What is mobile communication system?

mobile phones . … are known as the “second generation” (2G). Since the introduction of 2G cell phones, various enhancements have been made in order to provide data services and applications such as Internet browsing, two-way text messaging, still-image transmission, and mobile access by personal computers.

The first public cellular telephone system (first-generation, 1G), called Advanced Mobile Phone System (AMPS) [8, 21], was introduced in 1979 in the United States. During the early 1980s, several incompatible cellular systems (TACS, NMT, C450, etc.) were introduced in Western Europe.

Explanation: Like all other first generation, analog, cellular systems, AMPS and ETACS use frequency modulation (FM) and frequency division duplex (FDD) for radio transmission. 6.

Advanced Mobile Phone Service (AMPS) is a standard system for Analog signal cellular telephone service in the United States and is also used in other countries. It is based on the initial electromagnetic radiation spectrum allocation for cellular service by the Federal Communications Commission (FCC) in 1970.

In the advanced mobile phone system (AMPS), the cellular system employed in the United States, different callers use separate frequency slots via FDMA . When one telephone call is completed, a network-managing computer at the cellular base station reassigns the released frequency slot to a new caller.

AMPS uses analog technology GSM uses digital technology AMPS has poor performance for data transfer Both systems use control channels to initiate calls. AMPS uses 21 control channels while GSM uses 3. AMPS is less secure than GSM GSM has the SIM smart card which holds the user’s personal information and phone settings.