4G is the abbreviation for Fourth technology. It is also known as Beyond 3G.This term used to describe the next complete evolution in wireless communications. One of the terms used to describe 4G is MAGIC -Mobile multimedia, anytime anywhere, Global mobility support, integrated wireless solution, and customized personal service. A 4G system will be able to provide a comprehensive IP solution where voice, data and streamed multimedia can be given to users on an "Anytime, Anywhere" basis, and at higher data rates than previous generations. The approaching 4G (fourth generation) mobile communication systems are projected to solve still-remaining problems of 3G (third generation) systems and to provide a wide variety of new services, from high-quality voice to high- definition video to high-data-rate wireless channels. The term 4G is used broadly to include several types of broadband wireless access communication systems, not only cellular telephone systems. As a promise for the future, 4G systems, that is, cellular broadband wireless access systems have been attracting much interest in the mobile communication arena. The 4G systems not only will support the next generation of mobile service, but also will support the fixed wireless networks. With this feature, users will have access to different services, increased coverage, the convenience of a single device, decrease in total access cost, and more reliable wireless access even with the failure or loss of one or more networks. 4G networks will also feature IP interoperability for seamless mobile Internet access and bit rates of 50 Mbps or more.which is approximate 2Mbps in 3g technology. Researchers and vendors are expressing a growing interest in 4G wireless networks that support global roaming across multiple wireless and mobile networks—for example, from acellular network to a satellite-based network to a high-bandwidth wireless LAN.
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