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1、浙江工業(yè)大學碩士學位論文RESEARCHONKEYTECHNOLOGIESOFCHANNELACCESSANDRESOURCEALLOCATIONFORWIRELESSBODYAREANETWORKSABSTRACTWirelessbodyareanetwork(WBAN)isanetworkcomprisedofwearableorimplantedsensorsaroundorinsidehumanbody.Inthisdissertation,wefocusonthekeytechnologiesofchannelaccessandresourcealloca
2、tionissuesinWBAN.First,IEEE802.15.6isacommunicationstandarddevelopedforWBAN.Modelingandanalysisofthestandardisfavorabletoperformanceforecastandsystemoptimization.Second,changesofthebodypostureorpositionwillincurshadeeffectbetweensensornodesandthecoordinatorandthusleadtopackettransmissi
3、onfailure.Itisthereforeindispensabletodesignatransmissionstrategythatcanadapttothetime-varyingchannelquality.Third,WBANsaregenerallydenselydistributed.InterferencefromcoexistingnearbyWBANscouldcausenetworkperformancedegradation.Itisthereforeessentialtostudyhowtoallocatethepowerresource
4、samongdifferentWBANssoastoensureQoSofdifferentdatapriorities.Basedontheabove-mentionedissues,themajorworkofthisdissertationisasfollows:1.TounderstandtheintrinsicnatureofIEEE802.15.6communicationstandarddesignedforWBAN,theCSMA/CAchannelaccessmechanismundersaturationconditionismodeledbyM
5、arkovchaintoanalyzethethroughput,successfulpacketdeliveryrate,anddelay.Simulationresultsconfirmtheaccuracyofthemodelanalysis.Bothanalysesandsimulationresultsshowthatthisstandardnotonlyprovidesdifferentiatedservicefordifferentprioritiesbutalsoindicatesthatundersaturationconditionthemedi
6、umismostlypreemptedbythehighestpriority,whilestarvingotherpriorities.2.Toadapttotime-varyingcharacteristicofthechannelquality,abursttransmissionstrategyisproposedwhichforecaststhenumberofredundanttransmissionsbasedonchannelestimation.Theenergyconsumption,successfulpacketreceptionratean
7、dthetransmissiondelayundertheproposedstrategyareanalyzed.Simulationresultsshowthattheproposedtransmissionstrategyeffectivelyreducestheenergyconsumptionandtransmissiondelaywhichstillmaintainsthereliabilitycomparedwithtraditionaltransmissionmethod.3.Tosolvetheinter-WBANinterferenceprob
