WO2023130856A1 - Communication method and apparatus, and core network device, terminal device and storage medium - Google Patents

Communication method and apparatus, and core network device, terminal device and storage medium 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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WO
WIPO (PCT)
Prior art keywords
core network
terminal device
network device
registration
request message
Prior art date
Application number
PCT/CN2022/134821
Other languages
French (fr)
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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Application filed by 中国联合网络通信集团有限公司 filed Critical 中国联合网络通信集团有限公司
Publication of WO2023130856A1 publication Critical patent/WO2023130856A1/en

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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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Abstract

The present application relates to the technical field of communications. Provided are a communication method and apparatus, and a core network device, a terminal device and a storage medium, which can ensure service continuity of the terminal device when same moves between a home network and a roaming network. The method comprises: a core network device receiving a first registration request message from a terminal device; and in response to the first registration request message, the core network device sending a first registration response message to the terminal device, wherein the first registration response message is used for indicating that the core network device supports a first inter-operation, and the first inter-operation is used for ensuring service continuity of the terminal device when same moves between PLMN networks that are not configured with inter-operation interfaces. The present application is used in a roaming scenario of a terminal device.

Description

通信方法、装置、核心网设备、终端设备及存储介质Communication method, device, core network equipment, terminal equipment and storage medium
本申请要求于2022年01月05日提交国家知识产权局、申请号为202210010067.8、申请名称为“通信方法、装置、核心网设备、终端设备及存储介质”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。This application claims the priority of the Chinese patent application with the application number 202210010067.8 and the application name "communication method, device, core network equipment, terminal equipment and storage medium" submitted to the State Intellectual Property Office on January 05, 2022, all of which The contents are incorporated by reference in this application.
技术领域technical field
本发明涉及通信领域，尤其涉及一种通信方法、装置、核心网设备、终端设备及存储介质。The present invention relates to the communication field, in particular to a communication method, device, core network equipment, terminal equipment and storage medium.
背景技术Background technique
在第五代移动通信技术(5th Generation mobile communication technology，5G)核心网漫游场景下，采用归属路由的方式处理漫游终端设备的数据。漫游终端设备在接入漫游网络之后产生的数据由漫游网络传输到归属网络，由归属网络负责处理漫游终端设备的数据。漫游网络和归属网络之间的信令面通过安全边缘保护代理(security edge protection proxies，SEEP)连接，用户面通过漫游网络和归属网络的用户面功能(user plane function，UPF)通过边缘路由器连接。In the fifth generation mobile communication technology (5th Generation mobile communication technology, 5G) core network roaming scenario, 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.
但是当前标准中尚未定义漫游网络和归属网络之间的互操作接口(N26接口)，导致终端设备在归属网络的***移动通信技术(4th Generation mobile communication technology，4G)网络和漫游网络的5G网络之间切换时需要中断终端设备原有的协议数据单元(Protocol Data Unit，PDU)会话，在终端设备移动到新的网络之后再新的网络上建立PDU会话，这将导致终端设备的业务在移动过程中终端，业务连续性无法保证。However, 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. When switching between networks, it is necessary to interrupt the original protocol data unit (Protocol Data Unit, PDU) session of the terminal device, and establish a PDU session on the new network after the terminal device moves to the new network, which will cause the service of the terminal device to be disconnected. During the mobile process, the service continuity cannot be guaranteed.
发明内容Contents of the invention
本申请提供一种通信方法、装置、核心网设备、终端设备及存储介质，能够保证终端设备在归属网络和漫游网络之间移动时的业务连续性。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.
第一方面，提供一种通信方法，包括：核心网设备接收来自终端设备的第一注册请求消息；响应于第一注册请求消息，核心网设备向终端设备发送第一注册响应消息；第一注册响应消息用于指示核心网设备支持第一互操作；第一互操作用于保证终端设备在未配置互操作接口的PLMN网络之间移动时的业务连续性。In a first aspect, a communication method is provided, 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.
结合上述第一方面，在一种可能的实现方式中，在所述核心网设备和所述终端设备归属于同一运营商的情况下，第一注册响应消息中包括取值为第一目标值的第一预设字段；取值为第一目标值的第一预设字段用于指示核心网设备支持第一互操作。With reference to the first aspect above, in a possible implementation manner, 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.
结合上述第一方面，在一种可能的实现方式中，在所述核心网设备和所述终端设备归属于不同运营商的情况下，第一注册响应消息中包括取值为第二目标值的第二预设字段；取值为第二目标值的第二预设字段用于指示核心网设备支持第一互操作。With reference to the first aspect above, in a possible implementation, when the core network device and the terminal device belong to different operators, 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.
结合上述第一方面，在一种可能的实现方式中，第一注册响应消息，还用于指示 核心网设备支持第二互操作；第二互操作用于保证终端设备在配置有互操作接口的同一PLMN网络内切换时的业务连续性。In combination with the first aspect above, in a possible implementation manner, 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.
结合上述第一方面，在一种可能的实现方式中，第一注册响应消息中还包括取值为第三目标值的第三预设字段；取值为第三目标值的第三预设字段用于指示核心网设备支持第二互操作。With reference to the first aspect above, in a possible implementation manner, 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.
结合上述第一方面，在一种可能的实现方式中，核心网设备为漫游运营商的AMF，在核心网设备向终端设备发送第一注册响应消息之前，方法还包括：核心网设备确定终端设备所属的PLMN网络的标识；在终端设备所属的PLMN网络的标识为第一预设PLMN网络标识时，核心网设备向终端设备发送第一注册响应消息。In combination with the first aspect above, in a possible implementation manner, the core network device is an AMF of a roaming operator, and before the core network device sends the first registration response message to the terminal device, 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.
结合上述第一方面，在一种可能的实现方式中，在所述终端设备所属的PLMN网络的标识为第二预设PLMN网络标识时，所述第一注册响应消息用于指示所述核心网设备支持第二互操作。With reference to the first aspect above, in a possible implementation manner, when the identity of the PLMN network to which the terminal device belongs is the second preset PLMN network identity, the first registration response message is used to indicate that the core network The device supports the second interoperability.
结合上述第一方面，在一种可能的实现方式中，第一注册响应消息中包括取值为第四目标值的第二预设字段；取值为第四目标值的第二预设字段用于指示核心网设备支持第二互操作。With reference to the first aspect above, in a possible implementation manner, 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.
结合上述第一方面，在一种可能的实现方式中，第一注册响应消息中包括取值为第三目标值的第三预设字段；取值为第三目标值的第三预设字段用于指示核心网设备支持第二互操作。With reference to the first aspect above, in a possible implementation manner, 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.
结合上述第一方面，在一种可能的实现方式中，第一注册请求消息用于指示终端设备支持第一互操作。With reference to the foregoing first aspect, in a possible implementation manner, the first registration request message is used to indicate that the terminal device supports the first interoperation.
结合上述第一方面，在一种可能的实现方式中，第一注册请求消息中包括取值为第五目标值的第四预设字段；取值为第五目标值的第四预设字段用于指示终端设备支持第一互操作。With reference to the first aspect above, in a possible implementation manner, 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.
结合上述第一方面，在一种可能的实现方式中，第一注册请求消息还用于指示终端设备支持第二互操作。With reference to the foregoing first aspect, in a possible implementation manner, the first registration request message is further used to indicate that the terminal device supports the second interoperation.
结合上述第一方面，在一种可能的实现方式中，第一注册请求消息中还包括取值为第六目标值的第五预设字段；取值为第六目标值的第五预设字段用于指示终端设备支持第二互操作。With reference to the first aspect above, in a possible implementation manner, 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.
结合上述第一方面，在一种可能的实现方式中，核心网设备为归属网络中的MME，或者核心网设备为漫游网络中的AMF。With reference to the first aspect above, in a possible implementation manner, the core network device is the MME in the home network, or the core network device is the AMF in the roaming network.
结合上述第一方面，在一种可能的实现方式中，若核心网设备为归属4G网络中的MME，则第一注册请求消息中还包括取值为第七目标值的第六预设字段，取值为第七目标值的第六预设字段用于指示终端设备支持5G网络的N1接口；若核心网设备为漫游5G网络中的AMF，则第一注册请求消息中还包括取值为第八目标值的第七预设字段，取值为第八目标值的第七预设字段用于指示终端设备支持4G网络的S1接口。In combination with the first aspect above, in a possible implementation, if the core network device is an MME in the home 4G 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.
结合上述第一方面，在一种可能的实现方式中，若核心网设备为归属4G网络中的MME，则第一注册请求消息为终端设备向核心网设备发送的Attach Request消息，第一注册响应消息为核心网设备向终端设备发送的Attach Accept消息；若核心网设备为漫游5G网络中的AMF，则第一注册请求消息为终端设备向核心网设备发送的 Registration Request消息，第一注册响应消息为核心网设备向终端设备发送的Registration Accept消息。In combination with the first aspect above, in a possible implementation, if the core network device is an MME in the home 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.
结合上述第一方面，在一种可能的实现方式中，在核心网设备为归属4G网络中的MME的情况下，核心网设备支持第一互操作通过以下步骤实现：核心网设备接收来自终端设备的附着请求消息；其中，附着请求消息为终端设备从漫游5G网络移动到归属4G网络之后生成的附着请求消息；附着请求消息中包括PDN连接请求消息，PDN连接请求消息的请求类型为切换；漫游5G网络和归属4G网络之间未配置互操作接口；响应于附着请求消息，核心网设备向HSS+UDM发送位置更新请求消息；位置更新请求消息为指示HSS+UDM不向old AMF发起取消登记流程的位置更新请求消息；old AMF为第二PLMN网络中的AMF；核心网设备接收来自HSS+UDM的位置更新响应消息；位置更新响应消息中包括与第一PDU会话对应的PGWC+SMF FQDN；核心网设备根据PGWC+SMF FQDN发起PDU创建会话流程；该PDU会话创建流程用于在第一PLMN网络中建立第二PDU会话，并关联第一PDU会话和第二PDU会话。In combination with the above-mentioned first aspect, in a possible implementation manner, when the core network device is an MME in the home 4G network, 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+SMF FQDN corresponding to the first PDU session; the core The network device initiates a PDU session creation process according to 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.
结合上述第一方面，在一种可能的实现方式中，在核心网设备根据PGWC+SMF FQDN发起PDU创建会话流程之后，方法还包括：核心网设备向接入网设备发送初始上下文建立请求和附着响应消息；核心网设备接收来自接入网设备的初始上下文建立响应消息，以及来自终端设备的附着完成消息。In combination with the first aspect above, in a possible implementation, after the core network device initiates the PDU creation session process according to the PGWC+SMF FQDN, 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.
结合上述第一方面，在一种可能的实现方式中，附着响应消息用于指示核心网设备支持第一互操作。With reference to the foregoing first aspect, in a possible implementation manner, the attach response message is used to indicate that the core network device supports the first interoperation.
结合上述第一方面，在一种可能的实现方式中，在核心网设备接收来自终端设备的附着请求消息之前，方法还包括：核心网设备接收来自终端设备的TAU请求消息；TAU消息中包括第一GUTI；第一GUTI为从终端设备在漫游5G网络中的GUTI映射得到的GUTI；核心网设备根据第一GUTI确定无法获取终端设备的上下文；核心网设备向终端设备发送TAU拒绝消息。With reference to the above first aspect, in a possible implementation manner, before the core network device receives the attach request message from the terminal device, 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.
结合上述第一方面，在一种可能的实现方式中，在核心网设备为漫游5G网络中的AMF的情况下，核心网设备支持第一互操作通过以下步骤实现：核心网设备接收来自终端设备的第二注册请求消息；第二注册请求为终端设备从归属4G网络移动到漫游5G网络之后生成的注册请求；第二注册请求消息的注册类型为移动性注册更新；漫游5G网络和归属4G网络之间未配置互操作接口；响应于注册请求消息，核心网设备向HSS+UDM发送UDM注册请求，UDM注册请求用于指示HSS+UDM不进行位置删除操作；核心网设备接收来自HSS+UDM的终端设备的签约数据；签约数据包括以下至少一项：DNN或APN，以及第三PDU连接的SMF+PGW-C FQDN；核心网设备根据DNN或APN和第三PDU连接的SMF+PGW-C FQDN，发起第四PDU会话建立流程；第四PDU会话建立流程用于在第二PLMN网络中建立第四PDU会话，并关联第三PDU会话和第四PDU会话。In combination with the first aspect above, in a possible implementation, when the core network device is an AMF in a roaming 5G network, the core network device 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 of the core network device connected to the third PDU according to the DNN or APN , initiate a fourth PDU session establishment procedure; the fourth PDU session establishment procedure is used to establish a fourth PDU session in the second PLMN network, and associate the third PDU session with the fourth PDU session.
结合上述第一方面，在一种可能的实现方式中，在核心网设备接收来自HSS+UDM的终端设备的签约数据之后，方法还包括：核心网设备向终端设备发送第三注册接受消息；第三注册接受消息用于表示核心网设备支持第一互操作。In combination with the first aspect above, in a possible implementation, after the core network device receives the subscription data from the HSS+UDM terminal device, 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.
第二方面，提供一种通信方法，包括：终端设备向核心网设备发送第一注册请求消息；终端设备接收来自核心网设备的第一注册响应消息；第一注册响应消息用于指示核心网设备支持第一互操作；第一互操作用于保证终端设备在未配置互操作接口的PLMN网络之间移动时的业务连续性。In a second aspect, a communication method is provided, 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.
结合上述第二方面，在一种可能的实现方式中，在所述核心网设备和所述终端设备归属于同一运营商的情况下，第一注册响应消息中包括取值为第一目标值的第一预设字段；取值为第一目标值的第一预设字段用于指示核心网设备支持第一互操作。With reference to the second aspect above, in a possible implementation, 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.
结合上述第二方面，在一种可能的实现方式中，在所述核心网设备和所述终端设备归属于不同运营商的情况下，第一注册响应消息中包括取值为第二目标值的第二预设字段；取值为第二目标值的第二预设字段用于指示核心网设备支持第一互操作。With reference to the second aspect above, in a possible implementation, when the core network device and the terminal device belong to different operators, 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.
结合上述第二方面，在一种可能的实现方式中，第一注册响应消息，还用于指示核心网设备支持第二互操作；第二互操作用于保证终端设备在配置有互操作接口的同一PLMN网络内切换时的业务连续性。With reference to the second aspect above, in a possible implementation manner, 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.
结合上述第二方面，在一种可能的实现方式中，第一注册响应消息中还包括取值为第三目标值的第三预设字段；取值为第三目标值的第三预设字段用于指示核心网设备支持第二互操作。With reference to the second aspect above, in a possible implementation manner, 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.
结合上述第二方面，在一种可能的实现方式中，核心网设备为漫游运营商的AMF，在核心网设备向终端设备发送第一注册响应消息之前，方法还包括：核心网设备确定终端设备所属的PLMN网络的标识；在终端设备所属的PLMN网络的标识为第一预设PLMN网络标识时，核心网设备向终端设备发送第一注册响应消息。In combination with the second aspect above, in a possible implementation manner, the core network device is an AMF of a roaming operator, and before the core network device sends the first registration response message to the terminal device, 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.
结合上述第二方面，在一种可能的实现方式中，在所述终端设备所属的PLMN网络的标识为第二预设PLMN网络标识时，所述第一注册响应消息用于指示所述核心网设备支持第二互操作。With reference to the second aspect above, in a possible implementation manner, when the identifier of the PLMN network to which the terminal device belongs is the second preset PLMN network identifier, the first registration response message is used to indicate that the core network The device supports the second interoperability.
结合上述第二方面，在一种可能的实现方式中，第一注册响应消息中包括取值为第四目标值的第二预设字段；取值为第四目标值的第二预设字段用于指示核心网设备支持第二互操作。With reference to the second aspect above, in a possible implementation manner, 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.
结合上述第二方面，在一种可能的实现方式中，第一注册响应消息中包括取值为第三目标值的第三预设字段；取值为第三目标值的第三预设字段用于指示核心网设备支持第二互操作。With reference to the second aspect above, in a possible implementation manner, 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.
结合上述第二方面，在一种可能的实现方式中，第一注册请求消息用于指示终端设备支持第一互操作。With reference to the second aspect above, in a possible implementation manner, the first registration request message is used to indicate that the terminal device supports the first interoperation.
结合上述第二方面，在一种可能的实现方式中，第一注册请求消息中包括取值为第五目标值的第四预设字段；取值为第五目标值的第四预设字段用于指示终端设备支持第一互操作。In combination with the second aspect above, in a possible implementation manner, 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.
结合上述第二方面，在一种可能的实现方式中，第一注册请求消息还用于指示终端设备支持第二互操作。With reference to the second aspect above, in a possible implementation manner, the first registration request message is further used to indicate that the terminal device supports the second interoperation.
结合上述第二方面，在一种可能的实现方式中，第一注册请求消息中还包括取值为第六目标值的第五预设字段；取值为第六目标值的第五预设字段用于指示终端设备支持第二互操作。With reference to the second aspect above, in a possible implementation manner, 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.
结合上述第二方面，在一种可能的实现方式中，核心网设备为归属网络中的MME，或者核心网设备为漫游网络中的AMF。With reference to the second aspect above, in a possible implementation manner, the core network device is the MME in the home network, or the core network device is the AMF in the roaming network.
结合上述第二方面，在一种可能的实现方式中，在核心网设备为归属4G网络中的MME的情况下，终端设备支持第一互操作通过以下步骤实现：在终端设备从漫游5G网络移动到归属4G网络之后，终端设备生成附着请求消息；附着请求消息中包括PDN连接请求消息，PDN连接请求消息的请求类型为切换；漫游5G网络和归属4G网络之间未配置互操作接口；终端设备向核心网设备发送附着请求消息。In combination with the second aspect above, in a possible implementation, 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.
结合上述第二方面，在一种可能的实现方式中，在终端设备向核心网设备发送附着请求消息之后，方法还包括：终端设备接收来自接入网设备的RRC连接重配置消息和附着响应消息；RRC连接重配置消息为接入网设备接收到来自核心网设备的初始上下文建立请求消息后生成的消息；终端设备向核心网设备发送附着完成消息。With reference to the second aspect above, in a possible implementation, after the terminal device sends the 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.
结合上述第二方面，在一种可能的实现方式中，在终端设备向核心网设备发送附着请求消息之前，方法还包括：终端设备向核心网设备发送TAU请求消息；TAU消息中包括第一GUTI；第一GUTI为从终端设备在漫游5G网络中的GUTI映射得到的GUTI；终端设备接收来自核心网设备的TAU拒绝消息。With reference to the second aspect above, in a possible implementation manner, before the terminal device sends an attach request 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.
结合上述第二方面，在一种可能的实现方式中，在核心网设备为漫游5G网络中的AMF的情况下，终端设备支持第一互操作通过以下步骤实现：在终端设备从归属4G网络移动到漫游5G网络之后，终端设备生成第二注册请求；第二注册请求消息的注册类型为移动性注册更新；漫游5G网络和归属4G网络之间未配置互操作接口；终端设备向核心网设备发送第二注册请求。In combination with the second aspect above, in a possible implementation, 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.
结合上述第二方面，在一种可能的实现方式中，方法还包括：终端设备接收来自核心网设备的第三注册接受消息；第三注册接受消息用于表示核心网设备支持第一互操作。With reference to the second aspect above, in a possible implementation manner, 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.
第三方面，提供一种核心网设备，包括：处理单元和通信单元；处理单元，用于指示通信单元接收来自终端设备的第一注册请求消息；响应于第一注册请求消息，处理单元，还用于指示通信单元向终端设备发送第一注册响应消息；第一注册响应消息用于指示核心网设备支持第一互操作；第一互操作用于保证终端设备在未配置互操作接口的PLMN网络之间移动时的业务连续性。In a third aspect, a core network device is provided, 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.
结合上述第三方面，在一种可能的实现方式中，在所述核心网设备和所述终端设备归属于同一运营商的情况下，第一注册响应消息中包括取值为第一目标值的第一预设字段；取值为第一目标值的第一预设字段用于指示核心网设备支持第一互操作。With reference to the third aspect above, in a possible implementation manner, 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.
结合上述第三方面，在一种可能的实现方式中，在所述核心网设备和所述终端设备归属于不同运营商的情况下，第一注册响应消息中包括取值为第二目标值的第二预设字段；取值为第二目标值的第二预设字段用于指示核心网设备支持第一互操作。With reference to the third aspect above, in a possible implementation, when the core network device and the terminal device belong to different operators, 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.
结合上述第三方面，在一种可能的实现方式中，第一注册响应消息，还用于指示核心网设备支持第二互操作；第二互操作用于保证终端设备在配置有互操作接口的同一PLMN网络内切换时的业务连续性。In combination with the third aspect above, in a possible implementation manner, 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.
结合上述第三方面，在一种可能的实现方式中，第一注册响应消息中还包括取值为第三目标值的第三预设字段；取值为第三目标值的第三预设字段用于指示核心网设 备支持第二互操作。With reference to the third aspect above, in a possible implementation manner, 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.
结合上述第三方面，在一种可能的实现方式中，处理单元，还用于：确定终端设备所属的PLMN网络的标识；在终端设备所属的PLMN网络的标识为第一预设PLMN网络标识时，指示通信单元向终端设备发送第一注册响应消息。In combination with the third aspect above, in a possible implementation manner, 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.
结合上述第三方面，在一种可能的实现方式中，在所述终端设备所属的PLMN网络的标识为第二预设PLMN网络标识时，所述第一注册响应消息用于指示所述核心网设备支持第二互操作。With reference to the third aspect above, in a possible implementation manner, when the identity of the PLMN network to which the terminal device belongs is the second preset PLMN network identity, the first registration response message is used to indicate that the core network The device supports the second interoperability.
结合上述第三方面，在一种可能的实现方式中，第一注册响应消息中包括取值为第四目标值的第二预设字段；取值为第四目标值的第二预设字段用于指示核心网设备支持第二互操作。With reference to the third aspect above, in a possible implementation manner, 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.
结合上述第三方面，在一种可能的实现方式中，第一注册响应消息中包括取值为第三目标值的第三预设字段；取值为第三目标值的第三预设字段用于指示核心网设备支持第二互操作。In combination with the third aspect above, in a possible implementation manner, 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.
结合上述第三方面，在一种可能的实现方式中，第一注册请求消息用于指示终端设备支持第一互操作。With reference to the third aspect above, in a possible implementation manner, the first registration request message is used to indicate that the terminal device supports the first interoperation.
结合上述第三方面，在一种可能的实现方式中，第一注册请求消息中包括取值为第五目标值的第四预设字段；取值为第五目标值的第四预设字段用于指示终端设备支持第一互操作。In combination with the third aspect above, in a possible implementation manner, 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.
结合上述第三方面，在一种可能的实现方式中，第一注册请求消息还用于指示终端设备支持第二互操作。With reference to the third aspect above, in a possible implementation manner, the first registration request message is further used to indicate that the terminal device supports the second interoperation.
结合上述第三方面，在一种可能的实现方式中，第一注册请求消息中还包括取值为第六目标值的第五预设字段；取值为第六目标值的第五预设字段用于指示终端设备支持第二互操作。With reference to the third aspect above, in a possible implementation manner, 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.
结合上述第三方面，在一种可能的实现方式中，核心网设备为归属网络中的MME，或者核心网设备为漫游网络中的AMF。With reference to the above third aspect, in a possible implementation manner, the core network device is the MME in the home network, or the core network device is the AMF in the roaming network.
结合上述第三方面，在一种可能的实现方式中，若核心网设备为归属4G网络中的MME，则第一注册请求消息中还包括取值为第七目标值的第六预设字段，取值为第七目标值的第六预设字段用于指示终端设备支持5G网络的N1接口；若核心网设备为漫游5G网络中的AMF，则第一注册请求消息中还包括取值为第八目标值的第七预设字段，取值为第八目标值的第七预设字段用于指示终端设备支持4G网络的S1接口。In combination with the third aspect above, in a possible implementation, if the core network device is an MME in the home 4G 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.
结合上述第三方面，在一种可能的实现方式中，若核心网设备为归属4G网络中的MME，则第一注册请求消息为终端设备向核心网设备发送的Attach Request消息，第一注册响应消息为核心网设备向终端设备发送的Attach Accept消息；若核心网设备为漫游5G网络中的AMF，则第一注册请求消息为终端设备向核心网设备发送的Registration Request消息，第一注册响应消息为核心网设备向终端设备发送的Registration Accept消息。In combination with the third aspect above, in a possible implementation, if the core network device is an MME in the home 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.
结合上述第三方面，在一种可能的实现方式中，核心网设备为归属4G网络中的MME；处理单元，还用于：指示通信单元接收来自终端设备的附着请求消息；其中，附着请求消息为终端设备从漫游5G网络移动到归属4G网络之后生成的附着请求消息； 附着请求消息中包括PDN连接请求消息，PDN连接请求消息的请求类型为切换；漫游5G网络和归属4G网络之间未配置互操作接口；响应于附着请求消息，指示通信单元向HSS+UDM发送位置更新请求消息；位置更新请求消息为指示HSS+UDM不向old AMF发起取消登记流程的位置更新请求消息；old AMF为第二PLMN网络中的AMF；指示通信单元接收来自HSS+UDM的位置更新响应消息；位置更新响应消息中包括与第一PDU会话对应的PGWC+SMF FQDN；根据PGWC+SMF FQDN发起PDU创建会话流程；该PDU会话创建流程用于在第一PLMN网络中建立第二PDU会话，并关联第一PDU会话和第二PDU会话。In combination with the third aspect above, in a possible implementation manner, 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 to the first PDU session; initiate the PDU session creation 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.
结合上述第三方面，在一种可能的实现方式中，处理单元，还用于：指示通信单元向接入网设备发送初始上下文建立请求和附着响应消息；指示通信单元接收来自接入网设备的初始上下文建立响应消息，以及来自终端设备的附着完成消息。With reference to the third aspect above, in a possible implementation manner, 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.
结合上述第三方面，在一种可能的实现方式中，附着响应消息用于指示核心网设备支持第一互操作。With reference to the third aspect above, in a possible implementation manner, the attach response message is used to indicate that the core network device supports the first interoperation.
结合上述第三方面，在一种可能的实现方式中，处理单元，还用于：指示通信单元接收来自终端设备的TAU请求消息；TAU消息中包括第一GUTI；第一GUTI为从终端设备在漫游5G网络中的GUTI映射得到的GUTI；根据第一GUTI确定无法获取终端设备的上下文；指示通信单元向终端设备发送TAU拒绝消息。In combination with the third aspect above, in a possible implementation manner, 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.
结合上述第三方面，在一种可能的实现方式中，核心网设备为漫游5G网络中的AMF，处理单元，还用于：指示通信单元接收来自终端设备的第二注册请求消息；第二注册请求为终端设备从归属4G网络移动到漫游5G网络之后生成的注册请求；第二注册请求消息的注册类型为移动性注册更新；漫游5G网络和归属4G网络之间未配置互操作接口；响应于注册请求消息，指示通信单元向HSS+UDM发送UDM注册请求，UDM注册请求用于指示HSS+UDM不进行位置删除操作；指示通信单元接收来自HSS+UDM的终端设备的签约数据；签约数据包括以下至少一项：DNN或APN，以及第三PDU连接的SMF+PGW-C FQDN；根据DNN或APN和第三PDU连接的SMF+PGW-C FQDN，发起第四PDU会话建立流程；第四PDU会话建立流程用于在第二PLMN网络中建立第四PDU会话，并关联第三PDU会话和第四PDU会话。In combination with the above third aspect, in a possible implementation manner, the core network device is an AMF in a roaming 5G network, and 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, initiate the fourth PDU session establishment process; the fourth PDU session The establishment process is used to establish the fourth PDU session in the second PLMN network, and associate the third PDU session with the fourth PDU session.
结合上述第三方面，在一种可能的实现方式中，处理单元，还用于：指示通信单元向终端设备发送第三注册接受消息；第三注册接受消息用于表示核心网设备支持第一互操作。With reference to the third aspect above, in a possible implementation manner, 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.
第四方面，提供一种终端设备，包括：处理单元和通信单元；处理单元，用于指示通信单元向核心网设备发送第一注册请求消息；处理单元，还用于指示通信单元接收来自核心网设备的第一注册响应消息；第一注册响应消息用于指示核心网设备支持第一互操作；第一互操作用于保证终端设备在未配置互操作接口的PLMN网络之间移动时的业务连续性。In a fourth aspect, a terminal device is provided, 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.
结合上述第四方面，在一种可能的实现方式中，第一注册请求消息用于表示终端设备支持第一互操作。With reference to the fourth aspect above, in a possible implementation manner, the first registration request message is used to indicate that the terminal device supports the first interoperation.
结合上述第四方面，在一种可能的实现方式中，核心网设备为归属4G网络中的MME，处理单元，还用于：在终端设备从漫游5G网络移动到归属4G网络之后，生 成附着请求消息；附着请求消息中包括PDN连接请求消息，PDN连接请求消息的请求类型为切换；漫游5G网络和归属4G网络之间未配置互操作接口；指示通信单元向核心网设备发送附着请求消息。In combination with the fourth aspect above, in a possible implementation manner, the core network device is an MME in the home 4G network, and 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.
结合上述第四方面，在一种可能的实现方式中，处理单元，还用于：指示通信单元接收来自接入网设备的RRC连接重配置消息和附着响应消息；RRC连接重配置消息为接入网设备接收到来自核心网设备的初始上下文建立请求消息后生成的消息；指示通信单元向核心网设备发送附着完成消息。With reference to the above fourth aspect, in a possible implementation manner, 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.
结合上述第四方面，在一种可能的实现方式中，处理单元，还用于：指示通信单元向核心网设备发送TAU请求消息；TAU消息中包括第一GUTI；第一GUTI为从终端设备在漫游5G网络中的GUTI映射得到的GUTI；指示通信单元接收来自核心网设备的TAU拒绝消息。In combination with the fourth aspect above, in a possible implementation manner, 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.
结合上述第四方面，在一种可能的实现方式中，核心网设备为漫游5G网络中的AMF，处理单元，还用于：在终端设备从归属4G网络移动到漫游5G网络之后，生成第二注册请求；第二注册请求消息的注册类型为移动性注册更新；述漫游5G网络和归属4G网络之间未配置互操作接口；指示通信单元向核心网设备发送第二注册请求。In combination with the fourth aspect above, in a possible implementation manner, the core network device is an AMF in a roaming 5G network, and 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.
结合上述第四方面，在一种可能的实现方式中，处理单元，还用于指示通信单元接收来自核心网设备的第三注册接受消息；第三注册接受消息用于表示核心网设备支持第一互操作。With reference to the fourth aspect above, in a possible implementation manner, 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.
第五方面，本申请提供了一种通信装置，该通信装置包括：处理器和通信接口；通信接口和处理器耦合，处理器用于运行计算机程序或指令，以实现如第一方面和第一方面的任一种可能的实现方式中所描述的通信方法。In a fifth aspect, 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 .
第六方面，本申请提供了一种通信装置，该通信装置包括：处理器和通信接口；通信接口和处理器耦合，处理器用于运行计算机程序或指令，以实现如第二方面和第二方面的任一种可能的实现方式中所描述的通信方法。In a sixth aspect, 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 .
第七方面，本申请提供了一种计算机可读存储介质，计算机可读存储介质中存储有指令，当计算机可读存储介质中的指令由通信装置的处理器执行时，使得通信装置能够执行如第一方面和第一方面的任一种可能的实现方式中描述的通信方法。In a seventh aspect, the present application provides a computer-readable storage medium, where instructions are stored in the computer-readable storage medium, and when the instructions in the computer-readable storage medium are executed by the processor of the communication device, the communication device can perform such The first aspect and the communication method described in any possible implementation manner of the first aspect.
第八方面，本申请提供了一种计算机可读存储介质，计算机可读存储介质中存储有指令，当计算机可读存储介质中的指令由通信装置的处理器执行时，使得通信装置能够执行如第二方面和第二方面的任一种可能的实现方式中描述的通信方法。In an eighth 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.
上述第二方面至第八方面中任一种实现方式所带来的技术效果可以参见第一方面对应设计所带来的技术效果，此处不再赘述。For the technical effects brought about by any one of the above-mentioned second to eighth aspects, please refer to the technical effects brought about by the corresponding design in the first aspect, which will not be repeated here.
在本申请中，上述通信装置、核心网设备和终端设备的名字对设备或功能模块本身不构成限定，在实际实现中，这些设备或功能模块可以以其他名称出现。只要各个设备或功能模块的功能和本发明类似，属于本发明权利要求及其等同技术的范围之内。In this application, the names of the above-mentioned communication devices, core network devices, and terminal devices do not limit the devices or functional modules themselves. In actual implementation, these devices or functional modules may appear with other names. As long as the functions of each device or functional module are similar to those of the present invention, they fall within the scope of the claims of the present invention and their equivalent technologies.
本发明的这些方面或其他方面在以下的描述中会更加简明易懂。These and other aspects of the invention will be more clearly understood in the following description.
本申请提供的技术方案至少带来以下有益效果：The technical solution provided by the application brings at least the following beneficial effects:
在终端设备向核心网设备进行注册的过程中，核心网设备指示终端设备支持能够保证终端设备在未配置互操作接口的PLMN网络之间移动时的业务连续性的第一互操 作。这样，终端设备在从该网络移动到其他网络时，核心网设备可以通过与其他网络中的核心网设备交互进行第一互操作，将终端设备的业务迁移到其他网络中，从而保证终端设备的业务连续性。During the process of the terminal device registering with the core network device, 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. 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.
附图说明Description of drawings
图1为本申请实施例提供的一种通信装置的结构示意图；FIG. 1 is a schematic structural diagram of a communication device provided in an embodiment of the present application;
图2为本申请实施例提供的一种在5G核心网漫游中终端设备的移动性示意图；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;
图3为本申请实施例提供的一种5G核心网漫游场景下归属网络和漫游网络的连接示意图；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;
图4为本申请实施例提供的一种通信方法的流程示意图；FIG. 4 is a schematic flowchart of a communication method provided by an embodiment of the present application;
图5为本申请实施例提供的另一种通信方法的流程示意图；FIG. 5 is a schematic flowchart of another communication method provided by the embodiment of the present application;
图6为本申请实施例提供的另一种通信方法的流程示意图；FIG. 6 is a schematic flowchart of another communication method provided by the embodiment of the present application;
图7为本申请实施例提供的另一种通信方法的流程示意图；FIG. 7 is a schematic flowchart of another communication method provided by the embodiment of the present application;
图8为本申请实施例提供的另一种通信方法的流程示意图；FIG. 8 is a schematic flowchart of another communication method provided by the embodiment of the present application;
图9为本申请实施例提供的另一种通信方法的流程示意图；FIG. 9 is a schematic flowchart of another communication method provided by the embodiment of the present application;
图10为本申请实施例提供的一种接入网设备的结构示意图；FIG. 10 is a schematic structural diagram of an access network device provided in an embodiment of the present application;
图11为本申请实施例提供的终端设备的结构示意图。FIG. 11 is a schematic structural diagram of a terminal device provided by an embodiment of the present application.
具体实施方式Detailed ways
本文中术语“和/或”，仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。The term "and/or" in this article is just an association relationship describing associated objects, which means that there can be three relationships, for example, A and/or B can mean: A exists alone, A and B exist simultaneously, and there exists alone B these three situations.
本申请的说明书以及附图中的术语“第一”和“第二”等是用于区别不同的对象，或者用于区别对同一对象的不同处理，而不是用于描述对象的特定顺序。The terms "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.
此外，本申请的描述中所提到的术语“包括”和“具有”以及它们的任何变形，意图在于覆盖不排他的包含。例如包含了一系列步骤或单元的过程、方法、***、产品或设备没有限定于已列出的步骤或单元，而是可选的还包括其他没有列出的步骤或单元，或可选的还包括对于这些过程、方法、产品或设备固有的其它步骤或单元。In addition, the terms "including" and "having" mentioned in the description of the present application and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but may optionally include other unlisted steps or units, or may optionally also include Other steps or elements inherent to the process, method, product or apparatus are included.
需要说明的是，本申请实施例中，“示例性的”或者“例如”等词用于表示作例子、例证或说明。本申请实施例中被描述为“示例性的”或者“例如”的任何实施例或设计方案不应被解释为比其它实施例或设计方案更优选或更具优势。确切而言，使用“示例性的”或者“例如”等词旨在以具体方式呈现相关概念。It should be noted that, in the embodiments of the present application, words such as "exemplary" or "for example" are used as examples, illustrations or descriptions. Any embodiment or design scheme described as "exemplary" or "for example" in the embodiments of the present application shall not be interpreted as being more preferred or more advantageous than other embodiments or design schemes. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete manner.
在本申请的描述中，除非另有说明，“多个”的含义是指两个或两个以上。In the description of the present application, unless otherwise specified, the meaning of "plurality" refers to two or more.
为了实现本申请实施例提供的通信方法，本申请实施例提供了一种通信装置，用于执行的通信方法，图1为本申请实施例提供的一种通信装置的结构示意图。如图1所示，该通信装置100包括至少一个处理器101，通信线路102，以及至少一个通信接口104，还可以包括存储器103。其中，处理器101，存储器103以及通信接口104三者之间可以通过通信线路102连接。In order to implement the communication method provided in the embodiment of the present application, the embodiment of the present application provides a communication device for performing the communication method. FIG. 1 is a schematic structural diagram of a communication device provided in the embodiment of the present application. As shown in FIG. 1 , 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 . Wherein, the processor 101 , the memory 103 and the communication interface 104 may be connected through a communication line 102 .
处理器101可以是一个中央处理器(central processing unit，CPU)，也可以是特定集成电路(application specific integrated circuit，ASIC)，或者是被配置成实施本申 请实施例的一个或多个集成电路，例如：一个或多个数字信号处理器(digital signal processor，DSP)，或，一个或者多个现场可编程门阵列(field programmable gate array，FPGA)。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).
通信线路102可以包括一通路，用于在上述组件之间传送信息。Communication line 102 may include a path for communicating information between the above-described components.
通信接口104，用于与其他设备或通信网络通信，可以使用任何收发器一类的装置，如以太网，无线接入网(radio access network，RAN)，无线局域网(wireless local area networks，WLAN)等。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.
存储器103可以是只读存储器(read-only memory，ROM)或可存储静态信息和指令的其他类型的静态存储设备，随机存取存储器(random access memory，RAM)或者可存储信息和指令的其他类型的动态存储设备，也可以是电可擦可编程只读存储器(electrically erasable programmable read-only memory，EEPROM)、只读光盘(compact disc read-only memory，CD-ROM)或其他光盘存储、光碟存储(包括压缩光碟、激光碟、光碟、数字通用光碟、蓝光光碟等)、磁盘存储介质或者其他磁存储设备、或者能够用于包括或存储具有指令或数据结构形式的期望的程序代码并能够由计算机存取的任何其他介质，但不限于此。 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.
一种可能的设计中，存储器103可以独立于处理器101存在，即存储器103可以为处理器101外部的存储器，此时，存储器103可以通过通信线路102与处理器101相连接，用于存储执行指令或者应用程序代码，并由处理器101来控制执行，实现本申请下述实施例提供的通信方法。又一种可能的设计中，存储器103也可以和处理器101集成在一起，即存储器103可以为处理器101的内部存储器，例如，该存储器103为高速缓存，可以用于暂存一些数据和指令信息等。In a possible design, 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. In yet another possible design, 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.
作为一种可实现方式，处理器101可以包括一个或多个CPU，例如图1中的CPU0和CPU1。作为另一种可实现方式，通信装置100可以包括多个处理器，例如图1中的处理器101和处理器107。作为再一种可实现方式，通信装置100还可以包括输出设备105和输入设备106。As an implementable manner, the processor 101 may include one or more CPUs, for example, CPU0 and CPU1 in FIG. 1 . As another implementable manner, the communications apparatus 100 may include multiple processors, for example, the processor 101 and the processor 107 in FIG. 1 . As yet another implementable manner, the communication apparatus 100 may further include an output device 105 and an input device 106 .
以下，对本申请实施例涉及的名词进行解释，以方便读者理解。In the following, nouns involved in the embodiments of the present application are explained for the convenience of readers' understanding.
1、5G异网漫游1. 5G different network roaming
5G异网漫游指的是归属于运营商B的终端设备接入到运营商A的5G网络中，由运营商A为该终端设备提供5G网络服务的漫游方法。其中，运营商B也称为归属运营商B，运营商A也称为归属运营商A。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. Wherein, the operator B is also called the home operator B, and the operator A is also called the home operator A.
5G异网漫游通常用于某一区域已被内运营商A的5G网络覆盖，而未被运营商A的5G网络覆盖的场景中。基于5G异网漫游的建网方式可以当前加快5G基础建设，减少5G网络重复建设的，集约高效的实现5G网络覆盖和业务发展。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.
当前，5G异网漫游包括5G核心网漫游和5G接入网漫游两种方式。本申请主要涉及5G核心网漫游，以下对5G核心网漫游的实现方式进行具体说明。Currently, 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.
2、5G核心网漫游2. 5G core network roaming
5G核心网漫游指的是在某一网络覆盖区域内，若某一家运营商(例如运营商A)在该区域内建成了的5G网络(包括接入网和核心网的建设)的建设，那么其他运营商(运营商B)所属的终端设备也可以通过漫游的方式接入到运营商A建设的5G网 络内，由运营商A的5G网络为运营商B所属的终端设备提供5G网络服务。在该情况下，对于该终端设备来说，运营商A记为漫游运营商，运营商B记为归属运营商，该网络覆盖区域记为漫游区域。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. In this case, for the terminal device, operator A is marked as a roaming operator, operator B is marked as a home operator, and the network coverage area is marked as a roaming area.
在5G核心网漫游中，基于归属运营商在漫游区域内是否存在无线信号，将5G核心网漫游划分为如下两种场景。In 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.
场景1、归属运营商在漫游区域内无任何无线网络信号，漫游运营商在漫游区域内有4G或5G信号，终端设备只使用漫游网络的5G网络。 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.
具体来说，在场景1中包括漫出场景和漫回场景。以下，分别进行说明：Specifically, scene 1 includes a spill-out scene and a roam-back scene. In the following, they are explained separately:
漫出场景：当终端设备进入漫游区域，终端设备优先使用漫游运营商的5G网络为终端设备提供5G网络的漫游服务；漫游运营商不为终端设备提供4G网络的漫游服务。在该场景下，漫游运营商不支持终端设备的语音业务回落到漫游运营商的4G网络。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.
漫回场景：用户的终端设备离开漫游区域，并搜索到归属运营商网络信号(可以是4G网络信号，也可以是5G网络信号)。终端设备回归到归属运营商网络中，由归属运营商为终端设备提供网络服务。在该场景下，终端设备可以正常的进行语音业务回落。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. In this scenario, the terminal device can normally perform voice service fallback.
在场景1的漫出场景下，由于归属运营商网络在漫游区域内没有任何网络信号，因此，在场景1中默认归属运营商的终端设备在漫游到共享区域之后只在漫游网络的5G网络中进行业务。在该场景下，漫游运营商将不需要支持终端设备的业务连续性。In the roaming scenario of Scenario 1, since the home operator network does not have any network signal in the roaming area, in Scenario 1, by default, 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.
但是在场景1的漫出场景下，终端设备从归属运营商网络(以下简称归属网络)移动到漫游运营商网络(以下简称漫游网络)时，终端设备从归属网络断开之后，需要经过较长时间的脱网重搜才能重新接入到漫游网络中。这将可能导致用户正在进行的业务中断较长时间用户体验较差。However, in the roaming scenario of Scenario 1, 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.
场景2、归属运营商在漫游区域内有4G网络信号无5G网络信号，漫游运营商在漫游区域内有4G或5G网络。终端设备在漫游区域内优先使用漫游运营商的5G网络，在漫游运营商的5G网络覆盖不足时，使用归属运营商的4G网络。 Scenario 2. 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.
场景2中同样包括漫出场景和漫回场景，以下分别进行说明。 Scene 2 also includes the overflow scene and the overflow scene, which will be described respectively below.
漫出场景：当用户的终端设备进入漫游区域，终端设备优先使用漫游运营商的5G网络为终端设备提供5G网络的漫游服务。在漫游运营商的5G网络覆盖不足时，终端设备使用归属运营商的4G网络。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.
漫回场景：用户的终端设备离开漫游区域，并搜索到归属运营商网络信号(可以是4G网络信号，也可以是5G网络信号)。终端设备回归到归属运营商网络中，由归属运营商为终端设备提供网络服务。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.
目前尚未对场景2中业务连续性的方法进行讨论，且目前尚无业务标准和设备支持场景2中的业务连续性。因此，如何提高业务5G异网漫游场景下业务的连续性成为当前急需解决的技术问题。The business continuity method in Scenario 2 has not been discussed yet, and there is no service standard and equipment to support the business continuity in Scenario 2 at present. Therefore, how to improve service continuity in the 5G inter-network roaming scenario has become an urgent technical problem to be solved.
在本申请实施例中，主要用于解决上述5G核心网漫游中的场景2中语音业务连续问题。In this embodiment of the application, it is mainly used to solve the problem of voice service continuity in Scenario 2 of the above-mentioned 5G core network roaming.
如图2所示，为本申请实施例提供的一种在5G核心网漫游中终端设备的移动性 示意图。在场景2中包括区域1和区域2，其中，归属运营商的5G网络覆盖区域1，漫游运营商的5G网络覆盖区域2(区域2又称为漫游区域)，归属运营商的4G网络既覆盖上述区域1，又覆盖上述区域2。As shown in Figure 2, it is a schematic diagram of the mobility of a terminal device in 5G core network roaming provided by the embodiment of this application. 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 .
当终端设备在如图2所示的区域1和区域2之间移动时，终端设备的移动情况至少包括以下情况1-情况4。When the terminal device moves between area 1 and area 2 as shown in FIG. 2 , the movement conditions of the terminal device include at least the following cases 1-4.
情况1、终端设备从归属运营商的4G网络移动到漫游运营商的5G网络。 Case 1. The terminal device moves from the 4G network of the home operator to the 5G network of the roaming operator.
情况2、终端设备从漫游运营商的5G网络移动到归属运营商的4G网络。 Case 2. The terminal device moves from the roaming operator's 5G network to the home operator's 4G network.
情况3、终端设备从归属运营商的5G网络移动到漫游运营商的5G网络。Case 3: The terminal device moves from the 5G network of the home operator to the 5G network of the roaming operator.
情况4、终端设备从漫游运营商的5G网络移动到归属运营商的5G网络。Case 4: The terminal device moves from the roaming operator's 5G network to the home operator's 5G network.
如图3所示，为本申请实施例提供的一种5G核心网漫游场景下归属网络和漫游网络的连接示意图。As shown in 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.
其中，归属网络中包括归属运营商5G核心网、归属运营商4G核心网、归属运营商网际互连协议(internet protocol，IP)多媒体***(IP multimedia subsystem，IMS)网络、归属运营商5G接入网、以及归属运营商4G接入网。Among them, 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.
漫游网络中包括漫游运营商5G核心网以及漫游运营商5G接入网。The roaming network includes the roaming operator's 5G core network and the roaming operator's 5G access network.
在5G核心网漫游场景下，当终端设备从归属网络移动到漫游网络之后，终端设备在漫游网络中产生的数据采用归属路由方式返回到归属网络中，由归属网络对终端设备产生的业务数据进行处理。归属网络的核心网(包括归属运营商5G核心网(5G Core，5GC)和归属运营商4G核心网分组核心网(evolved packet core，EPC)和漫游网络核心网(包括漫游运营商5GC)的信令面通过安全边缘保护代理(security edge protection proxies，SEEP)连接。用户面则通过归属网络和拜访网络之间的用户面功能(user plane function，UPF)通过边缘路由器连接。归属网络和漫游网络的SEEP之间的N32接口汇聚隔离了归属网络和漫游网络之间的N8、N12、N16、N24、N27、N31接口。上述接口的接口类型和接入位置如下述表1所示In the roaming scenario of the 5G core network, after the terminal device moves from the home network to the roaming 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. deal with. 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). The user plane is connected through the edge router through the user plane function (UPF) between the home network and the visited network. 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
表1Table 1
Figure PCTCN2022134821-appb-000001
Figure PCTCN2022134821-appb-000001
当前的相关标准中尚未定义归属网络和漫游网络之间的互操作接口N26接口(归属移动性管理实体(Mobility Management Entity，MME)和漫游认证管理功能 (AuthenticationManagementFunction，AMF)之间的N26接口，也称为hMME和vAMF之间的N26接口)，以及N14接口(hAMF和vAMF之间的N14接口)。The current relevant standards have not yet defined the interoperability interface 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).
由于当前相关标准中未定义归属网络和漫游网络之间的N26接口，也未定义基于有N26接口的跨运营商网络的互操作流程、以及无N26接口的跨运营商网络的互操作流程。这就导致归属运营商的终端设备在归属网络的4G网络(记为归属4G网络)和漫游运营商的5G网络(记为漫游5G网络)之间移动时要中断终端设备原有的协议数据单元(Protocol Data Unit，PDU)会话，在终端设备移动到新的网络之后再新的网络上建立PDU会话，这将导致终端设备的业务在移动过程中终端，业务连续性无法保证。Since the N26 interface between the home network and the roaming network is not defined in the current relevant standards, 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). (Protocol Data Unit, PDU) session, after the terminal device moves to a new network, a PDU session is established on the new network, which will cause the service of the terminal device to be terminated during the moving process, and business continuity cannot be guaranteed.
为了解决现有技术中终端设备在归属4G网络和漫游5G网络之间移动时，无法保证终端设备的语音业务连续性的问题，本申请对当前的网元、信令消息和终端设备进行以下扩展，以下分别进行说明。In order to solve the problem in the prior art that the continuity of the voice service of the terminal equipment cannot be guaranteed when the terminal equipment moves between the home 4G network and the roaming 5G network, this application makes the following extensions to the current network elements, signaling messages and terminal equipment , which are described below.
1、对网元的扩展。1. Expansion of network elements.
其中，对网元的扩展包括：1.1、对AMF的扩展，以及1.2、对MME的扩展。以下分别进行详细说明：Wherein, the extension to the network element includes: 1.1, the extension to the AMF, and 1.2, the extension to the MME. The following are detailed descriptions respectively:
1.1、对5G网络的AMF进行如下扩展。1.1. The AMF of the 5G network is extended as follows.
AMF与同一运营商网络中的MME之间配置N26接口，AMF与不同运营商网络的MME之间不配置N26接口。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.
基于此，可以减少不同运营商网络之间的接口数量，减少需要不同运营商网络之间需要配合的工作量。Based on this, the number of interfaces between different operator networks can be reduced, and the workload that requires coordination between different operator networks can be reduced.
在终端设备向AMF发起注册时，AMF可以根据终端设备的公共陆地移动网(Public Land Mobile Network，PLMN)标识为终端设备下发不同的指示信息，指示AMF所支持的互操作能力。When the terminal device initiates registration with the AMF, 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.
具体来说，在漫游运营商的终端设备在该漫游运营商的5G网络内注册时，AMF向该终端设备下发支持网内N26接口的能力，以及支持基于网内的N26接口的互操作(记为第二互操作)能力。Specifically, when a terminal device of a roaming operator registers in the roaming operator's 5G 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.
在归属运营商的终端设备在漫游运营商的5G网络内注册时，AMF向该终端设备下发不支持网间N26接口的能力，以及支持第一互操作的能力。When the terminal device of the home operator registers in the 5G network of the roaming operator, 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.
一种示例，针对运营商A和运营商B的AMF，可以根据终端设备携带的PLMN ID为终端设备下发AMF的N26接口支持能力和互操作能力。In one example, for the AMF of operator A and operator B, 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.
运营商A的AMF与运营商A网内的MME之间配置有N26接口，在运营商A的终端设备A向运营商A的AMF发起注册时，运营商A的AMF向终端设备A下发支持运营商A网内的N26接口，并支持第二互操作能力。终端设备A在运营商A的4G网络和5G网络之间移动时，可直接根据运营商A网内的N26接口进行4G和5G的互操作。The N26 interface is configured between the AMF of operator A and the MME in the network of operator A. When the terminal equipment A of operator A initiates registration with the AMF 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. When 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.
运营商B的AMF与运营商B网内的MME之间配置有N26接口，在运营商B的终端设备B向运营商B的AMF发起注册时，运营商B的AMF向终端设备B下发支持运营商B网内的N26接口，并支持第二互操作能力。终端设备B在运营商B的4G网络和5G网络之间移动时，可直接根据运营商B网内的N26接口进行4G和5G的互操作。An N26 interface is configured between the AMF of carrier B and the MME in the network of carrier B. When the terminal device B of carrier B initiates registration with the AMF 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. When 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.
运营商A的AMF和运营商B的MME之间未配置N26接口，在运营商B的终端设备B向运营商A的AMF发起注册时，运营商A的AMF向终端设备B下发不支持网间N26接口，以及支持第一互操作能力。终端设备B在运营商A的5G网络和运营商B的4G网络之间移动时，第一互操作能力进行终端设备B的移动性过程。The N26 interface is not configured between the AMF of carrier A and the MME of carrier B. When the terminal device B of carrier B initiates registration with the AMF of carrier A, the AMF of carrier A sends the unsupported network Inter-N26 interface, and support the first interoperability. When 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.
需要指出的是，在涉及到多个运营商之间的漫游时，其配置过程与上述两个运营商的配置过程类似，本申请对此不在赘述。It should be pointed out that when it comes to roaming between multiple operators, the configuration process is similar to the configuration process of the above two operators, which will not be repeated in this application.
1.2、对EPC的MME进行如下扩展。1.2. The MME of the EPC is extended as follows.
MME与同一运营商网络中的AMF之间配置N26接口，MME与不同运营商网络的AMF之间不配置N26接口。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.
基于此，可以减少不同运营商网络之间的接口数量，减少需要不同运营商网络之间需要配合的工作量。Based on this, the number of interfaces between different operator networks can be reduced, and the workload that requires coordination between different operator networks can be reduced.
在终端设备向MME发起注册时，MME可以根据终端设备的PLMN标识为终端设备下发不同的指示信息，指示MME所支持的互操作能力。When the terminal device initiates registration with the MME, 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.
具体来说，在归属运营商的终端设备在归属运营商的4G网络内注册时，MME向该终端设备下发支持网内N26接口，以及支持基于网内的N26接口的互操作能力。Specifically, when the terminal device of the home operator registers in the 4G network of the home operator, 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.
此外，MME还向终端设备下发不支持网间N26接口，以及支持第一互操作能力。In addition, the MME also issues to the terminal equipment the capability of not supporting the N26 interface between networks and supporting the first interoperability.
一种示例，针对运营商A和运营商B的MME，可以根据终端设备携带的PLMN标识为终端设备下发MM的N26接口支持能力和互操作能力。In one example, for the MMEs of operator A and operator B, 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.
运营商A的MME与运营商A网内的AMF之间配置有N26接口，在运营商A的终端设备A向运营商A的MME发起注册时，运营商A的MME向终端设备A下发支持运营商A网内的N26接口，并支持第二互操作能力。终端设备A在运营商A的4G网络和5G网络之间移动时，可直接根据运营商A网内的N26接口进行4G和5G的互操作。The N26 interface is configured between the MME of operator A and the AMF in the network of operator A. When the terminal equipment A of operator A initiates registration with the MME 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. When 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.
运营商B的MME与运营商B网内的AMF之间配置有N26接口，在运营商B的终端设备B向运营商B的MME发起注册时，运营商B的MME向终端设备B下发支持运营商B网内的N26接口，并支持第二互操作能力。终端设备B在运营商B的4G网络和5G网络之间移动时，可直接根据运营商B网内的N26接口进行4G和5G的互操作。The N26 interface is configured between the MME of operator B and the AMF in the network of operator B. When the terminal equipment B of operator B initiates registration with the MME 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. When 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.
运营商B的MME与运营商A网内的AMF之间未配置N26接口，在运营商B的终端设备B向运营商B的MME发起注册时，运营商B的MME向终端设备B下发不支持网间N26接口，以及支持第一互操作能力。终端设备B在运营商A的5G网络和运营商B的4G网络之间移动时，第一互操作能力进行终端设备B的移动性过程。The N26 interface is not configured between the MME of carrier B and the AMF in the network of carrier A. When terminal device B of carrier B initiates registration with the MME of carrier B, the MME of carrier B sends an Support the N26 interface between networks, and support the first interoperability. When 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.
在终端设备B是由运营商A的5G网络移动到运营商B的4G网络的情况下，终端设备B会向运营商B的4G网络中的MME(记为hMME)发送跟踪区更新(Tracking Area Update，TAU)消息，TAU消息中携带演进的分组***(Evolved Packet System，EPS)-全球唯一临时标识(Globally Unique Temporary Identity，GUTI)，该EPS-GUTI是从终端设备在运营商A的5G网络的5G-GUTI映射得到的。hMME确定中终端设备触发TAU流程的old MME的类型为AMF，且根据TAU消息中的最近访问的TAI中确定终端设备移动前的运营商与该MME所属的运营商之间无N26接口，MEE向终端 设备发送TAU拒绝(TAU reject)消息。这样终端设备可以通过发起附着请求，将终端设备在漫游5G网络中的PDU会话迁移到归属4G网络中。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. 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.
以上，对本申请涉及的网元的扩展进行了说明，以下，对本申请涉及的信令的扩展进行说明。The extension of the network element involved in the present application has been described above, and the extension of the signaling involved in the present application will be described below.
2、信令消息的扩展。2. Expansion of the signaling message.
在信令消息的扩展中包括：2.1、5G信令消息的扩展，以及2.2、4G信令消息的扩展。以下分别进行说明。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.
2.1、5G信令消息的扩展。2.1. Extension of 5G signaling messages.
在5G信令的扩展中，主要是对终端设备和AMF之间交互的注册消息进行扩展。扩展后的终端设备向AMF发送的信令消息用于指示终端设备是否支持第一互操作流程，扩展后的AMF向终端设备发送的信令消息指示AMF是否支持第一互操作流程。In 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.
具体来说，5G信令消息的扩展包括：2.1.1、对注册请求(Registration Request)消息的扩展，以及2.1.2、对注册响应(Registration Accept)消息的扩展。以下分别进行说明。Specifically, 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.
2.1.1、对注册请求消息的扩展。2.1.1. The extension to the registration request message.
注册请求消息是终端设向5G网络的AMF发送的用于请求注册的请求消息。The registration request message is a request message sent by the terminal device to the AMF of the 5G network for requesting registration.
本申请中可以在注册请求消息中扩展用于指示终端设备是否支持第一互操作。此外，还可以在注册请求消息中扩展用于指示终端设备是否支持第二互操作。In this application, the registration request message may be extended to indicate whether the terminal device supports the first interoperation. In addition, the registration request message may also be extended to indicate whether the terminal device supports the second interoperation.
一种示例，注册请求消息中扩展HO_attach_inter PLMN字段，用于指示终端设备是否支持第一互操作。在注册请求消息中扩展HO_attach_intra PLMN字段，用于指示终端设备是否在支持第二互操作。In one example, 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.
其中，HO_attach_intra PLMN字段可以复用当前5GMM Capability字段中的H0_attach指示位。也即将5GMM Capability字段中的H0_attach指示位扩展为HO_attach_intra PLMN字段。Among them, 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.
HO_attach_inter PLMN字段可以从5GMM Capability字段中预留(例如，可以是第5字节的第5-8个比特位和第6-15个字节预留的比特位)的比特位中选取一个比特位作为HO_attach_inter PLMN字段的指示位。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.
当前，5GMM Capability字段主要用于标识与4G EPS互操作时的能力支持情况；H0_attach指示位(第三字节的第2个比特位)用于表示终端是否支持切换(Handover)类型的附着(attach)。当前H0_attach指示位主要用于单注册终端工作在无N26接口的场景下，指示终端设备是否支持无N26接口的PLMN内部互操作流程。Currently, 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.
具体来说，在HO_attach_intra PLMN字段的值为“0”时，该字段用于表示终端设备支持第二互操作；在HO_attach_intra PLMN字段的值为“1”时，该字段用于表示终端设备不支持第二互操作。Specifically, when the value of the HO_attach_intra PLMN field is "0", this field is used to indicate that the terminal device supports the second interoperability; when the value of the HO_attach_intra PLMN field is "1", this field is used to indicate that the terminal device does not support Second interoperability.
在HO_attach_inter PLMN字段的值为“0”时，该字段用于表示终端设备支持第一互操作。此时，终端设备支持无N26接口的跨PLMN的ATTACH REQUEST。ATTACH REQUEST中包括PDN CONNECTIVITY REQUEST消息，该消息的请求类型设置为“切换(handover)”或者“紧急承载服务切换(handover of emergency bearer services)”，用于把PDU会话从N1接口传输到S1接口。(ATTACH 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)When the value of the HO_attach_inter PLMN field is "0", this field is used to indicate that the terminal device supports the first interoperation. At this time, 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. (ATTACH 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)
在HO_attach_inter PLMN字段的值为“1”时，该字段用于表示终端设备不支持第一互操作。此时，终端设备不支持无N26接口的跨PLMN的ATTACH REQUEST。ATTACH REQUEST的理解可以参照前述描述，此处不再赘述。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. The understanding of ATTACH REQUEST can refer to the previous description, so I won’t go into details here.
需要指出的是，在本申请中对注册请求(Registration Request)消息的扩展属于可选的方案，在具体实现中也可以不对注册请求(Registration Request)消息进行扩展，终端设备可以直接根据网络设备下发的注册响应(Registration Acceptt)进行第一互操作。It should be pointed out that in this application, the extension of the registration request (Registration Request) message is an optional solution. In the specific implementation, 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.
2.1.2、对注册响应消息的扩展。2.1.2. Extension of registration response message.
注册响应消息是AMF在接收到来自终端设备的注册请求消息之后，向终端设备发送的消息。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.
在本申请中可以在注册响应消息中扩展用于指示AMF不支持N26接口，且AMF支持第一互操作。In this application, 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.
一种示例，在注册响应消息中扩展Iwk_n26_intra PLMN字段，用于指示AMF是否支持第二互操作。在注册响应消息中扩展Iwk_n26_inter PLMN字段，用于指示AMF支持第一互操作。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.
其中，Iwk_n26_intra PLMN字段可以复用当前Registration Accept消息中的5GS network feature support字段的Iwk_n26(第3字节的第7个比特位)指示位。也即将5GS network feature support字段中的Iwk_n26指示位扩展为Iwk_n26_intra PLMN字段。Among them, 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.
Iwk_n26_inter PLMN字段可以从5GS network feature support字段预留的比特位(例如，第5个字节的4-8个比特位)中选择一个比特位作为Iwk_n26_inter PLMN字段的指示位。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.
当前，通常只在同一运营商的网内配置有N26接口，而未考虑不同运营商网间的N26接口配置情况，因此当前的5GS network feature support字段中的Iwk_n26指示为用于指示网络设备是否支持N26接口的互操作(特指同一运营商的网内的N26接口)。在本申请中，由于还需要指示第一互操作，因此将Iwk_n26扩展为Iwk_n26_intra PLMN字段，同时增加指示第一互操作的Iwk_n26_inter PLMN字段。Currently, 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). In this application, since it is also necessary to indicate the first interoperation, 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.
具体来说，在Iwk_n26_intra PLMN字段的值为“0”时，该字段用于表示AMF不支持第二互操作。在Iwk_n26_intra PLMN字段的值为“1”时，该字段用于表示AMF支持第二互操作。Specifically, when the value of the Iwk_n26_intra PLMN field is "0", this field is used to indicate that the AMF 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.
在Iwk_n26_inter PLMN字段的值为“0”时，该字段用于表示AMF支持第一互操作。在Iwk_n26_inter PLMN字段的值为“1”时，该字段用于表示AMF不支持第一互操作。When the value of the Iwk_n26_inter PLMN field is "0", this field is used to indicate that the AMF supports the first interoperation. When the value of the Iwk_n26_inter PLMN field is "1", this field is used to indicate that the AMF does not support the first interoperation.
2.2、4G信令消息的扩展2.2. Expansion of 4G signaling messages
在4G信令的扩展中，主要是对终端设备和MME之间交互的附着消息进行扩展。扩展后的终端设备向MME发送的信令消息用于指示终端设备是否支持跨PLMN的N1接口(N1mode)，N1接口为5G网络接口。扩展后的MME向终端设备发送的信令 消息用于指示MME是否支持第一互操作。In the extension of 4G signaling, 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.
具体来说，4G信令消息的扩展包括：2.2.1、对附着请求(Attach Request)消息的扩展，以及2.2.2、对附着响应(Attach Accept)消息的扩展。以下分别进行说明。Specifically, 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.
2.2.1、对附着请求消息的扩展2.2.1. Extension of attach request message
附着请求消息是终端设备向4G网络的MME发送的用于请求注册的请求消息。The attach request message is a request message sent by the terminal device to the MME of the 4G network for requesting registration.
在本申请中，可以在附着请求消息中扩展用于指示终端设备是否支持跨PLMN的N1接口。In this application, the N1 interface used to indicate whether the terminal device supports cross-PLMN can be extended in the attach request message.
一种示例，在当前附着请求的UE network capability字段中，包括N1接口指示位：N1mode。但是该指示位主要用于指示终端设备是否支持PLMN内容的N1接口。An example, in the UE network capability field of the current attach request, includes an N1 interface indication bit: N1mode. However, this indicator bit is mainly used to indicate whether the terminal device supports the N1 interface of the PLMN content.
本申请中在UE network capability字段保留的比特位(例如，第10字节的第6-8比特和第11字节)中扩展用于表示是否支持跨PLMN的N1接口的字段。在该字段的值为0时，表示终端设备不支持跨PLMN的N1接口。在该字段的值为1时，表示终端设备支持跨PLMN的N1接口。In this application, 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). When the value of this field is 0, it means that the terminal device does not support the N1 interface across PLMNs. When the value of this field is 1, it indicates that the terminal device supports the N1 interface across PLMNs.
2.2.2、对附着响应消息的扩展。2.2.2. Extension of attach response message.
附着响应消息是MME在接收到来自终端设备的附着请求消息之后，向终端设备发送的消息。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.
在本申请中，可以在附着响应消息中扩展用于指示MME支持第一互操作。In this application, the attachment response message may be extended to indicate that the MME supports the first interoperation.
一种示例，在附着响应消息中扩展Iwk_n26_intra PLMN字段，用于指示MME是否支持第二互操作。在附着响应消息中扩展Iwk_n26_inter PLMN字段，用于指示MME支持第一互操作。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.
其中，Iwk_n26_intra PLMN可以复用当前Attach Accept消息中的带EPS network feature support字段的Iwk_n26指示位(第4字节的第7个比特)。也即将EPS network feature support字段的Iwk_n26指示位扩展为Iwk_n26_intra PLMN字段。Among them, 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.
EPS network feature support字段是一个包括4个字节的字段，主要用于表示MME与3G网络或者5G网络的互操作时支持的能力情况。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.
由于目前EPS network feature support字段已经没有预留字节和比特位，因此可以将EPS network feature support字段扩展为5个字节，在扩展的第5个字节中，选择一个比特作为Iwk_n26_inter PLMN字段的指示位。Since the current EPS network feature support field has no reserved bytes and bits, 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.
具体来说，在Iwk_n26_intra PLMN字段的值为“0”时，该字段用于表示MME不支持第二互操作。在Iwk_n26_intra PLMN字段的值为“1”时，该字段用于表示AMF支持第二互操作。Specifically, 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.
在Iwk_n26_inter PLMN字段的值为“0”时，该字段用于表示AMF支持第一互操作。在Iwk_n26_inter PLMN字段的值为“1”时，该字段用于表示AMF不支持第一互操作。When the value of the Iwk_n26_inter PLMN field is "0", this field is used to indicate that the AMF supports the first interoperation. When the value of the Iwk_n26_inter PLMN field is "1", this field is used to indicate that the AMF does not support the first interoperation.
需要指出的是，Iwk_n26_intra PLMN字段除了用于指示网元是否支持第二互操作之外，还可以用于表示网元是否支持同一PLMN内的N26接口(也即同一PLMN内的AMF和MME之间是否配置有N26接口)。It should be pointed out that, in addition to being used to indicate whether the network element supports the second interoperability, 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).
例如，在Iwk_n26_intra PLMN字段的值为“0”时，该字段还用于表示MME与同一PLMN内的AMF之间未配置N26接口(或者，AMF与同一PLMN内的MME 之间未配置N26接口)。在Iwk_n26_intra PLMN字段的值为“1”时，该字段还用于表示MME与同一PLMN内的AMF之间配置有N26接口(或者，AMF与同一PLMN内的MME之间配置有N26接口)。For example, when 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) . When 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).
同样的，Iwk_n26_inter PLMN字段除了用于指示网元是否支持第一互操作之外，还可以用于表示网元是否支持跨PLMN的N26接口(也即跨PLMN的AMF和MME之间是否配置有N26接口)。Similarly, 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).
例如，在Iwk_n26_inter PLMN字段的值为“0”时，该字段用于表示AMF与跨PLMN的MME之间未配置N26接口(或者，MME与跨PLMN的AMF之间未配置N26接口)。在Iwk_n26_inter PLMN字段的值为“1”时，该字段用于表示AMF与跨PLMN的MME之间配置有N26接口(或者，MME与跨PLMN的AMF之间配置有N26接口)。For example, when 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). When 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).
同样的，关于HO_attach_inter PLMN字段和HO_attach_intra PLMN字段也可以参照上述关于Iwk_n26_inter PLMN字段和Iwk_n26_intra PLMN字段进行理解，本申请对此不在赘述。Similarly, 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.
以上，对本申请涉及到的信令消息的扩展进行了说明。需要指出的是，以上对信令消息的扩展仅为示例性说明，在具体实现过程中，通过对具体的哪些信令消息进行扩展是本领域的技术人员可以根据实际需求灵活选择的，只需实现上述扩展后的信令的相关功能即可，本申请不对扩展的信令消息以及信令消息中的字段，字段中的比特位进行具体限定。The extension of the signaling message involved in the present application has been described above. It should be pointed out that the above extensions to the signaling messages are only exemplary illustrations. In the specific implementation process, those skilled in the art can flexibly choose which specific signaling messages to expand according to actual needs. It is sufficient to realize the relevant functions of the above-mentioned extended signaling, and the present application does not specifically limit the extended signaling message, the fields in the signaling message, and the bits in the fields.
3、对终端设备的扩展。3. Expansion of terminal equipment.
根据上述对信令消息的扩展，终端设备需要支持上述扩展后的信令消息。这样，终端设备可以生成相应的信令消息向网络设备指示终端设备所支持的能力，以及根据网络设备下发的扩展后的信令消息，确定网络设备支持的能力。此外，终端设备还可以根据终端设备和网络设备支持的能力，执行第一互操作流程。According to the above-mentioned extension of the signaling message, the terminal device needs to support the above-mentioned extended signaling message. In this way, 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. In addition, the terminal device may also execute the first interoperability procedure according to the capabilities supported by the terminal device and the network device.
3.1、针对5G信令消息。3.1. For 5G signaling messages.
一种示例，根据对上述5G信令消息中的注册请求消息和注册响应消息的扩展，终端设备需要扩展支持扩展后的注册请求消息，以及扩展后的注册响应消息。In one example, according to the extension of the registration request message and the registration response message in the above 5G signaling message, the terminal device needs to extend and support the extended registration request message and the extended registration response message.
具体来说，结合扩展后的注册请求消息，本申请对终端设备进行扩展，使得终端设备能够生成扩展后的注册请求消息，终端设备将S1接口设置为1，表示终端设备支持4G网络的接口。Specifically, combined with the extended registration request 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.
结合扩展后的注册响应消息，本申请对终端设备进行扩展，使得终端设备能够识别Registration Accept消息中的5GS network feature support字段中的Iwk_n26_intra PLMN和Iwk_n26_inter PLMN的指示位，并根据该指示位的值确定AMF是否支持第一互操作。Combined with the extended registration response message, 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.
如果终端设备接收到的来自AMF的Registration Accept消息中的5GS network feature support字段中包括Iwk_n26_inter PLMN的指示位，且该指示位的值为0，终端设备确定AMF不支持跨PLMN的N26接口，此时终端设备需要执行第一互操作流程以保持终端设备的业务连续性。在第一互操作流程中，终端设备向MME发送初始附着(Initial Attach)消息，携带的请求类型(Request type)为切换(Handover)，初始 附着消息中包括数据网络名称(Data network name，DNN)或接入点名称(Access Point Name，APN)、PDU Session ID、PDN CONNECTIVITY Request消息，EPS bearer status设置为empty。If the 5GS network feature support field in the Registration Accept message received by the terminal device from the AMF includes the Iwk_n26_inter PLMN indicator bit, and the value of the indicator bit is 0, 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. In the first interoperability process, 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.
3.2、针对4G信令消息。3.2. For 4G signaling messages.
一种示例，根据上述对4G信令消息中的附着请求消息和附着响应消息，终端设备需要扩展支持扩展后的附着请求消息，以及扩展后的附着响应消息。In one example, according to the above-mentioned attachment request message and attachment response message in the 4G signaling message, the terminal device needs to expand and support the extended attachment request message and the extended attachment response message.
具体来说，结合扩展后的附着请求消息，本申请对终端设备进行扩展，使得扩展后的终端设备能够生成用于表示是否支持跨PLMN的N1接口的字段。Specifically, in combination with the extended attach request 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.
针对扩展后的附着响应消息，本申请对终端设备进行扩展，使得扩展后的终端设备能够识别Attach Accept中的EPS network feature support字段中的Iwk_n26_intra PLMN和Iwk_n26_inter PLMN的指示位。其具体扩展可以参照上述3.1中终端设备针对5G信令消息的扩展，此次不再赘述。For the extended attach response message, 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. 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.
以上对本申请涉及到的对网元、信令消息以及终端设备的扩展进行了介绍。The above describes the extension of network elements, signaling messages and terminal equipment involved in this application.
需要指出的是，上述对网元、信令消息以及终端设备的扩展并非是必须全部进行的扩展，在具体运用时，可以根据实际需求选择相应的扩展。It should be pointed out that the above-mentioned extensions to network elements, signaling messages, and terminal equipment are not necessarily all extensions, and corresponding extensions can be selected according to actual needs during specific applications.
例如，在针对AMF和5G信令消息的扩展中，AMF可以不扩展识别和生成Iwk_n26_intra PLMN字段和Iwk_n26_inter PLMN字段的能力。For example, in the extension for AMF and 5G signaling messages, AMF may not extend the ability to identify and generate the Iwk_n26_intra PLMN field and the Iwk_n26_inter PLMN field.
AMF仅需扩展识别终端设备的PLMN、或者IMSI号段，并根据PLMN、或者IMSI号段为终端设备下发不同值的Iwk_n26字段即可。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.
在该情况下，针对同一运营商的终端设备(例如AMF为运营商A的AMF，终端设备也为运营商A的终端设备)，AMF下发值为第四目标值的第二预设字段，用于指示AMF支持第二互操作。In this case, 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.
针对不同运营商的终端设备(例如AMF为运营商A的AMF，终端设备为运营商B的终端设备)AMF下发值为第二目标值的第二预设字段。用于指示AMF支持第一互操作。For terminal devices of different operators (for example, the AMF is the AMF of operator A, and the terminal device is the terminal device of operator B), 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.
一种示例，第二目标值的取值为0，第四目标值的取值为1，第二预设字段为Iwk_n26字段。In one example, 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.
这是由于，在终端设备与AMF为同一运营商的情况下，终端设备漫出该运营商的网络时可以通过先移动到该运营商的4G网络，然后在移动到其他运营商的5G网络的方式进行，此时，AMF只需支持针对该终端设备的第二互操作，而无需支持针对该终端设备的第一互操作。因此，AMF为该终端设备下发值为第四目标值的第二预设字段，用于指示AMF支持同一运营商内的N26接口，支持第二互操作。This is because, when the terminal device and the AMF are of the same operator, when the terminal device roams out of the operator's network, it can first move to the operator's 4G network, and then move to other operator's 5G network. In this case, the AMF only needs to support the second interoperation for the terminal device, but does not need to support the first interoperation for the terminal device. Therefore, 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.
在终端设备与AMF为不同运营商的情况下，终端设备不会移动到该运营商的4G网络，此时，AMF只需支持针对该终端设备的第一互操作，而无需支持针对该终端设备的第二互操作。因此，AMF为该终端设备下发值为第二目标值的第二预设字段，用于指示AMF不支持跨PLMN的N26接口，支持第一互操作。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.
因此，在该情况下，本申请也可以不将Iwk_n26字段扩展为Iwk_n26_intra PLMN字段，同时也无需在增加Iwk_n26_inter PLMN字段。Therefore, in this case, 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.
同样的，在该情况下，终端设备也无需将H0_attach字段扩展为HO_attach_intra  PLMN字段，并新增HO_attach_inter PLMN字段。Similarly, in this case, 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.
终端设备只需将H0_attach字段的值设置为1，表示终端设备支持H0_attach能力，关于终端杆设备支持的互操作(包括第一至第四互操作)的能力，可以通过AMF向终端设备下发的Iwk_n26字段或者Iwk_n26_intra PLMN字段和Iwk_n26_inter PLMN字段实现。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.
这样，可以在对终端设备、网元和信令消息进行较小改动的情况下，实现网元互操作能力的下发。In this way, the distribution of network element interoperability can be realized with minor changes to terminal equipment, network elements, and signaling messages.
以下，对本申请涉及到的第一互操作，第二互操作，第三互操作和第四互操作进行介绍。Hereinafter, the first interoperation, the second interoperation, the third interoperation and the fourth interoperation involved in this application will be introduced.
a)、第一互操作用于保证终端设备在未配置互操作接口的PLMN网络之间移动时的业务连续性。具体来说，第一互操作用于表示支持未配置互操作接口两个PLMN网络之间的第一互操作。在本申请实施例中，第一互操作具体可以为无N26接口的跨PLMN的互操作。例如，未配置N26接口的漫游5G网络和归属4G网络之间的互操作。a) 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. Specifically, 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. In this embodiment of the present application, 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.
b)、第二互操作用于保证终端设备在配置有互操作接口的同一PLMN网络内切换时的业务连续性。具体来说，第二互操作用于表示支持配置有N26接口的同一PLMN内的互操作。在本申请实施例中，第二互操作具体可以为有N26接口的同一PLMN内的互操作。例如配置有N26接口的归属4G网络和归属5G网络之间的互操作。b), 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. Specifically, the second interoperability is used to indicate that interoperability within the same PLMN configured with the N26 interface is supported. In this embodiment of the present application, 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.
c)、第三互操作用于保证终端设备在配置有互操作接口的PLMN网络之间移动时的业务连续性。具体来说，第一互操作用于表示支持配置有互操作接口两个PLMN网络之间的第三互操作。在本申请实施例中，第三互操作具体可以为有N26接口的跨PLMN的互操作。例如，配置有N26接口的漫游5G网络和归属4G网络之间的互操作。c), the third interoperation is used to ensure the service continuity when the terminal equipment moves between the PLMN networks configured with the interoperation interface. Specifically, the first interoperation is used to indicate that the third interoperation between the two PLMN networks configured with the interoperation interface is supported. In this embodiment of the present application, 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.
需要说明的是，在本申请中，不支持第一互操作的情况包括支持第三互操作的情况。It should be noted that, in this application, the case of not supporting the first interoperation includes the case of supporting the third interoperation.
d)、第四互操作用于保证终端设备在未配置互操作接口的同一PLMN网络内切换时的业务连续性。具体来说，第四互操作用于表示支持未配置N26接口的同一PLMN内的互操作。在本申请实施例中，第四互操作具体可以为无N26接口的同一PLMN内的互操作。例如未配置N26接口的归属4G网络和归属5G网络之间的互操作。d), 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. Specifically, the fourth interoperation is used to indicate that the interoperation in the same PLMN that is not configured with the N26 interface is supported. In this embodiment of the present application, 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.
需要说明的是，在本申请中，不支持第二互操作的情况包括支持第四互操作的情况。It should be noted that, in this application, the case of not supporting the second interoperation includes the case of supporting the fourth interoperation.
以上，对本申请涉及到的第一互操作，第二互操作，第三互操作和第四互操作进行介绍。Above, the first interoperation, the second interoperation, the third interoperation and the fourth interoperation involved in this application are introduced.
以上，结合图4，对本申请提供的通信方法进行介绍，如图4所示，本申请提供的通信方法包括以下S401-S402：Above, in conjunction with FIG. 4, the communication method provided by this application is introduced. As shown in FIG. 4, the communication method provided by this application includes the following S401-S402:
S401、终端设备向核心网设备发送第一注册请求消息。相应的，核心网设备接收来自终端设备的第一注册请求消息。S401. The terminal device sends a first registration request message to the core network device. Correspondingly, the core network device receives the first registration request message from the terminal device.
其中，核心网设备可以为4G网络中的MME，或者核心网设备还可以为5G网络中的AMF。Wherein, 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.
一种可能的实现方式中，在终端设备向4G网络发起注册时，核心网设备为4G核心网中的MME，第一注册请求消息为终端设备向MME发送Attach Request消息。In a possible implementation manner, when the terminal device initiates registration to the 4G network, the core network device is an MME in the 4G core network, and the first registration request message is an Attach Request message sent by the terminal device to the MME.
此时，S401具体可以实现为：终端设备向4G网络的接入网设备(例如，eNodeB)发送的Attach Request消息，接入网设备接收到Attach Request消息之后向MME转发Attach Request消息。At this point, 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.
又一种可能的实现方式中，在终端设备向5G网络发起注册时，核心网设备为5G核心网中的AMF。第一注册请求消息为终端设备向AMF发送的Registration Request消息。In another possible implementation manner, when the terminal device initiates registration to the 5G network, 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.
此时，S401具体可以实现为：终端设备向5G网络的接入网设备(例如，5G基站)发送Registration Request消息。接入网设备接收到Registration Request消息之后，向AMF发送的Registration Request消息。At this time, 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.
S402、响应于第一注册请求消息，核心网设备向终端设备发送第一注册响应消息。相应的，终端设备接收来自核心网设备的第一注册响应消息。S402. In response to the first registration request message, the core network device sends a first registration response message to the terminal device. Correspondingly, the terminal device receives the first registration response message from the core network device.
其中，第一注册响应消息用于指示核心网设备支持第一互操作；第一互操作用于保证终端设备在未配置互操作接口的PLMN网络之间移动时的业务连续性。Wherein, 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.
一种可能的实现方式中，在核心网设备为MME时，S402具体可以实现为：MME向接入网设备发送Attach Accept消息。接入网设备接收到Attach Accept消息之后，向终端设备发送Attach Accept消息。In a possible implementation manner, when the core network device is an MME, 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.
又一种可能的实现方式中，在核心网设备为AMF是，S402具体可以实现为：AMF向接入网设备发送Registration Accept消息。接入网设备接收到Registration Accept消息之后，向终端设备发送Registration Accept消息。In yet another possible implementation manner, when the core network device is an AMF, 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.
上述技术方案至少带来以下有益效果：在终端设备向核心网设备进行注册的过程中，核心网设备指示终端设备支持能够保证终端设备在未配置互操作接口的PLMN网络之间移动时的业务连续性的第一互操作。这样，终端设备在从该网络移动到其他网络时，核心网设备可以通过与其他网络中的核心网设备交互进行第一互操作，将终端设备的业务迁移到其他网络中，从而保证终端设备的业务连续性。The above technical solution brings at least the following beneficial effects: during the registration process of the terminal device with the core network 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.
一种可能的实现方式中，在漫游5G网络的AMF接收到注册请求消息包括以下两种情况，分别为：情况1、AMF接收到来自相同运营商的终端设备的注册请求；情况2、AMF接收到来自不同运营商的终端设备的注册请求。在该情况下，AMF可以仅扩展根据终端杆设备的PLMN(或者IMSI号段)给终端设备下发不同的Iwk_n26字段即可。In a possible implementation, 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. In this case, 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.
结合图4，如图5所示，在S402之前，方法还包括：With reference to FIG. 4, as shown in FIG. 5, before S402, the method further includes:
S501、核心网设备确定终端设备所属的PLMN网络的标识。S501. The core network device determines the identifier of the PLMN network to which the terminal device belongs.
S502、在终端设备所属的PLMN网络的标识为第一预设PLMN网络标识时，核心网设备向终端设备发送第一注册响应消息。S502. 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.
需要指出的是，在该情况下，第一注册响应消息用于指示所述核心网设备支持第一互操作。It should be noted that, in this case, the first registration response message is used to indicate that the core network device supports the first interoperation.
一种可能的实现方式中，第一预设PLMN网络标识为与核心网设备所属运营商的PLMN网络标识不同的标识。In a possible implementation manner, 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.
这样，针对不同运营商的终端设备，AMF向终端设备下发支持第一互操作能力的注册响应消息。可以使终端设备从当前网络移动到归属4G网络时通过第一互操作流程进行移动，从而保持终端设备的业务连续性。In this way, for terminal devices of different operators, the AMF sends a registration response message supporting the first interoperability capability to the terminal devices. When 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.
一种示例，在S502中第一注册响应消息为包括值为第二目标值的第二预设字段。In one example, in S502, the first registration response message includes a second preset field whose value is the second target value.
S503、在终端设备所属的PLMN网络的标识为第二预设PLMN网络标识时，核心网设备向终端设备发送第一注册响应消息。S503. When the identifier of the PLMN network to which the terminal device belongs is the second preset PLMN network identifier, the core network device sends a first registration response message to the terminal device.
需要指出的是，在该情况下，第一注册响应消息用于指示所述核心网设备支持第二互操作。It should be noted that, in this case, the first registration response message is used to indicate that the core network device supports the second interoperation.
一种可能的实现方式中，第二预设PLMN网络标识为与核心网设备所属运营商的PLMN网络标识相同的标识。In a possible implementation manner, 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.
这样，针对同一运营商的终端设备，AMF向终端设备下发支持第二互操作能力的注册响应消息。可以使终端设备从当前网络移动到该同一运营商的4G网络时通过第二互操作流程进行移动，从而保持终端设备的业务连续性。In this way, for the terminal equipment of the same operator, the AMF sends a registration response message supporting the second interoperability capability to the terminal equipment. When 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.
基于此，带来以下有益效果：AMF针对同一PLMN网络的终端设备下发支持第二互操作的第一注册响应消息，针对不同PLMN网络的终端设备下发支持第一互操作的第一注册响应消息。这样，可以只对Iwk_n26字段的不同值的含义进行扩展，而无需对网元信令的具体字段以及AMF的能力进行过多扩展，降低扩展网元的工作量。Based on this, the following beneficial effects are brought: 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. In this way, 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.
以下，对本申请涉及到的第一注册响应消息、第一注册响应消息、第一注册请求消息进行具体说明。Hereinafter, the first registration response message, the first registration response message, and the first registration request message involved in this application will be described in detail.
一、第一注册响应消息。1. The first registration response message.
在本申请中，注册响应消息用于指示核心网设备是否支持第一互操作。In this application, the registration response message is used to indicate whether the core network device supports the first interoperation.
一种可能的实现方式中，结合上述对信令消息扩展部分的介绍，第一注册响应消息中包括取值为第一目标值的第一预设字段；取值为第一目标值的第一预设字段用于指示核心网设备支持第一互操作。In a possible implementation manner, in combination with the above introduction to the extension part of the signaling message, 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.
一种示例，第一目标值的取值为0，第一预设字段为Iwk_n26_inter PLMN字段。In one example, the value of the first target value is 0, and the first preset field is the Iwk_n26_inter PLMN field.
此外，第一注册响应消息中还可以包括取值为第三目标值的第三预设字段；取值为第三目标值的第三预设字段用于指示核心网设备支持第二互操作。In addition, 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.
一种示例，第三目标值的取值为1，第三预设字段为Iwk_n26_intra PLMN字段。An example, the value of the third target value is 1, and the third preset field is the Iwk_n26_intra PLMN field.
该种实现方式可以适用于核心网设备为MME或者核心网设备为AMF等各种场景中。This implementation manner is applicable to various scenarios where the core network device is an MME or the core network device is an AMF.
又一种可能的实现方式中，第一注册响应消息中包括取值为第二目标值的第二预设字段；取值为第二目标值的第二预设字段用于指示核心网设备支持第一互操作。In yet another possible implementation manner, 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.
在终端设备向4G网络发起注册时，第一响应消息为MME向终端设备发送的Attach Accept消息。在终端设备向5G网络发起注册时，第一响应消息为AMF向终端设备发送的Registration Accept消息。When the terminal device initiates registration to the 4G network, the first response message is an Attach Accept message sent by the MME to the terminal device. When the terminal device initiates registration to the 5G network, the first response message is the Registration Accept message sent by the AMF to the terminal device.
一种可能的实现方式中，在所述终端设备所属的PLMN网络的标识为第二预设PLMN网络标识时，第一注册响应消息用于指示核心网设备支持第二互操作。In a possible implementation manner, when the identifier of the PLMN network to which the terminal device belongs is the second preset PLMN network identifier, the first registration response message is used to indicate that the core network device supports the second interoperation.
二、第二注册响应消息。2. The second registration response message.
第二注册响应消息用于指示核心网设备支持第二互操作。The second registration response message is used to indicate that the core network device supports the second interoperation.
一种可能的实现方式中，第二注册响应消息中包括取值为1的Iwk_n26字段；取值为1的Iwk_n26字段用于指示核心网设备支持第二互操作。In a possible implementation manner, 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.
有一种可能的实现方式中，第二注册响应消息中包括取值为1的Iwkn26_intra PLMN字段；取值为1的Iwkn26_intra PLMN字段用于指示核心网设备支持第二互操作。In a possible implementation manner, 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.
在终端设备向4G网络发起注册时，第一响应消息为MME向终端设备发送的Attach Accept消息。在终端设备向5G网络发起注册时，第一响应消息为AMF向终端设备发送的Registration Accept消息。When the terminal device initiates registration to the 4G network, the first response message is an Attach Accept message sent by the MME to the terminal device. When the terminal device initiates registration to the 5G network, the first response message is the Registration Accept message sent by the AMF to the terminal device.
第一注册响应消息和第二注册响应消息的区别在于，两个消息中包括的Iwk_n26字段或者Iwkn26_intra PLMN字段的值不同。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.
需要指出的是，在本申请中，第一注册响应消息和第二注册响应消息可以是承载在同一注册响应消息中的消息(例如统称为第一注册响应消息)，针对不同PLMN网络的终端，该注册响应消息指示不同的含义。例如，在终端设备与核心网设备归属于不同PLMN网络时(或者终端设备所属的PLMN网络的标识为第一预设PLMN网络标识)，第一注册响应消息用于指示核心网设备支持第一互操作。在终端设备与核心网设备归属于同一PLMN网络时(或者终端设备所属的PLMN网络的标识为第二预设PLMN网络标识)，第一注册响应消息用于指示核心网设备支持第二互操作。本申请对此不在赘述。It should be pointed out that in this application, 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. When the terminal device and the core network device belong to the same PLMN network (or the identifier of the PLMN network to which the terminal device belongs is the second preset PLMN network identifier), 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.
三、第一注册请求消息。3. The first registration request message.
第一注册请求消息用于指示终端设备支持第一互操作。The first registration request message is used to indicate that the terminal device supports the first interoperation.
一种可能的实现方式中，第一注册请求消息中包括取值为第五目标值的第四预设字段；取值为第五目标值的第四预设字段用于指示终端设备支持第一互操作。In a possible implementation manner, 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.
一种示例，第五目标值的取值为1，第四预设字段为HO_attach_inter PLMN字段。An example, the value of the fifth target value is 1, and the fourth preset field is the HO_attach_inter PLMN field.
此外，第一注册请求消息还用于指示终端设备支持第二互操作。In addition, the first registration request message is also used to indicate that the terminal device supports the second interoperation.
一种可能的实现方式中，第一注册请求消息中还包括取值为第六目标值的第五预设字段；取值为第六目标值的第五预设字段用于指示终端设备支持第二互操作。In a possible implementation manner, 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.
一种示例，第六目标值的取值为1，第五预设字段为HO_attach_intra PLMN字段。An example, the value of the sixth target value is 1, and the fifth preset field is the HO_attach_intra PLMN field.
若核心网设备为归属网络中的MME，则第一注册请求消息中还包括取值为第七目标值的第六预设字段，取值为第七目标值的第六预设字段用于指示终端设备支持5G网络的N1接口；此时第一注册请求消息为终端设备向MME发送Attach Request消息。If the core network device is an MME in the home network, 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.
一种示例，第七目标值的取值为1，第六预设字段为N1_mode字段。In one example, the value of the seventh target value is 1, and the sixth preset field is the N1_mode field.
若核心网设备为漫游网络中的AMF则第一注册请求消息中还包括取值为第八目标值的第七预设字段，取值为第八目标值的第七预设字段用于指示终端设备支持4G网络的S1接口。此时第一注册请求消息为终端设备向AMF发送的Registration Request消息。If the core network device is an AMF in a roaming network, 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. At this time, the first registration request message is a Registration Request message sent by the terminal device to the AMF.
一种示例，第八目标值的取值为1，第七预设字段为S1_mode字段。In one example, the value of the eighth target value is 1, and the seventh preset field is the S1_mode field.
以上，对本申请涉及到的第一注册响应消息、第一注册响应消息、第一注册请求消息进行了具体说明。Above, the first registration response message, the first registration response message, and the first registration request message involved in this application have been specifically described.
以下，对本申请涉及到的第一互操作流程进行说明：The following describes the first interoperability process involved in this application:
本申请提供的第一互操作流程至少包括以下场景1和场景2。分别为：场景1、终端设备从漫游5G网络移动到归属4G网络；场景2、终端设备从归属4G网络移动到漫游5G网络。下面分别对场景1和场景2进行详细说明。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.
场景1、终端设备从漫游5G网络移动到归属4G网络。 Scenario 1. The terminal device moves from the roaming 5G network to the home 4G network.
在场景1中、第一互操作流程可以通过如图6所示的S601-S604实现。In Scenario 1, the first interoperability process may be implemented through S601-S604 as shown in FIG. 6 .
S601、终端设备向MME发送附着请求消息。相应的，MME接收来自终端设备的附着请求消息。S601. The terminal device sends an attach request message to the MME. Correspondingly, the MME receives the attach request message from the terminal device.
其中，附着请求消息为终端设备从漫游5G网络移动到归属4G网络之后生成的附着请求消息；附着请求消息中包括PDN连接请求消息，PDN连接请求消息的请求类型为切换；漫游5G网络和归属4G网络之间未配置互操作接口。Among them, 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.
也即是说，附着请求消息中包括PDN连接请求消息，PDN连接请求消息的请求类型设置为“切换(handover)”或者“紧急承载服务切换(handover of emergency bearer services)”，用于把PDU会话从N1接口传输到S1接口。That is to say, the attach request message includes a PDN connection request message, and 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.
一种可能的实现方式中，附着请求消息还包括以下参数中的至少一项：DNN或APN、PDU Session ID in PCO。In a possible implementation manner, the attach request message further includes at least one of the following parameters: DNN or APN, PDU Session ID in PCO.
S602、核心网设备向归属签约用户服务器(Home Subscriber Server，HSS)+统一数据管理功能(Unified Data Management，UDM)发送位置更新请求消息。相应的，HSS+UDM接收来自终端设备的位置更新请求消息。S602. 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). Correspondingly, the HSS+UDM receives the location update request message from the terminal device.
位置更新请求消息为指示HSS+UDM不向old AMF发起取消登记流程的位置更新请求消息；old AMF为第二PLMN网络中的AMF。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.
S603、HSS+UDM向核心网设备发送位置更新响应消息。相应的，核心网设备接收来自HSS+UDM的位置更新响应消息。S603. The HSS+UDM sends a location update response message to the core network device. Correspondingly, the core network device receives the location update response message from the HSS+UDM.
位置更新响应消息中包括与第一PDU会话对应的网关控制面(PDN Gateway Controlplane function，PGWC)+会话管理功能(Session Management Function，AMF)全称域名(Fully Qualified Domain Name，FQDN)。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.
S604、核心网设备根据PGWC+SMF FQDN发起PDU创建会话流程。S604. The core network device initiates a PDU creation session process according to the PGWC+SMF FQDN.
该PDU会话创建流程用于在第一PLMN网络中建立第二PDU会话，并关联第一PDU会话和第二PDU会话。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.
上述方案至少带来以下有益效果，在终端设备从漫游5G网络移动到归属4G网络，终端设备生成附着请求消息，附着请求消息中包括请求类型为切换的PDN连接请求。基于该附着请求消息，MME能够从HSS+UDM中获取终端设备得第一PDU会话对应的PGWC+SMF FQDN，进而使得MME能够根据第一PDU会话对应的PGWC+SMF FQDN将第一PDU会话关联到归属4G网络中，完成对第一PDU会话迁移，保证了终端设备的业务连续性。The above solution brings at least the following beneficial effects. When 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.
如图7所示，一种具体的实现方式中，终端设备从漫游5G网络移动到归属4G网络的情况下，基于无N26接口的跨PLMN互操作流程包括以下S701-S717。As shown in FIG. 7 , in a specific implementation manner, when the terminal device moves from the roaming 5G network to the home 4G network, the cross-PLMN interoperability process based on the non-N26 interface includes the following S701-S717.
S701、终端设备向接入网设备发送TAU请求消息。相应的，接入网设备接收来自终端设备的TAU请求消息。S701. The terminal device sends a TAU request message to the access network device. Correspondingly, the access network device receives the TAU request message from the terminal device.
其中，在图7相关流程中，接入网设备指的是归属4G网络中的接入网设备，例 如eNodeB。Wherein, in the relevant process in FIG. 7, the access network device refers to the access network device in the home 4G network, such as eNodeB.
TAU请求消息中包括从终端设备在漫游5G网络中的5G-GUTI中映射得到的4G-GUTI。The TAU request message includes the 4G-GUTI mapped from the 5G-GUTI of the terminal device roaming in the 5G network.
S702、接入网设备向MME发送TAU请求消息。相应的，MME接收来自接入网设备的TAU请求消息。S702. The access network device sends a TAU request message to the MME. Correspondingly, the MME receives the TAU request message from the access network device.
S703、MME向终端设备发送TAU拒绝消息。相应的，终端设备接收来自MME的TAU拒绝消息。S703. The MME sends a TAU rejection message to the terminal device. Correspondingly, the terminal device receives the TAU rejection message from the MME.
一种可能的实现方式中，TAU拒绝消息为TAU Reject消息。TAU Reject消息中携带有EMM Cause(#9网络无法获取UE标识)等信息。In a possible implementation manner, 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).
具体来说，MME接收到来自终端设备的TAU请求消息之后，根据TAU请求消息中的4G-GUTI确定MME无法获取终端设备的MM上下文信息，此时MME向终端设备发送TAU Reject消息。Specifically, 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.
一种可能的实现方式中，MME通过接入网设备向终端设备发送TAU拒绝消息。In a possible implementation manner, the MME sends a TAU rejection message to the terminal device through the access network device.
需要指出的是，在5G核心网漫游场景中，漫游到漫游5G网络的终端设备需要保持会话连续性(即IP连续性)，并且终端设备在漫游5G注册的时候向漫游网络的接入网设备和核心网设备发送的Registration Request中携带的5GMM Capability字段中，将HO_attach设置为1。漫游网络的核心网设备在向终端设备回复Registration Accept消息携带的5GS network feature support字段中指示核心网设备支持第一互操作。此时，终端设备在从漫游5G网络移动到归属4G网络之后，终端设备可以执行上述S701-S703中的步骤。It should be pointed out that in the 5G core network roaming scenario, 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. At this time, after the terminal device moves from the roaming 5G network to the home 4G network, the terminal device may perform the above steps in S701-S703.
S704、终端设备接入网设备发送附着请求消息。相应的，接入网设备接收来自终端设备的附着请求消息。S704. The terminal device access network device sends an attach request message. Correspondingly, the access network device receives the attach request message from the terminal device.
S705、接入网设备向MME发送附着请求消息。相应的，MME接收来自终端设备的附着请求消息。S705. The access network device sends an attach request message to the MME. Correspondingly, the MME receives the attach request message from the terminal device.
其中，S704和S705的具体实现方式可以参照上述S601，此处不再赘述。Wherein, for specific implementation manners of S704 and S705, reference may be made to the above S601, which will not be repeated here.
S706、MME根据附着请求消息对终端设备进行安全认证过程。S706. The MME performs a security authentication process on the terminal device according to the attach request message.
可选的，MME还可以对终端设备进行Equipment ID检查。Optionally, the MME can also check the Equipment ID of the terminal equipment.
S707、MME向HSS+UDM发送位置区更新请求消息。相应的，HSS+UDM接收来自MME的位置区更新请求消息。S707. The MME sends a location area update request message to the HSS+UDM. Correspondingly, the HSS+UDM receives the location area update request message from the MME.
一种可能的实现方式中，位置区更新请求消息为Location Update Request消息。In a possible implementation manner, the location area update request message is a Location Update Request message.
区别于现有技术的是，在本申请实施例的Location Update Request消息中不包括initial attach指示位。因此，HSS+UDM不会向old AMF发起取消登记流程。The difference from the prior art is that 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.
S708、HSS+UDM向MME返回位置区更新响应消息。相应的，MME接收来自HSS+UDM的位置区更新响应消息。S708. The HSS+UDM returns a location area update response message to the MME. Correspondingly, the MME receives the location area update response message from the HSS+UDM.
其中，该位置区更新响应消息中包括终端设备的用于签约信息，以及终端设备对应的PGWC+SMF FQDN。Wherein, the location area update response message includes the subscription information of the terminal device and the corresponding PGWC+SMF FQDN of the terminal device.
需要指出的是，在终端设备处于连接态的情况下，终端设备在漫游5G网络中建立PDU会话时，会将选择的PGWC+SMF FQDN通知给HSS+UDM。It should be pointed out that 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.
需要指出的是，基于S707和S708，由于漫游5G网络和归属4G网络之间无N26 接口，因此，归属4G网络的MME无法直接从漫游5G网络的AMF中获取终端设备的上下文信息(也即，无法获得终端设备在漫游5G网络中建立PDU会话时选择的PGWC+SMF的IP地址或者FQDN)。因此，通过步骤S707和S708，MME可以从HSS+UDM中获得终端设备的PGWC+SMF FQDN，进而使得MME可以将终端设备在漫游5G网络中建立的PDU会话迁移到归属4G网络中，以保持终端设备业务的IP地址的连续性，和业务的连续性。It should be pointed out that based on S707 and S708, since there is no N26 interface between the roaming 5G network and the home 4G network, 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). Therefore, through steps S707 and S708, 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.
若按照现有技术执行，在S707中，HSS+UDM会向old AMF发起取消登记流程，使得终端设备在漫游5G中建立的PDU会话被删除，进而导致无法将终端设备在漫游5G中建立的PDU会话迁移到归属4G网络中。If it is implemented according to the existing technology, in S707, 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.
S709、MME确定P-GW和S-GW，在此之后，完成将终端设备在漫游5G网络中的PDU会话迁移到归属4G网络的过程。S709. 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.
MME完成向P-GW和S-GW创建会话的过程。在此之后，PGW-C+SMF根据创建的会话的PDU Session ID in PCO关联终端设备在漫游5G网络中的PDU会话的5G PDU Session。The MME completes the process of creating sessions with the P-GW and the S-GW. After that, 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.
在PDU会话关联完成之后，MME向接入网设备发送初始上下文建立请求(Initial Context Setup Request)消息。该消息中也可以包括附着响应消息。如果终端设备在发送的附着请求中标识终端设备支持5GC NAS，则该附着响应消息中包括MME支持无N26接口的跨PLMN互操作流程的指示。这样，终端设备如果终端设备后续又从归属4G网络移动到漫游5G网络，则终端设备可以根据该指示执行从归属4G到漫游5G的无N26接口的跨PLMN互操作流程。其中，该过程可以参照现有技术，本申请对此不做限定。After the PDU session association is completed, 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.
需要指出的是，以上S704-S709用于将终端设备在漫游5G网络中的IMS会话迁移到归属4G网络中。It should be pointed out that the above S704-S709 are used to migrate the IMS session of the terminal device in the roaming 5G network to the home 4G network.
S710、核心网设备向接入网设备发送初始上下文建立请求和附着响应消息。相应的，接入网设备接收来自核心网设备的初始上下文建立请求和附着响应消息。S710. The core network device sends an initial context establishment request and an attach response message to the access network device. Correspondingly, the access network device receives the initial context establishment request and the attach response message from the core network device.
附着响应消息用于指示核心网设备支持第一互操作。The attach response message is used to indicate that the core network device supports the first interoperation.
S711、接入网设备向终端设备发送RRC连接重配置消息和附着响应消息。S711. The access network device sends an RRC connection reconfiguration message and an attach response message to the terminal device.
S712、接入网设备向核心网设备发送初始上下文建立响应消息。相应的，核心网设备接收来自接入网设备的初始上下文建立响应消息。S712. The access network device sends an initial context establishment response message to the core network device. Correspondingly, the core network device receives the initial context establishment response message from the access network device.
S713、终端设备向和核心网设备发送附着完成消息。相应的，核心网设备接收来自终端设备的附着完成消息。S713. The terminal device sends an attach complete message to the core network device. Correspondingly, the core network device receives the attachment completion message from the terminal device.
S714、MME向HSS+UDM发送通知请求消息。相应的，HSS+UDM接收来自MME的通知请求。S714. The MME sends a notification request message to the HSS+UDM. Correspondingly, the HSS+UDM receives the notification request from the MME.
一种可能的实现方式中，该通知请求为Notify Request消息。Notify Request消息中至少包括：APN/DNN和PGW-C+SMF FQDN。In a possible implementation manner, the notification request is a Notify Request message. The Notify Request message includes at least: APN/DNN and PGW-C+SMF FQDN.
需要指出的是，如果在上述S704-S709的附着过程中，建立的PDU会话包括请求类型为切换以外的PDN连接，也即包括Request type不是"Handover"的PDN连接，且MME确定自身支持第一互操作流程，则终端设备向HSS+UDM发送通知请求。It should be pointed out that if, during the attachment process of S704-S709 above, the established PDU session includes a PDN connection whose request type is other than handover, that is, a PDN connection whose Request type is not "Handover", and the MME determines that it supports the first In the interoperability process, the terminal device sends a notification request to HSS+UDM.
S715、HSS+UDM向MME发送通知响应消息。S715. The HSS+UDM sends a notification response message to the MME.
一种可能的实现方式中，通知响应消息为Notify Response消息。In a possible implementation manner, the notification response message is a Notify Response message.
S716、终端设备发起请求PDN连接流程。S716. The terminal device initiates a process of requesting a PDN connection.
其中，请求PDN连接流程的请求类型为切换(handover)。Wherein, the request type for requesting the PDN connection process is handover.
在请求PDN连接流程中，将终端设备在漫游5G网络中除IMS会话以外的会话也迁移到归属4G网络中。In the process of requesting a PDN connection, the sessions other than the IMS session of the terminal device in the roaming 5G network are also migrated to the home 4G network.
需要指出的是，在S715之后，若终端设备在漫游5G网络中还存在IMS会话以外的会话(例如数据会话)，则终端设备发起S716中所记载的请求PDN连接流程。若终端设备在漫游5G网络中不存在IMS会话以外的会话，则终端设备不发起S716中所记载的请求PDN连接流程。It should be pointed out that after S715, if the terminal device still has a session other than the IMS session (such as a data session) in the roaming 5G 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.
S717、SMF+PGW-C指示漫游5G网络的核心网释放迁移完成的PDU会话。S717. SMF+PGW-C instructs the core network of the roaming 5G network to release the PDU session whose migration is completed.
一种可能的实现方式中，SMF+PGW-C确定终端设备已经迁移完成的PDU会话，并指示漫游5G网络的核心网释放这些迁移完成的PDU会话。In a possible implementation, 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.
以上，对场景1中终端设备从漫游5G网络移动到归属4G网络时，终端设备的进行的第一互操作流程进行说明。Above, the first interoperation process performed by the terminal device when the terminal device moves from the roaming 5G network to the home 4G network in scenario 1 is described.
以下，对场景2中终端设备从归属4G网络移动到漫游5G网络时，终端设备的进行的互操作流程进行说明。In the following, when the terminal device moves from the home 4G network to the roaming 5G network in Scenario 2, the interoperation process performed by the terminal device will be described.
场景2、终端设备从归属4G网络移动到漫游5G网络。 Scenario 2. The terminal device moves from the home 4G network to the roaming 5G network.
在场景2中、第一互操作流程可以通过如图8所示的S801-S805实现。In Scenario 2, the first interoperability process may be implemented through S801-S805 as shown in FIG. 8 .
S801、终端设备向核心网设备发送第二注册请求消息。相应的，核心网设备接收来自终端设备的第二注册请求消息。S801. The terminal device sends a second registration request message to the core network device. Correspondingly, the core network device receives the second registration request message from the terminal device.
第二注册请求为终端设备从归属4G网络移动到漫游5G网络之后生成的注册请求；第二注册请求消息的注册类型为移动性注册更新；漫游5G网络和归属4G网络之间未配置互操作接口；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 ;
S802、核心网设备向HSS+UDM发送UDM注册请求。相应的，HSS+UDM接收来自终端设备的UDM注册请求。S802. The core network device sends a UDM registration request to the HSS+UDM. Correspondingly, the HSS+UDM receives the UDM registration request from the terminal device.
UDM注册请求用于指示HSS+UDM不进行位置删除操作；The UDM registration request is used to instruct HSS+UDM not to delete the location;
S803、HSS+UDM向核心网设备发送终端设备的签约数据。相应的，核心网设备接收来自HSS+UDM的终端设备的签约数据。S803. The HSS+UDM sends the subscription data of the terminal device to the core network device. Correspondingly, the core network equipment receives the subscription data from the HSS+UDM terminal equipment.
签约数据包括以下至少一项：DNN或APN，以及第三PDU连接的SMF+PGW-C FQDN；The subscription data includes at least one of the following: DNN or APN, and the SMF+PGW-C FQDN of the third PDU connection;
S804、核心网设备根据DNN或APN和第三PDU连接的SMF+PGW-C FQDN，发起第四PDU会话建立流程。S804. 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.
第四PDU会话建立流程用于在第二PLMN网络中建立第四PDU会话，并关联第三PDU会话和第四PDU会话。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.
S805、核心网设备向终端设备发送第三注册接受消息。相应的，终端设备接收来自核心网设备的第三注册接受消息。S805. The core network device sends a third registration acceptance message to the terminal device. Correspondingly, the terminal device receives the third registration acceptance message from the core network device.
第三注册接受消息用于表示核心网设备支持第一互操作。The third registration acceptance message is used to indicate that the core network device supports the first interoperation.
上述方案至少带来以下有益效果，在终端设备从归属4G网络移动到漫游5G网络， 终端设备生成第二注册请求消息，第二注册请求消息的注册类型为移动性注册更新。基于该第二注册请求消息，AMF能够从HSS+UDM中获取第三PDU连接的SMF+PGW-C FQDN。进而使得AMF能够根据第三PDU会话对应的PGWC+SMF FQDN将第三PDU会话关联到漫游5G网络中，完成对第三PDU会话迁移，保证了终端设备的业务连续性。The above solution brings at least the following beneficial effects. When 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.
如图9所示，一种具体的实现方式中，从归属4G网络移动到漫游5G网络的情况下，第一互操作流程包括以下S901-S915。As shown in FIG. 9 , in a specific implementation manner, in the case of moving from the home 4G network to the roaming 5G network, the first interoperation process includes the following S901-S915.
S901、终端设备向接入网设备发送注册请求消息。S901. The terminal device sends a registration request message to the access network device.
一种可能的实现方式中，注册请求为：registration request。其中，注册请求的注册类型为移动性注册更新“mobility registration update”。注册请求消息中包括以下至少一项：从终端设备在归属4G网络中的4G-GUTI中映射得到的5G-GUTI，至少一个请求的S-NSSAIs、终端设备关联的已经建立的PDN连接和映射后的PDU会话ID。In a possible implementation manner, the registration request is: registration request. Wherein, 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.
S902、接入网设备执行AMF选择。S902. The access network device performs AMF selection.
S903、接入网设备向AMF发送注册请求。相应的，AMF接收来自接入网设备的注册请求。S903. The access network device sends a registration request to the AMF. Correspondingly, the AMF receives the registration request from the access network device.
其中，该AMF为接入网设备进行AMF选择后确定的AMF。由于该AMF为终端设备的漫游网络的中的AMF，因此该AMF也称为vAMF。Wherein, 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.
S904、AMF对终端设备进行安全认证。S904. The AMF performs security authentication on the terminal device.
可选的，AMF检查终端设备的Equipment ID。Optionally, AMF checks the Equipment ID of the terminal equipment.
需要指出的是，由于该AMF为支持第一互操作流程的AMF。因此，在AMF接收到该终端设备，并确定该终端设备为从归属4G网络移动到该PLMN网络的终端设备之后，AMF确定需要将终端设备在归属4G网络的的PDU会话迁移到漫游5G网络中，则AMF不执行现有技术中对终端设备的PDU会话状态进行同步(PDU Session status synchronization)的过程，以及忽略向old MME获取终端设备上下文的过程。It should be pointed out that since 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.
S905、AMF向HSS+UDM发起UDM注册请求。相应的，HSS+UDM接收来自AMF的UDM注册请求。S905. The AMF initiates a UDM registration request to the HSS+UDM. Correspondingly, the HSS+UDM receives the UDM registration request from the AMF.
一种可能的实现方式中，UDM注册请求为：Nudm_UECM_Registration Request。UDM注册请求用于指示此次注册时从MME发起的注册。In a possible implementation, 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.
需要指出的是，现有的AMF向HSS+UDM发起UDM注册请求之后，HSS+UDM发起位置删除操作，将终端设备的位置信息删除，这将使得终端设备不能维持到EPC的注册状态。当可达定时器超时之后，MME会隐式注销终端设备，同时释放到终端设备保留的PDN连接，导致无法将终端设备在归属4G网络的PDN连接迁移到漫游5G中。It should be pointed out that after the existing AMF initiates a UDM registration request to the HSS+UDM, 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. When the reachable timer expires, 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.
因此，本申请在UDM注册请求中增加用于指示此次注册时从MME发起的注册的信息，可以使得HSS+UDM不向归属4G网络的old MME发起位置删除操作，进而使得漫游5G网络的核心网可以将终端设备在归属4G网络的PDN连接迁移到漫游5G中。Therefore, 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.
S906、HSS+UDM向AMF发送终端设备的签约数据。S906. The HSS+UDM sends the subscription data of the terminal device to the AMF.
其中，请求的签约数据包括以下至少一项：DNN或APN，以及终端设备在归属 4G中建立的每个PDU连接的SMF+PGW-C FQDN。Wherein, 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.
需要指出的是，由于归属4G网络与漫游5G网络之间无N26接口，导致AMF无法从MME获得终端设备的上下文，因此AMF需要从HSS+UDM中获取终端设备在归属4G中建立的每个PDU连接的SMF+PGW-C FQDN，进而根据SMF+PGW-C FQDN将PDN连接迁移到漫游5G网络中，保持PDU会话IP地址连续性和业务连续性。It should be pointed out that 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.
S907、AMF选择PCF，并发起AM策略关联流程。S907. The AMF selects the PCF, and initiates an AM policy association process.
其中，S907的具体实现可以参照现有技术，本申请对此不在赘述。Wherein, the specific implementation of S907 may refer to the prior art, and this application will not describe it in detail.
S908、AMF向终端设备发送注册响应消息。S908. The AMF sends a registration response message to the terminal device.
一种可能的实现方式中，注册响应消息为：Registration Accept消息。In a possible implementation manner, the registration response message is: Registration Accept message.
关于该步骤中的Registration Accept消息可以参照前述对Registration Accept消息的介绍进行理解，此处不再赘述。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.
S909、终端设备向AMF发送注册完成消息。相应的，AMF接收来自终端设备的注册完成消息。S909. The terminal device sends a registration completion message to the AMF. Correspondingly, the AMF receives the registration completion message from the terminal device.
一种可能的实现方式中，注册完成消息为：Registration Complete消息。注册完成消息用于指示注册完成。In a possible implementation manner, the registration completion message is: Registration Complete message. The registration complete message is used to indicate that the registration is complete.
S910、终端设备向AMF发起PDU会话建立请求。相应的，AMF接收来自终端设备的PDU会话建立请求。S910. The terminal device initiates a PDU session establishment request to the AMF. Correspondingly, the AMF receives the PDU session establishment request from the terminal device.
其中，PDU会话建立请求的请求类型为已经存在的PDU会话。也即是说，PDU会话建立请求的Request Type为Existing PDU Session。PDU会话建立请求中包括PDU会话标识(PDU Session ID)和S-NSSAI。PDU Session ID和S-NSSAI与已经存在的PDU会话相对应。Wherein, 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.
S911、AMF根据从终端设备获得的DNN，以及从HSS+UDM获取的SMF+PGW-C FQDN，通过NRF和SEEP获取SMF+PGW-C ID的IP地址或FQDN。S911. 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.
S912、AMF选择vSMF。S912. The AMF selects the vSMF.
S913、AMF发起到vSMF和SMF+PGW-C的PDU会话建立过程。S913. The AMF initiates a PDU session establishment process to the vSMF and the SMF+PGW-C.
具体来说，AMF向vAMF发送Nsmf_PDUSession_CreateSMContext service消息。该消息中包括PDU Session ID和SMF+PGW-C的FQDN。vSMF将消息转发给SMF+PGW-C。Specifically, 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根据PDU Session ID确定相应的PDU会话，同时将终端设备的用户面从归属4G网络迁移到漫游5G网络中，建立终端设备的PDU会话。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.
S914、PGW-C+SMF根据PDU Session ID将终端设备在归属4G网络中的PDU会话关联到在漫游5G网络建立的PDU会话中。S914. 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.
S915、SMF+PGW-C指示归属4G网络的核心网释放终端设备的PDN连接以及承载资源。S915, SMF+PGW-C instructs the core network of the home 4G network to release the PDN connection and bearer resources of the terminal device.
一种可能的实现方式中，SMF+PGW-C确定终端设备已经迁移完成的PDN连接，并指示归属4G网络的核心网释放这些迁移完成的PDN连接以及承载资源。In a possible implementation, 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.
可以看出，上述主要从方法的角度对本申请实施例提供的技术方案进行了介绍。为了实现上述功能，其包含了执行各个功能相应的硬件结构和/或软件模块。本领域技 术人员应该很容易意识到，结合本文中所公开的实施例描述的各示例的模块及算法步骤，本申请实施例能够以硬件或硬件和计算机软件的结合形式来实现。某个功能究竟以硬件还是计算机软件驱动硬件的方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本发明的范围。It can be seen that the foregoing mainly introduces the technical solutions provided by the embodiments of the present application from the perspective of methods. In order to realize the above functions, it includes corresponding hardware structures and/or software modules for performing various functions. Those skilled in the art should easily realize that, in combination with the modules and algorithm steps of the examples described in the embodiments disclosed herein, the embodiments of the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed by hardware or computer software drives hardware depends on the specific application and design constraints of the technical solution. Skilled artisans may use different methods to implement the described functions for each specific application, but such implementation should not be regarded as exceeding the scope of the present invention.
本申请实施例可以根据上述方法示例对通信装置进行功能模块的划分，例如，可以对应各个功能划分各个功能模块，也可以将两个或两个以上的功能集成在一个处理模块中。上述集成的模块既可以采用硬件的形式实现，也可以采用软件功能模块的形式实现。可选的，本申请实施例中对模块的划分是示意性的，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式。In the embodiment of the present application, the functional modules of the communication device may be divided according to the above method example. For 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. Optionally, 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.
如图10所示，为本申请实施例提供的一种接入网设备的结构示意图。该接入网设备包括：通信单元1001和处理单元1002。As shown in 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 .
处理单元1002，用于指示通信单元1001接收来自终端设备的第一注册请求消息；响应于第一注册请求消息，处理单元1002，还用于指示通信单元1001向终端设备发送第一注册响应消息；第一注册响应消息用于指示核心网设备支持第一互操作；第一互操作用于保证终端设备在未配置互操作接口的PLMN网络之间移动时的业务连续性。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.
可选的，在所述核心网设备和所述终端设备归属于同一运营商的情况下，第一注册响应消息中包括取值为第一目标值的第一预设字段；取值为第一目标值的第一预设字段用于指示核心网设备支持第一互操作。Optionally, when the core network device and the terminal device belong to the same operator, 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.
可选的，在所述核心网设备和所述终端设备归属于不同运营商的情况下，第一注册响应消息中包括取值为第二目标值的第二预设字段；取值为第二目标值的第二预设字段用于指示核心网设备支持第一互操作。Optionally, when the core network device and the terminal device belong to different operators, 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.
可选的，第一注册响应消息，还用于指示核心网设备支持第二互操作；第二互操作用于保证终端设备在配置有互操作接口的同一PLMN网络内切换时的业务连续性。Optionally, 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.
可选的，第一注册响应消息中还包括取值为第三目标值的第三预设字段；取值为第三目标值的第三预设字段用于指示核心网设备支持第二互操作。Optionally, 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 .
可选的，处理单元1002，还用于：确定终端设备所属的PLMN网络的标识；在终端设备所属的PLMN网络的标识为第一预设PLMN网络标识时，指示通信单元1001向终端设备发送第一注册响应消息。Optionally, 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.
可选的，在所述终端设备所属的PLMN网络的标识为第二预设PLMN网络标识时，所述第一注册响应消息用于指示所述核心网设备支持第二互操作。Optionally, when the identifier of the PLMN network to which the terminal device belongs is the second preset PLMN network identifier, the first registration response message is used to indicate that the core network device supports the second interoperation.
可选的，第一注册响应消息中包括取值为第四目标值的第二预设字段；取值为第四目标值的第二预设字段用于指示核心网设备支持第二互操作。Optionally, 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.
可选的，第一注册响应消息中包括取值为第三目标值的第三预设字段；取值为第三目标值的第三预设字段用于指示核心网设备支持第二互操作。Optionally, 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.
可选的，第一注册请求消息用于指示终端设备支持第一互操作。Optionally, the first registration request message is used to indicate that the terminal device supports the first interoperation.
可选的，第一注册请求消息中包括取值为第五目标值的第四预设字段；取值为第五目标值的第四预设字段用于指示终端设备支持第一互操作。Optionally, 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.
可选的，第一注册请求消息还用于指示终端设备支持第二互操作。Optionally, the first registration request message is also used to indicate that the terminal device supports the second interoperation.
可选的，第一注册请求消息中还包括取值为第六目标值的第五预设字段；取值为第六目标值的第五预设字段用于指示终端设备支持第二互操作。Optionally, 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.
可选的，核心网设备为归属网络中的MME，或者核心网设备为漫游网络中的AMF。Optionally, the core network device is the MME in the home network, or the core network device is the AMF in the roaming network.
可选的，若核心网设备为归属4G网络中的MME，则第一注册请求消息中还包括取值为第七目标值的第六预设字段，取值为第七目标值的第六预设字段用于指示终端设备支持5G网络的N1接口；若核心网设备为漫游5G网络中的AMF，则第一注册请求消息中还包括取值为第八目标值的第七预设字段，取值为第八目标值的第七预设字段用于指示终端设备支持4G网络的S1接口。Optionally, if the core network device is an MME in the home 4G 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.
可选的，若核心网设备为归属4G网络中的MME，则第一注册请求消息为终端设备向核心网设备发送的Attach Request消息，第一注册响应消息为核心网设备向终端设备发送的Attach Accept消息；若核心网设备为漫游5G网络中的AMF，则第一注册请求消息为终端设备向核心网设备发送的Registration Request消息，第一注册响应消息为核心网设备向终端设备发送的Registration Accept消息。Optionally, if the core network device is an MME in the home 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 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.
可选的，核心网设备为归属4G网络中的MME；处理单元1002，还用于：指示通信单元1001接收来自终端设备的附着请求消息；其中，附着请求消息为终端设备从漫游5G网络移动到归属4G网络之后生成的附着请求消息；附着请求消息中包括PDN连接请求消息，PDN连接请求消息的请求类型为切换；漫游5G网络和归属4G网络之间未配置互操作接口；响应于附着请求消息，指示通信单元1001向HSS+UDM发送位置更新请求消息；位置更新请求消息为指示HSS+UDM不向old AMF发起取消登记流程的位置更新请求消息；old AMF为第二PLMN网络中的AMF；指示通信单元1001接收来自HSS+UDM的位置更新响应消息；位置更新响应消息中包括与第一PDU会话对应的PGWC+SMF FQDN；根据PGWC+SMF FQDN发起PDU创建会话流程；该PDU会话创建流程用于在第一PLMN网络中建立第二PDU会话，并关联第一PDU会话和第二PDU会话。Optionally, 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; initiates the PDU session creation process according to the PGWC+SMF FQDN; the PDU session creation process is used for Establish a second PDU session in the first PLMN network, and associate the first PDU session with the second PDU session.
可选的，处理单元1002，还用于：指示通信单元1001向接入网设备发送初始上下文建立请求和附着响应消息；指示通信单元1001接收来自接入网设备的初始上下文建立响应消息，以及来自终端设备的附着完成消息。Optionally, 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.
可选的，附着响应消息用于指示核心网设备支持第一互操作。Optionally, the attach response message is used to indicate that the core network device supports the first interoperation.
可选的，处理单元1002，还用于：指示通信单元1001接收来自终端设备的TAU请求消息；TAU消息中包括第一GUTI；第一GUTI为从终端设备在漫游5G网络中的GUTI映射得到的GUTI；根据第一GUTI确定无法获取终端设备的上下文；指示通信单元1001向终端设备发送TAU拒绝消息。Optionally, 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.
可选的，核心网设备为漫游5G网络中的AMF，处理单元1002，还用于：指示通信单元1001接收来自终端设备的第二注册请求消息；第二注册请求为终端设备从归属4G网络移动到漫游5G网络之后生成的注册请求；第二注册请求消息的注册类型为移动性注册更新；漫游5G网络和归属4G网络之间未配置互操作接口；响应于注册请求消息，指示通信单元1001向HSS+UDM发送UDM注册请求，UDM注册请求用于指示HSS+UDM不进行位置删除操作；指示通信单元1001接收来自HSS+UDM的终端设备的签约数据；签约数据包括以下至少一项：DNN或APN，以及第三PDU连接的 SMF+PGW-C FQDN；根据DNN或APN和第三PDU连接的SMF+PGW-C FQDN，发起第四PDU会话建立流程；第四PDU会话建立流程用于在第二PLMN网络中建立第四PDU会话，并关联第三PDU会话和第四PDU会话。Optionally, the core network device is an AMF in a roaming 5G network, and 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 session establishment process; the fourth PDU session establishment process is used in the second A fourth PDU session is established in the PLMN network, and the third PDU session is associated with the fourth PDU session.
可选的，处理单元1002，还用于：指示通信单元1001向终端设备发送第三注册接受消息；第三注册接受消息用于表示核心网设备支持第一互操作。Optionally, 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.
可选的，该接入网设备还可以包括存储模块，用于存储接入网设备的程序代码和/或数据。Optionally, the access network device may further include a storage module, configured to store program codes and/or data of the access network device.
其中，处理单元1002可以是处理器或控制器。其可以实现或执行结合本申请公开内容所描述的各种示例性的逻辑方框，模块和电路。处理器也可以是实现计算功能的组合，例如包括一个或多个微处理器组合，DSP和微处理器的组合等等。通信单元1001可以是收发电路或通信接口等。存储模块可以是存储器。当处理单元1002为处理器，通信单元1001为通信接口，存储模块为存储器时，本申请实施例所涉及的接入网设备可以为图1所示接入网设备。Wherein, 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. When the processing unit 1002 is a processor, the communication unit 1001 is a communication interface, and the storage module is a memory, the access network device involved in this embodiment of the present application may be the access network device shown in FIG. 1 .
如图11所示，为本申请实施例提供的一种终端设备的结构示意图。该终端设备包括：通信单元1101和处理单元1102。As shown in 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 .
处理单元1102，用于指示通信单元1101向核心网设备发送第一注册请求消息；处理单元1102，还用于指示通信单元1101接收来自核心网设备的第一注册响应消息；第一注册响应消息用于指示核心网设备支持第一互操作；第一互操作用于保证终端设备在未配置互操作接口的PLMN网络之间移动时的业务连续性。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.
可选的，第一注册请求消息用于表示终端设备支持第一互操作。Optionally, the first registration request message is used to indicate that the terminal device supports the first interoperation.
可选的，核心网设备为归属4G网络中的MME，处理单元1102，还用于：在终端设备从漫游5G网络移动到归属4G网络之后，生成附着请求消息；附着请求消息中包括PDN连接请求消息，PDN连接请求消息的请求类型为切换；漫游5G网络和归属4G网络之间未配置互操作接口；指示通信单元1101向核心网设备发送附着请求消息。Optionally, the core network device is an MME in the home 4G network, and 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.
可选的，处理单元1102，还用于：指示通信单元1101接收来自接入网设备的RRC连接重配置消息和附着响应消息；RRC连接重配置消息为接入网设备接收到来自核心网设备的初始上下文建立请求消息后生成的消息；指示通信单元1101向核心网设备发送附着完成消息。Optionally, 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.
可选的，处理单元1102，还用于：指示通信单元1101向核心网设备发送TAU请求消息；TAU消息中包括第一GUTI；第一GUTI为从终端设备在漫游5G网络中的GUTI映射得到的GUTI；指示通信单元1101接收来自核心网设备的TAU拒绝消息。Optionally, 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.
可选的，核心网设备为漫游5G网络中的AMF，处理单元1102，还用于：在终端设备从归属4G网络移动到漫游5G网络之后，生成第二注册请求；第二注册请求消息的注册类型为移动性注册更新；述漫游5G网络和归属4G网络之间未配置互操作接口；指示通信单元1101向核心网设备发送第二注册请求。Optionally, the core network device is an AMF in the roaming 5G network, and 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.
可选的，处理单元1102，还用于指示通信单元1101接收来自核心网设备的第三注册接受消息；第三注册接受消息用于表示核心网设备支持第一互操作。Optionally, 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.
可选的，该终端设备还可以包括存储模块，用于存储终端设备的程序代码和/或数据。Optionally, the terminal device may further include a storage module, configured to store program codes and/or data of the terminal device.
其中，处理单元1102可以是处理器或控制器。其可以实现或执行结合本申请公开内容所描述的各种示例性的逻辑方框，模块和电路。处理器也可以是实现计算功能的组合，例如包括一个或多个微处理器组合，DSP和微处理器的组合等等。通信单元1101可以是收发电路或通信接口等。存储模块可以是存储器。当处理单元1102为处理器，通信单元1101为通信接口，存储模块为存储器时，本申请实施例所涉及的终端设备可以为图1所示终端设备。Wherein, 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 .
通过以上的实施方式的描述，所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，仅以上述各功能模块的划分进行举例说明，实际应用中，可以根据需要而将上述功能分配由不同的功能模块完成，即将网络节点的内部结构划分成不同的功能模块，以完成以上描述的全部或者部分功能。上述描述的***，模块和网络节点的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。Through the description of the above embodiments, those skilled in the art can clearly understand that for the convenience and brevity of the description, only the division of the above-mentioned functional modules is used as an example for illustration. In practical applications, the above-mentioned functions can be allocated according to needs It is completed by different functional modules, that is, the internal structure of the network node is divided into different functional modules to complete all or part of the functions described above. For the specific working process of the system, modules, and network nodes described above, reference may be made to the corresponding process in the foregoing method embodiments, which will not be repeated here.
本申请实施例还提供一种计算机可读存储介质，计算机可读存储介质中存储有指令，当计算机执行该指令时，该计算机执行上述方法实施例所示的方法流程中的各个步骤。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.
本申请的实施例提供一种包含指令的计算机程序产品，当指令在计算机上运行时，使得计算机执行上述方法实施例中的通信方法。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.
本申请的实施例提供一种芯片，芯片包括处理器和通信接口，通信接口和处理器耦合，处理器用于运行计算机程序或指令，以实现如上述方法实施例中的通信方法。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.
其中，计算机可读存储介质，例如可以是但不限于电、磁、光、电磁、红外线、或半导体的***、装置或器件，或者任意以上的组合。计算机可读存储介质的更具体的例子(非穷举的列表)包括：具有一个或多个导线的电连接、便携式计算机磁盘、硬盘。随机存取存储器(Random Access Memory，RAM)、只读存储器(Read-Only Memory，ROM)、可擦式可编程只读存储器(Erasable Programmable Read Only Memory，EPROM)、寄存器、硬盘、光纤、便携式紧凑磁盘只读存储器(Compact Disc Read-Only Memory，CD-ROM)、光存储器件、磁存储器件、或者上述的人以合适的组合、或者本领域数值的任何其他形式的计算机可读存储介质。一种示例性的存储介质耦合至处理器，从而使处理器能够从该存储介质读取信息，且可向该存储介质写入信息。当然，存储介质也可以是处理器的组成部分。处理器和存储介质可以位于特定用途集成电路(Application Specific Integrated Circuit，ASIC)中。在本发明实施例中，计算机可读存储介质可以是任何包含或存储程序的有形介质，该程序可以被指令执行***、装置或者器件使用或者与其结合使用。Wherein, 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. Of course, 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). In the embodiments of the present invention, 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.
由于本发明的实施例中的装置、设备、计算机可读存储介质、计算机程序产品可以应用于上述方法，因此，其所能获得的技术效果也可参考上述方法实施例，本申请实施例在此不再赘述。Since the devices, equipment, computer-readable storage media, and computer program products in the embodiments of the present invention can be applied to the above-mentioned methods, the technical effects that can be obtained can also refer to the above-mentioned method embodiments, and the embodiments of the present application are hereby No longer.
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何在本申请揭露的技术范围内的变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应该以权利要求的保护范围为准。The above is only a specific implementation of the application, but the protection scope of the application is not limited thereto, and any changes or replacements within the technical scope disclosed in the application should be covered within the protection scope of the application . Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims (58)

  1. 一种通信方法，其特征在于，包括：A communication method, characterized in that, comprising:
    核心网设备接收来自终端设备的第一注册请求消息；The core network device receives the first registration request message from the terminal device;
    响应于所述第一注册请求消息，所述核心网设备向所述终端设备发送第一注册响应消息；所述第一注册响应消息用于指示所述核心网设备支持第一互操作；所述第一互操作用于保证终端设备在未配置互操作接口的公共陆地移动网PLMN网络之间移动时的业务连续性；在所述核心网设备和所述终端设备归属于同一运营商的情况下，所述第一注册响应消息中包括取值为第一目标值的第一预设字段；所述取值为第一目标值的第一预设字段用于指示所述核心网设备支持所述第一互操作。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 response message is used to indicate that the core network device supports a first interoperation; the The first interoperability is used to ensure the service continuity of the terminal equipment when it moves between public land mobile network PLMN networks without interoperable interfaces; in the case that the core network equipment and the terminal equipment belong to the same operator , the first registration response message includes a first preset field whose value is a first target value; the first preset field whose value is a first target value is used to indicate that the core network device supports the First interoperability.
  2. 根据权利要求1所述的方法，其特征在于，在所述核心网设备和所述终端设备归属于不同运营商的情况下，所述第一注册响应消息中包括取值为第二目标值的第二预设字段；所述取值为第二目标值的第二预设字段用于指示所述核心网设备支持所述第一互操作。The method according to claim 1, wherein, when the core network device and the terminal device belong to different operators, the first registration response message includes a second target value A second preset field; the second preset field whose value is a second target value is used to indicate that the core network device supports the first interoperation.
  3. 根据权利要求1或2所述的方法，其特征在于，所述第一注册响应消息，还用于指示所述核心网设备支持第二互操作；所述第二互操作用于保证所述终端设备在配置有互操作接口的同一PLMN网络内切换时的业务连续性。The method according to claim 1 or 2, wherein the first registration response message is also used to indicate that the core network equipment supports the second interoperation; the second interoperation is used to ensure that the terminal Business continuity when devices are handed over within the same PLMN network configured with interoperable interfaces.
  4. 根据权利要求3所述的方法，其特征在于，所述第一注册响应消息中还包括取值为第三目标值的第三预设字段；所述取值为第三目标值的第三预设字段用于指示所述核心网设备支持所述第二互操作。The method according to claim 3, wherein 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 The set field is used to indicate that the core network device supports the second interoperation.
  5. 根据权利要求1或2所述的方法，其特征在于，所述核心网设备为漫游运营商的认证管理功能AMF，在所述核心网设备向所述终端设备发送第一注册响应消息之前，所述方法还包括：The method according to claim 1 or 2, wherein the core network device is an authentication management function (AMF) of a roaming operator, and before the core network device sends a first registration response message to the terminal device, the The method also includes:
    所述核心网设备确定所述终端设备所属的PLMN网络的标识；The core network device determines the identifier of the PLMN network to which the terminal device belongs;
    在所述终端设备所属的PLMN网络的标识为第一预设PLMN网络标识时，所述核心网设备向所述终端设备发送所述第一注册响应消息。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 the first registration response message to the terminal device.
  6. 根据权利要求5所述的方法，其特征在于，在所述终端设备所属的PLMN网络的标识为第二预设PLMN网络标识时，所述第一注册响应消息用于指示所述核心网设备支持第二互操作。The method according to claim 5, wherein when the identifier of the PLMN network to which the terminal device belongs is the second preset PLMN network identifier, the first registration response message is used to indicate that the core network device supports Second interoperability.
  7. 根据权利要求6所述的方法，其特征在于，所述第一注册响应消息中包括取值为第四目标值的第二预设字段；所述取值为第四目标值的第二预设字段用于指示所述核心网设备支持所述第二互操作。The method according to claim 6, wherein 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 The field is used to indicate that the core network device supports the second interoperation.
  8. 根据权利要求7所述的方法，其特征在于，所述第一注册响应消息中包括取值为第三目标值的第三预设字段；所述取值为第三目标值的第三预设字段用于指示所述核心网设备支持所述第二互操作。The method according to claim 7, wherein 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 The field is used to indicate that the core network device supports the second interoperation.
  9. 根据权利要求1或2所述的方法，其特征在于，所述第一注册请求消息用于指示所述终端设备支持所述第一互操作。The method according to claim 1 or 2, wherein the first registration request message is used to indicate that the terminal device supports the first interoperation.
  10. 根据权利要求9所述的方法，其特征在于，所述第一注册请求消息中包括取值为第五目标值的第四预设字段；所述取值为第五目标值的第四预设字段用于指示所述终端设备支持所述第一互操作。The method according to claim 9, wherein 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 The field is used to indicate that the terminal device supports the first interoperation.
  11. 根据权利要求9所述的方法，其特征在于，所述第一注册请求消息还用于指示所述终端设备支持第二互操作。The method according to claim 9, wherein the first registration request message is also used to indicate that the terminal device supports the second interoperation.
  12. 根据权利要求11所述的方法，其特征在于，所述第一注册请求消息中还包括取值为第六目标值的第五预设字段；所述取值为第六目标值的第五预设字段用于指示所述终端设备支持所述第二互操作。The method according to claim 11, wherein 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 The set field is used to indicate that the terminal device supports the second interoperation.
  13. 根据权利要求1或2所述的方法，其特征在于，所述核心网设备为归属网络中的移动性管理实体MME，或者所述核心网设备为漫游网络中的AMF。The method according to claim 1 or 2, wherein the core network device is a Mobility Management Entity (MME) in a home network, or the core network device is an AMF in a roaming network.
  14. 根据权利要求13所述的方法，其特征在于，若所述核心网设备为归属***移动通信技术4G网络中的MME，则所述第一注册请求消息中还包括取值为第七目标值的第六预设字段，所述取值为第七目标值的第六预设字段用于指示所述终端设备支持第五代移动通信技术5G网络的N1接口；The method according to claim 13, wherein, if the core network device is an MME in a 4G network belonging to the fourth generation mobile communication technology, the first registration request message further includes the value of the seventh target A sixth preset field of 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 fifth-generation mobile communication technology 5G network;
    若所述核心网设备为漫游5G网络中的AMF，则所述第一注册请求消息中还包括取值为第八目标值的第七预设字段，所述取值为第八目标值的第七预设字段用于指示所述终端设备支持4G网络的S1接口。If the core network device is an AMF in a roaming 5G network, the first registration request message also includes a seventh preset field with a value of the eighth target value, and the value is the first field of the eighth target value The seven preset fields are used to indicate that the terminal device supports the S1 interface of the 4G network.
  15. 根据权利要求14所述的方法，其特征在于，若所述核心网设备为归属4G网络中的MME，则所述第一注册请求消息为所述终端设备向所述核心网设备发送的Attach Request消息，所述第一注册响应消息为所述核心网设备向所述终端设备发送的Attach Accept消息；The method according to claim 14, wherein if the core network device is an MME in a home 4G network, the first registration request message is an Attach Request sent by the terminal device to the core network device message, the first registration response message is an Attach Accept message sent by the core network device to the terminal device;
    若所述核心网设备为漫游5G网络中的AMF，则所述第一注册请求消息为所述终端设备向所述核心网设备发送的Registration Request消息，所述第一注册响应消息为所述核心网设备向所述终端设备发送的Registration Accept消息。If the core network device is an AMF in a roaming 5G network, the first registration request message is a Registration Request message sent by the terminal device to the core network device, and the first registration response message is the core The Registration Accept message sent by the network device to the terminal device.
  16. 根据权利要求15所述的方法，其特征在于，在所述核心网设备为归属4G网络中的MME的情况下，所述核心网设备支持所述第一互操作通过以下步骤实现：The method according to claim 15, wherein when the core network device is an MME in a home 4G network, the core network device supports the first interoperability through the following steps:
    所述核心网设备接收来自终端设备的附着请求消息；其中，所述附着请求消息为所述终端设备从所述漫游5G网络移动到所述归属4G网络之后生成的附着请求消息；所述附着请求消息中包括公用数据网PDN连接请求消息，所述PDN连接请求消息的请求类型为切换；所述漫游5G网络和所述归属4G网络之间未配置互操作接口；The core network device receives an attach request message from a terminal device; wherein, 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 The message includes a public data network 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;
    响应于所述附着请求消息，所述核心网设备向归属签约用户服务器+统一数据管理功能HSS+UDM发送位置更新请求消息；所述位置更新请求消息为指示所述HSS+UDM不向old AMF发起取消登记流程的位置更新请求消息；所述old AMF为所述第二PLMN网络中的AMF；In response to the attach request message, the core network device sends a location update request message to the home subscriber server+unified data management function HSS+UDM; the location update request message is to indicate that the HSS+UDM does not initiate the old AMF Cancel the location update request message of the registration process; the old AMF is the AMF in the second PLMN network;
    所述核心网设备接收来自所述HSS+UDM的位置更新响应消息；所述位置更新响应消息中包括与所述第一协议数据单元PDU会话对应的PDN网关控制面+会话管理功能PGWC+SMF全称域名FQDN；The core network device receives a location update response message from the HSS+UDM; the location update response message includes the full name of the PDN gateway control plane + session management function PGWC+SMF corresponding to the first protocol data unit PDU session domain name FQDN;
    所述核心网设备根据所述PGWC+SMF FQDN发起PDU创建会话流程；该PDU会话创建流程用于在所述第一PLMN网络中建立第二PDU会话，并关联所述第一PDU会话和所述第二PDU会话。The core network device initiates a PDU session creation 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.
  17. 根据权利要求16所述的方法，其特征在于，在所述核心网设备根据所述PGWC+SMF FQDN发起PDU创建会话流程之后，所述方法还包括：The method according to claim 16, wherein, after the core network device initiates a PDU creation session process according to the PGWC+SMF FQDN, the method further comprises:
    所述核心网设备向接入网设备发送初始上下文建立请求和附着响应消息；The core network device sends an initial context establishment request and an attach response message to the access network device;
    所述核心网设备接收来自所述接入网设备的初始上下文建立响应消息，以及来自所述终端设备的附着完成消息。The core network device receives an initial context establishment response message from the access network device, and an attach completion message from the terminal device.
  18. 根据权利要求17所述的方法，其特征在于，所述附着响应消息用于指示所述核心网设备支持所述第一互操作。The method according to claim 17, wherein the attach response message is used to indicate that the core network device supports the first interoperation.
  19. 根据权利要求16-18任一项所述的方法，其特征在于，在所述核心网设备接收来自终端设备的附着请求消息之前，所述方法还包括：The method according to any one of claims 16-18, wherein before the core network device receives the attach request message from the terminal device, the method further comprises:
    所述核心网设备接收来自所述终端设备的TAU请求消息；所述TAU消息中包括第一全球唯一临时标识GUTI；所述第一GUTI为从所述终端设备在所述漫游5G网络中的GUTI映射得到的GUTI；The core network device receives a TAU request message from the terminal device; the TAU message includes a first globally unique temporary identifier GUTI; the first GUTI is the GUTI from the terminal device in the roaming 5G network The mapped GUTI;
    所述核心网设备根据所述第一GUTI确定无法获取所述终端设备的上下文；The core network device determines according to the first GUTI that the context of the terminal device cannot be obtained;
    所述核心网设备向所述终端设备发送TAU拒绝消息。The core network device sends a TAU rejection message to the terminal device.
  20. 根据权利要求15所述的方法，其特征在于，在所述核心网设备为漫游5G网络中的AMF的情况下，所述核心网设备支持所述第一互操作通过以下步骤实现：The method according to claim 15, wherein when the core network device is an AMF in a roaming 5G network, the core network device supports the first interoperability through the following steps:
    所述核心网设备接收来自终端设备的第二注册请求消息；所述第二注册请求为所述终端设备从所述归属4G网络移动到所述漫游5G网络之后生成的注册请求；所述第二注册请求消息的注册类型为移动性注册更新；所述漫游5G网络和所述归属4G网络之间未配置互操作接口；The core network device receives a 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 second The registration type of the registration request message is mobility registration update; no interoperability interface is configured between the roaming 5G network and the home 4G network;
    响应于所述注册请求消息，所述核心网设备向HSS+UDM发送UDM注册请求，所述UDM注册请求用于指示所述HSS+UDM不进行位置删除操作；In response to the registration request message, the core network device sends a UDM registration request to the HSS+UDM, where the UDM registration request is used to instruct the HSS+UDM not to perform a location deletion operation;
    所述核心网设备接收来自所述HSS+UDM的所述终端设备的签约数据；所述签约数据包括以下至少一项：数据网络名称DNN或接入点名称APN，以及所述第三PDU连接的SMF+PGW-C FQDN；The core network device receives the subscription data from the terminal device of the HSS+UDM; the subscription data includes at least one of the following: data network name DNN or access point name APN, and the third PDU connection SMF+PGW-C FQDN;
    所述核心网设备根据所述DNN或APN和所述第三PDU连接的SMF+PGW-C FQDN，发起第四PDU会话建立流程；所述第四PDU会话建立流程用于在所述第二PLMN网络中建立所述第四PDU会话，并关联所述第三PDU会话和所述第四PDU会话。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 fourth PDU session establishment process is used in the second PLMN The fourth PDU session is established in the network, and the third PDU session is associated with the fourth PDU session.
  21. 根据权利要求20所述的方法，其特征在于，在所述核心网设备接收来自所述HSS+UDM的所述终端设备的签约数据之后，所述方法还包括：The method according to claim 20, characterized in that, after the core network equipment receives the subscription data from the terminal equipment of the HSS+UDM, the method further comprises:
    所述核心网设备向所述终端设备发送第三注册接受消息；所述第三注册接受消息用于表示所述核心网设备支持所述第一互操作。The core network device sends 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.
  22. 一种通信方法，其特征在于，包括：A communication method, characterized in that, comprising:
    终端设备向核心网设备发送第一注册请求消息；The terminal device sends a first registration request message to the core network device;
    所述终端设备接收来自所述核心网设备的第一注册响应消息；所述第一注册响应消息用于指示所述核心网设备支持第一互操作；所述第一互操作用于保证终端设备在未配置互操作接口的PLMN网络之间移动时的业务连续性；在所述核心网设备和所述终端设备归属于同一运营商的情况下，所述第一注册响应消息中包括取值为第一目标值的第一预设字段；所述取值为第一目标值的第一预设字段用于指示所述核心网设备支持所述第一互操作。The terminal device receives a first registration response message from the core network device; the first registration response message is used to indicate that the core network device supports a first interoperation; the first interoperation is used to ensure that the terminal device Service continuity when moving between PLMN networks that are not configured with an interoperable interface; when the core network device and the terminal device belong to the same operator, the value included in the first registration response message is A first preset field of the first target value; the first preset field whose value is the first target value is used to indicate that the core network device supports the first interoperation.
  23. 根据权利要求22所述的方法，其特征在于，所述第一注册请求消息用于表示所述终端设备支持所述第一互操作。The method according to claim 22, wherein the first registration request message is used to indicate that the terminal device supports the first interoperation.
  24. 根据权利要求23所述的方法，其特征在于，在所述核心网设备为归属4G网络中的MME的情况下，所述终端设备支持所述第一互操作通过以下步骤实现：The method according to claim 23, wherein when the core network device is an MME in a home 4G network, the terminal device supports the first interoperability through the following steps:
    在所述终端设备从所述漫游5G网络移动到所述归属4G网络之后，所述终端设备生成附着请求消息；所述附着请求消息中包括PDN连接请求消息，所述PDN连接请求消息的请求类型为切换；所述漫游5G网络和所述归属4G网络之间未配置互操作接口；After the terminal device moves from the roaming 5G network to 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 It is handover; no interoperable interface is configured between the roaming 5G network and the home 4G network;
    所述终端设备向所述核心网设备发送所述附着请求消息。The terminal device sends the attach request message to the core network device.
  25. 根据权利要求24所述的方法，其特征在于，在所述终端设备向所述核心网设备发送所述附着请求消息之后，所述方法还包括：The method according to claim 24, wherein after the terminal device sends the attach request message to the core network device, the method further comprises:
    所述终端设备接收来自接入网设备的无线资源控制RRC连接重配置消息和附着响应消息；所述RRC连接重配置消息为所述接入网设备接收到来自所述核心网设备的初始上下文建立请求消息后生成的消息；The terminal device receives a radio resource control RRC connection reconfiguration message and an attachment response message from the access network device; the RRC connection reconfiguration message is the initial context establishment received by the access network device from the core network device A message generated after a request message;
    所述终端设备向所述核心网设备发送附着完成消息。The terminal device sends an attach completion message to the core network device.
  26. 根据权利要求24或25所述的方法，其特征在于，在所述终端设备向所述核心网设备发送所述附着请求消息之前，所述方法还包括：The method according to claim 24 or 25, wherein before the terminal device sends the attach request message to the core network device, the method further comprises:
    所述终端设备向所述核心网设备发送跟踪区更新TAU请求消息；所述TAU消息中包括第一GUTI；所述第一GUTI为从所述终端设备在所述漫游5G网络中的GUTI映射得到的GUTI；The terminal device sends a tracking area update TAU request message to the core network device; the TAU message includes a first GUTI; the first GUTI is obtained from the GUTI mapping of the terminal device in the roaming 5G network the GUTI;
    所述终端设备接收来自所述核心网设备的TAU拒绝消息。The terminal device receives the TAU rejection message from the core network device.
  27. 根据权利要求23所述的方法，其特征在于，在所述核心网设备为漫游5G网络中的AMF的情况下，所述终端设备支持所述第一互操作通过以下步骤实现：The method according to claim 23, wherein when the core network device is an AMF in a roaming 5G network, the terminal device supports the first interoperability through the following steps:
    在所述终端设备从所述归属4G网络移动到所述漫游5G网络之后，所述终端设备生成第二注册请求；所述第二注册请求消息的注册类型为移动性注册更新；所述漫游5G网络和所述归属4G网络之间未配置互操作接口；After the terminal device moves from the home 4G network to the roaming 5G network, the terminal device generates a second registration request; the registration type of the second registration request message is mobility registration update; the roaming 5G No interoperable interface is configured between the network and the home 4G network;
    所述终端设备向所述核心网设备发送所述第二注册请求。The terminal device sends the second registration request to the core network device.
  28. 根据权利要求27所述的方法，其特征在于，所述方法还包括：The method according to claim 27, further comprising:
    所述终端设备接收来自所述核心网设备的第三注册接受消息；所述第三注册接受消息用于表示所述核心网设备支持所述第一互操作。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.
  29. 一种核心网设备，其特征在于，包括：处理单元和通信单元；A core network device, characterized in that it includes: a processing unit and a communication unit;
    所述处理单元，用于指示所述通信单元接收来自终端设备的第一注册请求消息；The processing unit is configured to instruct the communication unit to receive the first registration request message from the terminal device;
    响应于所述第一注册请求消息，所述处理单元，还用于指示所述通信单元向所述终端设备发送第一注册响应消息；所述第一注册响应消息用于指示所述核心网设备支持第一互操作；所述第一互操作用于保证终端设备在未配置互操作接口的PLMN网络之间移动时的业务连续性；在所述核心网设备和所述终端设备归属于同一运营商的情况下，所述第一注册响应消息中包括取值为第一目标值的第一预设字段；所述取值为第一目标值的第一预设字段用于指示所述核心网设备支持所述第一互操作。In response to the first registration request message, the processing unit is further configured to instruct the communication unit to send a first registration response message to the terminal device; the first registration response message is used to instruct the core network device Support the first interoperability; the first interoperability is used to ensure the service continuity of the terminal equipment when it moves between PLMN networks without interoperable interfaces; when the core network equipment and the terminal equipment belong to the same operator In the case of quotient, the first registration response message includes a first preset field whose value is the first target value; the first preset field whose value is the first target value is used to indicate that the core network The device supports the first interoperation.
  30. 根据权利要求29所述的核心网设备，其特征在于，在所述核心网设备和所述 终端设备归属于不同运营商的情况下，所述第一注册响应消息中包括取值为第二目标值的第二预设字段；所述取值为第二目标值的第二预设字段用于指示所述核心网设备支持所述第一互操作。The core network device according to claim 29, wherein when the core network device and the terminal device belong to different operators, the first registration response message includes a value of the second target A second preset field with a value; the second preset field whose value is a second target value is used to indicate that the core network device supports the first interoperation.
  31. 根据权利要求29或30所述的核心网设备，其特征在于，所述第一注册响应消息，还用于指示所述核心网设备支持第二互操作；所述第二互操作用于保证所述终端设备在配置有互操作接口的同一PLMN网络内切换时的业务连续性。The core network device according to claim 29 or 30, wherein the first registration response message is further used to indicate that the core network device supports the second interoperation; the second interoperation is used to ensure that the Describes the service continuity when the terminal equipment is handed over within the same PLMN network configured with an interoperable interface.
  32. 根据权利要求31所述的核心网设备，其特征在于，所述第一注册响应消息中还包括取值为第三目标值的第三预设字段；所述取值为第三目标值的第三预设字段用于指示所述核心网设备支持所述第二互操作。The core network device according to claim 31, wherein the first registration response message further includes a third preset field whose value is a third target value; the first field whose value is a third target value The three preset fields are used to indicate that the core network device supports the second interoperation.
  33. 根据权利要求29或30所述的核心网设备，其特征在于，所述处理单元，还用于：The core network device according to claim 29 or 30, wherein the processing unit is further configured to:
    确定所述终端设备所属的PLMN网络的标识；Determine the identifier of the PLMN network to which the terminal device belongs;
    在所述终端设备所属的PLMN网络的标识为第一预设PLMN网络标识时，指示所述通信单元向所述终端设备发送所述第一注册响应消息。Instructing the communication unit to send the first registration response message to the terminal device when the identifier of the PLMN network to which the terminal device belongs is a first preset PLMN network identifier.
  34. 根据权利要求33所述的核心网设备，其特征在于，在所述终端设备所属的PLMN网络的标识为第二预设PLMN网络标识时，所述第一注册响应消息用于指示所述核心网设备支持第二互操作。The core network device according to claim 33, wherein when the identifier of the PLMN network to which the terminal device belongs is the second preset PLMN network identifier, the first registration response message is used to indicate that the core network The device supports the second interoperability.
  35. 根据权利要求34所述的核心网设备，其特征在于，所述第一注册响应消息中包括取值为第四目标值的第二预设字段；所述取值为第四目标值的第二预设字段用于指示所述核心网设备支持所述第二互操作。The core network device according to claim 34, wherein the first registration response message includes a second preset field whose value is the fourth target value; the second field whose value is the fourth target value The preset field is used to indicate that the core network device supports the second interoperation.
  36. 根据权利要求34所述的核心网设备，其特征在于，所述第一注册响应消息中包括取值为第三目标值的第三预设字段；所述取值为第三目标值的第三预设字段用于指示所述核心网设备支持所述第二互操作。The core network device according to claim 34, wherein the first registration response message includes a third preset field whose value is a third target value; the third field whose value is a third target value The preset field is used to indicate that the core network device supports the second interoperation.
  37. 根据权利要求29或30所述的核心网设备，其特征在于，所述第一注册请求消息用于指示所述终端设备支持所述第一互操作。The core network device according to claim 29 or 30, wherein the first registration request message is used to indicate that the terminal device supports the first interoperation.
  38. 根据权利要求37所述的核心网设备，其特征在于，所述第一注册请求消息中包括取值为第五目标值的第四预设字段；所述取值为第五目标值的第四预设字段用于指示所述终端设备支持所述第一互操作。The core network device according to claim 37, wherein 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 The preset field is used to indicate that the terminal device supports the first interoperation.
  39. 根据权利要求37所述的核心网设备，其特征在于，所述第一注册请求消息还用于指示所述终端设备支持所述第二互操作。The core network device according to claim 37, wherein the first registration request message is further used to indicate that the terminal device supports the second interoperation.
  40. 根据权利要求39所述的核心网设备，其特征在于，所述第一注册请求消息中还包括取值为第六目标值的第五预设字段；所述取值为第六目标值的第五预设字段用于指示所述终端设备支持所述第二互操作。The core network device according to claim 39, wherein 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 The five preset fields are used to indicate that the terminal device supports the second interoperation.
  41. 根据权利要求29或30所述的核心网设备，其特征在于，所述核心网设备为归属网络中的MME，或者所述核心网设备为漫游网络中的AMF。The core network device according to claim 29 or 30, wherein the core network device is an MME in a home network, or the core network device is an AMF in a roaming network.
  42. 根据权利要求41所述的核心网设备，其特征在于，若所述核心网设备为归属4G网络中的MME，则所述第一注册请求消息中还包括取值为第七目标值的第六预设字段，所述取值为第七目标值的第六预设字段用于指示所述终端设备支持5G网络的N1接口；The core network device according to claim 41, wherein if the core network device is an MME in the home 4G network, the first registration request message further includes the sixth target value of the seventh target value. A preset field, 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;
    若所述核心网设备为漫游5G网络中的AMF，则所述第一注册请求消息中还包括取值为第八目标值的第七预设字段，所述取值为第八目标值的第七预设字段用于指示所述终端设备支持4G网络的S1接口。If the core network device is an AMF in a roaming 5G network, the first registration request message also includes a seventh preset field with a value of the eighth target value, and the value is the first field of the eighth target value The seven preset fields are used to indicate that the terminal device supports the S1 interface of the 4G network.
  43. 根据权利要求42所述的核心网设备，其特征在于，若所述核心网设备为归属4G网络中的MME，则所述第一注册请求消息为所述终端设备向所述核心网设备发送的Attach Request消息，所述第一注册响应消息为所述核心网设备向所述终端设备发送的Attach Accept消息；The core network device according to claim 42, wherein if the core network device is an MME in a home 4G network, the first registration request message is sent by the terminal device to the core network device An Attach Request message, wherein the first registration response message is an Attach Accept message sent by the core network device to the terminal device;
    若所述核心网设备为漫游5G网络中的AMF，则所述第一注册请求消息为所述终端设备向所述核心网设备发送的Registration Request消息，所述第一注册响应消息为所述核心网设备向所述终端设备发送的Registration Accept消息。If the core network device is an AMF in a roaming 5G network, the first registration request message is a Registration Request message sent by the terminal device to the core network device, and the first registration response message is the core The Registration Accept message sent by the network device to the terminal device.
  44. 根据权利要求43所述的核心网设备，其特征在于，所述核心网设备为归属4G网络中的MME；所述处理单元，还用于：The core network device according to claim 43, wherein the core network device is an MME in a home 4G network; the processing unit is also used for:
    指示所述通信单元接收来自终端设备的附着请求消息；其中，所述附着请求消息为所述终端设备从所述漫游5G网络移动到所述归属4G网络之后生成的附着请求消息；所述附着请求消息中包括PDN连接请求消息，所述PDN连接请求消息的请求类型为切换；所述漫游5G网络和所述归属4G网络之间未配置互操作接口；Instructing the communication unit to receive an attach request message from a terminal device; wherein, 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 The 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;
    响应于所述附着请求消息，指示所述通信单元向HSS+UDM发送位置更新请求消息；所述位置更新请求消息为指示所述HSS+UDM不向old AMF发起取消登记流程的位置更新请求消息；所述old AMF为所述第二PLMN网络中的AMF；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 AMF in the second PLMN network;
    指示所述通信单元接收来自所述HSS+UDM的位置更新响应消息；所述位置更新响应消息中包括与所述第一PDU会话对应的PGWC+SMF FQDN；Instructing the communication unit to receive a location update response message from the HSS+UDM; the location update response message includes the PGWC+SMF FQDN corresponding to the first PDU session;
    根据所述PGWC+SMF FQDN发起PDU创建会话流程；该PDU会话创建流程用于在所述第一PLMN网络中建立第二PDU会话，并关联所述第一PDU会话和所述第二PDU会话。Initiate a PDU session creation 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.
  45. 根据权利要求44所述的核心网设备，其特征在于，所述处理单元，还用于：The core network device according to claim 44, wherein the processing unit is further configured to:
    指示所述通信单元向接入网设备发送初始上下文建立请求和附着响应消息；Instructing the communication unit to send an initial context establishment request and an attach response message to the access network device;
    指示所述通信单元接收来自所述接入网设备的初始上下文建立响应消息，以及来自所述终端设备的附着完成消息。Instructing the communication unit to receive an initial context establishment response message from the access network device and an attach completion message from the terminal device.
  46. 根据权利要求45所述的核心网设备，其特征在于，所述附着响应消息用于指示所述核心网设备支持所述第一互操作。The core network device according to claim 45, wherein the attach response message is used to indicate that the core network device supports the first interoperation.
  47. 根据权利要求44-46任一项所述的核心网设备，其特征在于，所述处理单元，还用于：The core network device according to any one of claims 44-46, wherein the processing unit is further configured to:
    指示所述通信单元接收来自所述终端设备的TAU请求消息；所述TAU消息中包括第一GUTI；所述第一GUTI为从所述终端设备在所述漫游5G网络中的GUTI映射得到的GUTI；Instructing the communication unit to receive a TAU request message from the terminal device; the TAU message includes a first GUTI; the first GUTI is a GUTI obtained from the GUTI mapping of the terminal device in the roaming 5G network ;
    根据所述第一GUTI确定无法获取所述终端设备的上下文；determining according to the first GUTI that the context of the terminal device cannot be acquired;
    指示所述通信单元向所述终端设备发送TAU拒绝消息。Instructing the communication unit to send a TAU rejection message to the terminal device.
  48. 根据权利要求43所述的核心网设备，其特征在于，所述核心网设备为漫游5G网络中的AMF，所述处理单元，还用于：The core network device according to claim 43, wherein the core network device is an AMF in a roaming 5G network, and the processing unit is also used for:
    指示所述通信单元接收来自终端设备的第二注册请求消息；所述第二注册请求为所述终端设备从所述归属4G网络移动到所述漫游5G网络之后生成的注册请求；所述第二注册请求消息的注册类型为移动性注册更新；所述漫游5G网络和所述归属4G网络之间未配置互操作接口；Instructing the communication unit to receive a 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 second The registration type of the registration request message is mobility registration update; no interoperability interface is configured between the roaming 5G network and the home 4G network;
    响应于所述注册请求消息，指示所述通信单元向HSS+UDM发送UDM注册请求，所述UDM注册请求用于指示所述HSS+UDM不进行位置删除操作；In response to the registration request message, instruct the communication unit to send a UDM registration request to the HSS+UDM, where the UDM registration request is used to instruct the HSS+UDM not to perform a location deletion operation;
    指示所述通信单元接收来自所述HSS+UDM的所述终端设备的签约数据；所述签约数据包括以下至少一项：DNN或APN，以及所述第三PDU连接的SMF+PGW-C FQDN；Instructing the communication unit to receive the subscription data of the terminal device from the HSS+UDM; the subscription data includes at least one of the following: DNN or APN, and the SMF+PGW-C FQDN connected to the third PDU;
    根据所述DNN或APN和所述第三PDU连接的SMF+PGW-C FQDN，发起第四PDU会话建立流程；所述第四PDU会话建立流程用于在所述第二PLMN网络中建立所述第四PDU会话，并关联所述第三PDU会话和所述第四PDU会话。According to the SMF+PGW-C FQDN connected by the DNN or APN and the third PDU, initiate a fourth PDU session establishment procedure; the fourth PDU session establishment procedure is used to establish the described second PLMN network A fourth PDU session, and associate the third PDU session with the fourth PDU session.
  49. 根据权利要求48所述的核心网设备，其特征在于，所述处理单元，还用于：The core network device according to claim 48, wherein the processing unit is further configured to:
    指示所述通信单元向所述终端设备发送第三注册接受消息；所述第三注册接受消息用于表示所述核心网设备支持所述第一互操作。Instructing 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 interoperation.
  50. 一种终端设备，其特征在于，包括：处理单元和通信单元；A terminal device, characterized by comprising: a processing unit and a communication unit;
    所述处理单元，用于指示所述通信单元向核心网设备发送第一注册请求消息；The processing unit is configured to instruct the communication unit to send a first registration request message to the core network device;
    所述处理单元，还用于指示所述通信单元接收来自所述核心网设备的第一注册响应消息；所述第一注册响应消息用于指示所述核心网设备支持第一互操作；所述第一互操作用于保证终端设备在未配置互操作接口的PLMN网络之间移动时的业务连续性；在所述核心网设备和所述终端设备归属于同一运营商的情况下，所述第一注册响应消息中包括取值为第一目标值的第一预设字段；所述取值为第一目标值的第一预设字段用于指示所述核心网设备支持所述第一互操作。The processing unit is further configured to instruct the communication unit to receive a first registration response message from the core network device; the first registration response message is used to indicate that the core network device supports first interoperation; the The first interoperability is used to ensure the service continuity of the terminal equipment when it moves between PLMN networks without interoperable interfaces; when the core network equipment and the terminal equipment belong to the same operator, the second A registration response message includes a first preset field whose value is a first target value; the first preset field whose value is a first target value is used to indicate that the core network device supports the first interoperability .
  51. 根据权利要求50所述的终端设备，其特征在于，所述第一注册请求消息用于表示所述终端设备支持所述第一互操作。The terminal device according to claim 50, wherein the first registration request message is used to indicate that the terminal device supports the first interoperation.
  52. 根据权利要求51所述的终端设备，其特征在于，所述核心网设备为归属4G网络中的MME，所述处理单元，还用于：The terminal device according to claim 51, wherein the core network device is an MME in a home 4G network, and the processing unit is also used for:
    在所述终端设备从所述漫游5G网络移动到所述归属4G网络之后，生成附着请求消息；所述附着请求消息中包括PDN连接请求消息，所述PDN连接请求消息的请求类型为切换；所述漫游5G网络和所述归属4G网络之间未配置互操作接口；After the terminal device moves from the roaming 5G network to the home 4G network, an attach request message is generated; the attach request message includes a PDN connection request message, and the request type of the PDN connection request message is handover; There is no interoperable interface configured between the roaming 5G network and the home 4G network;
    指示所述通信单元向所述核心网设备发送所述附着请求消息。Instructing the communication unit to send the attach request message to the core network device.
  53. 根据权利要求52所述的终端设备，其特征在于，所述处理单元，还用于：The terminal device according to claim 52, wherein the processing unit is further configured to:
    指示所述通信单元接收来自接入网设备的RRC连接重配置消息和附着响应消息；所述RRC连接重配置消息为所述接入网设备接收到来自所述核心网设备的初始上下文建立请求消息后生成的消息；Instructing the communication unit to receive an RRC connection reconfiguration message and an attach response message from an access network device; the RRC connection reconfiguration message is that the access network device receives an initial context establishment request message from the core network device messages generated after;
    指示所述通信单元向所述核心网设备发送附着完成消息。Instructing the communication unit to send an attach completion message to the core network device.
  54. 根据权利要求52或53所述的终端设备，其特征在于，所述处理单元，还用于：The terminal device according to claim 52 or 53, wherein the processing unit is further configured to:
    指示所述通信单元向所述核心网设备发送TAU请求消息；所述TAU消息中包括 第一GUTI；所述第一GUTI为从所述终端设备在所述漫游5G网络中的GUTI映射得到的GUTI；Instructing 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 a GUTI obtained from the GUTI mapping of the terminal device in the roaming 5G network ;
    指示所述通信单元接收来自所述核心网设备的TAU拒绝消息。Instructing the communication unit to receive the TAU rejection message from the core network device.
  55. 根据权利要求51所述的终端设备，其特征在于，所述核心网设备为漫游5G网络中的AMF，所述处理单元，还用于：The terminal device according to claim 51, wherein the core network device is an AMF in a roaming 5G network, and the processing unit is also used for:
    在所述终端设备从所述归属4G网络移动到所述漫游5G网络之后，生成第二注册请求；所述第二注册请求消息的注册类型为移动性注册更新；所述漫游5G网络和所述归属4G网络之间未配置互操作接口；After the terminal device moves from the home 4G network to the roaming 5G network, a second registration request is generated; the registration type of the second registration request message is mobility registration update; the roaming 5G network and the There is no interoperable interface configured between the home 4G networks;
    指示所述通信单元向所述核心网设备发送所述第二注册请求。Instructing the communication unit to send the second registration request to the core network device.
  56. 根据权利要求55所述的终端设备，其特征在于，所述处理单元，还用于指示所述通信单元接收来自所述核心网设备的第三注册接受消息；所述第三注册接受消息用于表示所述核心网设备支持所述第一互操作。The terminal device according to claim 55, wherein 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 for Indicates that the core network device supports the first interoperation.
  57. 一种通信装置，其特征在于，包括：处理器以及存储器；其中，所述存储器用于存储计算机执行指令，当所述通信装置设备运行时，所述处理器执行所述存储器存储的所述计算机执行指令，以使所述电子设备执行权利要求1-28中任一项所述的通信方法。A communication device, characterized in that it includes: a processor and a memory; wherein the memory is used to store computer-executable instructions, and when the communication device is running, the processor executes the computer stored in the memory Executing instructions, so that the electronic device executes the communication method described in any one of claims 1-28.
  58. 一种计算机可读存储介质，其特征在于，所述计算机可读存储介质包括指令，所述指令当被电子设备执行时使所述计算机执行如权利要求1-28中任一项所述的通信方法。A computer-readable storage medium, characterized in that the computer-readable storage medium includes instructions, and the instructions, when executed by an electronic device, cause the computer to perform the communication according to any one of claims 1-28 method.
PCT/CN2022/134821 2022-01-05 2022-11-28 Communication method and apparatus, and core network device, terminal device and storage medium WO2023130856A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110944367A (en) * 2019-12-20 2020-03-31 广东工业大学 4G and 5G interoperation method
CN112073368A (en) * 2020-07-29 2020-12-11 深圳市修远文化创意有限公司 Method for switching network interaction modes and related device thereof

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110944367A (en) * 2019-12-20 2020-03-31 广东工业大学 4G and 5G interoperation method
CN112073368A (en) * 2020-07-29 2020-12-11 深圳市修远文化创意有限公司 Method for switching network interaction modes and related device thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"3rd Generation Partnership Project; Technical Specification Group Services and System Aspects; System Architecture for the 5G System; Stage 2 (Release 16)", 3GPP TS 23.501, no. V16.0.0, 28 March 2019 (2019-03-28), pages 1 - 318, XP051722957 *

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