■LTE系统全网信令流程IntroductionAsanewwirelessmobilecommunicationtechnology,LTE(LongTermEvolution)provideallkindsofservicesthroughnetworkaccessprocedures.SowhenyouaretryingtounderstandtheLTEtechnology,thenetworkaccessprocedureisjustintheclosefrontofyoureyes.ThisdocumentistryingtodescribethegeneralprocedurehandlingsamongthenetworkelementsunderLTEnetworkarchitecture,bywayofshowingyoutheprocedurehandlingsinfigures.Fromthesefigures,youwillgetanoverviewoftheLTEgeneralprocedures,suchas:“TheSystemInformationHandlingυ,uTheRandomAccessProcedure,,5ttTheAttachProcedure5',ttTheTAUProcedure5',uTheHandoverProcedure55,etc.Thefirstseveralfiguresshowtheintroductionofprotocollayerstacksamongnetworkelements,suchas:protocollayerstacksubetweenUE-MMEυ,ubetweenUE-PDNGW,,5etc.Fromtheseprotocollayerstacksintroduction,youwilllearnthepeer-to-peerprotocollayersamongseveralrelatednetworkelements,itwillhelpyoutounderstandLTEprocedures'workingmechanismstuff.Andafter,beginsthedescriptionoftheLTEgeneralprocedure,inanorderfromuSysteminformationhandling,,to“ANRMeasurementprocedure55,withthettaccessProCedUre”，“handoverprocedure55,tInter-RAToperationprocedure",................................................................................5inthemiddle.Fromtheseprocedurefiguresdescription,youcangetthedeepdetailsoftheLTEnetworkaccessprocedure,anditwillfinallydirectyoutofoundawholesystem-viewofLTEarchitecture.ThisdocumentissuitablefortheguyswhowanttoknowtheLTEgeneralprocedure,oruseitasareferencebook.2009-11-06LTEPDUL3R&DTeamAbbreviationsMMEMobiHtyManageInentEntityUEUSerEqUiPmentMSMobileStationeNodeBevolvedNodeBGWGateWayPCRFPoliCyandChargingRUleSFUCtiOnH-PCRFHome-PCRFV-PCRFVisited-PCRFHSSHomeSubscriberServerEIREqUiPmentldentityRegiSterUTRANUniversalTerrestrialRadioAccessNetworkE-UTRANevolvedUTRANGERANGSM/EDGERadioAccessNetworkPLMNPublicLandMobileNetworkHPLMNHomePLMNVPLMNVisitedPLMNHLRHomeLoCationRegiSterVLRViSitorLoCationRegiSterCBCCellBroadcastCentreOMCODerationandMaintenanCeCenterBSCBaseStationControlerBTSBaseTransceiverStationBSSBaSeStationSLlbSyStemCNCoreNetworkMSC/SGSNMobile-servicesSwitchinaCentre/ServinaGPRSSUDDortNodeInter-RATRadioACCeSSTeChnolOgyMBMSMediaBroadcastandMUItiCaStSyStemMCEMUIti-CelI/multicastCoordinationEntityRNCRadioNetworkControlerNetworkelementsfunctions2eNodeBfunctions:-Headercompressionanduserplaneciphering;-MMEselectionwhennoro∪teingtoanMMEcanbedeterminedfromtheinformationprovidedbytheUE;-ULbearerlevelrateenforcementbasedonUE-AMBRandMBRviameansofuplinkscheduling(e.g.bylimitingtheamountofULresourcesgrantedperUEovertime);-DLbearerlevelrateenforcementbasedonUE-AMBR;-ULandDLbearerleveladmissioncontrol;-Transportlevelpacketmarkingintheuplink,e.g.settingtheDiffServCodePoint,basedontheQCIoftheassociatedEPSbearer.MMEfunctions:-NASsignalling;-NASsignallingsecurity;-InterCNnodesignallingformobilitybetween3GPPaccessnetworks(terminatingS3);-UEReachabilityinECM-IDLEstate(includingcontrolandexecutionofpagingretransmission);-TrackingArealistmanagement;-PDNGWandServingGWselection;-MMEselectionforhandoverswithMMEchange;-SGSNselectionforhandoversto2Gor3G3GPPaccessnetworks;-Roaming(S6atowardshomeHSS);-Authentication;-Authorization;-Bearermanagementfunctionsincludingdedicatedbearerestablishment;-LawfulInterceptionofsignallingtraffic;-Warningmessagetransferfunction(includingselectionofappropriat...
