Prepared by,
Ishit Patni,
Deep Gandhi

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3G & 4G Technologies & their Evolution
The nomenclature of the generations generally refers to a change in the fundamental nature of the service, non-backwards compatible transmission technology, and new frequency bands. New generations have appeared about every ten years since the first move from 1981 analog(1G) to digital(2G) transmission in 1992. Followed, by 3G multi-media support, spread spectrum transmission and at least 200 kbit/s, in 2011 expected to be followed by 4G, which refers to all-IP packed-switched networks, mobile ultra-broadband (gigabit speed) access and multi-carrier transmission.
3G or 3rd Generation, is a generation of standards for mobile phones and mobile telecommunications services fulfilling specifications by the International Telecommunication Union. Application services include wide-area wireless voice telephone, mobile internet access, video calls and mobile TV, all in a mobile environment. A 3G system must allow simultaneous use of speech and data services, and provide peak data rates of at least 200 kb/s. Recent 3G releases,also provide mobile broadband access of several Mb/s to laptop computers and smartphones.
The 3G research and development projects started in 1992. In December 2007, 190 3G networks were operating in 40 countries
4G stands for the fourth generation of cellular wireless standards. It is a successor to 3G and 2G families of standards. Speed requirements for 4G service set the peak download speed at 100 Mbit/s for high mobility communication and 1 Gb/s for low mobility communication.
4G offers download & upload speed up to 1Gb/s & 500Mb/s respectively. A data rate of at least 100 Mb/s between any two points in the world. 4G speeds up to 50 times higher than of 3G.