【正文】 幾個物理實體的通信，主要功能是支持移動用戶的位置登記、位置刪除、用戶業(yè)務管理、參數(shù)管理、漫游、越區(qū)切換、鑒權(quán)、保密數(shù)據(jù)傳輸?shù)取acility Not Supported。System Failure Teleservice not provisioned。Data Missing。 在 GSM信令網(wǎng) SP、 STP間傳送 MAP信令消息必須有 SCCP的支持 ， SCCP的地址是由 GT、 DPC、 SSN組成。 FR Data 12/6/Classmark Information 2Phase1/Phase2 MSControlled Early Classmark Sending RF Power CapabilityPseudo Synchronization CapabilitySupplementary Service Screening IndicationMT SMS pt. To pt. CapabilityFrequency Capability(GSM900 Extended?)A5/1。FRV2。 CIC表示該消息屬于哪條話音電路（它的長度是 12比特，因此一條數(shù)字信令鏈路理論上可載送 212 =4096條話路的信令消息）。System Failure。Unexpected data value Unknown subscriber67江蘇上海北京MSRN路由接續(xù)的機理TMSCMSC/VLRTMSCGMSCIAMHLRMSC/VLRTMSCMSC/VLR0210216495SRIPRN“13901234567” 021649577006495xxxx6485xxxx02164957700MSRNMSISDN MSRN6495770064957701 6495ABCD“13901234567”0123HLR號68切換流程? 小區(qū)內(nèi)切換流程? 小區(qū)間切換流程? 外部切換流程? MSC間切換69小區(qū)內(nèi)切換MSC BTSBSC MSSABM(FACCH)Measurement resultChannel activation ackEstablish indicationRelease ConfirmationMeasurement reportAssigment plete(FACCH)HO PerformedRF Channel Release ACKAssigment mand (FACCH)Release RequestRF Channel ReleaseChannel activationUA（ FACCH）Receiver Ready(FACCH)70外部切換MSMSC BSS2 BSS1Measurement Report(SACCH)BTS2 BTS1Measurement ResultHandover RequiredHandover RequestChannel ActivationChannel Activation ACKHO Request ACKHandover Command Handover Command(FACCH)Handover Access(FACCH) Handover DetectionHandover Detection Physical Information (FACCH)SABM (FACCH) Establish IndicationUA (FACCH)Handover Complete (FACCH)Receiver Ready (FACCH) Handover CompleteHandover CompleteClear CommandRelease RequestRelease ConfirmationRF Channel ReleaseRF CH Release ACKClear Command71MS/BSSA MSCA MSCB BSSB/MS VLRBHO RequiredMSC間切換流程（一）Prepare Handover Target cell ID BSS APDU Prep HO Alloc HO numberHO RequestHO Request ackPrep HO ack Send HO reportIAM Send HO report ackACMHO Command HO DetectProc access sigHO CompleteSend end sig reqClear CommandANSReleaseSend end sig ackSend Handover ReportHandover numberLinked IDPrepare Handover ackBSS APDU Handover numberUser errorProvider error User errorNo handover number availableSystem failureUnexpected data valueData missingProcess access signalSend end signalClear CompleteClear CommandClear Complete需要電路連接的 MSC間基本切換72MSC間切換流程（二）不需要電路連接的 MSC間基本切換MS/BSSA MSCA MSCB BSSB/MS VLRBHO Required Prep HOHO RequestHO Request ackPrep HO ackHO Command HO DetectProc access sigHO CompleteSend end sig reqClear CommandSend end sig ackClear CompleteClear CommandClear Complete73MS/BSSA MSCA MSCB BSSB/MS VLRBHO RequiredMSC間切換流程（三）Prepare subsequent Handover Target cell IDTarget MSC number BSS APDU Prep sub HOHO RequestHO Request ack Prep sub HO ackHO CommandHO DetectHO CompleteClear CommandReleaseSend end sig ackUser errorUnkown MSCSubsequent handover failureUnexpected data valueData missingPrepare subsequent Handover ack User errorProvider error Clear CompleteMSC B切換回 MSC A，使用電路連接74MS/BSSA MSCA MSCB BSSB/MS VLRBHO RequiredMSC間切換流程（四）Prep sub HOHO RequestHO Request ack Prep sub HO ackHO CommandHO DetectHO CompleteClear CommandSend end sig ackClear CompleteMSC B切換回 MSC A，不使用電路連接75MSCA MSCB BSSB/MS MSCC VLRCHO RequiredMSC間切換流程（五）Prep sub HOHO RequestPrep HO ack Send HO reportIAMACMHO Command HO DetectProc access sigHO CompleteSend end sig reqClear CommandANSReleaseSend end sig ackClear CompleteBSSC/MSPrep HOAlloc HO numberHO Request ackSend HO report ackPrep sub HO ackReleaseSend end sig ackClear CmdClear CmplMSC B切換到 MSC C，使用電路連接76MSCA MSCB BSSB/MS MSCC VLRCHO RequiredMSC間切換流程（六）Prep sub HOHO RequestPrep HO ackHO Command HO DetectProc access sigHO CompleteSend end sig reqClear CommandSend end sig ackClear CompleteBSSC/MSPrep HOHO Request ackPrep sub HO ackSend end sig ackClear CmdClear CmplMSC B切換到 MSC C，不使用電路連接77MSC間切換流程（七）不需要電路連接的 MSC間基本切換后，建立電路連接MS/BSSA MSCA MSCB BSSB/MS VLRBPrep HOAssignment RequestAssignment CmplPrep HO ackSend end sig ack Clear CommandClear CompleteAlloc HO numberSend HO reportSend HO report ackIAMACMANSRelease78SDCCH上的短信主叫流程MS BTSChannel RequestRACHAGCHSDCCHSDCCHBSC MSCChannel RequestChannel ActiveChannel Active ACKImm. AssignmentSABM(CMSERVREQ) EST IND(CMSERVREQ) CR(CMSERVREQ)UA(CMSERVREQ) CC(AUTHREQ)AUTHREQAUTHRESCIPH MODE CMDENCR CMDCIPH MODE CMDCIPH MODE CMP CIPH MODE CMPSABM(SAPI=3) EST IND(SAPI=3)UA(SAPI=3) CPDATACPACKCPDATACPACK Clear CommandChannel ReleaseDEACT SACCHDISC(SAPI=0)Release IndicationUA(SAPI=0)Local releaseSAPI=3 Clear CompleteRF Channel ReleaseTo SCFrom SC79SDCCH上的短信被叫流程MS BTSPage RequestPCHAGCHSDCCHSDCCHBSC MSCPaging CommandChannel RequestChannel Active ACKImm. AssignmentSABM(Page Response) EST IND(Page Resp.) CR(Page Resp.)UA(Page Resp.) CC(AUTHREQ)AUTHREQAUTHRESCIPH MODE CMDENCR CMDCIPH MODE CMDCIPH MODE CMP CIPH MODE CMPSABM(SAPI=3) EST REQ(SAPI=3)UA(SAPI=3)CPDATACPACKCPDATACPACK Clear CommandChannel ReleaseDEACT SACCHDISC(SAPI=0)Release IndicationUA(SAPI=0)Local releaseSAPI=3 Clear CompleteRF Channel ReleasePagingChannel RequestChannel ActiveEST CONF(SAPI=3)CPDATARACHFrom SCTo SC80TCH上的短信主叫流程MS BTSFACCHFACCHSACCHBSC MSCTo SCACTIVE CALLACTIVE CALLCM SERV REQCM SERV ACCSABM(SAPI=3) EST IND(SAPI=3)UA(SAPI=3) CPDATACPACKCPDATACPACKFrom SC81TCH上的短信被叫流程MS BTSSACCHBSC MSCFrom SCACTIVE CALLACTIVE CALLSABM(SAPI=3)EST CONF(SAPI=3)UA(SAPI=3)CPDATACPACKCPDATACP