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Generations of Mobile Communications Networks

About this communication paper-presentations : (Generations of Mobile Communications Networks)
In France, in 1956, a very basic mobile telephony network was implemented with vacuum electronic tubes and electron-mechanical logic circuitry. These devices used for wireless communications had to be carried in car boots. In these early days of mobile telephony,
service access was far from being ubiquitous and was reserved for a very limited portion of the population. Since the introduction of this experimental network, mobile communications technologies benefited from major breakthroughs commonly categorized in three generations. In the 1980s, first generation (1G) mobile systems arrived in Nordic countries. These first generation systems were characterized by analog wireless communications and limited support for user mobility.

Digital communications technology was introduced with second generation (2G) mobile systems in the 1990s. Second generation systems are characterized by the provision of better
quality voice services available to the mass market. Second generation systems benefited from the cellular concept in which scarce radio resources are used simultaneously by several
mobile users without interference. The best known 2G system is the Global System for Mobile Communication (GSM) with the billionth GSM user connected in the first quarter of 2004. Other major 2G systems include cdmaOne (based on CDMA technology), with users in the Americas and Asia, and Japanese Personal Data Cellular (PDC) with the
iMode technology for mobile Internet.

Early 2004, first third generation (3G) mobile systems have been deployed in several European countries. With 3G systems, various wireless technologies converge with Internet
technologies. Third generation services encompass a wide range of multimedia and costeffective services with support for worldwide user mobility. The migration to 3G systems isfacilitated by the introduction of intermediary evolved 2G systems, also known as 2.5G systems.

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