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Overview of the Global System for Mobile Communications
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"Overview of the Global System for Mobile Communications
John Scourias
jscouria@www.shoshin.uwaterloo.ca
Table of Contents
1. History of GSM
2. Services provided by GSM
3. Architecture of the GSM network
3.1. Mobile Station
3.2. Base Station Subsystem
3.3. Network Subsystem
4. Radio link aspects
4.1. Multiple access and channel structure
4.1.1. Traffic channels
4.1.2. Control channels
4.1.3. Burst structure
4.2. Speech coding
4.3. Channel coding and modulation
4.4. Multipath equalization
4.5. Frequency hopping
4.6. Discontinuous transmission
4.7. Discontinuous reception
4.8. Power control
5. Network aspects
5.1. Radio resources management
5.1.1. Handover
5.2. Mobility management
5.2.1. Location updating
5.2.2. Authentication and security
5.3. Communication management
5.3.1. Call routing
6. Conclusion and comments
History of GSM
During the early 1980s, analog cellular telephone systems were experiencing
rapid growth in Europe, particularly in Scandinavia and the United Kingdom,
but also in France and Germany. Each country developed its own system,
which was incompatible with everyone else's in equipment and operation.
This was an undesirable situation, because not only was the mobile equipment
limited to operation within national boundaries, which in a unified Europe
were increasingly unimportant, but there was also a very limited
market for each type of equipment, so economies of scale and the subsequent
savings could not be realized.
The Europeans realized this early on, and in 1982 the Conference of European
Posts and Telegraphs (CEPT) formed a study group called the Groupe
Spécial Mobile (GSM) to study and develop a pan-European public land
mobile system. The proposed system had to meet certain criteria:
Good subjective speech quality
Low terminal and service cost
Support for international roaming
Ability to support handheld terminals
Support for rang"
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