3G or 3rd generation mobile telecommunications, is a making of standards for mobile phones and mobile telecommunications services satisfying the International Mobile Telecommunications-2000 (IMT — 2000) stipulation 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 situation. To meet the IMT-2000 standards, a system is necessary to provide peak data rates of at least 200 kbit/s. Recent 3G releases, often denoted 3.5G and 3.75G, also provide mobile broadband access of numerous Mbit/s to smartphones and mobile modems in laptop computers.
Detailed breakdown of 3G systems
The 3G (UMTS and CDMA2000) research and development projects started in 1992. In 1999, ITU accepted five radio interfaces for IMT-2000 as a part of the ITU-R M.1457 Recommendation; WiMAX was added in 2007.
There are evolutionary standards (EDGE and CDMA) that are backwards-compatible extensions to pre-existing 2G networks as well as radical standards that need all-new network hardware and frequency allocations. The cell phones used utilise UMTS in mixture with 2G GSM standards and bandwidths, but do not support EDGE. The latter group is the UMTS family, which consists of standards urbanized for IMT-2000, as well as the independently urbanized standards DECT and WiMAX, which were incorporated because they fit the IMT-2000 definition.
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