gsm協(xié)議棧原理ppt課件(完整版)
【正文】 NAS – PPP of Two roles (12/12) ? Why not two tasks ? ? Save stack,Task control block, etc. ? Priority of PPP Task ? PPP is in lower layer than WAP and TCP/IP in WAP/CSD, WAP is the same position as MMI ? In GPRS Dialup PPP has nothing to do with MMI, but busty GPRS data may affect MMI if PPP has higher priority than MMI ? Solution: make PPP lower priority, and rise it when needed. ? Is it possible that two modes of it are active at the same time ? ? Yes Data Task Data – RLP (1/3) ? Radio Link Protocol ? 3GPP/ETSI specification ? ? SAPs ? L2R_RLP_SAP L2R ? RLP_RA_SAP L1 (callback) ? Source ? mcu/ps/data/rlp Data L2R (2/3) ? Layer 2 Relay ? 3GPP/ETSI specification ? , ? SAPs ? CSM_L2R_SAP – CSM of L4 ? L2R_RLP_SAP L2R ? PPP_L2R_SAP PPP ? UART driver ? Source ? mcu/ps/data/l2r Data – TDT (3/3) ? Transparent Data Transfer ? 3GPP/ETSI specification ? , ? SAPs ? CSM_TDT_SAP – CSM of L4 ? PPP_TDT_SAP PPP ? Layer1 ? Source ? mcu/ps/data/tdt SIM ? SIM manager ? SIM Application Toolkit ? 3GPP/ETSI Specifications ? , ? SAPs ? SIM_PS_SAP to all modules ? Function interface with SIM driver ? Source ? mcu/ps/sim AS (RR) ? Access Stratum RR ? Radio Resource ? Most modules are in RR task ? 3GPP/ETSI Specifications ? , , , , RRRRM (1/10) ? Radio Resource Management Init ? Power on PLMN Selection ? Cell selection ? Manual PLMN Selection ? Home PLMN Search ? Recovery to normal service ? SAPs ? RRM_RMPC_SAP – RMPC ? MM_AS_SAP – MM ? Source ? mcu/ps/rr/rrm RRRMPC (2/10) ? Radio Resource Management on CCCH or PCCCH ? Decision rule: SI13 will indicate if P channel is supported in the cell ? Idle Mode ? Monitor (packet) system information on BCCH or PBCCH ? Perform cell reselection ? Perform (packet) channel access on CCCH or PCCCH ? Response to (packet) paging messages on CCCH or PCCCH RRRMPC (3/10) ? Dedicated mode ? Measurements on SDCCH/TCH ? Monitoring neighboring cells ? Monitor System Information on SACCH ? Perform cell reselection (NW initiated) ? Dedicated mode procedures ? SAPs ? MMI_AS_SAP – MMI ? SMSAL_AS_SAP – SMSAL ? MM_AS_SAP – MM ? RRM_RMPC_SAP – RRM ? RMC_LAPDM_SAP – RMC RRRMPC (4/10) ? RLC_RMPC_SAP – RLC ? MAC_RMPC_SAP – MAC ? RMPC_MPAL_SAP MPAL ? Source ? mcu/ps/rr/rmp ? mcu/ps/rr/rmc ? mcu/ps/rr/src RR LAPDm (5/10) ? Layer 2 ? Provide SAPI0/SAPI3 connections ? Transfer layer 3 message ? Sequence control ? Segmentation and reasse
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