WO2023087328A1 - Procédé et appareil de transfert, dispositif, et support d'enregistrement - Google Patents

Procédé et appareil de transfert, dispositif, et support d'enregistrement Download PDF

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Publication number
WO2023087328A1
WO2023087328A1 PCT/CN2021/132187 CN2021132187W WO2023087328A1 WO 2023087328 A1 WO2023087328 A1 WO 2023087328A1 CN 2021132187 W CN2021132187 W CN 2021132187W WO 2023087328 A1 WO2023087328 A1 WO 2023087328A1
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Prior art keywords
signaling
amf
fusion
converged
network
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PCT/CN2021/132187
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English (en)
Chinese (zh)
Inventor
崔欢喜
李海涛
陈景然
肖振宇
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Oppo广东移动通信有限公司
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Application filed by Oppo广东移动通信有限公司 filed Critical Oppo广东移动通信有限公司
Priority to PCT/CN2021/132187 priority Critical patent/WO2023087328A1/fr
Priority to CN202180101551.5A priority patent/CN117981390A/zh
Publication of WO2023087328A1 publication Critical patent/WO2023087328A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/20—Services signaling; Auxiliary data signalling, i.e. transmitting data via a non-traffic channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation

Definitions

  • the embodiments of the present application relate to the field of communication technologies, and in particular to a handover method, device, device, and storage medium.
  • New Radio New Radio
  • NTN non-Terrestrial Network
  • NTN technology generally uses satellite communication to provide communication services to terminal equipment on the ground. If a mobile device using the NTN technology needs to perform cell handover, it is generally implemented through a handover process.
  • Embodiments of the present application provide a handover method, device, equipment, and storage medium. Described technical scheme is as follows:
  • a handover method is provided, the method is applied to a terminal device in a converged network, and the converged network includes network elements with converged access network functions and core network functions, the method include:
  • the fusion signaling is transmitted with the network element device, and the fusion signaling carries at least two pieces of signaling related to the handover process.
  • a handover method is provided, and the method is applied to a target-side distribution unit (Distribute Unit, DU) in a converged network, which includes a converged access network function and a core A network element of a network function, the method comprising:
  • the fusion signaling is transmitted with the terminal device, and the fusion signaling carries at least two pieces of signaling related to the handover process.
  • a handover method is provided, and the method is applied to a source-side DU in a converged network, where the converged network includes network elements with converged access network functions and core network functions, so
  • the methods described include:
  • the fusion signaling is transmitted with the terminal device, and the fusion signaling carries at least two pieces of signaling related to the handover process.
  • a handover method is provided, and the method is applied to the target side centralized unit-control plane-access and mobility management (Center Unit Control Plane Access and Mobility Management Function, CU) of the converged network -CP-AMF), the CU-CP-AMF is a network element that integrates access network functions and core network functions and is used for access and mobility management, and the method includes:
  • the fusion signaling is transmitted with the terminal device, and the fusion signaling carries at least two pieces of signaling related to the handover process.
  • a handover method is provided, the method is applied to the source side CU-CP-AMF of the converged network, and the CU-CP-AMF is a converged access network function and a core network function .
  • a network element for access and mobility management comprising:
  • the fusion signaling is transmitted with the terminal device, and the fusion signaling carries at least two pieces of signaling related to the handover process.
  • a switching device is provided, the device is located in a converged network, and the converged network includes network elements that converge functions of an access network and a core network, and the device includes: command transmission module;
  • the integrated signaling transmission module is configured to transmit integrated signaling with network element equipment during the handover process, and the integrated signaling carries at least two signalings related to the handover process.
  • a switching device is provided, the device is located in a converged network, and the converged network includes network elements that converge functions of an access network and a core network, and the device includes: command transmission module;
  • the integrated signaling transmission module is configured to transmit integrated signaling with the terminal device during the handover process, and the integrated signaling carries at least two pieces of signaling related to the handover process.
  • a switching device is provided, the device is located in a converged network, and the converged network includes network elements that converge functions of an access network and a core network, and the device includes: command transmission module;
  • the fusion signaling transmission module is configured to transmit fusion signaling with the terminal device during the handover process, and the fusion signaling carries at least two signalings related to the handover process.
  • a switching device is provided, the device is located in a converged network, and the converged network includes network elements that converge functions of an access network and a core network, and the device includes: command transmission module;
  • the integrated signaling transmission module is used to transmit integrated signaling with the source side CU-CP-AMF during the handover process
  • the integrated signaling transmission module is configured to transmit the integrated signaling with the terminal device during the handover process, where the integrated signaling carries at least two pieces of signaling related to the handover process.
  • a switching device is provided, the device is located in a converged network, and the converged network includes network elements that converge functions of an access network and a core network, and the device includes: command transmission module;
  • the fusion signaling transmission module is used to transmit fusion signaling with the target side CU-CP-AMF during the handover process;
  • the integrated signaling transmission module is configured to transmit the integrated signaling with the terminal device during the handover process, where the integrated signaling carries at least two pieces of signaling related to the handover process.
  • a terminal device is provided, the terminal device is in a converged network, the converged network includes network elements with converged access network functions and core network functions, and the terminal device includes a transceiver device;
  • the transceiver is configured to transmit fusion signaling with the network element device during the handover process, where the fusion signaling carries at least two pieces of signaling related to the handover process.
  • a target side DU is provided, the target side DU is in a converged network, and the converged network includes network elements that integrate access network functions and core network functions, and the target side DU DU includes a transceiver;
  • the transceiver is configured to transmit fusion signaling with the terminal device during the handover process, where the fusion signaling carries at least two pieces of signaling related to the handover process.
  • a source-side DU is provided.
  • the source-side DU is located in a converged network, and the converged network includes network elements that integrate access network functions and core network functions.
  • the source-side DU DU includes a transceiver;
  • the transceiver is configured to transmit fusion signaling with the terminal device during the handover process, where the fusion signaling carries at least two pieces of signaling related to the handover process.
  • a target side CU-CP-AMF is provided, the CU-CP-AMF is a network element that integrates access network functions and core network functions and is used for access and mobility management , the target side CU-CP-AMF includes a transceiver;
  • the transceiver is used to transmit fusion signaling with the source side CU-CP-AMF during the handover process;
  • the transceiver is configured to transmit the fusion signaling with the terminal device during the handover process, where the fusion signaling carries at least two pieces of signaling related to the handover process.
  • a source-side CU-CP-AMF is provided, the CU-CP-AMF is a network element that integrates access network functions and core network functions and is used for access and mobility management
  • the source side CU-CP-AMF includes a transceiver;
  • the transceiver is used to transmit fusion signaling with the CU-CP-AMF on the target side during the handover process;
  • the transceiver is configured to transmit the fusion signaling with the terminal device during the handover process, where the fusion signaling carries at least two pieces of signaling related to the handover process.
  • a computer-readable storage medium where a computer program is stored in the storage medium, and the computer program is used for execution by a processor, so as to implement the foregoing switching method.
  • a chip is provided, and the chip includes a programmable logic circuit and/or program instructions, which are used to implement the above switching method when the chip is running.
  • a computer program product or computer program includes computer instructions, the computer instructions are stored in a computer-readable storage medium, and a processor reads from the The computer-readable storage medium reads and executes the computer instructions, so as to realize the above switching method.
  • a converged network includes network elements with converged access network functions and core network functions, and integrates the access network and the core network, so that during the handover process, the terminal equipment and the network elements in the converged network
  • the meta-device can transmit a kind of converged signaling, which carries at least two signalings related to the handover process, such as: the converged signaling carries AS signaling and NAS signaling, avoiding the need for access and mobility management signaling
  • the overhead of handover signaling transmission is reduced, the risk of signaling storms during the handover process is reduced, and the handover delay is reduced.
  • Fig. 1 is a schematic diagram of a communication system provided by an exemplary embodiment of the present application
  • FIG. 2 is a schematic diagram of a fusion network provided by an exemplary embodiment of the present application.
  • FIG. 3 is a schematic diagram of an access stratum (Access Stratum, AS) and a non-access stratum (Non-Access Stratum, NAS) provided by an exemplary embodiment of the present application;
  • Access Stratum AS
  • Non-Access Stratum NAS
  • FIG. 4 is a flowchart of a handover method provided by an exemplary embodiment of the present application.
  • FIG. 5 is a flowchart of a registration process provided by an exemplary embodiment of the present application.
  • Fig. 6 is a flowchart of the service request process provided by an exemplary embodiment of the present application.
  • FIG. 7 is a flowchart of a service request process provided by an exemplary embodiment of the present application.
  • FIG. 8 is a flowchart of a handover method provided by an exemplary embodiment of the present application.
  • FIG. 9 is a flowchart of a handover method provided by an exemplary embodiment of the present application.
  • FIG. 10 is a flowchart of a handover method provided by an exemplary embodiment of the present application.
  • FIG. 11 is a flowchart of a handover method provided by an exemplary embodiment of the present application.
  • FIG. 12 is a flowchart of a handover method provided by an exemplary embodiment of the present application.
  • FIG. 13 is a flowchart of a handover method provided by an exemplary embodiment of the present application.
  • FIG. 14 is a flowchart of a handover method provided by an exemplary embodiment of the present application.
  • Fig. 15 is a block diagram of a switching device provided by an exemplary embodiment of the present application.
  • Fig. 16 is a block diagram of a switching device provided by an exemplary embodiment of the present application.
  • Fig. 17 is a block diagram of a switching device provided by an exemplary embodiment of the present application.
  • Fig. 18 is a block diagram of a switching device provided by an exemplary embodiment of the present application.
  • Fig. 19 is a block diagram of a switching device provided by an exemplary embodiment of the present application.
  • Fig. 20 is a schematic structural diagram of a communication device provided by an exemplary embodiment of the present application.
  • the network architecture and business scenarios described in the embodiments of the present application are for more clearly illustrating the technical solutions of the embodiments of the present application, and do not constitute limitations on the technical solutions provided by the embodiments of the present application.
  • the evolution of the technology and the emergence of new business scenarios, the technical solutions provided in the embodiments of this application are also applicable to similar technical problems.
  • Satellite communication is not restricted by the user's region. For example, general land communication cannot cover areas such as oceans, mountains, deserts, etc. that cannot be equipped with communication equipment or are not covered by communication due to sparse population. For satellite communication, due to a Satellites can cover a large area of the ground, and satellites can orbit the earth, so theoretically every corner of the earth can be covered by satellite communications. Secondly, satellite communication has great social value.
  • Satellite communication can be covered at a lower cost in remote mountainous areas, poor and backward countries or regions, so that people in these regions can enjoy advanced voice communication and mobile Internet technology, which is conducive to narrowing the digital gap with developed regions and promoting development of these areas.
  • the distance of satellite communication is long, and the cost of communication does not increase significantly with the increase of communication distance; finally, the stability of satellite communication is high, and it is not limited by natural disasters.
  • LEO Low-Earth Orbit
  • MEO Medium-Earth Orbit
  • GEO Geostationary Earth Orbit
  • HEO High Elliptical Orbit
  • the altitude range of low-orbit satellites is 500km to 1500km, and the corresponding orbital period is about 1.5 hours to 2 hours.
  • the signal propagation delay of single-hop communication between users is generally less than 20ms.
  • the maximum satellite visible time is 20 minutes.
  • the signal propagation distance is short, the link loss is small, and the requirements for the transmission power of the user terminal equipment are not high.
  • Satellites in geosynchronous orbit have an orbital altitude of 35786km and a period of 24 hours around the earth.
  • the signal propagation delay of single-hop communication between users is generally 250ms.
  • satellites use multiple beams to cover the ground.
  • a satellite can form dozens or even hundreds of beams to cover the ground; a satellite beam can cover tens to hundreds of kilometers in diameter. ground area.
  • the core network is separated from the access network, and the signaling processes of the AS and NAS involved in the handover are relatively independent, and the transmission of the NAS signaling depends on the establishment of the AS layer.
  • a converged network in view of the above problems, includes network elements with converged access network functions and core network functions, and integrates the access network and the core network to perform handover During the process, the terminal device and the network element equipment in the converged network can transmit a kind of converged signaling, which carries at least two signalings related to the handover process, such as: the converged signaling carries AS signaling and NAS signaling , which avoids the need for a separate NAS signaling process for access and mobility management signaling and session management signaling, reduces the overhead of handover signaling transmission, reduces the risk of signaling storms during the handover process, and reduces switching delay.
  • the converged signaling carries AS signaling and NAS signaling , which avoids the need for a separate NAS signaling process for access and mobility management signaling and session management signaling, reduces the overhead of handover signaling transmission, reduces the risk of signaling storms during the handover process, and reduces switching delay.
  • FIG. 1 shows a schematic diagram of a communication system 100 provided by an embodiment of the present application.
  • the communication system 100 may include: a user equipment (User Equipment, UE), a converged network, and a data network (Data Network, DN).
  • UE User Equipment
  • DN Data Network
  • the UE and the converged network are the main components of the architecture. Logically, they can be divided into two parts: the user plane and the control plane.
  • the control plane is responsible for the management of the mobile network
  • the user plane is responsible for the transmission of service data.
  • the UE It is the entrance for mobile users to interact with the network. It can provide basic computing capabilities and storage capabilities, display service windows to users, and accept user operation inputs. The UE will adopt the next-generation air interface technology to establish a signal connection and a data connection with the RAN, thereby transmitting control signals and service data to the mobile network.
  • Converged network It is a network including traditional access network functions and core network functions. In the converged network, it may include traditional access network elements, traditional core network elements, and network elements that integrate access network functions and core network functions.
  • the function of the access network includes: providing an access service for the UE.
  • core network functions include: session management, mobility management, policy management, security authentication and so on.
  • the DN It is a data network that provides business services for users.
  • the client is located in the UE, and the server is located in the data network.
  • the data network can be a private network, such as a local area network, or an external network that is not controlled by the operator, such as the Internet, or a proprietary network jointly deployed by the operator, such as for the configuration of the IP Multimedia Core Network Subsystem (IP Multimedia Core Network Subsystem, IMS) service.
  • IP Multimedia Core Network Subsystem IP Multimedia Core Network Subsystem
  • Figure 2 is the detailed architecture determined on the basis of Figure 1, where the fusion network includes:
  • DU A distributed unit close to the Radio Unit (RU), which is mainly responsible for user signal processing.
  • RU Radio Unit
  • Authentication Server Function Perform security authentication of UE.
  • Session Management Function (SMF): UE session management.
  • Network Exposure Function Open network functions to third parties in the form of interfaces.
  • NF Repository Function Provide storage and selection functions for network function entity information for other network elements.
  • Unified Data Management User subscription context management.
  • Policy Control Function Policy Control Function
  • PCF Policy Control Function
  • Application Function Application Function, AF: user application management.
  • Radio Intelligent Controller Provide near real-time intelligent control for the access network.
  • CU-CP-AMF used for access and mobility management.
  • the CU-CP-AMF can be regarded as the integration of the CU-CP in the traditional access network and the AMF in the core network.
  • Centralized unit-user plane-user plane function Center Unit User Plane User Plane Function, CU-UP-UPF: used for data processing and forwarding.
  • CU-UP-UPF Centralized unit-user plane-user plane function
  • the CU-UP-UPF can be regarded as the integration of the CU-UP in the traditional access network and the UPF in the core network.
  • DU and CU-UP-UPF constitute a Service Based User Plane (Service Based User Plane, SBUP), and NEF, NRF, PCF, UDM, AF, AUSF, CU-CP-AMF, RIC and SMF constitute Service Based Control Plane (SBCP).
  • SBUP Service Based User Plane
  • NRF, PCF, UDM, AF, AUSF, CU-CP-AMF, RIC and SMF constitute Service Based Control Plane (SBCP).
  • SBCP Service Based Control Plane
  • the NAS and AS models of the fusion network are shown in Figure 3.
  • the AS of the converged network includes: DU, CU-UP-UPF and part of CU-CP-AMF;
  • the NAS of the converged network includes: part of CU-CP-AMF and other network elements.
  • the AS is mainly responsible for wireless channel processing, wireless bearer management, and encryption operations.
  • NAS is mainly responsible for functions and processes that have nothing to do with access and are independent of wireless access, mainly including session management of session establishment, modification, release, and quality of service (Quality of Service, QoS) negotiation; including user data management, registration, De-registered user management; including authentication between users and the network and security management of encryption initialization; billing, etc.
  • QoS Quality of Service
  • the transmission of NAS signaling is no longer transparently transmitted on the N2 and NR interfaces through the dedicated N1 interface, but can be directly integrated with the AS signaling to complete the transmission.
  • the names of network elements (such as CU-CP-AMF, CU-UP-UPF, etc.) included in FIG. 2 and FIG. 3 are only examples, and do not limit the functions of the network elements themselves.
  • the above-mentioned network elements may also have other names, which are not specifically limited in this embodiment of the present application.
  • some or all of the above-mentioned network elements may use the terms in 5G, or may use other names, etc., which will be described in a unified manner here, and will not be described in detail below.
  • the name of the message (or signaling) transmitted between the above network elements is only an example, and does not constitute any limitation on the function of the message itself.
  • FIG. 4 shows a flowchart of a handover method provided by an embodiment of the present application, and the method is executed by a terminal device.
  • the method may include the steps of:
  • Step 402 During the handover process, the terminal device and the network element device transmit a fusion signaling, and the fusion signaling carries at least two signalings related to the handover process.
  • the terminal device is connected to the converged network, and the converged network includes network elements with converged access network functions and core network functions.
  • the network elements that integrate access network functions and core network functions include: CU-UP-UPF and CU-CP-AMF.
  • CU-CP-AMF is used for access and mobility management
  • CU-UP-UP is used for data processing and forwarding.
  • the terminal device and the network element device when the terminal device and the network element device perform the handover process, generally only one signaling related to the handover process is carried in the signaling transmitted, for example: the terminal device and the network element device on the access network side transmit an AS signal command; the terminal device and the network element device on the core network side transmit a NAS signaling.
  • the AS and NAS are originally merged together, and the signaling processes of AS and NAS no longer need to be relatively independent, and a converged network can be transmitted between the terminal device and the network element device.
  • the merged signaling carries at least two pieces of signaling related to the handover process, for example: the merged signaling carries AS signaling and NAS signaling related to the handover process.
  • the converged signaling directly carries the original NAS signaling to the DU, and then the DU relays the signaling of the user plane and the signaling of the control plane to the user plane and control plane of the converged network. noodle.
  • the converged signaling includes uplink converged signaling.
  • the terminal device sends the uplink fusion signaling to the network element device, and the network element device receives the uplink fusion signaling accordingly.
  • the uplink fusion signaling includes at least one of the following:
  • the first uplink converged signaling carries the switching confirmation and notification signaling whose destination is the CU-CP-AMF on the target side, and the message A (MSGA) whose destination is the random access procedure of the DU on the target side.
  • the terminal device sends the first uplink fusion signaling that combines the handover confirmation and notification signaling with the message A of the random access process, and after receiving the first uplink fusion signaling, the DU on the target side receives the random access message A of the entry procedure, and relay the handover confirmation and notification signaling to the target side CU-CP-AMF.
  • the second uplink converged signaling carries handover confirmation and notification signaling whose destination is the CU-CP-AMF on the target side, and message 3 (MSG3) whose destination is the random access procedure of the DU on the target side.
  • the terminal device sends the second uplink fusion signaling that combines the handover confirmation and notification signaling with the message 3 of the random access process, and after receiving the second uplink fusion signaling, the DU on the target side receives the random access message 3 of the entry procedure, and relay the handover confirmation and notification signaling to the target side CU-CP-AMF.
  • the third uplink fusion signaling carries handover confirmation and notification signaling whose destination is the target CU-CP-AMF, and a radio resource control reconfiguration complete (RRCReconfigurationComplete) message whose destination is the target CU-CP-AMF.
  • RRCReconfigurationComplete radio resource control reconfiguration complete
  • the terminal device sends the third uplink fusion signaling that combines the handover confirmation and notification signaling and RRCReconfiguraionComplete, and after receiving the third uplink fusion signaling, the target side DU relays it to the target side CU-CP-AMF .
  • the handover confirmation and notification signaling can be recorded as Handover Confirm and Notify signaling, and the handover confirmation and notification signaling is used to inform Signaling that the terminal device has synchronized to the target cell.
  • the terminal device sends a handover confirmation (Handover Confirm) signaling to the target RAN, and the handover confirmation signaling is used to inform the target RAN that the terminal device has synchronized to the target cell, and then the target RAN sends it to the target AMF Handover Notify (Handover Notify) signaling, the Handover Notify signaling is used to inform the target side that the AMF terminal equipment has been synchronized to the target cell.
  • the message that the terminal device notifies the target network element device does not need to be forwarded by RAN->AMF, which saves related procedures, and only needs to be sent by the terminal device to the CU-CP-AMF for handover confirmation and notification signaling.
  • the handover acknowledgment and notification signaling can be regarded as one signaling fused with the mobility management signaling of the access network and the core network, and the handover acknowledgment and notification signaling itself is the integrated signaling of the NAS and the AS.
  • handover confirmation and notification signaling can be integrated with AS type message A, message 3 or RRCReconfiguraaionComplete message. It can be understood that, besides messages in the random access process, message A and message 3 may also be the first message and the third message in other processes, and the first message and the third message are terminal.
  • message sent by the device to the network side is not limited in this application.
  • the fourth uplink fusion signaling carries a registration request (Registration Request) whose destination is the target CU-CP-AMF, and a radio resource control setup request (RRCSetupRequest) whose destination is the target CU-CP-AMF.
  • Registration Request a registration request
  • RRCSetupRequest a radio resource control setup request
  • the terminal device sends the fourth uplink fusion signaling which combines the registration request and the RRCSetupRequest, and after receiving the fourth uplink fusion signaling, the target side DU relays it to the target side CU-CP-AMF.
  • the fifth uplink fusion signaling carries the registration response (Registration Response) whose destination is the target CU-CP-AMF, and the radio resource control establishment completion (RRCSetupComplete) message whose destination is the target CU-CP-AMF.
  • Registration Response Registration Response
  • RRCSetupComplete radio resource control establishment completion
  • the terminal device sends the fifth uplink fusion signaling that combines the registration response and RRCSetupComplete, and the target side DU relays the fifth uplink fusion signaling to the target side CU-CP-AMF after receiving the fifth uplink fusion signaling.
  • the registration process of the terminal device in the handover process is combined with the RRC configuration process, so that the NAS signaling of the registration process is merged with the AS signaling of the RRC configuration process .
  • the radio resource control setup request (RRCSetupRequest) message and registration request of the terminal device are carried by the first message and directly reported to the converged network to start the registration of the terminal device, registration acceptance (Registration Accept) and wireless
  • the resource control establishment (RRCSetup) message is sent to the terminal device by the second message, and the registration response and the radio resource control establishment completion (RRCSetupComplete) message are reported to the converged network by the third message.
  • This process is the following CU-CP-AMF
  • the execution phase of the handover provides the registration process. Compared with the process before integration, the registration and RRC configuration no longer need to be performed step by step, and the registration process is completed together with the RRC configuration process. Therefore, the delay when the terminal device accesses the network and completes the registration is shorter, and the operation process is simpler .
  • the service request process can also be combined with the RRC configuration process.
  • FIG. 6 it shows the service request NAS process initiated by the terminal device.
  • the NAS signaling is no longer established through the uplink and downlink transparent transmission channels, but is transmitted through a new interface.
  • the radio resource control setup request (RRCSetupRequest) message and UE service setup (UEServiceSetup) of the terminal device are carried by the first message and directly reported to the converged network, and the service acceptance (ServiceAccept) and radio resource control setup (RRCSetup) messages are carried by the second message Issued to the terminal device, UE Initial Context Setup Response (UEInitialContextSetupResponse) and Radio Resource Control Setup Complete (RRCSetupComplete) messages are reported to the converged network by the third message.
  • RRCSetupRequest radio resource control setup request
  • UEServiceSetup UE service setup
  • RRCSetupComplete Radio Resource Control Setup Complete
  • FIG. 7 it shows a service request NAS process initiated by the network.
  • NAS signaling is no longer established through an uplink and downlink transparent transmission channel, but is transmitted through a new interface.
  • the network sends directly to the user through the second message carrying the paging (Paging) message directly to the terminal device, and the terminal device sends the radio resource control establishment request (RRCSetupRequest) message and UE service setup (UEServiceSetup) message to the converged network through the third message , the converged network responds to the above request through the fourth message, the fourth message carries the service acceptance (ServiceAccept) and radio resource control establishment (RRCSetup) messages, and then the terminal device reports the configuration completion response to the network device: UE initial context establishment response (UEInitial ContextSetupResponse) and Radio Resource Control Setup Complete (RRCSetupComplete) messages.
  • RRCSetupRequest radio resource control establishment request
  • UEServiceSetup Radio Resource Control Establish
  • the sixth uplink converged signaling carries the registration request whose destination is the CU-CP-AMF on the target side, and the message 3 of the random access procedure whose destination is the DU on the target side.
  • the terminal device sends the sixth uplink fusion signaling that combines the registration request and the message 3 of the random access process, and the DU on the target side receives the message of the random access process after receiving the sixth uplink fusion signaling 3, and relay the registration request to the target side CU-CP-AMF.
  • the message 3 may also be the third message in other processes, and the third message is a message sent by the terminal device to the network side, which is not discussed in this application. Be limited.
  • the seventh uplink converged signaling carries a registration response whose destination is the target CU-CP-AMF, a radio resource control reconfiguration complete (RRCReconfigurationComplete) message whose destination is the target CU-CP-AMF, and a DU message whose destination is the target DU. Message 5 of the random access procedure.
  • the terminal device sends the seventh uplink fusion signaling that combines the registration response, RRCReconfiguraionComplete, and message 5 of the random access process, and the DU on the target side receives the random access process after receiving the seventh uplink fusion signaling message 5, and relay the Registration Request and RRCReconfiguraionComplete to the target side CU-CP-AMF.
  • the message 5 may also be the fifth message in other processes, and the fifth message is a message sent by the terminal device to the network side, and this application does not discuss this Be limited.
  • the eighth uplink converged signaling carries the registration request whose destination is the CU-CP-AMF on the target side, and the message A of the random access procedure whose destination is the DU on the target side.
  • the terminal device sends the eighth uplink fusion signaling that combines the registration request and the message A of the random access process, and the DU on the target side receives the message of the random access process after receiving the eighth uplink fusion signaling A, and relay the registration request to the target side CU-CP-AMF.
  • the message A can also be the first message in other processes, and the first message is a message sent by the terminal device to the network side, and this application does not care about this. Be limited.
  • the registration process of the terminal device in the handover process is combined with the uplink synchronization process of the user through the random access method, so that The NAS signaling of the registration process is integrated with the AS signaling of the random access process.
  • the converged signaling includes downlink converged signaling.
  • the network element device sends downlink fusion signaling to the terminal device, and the terminal device receives the downlink fusion signaling accordingly.
  • the downlink fusion signaling includes at least one of the following:
  • the first downlink converged signaling carries a handover command (Handover Command) whose sender is the source-side CU-CP-AMF, and a message B (MSGB) of a random access procedure whose sender is the source-side DU.
  • Handover Command handover command
  • MSGB message B
  • the source-side DU receives the handover command sent by the source-side CU-CP-AMF, and fuses the handover command and the message B of the random access procedure into the first downlink fusion signaling and sends it to the terminal device.
  • the second downlink converged signaling carries a handover command whose sending end is the source side CU-CP-AMF, and a message 4 (MSG4) of a random access procedure whose sending end is the source side DU.
  • MSG4 message 4
  • the source-side DU receives the handover command sent by the source-side CU-CP-AMF, and fuses the handover command and message 4 of the random access procedure into a second downlink fusion signaling and sends it to the terminal device.
  • the handover command is a signaling for notifying cell handover.
  • the AMF at the source side sends a handover command to the RAN at the source side, and then the RAN at the source side sends the handover command to the terminal device.
  • the message notified by the source-side network element device to the terminal device does not need to be forwarded by the AMF->RAN, which saves related procedures. It only needs to send a switch command to the terminal device by the CU-CP-AMF, and the switch command can be It is considered to be one signaling integrated with the mobility management signaling of the access network and the core network, and the handover command itself is the integrated signaling of the NAS and the AS.
  • the handover command can be fused with AS type message B or message 4. It can be understood that, in addition to the messages in the random access process, message B and message 4 can also be the second message and the fourth message in other processes.
  • the second message and the fourth message are network
  • the message sent sideways to the terminal device is not limited in this application.
  • the third downlink converged signaling carries the registration acceptance that the sender is the target CU-CP-AMF, and the radio resource control setup (RRCSetup) message that the sender is the target CU-CP-AMF.
  • RRCSetup radio resource control setup
  • the CU-CP-AMF on the target side sends the third downlink fusion signaling that integrates registration acceptance and RRCSetup to the terminal device via the relay of the DU on the target side.
  • the registration process of the terminal equipment in the handover process is combined with the RRC configuration process, so that the NAS signaling of the registration process is merged with the AS signaling of the RRC configuration process.
  • FIG. 5 which will not be repeated here.
  • the fourth downlink converged signaling carries a handover command whose sending end is the source-side CU-CP-AMF, and a radio resource control reconfiguration (RRCReconfiguraion) message whose sending end is the source-side CU-CP-AMF.
  • RRCReconfiguraion radio resource control reconfiguration
  • the CU-CP-AMF at the source side sends the fourth downlink fusion signaling that combines the handover command and the RRCReconfiguraion to the terminal device via the relay of the DU at the source side.
  • the handover command can be regarded as a single signaling fused with the mobility management signaling of the access network and the core network, and the handover command itself is the converged signaling of the NAS and the AS. Furthermore, the handover command can be fused with the AS signaling of the RRC reconfiguration procedure.
  • the fifth downlink converged signaling carries the message 4 that the sender is the registration acceptance of the CU-CP-AMF on the target side, and the sender is the random access procedure of the DU on the target side.
  • the target side DU receives the registration acceptance sent by the target side CU-CP-AMF, and fuses the registration acceptance and the message 4 of the random access process into a fifth downlink fusion signaling and sends it to the terminal device.
  • the message 4 can also be the fourth message in other processes, and the fourth message is a message sent by the network side to the terminal device, and this application does not care about it. Be limited.
  • the sixth downlink fusion carries the handover command whose sender is the source-side CU-CP-AMF, the RRCReconfiguraion message whose sender is the source-side CU-CP-AMF, and the user context release command (UEContextReleaseCommand ).
  • the CU-CP-AMF at the source side sends sixth downlink fusion signaling that combines the handover command, RRCReconfiguration and UEContextReleaseCommand to the terminal device via the relay of the source side DU.
  • the handover command can be regarded as a single signaling fused with the mobility management signaling of the access network and the core network, and the handover command itself is the converged signaling of the NAS and the AS.
  • the handover command can be integrated with the AS signaling of the RRC reconfiguration process and the NAS signaling of the UE context release process.
  • the seventh downlink converged signaling carries the message B of the registration acceptance of the CU-CP-AMF on the target side as the sender, and the random access process of the DU on the target side as the sender.
  • the target side DU receives the registration acceptance sent by the target side CU-CP-AMF, and combines the registration acceptance and the message B of the random access process into a seventh downlink fusion signaling and sends it to the terminal device.
  • the message B can also be the second message in other processes.
  • the second message is a message sent by the network side to the terminal device, and this application does not care about it. Be limited.
  • the registration process of the terminal equipment in the handover process is combined with the uplink synchronization process of the user through the random access method, and the NAS signaling of the registration process is combined with AS signaling fusion for random access procedure.
  • the terminal device receives the handover command directly issued by the source side CU-CP-AMF through the source side DU; wherein, the CU-CP-AMF is a function of integrating the access network function and the core network function , A network element used for access and mobility management.
  • the handover command may not be fused with other signaling, instead of being implemented as the first downlink fused signaling or the second downlink fused signaling or the fourth downlink fused signaling or the sixth downlink fused command as described above, directly
  • the CU-CP-AMF on the source side forwards the signaling to the terminal device through the source-side DU on the user plane, which simplifies the processing flow of the signaling.
  • the CU-CP-AMF in the converged network is deployed on any of the following satellites: MEO satellites, GEO satellites, or LEO satellites; the CU-UP-UPF in the converged network is deployed on any of the following On different types of satellites: MEO satellites, GEO satellites, or LEO satellites; DUs in the converged network are deployed on LEO satellites; RUs in the converged network are deployed on LEO satellites; among them, CU-CP-AMF is the converged access network CU-UP-UPF is a network element for data processing and forwarding that integrates access network functions and core network functions.
  • the network element devices in the converged network are deployed on satellites in different orbits.
  • the architecture of the converged network is shown in Figure 2.
  • the deployment scheme of each network element device can be set according to the application scenario of the service. There is no restriction on this.
  • the DU and CU-UP-UPF in the converged network are located in the AS; the CU-CP-AMF in the converged network are located in the AS and NAS; wherein, the CU-CP-AMF is the function of the converged access network and the core network Functional network element for access and mobility management, CU-UP-UPF is a network element for data processing and forwarding that integrates access network functions and core network functions.
  • FIG. 3 for details of the model structure of the AS and NAS of the above-mentioned converged network, which will not be repeated here.
  • the method provided in this embodiment provides a converged network.
  • the converged network includes network elements that integrate the functions of the access network and the core network, and integrates the access network and the core network.
  • the terminal device and the network element equipment in the converged network can transmit a kind of converged signaling, which carries at least two signalings related to the handover process, such as: the converged signaling carries AS signaling and NAS signaling This avoids the need for a separate NAS signaling process for access and mobility management signaling and session management signaling, reduces the overhead of handover signaling transmission, and reduces the risk of signaling storms during the handover process. Reduced switching delay.
  • the technical solution of the converged network can be combined with NTN technology to deploy network elements on satellites in different orbits.
  • the network element device since the converged network includes network elements that integrate the functions of the access network and the core network, the network element device notifies the terminal device of access and mobility management related signaling without going through the AMF- >RAN forwarding, terminal equipment notifies network element equipment access and mobility management related signaling does not need to be forwarded by RAN->AMF, saving related procedures.
  • FIG. 8 shows a flow chart of a handover method provided by an embodiment of the present application, and the method is executed by the DU on the target side.
  • the method may include the steps of:
  • Step 802 During the handover process, the DU on the target side and the terminal equipment transmit fusion signaling, and the fusion signaling carries at least two signalings related to the handover process.
  • the DU is in a converged network
  • the converged network includes network elements with converged access network functions and core network functions.
  • the network elements that integrate access network functions and core network functions include: CU-UP-UPF and CU-CP-AMF.
  • CU-CP-AMF is used for access and mobility management
  • CU-UP-UP is used for data processing and forwarding.
  • the target-side DU and the terminal device when the target-side DU and the terminal device perform a handover process, generally only one signaling related to the handover process is carried in the transmitted signaling, for example, the terminal device and the target-side DU transmit one AS signaling.
  • the merged signaling carries at least two pieces of signaling related to the handover process, for example: the merged signaling carries AS signaling and NAS signaling related to the handover process.
  • the converged signaling directly carries the original NAS signaling to the DU, and then the DU relays the signaling of the user plane and the signaling of the control plane to the user plane and control plane of the converged network.
  • the converged signaling includes uplink converged signaling.
  • the terminal device sends the uplink fusion signaling to the target side DU, and the target side DU receives the uplink fusion signaling accordingly.
  • the uplink fusion signaling includes at least one of the following:
  • the first uplink converged signaling carries the switching confirmation and notification signaling whose destination is the CU-CP-AMF on the target side, and the message A (MSGA) whose destination is the random access procedure of the DU on the target side.
  • the terminal device sends the first uplink fusion signaling that combines the handover confirmation and notification signaling with the message A of the random access process, and after receiving the first uplink fusion signaling, the DU on the target side receives the random access message A of the entry procedure, and relay the handover confirmation and notification signaling to the target side CU-CP-AMF.
  • the second uplink converged signaling carries handover confirmation and notification signaling whose destination is the CU-CP-AMF on the target side, and message 3 (MSG3) whose destination is the random access procedure of the DU on the target side.
  • the terminal device sends the second uplink fusion signaling that combines the handover confirmation and notification signaling with the message 3 of the random access process, and after receiving the second uplink fusion signaling, the DU on the target side receives the random access message 3 of the entry procedure, and relay the handover confirmation and notification signaling to the target side CU-CP-AMF.
  • the handover confirmation and notification signaling can be recorded as Handover Confirm and Notify signaling, and the handover confirmation and notification signaling is used to inform the terminal equipment that it has synchronized to the target cell signaling.
  • the terminal device sends a handover confirmation (Handover Confirm) signaling to the target RAN, and the handover confirmation signaling is used to inform the target RAN that the terminal device has synchronized to the target cell, and then the target RAN sends it to the target AMF Handover Notify (Handover Notify) signaling, which is used to inform the target side that the AMF terminal device has synchronized to the target cell.
  • the message that the terminal device notifies the target network element device does not need to be forwarded by RAN->AMF, which saves related procedures, and only needs to be sent by the terminal device to the CU-CP-AMF for handover confirmation and notification signaling.
  • the handover acknowledgment and notification signaling can be regarded as one signaling fused with the mobility management signaling of the access network and the core network, and the handover acknowledgment and notification signaling itself is the integrated signaling of the NAS and the AS.
  • the handover confirmation and notification signaling can be integrated with AS-type message A or message 3. It can be understood that, besides messages in the random access process, message A and message 3 may also be the first message and the third message in other processes, and the first message and the third message are terminal
  • message sent by the device to the network side is not limited in this application.
  • the sixth uplink converged signaling carries the registration request whose destination is the CU-CP-AMF on the target side, and the message 3 of the random access procedure whose destination is the DU on the target side.
  • the terminal device sends the sixth uplink fusion signaling that combines the registration request and the message 3 of the random access process, and the DU on the target side receives the message of the random access process after receiving the sixth uplink fusion signaling 3, and relay the registration request to the target side CU-CP-AMF.
  • the message 3 may also be the third message in other processes, and the third message is a message sent by the terminal device to the network side, which is not discussed in this application. Be limited.
  • the seventh uplink converged signaling carries a registration response whose destination is the target CU-CP-AMF, a radio resource control reconfiguration complete (RRCReconfigurationComplete) message whose destination is the target CU-CP-AMF, and a DU message whose destination is the target DU. Message 5 of the random access procedure.
  • the terminal device sends the seventh uplink fusion signaling that combines the registration response, RRCReconfiguraionComplete, and message 5 of the random access process, and the DU on the target side receives the random access process after receiving the seventh uplink fusion signaling message 5, and relay the Registration Request and RRCReconfiguraionComplete to the target side CU-CP-AMF.
  • the message 5 may also be the fifth message in other processes, and the fifth message is a message sent by the terminal device to the network side, and this application does not discuss this Be limited.
  • the eighth uplink converged signaling carries the registration request whose destination is the CU-CP-AMF on the target side, and the message A of the random access procedure whose destination is the DU on the target side.
  • the terminal device sends the eighth uplink fusion signaling that combines the registration request and the message A of the random access process, and the DU on the target side receives the message of the random access process after receiving the eighth uplink fusion signaling A, and relay the registration request to the target side CU-CP-AMF.
  • the message A can also be the first message in other processes, and the first message is a message sent by the terminal device to the network side, and this application does not care about this. Be limited.
  • the registration process of the terminal device in the handover process is combined with the uplink synchronization process of the user through the random access method, so that The NAS signaling of the registration process is integrated with the AS signaling of the random access process.
  • the converged signaling includes downlink converged signaling.
  • the DU on the target side sends downlink fusion signaling to the terminal device, and the terminal device receives the downlink fusion signaling accordingly.
  • the downlink fusion signaling includes at least one of the following:
  • the fifth downlink converged signaling carries the message 4 that the sender is the registration acceptance of the CU-CP-AMF on the target side, and the sender is the random access procedure of the DU on the target side.
  • the target side DU receives the registration acceptance sent by the target side CU-CP-AMF, and fuses the registration acceptance and the message 4 of the random access process into a fifth downlink fusion signaling and sends it to the terminal device.
  • the message 4 can also be the fourth message in other processes, and the fourth message is a message sent by the network side to the terminal device, and this application does not care about it. Be limited.
  • the seventh downlink converged signaling carries the message B of the registration acceptance of the CU-CP-AMF on the target side as the sender, and the random access process of the DU on the target side as the sender.
  • the target side DU receives the registration acceptance sent by the target side CU-CP-AMF, and combines the registration acceptance and the message B of the random access process into a seventh downlink fusion signaling and sends it to the terminal device.
  • the message B can also be the second message in other processes.
  • the second message is a message sent by the network side to the terminal device, and this application does not care about it. Be limited.
  • the registration process of the terminal equipment in the handover process is combined with the uplink synchronization process of the user through the random access method, and the NAS signaling of the registration process is combined with AS signaling fusion for random access procedure.
  • the following step is further included: the DU at the target side receives the data directly forwarded by the DU at the source side.
  • the DU in the embodiment of this application is located on the user plane. Therefore, only need to know the address of the DU, you can directly realize the forwarding of data between DUs, without the need to perform the following process: the DU at the source side transmits the data back to the source side The CU-UP-UPF is then forwarded to the DU on the target side.
  • the CU-CP-AMF in the converged network is deployed on any of the following satellites: MEO satellites, GEO satellites, or LEO satellites; the CU-UP-UPF in the converged network is deployed on any of the following On different types of satellites: MEO satellites, GEO satellites, or LEO satellites; DUs in the converged network are deployed on LEO satellites; RUs in the converged network are deployed on LEO satellites; among them, CU-CP-AMF is the converged access network CU-UP-UPF is a network element for data processing and forwarding that integrates access network functions and core network functions.
  • the network element devices in the converged network are deployed on satellites in different orbits.
  • the architecture of the converged network is shown in Figure 2.
  • the deployment scheme of each network element device can be set according to the application scenario of the service. There is no restriction on this.
  • the DU and CU-UP-UPF in the converged network are located in the AS; the CU-CP-AMF in the converged network are located in the AS and NAS; wherein, the CU-CP-AMF is the function of the converged access network and the core network Functional network element for access and mobility management, CU-UP-UPF is a network element for data processing and forwarding that integrates access network functions and core network functions.
  • FIG. 3 for details of the model structure of the AS and NAS of the above-mentioned converged network, which will not be repeated here.
  • the method provided in this embodiment provides a converged network.
  • the converged network includes network elements that integrate the functions of the access network and the core network, and integrates the access network and the core network.
  • the terminal device and the network element equipment in the converged network can transmit a kind of converged signaling, which carries at least two signalings related to the handover process, such as: the converged signaling carries AS signaling and NAS signaling This avoids the need for a separate NAS signaling process for access and mobility management signaling and session management signaling, reduces the overhead of handover signaling transmission, and reduces the risk of signaling storms during the handover process. Reduced switching delay.
  • the technical solution of the converged network can be combined with NTN technology to deploy network elements on satellites in different orbits.
  • the network element device since the converged network includes network elements that integrate the functions of the access network and the core network, the network element device notifies the terminal device of access and mobility management related signaling without going through the AMF- >RAN forwarding, terminal equipment notifies network element equipment access and mobility management related signaling does not need to be forwarded by RAN->AMF, saving related procedures.
  • FIG. 9 shows a flow chart of a handover method provided by an embodiment of the present application, and the method is executed by the DU at the source side.
  • the method may include the steps of:
  • Step 902 During the handover process, the DU at the source side and the terminal device transmit fusion signaling, and the fusion signaling carries at least two pieces of signaling related to the handover process.
  • the DU is in a converged network
  • the converged network includes network elements with converged access network functions and core network functions.
  • the network elements that integrate access network functions and core network functions include: CU-UP-UPF and CU-CP-AMF.
  • CU-CP-AMF is used for access and mobility management
  • CU-UP-UP is used for data processing and forwarding.
  • the source-side DU and the terminal device perform a handover process
  • generally only one signaling related to the handover process is carried in the transmitted signaling, for example, the terminal device and the source-side DU transmit one AS signaling.
  • the integrated signaling carries at least two pieces of signaling related to the handover process, for example, the integrated signaling carries AS signaling and NAS signaling related to the handover process.
  • the converged signaling directly carries the original NAS signaling to the DU, and then the DU relays the signaling of the user plane and the signaling of the control plane to the user plane and control plane of the converged network.
  • the converged signaling includes uplink converged signaling.
  • the terminal device sends the uplink fusion signaling to the source-side DU, and the source-side DU receives the uplink fusion signaling accordingly.
  • the converged signaling includes downlink converged signaling.
  • the DU at the source side sends downlink fusion signaling to the terminal device, and the terminal device receives the downlink fusion signaling accordingly.
  • the downlink fusion signaling includes at least one of the following:
  • the first downlink converged signaling carries a handover command (Handover Command) whose sender is the source-side CU-CP-AMF, and a message B (MSGB) of a random access procedure whose sender is the source-side DU.
  • Handover Command handover command
  • MSGB message B
  • the source-side DU receives the handover command sent by the source-side CU-CP-AMF, and fuses the handover command and the message B of the random access procedure into the first downlink fusion signaling and sends it to the terminal device.
  • the second downlink converged signaling carries a handover command whose sending end is the source side CU-CP-AMF, and a message 4 (MSG4) of a random access procedure whose sending end is the source side DU.
  • MSG4 message 4
  • the source-side DU receives the handover command sent by the source-side CU-CP-AMF, and fuses the handover command and message 4 of the random access procedure into a second downlink fusion signaling and sends it to the terminal device.
  • the handover command is a signaling for notifying cell handover.
  • the AMF at the source side sends a handover command to the RAN at the source side, and then the RAN at the source side sends the handover command to the terminal device.
  • the message notified by the source-side network element device to the terminal device does not need to be forwarded by the AMF->RAN, which saves related procedures. It only needs to send a switch command to the terminal device by the CU-CP-AMF, and the switch command can be It is considered to be one signaling integrated with the mobility management signaling of the access network and the core network, and the handover command itself is the integrated signaling of the NAS and the AS.
  • the handover command can be fused with AS type message B or message 4. It can be understood that, in addition to the messages in the random access process, message B and message 4 can also be the second message and the fourth message in other processes.
  • the second message and the fourth message are network
  • the message sent sideways to the terminal device is not limited in this application.
  • the following step is further included: the DU at the source side directly forwards data to the DU at the target side.
  • the DU in the embodiment of this application is located on the user plane. Therefore, only need to know the address of the DU, you can directly realize the forwarding of data between DUs, without the need to perform the following process: the DU at the source side transmits the data back to the source side The CU-UP-UPF is then forwarded to the DU on the target side.
  • the CU-CP-AMF in the converged network is deployed on any of the following satellites: MEO satellites, GEO satellites, or LEO satellites; the CU-UP-UPF in the converged network is deployed on any of the following On different types of satellites: MEO satellites, GEO satellites, or LEO satellites; DUs in the converged network are deployed on LEO satellites; RUs in the converged network are deployed on LEO satellites; among them, CU-CP-AMF is the converged access network CU-UP-UPF is a network element for data processing and forwarding that integrates access network functions and core network functions.
  • the network element devices in the converged network are deployed on satellites in different orbits.
  • the architecture of the converged network is shown in Figure 2.
  • the deployment scheme of each network element device can be set according to the application scenario of the service. There is no restriction on this.
  • the DU and CU-UP-UPF in the converged network are located in the AS; the CU-CP-AMF in the converged network are located in the AS and NAS; wherein, the CU-CP-AMF is the function of the converged access network and the core network Functional network element for access and mobility management, CU-UP-UPF is a network element for data processing and forwarding that integrates access network functions and core network functions.
  • FIG. 3 for details of the model structure of the AS and NAS of the above-mentioned converged network, which will not be repeated here.
  • the method provided in this embodiment provides a converged network.
  • the converged network includes network elements that integrate the functions of the access network and the core network, and integrates the access network and the core network.
  • the terminal device and the network element equipment in the converged network can transmit a kind of converged signaling, which carries at least two signalings related to the handover process, such as: the converged signaling carries AS signaling and NAS signaling This avoids the need for a separate NAS signaling process for access and mobility management signaling and session management signaling, reduces the overhead of handover signaling transmission, and reduces the risk of signaling storms during the handover process. Reduced switching delay.
  • the technical solution of the converged network can be combined with NTN technology to deploy network elements on satellites in different orbits.
  • the network element device since the converged network includes network elements that integrate the functions of the access network and the core network, the network element device notifies the terminal device of access and mobility management related signaling without going through the AMF- >RAN forwarding, terminal equipment notifies network element equipment access and mobility management related signaling does not need to be forwarded by RAN->AMF, saving related procedures.
  • FIG. 10 shows a flow chart of a handover method provided by an embodiment of the present application.
  • the method is executed by the CU-CP-AMF on the target side, and the CU-CP-AMF integrates the access network function and the core network function.
  • the method may include the steps of:
  • Step 1002 During the handover process, the CU-CP-AMF on the target side and the terminal equipment transmit fusion signaling, and the fusion signaling carries at least two signalings related to the handover process.
  • the CU-CP-AMF is a network element that integrates access network functions and core network functions, and is located in the integrated network.
  • the network element that integrates access network functions and core network functions in the converged network further includes: CU-UP-UPF.
  • CU-CP-AMF is used for access and mobility management
  • CU-UP-UP is used for data processing and forwarding.
  • the terminal device and the AMF when the terminal device and the AMF perform a handover process, generally only one signaling related to the handover process is carried in the signaling transmitted, for example, the terminal device and the AMF transmit one NAS signaling.
  • the signaling processes of the AS and the NAS no longer need to be relatively independent, and the terminal device and the target side CU-CP-AMF can A kind of fused signaling is transmitted, and the fused signaling carries at least two pieces of signaling related to the handover process, for example, the fused signaling carries AS signaling and NAS signaling related to the handover process.
  • the fused signaling carries AS signaling and NAS signaling related to the handover process.
  • the converged signaling directly carries the original NAS signaling to the DU, and then the DU relays the signaling of the user plane and the signaling of the control plane to the user plane and control plane of the converged network. noodle.
  • the converged signaling includes uplink converged signaling.
  • the terminal device sends the uplink fusion signaling to the target side CU-CP-AMF, and the target side CU-CP-AMF receives the uplink fusion signaling accordingly.
  • the uplink fusion signaling includes at least one of the following:
  • the third uplink fusion signaling carries handover confirmation and notification signaling whose destination is the target CU-CP-AMF, and a radio resource control reconfiguration complete (RRCReconfigurationComplete) message whose destination is the target CU-CP-AMF.
  • RRCReconfigurationComplete radio resource control reconfiguration complete
  • the terminal device sends the third uplink fusion signaling that combines the handover confirmation and notification signaling and RRCReconfiguraionComplete, and after receiving the third uplink fusion signaling, the target side DU relays it to the target side CU-CP-AMF .
  • the handover confirmation and notification signaling can be recorded as Handover Confirm and Notify signaling, and the handover confirmation and notification signaling is used to notify the terminal device that it has synchronized to the target cell.
  • the terminal device sends a handover confirmation (Handover Confirm) signaling to the target RAN, and the handover confirmation signaling is used to inform the target RAN that the terminal device has synchronized to the target cell, and then the target RAN sends it to the target AMF Handover Notify (Handover Notify) signaling, which is used to inform the target side that the AMF terminal device has synchronized to the target cell.
  • the message that the terminal device notifies the target network element device does not need to be forwarded by RAN->AMF, which saves related procedures, and only needs to be sent by the terminal device to the CU-CP-AMF for handover confirmation and notification signaling.
  • the handover acknowledgment and notification signaling can be regarded as one signaling fused with the mobility management signaling of the access network and the core network, and the handover acknowledgment and notification signaling itself is the integrated signaling of the NAS and the AS.
  • handover confirmation and notification signaling can be integrated with the RRCReconfiguraaionComplete message.
  • the fourth uplink fusion signaling carries a registration request (RegistrationRequest) whose destination is the target CU-CP-AMF, and a radio resource control setup request (RRCSetupRequest) whose destination is the target CU-CP-AMF.
  • RegistrationRequest a registration request
  • RRCSetupRequest a radio resource control setup request
  • the terminal device sends the fourth uplink fusion signaling that combines the registration request and the RRCSetupRequest, and after receiving the fourth uplink fusion signaling, the target side DU relays it to the target side CU-CP-AMF.
  • the fifth uplink converged signaling carries a registration response (RegistrationResponse) whose destination is the target CU-CP-AMF, and a radio resource control setup complete (RRCSetupComplete) message whose destination is the target CU-CP-AMF.
  • RegistrationResponse RegistrationResponse
  • RRCSetupComplete radio resource control setup complete
  • the terminal device sends the fifth uplink fusion signaling that combines the registration response and RRCSetupComplete, and the target side DU relays the fifth uplink fusion signaling to the target side CU-CP-AMF after receiving the fifth uplink fusion signaling.
  • the registration process of the terminal device in the handover process is combined with the RRC configuration process, so that the NAS signaling of the registration process is merged with the AS signaling of the RRC configuration process .
  • the radio resource control setup request (RRCSetupRequest) message and registration request of the terminal device are carried by the first message and directly reported to the converged network to start the registration of the terminal device, registration acceptance (Registration Accept) and wireless
  • the resource control establishment (RRCSetup) message is sent to the terminal device by the second message, and the registration response and the radio resource control establishment completion (RRCSetupComplete) message are reported to the converged network by the third message.
  • This process is the following CU-CP-AMF
  • the execution phase of the handover provides the registration process. Compared with the process before integration, the registration and RRC configuration no longer need to be performed step by step, and the registration process is completed together with the RRC configuration process. Therefore, the delay when the terminal device accesses the network and completes the registration is shorter, and the operation process is simpler .
  • the service request process can also be combined with the RRC configuration process.
  • the service request process includes: as shown in Figure 6 The NAS process of the service request initiated by the terminal device shown in the figure; the NAS process of the service request initiated by the network as shown in FIG. 7 will not be repeated here.
  • the converged signaling includes downlink converged signaling.
  • the CU-CP-AMF on the target side sends downlink fusion signaling to the terminal device, and the terminal device receives the downlink fusion signaling accordingly.
  • the downlink fusion signaling includes at least one of the following:
  • the third downlink converged signaling carries the registration acceptance that the sender is the target CU-CP-AMF, and the radio resource control setup (RRCSetup) message that the sender is the target CU-CP-AMF.
  • RRCSetup radio resource control setup
  • the CU-CP-AMF on the target side sends the third downlink fusion signaling that integrates the registration acceptance and RRCSetup to the terminal device through the forwarding of the target side DU.
  • the registration process of the terminal equipment in the handover process is combined with the RRC configuration process, so that the NAS signaling of the registration process is merged with the AS signaling of the RRC configuration process.
  • FIG. 5 which will not be repeated here.
  • Step 1004 During the handover process, the CU-CP-AMF at the target side and the CU-CP-AMF at the source side transmit fusion signaling, and the fusion signaling carries at least two pieces of signaling related to the handover process. That is to say, converged signaling can also be transmitted between network element devices in the converged network, and the converged signaling carries at least two signalings related to the handover process, so as to integrate different processes in the handover process and further save handover time.
  • the signaling overhead involved in the process reduces the delay required for handover.
  • the converged signaling includes a handover request sent to the source side CU-CP-AMF.
  • the handover request carries an NR1 message migration and a user context creation request.
  • the NR1 message migration is used to transfer the control plane from the source side CU-CP-AMF to The AMF migrates to the CU-CP-AMF on the target side.
  • NR1 is an interface between the terminal equipment and the CU-CP-AMF.
  • the handover process includes a handover preparation phase and a handover execution phase.
  • the handover preparation phase includes a control plane interaction process in which the AMF on the source side requires the AMF on the target side to create a UE context.
  • the handover execution phase includes transferring the control plane of the terminal device from the source side AMF migrates to the control plane interaction process of the AMF on the target side.
  • the handover request carries the NR1 message migration and user context creation request, so that the original handover execution stage and the control plane interaction process of the handover preparation stage in the handover process are integrated and executed.
  • step 1002 and step 1004 are not limited in this embodiment of the present application.
  • the following step is further included: the CU-CP-AMF at the target side directly updates the state of the uplink and downlink locally.
  • the CU-CP-AMF at the target side directly updates the state of the uplink and downlink locally.
  • it is necessary to perform forwarding of uplink and downlink state transition through the N2 interface between the RAN and the AMF, so as to update the uplink and downlink state.
  • the converged network includes network elements that integrate the functions of the converged access network and the core network, so that the access network and the core network are merged, the N2 interface is canceled, and the CU-CP-AMF on the target side can The state of the uplink and downlink is directly updated locally to reduce the overhead of signaling transmission.
  • the CU-CP-AMF in the converged network is deployed on any of the following satellites: MEO satellites, GEO satellites, or LEO satellites; the CU-UP-UPF in the converged network is deployed on any of the following On different types of satellites: MEO satellites, GEO satellites, or LEO satellites; DUs in the converged network are deployed on LEO satellites; RUs in the converged network are deployed on LEO satellites; among them, CU-CP-AMF is the converged access network CU-UP-UPF is a network element for data processing and forwarding that integrates access network functions and core network functions.
  • the network element devices in the converged network are deployed on satellites in different orbits.
  • the architecture of the converged network is shown in Figure 2.
  • the deployment scheme of each network element device can be set according to the application scenario of the service. There is no restriction on this.
  • the DU and CU-UP-UPF in the converged network are located in the AS; the CU-CP-AMF in the converged network are located in the AS and NAS; wherein, the CU-CP-AMF is the function of the converged access network and the core network Functional network element for access and mobility management, CU-UP-UPF is a network element for data processing and forwarding that integrates access network functions and core network functions.
  • FIG. 3 for details of the model structure of the AS and NAS of the above-mentioned converged network, which will not be repeated here.
  • the method provided in this embodiment provides a converged network.
  • the converged network includes network elements that integrate the functions of the access network and the core network, and integrates the access network and the core network.
  • the terminal device and the network element equipment in the converged network can transmit a kind of converged signaling, which carries at least two signalings related to the handover process, such as: the converged signaling carries AS signaling and NAS signaling This avoids the need for a separate NAS signaling process for access and mobility management signaling and session management signaling, reduces the overhead of handover signaling transmission, and reduces the risk of signaling storms during the handover process. Reduced switching delay.
  • the technical solution of the converged network can be combined with NTN technology to deploy network elements on satellites in different orbits.
  • the network element device since the converged network includes network elements that integrate the functions of the access network and the core network, the network element device notifies the terminal device of access and mobility management related signaling without going through the AMF- >RAN forwarding, terminal equipment notifies network element equipment access and mobility management related signaling does not need to be forwarded by RAN->AMF, saving related procedures.
  • FIG. 11 shows a flow chart of a handover method provided by an embodiment of the present application.
  • the method is executed by the CU-CP-AMF at the source side, and the CU-CP-AMF integrates access network functions and core network functions.
  • the method may include the steps of:
  • Step 1102 During the handover process, the CU-CP-AMF at the source side and the terminal equipment transmit fusion signaling, and the fusion signaling carries at least two signalings related to the handover process.
  • the CU-CP-AMF is a network element that integrates access network functions and core network functions, and is located in the integrated network.
  • the network element that integrates access network functions and core network functions in the converged network further includes: CU-UP-UPF.
  • CU-CP-AMF is used for access and mobility management
  • CU-UP-UP is used for data processing and forwarding.
  • the terminal device and the AMF when the terminal device and the AMF perform a handover process, generally only one signaling related to the handover process is carried in the signaling transmitted, for example, the terminal device and the AMF transmit one NAS signaling.
  • the signaling processes of the AS and the NAS no longer need to be relatively independent, and the terminal device and the source-side CU-CP-AMF can A kind of fused signaling is transmitted, and the fused signaling carries at least two pieces of signaling related to the handover process, for example, the fused signaling carries AS signaling and NAS signaling related to the handover process.
  • the fused signaling carries AS signaling and NAS signaling related to the handover process.
  • the converged signaling directly carries the original NAS signaling to the DU, and then the DU relays the signaling of the user plane and the signaling of the control plane to the user plane and control plane of the converged network. noodle.
  • the converged signaling includes uplink converged signaling.
  • the terminal device sends the uplink fusion signaling to the source side CU-CP-AMF, and the source side CU-CP-AMF receives the uplink fusion signaling accordingly.
  • the converged signaling includes downlink converged signaling.
  • the CU-CP-AMF at the source side sends downlink fusion signaling to the terminal device, and the terminal device receives the downlink fusion signaling accordingly.
  • the downlink fusion signaling includes at least one of the following:
  • the fourth downlink converged signaling carries a handover command whose sending end is the source-side CU-CP-AMF, and a radio resource control reconfiguration (RRCReconfiguraion) message whose sending end is the source-side CU-CP-AMF.
  • RRCReconfiguraion radio resource control reconfiguration
  • the CU-CP-AMF at the source side sends the fourth downlink fusion signaling that combines the handover command and the RRCReconfiguraion to the terminal device via the relay of the DU at the source side.
  • the handover command can be regarded as a single signaling fused with the mobility management signaling of the access network and the core network, and the handover command itself is the converged signaling of the NAS and the AS.
  • the handover command can be fused with the AS signaling of the RRC reconfiguration process.
  • the sixth downlink fusion carries the handover command whose sender is the source-side CU-CP-AMF, the RRCReconfiguraion message whose sender is the source-side CU-CP-AMF, and the user context release command (UEContextReleaseCommand ).
  • the CU-CP-AMF at the source side sends sixth downlink fusion signaling that combines the handover command, RRCReconfiguration and UEContextReleaseCommand to the terminal device via the relay of the source side DU.
  • the handover command can be regarded as a single signaling fused with the mobility management signaling of the access network and the core network, and the handover command itself is the converged signaling of the NAS and the AS.
  • the handover command can be integrated with the AS signaling of the RRC reconfiguration process and the NAS signaling of the UE context release process.
  • Step 1104 During the handover process, the CU-CP-AMF at the source side and the CU-CP-AMF at the target side transmit fusion signaling, and the fusion signaling carries at least two pieces of signaling related to the handover process.
  • converged signaling can also be transmitted between network element devices in the converged network, and the converged signaling carries at least two signalings related to the handover process, so as to integrate different processes in the handover process and further save handover time.
  • the signaling overhead involved in the process reduces the delay required for handover.
  • the fusion signaling includes a handover request sent by the CU-CP-AMF on the target side.
  • the handover request carries an NR1 message migration and a user context creation request, and the NR1 message migration is used to switch the control plane from the source side CU-CP-AMF Migrate to the target side CU-CP-AMF.
  • the handover process includes a handover preparation phase and a handover execution phase.
  • the handover preparation phase includes a control plane interaction process in which the AMF on the source side requires the AMF on the target side to create a UE context.
  • the handover execution phase includes transferring the control plane of the terminal device from the source side AMF migrates to the control plane interaction process of the AMF on the target side.
  • the handover request carries the NR1 message migration and user context creation request, so that the original handover execution stage and the control plane interaction process of the handover preparation stage in the handover process are integrated and executed.
  • step 1102 and step 1104 are not limited in this embodiment of the present application.
  • the following steps are further included: the CU-CP-AMF at the source side sends a handover command directly to the terminal device through the DU at the source side.
  • the handover command may not be fused with other signaling, and instead of being implemented as the fourth downlink fused signaling or the sixth downlink fused command as described above, the source side CU-CP-AMF directly passes the source side DU of the user plane. Forwarding to the terminal equipment simplifies the processing flow of the signaling.
  • the following steps are further included: without going through the N2 message notification process, the source side CU-CP-AMF directly sends an SM context release request (Nsmf_PDUSession_ReleaseSMContext Request) to the SMF.
  • Nsmf_PDUSession_ReleaseSMContext Request an SM context release request
  • an N2 message notification process needs to be performed: the target side AMF calls the N2 message notification (Namf_Communication_N2InfoNotify) to notify the source side AMF of the N2 handover notification received from the target side RAN, and the source side AMF The AMF on the side feeds back an N2 message notification acknowledgment (Namf_Communication_N2InfoNotify ACK).
  • the converged network includes network elements that integrate the functions of the converged access network and the core network, so that the access network and the core network are merged, and the N2 interface is canceled, so that there is no need to perform the N2 message notification process
  • the CU-CP-AMF at the source side directly sends the SM context release request to the SMF, which saves signaling overhead.
  • the following steps are further included: when the measurement report reported by the terminal device satisfies the trigger condition, the CU-CP-AMF at the source side directly selects the CU-CP-AMF.
  • the source-side RAN receives the measurement report reported by the terminal device, and when the measurement report reported by the terminal device satisfies the trigger condition, the source-side RAN sends a handover request (Handover Required) to the source-side AMF, and then the source-side AMF Make CU-CP-AMF selection.
  • a handover request Handover Required
  • the S-CU-CP-AMF decides to trigger the handover, the S-CU-CP-AMF directly starts the handover preparation phase, and there is no need to transmit the handover request, which simplifies the handover process and information. command overhead.
  • the following step is further included: the CU-CP-AMF at the source side directly updates the state of the uplink and downlink locally.
  • the converged network includes network elements that integrate the functions of the converged access network and the core network, so that the access network and the core network are merged, and the N2 interface is canceled, and the source side CU-CP-AMF can The state of the uplink and downlink is directly updated locally to reduce the overhead of signaling transmission.
  • the CU-CP-AMF in the converged network is deployed on any of the following satellites: MEO satellites, GEO satellites, or LEO satellites; the CU-UP-UPF in the converged network is deployed on any of the following On different types of satellites: MEO satellites, GEO satellites, or LEO satellites; DUs in the converged network are deployed on LEO satellites; RUs in the converged network are deployed on LEO satellites; among them, CU-CP-AMF is the converged access network CU-UP-UPF is a network element for data processing and forwarding that integrates access network functions and core network functions.
  • the network element devices in the converged network are deployed on satellites in different orbits.
  • the architecture of the converged network is shown in Figure 2.
  • the deployment scheme of each network element device can be set according to the application scenario of the service. There is no restriction on this.
  • the DU and CU-UP-UPF in the converged network are located in the AS; the CU-CP-AMF in the converged network are located in the AS and NAS; wherein, the CU-CP-AMF is the function of the converged access network and the core network Functional network element for access and mobility management, CU-UP-UPF is a network element for data processing and forwarding that integrates access network functions and core network functions.
  • FIG. 3 for details of the model structure of the AS and NAS of the above-mentioned converged network, which will not be repeated here.
  • the method provided in this embodiment provides a converged network.
  • the converged network includes network elements that integrate the functions of the access network and the core network, and integrates the access network and the core network.
  • the terminal device and the network element equipment in the converged network can transmit a kind of converged signaling, which carries at least two signalings related to the handover process, such as: the converged signaling carries AS signaling and NAS signaling This avoids the need for a separate NAS signaling process for access and mobility management signaling and session management signaling, reduces the overhead of handover signaling transmission, and reduces the risk of signaling storms during the handover process. Reduced switching delay.
  • the technical solution of the converged network can be combined with NTN technology to deploy network elements on satellites in different orbits.
  • the network element device since the converged network includes network elements that integrate the functions of the access network and the core network, the network element device notifies the terminal device of access and mobility management related signaling without going through the AMF- >RAN forwarding, terminal equipment notifies network element equipment access and mobility management related signaling does not need to be forwarded by RAN->AMF, saving related procedures.
  • the handover process generally consists of two phases: the handover preparation phase and the handover execution phase.
  • the inter-DU handover between CU-CP-AMF where AS and NAS are partially integrated refers to the inter-DU handover between CU-CP-AMF where AS and NAS are integrated when the handover preparation phase and the handover execution phase are performed separately.
  • the source side DU is marked as S-DU
  • the target side DU is marked as T-DU
  • the source side CU-CP-AMF is marked as S-CU-CP-AMF
  • the target side CU-CP-AMF is marked as S-CU-CP-AMF
  • the target side CU-CP- AMF is recorded as T-CU-CP-AMF.
  • Step 1 The terminal device periodically uploads the measurement report.
  • the information related to the measurement report includes: the measurement value of the A1/A2/A3/A4/A5/A6 event of the terminal device, the location information of the terminal device, the trajectory information of the terminal device, the connection timing information of the terminal device, etc., When one or more measurements meet the handover trigger condition at the same time, the handover process is started.
  • the triggering based on the measured signal strength it is required that the measured signal strength of the serving node and the measured signal strength of the target node satisfy a certain relationship.
  • the measured signal strength of the serving station is lower than that of the target station.
  • the location information and signal strength of the terminal device are used to simultaneously trigger the handover, the distance from the terminal device to the target node is smaller than the distance to the serving node, and any event in A1-A6 is satisfied. Since the terminal device is far away from the control node, in order to make the uploaded measurement signal report effective, it is necessary to extend the sampling period of the L1 layer and the L3 layer of the control node.
  • Step 2 The S-CU-CP-AMF triggers the handover according to the measurement report reported by the terminal equipment, and selects the T-CU-CP-AMF.
  • the S-CU-CP-AMF When the S-CU-CP-AMF decides to trigger the handover, the S-CU-CP-AMF directly starts the handover preparation phase, and no longer needs to transmit the handover requirement (Handover Required), which simplifies the handover process and signaling overhead .
  • the S-CU-CP-AMF judges whether it is under the same CU-CP-AMF, if it is not under the same CU-CP-AMF, the CU-CP-AMF switching process is triggered, and the S-CU-CP-AMF is no longer
  • the terminal equipment provides the service, and the S-CU-CP-AMF selects the T-CU-CP-AMF.
  • Step 3 S-CU-CP-AMF sends a UE context creation request to T-CU-CP-AMF.
  • the S-CU-CP-AMF also needs to notify the T-CU-CP-AMF of the context of the terminal device.
  • the UE context creation request can be recorded as Ncucpamf_communication_CreateUECContext Request.
  • the UE context creation request carries two parts: N2 Information (N2 Information) and UE Context Information (UE Context Information).
  • N2 Information N2 Information
  • UE Context Information UE Context Information
  • the N2 interface is cancelled, therefore, the SM N2 information list (SM N2 Information List) in the N2 information is canceled, and the SM N2 information list remains in the S-CU-CP-AMF.
  • the message is transmitted to the SMF network element through the internal interface.
  • Step 4 The T-CU-CP-AMF sends an SM context update request to the SMF.
  • the T-CU-CP-AMF notifies the SMF to update the SM context through the SM context update request.
  • the SM context update request can be recorded as Nsmf_PDUSession_UpdateSMContext Request.
  • Step 5 The SMF performs CU-UP-UPF selection.
  • Step 6 The SMF interacts with the UPF to distribute tunnel information.
  • Step 7 The SMF sends an SM context update response to the T-CU-CP-AMF.
  • the SMF sends an SM context update response to the T-CU-CP-AMF, and the SM information is carried in the SM context update response.
  • the SM context update response can be denoted as Nsmf_PDUSession_UpdateSMContext Response.
  • Step 8 T-CU-CP-AMF performs PDU switching response supervision.
  • the T-CU-CP-AMF monitors the SM context update response from the SMF.
  • the minimum value of the maximum delay indicator for a PDU session that is a handover candidate gives the maximum time that the CU-CP-AMF can wait for the SM context update response before continuing the DU inter-station handover procedure. expires at max time, or .
  • the CU-CP-AMF continues the handover procedure.
  • Step 9 The T-CU-CP-AMF sends a handover command to the T-DU.
  • the handover command (Handover Command) is used to notify the T-DU to reserve resources.
  • Step ten the T-DU sends a handover notification to the T-CU-CP-AMF.
  • Step eleven the SMF executes session modification.
  • the session modification process includes the interaction between SMF and T-CU-UP-UPF, S-CU-UP-UPF and CU-UP-UPF (PSA).
  • Step 12 T-CU-CP-AMF sends UE context creation response to S-CU-CP-AMF.
  • the UE context creation response can be recorded as Ncucpamf_Communication_CreateUEContext Response.
  • the source side DU is marked as S-DU
  • the target side DU is marked as T-DU
  • the source side CU-CP-AMF is marked as S-CU-CP-AMF
  • the target side CU-CP-AMF is marked as S-CU-CP-AMF
  • the target side CU-CP- AMF is recorded as T-CU-CP-AMF.
  • Step 1 S-CU-CP-AMF sends a switching command to the terminal equipment.
  • the S-CU-CP-AMF since the access network and the core network are integrated, the S-CU-CP-AMF does not need to execute S-AMF->T-RAN, and the handover command is directly issued by the S-CU-CP -AMF forwards the target to source transparent container (Target to Source transparent container) to the terminal device through the S-DU of the user plane, which simplifies the signaling process.
  • the SM forwarding information list includes the T-CU-UP-UPF SM direct forwarding information list, because in the architecture provided by the embodiment of this application, the DU is located on the user plane, therefore, only need to know the DU address, it can be directly realized The forwarding of data between DUs does not need to return the data to the S-CU-UP-UPF and then forward it to the T-DU.
  • the S-CU-CP-AMF uses the list of PDU sessions that cannot be established and the indicated failure reasons to decide whether to continue the DU cross-site handover process.
  • the N2 handover is no longer performed , using a common DU switching scheme, which simplifies the complexity of switching decisions.
  • the state of the uplink and downlink can be directly updated in the S-CU-CP-AMF and the T-CU-CP-AMF, without performing the forwarding of the state transition of the uplink and downlink, which reduces the overhead of signaling transmission.
  • Step 2 The two DU stations directly forward the user data.
  • data can be directly forwarded between two serviced DUs.
  • the uplink data packet is from T-DU to T-CU-UP-UPF and CU-UP-UPF (PSA).
  • Downlink data packets pass from CU-UP-UPF (PSA) to S-CU-UP-UPF to S-DU.
  • PSA CU-UP-UPF
  • S-DU should start forwarding the QoS flow from the S-DU to the T-DU.
  • Step 3 The terminal device sends a handover notification and confirmation signaling to the T-CU-CP-AMF.
  • the terminal device sends a Handover Confirm and Notify (Handover Confirm and Notify) signaling to the T-CU-CP-AMF to inform the target network of the successful handover.
  • the handover notification and confirmation signaling includes CU-CP-AMF identification (CU-CP-AMF UE NGAP ID), DU identification (DU UE NGAP ID), CU-UP-UPF identification (CU-UP- UPF UE NGAP ID), user location information (User Location Information), etc.
  • the message notified by the terminal device to the target station does not need to be forwarded by RAN->AMF, but the integration of AS and NAS.
  • the handover notification and confirmation signaling are the original access network and The signaling of the mobility management of the core network is merged into one signaling.
  • an identification bit needs to be added to the signaling to indicate whether it is an intra-station handover or an inter-station handover.
  • the handover notification and confirmation signaling can be fused with MSGA or MSG3 message or RRCReconfiguraaionComplete message and reported to the network together.
  • the handover command can be fused with MSGB or MSG4 message and carried to the terminal device.
  • T-CU-CP-AMF calls information notification (Ncucpamf_Communication_InfoNotify) to notify S-CU-CP-AMF of the handover notification and confirmation signaling received from the terminal device.
  • S-CU-CP-AMF starts a timer to supervise the release of S-DU and S-CU-UP-UPF resources.
  • the S-CU-CP-AMF invokes the information notification acknowledgment (Ncucpamf_Communication_InfoNotify ACK) to confirm to the T-CU-CP-AMF.
  • Step 4 The S-CU-CP-AMF sends an SM context release request to the SMF.
  • S-CU-CP-AMF if the T-CU-CP-AMF does not accept the PDU session, for example, the Single Network Slice Selection Assistance Information (S-NSSAI) corresponding to the PDU session is not available in the T-CU-CP-AMF , S-CU-CP-AMF triggers the release of the PDU session process through the SM context release request (Nsmf_PDUSession_ReleaseSMContext Request).
  • S-NSSAI Single Network Slice Selection Assistance Information
  • Step 5 The T-CU-CP-AMF sends an SM context update request to the SMF.
  • the SM context update request includes a handover completion message
  • the S-CU-CP-AMF sends a handover completion message to the SMF corresponding to each PDU session to indicate that the DU handover is successful.
  • the S-CU - CP-AMF needs to send SM context update request (Nsmf_PDUSession_UpdateSMContext Request) to SMF, carrying user permanent identifier (Subscription Permanent Identifier, SUPI), PDU session identifier (PDU Session ID), operation type (Operation Type), allowing the SMF to release the allocated CP-UP-UPF address and tunnel ID.
  • PDU sessions handled by the SMF are considered suspended and handover attempts for PDU sessions are terminated.
  • the CU-CP-AMF determines the local data network (Local Area Data Network, LADN) related to the PDU session, and then the CU-CP-AMF provides an indication that the UE appears in the LADN service area (UE presence in LADN service area), If the CU-CP-AMF does not provide the UE presence in LADN service area indication, the SMF determines the LADN corresponding to the Data Network Name (DNN), and then the SMF considers that the terminal device is not within the service area of the LADN.
  • LADN Local Area Data Network
  • Step 6 If a new T-CU-UP-UPF is inserted, or the existing intermediate S-CU-UP-UPF is redistributed, the SMF sends an N4 Session Modification Request (N4 Session Modification Request) to the T-CU-UP- UPF indicates the downlink transmission tunnel information of T-CU-CP-AMF, T-CU-UP-UPF and T-DU. T-CU-UP-UPF sends N4 session modification response (N4 Session Modification Response) to SMF.
  • N4 Session Modification Request N4 Session Modification Request
  • N4 Session Modification Response N4 session modification response
  • Step 7 If CU-UP-UPF is not reallocated, SMF sends N4 Session Modification Request (N4 Session Modification Request) to S-CU-UP-UPF, instructing T-CU-CP-AMF, T-CU-UP-UPF And the downlink transmission tunnel information of the T-DU. Then S-CU-UP-UFP sends N4 Session Modification Response (N4 Session Modification Response) to SMF.
  • N4 Session Modification Request N4 Session Modification Request
  • T-CU-CP-AMF instructing T-CU-CP-AMF, T-CU-UP-UPF And the downlink transmission tunnel information of the T-DU.
  • S-CU-UP-UFP sends N4 Session Modification Response (N4 Session Modification Response) to SMF.
  • Step 8 SMF sends N4 Session Modification Request (N4 Session Modification Request) to CU-UP-UPF (PSA), and CU-UP-UPF (PSA) sends N4 Session Modification Response (N4 Session Modification Response) to SMF.
  • N4 Session Modification Request N4 Session Modification Request
  • PSA CU-UP-UPF
  • PSA N4 Session Modification Response
  • Step 9 The SMF sends an SM context update response to the T-CU-CP-AMF.
  • the SMF When the SMF confirms that the handover is complete, the SMF sends an SM context update response (Nsmf_PDUSession_updateSMContext Response).
  • Step ten the terminal device performs a registration process.
  • the terminal device initiates the mobile registration update process according to the process shown in FIG. 5 , and the T-CU-CP-AMF knows that it is a registration process during the handover process, so the T-CU-CP-AMF only executes part of the registration process.
  • Step 11 After the timer in step 5 expires, the S-CU-CP-AMF sends a UE Context Release Command (UE Context Release Command) to the S-DU and S-CU-UP-UPF.
  • UE Context Release Command UE Context Release Command
  • S-DU and S-CU-UP-UPF release UE-related resources, and return UE Context Release Complete (UE Context Release Complete) message to S-CU-CP-AMF.
  • the source side CU-CP-AMF directly triggers the handover process according to the measurement results, and executes the CU-CP- AMF selects, and no longer performs the transmission required by the handover; in the handover execution phase, the handover command is directly sent to the terminal device, and no longer passes through transparent forwarding; the state transition of the uplink and downlink of the terminal device is directly updated locally, and no longer through N2 Interface forwarding; S-DU and T-DU directly complete data forwarding; merging handover confirmation and handover notification into handover notification and confirmation signaling, directly sent to the target side DU by the terminal device, and then directly obtained by the target side CU-CP-AMF; The N2 information notification process is canceled, and the source side CU-CP-AMF directly sends an SM context release request to the SMF; the release process of indirect data forwarding resources is cancelled.
  • the handover process generally consists of two phases: the handover preparation phase and the handover execution phase.
  • the inter-DU handover between AS and NAS fully integrated CU-CP-AMF refers to the inter-DU handover between AS and NAS integrated CU-CP-AMF in the case of integrated execution of handover preparation phase and handover execution phase.
  • the source side DU is marked as S-DU
  • the target side DU is marked as T-DU
  • the source side CU-CP-AMF is marked as S-CU-CP-AMF
  • the target side CU-CP-AMF is marked as S-CU-CP-AMF
  • the target side CU-CP- AMF is recorded as T-CU-CP-AMF.
  • the air interface configuration in the execution stage can be completed synchronously with the registration process of the NAS layer.
  • Step 1 The terminal device periodically uploads the measurement report.
  • the information related to the measurement report includes: the measurement value of the A1/A2/A3/A4/A5/A6 event of the terminal device, the location information of the terminal device, the trajectory information of the terminal device, the connection timing information of the terminal device, etc., When one or more measurements meet the handover trigger condition at the same time, the handover process is started.
  • the triggering based on the measured signal strength it is required that the measured signal strength of the serving node and the measured signal strength of the target node satisfy a certain relationship.
  • the measured signal strength of the serving station is lower than that of the target station.
  • the location information and signal strength of the terminal device are used to simultaneously trigger the handover, the distance from the terminal device to the target node is smaller than the distance to the serving node, and any event in A1-A6 is satisfied. Since the terminal device is far away from the control node, in order to make the uploaded measurement signal report effective, it is necessary to extend the sampling period of the L1 layer and the L3 layer of the control node.
  • Step 2 The S-CU-CP-AMF triggers the handover according to the measurement report reported by the terminal equipment, and selects the T-CU-CP-AMF.
  • the S-CU-CP-AMF When the S-CU-CP-AMF decides to trigger the handover, the S-CU-CP-AMF directly starts the handover preparation phase, and no longer needs to transmit the handover requirement (Handover Required), which simplifies the handover process and signaling overhead .
  • the S-CU-CP-AMF judges whether it is under the same CU-CP-AMF, if it is not under the same CU-CP-AMF, it will trigger the handover process between CU-CP-AMF, and the S-CU-CP-AMF will no longer be
  • the terminal equipment provides the service, and the S-CU-CP-AMF selects the T-CU-CP-AMF.
  • Step 3 S-CU-CP-AMF sends a handover request to T-CU-CP-AMF, the handover request includes UE context creation request and NR1 message migration, T-CU-CP-AMF sends S-CU-CP-AMF Send Create UE Context Response.
  • T-CU-CP-AMF does not have the context of the terminal device
  • the UE context creation request (Ncucpamf_communication_CreateUEContext Request) in this signaling needs to carry the necessary information required for terminal device switching, and S-CU-CP-AMF also needs The T-CU-CP-AMF is notified of the PDU session.
  • the signaling also includes NR1 message transfer (NR1MessageTransfer), NR1 is the control plane interface between the terminal device and the converged network, and migrates the control plane of the terminal device from S-CU-CP-AMF to T-CU- CP-AMF, then T-CU-CP-AMF responds to this command, sends UE context creation response (Ncucpamf_Communication_CreateUEContext Response), creates UE context.
  • NR1MessageTransfer NR1 is the control plane interface between the terminal device and the converged network, and migrates the control plane of the terminal device from S-CU-CP-AMF to T-CU- CP-AMF, then T-CU-CP-AMF responds to this command, sends UE context creation response (Ncucpamf_Communication_CreateUEContext Response), creates UE context.
  • the UE context creation request carries two parts: N2 Information (N2 Information) and UE Context Information (UE Context Information).
  • N2 Information N2 Information
  • UE Context Information UE Context Information
  • the N2 interface is cancelled, therefore, the SM N2 information list (SM N2 Information List) in the N2 information is canceled, and the SM N2 information list remains in the S-CU-CP-AMF.
  • the message is transmitted to the SMF network element through the internal interface.
  • control plane handover in the original handover execution stage and the handover preparation stage is fused together for execution.
  • Step 4 T-CU-CP-AMF sends a handover request to T-DU.
  • the T-CU-CP-AMF performs access control on the terminal equipment according to the signaling sent by the S-CU-CP, sends a handover request (Handover Request) to the T-DU, and allows the terminal equipment to start random access to in the target network, and notify the S-CU-CP-AMF to allow the terminal device to access the target network.
  • a handover request Handover Request
  • Step 5 The T-DU sends a handover request confirmation to the T-CU-CP-AMF.
  • T-DU responds to the handover and random access of terminal equipment through Handover Request Ack, and reports to the target control node T-CU-CP-AMF.
  • Step 6 The S-CU-CP-AMF sends a switching command to the terminal equipment.
  • the S-CU-CP-AMF sends a handover command to the user according to the access control signaling sent by the T-CU-CP-AMF, informs the user of the relevant information of the target station, and starts the handover process.
  • the handover command can be transmitted after being fused with a radio resource control reconfiguration (RRCReconfiguraion) message.
  • RRCReconfiguraion radio resource control reconfiguration
  • Step 7 The uplink status is transferred to the new network (Uplink Status Transfer).
  • Step 8 the downlink status is transferred to the new network (Downlink Status Transfer).
  • Step 9 Complete the uplink synchronization of the terminal equipment through the random access method.
  • the MSG3 message carries the registration request (Registration Request) message, and forwards it directly to the T-CU-CP-AMF through the T-DU, and then the T-CU-CP-AMF passes the registration acceptance (Registration Accept) message through MSG4 makes a peer-to-peer response to the terminal device, and finally, reports the radio resource control reconfiguration complete (RRCReconfigurationComplete) and registration response (Registration Response) together with the MSG5 message to the target station to complete the handover process of the terminal device.
  • RRCReconfigurationComplete radio resource control reconfiguration complete
  • Registration Response Registration Response
  • the registration request message can also be carried in the MSGA message, and directly forwarded to the T-CU-CP-AMF through the T-DU, and then the T-CU-CP-AMF sends the registration acceptance message to the The end device responds peer-to-peer.
  • the AS messages of MSGA, MSGB, MSG3, MSG4, MSG5, and RRC reconfiguration are integrated with the NAS messages of the registration process, realizing the establishment of AS and NAS between the terminal device and the network.
  • the deep fusion of connections simplifies the two-stage handover process of handover preparation and handover execution into one stage, reducing the number of handshakes in the handover process and reducing signaling overhead.
  • Step ten S-CU-CP-AMF notifies S-DU to release UE context through UE Context Release Command (UE Context Release Command), and notifies SMF corresponding to each PDU.
  • the S-DU releases the UE context and reports to the S-CU-CP-AMF through the UE Context Release Complete command.
  • the UE context release contained in S-CU-CP-AMF is an internal process, which is different from the 5G NR architecture, and this process does not require signaling transmission.
  • the UE context release command (NAS signaling) can be integrated with the handover command in step 6, and directly carried to the S-DU.
  • the source side CU-CP-AMF sends a handover request to the target side CU-CP-AMF, and the command includes NR1 message migration and user context creation commands realize the fusion of the handover preparation phase and the handover execution phase; when the source side CU-CP-AMF sends a handover command to the terminal device, it can be fused with the user context release command and carried to the source side
  • the overhead of signaling is reduced at the DU; in the random access process, the registration process and the response of the handover process are realized through MSG3-MSG5.
  • FIG. 15 shows a block diagram of a switching device provided by an embodiment of the present application.
  • the apparatus has the function of implementing the above example method on the terminal device side, and the function may be implemented by hardware, or may be implemented by executing corresponding software on the hardware.
  • the device may be the terminal device described above, or may be installed in the terminal device.
  • the device is in a converged network, and the converged network includes network elements with converged access network functions and core network functions.
  • the apparatus 1500 may include: a converged signaling transmission module 1502;
  • the integrated signaling transmission module 1502 is configured to transmit integrated signaling with network element equipment during the handover process, where the integrated signaling carries at least two pieces of signaling related to the handover process.
  • the fusion signaling includes uplink fusion signaling, and the uplink fusion signaling includes at least one of the following:
  • the first uplink fusion signaling where the first uplink fusion signaling carries the switching confirmation and notification signaling that the destination is the CU-CP-AMF on the target side, and the message A of the random access process that the destination is the DU on the target side;
  • the second uplink fusion signaling carries the handover confirmation and notification signaling whose destination is the CU-CP-AMF on the target side, and the random Message 3 of the access process;
  • the third uplink fusion signaling where the third uplink fusion signaling carries the handover confirmation and notification signaling that the destination is the target CU-CP-AMF, and the destination is the target CU-CP-AMF RRCReconfiguraionComplete message;
  • a fourth uplink fusion signaling where the fourth uplink fusion signaling carries a registration request whose destination is the CU-CP-AMF on the target side, and an RRCSetupRequest message whose destination is the CU-CP-AMF on the target side;
  • the fifth uplink fusion signaling carries a registration response whose destination is the CU-CP-AMF on the target side, and an RRCSetupComplete message whose destination is the CU-CP-AMF on the target side;
  • the sixth uplink fusion signaling where the sixth uplink fusion signaling carries the registration request whose destination is the CU-CP-AMF on the target side, and the random access procedure whose destination is the DU on the target side message 3;
  • the seventh uplink fusion signaling where the seventh uplink fusion signaling carries the registration response whose destination is the target CU-CP-AMF, the RRCReconfiguraionComplete message whose destination is the target CU-CP-AMF, The message 5 of the random access procedure whose destination is the DU on the target side;
  • the eighth uplink fusion signaling where the eighth uplink fusion signaling carries the registration request whose destination is the CU-CP-AMF on the target side, and the random access procedure whose destination is the DU on the target side message A;
  • the CU-CP-AMF is a network element that integrates access network functions and core network functions and is used for access and mobility management.
  • the fusion signaling includes downlink fusion signaling, and the downlink fusion signaling includes at least one of the following:
  • the first downlink fusion signaling where the first downlink fusion signaling carries a handover command whose sending end is the source side CU-CP-AMF, and a message B of a random access process whose sending end is the source side DU;
  • the second downlink fusion signaling where the second downlink fusion signaling carries the handover command whose sender is the CU-CP-AMF on the source side, and the random access procedure whose sender is the DU on the source side message 4;
  • the third downlink fusion signaling where the third downlink fusion signaling carries the registration acceptance that the sender is the target side CU-CP-AMF, and the sender is the RRCSetup message of the target side CU-CP-AMF;
  • a fourth downlink fusion signaling where the fourth downlink fusion signaling carries the handover command whose sender is the source-side CU-CP-AMF, and the sender is an RRCReconfiguraion message whose sender is the source-side CU-CP-AMF;
  • the fifth downlink fusion signaling where the fifth downlink fusion signaling carries the registration acceptance of the target side CU-CP-AMF at the sending end and the random access procedure at the target side DU at the sending end message 4;
  • the sixth downlink fusion signaling the sixth downlink fusion carries the handover command whose sender is the source-side CU-CP-AMF, the sender is the source-side CU-CP-AMF the RRCReconfiguraion message,
  • the sending end is the user context release command of the source side CU-CP-AMF;
  • the seventh downlink fusion signaling where the seventh downlink fusion signaling carries the registration acceptance of the target side CU-CP-AMF at the sending end and the random access process at the target side DU at the sending end message B;
  • the CU-CP-AMF is a network element that integrates access network functions and core network functions and is used for access and mobility management.
  • the device further includes: a switching command receiving module
  • the switching command receiving module is used to receive the switching command directly issued by the source side CU-CP-AMF through the source side DU;
  • the CU-CP-AMF is a network element that integrates access network functions and core network functions and is used for access and mobility management.
  • the CU-CP-AMF in the converged network is deployed on any of the following satellites: MEO satellites, GEO satellites, or LEO satellites;
  • the CU-UP-UPF in the converged network is deployed on any of the following satellites: the MEO satellite, the GEO satellite, or the LEO satellite;
  • DUs in the converged network are deployed on the LEO satellite;
  • RUs in the converged network are deployed on the LEO satellite;
  • the CU-CP-AMF is a network element that integrates access network functions and core network functions and is used for access and mobility management
  • the CU-UP-UPF is a network element that integrates access network functions and core network functions A network element used for data processing and forwarding.
  • the DU and CU-UP-UPF in the converged network are located in the AS;
  • the CU-CP-AMF in the converged network is located in the AS and NAS;
  • the CU-CP-AMF is a network element that integrates access network functions and core network functions and is used for access and mobility management
  • the CU-UP-UPF is a network element that integrates access network functions and core network functions A network element used for data processing and forwarding.
  • FIG. 16 shows a block diagram of a switching device provided by an embodiment of the present application.
  • the device has the function of realizing the above-mentioned method example on the DU side of the target side, and the function can be realized by hardware, and can also be realized by executing corresponding software by hardware.
  • the device may be the target-side DU described above, or may be set in the target-side DU.
  • the device is in a converged network, and the converged network includes network elements with converged access network functions and core network functions.
  • the apparatus 1600 may include: a converged signaling transmission module 1602;
  • the integrated signaling transmission module 1602 is configured to transmit integrated signaling with the terminal device during the handover process, where the integrated signaling carries at least two pieces of signaling related to the handover process.
  • the fusion signaling includes uplink fusion signaling, and the uplink fusion signaling includes at least one of the following:
  • the first uplink fusion signaling where the first uplink fusion signaling carries the handover confirmation and notification signaling that the destination is the target side CU-CP-AMF, and the message A that the destination is the random access process of the device;
  • the second uplink fusion signaling where the second uplink fusion signaling carries the handover confirmation and notification signaling whose destination is the CU-CP-AMF on the target side, and the random access whose destination is the device process message 3;
  • the sixth uplink converged signaling where the sixth uplink converged signaling carries the registration request whose destination is the target side CU-CP-AMF, and the message 3 whose destination is the random access procedure of the device ;
  • the seventh uplink fusion signaling where the seventh uplink fusion signaling carries the registration response whose destination is the target CU-CP-AMF, the RRCReconfiguraionComplete message whose destination is the target CU-CP-AMF, The message 5 of the random access procedure whose destination is the device;
  • the eighth uplink fusion signaling where the eighth uplink fusion signaling carries the registration request whose destination is the CU-CP-AMF on the target side, and the random access procedure whose destination is the DU on the target side message A;
  • the CU-CP-AMF is a network element that integrates access network functions and core network functions and is used for access and mobility management.
  • the fusion signaling includes downlink fusion signaling, and the downlink fusion signaling includes at least one of the following:
  • the fifth downlink converged signaling where the fifth downlink converged signaling carries the message 4 that the sender is the registration acceptance of the target side CU-CP-AMF and the sender is the random access procedure of the device ;
  • the seventh downlink fusion signaling where the seventh downlink fusion signaling carries the registration acceptance of the target side CU-CP-AMF at the sending end and the random access process at the target side DU at the sending end message B;
  • the CU-CP-AMF is a network element that integrates access network functions and core network functions and is used for access and mobility management.
  • the device further includes: a data receiving module
  • the data receiving module is configured to receive the data directly forwarded by the distribution unit DU at the source side.
  • the CU-CP-AMF in the converged network is deployed on any of the following satellites: MEO satellites, GEO satellites, or LEO satellites;
  • the CU-UP-UPF in the converged network is deployed on any of the following satellites: the MEO satellite, the GEO satellite, or the LEO satellite;
  • DUs in the converged network are deployed on the LEO satellite;
  • RUs in the converged network are deployed on the LEO satellite;
  • the CU-CP-AMF is a network element that integrates access network functions and core network functions and is used for access and mobility management
  • the CU-UP-UPF is a network element that integrates access network functions and core network functions A network element used for data processing and forwarding.
  • the DU and CU-UP-UPF in the converged network are located in the AS;
  • the CU-CP-AMF in the converged network is located in the AS and NAS;
  • the CU-CP-AMF is a network element that integrates access network functions and core network functions and is used for access and mobility management
  • the CU-UP-UPF is a network element that integrates access network functions and core network functions A network element used for data processing and forwarding.
  • FIG. 17 shows a block diagram of a switching device provided by an embodiment of the present application.
  • the device has the function of realizing the method example on the DU side of the source side above, and the function may be realized by hardware, or may be realized by executing corresponding software by hardware.
  • the device may be the source-side DU described above, or it may be set in the source-side DU.
  • the device is in a converged network, and the converged network includes network elements with converged access network functions and core network functions.
  • the apparatus 1700 may include: a converged signaling transmission module 1702;
  • the integrated signaling transmission module 1702 is configured to transmit integrated signaling with the terminal device during the handover process, where the integrated signaling carries at least two pieces of signaling related to the handover process.
  • the fusion signaling includes downlink fusion signaling, and the downlink fusion signaling includes at least one of the following:
  • the first downlink fusion signaling carries the handover command that the sending end is the source side central unit-control plane-access and mobility management CU-CP-AMF, and the sending end is the device Message B of the random access procedure;
  • the second downlink fusion signaling where the second downlink fusion signaling carries the handover command whose sender is the source-side CU-CP-AMF, and the message 4 of the random access procedure whose sender is the device ;
  • the CU-CP-AMF is a network element that integrates access network functions and core network functions and is used for access and mobility management.
  • the device further includes: a data sending module
  • the data sending module is used to directly forward data to the DU on the target side.
  • the CU-CP-AMF in the converged network is deployed on any of the following satellites: MEO satellites, GEO satellites, or LEO satellites;
  • the CU-UP-UPF in the converged network is deployed on any of the following satellites: the MEO satellite, the GEO satellite, or the LEO satellite;
  • DUs in the converged network are deployed on the LEO satellite;
  • RUs in the converged network are deployed on the LEO satellite;
  • the CU-CP-AMF is a network element that integrates access network functions and core network functions and is used for access and mobility management
  • the CU-UP-UPF is a network element that integrates access network functions and core network functions A network element used for data processing and forwarding.
  • the DU and CU-UP-UPF in the converged network are located in the AS;
  • the CU-CP-AMF in the converged network is located in the AS and NAS;
  • the CU-CP-AMF is a network element that integrates access network functions and core network functions and is used for access and mobility management
  • the CU-UP-UPF is a network element that integrates access network functions and core network functions A network element used for data processing and forwarding.
  • FIG. 18 shows a block diagram of a switching device provided by an embodiment of the present application.
  • the device has the function of realizing the above-mentioned method example on the CU-CP-AMF side of the target side, and the function may be realized by hardware, and may also be realized by executing corresponding software by hardware.
  • the device can be the target side CU-CP-AMF introduced above, or it can be set in the target side CU-CP-AMF, the device is in a converged network, and the device is a converged access network function and a core network function ,
  • the apparatus 1800 may include: a converged signaling transmission module 1802;
  • the integrated signaling transmission module 1802 is configured to transmit integrated signaling with the source side CU-CP-AMF during the handover process;
  • the integrated signaling transmission module 1802 is configured to transmit the integrated signaling with the terminal device during the handover process, where the integrated signaling carries at least two pieces of signaling related to the handover process.
  • the fusion signaling includes a handover request sent to the source side CU-CP-AMF, the handover request carries an NR1 message migration and a user context creation request, and the NR1 message migration is used to transfer the The control plane is migrated from the source-side CU-CP-AMF to the target-side CU-CP-AMF.
  • the fusion signaling includes uplink fusion signaling, and the uplink fusion signaling includes at least one of the following:
  • third uplink converged signaling where the third uplink converged signaling carries the handover confirmation and notification signaling whose destination is the device, and the RRCReconfiguraionComplete message whose destination is the device;
  • a fourth uplink converged signaling where the fourth uplink converged signaling carries a registration request whose destination is the device and an RRCSetupRequest message whose destination is the device;
  • a fifth uplink converged signaling where the fifth uplink converged signaling carries a registration response whose destination is the device and an RRCSetupComplete message whose destination is the device.
  • the fusion signaling includes downlink fusion signaling, and the downlink fusion signaling includes:
  • the third downlink converged signaling where the third downlink converged signaling carries the registration acceptance of the device as the sender and the RRCSetup message of the device as the sender.
  • the device further includes: a link state update module
  • the link state update module is used to directly update the state of the uplink and downlink locally.
  • the CU-CP-AMF in the converged network is deployed on any of the following satellites: MEO satellites, GEO satellites, or LEO satellites;
  • the CU-UP-UPF in the converged network is deployed on any of the following satellites: the MEO satellite, the GEO satellite, or the LEO satellite;
  • DUs in the converged network are deployed on the LEO satellite;
  • RUs in the converged network are deployed on the LEO satellite;
  • the CU-UP-UPF is a network element that integrates access network functions and core network functions and is used for data processing and forwarding.
  • the DU and CU-UP-UPF in the converged network are located in the AS;
  • the CU-CP-AMF in the converged network is located in the AS and NAS;
  • the CU-UP-UPF is a network element that integrates access network functions and core network functions and is used for data processing and forwarding.
  • FIG. 19 shows a block diagram of a switching device provided by an embodiment of the present application.
  • the device has the function of implementing the method example on the CU-CP-AMF side of the source side above, and the function may be implemented by hardware, or may be implemented by executing corresponding software on the hardware.
  • This device can be the source-side CU-CP-AMF introduced above, or it can be set in the source-side CU-CP-AMF.
  • the device is in a converged network, and the device is a converged access network function and a core network function.
  • An apparatus for access and mobility management. As shown in FIG. 19, the apparatus 1900 may include: a converged signaling transmission module 1902;
  • the integrated signaling transmission module 1902 is configured to transmit integrated signaling with the CU-CP-AMF on the target side during the handover process;
  • the integrated signaling transmission module 1902 is configured to transmit the integrated signaling with the terminal device during the handover process, where the integrated signaling carries at least two pieces of signaling related to the handover process.
  • the fusion signaling includes a handover request sent by the CU-CP-AMF on the target side, the handover request carries an NR1 message transfer and a user context creation request, and the NR1 message transfer is used to control A plane is migrated from the source-side CU-CP-AMF to the target-side CU-CP-AMF.
  • the fusion signaling includes downlink fusion signaling, and the downlink fusion signaling includes at least one of the following:
  • a fourth downlink fusion signaling where the fourth downlink fusion signaling carries the handover command whose sender is the device, and the RRCReconfiguraion message whose sender is the device;
  • the sixth downlink fusion signaling where the sixth downlink fusion carries the handover command whose sender is the device, the RRCReconfiguraion message whose sender is the device, and the user context release command whose sender is the device.
  • the device further includes: a request sending module
  • the request sending module is used to directly send Nsmf_PDUSession_ReleaseSMContext Request to SMF without going through the N2 message notification process.
  • the device further includes: a switching command sending module
  • the switching command sending module is configured to directly send the switching command to the terminal device through the source side DU.
  • the device further includes: a selection module
  • the selection module is configured to directly perform CU-CP-AMF selection when the measurement report reported by the terminal device satisfies the trigger condition.
  • the device further includes: a link state update module
  • the link state update module is used to directly update the state of the uplink and downlink locally.
  • the CU-CP-AMF in the converged network is deployed on any of the following satellites: MEO satellites, GEO satellites, or LEO satellites;
  • the CU-UP-UPF in the converged network is deployed on any of the following satellites: the MEO satellite, the GEO satellite, or the LEO satellite;
  • DUs in the converged network are deployed on the LEO satellite;
  • RUs in the converged network are deployed on the LEO satellite;
  • the CU-UP-UPF is a network element that integrates access network functions and core network functions and is used for data processing and forwarding.
  • the DU and CU-UP-UPF in the converged network are located in the AS;
  • the CU-CP-AMF in the converged network is located in the AS and NAS;
  • the CU-UP-UPF is a network element that integrates access network functions and core network functions and is used for data processing and forwarding.
  • the device provided by the above embodiment realizes its functions, it only uses the division of the above-mentioned functional modules as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional modules according to actual needs. That is, the content structure of the device is divided into different functional modules to complete all or part of the functions described above.
  • FIG. 20 shows a schematic structural diagram of a communication device (terminal device or source-side DU or target-side DU or source-side CU-CP-AMF or target-side CU-CP-AMF) provided by an embodiment of the present application.
  • the communication device may include: a processor 2001 , a transceiver 2002 and a memory 2003 .
  • the processor 2001 includes one or more processing cores, and the processor 2001 executes various functional applications by running software programs and modules.
  • the transceiver 2002 can be used for receiving and sending information, and the transceiver 2002 can be a communication chip.
  • the memory 2003 may be used to store a computer program, and the processor 2001 is used to execute the computer program, so as to implement various steps performed by the communication device in the foregoing method embodiments.
  • the memory 2003 can be realized by any type of volatile or non-volatile storage device or their combination, and the volatile or non-volatile storage device includes but not limited to: random-access memory (Random-Access Memory, RAM) And read-only memory (Read-Only Memory, ROM), erasable programmable read-only memory (Erasable Programmable Read-Only Memory, EPROM), electrically erasable programmable read-only memory (Electrically Erasable Programmable Read-Only Memory, EEPROM), flash memory or other solid-state storage technologies, compact disc read-only memory (CD-ROM), high-density digital video disc (Digital Video Disc, DVD) or other optical storage, tape cartridges, tapes, disks storage or other magnetic storage devices.
  • RAM Random-Access Memory
  • ROM read-only memory
  • EPROM erasable programmable Read-Only Memory
  • EPROM erasable programmable Read-Only Memory
  • EEPROM Electrically erasable programmable read-only memory
  • the embodiment of the present application also provides a computer-readable storage medium, where a computer program is stored in the storage medium, and the computer program is used to be executed by a processor, so as to implement the above switching method.
  • the computer-readable storage medium may include: a read-only memory (Read-Only Memory, ROM), a random-access memory (Random-Access Memory, RAM), a solid-state hard drive (Solid State Drives, SSD) or an optical disc.
  • the random access memory may include resistive random access memory (Resistance Random Access Memory, ReRAM) and dynamic random access memory (Dynamic Random Access Memory, DRAM).
  • the embodiment of the present application also provides a chip, the chip includes a programmable logic circuit and/or program instructions, and is used to implement the above switching method when the chip is running.
  • the embodiment of the present application also provides a computer program product or computer program, the computer program product or computer program includes computer instructions, the computer instructions are stored in a computer-readable storage medium, and the processor reads from the computer-readable storage medium The medium reads and executes the computer instructions, so as to realize the above switching method.
  • the "indication" mentioned in the embodiments of the present application may be a direct indication, may also be an indirect indication, and may also mean that there is an association relationship.
  • a indicates B which can mean that A directly indicates B, for example, B can be obtained through A; it can also indicate that A indirectly indicates B, for example, A indicates C, and B can be obtained through C; it can also indicate that there is an association between A and B relation.
  • the term "corresponding" may indicate that there is a direct or indirect correspondence between the two, or that there is an association between the two, or that it indicates and is indicated, configuration and is configuration etc.
  • the "plurality” mentioned herein means two or more.
  • “And/or” describes the association relationship of associated objects, indicating that there may be three types of relationships, for example, A and/or B may indicate: A exists alone, A and B exist simultaneously, and B exists independently.
  • the character “/” generally indicates that the contextual objects are an "or” relationship.
  • the numbering of the steps described herein only exemplarily shows a possible sequence of execution among the steps.
  • the above-mentioned steps may not be executed according to the order of the numbers, such as two different numbers
  • the steps are executed at the same time, or two steps with different numbers are executed in the reverse order as shown in the illustration, which is not limited in this embodiment of the present application.
  • the functions described in the embodiments of the present application may be implemented by hardware, software, firmware or any combination thereof.
  • the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium.
  • Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another.
  • a storage media may be any available media that can be accessed by a general purpose or special purpose computer.

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

Abstract

La présente demande relève du domaine technique des communications et concerne un procédé et un appareil de transfert, un dispositif et un support d'enregistrement. Le procédé est appliqué à un équipement terminal d'un réseau convergent, le réseau convergent comprenant un élément de réseau qui intègre une fonction de réseau d'accès et une fonction de réseau cœur. Le procédé comprend les étapes suivantes : dans un processus de transfert, transmission d'une signalisation convergente entre un équipement terminal et un dispositif d'élément de réseau, la signalisation convergente portant au moins deux éléments de signalisation associés au processus de transfert. Au moyen de la solution technique fournie dans les modes de réalisation de la présente demande, le surdébit de transmission de signalisation de transfert peut être réduit, le risque d'une tempête de signalisation dans le processus de transfert est réduit, et le retard de transfert est réduit.
PCT/CN2021/132187 2021-11-22 2021-11-22 Procédé et appareil de transfert, dispositif, et support d'enregistrement WO2023087328A1 (fr)

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PCT/CN2021/132187 WO2023087328A1 (fr) 2021-11-22 2021-11-22 Procédé et appareil de transfert, dispositif, et support d'enregistrement
CN202180101551.5A CN117981390A (zh) 2021-11-22 2021-11-22 切换方法、装置、设备及存储介质

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