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The evolution of an integrated mobile communication environment enables service deployment and content delivery offered by independent providers through heterogeneous network infrastructures. In a few months, a mobile user will be able to access value added services through several wireless public access networks (i.e., 3G cellular, Wireless LAN or WAN) belonging to the same or different operators and simultaneously use multiple different services at the same time. In this scenario there is a strong need for a common charging and billing scheme enhancing access flexibility and encouraging services and network convergence.
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