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1、PARKVALLLAYOUT1/19/113:31PMPage84IMT-ADVANCEDANDNEXT-GENERATIONMOBILENETWORKSEvolutionofLTEtowardIMT-AdvancedStefanParkvall,AndersFuruskär,andErikDahlman,EricssonResearchABSTRACTnationalMobileTelecommunications(IMT)-AdvancedasdefinedbytheInternationalThisarticleprovidesahi
2、gh-leveloverviewofTelecommunicationUnion(ITU)[3,4].TheLTERelease10,sometimesreferredtoasLTE-relationtoIMT-AdvancedisalsothereasonforAdvanced.First,abriefoverviewofthefirstthelabelLTE-AdvancedsometimesgiventoreleaseofLTEandsomeofitstechnologycom-LTERelease10andbeyond.ponent
3、sisgiven,followedbyadiscussionontheThisarticleprovidesabriefoverviewofLTEIMT-Advancedrequirements.ThetechnologyRelease8/9andashortintroductiontotheIMT-enhancementsintroducedtoLTEinRelease10,Advancedwork.Followingthisbackground,thecarrieraggregation,improvedmulti-antennaext
4、ensionsintroducedinRelease10aresupport,relaying,andimprovedsupportforhet-described.Thearticleisconcludedwithresultserogeneousdeployments,aredescribed.Thefromsystem-levelevaluationsshowingthatLTEarticleisconcludedwithsimulationresults,Release10canfulfillandevensurpasstheIMT
5、-showingthatLTERelease10fulfillsandevenAdvancedrequirements.surpassestherequirementsforIMT-Advanced.OVERVIEWOFLTERELEASE8INTRODUCTIONLTEisanorthogonalfrequency-divisionmulti-Deploymentoffourth-generation(4G)mobile-plexing(OFDM)-basedradioaccesstechnology,broadbandsystemsba
6、sedonthehighlyflexiblewithconventionalOFDMonthedownlinkandLongTermEvolution(LTE)radioaccesstech-discreteFouriertransformspreadOFDMnology[1,2]definedbytheThirdGeneration(DFTS-OFDM)[1]ontheuplink.DFTS-OFDMPartnershipProject(3GPP)iscurrentlyongoingallowsformoreefficientpower-
7、amplifieropera-onabroadscale,withthefirstsystemsalreadytion,thusprovidingtheopportunityforreducedbeinginfullcommercialoperation.Thesesys-terminalpowerconsumption.Atthesametime,temsarebasedonthefirstreleaseofLTE,3GPPequalizationofthereceivedsignalisstraightfor-Release8,whic
8、hwasfinalizedin2008.ReleasewardwithconventionalOFDM.Theuseof8canprovidedownlinkanduplinkp
