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ID:39099934
大小:2.87 MB
页数:86页
时间:2019-06-24
《Ad+Hoc上TCP协议分析与改进》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、ABSTRACTAsthemostwidespreadtransportlayerprotocol,TCPWaSoriginallydesignedfor丘xedwirednetworkandwasonlyfitforit.AdHoeNetworkisadistributednetworkwhichhasnewfeaturesofthelowerlayersthatcouldbewildlydifferentwi也thetraditionalnetwork.TCPCallnotdealwimtheseilewfeaturesSOitsperformancedropsdramaticall
2、y.Asaresult,thekeytoimproveAdHoe’sperformancedependsOneitherTCP’sevolutionofrefitandredesign,01"Onstrenghtheningthefi'agilelowlayersofAdHocitscl£ThisissueisfocusedOntheAdHoeprotocolstackresearchandretrofit.IEEE802.11DCF,AODVDSRprotocolandTCP—Renoaleselectedillstheprotocolstackoflinklayer,networkl
3、ayerandtransportlayer.ResearchesareconcentratedOiltheexploitingofnetwork’sundevelopedinformation.Themoreusefulinformationthereis,themolecapablethenodesCallbewhenfacingperplexnetworkenvironment.Thebottleneckdetectandeliminatemethod,frameerrorratiobasedlinkstatusevaluateandpredictmechanism,stabilit
4、yfirstroutingmethodforAODVprotocolandsuccessfullyrecievedpacketratiobasedTCPcongestionwindowsmodifymechanismareproposed.TheyareallbasedOnminingandusingtheunderlyinginformationofnetwork.(1)ThecompetitionsofAdHoeMAClayerisveryfierceandbottlenecksareeasytoshape.Togivethebottlenecknodesmoreadvantages
5、inchannelcompetition,thebottleneckdetectandeliminatemethodisusedtofindandhelpthesenodes,lettingthemoccupythechannelfasterandeasethetensionofthenetworkbottleneck.(2)Theframeerrorratiobasedlinkstatusevaluateandpredictmechanismevaluateandpredictthechannelqualitywithoutincreasinganynetworkcost.Thisme
6、chanismcangetanaccuratedepictionofthesechannelsandthenlaunchcertainpolicies.(3)BasedOnthismechanism,inthenetworklayer,stabilityfirstroutingmechanismforAODVprotocolchangedthewaythatAODVusedtopickbestIllABSTRACTroute,whichwasroutingbyminimumhops.Thenewmechanismchoosesthemoststableroutewhenroutingan
7、dlaunchesare-routingwhentheMAClayerhaspredictedaneighborvanishing,thusenhancesthestabilityofactivenetworklayerroutesanddecreasesthepossibilityofroutebreakdown,finallyraisestheentirethroughputofthewholenetwork.(4)TCP—Re
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