EDGE原理简介

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1、EDGE基本原理简介目录EDGE简介EDGE与GPRS的关系EDGE无线调制介绍EDGE关键技术EDGE性能EDGE简介WHATisEDGEEnhancedDataratesforGSMEvolutionThismeans…Abiggerpipeforstufftogoacrossthe2GNetwork!!InthebeggingitwasbeenliketryingtoshiftanelephantintermsofutilisationoffacrossthematurenetworksEDGEbrings3GtoGSMstandardAve.4,4t

2、imeshigherGPRScapacityanddatauserratesAve.150-200kbpsGPRSdatarates(C/I=18dB,4TSLMS)Max.473GPRSkbpsdatarateperuserUpto5,7timeshighercapacityanddataratescomparedtoGPRSLateronabove2Mbps(rel5/6)EGPRSandvoicecallsimultaneouslyDualTransferModeEDGEImprovementAreasThreeadvancedtechniquesin

3、theradiolinkthatallowEDGEtoachieveextremelyhighspectralefficiencyfornarrowband(<100Kbps)cellular-dataservices.OctonaryPhaseShiftKeying(8-PSK):allowstheradiosignaltotransmitthreebitsofinformationineachradiosimbolMultiplecodingschemes:thenetworkcanadjustthenumberofbitsdedicatedtoerro

4、rcontrolbasedontheradioenvironment.Incrementalredundancy:ifblocksofdataarereceivedinerror,EDGEsendsanincrementalamountoferror-correctingdataineachretransmissionmorelikelytosucceedthanthepriorone.EDGE与GPRS的关系EGDEImpactofonexistingGSM/GPRSnetworks-1EDGEisanaddontoGPRSnetwork(newmodul

5、ationtechniqueandchanneldatacoding)andcannotworkalone.GPRSandEGPRShavedifferentprotocolsanddifferentbehavioronthebasestationsystemwide.EGDEImpactofonexistingGSM/GPRSnetworks-2Softwareupgradesinthebasestationsystemenableuseofthenewprotocol.Theprotocolsthatareinfluencedbytheintroduct

6、ionofEDGEaretheoneclosesttothephysicallayer(radiolinkcontrolandmobileallocationchannel).NewtransceiverunitsinthebasestationenableuseofthenewmodulationtechniqueEGDEImpactofonexistingGSM/GPRSnetworks-3ThearealsoimpactonMobilityManagement:EGPRSmultislotclass8PSKpowerclassAndRadioResou

7、rceManagement:supportforsettingupandmaintainingEGPRStemporaryblockflows(8PSK,IR)signalingsupportingtheRLClinkqualitycontrolandmeasurementproceduresEGDEImpactofonexistingGSM/GPRSnetworks-4TherearealsosomeminormodificationtothebasestationsystemGPRSprotocol.Alltherestoftheprotocolstac

8、kremainthesame.PhysicalLay