A接口培訓(xùn)資料

A接口結(jié)構(gòu)與協(xié)議1主要內(nèi)容A接口位置A接口的分層協(xié)議結(jié)構(gòu)A接口消息結(jié)構(gòu)A接口信令流程處理A接口信令的硬件MPA7300多鏈路協(xié)議分析儀參考規(guī)范協(xié)議：ITU-T：Q.700—Q.719 Q.750—Q.759GSM：08.01,08.02,08.04, 08.06,08.08MSC))))))BTSBSCEIRVLRHLRAUCMSCPSTNMAP/TCAP+ISUP/TUP--ETootherVLRISUP/TUPDTAP+BSSMAPMAP/TCAP--CMAP/TCAP--DMAP/TCAP--GA-interfaceA接口在GSM中位置BFA_bisUmA接口協(xié)議組成基于NO.7信令系統(tǒng)的

MTPandSCCP應(yīng)用

BaseStationSubsystemApplicationPart(BSSAP)基站子系統(tǒng)管理應(yīng)用部分--BSSManagementApplicationPart(BSSMAP)RadioResource(RR)andBSCmanagementUsesSCCPconnectionlessservice（面向連接服務(wù)）直接傳送應(yīng)用部分--DirectTransferApplicationPart(DTAP)TransferofCallControl(CM)messagesTransferofMobilityManagement(MM)messagesUsesSCCPconnection-orientedservice（無(wú)連接服務(wù)）A接口協(xié)議分層結(jié)構(gòu)DTAPSig.layer2Sig.layer1MTPSCCPBSSMAPRR(CM+MM)BSC(CM)(MM)(LAPD)BTSMMTPMTPSCCPSCCPCMMMBSSMAPTCAPMAPISUPMSCLayer1-PhysicalLayer2-DataLinkLayer3-NetworkA-interface七號(hào)信令與OSI分層結(jié)構(gòu)應(yīng)用層 Application表示層 Presentation

會(huì)話層 Session

運(yùn)輸層 Transport網(wǎng)絡(luò)層 Network

數(shù)據(jù)鏈路層Datalink

物理層 Physical信令網(wǎng)絡(luò)SignallingNetwork信令鏈路Signallinglink數(shù)據(jù)鏈路Datalink用戶和應(yīng)用部分MTPFBIBBSNFSNFIBLISIOLabelSIFCKFLevel2Level3Level4Level2FBIBBSNFSNFIBLISFCKFLevel2FBIBBSNFSNFIBLICKFLevel2FISULSSUMSUFISU Fill-insignalunitLSSU LinkstatussignalunitMSU MessagesignalunitF FlagBSN BackwardsequencenumberBIB BackwardindicatorbitFSN ForwardsequencenumberFIB ForwardindicatorbitLI LengthindicatorCK ChecksumSF StatusfieldSIO ServiceinformationoctetSIF SignallinginformationfieldLevel2Level3信號(hào)單元格式信號(hào)單元格式MSU:（消息信號(hào)單元）是真正攜帶消息的信號(hào)單元， 消息包含在SIF和SIO字段中。LSSU：（鏈路狀態(tài)信號(hào)單元）傳送網(wǎng)絡(luò)鏈路狀態(tài)， 鏈路狀態(tài)由SF字段指示。FISU：（填充信號(hào)單元）在網(wǎng)絡(luò)節(jié)點(diǎn)無(wú)信息傳送時(shí) 向?qū)Ψ桨l(fā)送空信號(hào)，使信令鏈路保持通信狀態(tài)。消息傳遞部分（MTP）MTP分為三級(jí)，功能是提供一個(gè)可靠的傳遞系統(tǒng)，保證兩個(gè)不同地點(diǎn)對(duì)應(yīng)UP之間傳送的信令消息沒有差錯(cuò)、丟失和重復(fù)。1.第一級(jí)：信令數(shù)據(jù)鏈路功能定義了信令數(shù)據(jù)鏈路的物理、電氣和功能特性以及鏈路接入方法。信令數(shù)據(jù)鏈路應(yīng)該是透明的，即傳送的數(shù)據(jù)不能有任何改變。2.第二級(jí)：信令鏈路功能定義了信令消息沿?cái)?shù)據(jù)鏈路傳送的功能和過(guò)程，包括：——信號(hào)單元的定界和定位——信號(hào)單元的差錯(cuò)檢測(cè)、校正——信令鏈路的故障檢測(cè)和恢復(fù)——信令鏈路流量控制3.第三級(jí)：信令網(wǎng)絡(luò)功能定義了信令網(wǎng)操作和管理的功能和信令過(guò)程，由兩部分組成：——信令消息處理功能包括：

消息鑒別

消息分配

消息路由該功能的作用是實(shí)際傳遞一條信令消息時(shí)，引導(dǎo)該消息到達(dá)適當(dāng)?shù)男帕铈溌坊蛴脩舨糠?。消息傳遞部分（MTP）——信令網(wǎng)絡(luò)管理功能：

信令業(yè)務(wù)管理：將信令業(yè)務(wù)從一條信令鏈路或路由轉(zhuǎn)到一條或多條不同的鏈路或路由，或在信令點(diǎn)擁塞的情況下暫時(shí)減少信令業(yè)務(wù)。

信令鏈路管理：用于控制本端連接的信令鏈路，包括信令鏈路的接通、恢復(fù)和斷開等功能。目的是為建立和保持鏈路組的正常工作提供手段。

信令路由管理：用于在信令點(diǎn)之間可靠地交換關(guān)于信令路由是否可用的信息，并及時(shí)地閉塞信令路由或解除信令路由的閉塞。消息傳遞部分（MTP）信令連接控制部分（SCCP）一、概述MTP只能實(shí)現(xiàn)無(wú)連接傳輸，SCCP的目的是和MTP相結(jié)合，提供相當(dāng)于OSI結(jié)構(gòu)的網(wǎng)絡(luò)層功能，實(shí)現(xiàn)信令消息在任意兩個(gè)信令點(diǎn)之間透明的直接傳輸，將SCCP和MTP合稱為網(wǎng)絡(luò)業(yè)務(wù)部分（NSP）。MTP(BSSAP)SSDTAPLayer2Layer3BSSMAPSCCP信令連接控制部分（SCCP）邏輯信令鏈路的建立與釋放；傳送與電路無(wú)關(guān)的信令消息；具有增強(qiáng)的尋址選路功能，在不同的七號(hào)信令網(wǎng)之間實(shí)現(xiàn)信令的直接傳輸；既能提供無(wú)連接服務(wù)，也能提供面向連接服務(wù)。SCCP的應(yīng)用特點(diǎn)：SCCP提供四類協(xié)議：CLASS0：基本的無(wú)連接服務(wù)；CLASS1：消息有序的無(wú)連接服務(wù)；CLASS2：基本的面向連接服務(wù)；CLASS3：帶有流量控制的面向連接服務(wù)。無(wú)連接數(shù)據(jù)傳送無(wú)連接服務(wù)：不需預(yù)先建立連接，消息由始發(fā)節(jié)點(diǎn)SCCP經(jīng)由MTP直接送達(dá)終節(jié)點(diǎn)SCCP，其傳送的消息稱單元數(shù)據(jù)（UDT）。SCCP1SCCP2UDTSCCP1SCCP2SCCP3MTP1MTP3MTP2UDT邏輯傳輸路徑實(shí)際傳輸路徑UDT無(wú)連接數(shù)據(jù)傳送UDT：UNITDATA面向連接數(shù)據(jù)傳送面向連接服務(wù)：需要在發(fā)送消息之前，先通過(guò)應(yīng)答的方式在始節(jié)點(diǎn)和終節(jié)點(diǎn)間建立一條消息傳輸路徑，即信令邏輯連接或虛連接，這種方式適合傳送大量的成批數(shù)據(jù)。因?yàn)閿?shù)據(jù)發(fā)送前確認(rèn)終節(jié)點(diǎn)能收到數(shù)據(jù)，同時(shí)預(yù)先建立連接使后續(xù)數(shù)據(jù)的傳輸不需要再進(jìn)行路由選擇，縮短傳輸時(shí)延。面向連接服務(wù)有兩類協(xié)議，即2類和3類協(xié)議，它們都可以保證消息傳送收發(fā)順序一致，可以對(duì)長(zhǎng)消息分段傳送，在接收端重新組裝，此外，3類協(xié)議還具有流量控制、加速數(shù)據(jù)傳送和消息丟失及錯(cuò)序檢測(cè)等增強(qiáng)功能。SCCP尋址選路功能： DPC+SSN和GTCRCRCCCCRLSDRLSDRLCRLCDatatransferDatatransferSTPSPASPBC面向連接數(shù)據(jù)傳送SCCP消息1消息類型ITU-T建議共定義16種SCCP消息，根據(jù)應(yīng)用范圍歸為四類：（1）無(wú)連接服務(wù)消息（UDT、UDTS）（2）連接建立和釋放消息（CR、CC、CREF、RLSD、RLC）（3）面向連接數(shù)據(jù)傳送消息（DT1、DT2、AK、ED、EA、 RSR、RSC）（4）異常處理消息（ERR、IT）CR ConnectionrequestCC ConnectionconfirmCREF ConnectionrefusedRLSDReleasedRLC ReleasecompleteDT1 Dataform1UDT UnitdataUDTS UnitdataserviceERR ProtocoldatauniterrorIT InactivitytestSCCP消息SCCP消息格式FBIBBSNFSNFIBLISIOLabelSIFCKFDestinationpointcodeOriginatingpointcodeSLSSCCP用戶數(shù)據(jù)消息類型長(zhǎng)度固定的必備部分長(zhǎng)度可變的必備部分任選部分SCCP消息結(jié)構(gòu)SCCP消息是封裝在MTP的MSU中向外發(fā)送的，對(duì)于MSU而言，SCCP就是其SIF字段。由以下幾部分組成：1、路由選擇標(biāo)記：結(jié)構(gòu)為OPC+DPC+SLS；2、消息類型：識(shí)別不同的SCCP消息；3、長(zhǎng)度固定的必備部分4、長(zhǎng)度可變的必備部分5、任選部分BSSMAP（BSSManagementApplicationPart）基站子系統(tǒng)管理應(yīng)用部分—BSSMAP支持在MSC和BSS之間所有要求解釋和與呼叫、資源管理有關(guān)的信息過(guò)程，有些BSSMAP還與無(wú)線資源管理消息有關(guān)。BSSMAP消息：Assignmentmessages(setupoftrafficchannels)分配消息AssignmentrequestAssignmentcompleteAssignmentfailureHandovermessages切換消息Handoverrequest (toBSC:requestforhandovertothatBSC)Handoverrequired (toMSC:interBSC/MSChandoverrequired)Handoverrequestack. (toMSC:acknowledgeofhandoverrequest)Handovercommand (toBSC:containsnewradiochannel/BTSfortheMS)Handovercomplete (toMSC:commandedhandoversuccessful)Handoverfailure (toMSC:commandedhandoverunsuccessful)Handoverperformed (toMSC:BSChasperformedinternalhandover)Handovercandidateenquiry (toBSC:MSCrequestslistofMSthatcouldbehanded overtoanothercell)Handovercandidateresponse (toMSC:answertohandovercandidateenquiry)Handoverrequiredreject (toBSC:requiredhandoverunsuccessful)Handoverdetect (toMSC:commandedhandoversuccessful)Releasemessages釋放消息Clearcommand (releaseoftrafficchannel)ClearcompleteClearrequestSAPI“n”clearcommand (controloflayer2SAPI“n”ontheradiointerface)SAPI“n”clearcompleteSAPI“n”rejectGeneralmessages一般消息Reset (initialisationofBSSorMSCduetofailure)ResetacknowledgeOverload (processororCCCHoverload)Traceinvocation (startproductionoftracerecordResetcircuit (initialisationofsinglecircuitduetofailure)ResetcircuitacknowledgeTerrestrialresourcemessages陸地資源消息Block (managementofcircuits/timeslotsbetweenMSCandBTS)BlockingacknowledgeUnblockUnblockingacknowledgeBSSMAP消息（2）Radioresourcemessages無(wú)線資源管理消息Resourcerequest (availableradiochannelsinBSScells)ResourceindicationPaging (pagingofMS)Ciphermodecommand (startencryption)Classmarkupdate (changeofMSpowerclass)CiphermodecompleteQueuingindication (indicatesdelayinassignmentoftrafficchannel)Completelayer3information (containsfirstmessagereceivedfromMS; setsupSCCPconnection)BSSMAP消息（3）FBIBBSNFSNFIBLISIOLabelSIFCKFSCCPaddressFE=BSSAPDisc.0=BSSMAPLengthindicatorBSSMAPmessagetypeBSSMAPmessageFixedLengthInfo.ElementFormatInformationElementIdentifierLengthofInformationElementsContentofInformationElementsVariableLengthInfo.ElementFormatInformationElementIdentifierContentofInformationElementsBSSMAP消息格式DTAP（DirectTransferApplicationPart）直接傳送應(yīng)用部分—DTAP消息用于在MSC和MS之間傳遞呼叫控制和移動(dòng)管理消息，BSS不對(duì)其進(jìn)行解釋。DTAP消息：1.MobilityManagement(MM)移動(dòng)管理Registrationmessages寄存消息IMSIdetachindication (inactiveindicationofIMSI/TMSI)Locationupdatingaccept (controlofroaming)LocationupdatingrejectLocationupdatingrequestSecuritymessages(controlofauthenticationandTMSIallocation)安全消息AuthenticationrejectAuthenticationrequestAuthenticationresponseIdentityrequestIdentityresponseTMSIreallocationcommandTMSIreallocationcompleteDTAP消息(2)Connection-managementmessages(controlofCMaccess)連接管理消息CMserviceacceptCMservicerejectCMservicerequestCMreestablishmentrequestMiscellaneousmessagesMMstatus (reportssignalling-errorconditions)2.CallControl(CC)呼叫控制Callestablishmentmessages呼叫建立消息AlertingCallconfirmedCallproceedingConnectConnectacknowledgeEmergencysetupProgressSetupDTAP消息(3)Callinformationphasemessages呼叫信息階段消息Modify (usedtomodifyacallfromspeechtodata)ModifycompleteModifyrejectUserinformation (transferinformationbetweenGSM/ISDNusers)Callclearingmessages呼叫清除消息DisconnectReleaseReleasecompleteMiscellaneousmessagesCongestioncontrol (flowcontrolforuser-informationmessages)Notify (informsremoteuserofsuspend/resume)Status (reportssignalling-errorconditions)StatusenquiryStartDTMFStopDTMFStopDTMFacknowledgeStartDTMFacknowledgeStartDTMFrejectShortmessageservice（SMS）短消息業(yè)務(wù)DTAP消息(4)MessagesCP-data (transferofSMSmessage)CP-ack (acknowledgementofreceivedSMSmessage)CP-error (errorindication)InformationelementsCP-userdata (containstheSMSmessage)CP-cause (indicatesreasonforCPerrormessageSupplementaryServices(SS)補(bǔ)充業(yè)務(wù)DTAP消息(4)MessagesHold (usedtoputanactivecallonholdwhensync.of resourcesbetweenMSandnetworkisrequired)HoldacknowledgeHoldrejectRetrieve (retrieveacallfromhold)RetrieveacknowledgeRetrieverejectFacility (requestofsupplementaryservicesduringacall)Register (requestofsupplementaryservicesoutsideacall)InformationelementsFacility (usedforrequestofsupplementaryservices)DTAP消息格式FBIBBSNFSNFIBLISIOLabelSIFCKFSCCPaddressFE=BSSAPDisc.1=DTAPLengthindicatorBSSMAPmessagetypeBSSMAPmessageFixedLengthInfo.ElementFormatInformationElementIdentifierLengthofInformationElementsContentofInformationElementsVariableLengthInfo.ElementFormatInformationElementIdentifierContentofInformationElementsDLCIMSCBSC

SCCPCR(BSSMAPComplayer3info(CMServiceRequest[MM]))

SCCPCC(BSSMAPCiphermodecommand)

SCCPDT1(BSSMAPCiphermodecomplete)

SCCPDT1(DTAP(Setup[CM]))

SCCPDT1(DTAP(CallProceeding[CM]))

SCCPDT1(BSSMAPAssignmentrequest)

SCCPDT1(BSSMAPAssignmentcomplete)

SCCPDT1(DTAP(Alerting[CM]))

SCCPDT1(DTAP(Connect[CM]))

SCCPRLC

SCCPDT1(DTAP(Disconnect[CM]))

SCCPDT1(DTAP(Release[CM]))

SCCPDT1(DTAP(ReleaseComplete[CM]))

SCCPDT1(BSSMAPClearcommand)

SCCPDT1(BSSMAPClearcomplete)

SCCPRLSD.........ActivecallSCCP信令LocationUpdateMSBTSBSCMSCVLRVLR'HLRLocationUpdateRequest(oldLAI,TMSI)[MM]UpdateLocationArea(oldLAI,newLAI,TMSI)SendIdentificationSendIdentificationAck(IMSI)UpdateLocation(IMSI,MSRN,VLRno)CancelLoc(IMSI,VLR'no)CancelLocationAckInsertSubscriberData(IMSI,serviceinf)InsertSubscriberDataAcknowledgeUpdateLocationAreaAckForwardNewTMSI(TMSI)LocationUpdateAccept(newLAI,TMSI)[MM]TMSIReallocationComplete[MM]TMSIAckChannelRelease[RR]ClearCommand[RR]CCChannelReleaseCompleteClearCompleteRLSDRLCCRAuthenticationRequestAuthenticationResponseCipherModeCommandCipherModeCommandCipherModeCompleteCipherModeCompleteAuthenticate(RAND)AuthenticationResponse(SRES)UpdateLocationAckSetCipherMode(A)OutgoingCallBTSBSCMSCVLRISDNImmediateAssign[RR]CMServiceReq(IMSI,transact)[MM](CR)ProcessAccessRequestAuthenticate(RAND)AuthenticationRequest(RAND)[MM]AuthenticationResponse(SRES)[MM]AuthenticationResponse(SRES)Setcipheringmode(key)CipheringModeCommand(key)[RR]CipheringModeComplete[RR]AccessRequestAckSETUP(service,callednumber)[CM]Sendinfoforo/g(service,callednumber)CompletecallCallProceeding

AssignRequest[RR]AssignCommand[RR]AssignCompleteIAMACMANMAlerting[CM]Connect[CM]ConnectAckCCMSChannelRequest/Required[RR](A)Signalling-incomingcallIAM(MSISDN,service)BTSBSCMSCVLRHLRGMSCISDNSendRoutingInfo(MSISDN)RoamingNumber(MSRN)RoutingInfo(MSRN)ProvideRoamingNumber(IMSI)IAM(MSRN,service)SendInfoIncomingCall(MSRN,service)Page(IMSI,TMSI,LAI)PagingRequest(TMSI)[RR]PagingResponse(TMSI)[RR]PageResultCompleteCall(service)ChannelRequest[RR]ImmediateAssign[RR]SETUP(service)[CM]CallConfirm[CM]AssignCommand[RR]AssignReq[RR]AssignComplete[RR]Alerting[CM]ACMConnect[CM]ANMConnectAck[CM]CompleteCa