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1、LTE系统全网信令流程系统全网信令流程IntroductionAsanewwirelessmobilecommunicationtechnology,LTE(LongTermEvolution)provideallkindsofservicesthroughnetworkaccessprocedures.SowhenyouaretryingtounderstandtheLTEtechnology,thenetworkaccessprocedureisjustintheclosefrontofyoureyes.Thisdocumentistryingtodescribethegeneralpro
2、cedurehandlingsamongthenetworkelementsunderLTEnetworkarchitecture,bywayofshowingyoutheprocedurehandlingsinfigures.Fromthesefigures,youwillgetanoverviewoftheLTEgeneralprocedures,suchas:“TheSystemInformationHandling,“TheRandomAccessProcedure,“TheAttachProcedure,“TheTAUProcedure,“TheHandoverProcedure,e
3、tc.Thefirstseveralfiguresshowtheintroductionofprotocollayerstacksamongnetworkelements,suchas:protocollayerstacks“betweenUE-MME,“betweenUE-PDNGW,etc.Fromtheseprotocollayerstacksintroduction,youwilllearnthepeer-to-peerprotocollayersamongseveralrelatednetworkelements,itwillhelpyoutounderstandLTEprocedu
4、resworkingmechanismstuff.Andafter,beginsthedescriptionoftheLTEgeneralprocedure,inanorderfrom“Systeminformationhandlingto“ANRMeasurementprocedure,withthe“accessprocedure,“handoverprocedure,“inter-RAToperationprocedure,inthemiddle.Fromtheseprocedurefiguresdescription,youcangetthedeepdetailsoftheLTEnet
5、workaccessprocedure,anditwillfinallydirectyoutofoundawhole-system-viewofLTEarchitecture.ThisdocumentissuitablefortheguyswhowanttoknowtheLTEgeneralprocedure,oruseitasareferencebook.2021-11-06AbbreviationsMMEMobilityManagementEntityUEUserEquipmentMSMobileStationeNodeBevolvedNodeBGWGateWayPCRFPolicyand
6、ChargingRulesFuctionH-PCRFHome-PCRFV-PCRFVisited-PCRFHSSHomeSubscriberServerEIREquipmentIdentityRegisterUTRANUniversalTerrestrialRadioAccessNetworkE-UTRANevolvedUTRANGERANGSM/EDGERadioAccessNetworkPLMNPublicLandMobileNetworkHPLMNHomePLMNVPLMNVisitedPLMNHLRHomeLocationRegisterVLRVisitorLocationRegist
7、erCBCCellBroadcastCentreOMCOperationandMaintenanceCenterBSCBaseStationControlerBTSBaseTransceiverStationBSSBaseStationSubsystemCNCoreNetworkMSC/SGSNMobile-servicesSwitchingCentre/ServingGPRSSupportNodeInter-RATRadioAccessTechnologyMBMSMediaBroadcastandMulticastSystemMCEMulti-cell/multicastCoordinati
8、onEntityRNCRadioNetworkControlerNetworkelementsfunctionseNodeBfunctions:-Headercompressionanduserplaneciphering;-MMEselectionwhennorouteingtoanMMEcanbedeterminedfromtheinformationprovidedbytheUE;-ULbearerlevelrateenforcementbasedonUE-AMBRandMBRviameansofuplinkscheduling(e.g.bylimitingtheamountofULre
9、sourcesgrantedperUEovertime);-DLbearerlevelrateenforcementbasedonUE-AMBR;-ULandDLbearerleveladmissioncontrol;-Transportlevelpacketmarkingintheuplink,e.g.settingtheDiffServCodePoint,basedontheQCIoftheassociatedEPSbearer.MMEfunctions:-NASsignalling;-NASsignallingsecurity;-InterCNnodesignallingformobil
10、itybetween3GPPaccessnetworks(terminatingS3);-UEReachabilityinECM-IDLEstate(includingcontrolandexecutionofpagingretransmission);-TrackingArealistmanagement;-PDNGWandServingGWselection;-MMEselectionforhandoverswithMMEchange;-SGSNselectionforhandoversto2Gor3G3GPPaccessnetworks;-Roaming(S6atowardshomeHS
11、S);-Authentication;-Authorization;-Bearermanagementfunctionsincludingdedicatedbearerestablishment;-LawfulInterceptionofsignallingtraffic;-Warningmessagetransferfunction(includingselectionofappropriateeNB);UEReachabilityprocedures.SGSNfunctions:-InterEPCnodesignallingformobilitybetween2G/3GandE-UTRAN
12、3GPPaccessnetworks;-PDNandServingGWselection:theselectionofS GW/P GWbytheSGSNisasspecifiedfortheMME;MMEselectionforhandoverstoE-UTRAN3GPPaccessnetwork.NetworkelementsfunctionsServingGWfunctions:-thelocalMobilityAnchorpointforinter-eNodeBhandover;-sendingofoneormoreendmarkertothesourceeNodeB,sourceSG
13、SNorsourceRNCimmediatelyafterswitchingthepathduringinter-eNodeBandinter-RAThandover,especiallytoassistthereorderingfunctionineNodeB.-Mobilityanchoringforinter-3GPPmobility(terminatingS4andrelayingthetrafficbetween2G/3GsystemandPDNGW);-ECM-IDLEmodedownlinkpacketbufferingandinitiationofnetworktriggere
14、dservicerequestprocedure;-LawfulInterception;-Packetrouteingandforwarding;-Transportlevelpacketmarkingintheuplinkandthedownlink,e.g.settingtheDiffServCodePoint,basedontheQCIoftheassociatedEPSbearer;-Accountingforinter-operatorcharging.ForGTP-basedS5/S8,theServingGWgeneratesaccountingdataperUEandbear
15、er;-InterfacingOFCSaccordingtochargingprinciplesandthroughreferencepointsspecifiedinTS32.24051.PDNGWfunctions:-Per-userbasedpacketfiltering(bye.g.deeppacketinspection);-LawfulInterception;-UEIPaddressallocation;-Transportlevelpacketmarkingintheuplinkanddownlink,e.g.settingtheDiffServCodePoint,basedo
16、ntheQCIoftheassociatedEPSbearer;-Accountingforinter-operatorcharging;-ULandDLservicelevelchargingasdefinedinTS23.2036(e.g.basedonSDFsdefinedbythePCRF,orbasedondeeppacketinspectiondefinedbylocalpolicy);-InterfacingOFCSthroughaccordingtochargingprinciplesandthroughreferencepointsspecifiedinTS32.24051.
17、-ULandDLservicelevelgatingcontrolasdefinedinTS23.2036;-ULandDLservicelevelrateenforcementasdefinedinTS23.2036(e.g.byratepolicing/shapingperSDF);-ULandDLrateenforcementbasedonAPN-AMBR(e.g.byratepolicing/shapingperaggregateoftrafficofallSDFsofthesameAPNthatareassociatedwithNon-GBRQCIs);Networkelements
18、functions-DLrateenforcementbasedontheaccumulatedMBRsoftheaggregateofSDFswiththesameGBRQCI(e.g.byratepolicing/shaping);-DHCPv4(serverandclient)andDHCPv6(clientandserver)functions;-ThenetworkdoesnotsupportPPPbearertypeinthisversionofthespecification.Pre-Release8PPPfunctionalityofaGGSNmaybeimplementedi
19、nthePDNGW;-packetscreening.-ULandDLbearerbindingasdefinedinTS23.2036;-ULbearerbindingverificationasdefinedinTS23.2036;-FunctionalityasdefinedinRFC486132;-AccountingperUEandbearer.H-PCRFfunctions:-terminatestheRxreferencepointforhomenetworkservices;-terminatestheS9referencepointforroamingwithlocalbre
20、akout;-associatesthesessionsestablishedoverthemultiplereferencepoints(S9,Rx),forthesameUEsIP-CANsession(PCCsessionbinding).V-PCRFfunctions:-terminatestheGxandS9referencepointsforroamingwithlocalbreakout;-terminatesRxforroamingwithlocalbreakoutandvisitedoperatorsApplicationFunction.网元间信令面总体协议栈网元间信令面总
21、体协议栈续网元间用户面总体协议栈网元间用户面总体协议栈续系统音讯广播流程Specialcomments:Thefrozendataoffiducial3GPPprotocolversion:2021/09.Systeminformationhandling:SysteminformationisdividedintotheMasterInformationBlock(MIB)andanumberofSystemInformationBlocks(SIBs).TheMIBincludesalimitednumberofmostessentialandmostfrequentlytransmitt
22、edparametersthatareneededtoacquireotherinformationfromthecell,andistransmittedonBCH.SIBsotherthanSystemInformationBlockType1arecarriedinSystemInformation(SI)messagesandmappingofSIBstoSImessagesisflexiblyconfigurablebyschedulingInfoListincludedinSystemInformationBlockType1,withrestrictionsthat:eachSI
23、BiscontainedonlyinasingleSImessage,onlySIBshavingthesameschedulingrequirement(periodicity)canbemappedtothesameSImessage,andSystemInformationBlockType2isalwaysmappedtotheSImessagethatcorrespondstothefirstentryinthelistofSImessagesinschedulingInfoList.TheremaybemultipleSImessagestransmittedwiththesame
24、periodicity.SystemInformationBlockType1andallSImessagesaretransmittedonDL-SCH.Reference:36.331:EvolvedUniversalTerrestrialRadioAccess(E-UTRA);RadioResourceControl(RRC);Protocolspecification;小区选择流程1)InitialCellSelection:ThisprocedurerequiresnopriorknowledgeofwhichRFchannelsareE-UTRAcarriers.TheUEshal
25、lscanallRFchannelsintheE-UTRAbandsaccordingtoitscapabilitiestofindasuitablecell.Oneachcarrierfrequency,theUEneedonlysearchforthestrongestcell.Onceasuitablecellisfoundthiscellshallbeselected.2)StoredInformationCellSelection:Thisprocedurerequiresstoredinformationofcarrierfrequenciesandoptionallyalsoin
26、formationoncellparameters,frompreviouslyreceivedmeasurementcontrolinformationelementsorfrompreviouslydetectedcells.OncetheUEhasfoundasuitablecelltheUEshallselectit.IfnosuitablecellisfoundtheInitialCellSelectionprocedureshallbestarted.suitablecell:AsuitablecellisacellonwhichtheUEmaycampontoobtainnorm
27、alservice.Suchacellshallfulfilallthefollowingrequirements.-Thecellispartofeither:-theselectedPLMN,or:-theregisteredPLMN,or:-aPLMNoftheEquivalentPLMNlistaccordingtothelatestinformationprovidedbyNAS:-Thecellisnotbarred-ThecellispartofatleastoneTAthatisnotpartofthelistofforbiddentrackingareasforroaming
28、,whichbelongstoaPLMNthatfulfilsthefirstbulletabove;-Thecellselectioncriteriaarefulfilled;-ForaCSGcell,theCSGIDispartoftheallowedCSGlistoftheUE.IfmorethanonePLMNidentityisbroadcastinthecell,thecellisconsideredtobepartofallTAswithTAIsconstructedfromthePLMNidentitiesandtheTACbroadcastinthecell.Referenc
29、e:36.331:EvolvedUniversalTerrestrialRadioAccess(E-UTRA);RadioResourceControl(RRC);Protocolspecification;36.304:EvolvedUniversalTerrestrialRadioAccess(E-UTRA);Equipment(UE)proceduresinidlemodeSpecialcomments:Thefrozendataoffiducial3GPPprotocolversion:2021/09.小区重选流程Reselectionprioritieshandling:1)Abso
30、luteprioritiesofdifferentE-UTRANfrequenciesorinter-RATfrequenciesmaybeprovidedtotheUEinthesysteminformation,intheRRCConnectionReleasemessage,orbyinheritingfromanotherRATatinter-RATcell(re)selection.2)Inthecaseofsysteminformation,anE-UTRANfrequencyorinter-RATfrequencymaybelistedwithoutprovidingaprior
31、ity(i.e.thefieldcellReselectionPriorityisabsentforthatfrequency).Ifprioritiesareprovidedindedicatedsignalling,theUEshallignorealltheprioritiesprovidedinsysteminformation.3)IfUEisincampedonanycellstate,UEshallonlyapplytheprioritiesprovidedbysysteminformationfromcurrentcell,andtheUEpreservespriorities
32、providedbydedicatedsignallingunlessspecifiedotherwise.4)WhentheUEincampednormallystate,hasonlydedicatedprioritiesotherthanforthecurrentfrequency,theUEshallconsiderthecurrentfrequencytobethelowestpriorityfrequency(i.e.lowerthantheeightnetworkconfiguredvalues).5)TheUEshalldeleteprioritiesprovidedbyded
33、icatedsignallingwhen:-theUEentersRRC_CONNECTEDstate;or-theoptionalvaliditytimeofdedicatedpriorities(T320)expires;or-aPLMNselectionisperformedonrequestbyNAS.6)TheUEshallonlyperformcellreselectionevaluationforE-UTRANfrequenciesandinter-RATfrequenciesthataregiveninsysteminformationandforwhichtheUEhasap
34、riorityprovided.7)TheUEshallnotconsideranyblacklistedcellsascandidateforcellreselection.8)TheUEshallinherittheprioritiesprovidedbydedicatedsignallingandtheremainingvaliditytime(i.e.,T320inE-UTRA,T322inUTRAandT3230,FFSinGERAN),ifconfigured,atinter-RATcell(re)selection.Reference:36.331:EvolvedUniversa
35、lTerrestrialRadioAccess(E-UTRA);RadioResourceControl(RRC);Protocolspecification;36.304:EvolvedUniversalTerrestrialRadioAccess(E-UTRA);Equipment(UE)proceduresinidlemodeSpecialcomments:Thefrozendataoffiducial3GPPprotocolversion:2021/09.寻呼过程流程NetworkTriggedServiceRequest(Paging)procedure:IftheMMEneedst
36、osignalwiththeUEthatisinECM-IDLEstate,e.g.toperformtheMME/HSS-initiateddetachprocedurefortheECM-IDLEmodeUEortheS GWreceivescontrolsignalling(e.g.CreateDedicatedBearerRequestorModifyDedicatedBearerRequest),theMMEstartsnetworktriggeredservicerequestprocedurefromstep3.IfISRisactivated,whentheServingGWr
37、eceivesaCreateDedicatedBearerRequestorModifyBearerRequestforaUE,andtheS GWdoesnothaveadownlinkS1-UandtheSGSNhasnotifiedtheServingGWthattheUEhasmovedtoPMM-IDLEorSTANDBYstate,theServingGWbufferssignallingmessagesandtriggersMMEandSGSNtopageUE.InthiscasetheS GWwillbenotifiedaboutthecurrentRATtypebasedon
38、theUEtriggeredservicerequestprocedure.TheS GWwillgoonexecutingthededicatedbeareractivationordedicatedbearermodificationprocedure,i.e.sendthecorrespondingbufferedsignallingtoMMEorSGSNwhichUEresidesinnowandinformthecurrentRATtypetothePDNGWiftheRATtypehasbeenchangedcomparedtothelastreportedRATType.Ifdy
39、namicPCCisdeployed,thecurrentRATtypeinformationshallalsobeconveyedfromthePDNGWtothePCRF.IfthePCRFresponseleadstoanEPSbearermodificationthePDNGWshouldinitiateabearerupdateprocedureasspecifiedinclause5.4.2.1below.Reference:23.401:GeneralPacketRadioService(GPRS)enhancementsforEvolvedUniversalTerrestria
40、lRadioAccessNetwork(E-UTRAN)access;36.331:EvolvedUniversalTerrestrialRadioAccess(E-UTRA);RadioResourceControl(RRC);Protocolspecification;36.413:EvolvedUniversalTerrestrialRadioAccess(E-UTRA);S1ApplicationProtocol(S1AP).随机接入流程RandomAccessprocedure:Therandomaccessprocedureischaracterizedby:-Commonproc
41、edureforFDDandTDD;-Oneprocedureirrespectiveofcellsize;Therandomaccessprocedureisperformedforthefollowingfiveevents:-InitialaccessfromRRC_IDLE;-RRCConnectionRe-establishmentprocedure;-Handover;-DLdataarrivalduringRRC_CONNECTEDrequiringrandomaccessprocedure;-E.g.whenULsynchronisationstatusis“non-synch
42、ronised;-ULdataarrivalduringRRC_CONNECTEDrequiringrandomaccessprocedure;-E.g.whenULsynchronisationstatusisnon-synchronisedortherearenoPUCCHresourcesforSRavailable.Furthermore,therandomaccessproceduretakestwodistinctforms:-Contentionbased(applicabletoallfiveevents);-Non-contentionbased(applicabletoon
43、lyhandoverandDLdataarrival).NormalDL/ULtransmissioncantakeplaceaftertherandomaccessprocedure.Reference:36.300:EvolvedUniversalTerrestrialRadioAccess(E-UTRA)andEvolvedUniversalTerrestrialRadioAccessNetwork(E-UTRAN);Overalldescription;Stage2.ATTACH流程ATTACH流程E-UTRANInitialAttachprocedure:AUE/userneedst
44、oregisterwiththenetworktoreceiveservicesthatrequireregistration.ThisregistrationisdescribedasNetworkAttachment.Thealways-onIPconnectivityforUE/usersoftheEPSisenabledbyestablishingadefaultEPSbearerduringNetworkAttachment.ThePCCrulesappliedtothedefaultEPSbearermaybepredefinedinthePDNGWandactivatedinth
45、eattachmentbythePDNGWitself.TheAttachproceduremaytriggeroneormultipleDedicatedBearerEstablishmentprocedurestoestablishdedicatedEPSbearer(s)forthatUE.Duringtheattachprocedure,theUEmayrequestforanIPaddressallocation.TerminalsutilisingonlyIETFbasedmechanismsforIPaddressallocationarealsosupported.During
46、theInitialAttachproceduretheMobileEquipmentIdentityisobtainedfromtheUE.TheMMEoperatormaychecktheMEIdentitywithanEIR.Atleastinroamingsituations,theMMEshouldpasstheMEIdentitytotheHSS,and,ifaPDNGWoutsideoftheVPLMN,shouldpasstheMEIdentitytothePDNGW.TheE-UTRANInitialAttachprocedureisusedforEmergencyAttac
47、hbyUEsthatneedtoperformemergencyservicesbutcannotgainnormalservicesfromthenetwork.TheseUEsareinlimitedservicestateasdefinedinTS23.12210.AlsoUEsthathadattachedfornormalservicesanddonothaveemergencybearersestablishedandarecampedonacellinlimitedservicestate(e.g.restrictedTrackingAreaornotallowedCSG)sha
48、llinitiatetheAttachproceduresindicatingthattheattachistoreceiveemergencyservices.UEsthatcampnormallyonacell,i.e.UEsthatarenotinlimitedservicestate,shouldinitiatenormalinitialattachwhennotalreadyattachedandshallinitiatetheUERequestedPDNConnectivityproceduretoreceiveemergencyEPSbearerservices.NOTE1:AU
49、Ethatisemergencyattachedperformsinitialattachprocedurebeforebeingabletoobtainnormalservices.Reference:23.401:GeneralPacketRadioService(GPRS)enhancementsforEvolvedUniversalTerrestrialRadioAccessNetwork(E-UTRAN)access;36.331:EvolvedUniversalTerrestrialRadioAccess(E-UTRA);RadioResourceControl(RRC);Prot
50、ocolspecification;36.413:EvolvedUniversalTerrestrialRadioAccess(E-UTRA);S1ApplicationProtocol(S1AP).TAU流程E-UTRANTrackingAreaUpdateprocedures:TheprocedureisinitiatedbyanUEineitherECM-IDLEstateorECM-CONNECTEDstate.NOTE1:Ifthetrackingareaupdateprocedurefailsamaximumallowablenumberoftimes,oriftheMMEretu
51、rnsaTrackingAreaUpdateReject(Cause)message,theUEshallenterEMMDEREGISTEREDstate.IftheUpdateLocationAckmessageindicatesareject,thisshouldbeindicatedtotheUE,andtheUEshallnotaccessnon-PSservicesuntilasuccessfullocationupdateisperformed.Reference:23.401:GeneralPacketRadioService(GPRS)enhancementsforEvolv
52、edUniversalTerrestrialRadioAccessNetwork(E-UTRAN)access;36.331:EvolvedUniversalTerrestrialRadioAccess(E-UTRA);RadioResourceControl(RRC);Protocolspecification;36.413:EvolvedUniversalTerrestrialRadioAccess(E-UTRA);S1ApplicationProtocol(S1AP).DETACH流程UE-initiatedDetachprocedureforE-UTRAN:TheDetachproce
53、dureisthatUEcampsonE-UTRANandDetachRequestissenttoMME.Reference:23.401:GeneralPacketRadioService(GPRS)enhancementsforEvolvedUniversalTerrestrialRadioAccessNetwork(E-UTRAN)access;36.331:EvolvedUniversalTerrestrialRadioAccess(E-UTRA);RadioResourceControl(RRC);Protocolspecification;36.413:EvolvedUniver
54、salTerrestrialRadioAccess(E-UTRA);S1ApplicationProtocol(S1AP).鉴权流程鉴权流程E-UTRANAuthenticationandKeyAgreementprocedure:EPSAKAistheauthenticationandkeyagreementprocedurethatshallbeusedoverE-UTRAN,betweentheUEandMME.EPSAKAisspecifiedinTS33.40141.EPSAKAshallproducekeyingmaterialformingabasisforuserplane(U
55、P),RRC,andNAScipheringkeysaswellasRRCandNASintegrityprotectionkeys.Reference:23.401:GeneralPacketRadioService(GPRS)enhancementsforEvolvedUniversalTerrestrialRadioAccessNetwork(E-UTRAN)access;33.401:3GPPSystemArchitectureEvolution(SAE);Securityarchitecture.36.331:EvolvedUniversalTerrestrialRadioAcces
56、s(E-UTRA);RadioResourceControl(RRC);Protocolspecification;36.413:EvolvedUniversalTerrestrialRadioAccess(E-UTRA);S1ApplicationProtocol(S1AP).UE呼叫流程Reference:23.401:GeneralPacketRadioService(GPRS)enhancementsforEvolvedUniversalTerrestrialRadioAccessNetwork(E-UTRAN)access;36.331:EvolvedUniversalTerrest
57、rialRadioAccess(E-UTRA);RadioResourceControl(RRC);Protocolspecification;36.413:EvolvedUniversalTerrestrialRadioAccess(E-UTRA);S1ApplicationProtocol(S1AP).遨游用户效力过程E-UTRANRoamingprocedure:IntheroamingscenariothevPLMNoperatesGn/Gp2Gand/or3GSGSNsaswellasMMEandS GWforE-UTRANaccess.ThehPLMNoperatesaP GW.R
58、oamingandinteraccessmobilitybetweenGn/Gp2Gand/or3GSGSNsandanMME/S GWareenabledby:-GnfunctionalityasspecifiedbetweentwoGn/GpSGSNs,whichisprovidedbytheMME,and-GpfunctionalityasspecifiedbetweenGn/GpSGSNandGn/GpGGSNthatisprovidedbytheP GW.AllthisGpandGnfunctionalitybasesonGTPversion1only.Forroamingsubsc
59、riberstheMMEmayalternativelychoosetheRFSPIndexinusebasedonthevisitednetworkpolicy(e.g.,anRFSPIndexvaluepre-configuredperHPLMN,orasingleRFSPIndexvaluetobeusedforallroamersindependentoftheHPLMN).Reference:23.401:GeneralPacketRadioService(GPRS)enhancementsforEvolvedUniversalTerrestrialRadioAccessNetwor
60、k(E-UTRAN)access;36.331:EvolvedUniversalTerrestrialRadioAccess(E-UTRA);RadioResourceControl(RRC);Protocolspecification;36.413:EvolvedUniversalTerrestrialRadioAccess(E-UTRA);S1ApplicationProtocol(S1AP).UE上下文修正流程HSStoupdatetheHSSuserprofilestoredintheMME.WhenevertheHSSuserprofileischangedforauserinthe
61、HSS,andthechangesaffecttheHSSuserprofilestoredintheMME,theMMEshallbeinformed.TheMMEbuildsaSessionManagementRequestincludingthePTI,EPSBearerQoSparameters(excludingARP),TFT,APNAMBRandEPSBearerIdentity.HSStoupdatetheHSSuserprofilestoredintheMME.WhenevertheHSSuserprofileischangedforauserintheHSS,andthec
62、hangesaffecttheHSSuserprofilestoredintheMME,theMMEshallbeinformed.IftheQCIand/orARPand/orsubscribedAPN-AMBRhasbeenmodifiedandthereisrelatedactivePDNconnectionwiththemodifiedQoSProfiletheMMEsendstheModifyBearerCommand(EPSBearerIdentity,EPSBearerQoS,APNAMBR)messagetotheServingGW.TheEPSBearerIdentityid
63、entifiesthedefaultbeareroftheaffectedPDNconnection.TheEPSBearerQoScontainstheEPSsubscribedQoSprofiletobeupdated.TheServingGWsendstheModifyBearerCommand(EPSBearerIdentity,EPSBearerQoS,APNAMBR)messagetothePDNGWIftheQCIand/orARPparameter(s)havebeenmodified,TheServingGWsendstheUpdateBearerRequest(PTI,EP
64、SBearerIdentity,EPSBearerQoS,TFT,APNAMBR)messagetotheMMETheMMEbuildsaSessionManagementRequestincludingthePTI,EPSBearerQoSparameters(excludingARP),TFT,APNAMBRandEPSBearerIdentity.UE上下文修正流程续HSStoupdatetheHSSuserprofilestoredintheMME.WhenevertheHSSuserprofileischangedforauserintheHSS,andthechangesaffec
65、ttheHSSuserprofilestoredintheMME,theMMEshallbeinformed.IfneithertheQCInortheARPhavebeenmodified,butinsteadonlytheAPN-AMBRwasupdated,TheMMEbuildsaSessionManagementRequestmessageincludingtheTFT,APN-AMBRandEPSBearerIdentity.TheMMEthensendsaDownlinkNASTransport(SessionManagementConfiguration)messagetoth
66、eeNodeB.IftheAPNAMBRhaschanged,theMMEmayalsoupdatetheUEAMBR.TheeNodeBsendstheDirectTransfer(SessionManagementRequest)messagetotheUE.TheUEusestheuplinkpacketfilter(ULTFT)todeterminethemappingoftrafficflowstotheradiobearer.TheUEstoresthemodifiedAPN-AMBRvalue.TheUEshallsetitsTINtoGUTIifthemodifiedEPSbe
67、arerwasestablishedbeforeISRactivation.TheUENASlayerbuildsaSessionManagementResponseincludingEPSBearerIdentity.TheUEthensendsaDirectTransfer(SessionManagementResponse)messagetotheeNodeB.UE上下文释放流程TheHSS-InitiatedDetachprocedureisinitiatedbytheHSS.TheHSSusesthisprocedureforoperator-determinedpurposesto
68、requesttheremovalofasubscribersMMandEPSbearerattheMMEandalsoattheSGSNifbothanMMEandanSGSNareregisteredintheHSS.IftheHSSwantstorequesttheimmediatedeletionofasubscribersMMcontextsandEPSBearers,theHSSshallsendaCancelLocation(IMSI,CancellationType)messagewithCancellationTypesettoSubscriptionWithdrawntot
69、heregisteredMMEandalsototheSGSNifanSGSNisalsoregistered.TheUEwillreceiveonlyoneDetachRequestmessageintheRATwhereitcurrentlycampsonIftheMMEhasanactiveUEcontext,theMMEsendsaDeleteSessionRequest(TEID)messagetotheServingGWtodeactivatetheEPSBearerContextinformationintheServingGW.WhentheSGWreceivesthefirs
70、tDeleteSessionRequestmessagefromtheMMEorSGSNinISRactivatedstate,theServingGWdeactivatesISR,releasestherelatedEPSBearercontextinformationandrespondswithDeleteSessionResponseAfterreceivingtheDetachAcceptmessage,theMMEreleasestheS1-MMEsignallingconnectionfortheUEbysendingS1ReleaseCommand(Cause)messaget
71、otheeNodeBwithCausesettoDetach.ThedetailsofthissteparecoveredintheS1ReleaseProcedure,TheUEsendsNASmessageDetachRequest(GUTI,SwitchOff)totheMME.ThisNASmessageisusedtotriggertheestablishmentoftheS1connectioniftheUEwasinECM-IDLEmode.SwitchOffindicateswhetherdetachisduetoaswitchoffsituationornot.TheeNod
72、eBforwardsthisNASmessagetotheMMEalongwiththeTAI+ECGIofthecellwhichtheUEisusing.UE上下文释放流程续TheMMEinitiateddetachprocedureiseitherexplicit(e.g.byO&Mintervention)orimplicit.TheMMEmayimplicitlydetachaUE,ifithasnothadcommunicationwithUEforalongperiodoftime.TheMMEdoesnotsendtheDetachRequest(DetachType)mess
73、agetotheUEforimplicitdetach.TheimplicitdetachislocaltotheMME,i.e.anSGSNregistrationwillnotbedetached.IftheUEisinECM-CONNNECTEDstatetheMMEmayexplicitlydetachtheUEbysendingaDetachRequestmessagetotheUE.TheDetachTypemaybesettore-attachinwhichcasetheUEshouldre-attachattheendofthedetachprocess.IftheUEisin
74、ECM-IDLEstatetheMMEpagestheUE.AnyEPSBearerContextinformationintheServingGWregardingthisparticularUEandrelatedtotheMMEaredeactivatedbytheMMEsendingDeleteSessionRequest(TEID)messagetotheServingGW.IfthePDNGWrequestedUEslocationinfo,theMMEalsoincludestheUserLocationInformationIEinthismessage.WhentheSGWr
75、eceivesthefirstDeleteSessionRequestmessagefromtheMMEorSGSNinISRactivatedstate,theServingGWdeactivatesISR,releasestherelatedEPSBearercontextinformationandrespondswithDeleteSessionResponse(TEID).WhentheSGWreceivestheDeleteSessionRequestmessagefromtheMMEorSGSNinISRdeactivatedstate,theServingGWreleasest
76、herelatedEPSBearercontextinformationandjumpstostep6bysendingaDeleteSessionRequest(TEID)messagetothePDNGW.Afterstep7theServingGWrespondsbacktotheMME/SGSNwiththeDeleteSessionResponse(TEID)message.IftheUEreceivestheDetachRequestmessagefromtheMMEinthestep1,theUEsendsaDetachAcceptmessagetotheMMEanytimeaf
77、terstep1.TheeNodeBforwardsthisNASmessagetotheMMEalongwiththeTAI+ECGIofthecellwhichtheUEisusing.AfterreceivingtheDetachAcceptmessage,DeleteSessionResponseand,ifappropriate,DetachAcknowledgemessage,theMMEreleasestheS1-MMEsignallingconnectionfortheUEbysendinganS1ReleaseCommand(Cause)messagetotheeNodeB.
78、ThedetailsofthissteparecoveredintheS1ReleaseProcedure,asdescribedinclause5.3.5bystep4tostep6.IftheDetachTyperequeststheUEtomakeanewattach,theUEreattachesaftertheRRCConnectionReleaseiscompleted.E-RAB建立流程IfdynamicPCCisdeployed,thePCRFsendsaPCCdecisionprovision(QoSpolicy)messagetothePDNGW.Thiscorrespon
79、dstotheinitialstepsofthePCRF-InitiatedIPCANSessionModificationprocedureortothePCRFresponseinthePCEFinitiatedIP-CANSessionModificationprocedureasdefinedinTS23.2036,uptothepointthatthePDNGWrequestsIPCANBearerSignalling.IfdynamicPCCisnotdeployed,thePDNGWmayapplylocalQoSpolicy.TheServingGWsendstheCreate
80、BearerRequest(IMSI,PTI,EPSBearerQoS,TFT,S1-TEID,LBI,ProtocolConfigurationOptions)messagetotheMME.TheMMEselectsanEPSBearerIdentity,whichhasnotyetbeenassignedtotheUE.TheMMEthenbuildsaSessionManagementRequestincludingthePTI,TFT,EPSBearerQoSparameters(excludingARP),ProtocolConfigurationOptions,theEPSBea
81、rerIdentityandtheLinkedEPSBearerIdentity(LBI).IftheUEhasUTRANorGERANcapabilities,theMMEusestheEPSbearerQoSparameterstoderivethecorrespondingPDPcontextparametersQoSNegotiated(R99QoSprofile),RadioPriority,PacketFlowIdandTIandincludesthemintheSessionManagementRequest.IftheUEindicatedintheUENetworkCapab
82、ilityitdoesnotsupportBSSpacketflowprocedures,thentheMMEshallnotincludethePacketFlowId.TheMMEthensignalstheBearerSetupRequest(EPSBearerIdentity,EPSBearerQoS,SessionManagementRequest,S1-TEID)messagetotheeNodeB.TheeNodeBmapstheEPSBearerQoStotheRadioBearerQoS.ItthensignalsaRRCConnectionReconfiguration(R
83、adioBearerQoS,SessionManagementRequest,EPSRBIdentity)messagetotheUE.TheUEshallstoretheQoSNegotiated,RadioPriority,PacketFlowIdandTI,whichitreceivedintheSessionManagementRequest,forusewhenaccessingviaGERANorUTRAN.TheUENASstorestheEPSBearerIdentityandlinksthededicatedbearertothedefaultbearerindicatedb
84、ytheLinkedEPSBearerIdentity(LBI).TheUEusestheuplinkpacketfilter(ULTFT)todeterminethemappingoftrafficflowstotheradiobearer.TheUEmayprovidetheEPSBearerQoSparameterstotheapplicationhandlingthetrafficflow.TheapplicationusageoftheEPSBearerQoSisimplementationdependent.TheUEshallnotrejecttheRRCConnectionRe
85、configurationonthebasisoftheEPSBearerQoSparameterscontainedintheSessionManagementRequest.TheUENASlayerbuildsaSessionManagementResponseincludingEPSBearerIdentity.TheUEthensendsaDirectTransfer(SessionManagementResponse)messagetotheeNodeB.E-RAB建立流程ThepurposeoftheUErequestedbearerresourceallocationproce
86、dureisforaUEtorequestanallocationofbearerresourcesforatrafficflowaggregate.TheUErequestsaspecificQoSdemand(QCI)andoptionallysendsaGBRrequirementforanewtrafficflowaggregate.Ifacceptedbythenetwork,thisprocedureinvokesadedicatedEPSbearercontextactivationprocedure(seesubclause6.4.2)oranEPSbearercontextm
87、odificationprocedure(seesubclause6.4.3).Inordertorequesttheallocationofbearerresourcesforonetrafficflowaggregate,theUEshallsendaBEARERRESOURCEALLOCATIONREQUESTmessagetotheMME,starttimerT3480andenterthestatePROCEDURETRANSACTIONPENDINGUponreceiptoftheBEARERRESOURCEALLOCATIONREQUESTmessage,theMMEchecks
88、whethertheresourcesrequestedbytheUEcanbeestablishedbyverifyingtheEPSbeareridentitygivenintheLinkedEPSbeareridentityIEtobeanyoftheactivedefaultEPSbearercontext(s).Ifthebearerresourceallocationrequestedisacceptedbythenetwork,theMMEshallinitiateeitheradedicatedEPSbearercontextactivationprocedureoranEPS
89、bearercontextmodificationprocedure.E-RAB释放流程RadiobearersfortheUEintheECM-CONNECTEDstatemaybereleasedduetolocalreasons(e.g.abnormalresourcelimitationorradioconditionsdonotallowtheeNodeBtomaintainalltheallocatedGBRbearers:itisnotexpectedthatnon-GBRbearersarereleasedbytheeNodeBunlesscausedbyerrorsituat
90、ions).TheUEdeletesthebearercontextsrelatedtothereleasedradiobearers.WhentheeNodeBreleasesradiobearersinstep0,itsendsanindicationofbearerreleasetotheMME.Thisindicationmaybee.g.theBearerReleaseRequest(EPSBearerIdentity)messagetotheMME,oralternativelyInitialContextSetupComplete,HandoverRequestAckandUEC
91、ontextResponse,PathSwitchRequestmayalsoindicatethereleaseofabearer.TheMMEsendstheDeleteBearerCommand(EPSBearerIdentity)messagetotheServingGWtodeactivatetheselecteddedicatedbearer.TheServingGWsendstheDeleteBearerRequest(EPSBearerIdentity)messagetotheMME.TheMMEdeletesthebearercontextsrelatedtothedeact
92、ivatedEPSbearerandacknowledgesthebearerdeactivationtotheServingGWbysendingaDeleteBearerResponse(EPSBearerIdentity)message.ThepurposeoftheUErequestedPDNdisconnectionprocedureisforaUEtorequestdisconnectionfromonePDN.TheUEcaninitiatethisproceduretodisconnectfromanyPDNaslongasitisconnectedtoatleastoneot
93、herPDN.Withthisprocedure,allEPSbearercontextsestablishedtowardsthisPDN,includingthedefaultEPSbearercontext,arereleased.E-RAB修正流程TheUErequestedbearerresourcemodificationprocedureforanE-UTRANallowstheUEtorequestforamodificationofbearerresources(e.g.allocationorreleaseofresources)foronetrafficflowaggre
94、gatewithaspecificQoSdemand.Alternatively,theprocedureallowstheUEtorequestforthemodificationofthepacketfiltersusedforanactivetrafficflowaggregate,withoutchangingQoS.Ifacceptedbythenetwork,therequestinvokeseithertheDedicatedBearerActivationProcedure,theBearerModificationProcedureoradedicatedbearerisde
95、activatedusingthePDNGWInitiatedBearerDeactivationProcedure.TheprocedureisusedbytheUEwhentheUEalreadyhasaPDNconnectionwiththePDNGW.AUEcansendasubsequentRequestBearerResourceModificationMessagebeforethepreviousprocedureiscompleted.RRC重建流程RRCConnectionEstablishmentprocedure:Thepurposeofthisprocedureist
96、ore-establishtheRRCconnection,whichinvolvestheresumptionofSRB1operationandthere-activationofsecurity.AUEinRRC_CONNECTED,forwhichsecurityhasbeenactivated,mayinitiatetheprocedureinordertocontinuetheRRCconnection.Theconnectionre-establishmentsucceedsonlyiftheconcernedcellispreparedi.e.hasavalidUEcontex
97、t.IncaseE-UTRANacceptsthere-establishment,SRB1operationresumeswhiletheoperationofotherradiobearersremainssuspended.IfASsecurityhasnotbeenactivated,theUEdoesnotinitiatetheprocedurebutinsteadmovestoRRC_IDLEdirectly.E-UTRANappliestheprocedureasfollows:-toreconfigureSRB1andtoresumedatatransferonlyforthi
98、sRB;-tore-activateASsecuritywithoutchangingalgorithms.ThefirstRRCConnectionReconfigurationmessageisusedtoresumeSRB2andallDRBsthataresuspendedaftersuccessfulcompletionoftheRRCConnectionRe-establishmentprocedure.Reference:36.331:EvolvedUniversalTerrestrialRadioAccess(E-UTRA);RadioResourceControl(RRC);
99、Protocolspecification.Special comments: The frozen date of fiducial 3GPP protocol version : 2021/09.RRC重建到目的小区流程RRCConnectionRe-establishmentCrossInter-eNBHandoverprocedure:IncaseofInter-eNBhandoverwithinE-UTRA,WhentherearetheUEcontextinthetargeteNB.TheUEmaybeinitiatetheRRCconnectionre-establishment
100、procedureduetohandoverfailure,andthecurrentcellisthehandovertargetcellorothercellsundercontrolofthetargeteNB.TheInter-eNBhandoverprocedurecontinueexecuteaftersuccessfulcompletionoftheRRCConnectionRe-establishmentprocedure.Reference:36.331:EvolvedUniversalTerrestrialRadioAccess(E-UTRA);RadioResourceC
101、ontrol(RRC);Protocolspecification.小区内切换流程Intra-CellHandoverprocedure:Anintra-cellhandoverproceduremaybeusedtochangethekeysinRRC_CONNECTED.Theprocedureisperformedforthefollowingcase:-IfASKeys(KUPenc,KRRCintandKRRCenc)needtobechangedinRRC_CONNECTED,anintra-cellhandovershallbeused.-E.g.1:MMEtriggersani
102、ntracellhandoverbecauseKeNBrefreshperiodically.-E.g.2:ForX2-handoverprocedure,ThetargeteNBcanimmediatelyinitiateanintra-cellhandovertotakethenewNHintouseoncethenewNHhasarrivedintheS1PATHSWITCHREQUESTACKNOWLEDGE.-Anintra-cellhandoverprocedureshallbeinitiatedbytheeNBwhenaPDCPCOUNTsisabouttobere-usedwi
103、ththesameRadioBeareridentityandwiththesameKeNB,andtheKeNBisre-freshedw.r.t.theRRCandUPCOUNTaftertheprocedure.Reference:23.401:GeneralPacketRadioService(GPRS)enhancementsforEvolvedUniversalTerrestrialRadioAccessNetwork(E-UTRAN)access;33.401:3GPPSystemArchitectureEvolution(SAE);Securityarchitecture;36
104、.331:EvolvedUniversalTerrestrialRadioAccess(E-UTRA);RadioResourceControl(RRC);Protocolspecification.eNodeB内切换流程Inter-CellHandoverprocedure:TheprocedureisusedtohandoveraUEfromasourcecelltoatargetcellinthesameeNodeB.IntheproceduretheMMEandtheeNodeBisunchanged,anditisnotrequiredtochangetheASsecurityalg
105、orithmduringintra-eNBhandover.Reference:23.401:GeneralPacketRadioService(GPRS)enhancementsforEvolvedUniversalTerrestrialRadioAccessNetwork(E-UTRAN)access;33.401:3GPPSystemArchitectureEvolution(SAE);Securityarchitecture;36.331:EvolvedUniversalTerrestrialRadioAccess(E-UTRA);RadioResourceControl(RRC);P
106、rotocolspecification;36.423:EvolvedUniversalTerrestrialRadioAccess(E-UTRA);X2applicationprotocol(X2AP);36.413:EvolvedUniversalTerrestrialRadioAccess(E-UTRA);S1ApplicationProtocol(S1AP).eNodeB间S1接口切换流程eNodeB间S1接口切换流程S1-basedhandoverprocedure:TheS1-basedhandoverprocedureisusedwhentheX2-basedhandoverca
107、nnotbeused.ThesourceeNodeBinitiatesahandoverbysendingHandoverRequiredmessageovertheS1-MMEreferencepoint.ThisproceduremayrelocatetheMMEand/ortheServingGW.ThesourceMMEselectsthetargetMME.TheMMEshouldnotberelocatedduringinter-eNodeBhandoverunlesstheUEleavestheMMEPoolAreawheretheUEisserved.TheMME(target
108、MMEforMMErelocation)determinesiftheServingGWneedstoberelocated.IftheServingGWneedstoberelocatedtheMMEselectsthetargetServingGW.ThesourceeNodeBdecideswhichoftheEPSbearersaresubjectforforwardingofpacketsfromthesourceeNodeBtothetargeteNodeB.TheEPCdoesnotchangethedecisionstakenbytheRANnode.Packetforward
109、ingcantakeplaceeitherdirectlyfromthesourceeNodeBtothetargeteNodeB,orindirectlyfromthesourceeNodeBtothetargeteNodeBviathesourceandtargetServingGWs(oriftheServingGWisnotrelocated,onlythesingleServingGW).TheavailabilityofadirectforwardingpathisdeterminedinthesourceeNodeBandindicatedtothesourceMME.IfX2c
110、onnectivityisavailablebetweenthesourceandtargeteNodeBs,adirectforwardingpathisavailable.Ifadirectforwardingpathisnotavailable,indirectforwardingmaybeused.ThesourceMMEusestheindicationfromthesourceeNodeBtodeterminewhethertoapplyindirectforwarding.ThesourceMMEindicatestothetargetMMEwhetherindirectforw
111、ardingshouldapply.Basedonthisindication,thetargetMMEdetermineswhetheritappliesindirectforwarding.Reference:23.401:GeneralPacketRadioService(GPRS)enhancementsforEvolvedUniversalTerrestrialRadioAccessNetwork(E-UTRAN)access;36.331:EvolvedUniversalTerrestrialRadioAccess(E-UTRA);RadioResourceControl(RRC)
112、;Protocolspecification;36.413:EvolvedUniversalTerrestrialRadioAccess(E-UTRA);S1ApplicationProtocol(S1AP).eNodeB间X2接口切换流程X2-basedhandoverwithServingGWrelocationprocedure:TheprocedureisusedtohandoveraUEfromasourceeNodeBtoatargeteNodeBusingtheX2referencepoint.IntheproceduretheMMEisunchanged.Inadditiont
113、otheX2referencepointbetweenthesourceandtargeteNodeB,theproceduresrelyonthepresenceofS1-MMEreferencepointbetweentheMMEandthesourceeNodeBaswellasbetweentheMMEandthetargeteNodeB.ThehandoverpreparationandexecutionphasesareperformedasspecifiedinTS36.3005.IfemergencybearerservicesareongoingfortheUEhandove
114、rtothetargeteNodeBisperformedindependentoftheHandoverRestrictionList.TheMMEchecks,aspartoftheTrackingAreaUpdateintheexecutionphase,ifthehandoveristoarestrictedareaandifsoMMEreleasesthenon-emergencybearers.WhentheUEreceivesthehandovercommanditwillremoveanyEPSbearersforwhichitdidnotreceivethecorrespon
115、dingEPSradiobearersinthetargetcell.Aspartofhandoverexecution,downlinkpacketsareforwardedfromthesourceeNodeBtothetargeteNodeB.WhentheUEhasarrivedtothetargeteNodeB,downlinkdataforwardedfromthesourceeNodeBcanbesenttoit.UplinkdatafromtheUEcanbedeliveredviathe(source)ServingGWtothePDNGW.Onlythehandoverco
116、mpletionphaseisaffectedbyapotentialchangeoftheServingGW,thehandoverpreparationandexecutionphasesareidentical.IftheMMEreceivesarejectiontoaNASprocedure(e.g.dedicatedbearerestablishment/modification/release;locationreportingcontrol;NASmessagetransfer;etc.)fromtheeNodeBwithanindicationthatanX2handoveri
117、sinprogress(seeTS36.3005),theMMEshallreattemptthesameNASprocedureeitherwhenthehandoveriscompleteorthehandoverisdeemedtohavefailed.ThefailureisknownbyexpiryofthetimerguardingtheNASprocedure.Reference:23.401:GeneralPacketRadioService(GPRS)enhancementsforEvolvedUniversalTerrestrialRadioAccessNetwork(E-
118、UTRAN)access;36.331:EvolvedUniversalTerrestrialRadioAccess(E-UTRA);RadioResourceControl(RRC);Protocolspecification;36.423:EvolvedUniversalTerrestrialRadioAccess(E-UTRA);X2applicationprotocol(X2AP).LTE2UTRAN切换流程LTE2UTRAN切换流程UTRANS2LTE切换流程UTRANS2LTE切换流程LTE2GERAN切换流程LTE2GERAN切换流程GERAN2LTE切换流程GERAN2LTE切
119、换流程LTE2CDMA切换流程优化LTE2CDMA切换流程优化CDMA2LTE切换流程优化LTE2CDMA切换流程非优化CDMA2LTE切换流程非优化CSFB流程PSHOE-UTRANToGSM/UMTSCSFBprocedureMobileTerminatingcallinactivemodeWithPSHO:TheCSfallbackinEPSenablestheprovisioningofvoiceandotherCS-domainservices(e.g.CSUDIvideo/SMS/LCS/USSD)byreuseofCSinfrastructurewhentheUEisserved
120、byE UTRAN.ACSfallbackenabledterminal,connectedtoE UTRANmayuseGERANorUTRANtoconnecttotheCS domain.ThisfunctionisonlyavailableincaseE UTRANcoverageisoverlappedbyeitherGERANcoverageorUTRANcoverage.CSFallbackandIMS basedservicesshallbeabletoco-existinthesameoperatorsnetwork.Reference:23.401:GeneralPacke
121、tRadioService(GPRS)enhancementsforEvolvedUniversalTerrestrialRadioAccessNetwork(E-UTRAN)access;23.272:3rdGenerationPartnershipProject;TechnicalSpecificationGroupServicesandSystemAspects;CircuitSwitchedFallbackinEvolvedPacketSystem;36.413:EvolvedUniversalTerrestrialRadioAccess(E-UTRA);S1ApplicationPr
122、otocol(S1AP).CSFB流程non-PSHOE-UTRANToGSM/UMTSCSFBprocedureMobileTerminatingcallinactivemodeNoPSHO:TheCSfallbackinEPSenablestheprovisioningofvoiceandotherCS-domainservices(e.g.CSUDIvideo/SMS/LCS/USSD)byreuseofCSinfrastructurewhentheUEisservedbyE UTRAN.ACSfallbackenabledterminal,connectedtoE UTRANmayus
123、eGERANorUTRANtoconnecttotheCS domain.ThisfunctionisonlyavailableincaseE UTRANcoverageisoverlappedbyeitherGERANcoverageorUTRANcoverage.CSFallbackandIMS basedservicesshallbeabletoco-existinthesameoperatorsnetwork.Reference:23.401:GeneralPacketRadioService(GPRS)enhancementsforEvolvedUniversalTerrestria
124、lRadioAccessNetwork(E-UTRAN)access;23.272:3rdGenerationPartnershipProject;TechnicalSpecificationGroupServicesandSystemAspects;CircuitSwitchedFallbackinEvolvedPacketSystem;36.413:EvolvedUniversalTerrestrialRadioAccess(E-UTRA);S1ApplicationProtocol(S1AP).CSFB流程IDLEE-UTRANToGSM/UMTSCSFBprocedureMobileT
125、erminatingcallinidlemode:TheCSfallbackinEPSenablestheprovisioningofvoiceandotherCS-domainservices(e.g.CSUDIvideo/SMS/LCS/USSD)byreuseofCSinfrastructurewhentheUEisservedbyE UTRAN.ACSfallbackenabledterminal,connectedtoE UTRANmayuseGERANorUTRANtoconnecttotheCS domain.ThisfunctionisonlyavailableincaseE
126、UTRANcoverageisoverlappedbyeitherGERANcoverageorUTRANcoverage.CSFallbackandIMS basedservicesshallbeabletoco-existinthesameoperatorsnetwork.Reference:23.401:GeneralPacketRadioService(GPRS)enhancementsforEvolvedUniversalTerrestrialRadioAccessNetwork(E-UTRAN)access;23.272:3rdGenerationPartnershipProjec
127、t;TechnicalSpecificationGroupServicesandSystemAspects;CircuitSwitchedFallbackinEvolvedPacketSystem;36.413:EvolvedUniversalTerrestrialRadioAccess(E-UTRA);S1ApplicationProtocol(S1AP).SRVCC流程CDMAE-UTRANToCDMA1XRTTSRVCCprocedure:ForSRVCC-capableUEs,thecallisalwaysanchoredattheVCCASinthe3GPP2sIMS.The3GPP
128、21xCSIWSenablesasingleradioUEtocommunicateinparallelbothwiththesourcesystemandthetargetsystem.FromVCCperspective,thismechanismminimizesthevoicegapbysupportingthetransportofsignallingforestablishmentofthetargetCSaccesslegwhiletheterminalisconnectedtothesourcePSaccessnetwork.Reference:23.401:GeneralPa
129、cketRadioService(GPRS)enhancementsforEvolvedUniversalTerrestrialRadioAccessNetwork(E-UTRAN)access;23.216:3rdGenerationPartnershipProject;TechnicalSpecificationGroupServicesandSystemAspects;SingleRadioVoiceCallContinuity(SRVCC)36.413:EvolvedUniversalTerrestrialRadioAccess(E-UTRA);S1ApplicationProtoco
130、l(S1AP).SRVCC流程GERAN/UMTSE-UTRANToGERAN/UMTSSRVCCprocedure:ForSRVCCfromE UTRANtoUTRAN/GERAN,MMEfirstreceivesthehandoverrequestfromE UTRANwiththeindicationthatthisisforSRVCChandling,andthentriggerstheSRVCCprocedurewiththeMSCServerenhancedwithSRVCCviatheSvreferencepointifMMEhasSRVCCSTN-SRinformationfo
131、rthisUE.MSCServerenhancedforSRVCCtheninitiatesthesessiontransferproceduretoIMSandcoordinatesitwiththeCShandoverproceduretothetargetcell.MSCServerenhancedforSRVCCthensendsPS-CShandoverResponsetoMME,whichincludesthenecessaryCSHOcommandinformationfortheUEtoaccesstheUTRAN/GERAN.Reference:23.401:GeneralP
132、acketRadioService(GPRS)enhancementsforEvolvedUniversalTerrestrialRadioAccessNetwork(E-UTRAN)access;23.216:3rdGenerationPartnershipProject;TechnicalSpecificationGroupServicesandSystemAspects;SingleRadioVoiceCallContinuity(SRVCC)36.413:EvolvedUniversalTerrestrialRadioAccess(E-UTRA);S1ApplicationProtoc
133、ol(S1AP).闭环功控流程1.ToupdateservingcellIBLERtargetaccordingtoOImessagefromneighbourcellsastoreduceinter-cellinterference.ThenewcellIBLERtargetwillbeconfigurednewUE.2.TosetTPCcommandbasedonIBLERmeasurementvalueandIBLERtargetvalue,astoassureexpectedIBLERleverl1.TosetTPCcommandbasedonSINRmeasurementvaluea
134、ndSINRtargetvalue,astoassureexpectedSINRleverl.TheSINRtargetvalueisupdatedaccordingtoouter-looppowercontrol.SINRmeasurementvaluediffersinDMRS/SRSmeasurement.闭环功控流程1.ToupdateservingUESINRtargetaccordingtoOImessagefromneighbourcellsorpowerheadroom,astoadaptetothediversechannelconditionandinter-cellint
135、erference.2.ToupdateandconfigNMAXvaluetoUEaccordingtoRBLERmeasurement.,astosaveRRCresource.GAP丈量配置流程GAPMeasurementprocedure:1.UeSendMeasmentReporttoeNodebtoindicateA2eventtrigged2.eNodeBJudgetheservingcellssignalbecomesbadandneedtotrigeInter-FreqorInter-RatMeasment(thereshouldbeInter-FreqInfoorInter
136、-RatFreqInfooftheservingcell)3.eNodeBsendRRCConnectionReconfigurationtoUE,whichcontaintheGapconfigandA4orB1Measmentconfig4.UEsendRRCConnectionReconfigurationCompletetoeNodeB,whichmeansGapconfigandA4orB1measmentconfigissuccessReference:36.331:EvolvedUniversalTerrestrialRadioAccess(E-UTRA);RadioResour
137、ceControl(RRC);Protocolspecification,5.5.2.9MeasurementgapconfigurationANR丈量配置流程ANRMeasurementprocedure:1.UeSendMeasmentReporttoeNodeBtoindicateA3orA4eventtrigged,andstrongestPCIisunknown(eg.thePCIbelongstoanothereNodeb)2.eNodeBsendanewMeasmenttocommandUEtoreporttheCGIoftheunknownPCI,andalongDRXcycl
138、emaybeneededforUEtoreadtheNCELLsSYSINFO3.UEreadstheNCELLsSIB1togettheNCELLsCGIandreportsittoeNodeb4.SRCeNodebsendRRCConnectionReconfigurationwhichcontainsHOcommandtoUE5.UErandomaccesstotheTareNodeb6.TareNodebmaysendnewMeasmentrequiretostoptheoldCGImeasmentReference:36.331:EvolvedUniversalTerrestrialRadioAccess(E-UTRA);RadioResourceControl(RRC);Protocolspecification,5.5.4Measurementreporttriggering
