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WO2018166317A1 - Procédé de commutation de service, procédé de migration de contexte, et dispositif associé - Google Patents

Procédé de commutation de service, procédé de migration de contexte, et dispositif associé Download PDF

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Publication number
WO2018166317A1
WO2018166317A1 PCT/CN2018/076448 CN2018076448W WO2018166317A1 WO 2018166317 A1 WO2018166317 A1 WO 2018166317A1 CN 2018076448 W CN2018076448 W CN 2018076448W WO 2018166317 A1 WO2018166317 A1 WO 2018166317A1
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Prior art keywords
handover
target
message
context
source
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English (en)
Chinese (zh)
Inventor
帅扬来
刘菁
王岩
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0016—Hand-off preparation specially adapted for end-to-end data sessions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection

Definitions

  • the present application relates to the field of communications technologies, and in particular, to a service switching method, a context migration method, and related devices.
  • GSM Global System for Mobble Communications
  • UMTS Universal Mobile Telecom Systems
  • WLAN Wireless Local Area Network
  • WiMAX World Interoperability for Micrwave
  • the service delay of the Ultra-Reliability and Low-Latency Service is very high.
  • the end-to-end transmission delay of the uplink and downlink is required to be 0.5 ms.
  • the specific services may be included. There are: automatic driving, assisted driving, industrial automatic control and high priority key communication. Due to the requirement of low latency, the URLLC service needs to be deployed at the near end, that is, deployed near the base station, thus saving transmission delay.
  • the present application provides a service switching method, a context migration method, and related devices, which are used to ensure continuity of services.
  • the first aspect of the present application provides a service switching method.
  • the following describes the target distributed control unit DU from the perspective of the distributed control unit DU side:
  • the target distributed control unit DU receives the handover request message sent by the centralized control unit CU, where the handover request message carries the first handover indication information;
  • the first handover indication information carries at least one of the following information: used to indicate the target DU
  • the configuration of the URLLC service for the near-end deployment, the context migration protocol supported by the URLLC service server for indicating the near-end deployment of the source DU, the delay requirement for indicating the URLLC service, and the packet loss rate requirement for indicating the URLLC service The information carried in the first handover indication information is prepared for the handover requirement of the subsequent service.
  • the target DU sends a handover request response message to the CU, where the handover request response message is used by the CU to instruct the UE to initiate access to the target DU; that is, after receiving the handover request response message, the CU may The UE sends an indication message, and the CU indicates that the UE initiates access to the target DU.
  • the handover request response message carries the second handover indication information, where the second handover indication information carries at least one of the following information: an IP address of the target URLLC service server, an IP address of the target local gateway, an indication to support handover, and a negotiation URLLC Server Context Migration Protocol.
  • the source URLLC local server and the target URLLC local server successfully complete the context migration of the UE by using the first handover indication information carried in the handover request message and the second handover indication information carried in the handover request response message; ensuring that the UE is in the process of moving The service continuity of the URLLC service is guaranteed, and the delay and reliability requirements of the URLLC service are met.
  • the target DU after the target DU receives the handover request message sent by the CU, the target DU further performs the following steps:
  • the target DU sends a handover preparation message to the target local server, where the handover preparation message carries the first handover indication information; that is, the handover preparation message also carries at least one of the following information: The switching of the URLLC service of the near-end deployment, the context migration protocol supported by the URLLC service server for indicating the deployment of the source DU, the delay requirement for indicating the URLLC service, and the packet loss rate requirement for indicating the URLLC service;
  • the target DU receives the handover preparation completion message sent by the target local server, where the handover preparation completion message carries the second handover indication information; that is, the handover preparation completion message also carries at least one of the following information: target The IP address of the URLLC service server, the IP address of the target local gateway, the indication to support handover, and the URLLC server context migration protocol after negotiation.
  • the target DU sends a handover preparation message to the target local server, as follows:
  • the target DU sends the handover preparation message to the target local gateway in the target local server, where the handover preparation message further carries the target DU to establish address information allocated by the tunnel between the target local gateway and the target DU.
  • address information allocated by the tunnel between the target local gateway and the target DU.
  • the target DU after the CU instructs the UE to switch to the target DU, the target DU further performs the following steps:
  • the target DU receives a handover complete message sent by the target local server, where the handover complete message is used to indicate that the context migration is successfully completed.
  • the target DU returns a handover complete response message to the target local server.
  • the second aspect of the present application provides a method for switching a service.
  • the following describes from the perspective of the centralized control unit CU side, and the centralized control unit CU performs the following steps:
  • the centralized control unit CU obtains a measurement report; the CU determines, by the measurement report, the target distributed control unit DU selected to initiate the URLLC service switching;
  • the CU After determining the target DU, the CU sends a handover request message to the target DU, where the handover request message carries the first handover indication information;
  • the first handover indication information carries at least one type of information: used to indicate that the target DU is near
  • the switching of the URLLC service deployed by the client the context migration protocol supported by the URLLC service server for indicating the near-end deployment of the source DU, the delay requirement for indicating the URLLC service, and the packet loss rate requirement for indicating the URLLC service
  • the information carried in the first handover indication information is prepared for the handover requirement of the subsequent service.
  • the CU receives the handover request response message sent by the target DU, where the handover request response message carries the second handover indication information;
  • the second handover indication information carries at least one of the following information: the IP address of the target URLLC service server IP address of the target local gateway, indication of support for handover, and URLLC server context migration protocol after negotiation;
  • the CU sends a handover command to the UE, where the handover instruction is used to indicate that the UE initiates access to the target DU, that is, the CU indicates that the UE initiates access to the target DU.
  • the source URLLC local server and the target URLLC local server successfully complete the context migration of the UE by using the first handover indication information carried in the handover request message and the second handover indication information carried in the handover request response message; ensuring that the UE is in the process of moving The service continuity of the URLLC service is guaranteed, and the delay and reliability requirements of the URLLC service are met.
  • the centralized control unit CU obtains a measurement report, which is specifically as follows:
  • the CU receives a measurement report generated by the DU to which the UE belongs to measure the uplink signal sent by the UE. That is, the CU may obtain the measurement report by receiving the measurement report sent by the UE; or, by using the DU to which the UE belongs, to measure the uplink UL signal sent by the UE, generate a measurement report, and send the measurement report to the CU, where the CU receives the DU transmission. The measurement report.
  • the centralized control unit CU after the CU receives the handover request response message sent by the target DU, the centralized control unit CU further performs the following steps:
  • the CU sends a handover initiation message to the source DU, where the handover initiation message carries the second handover indication information; that is, the handover preparation completion message also carries at least one of the following information: the IP address of the target URLLC service server, and the target local IP address of the gateway, indication of support for handover, and URLLC server context migration protocol after negotiation;
  • the CU receives a handover initiation response message sent by the source DU.
  • the centralized control unit CU further performs the following steps:
  • the CU sends a handover start message to the core network CN, where the handover start message carries the IP address of the target local gateway;
  • the CU receives a handover start response message returned by the CN.
  • the third aspect of the present application provides a service switching method.
  • the following describes the target local server from the perspective of the local server side:
  • the target local server receives the handover preparation message sent by the target distributed control unit DU, where the handover preparation message carries the first handover indication information;
  • the first handover indication information carries at least one type of information: used to indicate the target DU
  • the target local server sends a handover preparation completion message to the target DU, so that the target DU sends a handover request response message to the CU, where the handover request response message is used by the CU to instruct the UE to initiate access to the target DU; That is, after receiving the handover request response message, the CU sends an indication message to the UE, and the CU instructs the UE to initiate access to the target DU.
  • the handover preparation completion message carries the second handover indication information; the second handover indication information carries at least one of the following information: an IP address of the target URLLC service server, an IP address of the target local gateway, an indication to support handover, and a negotiation URLLC Server Context Migration Protocol.
  • the source URLLC local server and the target URLLC local server successfully complete the context migration of the UE by using the first handover indication information carried in the handover preparation message and the second handover indication information carried in the handover preparation completion message; ensuring that the UE is in the process of moving The service continuity of the URLLC service is guaranteed, and the delay and reliability requirements of the URLLC service are met.
  • the target local server includes a target local gateway and a target URLLC service server, where the target local server receives a handover preparation message sent by the target DU, where as follows:
  • a handover preparation message sent by the target DU where the handover preparation message further carries the address information allocated by the target DU to establish a tunnel from the target local gateway to the target DU, such as a Transport Layer Address and a GTP. -TEID;
  • the target local gateway sends a first notification message to the target URLLC service server, where the first notification message carries the first handover indication information and the target local gateway establishes a tunnel between the target URLLC service server and the target local gateway.
  • the assigned address information such as the Transport Layer Address and the GTP-TEID;
  • the first handover indication information carries at least one of the following information: a handover of the URLLC service for indicating the near-end deployment of the target DU, and is used to indicate the near end of the source DU
  • the target local server includes a target local gateway and a target URLLC service server, where the target local server sends a handover preparation completion message to the target DU, details as follows:
  • the target URLLC service server sends a second notification message to the target local gateway, and sends the handover preparation completion message to the target DU by using the target local gateway, where the second notification message carries the second handover indication information;
  • the second notification message carries at least one of the following information: an IP address of the target URLLC service server, an IP address of the target local gateway, an indication to support handover, and a negotiated URLLC server context migration protocol.
  • the target local server after the target local server sends a handover preparation complete message to the target DU, the target local server further performs the following:
  • the target local server sends a handover complete message to the target DU, where the handover complete message is used to indicate that the context migration is successfully completed.
  • the target local server receives the handover complete response message returned by the target DU.
  • the fourth aspect of the present application provides a context switching method based on service switching, including the following steps:
  • the source local gateway receives a handover start message sent by the core network CN; the handover start message is used to indicate that the source local gateway performs UE-related context migration;
  • the source local gateway sends a handover start response message to the CN, and the handover start response message is used to indicate that the CN sends a handover requirement message to the target local gateway; that is, the CN sends the handover start response message to the target local
  • the gateway sends a handover request message; the handover requirement message carries the UE-related context information to be migrated, and the UE-related context information is used to indicate that the target local gateway establishes related information of the UE.
  • the target local gateway establishes related information of the UE by using the UE-related context information to be migrated carried in the handover request message, and completes context migration of the UE from the source local gateway to the target local gateway.
  • the source local gateway before the source local gateway sends a handover start response message to the CN, the source local gateway further performs the following:
  • the source local gateway receives the handover initiation message sent by the source distributed control unit DU, and after receiving the handover initiation message, the source local gateway determines to perform the context migration related to the UE; the handover initiation message carries the target URLLC service The IP address of the server and/or the IP address of the target local gateway.
  • the UE related context information includes at least one of the following: a user identifier, a user IP address, a user state, a terminal type, and a terminal capability.
  • the fifth aspect of the present application provides a context switching method based on service switching, including the following steps:
  • the source local gateway sends a context migration request message to the target local gateway;
  • the context migration request message carries the UE-related context information to be migrated, and the UE-related context information is used to indicate that the target local gateway establishes related information of the UE;
  • the source local gateway receives the context migration request response message returned by the target local gateway.
  • the target local gateway establishes related information of the UE, and completes context migration of the UE from the source local gateway to the target local gateway.
  • the source local gateway before the source local gateway sends the context migration request message to the target local gateway, the source local gateway further performs the following:
  • the source local gateway receives the handover initiation message sent by the source distributed control unit DU, and after receiving the handover initiation message, the source local gateway determines to perform the context migration related to the UE; the handover initiation message carries the target URLLC service The IP address of the server and the IP address of the target local gateway.
  • the UE related context information includes at least one of the following: a user identifier, a user IP address, a user state, a terminal type, and a terminal capability.
  • the sixth aspect of the present application provides a service switching based context migration method, which is applied to a local server, where the local server includes a local gateway and a URLLC service server, and the source URLLC service server performs the following steps:
  • the source URLLC service server receives a context transmission initiation message sent by the source local gateway, where the context transmission initiation message carries the IP address of the target URLLC service server;
  • the source URLLC service server sends a context transmission data message to the target URLLC service server, where the context transmission data message carries context information related to the UE to be migrated, and the context information related to the UE is used to indicate that the target URLLC service server completes the UE related context migration;
  • the source URLLC service server After completing the UE-related context migration, the source URLLC service server sends a context transmission initiation response message to the source local gateway, and the context transmission initiation response message is used to indicate that the application layer context transmission is completed.
  • the source local gateway before the source URLLC service server receives the context transmission start message sent by the source local gateway, the source local gateway further performs the following:
  • the source local gateway receives the handover initiation message sent by the source distributed control unit DU, and after receiving the handover initiation message, the source local gateway determines to perform the context migration related to the UE; the handover initiation message carries the target URLLC service The IP address of the server and the IP address of the target local gateway;
  • the source local gateway After completing the UE-related context migration, the source local gateway also performs the following:
  • the source local gateway sends a handover initiation response message to the source DU, and the handover initiation response message is used to indicate that the context migration is successfully completed.
  • the target local gateway is further executed as follows:
  • the target local gateway sends a context transfer completion response message to the target URLLC service server.
  • the target local gateway is further executed as follows:
  • the target local gateway sends a handover complete message to the target DU, where the handover complete message is used to indicate that the context migration is successfully completed.
  • the target local gateway receives the handover complete response message returned by the target DU.
  • the seventh aspect of the present application provides a method for switching a service.
  • the following describes the target site from the perspective of the target site side, and the target site performs the following steps:
  • the target station receives the handover request message sent by the source station, where the handover request message carries the first handover indication information;
  • the first handover indication information carries at least one of the following information: used to indicate that the target site performs near-end deployment.
  • the information carried in the handover indication information is prepared for the handover requirement of the subsequent service.
  • the target station sends a handover request response message to the source site, where the handover request response message is used by the source station to instruct the UE to initiate access to the target site; that is, the source site receives the handover request.
  • an indication message is sent to the UE, and the source station instructs the UE to initiate access to the target station.
  • the handover request response message carries the second handover indication information, where the second handover indication information carries at least one of the following information: an IP address of the target URLLC service server, an IP address of the target local gateway, and a handover support. Indicated, negotiated URLLC server context migration protocol.
  • the source URLLC local server and the target URLLC local server successfully complete the context migration of the UE by using the first handover indication information carried in the handover request message and the second handover indication information carried in the handover request response message; ensuring that the UE is in the process of moving The service continuity of the URLLC service is guaranteed, and the delay and reliability requirements of the URLLC service are met.
  • the target site after the target station receives the handover request message sent by the source station, the target site further performs the following steps:
  • the target station sends a handover preparation message to the target local server, where the handover preparation message carries the first handover indication information; that is, the handover preparation message also carries at least one of the following information: used to indicate that the target site performs the near end
  • the handover preparation message also carries at least one of the following information: used to indicate that the target site performs the near end
  • the switching of the deployed URLLC service the context migration protocol supported by the URLLC service server for indicating the near-end deployment of the source site, the delay requirement for indicating the URLLC service, and the packet loss rate requirement for indicating the URLLC service;
  • the target station receives the handover preparation completion message sent by the target local server, where the handover preparation completion message carries the second handover indication information; that is, the handover preparation completion message also carries at least one of the following information: target URLLC The IP address of the service server, the IP address of the target local gateway, the indication to support the handover, and the URLLC server context migration protocol after negotiation.
  • the target station sends a handover preparation message to the target local server, as follows:
  • the target station sends the handover preparation message to the target local gateway in the target local server, where the handover preparation message further carries the address information allocated by the target station to establish a tunnel from the target local gateway to the target site.
  • address information allocated by the target station to establish a tunnel from the target local gateway to the target site.
  • the target site further performs the following steps:
  • the target site returns a handover complete response message to the target local server.
  • the eighth aspect of the present application provides a service switching method, which is described below from the perspective of a source site side, and the source site performs the following steps:
  • the source station receives the measurement report sent by the UE; and the source station determines, by using the measurement report, the target site selected by the originating URLLC service switching;
  • the source station After determining the target site, the source station sends a handover request message to the target site, where the handover request message carries the first handover indication information; the first handover indication information carries at least one of the following information: used to indicate the target site
  • the configuration of the URLLC service for the near-end deployment, the context migration protocol supported by the URLLC service server for indicating the near-end deployment of the source site, the delay requirement for indicating the URLLC service, and the packet loss rate requirement for indicating the URLLC service The information carried in the first handover indication information is prepared for the handover requirement of the subsequent service.
  • the source station receives the handover request response message sent by the target station, where the handover request response message carries the second handover indication information;
  • the second handover indication information carries at least one type of information: an IP address of the target URLLC service server, IP address of the target local gateway, indication of support for handover, URLLC server context migration protocol after negotiation;
  • the source station sends a handover command to the UE, where the handover instruction is used to indicate that the UE initiates access to the target station, that is, the source station instructs the UE to initiate access to the target station.
  • the source site after the source station receives the handover request response message sent by the target station, the source site performs the following steps:
  • the source station sends a handover initiation message to the source local server, where the handover initiation message carries the second handover indication information; that is, the handover preparation completion message also carries at least one of the following information: the IP address of the target URLLC service server, IP address of the target local gateway, indication of support for handover, URLLC server context migration protocol after negotiation;
  • the source site receives a handover initiation response message sent by the source local server, and the handover initiation response message is used to indicate that the context migration is successfully completed.
  • the source site after the source station sends a handover start message to the source local server, the source site further performs the following steps:
  • the source station sends a handover start message to the core network CN, where the handover start message carries the IP address of the target local gateway;
  • the source station receives a handover start response message returned by the CN.
  • the ninth aspect of the present application provides a service switching method.
  • the following describes the target local server from the perspective of the local server side:
  • the target local server receives the handover preparation message sent by the target station, where the handover preparation message carries the first handover indication information;
  • the first handover indication information carries at least one of the following information: used to indicate that the target site performs near-end deployment The switching of the URLLC service, the context migration protocol supported by the URLLC service server for indicating the near-end deployment of the source site, the delay requirement for indicating the URLLC service corresponding, and the packet loss rate requirement for indicating the URLLC service;
  • the target local server sends a handover preparation completion message to the target site, where the handover preparation completion message is used to indicate that the target station sends a handover request response message to the source site, where the handover request response message is used by the source site to instruct the UE to initiate
  • the source station sends an indication message to the UE, and the source station instructs the UE to initiate access to the target site.
  • the handover preparation completion message carries the second handover indication information; the second handover indication information carries at least one of the following information: an IP address of the target URLLC service server, an IP address of the target local gateway, an indication to support handover, and a negotiated URLLC Server context migration protocol.
  • the source URLLC local server and the target URLLC local server successfully complete the context migration of the UE by using the first handover indication information carried in the handover preparation message and the second handover indication information carried in the handover preparation completion message; ensuring that the UE is in the process of moving The service continuity of the URLLC service is guaranteed, and the delay and reliability requirements of the URLLC service are met.
  • the target local server includes a target local gateway and a target URLLC service server, where the target local server receives a handover preparation message sent by the target station, where as follows:
  • the target local gateway receives a handover preparation message sent by the target station, where the handover preparation message further carries address information allocated by the target station for establishing a tunnel from the target local gateway to the target site, such as a Transport Layer Address and a GTP. -TEID;
  • the target local gateway sends a first notification message to the target URLLC service server, where the first notification message carries the first handover indication information and the target local gateway establishes a tunnel between the target URLLC service server and the target local gateway.
  • Assigned address information such as a Transport Layer Address and a GTP-TEID
  • the first handover indication information carries at least one of the following information: a handover of the URLLC service used to indicate the near-end deployment of the target site, and is used to indicate the near end of the source site.
  • the target local server includes a target local gateway and a target URLLC service server, where the target local server sends a handover preparation completion message to the target site, details as follows:
  • the target URLLC service server sends a second notification message to the target local gateway, and sends the handover preparation completion message to the target station by using the target local gateway, where the second notification message carries the second handover indication information;
  • the second notification message carries at least one of the following information: an IP address of the target URLLC service server, an IP address of the target local gateway, an indication to support handover, and a negotiated URLLC server context migration protocol.
  • the target local server after the target local server sends the handover preparation completion message to the target site, the target local server further performs the following:
  • the target local server sends a handover complete message to the target site, where the handover complete message is used to indicate that the context migration is successfully completed;
  • the target local server receives the handover complete response message returned by the target site.
  • the tenth aspect of the present application provides an access network device, where the access network device includes a transceiver unit and a processing unit;
  • the processing unit is configured to control the transceiver unit to receive a handover request message sent by the centralized control unit CU, where the handover request message carries the first handover indication information;
  • the first handover indication information carries at least one of the following information: The switching of the URLLC service for indicating the target DU to perform the near-end deployment, the context migration protocol supported by the URLLC service server for indicating the near-end deployment of the source DU, the delay requirement for indicating the URLLC service corresponding, and the URLLC service corresponding to the URLLC service Packet loss rate requirement;
  • the processing unit is configured to control the transceiver unit to send a handover request response message to the CU, where the handover request response message is used by the CU to instruct the UE to initiate access to the target DU;
  • the message carries the second handover indication information, where the second handover indication information carries at least one of the following information: an IP address of the target URLLC service server, an IP address of the target local gateway, an indication to support handover, and a URLLC server context migration after the negotiation. protocol.
  • the processing unit is further configured to:
  • the receiving and receiving unit receives the handover preparation completion message sent by the target local server, where the handover preparation completion message carries the second handover indication information.
  • the processing unit is configured to control the sending and receiving unit to send a handover preparation message to a target local server, including:
  • the processing unit is configured to control the transceiver unit to send the handover preparation message to a target local gateway in the target local server, where the handover preparation message further carries the target DU to establish from the target local gateway to the The address information assigned by the tunnel between the target DUs.
  • the processing unit is further configured to:
  • An eleventh aspect of the present application provides an access network device, where the access network device includes a transceiver unit and a processing unit;
  • the processing unit is configured to acquire a measurement report, and determine, according to the measurement report, a target distributed control unit DU selected to initiate a URLLC service switching;
  • the processing unit is configured to control the sending and receiving unit to send a handover request message to the target DU, where the handover request message carries the first handover indication information;
  • the first handover indication information carries at least one of the following information: Indicates the switching of the URLLC service for the near-end deployment of the target DU, the context migration protocol supported by the URLLC service server for indicating the deployment of the source DU, the delay requirement for indicating the URLLC service, and the loss corresponding to the URLLC service.
  • Package rate requirement
  • the processing unit is configured to control the transceiver unit to receive the handover request response message sent by the target DU, where the handover request response message carries the second handover indication information, where the second handover indication information carries at least one of the following information : the IP address of the target URLLC service server, the IP address of the target local gateway, the indication to support handover, and the URLLC server context migration protocol after negotiation;
  • the processing unit is configured to control the transceiver unit to send a handover instruction to the UE, where the handover instruction is used to instruct the UE to initiate access to the target DU.
  • the processing unit configured to obtain a measurement report, includes:
  • the processing unit is configured to control the transceiver unit to receive a measurement report sent by the UE;
  • the processing unit is configured to control the transceiver unit to receive a measurement report generated by the DU to which the UE belongs to measure the uplink signal sent by the UE.
  • the processing unit is configured to control, after the transceiver unit receives the handover request response message sent by the target DU, the processing The unit is also used to:
  • the processing unit is further configured to: :
  • the processing unit is configured to control the transceiver unit to send a handover start message to the core network CN, where the handover start message carries an IP address of the target local gateway;
  • the processing unit is configured to control the transceiver unit to receive a handover start response message returned by the CN.
  • a twelfth aspect of the present application provides a server, the server includes a transceiver unit and a processing unit;
  • the processing unit is configured to control the transceiver unit to receive a handover preparation message sent by the target distributed control unit (DU), where the handover preparation message carries the first handover indication information;
  • the first handover indication information carries at least one of the following information : a handover of the URLLC service for indicating the target DU to perform the near-end deployment, a context migration protocol supported by the URLLC service server for indicating the near-end deployment of the source DU, a delay request for indicating the URLLC service corresponding, and a URL LC service for indicating Corresponding packet loss rate requirements;
  • the processing unit is configured to control the transceiver unit to send a handover preparation completion message to the target DU, so that the target DU sends a handover request response message to the CU, where the handover request response message is used for the CU indication
  • the UE initiates the access to the target DU;
  • the handover preparation completion message carries the second handover indication information;
  • the second handover indication information carries at least one of the following information: the IP address of the target URLLC service server, the target local gateway IP address, indication of support for handover, URLLC server context migration protocol after negotiation.
  • the server includes a target local gateway and a target URL LC service server, where the processing unit is configured to control the transceiver unit to receive a target DU.
  • the handover preparation message sent includes:
  • the processing unit is configured to control the transceiver unit to receive a handover preparation message sent by the target DU, where the handover preparation message further carries the target DU to establish a tunnel from the target local gateway to the target DU Assigned address information;
  • the processing unit is configured to control the transceiver unit to send a first notification message to the target URLLC service server, where the first notification message carries the first handover indication information and the target local gateway is established from the target Address information assigned by the tunnel between the URLLC service server and the target local gateway.
  • the server includes a target local gateway and a target URL LC service server, where the processing unit is configured to control the transceiver unit to send a handover preparation.
  • Completing the message to the target DU includes:
  • the processing unit is configured to determine, according to the first handover indication information, a context migration protocol supported by the source URLLC service server, and determine, according to the context migration protocol supported by the target URLLC service server, a context migration protocol used in the UE mobility process. ;
  • the processing unit is configured to control the transceiver unit to send a second notification message to the target local gateway, and send the handover preparation completion message to the target DU by using the target local gateway, where the second notification message is Carrying the second handover indication information.
  • the processing unit is configured to control, after the transceiver unit sends a handover preparation completion message to the target DU, the processing unit Also used for:
  • a thirteenth aspect of the present application provides a gateway device, where the gateway device includes a transceiver unit and a processing unit;
  • the processing unit is configured to control the transceiver unit to receive a handover start message sent by the core network CN, where the handover start message is used to indicate that the source local gateway performs UE-related context migration;
  • the processing unit is configured to control the sending and receiving unit to send a handover start response message to the CN, where the handover start response message is used to indicate that the CN sends a handover requirement message to a target local gateway;
  • the UE-related context information to be migrated, the UE-related context information is used to indicate that the target local gateway establishes related information of the UE.
  • the processing unit is configured to control the transceiver unit to send a handover start response message to the CN, where the processing unit further Used for:
  • the transceiver unit Controlling, by the transceiver unit, a handover initiation message sent by the source distributed control unit DU, and after receiving the handover initiation message, the source local gateway determines to perform the UE-related context migration; in the handover initiation message
  • the IP address of the target URLLC service server and/or the IP address of the target local gateway are carried.
  • the UE related context information includes at least one of the following: a user identifier, a user IP address, a user state, a terminal type, and a terminal. ability.
  • a fourteenth aspect of the present application provides a gateway device, where the gateway device includes a transceiver unit and a processing unit;
  • the processing unit is configured to control the sending and receiving unit to send a context migration request message to the target local gateway;
  • the context migration request message carries context information related to the UE to be migrated, and the context information related to the UE is used to indicate the location Determining, by the target local gateway, related information of the UE;
  • the processing unit is configured to control the transceiver unit to receive a context migration request response message returned by the target local gateway.
  • the processing unit is configured to control the transceiver unit to send a context migration request message to a target local gateway, where the processing unit further Used for:
  • the transceiver unit Controlling, by the transceiver unit, a handover initiation message sent by the source distributed control unit DU, and after receiving the handover initiation message, the source local gateway determines to perform the UE-related context migration; in the handover initiation message
  • the IP address of the target URLLC service server and the IP address of the target local gateway are carried.
  • the UE related context information includes at least one of the following: a user identifier, a user IP address, a user state, a terminal type, and a terminal. ability.
  • a fifteenth aspect of the present application provides a server, the server includes a transceiver unit and a processing unit, and the server includes a local gateway and a URLLC service server;
  • the processing unit is configured to control the transceiver unit to receive a context transmission initiation message sent by the source local gateway, where the context transmission initiation message carries an IP address of the target URLLC service server;
  • the processing unit is configured to control the sending and receiving unit to send a context transmission data message to the target URLLC service server, where the context transmission data message carries context information related to the UE to be migrated, and the context information related to the UE is used by Instructing the target URLLC service server to complete the UE-related context migration;
  • the processing unit is configured to control the transceiver unit to send a context transmission initiation response message to the source local gateway, where the context transmission initiation response message is used to indicate that the application layer context transmission is completed.
  • the processing unit is configured to control the processing unit before receiving, by the transceiver unit, a context transmission start message sent by a source local gateway. Also used for:
  • the transceiver unit Controlling, by the transceiver unit, a handover initiation message sent by the source distributed control unit DU, and after receiving the handover initiation message, determining to perform a context migration related to the UE;
  • the handover initiation message carries a target URLLC service The IP address of the server and the IP address of the target local gateway;
  • the processing unit is further configured to:
  • the transceiver unit controlling the transceiver unit to send a handover initiation response message to the source DU, where the handover initiation response message is used to indicate that the context migration is successfully completed.
  • the processing unit is further configured to:
  • the processing unit is further configured to:
  • a sixteenth aspect of the present application provides a base station, where the base station includes a transceiver unit and a processing unit;
  • the processing unit is configured to control the transceiver unit to receive a handover request message sent by the source station, where the handover request message carries the first handover indication information, where the first handover indication information carries at least one of the following information:
  • the target site performs the near-end deployment of the URLLC service, the context migration protocol supported by the URLLC service server for indicating the near-end deployment of the source site, the delay requirement for indicating the URLLC service corresponding, and the packet loss corresponding to the URLLC service. Rate requirement
  • the processing unit is configured to control the transceiver unit to send a handover request response message to the source station, where the handover request response message is used by the source station to instruct the UE to initiate access to the target station;
  • the second handover indication information carries the second handover indication information, where the second handover indication information carries at least one of the following information: an IP address of the target URLLC service server, an IP address of the target local gateway, and an indication to support handover. , negotiated URLLC server context migration protocol.
  • the processing unit after the processing unit is configured to control the transceiver unit to receive a handover request message sent by a source station, the processing unit further uses to:
  • the receiving and receiving unit receives the handover preparation completion message sent by the target local server, where the handover preparation completion message carries the second handover indication information.
  • the processing unit configured to control the sending and receiving unit to send a handover preparation message to the target local server, includes:
  • the processing unit is configured to control the transceiver unit to send the handover preparation message to a target local gateway in the target local server, where the handover preparation message further carries the target site to establish from the target local gateway to the The address information assigned by the tunnel between the target sites.
  • the processing unit is further configured to:
  • a seventeenth aspect of the present application provides a base station, where the base station includes a transceiver unit and a processing unit;
  • the processing unit is configured to control the transceiver unit to receive a measurement report sent by the UE, and determine to initiate a URLLC service according to the measurement report. Switch the selected target site;
  • the processing unit is configured to control the sending and receiving unit to send a handover request message to the target station, where the handover request message carries the first handover indication information;
  • the first handover indication information carries at least one of the following information: Indicates the switching of the URLLC service for the near-end deployment of the target site, the context migration protocol supported by the URLLC service server for indicating the near-end deployment of the source site, the delay requirement for indicating the URLLC service, and the loss corresponding to the URLLC service.
  • Package rate requirement
  • the processing unit is configured to control the transceiver unit to receive the handover request response message sent by the target station, where the handover request response message carries the second handover indication information, where the second handover indication information carries at least one of the following information : the IP address of the target URLLC service server, the IP address of the target local gateway, the indication to support handover, and the URLLC server context migration protocol after negotiation;
  • the processing unit is configured to control the transceiver unit to send a handover instruction to the UE, where the handover instruction is used to instruct the UE to initiate access to the target station.
  • the processing unit is configured to control, after the transceiver unit receives the handover request response message sent by the target station, the processing The unit is also used to:
  • the transceiver unit And controlling, by the transceiver unit, a handover initiation response message sent by the source local server, where the handover initiation response message is used to indicate that the context migration is successfully completed.
  • the processing unit after the processing unit is configured to control the transceiver unit to send a handover start message to a source local server, the processing unit further uses to:
  • the eighteenth aspect of the present application provides a server, the server includes a transceiver unit and a processing unit;
  • the processing unit is configured to control the transceiver unit to receive a handover preparation message sent by the target station, where the handover preparation message carries the first handover indication information; the first handover indication information carries at least one of the following information:
  • the target site performs the near-end deployment of the URLLC service, the context migration protocol supported by the URLLC service server for indicating the near-end deployment of the source site, the delay requirement for indicating the URLLC service corresponding, and the packet loss corresponding to the URLLC service. Rate requirement
  • the processing unit is configured to control the sending and receiving unit to send a handover preparation completion message to the target station, where the handover preparation completion message is used to instruct the target station to send a handover request response message to the source site, where the handover request is sent
  • the response message is used by the source station to instruct the UE to initiate the access to the target station;
  • the handover preparation completion message carries the second handover indication information;
  • the second handover indication information carries at least one of the following information: the target URLLC
  • the server includes a target local gateway and a target URLLC service server, where the processing unit is configured to control the transceiver unit to receive a target site.
  • the handover preparation message sent includes:
  • the processing unit is configured to control the transceiver unit to receive a handover preparation message sent by the target station, where the handover preparation message further carries the target station to establish a tunnel from the target local gateway to the target station Assigned address information;
  • the processing unit is configured to control the transceiver unit to send a first notification message to the target URLLC service server, where the first notification message carries the first handover indication information and the target local gateway is established from the target Address information assigned by the tunnel between the URLLC service server and the target local gateway.
  • the server includes a target local gateway and a target URL LC service server, where the processing unit is configured to control the transceiver unit to send a handover preparation Completing the message to the target site includes:
  • the processing unit is configured to determine, according to the first handover indication information, a context migration protocol supported by the source URLLC service server, and determine, according to the context migration protocol supported by the target URLLC service server, a context migration protocol used in the UE mobility process. ;
  • the processing unit is configured to control the transceiver unit to send a second notification message to the target local gateway, and send the handover preparation completion message to the target station by using the target local gateway, where the second notification message is Carrying the second handover indication information.
  • the processing unit is configured to control, after the transceiver unit sends a handover preparation completion message to the target site, the processing unit Also used for:
  • the processing unit is configured to control the transceiver unit to send a handover complete message to the target site, where the handover complete message is used to indicate that the context migration is successfully completed.
  • the processing unit is configured to control the transceiver unit to receive a handover complete response message returned by the target station.
  • a nineteenth aspect of the present application provides a computer readable storage medium having stored therein instructions that, when executed on a computer, cause the computer to perform the methods described in the above aspects.
  • a twentieth aspect of the present application provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform the methods described in the various aspects above.
  • FIG. 1 is a schematic structural diagram of an evolved telecommunication network provided by the present application.
  • FIG. 2 is a schematic structural diagram of a radio access network provided by the present application.
  • FIG. 3 is another schematic structural diagram of a radio access network provided by the present application.
  • FIG. 4 is a schematic flowchart of a method for switching a service provided by the present application.
  • FIG. 5 is another schematic flowchart of a method for switching a service provided by the present application.
  • FIG. 6 is a schematic flowchart of a service switching based context migration method provided by the present application.
  • FIG. 7 is another schematic flowchart of a service switching based context migration method provided by the present application.
  • FIG. 8 is another schematic flowchart of a service switching based context migration method provided by the present application.
  • FIG. 9 is a schematic structural diagram of a network device provided by the present application.
  • FIG. 10 is a schematic structural diagram of a service switching apparatus provided by the present application.
  • FIG. 1 is a schematic structural diagram of an evolved telecommunication network.
  • a user equipment User Equipment, UE
  • an access network a Mobility Management Entity (MME), a Serving Gateway (SGW), a data gateway, a core control entity, and a packet data network are included.
  • MME Mobility Management Entity
  • SGW Serving Gateway
  • PDN Packet Data Network
  • the UE accesses the network through the access network, establishes a tunnel between the access network and the local service gateway under the control of the mobility management entity, and establishes a tunnel between the local service gateway and the data gateway, thereby establishing a UE and a packet data network. Connectivity between. In practical applications, it is also possible to directly establish a tunnel between the UE and the data gateway.
  • the mobility management entity may be responsible for managing UE location information, access authentication, non-access stratum signaling, and signaling security;
  • the local serving gateway is a small-range mobile data anchor of the UE, and is a core network and an access network.
  • the interface entity is responsible for routing and forwarding user data.
  • the core control entity is an entity that records and manages user location information and authentication authorization information;
  • the principle of the tunneling technology is to securely transmit and route data between two endpoint entities by encapsulating the protocol packets transmitted between the two endpoint entities of the tunnel with another protocol.
  • the telecommunications network has established a complete network management and control mechanism.
  • the resources allocated to the user need to be released in time, including the wireless channel, the bearer, various tunnels, and stored information.
  • Some networks support user equipment to access one or more packet data services.
  • the packet data service is identified by an Access Point Name (APN).
  • APN Access Point Name
  • the network side establishes the connectivity of the user to the corresponding data gateway according to the APN.
  • the APN establishes connectivity to the corresponding PDN.
  • the APN of the packet data service that the user needs to access may be pre-configured on the network side or may be provided by the user equipment to the network side.
  • Radio Access Network evolves into a Central Unit (CU) and a Distributed Control Unit (DU). .
  • CU Central Unit
  • DU Distributed Control Unit
  • URLLC Server has the following near-end deployment methods:
  • Deployment mode 1 As shown in Figure 2, the RAN performs CU and DU segmentation, and the URLLC Server is deployed to the near-end location of the DU.
  • one URLLC Server can be connected to one or more DUs; the DU needs to pass through the local gateway ( Local GW) is connected to the URLLC Server; the Local GW can be a function of the RAN or a downward movement of the core network function; if the Local GW has a control plane function, the signaling interaction can be directly performed between the DU and the Local GW to establish The channel for data transmission; otherwise, the establishment of the data transmission channel between the DU and the Local GW requires the participation of the CN and the CU.
  • the URLLC Server can also be deployed to the near-end of the CU in a similar way to the DU near-end.
  • the RAN does not perform function segmentation, that is, a site, such as an LTE eNodeB or an eLTE eNodeB or an NR gNodeB; a URLLC Server can be connected to one or more sites; the site needs to pass the Local GW. Connected to the URLLC Server; the Local GW can be a function of the RAN or a downward movement of the core network function; if the Local GW has a control plane function, the LTE eNodeB/eLTE eNodeB/NR gNodeB and the Local GW can directly perform signaling. Interaction to establish a channel for data transmission; otherwise, the establishment of a data transmission channel between the LTE eNodeB/eLTE eNodeB/NR gNodeB and the Local GW requires the participation of the CN.
  • a site such as an LTE eNodeB or an eLTE eNodeB or an NR gNodeB
  • a URLLC Server
  • the Local GW and the URLLC Server are collectively referred to as a local server (Local Server); a tunnel is established between the Local GW and the URLLC Server, which may be a Generic Routing Encapsulation Protocol. , GRE) or a tunnel defined by a protocol such as the GPRS Turning Protocol (GTP);
  • GRE Generic Routing Encapsulation Protocol
  • GTP GPRS Turning Protocol
  • the user-related source site context and the URLLC Server service context migration may also be supported, that is, the user-related Local GW context may not be migrated to ensure the continuity of the URLLC service.
  • the service continuity guarantee process in the deployment mode 1 is as shown in Figure 4.
  • the centralized control unit CU obtains a measurement report.
  • the CU may obtain the measurement report by receiving the measurement report sent by the UE; or, by using the DU to which the UE belongs, to measure the uplink UL signal sent by the UE, generate a measurement report, and send the measurement report to the CU, where the CU receives the DU.
  • the CU determines to initiate a handover of the URLLC service for the near-end deployment.
  • the CU determines, according to the measurement report, a target distributed control unit DU selected to initiate a URLLC service switch.
  • the CU determines, according to the measurement report, a target DU selected to initiate a URLLC service switch.
  • the CU sends a handover request (Handover Request) message to the target DU, where the handover request message carries the first handover indication information.
  • Handover Request handover request
  • the first handover indication information may be any handover indication information or combination: handover indication (HO Indication), support protocol indication (Support Protocol Indication), latency bound, and ratio of lost packets.
  • the HO Indication is used to indicate the handover of the URLLC service of the target DU for the near-end deployment
  • the Support Protocol Indication is used to indicate the context migration protocol supported by the URLLC Server deployed at the near end of the source DU, such as: SockMi/CXTP/MTCP, etc., latency
  • the bound and ratio of lost packets are the QoS requirements corresponding to the URLLC service. The former is the delay requirement and the latter is the requirement of the packet loss rate.
  • the target DU sends a Handover Preparation message to a target local server, where the handover preparation message carries the first handover indication information.
  • the target DU sends a Handover Preparation message to the target local gateway (Target Local GW) in the target local server; the Target Local GW then notifies the target URLLC service server (Target URLLC Server); the handover preparation message
  • the carried information is the same as the information carried in the handover request message in step 403.
  • the tunnel preparation process can also complete the tunnel between the Target URLLC Server and the Target Local GW, and the tunnel establishment process from the Target Local GW to the Target DU, which is used to transmit the URLLC to be migrated during the UE handover process.
  • the handover preparation message sent by the Target DU to the Target Local Server may carry the address information allocated by the Target DU to establish a tunnel, such as the transport layer address (Transport), in addition to the information carried in the above handover request message. Layer Address) and GTP-TEID.
  • the notification message sent by the Target Local GW to the Target URLLC Server in the Target Local Server may carry the address information allocated by the Target Local GW for establishing the tunnel, such as the Transport Layer Address and the information carried in the above handover request message. GRE information, etc.
  • the Target Local GW and the Target URLLC Server determine whether to allow the UE to perform the migration of the URLLC service according to the received latency bound and ratio of lost packets parameters.
  • the target local server sends a handover preparation complete message to the target DU, where the handover preparation complete message carries the second handover indication information.
  • the Target URLLC Server determines the context migration protocol supported by the Source URLLC server according to the received Support Protocol Indication parameter, and determines the protocol for the context migration used in the UE mobility process according to the context migration protocol supported by the Target URL.
  • the URLLC Server then notifies the Target Local GW, and the Target Local GW sends a Handover Preparation Complete message to the Taret DU.
  • the second handover indication information carried in the handover preparation completion message may be any of the following information or a combination: Target URLLC The IP address of the server, the IP address of the Target Local GW, the HO Support Indication that supports handover, and the URLLC server context migration protocol after negotiation.
  • the handover preparation completion message a tunnel between the Target Local GW and the Target URLLC Server and a tunnel establishment process from the Target DU to the Target Local GW may be completed, and the tunnel is used to transmit the UE to be migrated during the handover process.
  • the URL information is transmitted. Therefore, the second handover indication information carried in the handover preparation completion message sent by the Target Local GW to the target DU may carry the address information allocated by the Target Local GW for establishing the tunnel, including the Transport Layer. Address and GTP-TEID.
  • the notification message sent by the target URLLC server to the Target Local GW may carry the address information allocated by the Target URLLC Server for establishing the tunnel, including the Transport Layer Address and the GRE information, in addition to the above information carried in the handover preparation completion message.
  • the target DU sends a Handover Request Ack message to the CU, where the handover request response message carries the second handover indication information.
  • the CU sends a handover start (Handover Start) message to the source DU, and the handover initiation message carries the second handover indication information.
  • a handover start Handover Start
  • the handover initiation message carries the second handover indication information.
  • the IP address of the Target URLLC Server and the IP address of the Target Local GW and the URLLC server context migration protocol used after negotiation are carried in the handover initiation message.
  • the CU also sends a Handover Begin message to the core network, where the handover start message carries the IP address of the Target Local GW, and the core network needs to perform the Local GW context. migrate.
  • the core network returns a Handover Begin Ack message to the CU; if there is this step, the handover initiation message in this step and step 408 does not carry the IP address of the Target Local GW.
  • the source DU sends the handover start (Handover Start) message to the source local server (Source Local Server), and the handover initiation message carries the second handover indication information.
  • the IP address of the Target URLLC Server and the IP address of the Target Local GW are carried in the handover initiation message; in the Source Local Server, the Source Local GW informs the Source URLLC Server.
  • Source DU sends a Handover Start Ack message to the CU.
  • the CU After receiving the Handover Start Ack message, the CU sends a Handover Command to the UE, where the handover instruction is used to indicate that the UE switches to the target DU.
  • the source local server initiates the UE-related context migration process to a target local server.
  • the source URLLC server in the source local server initiates the UE-related context migration process to the target URLLC service server (Target URLLC Server).
  • the source local gateway (Source Local GW) initiates the UE-related context migration process to the target local gateway (Target Local GW).
  • the UE initiates access to the target DU after receiving the Handover Command command.
  • the source local server sends a Handover Start Ack message to the source DU.
  • the handover initiation response message is used to indicate that the context migration is successfully completed; this indication may be a message, or a parameter carried in the message.
  • the target local server after the target local server completes the context migration, the target local server sends a handover complete (Handover Complete) message to the target DU.
  • a handover complete Handover Complete
  • the handover complete message is used to indicate that the context migration was successfully completed.
  • the target DU returns a Handover Complete Ack message to the target local server.
  • the Local GW can have the control plane function. Therefore, the DU can directly interact with the Local Server to establish a data transmission channel between the two.
  • the Local GW may not have the control plane function, and the information interaction between the DU and the Local Server needs to be implemented by the control of the CU and the CN. It is no longer cumbersome here.
  • the Local Server can also be deployed in the vicinity of the CU.
  • the main processes are basically similar, and the main differences are as follows: 1) switching becomes a switch between the source CU and the target CU; 2) between the DU and the Local Server The interaction is transformed into an interaction between the CU and the Local Server.
  • the service continuity guarantee process in the deployment mode 2 is as shown in Figure 5.
  • the source station receives a measurement report sent by the UE.
  • the source site includes but is not limited to: NR gNodeB, eLTE eNodeB, and LTE eNodeB.
  • the source station determines, according to the measurement report, a target site selected to initiate a URLLC service switch.
  • the source station sends a handover request (Handover Request) message to the target site, where the handover request message carries the first handover indication information.
  • Handover Request handover request
  • the first handover indication information may be any one of the following handover indication information or a combination: HO Indication, Support Protocol Indication, latency bound, ratio of lost packets, where HO Indication indicates that the target DU performs handover of the URL LC service deployed at the near end, Support Protocol
  • the indication is used to indicate the context migration protocol supported by the URLLC Server deployed at the near end of the source DU, such as SockMi/CXTP/MTCP, etc., and the latency bound and ratio of lost packets are the QoS requirements corresponding to the URLLC service.
  • the former is the delay requirement
  • the latter is It is the requirement of the packet loss rate.
  • the target station sends a handover preparation (Handover Preparation) message to a target local server, where the handover preparation message carries the first handover indication information.
  • a handover preparation Handover Preparation
  • the target station sends a Handover Preparation message to the target local gateway (Target Local GW) in the target local server; the Target Local GW then notifies the Target URLLC Server; the parameters carried in the handover preparation message and step 503
  • the information carried in the middle handover request message is the same.
  • the Handover Preparation message sent by the target site to the Target Local Server may carry the address information allocated by the target site for establishing the tunnel, including the Transport Layer Address and the GTP-TEID, in addition to the above information.
  • the notification message sent by the Target Local GW to the Target URLLC Server may carry the address information allocated by the Target Local GW for establishing the tunnel, including the Transport Layer Address and the GTP-TEID.
  • the Target Local GW and the Target URLLC Server determine whether to allow the UE to perform the migration of the URLLC service according to the received latency bound and ratio of lost packets parameters.
  • the target local server sends a handover preparation complete message to the target site, where the handover preparation complete message carries the second handover indication information.
  • the Target URLLC Server determines the context migration protocol supported by the Source URLLC server according to the received Support Protocol Indication parameter, and determines the protocol for the context migration used in the UE mobility process according to the context migration protocol supported by the Target URL.
  • the URLLC Server then notifies the Target Local GW, and the Target Local GW sends a Handover Preparation Complete message to the target site.
  • the second handover indication information carried in the handover preparation completion message may be any of the following information or a combination: Target URLLC The IP address of the server, the IP address of the Target Local GW, the HO Support Indication that supports handover, and the URLLC server context migration protocol after negotiation.
  • the tunnel between the Target Local GW and the Target URLLC Server and the tunnel establishment process from the target site to the Target Local GW may be completed, and the tunnel is used to transmit the UE to be migrated during the handover process.
  • the URLLC service therefore, the Handover Preparation message sent by the Target Local Server to the target station may carry the address information allocated by the Target Local GW for establishing the tunnel, including the Transport Layer Address and the GTP-TEID, in addition to the above information.
  • the message sent by the target URLLC server to the Target Local GW may carry the address information allocated by the Target URLLC Server for establishing the tunnel, including the Transport Layer Address and the GRE information, in addition to the above information.
  • the target station sends a handover request response (Handover Request Ack) message to the source station, where the handover request response message carries the second handover indication information.
  • Handover Request Ack handover request response
  • the source station sends a handover start (Handover Start) message to the source local server (Source Local Server), and the handover initiation message carries the second handover indication information.
  • a handover start Handover Start
  • Source Local Server Source Local Server
  • the switch initiation message carries the IP address of the Target URLLC Server and the IP address of the Target Local GW and the URLLC server context migration protocol used after the negotiation; in the Source Local Server, the Source Local GW informs the Source URLLC Server.
  • the source station also sends a Handover Begin message to the core network, where the handover start message carries the IP address of the Target Local GW, and the core network needs to perform the Local GW context. Migration.
  • the core network returns a Handover Begin Ack message to the source station; if there is this step, the Handover Start message in this step does not carry the IP address of the Target Local GW.
  • the source station sends a handover command (Handover Command) to the UE, where the handover instruction is used to indicate that the UE switches to the target station.
  • a handover command Handover Command
  • the source local server initiates the UE-related context migration process to the target local server.
  • the source URLLC server in the source local server initiates the UE-related context migration process to the target URLLC service server (Target URLLC Server).
  • the source local gateway (Source Local GW) initiates the UE-related context migration process to the target local gateway (Target Local GW).
  • the UE initiates access to the target site after receiving the Handover Command command.
  • the target sites here include but are not limited to: Target NR gNB, Target eLTE eNodeB, Target LTE eNodeB.
  • the source local server sends a Handover Start Ack message to the source site.
  • the handover initiation response message indicates that the context migration has been successfully completed; this indication may be a message, or a parameter carried in the message.
  • the target local server sends a Handover Complete message to the target site.
  • the handover complete message indicates that the context migration was successfully completed.
  • the target station returns a Handover Complete Ack message to the target local server.
  • the Local GW can have the control plane function. Therefore, the site can directly interact with the Local Server to establish a data transmission channel between the two.
  • the Local GW may not have the control plane function, and the information interaction between the site and the Local Server needs to be implemented by forwarding the CU and the CN. It is no longer cumbersome here.
  • the Local GW context migration process related to the UE is as shown in FIG. 6.
  • the deployment mode 2 refer to the Local GW context migration process in deployment mode 1. The details are not mentioned here.
  • the source local GW initiates a context migration process to the target local gateway (Target Local GW).
  • the control plane entity of the core network CN sends a Handover Begin message to the source local gateway (Source Local GW).
  • the handover start message is used to instruct the Source Local GW to perform migration of the UE related context.
  • the source DU sends a Handover Start message to the source local gateway (Source Local GW).
  • the specific procedure refers to step 408 (a) in the embodiment shown in FIG. 4; after receiving the handover initiation message, the source local gateway (Source Local GW) determines to perform context migration.
  • the source local gateway sends a Handover Begin Ack message to the CN.
  • the handover start response message carries the UE-related context information to be migrated; the context information includes, but is not limited to, user identifier, user IP address, user status, terminal type, terminal capability, and the like.
  • the CN sends a Handover Need message to a target local GW.
  • the context information to be migrated is carried in the handover requirement message.
  • the target local gateway establishes context information related to the UE based on the received context information.
  • the context information includes an IP address and the like.
  • the target local gateway (Target Local GW) returns a Handover Need Ack message to the CN.
  • the Local GW context migration process related to the UE is as shown in FIG. 7.
  • the source local gateway initiates a context migration process to the target local gateway.
  • the source DU sends a Handover Start message to the source local gateway (Source Local GW).
  • the specific procedure refers to step 408 in the embodiment shown in FIG. 4; after receiving the handover initiation message, the source local gateway (Source Local GW) determines to perform context migration.
  • the source local gateway sends a context transfer request (Context Transfer Request) message to a target local gateway (Target Local GW).
  • the context-related request message carries the UE-related context to be migrated; the context includes, but is not limited to, user identifier, user IP address, user status, terminal type, terminal capability, and the like.
  • the target local gateway establishes context information related to the UE based on the received context information.
  • the context information includes an IP address and the like.
  • the target local gateway (Target Local GW) replies with a context transfer request (Context Transfer Response) message to the source local gateway (Source Local GW).
  • Context Transfer Response Context Transfer Response
  • the source DU sends a Handover Start message to the source Local GW.
  • the specific process refers to step 408 in the embodiment shown in FIG. 4.
  • the source Local GW determines to perform context migration. .
  • the source Local GW sends a Context Transfer Start message (a cross-layer message) to the source URLLC Server.
  • the IP address of the target URLLC Server is carried in the context transfer initiation message.
  • the source URLLC Server sends a context transfer data (Context Transfer Data) message to the target URLLC Server.
  • the context is transmitted to the target URLLC Server by transmitting the data message through the context.
  • the target URLLC Server After the completion context is established, the target URLLC Server returns a context transfer data reply (Context Transfer Data Reply) message to the source URLLC Server.
  • This interaction can be based on multiple application layer protocols such as CXTP, SockMi, MTCP, etc.
  • the source URLLC Server sends a Context Transfer Start Ack message to the source Local GW to notify the application layer that the context transmission is complete.
  • the notification may be a message or a message. Parameter indication.
  • the source Local GW returns a Handover Start Ack message to the source DU.
  • step 411(a) in the embodiment shown in FIG.
  • the target URLLC Server After completing the application layer context transmission, the target URLLC Server also sends a Context Transfer Complete message to the target Local GW to notify the application layer that the context transmission is completed.
  • the target Local GW sends a Handover Complete message to the target DU.
  • the target DU returns a Handover Complete Ack message to the target Local GW, and the specific procedure refers to step 411 (b) and step 412 in the embodiment shown in FIG.
  • the target Local GW returns a Context Transfer Complete Ack message to the target URLLC Server.
  • FIG. 9 shows an access network device provided by the present application, which may include an input device 901, an output device 902, a processor 903, and a memory 904.
  • the output device in the embodiment of the present application may be a display device.
  • Memory 904 can include read only memory and random access memory and provides instructions and data to processor 903. A portion of the memory 904 may also include a Non-Volatile Random Access Memory (NVRAM).
  • NVRAM Non-Volatile Random Access Memory
  • the memory 904 stores the following elements, executable modules or data structures, or a subset thereof, or an extended set thereof:
  • Operation instructions include various operation instructions for implementing various operations.
  • Operating system Includes a variety of system programs for implementing various basic services and handling hardware-based tasks.
  • the processor 903 is used in the embodiment of the present application to:
  • the control input device 901 receives the handover request message sent by the centralized control unit CU, where the handover request message carries the first handover indication information;
  • the first handover indication information carries at least one type of information: used to indicate that the target DU performs the near end The switching of the deployed URLLC service, the context migration protocol supported by the URLLC service server for indicating the near-end deployment of the source DU, the delay requirement for indicating the URLLC service, and the packet loss rate requirement for indicating the URLLC service;
  • the control output device 902 sends a handover request response message to the CU, where the handover request response message is used by the CU to instruct the UE to initiate access to the target DU; the handover request response message carries the second handover indication information.
  • the second handover indication information carries at least one of the following information: an IP address of the target URLLC service server, an IP address of the target local gateway, an indication to support handover, and a negotiated URLLC server context migration protocol.
  • the processor 903 may also be referred to as a Central Processing Unit (CPU).
  • Memory 904 can include read only memory and random access memory and provides instructions and data to processor 903. A portion of the memory 904 may also include an NVRAM.
  • the components of the access network device are coupled together by a bus system 905.
  • the bus system 905 may include a power bus, a control bus, a status signal bus, and the like in addition to the data bus. However, for clarity of description, various buses are labeled as bus system 905 in the figure.
  • Processor 903 may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the foregoing method may be completed by an integrated logic circuit of hardware in the processor 903 or an instruction in a form of software.
  • the processor 903 may be a general-purpose processor, a digital signal processing (DSP), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or Other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components.
  • DSP digital signal processing
  • ASIC application specific integrated circuit
  • FPGA field-programmable gate array
  • the methods, steps, and logical block diagrams disclosed in the embodiments of the present application can be implemented or executed.
  • the general purpose processor may be a microprocessor or the processor or any conventional processor or the like.
  • the steps of the method disclosed in the embodiments of the present application may be directly implemented by the hardware decoding processor, or may be performed by a combination of hardware and software modules in the decoding processor.
  • the software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like.
  • the storage medium is located in memory 904, and processor 903 reads the information in memory 904 and, in conjunction with its hardware, performs the steps of the above method.
  • the processor 903 controls the input device 901 to receive the handover request message sent by the CU, the processor 903 is further configured to:
  • the control output device 902 sends a handover preparation message to the target local server, where the handover preparation message carries the first handover indication information;
  • the control input device 901 receives the handover preparation completion message sent by the target local server, where the handover preparation completion message carries the second handover indication information.
  • the processor 903 controls the output device 902 to send a handover preparation message to the target local server, including:
  • the processor 903 controls the output device 902 to send the handover preparation message to the target local gateway in the target local server, and the handover preparation message further carries the target DU to establish from the target local gateway to the target DU.
  • the processor 901 is further configured to:
  • the control input device 901 receives a handover complete message sent by the target local server, where the handover complete message is used to indicate that the context migration is successfully completed.
  • Control output device 902 returns a handover complete response message to the target local server.
  • the application also provides an access network device.
  • the structure of the access network device refers to FIG. 9 , which is different from FIG. 9 in that the processor in this embodiment is used to:
  • the control output device sends a handover request message to the target DU, where the handover request message carries the first handover indication information;
  • the first handover indication information carries at least one of the following information: used to indicate that the target DU performs near-end deployment The switching of the URLLC service, the context migration protocol supported by the URLLC service server for indicating the deployment of the source DU, the delay requirement for indicating the URLLC service, and the packet loss rate requirement for indicating the URLLC service;
  • the control input device receives the handover request response message sent by the target DU, where the handover request response message carries the second handover indication information;
  • the second handover indication information carries at least one of the following information: the IP address of the target URLLC service server IP address of the target local gateway, indication of support for handover, and URLLC server context migration protocol after negotiation;
  • the control output device sends a handover instruction to the UE, where the handover instruction is used to instruct the UE to initiate access to the target DU.
  • the processor acquiring the measurement report includes:
  • the control input device receives the measurement report sent by the UE;
  • control input device receives a measurement report generated by the DU to which the UE belongs to measure the uplink signal sent by the UE.
  • the processor controls the input device to receive the handover request response message sent by the target DU, the processor is further configured to:
  • the control output device sends a handover initiation message to the source DU, where the handover initiation message carries the second handover indication information;
  • the control input device receives a handover initiation response message sent by the source DU.
  • the processor controls the output device to send a handover initiation message to the source DU, the processor is further configured to:
  • the control output device sends a handover start message to the core network CN, where the handover start message carries the IP address of the target local gateway;
  • the control input device receives a handover start response message returned by the CN.
  • the present application also provides a server whose structure is referred to FIG. 9. The difference from FIG. 9 is that the processor in this embodiment is used to:
  • the control input device receives the handover preparation message sent by the target distributed control unit DU, where the handover preparation message carries the first handover indication information;
  • the first handover indication information carries at least one type of information: used to indicate that the target DU is near The switching of the URLLC service deployed by the endpoint, the context migration protocol supported by the URLLC service server for indicating the near-end deployment of the source DU, the delay requirement for indicating the URLLC service, and the packet loss rate requirement for indicating the URLLC service;
  • the control output device sends a handover preparation completion message to the target DU, so that the target DU sends a handover request response message to the CU, where the handover request response message is used by the CU to instruct the UE to initiate the target DU.
  • the handover preparation completion message carries the second handover indication information;
  • the second handover indication information carries at least one of the following information: an IP address of the target URLLC service server, an IP address of the target local gateway, and an indication to support handover , negotiated URLLC server context migration protocol.
  • the server includes a target local gateway and a target URL LC service server, and the processor controls the input device to receive the handover preparation message sent by the target DU, including:
  • the control output device sends a first notification message to the target URLLC service server, where the first notification message carries the first handover indication information and the target local gateway is established from the target URLLC service server to the target local Address information assigned by the tunnel between gateways.
  • the server includes a target local gateway and a target URLLC service server
  • the processor controlling the output device to send a handover preparation complete message to the target DU includes:
  • the processor sends a second notification message to the target local gateway, and sends the handover preparation completion message to the target DU by using the target local gateway, where the second notification message carries the second handover indication information.
  • the processor controls the output device to send a handover preparation completion message to the target DU, the processor is further configured to:
  • the control output device sends a handover complete message to the target DU, where the handover complete message is used to indicate that the context migration is successfully completed.
  • the control input device receives a handover complete response message returned by the target DU.
  • the present application further provides a gateway device.
  • the structure of the gateway device is different from that of FIG. 9 in reference to FIG. 9.
  • the processor in this embodiment is used to:
  • the control input device receives a handover start message sent by the core network CN, where the handover start message is used to indicate that the source local gateway performs UE-related context migration;
  • control output device sends a handover start response message to the CN, where the handover start response message is used to indicate that the CN sends a handover requirement message to the target local gateway, where the handover requirement message carries the UE related to the UE to be migrated.
  • Context information the UE related context information is used to indicate that the target local gateway establishes related information of the UE.
  • the processor controls the output device to send a handover start response message to the CN, where the processor is further configured to:
  • the control input device receives a handover initiation message sent by the source distributed control unit DU, and after receiving the handover initiation message, the processor determines to perform context-related migration of the UE; the handover initiation message carries a target The IP address of the URLLC service server and/or the IP address of the target local gateway.
  • the UE related context information includes at least one of the following: a user identifier, a user IP address, a user state, a terminal type, and a terminal capability.
  • the present application further provides a gateway device.
  • the structure of the gateway device is different from that of FIG. 9 in reference to FIG. 9.
  • the processor in this embodiment is used to:
  • the control output device sends a context migration request message to the target local gateway;
  • the context migration request message carries context information related to the UE to be migrated, and the UE related context information is used to indicate that the target local gateway establishes the UE Related information;
  • the control input device receives a context migration request response message returned by the target local gateway.
  • the processor before the processor controls the output device to send a context migration request message to the target local gateway, the processor is further configured to:
  • the control input device receives a handover initiation message sent by the source distributed control unit DU, and after receiving the handover initiation message, the processor determines to perform context-related migration of the UE; the handover initiation message carries a target The IP address of the URLLC service server and the IP address of the target local gateway.
  • the UE related context information includes at least one of the following: a user identifier, a user IP address, a user state, a terminal type, and a terminal capability.
  • the application also provides a server.
  • the structure of the server is as shown in FIG. 9.
  • the server includes a local gateway and a URLLC service server.
  • the difference from FIG. 9 is that the processor in this embodiment is used to:
  • the control input device receives a context transmission initiation message sent by the source local gateway, where the context transmission initiation message carries an IP address of the target URLLC service server;
  • the control output device sends a context transmission data message to the target URLLC service server, where the context transmission data message carries context information related to the UE to be migrated, and the context information related to the UE is used to indicate the target URLLC service server. Completing the UE related context migration;
  • control output device After completing the UE-related context migration, the control output device sends a context transmission initiation response message to the source local gateway, and the context transmission initiation response message is used to indicate that the application layer context transmission is completed.
  • the processor before the processor controls the input device to receive the context transmission start message sent by the source local gateway, the processor is further configured to:
  • the control input device receives a handover initiation message sent by the source distributed control unit DU, and after receiving the handover initiation message, the processor determines to perform context-related migration of the UE; the handover initiation message carries a target The IP address of the URLLC service server and the IP address of the target local gateway;
  • the processor is further configured to:
  • the control output device sends a handover initiation response message to the source DU, and the handover initiation response message is used to indicate that the context migration is successfully completed.
  • the processor is further configured to:
  • the control output device sends a context transfer completion response message to the target URLLC service server.
  • the processor is further configured to:
  • the control output device sends a handover complete message to the target DU, where the handover complete message is used to indicate that the context migration is successfully completed.
  • the control input device receives a handover complete response message returned by the target DU.
  • the present application further provides a base station whose structure is referred to FIG. 9.
  • the difference from FIG. 9 is that the processor in this embodiment is used to:
  • the control input device receives the handover request message sent by the source station, where the handover request message carries the first handover indication information;
  • the first handover indication information carries at least one of the following information: a URLLC for indicating the near-end deployment of the target site
  • the control output device sends a handover request response message to the source station, where the handover request response message is used by the source station to instruct the UE to initiate access to the target site; the handover request response message carries a second handover indication
  • the second handover indication information of the second handover indication information carries at least one of the following information: an IP address of the target URLLC service server, an IP address of the target local gateway, an indication to support handover, and a URLLC server context migration after negotiation protocol.
  • the processor controls the input device to receive the handover request message sent by the source station, the processor is further configured to:
  • the control output device sends a handover preparation message to the target local server, where the handover preparation message carries the first handover indication information;
  • the control input device receives the handover preparation completion message sent by the target local server, where the handover preparation completion message carries the second handover indication information.
  • the processor controlling the output device to send the handover preparation message to the target local server includes:
  • the processor controls the output device to send the handover preparation message to a target local gateway in the target local server, where the handover preparation message further carries the target site to establish a destination from the target local gateway to the target site. Address information assigned by the tunnel.
  • the processor is further configured to:
  • the control input device receives a handover complete message sent by the target local server, where the handover complete message is used to indicate that the context migration is successfully completed;
  • the control output device returns a handover complete response message to the target local server.
  • the present application further provides a base station whose structure is referred to FIG. 9.
  • the difference from FIG. 9 is that the processor in this embodiment is used to:
  • the control input device receives the measurement report sent by the UE;
  • the control output device sends a handover request message to the target site, where the handover request message carries the first handover indication information;
  • the first handover indication information carries at least one of the following information: used to indicate that the target site performs near-end deployment The switching of the URLLC service, the context migration protocol supported by the URLLC service server for indicating the near-end deployment of the source site, the delay requirement for indicating the URLLC service, and the packet loss rate requirement for indicating the URLLC service;
  • the control input device receives the handover request response message sent by the target station, where the handover request response message carries the second handover indication information;
  • the second handover indication information carries at least one of the following information: the IP address of the target URLLC service server IP address of the target local gateway, indication of support for handover, and URLLC server context migration protocol after negotiation;
  • the control output device sends a handover instruction to the UE, where the handover instruction is used to instruct the UE to initiate access to the target site.
  • the processor controls the input device to receive the handover request response message sent by the target station, the processor is further configured to:
  • the control output device sends a handover initiation message to the source local server, where the handover initiation message carries the second handover indication information;
  • the control input device receives a handover initiation response message sent by the source local server, and the handover initiation response message is used to indicate that the context migration is successfully completed.
  • the processor controls the output device to send a handover initiation message to the source local server, the processor is further configured to:
  • the control output device sends a handover start message to the core network CN, where the handover start message carries the IP address of the target local gateway;
  • the control input device receives a handover start response message returned by the CN.
  • the present application also provides a server whose structure is referred to FIG. 9. The difference from FIG. 9 is that the processor in this embodiment is used to:
  • the control input device receives the handover preparation message sent by the target station, where the handover preparation message carries the first handover indication information;
  • the first handover indication information carries at least one of the following information: a URLLC for indicating the near-end deployment of the target site
  • the control output device sends a handover preparation completion message to the target site, where the handover preparation completion message is used to instruct the target station to send a handover request response message to the source site, where the handover request response message is used by the source site Instructing the UE to initiate the access to the target station;
  • the handover preparation completion message carries the second handover indication information;
  • the second handover indication information carries at least one of the following information: the IP address of the target URLLC service server, the target local The IP address of the gateway, the indication to support handover, and the URLLC server context migration protocol after negotiation.
  • the target local server includes a target local gateway and a target URLLC service server
  • the processor controls the input device to receive the handover preparation message sent by the target station, including:
  • the processor control input device receives a handover preparation message sent by the target station, where the handover preparation message further carries an address allocated by the target station to establish a tunnel from the target local gateway to the target site information;
  • the processor controls the output device to send a first notification message to the target URLLC service server, where the first notification message carries the first handover indication information and the target local gateway is established from the target URLLC service server Address information assigned by the tunnel between the target local gateways.
  • the target local server includes a target local gateway and a target URLLC service server
  • the processor controlling the output device to send a handover preparation completion message to the target site includes:
  • the processor controls the output device to send a second notification message to the target local gateway, and sends the handover preparation completion message to the target station by using the target local gateway, where the second notification message carries the Second, the indication information is switched.
  • the processor controls the output device to send a handover preparation completion message to the target site, the processor is further configured to:
  • the control output device sends a handover complete message to the target site, where the handover complete message is used to indicate that the context migration is successfully completed;
  • the control input device receives a handover complete response message returned by the target site.
  • the present application further provides a service switching apparatus.
  • the structure of the service switching apparatus is as shown in FIG. 10.
  • the service switching apparatus in FIG. 10 includes a transceiver unit 1001 and a processing unit 1002.
  • the function of the transceiver unit 1001 can be implemented by combining the input device and the output device in all the embodiments provided in FIG. 9.
  • the function of the processing unit 1002 can be implemented by the processor in all the embodiments provided in FIG. 9, and details are not described herein again.
  • the computer program product includes one or more computer instructions.
  • the computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable device.
  • the computer instructions can be stored in a computer readable storage medium or transferred from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions can be from a website site, computer, server or data center Transfer to another website site, computer, server, or data center by wire (eg, coaxial cable, fiber optic, digital subscriber line (DSL), or wireless (eg, infrared, wireless, microwave, etc.).
  • wire eg, coaxial cable, fiber optic, digital subscriber line (DSL), or wireless (eg, infrared, wireless, microwave, etc.).
  • the computer readable storage medium can be any available media that can be stored by a computer or a data storage device such as a server, data center, or the like that includes one or more available media.
  • the usable medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a DVD), or a semiconductor medium (such as a solid state disk (SSD)).
  • the disclosed system, apparatus, and method may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in the embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.
  • the integrated unit if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium.
  • a computer readable storage medium A number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present application.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, which can store program codes. .

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Abstract

Les modes de réalisation de la présente invention concernent un procédé de commutation de service, un procédé de migration de contexte, et un dispositif associé, aptes à assurer une continuité de service. Le procédé décrit dans les modes de réalisation de la présente invention comprend les étapes suivantes : une unité de commande distribuée cible DU reçoit un message de demande de commutation envoyé par une unité de commande centralisée CU, le message de demande de commutation contenant au moins l'un des éléments d'informations suivants : des informations utilisées pour commander à la DU cible d'exécuter la commutation d'un service URLLC d'extrémité proche déployé, utilisées pour indiquer une politique de migration de contexte prise en charge par un serveur de service URLLC d'extrémité proche déployé, utilisées pour indiquer des exigences de latence correspondant au service URLLC, ou utilisées pour indiquer des exigences de taux de perte de paquets correspondant au service URLLC ; la DU cible envoie un message de réponse à la demande de commutation à la CU, le message de réponse à la demande de commutation étant utilisé par la CU pour commander à un UE d'initier l'accès à la DU cible ; le message de réponse à la demande de commutation contient au moins l'un des éléments d'informations suivants : l'adresse IP d'un serveur de service URLLC cible, l'adresse IP d'une passerelle de réseau local cible, une indication de support de commutation, et une politique de migration de contexte de serveur URLLC négociée.
PCT/CN2018/076448 2017-03-16 2018-02-12 Procédé de commutation de service, procédé de migration de contexte, et dispositif associé Ceased WO2018166317A1 (fr)

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