基于ad+hoc网络的跨层优化设计

基于ad+hoc网络的跨层优化设计

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时间:2019-03-03

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1、杭州电子科技大学硕士学位论文ABSTRACTInrecentyears,withincreasingdemandformobileservicesindifferentscenarios,distributedandself-organizedAdHocnetworkshavebeenrapidlydevelopedandplayamoreandmoreimportantroleinsociallife.However,somematuretechnologyinwirednetworkcannotbedirectlyappliedtotheAdHocnetwork.Howtomaketh

2、ewirednetworkmethodsadapttotheAdHocnetworkhasbecomeahotresearchtopic.TheAdHocnetworkisinherentlymultidimensional,lackofglobalinformation,uncertainandmobile.HowtoguaranteeQoSperformanceforAdHocnetwork,anddesignreasonableandeffectiveresourceallocationschemeisverychallenging.Thesebecomesomemainproble

3、msinAdHocnetwork.ThetraditionalAdHocnetworkusingthelayeringdesign,whichisoflowcomplexity,butthelayersareseparatedandinformationcannotbeshared.Asaresult,thenetworkperformanceispoor,andtheresourceutilizationisnothigh.Cross-layerdesignusestherelevantinformationbetweenlayers,andthenetworkisoptimizedan

4、ddesignedasawhole,whichissuitabletoimprovetheperformanceofAdHocnetwork.Therefore,basedoncross-layeroptimizationideas,thispaperperformsthefollowingresearchesforAdHocnetwork.(1)Across-layertriggeringmechanismforpacketlosstoimprovetheperformanceofAdHocnetwork.ThetraditionalTCPprotocolisdesignedforfix

5、edhostsandwirednetwork,andit’sassumedthatanypacketlossisduetonetworkcongestion.IfthestandardTCPisdirectlyappliedtotheAdHocnetwork,itmayfalselystartthecongestioncontrol,leadingtoperformancedegradation.Across-layermethodcombiningtheMAClayer,networklayerandtransportlayerisproposedtodistinguishdiffere

6、ntpacketlossesinAdHocnetwork,andthepacketlossmayattributetolinkcongestion,routefailureandsignalinterference.Whenpacketlossoccurs,datalosscontrolmechanismistrigged,andaccordingtothecurrentchannelcondition,thelinkmayresponddifferently.Simulationresultsdemonstratetheefficiencyofourschemeintermsofthro

7、ughput,deliveryratioanddelayinAdHocnetwork.(2)AdistributedNewtonmethodforJointrateandpowercontrol.Networkutilitymaximizationmodelisoftenusedforresourceallocationintraditionalwirelessnetwork,basedonthelagrangiandu

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