With technological advancement and social changes, a proliferation of access networks (e.g. 2G, 3G, WLAN, HIPERLAN, WiMax) with diverse data rates and quality-of-service (QoS) specifications have emerged. Cellular operators have invested heavily into their networks and are working hard to maintain (even expand) their market share by improving the services (such as increasing throughput and data rate). It is difficult to predict which of these technologies will ultimately come on the top, reinforcing the likelihood of their coexistence in the future.

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Abbas Jamalipour holds a PhD from Nagoya University, Japan. He is the author of the first book on wireless IP and two other books, and has co-authored seven books and over 190 technical papers, all in the field of mobile communications network. He is a Fellow of IEEE (for contributions to next generation networks for traffic control), a Fellow of Institute of Engineers Australia; an IEEE Distinguished Lecturer; the Editor-in-Chief of the IEEE Wireless Communications; and a Technical Editor of several scholarly