无线接口信令协议

无线接口信令协议第一页，共五十二页，2022年，8月28日2Um接口信令第二页，共五十二页，2022年，8月28日3GSM系统专用协议群DTAPDTAPDirectTransferApplicationPartBSSMAPBSSManagementApplicationPartCMCallManagementMMMobileManagementRRRadioResourceManagementSCCPSignallingConnectionControlPartMAPMobileApplicationPartTCAPTransactionCapabilityApplicationPartISUPISDNUserPartMTPMessageTransferPartCMMMRRSig.layer2Layer1(air)Sig.layer2Sig.layer1MTPSCCPBSSMAPRR(CM+MM)MSBSCMTPMTPSCCPSCCPCMMMBSSMAPTCAPMAPISUPMSCSig.layer2Layer1(air)BTS(CM)(MM)(RR)(CM)(MM)(RR)(CM)(MM)(LAPDm)(LAPDm)(LAPD)Sig.layer2Sig.layer1(LAPD)BTSMBTSMRR'BTSMBTSManagementUmInterfaceAbisInterfaceA-interfaceInter-MSCInterface第三页，共五十二页，2022年，8月28日4ChannelRequestEstablishmentCause emergencycall Callre-establishLocationupdateAnswertopaging:sameaschannelneededinPagingNECI=0:MO&procedurebecompletewithSDCCHNECI=1:MOTCH/F ProcedurebecompletewithSDCCHRandomReference立即指配流程MSBSSCHANNELREQUEST(1)IMMEDIATEASSIGNMENT(EXTENDED)ImmediateAssignmentL2Pseudolength ProtocoldiscriminatorSkipindicationMessagetypeN(SD)forMSsidePagemode ChanneldescriptionRandomreference TimingadvanceMobileallocation StartingtimeIArestoctetsT3126MMRRCHANNELREQUEST(2~M+1)IMMEDIATEASSIGNMENTREJECTSABM(L3)(1)UA(L3)SABM(L3)(2~6)ProtocoldiscriminatorCallcontrol;callrelatedSSmessagesMobilitymanagementmessagesRadioresourcemanagementmessagesSkipindicationOtherthan0shouldbeignorePagemodeNormalpagingExtendedpagingPagingreorganizationSameasbeforeChanneldescriptionChanneltypeandTDMAoffsetSDCCH/8+SACCH/8+subchannelSDCCH/4+SACCH/4+subchannelTCH/F+ACCHTN TSCHoppingchannelsinglechannel:ARFCNRFhoppingchannel:HSN+MAIORequestreferenceRandomAccessInformationT1’/T2/T3——>FNT1’=(FN/1326)mod32T2=(FN)mod26T3=(FN)mod51(FN)mod42432=51x((T3-T2)mod26)+T3+51x26xT1’MobileallocationIndexforCAStartingtimeT1’/T2/T3IArestoctetsMAIO+Mobileallocation(frequencyparametersbeforetime)ImmediateAssignmentExtendedPagemode Channeldescription1Randomreference1 Timingadvance1Channeldescription2 Requestreference2Timingadvance2 MobileallocationStartingtime IArestoctetsImmediateAssignmentRejectPagemode Randomreference1 WaitingIndication1Randomreference2 WaitingIndication2Randomreference3 WaitingIndication3Randomreference4 WaitingIndication4WaitingIndicationT3122:0~255secondS~S+T-10~max(8,T)-1T3101T200:235msMM要求进入专有模式RR响应寻呼允许接入网络T3122T3126:T+2S~5secondRACHRACHAGCHAGCHSDCCHSDCCHSDCCH第四页，共五十二页，2022年，8月28日5PagingRequestType1PagingmodeChannelneededformobile1Mobileidentity1(IMSI/TMSI)Channelneededformobile2Mobileidentity2(IMSI/TMSI)寻呼流程MSBSSPAGINGREQUESTTYPE1/2/3PAGINGREQUESTTYPE1/2/3CHANNELREQUESTIMMEDIATEASSIGNMENT(EXTENDED)SABM(Pagingresponse)UA(Pagingresponse)PagingRequestType2PagingmodeChannelneededformobile1Mobileidentity1(TMSI)Channelneededformobile2Mobileidentity2(TMSI)Channelneededformobile3Mobileidentity3(IMSI/TMSI)PagingRequestType3PagingmodeChannelneededformobile1Mobileidentity1(TMSI)Channelneededformobile2Mobileidentity2(TMSI)Channelneededformobile3Mobileidentity3(TMSI)Channelneededformobile4Mobileidentity4(TMSI)PCHPCHAGCHAGCHSDCCHSDCCHT3113PagingResponseCipheringkeysequenceMobilestationclassmark2MSidentity(IMSI/TMSI)ClassmarkInformation2Phase1/Phase2MSControlledEarlyClassmarkSendingRFPowerCapabilityPseudoSynchronizationCapabilitySupplementaryServiceScreeningIndicationMTSMSpt.Topt.CapabilityFrequencyCapability(GSM900Extended?)A5/1;A5.2;A5/3Classmark3第五页，共五十二页，2022年，8月28日6MeasurementreportBA-usedDTX-usedMeas-validRxlev_full/sub(servingcell)Rxqual_full/sub(servingcell)NO-NCELL-MRxlev(neighborcell1~6)BCCH-Freq-Ncell(1~6)BSIC-Ncell(1~6)SACCH流程MSBSSSYSTEMINFORMATION5/5bis/5ter/6MEASUREMENTREPORTSACCHDownlinkL1HeaderOrderedMSpowerlevelOrderedtimingadvanceSACCHUplinkL1HeaderActualMSpowerlevelActualtimingadvanceSYSTEMINFORMATION5/5bis/5ter/6MEASUREMENTREPORTSACCHSACCHSACCHSACCH第六页，共五十二页，2022年，8月28日7ASSIGNMENTCOMMANDChanneldescriptionPowercommandCellchanneldescriptionStartingtimeMobileallocation(aftertime)Mobileallocation(beforetime)Channelmode指配流程MSBSSASSIGNMENTCOMMANDASSIGNMENTFAILUREUASABM(1)SDCCHSDCCHFACCHFACCHASSIGNMENTCOMPLETESABM(2~6)ASSIGNMENTFAILURET3107FACCHFACCHSDCCHASSIGNMENTCOMPLETEASSIGNMENTFAILURERRCauseRRCauseNormalevent Abnormalrelease,unspecifiedAbnormalrelease,channelunacceptable Abnormalrelease,timerexpiredAbnormalrelease,noactivityonradiopath PreemptivereleaseHandoverimpossible,timingadvanceoutofrangeChannelmodeunacceptable FrequencynotimplementedCallalreadycleared SemanticallyincorrectmessageInvalidmandatoryinformation Messagetypenon-existentornotimplementedMessagetypenotcompatiblewithprotocolstateConditionalIEerror NocellallocationavailableProtocolerrorunspecifiedChannelmodeSignallingonly Speechfullrateversion1Speechfullrateversion2 Data,14.5kbpsradiointerfacerateData,14.5kbpsradiointerfacerate Data,12.0kbpsradiointerfacerateData,6.0kbpsradiointerfacerate Data,3.6kbpsradiointerfacerate第七页，共五十二页，2022年，8月28日8HANDOVERCommandCelldescriptionChanneldescriptionHandoverreferencePowercommandandaccesstypeCellchanneldescriptionMobileallocation(aftertime)ChannelmodeTimingAdvanceSynchronizationindication(伪/预)同步切换流程MSBSSHANDOVERCOMMANDSDCCH/FACCHSABMT3103CellDescriptionBCCHARFCNBCCNCC BSSHANDOVERACCESSHANDOVERACCESSHANDOVERACCESSHANDOVERACCESSSABMUAHANDOVERCOMPLETEHANDOVERFAILURESDCCH/FACCHSDCCH/FACCHSDCCH/FACCHSDCCH/FACCHSDCCH/FACCHSDCCH/FACCHSDCCH/FACCHSDCCH/FACCHSDCCH/FACCHPowerCommandandAccessTypePowerlevelAccesstypecontrol:SendingHandoveraccessismandatoryoroptional

SynchronizationIndicationReportobservedtimingdifference:shallbeincludeinHandovercompleteornot OTD=RTD+t1-t0Synchronizationindication:non-synchronizedsynchronizedpre-synchronizedpseudo-synchronizedNormalcellindication:TA>63isignoredTA>63triggedhandoverfailure HANDOVERFailure/CompleteRRCauseMobileobservedtimedifferenceRRCauseNormaleventProtocolerrorunspecifiedHandoverimpossible,timingadvanceoutofrangeChannelmodeunacceptable FrequencynotimplementedHANDOVERFAILUREUA第八页，共五十二页，2022年，8月28日9HANDOVERCommandCelldescriptionChanneldescriptionHandoverreferencePowercommandandaccesstypeCellchanneldescriptionMobileallocation(aftertime)ChannelmodeTimingAdvanceSynchronizationindication非同步切换流程MSBSSHANDOVERCOMMANDSDCCH/FACCHSABMT3103BSSHANDOVERACCESS(1)HANDOVERACCESS(n)SABMUAHANDOVERCOMPLETEHANDOVERFAILURESDCCH/FACCHSDCCH/FACCHSDCCH/FACCHSDCCH/FACCHSDCCH/FACCHSDCCH/FACCHSDCCH/FACCHSDCCH/FACCHSDCCH/FACCHPhysicalInformationTAPHYSICALINFORMATION(1)PHYSICALINFORMATION(2~Ny1)T3105T3124:675ms(SDCCH),320ms(TCH)HANDOVERFAILUREUASDCCH/FACCHSDCCH/FACCH第九页，共五十二页，2022年，8月28日10连接释放流程MSBSSCHANNELRELEASE(DEACTIVESACCH)DISCUASDCCH/FACCHSDCCH/FACCHSDCCH/FACCHSDCCH/FACCHDISC(2~6)T3109ChannelReleaseRRCauseBArangeT3110:>240~470msT3111=T3110RRCauseNormalevent Abnormalrelease,unspecifiedAbnormalrelease,channelunacceptable Abnormalrelease,timerexpiredAbnormalrelease,noactivityonradiopath PreemptivereleaseNocellallocatedavailableProtocolerrorunspecified第十页，共五十二页，2022年，8月28日11FrequencyRedifinitionChanneldescriptionMobileallocationStartingtimeCellchanneldescription无线资源管理其他流程MSBSSFREQUENCYREDEFINITIONRRSTATUSCHANNELMODEMODIFYSDCCH/FACCHSDCCH/FACCHSDCCH/FACCHSDCCH/FACCHCHANNELMODEMODIFYACKCIPHERINGMODECOMPLETESDCCH/FACCHSDCCH/FACCHSDCCH/FACCHCipherModeSettingA5/0~A5/7CIPHERINGMODECOMMANDCLASSMARKENQUIRYCLASSMARKCHANGERRStatusRRcauseChannelModeModify(ACK)ChanneldescriptionChannelmodeCipherResponseIMEISV(IMEI+SoftwareVersion)shallbeincludedornotClassmarkInformation2Phase1/Phase2MSControlledEarlyClassmarkSendingRFPowerCapabilityPseudoSynchronizationCapabilitySupplementaryServiceScreeningIndicationMTSMSpt.Topt.CapabilityFrequencyCapability(GSM900Extended?)A5/1;A5.2;A5/3Classmark3ClassmarkInformation3Multi-bandssupported,E-GSM/DCS1800/R-GSMRFPowerCapabilityforeachbandA5/4,A5/5,A5/6,A5/7UCS2CIPHERINGMODECOMMANDCiphermodesettingCipherresponseCipheringModeCompleteIMEISVClassmarkChangeClassmark2Classmark3第十一页，共五十二页，2022年，8月28日12TMSI重分配流程MSBSSTMSIREALLOCATIONCOMMANDTMSIREALLOCATIONCOMPLETESDCCH/FACCHSDCCH/FACCHT3250TMSIReallocationCommandLAI=MCC+MNC+LACTMSI第十二页，共五十二页，2022年，8月28日13鉴权流程MSBSSAUTHENTICATIONREQUESTAUTHENTICATIONRESPONSESDCCH/FACCHSDCCH/FACCHT3260:12sAuthenticationRequestCipheringkeysequencenumber:0~6AuthenticationparameterRAND:128bitsAuthenticationResponseAuthenticationparameterSRES:32bitsAUTHENTICATIONREJECTT3240:10sSDCCH/FACCHIDLE(NoIMSI,roamingnotallowed)第十三页，共五十二页，2022年，8月28日14身份确认流程MSBSSIDENTITYREQUESTIDENTITYRESPONSESDCCH/FACCHSDCCH/FACCHT3270:12sIdentityRequestIdentitytype:IMSI/IMEI/TMSI/IMEISVIdentityResponseMobileIdentity第十四页，共五十二页，2022年，8月28日15IMSI分离流程MSBSSIMSIDETACHINDICATIONSDCCH/FACCHT3220:5sIMSIDetachIndicationMobilestationclassmark1MobileIdentityMobileStationClassmark1Phase1/Phase2MSControlledEarlyClassmarkSendingRFPowerCapabilityA5/1;第十五页，共五十二页，2022年，8月28日16AbortRejectcause移动管理其他流程MSBSSABORTSDCCH/FACCHMMInformationFullnamefornetworkShortnamefornetworkNetworktimezoneNetworktimeandtimezoneRejectCauseIllegalMSNetworkfailureIDLE(ifillegalMS,NoIMSI,roamingnotallowed)MMINFORMATIONMMSTATUSMMStatusRejectcauseRejectCauseMessagetypenon-existentornotimplemented第十六页，共五十二页，2022年，8月28日17位置更新流程MSBSSLOCATIONUPDATEREQUEST(1)SDCCH/FACCHSDCCH/FACCHLocationUpdateRequestLocationupdatetypeCipheringkeysequencenumberLocationareaidentificationMobileStationclassmark1MobileidentityLocationUpdateTypeLUT: Normallocationupdate Periodlocationupdate IMSIattachFOR: (no)follow-onrequestpendingLOCATIONUPDATEACCEPTT3212SDCCH/FACCHIDLE(NoIMSI,roamingnotallowed)LOCATIONUPDATEREJECTLOCATIONUPDATEREQUEST(2)LocationUpdateAcceptLocationareaidentificationMobileidentityFollow-onproceedLocationUpdateRejectRejectcauseT3210:20sLOCATIONUPDATEREQUESTT3211:15sTMSIREALLOCATIONCOMPLETET3250:12sT3240:10s(waitforRRrelease)LOCATIONUPDATEREQUEST(3~4)RejectCauseIMSIunknowninHLR IllegalMSIllegalME PLMNnotallowedLocationAreanotallowedRoamingnotallowedinthislocationareaMandatoryinformationelementerror Protocolerror,unspecifiedInformationelementnotexistornotimplementedConditionalIEerror

第十七页，共五十二页，2022年，8月28日18移动管理连接建立流程MSBSSSABM(CMSERVICE/RE-ESTREQUEST1)CMServiceRequestCMservicetypeCipheringkeysequencenumberMobilestationclassmark2MobileidentityUA(CMSERVICE/RE-ESTREQUEST)T3230:15sCMSERVICEACCEPTT3240:10s(waitforRRrelease)SABM(CMSERVICE/RE-ESTREQUEST2~4)RejectCauseIMSIunknowninVLRIllegalME NetworkfailureCongestionServiceoptionnotsupportedRequestedserviceoptionnotsubscribedServiceoptiontemporarilyoutoforderCMSERVICEREJECTCMServiceTypeMobileoriginatingcallestablishmentEmergencycallestablishmentShortmessageserviceSupplementaryserviceactivationCMSERVICEABORTAUTHENTICATIONREQUESTCMRe-establishmentRequestCipheringkeysequencenumberMobilestationclassmark2MobileidentityLocationareaidentificationCMServiceRejectRejectcause第十八页，共五十二页，2022年，8月28日19EmergencySetupProtocolDiscriminatorTransactionIdentifierMessageType--N(SD)forMSSideBearercapability移动主叫呼叫建立流程MSBSSCMSERVICE/RE-ESTREQUESTSetupBearercapabilityFacility(onlyusedforSS)CalledpartyBCDnumberSSversionCLIRsuppressionCLIRinvocationCallcontrolcapability (DTMFsupport)T303:30sCMSERVICEACCEPTSETUP/EMERGENCYSETUPBearercapabilityInformationtransfercapability:Speech Data Facsimilegroup3Alternatespeech/facsimilegroup3,speechstartTransfermode:Circuitmode/PacketmodeCodingstandard:GSMstandardizedCodingRadiochannelrequirement:Fullrate/Dualrate,fullrateprefer/Dualrate,halfratepreferSpeechversionindication:FR/EFR/HRallsupportedbeincludedinorderofpreferenceCALLPROCEEDINGALERTINGRELEASECOMPLETEDISCONNECTCONNECTCONNECTACKCallProceeding/Alerting/ConnectFacilityProgressindicatorReleaseComplete/DisconnectCauseFacilitySSversionProgressindicatorCodingstardard:StandarddefinedfortheGSMßPLMNSasdescribedbelowLocation:PrivatenetworkservingthelocaluserPublicnetworkservingthelocaluserPublicnetworkservingtheremoteuserPrivatenetworkservingtheremoteuserNetworkbeyondinterworkingpointProgressdescription: Callisnotend-to-endPLMN/ISDN,furthercallprogressinformation maybeavailablein-bandDestinationaddressinnon-PLMN/ISDNOriginationaddressinnon-PLMN/ISDNCallhasreturnedtothePLMN/ISDNIn-bandinformationorappropriatepatternnowavailableCallisend-to-endPLMN/ISDNQueueingUnspecific

CauseCodingstandard:sameasProgressindicatorLocation:sameasProgressindicatorCausevaluenormaleventclass1normaleventclass2resourceunavailableserviceoroptionnotavailableserviceoroptionnotimplementedinvalidmessage(e.g.parameteroutofrange)protocolerror(e.g.unknownmessage)interworkingT310:30sT313:30sT313DISCONNECTTransactionIdentifyTIflag: 0--messageissendfromthesidethatoriginatestheTI 1--messageissendtothesidethatoriginatestheTITIvalue:0~6,givenPD,givenSAP,distinguishdifferentmessageflow第十九页，共五十二页，2022年，8月28日20移动被叫呼叫建立流程MSBSSPAGINGRESPONSESetupBearercapabilityFacility(onlyusedforSS)CallingpartyBCDnumberProgressindicatorSignalSETUPRELEASECOMPLETESignaldialtoneonringbacktoneonintercepttoneonnetworkcongestiontoneonbusytoneonconfirmtoneonanswertoneoncallwaitingtoneonoff-hookwarningtoneontonesoff alertingoffDISCONNECTCONNECTACKCallConfirmBearercapabilityCauseCallcontrolcapabilityT310T313:30sDISCONNECTCALLCONFIRMEDALERTINGCONNECTT303T301:180sALERTING/CONNECTFacilitySSversion第二十页，共五十二页，2022年，8月28日21呼叫其他流程MSBSSProgressProgressindicatorPROGRESSNotificationIndicatorUsersuspendedUserresumedBearerchangeSTATUSNOTIFYMODIFYMODIFYCOMPLETEMODIFYREJECTNotifyNotificationindicatorCallStatenull connectionpendingCCpromptpresent WaitfornetworkinformationCC-Establishmentpresent CC-EstablishmentconfirmedRecallpresent callinitiatedmobileoriginatingcallproceedingcalldelivered callpresentcallreceived connectrequestmobileterminatingcallconfirmedactive disconnectrequestdisconnectindication releaserequestmobileoriginatingmodify mobileterminatingmodifyconnectindicationStatusCauseCallstateAuxiliarystatesAuxiliaryStateHoldauxiliarystateidleholdrequestcallheldretrieverequestMultipartyauxiliarystateidleMPTYrequestcallinMPTYsplitrequestModify/ModifyCompleteBearercapabilityModifyRejectBearercapabilityCauseHOLDHOLDACKNOWLEDGEHOLDREJECTRETRIEVERETRIEVEACKNOWLEDGERETRIEVEREJECTHoldReject/RetrieveRejectCause第二十一页，共五十二页，2022年，8月28日22DTMF流程MSBSSSTARTDTMFStartDTMF(ACK)KeypadfacilitySTARTDTMFACKSTOPDTMFSTOPDTMFACKStartDTMFRejectCause第二十二页，共五十二页，2022年，8月28日23呼叫释放流程MSBSSDISCONNECTRELEASERELEASECOMPLETEDISCONNECTRELEASERELEASECOMPLETET305:30sT308RELEASET308:30sRELEASERELEASET305:30sRELEASERELEASET308RELEASET308:30sRELEASEDISCONNECTRELEASECOMPLETERELEASEReleaseCausesecondecauseFacilitySSversionT306:30sT308第二十三页，共五十二页，2022年，8月28日24Um接口信令流程(早分配)OriginatedMSTerminatedMSI——CMserviceacceptI——AssignmentCommandSABM——CM_Service_ReqUI——PagingRequestType1/2/3NetworkChannelRequestUA——CM_Service_ReqUI——ImmediateAssignmentRRUI——SystemInfo5/6UI——MeasurementReportI——SETUPRRI——CallProceedingUI——SystemInfo5/6UI——MeasurementReportRRChannelRequestUI——ImmediateAssignmentSABM——PagingResponseUA——PagingResponseRACHAGCHSDCCHSDCCHSDCCHSDCCHSACCHSACCHSDCCHSDCCHSDCCHSACCHSACCHSDCCHSDCCHPCHRACHAGCHSDCCHSDCCHRRSDCCH第二十四页，共五十二页，2022年，8月28日25OriginatedMSTerminatedMSUI——SystemInfo5/6I——AlertingI——AssignmentCompleteI——SetupNetworkSABMRRUAUI——MeasurementReportUI——SystemInfo5/6UI——MeasurementReportRRRRI——AssignmentCommandUI——SystemInfo5/6UI——MeasurementReportI——CallConfirmedRRRRSABMUAI——AssignmentCompleteRRI——AlertingRRUI——SystemInfo5/6UI——MeasurementReportFACCHFACCHFACCHFACCHSACCHSACCHSACCHSACCHFACCHFACCHFACCHFACCHFACCHSACCHSACCHSDCCHSDCCHFACCHFACCHFACCHSDCCHSDCCHSACCHSACCHSDCCHSDCCHUm接口信令流程(早分配)第二十五页，共五十二页，2022年，8月28日26OriginatedMSTerminatedMSRRRRRRNetworkI——ConnectI——ConnectACKI——ConnectI——ConnectACKRRUI——SystemInfo5/6UI——MeasurementReportUI——SystemInfo5/6UI——MeasurementReportUI——SystemInfo5/6UI——MeasurementReportUI——SystemInfo5/6UI——MeasurementReportUI——SystemInfo5/6UI——MeasurementReportUI——SystemInfo5/6UI——MeasurementReportSACCHSACCHFACCHFACCHFACCHFACCHSACCHSACCHSACCHSACCHSACCHSACCHSACCHSACCHSACCHFACCHFACCHFACCHFACCHSACCHUm接口信令流程(早分配)第二十六页，共五十二页，2022年，8月28日27OriginatedMSTerminatedMSRRRRRRNetworkI——DisconnectI——ReleaseI——DisconnectI——ReleaseRRUI——SystemInfo5/6UI——MeasurementReportUAI——ReleaseCompleteRRUI——SystemInfo5/6UI——MeasurementReportUI——SystemInfo5/6UI——MeasurementReportUI——SystemInfo5/6UI——MeasurementReportI——ChannelReleaseRRDISCRRI——ReleaseCompleteRRI——ChannelReleaseDISCUASACCHSACCHFACCHFACCHFACCHFACCHSACCHSACCHSACCHSACCHFACCHFACCHFACCHFACCHFACCHFACCHFACCHFACCHFACCHSACCHFACCHFACCHFACCHFACCHFACCHSACCHFACCHFACCHUm接口信令流程(早分配)第二十七页，共五十二页，2022年，8月28日28信令流程(特别早分配)OriginatedMSTerminatedMSI——CMserviceacceptI——ChannelModeModifySABM——CM_Service_ReqUI——PagingRequestType1/2/3NetworkChannelRequestUA——CM_Service_ReqUI——ImmediateAssignmentRRUI——SystemInfo5/6UI——MeasurementReportI——SETUPRRI——CallProceedingUI——SystemInfo5/6UI——MeasurementReportRRChannelRequestUI——ImmediateAssignmentSABM——PagingResponseUA——PagingResponseRACHAGCHFACCHFACCHFACCHFACCHSACCHSACCHFACCHFACCHFACCHSACCHSACCHFACCHFACCHPCHRACHAGCHFACCHFACCHRRFACCH第二十八页，共五十二页，2022年，8月28日29OriginatedMSTerminatedMSUI——SystemInfo5/6I——AlertingI——ChannelmodeModifyACKI——SetupNetworkRRUI——MeasurementReportUI——SystemInfo5/6UI——MeasurementReportRRRRI——ChannelModeModifyUI——SystemInfo5/6UI——MeasurementReportI——CallConfirmedRRRRI——ChannelModeModifyACKRRI——AlertingRRUI——SystemInfo5/6UI——MeasurementReportFACCHFACCHSACCHSACCHSACCHSACCHFACCHFACCHFACCHFACCHSACCHSACCHFACCHFACCHFACCHFACCHFACCHFACCHSACCHSACCHFACCHFACCH信令流程(特别早分配)第二十九页，共五十二页，2022年，8月28日30OriginatedMSTerminatedMSRRRRRRNetworkI——ConnectI——ConnectACKI——ConnectI——ConnectACKRRUI——SystemInfo5/6UI——MeasurementReportUI——SystemInfo5/6UI——MeasurementReportUI——SystemInfo5/6UI——MeasurementReportUI——SystemInfo5/6UI——MeasurementReportUI——SystemInfo5/6UI——MeasurementReportUI——SystemInfo5/6UI——MeasurementReportSACCHSACCHFACCHFACCHFACCHFACCHSACCHSACCHSACCHSACCHSACCHSACCHSACCHSACCHSACCHFACCHFACCHFACCHFACCHSACCH信令流程(特别早分配)第三十页，共五十二页，2022年，8月28日31OriginatedMSTerminatedMSRRRRRRNetworkI——DisconnectI——ReleaseI——DisconnectI——ReleaseRRUI——SystemInfo5/6UI——MeasurementReportUAI——ReleaseCompleteRRUI——SystemInfo5/6UI——MeasurementReportUI——SystemInfo5/6UI——MeasurementReportUI——SystemInfo5/6UI——MeasurementReportI——ChannelReleaseRRDISCRRI——ReleaseCompleteRRI——ChannelReleaseDISCUASACCHSACCHFACCHFACCHFACCHFACCHSACCHSACCHSACCHSACCHFACCHFACCHFACCHFACCHFACCHFACCHFACCHFACCHFACCHSACCHFACCHFACCHFACCHFACCHFACCHSACCHFACCHFACCH信令流程(特别早分配)第三十一页，共五十二页，2022年，8月28日32Um接口数据链路层协议LAPDm第三十二页，共五十二页，2022年，8月28日33GSM系统专用协议群DTAPDTAPDirectTransferApplicationPartBSSMAPBSSManagementApplicationPartCMCallManagementMMMobileManagementRRRadioResourceManagementSCCPSignallingConnectionControlPartMAPMobileApplicationPartTCAPTransactionCapabilityApplicationPartISUPISDNUserPartMTPMessageTransferPartCMMMRRSig.layer2Layer1(air)Sig.layer2Sig.layer1MTPSCCPBSSMAPRR(CM+MM)MSBSCMTPMTPSCCPSCCPCMMMBSSMAPTCAPMAPISUPMSCSig.layer2Layer1(air)BTS(CM)(MM)(RR)(CM)(MM)(RR)(CM)(MM)(LAPDm)(LAPDm)(LAPD)Sig.layer2Sig.layer1(LAPD)BTSMBTSMRR'BTSMBTSManagementUmInterfaceAbisInterfaceA-interfaceInter-MSCInterface第三十三页，共五十二页，2022年，8月28日34LAPDm包括下列功能a)在Dm信道上提供一个或多个数据链路连接。数据链路连接之间是利用包含在各帧中的数据链路连接标示符来加以区别；b)允许帧类型的识别；c)顺序控制，以保持通过数据链路连接的各帧的次序；d)检测一数据链路连接上的帧格式差错和操作差错；e)把不能修复的差错通知管理实体；f)流量控制g)竞争建链LAPDm功能第三十四页，共五十二页，2022年，8月28日35LAPDm协议

（Um接口第二层,GSM04.0504.06）操作模式非证实模式(Unacknowledgedmode)第三层消息采用无编号帧又称UI帧(UnnumberedInformationframe)发送接收方对UI帧无须确认不提供流量控制机制和错误恢复机制证实模式(Acknowledgedmode)该模式采用多帧操作方式第三层消息采用编号帧又称I帧(numberedInformationframe)发送接收方需要对I帧进行确认顺序控制,保证对方第三层接收的消息次序与本方第三层提交的次序相同提供流量控制机制和错误恢复机制第三十五页，共五十二页，2022年，8月28日36LAPDm协议（Um接口第二层）LAPDm与第一层和第三层的接口第三十六页，共五十二页，2022年，8月28日37LAPDm协议（Um接口第二层）操作模式与信道的关系第三十七页，共五十二页，2022年，8月28日38LAPDm协议（Um接口第二层）帧格式地址域控制域长度域填充比特地址域控制域长度域填充比特信息域.信息域类型A类型B类型Bbis类型A:在DCCH上,当没有第三层消息要发,作为没有信息域的填充帧,长度域设为0.类型B:用于在DCCH上发送第三层消息,长度域设为信息域的长度类型Bbis:用于在BCCH/PCH/AGCH上发送第三层消息长度=3长度=N201长度=3长度=N201长度=N201第三十八页，共五十二页，2022年，8月28日39LAPDm协议（Um接口第二层）填充比特：0x2B填充帧 当无线上必须发送而没有L3消息要发时，应发填充帧。FillframeforDCCH:第三十九页，共五十二页，2022年，8月28日40LAPDm协议（Um接口第二层）地址域格式:Spare=0,LPD=00/01（01用于广播短消息）,SAPI=0/3（3用于短消息）第四十页，共五十二页，2022年，8月28日41LAPDm协议（Um接口第二层）控制域格式长度域格式：M=1表示该帧仅含第三层消息的一部分，M=0表示该帧含有一条完整的第三层消息或第三层消息的最后一部分。P/F：当该消息为命令时，该比特为P比特，表示询问（Polling)比特,置“1”要求对方予以响应；当该消息为响应时，该比特为F比特，表示最后（Final)比特，置“1”表示该响应是在对方要求下回的。第四十一页，共五十二页，2022年，8月28日42LAPDm协议（Um接口第二层）帧类型（仅适用于DCCH）I帧：N(S)为发送序号，N(R)为接收序号，V(S)为发送状态变量，表示下一次要发送的I帧的序号，V(A)为确认状态变量，表示发送序号为V(A)-1的I帧已被对方确认，V(R)为接收状态变量，表示期望对方下一个I帧的发送序号为V(R)。对N(S)、N(R)、V(S)、V(R)和V(A)的操作均为模8操作。监视帧RR帧:用于对已接收的发送序号为N（R）-1的I帧进行确认REJ帧:用于要求对方重发发送序号为N（R）的I帧RNR帧:用于通知对方本方忙，不能继续接收I帧无编号帧SABM帧:用于设置接收方为多帧证实模式DISC帧:用于设置接收方退出多帧证实模式UA帧:用于通知对方已接收到SABM或DISCUI帧DM帧:用于通知接收方发送方不能保持在多帧证实模式第四十二页，共五十二页，2022年，8月28日43LAPDm协议（Um接口第二层）建立多帧操作模式竞争下的建链方式该情况对应于移动台在RACH上发信道请求，网络在AGCH上给立即指配，由于可能有多个移动台几乎同时发信道请求，且它们使用的随机参考值相同，虽然网络只检测到一个移动台的信道请求，但其他移动台可能也会认为立即指配是发给自己的，它们也会到指定的DCCH信道进行建链，此时就发生了竞争。LAPDm协议通过采用竞争下的建链机制来解决这个问题。具体方法如下：规定必须由移动台发起建链（发SABM帧），该SABM帧带有信息域，信息域中为一条第三层消息（CM业务请求、寻呼响应、位置更新请求或IMSIDETACH）,并启动T200定时器。网络在收到该SABM后，回UA帧，该UA也带有信息域，信息域中所带第三层消息与SABM中的第三层消息完全相同。由于所带第三层消息含移动台的身份识别（IMSI、TMSI等），该身份识别具有唯一性，移动台检查收到的UA中所含第三层消息与自己在SABM中发的第三层消息完全相同才可以认为建链成功，若发现不同，应认为建链失败，并离开该信道进入空闲状态。若T200定时器超时仍未检测到UA，则重发SABM，当重发N200次后，应会到空闲状态。第四十三页，共五十二页，2022年，8月28日44LAPDm协议（Um接口第二层）建立多帧操作模式正常下的建链方式该情况对应于移动台由SDCCH收到网络的指配命令转到FACCH上建链或在SAPI=0链路建立好后建立SAPI=3的链路等。由于不存在竞争情况，因此采用正常建链方式。具体方法如下：可以由网络或移动台发起建链（发SABM帧），该SABM帧不带信息域。对方在收到该SABM后，回UA帧，该UA也不带信息域。建链（发SABM回UA）的目的是使双方进入一个已知的初始状态，即V(S)、V(A)和V(R)均为0，清除I帧发送队列和接收队列。这样就为下面的多帧传送做好了准备。第四十四页，共五十二页，202