Mobility

Ensuring QOS in WiMAX Networks

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Executive Summary

Quality of Service (QoS) is a key metric for bandwidth demanding applications in WiMAX (IEEE 802.16 standard) networks. It is achieved through bandwidth reservation for each application. Existing solution use priority-based scheduling algorithm to ensure the QoS guaranteed services. Although, it allows the Subscriber Station (SS) to adjust the reserved bandwidth via bandwidth requests in each frame, it cannot avoid the risk of failing to satisfy the QoS requirements. So earlier bandwidth recycling was developed to recycle the unused bandwidth, once it occurs. Besides the naive priority-based scheduling algorithm, it uses three additional algorithms to improve the recycling effectiveness and thereby ensuring QOS. These various scheduling algorithms have brought some issues in terms of implementation complexity.

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