WO2011140927A1 - 一种增强移动性的分流方法及装置 - Google Patents

一种增强移动性的分流方法及装置 Download PDF

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Publication number
WO2011140927A1
WO2011140927A1 PCT/CN2011/073464 CN2011073464W WO2011140927A1 WO 2011140927 A1 WO2011140927 A1 WO 2011140927A1 CN 2011073464 W CN2011073464 W CN 2011073464W WO 2011140927 A1 WO2011140927 A1 WO 2011140927A1
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Prior art keywords
base station
dedicated tunnel
small base
nat
connection relationship
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PCT/CN2011/073464
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English (en)
French (fr)
Inventor
汤德龙
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中兴通讯股份有限公司
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Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to EP11780148.0A priority Critical patent/EP2571309A4/en
Priority to US13/575,955 priority patent/US9258739B2/en
Publication of WO2011140927A1 publication Critical patent/WO2011140927A1/zh

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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
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H04L61/09—Mapping addresses
    • H04L61/25—Mapping addresses of the same type
    • H04L61/2503—Translation of Internet protocol [IP] addresses
    • H04L61/2514—Translation of Internet protocol [IP] addresses between local and global IP addresses
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H04L61/09—Mapping addresses
    • H04L61/25—Mapping addresses of the same type
    • H04L61/2503—Translation of Internet protocol [IP] addresses
    • H04L61/2592—Translation of Internet protocol [IP] addresses using tunnelling or encapsulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/12—Setup of transport tunnels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems
    • H04W84/045—Public Land Mobile systems, e.g. cellular systems using private Base Stations, e.g. femto Base Stations, home Node B

Definitions

  • the present invention relates to the field of mobile communications, and more particularly to an enhanced mobility splitting method in a system in which a PS (Packet Switched) domain data stream is required in an RAN (Radio Access Network) offload (Offload) Device.
  • PS Packet Switched
  • RAN Radio Access Network
  • FIG. 1 a typical Offload networking solution is shown in Figure 1.
  • This networking structure is based on a flattened architecture.
  • the Femto Node B terminates the air interface.
  • NAT is used directly.
  • NAS non-access stratum
  • This solution is mainly used in 2/3G networks, and there are certain restrictions in the use of LTE networks.
  • the small base station has built-in Offload identification mechanism and Gi interface protocol stack, so that low-value service data can be directly identified in the small base station and sent to the relatively low-cost fixed network transmission.
  • Let high-value business data go through the traditional wireless network transmission channel.
  • high-value business data can be refined and managed.
  • the protocol stack model of the Offload data stream is shown in Figure 2.
  • This networking scheme can deploy the Offload strategy simply and quickly, but the problem is that mobility is not high.
  • UE User Equipment
  • IP Internet Protocol
  • the Offload data stream must not be continuously chained and needs to be reconnected. The reason is: UE uses IP (Internet Protocol) address IPue When accessing the Internet (Internet), when the message sent by the UE passes through the small base station 1, it will be replaced by the NAT module with the IP address IPnbl of the small base station 1, so that the IP address actually established with the Internet is IPnbl.
  • IP Internet Protocol
  • the UE moves to another small base station 2, at which time the NAT module on the small base station 2 replaces the IPue with the IP address IPnb2 of the small base station 2, so that the IP address interacting with the Internet changes, for the Internet server, the same
  • the peer IP of the connection cannot be changed. If the peer IP address changes, it is not the same connection. It can be seen that the existing offloading scheme has a problem of poor mobility. Summary of the invention
  • the main object of the present invention is to provide a method and an apparatus for offloading, which are used to solve the technical problem of poor mobility of the existing offload networking solution.
  • a shunting method for enhancing mobility comprising:
  • NAT network address translation
  • the small base station performs the offloading process of the packet switched domain data according to the offload (Offload) policy, and forwards the offloaded data through the dedicated tunnel according to the connection relationship;
  • the NAT gateway performs NAT translation of the offloaded data packet, and according to the The connection relationship forwards the offloaded data through the dedicated tunnel.
  • the dedicated tunnel is a fixed dedicated tunnel established based on the small base station;
  • the connection relationship maintained by the small base station is: a correspondence between an IP address of the UE, a radio bearer link (RAB) of the UE, and a user identifier of the UE.
  • RAB radio bearer link
  • the connection relationship maintained by the NAT gateway is: a mapping between a NAT entry, a UE user identifier, and a dedicated tunnel.
  • the small base station handover occurs in the UE due to mobility
  • the base station notifies the NAT gateway to suspend the transmission of the downlink offload data packet corresponding to the UE user identifier by using the UE user identifier; after the UE accesses the target small base station, the target small base station reports the UE user identifier information to the NAT gateway, and the NAT gateway Modifying a connection relationship for the UE to the target small base station according to the user identifier.
  • the dedicated tunnel is a temporary dedicated tunnel established for the RAB of the UE;
  • the connection relationship maintained by the small base station is: a correspondence between a user identifier of the UE, a dedicated tunnel, and an RAB;
  • the relationship is: the correspondence between the user identifier of the UE, the dedicated tunnel, and the NAT entry.
  • the source small base station when the UE performs handover of the small base station due to mobility, notifies the NAT gateway to suspend the transmission of the downlink offloaded data packet corresponding to the UE user identifier by using the UE user identifier or the tunnel identifier list; After the target small base station is accessed, the target small base station and the NAT gateway establish a new dedicated tunnel, and the NAT gateway modifies the connection relationship of the UE according to the user identifier of the UE. After the handover is completed, the source small base station and the NAT gateway delete the expired dedicated tunnel.
  • the user identifier is an International Mobile Subscriber Identity (IMSI) or a Temporary Mobile Subscriber Identity (TMSI);
  • the tunnel protocol used by the dedicated tunnel is: a general packet radio transmission service tunneling protocol user plane part (GTPU) protocol , or the Generic Routing Encapsulation (GRE) protocol, or the Virtual Private Network (VPN) protocol, or the Virtual Local Area Network (VLAN) protocol.
  • GTP Generic Routing Encapsulation
  • VPN Virtual Private Network
  • VLAN Virtual Local Area Network
  • the present invention also provides a shunt device for enhancing mobility, the device comprising:
  • a dedicated tunnel management module configured to establish and maintain a dedicated tunnel for transmitting the offloaded data between the small base station and the NAT gateway, maintain a connection relationship for the offloaded data transmission for the UE based on the dedicated tunnel, and perform the connection in the handover process Switching function of relationship;
  • the offload data processing module is located at the small base station, and is configured to perform offload processing of the packet switched domain data according to the offload (Offload) policy, and send and receive the split data through the dedicated tunnel according to the connection relationship;
  • the network address translation module is located at the NAT gateway, and is configured to perform NAT translation of the offloaded data packet, and forward the offloaded data through the dedicated tunnel according to the connection relationship.
  • the dedicated tunnel established by the dedicated tunnel management module is a fixed dedicated tunnel;
  • the connection relationship according to the offloaded data processing module is: an IP address of the UE, a radio bearer link (RAB) of the UE, and a user identifier of the UE.
  • RAB radio bearer link
  • Corresponding relationship between the network address translation module the correspondence between the NAT entry, the user identifier of the UE, and the dedicated tunnel.
  • the network address translation module pauses the transmission of the downlink offload data packet corresponding to the UE user identifier when the UE performs the handover of the small base station due to mobility; after the UE accesses the target small base station, the dedicated tunnel management module modifies according to the user identifier.
  • the connection of the UE is related to the target small base station.
  • the dedicated tunnel established by the dedicated tunnel management module is a temporary dedicated tunnel established for the RAB of the UE;
  • connection relationship according to the offloaded data processing module is: a user identifier of the UE, a dedicated tunnel, and a correspondence between the RABs;
  • connection relationship according to the network address translation module is: a NAT entry, a user identifier of the UE, and a dedicated tunnel Correspondence between them.
  • the network address translation module suspends the transmission of the downlink offloaded data packet corresponding to the UE user identifier or the tunnel identifier list when the UE performs the handover of the small base station due to the mobility; after the UE accesses the target small base station, the dedicated tunnel management module is The UE establishes a new dedicated tunnel, and modifies the corresponding connection relationship according to the user identifier of the UE, and deletes the expired dedicated tunnel after the handover is completed.
  • a NAT gateway is deployed on the upper layer of the small base station, and a dedicated tunnel for transmitting the offloaded data is established between the small base station and the NAT gateway, and the NAT gateway performs NAT conversion of the offloaded data packet, and passes the dedicated connection according to the connection relationship.
  • the tunnel forwards the offloaded data.
  • FIG. 1 is a schematic diagram of an Offload networking solution in the prior art
  • Figure 2 shows the protocol stack model of the Offload data stream
  • FIG. 3 is a schematic diagram of an Offload networking scheme proposed by the present invention.
  • FIG. 4 is a flowchart of a method for enhancing mobility of a shunt provided by the present invention
  • FIG. 5 is a structural diagram of a shunt device for enhancing mobility provided by the present invention. detailed description
  • FIG. 4 is a flowchart of a method for offloading mobility enhancement according to the present invention.
  • the method is based on a traffic distribution network structure as shown in FIG. 3.
  • the present invention deploys a NAT gateway between a small base station and the Internet, and a NAT gateway can be connected.
  • a plurality of small base stations, a small base station and a NAT gateway establish a dedicated tunnel for carrying the offloaded data, and when the UE moves, the mobility of the UE is managed by the handover of the dedicated tunnel, and the NAT gateway that performs network address mapping is introduced.
  • the technical defect of the network address change caused by the UE switching the small base station is shielded.
  • the traffic stream disconnection reconnection is not required, thereby improving the mobility of the existing offload network system.
  • the method for enhancing mobility of the present invention includes the following steps:
  • Step 401 Establish a dedicated tunnel for carrying the offload data between the first small base station and the NAT gateway, and send the Offload data stream.
  • the dedicated tunnel may be a fixed dedicated tunnel established by the small base station or a temporary dedicated tunnel established for the RAB of the UE.
  • a dedicated tunnel from the small base station to the NAT gateway is established for each UE or even the RAB of the UE for forwarding the offloaded data stream for each UE;
  • each small base station establishes a dedicated tunnel from the small base station to the NAT gateway, and uses the same small base for the transmission of the offloaded data stream for all the UEs in the small base station.
  • Different UEs under the station are distinguished by different service layer IP addresses.
  • the tunneling protocol used by the dedicated tunnel needs to be able to distinguish different base stations or even different UEs under the base station by using a certain feature of the protocol.
  • the tunneling protocol may be a GTPU (General Packet Radio Service Tunneling Protocol for User Plane).
  • GTPU General Packet Radio Service Tunneling Protocol for User Plane.
  • Step 402 The first small base station performs offload identification on the data stream sent by the UE, and processes the non-offload data stream according to the Iuh interface protocol stack.
  • the Offload data stream is encapsulated by using a dedicated tunnel protocol and sent to the NAT gateway.
  • Step 403 After receiving the tunneling protocol packet, the NAT gateway performs the solution of the tunneling protocol, and performs NAT conversion on the decoded packet, and sends the packet to the Internet, and records the correspondence between the NAT entry and the dedicated tunnel.
  • the NAT entry includes a mapping relationship between an IP/port address of the UE accessing the network side application data stream and a protocol type and an IP/port address and protocol type exposed to the Internet;
  • Step 404 The NAT gateway performs reverse NAT processing on the received Internet data, and searches for the local dedicated tunnel according to the correspondence between the NAT entry and the dedicated tunnel, and sends the reverse NAT processed packet to the corresponding dedicated tunnel. .
  • Step 405 After receiving the data sent from the tunnel, the small base station mixes the data received with the Iuh interface, and sends the data to the UE.
  • Step 406 When the UE moves from the first small base station to the second small base station, the first small base station first notifies the NAT gateway UE to prepare for handover, and the NAT gateway pauses the downlink message transmission corresponding to the IP address of the UE; After the two small base stations, the UE reports a handover message to the NAT gateway, and the NAT gateway performs a handover operation of the dedicated tunnel, modifies the connection relationship of the UE to the second small base station, and continues to transmit and receive the message on the new dedicated channel;
  • Example 1 Example 1:
  • Step 501 The NAT gateway is deployed above the small base station to manage multiple small base stations in a certain area. After the power is turned on, the NAT gateway and the small base station establish a dedicated VPN tunnel for transmitting the split data.
  • Step 502 The small base station is pre-configured with an Offload policy, and the configuration policy may be different according to a specific operation scenario, and one or more combinations of the Offload policies are:
  • the core network explicitly identifies, by the RANAP (Radio Access Network Application Part) message, that the corresponding data stream cannot be Offloaded for the UE, The base station does not perform Offload processing on the UE;
  • RANAP Radio Access Network Application Part
  • ARP Address/Retention Priority
  • the preset threshold 1 for example, greater than 10
  • ARP Address/Retention Priority
  • the threshold 2 for example If less than 10 is greater than 5, the partial offload processing is performed on all data streams corresponding to the RAB; if less than the threshold 2, the Offload processing is not performed;
  • Step 503 The UE accesses the small base station 1 (NB1), and the NB1 listens to the NAS and the Access Stratum (AS) message of the UE, and determines whether the PS data of the UE can be offloaded and divided. The characteristics of the flow, and record the unique identifier of the UE.
  • the unique identifier may be an IMSI (International Mobile Subscriber Identity) or a TMSI (Temporary Mobile Subscriber Identity).
  • Step 504 The NB1 and the NAT gateway establish a connection relationship of the UE by using the IMSI/TMSI, where the connection relationship includes: the NB1 maintains the service IP address of the UE (UE IP), the radio bearer link of the UE (UE RAB), and the identifier of the UE ( Correspondence between UE IMSI/TMSI); NAT gateway maintains the UE's service IP address (UE IP) and protocol type and port number, the IP address and protocol type and port number exposed by the NAT gateway corresponding to the UE data stream to the Internat, Correspondence between the identity of the UE (IMSI/TMSI) and the private tunnel (NB1 VPN).
  • the connection relationship includes: the NB1 maintains the service IP address of the UE (UE IP), the radio bearer link of the UE (UE RAB), and the identifier of the UE ( Correspondence between UE IMSI/TMSI); NAT gateway maintains the UE's service IP address (UE IP
  • Step 505 The UE performs data interaction between the NB1 and the Internet.
  • the NB1 parses the data stream of the UE, and determines whether the data stream needs Offload according to the Offload policy.
  • Step 506 NB1 records the correspondence between the source IP address of the Offload data and the UE RAB, and sends the Offload data to the VPN channel between the NAT gateway and the NAT gateway.
  • Step 507 The NAT gateway receives the data of the VPN tunnel, performs NAT processing on the IP packet, records the correspondence between the NAT entry and the dedicated VPN tunnel, and sends the NAT processed data to the Internet.
  • Step 508 When the Internet has data to be sent to the UE, the NAT gateway performs reverse NAT processing according to the correspondence between the recorded NAT entry and the dedicated VPN tunnel, and sends the reverse NAT to the VPN channel corresponding to the NB1.
  • Step 509 The downlink packet arrives at the NB1, and the NB1 parses the destination IP address of the packet, finds the corresponding RAB of the UE, and sends the packet to the corresponding RAB of the corresponding user.
  • Step 510 The UE switches to the small base station 2 (NB2), and the NB1 first notifies the NAT gateway that the UE needs to switch to the NB2, and the NAT gateway suspends the sending of the downlink packet corresponding to the IP address of the UE IMSI/TMSI;
  • Step 511 After the UE accesses the NB2 (the access related process is the same as the processing on the NB1), the NB2 After the UE gateway receives the user identifier, the NAT gateway first retrieves whether there is a connection relationship for the UE. If yes, the NAT gateway modifies the connection relationship of the UE to On NB2, continue to send and receive packets on the new channel; if not, establish a new connection relationship.
  • Embodiment 2 (Refer to the above example, this example mainly describes the difference from the above example):
  • the method for establishing a dedicated tunnel for the UE performs the offloading of the PS data stream.
  • the dedicated tunnel established in the first embodiment is a fixed dedicated tunnel established for the small base station, and the fixed dedicated tunnel is a small base station.
  • the establishment is always in existence and will not be removed due to the handover between the UEs in the small base stations.
  • the dedicated tunnel established in this embodiment is a temporary dedicated tunnel established for the RAB of the UE. A dedicated tunnel in the source base station is removed, and a dedicated tunnel in the target base station is established.
  • Step 601 The NAT gateway is deployed on the small base station to manage multiple small base stations in a certain area.
  • the NAT gateway and the small base station maintain interconnection, but no tunnel is established in advance.
  • Step 602 The small base station is pre-configured with an Offload policy, and the configuration policy may be different according to a specific operation scenario.
  • Step 603 The UE accesses the NB1, and the NB1 determines that a certain RAB of the UE1 may require Offload, and then establishes a GTPU dedicated tunnel with the NAT gateway.
  • a user may have multiple dedicated tunnels corresponding to multiple RABs, and the user distinguishes by using the user identifier. ;
  • the mapping between the GTPU dedicated tunnel and the RAB is maintained on the NB1, and the correspondence between the user identifier and the GTPU dedicated tunnel is maintained on the NAT gateway;
  • the user identifier may be, but not limited to, IMSI or TMSI;
  • Step 604 After receiving the uplink data stream sent by the UE, the NB1 identifies whether the Offload, the non-Offload data stream is Iuh encapsulated, and the Offload data stream is GTPU encapsulated.
  • Step 605 The NAT gateway receives the uplink GTPU data, decapsulates the GTPU, performs NAT processing, and records the correspondence between the NAT entry of the packet and the GTPU dedicated tunnel.
  • Step 606 When the Internet has data to be sent to the UE, the NAT gateway performs reverse NAT processing on the packet according to the corresponding relationship between the recorded NAT entry and the GTPU dedicated channel, and performs corresponding GTPU encapsulation;
  • Step 607 After receiving the GTPU packet decapsulation, the NB1 sends the packet and the non-offload packet to the air interface of the corresponding UE according to the correspondence between the GTPU dedicated tunnel and the RAB.
  • Step 608 The UE moves to the NB2, and the NB1 notifies the NAT gateway that the UE is being handed over by the user identifier or the tunnel identifier list, and the NAT gateway pauses to send the downlink data on the GTPU tunnel corresponding to the user identifier or the corresponding tunnel identifier list.
  • Step 609 The UE accesses the NB2, and the NB2 and the NAT gateway establish a new GTPU dedicated tunnel for the RAB of the UE.
  • the NAT gateway modifies the connection relationship of the UE according to the user identifier of the UE, and continues data transmission and reception on the new dedicated tunnel.
  • Step 610 The UE completes the handover, and the NB1 and the NAT gateway delete the failed GTPU tunnel.
  • FIG. 5 is a flow-sharing device for enhancing mobility according to the present invention, the device includes: a shunt data processing module, a network address translation module, and a dedicated tunnel management module;
  • the split data processing module is deployed in the small base station, and the network address translation module is deployed in the NAT gateway (NAT GW) at the upper end of the small base station, and the dedicated tunnel management module exists in both the small base station and the NAT gateway for processing small Tunnel deletion, establishment, and handover between the base station and the NAT gateway.
  • NAT GW NAT gateway
  • a dedicated tunnel management module configured to maintain (establish/delete/modify) a dedicated tunnel between the small base station and the NAT gateway corresponding to the UE, and maintain a connection relationship for offloading data transmission for the UE based on the dedicated tunnel; Responsible for the switching of the dedicated tunnel when moving.
  • the offloaded data processing module is configured to monitor an access stratum (Access Stratum, AS message and a non-access stratum (NAS) message of the user on the small base station, and parse the data flow of the user, and perform a packet switching domain according to the Offload policy. Data shunting processing, and based on the connection relationship Transmitting and distributing the data through the dedicated tunnel;
  • an access stratum Access Stratum, AS message and a non-access stratum (NAS) message of the user on the small base station
  • the network address translation module is configured to perform NAT translation of the offloaded data packet, and forward the offloaded data through the dedicated tunnel according to the connection relationship.
  • the IP packet sent by the UE to the network address translation module by the small base station is encapsulated in a dedicated tunnel.
  • the network address translation module records the address and port correspondence of the private tunnel and the IP packet, and is managed by the NAT gateway.
  • the IP address port of the Gi interface replaces the source address port of the IP address, and the packet is sent to the Gi interface.
  • the network address translation module performs reverse NAT processing on the packet received by the Gi interface, and The processed packet is sent to the corresponding private tunnel.
  • the connection relationship according to the offloaded data processing module is: a correspondence between an IP address of the UE, a radio bearer link (RAB) of the UE, and a user identifier of the UE;
  • the connection relationship according to the conversion module is: a mapping between a NAT entry, a UE user identifier, and a dedicated tunnel.
  • the network address translation module suspends the transmission of the downlink offload data packet corresponding to the UE user identifier when the UE is switched across the small base station because the mobility occurs; after the UE accesses the target small base station, the dedicated tunnel management module modifies according to the user identifier.
  • the connection relationship to the UE is on the target small base station.
  • the connection relationship according to the offloaded data processing module is: a user identifier of the UE, a dedicated tunnel, and a correspondence between the RABs; the connection according to the network address translation module The relationship is: a mapping between a NAT entry, a UE user identifier, and a dedicated tunnel.
  • the network address translation module suspends the transmission of the downlink offload data packet corresponding to the UE user identifier when the UE is switched across the small base station due to the mobility; after the UE accesses the target small base station, the dedicated tunnel management module is the UE. A new dedicated tunnel is established, and the corresponding connection relationship is modified according to the user identifier of the UE, and after the handover is completed, the expired dedicated tunnel is deleted.
  • the present invention deploys a NAT gateway on the upper layer of the small base station, and establishes a dedicated tunnel for transmitting the offloaded data between the small base station and the NAT gateway.
  • the NAT gateway performs NAT translation of the offloaded data packet, and forwards the packet through the dedicated tunnel according to the connection relationship.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

本发明公开了一种增强移动性的分流方法及装置，用于解决现有分流组网方案移动性较差的技术问题。本发明在小基站的上层部署NAT网关，在小基站与所述NAT网关之间建立用于传送分流数据的专用隧道，由NAT网关执行分流数据报文的NAT转换，并依据接续关系通过专用隧道转发分流数据，在UE因为移动性发生跨小基站切换时，只需要修改针对UE的接续关系，不需要Offload数据流断链重连，从而提升了系统的移动性。

Description

一种增强移动性的分流方法及装置 技术领域
本发明涉及移动通信领域， 尤其涉及存在 PS ( Packet Switched, 分组 交换）域数据流在 RAN ( Radio Access Network, 接入网）分流（ Offload ) 需求的系统内的一种增强移动性的分流方法及装置。 背景技术
为了緩解激增的高速数据业务对高成本的无线网络的压力， 移动运营 商迫切需要行之有效的手段将低价值的数据业务尽早从无线网络里面分 流。
室内接入场景里面， 典型的 Offload组网方案如图 1所示， 这种组网结 构基于扁平化架构， 小基站（ Femto Node B )终结了空中接口， 对 Offload 数据流而言， 直接使用 NAT ( network address translation, 网络地址转换） 技术对非接入层 （Non-Access Stratum, NAS )数据做处理， 然后送往 Gi 接口。 这种方案主要应用在 2/3G网络里面， 在 LTE网络里面使用有一定的 限制。
在这种组网结构里面， 小基站内置了 Offload识别机制， 以及 Gi接口 协议栈， 这样， 低价值业务数据能直接在小基站里面被识别， 并送入成本 相对低廉的固网传输里面， 而让高价值的业务数据走传统的无线网络传输 通道， 在无线网络里面， 高价值的业务数据能得到精细化的管理和服务。
Offload数据流的协议栈模型如图 2所示， 这种组网方案能简单快速地 部署 Offload策略，但存在的问题是移动性不高。一旦 UE ( User Equipment, 用户设备）从初始接入的小基站移出， 则 Offload数据流不得不断链， 需要 重新连接。其原因在于： UE以 IP ( Internet Protocol,互联网协议 )地址 IPue 接入互联网 ( Internet ), 当 UE发出的报文经过小基站 1 , 会被 NAT模块替 换成小基站 1的 IP地址 IPnbl , 这样， 实际上与 Internet建链的 IP地址是 IPnbl。 UE移动到另外一个小基站 2, 此时小基站 2上的 NAT模块会以小 基站 2的 IP地址 IPnb2替换 IPue, 这样， 和 Internet交互的 IP地址发生了 变化， 对 Internet服务器而言， 同一个连接的对端 IP是不能变化的， 对端 IP地址变化了就不是同一个连接了， 可见现有分流方案存在移动性较差的 问题。 发明内容
有鉴于此， 本发明的主要目的在于提供一种分流的方法及装置， 用于 解决现有分流组网方案移动性较差的技术问题。
为达到上述目的， 本发明的技术方案是这样实现的：
一种增强移动性的分流方法， 该方法包括：
在小基站上方部署网络地址转换（NAT ) 网关， 在所述小基站与所述 NAT网关之间建立用于传送分流数据的专用隧道， 所述小基站和所述 NAT 网关分别维护基于所述专用隧道进行针对用户设备 ( UE ) 的分流数据传送 的接续关系；
所述小基站依据分流（Offload )策略执行分组交换域数据的分流处理， 依据所述接续关系通过所述专用隧道转发分流数据； 所述 NAT网关执行分 流数据报文的 NAT转换， 并依据所述接续关系通过所述专用隧道转发分流 数据。
进一步地， 所述专用隧道为基于小基站建立的固定专用隧道； 所述小 基站维护的接续关系为： UE的 IP地址、 UE的无线承载链路（RAB )及 UE的用户标识之间的对应关系； 所述 NAT 网关维护的接续关系为： NAT 表项、 UE的用户标识以及专用隧道之间的对应关系。
进一步地，在固定专用隧道情况下，在 UE因为移动性发生小基站切换 时， 源 d、基站以 UE用户标识通知 NAT网关暂停对应 UE用户标识的下行 分流数据报文的发送； UE接入目标小基站后， 由目标小基站向 NAT网关 上报 UE用户标识信息， NAT网关依据所述用户标识修改针对所述 UE的接 续关系到目标小基站上。
进一步地， 所述专用隧道为针对 UE的 RAB建立的临时专用隧道； 所述小基站维护的接续关系为： UE 的用户标识、 专用隧道以及 RAB 之间的对应关系； 所述 NAT网关维护的接续关系为： UE的用户标识、 专 用隧道、 NAT表项之间的对应关系。
进一步地，在临时专用隧道情况下： 在 UE因为移动性发生小基站切换 时， 源小基站以 UE用户标识或隧道标识列表通知 NAT网关暂停对应 UE 用户标识的下行分流数据报文的发送； UE接入目标小基站后， 目标小基站 和 NAT网关建立新的专用隧道， NAT网关依据 UE的用户标识修改 UE的 接续关系； 在切换完成后， 源小基站和 NAT网关删除已失效的专用隧道。
进一步地， 所述用户标识为国际移动用户标识 （IMSI )或临时移动用 户标识（ TMSI ); 所述专用隧道所釆用的隧道协议为： 通用分组无线传输业 务隧道协议用户面部分（GTPU )协议、 或通用路由封装（GRE )协议、 或 虚拟私有网络 ( VPN )协议、 或虚拟局域网 （VLAN )协议。
基于上述方法， 本发明还提出一种增强移动性的分流装置， 该装置包 括：
专用隧道管理模块， 用于在小基站和 NAT网关之间建立和维护用于传 送分流数据的专用隧道，维护基于所述专用隧道进行针对 UE的分流数据传 送的接续关系以及行使切换过程中的接续关系的切换功能；
分流数据处理模块， 位于小基站， 用于依据分流（Offload ) 策略执行 分组交换域数据的分流处理， 并依据所述接续关系通过所述专用隧道收发 分流数据； 网络地址转换模块， 位于 NAT 网关， 用于执行分流数据报文的 NAT 转换， 并依据所述接续关系通过所述专用隧道转发分流数据。
进一步地， 所述专用隧道管理模块建立的专用隧道为固定专用隧道； 所述分流数据处理模块依据的接续关系为： UE的 IP地址、 UE的无线 承载链路（ RAB )及 UE的用户标识之间的对应关系； 所述网络地址转换模 块依据的接续关系为： NAT表项、 UE的用户标识以及专用隧道之间的对应 关系。
在 UE因为移动性发生小基站切换时，所述网络地址转换模块暂停对应 UE用户标识的下行分流数据报文的发送； UE接入目标小基站后， 所述专 用隧道管理模块依据用户标识修改针对所述 UE 的接续关系到目标小基站 上。
进一步地， 所述专用隧道管理模块建立的专用隧道为针对 UE的 RAB 建立的临时专用隧道；
所述分流数据处理模块依据的接续关系为： UE的用户标识、 专用隧道 以及 RAB之间的对应关系；所述网络地址转换模块依据的接续关系为： NAT 表项、 UE的用户标识、 专用隧道之间的对应关系。
在 UE因为移动性发生小基站切换时，所述网络地址转换模块暂停对应 UE用户标识或隧道标识列表的下行分流数据报文的发送； UE接入目标小 基站后， 所述专用隧道管理模块为所述 UE建立新的专用隧道， 依据 UE的 用户标识修改对应的接续关系， 并在切换完成后， 删除已失效的专用隧道。
本发明中，在小基站的上层部署 NAT网关，在小基站与所述 NAT网关 之间建立用于传送分流数据的专用隧道， NAT 网关执行分流数据报文的 NAT转换， 并依据接续关系通过专用隧道转发分流数据， 在 UE因为移动 性发生小基站切换时， 只需要修改针对 UE的接续关系， 不需要 Offload数 据流断链重连， 从而提升了系统的移动性。 附图说明
图 1为现有技术中的 Offload组网方案；
图 2为 Offload数据流的协议栈模型；
图 3为本发明提出的 Offload组网方案；
图 4为本发明提供的一种增强移动性的分流方法的流程图；
图 5为本发明提供的一种增强移动性的分流装置的结构图。 具体实施方式
为使本发明的目的、 技术方案和优点更加清楚明白， 以下举实施例并 参照附图， 对本发明进一步详细说明。
图 4为本发明提供的一种增强移动性的分流方法的流程图， 该方法基 于如图 3所示的分流网络结构， 本发明在小基站与互联网之间部署 NAT网 关，一个 NAT网关可连接多个小基站， 小基站与 NAT网关之间建立用于承 载分流数据的专用隧道， 在 UE移动时， 通过专用隧道的切换实现对 UE移 动性的管理， 由于引入了执行网络地址映射的 NAT网关， 相对于互联网来 说， 屏蔽了由于 UE切换小基站导致网络地址变化的技术缺陷， 在 UE移动 时， 不需要分流数据流断链重连， 从而提升了现有分流网络系统的移动性。
本发明提供的增强移动性的分流方法的包括如下步骤：
步骤 401 : 第一小基站和 NAT网关之间建立用于承载分流数据的专用 隧道， 用于传送 Offload数据流；
优选地， 所述专用隧道可以是小基站建立的固定专用隧道或针对 UE 的 RAB建立的临时专用隧道。
临时专用隧道方式中， 为每个 UE甚或是 UE的 RAB建立一条从小基 站到 NAT网关的专用隧道用于针对每个 UE进行分流数据流的转发；
固定专用隧道方式中， 每个小基站建立一条从小基站到 NAT网关的专 用隧道，用于针对该小基站下所有的 UE进行分流数据流的传送， 同一小基 站下面的不同 UE用不同的业务层 IP地址区分。
所述专用隧道所釆用的隧道协议需要能通过该协议的某个特征区别不 同的基站甚至基站下面不同的 UE, 所述隧道协议可以是 GTPU ( General Packet Radio Service Tunnelling Protocol for User Plane ,通用分组无线传输业 务隧道协议用户面部分）协议、 GRE ( Generic Routing Encapsulation, 通用 路由封装）协议、 VPN ( Virtual Private Network, 虚拟私有网络）协议、 或 VLAN ( Virtual Local Area Network, 虚拟局域网）协议等。
步骤 402: 第一小基站对 UE发送的数据流做分流识别， 对非 Offload 数据流按照 Iuh接口协议栈进行处理； 对 Offload数据流， 使用专用隧道协 议进行封装， 发往 NAT网关。
步骤 403: NAT网关收到专用隧道协议报文后， 进行解隧道协议处理， 并将解出来的报文进行 NAT转换，发往互联网， 同时记录 NAT表项和专用 隧道的对应关系；
所述 NAT表项包含接入网侧应用数据流的 UE的 IP/端口地址和协议类 型与向互联网暴露的 IP/端口地址和协议类型的对应关系；
步骤 404: NAT网关对收到的互联网数据， 进行反向 NAT处理， 并依 据 NAT表项和专用隧道的对应关系查找归属的专用隧道，将反向 NAT处理 后的报文送入对应的专用隧道。
步骤 405: 小基站收到从隧道发来的数据后， 将其与 Iuh接口上收到的 数据进行混合， 并统一发往 UE。
步骤 406: 当 UE从第一小基站移动到第二小基站时， 第一小基站首先 通知 NAT网关 UE准备切换， 则 NAT网关暂停对应 UE的 IP地址的下行 报文发送； 在 UE接入第二小基站后， UE上报切换消息给 NAT网关， NAT 网关执行专用隧道的切换操作，修改 UE的接续关系到第二小基站上，并在 新的专用通道上继续报文的收发； 实施例 1 :
步骤 501 : NAT 网关部署在小基站的上方， 管理某一区域的多个小基 站， NAT网关和小基站之间在上电后建立用于传送分流数据的专用 VPN隧 道。
步骤 502: 小基站预配置了 Offload策略， 配置策略依据具体的运营场 景可以不同， 所述 Offload策略一种或多种的组合：
( a )、 针对某个 UE, 如果在其发起上网请求时， 核心网通过 RANAP ( Radio Access Network Application Part , 无线接入网应用部分） 消息明确 标识针对该 UE不可以 Offload相应数据流， 则小基站不对该 UE做 Offload 处理；
( b )在针对 UE可以做 Offload的前提下， 进一步地， 若 PDP ( Packet Data Protocol, 才艮文数据协议）上下文中， 其 APN ( Access Point Name, 接 入点参考名称 )信息为特定值时， 则该 UE对应 PDP的所有数据流不能做 Offload处理， 否则可以做 Offload处理；
( c )在针对 UE可以做 Offload的前提下 ,进一步地，如果其 RAB( Radio
Access Bearer, 无线接人？载) ό ARP ( Allocation/Retention priority, 分西己 保留优先级）大于预设门限 1时， 例如大于 10, 则对应 RAB上所有数据流 进行 Offload处理； 如果 ARP小于门限 1大于门限 2时， 例如小于 10大于 5时， 则对应 RAB上所有数据流进行部分 Offload处理； 如果小于门限 2 时， 则不做 Offload处理；
( d )在针对 UE可以做 Offload的前提下， 进一步地， 解析该 UE的 RAB的 IP数据包，如果属于 HTTP ( Hypertext Transfer Protocol )数据的话， 则不能 Offload,如果是 P2P( peer to peer:点对点）业务的话，则必须 Offload; 步骤 503: UE接入小基站 1 ( NB1 ), NB1监听 UE的 NAS以及接入 层（Access Stratum, AS ) 消息， 确定 UE的 PS数据是否可以分流以及分 流的特性， 并记录 UE 的唯一标识， 唯一标识可以是 IMSI ( International Mobile Subscriber Identity,国际移动用户标识）或者 TMSI( Temporary Mobile Subscriber Identity , 临时移动用户标识）。
步骤 504: NB1和 NAT网关以 IMSI/TMSI建立 UE的接续关系 , 所述 接续关系包括： NB1维护 UE的业务 IP地址（ UE IP )、 UE的无线承载链 路（ UE RAB )及 UE的标识 （ UE IMSI/TMSI )之间的对应关系； NAT网 关维护 UE的业务 IP地址（ UE IP )和协议类型以及端口号、 对应 UE数据 流的 NAT网关对 Internat暴露的 IP地址和协议类型以及端口号、 UE的标 识（ IMSI/TMSI ) 以及专用隧道（ NB1 VPN )之间的对应关系。
步骤 505 : UE通过 NB1和 Internet进行数据交互， 上行方向上， NB1 解析 UE的数据流， 按照 Offload策略判决数据流是否需要 Offload;
步骤 506: NB1记录 Offload数据的源 IP地址和 UE RAB的对应关系 , 并将 Offload数据送入与 NAT网关之间的 VPN通道；
步骤 507: NAT网关接收 VPN通道的数据， 将 IP报文做 NAT处理， 记录 NAT表项和专用 VPN隧道的对应关系， 并将 NAT处理后数据送入 Internet;
步骤 508: 当 Internet有数据发送给所述 UE时， NAT网关依据记录的 NAT表项和专用 VPN隧道的对应关系做反向 NAT处理， 并将其送入对应 NB1的 VPN通道；
步骤 509: 下行报文到达 NB1 , NB1解析报文的目的 IP地址， 找到归 属 UE的对应 RAB , 并将报文送入对应用户的对应 RAB;
步骤 510: UE切换到小基站 2 ( NB2 ), NB1首先通知 NAT网关 UE 需要切换到 NB2 ,则 NAT网关暂停对应 UE IMSI/TMSI的 IP地址的下行报 文的发送；
步骤 511 : UE接入 NB2后（接入相关过程同 NB1上的处理 ), NB2向 NAT网关上 ^艮 UE用户标识（IMSI/TMSI )信息， NAT网关接收到所述用 户标识后， 首先检索是否存在针对该 UE的接续关系， 如果存在， 则 NAT 网关修改所述 UE的接续关系到 NB2上，并在新的通道上继续报文的收发； 如果不存在， 则建立新的接续关系。
实施例 2 (参照上例， 本例主要描写和上例不同之处）：
本实施例釆用针对 UE建立专用隧道的方法执行 PS数据流的分流， 与 实施例 1不同的是， 实施例 1 中建立专用隧道是针对小基站建立的固定专 用隧道， 固定专用隧道一经小基站建立就一直存在， 不会因为 UE在小基站 之间的切换而拆除， 而本实施例中建立的专用隧道是针对 UE的 RAB建立 的临时专用隧道，在 UE因移动而发生基站切换时， 需要拆除源基站中专用 隧道， 建立在目标基站中的专用隧道。
步骤 601 : NAT 网关部署在小基站的上方， 管理某一区域的多个小基 站， NAT网关和小基站之间保持互联互通， 但不预先建立隧道。
步骤 602: 小基站预配置了 Offload策略， 配置策略依据具体的运营场 景可以不同。
步骤 603: UE接入 NB1 , NB1判决 UE1的某个 RAB可能需要 Offload, 则和 NAT网关建立 GTPU专用隧道， 一个用户下面可以有多个专用隧道对 应多个 RAB , 用户之间通过用户标识进行区分；
NB1上维护 GTPU专用隧道以及 RAB之间的对应关系 , NAT网关上 维护用户标识和 GTPU专用隧道之间的对应关系； 所述用户标识可以是但 不限于 IMSI或 TMSI;
步骤 604: NB1收到所述 UE发送的上行数据流后， 识别是否 Offload, 非 Offload数据流进行 Iuh封装， Offload数据流进行 GTPU封装；
步骤 605: NAT网关收到上行 GTPU数据， 解 GTPU封装， 进行 NAT 处理， 并记录报文的 NAT表项与 GTPU专用隧道的对应关系； 步骤 606: 当 Internet有数据发送给所述 UE时， NAT网关依据记录的 NAT表项和 GTPU专用通道的对应关系对报文做反向 NAT处理，并做对应 的 GTPU封装；
步骤 607: NB1收到 GTPU报文解封装后， 依据 GTPU专用隧道以及 RAB之间的对应关系，将报文和非 Offload报文一起送入对应 UE的空中接 口；
步骤 608: UE移动到 NB2, NB1以用户标识或隧道标识列表通知 NAT 网关 UE正在切换， NAT网关暂停发送对应用户标识下或对应隧道标识列 表的 GTPU隧道上的下行数据；
步骤 609: UE接入 NB2, NB2和 NAT网关建立针对 UE的 RAB的新 的 GTPU专用隧道， NAT网关依据 UE的用户标识修改 UE的接续关系， 在新专用隧道上继续数据收发；
步骤 610: UE完成切换， NB1和 NAT网关删除失效的 GTPU隧道。 图 5 为本发明提供的一种增强移动性的分流装置， 该装置包括： 分流 数据处理模块、 网络地址转换模块、 专用隧道管理模块；
分流数据处理模块部署在小基站里面， 网络地址转换模块部署在小基 站上端的 NAT网关 （NAT Gateway, NAT GW )里面， 而专用隧道管理模 块在小基站和 NAT网关中同时存在，用来处理小基站和 NAT网关之间的隧 道删除、 建立和切换。
专用隧道管理模块， 用于维护 （建立 /删除 /修改）对应于 UE的小基站 和 NAT网关之间的专用隧道， 维护基于所述专用隧道进行针对 UE的分流 数据传送的接续关系； 在 UE发生移动时负责所述专用隧道的切换。
分流数据处理模块， 用于监听小基站上用户的接入层（ Access Stratum, AS消息和非接入层 （ No Access Stratum, NAS ) 消息， 以及解析用户的数 据流， 依据 Offload策略执行分组交换域数据的分流处理， 并依据接续关系 通过所述专用隧道收发分流数据；
网络地址转换模块， 用于执行分流数据报文的 NAT转换， 并依据所述 接续关系通过所述专用隧道转发分流数据。
上行方向上， UE通过小基站转入网络地址转换模块的 IP报文， 被封 装在某种专用隧道内， 网络地址转换模块记录专用隧道和 IP报文的地址、 端口对应关系，并用 NAT网关管理的 Gi接口的 IP地址端口替换 IP ^艮文的 源地址端口， 并将报文送入 Gi接口， 下行方向上， 网络地址转换模块将 Gi口接收到的报文做反向 NAT处理，并将处理后的报文送入对应的专用隧 道。
在釆用固定专用隧道方案时， 所述分流数据处理模块依据的接续关系 为： UE的 IP地址、 UE的无线承载链路 ( RAB )及 UE的用户标识之间的 对应关系； 所述网络地址转换模块依据的接续关系为： NAT表项、 UE的用 户标识以及专用隧道之间的对应关系。在 UE因为移动性发生跨小基站切换 时，所述网络地址转换模块暂停对应 UE用户标识的下行分流数据报文的发 送； UE接入目标小基站后， 所述专用隧道管理模块依据用户标识修改针对 所述 UE的接续关系到目标小基站上。
在釆用针对 UE的 RAB的临时专用隧道方案时， 所述分流数据处理模 块依据的接续关系为： UE的用户标识、 专用隧道以及 RAB之间的对应关 系；所述网络地址转换模块依据的接续关系为： NAT表项、 UE的用户标识、 专用隧道之间的对应关系。在 UE因为移动性发生跨小基站切换时， 所述网 络地址转换模块暂停对应 UE用户标识的下行分流数据报文的发送； UE接 入目标小基站后，所述专用隧道管理模块为所述 UE建立新的专用隧道，依 据 UE的用户标识修改对应的接续关系，并在切换完成后，删除已失效的专 用隧道。
以上所述， 仅为本发明的较佳实施例而已， 并非用于限定本发明的保 护范围。 工业实用性
本发明在小基站的上层部署 NAT网关，在小基站与所述 NAT网关之间 建立用于传送分流数据的专用隧道， NAT网关执行分流数据报文的 NAT转 换，并依据接续关系通过专用隧道转发分流数据，在 UE因为移动性发生小 基站切换时， 只需要修改针对 UE的接续关系， 不需要 Offload数据流断链 重连， 解决了现有分流组网方案中移动性较差的技术问题， 提升了系统的 移动性。

Claims

权利要求书
1、 一种增强移动性的分流方法， 其特征在于， 该方法包括：
在小基站上方部署网络地址转换 NAT网关，在所述小基站与所述 NAT 网关之间建立用于传送分流数据的专用隧道， 所述小基站和所述 NAT网关 分别维护基于所述专用隧道进行针对用户设备 UE 的分流数据传送的接续 关系；
所述小基站依据分流 Offload策略执行分组交换域数据的分流处理，依 据所述接续关系通过所述专用隧道转发分流数据； 所述 NAT网关执行分流 数据报文的 NAT转换， 并依据所述接续关系通过所述专用隧道转发分流数 据。
2、 根据权利要求 1所述的方法， 其特征在于，
所述专用隧道为基于小基站建立的固定专用隧道；
所述小基站维护的接续关系为： UE的 IP地址、 UE 的无线承载链路 RAB及 UE的用户标识之间的对应关系；
所述 NAT网关维护的接续关系为： NAT表项、 UE的用户标识以及专 用隧道之间的对应关系。
3、 根据权利要求 2所述的方法， 其特征在于， 所述方法还包括： 在 UE 因为移动性发生小基站切换时， 源小基站以 UE用户标识通知 NAT网关暂停对应 UE用户标识的下行分流数据 4艮文的发送；
UE接入目标小基站后，由目标小基站向 NAT网关上报 UE用户标识信 息， NAT网关依据所述用户标识修改针对所述 UE的接续关系到目标小基 站上。
4、 根据权利要求 1所述的方法， 其特征在于，
所述专用隧道为针对 UE的 RAB建立的临时专用隧道； 所述小基站维护的接续关系为： UE 的用户标识、 专用隧道以及 RAB 之间的对应关系；
所述 NAT网关维护的接续关系为： UE的用户标识、 专用隧道、 NAT 表项之间的对应关系。
5、 根据权利要求 4所述的方法， 其特征在于， 所述方法还包括： 在 UE因为移动性发生小基站切换时，源小基站以 UE用户标识或隧道 标识列表通知 NAT网关暂停对应 UE用户标识的下行分流数据报文的发送；
UE接入目标小基站后， 目标小基站和 NAT网关建立新的专用隧道， NAT网关依据 UE的用户标识修改 UE的接续关系；
在切换完成后， 源小基站和 NAT网关删除已失效的专用隧道。
6、 根据权利要求 1至 5所述的任一方法， 其特征在于， 所述用户标识 为国际移动用户标识 IMSI或临时移动用户标识 TMSI;
所述专用隧道所釆用的隧道协议为： 通用分组无线传输业务隧道协议 用户面部分 GTPU协议、或通用路由封装 GRE协议、或虚拟私有网络 VPN 协议、 或虚拟局域网 VLAN协议。
7、 一种增强移动性的分流装置， 其特征在于， 该装置包括：
专用隧道管理模块， 用于在小基站和 NAT网关之间建立和维护用于传 送分流数据的专用隧道，维护基于所述专用隧道进行针对 UE的分流数据传 送的接续关系以及行使切换过程中的接续关系的切换功能；
分流数据处理模块， 位于小基站， 用于依据分流策略执行分组交换域 数据的分流处理， 并依据所述接续关系通过所述专用隧道收发分流数据； 网络地址转换模块， 位于 NAT 网关， 用于执行分流数据报文的 NAT 转换， 并依据所述接续关系通过所述专用隧道转发分流数据。
8、 根据权利要求 7所述的装置， 其特征在于，
所述专用隧道管理模块建立的专用隧道为固定专用隧道； 所述分流数据处理模块依据的接续关系为： UE的 IP地址、 UE的无线 载链路 RAB及 UE的用户标识之间的对应关系；
所述网络地址转换模块依据的接续关系为： NAT表项、 UE的用户标识 以及专用隧道之间的对应关系。
9、 根据权利要求 8所述的装置， 其特征在于，
在 UE因为移动性发生小基站切换时，所述网络地址转换模块暂停对应 UE用户标识的下行分流数据报文的发送；
UE接入目标小基站后， 所述专用隧道管理模块依据用户标识修改针对 所述 UE的接续关系到目标小基站上。
10、 根据权利要求 7所述的装置， 其特征在于，
所述专用隧道管理模块建立的专用隧道为针对 UE的 RAB建立的临时 专用隧道；
所述分流数据处理模块依据的接续关系为： UE的用户标识、 专用隧道 以及 RAB之间的对应关系；
所述网络地址转换模块依据的接续关系为： NAT表项、 UE的用户标识、 专用隧道之间的对应关系。
11、 根据权利要求 10所述的装置， 其特征在于，
在 UE因为移动性发生小基站切换时，所述网络地址转换模块暂停对应 UE用户标识或隧道标识列表的下行分流数据报文的发送；
UE接入目标小基站后， 所述专用隧道管理模块为所述 UE建立新的专 用隧道， 依据 UE的用户标识修改对应的接续关系， 并在切换完成后， 删除 已失效的专用隧道。
12、 根据权利要求 7至 11所述的任一装置， 其特征在于， 所述用户标 识为国际移动用户标识 IMSI或临时移动用户标识 TMSI;
所述专用隧道所釆用的隧道协议为： 通用分组无线传输业务隧道协议 用户面部分 GTPU协议、或通用路由封装 GRE协议、或虚拟私有网络 VPN 协议、 或虚拟局域网 VLAN协议。
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