4G
In telecommunications, 4G is the fourth generation of mobile phone mobile communication technology standards. It is a successor to the third generation (3G) standards. A 4G system provides mobile ultra-broadband Internet access, for example to laptops with USB wireless modems, to smartphones, and to other mobile devices. Conceivable applications include amended mobile web access, IP telephony, gaming services, high-definition mobile TV, video conferencing, 3D television, and cloud computing.
Two 4G candidate systems are commercially deployed: the Mobile WiMAX standard (first used in South Korea in 2006), and the first-release Long Term Evolution
(LTE) standard (in Oslo, Norway and Stockholm, Sweden since 2009). It
has however been debated if these first-release versions should be
considered to be 4G or not, as discussed in the technical definition section below.
In the United States, Sprint (previously Clearwire) has deployed Mobile WiMAX networks since 2008, and MetroPCS
was the first operator to offer LTE service in 2010. USB wireless
modems have been available since the start, while WiMAX smartphones have
been available since 2010, and LTE smartphones since 2011. Equipment
made for different continents is not always compatible, because of
different frequency bands. Mobile WiMAX is currently (April 2012) not
available for the European market.
You can download 4G seminar abstract from here
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