3rd generation abbreviated as 3G the technology of IMT 2000. Where the 2nd generation based on GSM and as per the 1st Generation that was analogous.
History has been evolved from 1980 to 2010 with new technologies and upgardes are coming in the market and very high speed devices are invented in the multimedia as day passes.
Shown is the basic hirearichal structure
Refer for more details : http://wifisphare.com/3g.asp
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