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GSM (Inside MS Layer 3 - MT) - 31

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

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

MN CC MM RR AIR
PCH, PAG REQ
Paging is done in all cells within location area to which MS is currently located.
RACH, CHAN REQ Reason: Page response
AGCH, IMM ASS
SDCCH, PAGE RES
Got dedicated signaling channel. L2 connection established with SABM/UA.
RR-EST-IND
MM/AUTH REQ
MM/AUTH RES
RR/CIPH MODE CMD
RR/CIPH MODE CMP
RR-SYNC-IND
MMCC-EST-IND contain SETUP message.
CC/SETUP
MNCC-SETUP-IND
RR/ASSIGN CMD
L2 SABM/UA
RR/ASSIGN CMP
TCH assigned, Signaling will be over FACCH.
RR-SYNC-IND
MN informs incoming call to user with AT+CRING indication MS ringing now.
MM-SYNC-IND
MNCC-ALERT-REQ
User accepts the call.
CC/ALERT
MNCC-SETUP-RES
CC/CONNECT
CC/CONNECT ACK
MNCC-SETUP-CMPL-IND
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§

Inside MS Layer 3 - MO « GSM Index » Inside MS Layer 3 - Call Rel