Mobile and wireless communications are moving toward a new era that will be characterized by the seamless collaboration of heterogeneous systems, the need for high speed communications while on the move, and for advanced services with quality guarantees. Recent market research studies show that mobile multimedia services will produce most of the traffic in the future wireless networks which are expected to proliferate by the year 2010. On the other hand, mobile and wireless communications technology is becoming more and more important in developing countries where people demand fast...