Mobility independent and dependent predictive services management in wireless/mobile multimedia network

In this paper the attention is focused on the management of services independent and dependent from mobility in the adaptive multimedia networking, where the bandwidth of an ongoing multimedia flow can be dynamically adjusted. Two classes of services have been considered: MIP and MDP classes defined in Integrated Services for mobile wireless environment. In order to offer an adaptive QoS (soft QoS) increasing the total wireless system utilization, a rate adaptation algorithm has been considered. The valued algorithm is based on user utility function and its target is to maximize this function. The mobility of host can impact on number of handoff and on channel states (fading), so the rate adaptation accounts the degradation channel state conditions. An algorithm of admission control has been considered too in order to regulate the access to wireless multimedia network. The admission control can use the pre-reservation phase among potentially visited cells from mobile hosts for MIP services and consider only the bandwidth availability on current cells for MDP services. The performance evaluations of the wireless system have been evaluated in terms of total bandwidth utilization for MIP and MDP services, average user utility perceived by mobile users and system outage probability. © 2004 IEEE.