The GSM Signalling Protocol Stack (Um / A-bis / A Interfaces) contains the following
protocols:
· Layer 1 Protocol
TDMA – Time Division Multiple Access
G.703 – ITU PCM frame structure
MTP – Message Transfer Part
· Layer 2 Protocols
LAPDm Link Access Protocol D-channel-mobile
LAPD Link Access Protocol D-Channel
· Layer 3 Protocols
RR – Radio Resource Management
MM – Mobility Management
CM – Connection management
BTSM – Base Transceiver Station Management
SCCP – Signalling Connection Control Part
BSSMAP – Base Station Subsystem Management Application
Part
DTAP – Direct Transfer Application Part
Note: the DTAP and BSSMAP are together referred to as the Base Station Subsystem
Application Part (BSSAP).
The purpose and functionality of these protocols will be covered below, dealt with by
interface i.e. Um, A-bis and A interfaces.
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