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1、CourseDescription1.IntroductiontotheCourseTheGSMcommunicationflowincludesthecallbasicflowandsignalingbasicflow.Thecallflowincludesthemobileoriginatedflow,mobileterminatedflow,andtandemcallflow.Thesignalingbasicflowincludestheauthenticationflow,locationregistrationflow,callre-
2、setupflow,intra-BSChandoverflow,inter-BSChandoverflow,inter-MSChandoverflow,mobileoriginatedSMflow,mobileterminatedSMflow,anddirectedretryflow.Theseflowsdescribeactivitiesofmobilesubscribersfromtheangleofthesystem,anddescribetherelationofGSMcomponentsinthecallflowandsignaling
3、flow.Mobilityfeaturesaremainlydescribed.2.ObjectivesThiscoursedescribesthecooperativeoperationsoftheGSMsystem,includingcall,locationupdate,handover,andshortmessage.Thedescriptionoftheflowfocusesonthemobilityfeatures.Specificsignalingdetailsarenotdescribed.Toobtainmoredetailed
4、contents,seeGSMspecificationsoftheETSI.Throughthelearningofthiscourse,masterthefollowing:SignalingprocedureoflocationregistrationbyamobilesubscriberSignalingprocedureofaMS-originatedcallSignalingprocedureofaMS-terminatedcallSignalingprocedureofMSCtandemingcallIntra-BSChandove
5、rsignalingprocedureInter-BSChandoversignalingprocedureInter-MSChandoversignalingprocedureCallre-setupsignalingprocedureAfterthelearningofthesesignalingflows,youcanlearnmoreabouttheGSMsystemprinciplesandbetterunderstandfunctionsofentitiessuchasMS,BTS,BSC,MSC,VLR,HLR,andSC.3.Re
6、ferencesGSMspecificationsofETSIare0408and0808.LocationupdateflowMSswitch-offflowMS-originatedflowMS-terminatedflowIntra-cellHandoverIntra-BSCInter-cellHandoverIntra-MSCInter-BSCHandoverPoint-to-pointShortMessageFlow(withencryption)—SMTransmittinginIdleStatusPoint-to-pointShor
7、tMessageFlow(withencryption)—SMReceivinginIdleStatusPoint-to-pointShortMessageFlow(withencryption)—SMTransmittinginConversationPoint-to-pointShortMessageFlow(withencryption)—SMReceivinginConversation
