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Telecom operators and Internet service providers are heading for a new shift in communications paradigms. The forthcoming convergence of cellular and wireless data networks is often manifested in an "all IP approach" in which all communications are based on an end-to-end IP protocol framework. The approach to network design becomes user and service-centered, so that continuous reachability of mobile users and sustained communication capabilities are default requirements for a prospectivedoi:10.1109/mcom.2006.1668426 fatcat:cyu67cw4wzgtng55vjwanixseu