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RANAP Protocol2

Chapter1OverallprotocolstructureforRANAPIuCSinterfaceprotocol.RadioAccessNetworkApplicationPart,(RANAP)isSS7userlayer.TheIuinterfaceisspecifiedattheboundarybetweentheUMTSTerrestrialRadioAccessNetwork(UTRAN)andtheCoreNetwork(CN).MSCisthefunctionalentityusedintheCSdomainoftheCN.ItisconnectedtotheUTRANthroughtheIuCSinterface.ItsinterfacerunsRANAPprotocol..IuCSinterfaceprotocolincludesControlPlaneItincludescontrolplanesignalingRANAPandSignalingBearerUserPlaneItincludesUserPlaneprotocolIuUPandDataBearerTransportNetworkControlPlaneItincludesdatabearercontrolsignalingALCAPandSignalingBearer

OverallprotocolstructureforRANAP.TheTS25.412SpecificationprovidestwoATMbasedsignalingbearermodes:BroadbandSS7(SAALNNI,MTP3B,SCCP)andIPbearerSS7(IP,SCTP,M3UA)..Fromthepointofviewoflayers,RANAPcanbedividedintotwoparts:radioaccessnetworkApplicationProtocolintheRadioNetworkLayer,usingRANAPprotocol(TS25.413),andtheSignalingBearer,residentintheTransportNetworkLayer.

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P O P U L A R P O S T S

RANAPProtocolChapter1OverallprotocolstructureforRANAP

IuCSinterfaceprotocol.RadioAccessNetworkApplicationPart,(RANAP)isSS7u...

WCDMACoreNetworkOverviewContentsChapter1CoreNetworkEvolution

DefinitionofCoreNetworkCNincludesaseriesofphysicalentitiestorealizeu...

WCDMACSbasicconceptionChapter1basicconceptionofsignalingnetwork

1.1WhatssignalingSignalingisthecontrolsignaltransferredbetweencommunicat...

SIGTRANprotocolChapter1overviewSIGTRANdefinition.Two

layersofprotocolsareincludedintheSIGTRANprotocolstack,i.e.,transmissionprotocol...

McInterfaceDataConfiguration

Chapter1BasicConceptsSection1McInterfaceIntroductionMcInterfaceIntroductionMediaGatewayControlMGC...

SCCPSignalingAnalysisandProcessChapter1General1.1LimitationofMTP

Transmission.Thesignalingpointcodeisnotthestandardinternationalcode,itiso...

MTPSignalingAnalysisandProcess

Chapter1OverviewofSS7BasicConceptDirectConnectionNetworkingQuasidirectconnectionnetworkingDifferencebet...

ISUPSignalingAnalysisandProcessCorrespondingRelationsofSS7withOSISeven

layerArchitectureISUPMessageFormatF:SignalUnitPeggingFlagCK:...

NetworkingAndInternetworkingDevicesNetworkingAndInternetworkingDevicesTwoor

moredevicesconnectedforthepurposeofsharingdataorresourcesarestationsonaNet...

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Chapter2RANAPmainfunctionandclassificationofmessage

2.1RANAPMainFunction.RANAPprotocolmainlycompletethefunctionsbetweenCNandRNCfollowingConnectionfoundation,backout,DatatransportationASN.1coding/decodingandmessagecheckingOverloadControlPagingResetandResetResourceSecurityModeControlMovingSubscriberResourceConfiguration.BesidesthefunctionsinfrontRANAPmoduladdsomecorrelatedcharacteristicofproduction.Itincludesbackuprearrangement,alarmcallingstatistictestingtraceandsoon.

2.2RANAPmessagecode/decodeRANAPmessageadoptsASN.1PERcode.Itsmassageneeddecodingtollstoanalysis.Thetypeofmessageisfixedinfronttwobytesofpositioninmessagecode.ThefollowingcodeexampleisRANAPmessageRelocationComplete0x000x0D0x400x030x000x000x000x00ThereintoThefirstbyte0x00denotesprocedureinitiatingmessageThesecondbyte0x0Ddenotesprocesscodeand0x0DdenotesRelocationCompleteprocedureAccordingtothefrontoftwobytesWecanjudgethatthemessageisRelocationCompletemessage.ARANAPmessageonlywithmessagetype,itsASN.1PERcodeis7byteswhichlikeslastexample.thelengthofRANAPmessagecannotlessthan7bytesafterASN.1PERcoding.

2.3ClassificationofRANAPmessage.Accordingtodifferentmessagetransportmodes,RANAPEPsareclassifiedinto:connectionorientedandconnectionless..TheformerissupportedbyaUEspecificsignalingconnectionfortransportthelatterissupportedbyacommonsignalingconnectionfortransport.AllotherproceduresuseconnectionorientedservicetotransportexceptthatReset,ResetResource,OverloadControl,andPaginguseSCCPconnectionlessserviceandErrorIndicationbasestheactualconditionstomakeadeterminationbetweentheconnectionlessserviceandtheconnectionorientedservice..ConnectionorientedmessagesareonesbetweenaspecificUEandthenetwork,suchasUElocationupdateprocedureandcallprocedure.ConnectionlessmessagesareonespertainingtosystemmaintenanceandadministrationandaffectpartorallofUEusers.MostofRANAPconnectionlessmessagemaybeupordown(exceptPAGING).Mostofconnectionorientedmessagesareunidirectional(exceptERRORINDICATIONandDIRECTTRANSFER).

Chapter3RANAPelementaryprocedures

3.1ClassificationofRANAPElementaryProcedures.Accordingtodifferentresponsetypes,RANAPEPsaredividedintoClasses1,2and3.CLASS1ElementaryProcedureswithresponse(success/orfailure).ForClass1EPs,Successfulmeansasignalingmessageexplicitlyindicatesthattheelementaryproceduresuccessfullycompletedwiththereceiptoftheresponse.UnsuccessfulmeansasignalingmessageexplicitlyindicatesthattheEPfailedorontimesupervisionexpiry.

NetworkPlanning

1.IntroductiontoGSMNetworkGSMSystemArchitectureGSMBandwidthGSM900andGSM1800aretwins...

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CoreNetwork(8)

D A T A C O M

GSMSystem(1)Telecom(1)

Datacom(5)

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CLASS2ElementaryProcedureswithoutresponse.Class2EPsareconsideredalwayssuccessful.CLASS3ElementaryProcedureswithpossibilityofmultipleresponses.Class3EPshaveseveralresponsemessages.ClassificationofRANAPElementaryProcedures

1.Class1withresponse

2.Class2withoutresponse

3.Class3withpossibilityofmultipleresponses

3.2DescriptionofRANAPElementaryProceduresRABAssignment.RABAssignment(RadioAccessBearerAssignment)RABassignmentisinitiatedbytheCN.ButtheCNonlydeterminesanRABIDvalueandconcernedRABparameters.TheRNCexecutestherequest,allocatesuserplaneresources,andreportstotheCNtheoutcomeoftheprocedureinoneormoreresponses.Theelementaryprocedurewithresponseisconnectionoriented.

RABReleaseRequest.RABReleaseRequestTheRNCusesthisproceduretorequesttheCNtoreleaseconcernedRABresources.Theelementaryprocedurewithoutresponseisconnectionoriented.Whenafailureoccurringtothe

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correspondinguserplaneresourceofRABIDisfoundattheRNC,theRNCinitiatesanRABreleaserequestmessagetotheCNinnormalcases.

IuReleaseRequest.IuReleaseRequestThisprocedureisusedbytheRNCtorequesttheCNtoreleasetheIuconnectionforaparticularUE.ItisduetosomeUTRANgeneratedreason,e.g.O&MIntervention,UserInactivity,RadioConnectionWithUELost",etc.TheIuReleaseRequestprocedurewithoutresponseisconnectionoriented.

IuRelease.IuReleaseThepurposeoftheIuReleaseprocedureistoenabletheCNtoreleasetheIuconnectionandallUTRANresourcesrelatedonlytothatIuconnectiontobereleased.Theprocedurewithresponseisconnectionoriented.TheprocedureisinitiatedbytheCNforatleastthefollowingreasons:.CompletionoftransactionbetweenUEandCN.ReceptionofIuReleaseRequestmessagebyCN.CompletionofrelocationofSRNS.

Paging.PagingThepurposeofthisprocedureistoenabletheCNtosendapagingmessagetoaparticularUE.Theprocedurewithoutresponseisconnectionless.WhentheUEisidle,pagingisperformedviaacommonpagingchannelwhentheUEhasalreadyhadaRadioResourceControl(RRC)connection,pagingisperformedviaitsdedicatedRRCconnection.

CommonID

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.CommonIDThisprocedureisused,afteranRRCconnectionisestablishedfortheUE,tocreateareferencebetweenacommonidentityoftheUE(e.g.IMSI)andtheRRCconnectionandstoreitintheRNC,sothatsubsequentpagingmessagescanbetransportedthroughtheRRCconnection.Theprocedurewithoutresponseisconnectionoriented.

SecurityModeControl.SecurityModeControlThisprocedureisusedbytheCNtopasscipherandintegritymodeinformationtotheUTRAN.TheUTRANusesthesealgorithmsduringthesubsequentRABconnectionestablishment,relocation,etc.procedures.Thisprocedurewithresponseisconnectionoriented.

UELocationReportingControl.UELocationReportingControlThisprocedureisusedbytheCNtorequesttheRNCtoprovideinformationonthelocationofagivenUE.Thecontrolparametermaybeofdirectreporttype,changereporttypeorstopreporttype.Theprocedurewithoutresponseisconnectionoriented.

UELocationReportUELocationReportThisprocedureisusedbytheRNCtoreporttheUE'slocationinformationtotheCN.ThereportiscontrolledbytheLOCATIONREPORTINGCONTROLmessage.Theprocedurewithoutresponseisconnectionoriented.

InitialUEMessage.InitialUEMessageThisprocedureisusedbytheRNCtotransparentlytransfertotheCNtheradiointerfaceinitialmessage(NASPDU)ofthethirdlayerfromtheUEwhenanIusignalingconnectionisestablishedbytheRNC.Theprocedurewithoutresponseisconnectionoriented.

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DirectTransfer.DirectTransferThisprocedureisusedtotransparentlycarryUECNsignalingmessagesbytheUTRANovertheIuinterface.TheRNCdoesnotperformanyoperationsonthem.TheUECNsignalingmessagesaretransportedasaparameterintheDIRECTTRANSFERmessagemessages.Thisprocedurewithoutresponseisconnectionoriented.

OverloadControl.OverloadControlThisprocedureisinitiatedbyeithertheRNCortheCNincasethatsignalingoverloadhappensatitsside.Theotherpartyperformsoverloadcontrolaccordingtoacertainalgorithm.ThepurposetodosoistoappropriatelyreducethetrafficprocessedbytheRNCortheCN,soastoensurethenormaloperationofthesystem.Theprocedurewithoutresponseisconnectionless.

Reset.Reset:isdesignedforalltransactionsontheIuinterfaceattheRNCortheCN.Afterreset,allcallconnections(alreadyestablishedorbeingestablished)willbereleased.CallmessagesfromtheUEwillnotbeacceptedduringtheresetprotectiontime.Theprocedurewithresponseisconnectionless.

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ErrorIndication.ErrorIndicationTheErrorIndicationprocedureisinitiatedbyanodetoreportdetectederrorsinoneincomingmessage,providedtheycannotbereportedbyanappropriatefailuremessage.Iftheerrorsituationarisesduetoreceptionofamessageutilizingdedicatedsignaling,thentheErrorIndicationprocedurewithoutresponseusesconnectionorientedsignaling.Otherwisetheprocedurewithoutresponseusesconnectionlesssignaling.

RelocationofSRNS.RelocationofSRNSThisprocedureisusedtorelocatetheServingRNS(SRNS)fromoneRNStoanother.Thisprocedurecanbedividedintoseveralstages:RelocationPreparation,RelocationResourceAllocation,RelocationDetectandRelocationComplete.Inaddition,RelocationCancelisalsoincluded.

3.3MainProceduresofRANAP

IuCSInterfaceLocationProcedure.IuCSinterfacelocationprocedureThelocationupdateprocedureisconnectionoriented.Purposesofthelocationupdateprocedureare:InsertintheVLRthesubscriptioninformationoftheUEintheHLR:Anexampleissubscribedservices(telecommunicationservices,supplementaryservices).LocationupdateisthepremisefortheUEtoactasthecallingpartyorthecalledparty.NomattertheUEisthecallingorcalledparty,VLRmustcontainthisusersdata:whetheracertainservice(e.g.SMS)issubscribed,whetherasupplementaryservicesuchascallforwardingisregistered/activated,andsoon.WhentheUEisthecalledparty,MSC/VLRpreservesitsLAIsoastosendpagingmessages.HLRpreservestheUEresidentMSC/VLRnumbersothatroamingnumbercanbeobtained.

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IuCSinterfacemobilecallingprocedure.IuCSinterfacemobilecallingprocedure:TheinitialmessagefortheUEtooriginateacalliscontainedintheNASPDUoftheINITIALUEmessageAftertheIuinterfaceconnectionisestablished,theCNcaninitiatetheCommonIDprocedureforpagingcoordinationTheCNjudgeswhethertheUEisentitledtoaccess.IftheUEisentitled,allowanceisshownbytriggeringtheAuthentication/EncryptionprocedureorDirectTransfer(Cmserviceaccept)isdirectlysent.Otherwise,theCNinitiatestheIuReleaseprocedureThecallednumbercontainedintheDirectTransfer(Setup)messageissenttotheCN.Afternumberanalysis,theCNdeterminesthenatureofthecall:outgoingcalltoPSTNorlocalofficecall,etc.Afterthecallednumberissuccessfullyanalyzed,theCNsendsCALLPROCEEDINGandstartstheRABAssignmentprocedure.Afterthecalledpartyhearsringingtone,theCNsendsanALERTINGmessagetotheUE.Afterthecalledpartyhooksoff,theCNsendsaCONNECTmessagetotheUE.UponreceiptoftheCONNECTmessage,theUEsendsaCONNECTACKmessage.Thecallisconnected.IfthecallisterminatedbythecallingUE,thecallingUEsendsaDISCONNECTmessagetotheCN.Ifthecalledpartyhooksonfirst,theCNsendsaDISCONNECTmessagetothecallingUE.

IuCSinterfacemobilecalledprocedure.IuCSinterfacemobilecalledprocedure:TheCNanalyzeswhetherornotthecalledpartyresidentUEiswithinitsscope.IftheUEis,theCNsendsaconnectionlessPAGINGmessage.Whenamessageindicatingtopageitselfisfound,theUEoriginatesconnectionsetupwithaPAGINGRESPONSEmessagebyusingtheRNCTheCNcaninitiatetheCommonIDproceduretosupportRNCpagingcoordinationTheCNsendsaSETUPmessagecontainingthecallingnumber(iftheUEisentitledtoCLIPservice).UponreceiptoftheCALLCONFIRMEDmessagefromtheUE,theCNstartstheRABAssignmentprocedure

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.Afterthecalledpartyhearsringingtone,theUEsendsanALERTINGmessagetotheCN.Thecalledpartyhooksoff,theUEsendsaCONNECTmessagetotheCN.TheCNreturnsaCONNECTACKmessage.Thecallisconnected.Themessageflowaboutonhookisthesameasthatofthemobilecallingprocedure.

SwitchingprocedurebetweenRNCsinthesameCN.SwitchingprocedurebetweenRNCsinthesameCNInfigure,solidlinesrepresentnormalswitchingproceduresanddottedlinesrepresentabnormalprocedures.Afterasuccessfulswitch,theCNshallinitiatetheIuReleaseproceduretothesourceside.IftheCNfailstoinitiatetheIuReleaseproceduretotheRNCbeforethetimerexpires,thesourceRNCshallactivelyinitiatetheIuReleaseRequest.

ResourceallocationfailureprocedureabouttargetRNCrelocation.ResourceallocationfailureprocedureabouttargetRNCrelocationOnceresourceallocationforrelocatingthetargetRNCfails,thetargetRNCsendsaRELOCATIONFAILUREmessagetotheCNUponreceiptofthemessagebytheCN,theCNsendsaRELOCATIONPREPFAILUREmessagetothesourceRNCTheIuconnectionforrelocatingthetargetRNCisreleased.Thecallcontinuestobeheldatthesourceside.

Relocationcancelprocedurebysourcesideactively.RelocationcancelprocedurebysourcesideactivelyRelocationCancelmaytakeplaceduringoraftertheRelocationPreparationprocedure.Inotherwords,RELOCATIONCANCELmessagemaybesentbeforetheRELOCATIONCOMMANDfromtheCNisreceived,orbesentbytheRNCaftertheCNhassentaRELOCATIONCOMMANDmessage

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ISUP SignalingAnalysis andProcess

MTP SignalingAnalysis andProcess

WCDMA-CSbasicconception

RANAP Protocol SCCP SignalingAnalysis andProcess

Mc InterfaceDataConfiguration

SIGTRANprotocol

AfterthesourceRNChasinitiatedtheRelocationRequiredprocedure,asuccessiveinitiationoftheRelocationRequiredprocedurecannotbedoneiftheRELOCATIONCANCELorRELOCATIONCOMMANDmessagefromtheCNisnotreceived.

Chapter4RANAPcorrelateddataconfigurationRANAPcorrelateddataconfiguration.RANAPprotocolrunsbetweenSoftX3000andRNC.ItmaynotonlybearonATMbutalsoonIP.ItrunsQAAL2protocolbetweenMGWandRNC..Now,DataoftentransfersthroughMGWinnetapplicationSignalingbetweenSoftX3000andMGWistransportedwithIPbearerandittransportswithATMbearerbetweenMGWandRNC.ThestepofdataconfigurationfromMSCtoRNCBasedonIP

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