Priority-aware extended eOCSA frame packing algorithm evaluation in WiMAX systems with mixed VoIP and data traffic

Abstract

Recently developed mobile broadband wireless systems can provide high-quality multimedia services with required levels of QoS. Currently most 4th generation wireless communication systems employ the Orthogonal Frequency Division Multiple Access (OFDMA) technology in the downlink (DL) part of their physical layer. In this paper we present a simulation-based performance analysis of the Priority-Aware Extended eOCSA (PA-EeOCSA) DL frame packing algorithm under mixed VoIP and uncorrelated data traffic. For VoIP traffic, the ON-SID model has been used and the packing efficiency of both the eOCSA and PA-EeOCSA algorithms have been compared. Simulation results point out that in terms of mean percentage of unallocated bursts and the number of slots allocated on average, the PA-EeOCSA algorithm performs more efficiently in comparison to eOCSA. Results also show that with data users fixed at 20, between 40-45 VoIP users can be admitted if the mean percentage of unallocated bursts is to be maintained below 3.0 %. Recall that, a low mean percentage of unallocated bursts is imperative in order to keep the overall packet loss rate below a tolerable limit.