《GSM协议栈原理》PPT课件

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1、GSM/GPRSProtocolStackArchitectureVitoTaiOutlineGSM/GPRSProtocolStackArchitectureIntroducethearchitectureandallmodulesofProtocolstackCommonProceduresIncludesgeneralprocedures,likeLU,MOcall,GPRSATTACH,andetc.,forillustrationofthefunctionalityandinteractionofmodulesofProtocolstack.OutlineGSM/GPRSProtoc

2、olStackArchitectureIntroductionL4NASASDataSIMCommonProceduresIntroduction:Taskv.s.ModuleOneModuleimplementsonelayerorgroupsoffunctionalities.TaskistheunitofOSschedulingThecommunicationbetweenModulesisbyPrimitives(Messages)Moreoverheadininter-taskcommunicationPutmodulesintoonetaskSharecommonmemoryLou

3、sycommunicationsSharethesamepriorityOtherconsiderationGeneralpriorityarrangement:lowerlayerhigherpriorityTask1KALModule1Task2Module3Module2SAPMCDTSTSAPIntroduction:Taskmainwhile(1){receive_msg_ext_q(task_ext_qid,¤t_ilm);process_ilm(¤t_ilm);/*processexternalILM*/while(receive_msg_int_q(ta

4、sk_entry_ptr->task_indx,¤t_ilm)){process_ilm(¤t_ilm);/*processinternalILM*/}}voidprocess_ilm(ilm_struct*current_ilm){switch(current_ilm->dest_mod_id){caseMOD_CSM:csm_main(current_ilm);break;//……while(1){receive_msg_ext_q(task_ext_qid,¤t_ilm);/*processexternalILM*/mm_main(¤t_i

5、lm);free_ilm(¤t_ilm);}Multi-moduleSingle-moduleSAPheaders:definemessageidsDriverinterfaceASNfileofCCHeaderfileofCCSourcefileofCCMcd_parserGeneratedheaderfileHeadersofcommonlocalstructureHeadersofstructuresforprimitivesHeadersofcommonusedenumsASNsofcommonusedandSSACTFilesIntroduction:DirectoryS

6、tructureLayer4TheinterfacebetweenPSandMMI/ATL4-L4C(1/9)L4CLayer4controllerCo-ordinateallL4modulestoperformtherequestsfromATorMMIInterfacesThereareinterfacesbetweenallmodulesinL4PPP_L4C_SAP-PPPL4C_ABM_SAP-ABMSourcemcu/ps/l4/l4cL4-L4A&ATCI(2/9)L4ALayer4adaptationTranslatefunctioncallstoprimitivesbetwe

7、enMMIandL4C.CodegeneratedbytoolbaseonanExcelfileSourcemcu/ps/l4/l4aATCISub-moduleofL4CATcommandInterpreterSourcemcu/ps/l4/l4cL4–RAC(3/9)RegistrationAccessControlGSM/GPRSregistrationmanagementPLMNList/