CN100433717C - Data transmission method in switching process - Google Patents

Data transmission method in switching process Download PDF

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CN100433717C
CN100433717C CN 200510109285 CN200510109285A CN100433717C CN 100433717 C CN100433717 C CN 100433717C CN 200510109285 CN200510109285 CN 200510109285 CN 200510109285 A CN200510109285 A CN 200510109285A CN 100433717 C CN100433717 C CN 100433717C
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CN1801776A (en
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吴建军
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华为技术有限公司
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Abstract

本发明涉及网络通信技术领域中一种切换过程中数据传输的方法。 The present invention relates to network communication technology field of one data transmission during handover. 在移动用户站MSS发生切换时,将该MSS切换前的源基站BS中应当发给该MSS,但未发送完的下行数据包信息回传到源接入服务网络网关ASN-GW,再由源ASN-GW将所述数据包信息发送到MSS。 When the mobile subscriber station MSS handover occurs, the source base station BS before the handover of the MSS should be sent to the MSS, but no downlink data packet information sent back to the End of the source access service network gateway ASN-GW, then the source ASN-GW transmits the packet information to the MSS. 本发明实现了发生切换时,将源BS未发送完的数据包信息回传到源ASN-GW的过程,达到了无线接入网络的低丢包率、低时延。 The present invention achieves the handover occurs, the packet information source BS is not transmitted to the process after sending back the source ASN-GW, to achieve the low loss rate of the radio access network, low latency.

Description

一种切换过程中数据传输的方法 A method of data transmission during handover

技术领域 FIELD

本发明涉及网络通信技术领域,尤其涉及一种切换过程中数据传输的方法。 The present invention relates to network communication technology, and particularly relates to a method of data transmission during handover.

背景技术 Background technique

随着因特网业务的蓬勃发展和无线网络的广泛应用,移动用户的数目迅 As the number of widely used wireless network to flourish and Internet services, mobile users fast

猛增加,随之,用户的需求也迅速提高,这无疑要求无线技术,如GPRS (General Packet Radio Service通用分組无线业务)、3G、 WiMAX和B3G (Beyond 3G;后3G)等无线技术,能够支持大容量,大数据量和不同服务质量要求的多种业务。 Meng increase, along with the user's demand is rapidly increasing, which undoubtedly requires wireless technologies such as GPRS (General Packet Radio Service General Packet Radio Service), 3G, WiMAX and B3G (Beyond 3G; after 3G) wireless technology to support large-capacity, high data volumes and quality of service requirements of a variety of different business.

无线接入技术作为无线用户与现有有线网络或者其他业务网络之间的桥梁,主要完成提供网络和移动用户之间的分组业务转发或路由的功能。 The radio access technology as a bridge between the wireless user and the existing wired network or other service networks, mainly to complete to provide the packet service between a network and a mobile user forwarding or routing functions.

下面以如图1所示的WiMAX网络架构体系为例,说明采用无线接入技术' 的WiM AX无线接入系统中各个网元的功能: Below WiMAX system network architecture shown in Figure 1 as an example, a functional WiM AX wireless access system adopts a radio access technology 'in the respective network element:

在图1中,所述WiMAX无线接入系统包括MSS ( Mobile Subscribe Station移动用户站)、ASN (Access Service Network;接入服务网络)和CSN ( Connectivity Service Network;连接服务网络)。 In Figure 1, the WiMAX wireless access system comprises a MSS (Mobile Subscribe Station mobile subscriber station), ASN (Access Service Network; access service network) and CSN (Connectivity Service Network; Connectivity Service Network).

其中,所述MSS为移动用户终端设备,用户使用该设备接入WiMAX网络。 Wherein, the MSS is a mobile user terminal equipment, the user equipment access WiMAX network.

其中,所述ASN包括BS (Base Station;基站)和ASN-GW (Access Service Network GateWay ;接入服务网络网关)等,用于为WiMAX终端设提供无线接入服务的网络功能集合。 Wherein, the ASN includes a BS (Base Station; base station) and ASN-GW (Access Service Network GateWay; Access Service Network Gateway) or the like, for the WiMAX terminal arranged to provide wireless access network function collection. 如,基于所述BS提供BS和MSS的连接、无线资源管理、测量与功率控制、空口数据的压缩与加密等功能;基于所述ASN-GW,为MSS认证、授权和计费功能提供proxy功能、支持NSP的网络发现和选择、为MSS提供L3信息的Relay功能(如IP地址分配)、无线 E.g., based on the BS and the MSS BS provides the connection, radio resource management, power control and measurement, the air interface encryption and data compression functions; based on the ASN-GW, providing proxy functionality for MSS authentication, authorization and accounting support the NSP network discovery and selection, the MSS provides information L3 Relay function (such as IP address assignment), the radio

资源管理等功能。 Resource management.

其中,所述CSN用于为WiMAX终提供IP连接服务。 Wherein, the CSN is used to provide IP connectivity services to WiMAX end. 如,为MSS分配IP 地址、提供lntemet接入、提供AAA proxy或者server、提供基于用户的授4又控制、提供ASN到CSN的隧道,相当于移动IP技术中的HA (家乡代理)、提供WiMAX用户的计费以及运营商之间的结算、漫游情况下CSN之间的隧道、 不同ASN之间的切换,以及各种WiMAX服务(如基于位置的业务、多媒体多播和广播业务、IP多媒体子系统业务)等。 Such as, the MSS is allocated an IP address, lntemet provide access, or provide a AAA proxy server, a user-based control and timing 4, ASN to the CSN tunnel provided, corresponding to the Mobile IP HA (home agent) to provide WiMAX between the user accounting and settlement operators, the tunnel between the CSN roaming scenario, the ASN switching between different, and various WiMAX services (e.g., location-based services, multimedia multicast and broadcast service, IP multimedia sub systems business) and so on.

从数据面来看,下行的MSS的分组业务数据报从CSN的HA通过HA与ASN中的ASN-GW之间的R3接口,传送到ASN中,并由ASN-GW经过ASN内部ASN-GW与已S之间的R6接口和BS与MSS之间的R1接口将MSS的数据发送到MSS上。 From the data perspective, the MSS downlink packet service data packet from the HA of the CSN via an R3 interface between the HA and the ASN ASN-GW, sent to the ASN, the ASN-GW through by internal ASN ASN-GW and R1 interface between the MSS and the R6 interface between the BS and the MSS has to transmit S data to the MSS.

从图1可以看出,随着用户的移动,用户与接入网络之间的接入设备BS,与该用户相关的接入网络和业务网络CSN之间的接入设备ASN-GW都有可能发生变化,也就是发生切换,在移动用户发生切换的过程中,对于那些已经发送到原来的ASN-GW的下行业务,如何正确地通过新的BS发送到移动用户一直是一个比较重要的问题。 As can be seen from Figure 1, the access device BS as the user moves between the user and the access network, the access device between the ASN-GW and an access network associated with the service network CSN of a user are likely changes, that is, switching in the process of mobile user switching occurs in, for those who have been sent to the original ASN-GW downstream business, how to properly sent to mobile users through the new BS has always been a more important problem occurs. 如果全部丟弃这些分组数据报等待上层的重发机制保证,这些重发机制必须在端到端的层面上,也就是说需要移动用户和他的对端用户的参与才能实现,这会导致比较高的丟包率和过长的时延。 If all of the discarded datagram packet retransmission mechanism to ensure that the upper wait for these retransmission mechanism must be on the end of the level, which means that users need to move and his participation in the end user can be achieved, which can lead to higher the long delay and packet loss rate. 而很多分组业务的性能指标中,低丢包率和低时延是比较重要的指标。 The performance of a lot of packet traffic, the low latency and low packet loss rate are more important indicators.

因此,需要提供一种方法可以将已经发送到原来的ASN-GW的下行业务通过新的已S成功发送到移动用户。 Thus, a need to provide a way which has been sent to the original ASN-GW downlink traffic to the mobile user via the new S has been successful.

5发明内容 5 SUMMARY OF THE INVENTION

鉴于上述现有技术所存在的问题,本发明的目的在于提供一种切换过程 In view of the above-described problems of the prior art, an object of the present invention is to provide a handover procedure

中数据传输的方法,将源BS中没有发送完的数据回传到源ASN-GW中緩存, 再将其发送到目标BS,实现了无损迁移。 A method of data transmission, the source data is not finished sending the BS back to the source ASN-GW in the cache, and then transmits it to the target BS, a lossless migration.

本发明的目的是通过以下技术方案实现的: Object of the present invention is achieved by the following technical solution:

一种切换过程中数据传输的方法,在移动用户站MSS发生切换时,将该MSS切换前的源基站BS中应当发给该MSS ,但未发送完的下行数据包回传到源接入服务网络网关ASN-GW緩存,再由源ASN-GW将所述下行数据包通过新的BS发送到MSS。 A method of data transmission during the handover, the mobile subscriber station MSS when the handover occurs, the source base station BS before the handover of the MSS should be sent to the MSS, but sending the downlink data packet back to the source access service network gateway ASN-GW buffer, then the source ASN-GW transmits the downlink data packet to the MSS through the new BS.

所述回传方法包括: The return method comprising:

利用新建的数据链路向源ASN-GW回传源BS中未发送完的下行数据包。 Source to source ASN-GW return the BS downlink data packet transmission is not finished by the new data link. 所述方法具体包括: The method comprises:

A、 MSS从空口发送切换指示消息给源BS,源BS通知到源ASN-GW, 源ASN-G W启动緩存机制及数据回传机制; A, MSS transmits a handover indication message from the air interface to the source BS, the BS informs the source to the source ASN-GW, the source ASN-G W and the data caching mechanism to start the return mechanism;

B、 源ASN-GW建立到源BS的新的数据链路; B, the source ASN-GW to establish a new data link of the source BS;

C 、源BS利用新建的数据链路将未发送完的下行数据包回传到源ASN-GW。 C, the source BS by using the new data link is not finished sending downlink data packet back to the source ASN-GW.

所述步骤B具体包括: Said step B comprises:

B1、源ASN-GW发送承载有数据链路消息、服务质量要求、找回请求和/或对应的MSS标识的数据链路建立请求消息给源BS; B1, the source ASN-GW sends the bearer data link message, quality of service requirements, retrieve request and / or corresponding identifier MSS data link establishment request message to the BS source;

B2、源BS根据所述消息中承载的内容建立新的数据链路,并发送数据链路建立响应消息给源ASN-GW; B2, the source BS to establish a new link according to the data content carried in the message, and sends the data link setup response message to the source ASN-GW;

B3、源ASN-GW接收到所述响应消息后,发送数据链路应答消息给源BS。 B3, the source ASN-GW, after receiving the response message, transmits a data link acknowledgment message to the source BS.

所述回传方法包4舌: The return packet method tongue 4:

利用已有的数据链路回传源BS中未发送完的下行数据包。 Using the existing data link source backhaul downlink data packet transmission is not finished the BS. 所述回传方法具体包括: The return method comprises:

D、 MSS从空口发送切换指示消息给源BS,源BS通知到源ASN-GW, 源ASN-GW启动緩存机制及数据回传机制; D, MSS transmits a handover indication message from the air interface to the source BS, the BS informs the source ASN-GW to the source, the source ASN-GW to start the data caching mechanism and return mechanism;

E、 源ASN-GW发送承栽有MSS ID的数据找回请求给源BS; E, the source ASN-GW transmits the data bearing planted MSS ID of the request back to the source of the BS;

F、 源BS利用已有的数据链路将未发送完的下行数据包回传到源ASN-GW。 F, the source BS using the existing data link incompletely transmitted downlink data packet back to the source ASN-GW.

所述步骤F包括: Said step F comprises:

源ASN-GW根据接收到的数据包的IP头作为回传标识区分回传数据与MSS的上行数据。 The source ASN-GW header of the received IP packet as the return identifier distinguishing uplink backhaul data with the MSS.

所述回传方法包4舌: The return packet method tongue 4:

通过数据回传管理信令实现数据包的回传。 Data management through backhaul signaling to achieve the return of the packet. 所述回传方法具体包括: The return method comprises:

G、 MSS从空口发送切换指示消息给源BS,源BS通知到源ASN-GW, 源ASN-GW启动緩存机制及数据回传机制; G, MSS transmits a handover indication message from the air interface to the source BS, the BS informs the source ASN-GW to the source, the source ASN-GW to start the data caching mechanism and return mechanism;

H、 源ASN-GW发送承载有MSS ID的数据找回请求给源BS; H, carries a source ASN-GW transmits the data request back to the MSS ID of the BS source;

I、 源BS将未发送完的下行数据包封装后打包到数据找回响应消息中回传到源ASN-GW。 I, the source BS transmit the incompletely encapsulating the downlink data packet to retrieve the message data package back to the source ASN-GW in response.

由上述本发明提供的技术方案可以看出,本发明实现了发生切换时,将源BS未发送完的数据包回传到源ASN-GW的过程,达到了无线接入网络的低丢包率、低时延。 Provided by the technical solution of the present invention it can be seen that the invention achieves the handover process occurs, the source BS incompletely transmitted data packet back to the source ASN-GW, to achieve the low loss rate of the radio access network and low latency. 附图说明 BRIEF DESCRIPTION

图1为现有技术WiMAX网络架构体系示意图; 图2为本发明所述方法实施例一操作流程图; 图3为本发明所述方法实施例二操作流程图; 图4为本发明所述方法实施例三操作流程图。 1 is a schematic prior art WiMAX network architecture system; FIG. 2 embodiment of the present invention is an operation flowchart of a method embodiment; FIG. 3 is an operational flowchart of the two embodiment method; 4 of the present invention the method of FIG. operational flowchart three cases of embodiment.

具体实施方式 Detailed ways

本发明的核心思想是提供一种在发生切换的情况下,将已经发送到原来的ASN-GW的下行业务通过新的BS成功发送到移动用户的方法,实现了无损迁移,最终达到了无线接入网络的低丢包率、低时延。 The core idea of ​​the invention is to provide a handover occurs in a case where the original has been sent to the method of the ASN-GW downlink traffic successfully transmitted to the mobile subscriber by the new the BS, a lossless migration eventually reaches the radio access the network of low packet loss rate, low latency.

本发明提供一种切换过程中数据传输的方法,实现将源BS中没有发送完的数据包信息回传到源ASN-GW中緩存,再将其发送到目标BS,本发明实现数据回传的方法包括如下三种: The present invention provides a process of switching the data transmission method of the packet information to achieve source BS is not finished sending back to the source ASN-GW in the cache, and then transmits it to the target BS, the present invention achieves a data backhaul The method comprises the following three:

第一种:通过新建ASN-GW和BS的上行数据业务链路实现数据回传的方 First: for data transmitted back side through the new ASN-GW and BS uplink data service links

法; law;

第二种:利用原有的ASN-GW和BS的上行数据业务链路实现数据回传的方法; The second: using the original ASN-GW and BS uplink data return service link implemented method for data;

第三种:通过数据回传管理信令实现数据回传的方法。 Third: The method for data management signaling data backhaul backhaul achieved.

本发明所述的未发送完的下行数据包信息包括:未发送完的下行数据包 Downlink data packet transmitted information is not finished according to the present invention comprises: not sending the downlink data packet

本身或者可以用来描述未发送完的下行数据包特征的参数,如数据包的序列 Itself or may be used to describe the features of a downlink data packet transmitted incompletely parameters, such as the packet sequence

号、数据包头的参数。 No, the packet header parameters.

下面分别对三种方法的实施过程作详细说明: The following are three methods of implementation described in detail:

利用第一种方法,即新建ASN-GW和BS的上行数据业务链路实现数据回传的方法,实现数据回传的搡作流程如图2所示,参照图2可知,该方法具体 With the first method, i.e., a new uplink traffic data-link the ASN-GW and BS implemented method for data return, data backhaul shoving workflow shown in Figure 2, can be seen with reference to FIG. 2, the method specifically

包括如下步骤: Comprising the steps of:

步骤10: MSS从空口发送切换指示消息给源BS,源BS通知到源ASN-GW,緩存下行数据包信息,启动回传机制; Step 10: MSS transmits a handover indication message from the air interface to the source BS, the BS informs the source to the source ASN-GW, buffers the downlink data packet information, start the return mechanism;

在MSS从源BS移动到目标BS所覆盖的范围,或者在源BS和目标BS同时所覆盖的范围内,由MSS或者网络侧触发了切换的时候,MSS从空口发送切换指示消息给源BS,表明发生了切换及切换后的连接状况,源ASN-GW通过对于业务的QoS要求和/或用户的等级,决定是否需要采用緩存机制支持分组业务的无损切换。 Moving the MSS from a source BS to the range of the target BS covered, or in the range of the source BS and the target BS simultaneously covered, by the MSS or the network side to trigger a handover time, MSS transmitted from the air interface handover indication message to the source BS, It indicates the connection status has occurred and switches after the switching, by the source ASN-GW to the service QoS requirements and / or user level, decide whether to support lossless packet service cache mechanism handover.

如果需要,则在源ASN-GW中动态地建立一个针对该MSS的緩存器,所有从CSN经过CSN和ASN-GW之间的隧道发送过来的该MSS的下行数据包信息将緩存在所述緩存器中;对于不需要进行无损迁移的服务,则无须建立緩存器,或者将缓存器的大小设置为O即可。 If necessary, the information of the downlink data packet to establish an MSS, the MSS for all the transmission buffer through the tunnel between the CSN and the ASN-GW CSN dynamically over the source ASN-GW in the cache buffer reactor; do not qualify for lossless migration service, there is no need to establish a buffer, or buffer size is set to O can be.

对于lntra ASN-GW (ASN-GW范围内)切换,建立ASN-GW到目标BS 之间的R6链路以及目标BS到MSS的R1链路,对于Inter ASN-GW (跨ASN-GW范围)切换,建立目标ASN-GW和目标BS之间的R6链路以及目标BS与MSS之间的R1链路。 For (the ASN-GW range) lntra ASN-GW handover, establishment of ASN-GW to the R6 link between the target BS and target BS to the MSS R1 of links for Inter ASN-GW (ASN-GW cross-range) switching establishing a link between R1 and R6 link target BS and the MSS between the target ASN-GW and the target BS. 同时通过源ASN-GW和目标ASN-GW之间的切换过程中信令建立源ASN-GW到目标ASN-GW之间的R4链路,如果R4链路不可建,则直接启动需要改变R3接口的无损切换流程; While by the handover procedure between the source ASN-GW and target ASN-GW signaling source ASN-GW to establish a link between R4 target ASN-GW, if the link is unavailable R4 built directly start to change an R3 interface lossless handover procedure;

源ASN-GW接收到所述切换指示消息后除了启动緩存机制,緩存发送到终端的下行数据包信息,同时还要启动让源BS将没有发送完的数据包信息回传到源ASN-GW的机制; Source ASN-GW after receiving the handover indication message in addition to start caching mechanism, buffers downlink data packets transmitted to the information terminals, but also to start the packet information so that the source BS will not finished sending back to the source of the ASN-GW mechanism;

步骤11:源ASN-GW发送数据链路建立请求给源BS,消息中携带相应的数据链路消息,以及相应的QoS要求,并在消息中标识找回请求以及对应的MSS ID,即表示源BS将该MSS没有发送完的下行数据包信息通过该数据链路转发回来,用以区别所述BS和ASN-GW之间的已有数据链路; Step 11: The source ASN-GW transmits a data link setup request the BS to the source, the message carries the corresponding data link message, and the corresponding QoS requirements, and identified in the message request and retrieve the corresponding MSS ID, it means that the source the information of the BS downlink data packet without sending the MSS forwarded back through data links, for distinction of the existing data link between the BS and the ASN-GW;

步骤12:源BS接收到所述数据链路建立请求后,根据消息中携带的内容 Step 12: When the source BS receives the data link setup request, the content carried in the message

如MSS标识、数据链路标识以及数据链路信息,建立新的数据链路,并发送 The MSS identification, and data link identification information data link, establishing a new data link, and transmitting

数据链路建立响应给源ASN-GW; Data link setup response to the source ASN-GW;

步骤13:源ASN-GW根据接收到的资源配置情况确定源BS是否可以回传 Step 13: The source ASN-GW determines whether the source BS may be returned in accordance with the received resource configuration

数据,并发送数据链路建立应答消息给源BS,此应答消息表明源ASN-GW是 Data and transmits the data link setup response message to the source the BS, this reply message indicates that the source ASN-GW is

否接收准备; No preparation for reception;

步骤14:源BS接收到所述数据链路建立应答消息以后,若新的数据链游、 建立成功,则通过新建的这条数据链路将没有发送完的下行数据包信息发给源ASN-GW;若所述应答消息中表明ASN-GW是否接收准备,即新的数据链3各没有建立成功,则回到步骤11; Step 14: After the source BS receives the data link setup response message, if the new data link travel, successfully established, downlink data packet is not finished sending information sent by the new source of this data link ASN- GW; if the response message indicates whether the ASN-GW reception preparation, i.e. each new data link is not established successfully 3, the process returns to step 11;

步骤15:当源BS将没有发送完的下行数据包信息转发到源ASN-GW完成以后,发送指示消息给源ASN-GW,表明发送完毕。 Step 15: When the source BS downlink data packet forwarding information is not finished sending to the source ASN-GW after completion, sends an indication message to the source ASN-GW, indicating that the transmission is completed.

利用第二种方法即利用原有的ASN-GW和BS的上行数据业务链路实现数据回传的方法,实现数据回传的操作流程如图3所示,参照图3可知,该方法具体包括如下步骤: With the second method i.e. using the up-link data traffic original ASN-GW and the BS implemented method for data return, data return operation flow shown in Figure 3, can be seen with reference to FIG. 3, which method comprises the steps of:

步骤20: MSS从空口发送切换指示消息给源BS,源BS通知到源ASN-GW,源ASN-GW—方面启动缓存机制,缓存发送到终端的下行数据包信息,同时启动让源BS将没有发送完的数据包信息回传到源AS N-GW的过程; Step 20: MSS from the air interface transmits a handover indication message to the source BS, the source BS notifies the source ASN-GW, the source ASN-GW- aspect boot caching mechanism, the cache transmits downlink data terminal packet information, and start to make the source BS will not End packet information sent back to the source of process AS N-GW;

步骤21:源ASN-GW发送数据找回请求给源BS,消息中携带相应的MSS ID,即表示源BS将该MSS没有发送完的下行数据包信息转发回来; Step 21: The source ASN-GW transmits the data request back to the source BS, the message carries the corresponding MSS ID, i.e., forwards the downlink data packet represents an information source BS transmitted without the MSS finished back;

步骤22:源BS收到所述数据找回请求消息以后,根据该MSS的下行数据发送情况,确定准备发送回传数据,并给源ASN-GW发送数据找回响应消自、. Step 22: Retrieve data source BS after receiving the request message, the MSS according to the downlink data transmission, the ready to send data back is determined, and to the source ASN-GW transmits the data retrieved from the response message.

步骤23:源BS在给源ASN-GW发送完数据找回响应消息以后开始利用源BS与源ASN-GW已经建立的针对该MSS的数据链路回传没有发送到MSS的剩余数据,当回传数据传输完毕,源BS发送数据找回应答消息给源ASN-GW,源ASN-GW根据回传标识区分是回传数据还是MSS没有发送完的上行数据包信息;所述的回传标识可以为数据包信息的IP头,根据目的IP地址的不同来区分上行数据包; Step 23: The source BS transmits to the source ASN-GW End Start data retrieved using the data link for the return of the MSS to the MSS does not transmit the remaining data source BS and the source ASN-GW has already established after the response message when back transmitted data transfer is completed, the source BS sends a response message back to the data source ASN-GW, according to the source ASN-GW identifier to distinguish between return data back uplink data packet or sending the information of the MSS is not; the identification may return IP packets with header information, depending on the destination IP address to distinguish uplink data packet;

步骤24:源ASN-GW收到所述数据找回应答消息后,开始转发数据给目标BS,该转发操作也可以在收到源BS转发来的数据,且新的到达目标BS的数据链路建立成功以后。 Step 24: After the source ASN-GW receives the data response message back to start forwarding data to the target BS, the operation may also be forwarded to the forwarding of received data in the source BS, and the new data link reaches the target BS after successfully established.

利用第三种方法即通过数据回传管理信令实现数据回传的方法,实现凄t 据回传的操作流程图如图4所示,参照图4可知,该方法具体包括: The method of using the third method that is implemented by the data backhaul backhaul data management signaling, data manipulation to achieve sad t return flowchart shown in Figure 4, can be seen with reference to FIG. 4, which method comprises:

步骤30: MSS从空口发送切换指示消息给源BS,源BS通知到源ASN-GW,源ASN-GW—方面启动緩存机制,緩存发送到终端的下行数据包信息,同时启动让源BS将没有发送完的数据包信息回传到源ASN-GW的过程; Step 30: MSS from the air interface transmits a handover indication message to the source BS, the source BS notifies the source ASN-GW, the source ASN-GW- aspect boot caching mechanism, the cache transmits downlink data terminal packet information, and start to make the source BS will not End packet information sent back to the source during the ASN-GW;

步骤31:源ASN-GW发送数据找回请求消息给源BS,消息中携带MSS ID,即表示源BS将该MSS没有发送完的下行数据包信息转发回来; Step 31: The source ASN-GW transmits a data request message back to the source BS, the message carries the MSS ID, i.e., forwards the downlink data packet represents an information source BS transmitted without the MSS finished back;

步骤32:源BS收到所述数据找回请求消息以后,将没有发送完的下行数据包封装打包到数据找回响应消息里,发送给源ASN-GW; Step 32: Retrieve data source BS after receiving the request message, without sending the downlink data packets are encapsulated into a data package back in the response message, sent to the source ASN-GW;

步骤33:当源BS转发完毕以后,发送数据找回应答消息给源ASN-GW, 表明源BS转发数据完毕。 Step 33: When the source BS forwards completed, the transmission data response message back to the source ASN-GW, BS indicates that the source data forwarding is completed.

综上所述,本发明利用三种方法实现了发生切换时,将源BS未发送完的数据包信息回传到源ASN-GW的过程,达到了无线接入网络的低丢包率、低时延。 In summary, the present invention uses three methods to achieve a handover process occurs, the packet information source BS incompletely transmitted back to the source ASN-GW, reaching a low radio access network packet loss rate, low delay.

以上所述,仅为本发明较佳的具体实施方式,但本发明的保护范围并不局限于此,任何熟悉本技术领域的技术人员在本发明揭露的技术范围内,可轻易想到的变化或替换,都应涵盖在本发明的保护范围之内。 Above, the present invention is merely preferred specific embodiments, but the scope of the present invention is not limited thereto, any skilled in the art in the art within the scope of the invention disclosed can be easily thought of the changes or Alternatively, it shall fall within the protection scope of the present invention. 因此,本发明的保护范围应该以权利要求的保护范围为准。 Accordingly, the scope of the present invention should be defined by the scope of the claims.

Claims (10)

1、一种切换过程中数据传输的方法,其特征在于,在移动用户站MSS发生切换时,将该MSS切换前的源基站BS中应当发给该MSS,但未发送完的下行数据包回传到源接入服务网络网关ASN-GW,再由源ASN-GW将所述下行数据包发送到目标BS,通过目标BS发送到MSS。 1. A method of data transmission during handover, wherein, when the mobile subscriber station MSS handover occurs, the source base station BS before the handover of the MSS should be sent to the MSS, but sending the downlink data packet back reached the source access service network gateway ASN-GW, then the source ASN-GW transmits the downlink data packet to the target BS, the MSS transmits through the target BS.
2、 如权利要求1所述的一种切换过程中数据传输的方法,其特征在于, 所述回传方法包括:利用新建的数据链路向源ASN-GW回传源BS中未发送完的下行数据包。 2. A method as claimed in data transmission during handover in claim 1, wherein said return method comprising: using the new data link to the source ASN-GW of the source BS backhaul End unsent downlink data packet.
3、 如权利要求2所述的一种切换过程中数据传输的方法,其特征在于, 所述回传方法具体包括:A、 MSS从空口发送切换指示消息给源BS,源BS通知到源ASN-GW, 源ASN-GW启动緩存机制及数据回传机制;B、 源ASN-GW建立到源BS的新的数据链路;C 、源BS利用新建的数据链路将未发送完的下行数据包回传到源ASN-GW。 3, a method as claimed in data transmission during handover in claim 2, wherein said return method specifically includes: A, MSS transmits a handover indication message from the air interface to the source BS, the source BS notifies the source ASN -GW, the source ASN-GW to start the data caching mechanism and return mechanism; B, source ASN-GW to establish a new data link of the source BS; C, the source BS by using the new data link will not transmit downlink data End packet back to the source ASN-GW.
4、 如权利要求3所述的一种切换过程中数据传输的方法,其特征在于, 所述步骤B具体包括:B1、源ASN-GW发送承栽有数据链路消息、服务质量要求、找回请求和/或对应的MSS标识的数据链路建立请求消息给源BS;B2、源BS根据所述消息中承载的内容建立新的数据链路,并发送数据链路建立响应消息给源ASN-GW;B3、源ASN-GW接收到所述响应消息后,发送数据链路应答消息给源BS。 4, a method as claimed in data transmission during handover in claim 3, wherein said step B comprises: B1, the source ASN-GW transmits a data link message bearing planted, quality of service requirements, to find back to the requesting and / or corresponding identifier MSS data link setup request message to the source BS; B2, the source BS to establish a new link according to the data content carried in the message, and sends the data link setup response message to the source ASN -GW; after B3, the source ASN-GW receives the response message, transmits a data link acknowledgment message to the source BS.
5、 如权利要求1所述的一种切换过程中数据传输的方法,其特征在于, 所述回传方法包括:利用已有的数据链路回传源BS中未发送完的下行数据包。 5. The method of claim data transmission during handover in claim 1, wherein said return method comprising: using the existing data link source backhaul downlink data packet transmission is not finished the BS.
6、 如权利要求5所述的一种切换过程中数据传输的方法,其特征在于,所述回传方法具体包括:D、 MSS从空口发送切换指示消息给源BS,源BS通知到源ASN-GW, 源ASN-GW启动緩存机制及数据回传机制;E、 源ASN-GW发送承载有MSS ID的数据找回请求给源BS;F、 源BS利用已有的数据链路将未发送完的下行数据包回传到源ASN-GW。 6. A method as claimed in data transmission during handover according to claim 5, characterized in that the return method comprises: D, MSS transmits a handover indication message from the air interface to the source BS, the source BS notifies the source ASN -GW, the source ASN-GW to start the data caching mechanism and return mechanism; E, the source ASN-GW transmits bearer data MSS ID of the request back to the source BS; F, the source BS using the existing data link unsent After the downlink data packet back to the source ASN-GW.
7、 如权利要求6所述的一种切换过程中数据传输的方法,其特征在于, 所述步骤F包括:源ASN-GW根据接收到的数据包的IP头作为回传标识区分回传数据与MSS的上行数据。 A method of data transmission during handover as claimed in claim 6, characterized in that said step F comprises: a source ASN-GW as a return data based on the identification to distinguish the return header of the received IP packet uplink data and the MSS.
8、 如权利要求1所述的一种切换过程中数据传输的方法,其特征在于, 所述回传方法包括:通过数据回传管理信令实现数据包的回传。 8, a method as claimed in data transmission during handover in claim 1, wherein said return method comprising: implementing a return packet by the return data management signaling.
9、 如权利要求8所述的一种切换过程中数据传输的方法,其特征在于, 所举回传方法具体包括:G、 MSS从空口发送切换指示消息给源BS,源BS通知到源ASN-GW, i、 ASN-GW启动緩存机制及数据回传机制;! H、源ASN-GW发送承载有MSSID的数据找回请求给源BS;I、源BS将未发送完的下行数据包封装后打包到数据找回响应消息中回传到源ASN-GW。 9. A method of data transmission during handover according to claim 8, characterized in that the method comprises return cited: G, MSS transmits a handover indication message from the air interface to the source BS, the source BS notifies the source ASN -GW, i, ASN-GW and the data caching mechanism to start the return mechanism;! H, the source ASN-GW transmits a data carrying MSSID request back to the source BS; I, source BS will not finished sending downlink data packet encapsulation after the data package to retrieve the message back to the source ASN-GW in response.
10、 如权利要求1所述的一种切换过程中数据传输的方法,其特征在于,所述方法还包括:源ASN-GW启动緩存机制,根据业务QoS要求和/或用户等级确定是否緩存下行数据包。 10. A method as claimed in data transmission during handover in claim 1, wherein said method further comprises: the source ASN-GW to start caching mechanism, it is determined whether a cache according to the downlink traffic QoS requirements and / or user level data pack.
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