移动通信与仿真2-GPRS.ppt

GPRS-EDGE,吴伟民电子与信息工程系wuwm,2,GPRS-EDGEOverviewGPRSServices,NetworkArchitectureUmInterface(MS-Bss)52-MultitrameLogicalChannelsPhysicalChannelGPRSStackLayerSNDCPLLC,GPRSenmodeIdleGPRSNetworkmodeClassesdesmobilesMultislotClassSessionManagementEvolutiontoEDGEModulationsGPRSvsEDGEEDGE:RLC/MAC,RLC/MACTBF,3,GPRS:Overview,WhatisGPRS,General,Butonlyapplicabletospecificservices,Packet,Obviously,Radio,Butmuchmore,Service,Butratheratransmissionmethod,4,GPRS:Overview,Circuitvs.Packet,Circuit,Packet,5,GPRS:Overview,GPRSvs.nonGPRS,DifferencesbetweenGPRSandGSM,Warrantyontraffic,Warrantyondelayvs.Besteffort,Chargingontimevs.chargingonvolume,Radioresourcesharing,Dedicatedchannelsvs.Sharedchannels,Transmissionmodeinthenetwork,Circuit64kbpsvs.IPnetworkUserrateupto160kbps,6,GPRS:Overview,Circuitvs.Packet,Service(pointtopointprotocol),GSMallowsbothcircuitandpacketserviceGPRSallowsonlypacketservice,Switchmodeinthenetwork,InMSC,circuitswitchat64kbpsInGPRS,datagramswitch,Radiopathtransmission,GSMusearesourceduringthecompletecall(circuit)Butdataarealwaysinpacketformat(burst),7,GPRS:Overview,SharedChannels,TheequivalentofaTCHisallocatedto16(max)multiplexedflows,Possibletoallocateseveralsuchresourcestooneuser(multi-slot),Releasethroughtimer,Independenthandlingofdirection,WEBapplicationtrafficisnotsymmetricalLimitationthroughGSMsymmetricalscheme,8,GPRS:OverviewLocationAreaCodeisrelevanttoLA(LocationArea)insideaPLMN.RoutingAreaCodeisrelevanttoRA(RoutingArea)insideaLA.,PLMNALACACellCRACA,RACB,LACB,PLMNB,CellA,CellB,9,IP,GPRS:OverviewTCP/IPIP:InternetProtocol,Toroutedatagram(32bitsaddress)throughinterconnectednetworksegmentationTCP:TransmissionControlProtocolPointtopointtransport,TCP,UDP,NumberingandacknowledgeofdatamultiplexingUDP:UserDatagramProtocolMoresimplethanTCP,Localnetworkprotocol(GPRS),NoacknowledgementUsedforWAP,10,GPRSNetworkArchitecture,GPRSnetworkequipment,Radiosub-system,CCU:ChannelCodecUnit,PartoftheBTSmainlyhandlingthephysicallayer,PCU:PacketControlUnit,HandlesRLCandMAClayers,Switches,SGSN:ServingGPRSSupportNodeGGSN:GatewayGPRSSupportNode,11,UmInterface(MS-BSS)MMSub-LayerLLC,RR-SAP,GMMRR-SAP,GRR-SAPRRManagement,Non-RR,PD,RR,RR,UpperLayerPDUsRLC/MAC,SAPI0,SAPI3,PBCCH,PCCCH,PACCH,PDTCH,BCCH,RACHPCHSDCCHAGCH,SACCH,FACCH,SDCCH,SACCH,DataLinkLayer(signallingL2)PDCHPHYSICALLINKLAYER,12,52Multi-TrameTDMAFrame:SameasGSMtechnologyNewformat:Multi-frame52(PDCH:PacketDataChannel)1Block(4framesincontinue),B0,B1,B2,X,B3,B4,B5,X,B6,B7,B8,X,B9,B10,B11,X,52multiframe(duration240ms)Bn:BlocksX:Idleframes,13,LogicalChannelsPBCCH:PacketBroadcastCommonChannelPCCCH:PacketCommonControlChannelPAGCH:PacketAccessGrantChannel,PPCH:,PacketPagingChannel,PRACH:PacketRandomAccessChannelPDTCH:PacketDataTransferChannelPACCH:PacketAssociatedControlChannelPTCCH:PacketTimingadvanceControlChannel,14,LogicalChannels,PBCCH+PCCCH+PDTCH+PACCH+PTCCH+PRACH,PCCCH+PDTCH+PACCH+PTCCH,PDTCH+PACCH+PTCCH,15,LogicalChannels,SharedChannelsLogicalchannels,PDTCH(PacketDataTrafficChannel)andPACCH(PacketAssociatedControlChannel),Toconveyuserandsignallingdata,Multiplexedbetween16(orless)usersUnidirectional(ULorDL),PTCCH(PacketTimingadvanceControlChannel),Tomanagetimingadvance,Dividedinto16bi-directionalchannelsFixedallocation,16,LogicalChannels,CommonLogicalChannels(optional),PBCCH:trnasmitsnetworkdescription(Packet,SystemInformationTypex),PCCCH,PPCH:equivalenttoPCH,PAGCH:equivalenttoAGCH,PRACH:equivalenttoRACH(upto11bits),17,PhysicalChannel,SharedChannelsPhysicalchannels,PDCH(PacketDataChannel)isaphysicalchannelPDCHisbasedononefrequencyandonetimeslotLogicalchannelsaremappedontophysicalchannelsPDCHisorganizedintoblocksof4consecutivebursts,18,TBF:TemporaryBlockFlow,3GPP44.060Definition:,ATemporaryBlockFlow(TBF)isaconnectionusedbythetwoRRentitiesto,supporttheunidirectional,transferofupperlayerPDUsonpacketdata,physicalchannels(PDCH),19,GPRSStackLayersUserPlaneGPRS:Application,Appli,ControlPlaneGPRS:ControlL3,IP-X25SNDCPLLCRLCMACL1PDTCHTBF-User,PDTCHTBF-Control,SM|GSMSGMMLLCRLCMACL1,ControlPlaneGPRSGRRRLCMACL1PBCCH/PCCCHPRACHPACCH/PTCCH,B0,B1,B2,X,B3,B4,B5,X,B6,B7,B8,X,B9,B10,B11,X,52multiframe(duration240ms),20,GPRSUserPlane,21,GPRSControlPlane,22,GPRSControlPlane,23,GPRSSNDCPOverviewMultiplexingofseveralPDPsBetweenMSandSGSN:NSAPISequencingwarrantyforeachPDPAccesstoLLCthroughseveralQoSprofilesSegmentation/Re-assemblyCompressionIPheaderData,MS:SNDCP,SGSN:SNDCP,24,GPRSMSIDENTITY,MSidentities,IMSI:8bytes,Uniqueidentity,StoredintheSIMcard,P-TMSI(PacketTemporaryMobileSubscriberIdentity):4bytes,SimilartoTMSI,UsedtoavoidsendingIMSIAllocatedwithinaRA,TLLI(TemporaryLogicalLinkIdentity):4bytes,UsedbyRLC/MAClayersDerivedfromP-TMSI,P-TMSIsignature:3bytes,Usedtoskipauthenticationprocedure,25,GPRSMSIDENTITYTLLI:TemporaryLogicalLinkIdentifierAllocatedbySGSNUsingP-TMSITLLI,LLC,LLEx:SAPIxLLEz:SAPIz,LLC,LLEx:SAPIxLLEz:SAPIz,LLEy:SAPIy,MS,LLEy:SAPIy,SGSN,DLCIx(DataLinkConnectionIdentifier)TLLI+SAPI,26,GPRSMSIDENTITY,TLLIhandling,GMMgeneratestheTLLI,GMMsendstheTLLItoRLC/MAC,LLCandL3RR,RandomTLLI,UsedincasenoP-TMSIisavailableIdentifier+Randombits,ForeignTLLI,UsedincaseP-TMSIisavailablebutassignedinadifferentRAIdentifier+BitsderivedfromtheP-TMSI,LocalTLLI,UsedincaseP-TMSIisavailableandassignedinthisRAIdentifier+BitsderivedfromtheP-TMSI,27,GPRSLLCAddressField,PDC/RX,X,SAPI,PD:ProtolcoleDiscriminator,LLC=0,Other=InvalidC/R=Command/Response,SAPI:,0001:GPRSMobilityMgt:LLGMM0010:TunnellingofMsg2:TOM20011:UserData3:LL30101:UserData5:LL50111:SMS1000:TunnellingofMsg8:TOM81001:UserData9:LL91011:UserData11:LL11,28,GPRSLLC3ModesLLC,ProtectedModeCRC-24bitsHeader+Data,UnprotectedModeCRC-24bitsHeader,AcknowledgedModeErr.FramesSGSN,TOM,SNDCP,GMM,SMS,TOM,SNDCP,GMM,SMS,LLC,LLC,RLCMACGSMRF,RLCMACGSMRF,BSSGPNetw.Serv.L1,BSSGPNetw.Serv.L1,MS,Um,BSS,Gb,29,1,1,1,1,0,1,GPRSLLCControlFieldAAcknoledgementRequestbitEEncryptionfunctionbit,8,7,6,5,4,3,2,1,MnUnnumburedfunctionbit,Iformat(I+S),0,AXN(S),X,N(S),N(R),N(R)TransmitterreceivesequencenbrN(S)Transmittersendsequencenumber,N(R),S1,S2,N(U)Transmitterunconfirmedsequence,Sformat,1,0,A,XN(R),X,N(R)S1,S2,numberP/FPollBitwhenissuedasCommandFinalBitwhenissuedasResponse,UIformatUformat,XXN(U)N(U)EPMP/FM4M3M2M1,PMProtectedModeBitSnSupervisoryfunctionbitXSpareBit,30,GPRSLLC,ControlField,80,7A,6X,5,4,3N(S),2,1,1,N(S),X,N(R),2,N(R),1,1,3,X,X,X,K,4,Iframe,R(1)R(2)R(3)R(4)R(5)R(6)R(7)R(8),SACKformat,R(9)R(10)R(11)R(12)R(13).,.R(16),.,.,.,.,R(253)R(254)R(255),X36(max),1,0,A,X,X,N(R),1,N(R),1,1,2,SframeSACKformat,R(1)R(2)R(3)R(4)R(5)R(6)R(7)R(8)R(9)R(10)R(11)R(12)R(13).R(16),.,.,.,.,R(253)R(254)R(255),X34(max),31,GPRSRLC/MACManagementofTBFs(TemporaryBlocksFlows)ManagementofLogicalChannelsTBFhasoneTFI,UnidirectionnalIdentityallocatedbynetworkCodingScheme:,CS1CS2CS3CS4,BlockSize:22octets,9kbit/sBlockSize:32octets,13.4kbits/sBlockSize:38octets,15.6kbits/sBlockSize:52octets,21.4kbits/s,CS1,Userdata,Protection,CS2CS3CS4,32,GPRSRLC/MACTBFStandsforTemporaryBlockFlow“Channel”allocatedbetweentheMSandtheBSStoconveydataUnidirectional(UplinkorDownlink)Releasethroughtimer,MS,TBF1TBF1,TBF2,TBF2,BSS,33,GPRSRLC/MAC:UplinkTBF3ModesforTBFUplinkAllocationStaticAllocation:abitmapissenttoMSduring,TBFestablishment(1TS,1USF),DynamicAllocation:MSsends1to4BlocksonreceptionUSFFlagfromNetworkExtendedDynamicAllocation:MSsends1to4BlocksonreceptionUSFFlagfromNetwork,Butfrom1toNPDCHs,mandatoryinMultiSlot2TypesofTBFUplinkEstablishment1phaseaccess2phasesaccess:mandatoryformultislotuplinktransfer,34,GPRSRLC/MAC:HeaderofUplinkDataBlock,PayloadType:,00RLC/MACDataBlock01RLC/MACControlBlock,CountdownValue,TFI:TemporaryFlowIdentity,BSN:BlockSequenceNumber,couldbeacknowledgedbynetwork,InsendingPacketUplinkAck/Nackmessage(includingBSN(s)ACK-NACK),TLLI(optional),35,GPRSRLC/MAC:HeaderofUplinkDataBlockCountdownProcedureUsedbytheMStoannouncetheendoftheTBFBS_CV_MAX(SeeSI13)indicateswhentheCountdownProcedureshallbestartedWhileremainingRLC/MACblocksBS_CV_MAX,CV=15,IfremainingRLC/MACblocksBS_CV_MAXCV=remainingRLC/MACblocks-1LastRLC/MACblocksentwithCV=0TwoRLC/MACblockssentwithsameCViftwoULtimeslotsareallocatedtotheMSResourcerequestisnotpossibleduringCountdownProcedureNewRLC/MACblocksNewTBF,36,GPRSRLC/MAC:HeaderofDownlinkDataBlock,PayloadType,S/PandRRBP:NWrequirestoMSforsending,PacketControlAcknowledgementcontrolmessage,TFI:TemporaryFlowIdentity,BSN:BlockSequenceNumber,couldbeacknowledgedbymobile,InsendingPacketDownlinkAck/Nackmessage(includingBSN(s)ACK-NACK),USF:UplinkStateFlag,37,GPRSRLC/MAC:HeaderofDownlinkDataBlock,UplinkStateFlag,UsedtomultiplexseveralusersonthesamePDCH,USFassignedtotheMSduringtheassignmentprocedureUSFpresentineachDLRLC/MACblock,USFoftheMSpresentwithinDLRLC/MACblock,TheMScansendanULRLC/MACblockatnextoccurrence,TheMSsendsoneorfourULRLC/MACblockdependingonUSFGRANULARITY,USFisallocatedonatimeslotbasis,TheMSneedstomonitoreveryallocatedtimeslot,USF=7reservedforPRACH,38,GPRSRLC/MAC:HeaderofDownlinkDataBlockUplinkStateFlagMS1isassignedUSF1MS2isassignedUSF2DOWNLINK,USF7,USF7,USF1,USF2,USF1,USF7,USF1,USF2,USF7,UPLINK,MS1MS2,BSN,BSN,BSN,BSN,BSN,39,GPRSRLC/MAC:HeaderofControlBlock,Uplink,PayloadType,Downlink,PayloadType,S/PandRRBP:NWrequirestoMSforsending,PacketControlAcknowledgementcontrolmessage,TFI(Optional):TemporaryFlowIdentity,USF:UplinkStateFlag,40,GPRSNetworkMode,NetworkModeofOperation(NMObroadcastedwithinSI13),NMO2:noco-ordination,Doubleregistration,LocationUpdatingANDAttachorRAUIMSIDetachANDGPRSDetach,NoPagingco-ordination,ImpossibletoreceiveaCSPagingduringaGPRStransfer,NMO1:co-ordination,Singleregistration,Combinedprocedures,Pagingco-ordination,CSPagingaresentonPACCHduringaGPRStransfer,41,ClassestheMobiles,MSclass,ClassA,Mobileregisteredinbothmodes,Abletoperformbothoperationssimultaneously(GSMcall+Retrieveanemail),Technicallyverydifficult(2radiosneeded),ClassB,Mobileregisteredinbothmodes,Onlyoneserviceatonetime(eithercallORemail)PriorityforGSM,ClassC,Mobileregisteredinonemode(GSMorGPRS),42,GPRS:MultiSlotClass,43,SessionManagementOverviewUsedtomanagePDPcontextsActivationDeactivationModificationPDPcontext:logicalassociationbetweenaMSandPDN(PublicDataNetwork)runningacrossaGPRSnetworkThePDPcontextdefinesaspectssuchas:Routing,QoSSecurity,PDP1/APN1,PDP1/APN1,Billing,PDP2/APN2,PDP2/APN2,Etc,44,EDGE,EnhancedDataratesforGSMEvolutionAppearedinRelease99,IncreasedatarateonairinterfaceRatecanbemultipliedby3,IRHARQAMCImportantmodificationrelatedtosignalprocessingFewmodificationswithinRLC/MAC(IncreaseARQwindowsize,CompressedACK)LLCandSNDCP:sameasGPRS,45,ModulationGPRSvsEDGE,GMSKVs.8PSK,GMSK:GaussianMinimumShiftKeying,1bitontoonesymbol,8PSK:8PhaseShiftKeying,3bitsontoonesymbol,Transferrate*3,46,ModulationGPRSvsEDGE,ReduceddecisionintervalandthereforemoreaffectedbynoiseNeedrobustr