Abstract
In this paper some WiMAX MAC layer parameters will be optimized toimprove applications performance. The study is aimed to show, viasimulation, the effect of Automatic Repeat Request (ARQ) parameters onthe WiMAX performance. Also, it is aimed to verify the effectiveness ofUnsolicited Grant Service (UGS), Real Time Polling Service (rtPS), andEnhanced Real Time Polling Service (ertPS) in managing voice traffic andtheir effect on data traffic which use Best Effort (BE) service. The resultsshow that the video delay will be increased by from 5 ms to 24 ms whenenabling ARQ protocol on WiMAX network. It also give the optimumparameters for ARQ protocol to improve the WiMAX networkperformance. The research also shows that the best scheduling service forvoice is UGS; but it reduces the throughput for BE data.
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