2019年移动通信与仿真课件.ppt

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1、GPRS-EDGE吴伟民电子与信息工程系wuwmhust.edu2GPRS-EDGEOverviewGPRSServicesNetworkArchitectureUmInterface(MS-Bss)52-MultitrameLogicalChannelsPhysicalChannelGPRSStackLayerSNDCPLLCGPRSenmodeIdleGPRSNetworkmodeClassesdesmobilesMultislotClassSessionManagementEvolutiontoEDGEModulat

2、ionsGPRSvsEDGEEDGE:RLC/MACRLC/MACTBF3GPRS:OverviewWhatisGPRSGeneralBut…onlyapplicabletospecificservicesPacketObviouslyRadioBut…muchmoreServiceBut…ratheratransmissionmethod4GPRS:OverviewCircuitvs.PacketCircuitPacket5GPRS:OverviewGPRSvs.nonGPRSDifferencesbetweenGPRS

3、andGSMWarrantyontrafficWarrantyondelayvs.BesteffortChargingontimevs.chargingonvolumeRadioresourcesharingDedicatedchannelsvs.SharedchannelsTransmissionmodeinthenetworkCircuit64kbpsvs.IPnetworkUserrateupto160kbps6GPRS:OverviewCircuitvs.PacketService(pointtopointprot

4、ocol)GSMallowsbothcircuitandpacketserviceGPRSallowsonlypacketserviceSwitchmodeinthenetworkInMSC,circuitswitchat64kbpsInGPRS,datagramswitchRadiopathtransmissionGSMusearesourceduringthecompletecall(circuit)Butdataarealwaysinpacketformat(burst)7GPRS:OverviewSharedCha

5、nnelsTheequivalentofaTCHisallocatedto16(max)multiplexedflowsPossibletoallocateseveralsuchresourcestooneuser(multi-slot)ReleasethroughtimerIndependenthandlingofdirectionWEBapplicationtrafficisnotsymmetricalLimitationthroughGSMsymmetricalscheme8GPRS:Overview•Locatio

6、nAreaCodeisrelevanttoLA(LocationArea)insideaPLMN.•RoutingAreaCodeisrelevanttoRA(RoutingArea)insideaLA.PLMNALACACellCRACARACBLACBPLMNBCellACellB9IPGPRS:OverviewTCP/IPIP:InternetProtocolToroutedatagram(32bitsaddress)throughinterconnectednetworksegmentationTCP:Transm

7、issionControlProtocolPointtopointtransportTCPUDPNumberingandacknowledgeofdatamultiplexingUDP:UserDatagramProtocolMoresimplethanTCPLocalnetworkprotocol(GPRS)NoacknowledgementUsedforWAP10GPRSNetworkArchitectureGPRSnetworkequipmentRadiosub-systemCCU:ChannelCodecUnitP

8、artoftheBTSmainlyhandlingthephysicallayerPCU:PacketControlUnitHandlesRLCandMAClayersSwitchesSGSN:ServingGPRSSupportNodeGGSN:GatewayGPRSSupportNode11UmIn