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主要的物理层特征无线接口FDDTDDDL:OrthogonalFrequencyDivisionMultiplexing(OFDM)UL:SingleCarrier–FrequencyDivisionMultipleAccess(SC-FDMA)LongshortCyclicPrefixScaleablebandwidthi.e.differentchannelbandwidthsupported:1.4/3/5/10/15/20MHzDL:upto100MbpsUL:upto50MbpsSub-carrierspacing:15KHz,7.5KHzTwotypesofframestructure多接入多发出(MIMO)Upto4antennasatmobileUpto4antennasatNode-BsiteMACData-modulationschemes:AdaptiveModulationCoding(AMC)DL:QPSK,16-QAM,64-QAMUL:?/2BPSK,QPS,16-QAMTurboconvolutionalcodingFrameduration=10msTransmissionTimeInterval(TTI)=1msH-ARQSchedulerResourceAssignment,RAHungarianassignmentRoundRobinBestusertosub-carrierassignmentBestsub-carriertouserassignmentQualityandprioritybasedresourceassignment(QPRA)ProportionalFairPersistentschedulingSchedulingusersandtheirqueuesprioritiesresourcesradioqualitiesbufferfillingstatusQoSrequirementspresentdelaysResourcesassignedtothedatastreamsaccordingtotherequirements,enablingoptimisedcapacity,whilekeepingtheQoSsignalledoverDLcontrolchannelslastscheduledTTISchedulingListGeneration,SLGRoundRobinWeightedListProportionalFairpowerrestrictionsnumberofusableMIMOstreamsMAC调度User-orientedcriteriaNetwork-orientedcriteriaLTEDL性能-UE吞吐量15MonteCarloUEpercellUpto5schedulableUEperTTICelldistance:500mTheQPRAschedulersometimesassignsallavailableresources(25PRBs)toonesingleUE,thiseffectisvisibleassteps(seeredcurve).Thiscaseoccurs,whenoneUEintheschedulinglistismuchbetterthantheothers.CellThroughputCDF0.00E+001.00E-012.00E-013.00E-014.00E-015.00E-016.00E-017.00E-018.00E-019.00E-011.00E+000.00E+005.00E+031.00E+041.50E+042.00E+042.50E+04RoundRobinQPRASchedulerCellThroughputCDF100%90%80%70%60%50%40%30%20%10%0%RoundRobinQPRA0Mbps5Mbps10Mbps15Mbps20Mb
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