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Mobile WiMAX, based on IEEE 802.16e provides five different service classes: UGS, ertPS, rtPS, nrtPS and BE, to deliver the best quality experiences for mobile WiMAX users. Each service class is incorporated with several Quality of Service (QoS) mechanisms at the Media Access Control (MAC) layer to support the various applications. To ensure that the QoS of each class is provisioned, the uplink scheduler needs to allocate the available resources effectively to meet with the QoS parameters such as the delay, delay jitter and throughput requirements. In this paper, the authors propose a threshold-based priority algorithm to improve on the delay jitter of the UGS and rtPS classes.
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