LTEoverview

LTE/EPSOverview●GuanLei●19-12-2014LTEUnpairedFrequencyBandsin3GPP(TDD)33343536373940381x201x601x151x201x401x601x1001x501910-19301850-19102010-20251900-19201880-19201930-19602300-24002570-2620Total[MHz]Uplinkanddownlink[MHz]US1900ULUMTSTDD2300US1900DLUMTSTDD1UMTSTDD2US19002600Band3GPPNameRequirement:LatencyandSignalPerformanceUserPlaneLatencycellGatewayIPNetwork5ms(unloadedcondition)ControlPlaneLatencyIDLE(noresources)ACTIVE100msNoresourceResourceAllocated50msEvolvedPacketSystem(EPS)Architecture-Subsystems•TheEPSarchitecturegoalistooptimizethesystemforpacketdatatransfer.•Therearenocircuitswitchedcomponents.TheEPSarchitectureismadeupof:–EPC:EvolvedPacketCore,alsoreferredasSAE–eUTRAN:RadioAccessNetwork,alsoreferredasLTELTEoreUTRANSAEorEPC•EPCprovidesaccesstoexternalpacketIPnetworksandperformsanumberofCNrelatedfunctions(e.g.QoS,security,mobilityandterminalcontextmanagement)foridleandactiveterminals•eUTRANperformsallradiointerfacerelatedfunctionsEPSArchitectureFDDandTDDArchitectureHarmonisation:NodifferencebetweenFDDandTDDmoderegardingthenetworkarchitecture!LTE/SAENetworkElementsMainreferencestoarchitecturein3GPPspecs.:TS23.401,TS23.402,TS36.300NOTE:Interfacenamesarefromdraftspecificationandmaynotbethefinalinterfacenames.LTE-UEEvolvedUTRAN(E-UTRAN)MMES10S6aServingGatewayS1-US11PDNGatewayPDNEvolvedPacketCore(EPC)PCRFS7Rx+SGiS5/S8EvolvedNodeB(eNB)X2LTE-UuHSSMobilityManagementEntityPolicy&ChargingRuleFunctionSAEGatewayeNBLTE/SAERoamingArchitectureS6aHSSHomePLMNhPLMNEvolvedUTRAN(E-UTRAN)EvolvedPacketCore(EPC)MMEServingGatewayS1-US11S1-MMEEvolvedNodeB(eNB)cellLTE-UuVisitedPLMNvPLMNPDNGatewayIMS/PDNvPCRFGxRx+SGiS5hPCRFS9LTE/EPSInterworkingwith2G/3GNetworksLTE-UEEvolvedUTRAN(E-UTRAN)EvolvedPacketCore(EPC)MMES6aServingGatewayS1-US11S1-MMEPDNGatewayPDNPCRFGxRx+SGiS5/S8HSSSGSNS3UTRANIu-PSS4EvolvedNodeB(eNB)cellLTE-UuGERANGbS6d:diameterBasedGr:MAPBasedGGSNGnPDNGiNSNNetworkArchitectureEvolution-SummaryNodeBRNCSGSNGGSNInternet3GPPRel6/HSPADirecttunnel3GPPRel7/HSPAInternetNodeBRNCSGSNGGSNDirecttunnel3GPPRel7/InternetHSPAInternetNodeBSGSNGGSNNodeB(RNCFunct.)Directtunnel3GPPRel8/LTEInternetEvolvedNodeBMMESAEGWTDMAftf•TimeDivisionFDMAfft•FrequencyDivisionCDMAftf•CodeDivisionOFDMAfft•FrequencyDivision•OrthogonalsubcarriersMultipleAccessMethodsUser1User2User3User..OFDMisthestate-of-the-artandmostefficientandrobustairinterfaceLTEFDDandTDDModesUplinkDownlinkBandwidthupto20MHzDuplexFrequencyftBandwidthupto20MHzGuardPeriodftUplinkDownlinkBandwidthupto20MHzGUTI:•GloballyUniqueTemporaryIdentity•ItisdynamicallyallocatedbytheservingMME•ItsmainpurposeistoavoidusageofIMSIonair•InternallytheallocatingMMEcantranslateGUTIintoIMSIandviceversa•TheGUTIconsistsof2components:GUMMEIandM-TMSIUEIdentification:GUTIGUTIM-TMSIGUMMEIM-TMSI:TemporaryIdentityoftheUEwithinandspecificMME.GUMMEI:GlobalUniqueMMEIdentity:IdentityoftheMMEthatallocatedtheGUTIItContains:MCC+MNC+MMEgroupID(MMEGI)+MMECode(MMEC)FurtherReading:S-TMSIS-TMSI:•TheSAETMSI(S-TMSI)isashortenedformoftheGUTI•ItisusedtoidentifytheUEovertheradiopathandisincludedintheRRCconnectionrequestandpagingmessages•TheS-TMSIcontainstheMMECandM-TMSIcomponentsoftheGUTI•Note,however,thattheS-TMSIdoesnotincludetheMMEGI—thatis,theMMEpoolcomponentM-TMSIMMECGUMMEIMMEGIMNCMCCGUTIS-TMSIEPSMobilityManagement(EMM)statesEMMderegisteredEMMregisteredAttachDetachEPSConnectionManagement(ECM)andLTERadioResourceControl(RRC)States•UEandMMEenterECM-CONNECTEDstatewhenthesignallingconnectionisestablishedbetweenUEandMME•UEandE-UTRANenterRRC-CONNECTEDstatewhenthesignallingconnectionisestablishedbetweenUEandE-UTRANECMidleECMconnectedS1connectionestablishmentS1connectionreleaseRRCidleRRCconnectedRRCconnectionestablishmentRRCconnectionreleaseE-UTRANMMEUEEPSConnectionManagementECMConnected=RRCConnected+S1ConnectioneNBMMEUERRCConnectionS1ConnectionECMConnected3Gvs.SAEBearersQoSAttributesComparison•Asinglescalarparameter(QoSClassIdentifier=QCI)isapointertoasetofQoSparameters.•QCIisalsocalledLabelinLTE.•Simplifiedapproachcomparedto2G/3Gwhereeachparameterisindicatedseparately.3GLTE/EPSResidualBERSDUerrorrateDeliveryoferroneousSDUsMaxSDUsizeDeliveryorderTransferdelayARPTrafficclassTraffichandlingpriorityMaxbitrateGuaranteedbitrateQCIARPMBRGBRAMBRPerbearerPerterminalUL/DLTFTQoSClassIdentifier(QCI)Tablein3GPPGBR1GuaranteeDelaybudgetLossrateApplicationQCIGBR100ms1e-2VoIP2GBR150ms1e-3Videocall3GBR300ms1e-6Streaming4Non-GBR100ms1e-6IMSsignalling5Non-GBR100ms1e-3Interactivegaming6Non-GBR300ms1e-6TCPprotocols:browsing,email,filedownload7Non-GBR300ms1e-68Non-GBR300ms1e-69Priority2451768950ms1e-3Realtimegaming3MMEHSSPCRFUEeNBnewMMEServingGateway(SGW)PDNGatewayAttachRequestIMSI/oldGUTI,oldTAI,oldGUMMEI,oldECGIAuthenticationRequestAuthenticationResponseUpdateLocation(ME&MMECapabilities,IMEI,UpdateType)AuthenticationVectorRequest(IMSI)InsertSubscriberData(subscriptiondata=defaultAPN,subscriberAMBRInsertSubscriberDataAckUpdateLocationAckEMM_DeregisteredAttach(1/2)AuthenticationVectorResponseRRC_ConnectedECM_ConnectedDefaultbearerQOSprofile,TArestric