International Journal for Technological Research in Engineering (IJTRE)
Evolution is inevitable, be it in the Nature or in the Man Made stuff. GSM (Global System for Mobile communication, originally Groupe Special Mobile), is a standard set developed by the European Telecommunications Standards Institute (ETSI) to describe protocols for Second Generation (2G) digital cellular networks used by mobile phones. It is the most widely used 2nd generation digital cellular standard, with over 3 billion subscribers in some 213 countries and adding about 1000 new users per minute! Originally GSM was developed in the early 1980s and first deployed in 1991; GSM is a TDMA+FDMA system, providing wide area voice communications using 200 KHz carriers. Subsequently, GSM evolved into a 2.5G standard with the introduction of packet data transmission technology General Packet Radio Service (GPRS) and higher data rates via higher order modulation schemes Enhanced Data rates in GSM Environment (EDGE).