Utility-based adaptivity and partial resource reservation in wireless/mobile multimedia networks

Recently there is a growing interest in the adaptive multimedia networking where the bandwidth of an ongoing multimedia flow can be dynamically adjusted. In this paper the attention is focused on the management of independent and dependent from mobility services. Two classes of services have been considered: MIP and MDP classes defined in Integrated Services for mobile wireless environment. These two classes have been managed in a wireless adaptive networks. A utility-based rate adaptation algorithm has been considered and an admission control has been proposed. Rate adaptation and admission control consider the.,channel conditions through a slow fading channel model for Wireless LAN 802.11b. The admission control can use the pre-reservation phase among the cells potentially visited from mobile hosts for MIP services and consider only the bandwidth availability on current cells for MDP services. A new way for estimating the cells visited by MIP services has been proposed and analyzed. The performance evaluations of the wireless system have been evaluated in terms of total bandwidth utilization for MIP and MDP services, average bandwidth assigned to mobile users, system outage probability and admitted flows.