3G无线通信技术(1)

3G無線通信技術2010.09.16Agenda•IntroductiontoUMTSSection1Historyof3GSection2UMTSnetworkstructureSection3UMTSnetworkservices•UTRANBasicPrinciplesIntroductiontoUMTSSection1Historyof3G–Section2UMTSnetworkstructure–Section3UMTSnetworkservicesDevelopmentofMobilecommunicationHistoryof3G•At1985:ITUstartedtheprocessofdefiningthestandardforthirdgenerationsystems,referredtoasInternationalMobileTelecommunications2000(IMT-2000)•SomeofthefeaturesthatIMT-20003Gnetworkmustinclude1-Circuitandpacketorientedservices2-Simultaneousmultipleservices3-SymmetricalandAsymmetricalservices4-Migrationpathfrom2Gsystems5-SupportingMultimediaservicesCarspeedenvironment:144kbpsWalkspeedenvironment:384kbpsIndoorenvironment:2048kbps•1992:230MHzspectrumwasallocatedin2GHzband(WARC92)Historyof3G•BasedontheIMT-2000performanceobjectivesandfrequencyallocationtheITU-RformallyrequestedasubmissionofRTTproposalswithaclosingdateattheendofJuly1998.•Bytheclosingdate,therewereatotalof10RTTproposalsweresubmittedfromEurope,Unitedstates,Japan,Koreaand,China.Alltheseproposalwhereaccepted.•FiveRTTforIMT2000•WCDMAFDD•CDMA2000(1X-EV-DOand3Xmodes)•WCDMA-TDD•UWC-136(basedonD-AMPS)•DECT•Onlythree3Gnetworkimplementedandcurrentlydeployed1-CDMA2000(1X-EV-DO)2-WCDMAFDD(UMTSFDD)3-WCDMATDD(UMTSTDD)3Gstandardizationorganizations•Standardizationorganizationssuchas3GPP,3GPP2wereestablished3GPP標準化的里程碑UMTSFDDandTDDIntroductiontoUMTS–Section1Historyof3GSection2UMTSnetworkstructure–Section3UMTSnetworkservices3GPPR99networkArchitecture3GPPR4networkArchitectureDifferencebetweenR99andR4IntroductiontoUMTS–Section1Historyof3G--Section2UMTSnetworkstructureSection3UMTSnetworkservicesQoSofDifferentServicesTimedelayQuality(BER)backgroundconversationalstreaminginteractiveUMTSservicesAgenda•IntroductiontoUMTSSection1Historyof3GSection2UMTSnetworkstructureSection3UMTSnetworkservices•UTRANBasicPrinciplesMultipleAccessTechniquesMultipleAccessTechniquesMultipleAccessTechniquesRakeReceiverRakereceiverWCDMAhandovertypes•SofterHandoverUEisconnectedsimultaneouslytotwosectorsofonebasestationusingthesamefrequencyTheUEreceivesthedownlinktransmissionsthetwosectors.ForthispurposeithastoemployoneofitsRAKEreceiverfingersforeachreceivedsignal.intheuplinkdirection,thecodechannelofthemobilestationisreceivedineachsector,thenroutedtothesamebasebandRakereceiverandthemaximalratiocombinedthereintheusualway.WCDMAhandovertypes•HardHandoverTheUEstopstransmissionononefrequencybeforeitmovestoanotherfrequencyandstartstransmittingagainDuringHardHandovertheusedradiofrequency(RF)oftheUEchangesSpreadingprocessinWCDMA•1stStep:ChannelizationVariableRateSpreading(Accordingtouserdatarate)•2ndStep:ScramblingCodeFixedRateSpreading(3,840Kchips)SChannelizationCodeScramblingCode3,840KcpsCoding&InterleavingSpreadingprocessinWCDMA•Downlink(NodeBtoUE)ScramblingCode:Identifiescell(sector).ChannelizationCode:Identifiesuserchannelsincell(Sector).ScramblingCodeAScramblingCodeBScramblingCodeCChannelizationCode1ChannelizationCode2ChannelizationCode3ChannelizationCode1ChannelizationCode2ChannelizationCode2ChannelizationCode1SpreadingprocessinWCDMA•UpLink(UEtoNodeB)ScramblingCode:Identifiesuserterminal.ChannelizationCode:Identifieschannelsinuserterminal.ScramblingCodeAScramblingCodeBScramblingCodeCChannelizationCode1ChannelizationCode2ChannelizationCode1ChannelizationCode1SpreadingprocessinWCDMA•OrthogonalVariableSpreadingFactor[OVSF]codesarethechannelizationcodesusedforsignalspreadingintheuplinkanddownlinkW-CDMA(IMT-DS)SpecificationMultipleaccessmethodDS-CDMA(DS:DirectSpread)DuplexingmethodFDD/TDD(FrequencyDivisionDuplex/TimeDivisionDuplex)Inter-cellsynchronizationAsynchronousBandwidth5MHZChiprate3.84McpsCarrierspacingFlexiblewith100/200kHzcarrierrasterFramelengthUnit10msDatamodulationDownlink:QPSK,Uplink:BPSKMulti-rateconceptVariablespreadingfactorand/ormulti-codeMaximumdatarate2Mbps(indoor)/384kbps(mobile)ChannelcodingConvolutionalcoding(R=1/3or1/2,K=9)TurbocodeforHighdatarateBPSK:BinaryphaseshiftkeyingQPSK:QuadraturephaseshiftkeyingUMTSFDDfrequencyallocationsOperatingBandULFrequenciesUEtransmit,NodeBreceiveDLfrequenciesUEreceive,NodeBtransmitI1920–1980MHz2110–2170MHzII1850–1910MHz1930–1990MHzIII1710-1785MHz1805-1880MHzIV1710-1755MHz2110-2155MHzV824–849MHz869-894MHzVI830-840MHz875-885MHzThanks!