lte系统中面向高速移动用户的下行分组调度算法研究

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1、北京空通人‘}硕L学何论立ABSTRACTABSTRACT：Asaquasi-4Gtechnology，LTEhasafiatnetworkstructureandOFDM，MIMO．1inkadaptation，fastpacketscheduling，interferencesuppressionandotherkeytechnologiesinordertomeettherequirementofIMT-Advanccdinpeakrate，delay，throughput．usermobility．spgctv

2、ilmefficiency．etcAsthecoreofradioresourcemanagementIjtstpacketschedulingisresponsible南rtheallocationofresourcesanddeterurinesthepertbrmanceofthesystemAtthesametime，withtherapiddevelopmentofhigh—speedrailwayandexpressway，futuremobilecommunicationwilllhcemorehighm

3、obilityenvironmentInhighmobilityenvironmenl，mobilecommunicationsystemwillproducelargeDoppler什equencyshift，andchannelwillchangerapidlyThesechangescanseverelydegadetheperformanceofmobileeommunicafionsystemespeciallyforcelledgeuserswithsefiousinter-cellinterl’erenc

4、eThemainresearchdirectionistoimprovethethroughputofcelledgehighmovingspeeduserseffectivelyFirstofall，thisthesisintroducedthesystemarchilecturerequirements，time—frequencyresourcestructureandkeytecbniquesofL1~Esystem．thenhighlightedLTEpacketschedulerstructureandse

5、veralclassicalschedulingalgorithms(RRalgorithmMaxColalgorithm，PFaIgoritbm)ThesealgorithmsweresimulatedtocomparetheirtbroughputperformanceandfairnessthroughthreerespectsofthenumberofPRBuserassignedprobabilityofuserscheduledandrelationbetweenuserpositionandschedul

6、edprobabilityThesimulationresultsshowthatRRalgorithmhasthebeslfaimessbutthelowestsystemthroughputMaxCoIalgorithmmaximizessystemthroughputwithpoorfairness．andPFalgorithmgetsaIradeoffbeBvcensystemthroughputanduserthimessSecondly，thistbesisstudiedthethimessinnrixsp

7、eedmode．andtbundcelledgehighmo～ingspeeduserssufferedunfairnessTosoh,ethisproblemthisthesisproposedatimedomainTTlAllocationalgorithmandfrequencydomainsoilfrequencyrcusealgorithmI)eingbigbmovingspeedusersTimedomainTT[allocationalgorithmaIIocatesextratimedomain1vr【

8、resources吣celledgehighmovingspeedusersSpecificilnplementationistoallocateonespecificTTItocelledgehighmovingspeeduserseverycertainnumberTIIs，andinthespecificTTIonlycel