A cross-layer design of wireless IP systems using effective bandwidth and MQAM adaptive modulation

Abstract

In this paper, we introduce an effective bandwidth-based call admission control (CAC) with adaptive modulation technique to manage the traffic in a wireless IP-based network. Furthermore, in order to efficiently use the physical resources of the network, we take advantage of an adaptive MQAM (M-ary quadrature amplitude modulation) to match transmission rates to the time-varying channel conditions. This cross-layer architecture has been examined for the self-similar traffic model. The results show that by simultaneous implementation of the effective bandwidth algorithm in the data-link layer and adaptive modulation technique in the physical layer, the performance of the wireless network in terms of the number of rejected calls and system throughput improves.