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The advent of multimedia applications with high bandwidth and quality of service requirements has initiated a new era in telecommunications technology. At the same time, rapid development of various wireless and wired networks including third generation cellular mobile networks (UMTS and cdma 2000), ADSL, Wi-Fi, WiMax, terrestrial and satellite DVB networks have emerged the next research topic toward integration and convergence of those networks. The convergence of mobile and fixed networks will provide new business models for the communications systems and generate new applications. The seamless movement of a user subscribed to one network to another network using a unique multimode handheld device will therefore create new problems to be solved by the telecommunications researchers. Billing and security, maintaining the quality of service while moving from the home network to a visiting network and fast and lossless handoff among networks are some of those topics.