Gsm信令消息详解-Update

GSM信令消息详解目的和内容目的介绍GSM信令流程中一些常用信令消息包含的主要内容内容GSM网络协议介绍无线链路建立流程（ChannelRequest/ChannelRequired）TCH正常分配流程（AssignmentRequest）主叫流程（ClassmarkUpdate/Setup）切换流程（HandoverCommand/HandoverRequired/HandoverRequest）GSM网络协议定义手机与网络间建立一个无线链路，用于信令传送包括以下四个步骤Paging过程（PagingProcedure）（仅用于被叫流程中）随机接入过程（RandomAccessProcedure）立即分配过程（ImmediateAssignmentProcedure）SCCP联接建立过程（SCCPConnectionEstablishmentProcedure）无线链路建立流程（一）MSBTSBSCMSCChannelRequestChannelRequiredChannelActivation（SD）ChannelActAck（SD）ImmediateAssignmentCommandUIImmAssignment/ImmAssExtSABM[L3Info]EstInd[L3Info]SCCPConRqrd[L3]SCCPConnConfirmUA[L3Info]无线链路建立流程（二）无线链路建立流程（三）ChannelrequestEstablishcause(可变长度3到6比特）主叫，被叫，短消息，位置更新等Randomreference（可变长度2到5比特)用于冲突鉴别ChannelrequiredChannelnumberRequestreference（即channelrequest中的cause＋randomreference）Accessdelay（即基站测得的时间提前量）无线链路建立流程（四）无线链路建立流程（五）MSBTSBSCMSCChannelActivationTCHSABM(FACCH)ChannelActivationAck.AssignmentCommandAssignmentCommandAssignmentRequestPhysicalContextRequestPhysicalContextConfirmEstablishIndicationUAAssignmentCompleteAssignmentCompleteAssignmentCmpRFChannelRelease(SD)RFChannelReleaseAck.TCH分配过程（一）Assignmentrequest主要内容信道类型TCH分配过程（二）语音版本Speechversion1:目前使最常用Speechversion2:EFRSpeechversion3:AMRTCH分配过程（三）TCH分配过程（四）优先级PCI＝pre-emptioncapabilityindicatior（是否可以剔除优先级较低的电话）0：不可以剔除1：可以剔除Priority1：优先级最高15：优先级最低Queuingallowedindicator（是否允许该呼叫排入队列中）0：不可排入队列1：可以排入队列PVI＝pre-emptionVulnerabilityIndicator（该呼叫本身是否可以被其他高优先级的呼叫剔除）0：不可以被剔除1：可以被剔除TCH分配过程（五）CIRCUITIDENTITYCODE该电话分配在哪条PCM的哪个时隙TCH分配过程（六）主叫过程（一）MSBTSBSCMSCCallProceedingESTIN(CM_Serv_Req)RRConnectionEstablishmentRRConnectionEstablishmentRRConnectionEstablishmentAuthenticationProcedureCipheringProcedureTMSIReallocProcedureAuthenticationProcedureCipheringProcedureTMSIReallocProcedureAuthenticationProcedureCipheringProcedureTMSIReallocProcedureSETUPSETUPSETUPCallProceedingCallProceedingAssignmentProcedureAssignmentProcedureAssignmentProcedureAlertingAlertingAlertingConnectConnectConnectConnectAck.ConnectAck.ConnectAck.SpeechCM_Serv_ReqSDCCHTCHClassmarkchangeClassmarkupdateClassmarkchangeCM_Serv_AcceptCM_Serv_AcceptCM_Serv_Accept主叫过程（二）ClassmarkupdateClassmarkinformationtype2主叫过程（三）Revisionlevel:00：phase1手机.01：phase2手机10：支持R99or更新版本的手机SMCapability:是否支持接收短消息FCFrequencyCapability:(统计网络中EGSM手机的比例）是否支持G1频段（EGSM频段）长春全网的EGSM手机占到71.65％，市区EGSSM手机占到75.1％，郊区占到62.7%CM3Classmark3:是否有附加的classmarkinformationtype3的内容主叫过程（四）SetupBearercapabilityRadiochannelrequirement–00reserved–01fullratesupportonlyMS–10dualratesupportMS/halfratepreferred–11dualratesupportMS/fullratepreferredSpeechversionindication–0000GSMfullratespeechversion1–0010GSMfullratespeechversion2–0100GSMfullratespeechversion3–0001GSMhalfratespeechversion1–0011GSMhalfratespeechversion2–0101GSMhalfratespeechversion3主叫过程（五）主叫过程（六）CalledpartyBCDnumber–Calledpartynumber（主叫手机拨打的被叫号码）CallingpartyBCDnumber–Callingpartynumber（被叫手机显示的主叫号码）主叫过程（七）MSBTSservingBSCMSCBTStargetHOAlarm&CandidateCellChannelActivationChannelActAck.HOCommandHOCommandHOAccessHODetectionSABMEstablishIndUAHandoverCompleteHandoverCompleteHandoverPerformedRFChannelReleaseRFChannelRel.Ack.ST9103ET9103ST3103ST3103ST3105ET3105PhysicalInfoST3124ET3124ST200ET200ST_RCR_ACKET_RCR_ACKPhysContextReqPhysContextConfST9108ET9108MeasReportMeasResultInternalInterCell切换过程——异步切换Handovercommand小区描述（celldescription）BCCH和BSIC用来识别切换目标小区。BCCH从0到1024BCCHhighpart：1代表256，2代表512InternalInterCell切换过程——异步情况（一）InternalInterCell切换过程——异步情况（二）信道描述（channeldescription）InternalInterCell切换过程——异步情况（三）Handoverreference与handoveraccess中的切换参考号相对应，识别切换手机MSBTSservingBSCservingMSCBTStargetMeasReportMeasResultHOAlarm&CandidateCellChannelActivationChannelActAck.HOCommandHOCommandHOAccessHODetectionSABMEstablishIndUAHandoverCompleteHandoverCompleteHOCompleteRFChannelReleaseRFCh.Rel.Ack.BSCtargetHORequired要求切出HORequest要求切入HORequestAck.HOCommandPhysInformation（SCCPConRequired）（SCCPConConf）.ClearCompleteSCCPReleasedSCCPRel.Cmp.STrr2ET3124ETrr2ST_HO_REQ_LostST9103ST9103ST9113ST3103ET3103ST3124ST200ET200ST3106ET3106ST8ET8ExternalInterCell切换过程——异步切换（一）ET9113ET_HO_REQ_LostExternalInterCell切换过程——异步切换（二）Handoverrequired（切出请求）CauseCellidentifierlist（候选小区列表）使用LAC＋CI标识候选小区可以有多个候选小区，由OMC参数决定ExternalInterCell切换过程——异步切换（三）ExternalInterCell切换过程——异步切换（四）ExternalInterCell切换过程——异步切换（五）Handoverrequest（切入请求）ChanneltypeExternalInterCell切换过程——异步切换（六）Cellidentifierserving和cellidentifiertarget采用LAC＋CI来标识PriorityPVIQueuingallowedindicatorPCICircuitidentifiercodeHandovercause谢谢