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GSM (Inside MS Layer 3 - Call Rel) - 32

Inside MS Layer 3 - Call Release [Under GSM >> Signaling]

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

1) Call disconnected by MS

MN CC MM RR AIR
User hangs up the call. Adaptation layer (MN) receive AT command, ATH.
MNCC-DISC-REQ
CC/DISCONNECT
CC/RELEASE
MNCC-REL-IND
Adaptation layer informs release to user.
CC/RELEASE COMPLETE
MMCC-REL-REQ
CC released. MM wait for RR release. CC do not need confirmation as it is already released.
RR/CHAN REL
RR-REL-IND
L2 disconnect
L2 disconnect with DISC/UA frame.

2) Call disconnected from other party

MN CC MM RR AIR
Other party has disconnected the call.
CC/DISCONNECT
MNCC-DISC-IND
CC/RELEASE
MNCC-REL-REQ
Adaptation layer informs user about call disconnection.
MNCC-REL-CNF
MMCC-REL-REQ
CC released. MM request RR release.
RR-REL-REQ
RR/CHAN REL
L2 disconnect
L2 disconnect with DISC/UA frame.

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

Copyright © Samir Amberkar 2010§

Inside MS Layer 3 - MT « GSM Index » SAT - 1