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1、146JOURNALOFCOMMUNICATIONS,VOL.4,NO.3,APRIL2009TheEvolutionofLTEtowardsIMT-AdvancedStefanParkvallandDavidAstelyEricssonResearch,16480Stockholm,SwedenAbstract—Thispaperprovidesahigh-leveloverviewoffeaturesofLTE,spectrumflexibility,isoutlined.Othersometechnologycompon
2、entscurrentlyconsideredforthetechnologycomponentssuchasmultipleantennaevolutionofLTE,referredtoasLTE-Advanced.First,atransmissionaswellasinter-cellinterferencebriefoverviewofLTEandsomeofitstechnologiesaregivencoordinationarealsoaddressed.Thisisfollowedbyanandthenthe
3、IMT-Advancedrequirementsarediscussed.introductionoftherequirementsontheevolutionofLTE,OneofthetargetswiththeevolutionofLTEistoreachorincludingtheIMT-Advancedrequirements.Finally,somesevensurpasstheserequirements.ThetechnologycomponentsconsideredforLTE-Advancedinclud
4、eextendedpotentialkeytechnologycomponentstofulfillthesespectrumflexibilitytosupportupto100MHzbandwidth,requirements,suchascarrieraggregation,enhancedenhancedmulti-antennasolutionswithuptoeightlayermulti-antennatransmission,coordinatedmulti-pointtransmissioninthedown
5、linkanduptofourlayertransmissionandtheuseofadvancedrepeaters/relaying,transmissionintheuplink,coordinatedmulti-pointarediscussed.transmission/reception,andtheuseofadvancedrepeaters/relaying.II.LTE–ANOVERVIEWIndexTerms—LTE,IMT-Advanced,LTE-Advanced,4GTosetthebackgrou
6、ndforLTE-Advanced,itisnecessarytobrieflydescribetheexistingLTEsystem,knownasLTERel-8.Inthefollowing,abriefoverviewofI.INTRODUCTIONthefirstreleaseofLTEisgiven.TheLTEasdefinedby3GPPisahighlyflexibleradioA.BasicTransmissionSchemeinterface[1][2]withinitialdeploymentsexp
7、ectedinOrthogonalfrequency-divisionmultiplexing(OFDM),2009.ThefirstreleaseofLTE,referredtoasrelease-8withdatabeingtransmittedonalargenumberofparallelprovidespeakratesof300Mbit/s,aradio-networkdelaynarrow-bandsubcarriers,isthecoreoftheLTEdownlinkoflessthan5ms,asignif
8、icantincreaseinspectrumradiotransmission.Duetotheuseofrelativelynarrow-efficiencyandanewflatradio-networkarchitecturebandsubcarriersincomb
