Multi-services supporting weighted power scheduling algorithm based on LWDF

Abstract

The increasing demand on multi-media services with very different QoS requirements and the employment of new wireless network protocols like 802.11 and 802.16, underscore the need for a network capable of supporting multi-services. Based on the LWDF (Largest Weighted Delay First) algorithm, DS-LWDF (Differentiated Service-LWDF) algorithm is proposed to realize the scheduling among RT (Real Time) and NRT (Non-Real Time) services. Moreover, according to the receive power of ACK frames, WP-LWDF (Weighted Power-LWDF) algorithm is proposed using a weighted differentiated-service function based on DS-LWDF algorithm. The simulation results in QualNet show that both DS-LWDF algorithm and WP-LWDF algorithm guarantee the throughput and fairness among NRT services while markedly reduce the delay of RT services. Furthermore, by introducing the weighted power, WP-LWDF algorithm optimizes the delay and throughput performance for RT services based on the DS-LWDF algorithm.