CN100502588C - Cell Handover Method Across Evolved Node Bs in Long Term Evolution Mobile Communication Network - Google Patents

Abstract

This invention discloses one long progress LTE mobile communication network over point B area switch method, witch comprises the following steps: network point gets the wireless materials control message before area switching; in interacting progress between GW and source encode and aim one executing the following steps: a, GW sending the message of UE to aim encode; b, aim encode aligns wireless materials according to UE RRC; c, GW sends business data to UE through source and aim encode till the switch order is fulfilled to send aim encode to business data.

Description

Translated fromChinese

长期演进移动通信网络中的跨演进节点B的小区切换方法Cell Handover Method Across Evolved Node Bs in Long Term Evolution Mobile Communication Network

技术领域technical field

本发明涉及一种长期演进(LTE)移动通信网络中的跨演进节点B的小区切换方法。The invention relates to a cell handover method across evolved Node Bs in a long-term evolution (LTE) mobile communication network.

背景技术Background technique

目前，长期演进(LTE)移动通信网络由传统的基站(NodeB)、无线网络控制器(RNC)和核心网(CN)的三层节点的网络结构，简化为了演进的NodeB(eNodeB)和eNodeB以上节点这种简单的两层节点结构，该网络结构参见图1，图1为简化的LTE移动通信网结构示意图。At present, the long-term evolution (LTE) mobile communication network is simplified from the traditional three-layer node network structure of base station (NodeB), radio network controller (RNC) and core network (CN) to evolved NodeB (eNodeB) and eNodeB The node is a simple two-layer node structure. The network structure is shown in FIG. 1 . FIG. 1 is a schematic diagram of a simplified LTE mobile communication network structure.

其中，eNodeB以上节点100也可以被称为网关节点(GW)或中央节点。各个eNodeB节点110之间无直接物理连接以便减少节点间的互连成本。用户设备(UE)与网络的eNodeB节点110建立无线资源控制(Radio ResourceControl，RRC)管理关系。eNodeB节点110包含RRC管理实体，负责处理维护RRC管理职能，并维护UE RRC上下文。eNodeB以上节点100维护无RRC连接下的UE管理，维护UE上下文(UE Context)。Wherein, the node above the eNodeB 100 may also be called a gateway node (GW) or a central node. There is no direct physical connection betweeneNodeB nodes 110 in order to reduce the interconnection cost between nodes. A user equipment (UE) establishes a radio resource control (Radio Resource Control, RRC) management relationship with theeNodeB node 110 of the network. TheeNodeB node 110 includes an RRC management entity, responsible for handling and maintaining RRC management functions, and maintaining UE RRC context. Nodes above the eNodeB 100 maintain UE management without RRC connection, and maintain UE context (UE Context).

UE通过eNodeB节点110和eNodeB以上节点100建立连接，实现语音通话或数据传输等移动通信业务。The UE establishes a connection with anode 100 above the eNodeB through theeNodeB node 110 to implement mobile communication services such as voice call or data transmission.

与在传统移动通信网络一样，UE在跨eNodeB小区移动过程中，会执行跨eNodeB小区切换过程。目前在LTE网中采用数据转发进行跨eNodeB小区切换的方法有实时性不能很好保证的缺陷。参见图2，图2为现有技术跨演进节点B的小区切换的处理流程图。该流程包括以下步骤：As in the traditional mobile communication network, when the UE moves across eNodeB cells, it will perform a handover process across eNodeB cells. At present, the method of using data forwarding to perform cross-eNodeB cell handover in the LTE network has the defect that the real-time performance cannot be well guaranteed. Referring to FIG. 2 , FIG. 2 is a flow chart of the processing of inter-eNodeB cell handover in the prior art. The process includes the following steps:

步骤201～202，小区切换前，GW将业务数据通过源eNodeB发送给UE。Steps 201-202, before the cell handover, the GW sends the service data to the UE through the source eNodeB.

步骤203，UE向源eNodeB发送针对源小区和目的小区的测量报告。In step 203, the UE sends measurement reports for the source cell and the target cell to the source eNodeB.

步骤204，源eNodeB根据UE的测量报告执行小区切换判决，当确定该UE的源小区和目的小区处于不同eNodeB，需要进行跨eNodeB小区切换时，执行步骤205，开始小区切换信令交互。In step 204, the source eNodeB performs a cell handover decision according to the measurement report of the UE. When it is determined that the source cell and the target cell of the UE are in different eNodeBs and inter-eNodeB cell handover is required, step 205 is executed to start the cell handover signaling interaction.

步骤205～206，源eNodeB通过GW向目标eNodeB发送需要进行小区切换的UE的RRC上下文和小区切换准备信令。In steps 205-206, the source eNodeB sends the RRC context of the UE that needs to perform cell handover and the cell handover preparation signaling to the target eNodeB through the GW.

步骤207，目标eNodeB根据该UE的RRC上下文，进行空口资源准备，为该UE分配无线资源。In step 207, the target eNodeB prepares air interface resources according to the RRC context of the UE, and allocates radio resources for the UE.

步骤208～209，目标eNodeB通过GW向源eNodeB发送切换准备完成信令。In steps 208-209, the target eNodeB sends a handover preparation completion signaling to the source eNodeB through the GW.

步骤210，源eNodeB向UE发送小区切换信令(HO command)。如果此时源eNodeB接收到GW发送给该要进行小区切换的UE的业务数据，则在发送小区切换信令的同时或发送小区切换信令后，执行步骤211。Step 210, the source eNodeB sends a cell handover signaling (HO command) to the UE. If at this time the source eNodeB receives the service data sent by the GW to the UE to perform cell handover, it executes step 211 while sending the cell handover signaling or after sending the cell handover signaling.

步骤211，源eNodeB将GW要发送给该要进行小区切换的UE的业务数据转发给GW，GW存储该业务数据。Step 211 , the source eNodeB forwards the service data to be sent by the GW to the UE to be handed over to the GW, and the GW stores the service data.

本步骤中，GW也可以将该业务数据转发给目标eNodeB，由目标eNodeB存储该业务数据。In this step, the GW may also forward the service data to the target eNodeB, and the target eNodeB stores the service data.

步骤212，UE接收到小区切换信令，通过目标小区同步到该目的eNodeB，向目标eNodeB发送小区切换完成信令。In step 212, the UE receives the cell handover signaling, synchronizes to the target eNodeB through the target cell, and sends a cell handover completion signaling to the target eNodeB.

步骤213～216，目标eNodeB通过GW向源eNodeB发送小区切换完成信令，源eNodeB释放为该UE分配的无线资源。In steps 213-216, the target eNodeB sends a cell handover completion signaling to the source eNodeB through the GW, and the source eNodeB releases the radio resources allocated for the UE.

其中，步骤214和215是在GW存储了从源eNodeB接收的该UE的业务数据的情况下执行。如果是目标eNodeB存储该业务数据，则只需要执行步骤215。如果没有存储该数据，则无需执行步骤214和215。Wherein, steps 214 and 215 are executed when the GW has stored the service data of the UE received from the source eNodeB. If the target eNodeB stores the service data, only step 215 needs to be performed. If the data is not stored, steps 214 and 215 need not be performed.

步骤217～218，小区切换信令交互完成，GW通过目标eNodeB向UE发送业务数据。In steps 217-218, the cell handover signaling interaction is completed, and the GW sends service data to the UE through the target eNodeB.

由上述的过程可见，目前在LTE网中进行跨eNodeB小区切换的方法，在UE由源eNodeB的小区切换到目标eNodeB的小区的过程中，为了减少数据损失，源eNodeB将切换过程中部分数据转发给GW，在GW收到切换完成信令后，将这部分数据通过目标eNodeB发给UE。这个过程虽然能够保证较低的丢包率，但却造成了处理时延过长、实时性差的问题，导致实时业务无法施展。It can be seen from the above process that in the current method of cross-eNodeB cell handover in the LTE network, in the process of UE handover from the cell of the source eNodeB to the cell of the target eNodeB, in order to reduce data loss, the source eNodeB forwards part of the data during the handover process To the GW, after the GW receives the handover completion signaling, it sends this part of the data to the UE through the target eNodeB. Although this process can guarantee a low packet loss rate, it causes problems such as long processing delay and poor real-time performance, which makes it impossible to implement real-time services.

发明内容Contents of the invention

有鉴于此，本发明的主要目的在于提供两种长期演进移动通信网络中的跨演进节点B的小区切换方法，提高跨演进节点B的小区切换的实时性。In view of this, the main purpose of the present invention is to provide cell handover methods across eNodeBs in two long term evolution mobile communication networks, and improve the real-time performance of cell handover across eNodeBs.

为达到上述目的，本发明的技术方案具体是这样实现的：In order to achieve the above object, the technical solution of the present invention is specifically realized in the following way:

一种长期演进LTE移动通信网络中的跨演进节点B的小区切换方法，网关节点GW在用户设备UE进行跨演进节点B eNodeB的小区切换前，获得该UE的无线资源控制RRC上下文；在GW与源eNodeB和目标eNodeB进行小区切换信令交互过程中，执行以下步骤：A cell handover method across evolved Node Bs in a long-term evolution LTE mobile communication network, the gateway node GW obtains the radio resource control RRC context of the UE before the user equipment UE performs cell handover across the evolved Node B eNodeB; During the cell handover signaling interaction between the source eNodeB and the target eNodeB, perform the following steps:

A、GW先将该UE的RRC上下文发送给目标eNodeB；A. The GW first sends the RRC context of the UE to the target eNodeB;

B、目标eNodeB根据该UE的RRC上下文，为该UE分配无线资源，并通过GW向源eNodeB转发小区切换准备完成信令；源eNodeB接收到该小区切换准备完成信令后，向GW发送双播启动信令；B. The target eNodeB allocates radio resources for the UE according to the RRC context of the UE, and forwards the cell handover preparation completion signaling to the source eNodeB through the GW; after receiving the cell handover preparation completion signaling, the source eNodeB sends a bicast to the GW start signaling;

C、GW接收到双播启动信令后，通过源eNodeB和目标eNodeB同时向UE发送业务数据，直到小区切换信令交互完成，GW再通过目标eNodeB向UE发送业务数据。C. After receiving the bicast start signaling, the GW sends service data to the UE through the source eNodeB and the target eNodeB at the same time, until the cell handover signaling interaction is completed, and then the GW sends service data to the UE through the target eNodeB.

其中，所述步骤A可以为：GW接收到UE的RRC上下文副本后，根据网络拓扑结构，将该UE的RRC上下文副本发送给所有可能的目标eNodeB；Wherein, the step A may be: after receiving the RRC context copy of the UE, the GW sends the RRC context copy of the UE to all possible target eNodeBs according to the network topology;

或GW在接收到源eNodeB发送的小区切换准备信令后，将该UE的RRC上下文随小区切换准备信令发送给目标eNodeB。Or, after receiving the cell handover preparation signaling sent by the source eNodeB, the GW sends the RRC context of the UE to the target eNodeB along with the cell handover preparation signaling.

源eNodeB是在根据UE发送的针对源小区和目的小区的测量报告，判决出该UE的源小区和目的小区处于不同eNodeB，需要进行跨eNodeB小区切换时，通过GW向目标eNodeB转发小区切换准备信令。The source eNodeB forwards the cell handover preparation signal to the target eNodeB through the GW when it is determined that the source cell and the target cell of the UE are in different eNodeBs based on the measurement reports sent by the UE, and inter-eNodeB cell handover is required. make.

所述小区切换准备完成信令中可以包含准备成功或准备失败指示；The cell handover preparation completion signaling may include an indication of preparation success or preparation failure;

所述步骤B进一步包括：源eNodeB接收到该小区切换准备完成信令后，判断其中包含准备成功指示还是准备失败指示，如果是准备成功指示，则向GW发送双播启动信令；如果是准备失败指示，则结束切换流程。The step B further includes: after the source eNodeB receives the cell handover preparation completion signaling, judge whether it contains a preparation success indication or a preparation failure indication, if it is a preparation success indication, then send a bicast start signaling to the GW; if it is a preparation failure indication, the handover process ends.

所述步骤B中，源eNodeB接收到该小区切换准备完成信令后，向UE发送小区切换信令；In the step B, after receiving the cell handover preparation completion signaling, the source eNodeB sends the cell handover signaling to the UE;

步骤C所述小区切换信令交互完成的过程为：The process of completing the cell handover signaling interaction in step C is:

UE接收到小区切换信令后，通过目标小区同步到目的eNodeB，并向该目的eNodeB发送小区切换完成信令；After receiving the cell handover signaling, the UE synchronizes to the target eNodeB through the target cell, and sends the cell handover completion signaling to the target eNodeB;

目的eNodeB将该小区切换完成信令通过GW发送给源eNodeB，小区切换信令交互完成。The target eNodeB sends the cell handover completion signaling to the source eNodeB through the GW, and the cell handover signaling interaction is completed.

该方法可以进一步包括：GW记录通过源eNodeB和目标eNodeB同时向UE发送业务数据的开始时间，如果GW在预定时间到时，没有接收到目的eNodeB向源eNodeB转发的小区切换完成信令，则停止通过源eNodeB和目标eNodeB同时向UE发送业务数据。The method may further include: the GW records the start time of simultaneously sending service data to the UE through the source eNodeB and the target eNodeB, and if the GW does not receive the cell handover completion signaling forwarded by the target eNodeB to the source eNodeB when the predetermined time expires, stop The service data is sent to the UE through the source eNodeB and the target eNodeB simultaneously.

GW在UE进行小区切换前，获得该UE的RRC上下文的方法可以为：Before the UE performs cell handover, the method for the GW to obtain the RRC context of the UE may be:

源eNodeB检测到UE移动到该eNodeB的边缘小区时，向GW发送该UE的RRC上下文副本；When the source eNodeB detects that the UE moves to the edge cell of the eNodeB, it sends the RRC context copy of the UE to the GW;

该方法进一步包括：当源eNodeB或目标eNodeB检测到UE从边缘小区移动到该eNodeB的非边缘小区时，通知GW删除该UE的RRC上下文副本。The method further includes: notifying the GW to delete the RRC context copy of the UE when the source eNodeB or the target eNodeB detects that the UE moves from the edge cell to the non-edge cell of the eNodeB.

一种长期演进LTE移动通信网络中的跨演进节点B的小区切换方法，网关节点GW在用户设备UE进行跨演进节点B eNodeB的小区切换前，获得该UE的无线资源控制RRC上下文；在GW与源eNodeB和目标eNodeB进行小区切换信令交互过程中，执行以下步骤：A cell handover method across evolved Node Bs in a long-term evolution LTE mobile communication network, the gateway node GW obtains the radio resource control RRC context of the UE before the user equipment UE performs cell handover across the evolved Node B eNodeB; During the cell handover signaling interaction between the source eNodeB and the target eNodeB, perform the following steps:

A、GW先将该UE的RRC上下文发送给目标eNodeB；A. The GW first sends the RRC context of the UE to the target eNodeB;

B、目标eNodeB根据该UE的RRC上下文，为该UE分配无线资源，并通过GW向源eNodeB转发小区切换准备完成信令；同时在延长预定时间后，向GW发送双播启动信令；B. The target eNodeB allocates radio resources for the UE according to the RRC context of the UE, and forwards the cell handover preparation completion signaling to the source eNodeB through the GW; at the same time, after extending the predetermined time, sends the bicast start signaling to the GW;

C、GW接收到双播启动信令后，通过源eNodeB和目标eNodeB同时向UE发送业务数据，直到小区切换信令交互完成，GW再通过目标eNodeB向UE发送业务数据。C. After receiving the bicast start signaling, the GW sends service data to the UE through the source eNodeB and the target eNodeB at the same time, until the cell handover signaling interaction is completed, and then the GW sends service data to the UE through the target eNodeB.

所述步骤A为：GW接收到UE的RRC上下文副本后，根据网络拓扑结构，将该UE的RRC上下文副本发送给所有可能的目标eNodeB；The step A is: after the GW receives the UE's RRC context copy, according to the network topology, the UE's RRC context copy is sent to all possible target eNodeBs;

或GW在接收到源eNodeB发送的小区切换准备信令后，将该UE的RRC上下文随小区切换准备信令发送给目标eNodeB。Or, after receiving the cell handover preparation signaling sent by the source eNodeB, the GW sends the RRC context of the UE to the target eNodeB along with the cell handover preparation signaling.

源eNodeB是在根据UE发送的针对源小区和目的小区的测量报告，判决出该UE的源小区和目的小区处于不同eNodeB，需要进行跨eNodeB小区切换时，通过GW向目标eNodeB转发小区切换准备信令。The source eNodeB forwards the cell handover preparation signal to the target eNodeB through the GW when it is determined that the source cell and the target cell of the UE are in different eNodeBs based on the measurement reports sent by the UE, and inter-eNodeB cell handover is required. make.

所述步骤B中，源eNodeB接收到该小区切换准备完成信令后，向UE发送小区切换信令；In the step B, after receiving the cell handover preparation completion signaling, the source eNodeB sends the cell handover signaling to the UE;

步骤C所述小区切换信令交互完成的过程为：The process of completing the cell handover signaling interaction in step C is:

UE接收到小区切换信令后，通过目标小区同步到目的eNodeB，并向该目的eNodeB发送小区切换完成信令；After receiving the cell handover signaling, the UE synchronizes to the target eNodeB through the target cell, and sends the cell handover completion signaling to the target eNodeB;

目的eNodeB将该小区切换完成信令通过GW发送给源eNodeB，小区切换信令交互完成。The target eNodeB sends the cell handover completion signaling to the source eNodeB through the GW, and the cell handover signaling interaction is completed.

该方法进一步包括：The method further includes:

GW记录通过源eNodeB和目标eNodeB同时向UE发送业务数据的开始时间，如果GW在预定时间到时，没有接收到目的eNodeB向源eNodeB转发的小区切换完成信令，则停止通过源eNodeB和目标eNodeB同时向UE发送业务数据。The GW records the start time of simultaneously sending service data to the UE through the source eNodeB and the target eNodeB. If the GW does not receive the cell handover completion signaling forwarded by the target eNodeB to the source eNodeB when the predetermined time is up, the GW stops passing through the source eNodeB and the target eNodeB. At the same time, service data is sent to the UE.

GW在UE进行小区切换前，获得该UE的RRC上下文的方法为：Before the UE performs cell handover, the method for the GW to obtain the RRC context of the UE is as follows:

源eNodeB检测到UE移动到该eNodeB的边缘小区时，向GW发送该UE的RRC上下文副本；When the source eNodeB detects that the UE moves to the edge cell of the eNodeB, it sends the RRC context copy of the UE to the GW;

该方法进一步包括：当源eNodeB或目标eNodeB检测到UE从边缘小区移动到该eNodeB的非边缘小区时，通知GW删除该UE的RRC上下文副本。The method further includes: notifying the GW to delete the RRC context copy of the UE when the source eNodeB or the target eNodeB detects that the UE moves from the edge cell to the non-edge cell of the eNodeB.

由上述的技术方案可见，本发明的这种长期演进移动通信网络中的跨演进节点B的小区切换方法，GW在切换前获得UE的RRC上下文，且GW与源eNodeB和目标eNodeB进行小区切换信令交互过程中，先将该UE的RRC上下文发送给目标eNodeB，目标eNodeB根据该RRC上下文为该UE分配无线资源，然后GW通过源eNodeB和目标eNodeB向UE发送业务数据，直到小区切换信令交互完成，GW再通过目标eNodeB向UE发送业务数据。It can be seen from the above technical solution that in the cell handover method across eNodeBs in the long-term evolution mobile communication network of the present invention, the GW obtains the RRC context of the UE before the handover, and the GW performs cell handover communication with the source eNodeB and the target eNodeB. In the command interaction process, the RRC context of the UE is first sent to the target eNodeB, and the target eNodeB allocates radio resources for the UE according to the RRC context, and then the GW sends service data to the UE through the source eNodeB and the target eNodeB until the cell handover signaling interaction After completion, the GW sends service data to the UE through the target eNodeB.

这样，在小区切换过程中传输的业务数据可以通过源eNodeB和目标eNodeB发送给UE，不需要GW转发源eNodeB在切换过程中发送给UE的业务数据，因此，不会出现因业务数据转发带来的时延。可见，本发明的这种长期演进移动通信网络中的跨演进节点B的小区切换方法，具有很强的时序性，能够提高跨演进节点B的小区切换的实时性，满足实时业务对实时性的要求。In this way, the service data transmitted during the cell handover process can be sent to the UE through the source eNodeB and the target eNodeB, and there is no need for the GW to forward the service data sent by the source eNodeB to the UE during the handover process. delay. It can be seen that the inter-evolved node B cell handover method in the long-term evolution mobile communication network of the present invention has strong timing, can improve the real-time performance of cross-evolved node B cell handover, and satisfies the requirements of real-time services on real-time performance. Require.

附图说明Description of drawings

图1为简化的LTE移动通信网结构示意图；Fig. 1 is a schematic diagram of a simplified LTE mobile communication network structure;

图2为现有技术跨演进节点B的小区切换的处理流程图；Fig. 2 is a processing flowchart of cell handover across evolved Node Bs in the prior art;

图3为本发明第一较佳实施例的跨演进节点B的小区切换的处理流程图；Fig. 3 is a flow chart of the processing of inter-eNode B cell handover according to the first preferred embodiment of the present invention;

图4为本发明第二较佳实施例的跨演进节点B的小区切换的处理流程图；FIG. 4 is a flow chart of the process of inter-eNode B cell handover according to the second preferred embodiment of the present invention;

图5为本发明第三较佳实施例的跨演进节点B的小区切换的处理流程图。Fig. 5 is a flow chart of the process of inter-eNodeB cell handover according to the third preferred embodiment of the present invention.

具体实施方式Detailed ways

为使本发明的目的、技术方案及优点更加清楚明白，以下参照附图并举实施例，对本发明进一步详细说明。In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and examples.

本发明的这种长期演进LTE移动通信网络中的跨演进节点B的小区切换方法，GW在切换前获得UE的RRC上下文，且GW与源eNodeB和目标eNodeB进行小区切换信令交互过程中，先将该UE的RRC上下文发送给目标eNodeB，目标eNodeB根据该RRC上下文为该UE分配无线资源，然后GW通过源eNodeB和目标eNodeB向UE发送业务数据，直到小区切换信令交互完成，GW再通过目标eNodeB向UE发送业务数据。In the inter-evolved Node B cell handover method in the Long Term Evolution LTE mobile communication network of the present invention, the GW obtains the RRC context of the UE before the handover, and during the cell handover signaling interaction between the GW and the source eNodeB and the target eNodeB, first Send the RRC context of the UE to the target eNodeB, and the target eNodeB allocates radio resources for the UE according to the RRC context, and then the GW sends service data to the UE through the source eNodeB and the target The eNodeB sends service data to the UE.

以下举三个较佳实施例对本发明进行详细说明。Three preferred embodiments are given below to describe the present invention in detail.

第一较佳实施例：First preferred embodiment:

本实施例中GW在切换前获得了需要切换的UE的RRC上下文，并使用专用的双播启动信令，在与源eNodeB和目标eNodeB进行小区切换信令交互过程中，GW通过源eNodeB和目标eNodeB同时向UE发送业务数据，直到小区切换信令交互完成。参见图3，图3为本发明第一较佳实施例的跨基站跨演进节点B的小区切换的处理流程图。该流程包括以下步骤：In this embodiment, the GW obtains the RRC context of the UE that needs to be handed over before the handover, and uses dedicated bicast start signaling. During the cell handover signaling interaction process with the source eNodeB and the target eNodeB, the GW passes the The eNodeB sends service data to the UE at the same time until the cell handover signaling interaction is completed. Referring to FIG. 3 , FIG. 3 is a flowchart of the processing of inter-eNB inter-eNodeB cell handover according to the first preferred embodiment of the present invention. The process includes the following steps:

步骤301～302，小区切换前，GW将业务数据通过源eNodeB发送给UE。In steps 301-302, before the cell handover, the GW sends the service data to the UE through the source eNodeB.

步骤303，UE向源eNodeB发送针对源小区和目的小区的测量报告。In step 303, the UE sends measurement reports for the source cell and the target cell to the source eNodeB.

步骤304，源eNodeB根据UE的测量报告执行小区切换判决，当确定该UE的源小区和目的小区处于不同eNodeB，需要进行跨eNodeB小区切换时，执行步骤305，开始小区切换信令交互。In step 304, the source eNodeB performs a cell handover decision according to the measurement report of the UE. When it is determined that the source cell and the target cell of the UE are in different eNodeBs, and inter-eNodeB cell handover is required, step 305 is executed to start the cell handover signaling interaction.

步骤305，源eNodeB向GW发送包含UE信息的小区切换准备信令。Step 305, the source eNodeB sends a cell handover preparation signaling including UE information to the GW.

步骤306，GW根据该UE信息从已获得的需要切换的UE的RRC上下文中，找出该UE的RRC上下文，将该UE的RRC上下文和小区切换准备信令发送给目标eNodeB。Step 306 , the GW finds out the RRC context of the UE from the obtained RRC context of the UE that needs to be handed over according to the UE information, and sends the RRC context of the UE and the cell handover preparation signaling to the target eNodeB.

实际上，由于GW知道网络的拓扑结构，当GW接收到一个UE的RRC上下文副本后，可以根据网络拓扑结构，获知与该UE当前所在小区相邻小区所处的eNodeB，这些eNodeB(可能是一个也可能是多个)就是该UE可能的目标eNodeB。因此，GW可以将该UE的RRC上下文副本在切换前预先发送给所有可能的目标eNodeB。这种情况下，本步骤只需将该UE的小区切换准备信令发送给目标eNodeB即可。In fact, since the GW knows the topology of the network, when the GW receives a copy of the RRC context of a UE, it can learn the eNodeBs in the adjacent cells of the cell where the UE is currently located according to the network topology. These eNodeBs (maybe a There may be more than one) is the possible target eNodeB of the UE. Therefore, the GW can send the RRC context copy of the UE to all possible target eNodeBs before handover. In this case, this step only needs to send the cell handover preparation signaling of the UE to the target eNodeB.

步骤307，目标eNodeB根据该UE的RRC上下文，进行空口资源准备，为该UE分配无线资源。In step 307, the target eNodeB prepares air interface resources according to the RRC context of the UE, and allocates radio resources for the UE.

步骤308～309，目标eNodeB通过GW向源eNodeB发送切换准备完成信令。本实施例中的切换准备完成信令中还可以包含准备成功指示还是准备失败指示。In steps 308-309, the target eNodeB sends a handover preparation completion signaling to the source eNodeB through the GW. The handover preparation completion signaling in this embodiment may also include an indication of preparation success or preparation failure.

步骤310，源eNodeB向GW发送双播启动信令，同时或在发送双播启动信令后，执行步骤311。In step 310, the source eNodeB sends a bicast start signaling to the GW, and at the same time or after sending the bicast start signaling, step 311 is executed.

本步骤中，如果切换准备完成信令还包含了准备成功指示还是准备失败指示，则源eNodeB在接收到该小区切换准备完成信令后，先判断其中包含准备成功指示还是准备失败指示，如果是准备成功指示，则向GW发送双上广播启动信令；如果是准备失败指示，则结束切换流程。In this step, if the handover preparation completion signaling also includes a preparation success indication or a preparation failure indication, the source eNodeB first judges whether it contains a preparation success indication or a preparation failure indication after receiving the cell handover preparation completion signaling. If the preparation is successful, send a dual broadcast start signaling to the GW; if it is a preparation failure, end the handover process.

步骤311，源eNodeB向UE发送小区切换信令。Step 311, the source eNodeB sends a cell switching signaling to the UE.

步骤312～313，GW接收到双播启动信令后，启动双播过程，同时向源eNodeB和目标eNodeB两个eNodeB发送数据，这种双向发送的数据流可以称为Bi-Casting数据流，上述的双播启动信令可以称为Bi-Casting启动信令。In steps 312-313, after receiving the bicast start signaling, the GW starts the bicast process, and simultaneously sends data to both the source eNodeB and the target eNodeB. This bidirectionally sent data flow can be called a Bi-Casting data flow. The bicast start signaling can be referred to as Bi-Casting start signaling.

由于空口传输/处理比网络接口传输/处理慢，所以UE在接受小区切换信令，发起切换同步到目标eNodeB时，目标eNodeB已经获得GW的Bi-Casting数据流。Since the air interface transmission/processing is slower than the network interface transmission/processing, when the UE receives the cell handover signaling and initiates handover synchronization to the target eNodeB, the target eNodeB has already obtained the Bi-Casting data stream of the GW.

源eNodeB和目标eNodeB接收到数据后，分别向UE发送业务数据，这种情况下，如果UE自身还没有完成切换，仍处于源eNodeB下，则只接收源eNodeB发送的业务数据，如果UE自身已完成切换，已处于目的eNodeB下，则只接收目的eNodeB发送的业务数据。After the source eNodeB and the target eNodeB receive the data, they send service data to the UE respectively. In this case, if the UE has not completed the handover and is still under the source eNodeB, it only receives the service data sent by the source eNodeB. If the UE itself has After the handover is completed, it is already under the target eNodeB, and only receives the service data sent by the target eNodeB.

此外。本步骤中，还可以记录同时发送的开始时间。also. In this step, the start time of simultaneous sending can also be recorded.

步骤314，UE接收到源eNodeB发送的小区切换信令后，通过目标小区同步到该目的eNodeB，向目标eNodeB发送小区切换完成信令。Step 314, after receiving the cell switching signaling sent by the source eNodeB, the UE synchronizes to the target eNodeB through the target cell, and sends a cell switching completion signaling to the target eNodeB.

步骤315～318，目标eNodeB向GW发送小区切换完成信令，GW收到该小区切换完成信令，就开始通过目标eNodeB向UE发送业务数据，向源eNodeB转发小区切换完成信令，小区切换信令交互完成，源eNodeB释放为该UE分配的无线资源。In steps 315-318, the target eNodeB sends the cell handover completion signaling to the GW. After receiving the cell handover completion signaling, the GW starts to send service data to the UE through the target eNodeB, forwards the cell handover completion signaling to the source eNodeB, and the cell handover signal After the interaction is completed, the source eNodeB releases the radio resources allocated for the UE.

本实施例中，GW可以采用以下的方法在切换前获得需要切换的UE的RRC上下文：源eNodeB检测到UE移动到该eNodeB的边缘小区时，向GW发送该UE的RRC上下文副本；当源eNodeB或目标eNodeB检测到UE从边缘小区移动到该eNodeB的非边缘小区时，通知GW删除该UE的RRC上下文副本。In this embodiment, the GW can use the following method to obtain the RRC context of the UE that needs to be handed over: when the source eNodeB detects that the UE has moved to the edge cell of the eNodeB, it sends a copy of the RRC context of the UE to the GW; when the source eNodeB Or when the target eNodeB detects that the UE moves from the edge cell to the non-edge cell of the eNodeB, it notifies the GW to delete the RRC context copy of the UE.

另外，本实施例中，GW还可以记录同时向源eNodeB和目的eNodeB发送数据的开始时间，如果GW在预定时间到时，还没有接收到目的eNodeB向源eNodeB转发的小区切换完成信令，则停止通过同时向UE发送业务数据。In addition, in this embodiment, the GW can also record the start time of sending data to the source eNodeB and the target eNodeB at the same time. If the GW has not received the cell handover completion signaling forwarded by the target eNodeB to the source eNodeB when the predetermined time is up, then Stop sending service data to UE at the same time.

本实施例由于启动双播进行数据传输的实际并非提前很多，所以占用网络传输资源量并不太多，且由于有容错机制GW可以在流程异常时结束双播数据传输处理，因此不会造成很大系统资源浪费。In this embodiment, since the start of bicast for data transmission is not much in advance, the network transmission resources are not occupied too much, and because of the fault tolerance mechanism, GW can end the bicast data transmission process when the process is abnormal, so it will not cause a lot of trouble. Waste of large system resources.

第二较佳实施例：Second preferred embodiment:

本实施例与第一较佳实施例相同，GW在切换前获得了需要切换的UE的RRC上下文，并使用专用的双播启动信令，只是不由源eNodeB发送双播启动信令而是由目标eNodeB发送。具体过程参见图4，图4为本发明第二较佳实施例的跨基站跨演进节点B的小区切换的处理流程图。该流程包括以下步骤：This embodiment is the same as the first preferred embodiment, the GW obtains the RRC context of the UE that needs to be handed over before the handover, and uses a dedicated bicast start signaling, except that the source eNodeB does not send the bicast start signaling but the target eNodeB sends. Refer to FIG. 4 for the specific process. FIG. 4 is a flow chart of cell handover between base stations and eNodeBs according to the second preferred embodiment of the present invention. The process includes the following steps:

步骤401～步骤408，与图3所示步骤301～步骤308完全相同，这里不再重复说明。Steps 401 to 408 are exactly the same as steps 301 to 308 shown in FIG. 3 , and will not be repeated here.

步骤409，目标eNodeB启动一个定时器，当预定延长时间到时，执行步骤410。In step 409, the target eNodeB starts a timer, and when the predetermined extension time expires, step 410 is executed.

步骤410，目标eNodeB向GW发送双播启动信令。Step 410, the target eNodeB sends a bicast start signaling to the GW.

步骤411，GW接收到小区切换准备完成信令后，将其转发给源eNodeB。Step 411, after receiving the cell handover preparation completion signaling, the GW forwards it to the source eNodeB.

步骤412，源eNodeB接收到小区切换准备完成信令后，向UE发送小区切换信令。In step 412, the source eNodeB sends the cell switching signaling to the UE after receiving the cell switching preparation completion signaling.

步骤413～步骤414，GW接收到双播启动信令后，启动双播过程，同时向两个eNodeB发送业务数据。In steps 413 to 414, after receiving the bicast start signaling, the GW starts a bicast process and sends service data to two eNodeBs at the same time.

步骤415，UE接收到源eNodeB发送的小区切换信令后，通过目标小区同步到该目的eNodeB，向目标eNodeB发送小区切换完成信令。Step 415, after receiving the cell switching signaling sent by the source eNodeB, the UE synchronizes to the target eNodeB through the target cell, and sends a cell switching completion signaling to the target eNodeB.

步骤416～419，目标eNodeB向GW发送小区切换完成信令，GW收到该小区切换完成信令，就开始通过目标eNodeB向UE发送业务数据，并向源eNodeB转发小区切换完成信令，小区切换信令交互完成，源eNodeB释放为该UE分配的无线资源。Steps 416-419, the target eNodeB sends the cell switching completion signaling to the GW, and the GW starts to send the service data to the UE through the target eNodeB after receiving the cell switching completion signaling, and forwards the cell switching completion signaling to the source eNodeB, and the cell switching After the signaling interaction is completed, the source eNodeB releases the radio resources allocated for the UE.

另外，本实施例中，GW还可以记录同时向源eNodeB和目的eNodeB发送数据的开始时间，如果GW在预定时间到时，还没有接收到目的eNodeB向源eNodeB转发的小区切换完成信令，则停止对源eNodeB和目标eNodeB的双播过程。In addition, in this embodiment, the GW can also record the start time of sending data to the source eNodeB and the target eNodeB at the same time. If the GW has not received the cell handover completion signaling forwarded by the target eNodeB to the source eNodeB when the predetermined time is up, then Stop the bicast process to the source eNodeB and the target eNodeB.

本实施例在准备成功后，经过延时再启动双播过程进行数据传输，延时的时间必须预先设定好，图4是一种理想状态，GW在UE接收到小区切换信令后，启动双播过程进行数据传输。但是由于网络等原因，UE接收到小区切换信令的时间不十分确定，这种情况下，用于延时的定时器的定时时间很难非常准确地保证UE接收到小区切换信令。In this embodiment, after the preparation is successful, the dual-cast process is started after a delay for data transmission. The delay time must be set in advance. Figure 4 is an ideal state. After the UE receives the cell switching signaling, the GW starts Bicast process for data transmission. However, due to reasons such as the network, the time when the UE receives the cell switching signaling is not very certain. In this case, it is difficult to ensure that the UE receives the cell switching signaling very accurately with the timing of the timer used for the delay.

如果本实施例在准备成功后，不经过延时立即开始启动双播过程进行数据传输，则相对UE开始切换到目标eNodeB来说开始的时机较早，浪费网络传输资源和空中资源较多。因此，本实施例的效果不如第一较佳实施例。If the present embodiment starts the bicast process for data transmission immediately after successful preparation without delay, then the start time is earlier than when the UE starts handover to the target eNodeB, and more network transmission resources and air resources are wasted. Therefore, the effect of this embodiment is not as good as that of the first preferred embodiment.

第三较佳实施例：The third preferred embodiment:

本实施例中GW在切换前获得了需要切换的UE的RRC上下文，不使用专用的双播启动信令，GW解析出目标eNodeB发送的小区切换准备完成信令后，将该小区切换准备完成信令转发给源eNodeB时，启动双播过程进行数据传输。具体过程参见图5，图5为本发明第三较佳实施例的跨演进节点B的小区切换的处理流程图。该流程包括以下步骤：In this embodiment, the GW obtains the RRC context of the UE that needs to be handed over before the handover, and does not use a dedicated bicast start signaling. After the GW parses the cell handover preparation completion signaling sent by the target eNodeB, the cell handover preparation completion signal is used. When forwarding the command to the source eNodeB, start the bicast process for data transmission. Refer to FIG. 5 for the specific process. FIG. 5 is a flow chart of cell handover across eNodeBs according to the third preferred embodiment of the present invention. The process includes the following steps:

步骤501～步骤507，与图3所示步骤301～步骤307完全相同，这里不再重复说明。Steps 501 to 507 are exactly the same as steps 301 to 307 shown in FIG. 3 , and will not be repeated here.

步骤508，GW对所有从目标eNodeB接收的，要转发给源eNodeB的信令进行解析。In step 508, the GW analyzes all signaling received from the target eNodeB and to be forwarded to the source eNodeB.

步骤509，GW解析出小区切换准备完成信令后，将其转发给源eNodeB，同时执行步骤510。In step 509, the GW parses out the cell handover preparation completion signaling, forwards it to the source eNodeB, and executes step 510 at the same time.

步骤510～511，GW接收到双播启动信令后，启动双播过程，同时向两个eNodeB发送业务数据。In steps 510-511, after receiving the bicast start signaling, the GW starts a bicast process and sends service data to two eNodeBs at the same time.

步骤512，源eNodeB接收到小区切换准备完成信令后，向UE发送小区切换信令。In step 512, the source eNodeB sends the cell switching signaling to the UE after receiving the cell switching preparation completion signaling.

步骤513，UE接收到源eNodeB发送的小区切换信令后，通过目标小区同步到该目的eNodeB，向目标eNodeB发送小区切换完成信令。Step 513, after receiving the cell handover signaling sent by the source eNodeB, the UE synchronizes to the target eNodeB through the target cell, and sends a cell handover completion signaling to the target eNodeB.

步骤514～517，目标eNodeB向GW发送小区切换完成信令。GW收到该小区切换完成信令，就开始通过目标eNodeB向UE发送业务数据，并向源eNodeB转发小区切换完成信令，小区切换信令交互完成，源eNodeB释放为该UE分配的无线资源。In steps 514-517, the target eNodeB sends a cell handover completion signaling to the GW. After receiving the cell handover completion signaling, the GW starts to send service data to the UE through the target eNodeB, and forwards the cell handover completion signaling to the source eNodeB. After the cell handover signaling interaction is completed, the source eNodeB releases the radio resources allocated for the UE.

本实施例中，相对UE开始切换到目标eNodeB来说，启动双播进行数据传输的时机较早，造成浪费网络传输资源和空中资源较多。另外，由于需要解析不同的信令，使得处理开销增大，造成了不必要的系统资源浪费。因此，本实施例的效果不如第一较佳实施例。In this embodiment, compared with UE starting to handover to the target eNodeB, the time to start bicast for data transmission is earlier, resulting in more waste of network transmission resources and air resources. In addition, since different signaling needs to be parsed, the processing overhead is increased, resulting in unnecessary waste of system resources. Therefore, the effect of this embodiment is not as good as that of the first preferred embodiment.

上述三个实施例中，GW还可以记录通过源eNodeB和目的eNodeB同时向UE发送数据的开始时间，并启动定时器开始定时，如果GW在预定时间到时，还没有接收到目的eNodeB向源eNodeB转发的小区切换完成信令，则停止通过源eNodeB和目标eNodeB同时向UE发送业务数据。In the above three embodiments, the GW can also record the start time of simultaneously sending data to the UE through the source eNodeB and the target eNodeB, and start a timer to start timing. If the cell handover completion signaling is forwarded, the simultaneous sending of service data to the UE through the source eNodeB and the target eNodeB is stopped.

由图3、图4、图5的流程可见，上述三个较佳实施例中，图3所示的第一较佳实施例是最佳的实施例，实际应用中，推荐使用该方法。It can be seen from the flow charts in FIG. 3 , FIG. 4 , and FIG. 5 that among the above three preferred embodiments, the first preferred embodiment shown in FIG. 3 is the best embodiment, and it is recommended to use this method in practical applications.

由上述的实施例可见，本发明的这种长期演进移动通信网络中的跨演进节点B的小区切换方法，具有很强的时序性，能够提高跨演进节点B的小区切换的实时性，满足实时业务对实时性的要求。It can be seen from the above-mentioned embodiments that the cell handover method across eNodeBs in the long-term evolution mobile communication network of the present invention has strong timing, can improve the real-time performance of cell handover across eNodeBs, and satisfies real-time Business requirements for real-time performance.

Claims (13)

Translated fromChinese

1、一种长期演进LTE移动通信网络中的跨演进节点B的小区切换方法，其特征在于：网关节点GW在用户设备UE进行跨演进节点B eNodeB的小区切换前，获得该UE的无线资源控制RRC上下文；在GW与源eNodeB和目标eNodeB进行小区切换信令交互过程中，执行以下步骤：1. A cell handover method across evolved Node Bs in a Long Term Evolution LTE mobile communication network, characterized in that: the gateway node GW obtains the radio resource control of the UE before the user equipment UE performs cell handover across evolved Node B eNodeBs RRC context; during the cell handover signaling interaction process between the GW and the source eNodeB and target eNodeB, the following steps are performed:A、GW先将该UE的RRC上下文发送给目标eNodeB；A. The GW first sends the RRC context of the UE to the target eNodeB;B、目标eNodeB根据该UE的RRC上下文，为该UE分配无线资源，并通过GW向源eNodeB转发小区切换准备完成信令；源eNodeB接收到该小区切换准备完成信令后，向GW发送双播启动信令；B. The target eNodeB allocates radio resources for the UE according to the RRC context of the UE, and forwards the cell handover preparation completion signaling to the source eNodeB through the GW; after receiving the cell handover preparation completion signaling, the source eNodeB sends a bicast to the GW start signaling;C、GW接收到双播启动信令后，通过源eNodeB和目标eNodeB同时向UE发送业务数据，直到小区切换信令交互完成，GW再通过目标eNodeB向UE发送业务数据。C. After receiving the bicast start signaling, the GW sends service data to the UE through the source eNodeB and the target eNodeB at the same time, until the cell handover signaling interaction is completed, and then the GW sends service data to the UE through the target eNodeB.2、如权利要求1所述的跨演进节点B的小区切换方法，其特征在于，所述步骤A为：GW接收到UE的RRC上下文副本后，根据网络拓扑结构，将该UE的RRC上下文副本发送给所有可能的目标eNodeB；2. The cell handover method across evolved Node Bs according to claim 1, wherein the step A is: after the GW receives the RRC context copy of the UE, according to the network topology, the RRC context copy of the UE is sent to all possible target eNodeBs;或GW在接收到源eNodeB发送的小区切换准备信令后，将该UE的RRC上下文随小区切换准备信令发送给目标eNodeB。Or, after receiving the cell handover preparation signaling sent by the source eNodeB, the GW sends the RRC context of the UE to the target eNodeB along with the cell handover preparation signaling.3、如权利要求1所述的跨演进节点B的小区切换方法，其特征在于：源eNodeB是在根据UE发送的针对源小区和目的小区的测量报告，判决出该UE的源小区和目的小区处于不同eNodeB，需要进行跨eNodeB小区切换时，通过GW向目标eNodeB转发小区切换准备信令。3. The cell handover method across eNodeBs according to claim 1, wherein the source eNodeB determines the source cell and the target cell of the UE according to the measurement report sent by the UE for the source cell and the target cell In different eNodeBs, when inter-eNodeB cell handover is required, the GW forwards the cell handover preparation signaling to the target eNodeB.4、如权利要求1所述的跨演进节点B的小区切换方法，其特征在于，所述小区切换准备完成信令中包含准备成功或准备失败指示；4. The cell handover method across evolved Node Bs according to claim 1, wherein the cell handover preparation completion signaling includes an indication of preparation success or preparation failure;所述步骤B进一步包括：源eNodeB接收到该小区切换准备完成信令后，判断其中包含准备成功指示还是准备失败指示，如果是准备成功指示，则向GW发送双播启动信令；如果是准备失败指示，则结束切换流程。The step B further includes: after the source eNodeB receives the cell handover preparation completion signaling, judge whether it contains a preparation success indication or a preparation failure indication, if it is a preparation success indication, then send a bicast start signaling to the GW; if it is a preparation failure indication, the handover process ends.5、如权利要求1所述的跨演进节点B的小区切换方法，其特征在于：所述步骤B中，源eNodeB接收到该小区切换准备完成信令后，向UE发送小区切换信令；5. The cell handover method across evolved Node Bs according to claim 1, characterized in that: in the step B, the source eNodeB sends the cell handover signaling to the UE after receiving the cell handover preparation completion signaling;步骤C所述小区切换信令交互完成的过程为：The process of completing the cell handover signaling interaction in step C is:UE接收到小区切换信令后，通过目标小区同步到目的eNodeB，并向该目的eNodeB发送小区切换完成信令；After receiving the cell handover signaling, the UE synchronizes to the target eNodeB through the target cell, and sends the cell handover completion signaling to the target eNodeB;目的eNodeB将该小区切换完成信令通过GW发送给源eNodeB，小区切换信令交互完成。The target eNodeB sends the cell handover completion signaling to the source eNodeB through the GW, and the cell handover signaling interaction is completed.6、如权利要求1所述的跨演进节点B的小区切换方法，其特征在于，该方法进一步包括：6. The cell handover method across eNodeBs according to claim 1, characterized in that the method further comprises:GW记录通过源eNodeB和目标eNodeB同时向UE发送业务数据的开始时间，如果GW在预定时间到时，没有接收到目的eNodeB向源eNodeB转发的小区切换完成信令，则停止通过源eNodeB和目标eNodeB同时向UE发送业务数据。The GW records the start time of simultaneously sending service data to the UE through the source eNodeB and the target eNodeB. If the GW does not receive the cell handover completion signaling forwarded by the target eNodeB to the source eNodeB when the predetermined time is up, the GW stops passing through the source eNodeB and the target eNodeB. At the same time, service data is sent to the UE.7、如权利要求1所述的跨演进节点B的小区切换方法，其特征在于，GW在UE进行小区切换前，获得该UE的RRC上下文的方法为：7. The cell handover method across eNodeBs according to claim 1, wherein the method for the GW to obtain the RRC context of the UE before the UE performs cell handover is:源eNodeB检测到UE移动到该eNodeB的边缘小区时，向GW发送该UE的RRC上下文副本；When the source eNodeB detects that the UE moves to the edge cell of the eNodeB, it sends the RRC context copy of the UE to the GW;该方法进一步包括：当源eNodeB或目标eNodeB检测到UE从边缘小区移动到该eNodeB的非边缘小区时，通知GW删除该UE的RRC上下文副本。The method further includes: notifying the GW to delete the RRC context copy of the UE when the source eNodeB or the target eNodeB detects that the UE moves from the edge cell to the non-edge cell of the eNodeB.8、一种长期演进LTE移动通信网络中的跨演进节点B的小区切换方法，其特征在于：网关节点GW在用户设备UE进行跨演进节点B eNodeB的小区切换前，获得该UE的无线资源控制RRC上下文；在GW与源eNodeB和目标eNodeB进行小区切换信令交互过程中，执行以下步骤：8. A cell handover method across evolved Node Bs in a Long Term Evolution LTE mobile communication network, characterized in that: the gateway node GW obtains the radio resource control of the UE before the user equipment UE performs cell handover across evolved Node B eNodeBs RRC context; during the cell handover signaling interaction process between the GW and the source eNodeB and target eNodeB, the following steps are performed:A、GW先将该UE的RRC上下文发送给目标eNodeB；A. The GW first sends the RRC context of the UE to the target eNodeB;B、目标eNodeB根据该UE的RRC上下文，为该UE分配无线资源，并通过GW向源eNodeB转发小区切换准备完成信令；同时在延长预定时间后，向GW发送双播启动信令；B. The target eNodeB allocates radio resources for the UE according to the RRC context of the UE, and forwards the cell handover preparation completion signaling to the source eNodeB through the GW; at the same time, after extending the predetermined time, sends the bicast start signaling to the GW;C、GW接收到双播启动信令后，通过源eNodeB和目标eNodeB同时向UE发送业务数据，直到小区切换信令交互完成，GW再通过目标eNodeB向UE发送业务数据。C. After receiving the bicast start signaling, the GW sends service data to the UE through the source eNodeB and the target eNodeB at the same time, until the cell handover signaling interaction is completed, and then the GW sends service data to the UE through the target eNodeB.9、如权利要求8所述的跨演进节点B的小区切换方法，其特征在于，所述步骤A为：GW接收到UE的RRC上下文副本后，根据网络拓扑结构，将该UE的RRC上下文副本发送给所有可能的目标eNodeB；9. The method for cell handover across evolved Node Bs according to claim 8, wherein the step A is: after the GW receives the RRC context copy of the UE, according to the network topology, the RRC context copy of the UE is sent to all possible target eNodeBs;或GW在接收到源eNodeB发送的小区切换准备信令后，将该UE的RRC上下文随小区切换准备信令发送给目标eNodeB。Or, after receiving the cell handover preparation signaling sent by the source eNodeB, the GW sends the RRC context of the UE to the target eNodeB along with the cell handover preparation signaling.10、如权利要求8所述的跨演进节点B的小区切换方法，其特征在于：源eNodeB是在根据UE发送的针对源小区和目的小区的测量报告，判决出该UE的源小区和目的小区处于不同eNodeB，需要进行跨eNodeB小区切换时，通过GW向目标eNodeB转发小区切换准备信令。10. The cell handover method across evolved Node Bs according to claim 8, wherein the source eNodeB determines the source cell and the target cell of the UE according to the measurement report sent by the UE for the source cell and the target cell In different eNodeBs, when inter-eNodeB cell handover is required, the GW forwards the cell handover preparation signaling to the target eNodeB.11、如权利要求8所述的跨演进节点B的小区切换方法，其特征在于：所述步骤B中，源eNodeB接收到该小区切换准备完成信令后，向UE发送小区切换信令；11. The cell handover method across evolved Node Bs according to claim 8, characterized in that: in the step B, the source eNodeB sends the cell handover signaling to the UE after receiving the cell handover preparation completion signaling;步骤C所述小区切换信令交互完成的过程为：The process of completing the cell handover signaling interaction in step C is:UE接收到小区切换信令后，通过目标小区同步到目的eNodeB，并向该目的eNodeB发送小区切换完成信令；After receiving the cell handover signaling, the UE synchronizes to the target eNodeB through the target cell, and sends the cell handover completion signaling to the target eNodeB;目的eNodeB将该小区切换完成信令通过GW发送给源eNodeB，小区切换信令交互完成。The target eNodeB sends the cell handover completion signaling to the source eNodeB through the GW, and the cell handover signaling interaction is completed.12、如权利要求8所述的跨演进节点B的小区切换方法，其特征在于，该方法进一步包括：12. The cell handover method across evolved Node Bs according to claim 8, characterized in that the method further comprises:GW记录通过源eNodeB和目标eNodeB同时向UE发送业务数据的开始时间，如果GW在预定时间到时，没有接收到目的eNodeB向源eNodeB转发的小区切换完成信令，则停止通过源eNodeB和目标eNodeB同时向UE发送业务数据。The GW records the start time of simultaneously sending service data to the UE through the source eNodeB and the target eNodeB. If the GW does not receive the cell handover completion signaling forwarded by the target eNodeB to the source eNodeB when the predetermined time is up, the GW stops passing through the source eNodeB and the target eNodeB. At the same time, service data is sent to the UE.13、如权利要求8所述的跨演进节点B的小区切换方法，其特征在于，GW在UE进行小区切换前，获得该UE的RRC上下文的方法为：13. The method for inter-evolved node B cell handover according to claim 8, wherein the method for the GW to obtain the RRC context of the UE before the UE performs cell handover is:源eNodeB检测到UE移动到该eNodeB的边缘小区时，向GW发送该UE的RRC上下文副本；When the source eNodeB detects that the UE moves to the edge cell of the eNodeB, it sends the RRC context copy of the UE to the GW;该方法进一步包括：当源eNodeB或目标eNodeB检测到UE从边缘小区移动到该eNodeB的非边缘小区时，通知GW删除该UE的RRC上下文副本。The method further includes: notifying the GW to delete the RRC context copy of the UE when the source eNodeB or the target eNodeB detects that the UE moves from the edge cell to the non-edge cell of the eNodeB.

Images