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1、ABSTRACTABSTRACTVANETsistypicaltechnologyoftheIntelligentTransportationSystem(ITS).Nowadays,VANETstopologycontrolhasbeenpaidmoreandmoreattention.ThemostdistinctivefeatureoftheVANETsisthatitsnetworknodesaremovingwithhighspeed，whichleadstorapidly-changingtopologyandcomplexnetworktopologylog
2、icalredundancy.Idealcommunicationtopologycanimprovetheefficiencyofthenetworkroutingandreducetrafficcongestionvehiclecommunicationconflictsonthenetwork.ThereexistingVANETstopologycontrolalgorithmsarebasedontheideaofclustering,takingthemobilityofthevehiclenetworkintoaccount,clusteringtopolo
3、gycontrolalgorithmandtopologygenerationneedsfrequentmaintenance,efficiencyisnothigh.Sohowtodesignatopologycontrolalgorithmforvehiclestoprovidestablenetworkroutingtopology,isaseriousprobleminVANETs.Firstly,Inthisthesis,FortypicalVANETsscenarios,throughresearchonthesimilaritiesofthebioclust
4、ersystemsandVANETs,aVANETsdynamicevolutionmodelbasedonVicsekmodelhasbeenproposed.Andatopologypredictionmethod,whichcanpredicttopologyofVANETs,basedontheVANETsdynamicpredictionmodel.weusenetworksimulationtool,NS3,tosimulatetheproposedtopologypredictionalgorithm,simulationresultsshowthatthe
5、predictionmethodhasgoodfeasibility.Secondly,accordingtoVANETsdynamicpredictionmodel,wegetthebackbonedegreeofthenodesinVANETs,bycombiningthebackbonedegreeofthenode,thevelocityfactorofthenode,therelativedestinationfactorofthenodeandthedistancefactorofthedistancebetweenthenodeandRSU(RoadSide
6、Unit).Anodereliabilityevaluationmodelhasbeenproposed.Forvehicle-vehiclenetworkinclosecommunicationscenario,Throughintegratingthetopologypredictionmethodandthenodereliabilityevaluationmodel,topologycontrolalgorithmforvehicle-vehiclelocalcommunicationhasbeenproposed.Endtoenddelayandpacketlo
7、ssratesofthealgorithmhavebeensimulated.ThesimulationresultsshowthatthealgorithmcanadaptdynamicsoftheVANETs,thetopologycontrolmethodsignificantlyimprovestheefficiencyoflocalcommunication.Finally,ForthetypicalapplicationscenariosofvehicledownloadsmusiconlineIIABSTRACT
