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A Throughput Fairness Control Method for Concurrent Communications in Wireless Local-Area Network with Multiple Access-Points

Md. Mahbubur Rahman 1, Nobuo Funabiki 1, Kwenga Ismael Munene 1, Sujan Chandra Roy 1, Minoru Kuribayashi 1, and Wen-Chung Kao 2
1. Graduate School of Natural Science and Technology, Okayama University, Okayama, Japan
2. Department of Electrical Engineering, National Taiwan Normal University, Taipei, Taiwan

Abstract—The IEEE 802.11n wireless local-area network (WLAN) has been widely deployed at every place around the world for the Internet access services. In WLAN, the throughput unfairness problem appears among concurrently communicating hosts due to their signal strength differences when the distances to access-points (APs) are different. Previously, to achieve fair network services among users, we have studied the method of controlling the packet transmission delay at one AP using PI controller. However, it cannot be applied to multiple APs that are common in WLAN. In this paper, we propose a throughput fairness control method of applying traffic shaping at the APs to provide the fair throughput among concurrently communicating hosts with multiple APs. For evaluations, we implement the testbed system using Raspberry Pi for APs and conduct extensive experiments in six topologies with up to four APs. The results show that the throughput of every host is similar to each other in any topology, which confirms the effectiveness of the proposal.

Index Terms—WLAN, traffic shaping, throughput fairness, Raspberry Pi, PI controller

Cite: Md. Mahbubur Rahman, Nobuo Funabiki, Kwenga Ismael Munene, Sujan Chandra Roy, Minoru Kuribayashi, and Wen-Chung Kao, "A Throughput Fairness Control Method for Concurrent Communications in Wireless Local-Area Network with Multiple Access-Points," Journal of Communications vol. 17, no. 8, pp. 592-599, August 2022. Doi: 10.12720/jcm.17.8.592-599

Copyright © 2022 by the authors. This is an open access article distributed under the Creative Commons Attribution License (CC BY-NC-ND 4.0), which permits use, distribution and reproduction in any medium, provided that the article is properly cited, the use is non-commercial and no modifications or adaptations are made.