lte系统下基于mbms无线资源调度方案设计与-研究

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1、Abstract3GPPhadinitiatedthelongtermevolution(LTE)asthedevelopdirectionofthenext-generationwirelessmobilecommunicationattheendof2004.Inordertosatisfytheincreasingdemandforhigherdatarates,MultimediaBroadcastMulticastService(MBMS)wasproposedtomeettherequ

2、irementsofpoint-to-multipointmultimediatransmissionservices.Itservesalargernumberofuserswhohavethesamerequirementswithfewerresources.Butsomeproblemscome:howtoselectthetransmissionrateforthemulticastgroup,howtoallocatetheresourceblockandwhichmulticastg

3、roupcangettheresourceblock.Theseproblemsmaketheschedulingofmulticastservicesmorechallenging.ThisthesismainlydiscussesthewirelessresourceschedulingofMBMSinLTEsystemandanalyzestheperformanceoftheschedulingschemefromtheviewofthesystemlevelsimulation.Asab

4、roadcastsystemrequiresuplinkfeedback,MBMS'sperformanceislimitedbyUEsinpoorconnections.Tothisend,thisthesisproposestwoFrequencyDomainPacketScheduling(FDPS)schemesforthetransmissionofmultimediastreaminginMBMSofLTEnetworks,TLSMSschemeandTLSMS-BOEscheme.T

5、heproposedschemesdividethemultimediastreamingintotwolayerswhicharecharacterizedbytwodifferentflows:thebasiclayerandtheenhancementlayer.Toserveallusersandincreasethethroughputatthesametime,thetwolayersusedifferentschedulingmethodsbaseonthechannelqualit

6、yofUEs.InTLSMSscenario,eachmulticastgroupwillfirstlygettwoRBblocksforitsservice,oneforthetransmissionofbasiclayer,andtheotherforenhancementlayer.ThentheremindingRBblockswillbeallocatedforthetransmissionofenhancementlayertothemulticastgroupwhohasthelow

7、estthroughput.InTLSMS-BOEscenario,alltheRBblocksarefirstlyallocatedtothemulticastgroupsforthetransmissionofenhancementlayer.TheneachmulticastgroupwillselectanallocatedRBblockinwhichtheenhancementservicewillbereplacedbythebasicservice.Theruleofselectio

8、nistominimizethelossofthroughput.Theoreticalanalysisandsimulationshowthatinpracticalapplication,thesuggestedschemesareofpracticallyvaluableastheyhavebettersystemperformanceincomparisonwiththeexistingapproaches.TLSMSscenariohasbetterperformance