GSM is the
most popular method that uses all over the world for mobile communication.
Before going into the details of the GSM System it is worthy to have some
understanding about the history of GSM.
GSM in brief
Conférence Européenne des Postes et Télécommunications (CEPT) began
specifying a European digital telecommunications standard in the 900 MHz
frequency band. This standard later became known as Global System for
Mobile communication (GSM).
In 1986 field tests were
held in Paris to select which digital transmission technology to use.
The choice was Time Division Multiple Access (TDMA) or Frequency
Division Multiple Access (FDMA).
In 1987 a combination of
TDMA and FDMA was selected as the transmission technology for GSM.
In 1989 European
Telecommunication Standards Institute (ETSI) took over responsibility
for GSM specification.
In 1991 the GSM 1800
standard was released.
In 1992 first commercial
Phase 1 GSM networks were launched.