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4G refers to the fourth generation of cellular wireless stan

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4G refers to the fourth generation of cellular wireless standards. It is a successor to 3G and 2G families of standards. A 4G system is expected to provide a comprehensive and secure all-IP based solution where facilities such as ultra-broadband (giga-bit speed) Internet access, IP telephony, gaming services, and streamed multimedia may be provided to users.

Pre-4G technologies such as mobile WiMAX and first-release 3G Long term evolution (LTE) have been available on the market since 2006[1] and 2009[2][3][4] respectively, and are often branded as 4G. Current versions of these technologies do however not fulfill the ITU-R requirements on 4G systems, stating data rates approximately up to 1 Gbit/s.

In all suggestions for 4G, the CDMA spread spectrum radio technology used in 3G systems and IS-95 is abandoned and replaced by frequency-domain equalization schemes, for example multi-carrier transmission such as OFDMA. This is combined with MIMO (Multiple In Multiple Out) i.e., multiple antennas, dynamic channel allocation and channel-dependent scheduling.

4G features

The 4G system was originally envisioned by the Defense Advanced Research Projects Agency (DARPA). The DARPA selected the distributed architecture, end-to-end Internet protocol (IP), and believed at an early stage in peer-to-peer networking in which every mobile device would be both a transceiver and a router for other devices in the network eliminating the spoke-and-hub weakness of 2G and 3G cellular systems.

4G systems not only provide telecommunications services, but also data and multimedia services. Not only does 4G provide the aforementioned, it allows mobility, thus one can take their Internet connection on the road and never have to worry about finding a hotspot.

Some candidate systems suggest having an open Internet platform

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