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1G

First generation of cellular technology

1G (first generation) refers to the analog mobile telecommunications standards introduced in the late 1970s. The term was later applied retroactively to distinguish these early cellular network systems from later digital generations.

History

Timeline showing the evolution of cellular network standards by generation

The first commercial cellular network was launched by Nippon Telegraph and Telephone (NTT) in Japan in 1979, initially covering Tokyo. Within five years it expanded nationwide and became the world’s first full-scale cellular system. Earlier, Bell Laboratories tested a network around Chicago in 1978.{{cite book

The Nordic countries jointly developed the Nordic Mobile Telephone (NMT) standard, first deployed in Sweden in 1981. NMT introduced international roaming, a feature later adopted by other systems. In 1983, Ameritech launched the first 1G network in the United States using the Advanced Mobile Phone System (AMPS) and the Motorola DynaTAC handset.

By the mid-1980s, 1G networks operated across most of Europe, Asia, and the Middle East. Adoption varied: Western Europe and North America expanded rapidly, while Eastern Europe and parts of Africa adopted the technology later due to economic and political limits.{{cite book

Technology

1G introduced the cellular network concept which divided service areas into cells, each served by a low-power transmitter, which enabled frequency reuse and higher capacity.{{cite book Although some parts of the network backbone used digital signaling, voice transmission between handset and base station remained analog, typically using frequency modulation similar to land mobile radio systems.

Standards

Analog cellular standards of the 1G era included:{{cite web |archive-url=https://web.archive.org/web/20230715000000/https://media.crai.com/wp-content/uploads/2021/05/05145230/Insights-The-Economics-of-5G-article-6-Open-or-Closed-System-May2021.pdf |archive-date=15 July 2023 |access-date=13 October 2025

Advanced Mobile Phone System (AMPS) – United States and other regions{{cite web |archive-url=https://web.archive.org/web/20080417135000/http://www.amta.org.au/default.asp?Page=142 |archive-date=17 April 2008 |access-date=13 October 2025
Nordic Mobile Telephone (NMT) – Nordic countries and parts of Eastern Europe
Total Access Communication System (TACS) – United Kingdom and other regions
C-450 – West Germany, Portugal, and South Africa
Radiocom 2000 – France, operated by France Télécom
RTMI – Italy
MCS-L1 and MCS-L2 – Japan, developed by NTT
JTACS – Japan, variant of TACS operated by DDI

Transition to 2G

By the early 1990s, analog 1G systems were replaced by digital GSM and cdmaOne networks, which offered higher capacity, encryption, and text messaging. Most 1G networks were decommissioned by the early 2000s, though some persisted longer in remote or developing regions. The last known operational 1G service, in Russia, closed in 2017.

References

Info: Wikipedia Source

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mobile-telecommunications wireless-communication-systems

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