WO2018233499A1 - 一种通信方法及装置 - Google Patents

一种通信方法及装置 Download PDF

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Publication number
WO2018233499A1
WO2018233499A1 PCT/CN2018/090497 CN2018090497W WO2018233499A1 WO 2018233499 A1 WO2018233499 A1 WO 2018233499A1 CN 2018090497 W CN2018090497 W CN 2018090497W WO 2018233499 A1 WO2018233499 A1 WO 2018233499A1
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WO
WIPO (PCT)
Prior art keywords
information
network element
terminal
session management
session
Prior art date
Application number
PCT/CN2018/090497
Other languages
English (en)
French (fr)
Inventor
唐廷芳
李岩
倪慧
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to KR1020197036161A priority Critical patent/KR102263338B1/ko
Priority to EP22204334.1A priority patent/EP4192187A1/en
Priority to ES18821305T priority patent/ES2934316T3/es
Priority to BR112019027227-5A priority patent/BR112019027227A2/pt
Priority to JP2019569904A priority patent/JP6976362B2/ja
Priority to EP18821305.2A priority patent/EP3618472B1/en
Publication of WO2018233499A1 publication Critical patent/WO2018233499A1/zh
Priority to US16/688,082 priority patent/US10785635B2/en
Priority to US16/930,710 priority patent/US11218867B2/en
Priority to US17/551,551 priority patent/US20220109973A1/en

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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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H04W8/08—Mobility data transfer
    • H04W8/12—Mobility data transfer between location registers or mobility servers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/22—Manipulation of transport tunnels
    • 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
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/32—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/02—Services making use of location information
    • H04W4/021—Services related to particular areas, e.g. point of interest [POI] services, venue services or geofences
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/02—Services making use of location information
    • H04W4/025—Services making use of location information using location based information parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/08—Upper layer protocols
    • H04W80/10—Upper layer protocols adapted for application session management, e.g. SIP [Session Initiation Protocol]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/20—Selecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W60/00—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration
    • H04W60/04—Affiliation to network, e.g. registration; Terminating affiliation with the network, e.g. de-registration using triggered events
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
    • H04W68/005—Transmission of information for alerting of incoming communication

Definitions

  • the present application relates to the field of information technology, and in particular, to a communication method and apparatus.
  • the Tracking Area Identifier (TAI) in the Tracking Area List (TAList) allocated by the Mobile Management Entity (MME) belongs to the terminal.
  • the Access and Mobility Management Function (AMF) entity allocates a registration area list to the terminal.
  • the AMF entity selects a suitable Session Management Function (SMF) entity for the session, and each SMF entity interfaces with at least one User Plane Function (UPF).
  • SMF Session Management Function
  • UPF User Plane Function
  • the radio access network (RAN) resource of the session is released, and the N3 interface connection between the UPF and the RAN of the session is released, if the terminal has moved out of the UPF serving as a terminal service.
  • the service area when the UPF receives the initial downlink data of the terminal, the network side must first page the terminal within the registration area, then allocate RAN resources to the terminal, establish a connection on the RAN side, and restore the UPF and the radio access network. Connected between the N3 interfaces. As the terminal has moved to the service area of the other UPF, the terminal cannot connect to the UPF serving the terminal, and the initial downlink data cannot be received. As a result, the initial downlink data transmission fails and the related service fails to be established.
  • RAN radio access network
  • the present application provides a communication method and apparatus for solving the problem of how to prevent downlink data transmission failure of a terminal when the terminal replaces the UPF.
  • An embodiment of the present application provides a communication method, where the method includes:
  • An embodiment of the present application provides a communication method, where the method includes:
  • the access network element receives the tunnel information of the first session from the mobility management network element, where the tunnel information is a tunnel between the access network element and the first user plane network element that receives the downlink data of the terminal.
  • Information is a tunnel between the access network element and the first user plane network element that receives the downlink data of the terminal.
  • the access network element determines that the tunnel information is invalid, and sends first information to the session management network element, where the first information is used to indicate that the tunnel information is invalid.
  • the access network element determines whether the received tunnel information is valid, and after determining that the tunnel information is invalid, indicates to the session management network element that the tunnel information is invalid, so that the session management network element can determine the tunnel in time.
  • the information is invalid, so that the service of the terminal can be established in a timely and effective manner, and the service establishment failure caused by the establishment of the service according to the invalid tunnel information is avoided.
  • the access network element determines that the tunnel information is invalid, and includes:
  • the network element of the access network determines that the first user plane network element corresponding to the tunnel information cannot be connected, and determines that the tunnel information is invalid.
  • An embodiment of the present application provides a communication method, where the method includes:
  • the session management network element receives the first information from the access network element, where the first information is used to indicate that the tunnel information of the first session is invalid, and the tunnel information is the downlink data of the access network element and the received terminal. Information about the tunnel between the first user plane network element;
  • the session management network element After receiving the first information, the session management network element updates the tunnel information of the first session.
  • the session management network element can determine that the tunnel information of the first session is invalid according to the first message, so that the service establishment failure caused by the establishment of the service according to the invalid tunnel information can be avoided.
  • the first information includes an identifier and a cause value of the first session, where the first session is associated with the tunnel, and the cause value is used to indicate that the tunnel information is invalid.
  • An embodiment of the present application provides a communication method, where the method includes:
  • the mobility management network element receives session management information and location area information from the session management network element, and determines location information of the terminal;
  • the mobility management network element determines, according to the location area information and the location information, that the terminal is located outside the service area indicated by the location area information, and indicates to the session management network element that the session management information is not forwarded. And triggering the session management network element to update the session management information.
  • the mobility management network element when the mobility management network element determines that the terminal is located outside the service area indicated by the location area information according to the location area information and the location information, the mobility management network element may indicate to the session management network element to update the session. Management information, so that the service of the terminal can be established in a timely and effective manner, and the service establishment failure of the terminal due to the service area of other user plane network elements is avoided.
  • the mobility management network element indicates to the session management network element that the session management information is not forwarded, and triggers the session management network element to update the session management information, including:
  • the mobility management network element sends a first message to the session management network element, where the first message indicates that the session management information is not forwarded, and triggers the session management network element to update the session management information.
  • An embodiment of the present application provides a communication method, where the method includes:
  • the session management network element sends session management information and location area information to the mobility management network element;
  • the session management network element learns from the mobility management network element that the session management information is not forwarded, wherein the session management information is not forwarded and associated with the location area information and location information of the terminal;
  • the session management network element updates the session management information.
  • the session management network element learns that the session management information is not forwarded from the mobility management network element, the session management information can be updated, so that the terminal can establish a service according to the latest session management information, and the service establishment failure of the terminal is avoided. .
  • the session management network element learns from the mobility management network element that: updating the session management information includes:
  • the session management network element receives a first message from the mobility management network element, where the first message is used to indicate: updating the session management information.
  • the first message further includes a cause value, where the cause value is used to indicate that the session management information is not forwarded or the session management information needs to be updated.
  • the first message further includes the location information.
  • the location area information includes information about a service area of the first user plane network element that receives the downlink data of the terminal.
  • the updated session management information includes information about a second user plane network element that transmits data for the terminal.
  • An embodiment of the present application provides a communication method, where the method includes:
  • the mobility management network element receives session management information and condition information from the session management network element, and determines status information of the terminal;
  • the mobility management network element determines that the status information of the terminal satisfies the condition information, forwarding the session management information.
  • the mobility management network element determines that the location information of the terminal does not satisfy the location area condition information
  • the mobility management network element sends a first message for triggering the session management network element to update the session management information to the session management network element, so that the terminal can be guaranteed.
  • the service can be established in a timely and effective manner, and the service establishment failure of the terminal due to the service area of other user plane network elements is avoided.
  • the status information of the terminal is location information of the terminal, and the condition information includes: location area information.
  • the status information of the terminal is a status of the terminal
  • the condition information includes: the status of the terminal is a connected state.
  • it also includes:
  • the mobility management network element determines that the status information of the terminal does not satisfy the condition information, the mobility management network element indicates to the session management network element that the session management information is updated.
  • An embodiment of the present application provides a communication method, where the method includes:
  • the session management network element sends session management information and condition information to the mobility management network element, wherein the forwarding or updating of the session management information is associated with the condition information and status information of the terminal.
  • the status information of the terminal is location information of the terminal, and the condition information includes: location area information.
  • the status information of the terminal is a status of the terminal
  • the condition information includes: the status of the terminal is a connected state.
  • it also includes:
  • the mobility management network element determines that the status information of the terminal does not satisfy the condition information, the mobility management network element indicates to the session management network element that the session management information is updated.
  • An embodiment of the present application provides a communication method, where the method includes:
  • the session management network element acquires location information of the terminal.
  • the session management network element determines, according to the location information type, that the terminal is located outside the service area of the user plane network element corresponding to the first session of the terminal, and determines, according to the location information of the terminal, that the terminal transmits data.
  • the second user plane network element determines, according to the location information type, that the terminal is located outside the service area of the user plane network element corresponding to the first session of the terminal, and determines, according to the location information of the terminal, that the terminal transmits data.
  • the session management network element determines that the terminal is located outside the service area of the user plane network element corresponding to the first session of the terminal, and may determine that the session information is received.
  • the tunnel information is invalid, so that the second user plane network element that transmits the data for the terminal is re-determined according to the location information of the terminal, so as to ensure that the service of the terminal can be established in a timely and effective manner, and the terminal is prevented from being located in the service area of other user plane network elements.
  • the session management network element obtains location information of the terminal, including:
  • the session management network element After receiving the downlink data notification message, the session management network element requests location information of the terminal from the mobility management network element; the session management network element receives location information of the terminal from the mobility management network element;
  • the session management network element determines, according to at least one of the mobile attribute and the location information, that the terminal is located outside the service area of the first user plane network element corresponding to the first session of the terminal, and includes:
  • the session management network element determines that the terminal is located outside the service area of the first user plane network element corresponding to the first session of the terminal, according to the location information received from the mobility management network element.
  • the method further includes:
  • the session management network element sends session management information including the second tunnel information corresponding to the second user plane network element to the mobility management network element.
  • An embodiment of the present application provides a communication method, where the method includes:
  • the mobility management network element receives the first message from the session management network element, where the first message does not carry session management information, and the first message is used to request location information of the terminal;
  • the mobility management network element receives a paging response including the location information, and sends the location information to the session management network element according to the first message.
  • the embodiment of the present application provides a communication device, where the device includes:
  • a transceiver unit configured to receive tunnel information of the first session from the mobility management network element, where the tunnel information is a tunnel between the network element of the access network and the first user plane network element that receives downlink data of the terminal Information;
  • the processing unit is configured to determine that the tunnel information is invalid, and send first information to the session management network element, where the first information is used to indicate that the tunnel information is invalid.
  • processing unit is specifically configured to:
  • the embodiment of the present application provides a communication device, where the device includes:
  • the transceiver unit is configured to receive the first information from the access network element, where the first information is used to indicate that the tunnel information of the first session is invalid, and the tunnel information is the downlink of the access network element and the received terminal. Information about the tunnel between the first user plane network elements of the data;
  • the processing unit is configured to update the tunnel information of the first session after receiving the first information.
  • the first information includes an identifier and a cause value of the first session, where the first session is associated with the tunnel, and the cause value is used to indicate that the tunnel information is invalid.
  • the embodiment of the present application provides a communication device, where the device includes:
  • a transceiver unit configured to receive session management information and location area information from the session management network element, and determine location information of the terminal;
  • a processing unit configured to determine, according to the location area information and the location information, that the terminal is located outside a service area indicated by the location area information;
  • the transceiver unit is configured to indicate to the session management network element that the session management information is not forwarded, and trigger the session management network element to update the session management information.
  • the transceiver unit is specifically configured to:
  • the embodiment of the present application provides a communication device, where the device includes:
  • a transceiver unit configured to send session management information and location area information to the mobility management network element; and learn from the mobility management network element that the session management information is not forwarded, where the session management information is not forwarded
  • the location area information is associated with location information of the terminal
  • a processing unit configured to update the session management information.
  • the transceiver unit is specifically configured to:
  • the first message includes first information, where the first information is used to indicate that the session management information is not forwarded or the session management information needs to be updated.
  • the first message further includes the location information.
  • the location area information includes information about a service area of the first user plane network element that receives the downlink data of the terminal.
  • the updated session management information includes information about a second user plane network element that transmits data for the terminal.
  • the embodiment of the present application provides a communication device, where the device includes:
  • a transceiver unit configured to acquire location information of the terminal
  • a processing unit configured to determine, according to the location information type, that a service area of the user plane network element corresponding to the first session of the terminal is located, and determine, according to location information of the terminal, that the terminal transmits data The second user plane network element.
  • the transceiver unit is specifically configured to:
  • the session management network element After receiving the downlink data notification message, requesting, by the mobility management network element, location information of the terminal; the session management network element receiving location information of the terminal from the mobility management network element;
  • the processing unit is configured to: determine, according to the location information received from the mobility management network element, that the terminal is located outside a service area of the first user plane network element corresponding to the first session of the terminal.
  • the transceiver unit is further configured to:
  • the embodiment of the present application provides a communication device, where the device includes:
  • a transceiver configured to receive tunnel information of the first session from the mobility management network element, where the tunnel information is a tunnel between the network element of the access network and the first user plane network element that receives downlink data of the terminal Information;
  • the processor is configured to determine that the tunnel information is invalid, and send first information to the session management network element, where the first information is used to indicate that the tunnel information is invalid.
  • the processor is specifically configured to:
  • the embodiment of the present application provides a communication device, where the device includes:
  • the transceiver is configured to receive the first information from the access network element, where the first information is used to indicate that the tunnel information of the first session is invalid, and the tunnel information is the downlink of the access network element and the received terminal Information about the tunnel between the first user plane network elements of the data;
  • the processor is configured to update the tunnel information of the first session after receiving the first information.
  • the first information includes an identifier and a cause value of the first session, where the first session is associated with the tunnel, and the cause value is used to indicate that the tunnel information is invalid.
  • the embodiment of the present application provides a communication device, where the device includes:
  • a transceiver configured to receive session management information and location area information from the session management network element, and determine location information of the terminal
  • a processor configured to determine, according to the location area information and the location information, that the terminal is located outside a service area indicated by the location area information;
  • the transceiver is configured to indicate to the session management network element that the session management information is not forwarded, and trigger the session management network element to update the session management information.
  • the transceiver is specifically configured to:
  • the embodiment of the present application provides a communication device, where the device includes:
  • a transceiver configured to send session management information and location area information to the mobility management network element; and learn from the mobility management network element that the session management information is not forwarded, where the session management information is not forwarded
  • the location area information is associated with location information of the terminal;
  • a processor configured to update the session management information.
  • the transceiver is specifically configured to:
  • the first message includes first information, where the first information is used to indicate that the session management information is not forwarded or the session management information needs to be updated.
  • the first message further includes the location information.
  • the location area information includes information about a service area of the first user plane network element that receives the downlink data of the terminal.
  • the updated session management information includes information about a second user plane network element that transmits data for the terminal.
  • the embodiment of the present application provides a communication device, where the device includes:
  • a transceiver configured to acquire location information of the terminal
  • a processor configured to determine, according to the location information, a service area of the user plane network element corresponding to the first session of the terminal that is located by the terminal, and determine, according to the location information of the terminal, that the terminal transmits data.
  • the second user plane network element configured to determine, according to the location information, a service area of the user plane network element corresponding to the first session of the terminal that is located by the terminal, and determine, according to the location information of the terminal, that the terminal transmits data.
  • the transceiver is specifically used to:
  • the session management network element After receiving the downlink data notification message, requesting, by the mobility management network element, location information of the terminal; the session management network element receiving location information of the terminal from the mobility management network element;
  • the processor is specifically configured to: determine, according to the location information received from the mobility management network element, that the terminal is located outside a service area of the first user plane network element corresponding to the first session of the terminal.
  • the transceiver is further configured to:
  • Embodiments of the present application provide a computer storage medium in which instructions are stored in a computer storage medium, and when executed on a computer, cause the computer to execute the method in any of the foregoing communication methods.
  • the embodiment of the present application further provides a communication system, which includes the communication device provided by any one of the above designs.
  • the system may further include the interaction with the communication device in the solution provided by the embodiment of the present application. other devices.
  • the embodiment of the present application also provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method described in the above aspects.
  • Figure 1 is a schematic diagram of a possible 5G network architecture
  • FIG. 2 is a schematic flowchart of a communication method according to an embodiment of the present application.
  • FIG. 3 is a schematic flowchart of a communication method according to an embodiment of the present application.
  • FIG. 4 is a schematic flowchart of a communication method according to an embodiment of the present application.
  • FIG. 5 is a schematic flowchart of a communication method according to an embodiment of the present application.
  • FIG. 6 is a schematic flowchart of a communication method according to an embodiment of the present application.
  • FIG. 7 is a schematic flowchart of a communication method according to an embodiment of the present application.
  • FIG. 8 is a schematic flowchart of a communication method according to an embodiment of the present application.
  • FIG. 9 is a schematic flowchart of a communication method according to an embodiment of the present application.
  • FIG. 10 is a schematic flowchart of a communication method according to an embodiment of the present application.
  • FIG. 11 is a schematic flowchart of a communication method according to an embodiment of the present application.
  • FIG. 12 is a schematic flowchart of a communication method according to an embodiment of the present application.
  • FIG. 13 is a schematic structural diagram of a communication apparatus according to an embodiment of the present application.
  • FIG. 14 is a schematic structural diagram of a communication apparatus according to an embodiment of the present application.
  • FIG. 15 is a schematic structural diagram of a communication apparatus according to an embodiment of the present application.
  • FIG. 16 is a schematic structural diagram of a communication apparatus according to an embodiment of the present application.
  • FIG. 17 is a schematic structural diagram of a communication apparatus according to an embodiment of the present application.
  • FIG. 18 is a schematic structural diagram of a communication apparatus according to an embodiment of the present application.
  • FIG. 19 is a schematic structural diagram of a communication apparatus according to an embodiment of the present application.
  • FIG. 20 is a schematic structural diagram of a communication apparatus according to an embodiment of the present application.
  • FIG. 21 is a schematic structural diagram of a communication apparatus according to an embodiment of the present application.
  • FIG. 22 is a schematic structural diagram of a communication apparatus according to an embodiment of the present application.
  • the embodiments of the present application can be applied to various mobile communication systems, such as mobile communication systems such as 5G (for example, New Radio (NR), Next Generation Core Network).
  • 5G for example, New Radio (NR), Next Generation Core Network
  • FIG. 1 it is a schematic diagram of a possible 5G network architecture.
  • NWDA Network Data Analytics
  • AMF Access and Mobility Management Function
  • SMF Session Management Function
  • PCF Policy Control Function
  • AN Access Network
  • UPF User Plane Function
  • Data Network Data Network, DN
  • the SMF is responsible for session management, Internet Protocol (IP) address allocation and management of the terminal, allocation and selection of the UP anchor function, and is responsible for (heavy) selection of the UPF and user plane paths.
  • IP Internet Protocol
  • AMF is responsible for access and mobility management. It is the endpoint of N2 (interface between AMF and RAN devices) interface, completes registration management, connection management and reachability management, distribution of registration area list (Registration Area list) and mobility.
  • the UPF is a user plane function device, which is responsible for providing services such as routing and forwarding of data packets, lawful interception, and downlink data packet buffering and triggering downlink data packet notification messages.
  • FIG. 1 is a schematic diagram of a network structure provided by an embodiment of the present application.
  • Each UPF has a corresponding service area, and each service area includes at least one RAN.
  • the RAN3 including the RAN2 and the UPF3 in the service area including the RAN1 and the UPF2 in the service area of the UPF1 includes RAN3 as an example.
  • UPF1 is the Anchor UPF of the session
  • UPF2 and UPF3 are the non-anchor UPFs of the session.
  • the network side selects an appropriate UPF as the terminal service and assigns an IP address to the terminal.
  • the network side selects UPF1 as a terminal service, and assigns an IP to the terminal, and then UPF1 anchors the IP and provides an N3 connection for the terminal.
  • the DN is forwarded to the UPF1, and then forwarded by the UPF1 to the terminal through the RAN1 in its service area.
  • the transmission path of the uplink data of the terminal is opposite to the transmission path of the downlink data, and details are not described herein again.
  • the N3 connection of the data transmission of the session of the terminal is provided by the UPF2, and the UPF1 still anchors the IP of the session to provide the N6 connection for the session, and the downlink data of the terminal at this time.
  • the DN forwards to UPF1, and then forwards it to UPF2 by UPF1, which then forwards it to the terminal through RAN2 in its service area.
  • the transmission path of the uplink data of the terminal is not described here.
  • the N3 connection of the data transmission of the session of the terminal is provided by the UPF3, and the UPF1 still anchors the IP of the session to provide the N6 connection for the session, and the downlink data of the terminal at this time.
  • the DN forwards to UPF1, and then forwards it to UPF3 by UPF1, which then forwards it to the terminal through RAN3 in its service area.
  • the transmission path of the uplink data of the terminal is not described here.
  • the terminal moves from the service area of the UPF1 to the service area of the UPF2, and the network side still lowers the terminal.
  • the data is sent to UPF1, which causes the terminal to receive downlink data.
  • the terminal moves from the service area of the UPF2 to the service area of the UPF3, and the above problem also exists.
  • the present application provides a communication method and apparatus for solving the above problem.
  • the method and apparatus may be applicable to a scenario in which a terminal moves from a service area of the UPF1 to a service area of the UPF2, and may also be applicable to a terminal moving from a service area of the UPF2.
  • the scenario to the service area of UPF3 will be described in detail below.
  • the mobility management network element may refer to a device such as an AMF; the session management network element may refer to a device such as an SMF; and the user plane network element may be a device such as a UPF.
  • a terminal also referred to as a user equipment (User Equipment) is a device that provides voice and/or data connectivity to a user, for example, a handheld device with an wireless connection function, and an in-vehicle device. Wait.
  • Common terminals include, for example, mobile phones, tablets, notebook computers, PDAs, mobile internet devices (MIDs), wearable devices such as smart watches, smart bracelets, pedometers, and the like.
  • the access network element may be an ordinary base station (such as a Node B or an eNB), may be a new radio controller (NR controller), or may be a gNode B (gNB) in a 5G system. It may be a centralized unit, which may be a new radio base station, may be a radio remote module, may be a micro base station, may be a relay, or may be a distributed network element (Distributed Unit), It is a Transmission Reception Point (TRP) or a Transmission Point (TP) or any other wireless access device, but the embodiment of the present application is not limited thereto.
  • NR controller new radio controller
  • gNB gNode B
  • gNB gNode B
  • It may be a centralized unit, which may be a new radio base station, may be a radio remote module, may be a micro base station, may be a relay, or may be a distributed network element (Distributed Unit), It is a Transmission Reception Point (TRP) or a Transmission
  • the access network element is not necessarily a physical device, and may be a virtualized network element or other entity or network element.
  • the element can be determined according to the actual application scenario.
  • the mobility management network element, the session management network element, and the user plane network element are not necessarily physical devices, and may be virtualized network elements or other entities or network elements.
  • the above names are only for convenience of description, and may be based on actual conditions. Application scenario determination.
  • FIG. 3 is a schematic flowchart of a communication method according to an embodiment of the present application.
  • the method includes:
  • Step 301 The access network element receives the tunnel information of the first session from the mobility management network element, where the tunnel information is the first user plane network element of the access network element and the downlink data of the terminal. Information between the tunnels.
  • Step 302 The access network element determines that the tunnel information is invalid, and sends first information to the session management network element, where the first information is used to indicate that the tunnel information is invalid.
  • Step 303 The session management network element receives the first information from the access network element.
  • Step 304 The session management network element selects, according to the first information, a second user plane network element that transmits data for the terminal.
  • the access network element determines whether the received tunnel information is valid, and after determining that the tunnel information is invalid, indicates to the session management network element that the tunnel information is invalid, so that the session management network element can determine the tunnel in time.
  • the information is invalid, so that the service of the terminal can be established in a timely and effective manner, and the service establishment failure caused by the establishment of the service according to the invalid tunnel information is avoided.
  • the terminal Before step 301, the terminal is in an idle state, or is in a non-idle state but the first session of the terminal is deactivated. Before the terminal is in the idle state, or the terminal is in the non-idle state but the first session of the terminal is deactivated, the network side indicates that the first user plane network element is the terminal service.
  • the first user plane network element may be an anchor user plane network element, such as UPF1 in FIG. 2, or a non-anchor user plane network element, such as UPF2.
  • the non-idle state may refer to a Connetion management-CONNECTED state.
  • the first user plane network element When the first user plane network element receives the downlink data of the terminal, if the terminal has moved out of the service area of the first user plane network element, the first user plane network element still notifies the session management network element that it receives the terminal. Downstream data, then the session management network element sends session management information to the connected mobility management network element. Before the session management information is sent, the session management network element may determine that the user plane network element corresponding to the saved tunnel information of the first session is the first user plane network element, so that session management information including the tunnel information is sent to the connection. The mobility management network element of the session management network element.
  • the tunnel information may refer to CN N3 Tunnel Info (Core Network N3 Tunnel Info), that is, core network N3 tunnel information, and (R) AN Tunnel Info, that is, access network NE tunnel information.
  • the CN N3 Tunnel Info and the (R)AN Tunnel Info are information on both ends of the connection between the core network and the access network; correspondingly, the session management information may refer to information such as N2 Session Management information.
  • the message that includes the tunnel information of the first session received by the access network element may be an N2 SM message.
  • the first session is a session between the access network element and the first user plane network element.
  • the access network element may determine that the tunnel information is invalid if it is determined that the first user plane network element corresponding to the tunnel information cannot be connected. Correspondingly, if the access network element determines that the first user plane network element corresponding to the tunnel information can be connected, the tunnel information may be determined to be valid.
  • the access network element may be configured to compare the IP address of the first user plane network element carried in the tunnel information in the IP address list of the user plane network element that is connected to the access network element. If the IP address list includes the IP address of the first user plane network element, it can be determined that the first user plane network element can be connected. If the IP address list does not include the IP address of the first user plane network element, It can be determined that the first user plane network element cannot be connected.
  • the access network element may further determine whether the first user plane network element corresponding to the tunnel information may be connected, and details are not described herein again.
  • the first information indicating that the tunnel information is invalid may be sent to the mobility management network element.
  • the access network element may send the first information to the mobility management network element by using a response message established by the terminal context.
  • the mobility management network element may forward the first information to the session management network element.
  • the mobility management network element sends an N11 message including the received response message of the terminal context establishment to the session management network element, so as to implement forwarding the first information to the session management network element.
  • the first information includes an identifier and a cause value of the first session, where the first session is associated with the tunnel, and the cause value is used to indicate that the tunnel information is invalid.
  • the cause value may be used to indicate that the tunnel information is invalid.
  • the invalid reason may be that the access network element cannot be connected to the first user plane network element corresponding to the tunnel information, and the invalid reason is determined according to the actual situation, and details are not described herein again.
  • the access network element can directly complete the data radio bearers (DRB) channel between the terminal and the access network element. Establish and other operations.
  • DRB data radio bearers
  • the first information sent by the network element of the access network received by the session management network element is forwarded by the mobility management network element.
  • the session management network element determines, according to the first information, that the tunnel information of the first session of the terminal is invalid, and then reselects the second user plane network element that is the terminal service.
  • the session management network element may determine the second user plane network element according to the location information of the terminal, and the location information of the terminal may be obtained by using a service request (SR) message sent by the terminal in the process of paging the terminal, or may be obtained by other means. Obtained, it is not limited here.
  • SR service request
  • a session is established with the second user plane network element, and a new tunnel is established.
  • a forwarding tunnel for buffering data is also established.
  • the session management network element can interact with the second user plane network element to establish a new tunnel, and establish a A forwarding tunnel of cached data between a user plane network element and a second user plane network element.
  • the session management network element interacts with the anchor user plane network element to perform session modification, and connects the data channel between the anchor user plane network element and the second user plane network element.
  • the session management network element interacts with the first user plane network element to establish a forwarding tunnel for the cached data between the first user plane network element and the second user plane network element.
  • the forwarding tunnel between the first user plane network element and the second user plane network element is established, and the downlink data buffered in the terminal of the first user plane network element can be forwarded to the second user plane network element. And further transmitting the buffered downlink data to the terminal by using an access network element connected to the second user plane network element.
  • the new tunnel is a tunnel between the second user plane network element and the access network element.
  • the modified session is a session between the access device network element and the second user plane network element.
  • the first user plane network element forwards the received downlink data to the second user plane network element through the forwarding tunnel, and after the first user plane network element completes the buffer data forwarding processing, the session management network element follows The second user plane network element interacts to delete the forwarding tunnel, and the session management network element interacts with the first user plane network element to delete the forwarding tunnel and the first session.
  • the session management network element interacts with the second user plane network element to establish a new tunnel; the session management network element interacts with the first user plane network element to perform session modification, and connects a data channel between the first user plane network element and the second user plane network element, for transmitting the cache data from the data channel. And downlink data to the terminal.
  • the session management network element After the session management network element establishes a new tunnel, the N2 SM information of the tunnel information carrying the new tunnel is reconstructed, and then the N2 SM information is sent to the mobility management network element, and the mobility management network element transparently transmits the tunnel information of the new tunnel. It is transmitted to the access network element, and the establishment of the DRB channel is completed by the access network element.
  • the terminal can perform uplink data transmission through the second user plane network element.
  • the access network element After receiving the tunnel information of the new tunnel and determining that the user plane connection is activated, the access network element notifies the session management network element of the access network element tunnel information (RAN Tunnel Information) of the session by the mobility management network element.
  • RAN Tunnel Information access network element tunnel information
  • the access network element tunnel information is the tunnel information of the access network side, and the tunnel information carried by the N2 SM information sent by the session management network element to the access network is the core network N3 tunnel information, and the forwarding tunnel is forwarded.
  • the access network element tunnel information has a correspondence with the tunnel information carried by the N2 SM information sent by the session management network element to the access network, that is, the access network element tunnel information
  • the tunnel included in the tunnel and the core network N3 tunnel information are both ends of the connection between the core network and the access network.
  • the session management network element interacts with the second user plane network element to perform session modification, and notifies the access network network element tunnel information of the second user plane network element downlink data channel.
  • the session management network element sends an acknowledgement message to the mobility management network element, and the service establishment process of the terminal is completed, and the terminal and the network side can transmit data to each other.
  • FIG. 4 is a schematic flowchart diagram of a communication method according to an embodiment of the present application.
  • the access network element is the RAN
  • the mobility management network element is the AMF
  • the session management network element is the SMF
  • the user plane network element is the UPF as an example.
  • the anchor user plane network element is UPF1
  • the first user plane network element is UPF2
  • the second user plane network element is UPF3
  • the first user plane network element and the second user plane network element are non-anchor users.
  • the network element that is, the downlink data sent by the network to the terminal is forwarded to UPF2 or UPF3 through UPF1.
  • the uplink data received by UPF2 or UPF3 is forwarded to the DN through UPF1.
  • Step 401 UPF1 forwards the downlink data of the received terminal to UPF2.
  • Step 402 The UPF2 buffers the received downlink data.
  • Step 403 The UPF2 sends a data notification message to the SMF to notify the SMF that the downlink data of the terminal has been received.
  • Step 404 The SMF returns a data notification confirmation message to the UPF 2.
  • Step 405 The SMF determines the tunnel information of the first session of the terminal, and sends an N11 message to the AMF, requesting the AMF to forward the N2 SM message, where the N11 message includes the session identifier of the first session, session management information, and the like. Information, wherein the tunnel information is included in the session management information.
  • the UPF corresponding to the tunnel information determined by the SMF is UPF2.
  • a paging procedure needs to be initiated in step 406.
  • the AMF does not need to initiate paging, then go to step 409.
  • Step 406 The AMF sends a paging message to the RAN.
  • Step 407 The RAN sends a paging message to the terminal.
  • Step 408 After receiving the paging message, the terminal sends a paging response message to the AMF through the RAN, triggering a service establishment process.
  • Step 409 The AMF sends an N2 message including the tunnel information to the RAN.
  • Step 410 The RAN determines whether the tunnel information is valid. If it is determined that the tunnel information is valid, the process goes to step 419. If it is determined that the tunnel information is invalid, then the process goes to step 411.
  • the RAN may refer to the foregoing description, and details are not described herein again.
  • Step 411 The RAN sends an N2 response message to the AMF, where the N2 response message includes first information, where the first information is used to indicate that the tunnel information of the first session is invalid.
  • the first information may include an identifier of the first session and a cause value of invalid tunnel information.
  • Step 412 The AMF sends an N11 message including the N2 response message to the SMF.
  • Step 413 After the SMF learns that the tunnel information is invalid by using the first information, if the SMF has determined that the UPF is the UPF of the terminal service according to the latest location information, step 417 is performed, otherwise the UPF determined as the terminal service is determined again. UPF is UPF3.
  • Step 414 The SMF interacts with the UPF3, establishes a new tunnel between the terminal and the UPF3, and establishes a forwarding tunnel for the cached data between the UPF2 and the UPF3.
  • the new tunnel refers to the tunnel between UPF3 and RAN.
  • Step 415 The SMF interacts with the UPF1 to perform session modification, and the connection of the first session between the UPF1 and the UPF2 is changed to the connection between the UPF1 and the UPF3.
  • Step 416 The SMF interacts with the UPF2 to establish a forwarding tunnel for the cached data between the UPF2 and the UPF3.
  • Step 417 The SMF reconstructs the N2 SM information, which carries the tunnel information of the new tunnel, and then sends the information to the AMF.
  • Step 418 The AMF forwards the N2 SM information to the RAN, where the tunnel information of the new tunnel is included.
  • Step 419 Perform radio resource control (RRC) connection reconfiguration between the RAN and the terminal, and establish a DRB (Data Radio Bearer, a wireless connection for data transmission for data transmission).
  • RRC radio resource control
  • Step 420 The terminal can start the transmission of the uplink data here.
  • Step 421 The RAN sends a request response message to the AMF, where the RAN tunnel information is included.
  • Step 422 The AMF forwards the RAN tunnel information to the SMF.
  • Step 423 The SMF interacts with the UPF3 to perform session modification, and notifies the RAN tunnel information of the UPF3 downlink data channel.
  • Step 424 The UPF2 forwards the downlink data of the cached terminal to the UPF3 through the forwarding tunnel.
  • Step 425 UPF3 forwards the downlink data to the terminal.
  • Step 426 The SMF interacts with the UPF3 to delete the forwarding tunnel.
  • Step 427 The SMF interacts with the UPF2 to delete the forwarding tunnel.
  • Step 428 The SMF sends an N11 confirmation message to the AMF, and the service establishment process is completed.
  • Step 429 The UPF3 forwards the received downlink data to the terminal.
  • the UPF2 may also be an anchor UPF.
  • the SMF does not need to complete the forwarding tunnel between the UPF2 and the UPF3 for the session, that is, the establishment of the forwarding tunnel, the forwarding of the cache data, and the deletion of the forwarding in the process. Tunnels, other processes are similar, and will not be described here.
  • the establishment of the DRB on the RAN side may be advanced, that is, after the RAN determines that the tunnel is invalid, the DRB is first established, and the RAN Tunnel Info is carried in the N2 SM response message sent to the SMF through the AMF, and the SMF obtains the new CN N3 Tunnel. , notify the RAN to update the CN N3 Tunnel interface.
  • the processing of the non-anchor user plane network element that is, the processing of the forwarding tunnel processing is similar to that of the case where the UPF2 and the UPF3 are similar, and details are not described herein again.
  • the mobility management network element may determine whether to update the session management information sent by the session management network element, which is described in detail below.
  • FIG. 5 is a schematic flowchart of a communication method according to an embodiment of the present application.
  • the method includes:
  • Step 501 The session management network element sends session management information and location area information to the mobility management network element.
  • the location area indicated by the location area information may be a service area of the user plane network element that receives the downlink data of the terminal.
  • the session management information includes, but is not limited to, N2 SM information, and the session management information includes tunnel information.
  • Step 502 The mobility management network element receives session management information and location area information from the session management network element, and determines location information of the terminal.
  • Step 503 The mobility management network element determines, according to the location area information and the location information, that the terminal is located outside the service area indicated by the location area information, and indicates the session management information to the session management network element. Not being forwarded, and triggering the session management network element to update the session management information.
  • Step 504 The session management network element learns from the mobility management network element that the session management information is not forwarded, where the session management information is not forwarded, and the location area information and the location information of the terminal are associated; The session management network element updates the session management information.
  • the mobility management network element when the mobility management network element determines that the terminal is located outside the service area indicated by the location area information according to the location area information and the location information, the mobility management network element may indicate the session management to the session management network element.
  • the information is not forwarded, and the session management network element is triggered to update the session management information, so that the service of the terminal can be established in a timely and effective manner, and the service establishment failure of the terminal due to the service area of other user plane network elements is avoided.
  • the terminal Before step 501, the terminal may be in an idle state, or in a non-idle state but the first session of the terminal is deactivated.
  • the first session is a session between the access network element and the first user plane network element.
  • the network side indicates that the first user plane network element is the terminal service.
  • the first user plane network element may be an anchor user plane network element, or may be a non-anchor user plane network element. This is not limited in this embodiment; the non-idle state may refer to a connection management connection state.
  • the session management network element may determine that the user plane network element corresponding to the saved tunnel information of the first session is the first user plane network element, so that session management information including the tunnel information is sent to the session management. Mobility management network element.
  • the session management network element sends a request message to the mobility management network element, where the request message is used to request the mobility management to forward the N2 SM message.
  • the request message includes a session identifier of the first session, location area information, session management information, and the like, wherein the session management information includes the tunnel information.
  • the first user plane network element is a user plane network element that provides an N3 connection for the first session.
  • the service area information of the service area of the first user plane network element may be a TAI list of the RAN that the first user plane network element can connect to, or the location area information may also be indicated by an agreed identification information, so as to be reduced. Signaling overhead on the interface.
  • the mobility management network element completes the paging of the terminal through the network element of the access network.
  • the mobility management network element may obtain the location information of the terminal by using the SR message sent by the terminal during the paging process.
  • the mobility management network element can also determine the location information of the terminal by other means, and will not be exemplified one by one.
  • step 503 if the mobility management network element determines that the terminal is located outside the location area indicated by the location area information according to the location information of the terminal, it may be determined that the tunnel information is invalid, otherwise the tunnel may be determined. The information is valid.
  • the first message may be sent to the session management network element, so that the first message indicates that the session management information is not forwarded or the session management information needs to be updated, and further
  • the session management network element may be triggered to update the session management information, and the specific implementation is not limited.
  • the mobility management network element may not forward the session management information to the RAN, or forward the session management information to the RAN, but finally determine that the forwarding fails, the mobility management network The element may then send information to the session management network element indicating that the session management information is not forwarded or the session management information needs to be updated, and the information may be an execution result or a cause value.
  • the information can be located in the first message.
  • the first message may also be the current location information of the terminal.
  • the current location information of the terminal may be carried in the first message or may be carried in the independent subscription report information.
  • the first message carries the current location information of the terminal, and may carry the location information in the first message sent by the mobile management device directly, or may determine, by the mobility management device, the session management network element to subscribe to the location information of the terminal.
  • the location report information is sent at the same time as the first message is sent.
  • the mobility management network element determines that the tunnel information is valid, the following process is performed according to the prior art. For example, the mobility management network element sends the tunnel information to the access network element.
  • step 504 after the session management network element receives the first message, if it is determined that the session management information is not forwarded according to the first message or the session management information needs to be updated, the session management information may be reconstructed, thereby obtaining the updated Session management information, the updated session management information including information of a second user plane network element that transmits data for the terminal.
  • the selection of the second user plane network element is determined according to information about the current location information of the terminal and the data network (DN) accessed by the session, and the second user plane network element may be selected by the session management network element.
  • the session management network element may be completed after receiving the independent location information report.
  • the session management network element may determine the user plane network element that covers the location information of the terminal in the service area as the second user plane network element, and may further determine the second user plane network element according to other manners, and details are not described herein again.
  • the session management network element may also interact with the first user plane network element to perform session modification, connect the data channel between the first user plane network element and the second user plane network element, or establish the first user plane network element and the first
  • the forwarding tunnel between the two user plane network elements is configured to transmit the buffered downlink data from the first user plane network element to the second user plane network element, and then transmit the data to the terminal.
  • the session management network element may send the tunnel information of the new tunnel to the mobility management network element, and the mobility management network element transparently transmits the tunnel information of the new tunnel to the access network element, and completes the DRB by the access network element.
  • the establishment of the channel may send the tunnel information of the new tunnel to the mobility management network element, and the mobility management network element transparently transmits the tunnel information of the new tunnel to the access network element, and completes the DRB by the access network element.
  • the terminal can perform uplink data transmission through the second user plane network element.
  • the access network element After receiving the tunnel information of the new tunnel and determining that the user plane connection is activated, the access network element notifies the session management network element of the access network element tunnel information of the session by the mobility management network element.
  • the session management network element interacts with the second user plane network element to perform session modification, and notifies the access network network element tunnel information of the second user plane network element downlink data channel.
  • the first user plane network element forwards the received downlink data to the second user plane network element through the forwarding tunnel.
  • the session management network element interacts with the second user plane network element to delete the forwarding tunnel, and the session management network element interacts with the first user plane network element to delete the forwarding tunnel and the first session. .
  • the session management network element sends an acknowledgement message to the mobility management network element, and the service establishment process of the terminal is completed, and the terminal and the network side can transmit data to each other.
  • FIG. 6 is a schematic flowchart diagram of a communication method according to an embodiment of the present application.
  • the access network element is the RAN
  • the mobility management network element is the AMF
  • the session management network element is the SMF
  • the user plane network element is the UPF as an example.
  • the first user plane network element is UPF1, which is the anchor user plane network element of the first session
  • the second user plane network element is UPF2, which is the non-anchor user plane network element of the first session.
  • Step 601 The UPF1 buffers the downlink data of the received terminal.
  • Step 602 The UPF1 sends a data notification message to the SMF to notify the SMF that the downlink data of the terminal has been received.
  • Step 603 The SMF returns a data notification confirmation message to the UPF1.
  • Step 604 The SMF determines the tunnel information of the first session of the terminal, and sends an N11 message to the AMF to request the AMF to forward the N2 SM message, where the N11 message includes the session identifier of the first session, the service area information, Information such as session management information, wherein the tunnel management information includes the tunnel information.
  • the UPF corresponding to the tunnel information determined by the SMF is UPF1.
  • Step 605 The AMF sends a paging message to the RAN.
  • the AMF does not need to initiate paging, then go to step 608.
  • Step 606 The RAN sends a paging message to the terminal.
  • Step 607 After receiving the paging message, the terminal sends a service response message to the AMF through the RAN, triggering a service establishment process.
  • Step 608 The AMF determines whether the tunnel information is valid. If it is determined that the tunnel information is valid, then go to step 614; if it is determined that the tunnel information is invalid, go to step 609.
  • Step 609 The AMF sends a first message to the SMF.
  • the location information may be carried in the first message.
  • the SMF may subscribe to the location information of the UE to the AMF, and the AMF simultaneously carries the location information when the first message is sent to the SMF.
  • the first message is a response message returned by the AMF to the SMF, and the location information is implemented by an independent subscription escalation.
  • the first message further includes a forwarding result of the N2 SM information, where the session management information is not forwarded or the session management information needs to be updated.
  • Step 610 After the SMF learns the N2 SM information forwarding result according to the first message, if the SMF has determined that the UPF is the UPF of the terminal service according to the latest location information, step 613 is performed, otherwise, the UPF of the terminal service is re-determined, and then the determining is performed.
  • the UPF is UPF2.
  • Step 611 The SMF interacts with the UPF2 to establish a new tunnel of the new session between the terminal and the UPF2.
  • the new tunnel refers to the tunnel connecting UPF2 and RAN.
  • Step 612 The SMF interacts with the UPF1 to perform session modification and connects the data channel between the UPF1 and the UPF2.
  • Step 613 The SMF reconstructs the N2 SM information, where the N2 SM information includes the tunnel information of the new tunnel, and then the SMF sends the N2 SM information to the AMF.
  • Step 614 The AMF forwards the tunnel information of the new tunnel to the RAN.
  • Step 615 Perform Radio Resource Control (RRC) connection reconfiguration between the RAN and the terminal.
  • RRC Radio Resource Control
  • Step 616 The terminal can start the transmission of the uplink data here.
  • Step 617 The RAN sends a request response message to the AMF, including RAN tunnel information.
  • Step 618 The AMF sends an N11 message to the SMF, where the RAN tunnel information is included.
  • Step 619 The UPF1 forwards the downlink data of the cached terminal to the UPF2 through the data channel between the UPF1 and the UPF2.
  • Step 620 UPF2 forwards the downlink data to the terminal.
  • Step 621 The SMF sends an N11 confirmation message to the AMF, and the service establishment process is completed.
  • Step 622 The UPF2 forwards the received downlink data to the terminal.
  • the mobility management network element may also determine whether to update the session information sent by the session management network element, which is described in detail below.
  • FIG. 7 is a schematic flowchart of a communication method according to an embodiment of the present application.
  • the method includes:
  • Step 701 The session management network element sends the location area condition information and the session management information to the mobility management network element.
  • the location area condition information is used to indicate that the location of the terminal is in the location area, or the location area condition information includes a location area and a first condition, where the first condition is used to indicate the terminal The location is within the location area.
  • the session information includes core network tunnel information of the first session of the terminal.
  • Step 702 The mobility management network element receives location area condition information and session management information from the session management network element, and determines location information of the terminal.
  • the location area condition information is used to indicate that the location of the terminal is in the location area. .
  • the location area is used to indicate a service area of the first user plane network element that receives the downlink data of the terminal, where the location area information may also be an agreed-upon identifier, so that the session management network element may be reduced.
  • the session management network element invokes the N2 SM information forwarding service provided by the mobility management network element.
  • the location information including but not limited to the terminal is located in the service indicated by the service area information.
  • the first user plane network element herein refers to a user plane network element that provides an N3 connection for the first session.
  • the service area information of the service area of the first user plane network element may be a TAI list of the connection RAN that the first user plane network element can.
  • Step 703 If the mobility management network element determines that the location information of the terminal does not satisfy the location area condition information, send a first message to the session management network element, where the first message is used to trigger the session management network. Meta update session management information.
  • the mobility management network element may directly forward the session information to the access network element, and does not send the first message to the session management network element. In response to the message, there is no need to update the N2 SM information.
  • the session management information is N2 SM information including core network tunnel information
  • the session management network element requests the mobility management network element to forward the information to the access network.
  • the mobility management network element determines that the service area information and the location information meet the condition information, the mobility management network element sends the first message, and thus does not need to update the N2 SM information, but Directly forward session management information to the access network.
  • Step 704 The session management network element receives the mobility management network element to send a first message, and determines updated session management information, where the updated session management information includes a second user plane for transmitting data to the terminal. Tunnel information of the NE.
  • the first message is sent after the mobility management network element determines that the location information does not satisfy the location area condition information.
  • the mobility management network element determines that the location information of the terminal does not satisfy the location area condition information
  • the mobility management network element sends a first message for triggering the session management network element to update the session management information to the session management network element, so that the terminal can be guaranteed.
  • the service can be established in a timely and effective manner, and the service establishment failure of the terminal due to the service area of other user plane network elements is avoided.
  • step 701 to step 704 can be referred to the description in step 501 to step 504, and details are not described herein again.
  • FIG. 8 it is a schematic flowchart of a communication method provided by an embodiment of the present application.
  • the access network element is the RAN
  • the mobility management network element is the AMF
  • the session management network element is the SMF
  • the user plane network element is the UPF as an example.
  • the first user plane network element is UPF1, which is the anchor user plane network element of the first session
  • the second user plane network element is UPF2, which is the non-anchor user plane network element of the first session.
  • Step 801 UPF1 buffers the downlink data of the received terminal.
  • Step 802 The UPF1 sends a data notification message to the SMF to notify the SMF that the downlink data of the terminal has been received.
  • Step 803 The SMF returns a data notification confirmation message to the UPF1.
  • Step 804 The SMF determines the core network tunnel information of the first session of the terminal, and sends an N11 message to the AMF to request the AMF to forward the N2 SM message, where the N11 message includes location area condition information and session management information.
  • N2 SM information information such as a session identifier of the first session, wherein the session information includes the tunnel information.
  • Step 805 The AMF sends a paging message to the RAN.
  • the AMF does not need to initiate paging, then go to step 808.
  • Step 806 The RAN sends a paging message to the terminal.
  • Step 807 After receiving the paging message, the terminal sends a service response message to the AMF through the RAN, triggering a service establishment process.
  • Step 808 The AMF determines that the location information of the terminal satisfies the location area condition information. If the terminal is in the location area, the tunnel information may be determined to be valid, so that the tunnel information may be directly forwarded to the access network element. Otherwise, go to step 809.
  • Step 809 The AMF sends a first message including the location information to the SMF, where the first message triggers the SMF to update the session management information.
  • the first message may carry the result of forwarding the N2 SM information and the location information.
  • the SMF may subscribe to the location information of the UE to the AMF, and the AMF simultaneously carries the location information when the first message is sent to the SMF.
  • the first message is a response message sent by the AMF to the SMF, where the first message carries the result of forwarding the N2 SM information, and the result is not forwarded or needs to be updated, and the location information is not carried by the first message, but Implemented through independent subscription escalation.
  • Step 810 After receiving the first message, the SMF reconstructs the N2 SM information, including the UPF serving the terminal at the current location, to implement the update of the session management information, and the UPF of the terminal service is UPF2.
  • the session management network element may also determine whether the tunnel information is valid, which is described in detail below.
  • FIG. 9 is a schematic flowchart of a communication method according to an embodiment of the present application.
  • the method includes:
  • Step 901 The session management network element acquires location information of the terminal.
  • Step 902 The session management network element determines, according to the location information, that the terminal is located outside the service area of the user plane network element corresponding to the first session of the terminal, and determines that the terminal is the terminal according to the location information of the terminal.
  • the second user plane network element that transmits data.
  • the session management network element determines that the terminal is located outside the service area of the user plane network element corresponding to the first session of the terminal, and may determine that the session information is received.
  • the tunnel information is invalid, so that the second user plane network element that transmits the data for the terminal is re-determined according to the location information of the terminal, so as to ensure that the service of the terminal can be established in a timely and effective manner, and the terminal is prevented from being located in the service area of other user plane network elements.
  • the terminal may be in an idle state, or in a non-idle state but the first session of the terminal is deactivated.
  • the first user plane network element may be an anchor user plane network element, or may be a non-anchor user plane network element, which is not limited in this embodiment of the present application.
  • the session management network element determines that the first user plane network element receives the downlink data of the terminal, the first tunnel information corresponding to the first session of the terminal that is previously saved may be obtained.
  • the session management network element may send a first message requesting location information of the terminal to the mobility management network element, thereby obtaining location information of the terminal.
  • the session management network element after receiving the downlink data notification message sent by the first user plane network element, the session management network element sends a first message requesting the location information of the terminal to the mobility management network element.
  • the mobility management network element may determine location information of the terminal according to the state of the terminal. Specifically, if the mobility management network element determines that the terminal is in the connected state, the location information of the terminal may be directly obtained; or the mobility management network element determines that the terminal is in an idle state, and may pass the paging station. The terminal acquires location information of the terminal. The mobility management network element can then send the location information to the session management network element.
  • the first message may also be a new interactive message, where the message carries the identifier of the terminal. If it is under the service architecture, the session management network element is required to call a new service for obtaining the location of the terminal.
  • the first message may be a session information forwarding message that does not carry the tunnel information. If it is in the service architecture, the session management network element may also invoke the AMF to forward the N2 SM information.
  • step 902 if the session management network element determines that the terminal is outside the service area of the user plane network element that receives the downlink data of the terminal, the terminal may determine that the terminal is located at the first end of the terminal.
  • the session area of the first user plane network element corresponding to the session is outside, and the tunnel information is determined to be invalid. Otherwise, the tunnel information may be determined to be valid.
  • the session management network element determines that the tunnel information is valid, the following process is performed according to the prior art, for example, the session management information including the core network tunnel information is forwarded to the access network by using the mobility management device.
  • the session management network element may also interact with the first user plane network element to perform session modification, and connect the data channel between the first user plane network element and the second user plane network element, or
  • the forwarding tunnel between the first user plane network element and the second user plane network element is configured to transmit the buffered downlink data from the first user plane network element to the second user plane network element, and then transmit the data to the terminal.
  • the session management network element may further acquire at least one of a mobile attribute and a location information of the terminal; and then, the session management network element is configured according to at least one of the mobile attribute and the location information. Determining that the terminal is located outside the service area of the user plane network element corresponding to the first session of the terminal, and determining, according to the location information of the terminal, the second user plane network element that transmits data for the terminal.
  • the mobility attribute of the terminal acquired by the session management network element may be included in a mobility pattern or an independent mobility attribute parameter, and the session management network element may pass the first session establishment/modification/release process.
  • the session management network element may pass the first session establishment/modification/release process.
  • the session management network element may obtain location information of the terminal from the AMF in the session establishment/modification/release process, or subscribe to the location information of the terminal from the AMF. In this implementation manner, the specific acquisition process of the location information is not described here.
  • the session management network element determines that the terminal is located outside the service area of the first user plane network element corresponding to the first session of the terminal according to the obtained different parameters, which are respectively described below.
  • the session management network element obtains the mobile attribute of the terminal.
  • the session management network element determines that the terminal is a high mobility terminal according to the mobility attribute, it may be determined that the terminal is located outside a service area of the first user plane network element corresponding to the first session of the terminal, And determining that the tunnel information is invalid, the first tunnel information is information about a tunnel between the first user plane network element and the access network network element corresponding to the first session; and correspondingly, the session management network element is according to the The mobile attribute determines that the terminal is a low mobility terminal, and then determines that the tunnel information is valid.
  • the high mobility terminal may refer to a terminal whose moving speed is greater than a threshold
  • the low mobility terminal may refer to a terminal whose moving speed is less than or equal to a threshold
  • the session management network element obtains the location information of the terminal.
  • the session management network element determines, according to the location information, that the terminal moves out of the service area of the user plane network element that receives the downlink data of the terminal, the tunnel information may be determined to be invalid, otherwise the The terminal is located outside the service area of the first user plane network element corresponding to the first session of the terminal, and determines that the tunnel information is valid.
  • the session management network element obtains the mobile attribute and location information of the terminal.
  • the session management network element determines that the terminal is a low mobility terminal according to the mobility attribute, and determines, according to the location information, a service area of the user plane network element that receives the downlink data of the terminal according to the location information.
  • the terminal may be determined to be outside the service area of the first user plane network element corresponding to the first session of the terminal, and determine that the tunnel information is invalid. Otherwise, the tunnel information may be determined to be valid.
  • the session management network element may send a first message that does not carry the tunnel information to the mobility management network element, and request the current location information of the terminal, and obtain the information according to the request.
  • the current location information of the terminal is determined as the second user plane network element for transmitting data by the terminal.
  • the session management network element may determine, as the second user plane network element, the user plane network element that covers the current location information of the terminal in the service area.
  • the second user plane network element may be determined according to other manners, and details are not described herein again.
  • the current location information requested by the session management network element is the latest location information, so that the second user plane network element can be accurately determined for the terminal, and the process of determining the second user plane network element is specifically referred to the prior art. Narration.
  • the mobility management network element may obtain the current location information of the terminal, and then send the current location information of the terminal to the session management network element, if it is determined that the tunnel information is not carried in the first message. If the mobility management network element determines that the first message carries the tunnel information, the mobility information may directly forward the tunnel information to the access network element.
  • the first message may be a new interactive message, where the message carries the identifier of the terminal. If it is in the service architecture, it is necessary to call the session management network element a new service for obtaining the location of the terminal.
  • the session management network element determines that the terminal is located outside the service area of the user plane network element corresponding to the first session of the terminal according to the at least one of the mobility attribute and the location information, other actions of the session management network element may be referred to.
  • the description in step 902 will not be repeated here.
  • FIG. 10 it is a schematic flowchart of a communication method provided by an embodiment of the present application.
  • the access network element is the RAN
  • the mobility management network element is the AMF
  • the session management network element is the SMF
  • the user plane network element is the UPF as an example.
  • the process shown in FIG. 10 can be used. The description in the description will not be repeated here.
  • the first user plane network element is UPF1, which is the anchor user plane network element of the first session
  • the second user plane network element is UPF2, which is the non-anchor user plane network element of the first session.
  • Step 1001 UPF1 buffers the downlink data of the received terminal.
  • Step 1002 The UPF1 sends a data notification message to the SMF to notify the SMF that the downlink data of the terminal has been received.
  • Step 1003 The SMF returns a data notification confirmation message to the UPF1.
  • Step 1004 The SMF sends a first message to the AMF for requesting location information of the terminal.
  • Step 1005 The AMF sends a paging message to the terminal through the RAN.
  • Step 1006 After receiving the paging message, the terminal sends a service response message to the AMF through the RAN, triggering a service establishment process.
  • Step 1007 The AMF determines location information of the terminal according to the status of the terminal.
  • Step 1008 The AMF sends the location information of the terminal to the SMF.
  • Step 1009 The SMF determines, according to the location information, whether the location of the terminal is within the service area of the UPF1, and further determines whether the tunnel information of the first session is valid. If yes, go to step 1012, otherwise, according to the location information.
  • the UPF of the terminal service is re-determined, and the process goes to step 1010, where the determined UPF is UPF2.
  • Step 1010 The SMF interacts with the UPF2 to establish a new tunnel for the new session between the terminal and the UPF2.
  • the new tunnel refers to the tunnel between UPF2 and RAN.
  • Step 1011 The SMF interacts with the UPF1 to perform session modification and connects the data channel between the UPF1 and the UPF2.
  • Step 1012 The SMF constructs N2 SM information, where if the location information determines that the location of the terminal is within the service area of the UPF1, the original core network original tunnel information is directly used to construct the N2 SM information, otherwise the new tunnel is used.
  • the core network tunnel information constructs the N2 SM information. Then, the SMF transmits the N2 SM information to the AMF.
  • Step 1013 The AMF forwards the tunnel information of the new tunnel to the RAN.
  • Step 1014 Perform RRC connection reconfiguration between the RAN and the terminal to establish a DRB.
  • Step 1015 The terminal can start the transmission of the uplink data here.
  • Step 1016 The RAN sends a request response message to the AMF, including RAN tunnel information.
  • Step 1017 The AMF sends an N11 message to the SMF, including RAN tunnel information.
  • Step 1018 UPF1 forwards the downlink data of the buffered terminal to the UPF2 through the data channel between the UPF1 and the UPF2.
  • Step 1019 UPF2 forwards the downlink data to the terminal.
  • Step 1020 The SMF sends an N11 confirmation message to the AMF, and the service establishment process is completed.
  • Step 1021 UPF2 forwards the received downlink data to the terminal.
  • both the UPF1 and the UPF2 are non-anchor user plane network elements of the first session, and when the UPF1 and the UPF2 transmit data for the terminal through the anchor user plane network element of the first session, the SMF needs to be a session.
  • the processing of the forwarding tunnel established between the UPF2 and the UPF3 is complete.
  • the other processes are similar and will not be described here.
  • FIG. 11 it is a schematic flowchart of a communication method provided by an embodiment of the present application.
  • the access network element is the RAN
  • the mobility management network element is the AMF
  • the session management network element is the SMF
  • the user plane network element is the UPF as an example.
  • the process shown in FIG. 11 can be used. The description in the description will not be repeated here.
  • the first user plane network element is UPF1, which is the anchor user plane network element of the first session
  • the second user plane network element is UPF2, which is the non-anchor user plane network element of the first session.
  • Step 1101 UPF1 buffers the downlink data of the received terminal.
  • Step 1102 The UPF1 sends a data notification message to the SMF to notify the SMF that the downlink data of the terminal has been received.
  • Step 1103 The SMF returns a data notification confirmation message to the UPF1.
  • Step 1104 At least one of the mobility attribute and the location information of the SMF terminal determines whether the terminal is in the service area of the UPF1, and further determines whether the tunnel information of the first session is valid. If valid, determining to send to the AMF includes the foregoing. The first message of the session management information of the tunnel information, otherwise determining to send the first message to the AMF that does not include the session management information of the tunnel information.
  • Step 1105 The SMF sends a first message to the AMF.
  • Step 1106 The AMF sends a paging message to the terminal through the RAN.
  • Step 1107 After receiving the paging message, the terminal sends a service response message to the AMF through the RAN, triggering a service establishment process.
  • Step 1108 The AMF determines whether it is necessary to send an N11 message to the SMF that triggers the paging.
  • step 1109 is performed.
  • Step 1109 The AMF sends an N11 message to the SMF, which is used to trigger the SMF to reconstruct the N2 SM information.
  • Step 1110 SMF, reconstructing the N2 SM information, including the UPF serving the terminal at the current location, and the UPF serving the terminal service is UPF2.
  • the UPF determined at this time is UPF2.
  • step 1110 can refer to the description in the step 1010 to the step 1021, and details are not described herein again.
  • the mobility management network element may also determine whether to forward the session information sent by the session management network element, which is described in detail below.
  • the method includes:
  • Step 1 The session management network element sends terminal state condition information and session management information to the mobility management network element.
  • the terminal status condition information is used to indicate that the status of the terminal is an idle state, or the terminal status and the first condition, where the first condition is used to indicate that the status of the terminal is an idle state.
  • the terminal status condition information may further include “N1 SM delivery can be skipped”.
  • the session information management information includes N1 SM information.
  • Step 2 The mobility management network element receives the terminal state condition information and the session management information from the session management network element, and determines the state of the terminal.
  • the terminal state condition information is used to indicate that the state of the terminal is an idle state.
  • the session management network element invokes the N1 SM information forwarding service provided by the mobility management network element.
  • the state of the terminal is the current state of the terminal.
  • Step 3 If the mobility management network element determines that the state of the terminal does not satisfy the terminal status condition information, the N1 SM information is not forwarded to the terminal, and the session is released by implicit synchronization for the N1 SM release information. Terminal.
  • the session management network element determines that the session is released in an appropriate manner, and provides a release avoidance service abnormality for the session that needs to maintain state synchronization, and releases the session by implicit synchronization for the session that does not need to maintain state synchronization. Terminal, saving system overhead.
  • FIG. 12 it is a schematic diagram of a session release process provided by an embodiment of the present application.
  • Step 1201 The terminal sends a Protocol Data Unit (PDU) session release request to the AMF.
  • PDU Protocol Data Unit
  • the request can be triggered by the terminal or the network side.
  • Step 1202 The AMF sends an N11 message including the PDU session release request to the SMF.
  • Step 1203 The SMF interacts with the PCF to perform session modification.
  • Step 1204 The SMF performs a session release trigger.
  • Step 1205 The SMF notifies the UPF to release the user plane path.
  • Step 1206 The SMF sends an N11 message to the AMF, where the N1 SM forwarding condition information, that is, the terminal status condition information, the N2 SM resource release request (Resource Release request), and the N1 SM information (Information) (that is, the PDU session release command (Session Release) Command)), triggering the release of resources on the RAN side, and the release of resources of the terminal.
  • the condition information is terminal status condition information.
  • the message of the N2 SM Release needs to be forwarded by the AMF, it can be judged on the SMF side.
  • the N2 SM message needs to be sent.
  • the inactive state session since the RAN side resource has been released, it is not The N2 SM message needs to be sent, and the state of the session is saved in the SMF, so the SMF can judge it by itself.
  • the terminal status condition information in the present application has the following situations:
  • the SMF may release the terminal-side resources of the session by means of implicit synchronization for the partial session of the terminal in the IDLE state, and may also carry indication information indicating that the N1 SM may not be forwarded, for example, "N1 SM delivery can be Skipped "Indication", the indication information may be independent or part of the condition information; that is, the terminal status condition information is: the terminal is in the IDLE state and receives indication information indicating that the N1 SM may not be forwarded.
  • the SMF can also unify all the sessions of the terminal in the IDLE state, and release the resources of the terminal of the session in a synchronous manner, and do not need to carry the indication information indicating that the N1 SM may not be forwarded, that is, the terminal status condition information is: For the IDLE state.
  • SMF can also unify all inactive sessions and release them through implicit synchronization. Then, the session context of releasing AMF and SMF and the binding relationship between them can be directly executed. SMF does not send N1 SM information. .
  • the SMF performs the forwarding service of the N1 SM message conditionally calling the AMF, that is, the input of the N1 message forwarding service provided by the AMF, that is, the input of the Namf_Communication_N1 MessageTransfer service operation, needs to increase the condition parameter here.
  • Step 1207 The AMF determines, according to the terminal status condition information, whether to forward and receive the N1 SM message, and if the AMF determines that the terminal is in the IDLE state:
  • the message received by the AMF carries the indication information indicating that the N1 SM may not be forwarded, and the step 1208 to the step 1209 are not forwarded, and the resource on the terminal side is released by the implicit synchronization. Go directly to step 1210.
  • step 1206 the AMF does not forward the skipping step 1208 to the step 1209, and releases the resources on the terminal side by means of implicit synchronization, and directly performs step 1210.
  • the AMF forwards the N1 SM message. If the terminal is in the IDLE state, the paging terminal is forwarded by the network to trigger the terminal to forward the N1 SM Information to the terminal. If the terminal is in the CM-CONNECTED state, the AMF directly forwards the received N1 SM Information message to the RAN.
  • the AMF performs the N1 SM message forwarding service according to the terminal status condition information input by the SMF, and executes when the terminal status condition information is satisfied, and does not execute if the condition is not satisfied, and returns the execution result after completion.
  • N2 SM Information message The processing of the N2 SM Information message is the same as that of the prior art, and no special processing is provided, and details are not described herein again.
  • Step 1208 The RAN releases the session-related resources, and forwards (N1 SM PDU Session Release Command) to the terminal to complete resource release on the terminal side.
  • Step 1209 After the RAN side resource release is completed, an N2 resource release confirmation message is returned, where the bearer release response may be transmitted together.
  • Step 1210 The AMF sends an N11 response message, where the N2 SM Resource Release Ack is carried.
  • Step 1211 The SMF sends an N11 message to the AMF to notify the AMF that the session release is complete.
  • AMF and SMF delete related session context information including binding relationship between AMF/SMF and the like.
  • Step 1212 Release the Protocol Data Unit Connectivity Access Network (PDU-CAN) session.
  • PDU-CAN Protocol Data Unit Connectivity Access Network
  • the SMF completes the processing decision of the session management information, and sends the condition of the N1 SM forwarding to the AMF.
  • the AMF specifies the forwarding service according to the forwarding condition set by the SMF.
  • the embodiment of the present application further provides a communication device.
  • FIG. 13 a schematic structural diagram of a communication apparatus is provided in an embodiment of the present application.
  • the communication device 1300 includes:
  • the transceiver unit 1301 is configured to receive, by the mobility management network element, tunnel information of the first session, where the tunnel information is between the access network element and the first user plane network element that receives the downlink data of the terminal. Tunnel information;
  • the processing unit 1302 is configured to determine that the tunnel information is invalid, and send first information to the session management network element, where the first information is used to indicate that the tunnel information is invalid.
  • processing unit 1302 is specifically configured to:
  • FIG. 14 a schematic structural diagram of a communication apparatus is provided in an embodiment of the present application.
  • the communication device 1400 includes:
  • the transceiver unit is configured to receive the first information from the access network element, where the first information is used to indicate that the tunnel information of the first session is invalid, and the tunnel information is the downlink of the access network element and the received terminal. Information about the tunnel between the first user plane network elements of the data;
  • the processing unit is configured to update the tunnel information of the first session after receiving the first information.
  • FIG. 15 a schematic structural diagram of a communication apparatus is provided in an embodiment of the present application.
  • the communication device 1500 includes:
  • the transceiver unit 1501 is configured to receive session management information and location area information from the session management network element, and determine location information of the terminal.
  • the processing unit 1502 is configured to determine, according to the location area information and the location information, that the terminal is located outside a service area indicated by the location area information;
  • the transceiver unit is configured to indicate to the session management network element that the session management information is not forwarded, and trigger the session management network element to update the session management information.
  • the transceiver unit is specifically configured to:
  • FIG. 16 a schematic structural diagram of a communication apparatus is provided in an embodiment of the present application.
  • the communication device 1600 includes:
  • the transceiver unit 1601 is configured to send session management information and location area information to the mobility management network element, and learn from the mobility management network element that the session management information is not forwarded, where the session management information is not forwarded. Associated with the location area information and the location information of the terminal;
  • the processing unit 1602 is configured to update the session management information.
  • the transceiver unit 1601 is specifically configured to:
  • the first message further includes the location information.
  • the location area information includes information about a service area of the first user plane network element that receives the downlink data of the terminal.
  • the updated session management information includes information about a second user plane network element that transmits data for the terminal.
  • FIG. 17 a schematic structural diagram of a communication device is provided in an embodiment of the present application.
  • the communication device 1700 includes:
  • the transceiver unit 1701 is configured to acquire location information of the terminal.
  • the processing unit 1702 is configured to determine, according to the location information type, that the terminal is located outside the service area of the user plane network element corresponding to the first session of the terminal, and determine, according to the location information of the terminal, that the terminal transmits data.
  • the second user plane network element is configured to determine, according to the location information type, that the terminal is located outside the service area of the user plane network element corresponding to the first session of the terminal, and determine, according to the location information of the terminal, that the terminal transmits data.
  • the transceiver unit 1701 is specifically configured to:
  • the session management network element After receiving the downlink data notification message, requesting, by the mobility management network element, location information of the terminal; the session management network element receiving location information of the terminal from the mobility management network element;
  • the processing unit 1702 is specifically configured to: determine, according to the location information received from the mobility management network element, that the terminal is located outside a service area of the first user plane network element corresponding to the first session of the terminal.
  • the transceiver unit 1701 is further configured to:
  • FIG. 18 a schematic structural diagram of a communication apparatus is provided in an embodiment of the present application.
  • the communication device 1800 includes:
  • the memory 1803 is configured to store computer instructions, and the processor 1801 is configured to read computer instructions in the memory 1803.
  • the transceiver 1802 is configured to receive tunnel information of the first session from the mobility management network element, where the tunnel information is between the access network element and the first user plane network element that receives the downlink data of the terminal. Tunnel information;
  • the processor 1801 is configured to determine that the tunnel information is invalid, and send first information to the session management network element, where the first information is used to indicate that the tunnel information is invalid.
  • the processor 1801 is specifically configured to:
  • FIG. 19 a schematic structural diagram of a communication apparatus is provided in an embodiment of the present application.
  • the communication device 1900 includes:
  • the memory 1903 is configured to store computer instructions, and the processor 1901 is configured to read computer instructions in the memory 1903.
  • the transceiver 1902 is configured to receive the first information from the access network element, where the first information is used to indicate that the tunnel information of the first session is invalid, and the tunnel information is the access network element and the received terminal.
  • the processor 1901 is configured to update tunnel information of the first session after receiving the first information.
  • FIG. 20 a schematic structural diagram of a communication device is provided in an embodiment of the present application.
  • the communication device 2000 includes:
  • the memory 2003 is configured to store computer instructions
  • the processor 2001 is configured to read computer instructions in the memory 2003.
  • the transceiver 2002 is configured to receive session management information and location area information from the session management network element, and determine location information of the terminal.
  • the processor 2001 is configured to determine, according to the location area information and the location information, that the terminal is located outside a service area indicated by the location area information;
  • the transceiver 2002 is configured to indicate to the session management network element that the session management information is not forwarded, and trigger the session management network element to update the session management information.
  • the transceiver is specifically configured to:
  • FIG. 21 a schematic structural diagram of a communication apparatus is provided in an embodiment of the present application.
  • the communication device 2100 includes:
  • the memory 2103 is configured to store computer instructions, and the processor 2101 is configured to read computer instructions in the memory 2103.
  • the transceiver 2102 is configured to send session management information and location area information to the mobility management network element.
  • the mobility management network element learns that the session management information is not forwarded, where the session management information is not forwarded.
  • the location area information and the location information of the terminal Associated with the location area information and the location information of the terminal;
  • the processor 2101 is configured to update the session management information.
  • the transceiver 2102 is specifically configured to:
  • the first message further includes the location information.
  • the location area information includes information about a service area of the first user plane network element that receives the downlink data of the terminal.
  • the updated session management information includes information about a second user plane network element that transmits data for the terminal.
  • FIG. 22 a schematic structural diagram of a communication apparatus is provided in an embodiment of the present application.
  • the communication device 2200 includes:
  • the memory 2203 is configured to store computer instructions, and the processor 2201 is configured to read computer instructions in the memory 2203.
  • the transceiver 2202 is configured to acquire location information of the terminal.
  • the processor 2201 is configured to determine, according to the location information type, that the terminal is located outside the service area of the user plane network element corresponding to the first session of the terminal, and determine, according to the location information of the terminal, that the terminal transmits data.
  • the second user plane network element is configured to determine, according to the location information type, that the terminal is located outside the service area of the user plane network element corresponding to the first session of the terminal, and determine, according to the location information of the terminal, that the terminal transmits data.
  • the transceiver 2202 is specifically configured to:
  • the session management network element After receiving the downlink data notification message, requesting, by the mobility management network element, location information of the terminal; the session management network element receiving location information of the terminal from the mobility management network element;
  • the processor 2201 is specifically configured to: determine, according to the location information received from the mobility management network element, that the terminal is located outside a service area of the first user plane network element corresponding to the first session of the terminal.
  • the transceiver 2202 is further configured to:
  • the embodiment of the present application further provides a computer readable storage medium for storing computer software instructions required to execute the foregoing processor, which includes a program for executing the above-mentioned processor.
  • embodiments of the present application can be provided as a method, system, or computer program product.
  • the present application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment in combination of software and hardware.
  • the application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, optical storage, etc.) including computer usable program code.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

Abstract

一种通信方法及装置，其中方法包括：接入网网元从移动性管理网元接收第一会话的隧道信息；所述隧道信息为所述接入网网元与接收到所述终端的下行数据的第一用户面网元之间隧道的信息；所述接入网网元确定所述隧道信息无效，向所述会话管理网元发送第一信息，所述第一信息用于指示所述隧道信息无效。

Description

一种通信方法及装置
本申请要求在2017年6月20日提交国家专利局、申请号为201710471836.3、发明名称为“一种通信方法及装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及信息技术领域，尤其涉及一种通信方法及装置。
背景技术
在长期演进(Long Term Evolution，LTE)系统中，移动性管理实体(Mobile Managenment Entity，MME)为终端分配的跟踪区列表(Tracking Area List，TAList)中的跟踪区标识(Tracking AreaIdentifier，TAI)属于同一个服务网关(Serving Gateway，SGW)的服务区域。对应的，在5G系统中，接入与移动性管理功能(Access and Mobility Management Function，AMF)实体为终端分配注册区列表。AMF实体为会话选择合适的会话管理功能(Session Management Function，SMF)实体，同时每个SMF实体与至少一个用户面功能(User Plane Function，UPF)对接。
当会话被去激活时，会话的无线接入网(radio access network,RAN)资源被释放，并且该会话的UPF与RAN之间的N3接口连接被释放，若终端已经移动出为终端服务的UPF的服务区域，在该UPF收到终端的初始下行数据时，网络侧须先在注册区范围内寻呼终端，然后为终端分配RAN资源，建立RAN侧的连接，并恢复UPF与无线接入网之间的N3接口连接。由于终端已经移动到其它UPF的服务区域，此时终端无法连接到为终端服务的UPF，从而无法接收到初始下行数据，导致初始下行数据发送失败，相关业务建立失败。
综上，如何在终端更换UPF的情况下，避免终端的下行数据发送失败，是亟待解决的问题。
发明内容
本申请提供一种通信方法及装置，用以解决如何在终端更换UPF的情况下，避免终端的下行数据发送失败的问题。
本申请实施例提供了一种通信方法，该方法包括：
本申请实施例提供了一种通信方法，该方法包括：
接入网网元从移动性管理网元接收第一会话的隧道信息；所述隧道信息为所述接入网网元与接收到所述终端的下行数据的第一用户面网元之间隧道的信息；
所述接入网网元确定所述隧道信息无效，向所述会话管理网元发送第一信息，所述第一信息用于指示所述隧道信息无效。
通过上述方法，接入网网元对接收到的隧道信息是否有效进行判断，并在确定隧道信息无效之后，向会话管理网元指示所述隧道信息无效，从而可以使得会话管理网元及时确定隧道信息无效，从而保证终端的业务能够及时有效的建立，避免根据失效的隧道信息建立业务导致的业务建立失败。
可选的，所述接入网网元确定所述隧道信息无效，包括：
所述接入网网元确定不能连接到所述隧道信息对应的所述第一用户面网元，则确定所述隧道信息无效。
本申请实施例提供了一种通信方法，所述方法包括：
会话管理网元从接入网网元接收第一信息，所述第一信息用于指示第一会话的隧道信息无效，所述隧道信息为所述接入网网元与接收到终端的下行数据的第一用户面网元之间隧道的信息；
所述会话管理网元收到所述第一信息后，更新所述第一会话的隧道信息。
通过上述方法，会话管理网元根据第一消息可以及时确定第一会话的隧道信息无效之后，从而可以避免根据失效的隧道信息建立业务导致的业务建立失败。
可选的，所述第一信息包括所述第一会话的标识和原因值，所述第一会话与所述隧道关联，所述原因值用于指示所述隧道信息无效。
本申请实施例提供了一种通信方法，所述方法包括：
移动性管理网元从会话管理网元接收会话管理信息以及位置区域信息，并确定终端的位置信息；
所述移动性管理网元根据所述位置区域信息以及所述位置信息确定所述终端位于所述位置区域信息指示的服务区域外，向所述会话管理网元指示所述会话管理信息未被转发，并触发所述会话管理网元更新所述会话管理信息。
通过上述方法，移动性管理网元根据所述位置区域信息以及所述位置信息确定所述终端位于所述位置区域信息指示的服务区域外时，可以向所述会话管理网元指示更新所述会话管理信息，从而能够保证终端的业务能够及时有效的建立，避免终端由于位于其它用户面网元的服务区域导致的业务建立失败。
可选的，所述移动性管理网元向所述会话管理网元指示所述会话管理信息未被转发，并触发所述会话管理网元更新所述会话管理信息，包括：
所述移动性管理网元向所述会话管理网元发送第一消息，所述第一消息指示所述会话管理信息未被转发，并触发所述会话管理网元更新所述会话管理信息。
本申请实施例提供了一种通信方法，所述方法包括：
会话管理网元向移动性管理网元发送会话管理信息以及位置区域信息；
所述会话管理网元从所述移动性管理网元获知：所述会话管理信息未被转发，其中，所述会话管理信息未被转发与所述位置区域信息和终端的位置信息关联；
所述会话管理网元更新所述会话管理信息。
通过上述方法，会话管理网元从移动性管理网元获知会话管理信息未被转发之后，可以更新所述会话管理信息，从而能够保证终端根据最新的会话管理信息建立业务，避免终端的业务建立失败。
可选的，所述会话管理网元从所述移动性管理网元获知：更新所述会话管理信息，包括：
所述会话管理网元从所述移动性管理网元接收第一消息，所述第一消息用于指示：更新所述会话管理信息。
可选的，所述第一消息还包括原因值，所述原因值用于指示所述会话管理信息未转发或所述会话管理信息需要更新。
可选的，所述第一消息还包括所述位置信息。
可选的，所述位置区域信息包括接收到所述终端的下行数据的第一用户面网元的服务区域的信息。
可选的，更新后的会话管理信息包括为所述终端传输数据的第二用户面网元的信息。
本申请实施例提供了一种通信方法，所述方法包括：
移动性管理网元从会话管理网元接收会话管理信息和条件信息，并确定终端的状态信息；
若所述移动性管理网元确定所述终端的状态信息满足所述条件信息，则转发所述会话管理信息。
通过上述方法，移动性管理网元确定终端的位置信息不满足位置区域条件信息时，向所述会话管理网元发送用于触发会话管理网元更新会话管理信息的第一消息，从而能够保证终端的业务能够及时有效的建立，避免终端由于位于其它用户面网元的服务区域导致的业务建立失败。
可选的，所述终端的状态信息为所述终端的位置信息，所述条件信息包括：位置区域信息。
可选的，所述终端的状态信息为所述终端的状态，所述条件信息包括：所述终端的状态为连接态。
可选的，还包括：
若所述移动性管理网元确定所述终端的状态信息不满足所述条件信息，所述移动性管理网元向所述会话管理网元指示：更新所述会话管理信息。
本申请实施例提供了一种通信方法，所述方法包括：
会话管理网元向移动性管理网元发送会话管理信息和条件信息，其中，所述会话管理信息的转发或更新与所述条件信息和终端的状态信息关联。
可选的，所述终端的状态信息为所述终端的位置信息，所述条件信息包括：位置区域信息。
可选的，所述终端的状态信息为所述终端的状态，所述条件信息包括：所述终端的状态为连接态。
可选的，还包括：
若所述移动性管理网元确定所述终端的状态信息不满足所述条件信息，所述移动性管理网元向所述会话管理网元指示：更新所述会话管理信息。
本申请实施例提供了一种通信方法，所述方法包括：
会话管理网元获取终端的位置信息；
所述会话管理网元根据所述位置信息种确定与所述终端位于所述终端的第一会话对应的用户面网元的服务区域外，根据所述终端的位置信息确定为所述终端传输数据的第二用户面网元。
通过上述方法，会话管理网元获取到中的位置信息之后，根据所述位置信息确定与所述终端位于所述终端的第一会话对应的用户面网元的服务区域外，则可以确定接收到的隧道信息无效，从而根据终端的位置信息重新确定为终端传输数据的第二用户面网元，从而保证终端的业务能够及时有效的建立，避免终端由于位于其它用户面网元的服务区域导致的业务建立失败。
可选的，会话管理网元获取终端的位置信息，包括：
所述会话管理网元收到下行数据通知消息后，向移动性管理网元请求所述终端的位置信息；所述会话管理网元从所述移动性管理网元接收所述终端的位置信息；
所述会话管理网元根据所述移动属性和位置信息中的至少一种确定所述终端位于所述终端的第一会话对应的第一用户面网元的服务区域外，包括：
所述会话管理网元根据从移动性管理网元接收到的位置信息确定所述终端位于所述终端的第一会话对应的第一用户面网元的服务区域外。
可选的，所述会话管理网元根据所述终端的位置信息确定为所述终端传输数据的第二用户面网元之后，所述方法还包括：
所述会话管理网元向移动性管理网元发送包含所述第二用户面网元对应的第二隧道信息的会话管理信息。
本申请实施例提供了一种通信方法，所述方法包括：
移动性管理网元从会话管理网元接收第一消息，所述第一消息不携带会话管理信息，所述第一消息用于请求终端的位置信息；
所述移动性管理网元收到包括所述位置信息的寻呼响应，并根据所述第一消息，向所述会话管理网元发送所述位置信息。
本申请实施例提供一种通信装置，所述装置包括：
收发单元，用于从移动性管理网元接收第一会话的隧道信息；所述隧道信息为所述接入网网元与接收到所述终端的下行数据的第一用户面网元之间隧道的信息；
处理单元，用于确定所述隧道信息无效，向所述会话管理网元发送第一信息，所述第一信息用于指示所述隧道信息无效。
可选的，所述处理单元具体用于：
确定不能连接到所述隧道信息对应的所述第一用户面网元，则确定所述隧道信息无效。
本申请实施例提供一种通信装置，所述装置包括：
收发单元，用于从接入网网元接收第一信息，所述第一信息用于指示第一会话的隧道信息无效，所述隧道信息为所述接入网网元与接收到终端的下行数据的第一用户面网元之间隧道的信息；
处理单元，用于收到所述第一信息后，更新所述第一会话的隧道信息。
可选的，所述第一信息包括所述第一会话的标识和原因值，所述第一会话与所述隧道关联，所述原因值用于指示所述隧道信息无效。
本申请实施例提供一种通信装置，所述装置包括：
收发单元，用于从会话管理网元接收会话管理信息以及位置区域信息，并确定终端的位置信息；
处理单元，用于备根据所述位置区域信息以及所述位置信息确定所述终端位于所述位置区域信息指示的服务区域外；
所述收发单元，用于向所述会话管理网元指示所述会话管理信息未被转发，并触发所述会话管理网元更新所述会话管理信息。
可选的，所述收发单元具体用于：
向所述会话管理网元发送第一消息，所述第一消息指示所述会话管理信息未被转发，并触发所述会话管理网元更新所述会话管理信息。
本申请实施例提供一种通信装置，所述装置包括：
收发单元，用于向移动性管理网元发送会话管理信息以及位置区域信息；从所述移动性管理网元获知：所述会话管理信息未被转发，其中，所述会话管理信息未被转发与所述位置区域信息和终端的位置信息关联；
处理单元，用于更新所述会话管理信息。
可选的，所述收发单元具体用于：
从所述移动性管理网元接收第一消息，所述第一消息用于指示：更新所述会话管理信息。
可选的，所述第一消息包括第一信息，所述第一信息用于指示所述会话管理信息未转发或所述会话管理信息需要更新。
可选的，所述第一消息还包括所述位置信息。
可选的，所述位置区域信息包括接收到所述终端的下行数据的第一用户面网元的服务区域的信息。
可选的，更新后的会话管理信息包括为所述终端传输数据的第二用户面网元的信息。
本申请实施例提供一种通信装置，所述装置包括：
收发单元，用于获取终端的位置信息；
处理单元，用于根据所述位置信息种确定与所述终端位于所述终端的第一会话对应的用户面网元的服务区域外，根据所述终端的位置信息确定为所述终端传输数据的第二用户面网元。
可选的，收发单元具体用于：
收到下行数据通知消息后，向移动性管理网元请求所述终端的位置信息；所述会话管理网元从所述移动性管理网元接收所述终端的位置信息；
处理单元具体用于：根据从移动性管理网元接收到的位置信息确定所述终端位于所述终端的第一会话对应的第一用户面网元的服务区域外。
可选的，所述收发单元还用于：
向移动性管理网元发送包含所述第二用户面网元对应的第二隧道信息的会话管理信息。
本申请实施例提供一种通信装置，所述装置包括：
收发器，用于从移动性管理网元接收第一会话的隧道信息；所述隧道信息为所述接入网网元与接收到所述终端的下行数据的第一用户面网元之间隧道的信息；
处理器，用于确定所述隧道信息无效，向所述会话管理网元发送第一信息，所述第一信息用于指示所述隧道信息无效。
可选的，所述处理器具体用于：
确定不能连接到所述隧道信息对应的所述第一用户面网元，则确定所述隧道信息无效。
本申请实施例提供一种通信装置，所述装置包括：
收发器，用于从接入网网元接收第一信息，所述第一信息用于指示第一会话的隧道信息无效，所述隧道信息为所述接入网网元与接收到终端的下行数据的第一用户面网元之间隧道的信息；
处理器，用于收到所述第一信息后，更新所述第一会话的隧道信息。
可选的，所述第一信息包括所述第一会话的标识和原因值，所述第一会话与所述隧道 关联，所述原因值用于指示所述隧道信息无效。
本申请实施例提供一种通信装置，所述装置包括：
收发器，用于从会话管理网元接收会话管理信息以及位置区域信息，并确定终端的位置信息；
处理器，用于备根据所述位置区域信息以及所述位置信息确定所述终端位于所述位置区域信息指示的服务区域外；
所述收发器，用于向所述会话管理网元指示所述会话管理信息未被转发，并触发所述会话管理网元更新所述会话管理信息。
可选的，所述收发器具体用于：
向所述会话管理网元发送第一消息，所述第一消息指示所述会话管理信息未被转发，并触发所述会话管理网元更新所述会话管理信息。
本申请实施例提供一种通信装置，所述装置包括：
收发器，用于向移动性管理网元发送会话管理信息以及位置区域信息；从所述移动性管理网元获知：所述会话管理信息未被转发，其中，所述会话管理信息未被转发与所述位置区域信息和终端的位置信息关联；
处理器，用于更新所述会话管理信息。
可选的，所述收发器具体用于：
从所述移动性管理网元接收第一消息，所述第一消息用于指示：更新所述会话管理信息。
可选的，所述第一消息包括第一信息，所述第一信息用于指示所述会话管理信息未转发或所述会话管理信息需要更新。
可选的，所述第一消息还包括所述位置信息。
可选的，所述位置区域信息包括接收到所述终端的下行数据的第一用户面网元的服务区域的信息。
可选的，更新后的会话管理信息包括为所述终端传输数据的第二用户面网元的信息。
本申请实施例提供一种通信装置，所述装置包括：
收发器，用于获取终端的位置信息；
处理器，用于根据所述位置信息种确定与所述终端位于所述终端的第一会话对应的用户面网元的服务区域外，根据所述终端的位置信息确定为所述终端传输数据的第二用户面网元。
可选的，收发器具体用于：
收到下行数据通知消息后，向移动性管理网元请求所述终端的位置信息；所述会话管理网元从所述移动性管理网元接收所述终端的位置信息；
处理器具体用于：根据从移动性管理网元接收到的位置信息确定所述终端位于所述终端的第一会话对应的第一用户面网元的服务区域外。
可选的，所述收发器还用于：
向移动性管理网元发送包含所述第二用户面网元对应的第二隧道信息的会话管理信息。
本申请实施例提供一种计算机存储介质，计算机存储介质中存储有指令，当其在计算机上运行时，使得计算机执行上述任意一种通信方式中的方法。
本申请实施例还提供了一种通信系统，该系统包括上述任意一种设计提供的通信装置，可选的，该系统还可以包括本申请实施例提供的方案中与所述通信装置进行交互的其他设备。
本申请实施例还提供了一种包含指令的计算机程序产品，当其在计算机上运行时，使得计算机执行上述各方面所述的方法。
附图说明
图1为一种可能的5G网络架构示意图；
图2为本申请实施例提供的一种通信方法流程示意图；
图3为本申请实施例提供的一种通信方法流程示意图；
图4为本申请实施例提供的一种通信方法流程示意图；
图5为本申请实施例提供的一种通信方法流程示意图；
图6为本申请实施例提供的一种通信方法流程示意图；
图7为本申请实施例提供的一种通信方法流程示意图；
图8为本申请实施例提供的一种通信方法流程示意图；
图9为本申请实施例提供的一种通信方法流程示意图；
图10为本申请实施例提供的一种通信方法流程示意图；
图11为本申请实施例提供的一种通信方法流程示意图；
图12为本申请实施例提供的一种通信方法流程示意图；
图13为本申请实施例提供的一种通信装置结构示意图；
图14为本申请实施例提供的一种通信装置结构示意图；
图15为本申请实施例提供的一种通信装置结构示意图；
图16为本申请实施例提供的一种通信装置结构示意图；
图17为本申请实施例提供的一种通信装置结构示意图；
图18为本申请实施例提供的一种通信装置结构示意图；
图19为本申请实施例提供的一种通信装置结构示意图；
图20为本申请实施例提供的一种通信装置结构示意图；
图21为本申请实施例提供的一种通信装置结构示意图；
图22为本申请实施例提供的一种通信装置结构示意图。
具体实施方式
下面将结合附图对本申请作进一步地详细描述。
本申请实施例可以应用于各种移动通信系统，例如5G(例如新无线(New Radio，NR)，新一代核心网(5G Core Network)系统)等移动通信系统。
如前所述，本申请实施例提供的方法及装置可以应用于5G系统中，在正在讨论的5G网络架构中，有多种可能的架构。如图1所示，为一种可能的5G网络架构示意图。在图1所示的网络架构中，包括网络数据分析设备(Network Data Analytics，NWDA)接入与移动性管理功能(Access and Mobility Management Function，AMF)、会话管理功能(Session Management Function，SMF)、策略控制功能(Policy Control Function，PCF)、接入网(Access  Network，AN)(可包括无线接入网(RAN)或其他接入网)、用户面功能(User Plane Function，UPF)、数据网络(Data Network，DN)等网元。
其中，SMF负责会话管理、终端的互联网协议(Internet Protocol，IP)地址分配与管理，UP锚点功能的分配与选择、并且负责UPF与用户面路径的(重)选择等。AMF负责接入与移动性管理，是N2(AMF与RAN设备之间的接口)接口的终结点，完成注册管理、连接管理以及可达性管理、分配注册区列表(Registration Area list)以及移动性管理等功能，并且透明路由会话管理(Session Management，SM)消息到SMF。UPF是用户面功能设备，负责为终端提供数据包的路由与转发、合法监听、以及下行数据包缓存并且触发下行数据包通知消息等服务。
结合图1，如图2所示，为本申请实施例提供的一种网络结构示意图。DN下有3个UPF，分别为UPF1，UPF2和UPF3，每个UPF分别有对应的服务区域，每个服务区域中包括至少一个RAN。图1中，以UPF1的服务区域中包括RAN1、UPF2的服务区域中包括RAN2、UPF3的服务区域中包括RAN3为例进行说明。图1中UPF1是会话的锚点(Anchor)UPF，UPF2和UPF3是会话的非锚点UPF。终端建立会话时，网络侧选择合适的UPF为终端服务并为终端分配IP地址。例如在图中T1时刻，终端在建立会话时，网络侧(例如SMF)选择UPF1为终端服务，并为终端分配IP，然后UPF1锚定该IP并为终端提供N3连接。此时，终端的下行数据到达DN后，DN转发至UPF1，然后由UPF1通过其服务区域中的RAN1转发至终端。终端的上行数据的传输路径与下行数据的传输路径相反，在此不再赘述。
在T2时刻，若终端仍在UPF1的服务区域内，则终端的该会话的用户面路径不变，此时终端的上行和下行数据的传输路径不变。
在T3时刻，若终端移动到UPF2服务区域内，则终端的该会话的数据传输的N3连接由UPF2提供，UPF1仍然锚定该会话的IP即为该会话提供N6连接，此时终端的下行数据到达DN后，DN转发至UPF1，然后由UPF1转发至UPF2，UPF2再通过其服务区域中的RAN2转发至终端。终端的上行数据的传输路径不再赘述。
在T4时刻，若终端移动到UPF3服务区域内，则终端的该会话的数据传输的N3连接由UPF3提供，UPF1仍然锚定该会话的IP即为该会话提供N6连接，此时终端的下行数据到达DN后，DN转发至UPF1，然后由UPF1转发至UPF3，UPF3再通过其服务区域中的RAN3转发至终端。终端的上行数据的传输路径不再赘述。
上面描述的过程中，若终端处于空闲态，或者终端处于非空闲态但终端的会话被去激活，此时，终端从UPF1的服务区域移动到UPF2的服务区域，网络侧还是会把终端的下行数据发送至UPF1，从而导致终端无法接收到下行数据。相应的，终端从UPF2的服务区域移动到UPF3的服务区域，也会存在上述问题。为此本申请提供一种通信方法及装置用以解决上述问题，该方法及装置可以适用于终端从UPF1的服务区域移动到UPF2的服务区域的场景，也可以适用于终端从UPF2的服务区域移动到UPF3的服务区域的场景，下面将详细描述。
同时，需要说明的是，本申请实施例中，移动性管理网元可以是指AMF等设备；会话管理网元可以是指SMF等设备；用户面网元可以是指UPF等设备。
本申请实施例中，终端，又称之为用户设备(User Equipment，终端)，是一种向用户提供语音和/或数据连通性的设备，例如，具有无线连接功能的手持式设备、车载设备等。 常见的终端例如包括：手机、平板电脑、笔记本电脑、掌上电脑、移动互联网设备(mobile internet device，MID)、可穿戴设备，例如智能手表、智能手环、计步器等。
本申请实施例中，接入网网元可以是普通的基站(如Node B或eNB)，可以是新无线控制器(New Radio controller，NR controller)，可以是5G系统中的gNode B(gNB)，可以是集中式网元(Centralized Unit)，可以是新无线基站，可以是射频拉远模块，可以是微基站，可以是中继(relay)，可以是分布式网元(Distributed Unit)，可以是接收点(Transmission Reception Point，TRP)或传输点(Transmission Point，TP)或者任何其它无线接入设备，但本申请实施例不限于此。
需要说明的是，本申请实施例中，接入网网元并不一定是实体设备，可能是虚拟化网元或其他实体或网元，在此只是为了描述方便才称为“接入网网元”，具体可以根据实际的应用场景确定。相应的，移动性管理网元、会话管理网元、用户面网元也不一定是实体设备，可能是虚拟化网元或其他实体或网元，上述名称只是为了描述方便，具体可以根据实际的应用场景确定。
结合前面的描述，参见图3，为本申请实施例提供的一种通信方法流程示意图。该方法包括：
步骤301：接入网网元从移动性管理网元接收第一会话的隧道信息；所述隧道信息为所述接入网网元与接收到所述终端的下行数据的第一用户面网元之间隧道的信息。
步骤302：所述接入网网元确定所述隧道信息无效，向所述会话管理网元发送第一信息，所述第一信息用于指示所述隧道信息无效。
步骤303：会话管理网元从接入网网元接收第一信息。
步骤304：所述会话管理网元根据所述第一信息，选择为所述终端传输数据的第二用户面网元。
通过上述方法，接入网网元对接收到的隧道信息是否有效进行判断，并在确定隧道信息无效之后，向会话管理网元指示所述隧道信息无效，从而可以使得会话管理网元及时确定隧道信息无效，从而保证终端的业务能够及时有效的建立，避免根据失效的隧道信息建立业务导致的业务建立失败。
步骤301之前，终端处于空闲(idle)态，或者处于非空闲态但终端的第一会话被去激活。在终端处于空闲态，或者终端处于非空闲态但终端的第一会话被去激活之前，网络侧指示第一用户面网元为终端服务。其中，第一用户面网元可以是锚点用户面网元，例如图2中的UPF1，也可以是非锚点用户面网元，例如UPF2。非空闲态可以是指连接管理连接(Connetion management-CONNECTED)态。
当第一用户面网元接收到所述终端的下行数据时，若终端已经移动出第一用户面网元的服务区域，第一用户面网元仍然会通知会话管理网元其接收到终端的下行数据，随后会话管理网元会发送会话管理信息给连接的移动性管理网元。在发送会话管理信息之前，会话管理网元可以确定保存的第一会话的隧道信息对应的用户面网元是第一用户面网元，从而将包括所述隧道信息的会话管理信息发送给连接该会话管理网元的移动性管理网元。
需要说明的是，本申请实施例中，隧道信息可以是指CN N3 Tunnel Info(Core Network N3 Tunnel Info)即核心网N3隧道信息，(R)AN Tunnel Info即接入网网元隧道信息等信息，CN N3 Tunnel Info与(R)AN Tunnel Info为在核心网跟接入网的连接的两端的信息；相应的，会话管理信息可以是指N2 Session Management information等信息。
步骤301中，接入网网元接收的包括第一会话的隧道信息的消息可以为N2 SM消息。第一会话为接入网网元与第一用户面网元之间的会话。
步骤302中，接入网网元接收到第一会话的隧道信息之后，若确定不能连接到所述隧道信息对应的所述第一用户面网元，则可以确定所述隧道信息无效。相应的，接入网网元若确定能连接到所述隧道信息对应的所述第一用户面网元，则可以确定所述隧道信息有效。
举例来说，接入网网元可以通过对比接入网网元中配置可连接的用户面网元的IP地址列表中是否包括所述隧道信息中所携带的第一用户面网元的IP地址，若IP地址列表中包括第一用户面网元的IP地址，则可以确定能连接到所述第一用户面网元，若IP地址列表中不包括第一用户面网元的IP地址，则可以确定不能连接到所述第一用户面网元。
当然以上只是示例，接入网网元还可以通过其他方式确定是否可以连接到所述隧道信息对应的所述第一用户面网元，在此不再赘述。
接入网网元确定所述隧道信息无效之后，可以向移动性管理网元发送指示所述隧道信息无效的第一信息。例如，接入网网元可以通过终端上下文建立的响应消息向移动性管理网元发送所述第一信息。移动性管理网元接收到所述第一信息之后，可以将所述第一信息转发给会话管理网元。例如，移动性管理网元向会话管理网元发送包括接收到的终端上下文建立的响应消息的N11消息，从而实现将第一信息转发给会话管理网元。
可选的，所述第一信息包括所述第一会话的标识和原因值，所述第一会话与所述隧道关联，所述原因值用于指示所述隧道信息无效。进一步可选的，所述原因值可以用于指示隧道信息无效的原因。例如，无效原因可以是指接入网网元不能连接到所述隧道信息对应的所述第一用户面网元等，无效原因具体根据实际情况确定，在此不再赘述。
需要说明的是，接入网网元若确定所述隧道信息有效，接入网网元则可以直接完成建立终端与接入网网元之间的数据无线承载(Data radio bearers，DRB)通道的建立等操作。
步骤303中，会话管理网元接收到的接入网网元发送的第一信息，是由移动性管理网元转发的，具体可以参考前面的描述，在此不再赘述。
在步骤304中，会话管理网元根据所述第一信息确定终端的第一会话的隧道信息无效之后，重新选择为终端服务的第二用户面网元。
会话管理网元可以根据终端的位置信息确定第二用户面网元，终端的位置信息可以通过寻呼终端的过程中，终端发送的业务请求(Service Request，SR)消息获得，也可以通过其他方式获得，在此并不限定。
会话管理网元确定了第二用户面网元之后，与第二用户面网元之间建立会话，并建立新的隧道，可选的，还建立缓存数据的转发隧道。
例如，若第一用户面网元与第二用户面网元均不是锚点用户面网元，此时会话管理网元可以与第二用户面网元进行交互，建立新的隧道，并建立第一用户面网元与第二用户面网元之间的缓存数据的转发隧道。会话管理网元与锚点用户面网元进行交互，进行会话修改，连通锚点用户面网元和第二用户面网元之间的数据通道。会话管理网元与第一用户面网元交互，建立第一用户面网元与第二用户面网元之间的缓存数据的转发隧道。经过上述步骤，实现建立了第一用户面网元与第二用户面网元之间的转发隧道，可以把缓存在第一用户面网元的终端的下行数据转发到第二用户面网元，并进一步通过跟第二用户面网元连接的接入网网元把缓存的下行数据发送给所述终端。其中，新的隧道是第二用户面网元与接入网网元之间的隧道，修改之后的会话是终端设备通过接入网网元与第二用户面网元之 间的会话。完成转发隧道的建立之后，第一用户面网元将接收到的下行数据通过转发隧道转发至第二用户面网元，第一用户面网元完成缓存数据的转发处理之后，会话管理网元跟第二用户面网元交互，删除转发隧道，同时会话管理网元跟第一用户面网元交互，删除转发隧道和第一会话。
相应的，若第一用户面网元是锚点用户面网元，而第二用户面网元不是锚点用户面网元，此时会话管理网元与第二用户面网元进行交互，建立新的隧道；会话管理网元与第一用户面网元交互，进行会话修改，连通第一用户面网元和第二用户面网元之间的数据通道，用于从该数据通道传递缓存数据和下行数据给终端。
会话管理网元建立新的隧道之后，重新构造携带新隧道的隧道信息的N2 SM信息，然后向移动性管理网元发送该N2 SM信息，移动性管理网元再将新的隧道的隧道信息透传给接入网网元，并由接入网网元完成DRB通道的建立。
上面的过程结束后，终端可以通过第二用户面网元进行上行数据的传输。
接入网网元接收到新的隧道的隧道信息并确定用户面连接激活之后，通过移动性管理网元通知会话管理网元该会话的接入网网元隧道信息(RAN Tunnel Information)。
需要说明的是，此处的接入网网元隧道信息为接入网侧的隧道信息，会话管理网元发送给接入网的N2 SM信息携带的隧道信息为核心网N3隧道信息，转发隧道为核心网用户面网元之间的隧道，接入网网元隧道信息与会话管理网元发送给接入网的N2 SM信息携带的隧道信息有对应关系，即接入网网元隧道信息中包含的隧道与核心网N3隧道信息包含的隧道为在核心网跟接入网的连接的两端。
会话管理网元跟第二用户面网元交互，进行会话修改，通知第二用户面网元下行数据通道的接入网网元隧道信息。会话管理网元向给移动性管理网元发送确认消息，终端的业务建立流程完成，终端和网络侧之间可以相互传输数据。
下面通过具体的实施例描述前面的过程。
如图4所示，为本申请实施例提供的一种通信方法流程示意图。
图4的流程中，以接入网网元为RAN，移动性管理网元为AMF，会话管理网元为SMF，用户面网元为UPF为例进行说明，其他情况可以参考图4的流程，在此不再赘述。
图4中，锚点用户面网元为UPF1，第一用户面网元为UPF2，第二用户面网元为UPF3，第一用户面网元和第二用户面网元均为非锚点用户面网元，即网络侧发送给终端的下行数据要通过UPF1转发至UPF2或UPF3，相应的，UPF2或UPF3接收到的上行数据都要通过UPF1转发给DN。
步骤401：UPF1将接收到的终端的下行数据转发至UPF2。
步骤402：UPF2缓存接收到的下行数据。
步骤403：UPF2向SMF发送数据通知消息，以便通知SMF已经接收到终端的下行数据。
步骤404：SMF向UPF2返回数据通知确认消息。
步骤405：SMF确定出所述终端的第一会话的隧道信息，并向AMF发送N11消息，用于请求AMF转发N2 SM消息，所述N11消息中包括第一会话的会话标识、会话管理信息等信息，其中会话管理信息中包括所述隧道信息。
需要说明的是，SMF确定出的所述隧道信息对应的UPF为UPF2。
对于CM-IDLE态的UE，需要通过步骤406发起寻呼流程。对于CM-CONNECTED 的UE，AMF不需要发起寻呼，则转至步骤409。
步骤406：AMF向RAN发送寻呼消息。
步骤407：RAN向终端发送寻呼消息。
步骤408：终端接收到寻呼消息后，通过RAN向AMF发送寻呼响应消息，触发业务建立流程。
步骤409：AMF向RAN发送包括所述隧道信息的N2消息。
步骤410：RAN判断所述隧道信息是否有效，若确定所述隧道信息有效，则转至步骤419；若确定所述隧道信息无效，则转至步骤411。
其中，RAN判断所述隧道信息是否有效的具体方法，可以参考前面的描述，在此不再赘述。
步骤411：RAN向AMF发送N2响应消息，所述N2响应消息中包括第一信息，所述第一信息用于指示第一会话的隧道信息无效。
其中，所述第一信息可以包括所述第一会话的标识和隧道信息无效的原因值。
步骤412：AMF向SMF发送包括所述N2响应消息的N11消息。
步骤413：SMF通过第一信息得知所述隧道信息无效后，如果SMF已经根据最新位置信息确定为终端服务的UPF，则执行步骤417,否则重新确定为终端服务的UPF，此时确定出的UPF为UPF3。
步骤414：SMF与UPF3交互，建立终端与UPF3之间的新的隧道，并建立UPF2与UPF3之间的缓存数据的转发隧道。
其中，新的隧道是指UPF3与RAN之间的隧道。
步骤415：SMF与UPF1交互，进行会话修改，将UPF1与UPF2之间的第一会话的连接修改为UPF1与UPF3之间的连接。
步骤416：SMF与UPF2交互，建立UPF2与UPF3之间的缓存数据的转发隧道。
步骤417：SMF重新构造N2 SM信息，其中携带新的隧道的隧道信息，然后向AMF发送该信息。
步骤418：AMF转发N2 SM信息给RAN，其中包括新的隧道的隧道信息。
步骤419：RAN与终端之间进行无线资源控制(Radio Resource Control，RRC)连接重配置，建立DRB(Data Radio Bearer，数据无线承载用于数据传输的无线连接)。
步骤420：终端此处可以开始上行数据的传输。
步骤421：RAN向AMF发送请求响应消息，其中包括RAN隧道信息。
步骤422：AMF向SMF转发RAN隧道信息。
步骤423：SMF与UPF3交互，进行会话修改，并通知UPF3下行数据通道的RAN隧道信息。
步骤424：UPF2通过转发隧道向UPF3转发缓存的终端的下行数据。
步骤425：UPF3将下行数据转发至终端。
步骤426：SMF与UPF3交互，删除转发隧道。
步骤427：SMF与UPF2交互，删除转发隧道。
步骤428：SMF向AMF发送N11确认消息，业务建立流程完成。
步骤429：UPF3向终端转发接收到的下行数据。
当然，上述过程中，UPF2也可以为锚点UPF，此时，SMF不需要为会话完成UPF2 和UPF3之间的转发隧道的处理，即包括建立上述过程中建立转发隧道、转发缓存数据和删除转发隧道，其他流程均相似，在此不再赘述。
如上过程中，RAN侧DRB的建立可以提前，即在RAN判断隧道无效之后，先建立DRB，并在通过AMF给SMF返回N2 SM响应消息中携带RAN Tunnel Info，SMF获取到新的CN N3 Tunnel之后，通知RAN更新CN N3 Tunnel接口即可。这样节省了对于新建立的N3UPF即UPF3的修改操作，即在建立UPF3的时候的就携带RAN Tunnel Info给UPF3。对于UPF2和UPF3均为非锚点用户面网元即涉及到转发隧道处理的情况处理类似，在此不再赘述。
本申请实施例中，可以由移动性管理网元判断是否更新会话管理网元发送的会话管理信息，下面详细描述。
结合前面的描述，参见图5，为本申请实施例提供的一种通信方法流程示意图。该方法包括：
步骤501：会话管理网元向移动性管理网元发送会话管理信息以及位置区域信息。
其中位置区域信息指示的位置区域，可以为接收到终端的下行数据的用户面网元的服务区域。
会话管理信息包括但不限于N2 SM信息，会话管理信息中包括隧道信息。
步骤502：移动性管理网元从会话管理网元接收会话管理信息以及位置区域信息，并确定终端的位置信息；
步骤503：所述移动性管理网元根据所述位置区域信息以及所述位置信息确定所述终端位于所述位置区域信息指示的服务区域外，向所述会话管理网元指示所述会话管理信息未被转发，并触发所述会话管理网元更新所述会话管理信息。
步骤504：所述会话管理网元从所述移动性管理网元获知所述会话管理信息未被转发，其中，所述会话管理信息未被转发与所述位置区域信息和终端的位置信息关联；所述会话管理网元更新所述会话管理信息。
通过上述方法，移动性管理网元根据所述位置区域信息以及所述位置信息确定所述终端位于所述位置区域信息指示的服务区域外时，可以向所述会话管理网元指示所述会话管理信息未被转发，并触发所述会话管理网元更新所述会话管理信息，从而能够保证终端的业务能够及时有效的建立，避免终端由于位于其它用户面网元的服务区域导致的业务建立失败。
步骤501之前，终端可能处于空闲态，或者处于非空闲态但终端的第一会话被去激活。第一会话为接入网网元与第一用户面网元之间的会话。
在终端处于空闲态，或者终端处于非空闲态但终端的第一会话被去激活之前，网络侧指示第一用户面网元为终端服务。其中，第一用户面网元可以是锚点用户面网元，也可以是非锚点用户面网元，本申请实施例对此并不限定；非空闲态可以是指连接管理连接态。
当第一用户面网元接收到所述终端的下行数据时，若终端已经移动出第一用户面网元的服务区域，第一用户面网元仍然会通知会话管理网元其接收到终端的下行数据，随后会话管理网元可以确定保存的第一会话的隧道信息对应的用户面网元是第一用户面网元，从而将包括所述隧道信息的会话管理信息发送给连接该会话管理的移动性管理网元。
具体的，在步骤501中，会话管理网元向移动性管理网元发送请求消息，该请求消息用于请求移动性管理转发N2 SM消息。该请求消息中包括第一会话的会话标识、位置区域 信息、会话管理信息等，其中会话管理信息中包括所述隧道信息。其中，第一用户面网元即为第一会话提供N3连接的用户面网元。所述第一用户面网元的服务区域的服务区域信息可以是第一用户面网元能够的连接RAN的TAI列表，或者，位置区域信息还可以通过一个约定的标识信息来指示，以便于减少接口上的信令开销。
最后移动性管理网元通过接入网网元完成对终端的寻呼，具体可以参考前面的流程，在此不再赘述。
步骤502中，移动性管理网元可以通过寻呼过程中，终端发送的SR消息获得终端的位置信息。
当然，移动性管理网元还可以通过其他方式确定终端的位置信息，在此不再逐一举例说明。
步骤503中，所述移动性管理网元若根据所述终端的位置信息确定所述终端位于所述位置区域信息指示的位置区域外，则可以确定所述隧道信息无效，否则可以确定所述隧道信息有效。
所述移动性管理网元确定所述隧道信息无效之后，可以向所述会话管理网元发送第一消息，从而通过所述第一消息指示会话管理信息未被转发或者会话管理信息需要更新，进而可以触发会话管理网元对会话管理信息进行更新，具体如何触发，本申请实施例对此并不限定。
或者，所述移动性管理网元确定所述隧道信息无效之后，可以不向RAN转发所述会话管理信息，或者向RAN转发所述会话管理信息，但是最终确定转发失败，所述移动性管理网元从而可以向所述会话管理网元发送用于指示所述会话管理信息未转发或所述会话管理信息需要更新的信息，这个信息可以是执行结果或者原因值。所述信息可以位于第一消息中。
可选的，所述第一消息还可以终端当前位置信息。终端当前的位置信息可以在第一消息中携带也可以通过独立的订阅上报信息携带。第一消息中携带终端当前位置信息的实现方式，可以通过直接在移动管理设备发送的第一消息中携带位置信息，也可以通过移动管理设备判断会话管理网元进行了该终端的位置信息订阅则在第一消息发送的同时发送位置上报信息。本申请实施例中，所述移动性管理网元确定所述隧道信息有效之后，则按照现有技术执行后面的流程，例如所述移动性管理网元将隧道信息发送给接入网网元。
步骤504中，会话管理网元接收到第一消息之后，若根据第一消息确定所述会话管理信息未转发或所述会话管理信息需要更新，则可以重新构造会话管理信息，从而获得更新后的会话管理信息，所述更新后的会话管理信息包括为所述终端传输数据的第二用户面网元的信息。
可选，第二用户面网元的选择是根据终端当前位置信息和会话访问的数据网络(DN)等信息确定的，第二用户面网元的选择可以是在会话管理网元接收到第一消息之后完成的，也可以是会话管理网元在接收到独立的位置信息上报之后完成的。
会话管理网元可以将服务区域覆盖所述终端的位置信息的用户面网元确定为第二用户面网元，当然还可以根据其他方式确定第二用户面网元，在此不再赘述。
会话管理网元还可以与第一用户面网元进行交互，进行会话修改，连通第一用户面网元和第二用户面网元之间的数据通道，或者建立第一用户面网元和第二用户面网元之间的转发隧道，用于从第一用户面网元传输缓存的下行数据至第二用户面网元，再传输给终端。
会话管理网元可以向移动性管理网元发送新的隧道的隧道信息，移动性管理网元再将新的隧道的隧道信息透传给接入网网元，并由接入网网元完成DRB通道的建立。
上面的过程结束后，终端可以通过第二用户面网元进行上行数据的传输。
接入网网元接收到新的隧道的隧道信息并确定用户面连接激活之后，通过移动性管理网元通知会话管理网元该会话的接入网网元隧道信息。
会话管理网元跟第二用户面网元交互，进行会话修改，通知第二用户面网元下行数据通道的接入网网元隧道信息。
随后，第一用户面网元将接收到的下行数据通过转发隧道转发至第二用户面网元。
第一用户面网元完成转发数据处理之后，会话管理网元跟第二用户面网元交互，删除转发隧道，同时会话管理网元跟第一用户面网元交互，删除转发隧道和第一会话。
会话管理网元向给移动性管理网元发送确认消息，终端的业务建立流程完成，终端和网络侧之间可以相互传输数据。
下面通过具体的实施例描述前面的过程。
如图6所示，为本申请实施例提供的一种通信方法流程示意图。
图6的流程中，以接入网网元为RAN，移动性管理网元为AMF，会话管理网元为SMF，用户面网元为UPF为例进行说明，其他情况可以参考图6的流程，在此不再赘述。
图6中，第一用户面网元为UPF1，为第一会话的锚点用户面网元，第二用户面网元为UPF2，为第一会话的非锚点用户面网元。
步骤601：UPF1缓存接收到的终端的下行数据。
步骤602：UPF1向SMF发送数据通知消息，以便通知SMF已经接收到终端的下行数据。
步骤603：SMF向UPF1返回数据通知确认消息。
步骤604：SMF确定出所述终端的第一会话的隧道信息，并向AMF发送N11消息，用于请求AMF转发N2 SM消息，所述N11消息中包括第一会话的会话标识、服务区域信息、会话管理信息等信息，其中会话管理信息中包括所述隧道信息。
需要说明的是，SMF确定出的所述隧道信息对应的UPF为UPF1。
步骤605：AMF向RAN发送寻呼消息。对于CM-CONNECTED的UE，AMF不需要发起寻呼，则转至步骤608。
步骤606：RAN向终端发送寻呼消息。
步骤607：终端接收到寻呼消息后，通过RAN向AMF发送服务响应消息，触发业务建立流程。
步骤608：AMF判断所述隧道信息是否有效，若确定所述隧道信息有效，则转至步骤614；若确定所述隧道信息无效，则转至步骤609。
步骤609：AMF向SMF发送第一消息。该第一消息中可以携带所述位置信息,例如，SMF可向AMF订阅UE的位置信息，AMF向SMF发送第一消息时同时携带位置信息的。或者，第一消息为AMF返回给SMF的响应消息，所述位置信息通过独立的订阅上报实现。可选的，所述第一消息还包括N2 SM信息的转发结果，该结果为会话管理信息未被转发或者会话管理信息需要更新。
步骤610：SMF根据第一消息得知所述N2 SM信息转发结果之后，如果SMF已经根据最新位置信息确定为终端服务的UPF，则执行步骤613,否则重新确定为终端服务的UPF， 此时确定出的UPF为UPF2。
步骤611：SMF与UPF2交互，建立终端与UPF2之间的新的会话的新的隧道。
其中，新的隧道是指UPF2与RAN连接的隧道。
步骤612：SMF与UPF1交互，进行会话修改，连通UPF1和UPF2之间的数据通道。
步骤613：SMF重新构造N2 SM信息，其中，N2 SM信息包括新的隧道的隧道信息，然后，SMF向AMF发送该N2 SM信息。
步骤614：AMF向RAN转发新的隧道的隧道信息。
步骤615：RAN与终端之间进行无线资源控制(Radio Resource Control，RRC)连接重配置。
步骤616：终端此处可以开始上行数据的传输。
步骤617：RAN向AMF发送请求响应消息，其中包括RAN隧道信息。
步骤618：AMF向SMF发送N11消息，其中包括RAN隧道信息。
步骤619：UPF1通过UPF1和UPF2之间的数据通道向UPF2转发缓存的终端的下行数据。
步骤620：UPF2将下行数据转发至终端。
步骤621：SMF向AMF发送N11确认消息，业务建立流程完成。
步骤622：UPF2向终端转发接收到的下行数据。
在服务化架构下，移动性管理网元也可以判断是否更新会话管理网元发送的会话信息，下面详细描述。
结合前面的描述，参见图7，为本申请实施例提供的一种通信方法流程示意图。该方法包括：
步骤701：会话管理网元向移动性管理网元发送位置区域条件信息和会话管理信息。
可选的，所述位置区域条件信息用于指示所述终端的位置在所述位置区域内，或者所述位置区域条件信息包括位置区域和第一条件，其中第一条件用于指示所述终端的位置在所述位置区域内。
会话信息包括终端的第一会话的核心网隧道信息。
步骤702：移动性管理网元从会话管理网元接收位置区域条件信息和会话管理信息，并确定终端的位置信息；所述位置区域条件信息用于指示所述终端的位置在所述位置区域内。
上述步骤中，所述位置区域用于指示接收到所述终端的下行数据的第一用户面网元的服务区域,这里的位置区域信息还可以约定的一个标识，从而可以于减少会话管理网元发送的消息大小。在服务化架构下，对于包括隧道信息的第一消息的转发，会话管理网元会调用移动性管理网元提供的N2 SM信息转发的服务。
条件信息在本申请实施例中，包括但不限于终端的位置信息位于所述服务区域信息指示的服务。相应的，这里的第一用户面网元是指为第一会话提供N3连接的用户面网元。所述第一用户面网元的服务区域的服务区域信息可以是第一用户面网元能够的连接RAN的TAI列表。
步骤703：若所述移动性管理网元确定所述终端的位置信息不满足所述位置区域条件信息，向所述会话管理网元发送第一消息，所述第一消息用于触发会话管理网元更新会话管理信息。
所述移动性管理网元确定所述服务区域信息以及所述位置信息满足所述条件信息时，可以直接将会话信息转发至接入网网元，并不向会话管理网元发送第一消息的响应消息，进而不需要更新N2 SM信息。
如上所述，在申请本实施例中，会话管理信息为包含核心网隧道信息的N2 SM信息，会话管理网元请求移动性管理网元将该信息转发给接入网。
可选的，若所述移动性管理网元确定所述服务区域信息以及所述位置信息满足所述条件信息，所述移动性管理网元送第一消息进而不需要更新N2 SM信息，而是直接转发会话管理信息给接入网。
步骤704：所述会话管理网元接收所述移动性管理网元发送第一消息，并确定更新的会话管理信息，所述更新后的会话管理信息包括为所述终端传输数据的第二用户面网元的隧道信息。
其中，所述第一消息为所述移动性管理网元确定所述位置信息不满足所述位置区域条件信息之后发送的。
通过上述方法，移动性管理网元确定终端的位置信息不满足位置区域条件信息时，向所述会话管理网元发送用于触发会话管理网元更新会话管理信息的第一消息，从而能够保证终端的业务能够及时有效的建立，避免终端由于位于其它用户面网元的服务区域导致的业务建立失败。
步骤701至步骤704的其他内容可以参考步骤501至步骤504中的描述，在此不再赘述。
结合前面的描述，如图8所示，为本申请实施例提供的一种通信方法流程示意图。
图8的流程中，以接入网网元为RAN，移动性管理网元为AMF，会话管理网元为SMF，用户面网元为UPF为例进行说明，其他情况可以参考图8的流程，在此不再赘述。
图8中，第一用户面网元为UPF1，为第一会话的锚点用户面网元，第二用户面网元为UPF2，为第一会话的非锚点用户面网元。
步骤801：UPF1缓存接收到的终端的下行数据。
步骤802：UPF1向SMF发送数据通知消息，以便通知SMF已经接收到终端的下行数据。
步骤803：SMF向UPF1返回数据通知确认消息。
步骤804：SMF确定出所述终端的第一会话的核心网隧道信息，并向AMF发送N11消息，用于请求AMF转发N2 SM消息，所述N11消息中包括位置区域条件信息、会话管理信息(N2 SM信息)、第一会话的会话标识等信息，其中会话管理信息中包括所述隧道信息。
步骤805：AMF向RAN发送寻呼消息。对于CM-CONNECTED的UE，AMF不需要发起寻呼，则转至步骤808。
步骤806：RAN向终端发送寻呼消息。
步骤807：终端接收到寻呼消息后，通过RAN向AMF发送服务响应消息，触发业务建立流程。
步骤808：AMF判断所述终端的位置信息满足所述位置区域条件信息，若终端在所述位置区域内，则可以确定所述隧道信息有效，从而可以直接将隧道信息转发至接入网网元；否则转至步骤809。
步骤809：AMF向SMF发送包括所述位置信息的第一消息，所述第一消息触发SMF更新会话管理信息。该第一消息中可以携带转发N2 SM信息的结果和所述位置信息,例如，SMF可向AMF订阅UE的位置信息，AMF向SMF发送第一消息时同时携带位置信息的。或者，第一消息为AMF返回给SMF的响应消息，该第一消息中携带转发N2 SM信息的结果，该结果为未转发或者需要更新，而所述位置信息不通过第一消息携带，而是通过独立的订阅上报实现。
步骤810：SMF在接收到第一消息后，重新构造N2 SM信息，其中包括在当前位置为终端服务的UPF，从而实现会话管理信息的更新，此时为终端服务的UPF为UPF2。
步骤810之后的流程可以参考步骤610至步骤621中的描述，在此不再赘述。
本申请实施例中，还可以由会话管理网元判断隧道信息是否有效，下面详细描述。
结合前面的描述，参见图9，为本申请实施例提供的一种通信方法流程示意图。该方法包括：
步骤901：会话管理网元获取终端的位置信息；
步骤902：所述会话管理网元根据所述位置信息确定所述终端位于所述终端的第一会话对应的用户面网元的服务区域外，并根据所述终端的位置信息确定为所述终端传输数据的第二用户面网元。
通过上述方法，会话管理网元获取到中的位置信息之后，根据所述位置信息确定与所述终端位于所述终端的第一会话对应的用户面网元的服务区域外，则可以确定接收到的隧道信息无效，从而根据终端的位置信息重新确定为终端传输数据的第二用户面网元，从而保证终端的业务能够及时有效的建立，避免终端由于位于其它用户面网元的服务区域导致的业务建立失败。
步骤901之前，终端可能处于空闲态，或者处于非空闲态但终端的第一会话被去激活。
在终端处于空闲态，或者终端处于非空闲态但终端的第一会话被去激活之前，为终端服务的第一用户面网元接收到所述终端的下行数据时，若终端已经移动出第一用户面网元的服务区域，第一用户面网元仍然会通知会话管理网元其接收到终端的下行数据。其中，第一用户面网元可以是锚点用户面网元，也可以是非锚点用户面网元，本申请实施例对此并不限定。
会话管理网元确定第一用户面网元接收到终端的下行数据之后，可以获取先前保存的所述终端的第一会话对应的第一隧道信息。
在步骤901中，会话管理网元可以向移动性管理网元发送请求所述终端的位置信息的第一消息，从而获得终端的位置信息。
在该实现方式下，会话管理网元收到第一用户面网元发的下行数据通知消息后，向移动性管理网元发送请求所述终端的位置信息的第一消息。移动性管理网元接收到第一消息之后，可以根据所述终端的状态确定所述终端的位置信息。具体的，移动性管理网元确定所述终端处于连接态，则可以直接获取所述终端的位置信息；或者，所述移动性管理网元确定所述终端处于空闲态，则可以通过寻呼所述终端获取所述终端的位置信息。移动性管理网元随后可以向所述会话管理网元发送所述位置信息。
需要说明的是，该场景下，第一消息还可以是新增的交互消息，消息中携带终端的标识。如果是在服务化架构下，这里需要会话管理网元调用一个新的用于获取终端的位置的服务。可选的，第一消息可以是未携带隧道信息的会话管信息转发消息，如果是在服务化 架构下，这里也可以是会话管理网元调用AMF用于转发N2 SM信息的服务。
步骤902中，会话管理网元若根据所述位置信息确定所述终端在接收到所述终端的下行数据的用户面网元的服务区域外，则可以确定所述终端位于所述终端的第一会话对应的第一用户面网元的服务区域外，并确定所述隧道信息无效，否则可以确定所述隧道信息有效。
需要说明的是，会话管理网元确定隧道信息有效时，则按照现有技术执行后面的流程，例如将包含核心网隧道信息的会话管理信息通过移动管理设备转发给接入网。
会话管理网元确定第二用户面网元之后，还可以与第一用户面网元进行交互，进行会话修改，连通第一用户面网元和第二用户面网元之间的数据通道，或者建立第一用户面网元和第二用户面网元之间的转发隧道，用于从第一用户面网元传输缓存的下行数据至第二用户面网元，再传输给终端。具体可以参考步骤504以及与步骤504相关的描述，在此不再赘述。
可选的，本申请实施例中，会话管理网元还可以获取终端的移动属性和位置信息中的至少一种；然后，所述会话管理网元根据所述移动属性和位置信息中的至少一种确定与所述终端位于所述终端的第一会话对应的用户面网元的服务区域外，并根据所述终端的位置信息确定为所述终端传输数据的第二用户面网元。
下面详细描述。
上述过程中，会话管理网元获取到的终端的移动属性可以包含于移动模式(mobility pattern)，也可以是独立的移动属性参数，会话管理网元可以通过第一会话的建立/修改/释放流程从AMF或者NWDA获取终端的移动属性，或者从NWDA订阅。移动属性的具体的获取过程在此不再赘述。
本申请实施例中，一种可能的实现方式中，会话管理网元可以在会话建立/修改/释放流程从AMF获取终端的位置信息，或者从AMF订阅终端的位置信息。该实现方式下，位置信息的具体的获取过程，在此不再赘述。
会话管理网元根据获取到的不同的参数，确定所述终端位于所述终端的第一会话对应的第一用户面网元的服务区域外，下面分别描述。
一，会话管理网元获取到终端的移动属性
此时，会话管理网元若根据所述移动属性确定所述终端为高移动性终端，则可以确定所述终端位于所述终端的第一会话对应的第一用户面网元的服务区域外，并确定所述隧道信息无效，所述第一隧道信息为第一会话对应的所述第一用户面网元与接入网网元之间隧道的信息；相应的，会话管理网元若根据所述移动属性确定所述终端为低移动性终端，则可以确定所述隧道信息有效。
其中，高移动性终端可以是指移动速度大于阈值的终端，低移动性终端可以是指移动速度小于或等于阈值的终端。
二，会话管理网元获取到终端的位置信息
此时，会话管理网元若根据所述位置信息确定所述终端移动出接收到所述终端的下行数据的用户面网元的服务区域，则可以确定所述隧道信息无效，否则可以确定所述终端位于所述终端的第一会话对应的第一用户面网元的服务区域外，并确定所述隧道信息有效。
三，会话管理网元获取到终端的移动属性和位置信息
此时，会话管理网元若根据所述移动属性确定所述终端为低移动性终端，且根据所述 位置信息确定所述终端在接收到所述终端的下行数据的用户面网元的服务区域外，则可以确定所述终端位于所述终端的第一会话对应的第一用户面网元的服务区域外，并确定所述隧道信息无效，否则可以确定所述隧道信息有效。
在该场景下，会话管理网元确定所述隧道信息无效之后，可以向移动性管理网元发送不携带隧道信息的第一消息，用以请求所述终端的当前位置信息，并根据请求获得的终端的当前位置信息确定为所述终端传输数据的第二用户面网元，例如会话管理网元可以将服务区域覆盖所述终端的当前位置信息的用户面网元确定为第二用户面网元，当然还可以根据其他方式确定第二用户面网元，在此不再赘述。会话管理网元请求的当前位置信息为最新的位置信息，从而可以准确地为终端确定第二用户面网元，具体确定第二用户面网元的过程，可以参考现有技术，在此不再赘述。
移动性管理网元接收到第一消息之后，若确定第一消息中未携带隧道信息，则可以获取终端的当前位置信息，从而向会话管理网元发送终端的当前位置信息。移动性管理网元若确定第一消息中携带隧道信息，则可以直接将隧道信息转发至接入网网元。
可选的，在该场景下，第一消息还可以是新增的交互消息，消息中携带终端的标识。如果是在服务化架构下，这里需要调用会话管理网元一个新的用于获取终端的位置的服务。
会话管理网元根据所述移动属性和位置信息中的至少一种确定所述终端位于所述终端的第一会话对应的用户面网元的服务区域外之后，会话管理网元的其他动作可以参考步骤902中的描述，在此不再赘述。
结合前面的描述，如图10所示，为本申请实施例提供的一种通信方法流程示意图。
图10的流程中，以接入网网元为RAN，移动性管理网元为AMF，会话管理网元为SMF，用户面网元为UPF为例进行说明，其他情况可以图10所示的流程中的描述，在此不再赘述。
图10中，第一用户面网元为UPF1，为第一会话的锚点用户面网元，第二用户面网元为UPF2，为第一会话的非锚点用户面网元。
步骤1001：UPF1缓存接收到的终端的下行数据。
步骤1002：UPF1向SMF发送数据通知消息，以便通知SMF已经接收到终端的下行数据。
步骤1003：SMF向UPF1返回数据通知确认消息。
步骤1004：SMF向AMF发送第一消息，用于请求终端的位置信息。
步骤1005：AMF通过RAN向终端发送寻呼消息。
步骤1006：终端接收到寻呼消息后，通过RAN向AMF发送服务响应消息，触发业务建立流程。
步骤1007：AMF根据所述终端的状态确定所述终端的位置信息。
步骤1008：AMF向SMF发送终端的位置信息。
步骤1009：SMF根据所述位置信息判断所述终端的位置是否在UPF1的服务区域之内，进而判断第一会话的隧道信息是否有效，若有效，则转至步骤1012，否则根据所述位置信息重新确定为终端服务的UPF，并转至步骤1010，此时确定出的UPF为UPF2。
步骤1010：SMF与UPF2交互，建立终端与UPF2之间的新的会话的新的隧道。
其中，新的隧道是指UPF2与RAN之间的隧道。
步骤1011：SMF与UPF1交互，进行会话修改，连通UPF1和UPF2之间的数据通道。
步骤1012：SMF构造N2 SM信息，其中，如果所述位置信息判断所述终端的位置在UPF1的服务区域之内，则直接使用原核心网原隧道信息构造N2 SM信息，否则使用新的隧道的核心网隧道信息构造N2 SM信息然后，SMF向AMF发送该N2 SM信息。
步骤1013：AMF向RAN转发新的隧道的隧道信息。
步骤1014：RAN与终端之间进行RRC连接重配置，建立DRB。
步骤1015：终端此处可以开始上行数据的传输。
步骤1016：RAN向AMF发送请求响应消息，其中包括RAN隧道信息。
步骤1017：AMF向SMF发送N11消息，其中包括RAN隧道信息。
步骤1018：UPF1通过UPF1和UPF2之间的数据通道向UPF2转发缓存的终端的下行数据。
步骤1019：UPF2将下行数据转发至终端。
步骤1020：SMF向AMF发送N11确认消息，业务建立流程完成。
步骤1021：UPF2向终端转发接收到的下行数据。
图10所示的流程中，UPF1和UPF2均为第一会话的非锚点用户面网元，且UPF1和UPF2通过第一会话的锚点用户面网元为终端传输数据时，SMF需要为会话完成UPF2和UPF3之间建立的转发隧道的处理，其他流程均相似，在此不再赘述。SMF需要为UPF1和UPF2之间建立转发隧道的过程可以参考图4所示的流程，在此不再赘述。
结合前面的描述，如图11所示，为本申请实施例提供的一种通信方法流程示意图。
图11的流程中，以接入网网元为RAN，移动性管理网元为AMF，会话管理网元为SMF，用户面网元为UPF为例进行说明，其他情况可以图11所示的流程中的描述，在此不再赘述。
图11中，第一用户面网元为UPF1，为第一会话的锚点用户面网元，第二用户面网元为UPF2，为第一会话的非锚点用户面网元。
步骤1101：UPF1缓存接收到的终端的下行数据。
步骤1102：UPF1向SMF发送数据通知消息，以便通知SMF已经接收到终端的下行数据。
步骤1103：SMF向UPF1返回数据通知确认消息。
步骤1104：SMF终端的移动属性和位置信息中的至少一种判断所述终端是否在UPF1的服务区域内，进而判断第一会话的隧道信息是否有效，若有效，则确定向AMF发送包括所述隧道信息的会话管理信息的第一消息，否则确定向AMF发送不包括所述隧道信息的会话管理信息的第一消息。
步骤1105：SMF向AMF发送第一消息。
步骤1106：AMF通过RAN向终端发送寻呼消息。
步骤1107：终端接收到寻呼消息后，通过RAN向AMF发送服务响应消息，触发业务建立流程。
步骤1108：AMF判断是否需要发送N11消息给触发寻呼的SMF。
具体的，AMF若接收到的第一消息中存在携带隧道信息的N2 SM information，则直接转发N2 SM information给RAN，否则执行步骤1109。
步骤1109：AMF向SMF发送N11消息，用于触发SMF重新构造N2 SM信息。
步骤1110：SMF，重新构造N2 SM信息，其中包括在当前位置为终端服务的UPF，此时为终端服务的UPF为UPF2。，此时确定出的UPF为UPF2。
步骤1110之后的流程可以参考步骤1010至步骤1021中的描述，在此不再赘述。
下面描述如何释放会话。
在服务化架构下，移动性管理网元也可以判断是否转发会话管理网元发送的会话信息，下面详细描述。
该方法包括：
步骤1：会话管理网元向移动性管理网元发送终端状态条件信息和会话管理信息。
可选的，所述终端状态条件信息用于指示所述终端的状态为空闲状态，或者所述终端状态和第一条件，其中第一条件用于指示所述终端的状态为空闲状态。
可选的，所述终端状态条件信息还可以包括"N1 SM delivery can be skipped"。
会话信管理息包括N1 SM信息。
步骤2：移动性管理网元从会话管理网元接收终端状态条件信息和会话管理信息，并确定终端的状态；所述终端状态条件信息用于指示所述终端的状态为空闲状态。
上述步骤中，在服务化架构下，对于N1 SM信息的转发，会话管理网元会调用移动性管理网元提供的N1 SM信息转发的服务。
相应的，所述终端的状态是终端当前的状态。
步骤3：若所述移动性管理网元确定所述终端的状态不满足所述终端状态条件信息，则不转发N1 SM信息给终端，对于N1 SM release信息，通过隐式同步的方式释放该会话的终端。
通过上述方法，会话管理网元确定对会话采取合适的方式进行释放，为需要保持状态同步的会话提供显示的释放避免业务异常，为不需要保持状态同步的会话通过隐式同步的方式释放该会话的终端，节省系统开销。
上述步骤1、2、3也可以结合图12的描述。
如图12所示，为本申请实施例提供的一种会话释放流程示意图。
步骤1201：终端向AMF发送协议数据单元(Protocol Data Unit，PDU)会话释放请求。
该请求可以由终端或网络侧触发。
步骤1202：AMF向SMF发送包括所述PDU会话释放请求的N11消息。
步骤1203：SMF与PCF之间交互，进行会话修改。
步骤1204：SMF进行会话释放的触发。
步骤1205：SMF通知UPF释放用户面路径。
步骤1206：SMF发送N11消息给AMF，其中可以携带N1 SM转发条件信息即终端状态条件信息、N2 SM资源释放请求(Resource Release request)和N1 SM信息(Information)(即PDU会话释放命令(Session Release Command))，触发RAN侧的资源释放，和终端的资源的释放。其中，所述条件信息为终端状态条件信息。
对于N2 SM Release的消息是否需要AMF转发，在SMF侧可以进行判断，对于激活态的会话释放RAN侧资源，需要发送N2 SM消息；对于非激活态的会话，由于RAN侧资源已经释放，因此不需要发送N2 SM消息，会话的状态在SMF就有保存，因此SMF自行判断即可。
但是对于N1 SM消息的转发，该消息中需要进一步携带N1 SM转发条件，这里的终 端状态条件信息在本申请实施例中存在如下几种情况：
1)SMF可以对于IDLE状态的终端的部分会话通过隐式同步的方式释放该会话的终端侧资源，则还可以携带指示信息，指示信息指示出可以不转发N1 SM，例如"N1 SM delivery can be skipped"Indication，这个指示信息可以是独立的也可以是条件的一部分信息；即终端状态条件信息为：终端为IDLE状态并且接收到指示出可以不转发N1 SM的指示信息。
2)SMF也可以统一对IDLE状态的终端的所有会话，通过同步的方式释放该会话的终端的资源，则不需要携带指示出可以不转发N1 SM的指示信息，即终端状态条件信息为：终端为IDLE状态。
3)SMF还可以统一对所有非激活状态的会话，通过隐式同步的方式释放，那么就直接执行释放AMF与SMF的会话上下文及其之间的绑定关系即可，SMF不发送N1 SM信息。
在服务化架构中，1)和2)两种情况下，SMF都进行条件调用AMF的N1 SM消息的转发服务，即AMF提供的N1消息转发服务即Namf_Communication_N1MessageTransfer service operation的输入需要增加这里的条件参数指示服务执行的条件。
步骤1207：AMF根据终端状态条件信息决定是否转发接收到N1 SM消息，AMF若确定终端处于IDLE状态：
1)针对步骤1206中的1)，AMF接收到的消息携带指示出可以不转发N1 SM的指示信息，则不转发跳过步骤1208至步骤1209，通过隐式同步的方式释放终端侧的资源，直接执行步骤1210。
2)针对步骤1206中的2)，AMF不转发跳过步骤1208至步骤1209，通过隐式同步的方式释放终端侧的资源，直接执行步骤1210。
3)其他情况AMF都会转发N1 SM消息，如果终端处于IDLE状态，则通过网络触发SR的方式寻呼终端进而把N1 SM Information转发给终端。如果终端处于CM-CONNECTED状态，则AMF直接转发接收到的N1 SM Information消息给RAN。
在服务化架构下，AMF根据SMF输入的终端状态条件信息执行该N1 SM消息转发服务，满足终端状态条件信息时执行，不满足条件则不执行，并在完成之后返回执行结果。
对于N2 SM Information消息的处理同现有技术，无特殊处理，在此不再赘述。
步骤1208：RAN释放会话相关资源，并转发(N1 SM PDU Session Release Command)给终端完成终端侧的资源释放。
步骤1209：RAN侧资源释放完成，则返回N2资源释放确认消息，其中可以一并传输携带终端释放响应。
步骤1210：AMF发送N11响应消息，其中携带N2 SM资源释放确认(Resource Release Ack)。
步骤1211：SMF向AMF发送N11消息，用于通知AMF会话释放完成。AMF和SMF删除相关会话上下文信息包括AMF/SMF之间的绑定关系等。
步骤1212：释放协议数据单元连接接入网络(Protocol Data Unit Connectivity Access Network，PDU-CAN)会话。
通过上述流程，由SMF完成会话管理信息的处理决策，并将N1 SM转发的条件发送给AMF，AMF在获取到相关终端的状态时，根据SMF设置的转发条件指定该转发服务。
基于相同的技术构思，本申请实施例还提供一种通信装置。
如图13所示，为本申请实施例提供一种通信装置结构示意图。
该通信装置1300包括：
收发单元1301，用于从移动性管理网元接收第一会话的隧道信息；所述隧道信息为所述接入网网元与接收到所述终端的下行数据的第一用户面网元之间隧道的信息；
处理单元1302，用于确定所述隧道信息无效，向所述会话管理网元发送第一信息，所述第一信息用于指示所述隧道信息无效。
可选的，所述处理单元1302具体用于：
确定不能连接到所述隧道信息对应的所述第一用户面网元，则确定所述隧道信息无效。
如图14所示，为本申请实施例提供一种通信装置结构示意图。
该通信装置1400包括：
收发单元，用于从接入网网元接收第一信息，所述第一信息用于指示第一会话的隧道信息无效，所述隧道信息为所述接入网网元与接收到终端的下行数据的第一用户面网元之间隧道的信息；
处理单元，用于收到所述第一信息后，更新所述第一会话的隧道信息。
如图15所示，为本申请实施例提供一种通信装置结构示意图。
该通信装置1500包括：
收发单元1501，用于从会话管理网元接收会话管理信息以及位置区域信息，并确定终端的位置信息；
处理单元1502，用于备根据所述位置区域信息以及所述位置信息确定所述终端位于所述位置区域信息指示的服务区域外；
所述收发单元，用于向所述会话管理网元指示所述会话管理信息未被转发，并触发所述会话管理网元更新所述会话管理信息。
可选的，所述收发单元具体用于：
向所述会话管理网元发送第一消息，所述第一消息指示所述会话管理信息未被转发，并触发所述会话管理网元更新所述会话管理信息。
如图16所示，为本申请实施例提供一种通信装置结构示意图。
该通信装置1600包括：
收发单元1601，用于向移动性管理网元发送会话管理信息以及位置区域信息；从所述移动性管理网元获知：所述会话管理信息未被转发，其中，所述会话管理信息未被转发与所述位置区域信息和终端的位置信息关联；
处理单元1602，用于更新所述会话管理信息。
可选的，所述收发单元1601具体用于：
从所述移动性管理网元接收第一消息，所述第一消息用于指示：更新所述会话管理信息。
可选的，所述第一消息还包括所述位置信息。
可选的，所述位置区域信息包括接收到所述终端的下行数据的第一用户面网元的服务区域的信息。
可选的，更新后的会话管理信息包括为所述终端传输数据的第二用户面网元的信息。
如图17所示，为本申请实施例提供一种通信装置结构示意图。
该通信装置1700包括：
收发单元1701，用于获取终端的位置信息；
处理单元1702，用于根据所述位置信息种确定与所述终端位于所述终端的第一会话对应的用户面网元的服务区域外，根据所述终端的位置信息确定为所述终端传输数据的第二用户面网元。
可选的，收发单元1701具体用于：
收到下行数据通知消息后，向移动性管理网元请求所述终端的位置信息；所述会话管理网元从所述移动性管理网元接收所述终端的位置信息；
处理单元1702具体用于：根据从移动性管理网元接收到的位置信息确定所述终端位于所述终端的第一会话对应的第一用户面网元的服务区域外。
可选的，所述收发单元1701还用于：
向移动性管理网元发送包含所述第二用户面网元对应的第二隧道信息的会话管理信息。
如图18所示，为本申请实施例提供一种通信装置结构示意图。
该通信装置1800包括：
存储器1803，用于存储计算机指令，所述处理器1801用于读取所述存储器1803中的计算机指令。
收发器1802，用于从移动性管理网元接收第一会话的隧道信息；所述隧道信息为所述接入网网元与接收到所述终端的下行数据的第一用户面网元之间隧道的信息；
处理器1801，用于确定所述隧道信息无效，向所述会话管理网元发送第一信息，所述第一信息用于指示所述隧道信息无效。
可选的，所述处理器1801具体用于：
确定不能连接到所述隧道信息对应的所述第一用户面网元，则确定所述隧道信息无效。
如图19所示，为本申请实施例提供一种通信装置结构示意图。
该通信装置1900包括：
存储器1903，用于存储计算机指令，所述处理器1901用于读取所述存储器1903中的计算机指令。
收发器1902，用于从接入网网元接收第一信息，所述第一信息用于指示第一会话的隧道信息无效，所述隧道信息为所述接入网网元与接收到终端的下行数据的第一用户面网元之间隧道的信息；
处理器1901，用于收到所述第一信息后，更新所述第一会话的隧道信息。
如图20所示，为本申请实施例提供一种通信装置结构示意图。
该通信装置2000包括：
存储器2003，用于存储计算机指令，所述处理器2001用于读取所述存储器2003中的计算机指令。
收发器2002，用于从会话管理网元接收会话管理信息以及位置区域信息，并确定终端的位置信息；
处理器2001，用于备根据所述位置区域信息以及所述位置信息确定所述终端位于所述位置区域信息指示的服务区域外；
所述收发器2002，用于向所述会话管理网元指示所述会话管理信息未被转发，并触发 所述会话管理网元更新所述会话管理信息。
可选的，所述收发器具体用于：
向所述会话管理网元发送第一消息，所述第一消息指示所述会话管理信息未被转发，并触发所述会话管理网元更新所述会话管理信息。
如图21所示，为本申请实施例提供一种通信装置结构示意图。
该通信装置2100包括：
存储器2103，用于存储计算机指令，所述处理器2101用于读取所述存储器2103中的计算机指令。
收发器2102，用于向移动性管理网元发送会话管理信息以及位置区域信息；从所述移动性管理网元获知：所述会话管理信息未被转发，其中，所述会话管理信息未被转发与所述位置区域信息和终端的位置信息关联；
处理器2101，用于更新所述会话管理信息。
可选的，所述收发器2102具体用于：
从所述移动性管理网元接收第一消息，所述第一消息用于指示：更新所述会话管理信息。
可选的，所述第一消息还包括所述位置信息。
可选的，所述位置区域信息包括接收到所述终端的下行数据的第一用户面网元的服务区域的信息。
可选的，更新后的会话管理信息包括为所述终端传输数据的第二用户面网元的信息。
如图22所示，为本申请实施例提供一种通信装置结构示意图。
该通信装置2200包括：
存储器2203，用于存储计算机指令，所述处理器2201用于读取所述存储器2203中的计算机指令。
收发器2202，用于获取终端的位置信息；
处理器2201，用于根据所述位置信息种确定与所述终端位于所述终端的第一会话对应的用户面网元的服务区域外，根据所述终端的位置信息确定为所述终端传输数据的第二用户面网元。
可选的，收发器2202具体用于：
收到下行数据通知消息后，向移动性管理网元请求所述终端的位置信息；所述会话管理网元从所述移动性管理网元接收所述终端的位置信息；
处理器2201具体用于：根据从移动性管理网元接收到的位置信息确定所述终端位于所述终端的第一会话对应的第一用户面网元的服务区域外。
可选的，所述收发器2202还用于：
向移动性管理网元发送包含所述第二用户面网元对应的第二隧道信息的会话管理信息。
本申请实施例还提供了一种计算机可读存储介质，用于存储为执行上述处理器所需执行的计算机软件指令，其包含用于执行上述处理器所需执行的程序。
本领域内的技术人员应明白，本申请的实施例可提供为方法、系统、或计算机程序产品。因此，本申请可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本申请可采用在一个或多个其中包含有计算机可用程序代码的计算机 可用存储介质(包括但不限于磁盘存储器、光学存储器等)上实施的计算机程序产品的形式。
本申请是参照根据本申请的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
显然，本领域的技术人员可以对本申请进行各种改动和变型而不脱离本申请的精神和范围。这样，倘若本申请的这些修改和变型属于本申请权利要求及其等同技术的范围之内，则本申请也意图包含这些改动和变型在内。

Claims (30)

  1. 一种通信方法，其特征在于，所述方法包括：
    接入网网元从移动性管理网元接收第一会话的隧道信息；所述隧道信息为所述接入网网元与接收到所述终端的下行数据的第一用户面网元之间隧道的信息；
    所述接入网网元确定所述隧道信息无效，向所述会话管理网元发送第一信息，所述第一信息用于指示所述隧道信息无效。
  2. 根据权利要求1所述的方法，其特征在于，所述接入网网元确定所述隧道信息无效，包括：
    所述接入网网元确定不能连接到所述隧道信息对应的所述第一用户面网元，则确定所述隧道信息无效。
  3. 一种通信方法，其特征在于，所述方法包括：
    会话管理网元从接入网网元接收第一信息，所述第一信息用于指示第一会话的隧道信息无效，所述隧道信息为所述接入网网元与接收到终端的下行数据的第一用户面网元之间隧道的信息；
    所述会话管理网元收到所述第一信息后，更新所述第一会话的隧道信息。
  4. 根据权利要求1至3任一所述的方法，其特征在于，所述第一信息包括所述第一会话的标识和原因值，所述第一会话与所述隧道关联，所述原因值用于指示所述隧道信息无效。
  5. 一种通信方法，其特征在于，所述方法包括：
    移动性管理网元从会话管理网元接收会话管理信息以及位置区域信息，并确定终端的位置信息；
    所述移动性管理网元根据所述位置区域信息以及所述位置信息确定所述终端位于所述位置区域信息指示的服务区域外，向所述会话管理网元指示所述会话管理信息未被转发，并触发所述会话管理网元更新所述会话管理信息。
  6. 根据权利要求5所述的方法，其特征在于，所述移动性管理网元向所述会话管理网元指示所述会话管理信息未被转发，并触发所述会话管理网元更新所述会话管理信息，包括：
    所述移动性管理网元向所述会话管理网元发送第一消息，所述第一消息指示所述会话管理信息未被转发，并触发所述会话管理网元更新所述会话管理信息。
  7. 一种通信方法，其特征在于，所述方法包括：
    会话管理网元向移动性管理网元发送会话管理信息以及位置区域信息；
    所述会话管理网元从所述移动性管理网元获知：所述会话管理信息未被转发，其中，所述会话管理信息未被转发与所述位置区域信息和终端的位置信息关联；
    所述会话管理网元更新所述会话管理信息。
  8. 根据权利要求7所述的方法，其特征在于，所述会话管理网元从所述移动性管理网元获知：更新所述会话管理信息，包括：
    所述会话管理网元从所述移动性管理网元接收第一消息，所述第一消息用于指示：更新所述会话管理信息。
  9. 根据权利要求6或8所述的方法，其特征在于，所述第一消息包括第一信息，所 述第一信息用于指示所述会话管理信息未转发或所述会话管理信息需要更新。
  10. 根据权利要求6或8或9所述的方法，其特征在于，所述第一消息还包括所述位置信息。
  11. 根据权利要求5至10任一所述的方法，其特征在于，所述位置区域信息包括接收到所述终端的下行数据的第一用户面网元的服务区域的信息。
  12. 根据权利要求5至11任一所述的方法，其特征在于，更新后的会话管理信息包括为所述终端传输数据的第二用户面网元的信息。
  13. 一种通信方法，其特征在于，所述方法包括：
    会话管理网元获取终端的位置信息；
    所述会话管理网元根据所述位置信息种确定与所述终端位于所述终端的第一会话对应的用户面网元的服务区域外，根据所述终端的位置信息确定为所述终端传输数据的第二用户面网元。
  14. 根据权利要求13所述的方法，其特征在于，会话管理网元获取终端的位置信息，包括：
    所述会话管理网元收到下行数据通知消息后，向移动性管理网元请求所述终端的位置信息；所述会话管理网元从所述移动性管理网元接收所述终端的位置信息；
    所述会话管理网元根据所述移动属性和位置信息中的至少一种确定所述终端位于所述终端的第一会话对应的第一用户面网元的服务区域外，包括：
    所述会话管理网元根据从移动性管理网元接收到的位置信息确定所述终端位于所述终端的第一会话对应的第一用户面网元的服务区域外。
  15. 根据权利要求13所述的方法，其特征在于，所述会话管理网元根据所述终端的位置信息确定为所述终端传输数据的第二用户面网元之后，所述方法还包括：
    所述会话管理网元向移动性管理网元发送包含所述第二用户面网元对应的第二隧道信息的会话管理信息。
  16. 一种通信装置，其特征在于，所述装置包括：
    收发单元，用于从移动性管理网元接收第一会话的隧道信息；所述隧道信息为所述接入网网元与接收到所述终端的下行数据的第一用户面网元之间隧道的信息；
    处理单元，用于确定所述隧道信息无效，向所述会话管理网元发送第一信息，所述第一信息用于指示所述隧道信息无效。
  17. 根据权利要求16所述的装置，其特征在于，所述处理单元具体用于：
    确定不能连接到所述隧道信息对应的所述第一用户面网元，则确定所述隧道信息无效。
  18. 一种通信装置，其特征在于，所述装置包括：
    收发单元，用于从接入网网元接收第一信息，所述第一信息用于指示第一会话的隧道信息无效，所述隧道信息为所述接入网网元与接收到终端的下行数据的第一用户面网元之间隧道的信息；
    处理单元，用于收到所述第一信息后，更新所述第一会话的隧道信息。
  19. 根据权利要求16至18任一所述的装置，其特征在于，所述第一信息包括所述第一会话的标识和原因值，所述第一会话与所述隧道关联，所述原因值用于指示所述隧道信息无效。
  20. 一种通信装置，其特征在于，所述装置包括：
    收发单元，用于从会话管理网元接收会话管理信息以及位置区域信息，并确定终端的位置信息；
    处理单元，用于备根据所述位置区域信息以及所述位置信息确定所述终端位于所述位置区域信息指示的服务区域外；
    所述收发单元，用于向所述会话管理网元指示所述会话管理信息未被转发，并触发所述会话管理网元更新所述会话管理信息。
  21. 根据权利要求20所述的装置，其特征在于，所述收发单元具体用于：
    向所述会话管理网元发送第一消息，所述第一消息指示所述会话管理信息未被转发，并触发所述会话管理网元更新所述会话管理信息。
  22. 一种通信装置，其特征在于，所述装置包括：
    收发单元，用于向移动性管理网元发送会话管理信息以及位置区域信息；从所述移动性管理网元获知：所述会话管理信息未被转发，其中，所述会话管理信息未被转发与所述位置区域信息和终端的位置信息关联；
    处理单元，用于更新所述会话管理信息。
  23. 根据权利要求22所述的装置，其特征在于，所述收发单元具体用于：
    从所述移动性管理网元接收第一消息，所述第一消息用于指示：更新所述会话管理信息。
  24. 根据权利要求21或23所述的装置，其特征在于，所述第一消息包括第一信息，所述第一信息用于指示所述会话管理信息未转发或所述会话管理信息需要更新。
  25. 根据权利要求21或23或24所述的装置，其特征在于，所述第一消息还包括所述位置信息。
  26. 根据权利要求20至25任一所述的装置，其特征在于，所述位置区域为接收到所述终端的下行数据的第一用户面网元的服务区域。
  27. 根据权利要求20至26任一所述的装置，其特征在于，更新后的会话管理信息包括为所述终端传输数据的第二用户面网元的信息。
  28. 一种通信装置，其特征在于，所述装置包括：
    收发单元，用于获取终端的位置信息；
    处理单元，用于根据所述位置信息种确定与所述终端位于所述终端的第一会话对应的用户面网元的服务区域外，根据所述终端的位置信息确定为所述终端传输数据的第二用户面网元。
  29. 根据权利要求28所述的装置，其特征在于，收发单元具体用于：
    收到下行数据通知消息后，向移动性管理网元请求所述终端的位置信息；所述会话管理网元从所述移动性管理网元接收所述终端的位置信息；
    处理单元具体用于：根据从移动性管理网元接收到的位置信息确定所述终端位于所述终端的第一会话对应的第一用户面网元的服务区域外。
  30. 根据权利要求28所述的装置，其特征在于，所述收发单元还用于：
    向移动性管理网元发送包含所述第二用户面网元对应的第二隧道信息的会话管理信息。
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2022521538A (ja) * 2019-02-22 2022-04-08 華為技術有限公司 データ伝送方法、装置、及びコンピュータ記憶媒体

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018236830A1 (en) * 2017-06-19 2018-12-27 Idac Holdings, Inc. RELOCATION OF USER PLAN
US11224093B2 (en) * 2018-08-13 2022-01-11 Ofinno, Llc Network initiated UPF sessions transfer
CN111436030B (zh) * 2019-01-15 2022-04-05 华为技术有限公司 数据用量上报的方法、装置及系统
EP3922052A1 (en) 2019-02-04 2021-12-15 Nokia Solutions and Networks Oy Prediction and estimation of mobility metric for radio access network optimization
CN112217846B (zh) * 2019-07-10 2023-08-29 大唐移动通信设备有限公司 一种数据传输的方法和装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101499966A (zh) * 2008-01-28 2009-08-05 华为技术有限公司 一种信息处理方法以及服务网关
CN103229534A (zh) * 2011-07-11 2013-07-31 华为技术有限公司 策略控制方法和设备

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101998670A (zh) * 2009-08-25 2011-03-30 华为技术有限公司 家庭基站接入场景下寻呼的处理方法和装置
US20180270896A1 (en) * 2017-03-20 2018-09-20 Qualcomm Incorporated Enhanced session and mobility management interaction for mobile initiated connection only mode user equipments
US10779346B2 (en) * 2017-03-27 2020-09-15 Qualcomm Incorporated Local area data network connectivity

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101499966A (zh) * 2008-01-28 2009-08-05 华为技术有限公司 一种信息处理方法以及服务网关
CN103229534A (zh) * 2011-07-11 2013-07-31 华为技术有限公司 策略控制方法和设备

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
HUAWEI; HISILICON: "TS 23.502: Update of Xn based inter NG RAN handover without user plane function relocation in 4.9.1.1", SA WG2 MEETING #S2-120 S2-172092, no. S2-172092, 21 March 2017 (2017-03-21), Busan, South Korea, XP051249180 *
QUALCOMM INCORPORATED: "23.501 - AMF-SMF implications of optimal UPF placement", SA WG2 MEETING #S2-120 S2-171714, no. S2-171714, 21 March 2017 (2017-03-21), Busan, South Korea, XP051257316 *
See also references of EP3618472A4

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2022521538A (ja) * 2019-02-22 2022-04-08 華為技術有限公司 データ伝送方法、装置、及びコンピュータ記憶媒体
JP7266695B2 (ja) 2019-02-22 2023-04-28 華為技術有限公司 データ伝送方法、装置、及びコンピュータ記憶媒体

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