부산대학교 도서관

With reference to the increasing data transfer such as video, music, large files on mobile devices e.g. Smartphones, ipads and electronic tablets, there has been corresponding increment in data traffic in the cellular network as the number of users keeps escalating day by day. In the meantime, mobile internet is rapidly evolving towards embedded internet, expanding its reach from people to machines [1]. In fact, the wireless industry now expects 50 billion machine-type devices connected to the global network by 2020. This has brought a huge burden on cellular network operators. The most economical ways are rerouting the data through complementary technologies such as the use of Wi-Fi, Femto, Heterogeneous, opportunistic networks and so on. It is also noted that each of these networks has its pros and cons. These assist network operators to choose one or more systems over the other. This paper considers the challenges of these offloading networks in Wi-Fi and Femto networks and their coexistence issues with each other and other networks.