A dynamic bandwidth management scheme for wireless multimedia systems

With the advent of wireless and mobile networks and the growing number of mobile users using the system, multimedia services are expected to dominate the design of the next generation of wireless systems. Our motivation in this paper is to develop a scheme that would support a large number of users as well as their demands, while eliminating to a large extent the side effects of the inherent protocols used in our scheme. We propose a novel hybrid medium access control (MAC) scheme, based on the theoretical ´near-perfect´ CDMA using W-CDMA/SSFH/OFDM and an SDM component to support sector-based multimedia services. We also present a scheduling mechanism to support the hybrid algorithm. In order to increase the number of users that can be supported by the system and thereby reducing the call-blocking factor as much as possible, we have made use of the dynamic packet assignment algorithm. In this paper, we present our hybrid MAC protocol, its implementation and the simulation experiments we have carried out to evaluate its performance.