363GPP+LTE系统中基于QoS保证的资源调度研究

华中科技大学硕士学位论文3GPPLTE系统中基于QoS保证的资源调度研究姓名：王喆申请学位级别：硕士专业：通信与信息系统指导教师：朱光喜20090525IQoS3GPPLTEOFDMASC-FDMAOFDMMIMO(AMC)HARQLTEQoSLTEUEVoIPLTER8LTE-AdvancedLTELTER8LTEQoSMACUERBeNB/TCPTCPIPToSTCPRTTTCPLTELTEQoSHappyBitIIAbstractTherapiddevelopmentandintegrationofmobilecommunicationandInternetrequiresthefuturecommunicationsystemforaseriesofdemands,whichbringsdifficultyandchallengestothedesignofthenextgenerationwirelesscommunicationsystem.Asoneofthetypicalcommunicationsystemsinfuture,the3Glongtermevolution(LTE)employsOrthogonalFrequencyDivisionMultiplexing(OFDM),MultipleInputMultipleOutput(MIMO)antenna,AdaptationModulationCoding(AMC),HybridAutomaticRepeatQuest(HARQ)andmanyothertechniques.AllthesetechniquesmaketheRadioResourceManagementmorecomplex,whilethelatterisakeypointonimprovementofthesystemperformanceandQoS.InLTE,thedownlinkscheduleisbasedonRadioBearerwhiletheuplinkonebasedonUE,bothofwhichsupportcommonpacketschedulealgorithmandsemi-persistentscheduleralgorithm(forVoIP).However,therestillexitsomeproblemsanddefects.InordertomeettheperformancerequirementsofLTE-Advancedsysteminfuture,assessmentandimprovementonresourcescheduleisofgreatsignificance.AccordingtoRelease8,inthispaper,LTEresourceschedulemechanismisdeeplystudied.Systemperformanceisassessedthroughschemedesignandsimulationanalysis,andtwomethodsabouttheimprovementofresourcesscheduleareproposed.InMethod1,theuplinkreportscaninformmoredetailsbyutilizingthetworeservedbitsinMACPDUsubheader,thus,foruplinkservices,radioresourceblockscanbeallocatedmorereasonableandthefairnessofmultipleusersbenefits;Method2isadaptivetoTCPconnections,inordertodecreasetheprobabilityofstartingTCPcongestioncontrolmechanism,whichmaycausehigherlatencytotheair-link,TCPACKsareprojectedtoanidlelogicalchannelwithhigherpriorityforbettertransmission.Bythisway,theRoundTripTime(RTT)isdecreasedandtheperformanceofTCPconnectionisenhanced.Thesimulationresultsshowthat,bothofthesetwoproposedschemescanworkwellinLTEdynamicresourceschedulemechanism,withbetterperformanceofQoS.Keywords:LongTermEvolution(LTE),RadioResourceSchedule,Semi-PersistantSchedule,QualityofService,HappyBit111.1LTE1.1.12G3G/3.5G[1]3G/3.5G3G/3.5GISO2Mbps100MbpsEvolved3G1000MbpsBeyond3G[2]4GOrthogonalFrequencyDivisionMultiplex,OFDMMulti-InputMulti-Output,MIMO4G3GAIEAirInterfaceEvolutionLTELongTermEvolutionWiMAXWorldInteroperabilityforMicrowaveAccess4G1.1.2LTEQoS3GCDMA[3]CDMA20043GPPEvolvedUTRAandUTRANLongTermEvolutionLTE2[4]a)3GPPb)3G4Gc)d)CDMA3GLTE[5-6]20041220069200762008LTELTEPlus6LTE-AdvancedLTE3GLTE1.2LTE[7-8]LTEa)VoIPb)MultibroadcastMultimediaserviceMBMSc)1.2520MHzd)50Mbps100Mbpse)5bit/s/Hz2.5bit/s/Hzf)5ms100msg)h)i)j)LTEk)3GPP3GPPl)R6m)n)IPIMSo)31.3LTE1.3.1LTE3GPPLTEE-UTRANeNodeBaGW1-1aGWeNBeNBMME/S-GWMME/S-GWeNBeNBS1S1S1S1X2X2X2E-UTRAN1-1E-UTRANeNBS1MobilityManagementEntity,MMESAESystemArchitectureEvolutioneNBX2[9]a)eNBUEMMEb)MMENASNASMME3GPPc)SAEeNBd)S1S1SAES1NAS4e)X2X21.3.2LTEE-UTRAN1-2[9]1-2E-UTRANE-UTRANMediumAccessControl,MACRadioLinkControl,RLCPacketDataConvergenceProtocol,PDCPE-UTRANU-planeC-planeQoS1-3MACHARQRLCARQPDCP5eNBPHYUEPHYMACRLCMACPDCPPDCPRLC1-3E-UTRAN1-4MACHARQRLCARQPDCPRRCNASSAEeNBPHYUEPHYMACRLCMACMMERLCNASNASRRCRRCPDCPPDCP1-4E-UTRAN1.4LTE1.4.1LTEOFDM/FDMACDMA6OFDM/FDMACDMACPOFDMALTEPAPRLTEDFT-S-OFDMSC-FDMA1.4.2MIMOLTEMIMO2×21×2MIMOMIMOCyclicDelayDiversity,CDD/Space-TimeBlockcodes/Space-FrequenceBlockCodes,STBC/SFBCCDDMIMO1.4.3LTE3GR6TurboLTE3GPP1-171-1LTE64QAMPDSCHPMCHPUSCH16QAMPDSCHPMCHPUSCHQPSKPDSCHPMCHPBCHPCFICHPDCCHPUSCHPUCCHBPSKPHICHPUCCHPSCHSSCHPRACH1.4.4LTEAMCMCSLTEOFDMPhysicalRsourceBlock,PRBPRBMCSTTIMACPDUSC-FDMARUAMC1.4.5LTELTEOFDMA81.4.6LTERLCARQMACHARQHARQNACKHARQHARQLTERLCARQ1.3.2MACRLCeNBUE2HARQARQLTE1.5,QoS[10]LTE9LTER8QoSLTEQoS1.6LTELTELTELTEVoIPBSRUELTER8OPNETLTELTELTEQoSQoSLTE102LTE3GPP/[11]LTE2-1LTE/UE3UE1UE2UE3UE4UE1UE1UE3UE2UE4UE2UE15MHz1.25MHz(MHz)ms=0.5ms20MHz2-1LTE/LTEPRBPRB1.25MHz0.5msLTEPRBPRBPRBPRBLTEVoIP[12]LTEeNBeNB11UERBRadioBearerHARQeNBUEUE--LTER82.2LTE2.3LTEVoIP2.4LTEUE2.52.1[13][14-15]2-12-1QoSQoS19971997LuBharghavaWeightedFairQueuing,WFQIdealizedWirelessFairQueuing,IWFQ[16]IWFQ12IWFQStioicaZhangSTFQ[17]Channel-conditionIndependentpacketFairQueuing,CIF-Q[18]CIF-QIWFQIWFQRamanathanSBFAServerBasedFairApproach[19]SBFAIWFQLuBharghavaWirelessFairService,WFS[20]WFS/HDRHighDataRate[21]CDMA[22]QoS2.2LTELTE1LTEMACRRCLTE4[23]2-213(ms)(MHz)MACRRC(Mbps)MACRRC2-2a)MAC/b)RRC/RRCc)/RRCMACd)RRCMAC/2LTEa)UEeNBUE/UERBRadioBearerb)RBeNBRBQoSLTERBeNBeNBRBRBQoS14LTEUEUEUEUERB3LTEa)b)4LTE2.3LTEQoS[24]a)b)c)QoSd)e)LTEVoIP2.3.1LTE151MaxC/IMaximumCarriertoInterferenceargmax(/)iijCI=(2-1)/iCIijMaxC/IMaxC/I2RoundRobin,RRRR3ProportionalFairnessPF[25-26]2-21()()0()NnnnnRSRPRP=−≤∑(2-2)16()nRPn()nRSSnN(2-3)argmaxiiirjR=(2-3)iriiRiMIMO[27]1maxKkkkrR=∑(2-4)MaxC/IRRPFPF[28][29]QoS4ModifiedLargestWeightedDelayFirstM-LWDF[30]2-5M-LWDFit()()()lg()iiiiiRtDtPtQdTλ=−gg1,2,i=N(2-5)QQoS()iRtitiλi()iDtitiTiM-LWDFPFM-LWDF17M-LWDF2.3.2VoIP1.2LTEVoIPVoIPVoIPVoIPLTEa)PDU1/2UERRCCRCACKNACKb)PDU,1/2UEACKNACK1RRC/a)C-RNTIb)