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1、GSM 协议栈设计结构1 Architecture of GSM2 CC2.1 SummaryIn GSM protocol, both SS protocol and CC protocol are sub-protocol of CM protocol. The CC entity uses box to communicate with API, MM and RR. Each CC entity shall communicate with the correspondent peer entity using its own MM connection.2.2 Object Mode
2、l DiagramIn CC module, different CC context needs interwork with others, so all CC context are organized in a queue. Every CC context will manage a call.2.3 Objects DescriptionThe functions of CC entity as following:Call establishment procedures;Call clearing procedures;Call information phase proced
3、ures;Miscellaneous procedures.DTMF manage;User notification;In call Modify manage;CRSS function manage.2.4 CC State ChartFSM stateCC stateDescribeU0CC_U0No call existsU01CC_U01MM Connection pending, This state exists for a mobile originating call, when the mobile station requests the establishment o
4、f a MM connection.U1CC_U1CC has send SETUP CC_U3CC has received CALL PROCEEDINGCC_U4CC has received ALERTU6CC_U6MS has received SETUPU8CC_U8MS has sent CONNECT.U9CC_U9MS has sent CALL CONFIRMU9CC_U7MS has sent ALERTINGU10CC_U26MO modifying.CC_U27MT modifying.CC_U10The call active, refer U26, U27, RE
5、ESET.REESETMM connection is disconnected and just reestablishing, the CC U10.U11CC_U11This state exists when the mobile station has requested the network to clear the end-to-end connection (if any) and is waiting for a response.U12CC_U12This state exists when the mobile station has received an invit
6、ation to disconnect because the network has disconnected the end-to-end connection (if any).U19CC_U19This state exists when the MS has requested the network to release and is waiting for a response.GENEDifferent CC state will do same respond to message will deal in virtual FSM state GENE.Call states
7、 at the mobile station side of the interfaceThe states which may exist on the mobile station side of the radio interface are defined in this clause.NOTE:States U0.1, U0.2, U0.3, U0.4, U0.5, U0.6, U26, and U27 are GSM specific. All other states are ITU-T defined.U0000000NullNo call existsU0.1000010MM
8、 Connection pendingThis state exists for a mobile originating call, when the mobile station requests the establishment of a MM connectionU1000001Call initiatedThis state exists for a mobile originating call, when the MS requests call establishment from the networkU3000011Mobile originating call proc
9、eedingThis state exists for a mobile originating call when the mobile station has received acknowledgement that the network has received all call information necessary to effect call establishment.U4000100Call deliveredThis state exists for a mobile originating call, when the calling mobile station
10、has received an indication that remote user alerting has been initiatedU6000110Call presentthis state exists for a mobile terminating call when the mobile station has received a call establishment request but has not yet responded.U7000111Call receivedThis state exists for a mobile terminating call
11、when the mobile station has indicated alerting but has not yet answeredU8001000Connect RequestThis state exists for a mobile terminating call, when the mobile station has answered the call and is waiting to be awarded the callU9001001Mobile terminating call confirmedThis state exists for a mobile te
12、rminating call when the mobile station has sent acknowledgement that the mobile station has received all call information necessary to effect call establishmentU10001010ActiveThis state exists for a mobile terminating call when the MS has answered the call. This state exists for a mobile originating
13、 call when the MS has received an indication that the remote user has answered the callU11001011Disconnect requestThis state exists when the mobile station has requested the network to clear the end-to-end connection (if any) and is waiting for a response.U12001100Disconnect indicationThis state exi
14、sts when the mobile station has received an invitation to disconnect because the network has disconnected the end-to-end connection (if any).U19010011Release requestThis state exists when the MS has requested the network to release and is waiting for a response.U26011010Mobile originating modifyThis
15、 state exists when the mobile station has sent a request to the network for a new mode but has not yet received an answer.U27011011Mobile terminating modifyThis state exists when the mobile station has received a request from the network for a new mode and has not yet sent a response to this request.3 SS3.1 SummaryIn GSM protocol, SS protocol is a sub-protocol of CM protocol. The SS entity uses box to communicate with API and MM. Each SS entity shall communicate with the correspondent peer entity using it
