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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
