4.1 The Air Interface

Introduction

The ‘Air Interface’ refers to the interface between a mobile terminal and the base station to
which it is affiliated. This interface takes the form of a radio path through the air, hence the
term ‘Air’ interface.
In this section of the course the following air-interface-related topics are covered:

· GSM Frequency Spectrum Allocation
· Radio Access Methods
· GSM Air Interface channels and frames