Programming QoS in Mobile Multimedia Networks

This paper presents an open programmable middleware platform for mobile multimedia networking called mobiware. Built on advanced distributed object technology including active objects, proxies and agents, mobiware, dynamically exploits the intrinsic scalable properties of multimedia content by responding to time-varying wireless and mobile QOS conditions. At the core of mobiware lies a novel adaptive-QOS model that captures the adaptive nature of mobile multimedia applications in terms of utility functions and adaptation policies. Adaptive-QOS is realized by three middleware modules: an active transport environment, which operates at the end-systems and access points allowing mobile devices to access, manipulate and distribute multimedia content; an open programmable mobile multimedia network, which supports the rapid introduction of new mobile services with adaptive-QOS assurances over an indoor pico-cellular and ad-hoc network called mobinet; and nally a programmable medium access controller, which supports the wireless aspects of new mobile services that can respond to time-vary channel capacity and error characteristics. Collectively, these three middleware modules o er a foundation for programming QOS in mobile multimedia networks. On sabbatical leave from Politecnico di Milano, Dipartimento di Elettronica e Informazione, P.zza Leonardo da Vinci, 32, 20133 Milano, Italy, email: bianchi@elet.polimi.it

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