WO2011150630A1 - 一种链路选择的方法和基站 - Google Patents
一种链路选择的方法和基站 Download PDFInfo
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- WO2011150630A1 WO2011150630A1 PCT/CN2010/078565 CN2010078565W WO2011150630A1 WO 2011150630 A1 WO2011150630 A1 WO 2011150630A1 CN 2010078565 W CN2010078565 W CN 2010078565W WO 2011150630 A1 WO2011150630 A1 WO 2011150630A1
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 230000004044 response Effects 0.000 claims description 36
- 230000001934 delay Effects 0.000 abstract 1
- 230000007246 mechanism Effects 0.000 description 7
- 238000004904 shortening Methods 0.000 description 3
- 238000007792 addition Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/08—Reselecting an access point
Definitions
- the present invention relates to the field of data communications, and in particular, to a method and base station for link selection. Background technique
- a mobile station (MS) 40 for a mobile station, a serving base station 20, a target base station 30, and an access gateway (ASN Gate Way, AGW) 10.
- Network Entities, NE the link between the serving base station 20 or the target base station 30 and the AGW is an R6 link, and the link between the serving base station 20 and the target base station 30 is an R8 link.
- the service base station 20 When switching to the target base station 30, the service base station 20 directly passes the AGW 10 to the target base station 30 because the delay of the serving base station 20 to the target base station 30 through the AGW 10 cannot be compared and the time delay of the serving base station 20 to the target base station 30 is directly changed. That is, the R6 link is selected for communication, and sometimes the delay of the serving base station 20 directly switching to the target base station 30, that is, the R8 link, is shorter, in which case the serving base station 20 loses the opportunity to select a shorter path, and cannot Base station switching is achieved more quickly. Summary of the invention
- the main object of the present invention is to provide a method and base station for link selection, which implements fast handover of MS between base stations.
- the present invention provides a method for link selection, including:
- the serving base station calculates an R6 link delay and an R8 link delay, where the R6 link is between the serving base station or the target base station and the adjacent access gateway AGW. a link, the R8 link is a link between the serving base station and the target base station;
- the R8 link is selected for communication.
- the R6 link delay is less than or equal to the R8 link, the R6 link is selected for communication.
- the step of the serving base station calculating the R6 link delay comprises: Sending, by the serving base station, a handshake message to the neighboring AGW, and receiving a response message sent by the neighboring AGW, where the response message carries a timestamp of the neighboring AGW;
- the R6 link delay is obtained by comparing the timestamp of the response message with the current time of the local clock.
- the step of the serving base station calculating the delay of the R8 link includes:
- the serving base station sends a handshake message to the neighboring AGW, and receives a response message sent by the neighboring AGW, where the response message carries a timestamp of the neighboring AGW;
- the R8 link delay is obtained.
- a link delay between the serving base station and the neighboring AGW is equal to a link delay between the target base station and the neighboring AGW.
- the step of the serving base station selecting the R6 link or the R8 link for communication comprises: exchanging a handover message between the serving base station and the target base station.
- the present invention also provides a base station, where the base station is configured to: when the R6 link and the R8 link are simultaneously connected, calculate an R6 link delay and an R8 link delay, where the R6 link is a base station or a target base station a link between the adjacent access gateway AGW, the R8 link is a link between the base station and the target base station; and comparing the R6 link delay by 2 times and the R8 link delay; When the delay of the R6 link is twice as long as the delay of the R8 link, the R8 link is selected for communication. When the delay of the R6 link is less than or equal to the delay of the R8 link, the R6 link is selected for communication.
- the base station is configured to calculate an R6 link delay in the following manner:
- the base station is configured to calculate an R8 link delay in the following manner:
- the link delay between the local base station and the neighboring AGW is equal to the target base station and the The link delay between adjacent AGWs.
- the base station is arranged to communicate in the following manner: an exchange handover message with the target base station.
- the invention provides a method and a base station for performing link selection based on a keep-alive mechanism, and compares a delay between a serving base station and a target base station by using an AGW, and a delay of the serving base station directly switching to the target base station.
- the communication is performed through the R6 link or the R8 link, which shortens the delay of the base station handover and realizes the fast handover of the MS between the base stations.
- 1 is a schematic structural diagram of an existing WiMAX network
- FIG. 2 is a flowchart of a method of an embodiment of a method for link selection according to the present invention
- FIG. 3 is a flow chart of a method for calculating a delay of an R6 link according to an embodiment of a method for link selection according to the present invention
- FIG. 4 is a flow chart of a method for calculating an R8 link delay according to an embodiment of a method for link selection according to the present invention.
- the method and the base station for selecting a link according to the present invention are based on the Keep-alive mechanism, and compare the delay of the serving base station to the target base station through the AGW and the delay of the serving base station directly switching to the target base station, and select the R6 link. Or R8 link for communication.
- the Keep-alive mechanism is a connection detection mechanism, where a network element sends a peer to the peer network element.
- an embodiment of a method for performing link selection based on the Keep-alive mechanism of the present invention including:
- Step 101 When the R6 link and the R8 link are simultaneously connected, the serving base station calculates an R6 link delay and an R8 link delay, where the R6 link is a link between the serving base station or the target base station and the adjacent AGW.
- the R8 link is a link between the serving base station and the target base station;
- the link delay between the serving base station and the neighboring AGW is equal to the link delay between the target base station and the neighboring AGW;
- Step 102 Compare the delay of the R6 link by 2 times and the R8 link delay.
- Step 103 When the R6 link delay is twice as long as the R8 link delay, the R8 link is selected for communication, otherwise the R6 link is selected for communication.
- step 101 specifically includes:
- Step 201 The serving base station sends a handshake message to the neighboring AGW, and receives a response message sent by the neighboring AGW, where the response message carries the timestamp of the neighboring AGW.
- Step 202 Compare the timestamp of the response message with the current time of the local clock to obtain the delay of the R6 link.
- step 101 further includes:
- Step 301 The serving base station sends a handshake message to the target base station, and receives a response message sent by the target base station, where the response message carries a timestamp of the target base station.
- Step 302 Compare the timestamp of the response message with the current time of the local clock to obtain the delay of the R8 link.
- the foregoing serving base station selects an R6 link or an R8 link for communication, specifically, an exchange handover message such as a HOReq message, a HORsp message, a HOConfirm message, a HOComplete message, and a HOAck message between the serving base station and the target base station.
- an exchange handover message such as a HOReq message, a HORsp message, a HOConfirm message, a HOComplete message, and a HOAck message between the serving base station and the target base station.
- the invention provides a method for link selection based on the Keep-alive mechanism, which compares the delay of the serving base station to the target base station through the AGW and the delay of the serving base station directly switching to the target base station, and selects the R6 link or the R8.
- the link communicates, shortening the delay of base station handover, and realizing Fast base station switching.
- the present invention also provides a base station, configured to calculate an R6 link delay and an R8 link delay when the R6 link and the R8 link are simultaneously connected, and the R6 link is between the base station or the target base station and the adjacent AGW.
- Link the R8 link is the link between the base station and the target base station; and compares the R6 link delay by 2 times and the R8 link delay; and when the R6 link delay is twice as large as the R8 link Time delay, select the R8 link for communication, otherwise select the R6 link for communication.
- the link delay between the base station and the neighboring AGW is equal to the link delay between the target base station and the neighboring AGW.
- the base station is specifically used for:
- the base station is further used to:
- the base station is configured to exchange handover messages with the target base station, such as a HOReq message, a HORsp message, a HOConfirm message, a HOComplete message, and a HOAck message.
- handover messages such as a HOReq message, a HORsp message, a HOConfirm message, a HOComplete message, and a HOAck message.
- the base station proposed by the present invention compares the delay of the base station to the target base station by the AGW and the delay of the base station directly switching to the target base station, and selects to communicate through the R6 link or the R8 link, thereby shortening the base station handover. Delay, enabling fast base station handover.
- the method and the base station for selecting a link according to the present invention are based on the Keep-alive mechanism, and compare the delay of the serving base station to the target base station through the AGW and the delay of the serving base station directly switching to the target base station, and select the R6 link. Or the R8 link communicates, shortening the delay of the base station handover, and realizing the fast handover of the MS between the base stations.
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Abstract
本发明揭示了一种链路选择的方法和基站,所述方法包括:当R6链路和R8链路同时连通时,服务基站计算R6链路时延和R8链路时延,所述R6链路为所述服务基站或目标基站和相邻接入网关AGW之间的链路,所述R8链路为所述服务基站与所述目标基站之间的链路;比较R6链路时延的2倍和R8链路时延;当R6链路时延的2倍大于R8链路时延时,选择R8链路进行通讯,否则选择R6链路进行通讯。本发明通过比较服务基站通过AGW切换到目标基站的时延和服务基站直接切换到目标基站的时延,进行通讯链路的选择,实现了MS在基站之间的快速切换。
Description
一种链路选择的方法和基站
技术领域
本发明涉及到数据通信领域, 特别涉及到一种链路选择的方法和基站。 背景技术
参照图 1 , 在全球互联微波接入 ( WiMAX ) 网络中, 存在终端 ( Mobile Station, MS ) 40、 服务基站 20、 目标基站 30和接入网关 (ASN Gate Way , AGW ) 10等各个网元(Network Entities, NE ) , 服务基站 20或目标基站 30 与 AGW之间的链路为 R6链路, 服务基站 20与目标基站 30之间的链路为 R8链 路, 目前, 当 MS40需要从服务基站 20切换到目标基站 30时, 由于无法比较服 务基站 20通过 AGW10切换到目标基站 30的时延和服务基站 20直接到切换到 目标基站 30的时延,通常服务基站 20直接通过 AGW10到目标基站 30即选择 R6 链路进行通讯, 而有时服务基站 20直接切换到目标基站 30即 R8链路的时延会 更短, 在这种情况下服务基站 20就失去了选择更短路径的机会, 而无法更快 速地实现基站切换。 发明内容
本发明的主要目的为提供一种链路选择的方法和基站, 实现 MS在基站之 间的快速切换。
本发明提出一种链路选择的方法, 包括:
当 R6链路和 R8链路同时连通时, 服务基站计算 R6链路时延和 R8链路时 延, 所述 R6链路为所述服务基站或目标基站和相邻接入网关 AGW之间的链 路, 所述 R8链路为所述服务基站与所述目标基站之间的链路;
比较 R6链路时延的 2倍和 R8链路时延; 以及
当 R6链路时延的 2倍大于 R8链路时延时, 选择 R8链路进行通讯, 当 R6链 路时延的 2倍小于等于 R8链路时延时选择 R6链路进行通讯。
优选地, 所述服务基站计算 R6链路时延的步骤包括:
所述服务基站发送握手消息至所述相邻 AGW, 以及接收所述相邻 AGW 发送的响应消息, 所述响应消息携带所述相邻 AGW的时间戳; 以及
对比所述响应消息的时间戳和本端时钟的当前时间, 得到 R6链路时延。 优选地, 所述服务基站计算 R8链路的时延的步骤包括:
所述服务基站发送握手消息至所述相邻 AGW, 以及接收所述相邻 AGW 发送的响应消息, 所述响应消息携带所述相邻 AGW的时间戳; 以及
对比所述响应消息的时间戳和本端时钟的当前时间, 得到 R8链路时延。 优选地, 所述服务基站与所述相邻 AGW之间的链路时延等于所述目标基 站与所述相邻 AGW之间的链路时延。
优选地, 所述服务基站选择 R6链路或 R8链路进行通讯的步骤包括: 在所 述服务基站和所述目标基站之间交互切换消息。
本发明还提出一种基站, 所述基站设置为: 当 R6链路和 R8链路同时连通 时, 计算 R6链路时延和 R8链路时延, 所述 R6链路为本基站或目标基站与相邻 接入网关 AGW之间的链路, 所述 R8链路为本基站与所述目标基站之间的链 路; 以及比较 R6链路时延的 2倍和 R8链路时延; 以及当 R6链路时延的 2倍大于 R8链路时延时, 选择 R8链路进行通讯, 当 R6链路时延的 2倍小于等于 R8链路 时延时 , 选择 R6链路进行通讯。
优选地, 所述基站是设置为以如下方式计算 R6链路时延:
发送握手消息至所述相邻 AGW, 以及接收所述相邻 AGW发送的响应消 息, 所述响应消息携带所述相邻 AGW的时间戳; 以及对比所述响应消息的时 间戳和本端时钟的当前时间, 得到所述 R6链路时延。 优选地, 所述基站进是设置为以如下方式计算 R8链路时延:
发送握手消息至所述目标基站,以及接收所述目标基站发送的响应消息, 所述响应消息携带所述目标基站的时间戳; 以及对比所述响应消息的时间戳 和本端时钟的当前时间, 得到所述 R8链路时延。
优选地,本基站与所述相邻 AGW之间的链路时延等于所述目标基站与所
述相邻 AGW之间的链路时延。
优选地, 所述基站是设置为以如下方式进行通信: 与所述目标基站之间 交互切换消息。
本发明提出的一种基于保活( Keep-alive )机制进行链路选择的方法和基 站,通过比较服务基站通过 AGW切换到目标基站的时延和服务基站直接切换 到目标基站的时延, 选择通过 R6链路或 R8链路进行通讯, 缩短了基站切换的 时延, 实现了 MS在基站之间的快速切换。 附图概述
图 1为现有 WiMAX网络的结构示意图;
图 2为本发明链路选择的方法的一实施例的方法流程图;
图 3为本发明链路选择的方法的一实施例的计算 R6链路时延的方法流程 图;
图 4为本发明链路选择的方法的一实施例的计算 R8链路时延的方法流程 图。
本发明目的的实现、 功能特点及优点将结合实施例, 参照附图做进一步 说明。 本发明的较佳实施方式
本发明提出的一种链路选择的方法和基站, 基于 Keep-alive机制, 通过比 较服务基站通过 AGW切换到目标基站的时延和服务基站直接切换到目标基 站的时延, 选择通过 R6链路或 R8链路进行通讯。
Keep-alive机制是一个连接检测机制, 是指一网元给对端网元发送一个
Keep-Alive REQ消息 , 对端网元如果收到这个数据 , 回送一个 Keep-Alive RSP 消息, 确认 Keep-Alive REQ消息已经收到, 以确定此两个网元连接没有被断 开。
参照图 2 , 提出本发明基于 Keep-alive机制进行链路选择的方法的一实施 例, 包括:
步骤 101 , 当 R6链路和 R8链路同时连通时, 服务基站计算 R6链路时延和 R8链路时延, 该 R6链路为服务基站或目标基站和相邻 AGW之间的链路, 该 R8链路为服务基站与目标基站之间的链路;
服务基站与相邻 AGW之间的链路时延等于目标基站与相邻 AGW之间的 链路时延;
步骤 102 , 比较 R6链路时延的 2倍和 R8链路时延;
步骤 103 ,当 R6链路时延的 2倍大于 R8链路时延时,选择 R8链路进行通讯, 否则选择 R6链路进行通讯。
参照图 3 , 步骤 101具体包括:
步骤 201 , 服务基站发送握手消息至相邻 AGW, 以及接收相邻 AGW发送 的响应消息, 该响应消息携带相邻 AGW的时间戳;
步骤 202,对比该响应消息的时间戳和本端时钟的当前时间,得到 R6链路 的时延。
参照图 4, 步骤 101还包括:
步骤 301 ,服务基站发送握手消息至目标基站, 以及接收目标基站发送的 响应消息, 该响应消息携带目标基站的时间戳;
步骤 302,对比响应消息的时间戳和本端时钟的当前时间,得到 R8链路的 时延。
上述服务基站选择 R6链路或 R8链路进行通讯具体为在服务基站和目标 基站之间交互切换消息如 HOReq消息、 HORsp消息、 HOConfirm消息、 HOComplete消息和 HOAck消息。
本发明提出的一种基于 Keep-alive机制进行链路选择的方法, 通过比较服 务基站通过 AGW切换到目标基站的时延和服务基站直接切换到目标基站的 时延, 选择通过 R6链路或 R8链路进行通讯, 缩短了基站切换的时延, 实现了
快速基站切换。
本发明还提出一种基站, 用于当 R6链路和 R8链路同时连通时, 计算 R6 链路时延和 R8链路时延, R6链路为本基站或目标基站与相邻 AGW之间的链 路, R8链路为本基站与目标基站之间的链路; 以及比较 R6链路时延的 2倍和 R8链路时延; 以及当 R6链路时延的 2倍大于 R8链路时延时, 选择 R8链路进行 通讯, 否则选择 R6链路进行通讯。
本基站与相邻 AGW之间的链路时延等于目标基站与相邻 AGW之间的链 路时延。
本基站具体用于:
发送握手消息至相邻 AGW, 以及接收相邻 AGW发送的响应消息, 该响 应消息携带该相邻 AGW的时间戳; 以及对比该响应消息的时间戳和本端时钟 的当前时间, 得到 R6链路的时延。
本基站进一步用于:
发送握手消息至目标基站, 以及接收目标基站发送的响应消息, 该响应 消息携带目标基站的时间戳; 以及对比该响应消息的时间戳和本端时钟的当 前时间, 得到 R8链路的时延。
本基站用于与目标基站之间交互切换消息,如 HOReq消息、 HORsp消息、 HOConfirm消息、 HOComplete消息和 HOAck消息。
本发明提出的一种基站,通过比较本基站通过 AGW切换到目标基站的时 延和本基站直接切换到目标基站的时延, 选择通过 R6链路或 R8链路进行通 讯, 缩短了基站切换的时延, 实现了快速基站切换。
尽管为示例目的, 已经公开了本发明的优选实施例, 本领域的技术人员 将意识到各种改进、 增加和取代也是可能的, 因此, 本发明的范围应当不限 于上述实施例。
本领域普通技术人员可以理解上述方法中的全部或部分步骤可通过程序 来指令相关硬件完成, 所述程序可以存储于计算机可读存储介质中, 如只读
存储器、 磁盘或光盘等。 可选地, 上述实施例的全部或部分步骤也可以使用 一个或多个集成电路来实现。 相应地, 上述实施例中的各模块 /单元可以釆用 硬件的形式实现, 也可以釆用软件功能模块的形式实现。 本发明不限制于任 何特定形式的硬件和软件的结合。
工业实用性
本发明提出的一种链路选择的方法和基站, 基于 Keep-alive机制, 通过比 较服务基站通过 AGW切换到目标基站的时延和服务基站直接切换到目标基 站的时延, 选择通过 R6链路或 R8链路进行通讯, 缩短了基站切换的时延, 实 现了 MS在基站之间的快速切换。
Claims
1、 一种链路选择的方法, 其包括:
当 R6链路和 R8链路同时连通时,服务基站计算 R6链路时延和 R8链路 时延,所述 R6链路为所述服务基站或目标基站和相邻接入网关 AGW之间的 链路, 所述 R8链路为所述服务基站与所述目标基站之间的链路;
比较 R6链路时延的 2倍和 R8链路时延; 以及
当 R6链路时延的 2倍大于 R8链路时延时, 选择 R8链路进行通讯, 当 R6链路时延的 2倍小于等于 R8链路时延时, 选择 R6链路进行通讯。
2、 如权利要求 1所述的方法, 其中, 所述服务基站计算 R6链路时延的 步骤包括:
所述服务基站发送握手消息至所述相邻 AGW, 以及接收所述相邻 AGW 发送的响应消息, 所述响应消息携带所述相邻 AGW的时间戳; 以及
对比所述响应消息的时间戳和本端时钟的当前时间, 得到 R6链路时延。
3、 如权利要求 1或 2所述的方法, 其中, 所述服务基站计算 R8链路的 时延的步骤包括:
所述服务基站发送握手消息至所述相邻 AGW, 以及接收所述相邻 AGW 发送的响应消息, 所述响应消息携带所述相邻 AGW的时间戳; 以及
对比所述响应消息的时间戳和本端时钟的当前时间, 得到 R8链路时延。
4、如权利要求 1或 2所述的方法,其中,所述服务基站与所述相邻 AGW 之间的链路时延等于所述目标基站与所述相邻 AGW之间的链路时延。
5、 如权利要求 1或 2所述的方法, 其中, 所述服务基站选择 R6链路或 R8链路进行通讯的步骤包括: 在所述服务基站和所述目标基站之间交互切换 消息。
6、 一种基站, 所述基站设置为: 当 R6链路和 R8链路同时连通时, 计 算 R6链路时延和 R8链路时延, 所述 R6链路为本基站或目标基站与相邻接 入网关 AGW之间的链路,所述 R8链路为本基站与所述目标基站之间的链路; 以及比较 R6链路时延的 2倍和 R8链路时延; 以及当 R6链路时延的 2倍大 于 R8链路时延时, 选择 R8链路进行通讯, 当 R6链路时延的 2倍小于等于 R8链路时延时 , 选择 R6链路进行通讯。
7、 如权利要求 6所述的基站, 所述基站是设置为以如下方式计算 R6链 路时延:
发送握手消息至所述相邻 AGW, 以及接收所述相邻 AGW发送的响应消 息, 所述响应消息携带所述相邻 AGW的时间戳; 以及对比所述响应消息的 时间戳和本端时钟的当前时间, 得到所述 R6链路时延。
8、 如权利要求 6或 7所述的基站, 所述基站是设置为以如下方式计算
R8链路时延:
发送握手消息至所述目标基站,以及接收所述目标基站发送的响应消息, 所述响应消息携带所述目标基站的时间戳; 以及对比所述响应消息的时间戳 和本端时钟的当前时间, 得到所述 R8链路时延。
9、 如权利要求 6或 7所述的基站, 其中, 本基站与所述相邻 AGW之间 的链路时延等于所述目标基站与所述相邻 AGW之间的链路时延。
10、 如权利要求 6或 7所述的基站, 所述基站是设置为以如下方式进行 通信: 与所述目标基站之间交互切换消息。
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WO2009067637A1 (en) * | 2007-11-21 | 2009-05-28 | Nortel Networks Limited | Computing an action time for allocation of resources to a mobile station that is handing over from a source to a target base station |
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