Mobility

Contention Window Optimization: An Enhancement to IEEE 802.11 DCF to Improve Quality of Service

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Executive Summary

Wireless communication technology has gained widespread acceptance in recent years. Wireless Local Area Networks (WLANs) are becoming more and more popular and widely used, since they provide high data rates. The main characteristics of this technology are simplicity, flexibility and cost effectiveness. Recent applications include media streaming, interactive collaboration, videoconferencing and multimedia messaging. However, multimedia applications require a certain Quality of Service (QoS) support such as guaranteed bandwidth, reduced delay, high throughput and error rate. Guaranteeing those QoS requirements in the existing WLANs characterized by mobile stations with a low bandwidth and high rate error is a challenging task.

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