Journal of Parallel and Distributed Computing - Special issue on wireless and mobile computing and communications
Dynamic tuning of the IEEE 802.11 protocol to achieve a theoretical throughput limit
IEEE/ACM Transactions on Networking (TON)
Runtime Optimization of IEEE 802.11 Wireless LANs Performance
IEEE Transactions on Parallel and Distributed Systems
Distributed mechanisms for quality of service in wireless LANs
IEEE Wireless Communications
Performance analysis of the IEEE 802.11 distributed coordination function
IEEE Journal on Selected Areas in Communications
IEEE 802.11 protocol: design and performance evaluation of an adaptive backoff mechanism
IEEE Journal on Selected Areas in Communications
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The IEEE 802.11 distributed coordination function (DCF) provides a contention-based distribution channel access mechanism for stations to share the wireless medium. However, performance of the DCF drops dramatically due to high collision probability as the number of active stations becomes larger. In this paper, we propose a simple and effective collision resolution scheme for improving the performance of the DCF mechanism. Our idea is based on the estimation of the channel's contention level, by measuring duration of busy and idle periods observed on the channel at each station. In order to reduce collision probability, the proposed scheme limits the number of contending stations at the same time according to the channel contention level. Performance of the proposed scheme is investigated by numerical analysis and simulation. Our results show that the proposed scheme is very effective and improves the performance under a wide range of contention levels.