异构无线网络资源管理

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1、万方数据上海交通大学硕士学位论文ABSTRACTResourceManagementinHeterogeneousNetworksABSTRACTWiththedevelopmentofwirelesscommunicationtechnologyandtheusageofdifferentmobileterminals,thewirelesstraffichasskyrocketedinrecentyears.Ithasbeendifficultfortraditionalcellularnetworktomeetthishugetrafficdemand.T

2、heheterogeneousnetworkwhichcombinesmacrobasestationsandmicrobasestationscanimprovethesystemthroughput,anditbecomesthemainnetworkarchitecture.Therearetwomainproblemsofresourcemanagementinheterogeneousnetworks.Ononehand,theuplinkanddownlinktrafficisasymmetricinheterogeneousnetwork

3、,andamajorchallengeishowtochoosetheoptimaluplink/downlinkconfiguration.Ontheotherhand,forthelackofthespectrumthechallengeishowthemicrobasestationworksonunlicensedband.Fortheasymmetricuplinkanddownlinktraffic,aQ-learningbaseddynamicu-plink/downlinkconfigurationforTDDsystemispropose

4、d.Itcantakeboththetrafficdemandandthechannelconditionintoconsideration.Eachbasestationneedsalearn-ingphasetoobtainitsbestpolicy.Q-learningbasedmethodcanhandlethediscretestateproblem,butthestateinourproblemiscontinuous.SowefurtherusethefuzzyQ-learningmethodtochoosetheuplink/downl

5、inkconfiguration.ItisshowninoursimulationresultsthatthefuzzyQ-learningmethodhasfasterconvergencespeedandhighercellaveragepacketthroughputthantheQ-learningmethod.Andtheproposedmethodsachievethehighercellaveragepacketthroughputcomparedtothequeue-awaredynamicmethodandthefixedmethod

6、.Forlackofthespectrumresource,usingtheunlicensedbandcanfurtherimprovethesystemthroughput.SoweproposeaschemethatLTEsystemworksonunlicensedband.Bychangingthepartsthatarethecarriersensing,thebackoffschemeandthetransmitprocedure,wecanusetheCSMA-basedMACincentralizedsystem.Oursimula

7、tionresultsshowthatCSMA-basedMACispreferableinisolatedcellscenario.—iii—万方数据异构无线网络资源管理上海交通大学硕士学位论文Inaddition,theinterferencebetweendifferentcellsisanimportantlimitingfactortoimprovethecellaveragepacketthroughputforCSMA-basedMAC.Ourresearchcanprovidereferenceforstandardizationwo

8、rkinthefuture.KEYWORDS:heterogeneousnetworks,femtocell,resour