网络优化信令分析 GSM 14-附录A MessageContent-Commit

M900/M1800基站子系统信令分析手册信令分析指导A-1AppendixAMessageIntepretationHerewillgivemessagecontentsofsomekeyinterfacemessages,theseinclude:A-interfacekeymessages,Abis-interfacekeymessages.A.1A-InterfaceKeyMessagesThereisnogeneralrulefortheorderofsignallingelements:ithappensthatthesameelementsappearinvariousordersdependingonthemessage.ThekeyBSSMAPmessagesarelistedinthefollowingtable:MessagenameReferenceASSIGNMENTREQUEST1.1.1ASSIGNMENTCOMPLETE1.1.2ASSIGNMENTFAILURE1.1.3HANDOVERREQUEST1.1.4HANDOVERREQUESTACKNOWLEDGE1.1.5HANDOVERREQUIRED1.1.6HANDOVERREQUIREDREJECT1.1.7HANDOVERCOMMAND1.1.8HANDOVERCOMPLETE1.1.9HANDOVERFAILURE1.1.10HANDOVERPERFORMED1.1.11PAGING1.1.12CLEARREQUEST1.1.13CLEARCOMMAND1.1.14CLASSMARKREQUEST1.1.15CLASSMARKUPDATE1.1.16CIPHERMODECOMMAND1.1.17CIPHERMODECOMPLETE1.1.18CIPHERMODEREJECT1.1.19COMPLETELAYER3INFORMATION1.1.20A.1.1MessageContentsI.ASSIGNMENTREQUESTThismessageissentfromtheMSCtotheBSSviatherelevantSCCPconnectioninordertorequesttheBSStoassignradioresource(s),theattributesofwhicharedefinedwithinthemessage.Themessagemayalsoincludetheterrestrialcircuittobeused.INFORMATIONELEMENTREFERENCEDIRECTIONTYPELENMessageType1.2.1MSC-BSSM1ChannelType1.2.2MSC-BSSM5-10M900/M1800基站子系统信令分析手册信令分析指导A-2Layer3HeaderInformation1.2.3MSC-BSSO(3)4Priority1.2.4MSC-BSSO3CircuitIdentityCode1.2.5MSC-BSSO(1)3DownlinkDTXFlag1.2.6MSC-BSSO(2)2InterferenceBandToBeUsed1.2.7MSC-BSSO2ClassmarkInformation21.2.8MSC-BSSO(4)4-5GroupCallReference1.2.9MSC-BSSO(5)3-8TalkerFlag1.2.10MSC-BSSO(6)1LSAAccessControlSuppression1.2.11MSC-BSSO(8)21)ThiselementisincludedwhentheMSCallocatestheAinterfacecircuitsandthechanneltypeInformationElementindicatesspeechordata,andonlyinthosecases.2)ThiselementmaybeincludedinthecaseofaspeechTCH,andonlyinthiscase.Ifnotincluded,thishasnoimpactontheDTXfunctionintheBSS.3)Thisinformationelementdoesn’tserveanyusefulpurpose.MSCsshouldnotsendtheinformationelementunlessitisrequiredbytherecipients(duetotheneedtointerworkwitholderversionsoftheprotocol).Itisexpectedthatinfutureversionsof08.08,thisinformationelementwillbedeletedfromthismessage.4)TheseelementsmaybeincludediftheinformationisknownbytheMSC.5)ThismaybeincludedbytheMSCforeitheratalkingorlisteningsubscriberinagroupcall.6)Thisinformationelementisincludedforgroupcalls,whenthisisincludeditindicatesthatthemobileisatalkerinthecallelsethemobileisalistener.7)TheinformationisindicatedbytheMSCifknown.8)ThisinformationelementisincludedifLSAaccesscontrolfunctionshallbesuppressedintheBSS.II.ASSIGNMENTCOMPLETETheASSIGNMENTCOMPLETEmessageissentfromtheBSStotheMSCandindicatesthattherequestedassignmenthasbeencompletedcorrectly.ThemessageissentviatheBSSAPSCCPconnectionassociatedwiththededicatedresource(s).INFORMATIONELEMENTREFERENCEDIRECTIONTYPELENMessageType1.2.1BSS-MSCM1RRCause1.2.12BSS-MSCO2CircuitIdentityCode1.2.5BSS-MSCO(4)3CellIdentifier1.2.13BSS-MSCO(1)3-10ChosenChannel1.2.14BSS-MSCO(3)2ChosenEncryptionAlgorithm1.2.15BSS-MSCO(5)2CircuitPool1.2.16BSS-MSCO(2)2SpeechVersion(Chosen)1.2.17BSS-MSCO(6)2LSAIdentifier1.2.18BSS-MSCO(7)51)Thecellidentifierisusedtoindicateanewcell,ifduringtheassignmenttheservingcellhaschanged.M900/M1800基站子系统信令分析手册信令分析指导A-32)ShallbeincludedwhenseveralcircuitpoolsarepresentontheBSSMSCinterfaceandacircuitwasallocatedbytheASSIGNMENTREQUESTmessage.3)Includedatleastwhenthechannelrate/typechoicewasdonebytheBSS.4)TheCircuitIdentityCodeinformationelementisincludedmandatorilybytheBSSiftheBSSallocatestheAinterfacecircuitsandacircuitisneeded.5)IncludedatleastwhentheencryptionalgorithmhasbeenchangedbytheBSS.6)IncludedatleastwhenthespeechversionchoicewasdonebytheBSS.7)ShallbeincludedifcurrentLSAintheservingcellhasbeenidentified(seeGSM03.73).NotincludedmeansthatthereisnocurrentLSAintheservingcell.III.ASSIGNMENTFAILURETheASSIGNMENTFAILUREmessageissentfromtheBSStotheMSCviatherelevantSCCPconnection.ItindicatesthattherehasbeenafailureintheassignmentprocessattheBSSandthattheassignmentprocedurehasbeenaborted.INFORMATIONELEMENTREFERENCEDIRECTIONTYPELENMessageType1.2.1BSS-MSCM1Cause1.2.19BSS-MSCM3-4RRCause1.2.12BSS-MSCO2CircuitPool1.2.16BSS-MSCO(1)2CircuitPoolList1.2.20BSS-MSCO(2)V1)ShallbeincludedwhenseveralcircuitpoolsarepresentontheBSSMSCinterface.2)Maybeincludedwhencauseiscircuitpoolmismatchorswitchcircuitpooltoindicatecircuitpoolpreferences.TypicalCausevaluesare:-radiointerfacemessagefailure,-OandMintervention,-equipmentfailure,-noradioresourceavailable,-requestedterrestrialresourceunavailable,-requestedtranscoding/rateadaptionunavailable,-terrestrialresourcealreadyallocated,-invalidmessagecontents,-radiointerfacefailure-reversiontooldchannel,-directedretry,-circuitpoolmismatch,M900/M1800基站子系统信令分析手册信令分析指导A-4-switchcircuitpool.-requestedspeechversionunavailable.IV.HANDOVERREQUESTThismessageissentfromtheMSCtotheBSSviatherelevantSCCPconnectiontoindicatethattheMSistobehandedovertothatBSS.INFORMATIONELEMENTREFERENCEDIRECTIONTYPELENMessageType1.2.1MSC-BSSM1ChannelType1.2.2MSC-BSSM5-10EncryptionInformation1.2.21MSC-BSSM(1)3-nClassmarkInformation1Or1.2.22MSC-BSSM#2ClassmarkInformati