gsm協(xié)議棧原理ppt課件(編輯修改稿)
2025-06-01 12:35 本頁面
【文章內(nèi)容簡介】 ? Source ? mcu/ps/sms NAS MM/GMM (4/12) ? Mobility Management ? 3GPP/ETSI specification ? (Clause 4) ? SAPs ? MM_CC_SAP CC ? MM_SS_SAP CISS ? MM_SMS_SAP SMS ? GMMREG_SAP – RAC of L4 ? MM_AS_SAP RR ? GMM_SM_SAP SM ? LLC_GMM_SAP LLC NAS MM/GMM (5/12) ? Source ? mcu/ps/mm/cmm CS domain ? mcu/ps/mm/pmm PS domain ? mcu/ps/mm/mon mon ? Single task, single Module, Two FSMs NAS – SM (6/12) ? Session Management ? 3GPP/ETSI specification: ? (Clause 6) ? SAPs ? GMM_SM_SAP – MM ? SMREG_SAP TCM of L4 ? SM_DATA_PLANE_SAP – SNDCP ? Source ? mcu/ps/sm NAS – SNDCP (7/12) ? SubNetwork Dependency Convergence Protocol ? 3GPP/ETSI specification ? ? RFC1144 (for TCP/IP header pression) ? SAPs ? SM_DATA_PLANE_SAP SM ? SM_REG_SAP TCM ? LLC_SNDCP_SAP LLC ? Source ? mcu/ps/sndcp NAS – LLC (8/12) ? Logical Link Control ? 3GPP/ETSI specification ? ? SAPs ? LLC_GMM_SAP GMM ? LLC_SNDCP_SAP SNDCP ? LLC_SMS_SAP SMS ? LLC_RLC_SAP RLC ? Source ? mcu/ps/llc NAS – PPP (9/12) ? Point to Point Protocol ? RFC specification ? 1661, 1662, 1332, 1877, 1334, 1994 ? Two Roles ? ?Server? – in GPRS dialup ? ?Client? – in WAP over CSD ? SAPs (for GPRS dialup) ? PPP_L4C_SAP L4C of L4 ? PPP_TCM_SAP TCM of L4 ? Uart driver interface ? Source ? mcu/ps/ppp NAS – PPP in GPRS dialup (10/12) ? Reference model in ETSI NAS PPP in WAP/CSD (11/12) ? SAPs ? PPP_TCPIP_SAP TCPIP ? PPP_TDT_SAP TDT ? L2R_PPP_SAP L2R 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
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