CN100551157C - Base station switchover method - Google Patents

Base station switchover method Download PDF

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CN100551157C
CN100551157C CN 200610067492 CN200610067492A CN100551157C CN 100551157 C CN100551157 C CN 100551157C CN 200610067492 CN200610067492 CN 200610067492 CN 200610067492 A CN200610067492 A CN 200610067492A CN 100551157 C CN100551157 C CN 100551157C
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base station
step
handover
access gateway
message
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CN 200610067492
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CN101047966A (en
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健 张
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中兴通讯股份有限公司
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Abstract

本发明公开了一种基站切换方法,包括:在基站的媒体接入控制层设置自动重传请求一级缓存,在接入网关的分组数据汇聚协议层设置自动重传请求二级缓存,在基站的测量模块设置切换准备门限和切换决策门限;当源基站判断用户设备的测量报告到达切换准备门限时,保持两级缓存同步;当测量报告到达切换决策门限时,把二级缓存中的分组数据汇聚协议层协议数据单元发送给目标基站,并在最后一个数据包携带发送完成标志;目标基站接收分组数据汇聚协议层协议数据单元到一级缓存,并处理成媒体接入控制层协议数据单元;目标基站完成接收和相应的处理后,请求接入网关执行基站切换操作。 The present invention discloses a base station handover method, comprising: an automatic repeat request in a cache disposed media access control layer of the base station, a packet data convergence protocol layer disposed on the Access Gateway ARQ secondary cache, the base station measurement module disposed handover preparation threshold and handover decision threshold; when the source base station determines that the user equipment measurement reports arrive handover preparation threshold, holding two cache synchronization; when the measurement report reaches a handover decision threshold, the packet data two cache convergence protocol layer protocol data unit to the target base station, and carries the last data packet transmission completion flag; target base station receives a packet data convergence protocol layer protocol data unit into a buffer, and processed into a media access control layer protocol data unit; after completion of receiving the target base station and the corresponding processing, the base station requests the access gateway performs a switching operation. 本发明能降低源基站的处理负荷,实现了基站无损切换。 The present invention can reduce the processing load of the source base station, the base station implements lossless handover.

Description

一种基站切换方法 A base station handover method

技术领域 FIELD

本发明涉及一种基站切换方法,特别涉及一种第三代移动通信长期演进 The present invention relates to a base station handover method, and particularly relates to a third generation mobile communication long term evolution

系统中通过对ARQ (automatic repeat request ,自动重传请求)的处理完成的基站切换方法。 The base station system processed by ARQ (automatic repeat request, ARQ) switching method.

背景技术 Background technique

第三代移通信长期演进系统中,在用户面使用上层ARQ实体与底层HARQ (Hybrid Automatic Repeat Request ,混合自动重传请求)实体相结合的机制实现可靠传输。 Third generation mobile communication long term evolution system, using the upper layer ARQ entity in the user plane and the underlying HARQ (Hybrid Automatic Repeat Request, hybrid automatic repeat request) entity combining mechanism to achieve reliable transmission. 当ARQ实体位于基站时,在基站切换情况下,目前已知的移动性管理解决方案有基站转发方式和多播方式两类。 When the ARQ entity is located in the base station, the base station in the handover situation, the presently known solutions have a mobility management method and the base station forwards the multicast mode two.

基站转发方式工作原理为:当源基站判断UE (User Equipment ,用户设备)的测量报告到达切换决策门限时,把用户设备上下文和ARQ緩存中的所有PDU (Protocol Data Unit ,协议数据单元)分别用相应的消息转发给目标基站;当目标基站完成接收和相应的处理后,请求接入网关执行基站切换操作。 The base station forwards the embodiment works as follows: When the measurement reports the source base station determines UE (User Equipment, user equipment) reaches a handover decision threshold, all PDU (Protocol Data Unit, PDU) user device context and the ARQ buffer are represented by a corresponding message to the target base station; when the target base station receives and the corresponding processing is completed, the base station requests the access gateway performs a switching operation. 多播方式工作原理为:接入网关一直向UE快速切换集中的所有小区多播用户数据,或者基于UE的请求仅在切换期间向所有候选小区多播用户数据,于是切换前就不需要从源基站向目标基站转发ARQ緩冲区中所有的PDU。 Multicast mode works as follows: the access gateway has fast switching of all cells to the UE centralized multicast user data, user data or multicast request from the UE based on only during the handover to all candidate cells, then before the handover from the source do not need the base station forwards the ARQ buffer in the PDU to the target base station.

但是基站转发方式解决方案的不足是:转发ARQ緩冲区中所有PDU的过程中会产生较长时延,且增加了源基站的处理负荷。 But the lack of base-forward solution are: Forward ARQ PDU in buffer all process will produce a longer delay, and increases the processing load of the source base station. 多播方式的不足是: 切换后判断哪些数据已经发送给UE的机制复杂,且多播过程中占用了额外目标小区资源,从很大程度上降低了系统容量。 Lack of multicast mode is: Switching determine which data has been sent to the UE complex mechanisms, and multicast process takes up additional resources to the target cell, reducing the system capacity to a large extent.

发明内容本发明所解决的技术问题在于提供了一种基站切换方法,以达到在基站切换前从源基站向目标基站仅需转发用户设备上下文,降低源基站的处理负荷,实现了基站无损切换。 SUMMARY OF THE INVENTION The technical problem that the present method provides a base station handover, to achieve forward only when the base station handover from a source base station to a target user device context, reduce the processing load of the source base station, the base station implements lossless handover.

为解决上述技术问题,本发明提供了一种基站切换方法,当用户设备测量报告到达源基站切换门限时,将用户设备上下文和自动重传请求緩存中的协议数据单元转发给目标基站,当目标基站完成处理后,接入网关执行基站 To solve the above problems, the present invention provides a base station handover method, when the user equipment a measurement report to the source base station handover threshold, the user device context and forwarding automatic retransmission request protocol data unit to the target base station in the cache, when the target after the completion of the processing station, the base station performs an access gateway

切换,本方法包括如下步骤: Handover, the method comprising the steps of:

步骤一、在源基站的媒体接入控制层中设置自动重传请求一级緩存、在接入网关的数据汇聚协议层设置自动重传请求二级緩存; A step, provided the source base station medium access control layer in a HARQ buffer, data convergence protocol layer of the access gateway provided automatic repeat request the secondary cache;

步骤二、在所述源基站设置切换准备门限和切换决策门限; Step two, provided in the source base station handover preparation and the handover threshold decision threshold;

步骤三、当所述源基站根据用户设备的测量报告判断到切换准备门限到达时,向所述接入网关发送切换准备通知消息,使所述源基站中的自动重传请求一级緩存与所述接入网关中的自动重传请求二级緩存同步,同步成功后,所述源基站向所述接入网关发送同步成功通知消息,所述源基站向所述接入网关发送周期状态报告,两级自动重传请求緩存保持同步状态; Step three, when the source base station determines to a handover preparation when reaching the threshold according to the measurement report of the user equipment sends a handover preparation message to the access gateway a notification, makes automatic retransmission request to the source base station and the cache said access gateway HARQ two cache synchronization, the synchronization is successful, the source base station transmits the synchronization success notification message to the access gateway, the source base station sends periodic status report to the access gateway, two ARQ buffer in sync;

步骤四、当所述源基站根据所述用户设备测量报告判断到切换决策门限到达时,向所述接入网关发送切换决策通知消息;向所述目标基站发送用户设备上下文消息; Step four, when the source base station determines handover decision threshold to reach the user equipment according to the measurement report, send a handover decision notification message to the access gateway; sending user equipment context information to the target base station;

步骤五、所述接入网关接收到所述切换决策通知消息后,与所述目标基站建立用户面连接; Step five, the access gateway after receiving the handover decision notification message, establishing a user plane connection with the target base station;

步骤六、所述目标基站接收到所述用户设备上下文消息后,进行资源分配与资源预留处理,执行成功后向所述源基站回复所述用户设备上下文确认消息,向所述接入网关发送数据准备通知消息; Step six, the target base station after receiving the context message to the user device, resource allocation and resource reservation processing, after performing a successful reply to the user equipment context acknowledgment message to the source base station transmits to the access gateway data preparation notification message;

步骤七、所述源基站接收到所述用户设备上下文确认消息后,向所述用户设^^发送切换命令; Step seven, the source base station receives the user equipment context acknowledgment message, the user is provided to send a handover command ^^;

步骤八、所述用户设备收到切换命令后,与所述目标基站建立连接流程, Step Eight, the user equipment after receiving the handover command, establishing a connection procedure with the target base station,

连接流程建立成功后,向所述目标基站发送切换确认消息; After a successful connection establishment process, the target base station sends a handover acknowledgment message;

步骤九、所述接入网关接收到数据准备通知消息,把自动重传请求二级緩存中的分組数据汇聚协议层协议数据单元发送给所述目标基站,并将完成 Step 9, the access gateway receives a data ready notification message, the automatic retransmission request is a packet data convergence protocol secondary cache layer protocol data unit transmitted to the target base station, and the complete

消息通知所述目标基站; Message informs the target base station;

步骤十、所述目标基站接收分组数据汇聚协议层协议数据单元到自动重传请求一级緩存,并进行处理,生成媒体接入控制层协议数据单元; Step 10, the target base station receives the packet data convergence protocol layer protocol data unit to an automatic repeat request buffer and processed to generate a media access control layer protocol data unit;

步骤十一、所述目标基站收到所述用户设备切换确认消息,在接收所述接入网关自动重传请求二级緩存的分组数据汇聚协议层协议数据单元完成后,向所述接入网关发送路径切换请求消息; Step 11, the target base station receives the handover confirm message to the user equipment, after receiving the access gateway secondary cache automatic repeat request packet data convergence protocol layer protocol data unit is completed, to the access gateway sending a path switch request message;

步骤十二、所述接入网关收到所述路径切换请求消息后执行路径切换操作。 Step 12, the access gateway receives the path switch request message after execution path switching operation.

本方法步骤三中,所述使所述源基站中的自动重传请求一级緩存与所述接入网关中的自动重传请求二级緩存同步步骤,可以包括如下步骤: This method step 3, so that the automatic retransmission request to the source base station in a secondary cache buffer synchronization procedure automatic retransmission request to the access gateway, may include the steps of:

所述接入网关收到切换准备通知消息后,在自动重传请求二级緩存中储存分组数据汇聚协议层协议数据单元,所储存的分组数据汇聚协议层协议数据单元内容、编号与发送给源基站的分组数据汇聚协议层协议数据单元内 The access gateway receives the handover preparation message notification, automatic retransmission request stored in the secondary cache the packet data convergence protocol layer protocol data unit, data packet stored convergence protocol layer protocol data unit contents, and sent to the source number the base station data packet in the convergence protocol layer protocol data unit

容、编号一致5 Yung, the same number 5

所述源基站中自动重传请求一级緩存从接收到所述接入网关的第一个标记的分组数据汇聚协议层协议数据单元开始,到发送完成原来緩存中的所有媒体接入控制层协议数据单元时,生成每个媒体接入控制层协议数据单元的分组数据汇聚协议层服务数据单元,在所述接入网关自动重传请求二级緩存中都有对应的分组数据汇聚协议层协议数据单元。 The source base station automatically retransmit all the original media access control layer protocol cache request from a cache access gateway receives the first marker packet data convergence protocol layer protocol data unit starts, to the completion of the transmission data units, each generating a medium access control layer protocol packet data convergence protocol layer service data units of the data unit, automatic repeat request two cache has a corresponding packet data convergence protocol layer protocol data in the access gateway unit.

使用本发明,能在基站切换前从源基站向目标基站仅需转发用户设备上下文,降低了源基站的处理负荷,并且实现了无损切换。 The present invention can be forwarded only when the base station handover from a source base station to a target user device context, reduces the processing load of the source base station, and a lossless handover.

附图说明 BRIEF DESCRIPTION

图1是本发明实施例所述ARQ结构示意框图; 1 is the embodiment of the present invention ARQ block diagram illustrating a schematic structure;

图2是本发明实施例中所述基站切换的流程示意图。 FIG 2 is a flow schematic diagram of the embodiment of the present invention, the base station handover.

具体实施方式在本发明实施例中,首先在基站中的MAC (Medium Access Control , 媒体接入控制层)i殳置ARQ实体和ARQ —级緩存,并在接入网关中的PDCP (Packet Data Convergence Protocol ,分组数据汇聚协议层)设置ARQ 二级緩存。 DETAILED DESCRIPTION In embodiments of the invention, the first MAC (Medium Access Control, media access control layer) and I Shu opposed ARQ entity in the base station ARQ - level cache, and PDCP (Packet Data Convergence in the access gateway protocol, packet data convergence protocol layer) disposed ARQ L2 cache. ARQ二级緩存的内容为经过头压缩后的IP包,即PDCPPDU。 SUMMARY ARQ after the secondary cache for IP packet header compression, i.e. PDCPPDU. ARQ 一级緩存中的内容为MACPDU, MACPDU有两种数据组成方式:1)、原始的PDCP服务数据单元SDU附加或不附加MAC头信息,这种情况MAC PDU与PDCPPDU为l对l关系;2)、对PDCP SDU按照固定长度进行串接/分段后附加或不附加MAC头信息,这种情况MAC PDU与PDCP PDU 为1对多、多对l或多对多关系。 SUMMARY ARQ is a cache MACPDU, MACPDU data composed of two ways: 1), the original PDCP service data units SDU MAC header with or without additional information, MAC PDU with the case of l to l PDCPPDU relation; 2 ), to follow a fixed length PDCP SDU concatenation / or without MAC header information segment, this MAC PDU and PDCP PDU is more than one pair, or pairs of l-many relationship. ARQ二级緩存的容量等于或略大于ARQ 一级緩存,以保证其能够包含ARQ —级緩存中所有原始用户数据信息。 ARQ secondary cache capacity is equal to or slightly larger than the cache ARQ, ARQ can be included to ensure that - all the original user data level cache information. 图l是实施例中ARQ结构示意框图,如图所示,其结构主要为两级上层ARQ緩存加底层HARQ緩存的结构,其中:接入网关101中舍有PDCP层1011以及其中的ARQ二级緩存。 Figure l is a schematic block diagram of the structure of ARQ embodiment, as shown, the structure is mainly two upper layer ARQ buffer HARQ buffer plus the underlying structure, wherein: the access gateway 101 homes 1011 with a PDCP layer and wherein the two ARQ cache. 源基站102中含有MAC层1021以及其中的ARQ —级緩存、HARQ緩存、ARQ实体、HARQ实体。 The source base station 102 contained in the MAC layer 1021 and wherein the ARQ - level cache, HARQ buffer, ARQ entity, HARQ entity. ARQ—级緩存和HARQ緩存中分别有一部分静态分配或动态分配的存储空间为各自的重传緩冲区10211,存放需要重传的PDU或PDU指针,其内容可能为空。 ARQ- level cache and part HARQ buffer allocated dynamically or statically allocated memory space for each respective retransmission buffer 10211, deposited retransmitted PDU or PDU pointer, the contents of which may be empty. 目标基站103中也一样舍有MAC层1031以及其中的ARQ —级緩存、 HARQ緩存、ARQ实体、HARQ实体。 The target base station 103 in the same house with a MAC layer 1031 and wherein the ARQ - level cache, HARQ buffer, ARQ entity, HARQ entity. ARQ—tt存和HARQ緩存中同样分别有一部分静态分配或动态分配的存储空间为各自的重传緩冲区10311, 存放需要重传的PDU或PDU指针,其内容可能为空。 HARQ and ARQ-tt buffer memory also has a portion or static allocation are dynamically allocated storage space for each retransmission buffer 10311, deposited retransmitted PDU or PDU pointer, the contents of which may be empty. ARQ —级緩存用于正常情况下即非切换时的重传处理,这种情况不需要ARQ 二级緩存参与。 ARQ - level cache that is normally used for non-handover process when the retransmission, ARQ this case no participation in the secondary cache. ARQ 二级緩存仅用于基站切换前緩存从接入网关发往源基站的PDCPPDU。 ARQ secondary cache for buffering from the access gateway is only sent to the source base station before handover PDCPPDU. 在设置好一级緩存与二级緩存后,在源基站的测量模块中设置切换准备门限和切换决策门限。 After setting the cache and secondary cache, the measurement module provided in the source base station handover preparation and the handover threshold decision thresholds. 图2是实施例中基站切换的流程示意图,如图所示,在设置好一级、 二级援存,以及切换准备门限、切换决策门限后,基站切换的实施流程为:步骤201、 UE向源基站发送测量报告。 UE proceeds to step 201: FIG. 2 is a flow diagram of a base station handover embodiment as shown, after one set, two memory aid, and the threshold handover preparation, handover decision threshold, the base station handover process is implemented The source base station sends a measurement report. 步骤202、源基站根据测量报告判断切换准备门限到达。 Step 202, the source base station handover preparation door according to the measurement report decision limit reached. 步骤2(B、源基站向接入网关发送切换准备通知消息。步骤204、接入网关开始在ARQ二级緩存中緩存PDCPPDU。步骤205、源基站向接入网关发送ARQ两级緩存同步成功消息。步骤206、源基站向接入网关发送周期状态报告,两级ARQ保持同步状态。其中,两级緩存的同步过程是:当源基站判断UE的测量报告中切换准备门限到达时,向接入网关发送切换准备通知消息;接入网关收到该消息后开始在ARQ二级緩存中緩存PDCPPDU,所緩存的PDCPPDU内容、编号与发送给源基站的PDCPPDU内容、编号一致;ARQ—级緩存从接收到第一个标记的PDCP PDU开始,到发送完成其原来緩存中的所有MAC PDU 时,生成的每个MAC PDU的PDCP SDU (Service Data Unit ,服务数据单元)在ARQ二级緩存中将都有对应的PDCP PDU,这种状态我们也称为ARQ 两,存同步,同步以后源基站向接入网关发送同步成功通知消息;当ARQ 一级緩 Step 2 (B, source base station sends a notification message to prepare handover to the access gateway in step 204, the access gateway in the ARQ start PDCPPDU cache in the secondary cache step 205, the source base station transmits the ARQ buffer two synchronization success message to the access gateway in step 206, the source base station transmits the access gateway to the periodic status report, ARQ two synchronized state wherein two cache synchronization process is: when the UE measurement reports the source base station determines the handover preparation reaches the threshold, the access to gateway sends a handover preparation message notification; the access gateway after receiving the message in the ARQ start buffered PDCP PDUs secondary cache, the cached content PDCP PDUs, PDCP PDUs and transmits the content ID to the source base station, the same number; ARQ-level cache from receiving to the first PDCP PDU of the start marker, the transmission is complete when all of its original MAC PDU cache, each of the MAC PDU generated PDCP SDU (service data unit, a service data unit) in the secondary cache are in the ARQ corresponding PDCP PDU, this state is also referred to our two ARQ, deposit, the synchronization after successful synchronization source base station sends a notification message to the access gateway; when an ARQ buffer 中的MACPDU发送成功从緩存中删除后,向接入网关发送周期状态报告消息,令ARQ—级緩存删除相关的PDCPPDU;步骤207、 UE向源基站发送测量报告。步骤208、源基站判断切换决策门限到达,执行切换决策。步骤209、源基站向接入网关发送切换决策通知消息。步骤210、源基站向目标基站发送用户设备上下文。其中,用户设备上下文包括:UE标识、UE地址、UE能力、小区信息、 源基站信息、目标基站信息、QoS信息、无线承载信息等; 步骤211、接入网关与目标基站建立用户面连接。 步骤212、目标基站执行资源分配与资源预留处理。 步骤213、目标基站向源基站发送用户设备上下文确认消息。 步骤214、目标基站向接入网关发送数据准备通知。步骤215、源基站向UE发送切换命令。步骤216、接入网关把ARQ 二级緩存中的PDCP PDU发送给目标基站。 步骤217、 UE与目标基站小 After the MACPDU sent successfully removed from the cache, the access gateway to report a status message transmission period, so ARQ- level cache delete related PDCPPDU;. Step 207, UE transmits a measurement report to the source base station in step 208, the source base station determines handover decision threshold arrival, performs handover decision step 209, the source base station sends a handover decision notification message to the access gateway in step 210, the source base station transmits the user device context to the target base station wherein the user equipment context comprises:... UE identifier, the UE address, the UE capability step 211, the target access gateway and the base station establishes user plane connection step 212, the target base station performs resource allocation and resource reservation processing of step 213; cell information, information source base station, the target base station information, QoS information, radio bearer information and the like. , the target base station sends the source base station to the user equipment context acknowledgment message step 214, the target base station transmits data to the access gateway prepares a notification step 215, the source base station transmits a handover command to the UE. step 216, the access gateway ARQ secondary cache the PDCP PDU is sent to the target base station in step 217, UE and the target base station small 同步,RB (Radio Bearer ,无线承载电路)重配置。步骤218、 UE向目标基站发送切换确认消息。此时,在连接建立成功后,UE向目标基站发送切换确认消息后,接入网关接收到数据准备通知消息,把ARQ二级緩存中的PDCPPDU发送给目标基站,并在最后一个数据包携带发送完成标志,或者发送完成后再以单独的消息通知目标基站;目标基站接收PDCP PDU到ARQ —级緩存并进行相应的处理后,生成MACPDU;目标基站在收到UE切换确认消息,且接收接入网关ARQ 二级緩存PDCPPDU完成后,在进行下一步的向接入网关发送路径切换请求消息。 Synchronization, RB (Radio Bearer, radio bearer) reconfiguration step 218, UE sends a handover confirm message to the target base station. In this case, after the connection is established, the UE transmits to the target base station after the handover confirm message, the gateway receives the access prepares a notification message data, transmits ARQ PDCPPDU two cache to the target base station, and carrying the transmission completion flag in the last packet, or after the transmission is completed in a separate message notifies the target base station; target base station receives the PDCP PDU to the ARQ - after level cache and the corresponding processing to generate a MAC PDU; UE handover target base station receiving the acknowledgment message, and after receiving the access gateway ARQ secondary cache PDCPPDU completed, proceeding to the transmission path switching request message to the access gateway. 步骤219、目标基站向接入网关发送路径切换请求消息。 Step 219, the access gateway to the handover target base station sends a path request message. 步骤220、接入网关执行路径切换操作,把目标地址修改为原目标基站。 Step 220, the access gateway performs path switching operation, the original destination address to modify the target base station. 步骤221 、接入网关执行与源基站之间的用户面资源释放过程。 Step 221, the user plane resource release process performed between an access gateway and the source base station. 本发明提供了基站切换时一种新的移动性管理解决方案,使得在切换前从源基站向目标基站之间仅需转发用户设备上下文,从而降低了源基站的处理负荷,同时还实现了基站的无损切换。 The present invention provides a new base station handover mobility management solution, such that only forwarding before handover from a source base station to a user equipment context between the target base station, thereby reducing the processing load of the source base station, the base station while still achieving a lossless switching.

Claims (10)

1、一种基站切换方法,当用户设备测量报告到达源基站切换门限时,将用户设备上下文和自动重传请求缓存中的协议数据单元转发给目标基站,当目标基站完成处理后,接入网关执行基站切换,其特征在于,包括如下步骤: 步骤一、在源基站和目标基站的媒体接入控制层中设置自动重传请求一级缓存、在接入网关的数据汇聚协议层设置自动重传请求二级缓存; 步骤二、在所述源基站设置切换准备门限和切换决策门限; 步骤三、当所述源基站根据用户设备的测量报告判断到切换准备门限到达时,向所述接入网关发送切换准备通知消息,使所述源基站中的自动重传请求一级缓存与所述接入网关中的自动重传请求二级缓存同步,同步成功后,所述源基站向所述接入网关发送同步成功通知消息,所述源基站向所述接入网关发送周期状态报告,两级自动重 A base station handover method, when the user equipment a measurement report to the source base station handover threshold, the user device context and forwarding automatic retransmission request protocol data unit to the target base station in the cache, after the process is completed when the target base station, an access gateway the base station performing handover, characterized by comprising the following steps: step one, the media access control layer provided the source and target base stations in a HARQ buffer, data convergence protocol layer of the access gateway provided automatic retransmission request the secondary cache; two step, provided in the source base station handover preparation and the handover threshold decision threshold; step three, when the source base station determines handover preparation to reach the threshold according to a user equipment a measurement report to the access gateway a notification message transmitting handover preparation, so that automatic retransmission request to the source base station in a buffer and the automatic retransmission request access gateway secondary cache synchronization, the synchronization is successful, the source base station to the access gateway transmits the synchronization success notification message, the source base station sends periodic status report to the access gateway, two automatic repeat 传请求缓存保持同步状态; 步骤四、当所述源基站根据所述用户设备测量报告判断到切换决策门限到达时,向所述接入网关发送切换决策通知消息;向所述目标基站发送用户设备上下文消息; 步骤五、所述接入网关接收到所述切换决策通知消息后,与所述目标基站建立用户面连接; 步骤六、所述目标基站接收到所述用户设备上下文消息后,进行资源分配与资源预留处理,执行成功后向所述源基站回复所述用户设备上下文确认消息,向所述接入网关发送数据准备通知消息; 步骤七、所述源基站接收到所述用户设备上下文确认消息后,向所述用户设备发送切换命令; 步骤八、所述用户设备收到切换命令后,与所述目标基站建立连接流程,连接流程建立成功后,向所述目标基站发送切换确认消息; 步骤九、所述接入网关接收到数据准备通知消息,把 Request buffer in sync; step four, when the source base station to the user equipment according to the measurement report is determined to reach a threshold switching decision, to the access gateway transmits a handover decision notification message; transmitting user device to the target base station context message; step five, the access gateway decision after receiving the handover notification message, establishing a user plane connection with the target base station; step six, the target base station after receiving the context message to the user equipment, resources allocation and resource reservation process, after performing a successful reply to the source base station to the user equipment context acknowledgment message, the transmission data preparation notification message to the access gateway; step seven, the source base station receives the user equipment context after the confirmation message, sent by the user equipment to the switching command; eight steps, the user equipment receives the handover command, establishing a connection procedure with the target base station after a successful connection establishment process, acknowledgment message to the handover target base station ; step 9, the access gateway receives the notification message data preparation, the 动重传请求二级缓存中的分组数据汇聚协议层协议数据单元发送给所述目标基站,并将完成消息通知所述目标基站; 步骤十、所述目标基站接收分组数据汇聚协议层协议数据单元到目标基站的自动重传请求一级缓存,并进行处理,生成媒体接入控制层协议数据单元; 步骤十一、所述目标基站收到所述用户设备切换确认消息,在接收所述接入网关自动重传请求二级缓存的分组数据汇聚协议层协议数据单元完成后,向所述接入网关发送路径切换请求消息; 步骤十二、所述接入网关收到所述路径切换请求消息后执行路径切换操作。 Moving request retransmission packet data in the secondary cache data convergence protocol layer protocol unit transmits to the target base station and the target base station notifies the completion message; Data Step 10, the target base station receives the packet data convergence protocol layer protocol target base station to the ARQ level cache, and performs processing, generates a media access control layer protocol data unit; step 11, the target base station receives the handover confirm message to the user equipment, receiving in the access after step 12, the access gateway receives the path switch request message; gateway automatic retransmission request after the secondary cache packet data convergence protocol layer protocol data unit is completed, to the access gateway sends a path switch request message performing path switching operation.
2、 如权利要求1所述的方法,其特征在于,步骤二中,所述设置切换准备门限和切换决策门限,是在所述源基站的测量模块中设置的。 2. The method as claimed in claim 1, wherein, in step two, the setting handover preparation and the handover threshold decision threshold, the measurement module is disposed in the source base station.
3、 如权利要求1所述的方法,其特征在于,步骤三中,所述使所述源基站中的自动重传请求一级緩存与所述接入网关中的自动重传请求二级緩存同步步骤,包括如下步骤:所述接入网关收到切换准备通知消息后,在自动重传请求二级緩存中储存分组数据汇聚协议层协议数据单元,所储存的分组数据汇聚协议层协议数据单元内容、编号与发送给源基站的分组数据汇聚协议层协议数据单元内容、编号一致;所述源基站中自动重传请求一级緩存从接收到所述接入网关的第一个标记的分组数据汇聚协议层协议数据单元开始,到发送完成原来緩存中的所有媒体接入控制层协议数据单元时,生成每个媒体接入控制层协议数据单元的分组数据汇聚协议层服务数据单元,在所述接入网关自动重传请求二级緩存中都有对应的分组数据汇聚协议层协议数据单元。 3. The method of claim 1, wherein, in step three, so that the automatic retransmission request to the source base station in a buffer and the automatic retransmission request access gateway secondary cache synchronizing step comprising the steps of: the access gateway after receiving the handover preparation message notification, automatic retransmission request stored in the secondary cache the packet data convergence protocol layer protocol data unit, data packet stored convergence protocol layer protocol data unit content, data packets sent to the source base station and the number of the convergence protocol layer protocol data unit content, consistent number; the source base station automatically requests a retransmission data packet from the first cache tag of receiving the access gateway the data convergence protocol layer protocol unit to start, when the completion of transmission of all media access control layer protocol data unit of the original buffer, generating a packet data convergence protocol layer service data units per medium access control layer protocol data unit, in the access gateway ARQ packet data convergence protocol layer protocol data unit has a corresponding second-level cache.
4、 如权利要求1所述的方法,其特征在于,所述步骤三中进一步包括如下步骤:同步以后所述源基站向所述接入网关发送同步成功通知消息后;当所述源基站的自动重传请求一级緩存中的媒体接入控制层协议数据单元发送成功,并从緩存中删除后,向所述接入网关发送周期状态报告消息,令所述源基站自动重传请求一级緩存删除相关的分组数据汇聚协议层协议数据单元。 4. The method of claim 1, wherein said step further comprises the step of three: After successful synchronization after synchronization the source base station transmits the notification message to the access gateway; when the source base station automatic retransmission media access control layer protocol data unit requesting a cache successfully sent, and after removed from the cache, the report message to the access gateway transmission cycle state, so that the source base station an automatic repeat request cache deletion associated packet data convergence protocol layer protocol data unit.
5、 如权利要求1所述的方法,其特征在于,步骤四中,所述发送用户设备上下文消息,是发送用户设备标识、用户设备地址、用户设备能力、小区信息、源基站信息、目标基站信息、服务质量信息、无线承载信息。 5. The method of claim 1, wherein, in step four, the sending user equipment context message, sending a user equipment identifier, address of the user equipment, the user equipment capability, the cell information, information source base station, the target base station information, quality of service information and radio bearer information.
6、 如权利要求1所述的方法,其特征在于,步骤八中,所述用户设备与所述目标基站建立连接流程,是与所述目标基站建立小区同步、无线承载电路重配置流程。 6. The method as claimed in claim 1, wherein, in step eight, the user device establishes a connection procedure with the target base station to establish synchronization with the target cell base station, a radio bearer reconfiguration process.
7、 如权利要求1所述的方法,其特征在于,步骤九中,所述将完成消息通知所述目标基站,是通过在最后一个数据包携带发送完成标志,来将完成消息通知所述目标基站的。 7. The method as claimed in claim 1, wherein, in Step 9, the completion message notifies the target base station, the transmission completion flag is carried by the last data packet, the completion message to notify the target base station.
8、 如权利要求1所述的方法,其特征在于,步骤九中,所述将完成消息通知所述目标基站,是通过在发送完成后以单独的消息通知所述目标基站,来将完成消息通知所述目标基站的。 8. A method as claimed in claim 1, wherein, in Step 9, the completion message notifies the target base station, by a separate message notifies the target base station, to be completed after completion of sending a message notifying the target base station.
9、 如权利要求1所述的方法,其特征在于,步骤十二中,所述路径切换,燥作,是通过将目标地址修改为所述目标基站地址完成切换的。 9. The method according to claim 1, wherein, in Step 12, the path switching, as a dry, the destination address is modified by switching to the target base station to complete the address.
10、 如权利要求l所述的方法,其特征在于,所述步骤十二中进一步包括如下步骤:切换完成后,所述接入网关将与所述源基站之间的用户面资源释放。 10. The method according to claim l, wherein said step of twelve further comprising the step of: after the handover is completed, the access gateway user plane release resources between the source base station.
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