Gsm Technology

Topics: GSM, Mobile phone, Cellular network Pages: 39 (10269 words) Published: April 8, 2012
An overview of the GSM system

Javier Gozálvez Sempere

Research Engineer in Mobile Communications
Communications Division
Department of Electronic&Electrical Engineering
University of Strathclyde
Glasgow, Scotland

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Table of Contents

1 History of the cellular mobile radio and GSM
2 Cellular systems

2.1 The cellular structure
2.2 Cluster
2.3 Types of cells

2.3.1 Macrocells
2.3.2 Microcells
2.3.3 Selective cells
2.3.4 Umbrella cells
3 The transition from analog to digital technology

3.1 The capacity of the system
3.2 Compatibility with other systems such as ISDN
3.3 Aspects of quality

4 The GSM network

4.1 Architecture of the GSM network

4.1.1 Mobile Station The Terminal The SIM
4.1.2 The Base Station Subsystem The Base Transceiver Station The Base Station Controller
4.1.3 The Network and Switching Subsystem The Mobile services Switching Center (MSC) The Gateway Mobile services Switching Center Home Location Register (HLR) Visitor Location Register (VLR) The Authentication Center (AuC) The Equipment Identity Register (EIR) The GSM Interworking Unit (GIWU)
4.1.4 The Operation and Support Subsystem (OSS)

4.2 The geographical areas of the GSM network
4.3 The GSM functions

4.3.1 Transmission
4.3.2 Radio Resources management (RR) Handover
4.3.3 Mobility Management Location management Authentication and security
4.3.4 Communication Management (CM) Call Control (CC) Supplementary Services management Short Message Services management
4.3.5 Operation, Administration and Maintenance (OAM) 5 The GSM radio interface

5.1 Frequency allocation
5.2 Multiple access scheme

5.2.1 FDMA and TDMA
5.2.2 Channel structure Traffic channels (TCH) Control channels Broadcast channels Common Control Channels Dedicated Control Channels Associated Control Channels 5.2.3 Burst structure
5.2.4 Frequency hopping

5.3 From source information to radio waves

5.3.1 Speech coding
5.3.2 Channel coding Channel coding for the GSM data TCH channels Channel coding for the GSM speech channels Channel coding for the GSM control channels 5.3.3 Interleaving Interleaving for the GSM control channels Interleaving for the GSM speech channels Interleaving for the GSM data TCH channels 5.3.4 Burst assembling

5.3.5 Ciphering
5.3.6 Modulation

5.4 Discontinuous transmission (DTX)
5.5 Timing advance
5.6 Power control
5.7 Discontinuous reception
5.8 Multipath and equalisation

6 GSM services

6.1 Teleservices
6.2 Bearer services
6.3 Supplementary Services

7 Conclusion
Other GSM sites

The Global System for Mobile...
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