车载ad+hoc网络中基于位置的路由协议分析

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1、hoenetworksarenotfitforVANET,asitneedstoconsumealotoftheavailablebandwidthformaintainingunusedpaths，andVANEThasitsownfeaturessuchasthelimitedbandwidth，thefrequentlychangingtopology,thelinkthatiseasyinterferedandlimitedtransmissionrangeetc．Asaconsequence，designingarapidandefficientroutingprotocol

2、isoneofmainstudyonVANET．Positionroutingprotocol，whichroutingdecisionneednottoestablishandmaintainroutingtable，USeSgeographypositiontoachievesmallper-noderoutingstate，smallroutingprotocolmessagecomplexityandextremelyrobustpacketdeliveryondenselydeployedwirelessnetworks，iswellusedinsuchscenarioasn

3、etworkwithmanynodesandtopologychangefrequently．Itmainlyincludespacketforwardingstrategyandlocationservice．LocationserviceforAdnetworksisusedtolocatethegeographicpositionofagivennodeinthenetwork．Oneofthemainusagesoflocationservicesisinposition-basedroutingalgorithms．Inparticular,positionroutingpr

4、otocolscanroutepacketsmoreefficientlytotheirdestinationsbasedonthedestinationnode’Sgeographicalpositionprovidedbylocationservice．’Inthispaper,position-basedroutingprotocolsforVANETandlocationservicemechanismareresearchedandanalyzed，theexistingproblemsofusinglocationservicedesignedformobileAdnetw

5、orksinVANEThavebeenfoundout，andtherelativesolutionisproposedinthispaper．Themainresearchcontentinthispaperisfocusingonfivepartsasfollows：Firstly,weexpatiatethesignificanceandbackgroundofresearchinginter-vehiclecommunicationanditsrelatives，giveananalysistothecurrenttrends，challengeandthedevelopmen

6、tinthisarea，surveysomeoftherecentresearchresultsonroutingprotocolsforvehicularnetworks，analyzesomeoftheresearchingchallengesthatstillneedtobeaddressedreferredtoposition-basedroutingprotocolandlocationservicemechanismforVANET．Secondly,weanalyzeandcomparetheperformanceontopology-basedroutingprotoc

7、ols(AOD、，andDSR)andposition-basedroutingprotocol(GPSR)byprovidingasimulationformobileAdhocnetworks．Simulationresultsindicate，comparedwithDSRandAODV,statelessprotocolGPSRgreatlyenhancesthethroughputanddecreasesthelossrateandt