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ID:32029958
大小:1.96 MB
页数:61页
时间:2019-01-30
《【硕士论文】AODV路由协议本地修复机制改进研究.pdf》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、论文题目:AODV路由协议本地修复机制改进研究专业:软件工程硕(博)士生:刘勇指导教师:周杰英副教授摘要MANET(移动ADHOC网络)是自组织,无基站的网络。因为无线传输距离的限制,节点常常要经过中间节点才能到达目的节点。每个节点既是主机,同时也是路由器。由于节点的移动性,网络拓扑结构处于不稳定状态,如何对断链链路进行快速有效的修复是MANET研究的重点问题。本文首先介绍了MANET的几种典型的路由协议,接着介绍了本地修复机制的几种算法,讨论了AODV协议的路由本地修复的缺点。接着详细描述了改进路由修复
2、算法一BRSAN-AODV(ALocalRepairMechanismBasedonBackupRouteandStabilityAssessmentofNodeinAODV),该算法可分为备份路由的建立、断链上下游的稳定评估、本地修复三部分。在备份路由的建立中,利用HELLO,SC-HELLO,2hop—RREP,STHO,3hop—RREP等控制消息将活动路由附近的局部拓扑信息记录下来,用于路由修复;在断链上下游的稳定性评估中,通过对上下游周围邻居丢失率计算来评估其稳定性,决定其是否参与路由修复过程,
3、避免了二次修复及丢包问题;本地修复中,使用上下游评估,决定采取不同的修复流程,在不同的修复流程中,使用到备份路由。本文在NS2系统仿真平台上实现了BRSAN-AODV的仿真。通过BRSAN-AODV和传统AODV的路由本地修复算法的仿真性能比较,验证了BRSAN—AODV是可行的,并能满足重负载无线移动Adhoc网络的路由修复需求。关键词:移动Adhoc网络,AODV,本地修复,HELLOTitle:ResearchonImprovementofAODVLocalRecoveryMechanismMajo
4、r:SoftwareEngineeringName:YongLiuSupervisor:JieYingZhou,associateprofessorABSTRACTMANET(MobileADHOCNetworks)iSaself-organizednetworkwithoutanyinfrastructure.Duetothe1imitationofradiopropagationrange.nodesusuallycommtmicatethroughseveralintermediatenodes.E
5、achnodeservesashostandservessimultaneously.Thetopologyofnetworkchangesfrequentlyandrandomlyduetonodes’movement.Howtoquicklyande伍cientlyrepairthebrokenlinkisaveryimportantissuebeingresearchedforalongtime.Inthispaper,sometypicalMANETroutingprotocolsareprese
6、ntedatfirst,thenafewlocalrecoverymechanismsaredescribedandthedisadvantageofAODVrepairmechanismsarediscussed.ThenBRSAN.AODV(ALocalRepairMechanismBasedonBackupRouteandStabilityAssessmentofNodeinAODV)isdescribedindetails:111ealgorithmiScomposedofthreeparts—e
7、stablishingbackuproute.stabilityassessmentofupstreamanddownstreamnodesofthebrokenlink.andlocalrepairprocedure.Somecontrolmessage,suchasHELLO,SC.HELLO,2hop.IU迮P,STHO,3hop.IU也P,areusedtorecordthelocaltopologyinformationofnodesonactiverouteduringthestageofes
8、tablishingbackuproute.Therateofneighborlostisusedtoassessthestabilityoftheupstreamanddownstreamnodeofbrokenactivelink,andtheassessmentiSthenusedtodecidewhetherornotthesenodesshouldtakepartintherouterepairprocess.Las
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