WO2020173146A1 - Procédé de traitement de commutation, dispositif associé, produit programme et support de stockage - Google Patents

Procédé de traitement de commutation, dispositif associé, produit programme et support de stockage Download PDF

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Publication number
WO2020173146A1
WO2020173146A1 PCT/CN2019/118759 CN2019118759W WO2020173146A1 WO 2020173146 A1 WO2020173146 A1 WO 2020173146A1 CN 2019118759 W CN2019118759 W CN 2019118759W WO 2020173146 A1 WO2020173146 A1 WO 2020173146A1
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WO
WIPO (PCT)
Prior art keywords
network element
plane network
user plane
address
filtering information
Prior art date
Application number
PCT/CN2019/118759
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English (en)
Chinese (zh)
Inventor
曹龙雨
于益俊
Original Assignee
华为技术有限公司
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Publication of WO2020173146A1 publication Critical patent/WO2020173146A1/fr

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Classifications

    • 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
    • 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
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/12—Reselecting a serving backbone network switching or routing node

Definitions

  • This application relates to the field of communication technologies, and in particular, to a method for switching processing, related devices, program products, and storage media.
  • the third generation partnership project (3rd generation partnership project, 3GPP) standard defines the fifth-generation mobile communication technology (5th-Generation, 5G) core network (CORE) service-oriented architecture model, as shown in Figure 1, where the core network control
  • the plane function 101 is decomposed into multiple service function modules (network function, NF), and the NFs are connected in a direct connection manner, and the interaction between the NFs adopts a service interface, and the control plane function is connected to the core network.
  • the plane network element 102 is connected to the control plane network element 102 with multiple user plane function network elements, such as the user plane function network element 103 and the user plane function network element 104 shown in FIG. 1.
  • the user plane function network element is deployed closer to the user equipment 105.
  • the user equipment 105 performs data communication with the user plane function network element 103, which is described in the course of use. If the user equipment 105 moves, the user plane function network element 103 cannot continue to serve the user equipment 105, and the user plane function network element 104 can serve the mobile user equipment 105, so that the mobile user The device 105 performs data communication with the user plane function network element 104.
  • the embodiments of the present invention provide a method, related equipment, program products, and storage media that can effectively guarantee the uninterrupted switching processing of data transmission during the movement of the user equipment.
  • the first aspect of the embodiments of the present invention provides a handover processing method, which includes:
  • the first user plane network element obtains a first mapping relationship, where the first mapping relationship includes a correspondence between packet filtering information and an identifier of a data radio bearer, the packet filtering information includes an IP quintuple, and the data radio bearer is used to carry data packets ;
  • the first user plane network element receives the address of the second user plane network element and the packet filtering information;
  • the first user plane network element sends the data packet to the address of the second user plane network element according to the packet filtering information.
  • the first user plane network element when the first user plane network element receives a downstream data packet that matches the packet filtering information, that is, the data packet includes the packet filtering information, and the first user plane network element Sending the downlink data packet to the second user plane network element identified by the address of the second user plane network element ensures the continuity of the UE service without changing the IP address of the UE.
  • the first user plane network element in order to realize that the first user plane network element sends a data packet to the second user plane network element, the first user The surface network element also needs to perform the following steps: The first user plane network element receives the data packet;
  • the first user plane network element obtains the packet filtering information included in the data packet.
  • the first user plane network element establishes the mapping relationship between the packet filtering information and the address of the second user plane network element, after the first user plane network element receives the data packet, it can parse out what the data packet includes Packet filtering information, the first user plane network element can send the data packet to the second user plane network element corresponding to the packet filtering information, ensuring that the UE’s IP address does not change and the UE’s services are continuous Sex.
  • the method further includes:
  • the first user plane network element receives instruction information from the control plane network element, where the instruction information is used to instruct the first user plane network element to send the data packet to the address of the second user plane network element according to the packet filtering information.
  • the first user plane network element can create packet filtering information and the second user plane according to the instructions of the instruction information.
  • a second aspect of the embodiments of the present invention provides a handover processing method, which includes:
  • the second user plane network element acquires a second mapping relationship, where the second mapping relationship includes a correspondence between the packet filtering information and a data radio bearer, the packet filtering information includes an IP quintuple, and the data radio bearer is used to carry data packets;
  • the second user plane network element sends the address of the second user plane network element to the control plane network element, and the address of the second user plane network element is used by the first user plane network element to send to the second user plane network element according to the packet filtering information.
  • the user plane network element sends the data packet.
  • the control plane network element may create a second mapping relationship during the process of switching the UE from the first user plane network element to the second user plane network element.
  • the user plane network element receives a data packet based on the second mapping relationship, it can use the data radio bearer to achieve the purpose of sending the data packet to the UE after the handover, and to ensure that the second user plane network element can successfully receive the data packet, Then the second user plane network element may send the address of the second user plane network element to the control plane network element, so that the control plane network element forwards the address of the second user plane network element to the first user plane network element.
  • the first user plane network element receives a downstream data packet matching the packet filtering information
  • the first user plane network element sends the downstream data packet to the network with the address of the second user plane network element Basically, it is ensured that the UE's service continuity is ensured through the first forwarding path without changing the IP address of the UE.
  • the method further includes:
  • the second user plane network element receives the data packet from the first user plane network element
  • the second user plane network element obtains the packet filtering information included in the data packet
  • the second user plane network element determines to send the data packet through the data radio bearer according to the packet filtering information and the second mapping relationship.
  • the second user plane network element receives the data packet sent by the first user plane network element, it can achieve the purpose of successfully sending the data packet to the UE based on the created second mapping relationship, It is ensured that the UE's service continuity is ensured through the first forwarding path without changing the IP address of the UE.
  • a third aspect of the embodiments of the present invention provides a handover processing method, which includes: The control plane network element sends packet filtering information and an identifier of a data radio bearer to a second user plane network element, where the packet filtering information includes an IP quintuple, and the data radio bearer is used to carry data packets;
  • the control plane network element receives the address of the second user plane network element from the second user plane network element;
  • the control plane network element sends the address of the second user plane network element and the packet filtering information to the first user plane network element, and the address of the second user plane network element is used for the first user plane network element to filter according to the packet
  • the information sends the data packet to the address of the second user plane network element.
  • the first user plane network element can create a mapping between packet filtering information and the address of the second user plane network element during the process of the control plane network element switching the UE from the source cell to the target cell Relationship, in the case that the first user plane network element receives a downlink data packet matching the packet filtering information, the first user plane network element sends the downlink data packet through the first forwarding path to the first forwarding path.
  • the network element of the address of the second user plane network element it is ensured that the UE's service continuity is ensured through the first forwarding path without changing the IP address of the UE.
  • control plane network element sends instruction information to the first user plane network element, and the instruction information is used to indicate the The first user plane network element sends the data packet to the address of the second user plane network element according to the packet filtering information.
  • the control plane network element determines that the UE is handed over to the target cell, then the control plane network element determines that the first mapping relationship stored in the first user plane network element needs to be changed, and the control plane network element may forward According to the instruction information sent by the user plane network element, the first user plane network element can create a mapping relationship between packet filtering information and the address of the second user plane network element, so that the first user plane network element The data packet can be sent to the address of the second user plane network element according to the packet filtering information, which ensures the continuity of the UE service.
  • the fourth aspect of the embodiments of the present invention provides a user plane network element.
  • the user plane network element is the first user plane network element shown in this application.
  • the user plane network element specifically includes:
  • An obtaining unit configured to obtain a first mapping relationship, where the first mapping relationship includes a correspondence between packet filtering information and an identifier of a data radio bearer, the packet filtering information includes an IP quintuple, and the data radio bearer is used to carry data packets;
  • a receiving unit configured to receive the address of the second user plane network element and the packet filtering information;
  • the processing unit is configured to send the data packet to the address of the second user plane network element according to the packet filtering information.
  • the user plane network element shown in this aspect is used to execute the handover processing method shown in the above first aspect.
  • the receiving unit is further configured to receive the data packet; and the acquiring unit is further configured to acquire the data packet including The packet filtering information.
  • the receiving unit is further configured to receive indication information from a control plane network element, where the indication information is used to indicate the second A user plane network element sends the data packet to the address of the second user plane network element according to the packet filtering information.
  • a fifth aspect of the embodiments of the present invention provides a user plane network element.
  • the user plane network element is the second user plane network element shown in this application.
  • the user plane network element specifically includes:
  • An obtaining unit configured to obtain a second mapping relationship, where the second mapping relationship includes a correspondence between the packet filtering information and a data wireless bearer, the packet filtering information includes an IP quintuple, and the data wireless bearer is used to carry data packets;
  • a sending unit configured to send the address of the second user plane network element to the control plane network element, the second user plane network element The address of is used by the first user plane network element to send the data packet to the second user plane network element according to the packet filtering information.
  • the user plane network element shown in this aspect is used to execute the handover processing method shown in the above second aspect.
  • the user plane network element further includes: a receiving unit, configured to receive the data from the first user plane network element
  • the acquiring unit is further configured to acquire the packet filtering information included in the data packet; and the determining unit is configured to determine to send the data packet through the data radio bearer according to the packet filtering information and the second mapping relationship.
  • a sixth aspect of the embodiments of the present invention provides a control plane network element, including:
  • a sending unit configured to send packet filtering information and an identifier of a data radio bearer to a second user plane network element, where the packet filtering information includes an IP quintuple, and the data radio bearer is used to carry data packets;
  • a receiving unit configured to receive the address of the second user plane network element from the second user plane network element
  • the sending unit is further configured to send the address of the second user plane network element and the packet filtering information to the first user plane network element, and the address of the second user plane network element is used for the first user plane network element.
  • the network element sends the data packet to the address of the second user plane network element according to the packet filtering information.
  • control plane network element shown in the aspect is used to execute the handover processing method shown in the third aspect.
  • handover processing method For the specific execution process and beneficial effects of the handover processing method, please refer to the above third aspect for details.
  • the sending unit is further configured to send instruction information to the first user plane network element, where the instruction information is used for Instruct the first user plane network element to send the data packet to the address of the second user plane network element according to the packet filtering information.
  • the seventh aspect of the application of the present invention provides a data switching device, which has the function of realizing the behavior of each network element in the above method design.
  • Functions can be realized by hardware, or by hardware executing corresponding software.
  • the hardware or software includes one or more modules corresponding to the above-mentioned functions.
  • the modules can be software and/or hardware.
  • the structure of the device includes a processor and a memory, where a computer-readable program is stored in the memory; the processor is used to implement the method shown in any of the above aspects by running the program in the memory .
  • the eighth aspect of the present application provides a computer program product, when the computer program product is executed, it is used to execute the method shown in any of the foregoing aspects.
  • the ninth aspect of the application of the present invention provides a computer-readable storage medium, where instructions are stored in the computer-readable storage medium, and the instructions are used to execute the method shown in any of the foregoing aspects.
  • Figure 1 is a schematic diagram of a structure of a communication system provided by the prior art
  • Figure 2 is a schematic diagram of another structure of a communication system provided by the prior art
  • Fig. 3 is an example diagram of the control plane protocol stack of the N2 interface provided by the prior art
  • Fig. 4 is an example diagram of the user plane protocol stack of the N3 interface provided by the prior art
  • Figure 5 is a schematic structural diagram of an embodiment of a communication system provided by an embodiment of the present invention.
  • FIG. 6 is a schematic structural diagram of an embodiment of a protocol stack of a user plane network element provided by an embodiment of the present invention
  • FIG. 7 is a schematic structural diagram of another embodiment of a communication system provided by an embodiment of the present invention.
  • FIG. 8 is a flowchart of steps in an embodiment of a handover processing method provided by an embodiment of the present invention.
  • FIG. 9 is a schematic structural diagram of another embodiment of a communication system provided by an embodiment of the present invention.
  • FIG. 10 is a flowchart of steps of an embodiment of a handover processing method provided by an embodiment of the present invention.
  • FIG. 11 is a flowchart of steps in another embodiment of a handover processing method provided by an embodiment of the present invention
  • FIG. 12 is a schematic structural diagram of another embodiment of a communication system provided by an embodiment of the present invention
  • FIG. 13 is a flowchart of another embodiment of a handover processing method provided by an embodiment of the present invention
  • FIG. 14 is a schematic structural diagram of another embodiment of a communication system provided by an embodiment of the present invention
  • FIG. 15 is a step flowchart of another embodiment of a handover processing method provided by an embodiment of the present invention
  • FIG. 16 is a step flowchart of another embodiment of a handover processing method provided by an embodiment of the present invention
  • FIG. 17 Is a schematic structural diagram of another embodiment of a communication system provided by an embodiment of the present invention
  • FIG. 18 is a flowchart of steps in another embodiment of a handover processing method provided by an embodiment of the present invention
  • FIG. 19 is a schematic structural diagram of another embodiment of a communication system provided by an embodiment of the present invention.
  • FIG. 20 is a flowchart of another embodiment of a handover processing method provided by an embodiment of the present invention
  • FIG. 21 is a schematic structural diagram of another embodiment of a communication system provided by an embodiment of the present invention.
  • FIG. 22 is a step flowchart of another embodiment of a handover processing method provided by an embodiment of the present invention
  • FIG. 23 is a step flowchart of another embodiment of a handover processing method provided by an embodiment of the present invention
  • FIG. 24 It is a schematic structural diagram of an embodiment of a user plane network element provided by an embodiment of the present invention
  • 25 is a schematic structural diagram of another embodiment of a user plane network element provided by an embodiment of the present invention.
  • FIG. 26 is a schematic structural diagram of an embodiment of a control plane network element provided by an embodiment of the present invention.
  • FIG. 27 is a schematic structural diagram of an embodiment of a data switching device provided by an embodiment of the present invention.
  • plural means two or more.
  • And/or describes the association relationship of the associated objects, which means that there can be three kinds of relationships.
  • a and/or B can mean: A alone exists, A and B exist at the same time, and B exists alone.
  • the character "/” generally indicates that the associated objects are in an "or” relationship.
  • This application provides a method that can effectively ensure the uninterrupted handover processing of data transmission during the movement of the user equipment. To better understand the method shown in this embodiment, the following first describes the communication in the prior art. The structure of the system is explained in detail:
  • the control plane function and the forwarding plane function of the mobile gateway are uncultivated, and the separated control plane function is consistent with the third generation partnership project.
  • 3GPP The traditional control network element mobility management entity (mobility management entity, MME) is merged into a unified control plane (control plane).
  • UPF User plane function
  • SGW-U and PGW-U user plane functions
  • SGW serving gateway
  • PGW packet data network gateway
  • the unified control plane network elements can be decomposed into access and mobility management function (access and mobility management function, AMF) network elements and meeting i tongue management function (session management function, SMF) network element.
  • AMF access and mobility management function
  • SMF session management function
  • the core network control plane function 201 shown in FIG. 2 also includes functional modules such as authentication server function (AUSF), and may also include application function (AF) and unified data management (unified data management). management, UDM), policy control function (PCF), NF storage function (NF Repository Function, NRF), and network exposure function (NEF).
  • AUSF authentication server function
  • AF application function
  • unified data management unified data management
  • management UDM
  • policy control function PCF
  • NF storage function NF Repository Function
  • NRF network exposure function
  • the terminal equipment involved in the system is not limited to the 5G network, and includes: mobile phones, Internet of Things equipment, smart home equipment, industrial control equipment, vehicle equipment, and so on.
  • the terminal equipment may also be referred to as user equipment (UE), mobile station (Mobile Station), mobile station (Mobile), remote station (Remote Station), remote terminal (Remote Terminal), and access terminal (Access Terminal). ), User Terminal, and User Agent, which are not limited here.
  • the above-mentioned terminal equipment may also be a car in vehicle-to-vehicle (V2V) communication, a machine in machine-type communication, and the like.
  • V2V vehicle-to-vehicle
  • the RAN202 is a device for providing wireless communication functions for UEs.
  • the RAN 202 may include various forms of base stations, for example: macro base stations, micro base stations (also referred to as small stations), relay stations, and access points.
  • base stations for example: macro base stations, micro base stations (also referred to as small stations), relay stations, and access points.
  • the names of devices with base station functions may be different.
  • eNB evolved NodeB
  • Node B Node B
  • gNB gNodeB
  • the AMF network elements involved in the system may be responsible for terminal device registration, mobility management, and tracking area update procedures.
  • AMF network elements may also be called AMF devices or AMF entities.
  • the UDM network elements involved in the system can store user subscription data.
  • the user's subscription data includes subscription data related to mobility management and subscription data related to session management.
  • the UDM network element may also be referred to as UDM equipment or UDM entity.
  • the SMF network element involved in the system may be responsible for session management of the terminal device.
  • session management includes selection of user plane devices, reselection of user plane devices, IP address allocation, quality of service (QoS) control, and session establishment, modification, or release.
  • QoS quality of service
  • the above 5G communication system further includes a network function storage function (Network Function Repository Function, NRF) network element.
  • NRF Network Function Repository Function
  • This network element can provide service discovery functions.
  • the NRF network element can also maintain information about effective network function network elements in the core network.
  • NRF network elements can also maintain effective network functions in the core network and services supported by the network elements.
  • the UPF network element may implement functions such as forwarding, statistics, and detection of user messages.
  • UPF network elements may also be referred to as UPF devices or UPF entities.
  • the PCF network element includes the functions of policy control and flow-based charging control.
  • PCF network elements can implement user subscription data management functions, policy control functions, charging policy control functions, and QoS control.
  • PCF network elements may also be referred to as PCF entities or PCF devices.
  • the interaction between NFs uses service-based interfaces.
  • the interface Nnef is a service-based interface provided by NEF
  • the interface Nnrf is a service-based interface provided by NRF.
  • the interface Npcf It is a service-based interface provided by PCF.
  • the interface Nudm is a service-based interface provided by UDM.
  • the interface Naf It is the current service-based interface provided by AF
  • the interface Namf is the current service-based interface provided by AMF
  • the interface Nsmf is the service-based interface provided by SMF.
  • the core network control plane function 201 is connected to a radio access network (RAN) 202, the interface between the core network control plane function 201 and the RAN 202 is an N2 interface, and the N2 interface is one of RAN 202 and AMF The N2 interface does not support servicing.
  • RAN radio access network
  • the RAN202 side is sequentially processed by the PDCP-C layer of the packet data convergence protocol (PDCP) control plane layer and the radio resource control (radio resource control, RRC) layer.
  • the signaling is forwarded to the NGAP (NG Application Protoclo) layer.
  • the NGAP layer forwards the processed signaling to the stream control transmission protocol (SCTP) layer for processing.
  • SCTP stream control transmission protocol
  • the SCTP layer is processed, it is sent to the N2 interface through the N2 interface.
  • the AMF is sequentially processed by the SCTP layer and the NGAP layer on the AMF side.
  • the RAN202 side is processed by the PDCP user plane layer PDCP-U layer and the service data adaptation protocol (service data adaptation protocol, SDAP) layer in turn, and then forwards the processed signaling to the General Packet Radio Service Tunneling Protocol
  • the user plane (general packet radio service tunneling protocol for user plane, GTPU) layer is processed.
  • the GTPU layer passes through the Internet protocol (IP) layer and the media access control layer (media access control, MAC).
  • IP Internet protocol
  • MAC media access control layer
  • L2 layer and physical layer (L1) are processed and then forwarded to UPF203 through the N3 interface, which is processed by the GTPU layer, user datagram protocol (UDP) layer, IP layer, L2 layer and LI layer on the UPF203 side .
  • both the SDAP layer and the PDCP-U layer on the RAN side need to support GTPU/UDP protocol processing, and perform data forwarding with UPF203 through the N3 interface, then the N3 interface
  • the GTPU protocol processing caused by the data transmission delay is relatively large, and the processing efficiency is low.
  • the structure of the communication system provided by the present application will be exemplarily described below in conjunction with the embodiment shown in FIG. 5.
  • the communication system shown in this embodiment can avoid GTPU/UDP protocol processing, thereby reducing the delay of data forwarding and improving Improved processing efficiency.
  • the communication system shown in this embodiment includes a core network control plane function 501.
  • a core network control plane function 501 For a specific description of the core network control plane function 501, please refer to FIG. 2 for details, which is not specifically described in this embodiment. limited.
  • the core network control plane function 501 shown in this embodiment is connected to a radio network management function (RNMF) 502 through an R2 interface, and the RNMF 502 is connected to a user plane network element 503 through an E1 interface, and The RNMF 502 is connected to a distributed unit (DU) 505 through an F1-C interface, and the DU 505 is connected to a user equipment (UE) 506, and the user plane network element 503 may also be connected to a distributed unit (DU) 505 through an N6 interface.
  • a data network element (datan Network, DN) 504 is connected.
  • the communication system shown in this embodiment can realize the integration of the control plane and the user plane;
  • the integration of the control plane because the RNMF 502 shown in this embodiment and the NFs included in the core network control plane function 501 call each other in a service-oriented manner, and the RNMF 502 and the radio access network control When the plane function network element 504 is connected, the integration of the RAN and the core network control plane function can be realized.
  • the user plane network element 503 shown in this embodiment is that the user plane N3 interface and its GTPU/GTPU/ are removed from the RAN side and the UPF side shown in the prior art.
  • the protocol stack of the user plane network element 503 can be seen in FIG. 6;
  • the user plane network element 503 includes an SDAP layer, a PDCP-U layer, an IP layer, an L2 layer, and an L1 layer. As shown in FIG. 5 and FIG. 6, it can be seen that the user plane network element When 503 receives the downlink data packet sent by the DN 507, the downlink data packet can be sent to the SDAP layer and PDCP-U layer of the RAN user plane in one jump.
  • the communication system shown in this embodiment is adopted Since the user plane network element 503 included in the communication system has deleted the user plane N3 interface and its GTPU/UDP protocol processing, the user plane network element 503 does not need to perform GTPU protocol processing, so that the downlink data packet can be The jump is sent to the SDAP layer and the PDCP-U layer, which reduces the delay of data forwarding, and realizes the functional integration and service-oriented unified communication between the user plane network element 503 and the core network control plane function 501.
  • the user plane network element shown in this embodiment will be closer to the user equipment in deployment, so during the movement of the user equipment, the probability that the user plane network element serving the user equipment will change will increase. Frequent movement of the user equipment will result in frequent switching of user plane network elements, which in turn will cause the user equipment’s services to be interrupted due to the untimely switching of user plane network elements during the frequent movement of the user equipment, which reduces data transmission costs. Efficiency. For this reason, the present application provides a handover processing method, which can effectively ensure that when the user equipment moves to cause the user plane network element to switch, the service continuity of the user equipment can be guaranteed.
  • control plane network element 702 is taken as an example for illustration.
  • the control plane network element may be the RNMF shown in FIG. 5 or PDCP-C, which is not specifically limited in this embodiment;
  • the UE 705 can interact with the control plane network element 702 through the first DU704, and after the handover, the UE 705 can interact with the control plane network element 702 through the second DU708; and
  • the DN that the UE 705 needs to access before the handover is the first DN 706, that is, the first DN 706 can send downlink data packets to the UE 705 through the first user plane network element 703.
  • the second DN 716 sends the downlink data packet to the UE 705 through the second user plane network element 707.
  • one user plane network element is connected to one DN as an example for illustrative description. In other examples, one user plane network element may be connected to multiple DNs, and the specific description is not limited in this embodiment.
  • Step 801 The first user plane network element obtains a first mapping relationship.
  • the first mapping relationship includes a correspondence relationship between packet filtering information and an identifier of a data radio bearer.
  • the packet filtering information includes IP quintuples.
  • a data radio bearer DRB is used to carry data packets.
  • the first user plane network element stores a first mapping relationship.
  • the first user plane network element may be based on the first mapping relationship Determine the data radio bearer, and pass The data radio bearer sends data packets to the UE.
  • the first user plane network element shown in this embodiment is the first user plane network element 703 shown in FIG. 7, and the UE is the UE 705 shown in FIG. 7.
  • Step 802 The first user plane network element receives the address and packet filtering information of the second user plane network element.
  • control plane network element determines that the user plane network element serving the UE is switched from the first user plane network element to the second user plane network element, and the control plane network element obtains the address and packet filtering information of the second user plane network element.
  • the control plane network element sends the address and packet filtering information of the second user plane network element to the first user plane network element.
  • the second user plane network element shown in this embodiment is the second user plane network element 707 shown in FIG. 7, and the control plane network element is the control plane network element 702 shown in FIG. 7.
  • Step 803 The first user plane network element sends a data packet to the address of the second user plane network element according to the packet filtering information. For example, in a case where the first user plane network element receives the address of the second user plane network element and the packet filtering information, the first user plane network element creates a correspondence between the packet filtering information and the address of the second user plane network element. In the case that the first user plane network element receives a data packet including packet filtering information, the first user plane network element can determine the second user plane network element corresponding to the packet filtering information according to the stored correspondence relationship. Address, the first user plane network element can send a data packet to the address of the second user plane network element, so that the user plane network element identified by the address of the second user plane network element can receive the address of the first user plane network element Packets sent.
  • the first user plane network element when the control plane network element switches the UE to the second user plane network element, the first user plane network element can create a mapping between packet filtering information and the address of the second user plane network element Relationship, when the first user plane network element receives a data packet matching the packet filtering information, the first user plane network element uses the data packet and the address of the second user plane network element corresponding to the packet filtering information to The data packet is sent to the user plane network element with the address of the second user plane network element, ensuring that the IP address of the UE is not changed, and forwarding between the first user plane network element and the second user plane network element is realized The creation of the path ensures the continuity of the UE service.
  • the specific process of the method shown in this application executed by different communication system structures is exemplified as follows:
  • control plane network elements used to perform handover may be different network elements.
  • the control plane network element of the handover is the first radio network management function RNMF as an example for exemplification.
  • the method shown in this embodiment specifically includes:
  • Step 1001 The UE sends a measurement report to the first RNMF.
  • the measurement report shown in this embodiment is a measurement report generated after the UE measures the source cell where the UE resides, and specifically includes the measurement identifier ID, the measurement result of the source cell, and the measurement result of the neighboring cell. This embodiment does not limit the specific content included in the measurement report.
  • the UE 901 reports the measurement report to the first RNMF 905 through the first DU902, the first PDCP-C903, and the first RRC904 in turn, where the first PDCP- Both C903 and the first RRC904 are connected to the first RNMF905.
  • the core network control plane function includes: AMF, SMF, and UDM are taken as examples for description.
  • the core network control plane function includes The number and type of NF are not limited.
  • Step 1002 The first RNMF sends a handover instruction to the first RRC.
  • the first RNMF determines the target cell according to the received measurement report, the target cell is the cell to be handed over by the UE, and the first RNMF determines the target cell according to the target ID. Whether the target cell is within the service range of the first RNMF, optionally, the first RNMF may be preset with a service list, and the service list includes the identity of the cell that can be served by the first RNMF, then In this step, if the first RNMF determines that the identity of the target cell is in the service list, the first RNMF determines that the target cell is within the service range of the first RNMF, if If the identity of the target cell is not in the service list, the first RNMF determines that the target cell is not in the service range of the first RNMF.
  • This embodiment takes the target cell within the service range of the first RNMF as an example for exemplification. If the target cell is located within the service range of the first RNMF, it is used to serve the UE The first RNMF, AMF, SMF, etc. do not need to be changed.
  • the first RNMF determines the first RRC, and the first RRC is the RRC currently used to serve the UE, then the first RNMF sends handover indication information to the first RRC Wherein, the handover indication shown in this embodiment is used to instruct the first RRC to initiate an HO request.
  • Step 1003 The first RRC sends a handover request to the first RNMF.
  • the first RRC sends a handover request HO request to the first RNMF according to the handover indication, where the HO request carries the target ID, the identification of the user equipment (UE id), the globally unique AMF ID (GUAMI), the user equipment context (UE context) and other information.
  • the HO request carries the target ID, the identification of the user equipment (UE id), the globally unique AMF ID (GUAMI), the user equipment context (UE context) and other information.
  • Step 1004 The first RNMF sends a handover request to the second RRC.
  • the first RNMF determines a second RRC according to the received target ID, where the second RRC is an RRC capable of serving the target cell, that is, the second RRC determined by the first RNMF It can serve the UE camping on the target cell after the handover.
  • the first RRC 904 and the second RRC 906 all belong to the service range of the first RNMF 905.
  • the first RNMF determines the second RRC
  • the first RNMF sends a handover request to the second RRC
  • the handover request sent by the first RNMF to the second RRC Carry a second data network name (data network name, DNN), second indication information (selection indication), a quality of service profile (QoS profile), and a packet filter (Packet filter) corresponding to the QoS profile information.
  • a second data network name data network name, DNN
  • second indication information selection indication
  • QoS profile quality of service profile
  • Packet filter Packet filter
  • the second DNN is used to identify the name of the second DN that the UE needs to access after the handover.
  • the DN911 can send downlink data packets to the UE901 through the first user plane network element 908.
  • the DN that the UE901 needs to access is switched to the second DN912, that is, for the UE901 after the handover, the The second DN 912 sends the downlink data packet to the UE 901 through the second user plane network element 909.
  • one user plane network element is connected to one DN as an example for illustrative description. In other examples, one user plane network element may be connected to multiple DNs, and the specific description is not limited in this embodiment.
  • the second indication information is an operation indication sent by the first RNMF to the second PDCP-C, and the second indication information
  • the information is used to instruct the second PDCP-C to determine the second user plane network element.
  • the second user plane network element determined by the second PDCP-C is used to serve the UE after the handover. This embodiment does not limit the value of the second indication information, as long as the second indication information is received
  • the second PDCP-C of the indication information can perform related operations for determining the second user plane network element.
  • the value of the second indication information shown in this embodiment may be Convergence UP type.
  • the quality of service profile is the QoS parameter information sent by the SMF to the first RNMF.
  • the quality of service profile may include at least one of the following: Al location and Retention Priority , ARP), guaranteed flow bit rate (Guaranteed Flow Bit Rate, GFBR), maximum flow bit rate (Maximum Flow Bit Rate, MFBR), maximum packet loss rate (Maximum Packet Loss Rate, MPLR), etc.
  • ARP Al location and Retention Priority
  • ARP guaranteed flow bit rate
  • GFBR Guarantee Flow Bit Rate
  • MFBR maximum flow bit rate
  • Maximum Packet Loss Rate MPLR
  • the first RNMF also receives the packet filtering information corresponding to the quality of service profile from the SMF. After the first RNMF receives the service quality configuration file and the corresponding packet filtering information sent by the SMF, the first RNMF can set the service quality configuration file and the corresponding packet filtering information in the handover Requesting.
  • the SMF obtains the packet filtering information from the first user plane network element, and forwards the packet filtering information to the first RNMF, where the packet filtering information includes an IP quintuple, specifically including a source IP address , Source port, destination IP address, destination port and transport layer protocol. And a first mapping relationship between the packet filtering information and the data radio bearer has been created on the first user plane network element.
  • the first user plane network element 908 receives the downlink data packet from the first ND911 through the N6 interface.
  • the first user plane network element 908 can be based on the IP quintuple information in the downlink data packet and the stored data of the first user plane network element 908 The packet filtering information is matched. If the IP quintuple in the downlink data packet is consistent with the packet filtering information, the first user plane network element 908 can determine and For the DRB corresponding to the packet filtering information, the first user plane network element can forward the downlink data packet to the UE through the DRB corresponding to the packet filtering information.
  • Step 1005 The second RRC sends a PDU session resource establishment message to the second PDCP-C.
  • the second RRC can establish an RRC context for the UE according to the handover request, and the second RRC is the UE's data connection (PDU Session) Allocate a data radio bearer (data radio bearer, DRB) identification (ID), where the PDU Session is used to establish a service for exchanging PDU data packets between the UE and the second DU, that is, to establish the UE and the second DU. Data transmission channel between two DUs.
  • PDU Session Allocate a data radio bearer (data radio bearer, DRB) identification (ID)
  • the second RRC selects a second PDCP-C that can serve the handover UE based on the target ID, and sends a PDU session resource setup (PDU session resource setup) message to the determined second-PDCP-C
  • PDU session resource setup message carries parameter information such as the DRB ID, the second DNN, the selection indication, the QoS profile and the corresponding packet filtering information, and the information about each parameter is
  • parameter information such as the DRB ID, the second DNN, the selection indication, the QoS profile and the corresponding packet filtering information
  • Step 1006 The second PDCP-C sends a context establishment request message to the second user plane network element.
  • the second PDCP-C receives the session resource establishment message sent by the second RRC, the second PDCP-C activates the security context, and proceeds according to the selection indication in the message
  • the second PDCP-C is used in this embodiment according to the selection indication
  • the selected user-plane network element is the second user-plane network element as an example for exemplification.
  • the specific description of the second user-plane network element please refer to the above description for details, and details are not repeated.
  • the second PDCP-C may also refer to the second DNN to select the second user plane network element, so that the second user plane network element selected by the second PDCP-C can serve
  • the second PDCP-C may also refer to the location information of the UE to select the second user plane network element, where the location information of the UE may be a target cell to be handed over by the UE, Therefore, the second user plane network element can serve the UE camping in the target cell.
  • the second PDCP-C may also refer to a radio access type (RAT). ) Select the second user plane network element so that the second user plane network element selected by the second PDCP-C can support the RAT.
  • RAT radio access type
  • the second PDCP-C selects the second user plane network element
  • the second PDCP-C sends the context establishment request message to the second user plane network element, and the context establishment
  • the request message carries the DRB id, the QoS profile and the corresponding packet filtering information.
  • Step 1007 The second user plane network element sends a context establishment response message to the second PDCP-C.
  • the second user plane network element receives the context establishment request message
  • the second user plane network element activates the user plane security context and related configuration, such as security-related configuration, and signaling addition
  • the configuration related to decryption is not specifically limited in this embodiment.
  • the second user plane network element creates a second mapping relationship according to the DRB id and the packet filtering information carried in the context establishment request message, and the second mapping relationship includes the packet filtering information and the DRB id The mapping relationship of the identified data radio bearer.
  • the context setup response (context setup response) message sent by the second user plane network element carries the DRB id and the address of the second user plane network element, for example, the second user shown in this embodiment
  • the address of the second user plane network element is the address of the second user plane network element.
  • the address of the second user plane network element may be the IP address of the second user plane network element and/or the second user plane network element.
  • the media access control (MAC) address of the user plane network element MAC address of the user plane network element.
  • the address of the second user plane network element is used to establish a first forwarding path for data forwarding between the first user plane network element and the second user plane network element during the UE handover, so that The first user plane network element can forward the data packet to the second user plane network element through the first forwarding path, effectively avoiding the situation of the UE's service terminal caused by the untimely switching of the user plane network element.
  • Step 1008 The second PDCP-C sends a signaling message to the second DU.
  • the signaling message shown in this embodiment instructs the second DU to create a PDU session with the UE, and the second DU can establish a connection between the UE and the second DN according to the signaling message.
  • Data transmission channel instructs the second DU to create a PDU session with the UE, and the second DU can establish a connection between the UE and the second DN according to the signaling message.
  • Step 1009 The second PDCP-C sends a PDU session resource establishment response to the second RRC.
  • the second PDCP-C may send a PDU session resource setup response (PDU session resource setup response) to the second RRC .
  • PDU session resource setup response is used to indicate the completion of the PDU Session configuration, and the PDU session resource setup response may also carry the PDU session ID and the address of the second user plane network element.
  • Step 1010 The second RRC sends a handover request confirmation message to the first RNMF.
  • the second RRC After the second RRC receives the PDU session resource setup response, the second RRC Send a handover request confirmation message (HO Request Ack) message to the first RNMF, where the HO Request Ack message carries the PDU session ID and the address of the second user plane network element.
  • HO Request Ack handover request confirmation message
  • Step 1011 The first RNMF sends a handover request confirmation message to the first RRC.
  • the first RNMF may send the HO Request Ack message to the first RRC, where the HO Request Ack message carries first indication information (operation indication), the information of the second user plane network element The address and the parameters such as the packet filtering information, where the first indication information is used to instruct the first user plane network element to create a mapping relationship between the address of the second user plane network element and the packet filtering information.
  • first indication information operation indication
  • the packet filtering information the packet filtering information
  • Step 1012 The first RRC sends a handover command to the first PDCP-C.
  • the first RCC may send the handover command (HO command) to the first PDCP-C, where the HO
  • the command carries the first indication information, the address of the second user plane network element, and the packet filtering information.
  • Step 1013 The first PDCP-C sends a context modification request message to the first user plane network element.
  • the context modification request (Context modification request) message carries the first indication information, the address of the second user plane network element, and the packet filtering information.
  • the address of the network element and the packet filtering information please refer to the above description for details, and details are not repeated.
  • Step 1014 The first user plane network element receives the context modification request message.
  • the first user plane network element may modify the first mapping relationship stored in the first user plane network element according to the first indication information included in the context modification request message, for example, Before the UE handover, the first user plane network element has created a first mapping relationship between the packet filtering information and the DRB, and in the case that the first user plane network element receives the first indication information, The first user plane network element modifies the mapping relationship between the packet filtering information and the DRB to the mapping relationship between the packet filtering information and the address of the second user plane network element, and the mapping relationship between the packet filtering information and the address of the second user plane network element is changed in the first user plane network element.
  • the mapping relationship between the packet filtering information and the DRB is modified to the mapping relationship between the packet filtering information and the address of the second user plane network element
  • the first user plane network element receives a downlink data packet
  • the The first user plane network element determines that the IP quintuple information in the downstream data packet is the same as the packet filtering information, then the first user plane network element can determine the second user corresponding to the packet filtering information
  • the address of the network element the first user plane network element forwards the downlink data packet to the address of the second user plane network element.
  • Step 1015 The first user plane network element sends a context modification response message to the first PDCP-C.
  • the context modification response message is used to indicate that the first user plane network element has successfully created the first mapping relationship.
  • Step 1016 The first PDCP-C sends a handover command to the UE.
  • the HO command is used to instruct the UE to perform RRC reconfiguration to synchronize the UE to the target cell.
  • the first PDCP-C903 sends the first DU902 to the first DU902.
  • the first DU902 can forward the handover command to the UE 901, and the UE 901 can perform RRC reconfiguration, so that the UE 901 is connected to the target cell and connected to the UE 901.
  • the UE 901 of the target cell may send uplink data to the second user plane network element 909 through the second DU910.
  • Step 1017 The UE sends a handover completion confirmation message to the first RNMF.
  • the UE when the UE determines that the UE is connected to the target cell, the UE may The confirmation message is sent to the first RNMF through the second DU, the second PDCP-C, and the second RRC in sequence.
  • the handover completion confirmation message is used to indicate to the first RNMF that the UE has been handed over to the target cell.
  • the first RNMF After the first RNMF receives the handover completion confirmation message, the first RNMF updates the context information of AMF and SMF, thereby indicating on the core network control plane function side that the UE has been handed over to the target cell.
  • the first user plane network element when the first RNMF is in the process of handing over the UE to the target cell, the first user plane network element can create packet filtering information and the address of the second user plane network element Mapping relationship, when the first user plane network element receives a downlink data packet matching the packet filtering information, the first user plane network element sends the downlink data packet to the second user
  • the second user plane network element of the address of the plane network element ensures that the forwarding path between the first user plane network element and the second user plane network element is realized without changing the IP address of the UE. Created to ensure the continuity of the UE service through the first forwarding path. Based on the fact that the UE shown in FIG. 10 has been handed over to the target cell, the following describes how to implement uplink data packet and downlink data packet transmission after the UE switches to the target cell as shown in Fig. 11;
  • Step 1101 The first user plane network element receives a downlink data packet.
  • the first user plane network element 908 receives the downlink data packet from the first DN through the N6 interface.
  • Step 1102 The first user plane network element determines the first forwarding path.
  • the first user plane network element has stored the first mapping relationship between packet filtering information and the address of the second user plane network element, and the first user plane network element has received all
  • the first user plane network element may obtain the IP quintuple information in the downlink data packet, and obtain the same packet filtering information as the IP quintuple information in the downlink data packet
  • the first user plane network element may determine the address of the second user plane network element corresponding to the packet filtering information according to the stored first mapping relationship.
  • the first forwarding path is The path through which the data packet is transmitted by the address of the second user plane network element.
  • Step 1103 The first user plane network element sends the downlink data packet to the second user plane network element.
  • the first user plane network element may send the downlink data packet to the second user plane network element having the address of the second user plane network element.
  • Step 1104 The second user plane network element sends the downlink data packet to the UE.
  • the second user plane network element has created a second mapping relationship between packet filtering information and the target DRB, and in the case that the second user plane network element receives a downlink data packet, the first The second user plane network element may obtain the IP quintuple included in the downlink data packet, and obtain the packet filtering information corresponding to the IP quintuple information in the downlink data packet, and the second user plane network element may Acquire the target DRB corresponding to the packet filtering information, and the second user plane network element may send the data packet to the UE through the target DRB.
  • the above steps illustrate how the downlink data packet is sent to the UE that has been handed over to the target cell, and the following steps illustrate how the uplink data packet is sent to the second DN.
  • Step 1105 The UE sends the uplink data packet to the second DU.
  • the UE 901 when the UE is connected to the target cell, as shown in FIG. 9 as an example, when the UE 901 has an uplink data packet to be sent, the UE 901 may send the uplink data packet to The second DU910.
  • Step 1106 The second DU sends the uplink data packet to the second user plane network element.
  • Step 1107 The second user plane network element sends the uplink data packet to the second DN.
  • the second user plane network element 909 when the second user plane network element 909 receives the uplink data packet sent by the UE 901, the second user plane network element 909 can pass The N6 interface sends the uplink data packet to the second DN 912 to implement the transmission of the uplink data packet.
  • the first user plane network element uses the created packet filtering information and the address of the second user plane network element According to the first mapping relationship, the downlink data packet can be directly forwarded to the second user plane network element through the first forwarding path, which effectively ensures the continuity of the UE service and improves the efficiency of data transmission.
  • the control plane network element performing the handover is the second Take a functional network element of the control plane of the radio access network as an example for illustrative description;
  • the communication system shown in FIG. 12 does not include RNMF.
  • the first RRC and the second RRC shown in FIG. 12 are both functionally connected to the core network control plane.
  • the first RRC and the second RRC are connected to each other.
  • the method shown in this embodiment specifically includes :
  • Step 1301 the UE reports to the first RRC measurement.
  • the UE 1201 sequentially reports the measurement report through the first DU1202 and the first PDCP-C1203 Report to the first RRC1204.
  • Step 1302 The first RRC sends a handover request to the second RRC.
  • the first RRC may determine a target cell according to the received measurement report, where the target cell is the cell to be handed over by the UE and determines the target ID of the target cell.
  • the first RRC obtains the identity (UE id) of the UE requesting the handover and GUAMI information.
  • the first RRC determines a second RRC according to the determined target ID
  • the second RRC is an RRC that can serve the target cell, that is, the second RRC determined by the first RRC can To serve the UE camped on the target cell after the handover, as shown in FIG. 12, the second RRC 1206 is an RRC determined by the first RRC 1204 that can serve the UE 1201 after the handover.
  • the first RRC determines the second RRC
  • the first RRC sends a handover request to the second RRC, and the handover request sent by the first RRC to the second RRC It carries a second data network name (data network name, DNN), second indication information (selection indication), a quality of service profile (QoS profile), and packet filter (Packet filter) information corresponding to the QoS profile.
  • a second data network name data network name, DNN
  • second indication information selection indication
  • QoS profile quality of service profile
  • Packet filter Packet filter
  • Step 1303 The second RRC sends a PDU session resource establishment message to the second PDCP-C.
  • Step 1304 The second PDCP-C sends a context establishment request message to the second user plane network element.
  • Step 1305 The second user plane network element sends a context establishment response message to the second PDCP-C.
  • Step 1306 The second PDCP-C sends a signaling message to the second DU.
  • Step 1307 The second PDCP-C sends a PDU session resource establishment response to the second RRC.
  • step 1303 to step 1307 shown in this embodiment please refer to step 1005 to step 1009 shown in FIG. 10, which will not be repeated in this embodiment.
  • Step 1308 The second RRC sends a handover request confirmation message to the first RRC.
  • the second RRC After the second RRC receives the PDU session resource setup response, the second RRC sends a HO Request Ack message to the first RRC, where the HO Request Ack message carries the PDU session ID and the address of the second user plane network element.
  • the HO Request Ack message carries parameters such as first indication information (operation indication), the address of the second user plane network element, and the packet filtering information, where the first indication information is used to indicate
  • the first user plane network element creates a mapping relationship between the address of the second user plane network element and the packet filtering information.
  • Step 1309 The first RRC sends a handover command to the first PDCP-C.
  • Step 1310 The first PDCP-C sends a context modification request message to the first user plane network element.
  • Step 1311 The first user plane network element receives the context modification request message.
  • Step 1312 The first user plane network element sends a context modification response message to the first PDCP-C.
  • Step 1313 The first PDCP-C sends a handover command to the UE.
  • Step 1314 The UE sends a handover completion confirmation message to the first RRC.
  • the UE in the case where the UE determines that the UE is connected to the target cell, the UE can sequentially send the confirmation message through the second DU, the second PDCP-C, and the second RRC Sent to the first RRC.
  • the handover complete confirmation message is used to indicate to the first RRC that the UE has been handed over to the target cell.
  • the first RRC After the first RRC receives the handover completion confirmation message, the first RRC updates the context information of the AMF and the SMF, thereby indicating on the core network control plane function side that the UE has been handed over to the target cell.
  • step 1012 to step 1017 shown in FIG. 10 please refer to step 1012 to step 1017 shown in FIG. 10, and the specific execution process will not be repeated.
  • the first user plane network element may create packet filtering information and the address of the second user plane network element Mapping relationship, in the case that the first user plane network element receives a downlink data packet that matches packet filtering information, the first user plane network element sends the downlink data packet through the first forwarding path To the second user plane network element with the address of the second user plane network element, it is ensured that the first user plane network element and the second user plane network element are implemented without changing the IP address of the UE.
  • the creation of forwarding paths between network elements ensures the continuity of UE services through the first forwarding path.
  • the first user plane network element can create a mapping relationship between packet filtering information and the address of the second user plane network element, how does the UE realize the sending of uplink data packets?
  • the control plane network element performing the handover is the second Wireless network management function RNMF Take an example for illustrative description.
  • the communication system shown in this embodiment includes two RNMFs, namely a first RNMF 1401 and a second RNMF 1402. As well as the description of the second RNMF 1402, please refer to the description of the RNMF shown in FIG. 5, which will not be repeated. For the specific description of the network elements connected to the second RNMF 1402, please refer to the description of The description of each network element connected by the first RNMF will not be repeated in detail.
  • the communication system shown in this embodiment also includes a packet routing dispatch function (PDRF) 1403, and the PDRF 1403 is connected to all the network elements.
  • PDRF packet routing dispatch function
  • the first RNMF 1401 and the second RNMF 1402 are connected, and the PDRF 1403 is also connected to the first user plane network element 1404 and the second user plane network element 1405.
  • the specific execution process of the method shown in this embodiment will be described below in conjunction with FIG. 15:
  • Step 1501 The UE sends a measurement report to the first RNMF.
  • the first RNMF determines the target cell according to the received measurement report, the target cell is the cell to be handed over by the UE, and the first RNMF determines the target cell according to the target ID. Whether the target cell is within the service range of the first RNMF, this embodiment assumes that the target cell is not within the service range of the first RNMF and is used to serve the UE before the handover and the UE after the handover
  • the AMF, SMF, and UDM of the core network control plane function are not changed as an example for illustrative description.
  • the first RNMF determines the first RRC, and the first RRC is the RRC currently used to serve the UE, then the first RNMF sends handover indication information to the first RRC Wherein, the handover indication shown in this embodiment is used to instruct the first RRC to initiate an HO request.
  • Step 1502 The first RNMF sends a handover instruction to the first RRC.
  • Step 1503 The first RRC sends a handover request to the first RNMF.
  • step 1502 to step 1503 shown in this embodiment please refer to step 1002 to step 1003 shown in FIG. 10, and the details are not described in detail.
  • Step 1504 The first RNMF sends a handover request to the second RNMF.
  • the first RNMF may determine a second RNMF that can serve the handover UE according to the target ID, and the first RNMF may send the handover request to the determined second RNMF,
  • the handover request shown in this embodiment may carry a second DNN, second indication information, QoS profile, and packet filtering information corresponding to the QoS profile, and a detailed description of each parameter included in the handover request, Please refer to FIG. 10, which will not be described in detail in this embodiment.
  • Step 1505 The second RNMF sends a handover request to the second RRC.
  • the second RNMF determines a second RRC that can serve the handover UE based on the target ID, and sends the handover request to the determined second RRC.
  • the second RNMF requires a destination address, where the destination address is the address of the PDRF, for example, the address of the PDRF may be the IP address of the PDRF and/or the MAC of the PDRF address.
  • the first RNMF may determine the destination address, and carry the determined destination address in the handover request, and the specific process for the first RNMF to determine the destination address may be:
  • the first RNMF may select a PDRF based on the configuration of the first RNMF, that is, the first RNMF has been configured with a fixed PDRF, if the IP address of the PDRF and/or the MAC address of the PDRF is configured, then
  • the first RNMF may determine the IP address of the PDRF stored in the first RNMF and/or the MAC address of the TORF as the destination address based on the configuration; optionally, the first RNMF may also determine the PDRF in a dynamic query manner For example, in the case that the domain name system (domain name system, DNS) has been configured with the IP address of the PDRF and/or the MAC address of the PDRF, the first RNMF can obtain all information by means of the DNS query.
  • the destination address as another example, the first RNMF is based
  • the second RNMF can obtain the destination address, and the second RNMF can obtain the destination address.
  • the second RNMF can obtain the destination address.
  • the second RRC can establish an RRC context for the UE according to the handover request, and the second RRC is the UE's data connection (PDU Session) Allocate a data radio bearer (data radio bearer, DRB) identification (ID), where the PDU Session is used to establish a service for exchanging PDU data packets between the UE and the second DU, that is, to establish the UE and the second DU. Data transmission channel between two DUs.
  • the second RRC selects a second PDCP-C that can serve the handover UE based on the target ID.
  • Step 1506 The second RRC sends a PDU session resource establishment message to the second PDCP-C.
  • Step 1507 The second PDCP-C sends a context establishment request message to the second user plane network element.
  • step 1506 to step 1507 shown in this embodiment please refer to step 1005 to step 1006 shown in FIG. 10 for details, and the specific execution process will not be repeated.
  • Step 1508 The second user plane network element sends a context establishment response message to the second PDCP-C.
  • the context establishment response message shown in this embodiment carries the address of the second user plane network element and the DRB id.
  • the address of the second user plane network element may be the IP address of the second user plane network element and/or the MAC address of the second user plane network element.
  • Step 1509 The second PDCP-C sends a signaling message to the second DU.
  • the signaling message shown in this embodiment instructs the second DU to create a PDU session with the UE, and the second DU can establish a connection between the UE and the second DN according to the signaling message.
  • Data transmission channel instructs the second DU to create a PDU session with the UE, and the second DU can establish a connection between the UE and the second DN according to the signaling message.
  • Step 1510 The second PDCP-C sends a PDU session resource establishment response to the second RRC.
  • the second PDCP-C may send a PDU session resource setup response (PDU session resource setup response) to the second RRC .
  • PDU session resource setup response is used to indicate the completion of the PDU Session configuration, and the PDU session resource setup response may also carry the PDU session ID and the address of the second user plane network element.
  • Step 1511 The second RRC sends a handover request confirmation message to the second RNMF.
  • the second RRC After the second RRC receives the PDU session resource setup response, the second RRC sends a handover request confirmation message (HO Request Ack) message to the second RNMF, where the HO Request Ack message carries the PDU session ID and the address of the second user plane network element.
  • HO Request Ack handover request confirmation message
  • Step 1512 The second RNMF sends a route creation request message to the PDRF.
  • the second RNMF has determined the address that the PDRF has, that is, the destination address, then the second RNMF may send the create route request to the PDRF with the destination address Message, where the create routing request (create routing info) message includes the IP address of the UE and the address of the second user plane network element.
  • the IP address of the UE is allocated by the SMF for the UE and sent to the second RNMF.
  • the second RNMF directly sends the route creation request message to the PDRF as an example for exemplification.
  • the second RNMF may also send the route creation request message to the first RNMF. Then, the first RNMF forwards the route creation message to the PDRF.
  • the PDRF can create the mapping relationship between the IP address of the UE and the second forwarding path, and the PDRF receives the downlink data packet
  • the PDRF may determine the second forwarding path corresponding to the IP address of the UE based on the destination IP (that is, the IP address of the UE) in the downlink data packet header, and the PDRF passes through the first The second forwarding path forwards downlink data packets.
  • the second forwarding path shown in this embodiment is a forwarding path for transmitting downlink data packets to the address of the second user plane network element, that is, as shown in this embodiment
  • the PDRF may forward the downlink data packet to a second user plane network element with the qualification of the second user plane network element.
  • Step 1513 The PDRF sends a route creation request confirmation message to the second RNMF.
  • the PDRF After the PDRF has created the mapping relationship between the IP address of the UE and the second forwarding path, the PDRF sends a create routing info ack message to the second RNMF, where the create routing
  • the request confirmation message carries the IP address of the UE and the first indication parameter.
  • This embodiment does not limit the specific value of the first indication parameter, as long as the first indication parameter can indicate that the PDRF has created all the parameters.
  • the mapping relationship between the IP address of the UE and the second forwarding path is sufficient.
  • the value of the first indication parameter is success as an example for illustrative description.
  • Step 1514 The second RNMF sends a handover request confirmation message to the first RNMF.
  • the HO Request Ack message carries parameter information such as the first indication information, the destination address, and the packet filtering information, where the first indication information is used to indicate the first user plane
  • the network element creates a mapping relationship between the destination address and the packet filtering information.
  • Step 1515 The first RNMF sends a handover request confirmation message to the first RRC.
  • Step 1516 The first RRC sends a handover command to the first PDCP-C.
  • Step 1517 The first PDCP-C sends a context modification request message to the first user plane network element.
  • step 1515 to step 1517 shown in this embodiment please refer to step 1011 to step 1013 shown in FIG. 10 for details, and details are not described in detail.
  • Step 1518 The first user plane network element receives the context modification request message.
  • the first user plane network element may modify the mapping relationship of the packet filtering information according to the first indication information included in the context modification request message, for example, before the UE handover, the first The user plane network element has created the mapping relationship between the packet filtering information and the DRB, and in the case that the first user plane network element receives the first indication information, the first user plane network element will The mapping relationship between packet filtering information and DRB is modified to the mapping relationship between the packet filtering information and the destination address, and the mapping relationship between the packet filtering information and the DRB is modified on the first user plane network element.
  • the first user plane network element determines the IP in the downlink data packet If the quintuple information is the same as the packet filtering information, the first user plane network element can determine the first forwarding path corresponding to the packet filtering information, and the first user plane network element passes through the first forwarding path.
  • a forwarding path forwards downlink data packets.
  • the first forwarding path shown in this embodiment is a forwarding path for transmitting data packets to the destination address, that is, the first user plane network element shown in this embodiment
  • the downlink data packet can be forwarded to the PDRF with the destination address.
  • Step 1519 The first user plane network element sends a context modification response message to the first PDCP-C.
  • the context modification response message is used to indicate that the first user plane network element has successfully created the correspondence between the packet filtering information and the first forwarding path.
  • Step 1520 The first PDCP-C sends a handover command to the UE.
  • Step 1521 The UE sends a handover completion confirmation message to the first RNMF.
  • step 1519 to step 1521 shown in this embodiment please refer to the specific execution process of step 1015 to step 1017 shown in FIG. 10 for details, which will not be described in detail in this embodiment.
  • the first user plane network element may create a mapping relationship between packet filtering information and the destination address, and When the first user plane network element receives a downlink data packet that matches the packet filtering information, the first user plane network element sends the downlink data packet to the PDRF, and the PDRF then uses the created mapping The relationship forwards the downlink data packet to the second user plane network element, which ensures that the first user plane network element and the PDRF, and the PDRF and the second user plane network element and the PDRF are realized without changing the IP address of the UE.
  • the creation of forwarding paths between user plane network elements ensures the continuity of UE services through the first forwarding path.
  • the following is based on the fact that the UE shown in FIG. 15 has been handed over to the target cell, and how the transmission of uplink data packets and downlink data packets is realized after the UE is handed over to the target cell will be described below with reference to FIG. 16;
  • Step 1601 The first user plane network element receives a downlink data packet.
  • the first user plane network element 1404 receives a downlink data packet from the first DN 1406 through the N6 interface.
  • Step 1602 the first user plane network element determines the first forwarding path.
  • the first user plane network element has stored the mapping relationship between packet filtering information and the destination address, and when the first user plane network element receives the downlink data packet The first user plane network element may obtain the IP quintuplet information in the downlink data packet, and obtain the same packet filtering information as the IP quintuple information in the downlink data packet, and the first user plane network The element can determine the first forwarding path corresponding to the packet filtering information according to the stored mapping relationship, that is, the first user plane network element determines to send the downlink data packet to the PDRF1403 with the destination address .
  • Step 1603 The first user plane network element sends the downlink data packet to the PDRF.
  • the first forwarding path is a path for transmitting data packets to the destination address
  • the destination address is an address possessed by the PDRF.
  • the first user plane network element may The PDRF of the destination address sends the downlink data packet.
  • the PDRF shown in this embodiment has created a second forwarding path, then the PDRF can determine the corresponding second forwarding path according to the received downlink data packet, and pass The second forwarding path sends a downlink data packet to a second user plane network element.
  • Step 1605 The second user plane network element sends the downlink data packet to the UE.
  • the second user plane network element has created a mapping relationship between packet filtering information and the target DRB, and the second user plane network element receives a downlink data packet, the second user The plane network element may obtain the IP quintuple included in the downlink data packet, and obtain the packet filtering information corresponding to the IP quintuple information in the downlink data packet, and the second user plane network element may obtain For the target DRB corresponding to the packet filtering information, the second user plane network element may send the data packet to the UE through the target DRB.
  • the above steps illustrate how the downlink data packet is sent to the UE that has been handed over to the target cell, and the following steps illustrate how the uplink data packet is sent to the second DN.
  • Step 1606 The UE sends the uplink data packet to the second DU.
  • the UE 1400 may send the uplink data packets to The second DU1410.
  • Step 1607 The second DU sends the uplink data packet to the second user plane network element.
  • Step 1608 The second user plane network element sends the uplink data packet to the second DN.
  • the second user plane network element 1405 when the second user plane network element 1405 receives the uplink data packet sent by the UE 1400, the second user plane network element 1405 can pass The N6 interface sends the uplink data packet to the second DN 1411 to implement the transmission of the uplink data packet.
  • the first user plane network element can directly use the mapping relationship between the created packet filtering information and the destination address. Sending the downlink data packet to the PDRF , and then forwarding the downlink data packet to the second user plane network element by the PDRF, effectively guarantees the continuity of the UE service and improves the efficiency of data transmission.
  • the control plane network element performing the handover is the first A radio network management function RNMF is taken as an example for illustrative description.
  • the communication system shown in this embodiment also includes There is a PDRF1700.
  • the PDRF1700 shown in this embodiment is connected to the first RNMF 1701, and the PDRF1700 is also connected to a first user plane network element 1702 and a second user plane network element 1703, respectively.
  • the method shown in this embodiment specifically includes:
  • Step 1801 the UE sends a measurement report to the first RNMF.
  • Step 1802 the first RNMF sends a handover instruction to the first RRC.
  • Step 1803 The first RRC sends a handover request to the first RNMF.
  • Step 1804 The first RNMF sends a handover request to the second RRC.
  • Step 1805 The second RRC sends a PDU session resource establishment message to the second PDCP-C.
  • Step 1806 The second PDCP-C sends a context establishment request message to the second user plane network element.
  • step 1801 to step 1806 shown in this embodiment please refer to step 1001 to step 1006 shown in FIG. 10, which will not be described in detail in this embodiment.
  • Step 1807 The second user plane network element sends a context establishment response message to the second PDCP-C.
  • the second user plane network element receives the context establishment request message
  • the second user plane network element activates the user plane security context and related configuration, such as security-related configuration, and signaling addition
  • the configuration related to decryption is not specifically limited in this embodiment.
  • the second user plane network element creates a second mapping relationship according to the DRB id and the packet filtering information carried in the context establishment request message, and the second mapping relationship includes the packet filtering information and the DRB id The mapping relationship of the identified data radio bearer.
  • the context setup response (context setup response) message sent by the second user plane network element carries the DRB id and the address of the second user plane network element, for example, the first user plane network element shown in this embodiment
  • the address of the second user plane network element may be the IP address of the second user plane network element and/or the MAC address of the second user plane network element.
  • Step 1808 The second PDCP-C sends a signaling message to the second DU.
  • Step 1809 The second PDCP-C sends a PDU session resource establishment response to the second RRC.
  • Step 1810 The second RRC sends a handover request confirmation message to the first RNMF.
  • the second RRC After the second RRC receives the PDU session resource setup response, the second RRC sends a HO Request Ack message to the first RNMF, where the HO Request Ack message carries the PDU session ID and the address of the second user plane network element.
  • Step 1811 The first RNMF determines the destination address.
  • the destination address shown in this embodiment is the address of the PDRF.
  • the specific process of determining the destination address by the first RNMF shown in this embodiment refer to step 1505 shown in FIG. 15 It will not be described in detail in this embodiment.
  • Step 1812 The first RNMF sends a route creation request message to the PDRF.
  • the first RNMF has determined the address that the PDRF has, that is, the destination address, then the first RNMF may send the create route request to the PDRF with the destination address Message, where the create routing request (create routing info) message includes the IP address of the UE and the destination address.
  • the PDRF can create a second forwarding path.
  • the second forwarding path please refer to step 1512 shown in FIG. 15 for details. Do not repeat it.
  • Step 1813 The PDRF sends a route creation request confirmation message to the first RNMF.
  • the PDRF After the PDRF has created the mapping relationship between the UE’s IP address and the second forwarding path, the PDRF sends a create routing info ack message to the first RNMF, where the create routing
  • the request confirmation message carries the IP address of the UE and the first indication parameter.
  • This embodiment does not limit the specific value of the first indication parameter, as long as the first indication parameter can indicate that the PDRF has created all the parameters.
  • the mapping relationship between the IP address of the UE and the second forwarding path is sufficient.
  • the value of the first indication parameter is success as an example for illustrative description.
  • Step 1814 The first RNMF sends a handover request confirmation message to the first RRC.
  • Step 1815 The first RRC sends a handover command to the first PDCP-C.
  • Step 1816 The first PDCP-C sends a context modification request message to the first user plane network element.
  • Step 1817 The first user plane network element receives the context modification request message.
  • Step 1818 The first user plane network element sends a context modification response message to the first PDCP-C.
  • Step 1819 The first PDCP-C sends a handover command to the UE.
  • Step 1820 The UE sends a handover completion confirmation message to the first RNMF.
  • step 1515 to step 1521 shown in FIG. 15 for the specific execution process of step 1814 to step 1820 shown in this embodiment, please refer to step 1515 to step 1521 shown in FIG. 15 for details, which will not be repeated in this embodiment.
  • the first user plane network element may create a mapping relationship between packet filtering information and a destination address.
  • the first user plane network element receives a downlink data packet that matches the packet filtering information
  • the first user plane network element sends the downlink data packet to the PDRF
  • the PDRF uses the created mapping
  • the relationship forwards the downlink data packet to the second user plane network element, ensuring that the first user plane network element and the PDRF, and the PDRF and the second user plane network element and the PDRF are realized without changing the IP address of the UE.
  • the creation of forwarding paths between user plane network elements ensures the continuity of UE services through the first forwarding path.
  • the radio access network control plane function network element RRC1901 is taken as an example to illustrate. First, the structure of the communication system provided in FIG. 19 is described: The communication system shown in this embodiment includes a packet routing function logical network element (packet routing).
  • PDRF dispatch function
  • Step 2001 The UE sends a measurement report to the first RRC.
  • the first RRC determines the target cell according to the received measurement report, and for the specific process of determining the target cell by the first RRC, refer to the first RRC determination shown in step 1501 shown in FIG. 15 The process of the target cell will not be described in detail.
  • Step 2002 The first RCC sends a handover request to the second RRC.
  • the first RRC may determine a second RRC that can serve the handover UE according to the target ID, and the first RRC may send the handover request to the determined second RRC,
  • the handover request shown in this embodiment may carry a second DNN, second indication information, QoS profile, and packet filtering information corresponding to the QoS profile, and a detailed description of each parameter included in the handover request, Please refer to FIG. 10, which will not be described in detail in this embodiment.
  • the second RRC requires a destination address, where the destination address is the address of the PDRF,
  • the address of the PDRF may be the IP address of the PDRF and/or the MAC address of the PDRF.
  • the second RRC determines the destination address refer to the specific process of the second RNMF to determine the destination address shown in FIG. 15, and details are not described here.
  • the second RRC can establish an RRC context for the UE according to the handover request, and the second RRC is the UE's data connection (PDU Session) Allocate a data radio bearer (data radio bearer, DRB) identification (ID), where the PDU Session is used to establish a service for exchanging PDU data packets between the UE and the second DU, that is, to establish the UE and the second DU. Data transmission channel between two DUs.
  • the second RRC selects a second PDCP-C that can serve the handover UE based on the target ID.
  • Step 2003 The second RRC sends a PDU session resource establishment message to the second PDCP-C.
  • Step 2004 The second PDCP-C sends a context establishment request message to the second user plane network element.
  • Step 2005 The second user plane network element sends a context establishment response message to the second PDCP-C.
  • the context establishment response message shown in this embodiment carries the address of the second user plane network element and the DRB id.
  • the address of the second user plane network element may be the IP address of the second user plane network element and/or the MAC address of the second user plane network element.
  • Step 2006 The second PDCP-C sends a signaling message to the second DU.
  • the signaling message shown in this embodiment instructs the second DU to create a PDU session with the UE, and the second DU can establish a connection between the UE and the second DN according to the signaling message.
  • Data transmission channel instructs the second DU to create a PDU session with the UE, and the second DU can establish a connection between the UE and the second DN according to the signaling message.
  • Step 2007 The second PDCP-C sends a PDU session resource establishment response to the second RRC.
  • the second PDCP-C may send a PDU session resource setup response (PDU session resource setup response) to the second RRC .
  • PDU session resource setup response is used to indicate the completion of the PDU Session configuration, and the PDU session resource setup response may also carry the PDU session ID and the address of the second user plane network element.
  • step 1506 For the specific execution process from step 2003 to step 2007 shown in this embodiment, please refer to step 1506 to step 1510 shown in FIG. 15 for details, and the specific execution process will not be repeated.
  • Step 2008 The second RRC sends a route creation request message to the PDRF.
  • the second RRC may send the create route request message to the PDRF having the destination address,
  • the create route request message please refer to step 1512 shown in FIG. 15 for details, and details are not repeated in this embodiment.
  • Step 2009 The PDRF sends a route creation request confirmation message to the second RRC.
  • step 1513 shown in FIG. 15 For the specific execution process of step 2009 shown in this embodiment, please refer to step 1513 shown in FIG. 15 for details, and details are not described in detail.
  • Step 2010 The second RRC sends a handover request confirmation message to the first RRC.
  • the HO Request Ack message carries parameter information such as the first indication information, the destination address, and the packet filtering information, where the first indication information is used to indicate the first user plane
  • the network element creates a mapping relationship between the destination address and the packet filtering information.
  • Step 2011 The first RRC sends a handover command to the first PDCP-C.
  • the first RRC receives the handover command sent by the second RCC, the first RRC can send the handover command to the first PDCP-C.
  • Step 2012 The first PDCP-C sends a context modification request message to the first user plane network element.
  • Step 2013 The first user plane network element receives the context modification request message.
  • Step 2014 The first user plane network element sends a context modification response message to the first PDCP-C.
  • Step 2015 The first PDCP-C sends a handover command to the UE.
  • step 2012 to step 2015 shown in this embodiment please refer to the specific execution process from step 1517 to step 1520 shown in FIG. 15 for details, which will not be described in detail in this embodiment.
  • Step 2016 The UE sends a handover completion confirmation message to the first RRC.
  • the first user plane network element may create a mapping relationship between packet filtering information and the destination address, and When the first user plane network element receives a downlink data packet that matches the packet filtering information, the first user plane network element sends the downlink data packet to the PDRF, and the PDRF then uses the created mapping The relationship forwards the downlink data packet to the second user plane network element, ensuring that the first user plane network element and the PDRF, and the PDRF and the second user plane network element and the PDRF are realized without changing the IP address of the UE.
  • the creation of forwarding paths between user plane network elements ensures the continuity of UE services through the first forwarding path.
  • the communication system shown in this embodiment includes a logical network element PDRF2102 with a packet distribution function, and both PDRF2102 and the first RNMF2103 And the second RNMF 2101 is connected, and the PDRF 2102 is also connected to the first user plane network element 2104 and the second user plane network element 2105.
  • the communication system shown in this embodiment serves to serve the UE before and after handover.
  • RNMF, SMF, AMF, and UDM are all changed as examples for illustrative description. For another example, referring to FIG.
  • the UE 2106 before handover is served by the first RNMF 2103, the first AMF 2110, the first SMF 2111, and the first UDM 2112
  • the second RNMF2101, the second AMF2113, the second SMF2114, and the second UDM2115 are served for the UE2106 after the handover.
  • the specific execution process of the method shown in this embodiment will be described below with reference to FIG. 22:
  • Step 2201 the UE sends a measurement report to the first RNMF.
  • the measurement report shown in this embodiment is a measurement report generated after the UE measures the source cell where the UE resides, and specifically includes the measurement identifier ID, the measurement result of the source cell, and the measurement result of the neighboring cell. This embodiment does not limit the specific content included in the measurement report.
  • the UE2106 reports the measurement report to the first RNMF2103 through the first DU2107, the first PDCP-C2108, and the first RRC2109 in turn, where the first PDCP- Both the C2103 and the first RRC2104 are connected to the first RNMF 2103.
  • the first RNMF sends a handover instruction to the first RRC.
  • the first RNMF determines the target cell according to the received measurement report, the target cell is the cell to be handed over by the UE, and the first RNMF determines the target cell according to the target ID. Whether the target cell is within the service range of the first RNMF, optionally, the first RNMF may be preset with a service list, and the service list includes the identity of the cell that can be served by the first RNMF, then In this step, if the first RNMF determines that the identity of the target cell is in the service list, the first RNMF determines that the target cell is within the service range of the first RNMF, if If the identity of the target cell is not in the service list, the first RNMF determines that the target cell is not in the service range of the first RNMF.
  • the target cell is not within the service range of the first RNMF as an example for illustrative description. If the target cell is not within the service range of the first RNMF, it will be used to provide all services after handover.
  • the second RNMF, AMF, SMF, etc. served by the UE need to be changed.
  • the first RNMF determines the first RRC, and the first RRC is the RRC currently used to serve the UE, then the first RNMF sends handover indication information to the first RRC Wherein, the handover indication shown in this embodiment is used to instruct the first RRC to initiate an HO request.
  • Step 2203 The first RRC sends a handover request to the first RNMF.
  • step 2203 For the specific execution process of step 2203 shown in this embodiment, please refer to step 1503 shown in FIG. 15 for details, and the specific execution process will not be repeated in this embodiment.
  • Step 2204 The second RNMF obtains the handover request.
  • Step A1 The first RNMF sends the handover request to the first AMF.
  • the first RNMF determines the first AMF used to serve the UE before handover according to the received target ID, and sends the handover request to the first AMF, where the handover request It carries the second DNN, the second indication information (selection indication), the quality of service profile (QoS profile), and the packet filtering (Packet filter) information corresponding to the QoS profile.
  • the handover request carries the second DNN, the second indication information (selection indication), the quality of service profile (QoS profile), and the packet filtering (Packet filter) information corresponding to the QoS profile.
  • the handover request may also include a destination address determined by the first RNMF, where the destination address is the address of the PDRF, and for the specific process of determining the destination address by the first RNMF, please refer to Step 1505 shown in FIG. 15 is shown, which will not be described in detail in this embodiment.
  • Step A2 The first AMF sends a UE context creation request message to the second AMF.
  • the first AMF determines a second AMF based on the target ID, where the second AMF is an AMF used to serve the UE after the handover
  • the first AMF may send the create UE context request (create UE context request) message to the second AMF, and the create UE context request carries the second DNN and second indication information (selection indication information). ), the quality of service profile (QoS profile) and parameters such as packet filter information corresponding to the QoS profile, and the create UE context request may also carry the destination address.
  • the UE context creation request message shown in this embodiment further includes a second indication parameter, and the second indication parameter is used for Instructing the second SMF to omit execution of user plane function (UPF) selection, and the second indication parameter is also used to instruct the second SMF to omit execution of the N4 interface session between the second SMF and the UPF set up.
  • UPF user plane function
  • This embodiment does not limit the specific value of the second indication parameter.
  • the second SMF omits the execution of UPF selection and the execution of N4 interface session establishment.
  • This embodiment uses The value of the second indication parameter is SMF selection off and N4 session setup off as an example for illustration.
  • Step A3 The second AMF sends a create context request message to the second SMF.
  • the second AMF performs the creation of the UE context and determines a second SMF that can serve the UE after the handover, and the second AMF can send the create context request (create context request) message Sent to the second SMF, where the create context request includes all parameters included in the context request message.
  • Step A4 The second SMF sends a create context response message to the second ATM.
  • the second SMF may omit execution of UPF selection and omit execution according to the second indication parameter included in the create context request message
  • the N4 interface session is established.
  • the second SMF only creates the context of the UE locally, and sends a create context response message to the second ATM.
  • Step A5 The second ATM sends a handover request to the second RNMF.
  • the second ATM selects a second RNMF that can serve the handover UE according to the target ID, and the second ATM sends the handover request to the determined second RNMF, as shown in this embodiment
  • the handover request may carry the second DNN, the second indication information, the QoS profile, the packet filtering information corresponding to the QoS profile, and the destination address, and the specific description of each parameter included in the handover request, please For details, please refer to the above description, which will not be repeated.
  • Step A6 The second RNMF receives the handover request.
  • Step 2205 The second RNMF sends a handover request to the second RRC.
  • step 1505 For the specific execution process of step 2209 shown in this embodiment, please refer to step 1505 for details, which will not be described in detail; optionally, if the handover request does not include the destination address, the second RNMF may determine For the destination address, the specific process of determining the destination address by the second RNMF may refer to step 1505, and the details are not described in detail.
  • Step 2206 The second RRC sends a PDU session resource establishment message to the second PDCP-C.
  • Step 2207 The second PDCP-C sends a context establishment request message to the second user plane network element.
  • Step 2208 The second user plane network element sends a context establishment response message to the second PDCP-C.
  • Step 2209 The second PDCP-C sends a signaling message to the second DU.
  • Step 2210 The second PDCP-C sends a PDU session resource establishment response to the second RRC.
  • Step 2211 The second RRC sends a handover request confirmation message to the second RNMF.
  • Step 2212 The second RNMF sends a route creation request message to the PDRF.
  • Step 2213 The PDRF sends a route creation request confirmation message to the second RNMF.
  • step 1506 to step 1513 shown in FIG. 15 For the specific execution process of step 2206 to step 2213 shown in this embodiment, please refer to step 1506 to step 1513 shown in FIG. 15 for details, and the specific execution process will not be repeated.
  • Step 2214 The first RNMF obtains a handover request confirmation message.
  • Step B1 The second RNMF sends a handover request confirmation message to the second AMF.
  • the HO Request Ack message carries parameter information such as the first indication information, the destination address, and the packet filtering information, where the first indication information is used to indicate the first user plane
  • the network element creates a mapping relationship between the destination address and the packet filtering information.
  • Step B2 The second AMF sends a UE context creation response message to the first AMF.
  • the create UE context response (create UE context response) message sent by the second AMF to the first AMF in this embodiment carries parameters such as the first indication information, the destination address, and the packet filtering information Information and other parameters.
  • Step B3 The first AMF sends a handover request confirmation message to the first RNMF.
  • the handover request confirmation message shown in this embodiment carries parameters such as the first indication information, the destination address, and parameter information such as the packet filtering information.
  • Step B4 The first RNMF receives the handover request confirmation message sent by the first AMF.
  • Step 2215 The first RNMF sends a handover request confirmation message to the first RRC.
  • Step 2216 The first RRC sends a handover command to the first PDCP-C.
  • Step 2217 The first PDCP-C sends a context modification request message to the first user plane network element.
  • Step 2218 The first user plane network element receives the context modification request message.
  • Step 2219 The first user plane network element sends a context modification response message to the first PDCP-C.
  • Step 2220 The first PDCP-C sends a handover command to the UE.
  • Step 2221 The UE sends a handover completion confirmation message to the first RNMF.
  • step 2215 to step 2221 shown in this embodiment please refer to step 1515 to step 1521 shown in FIG. 15 for details, and the specific execution process will not be repeated in this embodiment.
  • the first user plane network element may create a mapping relationship between packet filtering information and the destination address, and When the first user plane network element receives a downlink data packet that matches the packet filtering information, the first user plane network element sends the downlink data packet to the PDRF, and the PDRF then uses the created mapping The relationship forwards the downlink data packet to the second user plane network element, ensuring that the UE’s IP address does not change and when the network element on the core network side serving the UE changes, the first user plane network is realized.
  • the creation of a forwarding path between the element and the PDRF, and the PDRF and the second user plane network element ensures the continuity of the UE service through the first forwarding path.
  • Step 2301. The second user plane network element sends event identification information to the second RNMF.
  • the second user plane network element may be pre-configured with a timer, and the second user plane network element monitors based on the timer that no service data transmission is performed on the data radio bearer corresponding to each packet filtering information The duration, if so The second user plane network element determines that there is a data radio bearer for data transmission before the timer expires, and then stops the timer of the data radio bearer to stop counting.
  • the second user plane network element acquires a data radio bearer that has not yet performed data transmission when the timer expires, and generates event identification information for the data radio bearer, the event identification information is used to identify the data radio bearer corresponding to the packet filtering information There is no event in which the duration of data transmission is greater than or equal to the preset duration.
  • the event identification information shown in this embodiment also includes the identification of the data radio bearer (DRB id) that has not performed data transmission when the timer expires, that is, the event identification information can also be used to identify the data corresponding to the DRB id An event where the duration of no data transmission on the radio bearer is greater than or equal to the preset duration.
  • DRB id data radio bearer
  • the second user plane network element sends the generated event identification information to the second RNMF.
  • the specific process of the second user plane network element sending event identification information to the second RNMF It may be that the second user plane network element sequentially sends the event identification information to the second RNMF through the second PDCP-C and the second RRC.
  • Step 2302 the second RNMF sends a context release message to the SMF.
  • the second RNMF may determine the PDU Session ID, and the PDU Session ID is used to identify the identity of the PDU session that needs to be released .
  • the second RNMF sends an event report (event report) message to the SMF, where the event report carries the PDU Session ID and various parameters included in the event identification information, and the context release message It is used to instruct the SMF to delete the context of the interface between the SMF and the second RRC.
  • event report event report
  • Step 2303 The SMF sends a session release request message to the second RNMF.
  • the SMF When the SMF receives the context release message, the SMF performs a PDU session release procedure, that is, the SMF deletes the context of the interface between the SMF and the second RRC according to the context release message. After the SMF successfully deletes the context of the interface between the SMF and the second RRC, the SMF sends a session release request message to the second RNMF, and the send session release request message carries the PDU session ID and a cause value (cause with re-establ ish requested), the cause with re-establ ish requested is used to instruct the UE to re-initiate PDU session establishment after the PDU session is released.
  • a cause value cause with re-establ ish requested
  • Step 2304 The second RNMF sends the session release request message to the second DU.
  • the second RNMF shown in this embodiment may send the session release request message to the second DU through the second RRC and the second PDCP-C in sequence.
  • Step 2305 The second DU sends a resource release message to the UE.
  • the second DU may carry the PDU session release accept/PDU session release accept and the cause with re-establ ish requested resource
  • a release message (resource release) message is sent to the UE, where the PDU session release accept is used to indicate that the second DU agrees to perform a PDU session resource release message.
  • Step 2306 The UE sends a PDU session release complete message to the second RNMF.
  • the UE can release the resources related to the PDU session.
  • the PDU session resource release message is sent to the second RNMF.
  • the UE may sequentially pass the second DU, the second PDCP-C, and the second RNMF.
  • the second RRC sends the session release complete message to the second RNMF.
  • Step 2307 The second RNMF sends a PDU session release instruction to the first RNMF.
  • the second RNMF After the second RNMF receives the PDU session release complete message, the second RNMF determines that the PDU session resource release of the UE on the target cell side is completed, and the second RNMF is the UE that continues to release the UE before the handover. The PDU session resource of the source cell where it resides, the second RNMF sends a PDU session release instruction to the first RNMF.
  • the first RNMF after the first RNMF receives the PDU session release instruction, the first RNMF initiates the release of PDU session resources on the first RRC, the first PDPC-C, and the first user plane network element.
  • Step 2308 The second RNMF sends the delete routing information to the PDRF.
  • the deletion routing information carries the IP address of the UE.
  • the PDRF has created the mapping relationship between the IP address of the UE and the second forwarding path, and the deletion is received in the PDRF.
  • the PDRF deletes the mapping relationship identified by the IP address of the UE, where the mapping relationship identified by the IP address of the UE is the IP address of the UE The mapping relationship between the address and the address of the second user plane network element.
  • Step 2309 The second RNMF sends a PDU session release response message to the SMF.
  • the second RNMF determines that the PDU session resource of the target cell, the PDU session resource of the source cell, and the mapping relationship stored on the PDRF are all released successfully
  • the second RNMF The SMF replies to a PDU session release response (PDU session release response) message, where the PDU session release response carries the PDU session ID and the third indication parameter shown above, which can be indicated by different values of the third indication parameter Whether the PDU session resource of the target cell, the PDU session resource of the source cell, and the mapping relationship stored on the PDRF are all released successfully, for example, if the value of the third indicator parameter is "success", then The third indication parameter is used to indicate whether the PDU session resource of the target cell, the PDU session resource of the source cell, and the mapping relationship stored on the PDRF are all released successfully, for example, if the third indication The value of the parameter is "fai lure", then the third indication parameter is used to indicate at least one of the PDU session resource of the target cell, the PDU session release
  • the second RNMF may request the SMF to initiate the PDU session release process, and the SMF may also use cause with re-establ ish requested instructs the UE to re-initiate PDU session establishment after the PDU session is released.
  • the second RNMF can simultaneously delete the mapping relationship on the PDRF and the context information related to the PDU session on the first user plane network element.
  • the specific structure of the user plane network element provided in this embodiment will be exemplarily described below with reference to FIG. 24.
  • the user plane network element shown in FIG. 24 is the first user plane network element shown in the foregoing embodiment.
  • the specific process of the method for the user plane network element to perform handover processing can be seen in the foregoing embodiment for details, and details are not described in detail;
  • the user plane network element includes:
  • the obtaining unit 2401 is configured to obtain a first mapping relationship, where the first mapping relationship includes a correspondence between packet filtering information and an identifier of a data radio bearer, the packet filtering information includes an IP quintuple, and the data radio bearer is used for Carrying data packets;
  • a receiving unit 2402 configured to receive the address of the second user plane network element and the packet filtering information;
  • the processing unit 2403 is configured to send the data packet to the address of the second user plane network element according to the packet filtering information.
  • the receiving unit 2402 is further configured to receive the data packet
  • the obtaining unit 2401 is further configured to obtain the packet filtering information included in the data packet.
  • the receiving unit 2402 is further configured to receive instruction information from a control plane network element, where the instruction information is used to instruct the first user plane network element to report to the second user plane network element according to the packet filtering information.
  • the address of the network element sends the data packet.
  • the beneficial effects of the method for performing handover processing by the user plane network element shown in this embodiment please refer to the above-mentioned embodiment, and the details are not repeated in this embodiment.
  • the specific structure of the user plane network element provided in this embodiment will be exemplarily described below with reference to FIG. 25. It should be clear that the user plane network element shown in this embodiment is the second user plane network element shown in the above embodiment.
  • the specific process of the method for the second user plane network element to perform handover processing can be seen in the foregoing embodiment for details, and details are not described in detail;
  • the second user plane network element includes:
  • the obtaining unit 2501 is configured to obtain a second mapping relationship, where the second mapping relationship includes the correspondence between the packet filtering information and a data radio bearer, the packet filtering information includes an IP quintuple, and the data radio bearer is used for Carrying data packets;
  • the sending unit 2502 is configured to send the address of the second user plane network element to the control plane network element, where the address of the second user plane network element is used by the first user plane network element to send information to the control plane network element according to the packet filtering information.
  • the address of the second user plane network element sends the data packet.
  • the user plane network element further includes a receiving unit 2503, configured to receive the data packet from the first user plane network element;
  • the obtaining unit 2501 is further configured to obtain the packet filtering information included in the data packet;
  • the user plane network element further includes a determining unit 2504, configured to determine to send the data packet through the data radio bearer according to the packet filtering information and the second mapping relationship.
  • control plane network element includes:
  • the sending unit 2601 is configured to send packet filtering information and an identifier of a data radio bearer to a second user plane network element, where the packet filtering information includes an IP quintuple, and the data radio bearer is used to carry data packets;
  • the receiving unit 2602 is configured to receive the address of the second user plane network element from the second user plane network element; the sending unit 2601 is also configured to combine the address of the second user plane network element and the The packet filtering information is sent to the first user plane network element, and the address of the second user plane network element is used by the first user plane network element according to the packet filtering information Sending the data packet to the address of the second user plane network element.
  • the sending unit 2601 is further configured to send first instruction information to the first user plane network element, where the instruction information is used to instruct the first user plane network element to send a message to the first user plane network element according to the packet filtering information.
  • the address of the second user plane network element sends the data packet.
  • the data switching device shown in this embodiment is used to execute the data transmission method shown in any of the foregoing embodiments. For details, please refer to any of the foregoing embodiments.
  • the data switching device shown in this embodiment includes:
  • the data switching device 2700 includes at least one processor 2701, a communication bus 2702, a memory 2703, and at least one communication interface 2704 .
  • the processor 2701 may be a general-purpose central processing unit (central processing unit, CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more programs for controlling the execution of the program of the present invention integrated circuit.
  • CPU central processing unit
  • ASIC application-specific integrated circuit
  • the communication bus 2702 may include a path to transmit information between the above-mentioned components.
  • the communication interface 2704 uses any device such as a transceiver to communicate with other devices or communication networks.
  • the memory 2703 can be a read-only memory (ROM) or other types of static storage devices that can store static information and instructions, random access memory (RAM), or other types that can store information and instructions
  • the dynamic storage device can also be electrically erasable programmable read-only memory (EEPR0M), CD-ROM (compact disc read-only memory, CD-ROM) or other CD-ROM storage, CD-ROM storage (Including compact discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or can be used to carry or store desired program codes in the form of instructions or data structures and can be used by a computer Any other media accessed, but not limited to this.
  • the memory can exist independently and is connected to the processor through a bus.
  • the memory can also be integrated with the processor.
  • the memory 2703 is used to store application program codes for executing the solutions of the present application, and is controlled and executed by the processor 2701.
  • the processor 2701 is configured to execute the application program code stored in the memory 2703, so as to realize the logic function of the data switching device 2700.
  • the processor 2701 may include one or more CPUs, such as CPU0 and CPU1 in FIG. 27.
  • the data switching apparatus 2700 may include multiple processors, such as FIG.
  • processors can be a single-core (single-CPU) processor or a multi-core (multi-CPU) processor.
  • the processor here may refer to one or more devices, circuits, and/or processing cores for processing data (for example, computer program instructions).
  • the data switching apparatus 2700 may further include an output device 2705 and an input device 2706.
  • the output device 2705 communicates with the processor 2701, and can display information in a variety of ways.
  • the aforementioned data switching device 2700 may be a general-purpose computer device or a special-purpose computer device.
  • the disclosed system, device, and method may be implemented in other ways.
  • the device embodiments described above are merely illustrative.
  • the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not implemented.
  • the displayed or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, the indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.
  • the functional units in the various embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.
  • the above-mentioned integrated unit can be realized in the form of hardware or software functional unit.
  • the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium.
  • the technical solution of the present invention essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium , Including several instructions to enable a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in each embodiment of the present invention.
  • the aforementioned storage media include: U disk, mobile hard disk, Read-Only Memory (ROM, Read-Only Memory), Random Access Memory (RAM, Random Access Memory), magnetic disks or optical disks and other media that can store program codes .

Abstract

Le mode de réalisation de la présente invention concerne un procédé de traitement de commutation, un dispositif associé, un produit programme et un support de stockage. Le procédé comprend les étapes au cours desquelles : un premier élément de réseau de plan utilisateur obtient une première relation de mise en correspondance contenant une correspondance entre des informations de filtrage de paquets et un identifiant relatif à une porteuse radio de données, les informations de filtrage de paquets contenant un quintet IP et la porteuse radio de données étant utilisée pour porter des paquets de données ; le premier élément de réseau de plan utilisateur reçoit l'adresse d'un second élément de réseau de plan utilisateur et les informations de filtrage de paquets ; et le premier élément de réseau de plan utilisateur envoie le paquet de données à l'adresse du second élément de réseau de plan utilisateur en fonction des informations de filtrage de paquets. Le procédé garantit efficacement la continuité de services d'UE.
PCT/CN2019/118759 2019-02-28 2019-11-15 Procédé de traitement de commutation, dispositif associé, produit programme et support de stockage WO2020173146A1 (fr)

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