Adaptive threshold control for auto-rate fallback algorithm in IEEE 802.11 multi-rate WLANs |
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Authors: | Qilin Wu Yang Lu Xiaolin Zhu Fangzhen Ge |
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Affiliation: | 1. School of Computer &2. Information , Hefei University of Technology , Hefei 230009 , China;3. Department of Computer Science &4. Technology , Chaohu College , Chaohu 238000 , China linq.wu@gmail.com;6. Information , Hefei University of Technology , Hefei 230009 , China |
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Abstract: | The IEEE 802.11 standard supports multiple rates for data transmission in the physical layer. Nowadays, to improve network performance, a rate adaptation scheme called auto-rate fallback (ARF) is widely adopted in practice. However, ARF scheme suffers performance degradation in multiple contending nodes environments. In this article, we propose a novel rate adaptation scheme called ARF with adaptive threshold control. In multiple contending nodes environment, the proposed scheme can effectively mitigate the frame collision effect on rate adaptation decision by adaptively adjusting rate-up and rate-down threshold according to the current collision level. Simulation results show that the proposed scheme can achieve significantly higher throughput than the other existing rate adaptation schemes. Furthermore, the simulation results also demonstrate that the proposed scheme can effectively respond to the varying channel condition. |
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Keywords: | wireless local area networks IEEE 802 11 multi-rate rate adaptation auto-rate fallback |
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