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1、GSM协议栈设计结构1ArchitectureofGSM2CC2.1SummaryInGSMprotocol,bothSSprotocolandCCprotocolaresub-protocolofCMprotocol.TheCCentityusesboxtocommunicatewithAPI,MMandRR.EachCCentityshallcommunicatewiththecorrespondentpeerentityusingitsownMMconnection.1.1ObjectModelDiagramInCCmodule
2、,differentCCcontextneedsinterworkwithothers,soallCCcontextareorganizedinaqueue.EveryCCcontextwillmanageacall.1.2ObjectsDescriptionThefunctionsofCCentityasfollowing:Callestablishmentprocedures;Callclearingprocedures;Callinformationphaseprocedures;Miscellaneousprocedures.
3、DTMFmanage;Usernotification;IncallModifymanage;CRSSfunctionmanage.1.1CCStateChartFSMstateCCstateDescribeU0CC_U0NocallexistsU01CC_U01MMConnectionpending,Thisstateexistsforamobileoriginatingcall,whenthemobilestationrequeststheestablishmentofaMMconnection.U1CC_U1CChassendS
4、ETUPCC_U3CChasreceivedCALLPROCEEDINGCC_U4CChasreceivedALERTU6CC_U6MShasreceivedSETUPU8CC_U8MShassentCONNECT.U9CC_U9MShassentCALLCONFIRMU9CC_U7MShassentALERTINGU10CC_U26MOmodifying.CC_U27MTmodifying.CC_U10Thecallactive,referU26,U27,REESET.REESETMMconnectionisdisconnected
5、andjustreestablishing,theCCU10.U11CC_U11Thisstateexistswhenthemobilestationhasrequestedthenetworktocleartheend-to-endconnection(ifany)andiswaitingforaresponse.U12CC_U12Thisstateexistswhenthemobilestationhasreceivedaninvitationtodisconnectbecausethenetworkhasdisconnected
6、theend-to-endconnection(ifany).U19CC_U19ThisstateexistswhentheMShasrequestedthenetworktoreleaseandiswaitingforaresponse.GENEDifferentCCstatewilldosamerespondtomessagewilldealinvirtualFSMstateGENE..CallstatesatthemobilestationsideoftheinterfaceThestateswhichmayexistonthe
7、mobilestationsideoftheradiointerfacearedefinedinthisclause.NOTE:StatesU0.1,U0.2,U0.3,U0.4,U0.5,U0.6,U26,andU27areGSMspecific.AllotherstatesareITU-Tdefined.U0000000NullNocallexistsU0.1000010MMConnectionpendingThisstateexistsforamobileoriginatingcall,whenthemobilestationr
8、equeststheestablishmentofaMMconnectionU1000001CallinitiatedThisstateexistsforamobileoriginatingcall,whentheMSr
