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 GSM, the Global System for Mobile communications, is a digital cellular communications system which has rapidly gained acceptance and market share worldwide, although it was initially developed in a European context.
 In addition to digital transmission, GSM incorporates many advanced services and features, including ISDN compatibility and worldwide roaming in other GSM networks.
 The advanced services and architecture of GSM have made it a model for future third-generation cellular systems, such as UMTS. This paper will give an overview of the services offered by GSM, the system architecture, the radio transmission structure, and the signalling functional architecture.

 Some of the basic criteria for their proposed system were
o Good subjective speech quality
o Low terminal and service cost
o Support for international roaming
o Ability to support handheld terminals
o Support for range of new services and facilities
o Spectral efficiency
o ISDN compatibility

 GSM was designed having interoperability with ISDN in mind, and the services provided by GSM are a subset of the standard ISDN services. Speech is the most basic, and most important, teleservice provided by GSM.



 System architecture
o The functional architecture of a GSM system can be broadly divided into the mobile station, the base station subsystem, and the network subsystem. Each subsystem is comprised of functional entities which communicate through the various interfaces using specified protocols.

 We will discuss about following topics in GSM Seminar.
o Mobile Station (MS)
o Base Transceiver Station (BTS)
o Base Station Controller (BSC)
o Mobile Switching Centre (MSC)
o Visiting Location Register (VLR)
o Home Location Register (HLR)
o Authentication Centre (AUC)
o Equipment Identity Register (EIR)
o Operation & Maintenance Centre (OMC)
o Call Processing in GSM
o Value Added Services





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