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1、AbstractWiththerapiddevelopmentofwirelesscommunicationandInternet,users’sdemandformobilenetworkbandwidth,datatransferrateandqualityofnetworkserviceisgrowing.Inordertomeettherequirementsofdatatransmissioninthefuture,3GPPintroducesLTE-Advanced,whichistheevolutionversionofLTE.ButinLTE/LTE-
2、Asystem,users'stypeofservciesisgrowing,anddifferenttypesofservicehavadifferentdemands.Howtoutilizethelimitedradioresourcestoserveasmayuserspossiblehasbeenanimportantresearchtopicinthefieldofmobilecommunication.BasedontheorystudyofLTE-AprotocolRelease10,thispaperfocusesoncontentsrelatedt
3、odownlinkschedulinginLTE/LTE-A,itmainlyfinishedthefollowingwork:Firstly,studybasicflowandkeytechnologyinLTE/LTE-Adownlinkscheduling.Basedonthis,buildingtheLTE/LTE-AsystemlevelsimulationplatformandrealizationofdownlinktimeschedulingandCCEresourceallocationmoduleisachevied.Secondly,makeas
4、tudyandtheoreticalanalysisofthedownlinkLTE/LTE-Asystemresourceschedulingalgorithm,andastheexistingalgorithmscannotsatisfytheQoSdemandofdifferentbearingverywell,thispaperproposesanimprovedresourceschedulingalgorithmbasedonQoSofthebearing.Thealgorithmallocatesaprioritytoeachradiobearerbas
5、edonQoSclass,cachestateandotherinformationofthebear.Thesystemdeterminestheusersthattobeallocatedradioresourcesaccordingtothepriorityofradiobearers.Inordertoreducethecomplexityofthealgorithm,apre-selectionmoduleisaddedtothealgorithm,itremovesalltheusersandradiobearsthatcann’tbescheduled.
6、ThesimulationresultsshowthattheimprovedschedulingalgorithmensuresthetransmissionrateoftheGBRbearers,improvesthethroughputofNon-GBRbearersandreducesthepacketlossrateofthesystem.Thirdly,studyLTE/LTE-AsystemdownlinkcontrolchannelresourceallocationII万方数据algorithmindepth.AstheCCEresourceutil
7、izationofexsitingalgorithmsisnothigh,animprovedCCEresourceallocationalgorithmbasedontheCQIandDTXisproposed.ThealgorithmutilizesCQIandDTXtorecorddownlinkchannelSINRandBLER_DTX,anditadaptivelyadjusttheallocationofCCEaggregationlevelbasedonthecomparisonresultofSINR,BLER_DTXandthet
