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WO2019034021A1 - Procédé et dispositif pour des opérations interactives entre différents systèmes - Google Patents

Procédé et dispositif pour des opérations interactives entre différents systèmes Download PDF

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Publication number
WO2019034021A1
WO2019034021A1 PCT/CN2018/100292 CN2018100292W WO2019034021A1 WO 2019034021 A1 WO2019034021 A1 WO 2019034021A1 CN 2018100292 W CN2018100292 W CN 2018100292W WO 2019034021 A1 WO2019034021 A1 WO 2019034021A1
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WO
WIPO (PCT)
Prior art keywords
network element
message
terminal
management network
access management
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Ceased
Application number
PCT/CN2018/100292
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English (en)
Chinese (zh)
Inventor
辛阳
吴晓波
崇卫微
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Publication date
Priority claimed from CN201710977703.3A external-priority patent/CN109391932A/zh
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Publication of WO2019034021A1 publication Critical patent/WO2019034021A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/18—Selecting a network or a communication service

Definitions

  • the present application relates to the field of information technology, and in particular, to a method and apparatus for interoperating different systems.
  • the embodiments of the present application provide a method and an apparatus for inter-system interoperability, which are used to solve the problem that the existing inter-system interoperation signaling is large and the operation is complicated.
  • the embodiment of the present application provides a method for inter-system interoperability, the method includes: the terminal first sending a first message to an access management network element of the first communications network, where the first message includes a first indication Information and second indication information, the first indication information is used to indicate that the terminal supports the first non-access stratum NAS of the first communication network and the second NAS of the second communication network, the second indication information Instructing the terminal to support registration of a single network, that is, the terminal notifies the network side of its own network capability, and then the first access management network element of the first communication network sends the first message to the terminal.
  • the response message of the first message includes information about whether an interface exists between the first access management network element and the second access management network element of the second communication network.
  • the terminal can perform the corresponding interoperability policy according to the existence of the interface on the network side.
  • the terminal can save the tracking area update (TAU) process.
  • the first communication network and the second communication network belong to two types of networks of different communication systems, for example, interoperability between the 5G system and the 4G system.
  • the terminal when the terminal determines that the interface does not exist according to the first response message, the terminal directly sends a registration request message to the second access management network element, because the registration request message further includes the handover indication information, so The terminal can switch to the second communication network. That is to say, if the terminal determines that there is no interface, the terminal directly switches to the target network, which obviously reduces the handover delay and ensures the continuity of the terminal service.
  • the first access management device selects a user management network element supporting the second communication network as much as possible. For example, after receiving the first message, the AMF selects to support the HSS.
  • the function of the UDM, so that the first response message fed back by the first access management device to the terminal further includes whether the user data management network element selected by the first access management network element supports the information of the second communication network, such that When the terminal determines that the user data management network element selected by the first access management network element in the first response message does not support the second communication network, and the two conditions that do not exist the interface satisfy one of the two conditions, the terminal may directly
  • the second communication network initiates a registration request and switches to the second communication network.
  • the above process is a process in which the terminal initiates registration with the network side.
  • the terminal can also inform the network side of its own network capability, and the network side can also feedback its own network support situation.
  • the terminal further performs a corresponding interoperation policy according to the support situation of the network side interoperation. Specifically, the terminal initiates a second message to the first access management network element, where the second message is used to request to establish a session.
  • the first access management network element feeds back the second response message of the second message to the terminal, where the second response message includes the session management network element, the policy control network element, and the user in the first communication network.
  • the terminal can learn the support situation of the network side compared with the prior art.
  • the terminal can switch in time instead of the existing one. The technology continues to try, so that the terminal side can make corresponding strategies according to the interoperability support situation on the network side, saving signaling. Mutual process.
  • the terminal determines, according to the second response message, at least the access management network element, the session management network element, the policy control network element, and the user plane network element in the first communication network. a message that does not support the second communication network; and when the terminal determines that the two conditions of the interface do not exist according to the first response message, the terminal sends a registration request to the second access management network element.
  • the message includes the handover indication information in the registration request message.
  • the embodiment of the present application further provides a method for inter-system interoperability, where the method is performed by a first access management network element, where the method includes: first receiving, by a first access management network element of the first communication network a first message from the terminal, where the first message includes first indication information and a second indication, where the first indication information is used to indicate that the terminal supports the first non-access stratum NAS of the first communication network.
  • the second indication information indicates that the terminal supports the registration capability of the single network; and then the first access management network element sends the first response message of the first message to the terminal, where The first response message includes information about whether an interface exists between the first access management network element and the second access management network element of the second communication network.
  • the embodiment of the present application further provides a method for inter-system interoperability, the method is performed by a first session management network element, where the method includes: the session management network element in the first communication network first receives the first communication a third message sent by the access management network element in the network, where the third message includes first indication information and second indication information, where the first indication information is used to indicate that the terminal supports the first communication network.
  • the second indication information is used to indicate that the terminal supports a single network registration capability, and then the session management network element is in accordance with the third message
  • the policy control network element supporting the second communication network and/or the user plane network element supporting the second communication network are selected in the first communication network.
  • the embodiment of the present application further provides a method for inter-system interoperability, which is performed by a first session management network element, where the method includes: receiving, by a first access network element of a first communication network, a terminal An access request message, where the access request message includes first indication information and second indication information, where the first indication information is used to indicate that the terminal supports the first non-access stratum NAS of the first communication network. And the second NAS of the second communication network, where the second indication information is used to indicate that the terminal supports the registration capability of the single network;
  • the first access network element selects an access management network element having an interface with the access management network element of the second communication network in the first communication network according to the access request message.
  • the terminal can perform a corresponding interoperation strategy according to the existence of the interface on the network side, and the process of initiating the TAU by the terminal can be saved compared with the prior art.
  • the embodiment of the present application further provides a device for inter-system interoperability, the device having a function for implementing terminal behavior in the method example of the first aspect above.
  • the functions may be implemented by hardware or by corresponding software implemented by hardware.
  • the hardware or the software includes one or more modules corresponding to the functions described above.
  • the structure of the device includes a receiving unit, a sending unit, and a determining unit, and the units may perform the corresponding functions in the foregoing method examples.
  • the units may perform the corresponding functions in the foregoing method examples. For details, refer to the detailed description in the method example, which is not described herein.
  • the embodiment of the present application further provides a device for inter-system interoperability, which has the function of implementing the behavior of the first access management network element in the foregoing method example.
  • the functions may be implemented by hardware or by corresponding software implemented by hardware.
  • the hardware or the software includes one or more modules corresponding to the functions described above.
  • the structure of the device includes a receiving unit, a sending unit, and a processing unit, and the units may perform corresponding functions in the foregoing method examples.
  • the units may perform corresponding functions in the foregoing method examples.
  • the detailed description in the method example which is not described herein.
  • the embodiment of the present application further provides a terminal, where the terminal has a function of implementing terminal behavior in the method example of the foregoing first aspect.
  • the functions can be implemented in hardware.
  • the structure of the terminal includes a communication interface, a processor, and a memory, and the processor calls an instruction stored in the memory to execute the above method.
  • the embodiment of the present application further provides an access management network element, where the access management network element has the function of implementing the behavior of the access management network element in the foregoing method of the second aspect.
  • the functions can be implemented in hardware.
  • the structure of the terminal includes a communication interface, a processor, and a memory, and the processor calls an instruction stored in the memory to execute the above method.
  • the embodiment of the present application further provides a computer storage medium, where the software program stores a software program, where the software program can implement the first aspect or the first one when being read and executed by one or more processors. Any of the aspects provided by the design.
  • the present application also provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform the inter-system interoperability method described in the above aspects or various possible implementations.
  • the embodiment of the present application further provides A heterogeneous system interoperation method, the method comprising: a first access management network element of a first communication network first determining that a terminal has registered with the first communication network and a second communication network; and then the first access management The network element sends a fourth message from the terminal to the session management network element of the first communication network, where the fourth message is used to request to establish a session, and the fourth message includes the first access management network.
  • the session management network element of the visited place needs to inform the session management network element of the home location to support the single registration, and the session management network element of the home location knows the situation and is in the PDU session.
  • the corresponding home network SM context needs to be established. For example, in the 5G to 4G handover process, the AMF can transmit the established 4G SM context to the MME through the N26 interface to ensure the continuity of the terminal service.
  • the embodiment of the present application further provides a method for inter-system interoperation, the method includes: the session management network element of the first communication network first determines that the terminal has completed registration in the first communication network and the second communication network, where The session management network element supports the first communication network and the second communication network, and then the session management network element receives a fourth message from a first access management network element of the first communication network.
  • the fourth message is used to request to establish a session, and the fourth message includes the first access management network element supporting a registration capability of a single network in the first communication network; finally, the session management network element is The first access management network element sends a response message of the fourth message, where the response message includes session management context information of the terminal in the second communication network.
  • the method further includes:
  • the session management network element sends a fifth message to the policy control network element, where the fifth message includes the first access management network element supporting the registration capability of the single network in the first communication network;
  • the session management network element receives a response message from the fifth message of the policy control network element, and the response message of the fifth message includes a policy and charging control PCC of the terminal in the first communication network. Rules and PCC rules of the terminal in the second communication network. The purpose of this is that the session management network element notifies the other network elements in time to support the registration capability of the single registration.
  • the session management network element first generates the terminal according to a PCC rule of the terminal in the first communication network and a PCC rule of the terminal in the second communication network. a first quality of service parameter of the first communication network and a second quality of service parameter of the terminal in the second communication network; the session management network element then transmitting the first to the first access management network element The quality of service parameter and the second quality of service parameter.
  • the purpose of this is that the session management network element feeds back the information about the registration capabilities of other network element support single registrations to the access management network element in time.
  • the visited session management network element first sends a sixth message to the home session management network element in the first communication network, where the sixth message includes the first access
  • the management network element supports the registration capability of the single network in the first communication network; then the visited session management network element receives the response message of the sixth message from the home session management network element, and the response message of the sixth message is Include the session management context information of the terminal in the second communication network, so that the visited session management network element can obtain the session management context information required by the terminal from the home session management network element, thereby smoothly starting from the first
  • the communication network migrates to the second communication network.
  • the embodiment of the present application further provides a heterogeneous system interoperation method, where the method includes: the policy control network element of the first communication network first determines that the terminal has completed registration in the first communication network and the second communication network, The policy control network element receives a fifth message sent by the session management network element of the first communication network, where the fifth message is used to request to send policy information, and the fifth message includes the first interface
  • the management network element supports the registration capability of the single network in the first communication network, and the policy control network element sends a response message of the fifth message to the session management network element, where the response message of the fifth message includes A policy and charging control PCC rule applicable to the first communication network and a PCC rule applicable to the second communication network.
  • the purpose of this is also to ensure that the interoperation is normal when the UE is roaming, and the UE supports dual registration on the home network, but the visited network of the UE supports single registration.
  • the embodiment of the present application further provides a method for inter-system interoperation, the method comprising: receiving, by an access management network element of a first communication network of a visited place of a terminal, a terminal from the terminal a seventh message, the seventh message is used to establish a packet data unit session; the access management network element of the first communication network of the visited place determines an interoperability of the first communication network of the visited place; the visit The access management network element of the first communication network of the ground sends an eighth message to the first communication network of the home location of the terminal, where the eighth message is used to establish the packet data unit session, and the eighth message includes The interoperability.
  • the access management network element of the first communication network of the visited location determines the interoperability of the first communication network of the visited place, including: the visit
  • the access management network element of the first communication network of the ground has an interface between the access management network element of the first communication network of the visited place and the access management network element of the second communication network of the visited place. The ability of the first communication network of the visited place to support single-network registration of the terminal.
  • the method further includes: an access management network element of the first communication network of the visited place receives, from a first communication network of the home location, a first communication network and a location of the terminal addressed to the terminal at the visited place The first session management context information in the second communication network of the visited place.
  • the method further includes: receiving, by the access management network element of the first communication network of the visited place, the terminal of the access network device that is sent to the first communication network of the visited place from the first communication network of the home location The first communication network of the visited place and the second session management context information of the second communication network of the visited place.
  • the access management network element of the first communication network of the visited location determines the interoperability of the first communication network of the visited location, including: the visit The access management network element of the first communication network of the ground determines that there is no interface between the access management network element of the first communication network of the visited place and the access management network element of the second communication network of the visited place.
  • the first communication network of the visited place supports the terminal's ability to register with a dual network.
  • the method further includes: the access management network element of the first communication network of the visited place receives the session management context information of the terminal in the first communication network of the visited place only from the first communication network of the home location.
  • the method further includes: the access management network element of the first communication network of the visited place sends the indication information to the access network device of the first communication network of the visited place, where the indication information is used to indicate the number of the visited place The ability of a communication network to support dual network registration for the terminal.
  • the embodiment of the present application further provides a method for inter-system interoperation, the method comprising: a session management network element of a first communication network of a home location of a terminal receiving a first communication of a visited place of the terminal An eighth message sent by the access management network element of the network, the eighth message is used to establish a packet data unit session, and the eighth message includes an interoperation capability of the first communication network of the visited place; the session management The network element sends a response message of the eighth message to the access management network element of the first communication network of the visited place.
  • the interoperability capability includes an ability of the first communication network of the visited place to support a single network registration of the terminal.
  • the response message of the eighth message includes: the first communication network that is sent to the terminal at the visited place and the first visited network The first session management context information in the second communication network.
  • the response message of the eighth message includes: the terminal of the access network device that is sent to the first communication network of the visited place at the visited place The second communication management context information in the first communication network and the second communication network of the visited place.
  • the interoperability includes an ability of the first communication network of the visited place to support dual network registration of the terminal.
  • the response message of the eighth message includes: session management context information of the terminal only in the first communication network of the visited place.
  • the response message of the eighth message includes indication information, where the indication information is used to indicate that the first communication network of the visited place accesses the visited place The network device sends the interoperability.
  • the embodiment of the present application further provides an apparatus for inter-system interoperation, including: a transceiver unit, configured to receive a seventh message from a terminal, where the seventh message is used to establish a packet data unit session; a unit, configured to determine an interoperability of the first communication network of the visited place of the terminal; the transceiver unit is further configured to send an eighth message to the first communication network of the home location of the terminal, the eighth message And for establishing the packet data unit session, the eighth message includes the interoperability.
  • a transceiver unit configured to receive a seventh message from a terminal, where the seventh message is used to establish a packet data unit session
  • a unit configured to determine an interoperability of the first communication network of the visited place of the terminal
  • the transceiver unit is further configured to send an eighth message to the first communication network of the home location of the terminal, the eighth message And for establishing the packet data unit session, the eighth message includes the interoperability.
  • the processing unit determines that the interface exists between the device that interoperates with the different system and the access management network element of the second communication network of the visited place. The ability of the first communication network of the visited place to support single-network registration of the terminal.
  • the transceiver unit is further configured to receive, by the first communication network of the home location, the first terminal that is sent to the terminal at the visited place The first session management context information in the communication network and the second communication network of the visited place.
  • the transceiver unit is further configured to receive, by the first communication network of the home location, an access network device that is sent to the first communication network of the visited place And the second session management context information of the terminal in the first communication network of the visited place and the second communication network of the visited place.
  • the processing unit determines that there is no interface between the device that interoperates with the different system and the access management network element of the second communication network of the visited place
  • the first communication network of the visited place supports the terminal's ability to register with a dual network.
  • the transceiver unit is further configured to receive only the session of the terminal sent by the first communication network of the home location in the first communication network of the visited place Manage context information.
  • the transceiver unit is further configured to send the indication information to the access network device of the first communication network of the visited location, where the indication information is used to indicate the visit The ability of the first communication network of the ground to support dual network registration for the terminal.
  • the embodiment of the present application further provides an apparatus for interoperating with different systems, including: a transceiver unit and a processing unit, where the processing unit is configured to receive, by using the transceiver unit, a first communication network of a visited place of the terminal.
  • the eighth message sent by the access management network element, the eighth message is used to establish a packet data unit session, and the eighth message includes interoperability of the first communication network of the visited place; And transmitting, by the transceiver unit, a response message of the eighth message to an access management network element of the first communication network of the visited place.
  • the interoperability capability includes an ability of the first communication network of the visited place to support a single network registration of the terminal.
  • the response message of the eighth message includes the first communication network of the terminal addressed to the terminal at the visited place and the second visited place The first session management context information in the communication network.
  • the response message of the eighth message includes the terminal of the access network device that is sent to the first communication network of the visited place at the visited place A communication session and second session management context information in the second communication network of the visited place.
  • the interoperability capability includes an ability of the first communication network of the visited place to support dual network registration of the terminal.
  • the response message of the eighth message includes: session management context information of the terminal only in the first communication network of the visited place.
  • the response message of the eighth message includes indication information, where the indication information is used to indicate that the first communication network of the visited place accesses the visited place The network device sends the interoperability.
  • a sixteenth aspect of the present application provides an apparatus for inter-system interoperability, comprising: a memory and a processor; the memory for storing program instructions; and the processor for calling the memory stored in the memory
  • the embodiment of the present application further provides a computer storage medium, where the software program stores a software program, and when the software program is read and executed by one or more processors, the first aspect, the foregoing The method provided by any one of the nine aspects, the tenth aspect to the thirteenth aspect.
  • the present application also provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform the different system interoperability methods described in the above aspects or various possible implementations.
  • the terminal sends the network capability of the network to the network side in advance, and the network side feedbacks the interoperability support status of the network side according to the network capability of the terminal.
  • the corresponding policy can be timely implemented according to the network side interoperation support situation, that is, when the terminal determines that the network side supports the interoperation, the current first communication network can be used to obtain the subscription context information of the UE of the target second communication network, and then migrate.
  • the terminal determines that the network side does not support, it will not continue to try in the current first communication network, but directly initiate registration to the target second communication network, thereby achieving the purpose of reducing the delay and ensuring the continuity of the terminal service.
  • FIG. 1 is a schematic diagram of a heterogeneous system interoperation architecture according to an embodiment of the present application
  • FIG. 2 is a schematic diagram of a method for inter-system interoperation in a registration process according to an embodiment of the present application
  • FIG. 3 is a schematic diagram of a method for inter-system interoperation in a session establishment process according to an embodiment of the present application
  • FIG. 4 is a schematic diagram 1 of a method for interoperating different systems according to an embodiment of the present application.
  • FIG. 5 is a second schematic diagram of an inter-system interoperation method according to an embodiment of the present application.
  • FIG. 6 is a schematic diagram of a method for interoperating different systems according to another aspect of the present disclosure.
  • FIG. 7 is an interaction diagram of a different system interoperation method according to another aspect of the present disclosure.
  • FIG. 8 is an interaction diagram 3 of an inter-system interoperation method according to an embodiment of the present application.
  • FIG. 9 is a schematic structural diagram of an apparatus for inter-system interoperability on a terminal side according to an embodiment of the present disclosure.
  • FIG. 10 is a schematic structural diagram of an apparatus for inter-system interoperation of an access management network element side according to an embodiment of the present disclosure
  • FIG. 11 is a schematic structural diagram of a terminal according to an embodiment of the present application.
  • FIG. 12 is a schematic structural diagram of an access management network element according to an embodiment of the present disclosure.
  • FIG. 13 is a schematic structural diagram of an apparatus for inter-system interoperation of an access network element side according to an embodiment of the present disclosure
  • FIG. 14 is a schematic structural diagram of an apparatus for inter-system interoperation of a session management network element side according to an embodiment of the present disclosure
  • FIG. 15 is a schematic structural diagram of an apparatus for inter-system interoperation of a policy control network element side according to an embodiment of the present disclosure
  • FIG. 16 is a schematic structural diagram of an access management network element corresponding to the inter-system interoperation method of FIG. 6 according to an embodiment of the present disclosure
  • FIG. 17 is a schematic structural diagram of a session management network element corresponding to the inter-system interoperation method of FIG. 6 according to an embodiment of the present disclosure
  • FIG. 18 is a schematic structural diagram of a policy control network element corresponding to the inter-system interoperation method of FIG. 6 according to an embodiment of the present application;
  • FIG. 19 is a schematic diagram of a different system interoperation method provided in a roaming scenario according to an embodiment of the present application.
  • FIG. 20 is a schematic diagram of an apparatus for inter-system interoperation according to an embodiment of the present application.
  • the terminal involved in the present application may include a handheld device having a wireless communication function, an in-vehicle device, a wearable device, a computing device, or other processing device connected to the wireless modem, and various forms of user equipment (UE), Mobile station (MS), terminal, terminal equipment, and the like.
  • UE user equipment
  • MS Mobile station
  • terminal equipment terminal equipment
  • terminal equipment terminal equipment
  • FIG. 1 is a schematic diagram of a non-roaming scenario architecture in which a 5G system and a 4G system are interoperable according to an embodiment of the present application.
  • the 4G system in the system architecture includes: an evolved universal terrestrial radio access network (EUTRAN), a mobility management entity (MME), and a serving gateway (serving).
  • EUTRAN evolved universal terrestrial radio access network
  • MME mobility management entity
  • serving gateway serving gateway
  • 5G systems include: fifth generation radio access network (5G RAN), access and mobility management function (AMF), user plane function User plane function (UPF), session management function (SMF), policy and charge function (PCF), home subscriber server (HSS), and so on.
  • 5G RAN fifth generation radio access network
  • AMF access and mobility management function
  • UPF user plane function User plane function
  • SMF session management function
  • PCF policy and charge function
  • HSS home subscriber server
  • the N26 interface between the AMF and the MME exists is uncertain.
  • LTE MMEs such as some Developed countries or underdeveloped provinces do not support the A6 interface to AMF.
  • the N26 interface is mainly used to transmit the MM context and SM context information of the UE.
  • the AMF cannot send the 4G subscription context information to the MME through the N26 interface, and the UE cannot pass the The 5G system where the AMF is located switches to the 4G system where the MME is located.
  • the UE In order to support the interoperability between the 5G system and the 4G system, the UE needs to support the 5GC NAS and the EPC NAS. If the UE supports only one type of NAS, the interoperability between the 5G system and the 4G system cannot be implemented. Therefore, the UE supports the 5GC NAS and the EPC. NAS is a prerequisite for interoperating 5G systems with 4G systems.
  • the UE can generally support single registration (SR) or dual registration (DR) modes.
  • SR means that the UE has only one active MM (mobility management) state (RM-5GC, EMM-EPC), which means that the UE is either in the 5GC non-access stratum (Non-Access Stratum, NAS).
  • NAS Non-Access Stratum
  • Mode either in EPC NAS mode, ie UE can only be registered in one system.
  • the so-called dual registration means that the UE can only register on the 5GC NAS, or can only register on the EPC NAS, or can be registered in the 5GC NAS mode and the EPC NAS mode at the same time, that is, the UE can be registered only in one system, or Registered in two different systems.
  • the network side network element or the network supports the single network registration capability, including an interface between the AMF network element and the MME network element, for example, an N26 interface.
  • an N26 interface between the AGC of the 5GC and the MME of the EPC:
  • the UE performs the TAU procedure using the 4G-GUTI obtained from the 5G-GUTI mapping, and the MME receives the UE MM context and SM context from the 5GC, and performs the handover process between the systems.
  • the UE performs the registration procedure using the 5G-GUTI obtained from the 4G-GUTI mapping, and the AMF and the SMF receive the UE MM context and SM context from the EPC, and perform inter-system handover. Process.
  • the MME selected by the UE through the EUTRAN may not have an N26 interface with the AMF, or the AMF selected by the UE through the 5G RAN may not have an N26 interface with the MME, when the UE is in the single registration mode:
  • the UE For the mobile in the idle state from 5GC to EPC, the UE first needs to try TAU to 4G. In the process, the MME finds that the 4G GUTI according to the 5G GUTI mapping finds the AMF, but the MME does not exist with the AMF. The N26 interface then rejects the TAU process and carries the "Handover PDN Connection Setup Support" indication message to the UE in the Registration Accept message.
  • the UE initiates the registration process using the 4G GUTI mapped from the 5G GUTI.
  • the AMF finds that the MME is found through the 5G GUTI, so the mobile registration process is rejected and carries the “Handover”.
  • PDU Session Setup Support indicates information to the UE.
  • the UE when the UE supports the single registration mode, and the NGC interface does not exist between the AMG of the 5GC and the MME of the EPC, the UE first tentatively performs a TAU (tracking area update) request, and then performs a Registration Request after being rejected.
  • TAU tracking area update
  • the embodiment of the present application provides a heterogeneous system interoperation method, which can simplify the inter-system interoperation process and implement a fast interoperation process.
  • FIG. 2 is a schematic diagram of a method for inter-system interoperation in a registration process according to an embodiment of the present disclosure, where the method includes:
  • Step 201 The terminal sends a first message to the first access management network element of the first communications network, where the first message includes first indication information and second indication information, where the first indication information indicates that the terminal supports a first NAS and a second NAS, the second indication information indicating that the terminal supports a single network registration capability;
  • Step 202 The first access management network element sends a first response message of the first message to the terminal, where the first response message includes the second access management of the first access management network element and the second communication network. Whether there is support information for the interface between NEs;
  • Step 203 The terminal determines, according to the first response message, whether the interface exists between the first access management network element and the second access management network element.
  • Step 204 The terminal determines that the interface does not exist, and sends a registration request message to the second access management network element, where the registration request message is used to request registration to the second communication network, where the registration request message is The handover indication information is used to indicate that the second access management network element establishes a session in the registration process.
  • the first NAS mode may be a 5GC NAS
  • the second NAS mode may be an EPC NAS.
  • the first communication network is It is a 4G system
  • the second communication network is a 5G system
  • the first NAS mode can be an EPC NAS
  • the second NAS mode can be a 5GC NAS.
  • the AMF of the first access management network element, the second access management network element refers to the MME
  • the access network device refers to The 5G RAN
  • the interface refers to the N26 interface.
  • the first communication network is a 4G system
  • the second communication network is a 5G system
  • the first access management network element refers to the MME and the second access management.
  • the network element refers to the AMF
  • the access network equipment refers to the E-UTRAN
  • the interface still refers to the N26 interface.
  • the so-called single-network registration capability means that the terminal can only access the 5GC NAS or EPC NAS mode at the same time, or the network registration capability refers to that the terminal can only register to the 5G system or 4G at the same time. system.
  • the foregoing inter-system interoperation method can be described as: the UE sends a Registration Request message to the AMF.
  • the registration request message further includes the network capability parameter of the UE, for example, including the UE support single registration mode, and the UE supports the EPC NAS and the 5GC NAS, and the AMF sends a Registration Accept message to the UE, where the Registration Accept message is Whether the AMF has the support information of the N26 interface with the MME, so that the UE can know the support for the interoperation of the 4G in the network, that is, if the AMF does not support the N26 interface, in the IDLE state, the 5G is During the 4G migration process, the UE initiates an Attach Request message to the MME of the 4G system, and carries the handover indication information in the Attach Request message, instructing the MME to establish a PDN connection during the registration process.
  • the foregoing inter-system interoperation method can be described as: the UE sends an Attach Request message to the MME.
  • the Attach Request message further includes a network capability parameter of the UE, for example, including a UE support single registration mode, and the UE supports the EPC NAS and the 5GC NAS, and the MME sends an Attach Accept message to the UE, where the Attach Accept message is
  • the MME includes the support information of the N26 interface with the AMF, so that the UE can know the support for the interoperation of the 5G in the network, that is, if the MME does not support the N26 interface, in the IDLE state, the 4G is
  • the UE directly sends a Registration Request message to the AMF of the 5G system, and carries the handover indication information in the Registration Request message, instructing the AMF to establish a PDU session during the registration process.
  • the terminal first sends an RRC (Radio Resource Control) setup request message to the access network device, where the RRC setup request message includes the first message, and the access network device discovers that the terminal only supports the single registration mode and has support.
  • RRC Radio Resource Control
  • the capability of the EPC NAS and the 5GC NAS is preferred to the access management network element having the N26 interface. It should be noted that the terminal sends an RRC setup request message to the access network device, and the access network device can only perceive the configuration in the message. The content of the parameters, the configuration parameters are transparent to the access network device.
  • the first response message further includes whether the user data management network element selected by the first access management network element supports the information of the second communication network, if the An access management network element is the AMF network element, and the AMF network element selects a UDM network element that supports the HSS network element function as much as possible according to the two indication information; or, if the first access management network element For the MME network element, the MME network element selects an HSS network element supporting the UDM network element function as much as possible according to the two indication information.
  • the AMF preferentially selects a UDM network element supporting the HSS function according to the first indication information and the second indication information, so that the MME can obtain the HSS function through the AMF.
  • the MM context and the SM context information of the UE so as to implement the migration from the 5G system to the 4G system.
  • the MME preferentially selects an HSS network element supporting the UDM function according to the first indication information and the second indication information, so that the AMF can obtain the MM context and the SM context information of the UE from the UDM function through the MME, thereby implementing migration from the 4G system.
  • the UDM function is not supported, the MM context and SM context information cannot be obtained smoothly.
  • the AMF selected by the UE during the registration process supports the N26 interface
  • the AMF selected UDM network element does not support the HSS function
  • the MME selected by the UE during the registration process supports the N26 interface
  • the MME selects If the HSS network element does not support the UDM function, it will affect the UE's migration behavior between different systems.
  • the UE may directly initiate a registration request to the target network. Switching can be initiated with low latency to ensure continuity of terminal services.
  • the AMF does not select the SMF that supports the PGW-C function during the establishment of different PDU sessions.
  • the SMF does not select the PCF that supports the PCRF and the UPF that supports the PGW-U.
  • the default service flow in the session and the dedicated GBR service flow are not switched to the 4G system, or conversely, during the PDN connection establishment process, the MME cannot select the SMF supporting the PGW-C, and the PGW-C+SMF cannot select.
  • Supporting the PCF function of the PCRF and the PGW-U function supporting the UPF will result in the corresponding default bearer and the dedicated GBR bearer switching to less than the 5G system.
  • the embodiment of the present application further provides a method for inter-system interoperation in the session establishment process. As shown in FIG. 3, the method includes:
  • Step 301 The terminal sends a session establishment request message to the first access management network element.
  • Step 302 The first access management network element sends a session establishment accept message to the terminal, where the session establishment accept message includes the session management network element, the policy control network element, and the user plane network element in the first communication network. At least one of the information supports the information of the second communication network.
  • Step 303 The terminal determines whether at least one of the session management network element, the policy control network element, and the user plane network element in the first communication network supports the second communication network.
  • Step 304 When the terminal determines that at least one of the support information is no, the terminal sends a registration request message to the second access management network element, where the registration request message is used to request registration to the second communication network.
  • Step 305 When the terminal determines that the support information is yes, the MM context and the SM context information that are sent by the first access management network element to the UE of the second access management network element are migrated to the second Communications network.
  • the first case is: if the first access management network element is an AMF network element, the terminal sends a PDU session establishment request message to the AMF network element, and the AMF network element sends the PDU to the terminal.
  • a session establishment accept message wherein at least one of the session management network element, the policy control network element, and the user plane network element included in the PDU session establishment accept message supports information of the second communication network, which mainly includes the following three At least one of the types of support information:
  • the first support information is whether the SMF network element selected by the AMF network element supports the PGW control plane function
  • the second support information is whether the PCF network element selected by the SMF network element supports the PCRF network element function
  • the third support information is Whether the UPF network element selected by the SMF supports the PGW user plane function.
  • the second case is: if the first access management network element is the MME network element, the terminal sends a PDN session establishment request message to the MME network element, and the MME network element sends a PDN session establishment accept message to the terminal.
  • the at least one of the session management network element, the policy control network element, and the user plane network element included in the PDN session establishment accept message supports the information of the second communication network, and mainly includes the following three types of support information. At least one:
  • the first support information is whether the PGW control plane selected by the MME network element supports the SMF network element function
  • the second support information is whether the PCRF network element selected by the SMF network element supports the PCF network element function
  • the third support information is Whether the PGW user plane selected by the SMF supports the UPF network element function.
  • Embodiment 2 Corresponding to the registration process of FIG. 2 of Embodiment 1, a possible implementation manner for the UE to switch from the 5G system to the 4G system
  • FIG. 4 is an interaction diagram of a different system interoperation method according to Embodiment 2 of the present application, and the specific content is as follows.
  • Step 401 The UE sends an AN (Access) message to the 5G RAN, where the message carries AN parameters (AN parameters) and RM-NAS Registration Request (RM-NAS Registration Request) information.
  • AN parameters AN parameters
  • RM-NAS Registration Request RM-NAS Registration Request
  • the RM-NAS registration request includes the first indication information that the UE needs to maintain the single registration mode when the inter-system interoperation is performed, and the second indication information that supports the 5G NAS and the 4G NAS, and the first indication information and the second The indication information may indicate that the UE needs to maintain IP address continuity.
  • the RM-NAS Registration Request information includes a registration type, and the initial registration process, that is, the registration type, is filled with "initial registration", indicating that the UE may have the following status.
  • a “mobility registration update” process that is to say, the UE has already registered, which is the registration process initiated by the UE moving to another location area.
  • the UE initiates the initial registration to a PLMN, if there is no 5G GUTI, the UE needs to provide its own SUPI to the AMF. In other cases, it needs to bring the 5G GUTI to the AMF.
  • the AMF can find the old AMF (old AMF) through the 5G GUTI.
  • Old AMF refers to the AMF assigned by the 5G RAN by default.
  • Step 402 If the parameter included in the AN parameter cannot point to a valid AMF, the 5G RAN selects an AMF based on the (R)AT and the NSSAI, and when the 5G RAN finds the first indication information and the second indication information from the AN parameters, 5G Based on these two indications, the RAN will select an AMF that supports the N26 interface as much as possible. If the 5G RAN cannot select a suitable AMF, the 5G RAN sends the Registration Request message to a locally configured AMF, allowing the AMF to perform a new AMF selection. The so-called new AMF (new AMF) refers to reselection. Non-default assigned AMF.
  • Step 403 The 5G RAN sends an N2 message to the new AMF, where the message carries an N2 parameters (N2 parameter) and an RM-NAS Registration Request (RM-NAS Registration Request), where the N2 parameters parameter includes a location associated with the UE camped cell. Information, cell identity and RAT type.
  • N2 parameter N2 parameters
  • RM-NAS Registration Request RM-NAS Registration Request
  • step 404 the new AMF sends a Namf_Communication_UEContextTransfer message to the old AMF, and requests the UE's SUPI and MM context from the old AMF.
  • Step 405 The old AMF sends a Namf_Communication_UEContextResponse message to the new AMF. If the old AMF has an PDU session that is still active, the old AMF needs to include the SMF identifier corresponding to the PDU session and the PDU session identifier in the SMF information and send it to the new AMF.
  • Step 406 If the UE or the old AMF does not provide the SUPI parameter, the new AMF sends an Identity Request message to the UE requesting the SUPI.
  • Step 407 The UE sends an Identity Response message to the AMF, where the message carries the SUPI of the UE.
  • step 408 the AMF decides to trigger an AUSF, in which case the UE selects an AUSF based on the SUPI.
  • Step 409 the authentication and security steps, will not be repeated here.
  • Step 410 If the AMF changes, the new AMF triggers the Namf_Communication_RegistrationCompleteNotify service operation, and notifies the old AMF that the UE completes the registration to the new AMF. If the authentication and security steps fail, new AMF will reject the Registration Request and trigger the Namf_Communication_RegistrationCompleteNotify service operation, report the rejection reason to the old AMF, and then the old AMF continues to serve the UE.
  • Step 411 If the UE or the old AMF does not provide the PEI to the new AMF, the AMF requests the UE to obtain the PEI through the Identity Request message.
  • Step 412 optionally, the AMF triggers the N5g-eir_MEIdentityCheck_Get service operation for ME identity verification.
  • step 413 if step 14 is to be performed, the AMF selects a UDM based on SUPI.
  • the AMF initiates a location update service operation, and requests the UE to sign the context information to the UDM. If the new AMF selects the UDM that supports the HSS function, the new AMF needs to send the first indication information and the second indication information of the UE to the Nudm_SubscriptionData_UpdateNotification service operation. After receiving the two indications, the UDM associates with the UE information and stores it locally.
  • the new AMF initiates a Nudm_UEContextManagement_Registration to the UDM. Service operation request. If there is no subscription context of the UE in the new AMF, the corresponding request message needs to include a "subscription data retrieval indication" indication information.
  • the UDM will initiate a Nudm_SubscriptionData_UpdateNotification service operation response to the new AMF, and carry the UE's subscription data in the service operation response.
  • New AMF will generate an MM context based on the UE's subscription data.
  • step 415 the AMF selects a PCF based on the SUPI.
  • Step 416 If the new AMF does not acquire the access and mobility policy of the UE, or if the access and mobility policies in the new AMF are no longer valid, the AMF initiates a Npcf_PolicyControl_PolicyCreate service operation request to the PCF to create a policy to the PCF. Control the session.
  • the PCF provides the UE's access and mobility policy data to the new AMF by initiating a response to the new AMF to the Npcf_PolicyControl_PolicyCreate service operation request.
  • step 417 the AMF triggers a Namf_EventExposure_Notify service request to the SMF in the following scenarios.
  • the new AMF tells the UE reachability status (including the PDU session status) that each service operates on the SMF of the UE.
  • the SMF will decide whether to reactivate a PDU session based on the PDU session status in the Namf_EventExposure_Notify service operation request.
  • the new AMF If the UE is in the MICO state, and the new AMF receives a notification that the UE is unreachable for the SMF, and the SMF cannot send the downlink data notification to the new AMF, then the new AMF notifies the SMF UE that it is reachable through Namf_EventExposure_Notify.
  • the new AMF notifies the new location information of the SMF UE by Namf_EventExposure_Notify.
  • Step 418 non-3GPP related, and will not be described again here.
  • Step 419 non-3GPP related, and will not be described again here.
  • the old AMF deletes the associated UE context between the UE and the PCF through the Npcf_PolicyControl_PolicyDelete service operation, such as association information between the UE and the old AMF.
  • the new AMF sends a Registration Accept message to the UE, and the new AMF is notified to receive the registration request of the UE.
  • the message carries whether the new AMF supports the third indication information of the N26 interface and whether the UDM supports the fourth indication information of the HSS function.
  • the AMF informs the 5G RAN of the above indication information through the N2 session.
  • Step 422 The UE sends a Registration Complete message to the AMF to respond to the new 5G GUTI allocated by the new AMF for the UE.
  • Step 423 The UE sends the third indication information and the fourth indication information in the Registration Accept message according to the new AMF, and determines that when the New AMF does not support the N26 interface and the UDM does not support any of the HSS functions, the UE resends the message to the E-UTRAN.
  • the Attach Request message is carried, and the handover request message is carried in the Attach Request message, indicating that the UE directly performs the attach procedure in the 4G system.
  • Step 424 the UE sends the third indication information and the fourth indication information in the Registration Accept message according to the new AMF, and determines the subscription context information of the UE that the UE transmits to the MME through the AMF when the New AMF supports the N26 interface and the UDM supports the HSS function.
  • the 5G system is migrated to the 4G system.
  • the UE sends the request to support the single registration mode and the support of the 5G NAS and the 4G NAS to the AMF, and the AMF also feeds back to the terminal whether there is an N26 interface between the AMF and the MME, and whether the UDM network with the HSS function is selected.
  • the UE can know the support situation of the network side corresponding to the inter-system interoperation, and then the UE performs different interoperation policies for different support situations, that is, the UE knows that there is no N26 interface between the AMF and the MME, and the UE The registration can be re-initiated to the 4G system, and then switched to the 4G system without experiencing the TAU Request and the rejection process, thereby reducing the delay in the UE handover process.
  • the MME can obtain the subscription context information of the UE of the 4G system from the AMF through the N26 interface, and then the UE migrates from the 5G system to the 4G system with low latency.
  • Embodiment 3 Corresponding to the session establishment process of Embodiment 1 of FIG. 3, a possible implementation manner for the UE to switch from the 5G system to the 4G system
  • FIG. 5 is an interaction diagram of a different system interoperation method according to Embodiment 3 of the present application, and the specific content is as follows.
  • Step 501 The UE sends a NAS message to the AMF, where the message carries the first indication information that the UE needs to maintain the single registration mode when the inter-system interoperation is performed, and supports the second indication information of the 5G NAS and the 4G NAS, and the first indication information is passed.
  • the second indication information may indicate that the UE needs to maintain IP address continuity.
  • Step 502 The AMF learns that the UE requests to establish a new PDU session by using the “initial request” indication information in the Request Type, and the PDU session ID allocated by the UE is not used by other PDU sessions.
  • the AMF may determine a default S-NSSAI based on the UE's subscription information (from the location update procedure in the UE registration procedure). The AMF selects an SMF and associates the SMF ID with the PDU Session ID and stores it locally.
  • the AMF may continue to select and select an SMF supporting the PGW-C function according to the two indication information.
  • Step 503 the AMF sends the following information information to the SMF through the Nsmf_PDUSession_CreateSMRequest service operation, (1), the AMF ID uniquely identifies the AMF; (2), the AMF sends the PDU session ID from the UE and the N1 SM information including the PDU Session Establishment Request cell. The cells are forwarded together to the SMF; (3) the first indication information and the second indication information.
  • the AMF selects the SMF that supports the PGW-C function in step 502
  • the AMF will carry the first indication information and the second indication information in the Nsmf_PDUSession_CreateSMRequest service operation, instructing the SMF+PGW-C to select a PCRF function as much as possible.
  • Step 504 If the SMF does not receive the SM subscription data associated with the DNN of the UE, the SMF requests the subscription data from the UDM through the Nudm_SubscriberData_GetRequest service operation, and receives the subscription information through the Nudm_SubscriberData_GetResponse.
  • the SMF will detect whether the user subscription information is compatible with the UE request according to the local policy. If it is not compatible, the SMF rejects the SM request and notifies the reason of the AMF rejection through the Nsmf_PDUSession_CreateSMResponse service operation.
  • Step 505 PDU session authentication, which is not described here.
  • Step 506 The SMF obtains the default PCC rules after authorization. If a dynamic PCC policy is deployed, the SMF selects a PCF. If the Nsmf_PDUSession_CreateSMRequest service operation from step 503 has two indication information, the SMF selects a support according to the indication information. PCRF function of PCF.
  • Step 507 the SMF performs preparatory work for establishing some PDU sessions. If the Request Type indicates "Initial request", the SMF selects an SSC mode for the PDU session. If the Nsmf_PDUSession_CreateSMRequest service operation from step 503 has two indications, and the PCF supporting the PCRF function is selected in step 506, the SMF+PGW-C selects a PCF that supports the PGW-U function.
  • Step 508 the SMF informs the PCF of the IP address or IP prefix allocated for the UE.
  • the SMF triggers the Npcf_PolicyControl_PolicyCreateRequest service operation to the PCF, establishes a PDU CAN Session, and obtains the default PCC rules for the corresponding PDU Session.
  • the SMF notifies the PCF of the IP address or IP prefix assigned to the UE. If the SMF in step 6 selects the PCF that supports the PCRF function, the SMF notifies the PCF of the first indication message and the second indication information through the Npcf_PolicyControl_PolicyCreateRequest.
  • step 509 if the Request Type indicates "Initial Request" and the step 505 is not performed, the SMF initiates an N4 Session establishment process to the UPF selected in the step 507. Otherwise, the SMF initiates an N4 Session modification process to the UPF.
  • the SMF sends an N4 Session Establishment/Modification Request message to the UPF, and provides the packet detection, enforcement, and reporting rules required for establishing the PDU session to the UPF.
  • the SMF allocates the CN Tunnel Info, the tunnel information needs to be carried. Give UPF.
  • the UPF sends an N4 Session Establishment/Modification Response to the SMF. If the UPF is assigned a CN Tunnel Info, the tunnel information needs to be brought to the UPF.
  • the SMF in step 507 selects the UPF that supports the PGW-U function, the SMF notifies the PCF of the first indication information and the second indication information through the N4 session creation/correction request message.
  • Step 510 The SMF brings the following information to the AMF by using the Nsmf_PDUSession_CreateSM Response service operation. If the SMF receives two indication information in step 503, the SMF will create N1 SM information and N2 SM information in the Nsmf_PDU session_create SM response service operation. The third indication information and the fourth indication information are filled in, the third indication information indicates whether the selected PCF supports the PCRF function, and the fourth indication information indicates whether the selected UPF supports the PGW-U function information, and then the third indication information and the fourth indication information The instructions inform the AMF.
  • the Nsmf_PDUSession_CreateSM Response service operation also contains information:
  • -N2 SM information is transparent to AMF and forwarded by AMF to RAN
  • -CN Tunnel Info is the UPF tunnel information assigned by the UE.
  • This step can send multiple QoS profiles to the RAN
  • -N1 SM information is also transparent to AMF and forwarded to the UE by AMF
  • N1/N2 SM information may be included in N1/N2 SM information
  • Step 511 The AMF sends an N2 PDU session request message to the RAN, where the message includes the N2 SM information and the NAS message, where the NAS message includes the PDU session ID and the PDU session establishment accepting cell in the N1 SM information.
  • the RAN may establish a specific signaling interaction between the specific AN and the UE, and bring some N1 SM information received from the SMF to the UE. For example, if it is 3GPP, the RAN sends an RRC Connection Reconfiguration message.
  • the UE establishes a wireless air interface resource, and sends an authorized QoS rule of the PDU session obtained in step 510 to the UE.
  • Step 513 The RAN sends an N2 PDU Session Response message to the AMF, where the message carries the tunnel information of the RAN, and finally sends the information to the UPF for data forwarding.
  • step 514 the AMF forwards the N2 SM information to the SMF through the Nsmf_PDUSession_UpdateSMContext Request service operation.
  • step 515 the SMF sends the tunnel information of the CN (from the SMF, step 508) and the 5G RAN to the UPF.
  • the SMF sends an N4 session establishment request message to the UPF. Otherwise, the SMF sends an N4 session modification request message to the UPF, and the SMF sends the tunnel information of the AN and the CN to the UPF, where the CN tunnel information is only SMF. When the CN tunnel information is selected, it needs to be sent to the UPF.
  • the UPF sends an N4 session creation/correction response message to the SMF.
  • Step 516 the SMF informs the SMF that the SMF has been prepared for the PDU session to be established through the Nsmf_PDUSession_UpdateSMContext Response service operation, and then the AMF may forward the SMF related information to the SMF, such as the RAN tunnel information update or the AMF weight. Orientation.
  • Step 517 If the PDU type is IPv6, the SMF sends an IPv6 route notification to the UE through the UPF.
  • Step 518, step 18 involves non-3GPP, and details are not described herein.
  • Step 519 If the SMF ID is not brought to the UDM in the DNN subscription context in step 4b, the SMF triggers the Nudm_UEContextManagement_Registration (Nudm_UE Content Management Registration) service operation, and sends the SMF address information and the DNN to the UDM.
  • the UDM stores the SMF ID, the address, and the DNN associated with it.
  • the SMF needs to inform the AMF.
  • the SMF will automatically receive the notification message of the N1 signaling associated with the PDU session ID of the UE, and the notification message will also carry the location, access type, etc. of the UE from the RAN. information.
  • Step 520 The AMF determines, according to the third indication information and the fourth indication information in the N1/N2 SM information returned by the SMF, that the PCF does not support the PCRF function information, and the selected UPF does not support the PGW-U function, and the UE returns through the RAN according to the AMF.
  • the session response message when the AMF does not support the indication information of the PGW-C and the PCF network element does not support the PCRF function, and the UPF network element does not support any of the PGW-U functions, the UE re-sends the Attach Request to the E-UTRAN.
  • the registration request message is carried, and the handover request information is carried in the Attach Request message, instructing the UE to perform the attach procedure directly in the 4G system.
  • Step 521 The UE determines, according to the session response message returned by the RAN by the AMF, that the AMF supports the PGW-C and the PCF network element to support the PCRF function, and the UPF network element supports the PGW-U function, and the UE transmits the subscription context information of the UE to the MME through the AMF. , from 5G systems to 4G systems.
  • the UE sends the request to support the single registration mode and the support of the 5G NAS and the 4G NAS to the AMF, and the AMF also feeds back to the terminal whether there is an N26 interface between the AMF and the MME, and whether the UDM network with the HSS function is selected.
  • the UE can know the support situation of the network side corresponding to the inter-system interoperation, and then the UE performs different interoperation policies for different support situations, that is, the UE knows that there is no N26 interface between the AMF and the MME, and the UE The registration can be re-initiated to the 4G system, and then switched to the 4G system without experiencing the TAU Request and the rejection process, thereby reducing the delay in the UE handover process.
  • the MME can obtain the subscription context information of the UE of the 4G system from the AMF through the N26 interface, and then the UE migrates from the 5G system to the 4G system with low latency.
  • the UE, the radio side, and the network side support the interoperability support during the PDU session establishment process, and help the UE successfully complete the inter-system interoperation. Because the UE has notified the IP address consecutively, supports the single registration, and supports the capability parameters of the 5G NAS and the 4G NAS to the network side during the registration process, the network side passes the PDU during the PDU session establishment/PDN connection establishment initiated by the UE.
  • the session response message informs the UE/RAN/AMF whether SMF+PGW-C, SMF+PGW-C has been selected, and whether PCF+PCRF and UPF+PGW-U are selected.
  • the UE determines that the network side does not support interoperation, it re-registers with the 4G system. Otherwise, the N6 interface can obtain the 4G system from the AMF through the N26 interface. The UE's subscription context information, and then the UE migrates from the 5G system to the 4G system with low latency. Obviously, this can save the existing TAU process, simplify the signaling interaction process of the inter-system interoperability, and improve the inter-system interoperability. effectiveness.
  • FIG. 6 is a schematic diagram of a method for interoperating different systems according to an embodiment of the present application, where the method includes:
  • Step 601 The UE sends a session establishment request message to the first access management network element of the first communication network, where the session establishment request message includes a network registration capability that the UE supports dual registration in the first communication network and the second communication network.
  • Step 602 The first access management network element of the first communication network determines, according to the session establishment request sent by the terminal, that the terminal has been registered in the first communication network and the second communication network.
  • Step 603 The first access management network element forwards the session establishment request message to the session management network element, and carries the registration capability of the self-support single network in the forwarded message;
  • Step 604 The session management network element sends a response message of the fourth message to the first access management network element, where the response message of the fourth message includes the session of the terminal in the second communication network. Manage context information.
  • Step 605 The first access management network element forwards the session establishment accept message to the terminal.
  • Step 606 The terminal switches to the second communication system according to the session management context information in the session establishment accept message.
  • the first NAS mode may be a 5GC NAS
  • the second NAS mode may be an EPC NAS.
  • the first communication network is It is a 4G system
  • the second communication network is a 5G system
  • the first NAS mode can be an EPC NAS
  • the second NAS mode can be a 5GC NAS.
  • the AMF of the first access management network element, the second access management network element refers to the MME
  • the access network device refers to The 5G RAN
  • the interface refers to the N26 interface.
  • the first communication network is a 4G system
  • the second communication network is a 5G system
  • the first access management network element refers to the MME and the second access management.
  • the network element refers to the AMF
  • the access network equipment refers to the E-UTRAN
  • the interface still refers to the N26 interface.
  • the UE when the UE switches from the 5G system to the 4G system for interoperation, the UE sends a session establishment request message to the AMF network element, and the session establishment request message carries the mode that the terminal is dual-registered in the 4G system, so that the AMF informs
  • the session management network element of the home site supports the single registration.
  • the session management network element of the local area knows the situation, the corresponding 4G network SM context is established, and the AMF can transmit the established 4G SM context to the MME through the N26 interface, so that the UE It is possible to perform the process of migrating from a 5G system to a 4G system.
  • the UE when the UE switches from the 4G system to the 5G system for interoperation, the UE sends a session establishment request message to the MME network element, and the session establishment request message carries the mode that the terminal is dual-registered in the 5G system, so that the MME informs
  • the session management network element of the home site supports the single registration.
  • the MME can transmit the established 5G SM context to the AMF through the N26 interface, so that the UE It is possible to perform the process of migrating from a 4G system to a 5G system.
  • Embodiment 4 Corresponding to the session establishment process of FIG. 6, a possible implementation manner for the UE to switch from the 5G system to the 4G system
  • FIG. 7 is an interaction diagram of a different system interoperation method according to Embodiment 4 of the present application, where RAN, AMF, V-UPF, and V-SMF are in a visited network, H-UPF, H-SMF, H-PCF, UDM
  • the network element is in the home network. The details are as follows.
  • Step 701 The UE sends a NAS message to the AMF, where the message carries the S-NSSAI, the DNN, the PDU session ID, the Request type, and the N1 SM information.
  • Step 702 The AMF learns that the UE requests to establish a new PDU session by using the “initial request” indication information in the Request Type, and the PDU session ID allocated by the UE is not used by other PDU sessions, and the AMF selects the visited 5G network V- At the same time as the SMF, a home 4G network H-SMF will be selected.
  • Step 703 The AMF sends an SM request carrying a session creation request to the selected visited network V-SMF, for requesting SM context information of the UE in the 5G system.
  • Step 704 The V-SMF performs preparatory work for establishing a PDU session. If the Request Type indicates "Initial request", the V-SMF selects an SSC mode for the PDU session, and selects the PCF that supports the PCRF function.
  • step 705 the V-SMF initiates an N4 Session establishment process to the selected V-UPF.
  • the V-SMF sends an N4 Session Establishment Request message to the UPF, and provides the Packet detection, enforcement and reporting rules required for establishing the PDU Session to the UPF.
  • the SMF allocates the CN channel. Information, correspondingly the tunnel information also needs to be brought to the UPF.
  • the UPF sends an N4 Session Establishment Response message to the V-SMF. If the UPF allocates the CN Tunnel Info, the tunnel information needs to be brought to the UPF.
  • Step 706 The V-SMF forwards a PDU session request to the home H-SMF, and informs the home H-SMF of the support for the single registration by the request.
  • step 707a and step 707b the H-SMF requests the UDM to subscribe to the SM context, and the UDM feeds back the established 4G SM context information to the H-SMF.
  • Step 708 PDU session authentication, which is not described here.
  • Step 709a and step 709b are the same as step 506a and step 506b in FIG. 5
  • step 710 is the same as step 507 in FIG. 5
  • step 711 is the same as step 508a and step 508b in FIG. 5
  • steps 712a and 712b are the same as step 509a in FIG. And 509b.
  • the H-SMF transmits the established 4G SM context to the V-SMF through a session establishment response message.
  • step 714 the V-SMF transmits the established 4G SM context to the AMF through the session establishment response message, so that the AMF can be subsequently transmitted to the MME through the N26 interface.
  • step 715 to step 722 is substantially the same as step 513 to step 519 in FIG. 5, and therefore will not be further described herein.
  • the process of the UE moving from the 5G system to the 4G system is mainly: the default QoS of the PDU session in the 5GS.
  • the default bearer corresponding to the flow and the GBR QoS flow and the switch to the EPS are switched, and the dedicated bearer corresponding to the non-GBR QoS flow waits until the switch to the EPS, and the dedicated bearer activation process initiated by the PGW is activated in the EPS. Before activation, the data of these non-GBR QoS flows will be sent to the UE through the default bearer.
  • the UE has multiple ongoing PDU sessions, each of which includes at least one default QoS flow, and may also include multiple dedicated QoS flows, which may be GBR or non-GBR.
  • the 4G SM context is prepared, including the QoS parameters corresponding to the default bearer and the GBR dedicated bearer, and the EPS bearer ID, and in these The process is finally brought to the UE and SMF + PGW-C.
  • FIG. 8 is an interaction diagram of a different system interoperation method according to Embodiment 5 of the present application, which corresponds to a possible implementation manner in which a UE switches from a 5G system to a 4G system, and the specific content is as follows.
  • Step 801 The 5G RAN decides that the UE switches from 5G to 4G, and sends a Handover Required to the AMF to the AMF.
  • step 802 the AMF knows that the UE is to be handed over to the E-UTRAN of the heterogeneous system 4G network through the 'Target eNB Identifier' cell.
  • the AMF requests the EPS Bearer Context from the SMF+PGW-C, ie the 4G SM Context.
  • the AMF needs to send a 4G SM Context Request message to all SMFs allocated for the UE.
  • the AMF requests the context from the V-SMF.
  • step 803 the AMF selects an MME and sends a Relocation Request message to it.
  • the control plane and user plane SGW address in the message and the TEID are used to assist the destination MME to select a new SGW.
  • step 804 the MME selects a new SGW to send a Create Session Request message to each PDN connection.
  • step 805 the SGW allocates a local resource and returns a Create Session Response message to the MME.
  • Step 806 The MME sends a Handover Request message to the target eNB to request to allocate bearer resources.
  • the message may include a list of EPS bearer IDs that need to establish radio bearer resources at the eNB.
  • Step 807 The target eNB allocates the corresponding requested resource, and returns a Handover Request Acknowledge message to the MME.
  • Step 808 If the MME decides to perform indirect data forwarding, it sends a Create Indirect Data Forwarding Tunnel Request message to the SGW to the MME.
  • step 809 the MME sends a Relocation Response message to the AMF.
  • Step 810 if indirect data forwarding is performed, the AMF sends the corresponding SGW information to the SMF+PGW-C. SMF+PGW-C then returns a Create Indirect Data Forwarding Tunnel Response to the AMF.
  • the AMF sends a handover command to the source 5G RAN.
  • the source 5G RAN sends a handover instruction message to the UE, instructing the UE to switch to the destination network.
  • the message will contain a transparent container (transparent container) containing some wireless parameters that the destination eNB will send to the source 5G RAN.
  • the UE locally associates the QoS flows corresponding to the already allocated EPS bearer IDs, and deletes the QoS flows without the associated EPS bearer IDs.
  • Step 812 When the UE successfully accesses the target eNB, the target eNB notifies the MME of the handover notification message.
  • Step 813 The target MME sends a modify bearer request message to the SGW for each bearer in the PDU connection that has been established in the UE.
  • the destination MME initiates a bearer context release procedure to release the EPS Bearer context that is not accepted by the eNB/UE. If the SGW receives a downlink packet of an unaccepted bearer, the SGW discards the packet and does not send a downlink data notification to the SGSN.
  • step 814 the SGW sends a bearer relocation to the 4G network to the SMF for each PDN connection.
  • the SMF locally deletes the QoS flow without the EPS bearer ID assigned. Since there is a matching filter in the default QoS flow, the PGW maps the IP flows of these deleted QoS flows to the default QoS flow.
  • step 815 the SMF responds with a modified bearer response.
  • the user plane between the UE/destination eNB/SGW/SMF has been established.
  • step 816 the SGW responds to a Modify Bearer Response message to the MME.
  • Step 817 The SMF initiates an activation process of the dedicated bearer for the non-GBR QoS flow, and re-establishes the non-GBR dedicated bearer corresponding to the non-GBR QoS flows. This step may be initiated by the PCF if the PCC is deployed dynamically.
  • FIG. 9 is A schematic structural diagram of an apparatus for inter-system interoperation provided by the embodiment of the present application, where the apparatus includes: a sending unit 901, and a receiving unit 902, where:
  • the sending unit 901 is configured to send a first message to the first access management network element of the first communications network, where the first message includes first indication information and second indication information, where the first indication information is used to indicate
  • the terminal supports the first non-access stratum NAS of the first communications network and the second NAS of the second communications network, where the second indication information is used to indicate that the terminal supports registration of a single network;
  • the receiving unit 902 is configured to receive the first response message of the first message from the first access management network element, where the response message of the first message includes the first access management network element and the Whether the information of the interface exists between the second access management network elements of the second communication network.
  • the apparatus further includes a determining unit 903, configured to determine that the interface does not exist according to the first response message;
  • the sending unit 901 is further configured to: send a registration request message to the second access management network element, where the registration request message includes handover indication information.
  • the first response message further includes information about whether the user data management network element selected by the first access management network element supports the second communication network.
  • the determining unit 903 is configured to determine, according to the first response message, that the interface does not exist, and/or the user data management network element selected by the first access management network element does not support the Second communication network;
  • the sending unit 901 is further configured to send a registration request message to the second access management network element, where the registration request message includes handover indication information.
  • the sending unit 901 is further configured to initiate a second message to the first access management network element, where the second message is used to request to establish a session;
  • the receiving unit 902 is further configured to receive a second response message from the second message of the first access management network element, where the second response message includes session management in the first communication network. Whether at least one of the network element, the policy control network element, and the user plane network element supports information of the second communication network.
  • the determining unit 903 is configured to determine, according to the first response message, that the interface does not exist, and/or the terminal determines the first communication according to the second response message. At least one of the access management network element, the session management network element, the policy control network element, and the user plane network element in the network does not support information of the second communication network;
  • the sending unit 901 is further configured to send a registration request message to the second access management network element, where the registration request message includes handover indication information.
  • FIG. 10 is a schematic structural diagram of an apparatus for inter-system interoperation according to an embodiment of the present disclosure, where the apparatus includes: a receiving unit 1001, and a sending unit 1002, where:
  • the receiving unit 1001 is configured to receive a first message from the terminal, where the first message includes first indication information and a second indication, where the first indication information is used to indicate that the terminal supports the first communication network. a first non-access stratum NAS and a second NAS of the second communications network, where the second indication information indicates that the terminal supports a single network registration capability;
  • the sending unit 1002 is configured to send a first response message of the first message to the terminal, where the first response message includes a second connection between the first access management network element and the second communication network. Whether there is information about the interface between the management NEs.
  • the device further includes a processing unit 1003, configured to select a user data management network element according to the first message, where the first response message further includes whether the user data management network element supports Information of the second communication network.
  • the receiving unit 1001 is further configured to receive a second message from the terminal, where the second message is used to request to establish a session;
  • the sending unit 1002 is further configured to send a second response message of the second message to the terminal, where the second response message includes a session management network element and a policy control network element in the first communication network. And at least one of the user plane network elements supports information of the second communication network.
  • the embodiment of the present application further provides a device for inter-system interoperation, the device includes:
  • a receiving unit configured to receive a third message sent by the access management network element in the first communications network, where the third message includes first indication information and second indication information, where the first indication information is used Instructing the terminal to support the first non-access stratum NAS of the first communications network and the second NAS of the second communications network, where the second indication information is used to indicate that the terminal supports the registration capability of the single network;
  • a selecting unit configured to select, according to the third message, a policy control network element supporting the second communication network and/or a user plane network element supporting the second communication network in the first communication network.
  • the embodiment of the present application further provides a device for inter-system interoperation, the device includes:
  • a receiving unit configured to receive an access request message sent by the terminal, where the access request message includes first indication information and second indication information, where the first indication information is used to indicate that the terminal supports the first communication a second non-access stratum NAS of the network and a second NAS of the second communications network, where the second indication information is used to indicate that the terminal supports a single network registration capability;
  • a selecting unit configured to select, according to the access request message, an access management network element that has an interface with an access management network element of the second communication network in the first communications network.
  • the UE in order to support the interoperability between the 5G system and the 4G system, the UE needs to support the 5GC NAS and the EPC NAS. If the UE supports only one type of NAS, the interoperability between the 5G system and the 4G system cannot be implemented. Therefore, the UE supports 5GC. NAS and EPC NAS are prerequisites for interoperating between 5G systems and 4G systems.
  • the UE can generally support single registration (SR) or dual registration (DR) modes.
  • SR means that the UE has only one active MM (mobility management) state (RM-5GC, EMM-EPC), which means that the UE is either in the 5GC non-access stratum (Non-Access Stratum, NAS).
  • NAS Non-Access Stratum
  • Mode either in EPC NAS mode, ie UE can only be registered in one system.
  • the so-called dual registration means that the UE can only register on the 5GC NAS, or can only register on the EPC NAS, or can be registered in the 5GC NAS mode and the EPC NAS mode at the same time, that is, the UE can be registered only in one system, or Registered in two different systems.
  • the terminal sends the network capability of the network to the network side in advance, and the network side feedbacks the interoperability support status of the network side according to the network capability of the terminal.
  • the corresponding policy can be timely implemented according to the network side interoperation support situation, that is, when the terminal determines that the network side supports the interoperation, the current first communication network can be used to obtain the subscription context information of the UE of the target second communication network, and then migrate.
  • the terminal determines that the network side does not support, it will not continue to try in the current first communication network, but directly initiate registration to the target second communication network, thereby achieving the purpose of reducing the delay and ensuring the continuity of the terminal service.
  • the embodiment of the present application further provides a computer storage medium, where the software program stores a software program, and the software program can implement any of the first aspect or the first aspect when read and executed by one or more processors.
  • the method provided by the design is not limited to:
  • the present application also provides a computer program product comprising instructions which, when executed on a computer, cause the computer to perform the different system interoperability methods described in the various aspects above or in various possible implementations.
  • FIG. 11 is a schematic structural diagram of a terminal according to an embodiment of the present disclosure, where the terminal includes: a communication interface 1101, a processor 1102, a memory 1103, and a bus system 1104;
  • the memory 1103 is configured to store a program.
  • the program can include program code, the program code including computer operating instructions.
  • the memory 1103 may be a random access memory (RAM) or a non-volatile memory (NVM), such as at least one disk storage. Only one memory is shown in the figure, of course, the memory can also be set to a plurality as needed. Memory 1103 can also be a memory in processor 1102.
  • the memory 1103 stores the following elements, executable modules or data structures, or a subset thereof, or an extended set thereof:
  • Operation instructions include various operation instructions for implementing various operations.
  • Operating system Includes a variety of system programs for implementing various basic services and handling hardware-based tasks.
  • the processor 1102 controls the operation of the terminal 1100.
  • the processor 1102 may also be referred to as a central processing unit (CPU).
  • CPU central processing unit
  • the components of the terminal are coupled together by a bus system 1104.
  • the bus system 1104 may include a power bus, a control bus, a status signal bus, and the like in addition to the data bus.
  • various buses are labeled as bus system 1104 in the figure. For ease of representation, only the schematic drawing is shown in FIG.
  • Processor 1102 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method may be completed by an integrated logic circuit of hardware in the processor 1102 or an instruction in a form of software.
  • the processor 1102 described above may be a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, or discrete hardware. Component.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • the methods, steps, and logical block diagrams disclosed in the embodiments of the present application can be implemented or executed.
  • the general purpose processor may be a microprocessor or the processor or any conventional processor or the like.
  • the steps of the method disclosed in the embodiments of the present application may be directly implemented by the hardware decoding processor, or may be performed by a combination of hardware and software modules in the decoding processor.
  • the software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like.
  • the storage medium is located in the memory 1103, and the processor 1102 reads the information in the memory 1103 and performs the above method steps in conjunction with its hardware.
  • FIG. 12 is a schematic structural diagram of an access management network element according to an embodiment of the present disclosure, where the access management network element includes: a communication interface 1201, a processor 1202, a memory 1203, and a bus system 1204;
  • the memory 1103 is configured to store a program.
  • the program can include program code, the program code including computer operating instructions.
  • the memory 1103 may be a random access memory (RAM) or a non-volatile memory (NVM), such as at least one disk storage. Only one memory is shown in the figure, of course, the memory can also be set to a plurality as needed. Memory 1103 can also be a memory in processor 1102.
  • the memory 1103 stores the following elements, executable modules or data structures, or a subset thereof, or an extended set thereof:
  • Operation instructions include various operation instructions for implementing various operations.
  • Operating system Includes a variety of system programs for implementing various basic services and handling hardware-based tasks.
  • the processor 1202 controls the operation of the access management network element 1200.
  • the processor 1202 may also be referred to as a central processing unit (CPU).
  • CPU central processing unit
  • the components of the access management network element are coupled together by a bus system 1204.
  • the bus system 1204 may include a power bus, a control bus, a status signal bus, and the like in addition to the data bus.
  • various buses are labeled as bus system 1204 in the figure. For ease of representation, only the schematic drawing is shown in FIG.
  • Processor 1202 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method may be completed by an integrated logic circuit of hardware in the processor 1202 or an instruction in a form of software.
  • the processor 1202 described above may be a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, or discrete hardware. Component.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • the methods, steps, and logical block diagrams disclosed in the embodiments of the present application can be implemented or executed.
  • the general purpose processor may be a microprocessor or the processor or any conventional processor or the like.
  • the steps of the method disclosed in the embodiments of the present application may be directly implemented by the hardware decoding processor, or may be performed by a combination of hardware and software modules in the decoding processor.
  • the software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like.
  • the storage medium is located in the memory 1203, and the processor 1202 reads the information in the memory 1203 and performs the above method steps in conjunction with its hardware.
  • FIG. 13 is a schematic structural diagram of an apparatus for inter-system interoperation according to an embodiment of the present disclosure.
  • the apparatus includes: a determining unit 1301, a sending unit 1302, and a receiving unit 1303, where:
  • a determining unit 1301, configured to determine that the terminal has been registered in the first communication network and the second communication network
  • the sending unit 1302 is configured to send, to the session management network element of the first communications network, a fourth message from the terminal, where the fourth message is used to request to establish a session, and the fourth message includes the first
  • the access management network element supports a single registration capability in the first communication network
  • the receiving unit 1303 is configured to receive, by the session management network element, a response message of the fourth message, where the response message of the fourth message includes session management context information of the terminal in the second communication network.
  • FIG. 14 is a schematic structural diagram of an apparatus for inter-system interoperation according to an embodiment of the present disclosure.
  • the apparatus includes: a determining unit 1401, a receiving unit 1402, and a sending unit 1403, where:
  • a determining unit 1401 configured to determine that the terminal has completed registration in the first communication network and the second communication network, where the session management network element supports the first communication network and the second communication network;
  • the receiving unit 1402 is configured to receive a fourth message from the first access management network element of the first communications network, where the fourth message is used to request to establish a session, and the fourth message includes the first access
  • the management network element supports the registration capability of the single network in the first communication network
  • the sending unit 1403 is configured to send, to the first access management network element, a response message of the fourth message, where the response message includes session management context information of the terminal in the second communication network.
  • the sending unit 1403 is further configured to send a fifth message to the policy control network element, where the fifth message includes the first access management network element supporting a single in the first communication network.
  • Network registration capability
  • the receiving unit 1402 is further configured to receive a response message of the fifth message from the policy control network element, where the response message of the fifth message includes a policy and a plan of the terminal in the first communication network.
  • the fee controls the PCC rules and the PCC rules of the terminal in the second communication network.
  • the apparatus further includes a generating unit 1404, configured to generate the terminal according to a PCC rule of the terminal in the first communication network and a PCC rule of the terminal in the second communication network. a first quality of service parameter of the first communication network and a second quality of service parameter of the terminal in the second communication network;
  • the sending unit 1403 is further configured to send the first quality of service parameter and the second quality of service parameter to the first access management network element.
  • the session management network element is a visited session management network element in the first communication network, and the sending unit 1403 is further configured to be a home location in the first communication network.
  • the session management network element sends a sixth message, where the sixth message includes the first access management network element supporting the registration capability of the single network in the first communication network;
  • the receiving unit 1402 is further configured to receive a response message of the sixth message from the home session management network element, where the response message of the sixth message includes the session of the terminal in the second communication network Manage context information.
  • FIG. 15 is a schematic structural diagram of an apparatus for inter-system interoperation according to an embodiment of the present disclosure.
  • the apparatus includes: a determining unit 1501, a receiving unit 1502, and a sending unit 1503, where:
  • Determining 1501 determining that the terminal has completed registration in the first communication network and the second communication network;
  • the receiving unit 1502 is configured to receive a fifth message sent by the session management network element of the first communications network, where the fifth message is used to request to send policy information, where the fifth message includes the first access
  • the management network element supports the registration capability of the single network in the first communication network
  • a sending unit 1503 configured to send, to the session management network element, a response message of the fifth message, where the response message of the fifth message includes a policy and charging control PCC rule applicable to the first communications network, and applicable a PCC rule for the second communication network.
  • FIG. 16 is a schematic structural diagram of an access management network element corresponding to the inter-system interoperation method of FIG. 6 according to an embodiment of the present disclosure, where the access management network element includes: a communication interface 1601, a processor 1602, a memory 1603, and a bus system 1604;
  • the memory 1603 is configured to store a program.
  • the program can include program code, the program code including computer operating instructions.
  • the memory 1103 may be a random access memory (RAM) or a non-volatile memory (NVM), such as at least one disk storage. Only one memory is shown in the figure, of course, the memory can also be set to a plurality as needed. Memory 1103 can also be a memory in processor 1602.
  • the memory 1603 stores the following elements, executable modules or data structures, or a subset thereof, or an extended set thereof:
  • Operation instructions include various operation instructions for implementing various operations.
  • Operating system Includes a variety of system programs for implementing various basic services and handling hardware-based tasks.
  • the processor 1602 controls the operation of the access management network element 1600.
  • the processor 1602 may also be referred to as a central processing unit (CPU).
  • CPU central processing unit
  • the various components of the terminal are coupled together by a bus system 1604.
  • the bus system 1604 may include a power bus, a control bus, a status signal bus, and the like in addition to the data bus.
  • various buses are labeled as bus system 1604 in the figure. For ease of representation, only the schematic drawing is shown in FIG.
  • the method disclosed in the foregoing embodiment of the present application may be applied to the processor 1602 or implemented by the processor 1602.
  • the processor 1602 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method may be completed by an integrated logic circuit of hardware in the processor 1602 or an instruction in a form of software.
  • the processor 1602 described above may be a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, or discrete hardware. Component.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • the methods, steps, and logical block diagrams disclosed in the embodiments of the present application can be implemented or executed.
  • the general purpose processor may be a microprocessor or the processor or any conventional processor or the like.
  • the steps of the method disclosed in the embodiments of the present application may be directly implemented by the hardware decoding processor, or may be performed by a combination of hardware and software modules in the decoding processor.
  • the software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like.
  • the storage medium is located in the memory 1603, and the processor 1602 reads the information in the memory 1603 and performs the above method steps in conjunction with its hardware.
  • FIG. 17 is a schematic structural diagram of a session management network element corresponding to the inter-system interoperation method of FIG. 6 according to an embodiment of the present disclosure, where the session management network element includes: a communication interface 1701, a processor 1702, a memory 1703, and a bus system 1704;
  • the memory 1703 is configured to store a program.
  • the program can include program code, the program code including computer operating instructions.
  • the memory 1703 may be a random access memory (RAM) or a non-volatile memory (NVM), such as at least one disk storage. Only one memory is shown in the figure, of course, the memory can also be set to a plurality as needed. Memory 1703 can also be a memory in processor 1702.
  • the memory 1703 stores the following elements, executable modules or data structures, or a subset thereof, or an extended set thereof:
  • Operation instructions include various operation instructions for implementing various operations.
  • Operating system Includes a variety of system programs for implementing various basic services and handling hardware-based tasks.
  • the processor 1602 controls the operation of the session management network element 1700.
  • the processor 1702 may also be referred to as a central processing unit (CPU).
  • CPU central processing unit
  • the various components of the terminal are coupled together by a bus system 1604.
  • the bus system 1704 may include a power bus, a control bus, a status signal bus, and the like in addition to the data bus.
  • various buses are labeled as bus system 1704 in the figure. For ease of representation, only the schematic drawing is shown in FIG.
  • the method disclosed in the foregoing embodiment of the present application may be applied to the processor 1702 or implemented by the processor 1702.
  • the processor 1702 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method may be completed by an integrated logic circuit of hardware in the processor 1702 or an instruction in a form of software.
  • the processor 1702 described above may be a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, or discrete hardware. Component.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • the methods, steps, and logical block diagrams disclosed in the embodiments of the present application can be implemented or executed.
  • the general purpose processor may be a microprocessor or the processor or any conventional processor or the like.
  • the steps of the method disclosed in the embodiments of the present application may be directly implemented by the hardware decoding processor, or may be performed by a combination of hardware and software modules in the decoding processor.
  • the software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like.
  • the storage medium is located in memory 1703, and processor 1702 reads the information in memory 1703 and performs the above method steps in conjunction with its hardware.
  • FIG. 18 is a schematic structural diagram of a policy control network element corresponding to the inter-system interoperation method of FIG. 6 according to an embodiment of the present disclosure, where the policy control network element includes: a communication interface 1801, a processor 1802, a memory 1803, and a bus system 1804;
  • the memory 1803 is configured to store a program.
  • the program can include program code, the program code including computer operating instructions.
  • the memory 1803 may be a random access memory (RAM) or a non-volatile memory (NVM), such as at least one disk storage. Only one memory is shown in the figure, of course, the memory can also be set to a plurality as needed.
  • the memory 1803 can also be a memory in the processor 1802.
  • the memory 1803 stores the following elements, executable modules or data structures, or a subset thereof, or an extended set thereof:
  • Operation instructions include various operation instructions for implementing various operations.
  • Operating system Includes a variety of system programs for implementing various basic services and handling hardware-based tasks.
  • the processor 1802 controls the operation of the policy control network element 1800.
  • the processor 1802 may also be referred to as a central processing unit (CPU).
  • CPU central processing unit
  • the components of the terminal are coupled together by a bus system 1804.
  • the bus system 1804 may include a power bus, a control bus, a status signal bus, and the like in addition to the data bus.
  • various buses are labeled as bus system 1804 in the figure. For ease of representation, only the schematic drawing is shown in FIG.
  • the method disclosed in the foregoing embodiment of the present application may be applied to the processor 1802 or implemented by the processor 1802.
  • the processor 1802 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method may be completed by an integrated logic circuit of hardware in the processor 1802 or an instruction in a form of software.
  • the processor 1802 described above may be a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, or discrete hardware. Component.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • the methods, steps, and logical block diagrams disclosed in the embodiments of the present application can be implemented or executed.
  • the general purpose processor may be a microprocessor or the processor or any conventional processor or the like.
  • the steps of the method disclosed in the embodiments of the present application may be directly implemented by the hardware decoding processor, or may be performed by a combination of hardware and software modules in the decoding processor.
  • the software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like.
  • the storage medium is located in the memory 1803, and the processor 1802 reads the information in the memory 1803 and performs the above method steps in conjunction with its hardware.
  • the terminal sends the network capability of the network to the network side in advance, and the network side feedbacks the interoperability support status of the network side according to the network capability of the terminal.
  • the corresponding policy can be timely implemented according to the network side interoperation support situation, that is, when the terminal determines that the network side supports the interoperation, the current first communication network can be used to obtain the subscription context information of the UE of the target second communication network, and then migrate.
  • the terminal determines that the network side does not support, it will not continue to try in the current first communication network, but directly initiate registration to the target second communication network, thereby achieving the purpose of reducing the delay and ensuring the continuity of the terminal service.
  • Embodiments of the present application provide a method for inter-system interoperation, including:
  • Step 191 The terminal sends a seventh message to the access management network element of the first communication network of the visited place, where the seventh message is used to establish a packet data unit session.
  • the terminal may send the seventh message to the access management network element via the access network device of the first communication network visited.
  • the access management network element of the first communication network of the visited place may be an access and mobility management network element, for example, the AMF network element in FIG.
  • the access management network element of the first communication network of the visited place may be a mobility management network element, for example, the MME network element in FIG.
  • the seventh message may be a PDU session establishment request message.
  • the terminal supports the capability of single network registration or the capability of dual network registration at the home location and the visited place.
  • the seventh message may include the capability of the terminal to support single network registration or the capability of dual network registration.
  • Step 192 The access management network element of the first communication network of the visited place determines the interoperability of the first communication network of the visited place.
  • the access management network element of the first communication network of the visited place determines the interoperability of the first communication network of the visited place.
  • the interoperability of the first communication network includes the ability of the first communication network in the visited place to support the single network registration of the terminal, or the ability of the first communication network in the visited place to support the dual network registration of the terminal.
  • the interoperability of the first communication network includes one and only one of the above two capabilities.
  • the access management network element of the first communication network of the visited place is based on the access management network element of the first communication network of the visited place and the access management network element of the second communication network of the visited place. Whether there is an interface between them determines the interoperability of the first communication network of the visited place. Specifically, when there is an interface between the access management network element of the first communication network of the visited place and the access management network element of the second communication network of the visited place, determining that the first communication network of the visited place supports the terminal The ability to register on a single network. For example, when there is an interface between the AMF network element of the visited place and the MME network element of the visited place, the capability of the AMF network element to support single network registration of the terminal is determined.
  • the access management network element of the first communication network of the visited place When there is no interface between the access management network element of the first communication network of the visited place and the access management network element of the second communication network of the visited place, it is determined that the first communication network of the visited place supports the dual network of the terminal The ability to register. For example, when there is no interface between the AMF network element of the visited place and the MME network element of the visited place, the capability of the AMF network element to support the dual network registration of the terminal is determined.
  • the corresponding access management network element of the first communication network of the visited place is an AMF network element
  • the second communication network of the visited place is a 4G network.
  • the access management network element of the second communication network of the visited place is the MME network element; when the first communication network of the visited place is the 4G network, the corresponding access management network element of the first communication network of the visited place is the MME.
  • the network element, the second communication network of the visited place is a 5G network, and the access management network element of the second communication network of the visited place is an AMF network element.
  • Step 193 The access management network element of the first communication network of the visited place sends an eighth message to the first communication network of the home location of the terminal, where the eighth message is used to establish the packet data unit session, and the eighth The message includes the interoperability.
  • the access management network element of the first communication network of the visited place sends an eighth message to the session management network element of the first communication network of the home location of the terminal.
  • the access management network element of the first communication network of the visited place may send an eighth message to the session management network element of the first communication network of the home of the terminal via the session management network element of the visited first communication network.
  • the session management network element of the first communication network of the visited place may be a V-SMF network element.
  • the session management network element of the first communication network of the home location may be an H-SMF network element.
  • the session management network element of the first communication network of the visited place may be a V-PGW network element or a V-PGW-C network element.
  • the session management network element of the first communication network of the home location may be an H-PGW network element or an H-PGW-C network element.
  • the SMF network element and the PGW network element (or the PGW-C network element) may be physically configured in a unified manner, or may be separately set. This application is not limited.
  • Step 194 The first communication network of the home location sends a response message of the eighth message to the access management network element of the first communication network of the visited place.
  • the session management network element of the first communication network of the home location sends a response message of the eighth message to the access management network element of the first communication network of the visited place.
  • the session management network element of the first communication network of the home location may send a response message of the eighth message to the access management network element of the first communication network of the visited place via the session management network element of the visited first communication network.
  • the response message of the eighth message includes the first communication of the terminal addressed to the terminal at the visited place.
  • the first session management context information in the second communication network of the network and the visited place, and/or the first communication network and the visit of the terminal of the access network device of the first communication network addressed to the visited place at the visited place The second session management context information in the second communication network of the ground; when the interoperation capability includes the capability of the first communication network of the visited place to support the dual network registration of the terminal, the response message of the eighth message includes the terminal only visiting Session management context information in the first communication network of the ground.
  • the response message of the eighth message includes indication information.
  • the indication information is used to indicate that the first communication network of the visited place sends the interoperability to the access network device of the visited place.
  • Step 195 The access management network element of the first communication network of the visited place sends the indication information to the access network device of the first communication network of the visited place.
  • the indication information is used to indicate the ability of the first communication network of the visited place to support the dual network registration of the terminal.
  • the access network device of the first communication network of the visited place After receiving the indication information, the access network device of the first communication network of the visited place does not send a handover request message to the access management network element of the visited place in the connection situation, because the access of the visited place is The management NE does not support the switching of the N26.
  • the access network device of the first communication network of the visited place may instruct the terminal to perform TAU or handover, or the access network device of the first communication network of the visited place sends the capability of the first communication network to support dual network registration to terminal.
  • Embodiments of the present application provide a device for inter-system interoperability, see FIG.
  • the apparatus includes a transceiver unit 2001, a processing unit 2002, and a storage unit 2003.
  • the transceiver unit 2001, the processing unit 2002, and the storage unit 2003 may be physically separated from each other, or may be integrated into one or more physical units, which is not limited herein.
  • the transceiver unit 2001 is configured to implement content interaction between the processing unit 2002 and other units or network elements.
  • the transceiver unit 2001 may be a communication interface of the inter-system interoperable device, a transceiver circuit or a transceiver, or a transceiver.
  • the transceiver unit 2001 can also be an antenna device and a circuit that matches the antenna device.
  • the transceiver unit 2001 can also be a communication interface or a transceiver circuit of the processing unit 2002.
  • the inter-system interoperable device may also include a plurality of transceiver units 2001 or the transceiver unit 2001 includes a plurality of sub-transceiver units.
  • the transceiver unit 2001 may further include a transmitting unit and a receiving unit.
  • the processing unit 2002 is configured to implement processing of data by means of inter-system interoperation.
  • Processing unit 2002 can be a processing circuit or a processor.
  • the processor may be a central processing unit (CPU), a network processor (NP) or a combination of a CPU and an NP.
  • the processor may further include a hardware chip.
  • the hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a combination thereof.
  • the PLD may be a complex programmable logic device (CPLD), a field-programmable gate array (FPGA), a Generic Array Logic (GAL), or any combination thereof.
  • CPLD complex programmable logic device
  • FPGA field-programmable gate array
  • GAL Generic Array Logic
  • the inter-system interoperable device may also include a plurality of processing units or the processing unit 2002 includes a plurality of sub-data processing units.
  • the processor may be a single-CPU processor or a multi-core processor.
  • the storage unit 2003 is for storing computer instructions executed by the processing unit 2002.
  • the storage unit 2003 may be a storage circuit or a memory.
  • the memory can be either volatile memory or non-volatile memory, or can include both volatile and nonvolatile memory.
  • the non-volatile memory may be a read-only memory (ROM), a programmable read only memory (ROMM), an erasable programmable read only memory (erasable PROM, EPROM), or an electrical Erase programmable EPROM (EEPROM) or flash memory.
  • the volatile memory can be a random access memory (RAM) that acts as an external cache.
  • the storage unit 2003 may be a unit independent of the processing unit 2002, or may be a storage unit in the processing unit 2002, which is not limited herein. Although only one memory unit 2003 is shown in FIG. 20, the inter-system interoperable device may also include a plurality of memory cells 2003 or the memory cells 2003 may include a plurality of sub-memory cells.
  • the processing unit 2002 may perform content interaction with other network elements through the transceiver unit 2001. For example, the processing unit 2002 acquires or receives content from other network elements. If the processing unit 2002 and the transceiver unit 2001 are physically separate components, the processing unit 2002 may perform content interaction without the transceiver unit 2001 interacting with other units within the device interoperating with the different systems.
  • the transceiver unit 2001, the processing unit 2002, and the storage unit 2003 may be connected to each other through a bus.
  • the bus can be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus.
  • PCI peripheral component interconnect
  • EISA extended industry standard architecture
  • the bus can be divided into an address bus, a data bus, a control bus, and the like.
  • the processing unit 2002 causes the inter-system interoperable devices to implement the methods of the respective implementations corresponding to FIGS. 2-8 and 19 of the present application based on the computer instructions stored in the storage unit 2003.
  • the device that interoperates with the different system may be an access management network element of the first communication network of the visited place of the terminal, such as an AMF network element or an MME network element.
  • the transceiver unit 2001 is configured to receive a seventh message from the terminal, where the seventh message is used to establish a packet data unit session, and the processing unit 2002 is configured to determine an interoperability of the first communication network of the visited place of the terminal; The transceiver unit 2001 is further configured to send an eighth message to the first communication network of the home location of the terminal, where the eighth message is used to establish the packet data unit session, and the eighth message includes the interoperation ability.
  • the processing unit 2002 determines, according to an interface between the device that interoperates with the different system and the access management network element of the second communication network of the visited location, the location of the visited place. The ability of a communication network to support a single network registration for the terminal.
  • the transceiver unit 2001 is further configured to receive, by the first communication network of the home location, a first communication network and a location of the terminal that is sent to the terminal at the visited place.
  • the transceiver unit 2001 is further configured to receive, by the first communication network that is sent by the home network, the terminal of the access network device that is sent to the first communication network of the visited place.
  • the processing unit 2002 determines, according to the interface between the inter-system interoperable device and the access management network element of the second communication network of the visited place, that the visited place is determined. The ability of the first communication network to support dual network registration for the terminal.
  • the transceiver unit 2001 is further configured to receive only the session management context information of the terminal that is sent by the first communication network of the home location in the first communication network of the visited place.
  • the transceiver unit 2001 is further configured to send indication information to an access network device of the first communication network of the visited location, where the indication information is used to indicate the first location of the visited place The ability of the communication network to support dual network registration for the terminal.
  • the processing unit 2002 enables the inter-system interoperable device to implement the operation of the access management network element in the visited place in the embodiment of FIG. 19 according to the computer instruction stored in the storage unit 2003.
  • the processing unit 2002 receives, by using the transceiver unit 2001, a seventh message from the terminal, where the seventh message is used to establish a packet data unit session; and the processing unit 2002 uses the transceiver unit 2001 to The first communication network of the home of the terminal transmits an eighth message, the eighth message is used to establish the packet data unit session, and the eighth message includes the interoperability.
  • the processing unit 2002 receives, by using the transceiver unit 2001, the session management context of the terminal sent by the first communication network of the home location in the first communication network of the visited place and the second communication network of the visited place. information.
  • the processing unit 2002 uses the transceiver unit 2001 to receive only the session management context information of the terminal sent by the first communication network of the home location in the first communication network of the visited place.
  • the processing unit 2002 sends, by using the transceiver unit 2001, the indication information to the access network device of the first communication network of the visited place, where the indication information is used to indicate that the first communication network of the visited place supports dual network registration for the terminal.
  • the indication information is used to indicate that the first communication network of the visited place supports dual network registration for the terminal.
  • the inter-system interoperable device may be a session management network element of the first communication network at the home of the terminal, such as an SMF network element or a PGW-C network element.
  • the processing unit 2002 is configured to receive, by using the transceiver unit 2001, an eighth message sent by an access management network element of the first communication network of the visited location of the terminal, where the eighth message is used to establish a packet data unit session, where the The eight messages include the interoperability of the first communication network of the visited place; the processing unit 2002 is configured to send, by the transceiver unit 2001, the eighth message to the access management network element of the first communication network of the visited place Response message.
  • the processing unit 2002 enables the inter-system interoperable device to implement the operation of the session management network element at the home in the embodiment of FIG. 19 according to the computer instructions stored in the storage unit 2003.
  • the names of request messages, response messages, and other various messages are employed for convenience of description. However, these messages are merely illustrative of the content to be carried or the functions to be carried.
  • the specific name of the message is not limited to the present application, for example, it may be a first message, a second message or a third message. These messages can be specific messages and can be some of the fields in the message. These messages can also represent various service operations.
  • the network side network element may be a network element on an entity, or may be a virtual network element, which is not limited in this application.
  • embodiments of the invention may be provided as a method, system, or computer program product.
  • embodiments of the invention may be in the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware.
  • embodiments of the invention may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) including computer usable program code.
  • Embodiments of the invention are described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG.
  • These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

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  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé et un dispositif pour des opérations interactives entre différents systèmes. Le procédé comprend les étapes suivantes : un terminal envoie un premier message à un premier élément de réseau de gestion d'accès d'un premier réseau de communication, le premier message comprenant des premières informations d'indication et des secondes informations d'indication, les premières informations d'indication indiquant que le terminal prend en charge une première strate de non-accès (NAS) du premier réseau de communication et une seconde NAS d'un second réseau de communication, et les secondes informations d'indication indiquent que le terminal prend en charge un enregistrement de réseau unique ; et le terminal reçoit un premier message de réponse au premier message provenant du premier élément de réseau de gestion d'accès, le premier message de réponse comprenant des informations indiquant si une interface existe entre le premier élément de réseau de gestion d'accès et un second élément de réseau de gestion d'accès du second réseau de communication. Ainsi, l'invention résout des problèmes d'opérations interactives existantes entre différents systèmes dans lesquels il existe une importante quantité de signalisation et le fonctionnement est complexe.
PCT/CN2018/100292 2017-08-14 2018-08-13 Procédé et dispositif pour des opérations interactives entre différents systèmes Ceased WO2019034021A1 (fr)

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CN201710977703.3A CN109391932A (zh) 2017-08-14 2017-10-17 一种异系统互操作的方法及装置

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