Fixed collision rate back-off scheme for collision resolution in wireless networks |
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Authors: | Chih-Peng Yung-Fang |
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Affiliation: | aInstitute of Communications Engineering, National Sun Yat-Sen University, Kaohsiung, Taiwan;bDepartment of Communication Engineering, National Central University, Taoyuan, Taiwan |
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Abstract: | This investigation proposes a fixed collision rate (FCR) back-off algorithm for wireless networks. The proposed scheme takes advantage of the central unit (CU) in a wireless network to broadcast a common back-off window size to all the users, significantly alleviating the unfairness of bandwidth utilization in conventional binary exponential back-off (BEB) algorithms. It is shown that, when maximum throughput is achieved, collision rate is almost a constant for any traffic load. In the operation of the FCR, the CU dynamically adjusts the back-off window size to keep the collision rate at a constant level for maximum throughput. Simulation results demonstrate that the unfairness of bandwidth utilization in the BEB is significantly lessened and the throughput can be maintained at e-1≈0.368 when the number of users approaches infinity. The capture effect even further improves system performance. |
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Keywords: | Binary exponential back-off Collision resolution Medium access control (MAC) Bandwidth utilization Capture effect |
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