Thread: History of gsm

Mobile communication is one of the fastest growing and most demanding of all telecommunication technologies. The origin of mobile communication followed quickly behind the invention of radio in the late 1800’s. The first allocations of mobile radio were related to the navigation and safety of ships at sea .As radio concept developed, so did it use as a communication tool. The major milestone in the development of wireless communication is summarized follows

• 1906: - Reginald Fesseden successfully transmit human voice over radio .Up until that time, radio communication consisted of transmission of Morse code.

• 1921: -The Detroit Police department used a 2Mhz frequency in the department’s first vehicular radio. The system was only one-way and police had to find a wire line phone to respond to radio message.

• 1930: -Amplitude Modulation (AM) two-way mobile system were in place in the U.S. that took advantage of newly developed mobile transmitter and utilized “push to talk” or half-duplex transmission. By the end the decade channel allocation grew from 11 to 40.

• 1935: -Frequency Modulation (F M) improved audio quality. FM eliminates the freed for large AM transmitter and resulted on radio equipment, which required less power to operate. This mode the use of transmitter in vehicle more practical.

• 1947: -D.H Ring working at Bell Laboratories envisions the cellular concept.

1949: -Radio Common Carriers (RCC) was recognized.

1964: -AT & T introduces Improved Mobile Telephone System (IMTS). 1968: -The FCC began to address issue of new US spectrum requirements, 1979: -The FCC authorized the installation and testing of the first development cellular system in the US.

1991: -The first digital cellular standard (GSM) is launched. INDIAN TELECOM HISTORY Telecom arrived in India at the same time as in the rest of world. India’s first telegraph line was opened for the official use in 1851 and in 1855 these services were made public. The first telephone exchange was commissioned in at Bombay on January 30 1882.strowger bar switching system was undertaken by ITI, Banglore in 1948. In late 1960’s cross bar switching system was introduced, in Indian network. The Plain Old Telephone (POT) service, which was originally operated by private companies, was taken over by the government on 1943. Service regulated by Indian Telegraph was setup to design and developed state of art digital switching system. India decided to adopt GSM standards for cellular mobile telephone services in 1992. Some important years in Indian Telecom History.

1994: - Private sector allowed entering telecom.

1995: - Government grants two mobile licenses per circle.

1997: - Regulator (TRAI) created by Act of Parliament.

2002: - Third and Fourth GSM operators enter fray.

2003: - CDMA operators launch service. Incoming calls made free on mobile.

2004: -Number of mobile connections crosses number of fixed connections. 2007: -Mobile phone subscriber crossed 200 millions mark in India. GSM History

1982-1985: - Conference Europeenne des Postes et Telecommunications began specifying a European digital telecommunications standard; in the 900MHz frequency band. These standards later become known as Global System for Mobile Communication (GSM).

1986: - Field-tested were held in Paris to select which digital transmission technology to use. The choice was TDMA or FDMA.

1987: - A combination of TDMA and FDMA was selected as the transmission technology for GSM. Operators from 12 countries signed a MoU committing themselves to introducing GSM by 1991.

1988: - CEPT began producing GSM specifications for a phased implementation.

1989:- European Telecommunication Standards Institute(ETSI) took over responsibility for GSM specification.

1990: - Phase I specifications were frozen to allow manufacturers to develop network equipments.

1991: - The GSM 1800 standard was released.

1992: -Phase I specification were completed. First commercial phase I GSM networks were launched .the first international roaming agreement was established between Telecom Finland and Vodafone in UK.

1993: -Australia becomes the first non-European country to sign the MoU. First commercial DCS 1800 system was launched in UK.

1994: -The MoU had over 100 signatories covering 60 countries. More GSM networks were launched.

1995: -The specification for the Personal Communication Services (PCS) was developed in the USA.This version of GSM operates at 1900MHz

1996: -The first GSM 1900 systems become available. Those comply with the PCS 1900 standard.

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