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1、GSM/GPRS Protocol Stack ArchitectureVito TaiOutlinenGSM/GPRS Protocol Stack ArchitecturenIntroduce the architecture and all modules of Protocol stacknCommon ProceduresnIncludes general procedures,like LU,MO call,GPRS ATTACH,and etc.,for illustration of the functionality and interaction of modules of
2、 Protocol stack.OutlinenGSM/GPRS Protocol Stack ArchitecturenIntroductionnL4nNASnASnDatanSIMnCommon ProceduresIntroduction:Task v.s.ModulenOne Module implements one layer or groups of functionalities.nTask is the unit of OS schedulingnThe communication between Modules is by Primitives(Messages)nMore
3、 overhead in inter-task communication nPut modules into one tasknShare common memorynLousy communicationsnShare the same prioritynOther considerationnGeneral priority arrangement:lower layer higher priorityTask1KALModule1Task2Module3Module2SAPMCDTSTSAPIntroduction:Task main while(1)receive_msg_ext_q
4、(task_ext_qid,¤t_ilm);process_ilm(¤t_ilm);/*process external ILM*/while(receive_msg_int_q(task_entry_ptr-task_indx,¤t_ilm)process_ilm(¤t_ilm);/*process internal ILM*/void process_ilm(ilm_struct*current_ilm)switch(current_ilm-dest_mod_id)case MOD_CSM:csm_main(current_ilm);brea
5、k;/while(1)receive_msg_ext_q(task_ext_qid,¤t_ilm);/*process external ILM*/mm_main(¤t_ilm);free_ilm(¤t_ilm);Multi-moduleMulti-moduleSingle-moduleSingle-moduleSAP headers:define message idsDriver interfaceASN file of CCHeader file of CCSource file of CCMcd_parser Generated header fil
6、eHeaders of common local structureHeaders of structures for primitivesHeaders of common used enumsASNs of common used and SS ACT FilesIntroduction:Directory StructureLayer 4nThe interface between PS and MMI/ATL4-L4C(1/9)nL4CnLayer 4 controllernCo-ordinate all L4 modules to perform the requests from
7、AT or MMInInterfaces nThere are interfaces between all modules in L4nPPP_L4C_SAP -PPPnL4C_ABM_SAP-ABMnSourcenmcu/ps/l4/l4cL4-L4A&ATCI(2/9)nL4AnLayer 4 adaptationnTranslate function calls to primitives between MMI and L4C.nCode generated by tool base on an Excel filenSourcenmcu/ps/l4/l4anATCInSub-mod
8、ule of L4CnAT command InterpreternSourcenmcu/ps/l4/l4cL4 RAC(3/9)nRegistration Access ControlnGSM/GPRS registration managementnPLMN List/SelectionnCell power level reportnInterfacenL4C_RAC_SAP L4CnGMMREG_SAP MMnMMIAS_SAP-RMPCnSourcenmcu/ps/l4/racL4 TCM(4/9)nTerminal Context ManagementnHandle PDP con
9、text profilesnQoS,PDP address,PDP typesnRequest to activate PDP contextsnRelay of Data transfernInterfacesnTCM_L4C_SAP L4CnSMREG_SAP SMnSNDCP_REG_SAP-SNDCPnTCM_PPP_SAP PPPnTCM_TCPIP_SAP-TCPIPnSourcenmcupsl4tcmL4 SMSAL(5/9)nSMS Application LayernMessage box of ME&SIMnTransmitting and receiving SMSnCe
10、ll Broadcast managementnInterfacesnSMSAL_L4C_SAP L4CnSMSAL_SOC_SAP SOCnMNSMS_SAP SMSnSMSAL_AS_SAP-RMPCnSourcenmcu/ps/l4/smsalL4 TCM/SMSAL in WAP/GPRS(6/9)nTCM will relay IP packets to SNDCP,and vice versa.nSMSAL forwards PUSH message to SocketL4 CSM(7/9)nCall Service ManagementnBearer Capability Han
11、dlingnCODEC attachment managementnCSD/Fax activation/deactivationnCall information maintainingnCall related SS handlingnInterfacesnCSM_L4C_SAP L4CnMNCC_SAP CCnCSM_TDT_SAP TDT of DatanCSM_L2R_SAP L2R of DatanMNSS_SAP-CISSnSourcenmcu/ps/l4/csmL4 SMU(8/9)nSecurity Management UnitnSecurity CheckingnPhon
12、e locknCHV1/CHV2nPersonalization(ETSI 02.22)nAutolocknInterfacesnSMU_L4C_SAP L4CnPS_SIM_SAP-SIMnSourcenmcu/ps/l4/smuL4-PHB&UEM(9/9)nPhonebooknIdentify Emergency callnPhonebook managementnUser Equipment ManagementnPeripheral managementNASnNon Access StratumNAS CISS(1/12)nCall Independent Supplemental
13、 Servicen3GPP/ETSI specifications:n22.08122.088,22.091,22.091,22.093,22.072nSAPsnMM_SS_SAP-MMnMNSS_SAP -CSM of L4nSourcenmcu/ps/cc-ss/ssNAS CC(2/12)nCall Controln3GPP/ETSI specificationsn24.008(Clause 5)nSAPsnMM_CC_SAP MMnMNCC_SAP -CSM of L4nSourcenmcu/ps/cc-ss/ccNAS SMS(3/12)nShort Message Servicen
14、3GPP/ETSI specification:n23.040nSAPsnMM_SMS_SAP -MMnMNSMS_SAP -SMSAL of L4nLLC_SMS_SAP -LLC(GPRS-only)nSourcenmcu/ps/smsNAS-MM/GMM(4/12)nMobility Managementn3GPP/ETSI specificationn24.008(Clause 4)nSAPsnMM_CC_SAP -CCnMM_SS_SAP -CISSnMM_SMS_SAP-SMSnGMMREG_SAP RAC of L4nMM_AS_SAP -RRnGMM_SM_SAP-SMnLLC
15、_GMM_SAP-LLCNAS-MM/GMM(5/12)nSourcenmcu/ps/mm/cmm -CS domainnmcu/ps/mm/pmm -PS domainnmcu/ps/mm/common -commonnSingle task,single Module,Two FSMsNAS SM(6/12)nSession Managementn3GPP/ETSI specification:n24.008(Clause 6)nSAPsnGMM_SM_SAP MMnSMREG_SAP -TCM of L4nSM_DATA_PLANE_SAP SNDCPnSourcenmcu/ps/smN
16、AS SNDCP(7/12)nSubNetwork Dependency Convergence Protocoln3GPP/ETSI specificationn04.65nRFC1144(for TCP/IP header compression)nSAPsnSM_DATA_PLANE_SAP -SMnSM_REG_SAP -TCMnLLC_SNDCP_SAP -LLCnSourcenmcu/ps/sndcpNAS LLC(8/12)nLogical Link Controln3GPP/ETSI specificationn04.64nSAPsnLLC_GMM_SAP -GMMnLLC_S
17、NDCP_SAP-SNDCPnLLC_SMS_SAP -SMSnLLC_RLC_SAP -RLCnSourcenmcu/ps/llcNAS PPP(9/12)nPoint to Point ProtocolnRFC specificationn1661,1662,1332,1877,1334,1994nTwo RolesnServer in GPRS dial-upnClient in WAP over CSDnSAPs(for GPRS dialup)nPPP_L4C_SAP -L4C of L4nPPP_TCM_SAP -TCM of L4nUart driver interfacenSo
18、urcenmcu/ps/pppNAS PPP in GPRS dial-up(10/12)nReference model in ETSI 07.60NAS-PPP in WAP/CSD(11/12)nSAPsnPPP_TCPIP_SAP -TCPIPnPPP_TDT_SAP -TDTnL2R_PPP_SAP -L2RNAS PPP of Two roles(12/12)nWhy not two tasks?nSave stack,Task control block,etc.nPriority of PPP TasknPPP is in lower layer than WAP and TC
19、P/IP in WAP/CSD,WAP is the same position as MMIn In GPRS Dial-up PPP has nothing to do with MMI,but busty GPRS data may affect MMI if PPP has higher priority than MMInSolution:make PPP lower priority,and rise it when needed.nIs it possible that two modes of it are active at the same time?nYesData Ta
20、skData RLP(1/3)nRadio Link Protocoln3GPP/ETSI specificationn24.022nSAPsnL2R_RLP_SAP -L2RnRLP_RA_SAP -L1(callback)nSourcenmcu/ps/data/rlpData-L2R(2/3)nLayer 2 Relayn3GPP/ETSI specificationn27.001,27.002nSAPsnCSM_L2R_SAP CSM of L4nL2R_RLP_SAP -L2RnPPP_L2R_SAP -PPPnUART drivernSourcenmcu/ps/data/l2rDat
21、a TDT(3/3)nTransparent Data Transfern3GPP/ETSI specificationn27.001,27.002nSAPsnCSM_TDT_SAP CSM of L4nPPP_TDT_SAP -PPPnLayer1nSourcenmcu/ps/data/tdtSIMnSIM managernSIM Application Toolkitn3GPP/ETSI Specificationsn11.11,11.14nSAPsnSIM_PS_SAP -to all modulesnFunction interface with SIM drivernSourcenm
22、cu/ps/simAS(RR)nAccess StratumRRnRadio ResourcenMost modules are in RR taskn3GPP/ETSI Specificationsn03.22,04.18,04.60,05.02,05.08RR-RRM(1/10)nRadio Resource Management InitnPower on PLMN SelectionnCell selectionnManual PLMN SelectionnHome PLMN SearchnRecovery to normal servicenSAPsnRRM_RMPC_SAP RMP
23、CnMM_AS_SAP MMnSourcenmcu/ps/rr/rrmRR-RMPC(2/10)nRadio Resource Management on CCCH or PCCCHnDecision rule:SI13 will indicate if P channel is supported in the cellnIdle ModenMonitor(packet)system information on BCCH or PBCCHnPerform cell reselectionnPerform(packet)channel access on CCCH or PCCCHnResp
24、onse to(packet)paging messages on CCCH or PCCCHRR-RMPC(3/10)nDedicated modenMeasurements on SDCCH/TCHnMonitoring neighboring cellsnMonitor System Information on SACCHnPerform cell reselection(NW initiated)nDedicated mode proceduresnSAPsnMMI_AS_SAP MMInSMSAL_AS_SAP SMSALnMM_AS_SAP MMnRRM_RMPC_SAP RRM
25、nRMC_LAPDM_SAP RMCRR-RMPC(4/10)nRLC_RMPC_SAP RLCnMAC_RMPC_SAP MACnRMPC_MPAL_SAP-MPALnSourcenmcu/ps/rr/rmpnmcu/ps/rr/rmcnmcu/ps/rr/srcRR-LAPDm(5/10)nLayer 2nProvide SAPI0/SAPI3 connectionsnTransfer layer 3 messagenSequence controlnSegmentation and re-assembly of framesnSAPsnRMC_LAPDM_SAP RMCnLAPDM_MP
26、AL_SAP MPALnSourcenmcu/ps/rr/lapdmMobile Physical Abstraction LayerAdaptation to L1SAPsRRM_MPAL_SAP RRMRMPC_MPAL_SAP RMPCMAC_MPAL_SAP MACSourcemcu/ps/rr/mpalRR-MPAL(6/10)RR-RLC(7/10)nRadio Link ControlnRequest TBF establishment or releasenSegmentation of LLC PDUsnAcknowledged/Unacknowledged data tra
27、nsfernSAPsnLLC_RLC_SAP LLCnRLC_REASM_SAP REASMnRLC_MAC_SAP MACnRLC_RMPC_SAP RMPCnSourcenmcu/ps/rr/rlcReassembleTo put non realtime constraint task into another TaskRe-assemble Downlink RLC/MAC blocksSAPsLLC_RLC_SAP LLCRLC_REASM_SAP REASMSourcemcu/ps/rr/rlcReasm(8/10)RR-MAC(9/10)nMedium Access Contro
28、lnHandling TBF establishment and releasenTransfer or receive RLC data blocksnHandling control messages received on PACCHnPacket Resource Request,Packet PDCH release and etcnForward PMO or PCCO to RMPCnHandling PSI messages received on PACCHnSending Packet Measurement Report on PACCHSAPsRLC_MAC_SAP R
29、LCMAC_RMPC_SAP RMPCMAC_MPAL_SAP MPALSourcemcu/ps/rr/macRR-MAC(10/10)OutlinenGSM/GPRS Protocol Stack ArchitecturenCommon ProceduresnPower OnnLocation UpdatenMO callnGPRS AttachnPDP context ActivationnTBF OperationPower On ProcedurenConditionnPower on by long press Power keynAll tasks are created and
30、initialized when the target is powered,but only if“long”press was detected,power on procedure will beginnPlayersnSIM,L4nNVRAM,MM,RRPower On-1Read all necessary EFs Power On-2Read NVRAM via L4CIf Not Flight ModePower On-3Read IMEI,MSCAP,etc.Read from NVRAMSearch Any CellPower On-4Read all security re
31、cord from NVRAMCheck Phone LockStart SIM Driver Power On-5Input PIN Personalization Lock Handling Power On-6Initialize SMS Service Parameter Read LDNPower On-7Read all EFs for MM/RRSearch Normal ServicePower On-8Read SMSLocation UpdatenConditionnA suitable cell was found when power on PLMN selection
32、nPlayersnMM,RRnL4C,RACLocation Update-1Location Update-2Location Update-3MO callnConditionnA normal service cell is camped-onnPlayersnL4C,CSM,CC,MM,RRnMMI,UEM,PHBMO call-1Check ECC&PHBMO Call-2MO call-3TCH Assigned MO call-4Attach User SpeechGPRS AttachnConditionnMS is idle in a cell that supports G
33、PRSnMS is requested for GPRS Attach by AT commandnPlayersnL4C,RAC,MM,LLC,RRGPRS Attach 1Read SI13/PSI1GPRS Attach-2PDP Context ActivationnConditionnGPRS AttachednPDP Context activation is triggered by dial-up from PCnPlayersnL4C,TCM,PPP,SMnLLC,MM,RRPDP Context Activation 1Atd*99#(UART)LCP/PAP/IPCPPD
34、P Context Activation 2(UART)IPCP ACKPDP Context Activation 3Read PPP frame from UARTWrite PPP frame from UARTUplink TBF OperationnConditionnIdle state,GPRS service is availablenOne uplink LL-PDUnOne-phase accessnPlayersnRLC,MAC,RMC,MPAL,REASMnLLC,L1UL TBF 1UL TBF 2UL TBF 3ConditionIdle state.GPRS service is available.One downlink LL-PDUPlayersRLC,MAC,RMC,MPAL,REASM,LLC,L1Downlink TBF OperationDL TBF 1DL TBF 2Q&A