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GSM (Inside MS Layer 3 - MO) - 30

Inside MS Layer 3 - MO[Under GSM >> Signaling]

Let us have a brief look at primitive interfaces inside MS Layer 3 for Mobile Originated Call.

MN CC MM RR AIR
User dials call. Adaptation layer (MN) receive ATD command. MN sends setup-req to PS/CC.
MNCC-SETUP-REQ
MMCC-EST-REQ
RR-EST-REQ
(CM SERV REQ)
RACH, CHAN REQ Reason: MO call
AGCH, IMM ASS
SDCCH, CM SERV REQ
Got dedicated signaling channel. L2 connection established with SABM/UA.
RR-EST-CNF
RR connection established
MM/AUTH REQ
MM/AUTH RES
RR/CIPH MODE CMD
RR/CIPH MODE CMP
RR-SYNC-IND
MMCC-EST-CNF
MM connection established
CC/SETUP
CC/CALL PROC
MNCC-CALL-PROC-IND
RR/ASSIGN CMD
L2 SABM/UA
RR/ASSIGN CMP
TCH assigned, Signaling will be over FACCH.
RR-SYNC-IND
MMCC-SYNC-IND
FACCH, CC/ALERT
Called party ringing.
MNCC-ALERT-IND
CC/CONNECT
Called party answered.
MNCC-SETUP-CNF
CC/CONN ACK
Call in progress.
Measurment, TA and Power control over SACCH.

References: GSM Networks book by Heine, Signaling diagrams from 24.007/24.008 (R99)

Copyright © Samir Amberkar 2010§

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