An effective medium contention method to improve the performance of IEEE 802.11 |
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Authors: | Wen-Tzu Chen |
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Affiliation: | (1) Institute of Telecommunications Management, National Cheng Kung University, No. 1 University Road, Tainan City, Taiwan |
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Abstract: | In this paper, we propose an effective medium access mechanism to enhance performance of the IEEE 802.11 distributed coordination
function (DCF). One of the primary issues of 802.11 is a contention-based medium access control (MAC) mechanism over a limited
medium, which is shared by many mobile users. In the original 802.11 DCF, the binary exponential backoff algorithm with specific
contention window size is employed to coordinate the competition for shared channel. Instead of binary exponential increase,
we adopt linear increase for the contention window that is determined according to the competing number of nodes. We also
assume that the access point can broadcast the number of mobile nodes to each station through management frames. An analytical
model is developed for the throughput performance of the wireless medium. Using simulation results from the NS2 simulator,
we show that our model can accurately predict the system saturation throughput, and can obtain better performance in terms
of throughput, fairness, and packet drop. |
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Keywords: | Medium access control Wireless channel Backoff algorithm Contention window |
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