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

Recently developed mobile broadband wireless systems can provide high-quality multimedia services with required levels of QoS. Currently most 4^th 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.