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Cellular mobile networks have evolved rapidly in the past few years. At a time when the industry is upgrading its second generation networks to 3G technology, the research community is looking into fourth generation networks and its challenges. Each generation of networks brings in a wealth of solutions, technologies and a number of new problems and research challenges. Third Generation (3G) mobile systems were designed to support high speed multimedia traffics including data and voice, while Fourth Generation (4G) networks will bring wireless systems to the All-IP Net-era. All-IP networks apply the IP technology end-to-end, from the mobile user to the gateway that connects it to the Internet. IPv6, the latest generation of the Internet Protocol, will be the glue that interconnects this heterogeneous world.
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