The protocol stack for a Global System for Mobile Communication (GSM) cellular
handset follows the basic concepts of the ISO OSI 7 layer stack in so much as it is a
layered architecture. The relationship between the layers as defi ned in the OSI model
and those in GSM are described in the following section along with a breakdown of the
functions performed by each layer ( Figure 4.3 ).
Mobile terminal software
Modem software
L3 Radio Resource
L2 Data link
L1 Control software
Application software
Application suite
UI framework
Hardware: Radio Baseband Applications processor
Middleware ...
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