GSM信令流程講解

SignalProcessCallProcess(innetwork)Roaming(locationupdate)BaseTransceiverStation(BTS)BaseStationController(BSC)MSVisitorLocationRegister(VLR)HomeLocationRegister(HLR)MobileSwitchingCentre(MSC)PublicSwitchedTelephoneNetwork(PSTN)Iamnewinthisarea(TMSIandoldLAI)MSdetected(TMSIandoldLAI)MSdetected(TMSI)OK(IMSI)OKWelcome(newTMSIandnewLAI)VisitorLocationRegister(VLR)YourMSisinmyareaOK,hereisthesubscriberdataVLRorHLRstoresMSRN(MSRoamingNo.)VLRstoresLAI(LocationAreaIdentity)HLRstoresVLRforMSVLRstoressubscriberdata)))(((IncomingcallBaseTransceiverStation(BTS)BaseStationController(BSC)MSMobileSwitchingCentre(MSC)PSTNVisitorLocationRegister(VLR)GatewayMSC(GMSC)PSTNHomeLocationRegister(HLR)PagingTMSICallforMSRNCallforMSRNCallforMSISDNWhereisMSISDN?GetmeMSRNforMSISDNMSRNMSRNCanIuseacontrolchannel?UsethiscontrolchannelUsethistrafficchannelAnswerAnswer)))(((OutgoingcallfromMSBaseTransceiverStation(BTS)BaseStationController(BSC)MSMobileSwitchingCentre(MSC)PublicSwitchedTelephoneNetwork(PSTN)VisitorLocationRegister(VLR)CanImakeacall?OK,usethiscontrolchannelIneedservicexx(incl.tel.no.)(TMSI)CanMSuseservicexx?YesOK,andhereisatrafficchannelFirstaddressmessage)))(((Inter-MSChandoverBTSAMSBSCAMSCAVLRAPSTNBTSBBSCBMSCBVLRBBTSBisbetterHandoverrequiredHandoverrequiredHandoverrequiredOK(radiochannel)MSRN?MSRNOK(MSRNandradiochannel)AllocationoftrafficchannelHandover(radiochannel)OK)))((()))(((UseofChannel(inUm)Useofchannels-roamingBaseTransceiverStation(BTS)MSBCCH(LAI)RACH(canIgetacontrolchannel?)AGCH(usethisSDCCH)SDCCH(roaming;oldLAIandTMSI)SDCCH(newLAIandnewTMSI))))(((Useofchannels-outgoingcallBaseTransceiverStation(BTS)MSRACH(canIgetacontrolchannel?)AGCH(usethisSDCCH)SDCCH(servicerequest)SDCCH(OK))))(((SDCCH(calledno.)Useofchannels-incomingcallBaseTransceiverStation(BTS)MSPCH(paging)RACH(canIgetacontrolchannel?)AGCH(usethisSDCCH)SDCCH(pagingresponse-TMSI))))(((Useofchannels-handoverBaseTransceiverStation(BTS)MSSACCH(measurementreport)FACCH(handovercommand)FACCH(handovercomplete))))(((SignalProcess(BSS)MSBSCChannelactivationackChannelactivationEncryptioncommandChannelrequiredCompleteLayer3Info.AuthenticationrequestCallproceedingCipherModeCompleteSABM(cm_serv_req)ImmediateassigncommandestablishindicationBTSChannelrequestUA(cm_serv_req)CipherModeCommandImmediateassignmentMSCAuthenticationresponseSetupCipherModeCommandCipherModeCompleteOutgoingcall(Tobecontinued)MSBSCBTSMSCAssignmentRequestChannelactivationackAssignmentcommandestablishindicationAssignmentCompleteAssignmentCompleteDeactivateSACCHReleaserequestReleaseconfirmRFChannlereleaseRFChannelreleaseackAlertingConnectConnectacknowledgeSABMUAChannelactivationOutgoingcall(Tobecontinued)MSBSCBTSMSCChannelReleaseReleaseCompleteReleaseClearCommandRFChannlereleaseDISCDeactivateSACCHRFChannelreleaseackReleaseIndicationUADisconnectClearCompleteOutgoingcall(End)MSBSCBTSMSCChannelactivationackChannelactivationEncryptioncommandChannelrequiredCompleteLayer3Info.AuthenticationrequestCallconfirmCipherModeCompleteSABM(pag_resp)ImmediateassigncommandestablishindicationChannelrequestUA(pag_resp)CipherModeCommandImmediateassignmentAuthenticationresponseSetupCipherModeCommandCipherModeCompletePagingCommandPagingRequestPagingImcomingcall(Tobecontinued)MSBSCBTSMSCAssignmentRequestChannelactivationackAssignmentcommandestablishindicationAssignmentCompleteAssignmentCompleteDeactivateSACCHReleaserequestReleaseconfirmRFChannlereleaseRFChannelreleaseackAlertingConnectConnectacknowledgeSABMUAChannelactivationIncomingcall(End)MSBSCChannelactivationackChannelactivationEncryptioncommandChannelrequiredCompleteLayer3Info.AuthenticationrequestTMSIreallocationcompleteCipherModeCompleteSABM(loc_upd_req)ImmediateassigncommandestablishindicationBTSChannelrequestUA(loc_upd_req)CipherModeCommandImmediateassignmentMSCAuthenticationresponseLocationupdatingacceptCipherModeCommandCipherModeCompleteLocationupdate(Tobecontinued)MSBSCBTSMSCChannelReleaseClearCommandRFChannlereleaseDISCDeactivateSACCHRFChannelreleaseackReleaseIndicationUAClearCompleteLocationupdate(End)MSBSCBTS1BTS2ChannelactivationChannelactivationackMeasurementresultHandovercommandMeasurementreportHandoveraccessHandovercompleteSABMUAHandovercompleteHandoverperformed(tomsc)PhysicalinformationestablishindicationHandoverdetectionI