WCDMA无线网络规划与优化_m

[e-mail]—2Allrightsreserved©2004ContentsWCDMAFundamentals(includinglinkbudgetfundamentals)RadioResourceUtilizationCoverageandCapacityissuesCelldeploymentWCDMARadioNetworkPlanning(includingWCDMA-GSMCo-planningissues)Co-existingTDD&FDDmodesPresentationTitle—3Allrightsreserved©2004WCDMAFundamentalsWCDMAnetworkinfrastructureWCDMAradiointerfaceprotocolarchitectureWCDMAlinklevelcharacteristics&indicatorsWCDMAlinkbudgetanalysisPresentationTitle—4Allrightsreserved©2004WCDMAFundamentalsWCDMANetworkinfrastructurePresentationTitle—5Allrightsreserved©2004WCDMAFundamentalsWCDMARadioInterfaceprotocolarchitectureRadioResourceControlSublayer(RRC)MediaAccessControlSublayer(MAC)Physicallayer(PHY)PacketDataConvergenceProtocol(PDCP)RadioLinkControlSublayer(RLC)RLCRLCRLCRLCTransportChannelsLogicalChannelsSignallingRadioBearersRadioBearersLayer3Layer2Layer1PresentationTitle—6Allrightsreserved©2004WCDMAFundamentalsMappingbetweenTrchandPHYchannelsTransportChannelsDCHRACHCPCHBCHFACHPCHPhysicalChannelsDedicatedPhysicalDataChannel(DPDCH)DedicatedPhysicalControlChannel(DPCCH)PhysicalRandomAccessChannel(PRACH)PhysicalCommonPacketChannel(PCPCH)CommonPilotChannel(CPICH)PrimaryCommonControlPhysicalChannel(P-CCPCH)SecondaryCommonControlPhysicalChannel(S-CCPCH)SynchronisationChannel(SCH)AcquisitionIndicatorChannel(AICH)AccessPreambleAcquisitionIndicatorChannel(AP-AICH)PagingIndicatorChannel(PICH)CPCHStatusIndicatorChannel(CSICH)Collision-Detection/Channel-AssignmentIndicatorChannel(CD/CA-ICH)DSCHPhysicalDownlinkSharedChannel(PDSCH)HS-DSCH-relatedSharedControlChannel(HS-SCCH)HS-DSCHHighSpeedPhysicalDownlinkSharedChannel(HS-PDSCH)DedicatedPhysicalControlChannel(uplink)forHS-DSCH(HS-DPCCH)PresentationTitle—7Allrightsreserved©2004WCDMAFundamentalsWCDMAlinklevelindicatorsindicatorsFormularizationCommentsBLERAverageblockerrorratecalculatedforthetransportblocksBERInformationbiterrorrateRUserinformationbitrateEb/NoUplink:Downlink:Energyperbitdividedbynoisespectraldensity(includinginterferencepowerdensity)Ec/Io(Eb/No)dividedbyprocessinggainThereceivedchipenergyrelativetothetotalpowerspectraldensity;alwaysusedonCPICH,AICHandPICH.Ec/IorThetransmittedenergyperchiponachosenchannelrelativetothetotaltransmittedpowerspectraldensityatthebasestation.IOther-to-own-cellreceivedpowerratioG(Geometryfactor)Mostlyusedindownlink,GreflectsthedistanceoftheMSfromtheBSantenna.Atypicalrangeisfrom–3dBto20dB,where–3dBisforthecelledge.AveragePowerRiseThedifferencebetweentheaveragetransmittedpowerandtheaveragereceivedpowerinlowmulti-pathdiversitychannelsNoiseRiseTheratioofthetotalreceivedwidebandpowertothenoisepower.PowerControlheadroom(AveragerequiredreceivedEb/IowithoutfastPC)-(averagerequiredreceivedEb/IowithfastPC)Alsoreferredas“TPCheadroom”or“multipathfadingmargin”MacroDiversityCombiningGainThereductionoftherequiredEb/Noperlinkinsoftorsofterhandoverwhencomparedtothesituationwithoneradiolinkonly.IPRWNErxb0NothownrxbPIIPRWNE)1(0ownothIIiNothownPIIGParametersWCDMAChiprate3.84McpsFramelength10or2msModulationDownlink:QPSK;Uplink:HPSKBandwidth5MHzVocoderAlgebraicCodeExcitedLinearPredictionCoder(ACELP)BasesynchronizationAsynchronizationPowercontrolrate1500HzCellidentificationUniquescramblingcode(Goldcode)ChannelizationcodeOVSFcodeWCDMAparametersPresentationTitle—8Allrightsreserved©2004WCDMARadioNetworkPlanning---ExampleoflinkbudgetanalysisRFlinkbudgetcomponents:PresentationTitle—9Allrightsreserved©2004WCDMARadioNetworkPlanning---ExampleoflinkbudgetanalysisAllowedpropagationlossforcellrange[dB]141.9v=r-s+t-uTransmitter(mobile)Max.Txpower[dBm]21aMobileantennagain[dBi]0bBodyloss[dB]3cEquivalentIsotropicRadiatedpower(EIRP)[dBm]18d=a+b-cReceiver(basestation)Thermalnoisedensity[dBm/Hz]-174eBasestationreceivernoisefigure[dB]5fReceivernoisedensity[dBm/Hz]-169g=e+fReceivernoisepower[dBm]-103.2h=g+10*log(3840000)Interferencemargin[dB]3IReceiverinterferencepower[dBm]-103.2j=10*log(10^((h+i)/10)-10^(h/10))Totaleffectvenoise+interference[dBm]-100.2k=10*log(10^(h/10)+10^(j/10))Processinggain[dB]25l=10*log(3840/12.2)RequiredEb/No[dB]5mReceiversensitivity[dBm]-120.2n=m-l+kBasestationantennagain[dBi]18oMax_path_loss=Ptx_EIRP-Prx_receiver_sensitivity-Lrx_cable+Grx_antennaCablelossinthebasestation[dB]2pFastfadingmargin[dB]0qMax.pathloss[dB]154.2r=d-n+o-p-qAllowed_propagation_loss=Max_path_loss-Log_normal_fading_margin+soft_handover_margin-in_car_lossExampleofRLBfor12.2kbpsvoiceservice(uplink,120km/h,in-carusers,VAchannelwithsofthandover)Coverageprobability[%]95Lognormalfadingconstant[dB]7Propagationmodelexponent3.52Lognormalfadingmargin[dB]7.3sSofthandovergain[dB]3tIn-carloss[dB]8u(*)*“modelingtheimpactofthefastpowercontrolontheWCDMAuplink”,sipila,K.,Laiho-Steffens,J.,Jasberg,M.andWacker.A,ProcVTC99’SpringHuston,Texas,May1999pp.1266-1270Aheadroomformobilestationtomaintainadequateclosedloopfastpowercontrol.Thisappliesespeciallytoslow-movingpedestrianmobiles.Typicalvaluesare2.0-5.0dBforslow-movingmobiles