the DNN obtained from the terminal device and the SMF+PGW-C FQDN obtained from the HSS+UDM.
  • the AMF selects the vSMF.
  • the AMF initiates a PDU session establishment process to the vSMF and the SMF+PGW-C.
  • AMF sends Nsmf_PDUSession_CreateSMContext service message to vAMF.
  • the message includes PDU Session ID and FQDN of SMF+PGW-C.
  • vSMF forwards the message to SMF+PGW-C.
  • SMF+PGW-C determines the corresponding PDU session according to the PDU Session ID, and at the same time migrates the user plane of the terminal device from the home 4G network to the roaming 5G network, and establishes the PDU session of the terminal device.
  • the PGW-C+SMF associates the PDU session of the terminal device in the home 4G network with the PDU session established in the roaming 5G network according to the PDU Session ID.
  • SMF+PGW-C instructs the core network of the home 4G network to release the PDN connection and bearer resources of the terminal device.
  • the SMF+PGW-C determines that the PDN connections of the terminal equipment have been migrated, and instructs the core network of the home 4G network to release these migrated PDN connections and bearer resources.
  • 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. 10 it is a schematic structural diagram of an access network device provided by an embodiment of the present application.
  • the access network device includes: a communication unit 1001 and a processing unit 1002 .
  • the processing unit 1002 is configured to instruct the communication unit 1001 to receive a first registration request message from the terminal device; in response to the first registration request message, the processing unit 1002 is further configured to instruct the communication unit 1001 to send a first registration response message to the terminal device;
  • the first registration response message is used to indicate that the core network device supports the first interoperation; the first interoperation is used to ensure service continuity when the terminal device moves between PLMN networks that are not configured with an interoperation interface.
  • the first registration response message includes a first preset field whose value is the first target value; the value is the first The first preset field of the target value is used to indicate that the core network device supports the first interoperation.
  • the first registration response message includes a second preset field whose value is the second target value; the value is the second The second preset field of the target value is used to indicate that the core network device supports the first interoperation.
  • the first registration response message is also used to indicate that the core network device supports the second interoperation; the second interoperation is used to ensure service continuity when the terminal device is switched within the same PLMN network configured with the interoperability interface.
  • the first registration response message further includes a third preset field whose value is a third target value; the third preset field whose value is a third target value is used to indicate that the core network device supports the second interoperability .
  • the processing unit 1002 is further configured to: determine the identifier of the PLMN network to which the terminal device belongs; when the identifier of the PLMN network to which the terminal device belongs is the first preset PLMN network identifier, instruct the communication unit 1001 to send the first preset PLMN network identifier to the terminal device. A registration response message.
  • the first registration response message is used to indicate that the core network device supports the second interoperation.
  • the first registration response message includes a second preset field whose value is the fourth target value; the second preset field whose value is the fourth target value is used to indicate that the core network device supports the second interoperation.
  • the first registration response message includes a third preset field whose value is the third target value; the third preset field whose value is the third target value is used to indicate that the core network device supports the second interoperation.
  • the first registration request message is used to indicate that the terminal device supports the first interoperation.
  • the first registration request message includes a fourth preset field whose value is the fifth target value; the fourth preset field whose value is the fifth target value is used to indicate that the terminal device supports the first interoperation.
  • the first registration request message is also used to indicate that the terminal device supports the second interoperation.
  • the first registration request message further includes a fifth preset field whose value is the sixth target value; the fifth preset field whose value is the sixth target value is used to indicate that the terminal device supports the second interoperation.
  • the core network device is the MME in the home network, or the core network device is the AMF in the roaming network.
  • the first registration request message also includes a sixth preset field whose value is the seventh target value, and a sixth preset field whose value is the seventh target value The field is used to indicate that the terminal device supports the N1 interface of the 5G network; if the core network device is an AMF roaming in the 5G network, the first registration request message also includes a seventh preset field with a value of the eighth target value, which takes The seventh preset field whose value is the eighth target value is used to indicate that the terminal device supports the S1 interface of the 4G network.
  • the first registration request message is an Attach Request message sent by the terminal device to the core network device
  • the first registration response message is an Attach Request message sent by the core network device to the terminal device.
  • Accept message if the core network device is an AMF roaming in the 5G network, the first registration request message is the Registration Request message sent by the terminal device to the core network device, and the first registration response message is the Registration Accept message sent by the core network device to the terminal device information.
  • the core network device is an MME in the home 4G network; the processing unit 1002 is also configured to: instruct the communication unit 1001 to receive an attach request message from the terminal device; where the attach request message is that the terminal device moves from a roaming 5G network to An attach request message generated after the home 4G network; the attach request message includes a PDN connection request message, and the request type of the PDN connection request message is handover; no interoperable interface is configured between the roaming 5G network and the home 4G network; in response to the attach request message , indicating that the communication unit 1001 sends a location update request message to the HSS+UDM; the location update request message is a location update request message indicating that the HSS+UDM does not initiate a deregistration process to the old AMF; the old AMF is the AMF in the second PLMN network; The communication unit 1001 receives a location update response message from HSS+UDM; the location update response message includes the PGWC+SMF FQDN corresponding to the first PDU session
  • the processing unit 1002 is further configured to: instruct the communication unit 1001 to send an initial context establishment request and an attach response message to the access network device; instruct the communication unit 1001 to receive the initial context establishment response message from the access network device, and the An attach complete message for an end device.
  • the attach response message is used to indicate that the core network device supports the first interoperation.
  • the processing unit 1002 is further configured to: instruct the communication unit 1001 to receive a TAU request message from the terminal device; the TAU message includes the first GUTI; the first GUTI is obtained from the GUTI mapping of the terminal device in the roaming 5G network GUTI: determining that the context of the terminal device cannot be acquired according to the first GUTI; instructing the communication unit 1001 to send a TAU rejection message to the terminal device.
  • the core network device is an AMF in a roaming 5G network
  • the processing unit 1002 is also configured to: instruct the communication unit 1001 to receive a second registration request message from the terminal device; the second registration request is that the terminal device moves from the home 4G network A registration request generated after roaming the 5G network; the registration type of the second registration request message is mobility registration update; no interoperability interface is configured between the roaming 5G network and the home 4G network; in response to the registration request message, instruct the communication unit 1001 to HSS+UDM sends a UDM registration request, and the UDM registration request is used to instruct HSS+UDM not to perform a location deletion operation; instruct the communication unit 1001 to receive subscription data from HSS+UDM terminal equipment; the subscription data includes at least one of the following: DNN or APN , and the SMF+PGW-C FQDN connected to the third PDU; according to the DNN or APN and the SMF+PGW-C FQDN connected to the third PDU, initiate the fourth PDU
  • the processing unit 1002 is further configured to: instruct the communication unit 1001 to send a third registration acceptance message to the terminal device; the third registration acceptance message is used to indicate that the core network device supports the first interoperation.
  • the access network device may further include a storage module, configured to store program codes and/or data of the access network device.
  • the processing unit 1002 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 1001 may be a transceiver circuit or a communication interface or the like.
  • the storage module may be a memory.
  • the access network device involved in this embodiment of the present application may be the access network device shown in FIG. 1 .
  • FIG. 11 it is a schematic structural diagram of a terminal device provided in an embodiment of the present application.
  • the terminal device includes: a communication unit 1101 and a processing unit 1102 .
  • the processing unit 1102 is configured to instruct the communication unit 1101 to send a first registration request message to the core network device; the processing unit 1102 is also configured to instruct the communication unit 1101 to receive a first registration response message from the core network device; the first registration response message uses The purpose is to instruct the core network equipment to support the first interoperation; the first interoperation is used to ensure service continuity when the terminal equipment moves between PLMN networks that are not configured with an interoperation interface.
  • the first registration request message is used to indicate that the terminal device supports the first interoperation.
  • the core network device is an MME in the home 4G network
  • the processing unit 1102 is also configured to: generate an attach request message after the terminal device moves from the roaming 5G network to the home 4G network; the attach request message includes a PDN connection request message, the request type of the PDN connection request message is handover; no interoperability interface is configured between the roaming 5G network and the home 4G network; instruct the communication unit 1101 to send an attach request message to the core network device.
  • the processing unit 1102 is further configured to: instruct the communication unit 1101 to receive the RRC connection reconfiguration message and the attach response message from the access network device; the RRC connection reconfiguration message is that the access network device receives the A message generated after the initial context establishment request message; instructs the communication unit 1101 to send an attach complete message to the core network device.
  • the processing unit 1102 is further configured to: instruct the communication unit 1101 to send a TAU request message to the core network device; the TAU message includes the first GUTI; the first GUTI is obtained from the GUTI mapping of the terminal device in the roaming 5G network GUTI: instructs the communication unit 1101 to receive a TAU rejection message from a core network device.
  • the core network device is an AMF in the roaming 5G network
  • the processing unit 1102 is also used to: generate a second registration request after the terminal device moves from the home 4G network to the roaming 5G network; register the second registration request message
  • the type is mobility registration update; no interoperability interface is configured between the roaming 5G network and the home 4G network; and the communication unit 1101 is instructed to send a second registration request to the core network device.
  • the processing unit 1102 is further configured to instruct the communication unit 1101 to receive a third registration acceptance message from the core network device; the third registration acceptance message is used to indicate that the core network device supports the first interoperation.
  • the terminal device may further include a storage module, configured to store program codes and/or data of the terminal device.
  • the processing unit 1102 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 1101 may be a transceiver circuit or a communication interface or the like.
  • the storage module may be a memory. When the processing unit 1102 is a processor, the communication unit 1101 is a communication interface, and the storage module is a memory, the terminal device involved in this embodiment of the present application may be the terminal device shown in FIG. 1 .
  • 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 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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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Databases & Information Systems (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente demande se rapporte au domaine technique des communications. L'invention concerne un procédé et un appareil de communication, un dispositif de réseau central, un dispositif terminal et un support de stockage, qui peuvent assurer la continuité de service du dispositif terminal lorsque celui-ci se déplace entre un réseau domestique et un réseau d'itinérance. Le procédé comprend les étapes suivantes : la réception par un dispositif de réseau central d'un premier message de demande d'enregistrement en provenance d'un dispositif terminal ; et en réponse au premier message de demande d'enregistrement, l'envoi par le dispositif de réseau central d'un premier message de réponse d'enregistrement au dispositif terminal, le premier message de réponse d'enregistrement étant utilisé pour indiquer que le dispositif de réseau central prend en charge une première inter-opération, et la première inter-opération est utilisée pour assurer la continuité de service du dispositif terminal lorsqu'il se déplace entre des réseaux PLMN qui ne sont pas configurés avec des interfaces inter-opération. La présente invention est utilisée dans un scénario d'itinérance d'un dispositif terminal.
PCT/CN2022/134821 2022-01-05 2022-11-28 Procédé et appareil de communication, et dispositif de réseau central, dispositif terminal et support de stockage WO2023130856A1 (fr)

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CN202210010067.8 2022-01-05
CN202210010067.8A CN116456317A (zh) 2022-01-05 2022-01-05 通信方法、装置、核心网设备、终端设备及存储介质

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110944367A (zh) * 2019-12-20 2020-03-31 广东工业大学 一种4g与5g互操作的方法
CN112073368A (zh) * 2020-07-29 2020-12-11 深圳市修远文化创意有限公司 一种网络交互方式切换的方法及其相关装置

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CN110944367A (zh) * 2019-12-20 2020-03-31 广东工业大学 一种4g与5g互操作的方法
CN112073368A (zh) * 2020-07-29 2020-12-11 深圳市修远文化创意有限公司 一种网络交互方式切换的方法及其相关装置

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