WO2018036449A1 - 一种数据转发方法及装置 - Google Patents

一种数据转发方法及装置 Download PDF

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Publication number
WO2018036449A1
WO2018036449A1 PCT/CN2017/098278 CN2017098278W WO2018036449A1 WO 2018036449 A1 WO2018036449 A1 WO 2018036449A1 CN 2017098278 W CN2017098278 W CN 2017098278W WO 2018036449 A1 WO2018036449 A1 WO 2018036449A1
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Prior art keywords
access point
wireless access
terminal
forwarding
forwarding tunnel
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PCT/CN2017/098278
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English (en)
French (fr)
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梁爽
高音
朱进国
宗在峰
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中兴通讯股份有限公司
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Publication of WO2018036449A1 publication Critical patent/WO2018036449A1/zh

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  • the present application relates to, but is not limited to, the field of mobile communications, and more particularly to a data forwarding method and apparatus.
  • next generation radio access network multiple wireless networks are supported to access a unified core network, and it is desirable that the radio access network (RAN) and the core network (CN, Core Network) minimize the coupling relationship, that is, regardless of the terminal. Access to the RAN through which access technology can be accessed to the unified CN.
  • the core network function of the next generation network may be different from the existing technology.
  • the existing core network architecture diagram is shown in Figure 1:
  • HSS Home Subscriber Server
  • MME Mobility Management Entity
  • SGSN Serving GPRS Support Node
  • PCRF Policy Charging Rule Function
  • S-GW Service Gateway
  • P-GW Packet Data Gateway
  • PDN Gateway Packet Data Network
  • the home subscriber server is a permanent storage location for the subscriber's subscription data, and is located in the home network to which the subscriber subscribes.
  • the mobility management entity is the storage location of the user subscription data in the current network, responsible for terminal-to-network non-access layer signaling management, terminal security verification function, terminal mobility management, user idle mode tracking and paging. Management functions and bearer management.
  • Serving GPRS Support Node is a Global System for Mobile Communications/Evolved Enhanced Data Rate Radio Access Network (GERAN, GSM/EDGE RAN) and Universal Terrestrial Radio Access Network (UTRAN, UMTS) Terrestrial RAN)
  • GERAN Global System for Mobile Communications/Evolved Enhanced Data Rate Radio Access Network
  • UTRAN Universal Terrestrial Radio Access Network
  • UMTS Universal Terrestrial Radio Access Network
  • the service access point of the user accessing the core network is similar to the mobility management entity, and is responsible for the user's location update, paging management, and bearer management functions.
  • the service gateway is a gateway from the core network to the wireless system, and is responsible for the user plane bearer of the terminal to the core network, the data buffer in the terminal idle mode, the function of initiating a service request by the network side, the lawful interception and the packet data routing and forwarding function; the service gateway It is responsible for counting the situation in which the user terminal uses the wireless network, and generates a CDR that the terminal uses the wireless network to transmit to the charging gateway.
  • the packet data gateway is a gateway of the evolved system and the external packet data network of the system. It is connected to the Internet and the packet data network, and is responsible for the Internet Protocol (IP) address allocation, charging function, packet filtering, and policy of the terminal. Control and other functions.
  • IP Internet Protocol
  • the packet data network is an operator's IP service network, which provides IP services to users through the carrier's core network.
  • the policy charging rule function entity is a server in the evolution system responsible for providing rules for charging control, online credit control, threshold control, and quality of service (QoS) policies.
  • the next generation network further integrates and optimizes the network functions.
  • the schematic diagram of the architecture is shown in Figure 2:
  • the core network includes a Control Plane (CP) functional entity and a User Plane (UP) functional entity, and these functional entities may be multiple.
  • the CP functional entity may be divided into a mobility management entity, a session management entity, an address assignment entity, a QoS policy formulation entity, and the like according to the managed content.
  • the UP function entity may be one or more functional entities that forward data. If there are multiple CP functional entities, there may be a unique interface to the access network (AN, Access Network), or there may be multiple interfaces to the AN. For the former, when other CP functional entities that do not have an interface with the AN need to deliver the relevant parameters to the AN, they can be forwarded through the CP functional entity with the interface.
  • AN supports multiple access networks in next-generation networks, where AN is collectively referred to.
  • AN is collectively referred to.
  • the interfaces and protocol types of the CP functional entities of the CN that may be connected are different.
  • the management efficiency is low, because the location of the network element performing mobility management is high, so it is used.
  • the user needs to notify the network that the path experienced by the network is long, so there is a problem that the path is not optimized enough.
  • the terminal needs to have a more complicated process to recover from the idle state of not transmitting data to the connection state of sending data.
  • FIG. 3 The network architecture diagram of the embodiment of the present invention is shown in FIG. 3, and the network deployment diagram is shown in FIG. 4. among them:
  • the CN Common CP includes functions for implementing MM (Mobility Management).
  • the RAN anchor node on the RAN side is responsible for mobility management of the RAN within the coverage of the RAN anchor.
  • the RAN anchor node can be set up with the RAN node and also set separately from the RAN node.
  • the Mobility Management Function (MMF) of the core network is responsible for a wider range of mobility management and is a control plane entity.
  • the SMF-C (Session Management Function-Control plane) of the session management function of the core network is responsible for establishing, modifying, and deleting the data connection of the terminal, and is responsible for selecting the user plane function of the appropriate session management function (SMF-U, The Session Management Function-User plane) delivers data to the terminal and sends the data connection information to the corresponding SMF-U.
  • SMF-U Session Management Function-Control plane
  • the air interface connection between the RAN and the terminal can be released to save resources.
  • the RAN pages the terminal and resumes the air interface connection.
  • the core network believes that the terminal is always connected, thereby achieving the purpose of quickly recovering the data connection.
  • the terminal since the terminal may leave the coverage of the RAN anchor without an air interface connection, when the downlink data arrives, it cannot Notifying the terminal that the downlink data is unreachable.
  • the embodiment of the invention provides a data forwarding method and device.
  • the core network element When it is determined that the terminal accesses the target wireless access point, the core network element sends a message for notifying the establishment of the forwarding tunnel to the target wireless access point and the source wireless access point.
  • the source wireless access point After receiving the paging stop message sent by the core network element, the source wireless access point determines whether a forwarding tunnel needs to be established for the terminal.
  • a forwarding tunnel establishment request is sent to the core network element
  • the forwarding tunnel After receiving the forwarding tunnel establishment complete message sent by the core network element, the forwarding tunnel is used to forward the terminal resource.
  • the notification unit is configured to send, when the terminal accesses the target wireless access point, a message for notifying the establishment of the forwarding tunnel to the target wireless access point and the source wireless access point.
  • a determining unit configured to: after the source wireless access point receives the paging stop message sent by the core network element, determine whether a forwarding tunnel needs to be established for the terminal;
  • a sending unit configured to send a forwarding tunnel establishment request to the core network element when a forwarding tunnel needs to be established for the terminal
  • the forwarding unit is configured to forward the terminal resource by using the established forwarding tunnel after receiving the forwarding tunnel establishment complete message sent by the core network element.
  • the embodiment of the invention further provides a computer readable storage medium storing computer executable instructions, the computer executable instructions being implemented by the processor to implement the data forwarding method.
  • the core network element when determining that the terminal accesses the target wireless access point, the core network element sends a notification to the target wireless access point and the source wireless access point to notify the establishment of the forwarding tunnel. interest.
  • the source wireless access point determines whether a forwarding tunnel needs to be established for the terminal; when the forwarding tunnel is established for the terminal, the forwarding tunnel is established to be sent to the core network element.
  • the terminal After receiving the forwarding tunnel establishment complete message sent by the core network element, the terminal uses the established forwarding tunnel to forward the terminal resource. In this way, when the terminal does not have an air interface connection, when the coverage of the RAN anchor is left, the terminal can still notify the terminal when the downlink data arrives, so that the downlink data is reachable.
  • FIG. 1 is a schematic structural diagram of an evolved packet domain system.
  • Figure 2 is a schematic diagram of the architecture of the next generation network.
  • Figure 3 is a schematic diagram of the improved network architecture.
  • FIG. 4 is a schematic diagram of network deployment based on the architecture of FIG. 3;
  • FIG. 5 is a schematic flowchart 1 of a data forwarding method according to an embodiment of the present invention.
  • FIG. 6 is a second schematic flowchart of a data forwarding method according to an embodiment of the present invention.
  • FIG. 7 is a flowchart 1 of a forwarding path establishment according to an embodiment of the present invention.
  • FIG. 10 is a first schematic structural diagram of a data forwarding device according to an embodiment of the present invention.
  • FIG. 11 is a second schematic structural diagram of a data forwarding apparatus according to an embodiment of the present invention.
  • FIG. 5 is a schematic flowchart of a data forwarding method according to an embodiment of the present invention.
  • the data forwarding method in this example is applied to a core network side.
  • the target wireless access point in this example refers to a wireless access point newly accessed by the terminal.
  • a source wireless access point refers to a wireless access point that suspends terminal resources, also called The old wireless access point; as shown in FIG. 5, the data forwarding method includes the following steps:
  • Step 501 When determining that the terminal accesses the target wireless access point, the core network element sends a message for notifying the establishment of the forwarding tunnel to the target wireless access point and the source wireless access point.
  • the method further includes:
  • the core network element After receiving the indication of establishing a forwarding tunnel sent by the source wireless access point, the core network element instructs the target wireless access point to establish a forwarding tunnel; and sends forwarding tunnel information to the source wireless access point.
  • the method further includes:
  • the core network element When the downlink data for the terminal is reached, the core network element sends a page to the terminal by using multiple wireless access points;
  • a wireless access point that is paged to the terminal is used as the target wireless access point.
  • the method further includes:
  • the core network element After the source wireless access point determines that the direct forwarding tunnel or the indirect forwarding tunnel is established, the core network element receives the determination result sent by the source wireless access point.
  • the method further includes:
  • the core network element After the target wireless access point determines that the direct forwarding tunnel or the indirect forwarding tunnel is established, the core network element receives the determination result sent by the target wireless access point.
  • the indication message also carries the RAN context of the terminal, and the RAN context is transparently transmitted to the target RAN node by the core network element.
  • the core network element determines, according to the determination result, that the core network forwards the tunnel information when establishing the indirect forwarding tunnel.
  • FIG. 6 is a schematic flowchart 2 of a data forwarding method according to an embodiment of the present invention.
  • the target wireless access point in this example refers to the wireless access point newly accessed by the terminal
  • the source wireless access point refers to the wireless access point in which the terminal resource is suspended.
  • the data forwarding method includes the following steps:
  • Step 601 After receiving the paging stop message sent by the core network element, the source wireless access point determines whether a forwarding tunnel needs to be established for the terminal.
  • Step 602 When a forwarding tunnel needs to be established for the terminal, a forwarding tunnel establishment request is sent to the core network element.
  • Step 603 After receiving the forwarding tunnel establishment complete message sent by the core network element, use the established forwarding tunnel to forward the terminal resource.
  • the source wireless access point determines whether a forwarding tunnel needs to be established for the terminal, it is also determined whether to establish an indirect forwarding tunnel or directly forward the tunnel.
  • the data forwarding method further includes: after receiving the forwarding tunnel message sent by the core network element, the source wireless access point uses the established forwarding tunnel to forward the terminal resource, and forwards the terminal resource. After the completion, the forwarding tunnel is released, and the core network element is notified.
  • the message between the MMF and the RAN anchor in FIG. 7 to FIG. 9 may be a message described in the figure, that is, the corresponding parameter is transmitted by using some messages, or other suitable messages may be used, or a new message may be added as long as it is Ability to pass the required information and trigger the appropriate process.
  • FIG. 7 is a flow 1 of the forwarding path establishment when data is restored based on the architecture of FIG. 3. As shown in FIG. 7, the process includes:
  • Step 701 The downlink data arrives at the source RAN, and the RAN triggers paging. If the control plane and the user plane implemented on the RAN side are separated, the downlink data is buffered on the user plane, thereby triggering the control plane to perform paging.
  • the RAN anchor triggers paging within its own coverage.
  • Steps 702-703 When the RAN anchor node triggers paging, it notifies the core network MMF that downlink data arrives, and the MMF can page the terminal in a larger range.
  • the MMF determines the paging range based on the range of location updates assigned to the terminal. May need to send homing to multiple RAN anchors call.
  • Step 704 Assume that the terminal is paged to the coverage of the target RAN Anchor.
  • Step 705 The terminal initiates a service request or a data service recovery request, requesting to restore the data connection.
  • the terminal receives the paging message, it can compare the RAN anchor range that was previously camped with the RAN anchor information of the new cell to determine the originating service request, instead of the data service.
  • the terminal may always initiate a data service recovery request, where the terminal carries a temporary identifier allocated by the network side for the terminal.
  • the target RAN Anchor forwards it to the mobility management unit of the core network. In different architectures, it may be sent to other core network elements and forwarded to the mobile management function.
  • the target RAN anchor determines that it needs to be forwarded to the core network according to information that is not available for restoring data locally.
  • the target RAN anchor finds the core network element where the terminal is located according to the temporary identifier carried by the terminal, and generates a data service recovery request.
  • Step 706 The MMF compares the information of the previously saved source RAN anchor with the information of the target RAN anchor in step 705, determines that the terminal moves to the new RAN anchor area, and there may be cached data at the source RAN anchor.
  • Step 707 If the process is triggered by paging, the MMF notifies the source RAN anchor to stop paging, and instructs the terminal to access from the new RAN anchor, which carries the information of the target RAN anchor. If there is no paging trigger, but the terminal accesses from the new access point, the MMF notifies the source RAN anchor node that the terminal accesses from the new RAN anchor node and carries the information of the target RAN anchor node.
  • the source RAN anchor determines whether data forwarding is required, and determines whether a direct or indirect forwarding tunnel can be established.
  • Step 708 The source RAN anchor returns a forwarding tunnel establishment request, where the direct forwarding or indirect forwarding indication is carried.
  • the message may further include a RAN context of the terminal, which may be transparently transmitted to the target RAN anchor node by the MMF in step 709.
  • Step 709 According to the indication in step 708, if an indirect forwarding tunnel needs to be established, the MMF notifies the SMF-C to establish an indirect forwarding tunnel, and the SMF-C selects an appropriate SMF-U as the indirect forwarding, and the established forwarding tunnel identifier and address are established. The assignment is returned to MMF. If the indirect forwarding tunnel is established, the process of the MMF notifying the SMF-C may be performed after the step 511, that is, after the forwarding tunnel information of the target RAN anchor has been acquired, the signaling interaction is reduced.
  • the MMF sends a UE context setup request to the target RAN anchor, which carries the tunnel segment identifier and address of the core network, and the session and security context of the terminal, and indicates that the target RAN anchor needs to establish a data forwarding tunnel.
  • Step 710 The target RAN anchor saves the context of the terminal, and establishes a corresponding wireless connection according to the context of the terminal.
  • Step 711 The target RAN anchor returns a context establishment response, and returns related information of the data forwarding, the tunnel segment identifier and the IP address according to the indication.
  • Step 712 The MMF returns a forwarding tunnel establishment response to the source RAN anchor.
  • the data forwarding tunnel information returned by the target RAN anchor needs to be sent to the SMF-C, and the SMF-C sends it to the SMF-U participating in the indirect forwarding.
  • the MMF carries the tunnel information of the SMF-U participating in the indirect forwarding in the forwarding tunnel establishment response message.
  • the MMF carries the forwarding tunnel information returned by the target RAN anchor in the forwarding tunnel establishment response message.
  • Step 713 The source RAN anchor may explicitly release the connection with the core network after the data forwarding ends.
  • the timer can also be used. After the timer expires, the source RAN anchor and the core network participate in the data forwarding network element, and release the corresponding forwarding resources.
  • FIG. 8 is a flow 2 of the forwarding path establishment when data is restored based on the architecture of FIG. 3. As shown in FIG. 8, the process includes:
  • Step 801 The downlink data arrives at the source RAN, and the RAN triggers paging. If the control plane and the user plane implemented on the RAN side are separated, the downlink data is buffered on the user plane, thereby triggering the control plane to perform paging.
  • the RAN anchor triggers paging within its own coverage.
  • Steps 802 to 803 When the RAN anchor node triggers paging, it notifies the core network MMF that downlink data arrives, and the MMF can page the terminal in a larger range.
  • the MMF determines the paging range based on the range of location updates assigned to the terminal. It may be necessary to send a page to multiple RAN anchors.
  • Step 804 Assume that the terminal is paged to the coverage of the target RAN Anchor.
  • Step 805 The terminal initiates a service request or a data service recovery request, and requests to restore the data connection.
  • the terminal receives the paging message, it can compare the RAN anchor range that was previously camped with the RAN anchor information of the new cell to determine the originating service request, instead of the data service.
  • the terminal may always initiate a data service recovery request, where the terminal carries a temporary identifier allocated by the network side for the terminal.
  • the target RAN Anchor forwards it to the mobility management unit of the core network. In different architectures, it may be sent to other core network elements and forwarded to the mobile management function.
  • the target RAN anchor determines that it needs to be forwarded to the core network according to information that is not available for restoring data locally.
  • the target RAN anchor finds the core network element where the terminal is located according to the temporary identifier carried by the terminal, and generates a data service recovery request.
  • forwarding tunnel information may be carried in the message.
  • Step 806 The MMF compares the information of the previously saved source RAN anchor with the information of the target RAN anchor in step 805, determines that the terminal has moved to the new RAN anchor area, and there may be cached data at the source RAN anchor.
  • Step 807 If the process is triggered by paging, the MMF notifies the source RAN anchor to stop paging, and instructs the terminal to access from the new RAN anchor, which carries the information of the target RAN anchor.
  • the source RAN anchor determines whether data forwarding is required, and determines whether a direct or indirect forwarding tunnel can be established.
  • the MMF If there is no paging trigger, but the terminal accesses from the new access point, the MMF notifies the source RAN anchor node that the terminal accesses from the new RAN anchor node and carries the target RAN anchor. Node information.
  • Step 808 The source RAN anchor returns a forwarding tunnel establishment request, where the direct forwarding or indirect forwarding indication is carried.
  • the message may further include a RAN context of the terminal, which may be transparently transmitted to the target RAN anchor node by the MMF in step 809.
  • Step 809 The MMF sends a UE context setup request to the target RAN anchor, where the tunnel segment identifier and address of the core network, and the session and security context of the terminal are carried.
  • Step 810 The target RAN anchor saves the context of the terminal, and establishes a corresponding wireless connection according to the context of the terminal.
  • Step 811 The target RAN anchor returns a context establishment response, and returns related information of the data forwarding, the tunnel segment identifier and the IP address according to the indication.
  • Step 812 The MMF returns a forwarding tunnel establishment response to the source RAN anchor.
  • the MMF if an indirect forwarding tunnel is established, the MMF notifies the SMF-C to establish an indirect forwarding tunnel, and sends the forwarding tunnel information of the current RAN anchor received in step 805 to the SMF-C, and the SMF-C selects The appropriate SMF-U is forwarded indirectly, and the established forwarding tunnel identity and address assignment are returned to the MMF, and the MMF sends the forwarding tunnel identifier and address to the source RAN anchor. If the direct forwarding tunnel is established, the MMF sends the forwarding data tunnel information of the target RAN anchor received in step 805 to the source RAN anchor.
  • This step can be performed immediately after step 808.
  • Step 813 The source RAN anchor may explicitly release the connection with the core network after the data forwarding ends.
  • the timer can also be used. After the timer expires, the source RAN anchor and the core network participate in the data forwarding network element, and release the corresponding forwarding resources.
  • FIG. 9 is a flowchart 3 of the forwarding path establishment when data is restored based on the architecture of FIG. 3. As shown in FIG. 9, the process includes:
  • Step 901 The downlink data arrives at the source RAN, and the RAN triggers paging. If the control plane and the user plane implemented on the RAN side are separated, the downlink data is buffered on the user plane, thereby triggering the control plane to perform paging.
  • the RAN anchor triggers paging within its own coverage.
  • Steps 902 to 903 When the RAN anchor node triggers paging, the core network MMF is notified. When the line data arrives, the MMF can page the terminal in a larger range. The MMF determines the paging range based on the range of location updates assigned to the terminal. It may be necessary to send a page to multiple RAN anchors.
  • Step 904 Assume that the terminal is paged to the coverage of the target RAN Anchor.
  • Step 905 The terminal initiates a service request or a data service recovery request, requesting to restore the data connection.
  • the terminal receives the paging message, it can compare the RAN anchor range that was previously camped with the RAN anchor information of the new cell to determine the originating service request, instead of the data service.
  • the terminal may always initiate a data service recovery request, where the terminal carries a temporary identifier allocated by the network side for the terminal.
  • the target RAN Anchor forwards it to the mobility management unit of the core network. In different architectures, it may be sent to other core network elements and forwarded to the mobile management function.
  • the target RAN anchor determines that it needs to be forwarded to the core network according to information that is not available for restoring data locally.
  • the target RAN anchor finds the core network element where the terminal is located according to the temporary identifier carried by the terminal, and generates a data service recovery request.
  • the message sent by the source RAN anchor to the MMF may further include the RAN context of the terminal, which may be transparently transmitted to the target RAN anchor node by the MMF in step 907.
  • Step 906 The MMF compares the information of the previously saved source RAN anchor with the information of the target RAN anchor in step 905, determines that the terminal has moved to the new RAN anchor area, and there may be cached data at the source RAN anchor.
  • Step 907 The MMF sends a UE context setup request to the target RAN anchor, where the tunnel segment identifier and address of the core network, and the session, security context of the terminal, and related information of the source RAN anchor or the source access base station are carried.
  • Step 908 The target RAN anchor saves the context of the terminal and establishes a corresponding wireless connection according to the context of the terminal.
  • Step 909 The target RAN anchor returns a context establishment response.
  • the target RAN anchor determines direct forwarding or indirect forwarding according to the source side information carried in step 907, and responds to the message.
  • Inform MMF The message also carries information about data forwarding: tunnel segment identifier and IP address.
  • Step 910 The MMF sends a forwarding tunnel establishment request to the source RAN anchor.
  • the MMF notifies the SMF-C to establish an indirect forwarding tunnel, and the SMF-C selects an appropriate SMF-U as the indirect forwarding, and returns the established forwarding tunnel identifier and address allocation to the MMF.
  • the MMF sends the data forwarding tunnel information returned by the target RAN anchor to the SMF-C, which sends it to the SMF-U participating in the indirect forwarding.
  • the MMF carries the tunnel information of the SMF-U participating in the indirect forwarding in the forwarding tunnel establishment request message.
  • the MMF carries the forwarding tunnel information returned by the target RAN anchor in the forwarding tunnel establishment request message.
  • Step 911 The source RAN anchor may explicitly release the connection with the core network after the data forwarding ends.
  • the timer can also be used. After the timer expires, the source RAN anchor and the core network participate in the data forwarding network element, and release the corresponding forwarding resources.
  • Step 905 The service recovery message initiated by the terminal carries information of the source RAN anchor node or the source RAN node, for example, the information of the source base station is included in the recovery ID.
  • the target RAN anchor judges to perform indirect or direct forwarding based on this information.
  • the data recovery request sent to the MMF carries the tunnel information of the forwarding data, including the tunnel end identifier and the address information. It also includes indirect forwarding or direct forwarding instructions.
  • the MMF does not need to perform step 910 after step 909, but steps 910-911 can be performed simultaneously with steps 907-909, thereby speeding up data recovery.
  • FIG. 10 is a first schematic structural diagram of a data forwarding device according to an embodiment of the present invention. As shown in FIG. 10, the device includes:
  • the notification unit 11 is configured to send a message for notifying the establishment of the forwarding tunnel to the target wireless access point and the source wireless access point when determining that the terminal accesses the target wireless access point.
  • the notification unit 11 is further configured to: after receiving the indication of establishing a forwarding tunnel sent by the source wireless access point, instructing the target wireless access point to establish a forwarding tunnel; and to the source wireless access point Send forwarding tunnel information.
  • the device also includes:
  • the paging unit 12 is configured to, when the downlink data for the terminal is reached, initiate paging to the terminal by using multiple wireless access points; and use the wireless access point that is paged to the terminal as the target wireless Access Point.
  • the notification unit 11 is further configured to notify the source wireless access point of node information of the target wireless access point; and after the source wireless access point determines that a direct forwarding tunnel or an indirect forwarding tunnel is established, receiving The judgment result sent by the source wireless access point.
  • the notification unit 11 receives the judgment result by means of an indication message; the indication message further carries a RAN context of the terminal, and the RAN context is transparently transmitted to the target RAN node by the core network element.
  • the notification unit 11 is further configured to notify the target wireless access point of node information of the source wireless access point; and when the target wireless access point determines that a direct forwarding tunnel or an indirect forwarding tunnel is established, receiving a determination result sent by the target wireless access point.
  • the device also includes:
  • the allocating unit 13 is configured to, according to the determination result, determine that the core network forwards the tunnel information when establishing the indirect forwarding tunnel.
  • FIG. 11 is a second structural diagram of a data forwarding device according to an embodiment of the present invention. As shown in FIG. 11, the device includes:
  • the determining unit 21 is configured to: after the source wireless access point receives the paging stop message sent by the core network element, determine whether a forwarding tunnel needs to be established for the terminal;
  • the sending unit 22 is configured to send a forwarding tunnel establishment request to the core network element when a forwarding tunnel needs to be established for the terminal;
  • the forwarding unit 23 is configured to perform forwarding of the terminal resource by using the established forwarding tunnel after receiving the forwarding tunnel establishment complete message sent by the core network element.
  • the determining unit 21 is further configured to determine whether to establish an indirect forwarding tunnel or directly forward the tunnel when the forwarding tunnel needs to be established for the terminal.
  • the embodiment of the invention further provides a computer readable storage medium storing computer executable instructions, which are implemented by the processor to implement the data forwarding method as described in FIG. 5 .
  • the embodiment of the invention further provides a computer readable storage medium storing computer executable instructions, which are implemented by the processor to implement the data forwarding method as described in FIG. 6 .
  • the disclosed method and smart device may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner such as: multiple units or components may be combined, or Can be integrated into another system, or some features can be ignored or not executed.
  • the coupling, or direct coupling, or communication connection of the components shown or discussed may be indirect coupling or communication connection through some interfaces, devices or units, and may be electrical, mechanical or other forms. of.
  • the units described above as separate components may or may not be physically separated, and the components displayed as the unit may or may not be physical units, that is, may be located in one place or distributed to multiple network units; Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in each embodiment of the present invention may be integrated into one second processing unit, or each unit may be separately used as one unit, or two or more units may be integrated into one unit;
  • the above integrated unit can be implemented in the form of hardware or in the form of hardware plus software functional units.

Abstract

一种数据转发方法及装置，包括：确定终端接入至目标无线接入点时，核心网网元向所述目标无线接入点以及源无线接入点发送用于通知建立转发隧道的消息。源无线接入点接收核心网网元发送的寻呼停止消息后，确定是否需为所述终端建立转发隧道；需为所述终端建立转发隧道时，向所述核心网网元发送转发隧道建立请求；在接收到所述核心网网元发送的转发隧道建立完成消息后，利用所建立的转发隧道进行终端资源的转发。

Description

一种数据转发方法及装置 技术领域
本申请涉及但不限于移动通信领域，尤指一种数据转发方法及装置。
背景技术
为了保持第三代移动通信系统在通信领域的竞争力，为用户提供更快速率、低时延更、更加个性化的移动通信服务，同时，降低运营商的运营成本，第三代合作伙伴计划(3GPP，3rd Generation Partnership Project)标准工作组正致力于下一代无线移动接入网的研究。下一代无线接入网中，支持多种无线网络接入统一的核心网，并且希望无线接入网(RAN，Radio Access Network)和核心网(CN，Core Network)尽量减少耦合关系，即不管终端通过何种接入技术接入RAN，都可以接入到统一的CN中去。下一代网络的核心网功能可能与已有技术有很多不同，其中已有的核心网架构图如图1所示：
在核心网中，包含了归属用户服务器(HSS，Home Subscriber Server)、移动性管理实体(MME，Mobility Management Entity)、服务GPRS支持节点(SGSN，Serving GPRS Support Node)、策略计费规则功能(PCRF，Policy and Charging Rule Function)、服务网关(S-GW，Serving Gateway)、分组数据网关(P-GW，PDN Gateway)和分组数据网络(Packet Data Network)。下面详细说明各部分功能：
归属用户服务器，是用户签约数据的永久存放地点，位于用户签约的归属网。
移动性管理实体，是用户签约数据在当前网络的存放地点，负责终端到网络的非接入层信令管理、终端的安全验证功能、终端的移动性管理、用户空闲模式下的跟踪和寻呼管理功能和承载管理。
服务GPRS支持节点，是全球移动通信系统/演进增强数据速率无线接入网(GERAN，GSM/EDGE RAN)和通用地面无线接入网(UTRAN，UMTS  Terrestrial RAN)用户接入核心网络的业务支持点，功能上与移动性管理实体类似，负责用户的位置更新、寻呼管理和承载管理等功能。
服务网关，是核心网到无线系统的网关，负责终端到核心网的用户面承载、终端空闲模式下的数据缓存、网络侧发起业务请求的功能、合法监听和分组数据路由和转发功能；服务网关负责统计用户终端使用无线网的情况，并产生终端使用无线网的话单，传送给计费网关。
分组数据网关，是演进系统和该系统外部分组数据网络的网关，它连接到因特网和分组数据网络上，负责终端的互联网协议(IP，Internet Protocol)地址分配、计费功能、分组包过滤、策略控制等功能。
分组数据网络，是运营商的IP业务网络，该网络通过运营商的核心网为用户提供IP服务。
策略计费规则功能实体，是演进系统中负责提供计费控制、在线信用控制、门限控制、服务质量(QoS，Quality of Service)策略方面规则的服务器。
下一代网络对网络功能进一步进行整合优化，其架构示意图如图2所示：
核心网包括控制面(CP，Control Plane)功能实体和用户面(UP，User Plane)功能实体，而这些功能实体可以是多个。其中，CP功能实体可以根据所管理的内容划分为移动管理实体、会话管理实体、地址分配实体、QoS策略制定实体等等。其中UP功能实体可以是对数据转发的一个或者多个功能实体。如果存在多个CP功能实体，则可能有唯一的对接入网(AN，Access Network)的接口，也可能有多个对AN的接口。对于前者，当其他与AN没有接口的CP功能实体需要下发相关参数给AN时，可以通过有接口的CP功能实体转发。
AN在下一代网络中支持多种接入网，这里以AN作为统称。对于不同的接入点，可能连接的CN的CP功能实体的接口和协议类型都有所不同。
但是由于现在移动管理都在核心网进行管理，因此具有如下缺陷：
1、管理效率较低，由于执行移动性管理的网元位置较高，因此造成用 户在发生移动性的时候需要通知网络所经历的路径较长，因此存在路径不够优化的问题。
2、终端从不发送数据的空闲态到需要发送数据的连接态需要有比较复杂的流程进行恢复。
为了实现更有效率的移动性管理，将部分的移动管理的功能下移到RAN中。因此，在RAN侧引入移动管理的部分功能。本发明实施例的网络架构图如图3所示，网络部署图如图4所示。其中：
CN公共(Common)CP包括实现MM(移动性管理，Mobility Management)的功能。
RAN侧的RAN锚(RAN anchor)节点负责RAN在RAN anchor覆盖范围内的移动性管理。RAN anchor节点，可以与RAN node合设，也与RAN node分开设置。
核心网的移动性管理功能(MMF，Mobility Management Function)，负责更大范围的移动性管理，是控制面实体。
核心网的会话管理功能的控制面功能(SMF-C，Session Management Function-Control plane)，负责终端的数据连接建立、修改和删除，负责选择合适的会话管理功能的用户面功能(SMF-U，Session Management Function-User plane)为终端投递数据，并将数据连接的信息发送给相应的SMF-U。
发明概述
以下是对本文详细描述的主题的概述。本概述并非是为了限制权利要求的保护范围。
在上述架构中，当终端(UE，User Equipment)没有数据传输的时候，可以释放RAN和终端的空口连接以节约资源。下行数据到达时候，RAN寻呼终端，恢复空口连接。这样，核心网则认为终端一直在连接状态，从而达到快速恢复数据连接的目的。但是，由于终端可能在没有空口连接的情况下，离开RAN anchor的覆盖范围，这样当下行数据到达的时候，就无法 通知到终端，造成下行数据不可达。
本发明实施例提供了一种数据转发方法及装置。
本发明实施例提供的数据转发方法，包括：
确定终端接入至目标无线接入点时，核心网网元向所述目标无线接入点以及源无线接入点发送用于通知建立转发隧道的消息。
本发明另一实施例提供的数据转发方法，包括：
源无线接入点接收核心网网元发送的寻呼停止消息后，确定是否需为所述终端建立转发隧道；
需为所述终端建立转发隧道时，向所述核心网网元发送转发隧道建立请求；
在接收到所述核心网网元发送的转发隧道建立完成消息后，利用所建立的转发隧道进行终端资源的转发。
本发明实施例提供的数据转发装置，包括：
通知单元，设置为确定终端接入至目标无线接入点时，向所述目标无线接入点以及源无线接入点发送用于通知建立转发隧道的消息。
本发明另一实施例提供的数据转发装置，包括：
确定单元，设置为当源无线接入点接收核心网网元发送的寻呼停止消息后，确定是否需为所述终端建立转发隧道；
发送单元，设置为当需为所述终端建立转发隧道时，向所述核心网网元发送转发隧道建立请求；
转发单元，设置为在接收到所述核心网网元发送的转发隧道建立完成消息后，利用所建立的转发隧道进行终端资源的转发。
本发明实施例还提供一种计算机可读存储介质，存储有计算机可执行指令，所述计算机可执行指令被处理器执行时实现上述数据转发方法。
本发明实施例中，确定终端接入至目标无线接入点时，核心网网元向所述目标无线接入点以及源无线接入点发送用于通知建立转发隧道的消 息。源无线接入点接收核心网网元发送的寻呼停止消息后，确定是否需为所述终端建立转发隧道；需为所述终端建立转发隧道时，向所述核心网网元发送转发隧道建立请求；在接收到所述核心网网元发送的转发隧道建立完成消息后，利用所建立的转发隧道进行终端资源的转发。如此，当终端没有空口连接的情况下，离开RAN anchor的覆盖范围时，下行数据到达的时仍可以通知到终端，从而使得下行数据可达。
在阅读并理解了附图和详细描述后，可以明白其他方面。
附图概述
图1为演进分组域系统的结构示意图。
图2为下一代网络的架构示意图。
图3为改进后的网络架构示意图。
图4为基于图3的架构下的网络部署示意图；
图5为本发明实施例的数据转发方法的流程示意图一；
图6为本发明实施例的数据转发方法的流程示意图二；
图7本发明实施例的转发路径建立的流程一；
图8是本发明实施例的转发路径建立的流程二；
图9是本发明实施例的转发路径建立的流程三；
图10为本发明实施例的数据转发装置的结构组成示意图一；
图11为本发明实施例的数据转发装置的结构组成示意图二。
详述
为了能够更加详尽地了解本发明实施例的特点与技术内容，下面结合附图对本发明实施例的实现进行详细阐述。
图5为本发明实施例的数据转发方法的流程示意图一，本示例中的数据转发方法应用于核心网侧，本示例中的目标无线接入点是指终端新接入的无线接入点，源无线接入点是指挂起了终端资源的无线接入点，也称为 旧的无线接入点；如图5所示，所述数据转发方法包括以下步骤：
步骤501：确定终端接入至目标无线接入点时，核心网网元向所述目标无线接入点以及源无线接入点发送用于通知建立转发隧道的消息。
本发明实施例中，所述方法还包括：
所述核心网网元接收到源无线接入点发送的建立转发隧道的指示后，指示所述目标无线接入点建立转发隧道；向所述源无线接入点发送转发隧道信息。
本发明实施例中，所述方法还包括：
当针对所述终端的下行数据达到时，所述核心网网元通过多个无线接入点向所述终端发起寻呼；
将寻呼到所述终端的无线接入点作为所述目标无线接入点。
本发明实施例中，所述方法还包括：
所述核心网网元向所述源无线接入点通知所述目标无线接入点的节点信息；
当所述源无线接入点判断出建立直接转发隧道或者间接转发隧道后，所述核心网元接收所述源无线接入点发送的判断结果。
本发明实施例中，所述方法还包括：
所述核心网网元向所述目标无线接入点通知所述源无线接入点的节点信息；
当所述目标无线接入点判断出建立直接转发隧道或者间接转发隧道后，所述核心网元接收所述目标无线接入点发送的判断结果。
所述核心网元通过指示消息的方式接收所述判断结果；
所述指示消息还携有终端的RAN上下文，所述RAN上下文通过所述核心网网元透传给目标RAN节点。
本发明实施例中，所述核心网网元根据所述判断结果，确定建立间接转发隧道时，分配核心网转发隧道信息。
图6为本发明实施例的数据转发方法的流程示意图二，本示例中的数 据转发方法应用于源无线接入点侧，本示例中的目标无线接入点是指终端新接入的无线接入点，源无线接入点是指挂起了终端资源的无线接入点，也称为旧的无线接入点；如图6所示，所述数据转发方法包括以下步骤：
步骤601：源无线接入点接收核心网网元发送的寻呼停止消息后，确定是否需为所述终端建立转发隧道。
步骤602：需为所述终端建立转发隧道时，向所述核心网网元发送转发隧道建立请求。
步骤603：在接收到所述核心网网元发送的转发隧道建立完成消息后，利用所建立的转发隧道进行终端资源的转发。
本发明实施例中，所述源无线接入点确定是否需为所述终端建立转发隧道时，还确定建立间接转发隧道还是直接转发隧道。
在本发明另一实施方式中，数据转发方法还包括：源无线接入点接收核心网网元发送的转发隧道消息后，利用所建立的转发隧道进行终端资源的转发，在所述终端资源转发完毕后，释放所述转发隧道，并通知所述核心网网元。
下面结合应用场景对本发明实施例的数据转发方法做进一步详细描述。
图7～图9中的MMF和RAN anchor之间的消息，可以是图中描述的消息，即利用某些消息传递相应的参数，也可以是其他合适的消息，或者是新增消息，只要是能够传递所需要的信息，并触发相应的流程即可。
图7是基于图3的架构下，数据恢复时，转发路径建立的流程一。如图7所示，所述流程包括：
步骤701：下行数据到达源RAN，RAN触发寻呼。如果RAN侧实现的控制面和用户面分离，下行数据缓存在用户面，从而触发控制面进行寻呼。RAN anchor在自身的覆盖范围内触发寻呼。
步骤702～703：RAN anchor节点触发寻呼的同时，通知核心网MMF下行数据到达，MMF可以在更大的范围内寻呼终端。MMF根据为终端分配的位置更新的范围来确定寻呼范围。可能需要向多个RAN anchor发送寻 呼。
步骤704：假设终端在目标RAN Anchor的覆盖范围被寻呼到。
步骤705：终端发起业务请求或者数据业务恢复请求，请求恢复数据连接。当终端收到寻呼消息，可以比较之前驻留的RAN anchor范围和新的小区所在的RAN anchor信息判断发起业务请求，而不是数据业务。或者，为了简化终端操作可以不进行任何比较，终端总是发起数据业务恢复请求，其中携带网络侧为终端分配的临时标识。
如果终端发起的业务请求，则目标RAN Anchor将其转发给核心网的移动管理单元。在不同的架构中，可能要发给其他的核心网网元，并转发给移动管理功能。
如果终端发起的数据业务恢复请求，则目标RAN anchor根据本地没有可以用于恢复数据的信息判断需要转发给核心网。目标RAN anchor根据终端携带的临时标识找到终端之前所在的核心网网元，并发生数据业务恢复请求。
步骤706：MMF比较之前保存的源RAN anchor的信息，和步骤705中的目标RAN anchor的信息，判断终端移动到了新的RAN anchor区域，并且在源RAN anchor可能存在缓存数据。
步骤707：如果该过程是由寻呼触发，则MMF通知源RAN anchor停止寻呼，并指示终端从新的RAN anchor接入，其中携带目标RAN anchor的信息。如果没有寻呼触发，而是终端从新接入点接入，则MMF通知源RAN anchor节点，终端从新的RAN anchor节点接入，并携带目标RAN anchor节点的信息。
源RAN anchor判断是否需要数据转发，并且判断是否可以建立直接或者间接转发隧道。
步骤708：源RAN anchor返回转发隧道建立请求，其中携带直接转发或者间接转发指示。
该消息中还可以进一步包含终端的RAN上下文，可以通过MMF在步骤709中透传给目标RAN anchor节点。
步骤709：根据步骤708中的指示，如果需要建立间接转发隧道，则MMF通知SMF-C建立间接转发隧道，SMF-C选择合适的SMF-U作为间接转发，并将建立的转发隧道标识和地址分配返回给MMF。如果建立的间接转发隧道，MMF通知SMF-C的过程，可以在步骤511之后执行，即已经获取了目标RAN anchor的转发隧道信息之后在执行，从而减少信令交互。
如果建立直接转发隧道，则不需要选择CN的转发数据功能。
MMF发送UE上下文建立请求给目标RAN anchor，其中携带核心网的隧道段标识和地址，以及终端的会话、安全上下文，并且指示目标RAN anchor需要建立数据转发隧道。
步骤710：目标RAN anchor保存终端的上下文，并根据终端的上下文建立相应的无线连接。
步骤711：目标RAN anchor返回上下文建立响应，并根据指示返回数据转发的相关信息，隧道段标识和IP地址。
步骤712：MMF向源RAN anchor返回转发隧道建立响应。
如果建立了间接转发隧道，则需要将目标RAN anchor返回的数据转发隧道信息发送给的SMF-C，SMF-C将其发送给参与间接转发的SMF-U。MMF在转发隧道建立响应消息中携带参与间接转发的SMF-U的隧道信息。
如果是建立直接转发隧道，则MMF在转发隧道建立响应消息中，携带目标RAN anchor返回的转发隧道信息。
步骤713：源RAN anchor可以在数据转发结束后，显式的通知释放与核心网的连接。也可以采用定时器的方式，当定时器超时后，源RAN anchor，核心网参与数据转发的网元，释放相应的转发资源。
图8是基于图3的架构下，数据恢复时，转发路径建立的流程二。如图8所示，所述流程包括：
步骤801：下行数据到达源RAN，RAN触发寻呼。如果RAN侧实现的控制面和用户面分离，下行数据缓存在用户面，从而触发控制面进行寻呼。RAN anchor在自身的覆盖范围内触发寻呼。
步骤802～803：RAN anchor节点触发寻呼的同时，通知核心网MMF下行数据到达，MMF可以在更大的范围内寻呼终端。MMF根据为终端分配的位置更新的范围来确定寻呼范围。可能需要向多个RAN anchor发送寻呼。
步骤804：假设终端在目标RAN Anchor的覆盖范围被寻呼到。
步骤805：终端发起业务请求或者数据业务恢复请求，请求恢复数据连接。当终端收到寻呼消息，可以比较之前驻留的RAN anchor范围和新的小区所在的RAN anchor信息判断发起业务请求，而不是数据业务。或者，为了简化终端操作可以不进行任何比较，终端总是发起数据业务恢复请求，其中携带网络侧为终端分配的临时标识。
如果终端发起的业务请求，则目标RAN Anchor将其转发给核心网的移动管理单元。在不同的架构中，可能要发给其他的核心网网元，并转发给移动管理功能。
如果终端发起的数据业务恢复请求，则目标RAN anchor根据本地没有可以用于恢复数据的信息判断需要转发给核心网。目标RAN anchor根据终端携带的临时标识找到终端之前所在的核心网网元，并发生数据业务恢复请求。
由于可能存在转发数据，为了减少后续的信令交互，因此可以在该消息中携带转发隧道信息。
步骤806：MMF比较之前保存的源RAN anchor的信息，和步骤805中的目标RAN anchor的信息，判断终端移动到了新的RAN anchor区域，并且在源RAN anchor可能存在缓存数据。
步骤807：如果该过程是由寻呼触发，则MMF通知源RAN anchor停止寻呼，并指示终端从新的RAN anchor接入，其中携带目标RAN anchor的信息。源RAN anchor判断是否需要数据转发，并且判断是否可以建立直接或者间接转发隧道。
如果没有寻呼触发，而是终端从新接入点接入，则MMF通知源RAN anchor节点，终端从新的RAN anchor节点接入，并携带目标RAN anchor 节点的信息。
步骤808：源RAN anchor返回转发隧道建立请求，其中携带直接转发或者间接转发指示。
该消息中还可以进一步包含终端的RAN上下文，可以通过MMF在步骤809中透传给目标RAN anchor节点。
步骤809，MMF发送UE上下文建立请求给目标RAN anchor，其中携带核心网的隧道段标识和地址，以及终端的会话、安全上下文。
步骤810：目标RAN anchor保存终端的上下文，并根据终端的上下文建立相应的无线连接。
步骤811：目标RAN anchor返回上下文建立响应，并根据指示返回数据转发的相关信息，隧道段标识和IP地址。
步骤812：MMF向源RAN anchor返回转发隧道建立响应。根据步骤808中的指示，如果建立间接转发隧道，则MMF通知SMF-C建立间接转发隧道，并将步骤805中收到的目前RAN anchor的转发隧道信息，发送给SMF-C，SMF-C选择合适的SMF-U作为间接转发，并将建立的转发隧道标识和地址分配返回给MMF，MMF将转发隧道标识和地址发送给源RAN anchor。如果建立直接转发隧道，则MMF将步骤805中收到的目标RAN anchor发送转发数据隧道信息发送给源RAN anchor
该步骤可以在步骤808之后立即执行。
步骤813：源RAN anchor可以在数据转发结束后，显式的通知释放与核心网的连接。也可以采用定时器的方式，当定时器超时后，源RAN anchor，核心网参与数据转发的网元，释放相应的转发资源。
图9是基于图3的架构下，数据恢复时，转发路径建立的流程三。如图9所示，所述流程包括：
步骤901：下行数据到达源RAN，RAN触发寻呼。如果RAN侧实现的控制面和用户面分离，下行数据缓存在用户面，从而触发控制面进行寻呼。RAN anchor在自身的覆盖范围内触发寻呼。
步骤902～903：RAN anchor节点触发寻呼的同时，通知核心网MMF下 行数据到达，MMF可以在更大的范围内寻呼终端。MMF根据为终端分配的位置更新的范围来确定寻呼范围。可能需要向多个RAN anchor发送寻呼。
步骤904：假设终端在目标RAN Anchor的覆盖范围被寻呼到。
步骤905：终端发起业务请求或者数据业务恢复请求，请求恢复数据连接。当终端收到寻呼消息，可以比较之前驻留的RAN anchor范围和新的小区所在的RAN anchor信息判断发起业务请求，而不是数据业务。或者，为了简化终端操作可以不进行任何比较，终端总是发起数据业务恢复请求，其中携带网络侧为终端分配的临时标识。
如果终端发起的业务请求，则目标RAN Anchor将其转发给核心网的移动管理单元。在不同的架构中，可能要发给其他的核心网网元，并转发给移动管理功能。
如果终端发起的数据业务恢复请求，则目标RAN anchor根据本地没有可以用于恢复数据的信息判断需要转发给核心网。目标RAN anchor根据终端携带的临时标识找到终端之前所在的核心网网元，并发生数据业务恢复请求。
源RAN anchor发送给MMF的消息中还可以进一步包含终端的RAN上下文，可以通过MMF在步骤907中透传给目标RAN anchor节点。
步骤906：MMF比较之前保存的源RAN anchor的信息，和步骤905中的目标RAN anchor的信息，判断终端移动到了新的RAN anchor区域，并且在源RAN anchor可能存在缓存数据。
步骤907：MMF发送UE上下文建立请求给目标RAN anchor，其中携带核心网的隧道段标识和地址，以及终端的会话、安全上下文，以及源RAN anchor或者源接入基站的相关信息。
步骤908：目标RAN anchor保存终端的上下文，并根据终端的上下文建立相应的无线连接。
步骤909：目标RAN anchor返回上下文建立响应。目标RAN anchor根据步骤907中携带的源侧信息判断直接转发或者间接转发，并在响应消息 中通知MMF。该消息中还携带数据转发的相关信息：隧道段标识和IP地址。
步骤910：MMF向源RAN anchor发送转发隧道建立请求。
根据步骤909中的指示，如果需要建立间接转发隧道，则MMF通知SMF-C建立间接转发隧道，SMF-C选择合适的SMF-U作为间接转发，并将建立的转发隧道标识和地址分配返回给MMF。MMF将目标RAN anchor返回的数据转发隧道信息发送给的SMF-C，SMF-C将其发送给参与间接转发的SMF-U。MMF在转发隧道建立请求消息中携带参与间接转发的SMF-U的隧道信息。
如果建立直接转发隧道，则不需要选择CN的转发数据功能。MMF在转发隧道建立请求消息中，携带目标RAN anchor返回的转发隧道信息。
步骤911：源RAN anchor可以在数据转发结束后，显式的通知释放与核心网的连接。也可以采用定时器的方式，当定时器超时后，源RAN anchor，核心网参与数据转发的网元，释放相应的转发资源。
为了实现一种更加快速的恢复，可以在图9的基础上进行如下优化：
步骤905：终端发起的业务恢复消息中，携带源RAN anchor节点或者源RAN node的信息，例如恢复ID中包含源基站的信息。目标RAN anchor根据这一信息判断执行间接或者直接转发。在发送给MMF的数据恢复请求中携带转发数据的隧道信息，包括隧道端标识和地址信息。还包括间接转发或者直接转发指示。
此时MMF不需要在步骤909之后执行步骤910，而是步骤910～911可以和步骤907～909同时执行，从而加快数据恢复的速度。
图10为本发明实施例的数据转发装置的结构组成示意图一，如图10所示，所述装置包括：
通知单元11，设置为确定终端接入至目标无线接入点时，向所述目标无线接入点以及源无线接入点发送用于通知建立转发隧道的消息。
所述通知单元11，还设置为接收到源无线接入点发送的建立转发隧道的指示后，指示所述目标无线接入点建立转发隧道；向所述源无线接入点 发送转发隧道信息。
所述装置还包括：
寻呼单元12，设置为当针对所述终端的下行数据达到时，通过多个无线接入点向所述终端发起寻呼；将寻呼到所述终端的无线接入点作为所述目标无线接入点。
所述通知单元11，还设置为向所述源无线接入点通知所述目标无线接入点的节点信息；当所述源无线接入点判断出建立直接转发隧道或者间接转发隧道后，接收所述源无线接入点发送的判断结果。
所述通知单元11通过指示消息的方式接收所述判断结果；所述指示消息还携有终端的RAN上下文，所述RAN上下文通过所述核心网网元透传给目标RAN节点。
所述通知单元11，还设置为向所述目标无线接入点通知所述源无线接入点的节点信息；当所述目标无线接入点判断出建立直接转发隧道或者间接转发隧道后，接收所述目标无线接入点发送的判断结果。
所述装置还包括：
分配单元13，设置为根据所述判断结果，确定建立间接转发隧道时，分配核心网转发隧道信息。
图11为本发明实施例的数据转发装置的结构组成示意图二，如图11所示，所述装置包括：
确定单元21，设置为当源无线接入点接收核心网网元发送的寻呼停止消息后，确定是否需为所述终端建立转发隧道；
发送单元22，设置为当需为所述终端建立转发隧道时，向所述核心网网元发送转发隧道建立请求；
转发单元23，设置为在接收到所述核心网网元发送的转发隧道建立完成消息后，利用所建立的转发隧道进行终端资源的转发。
所述确定单元21，还设置为确定是否需为所述终端建立转发隧道时，还确定建立间接转发隧道还是直接转发隧道。
本发明实施例还提供一种计算机可读存储介质，存储有计算机可执行指令，所述计算机可执行指令被处理器执行时实现如图5所述的数据转发方法。
本发明实施例还提供一种计算机可读存储介质，存储有计算机可执行指令，所述计算机可执行指令被处理器执行时实现如图6所述的数据转发方法。
在本发明所提供的几个实施例中，所揭露的方法和智能设备，可以通过其它的方式实现。以上所描述的设备实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，如：多个单元或组件可以结合，或可以集成到另一个系统，或一些特征可以忽略，或不执行。另外，所显示或讨论的各组成部分相互之间的耦合、或直接耦合、或通信连接可以是通过一些接口，设备或单元的间接耦合或通信连接，可以是电性的、机械的或其它形式的。
上述作为分离部件说明的单元可以是、或也可以不是物理上分开的，作为单元显示的部件可以是、或也可以不是物理单元，即可以位于一个地方，也可以分布到多个网络单元上；可以根据实际的需要选择其中的部分或全部单元来实现本实施例方案的目的。
另外，在本发明各实施例中的各功能单元可以全部集成在一个第二处理单元中，也可以是各单元分别单独作为一个单元，也可以两个或两个以上单元集成在一个单元中；上述集成的单元既可以采用硬件的形式实现，也可以采用硬件加软件功能单元的形式实现。
以上所述，仅为本发明的实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。

Claims (18)

  1. 一种数据转发方法，所述方法包括：
    确定终端接入至目标无线接入点时，核心网网元向所述目标无线接入点以及源无线接入点发送用于通知建立转发隧道的消息。
  2. 根据权利要求1所述的数据转发方法，所述方法还包括：
    所述核心网网元接收到源无线接入点发送的建立转发隧道的指示后，指示所述目标无线接入点建立转发隧道；向所述源无线接入点发送转发隧道信息。
  3. 根据权利要求1所述的数据转发方法，所述方法还包括：
    当针对所述终端的下行数据达到时，所述核心网网元通过多个无线接入点向所述终端发起寻呼；
    将寻呼到所述终端的无线接入点作为所述目标无线接入点。
  4. 根据权利要求2所述的数据转发方法，所述方法还包括：
    所述核心网网元向所述源无线接入点通知所述目标无线接入点的节点信息；
    当所述源无线接入点判断出建立直接转发隧道或者间接转发隧道后，所述核心网元接收所述源无线接入点发送的判断结果。
  5. 根据权利要求1所述的数据转发方法，所述方法还包括：
    所述核心网网元向所述目标无线接入点通知所述源无线接入点的节点信息；
    当所述目标无线接入点判断出建立直接转发隧道或者间接转发隧道后，所述核心网元接收所述目标无线接入点发送的判断结果。
  6. 根据权利要求4或5所述的数据转发方法，其中，所述核心网元通过指示消息的方式接收所述判断结果；
    所述指示消息还携有终端的无线接入网RAN上下文，所述RAN上下文通过所述核心网网元透传给目标RAN节点。
  7. 根据权利要求4或5所述的数据转发方法，其中，
    所述核心网网元根据所述判断结果，确定建立间接转发隧道时，分配核心网转发隧道信息。
  8. 一种数据转发方法，所述方法包括：
    源无线接入点接收核心网网元发送的寻呼停止消息后，确定是否需为所述终端建立转发隧道；
    需为所述终端建立转发隧道时，向所述核心网网元发送转发隧道建立请求；
    在接收到所述核心网网元发送的转发隧道建立完成消息后，利用所建立的转发隧道进行终端资源的转发。
  9. 根据权利要求8所述的数据转发方法，所述方法还包括：所述源无线接入点确定是否需为所述终端建立转发隧道时，还确定建立间接转发隧道还是直接转发隧道。
  10. 一种数据转发装置，所述装置包括：
    通知单元，设置为确定终端接入至目标无线接入点时，向所述目标无线接入点以及源无线接入点发送用于通知建立转发隧道的消息。
  11. 根据权利要求10所述的数据转发装置，其中，所述通知单元，还设置为接收到源无线接入点发送的建立转发隧道的指示后，指示所述目标无线接入点建立转发隧道；向所述源无线接入点发送转发隧道信息。
  12. 根据权利要求10所述的数据转发装置，所述装置还包括：
    寻呼单元，设置为当针对所述终端的下行数据达到时，通过多个无线接入点向所述终端发起寻呼；将寻呼到所述终端的无线接入点作为所述目标无线接入点。
  13. 根据权利要求11所述的数据转发装置，其中，所述通知单元，还设置为向所述源无线接入点通知所述目标无线接入点的节点信息；当所述源无线接入点判断出建立直接转发隧道或者间接转发隧道后，接收所述源无线接入点发送的判断结果。
  14. 根据权利要求11所述的数据转发装置，其中，所述通知单元，还设置为向所述目标无线接入点通知所述源无线接入点的节点信息；当所述目 标无线接入点判断出建立直接转发隧道或者间接转发隧道后，接收所述目标无线接入点发送的判断结果。
  15. 根据权利要求13或14所述的数据转发装置，其中，所述通知单元通过指示消息的方式接收所述判断结果；所述指示消息还携有终端的RAN上下文，所述RAN上下文通过所述核心网网元透传给目标RAN节点。
  16. 根据权利要求13或14所述的数据转发装置，所述装置还包括：
    分配单元，设置为根据所述判断结果，确定建立间接转发隧道时，分配核心网转发隧道信息。
  17. 一种数据转发装置，所述装置包括：
    确定单元，设置为当源无线接入点接收核心网网元发送的寻呼停止消息后，确定是否需为所述终端建立转发隧道；
    发送单元，设置为当需为所述终端建立转发隧道时，向所述核心网网元发送转发隧道建立请求；
    转发单元，设置为在接收到所述核心网网元发送的转发隧道建立完成消息后，利用所建立的转发隧道进行终端资源的转发。
  18. 根据权利要求17所述的数据转发装置，其中，所述确定单元，还设置为确定是否需为所述终端建立转发隧道时，还确定建立间接转发隧道还是直接转发隧道。
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