Abstract—In a wireless LAN, multimedia traffic is one of important traffic types. However, it is not easy to transmit multimedia traffic in a wireless LAN because it requires strict assurance for delay and loss. Although a multimedia packet is sent to a receiver without an error, it is discarded, if it does not satisfy its own delay bound. In a wireless LAN, a packet is transmitted with a FIFO (First-In First-Out) queue, i.e., a packet is transmitted in sequence regardless of delay bound of each packet. Therefore, traffic with long delay bound has good performance, though traffic with short delay bound shows poor performance. Accordingly, fairness problem between traffic with different delay bounds occur. To overcome the problem, we propose a transmission sequence adjustment scheme. The proposed scheme adjusts the transmission sequence of data packets in the queue by considering the delay bounds of all the data packets in the queue. Performance of the proposed scheme is investigated by simulation. Our results show that the proposed scheme is more effective and alleviates the fairness problem.
Index Terms—Delay bound, EDCA, fairness, transmission sequence.
Y. U. Kim is with the Department of Computer IT Engineering, Kumoh National Institute of Technology, Gumi, Korea (e-mail: power2000vx@naver.com).
S. Kim is with the Department of Computer Software Engineering, Kumoh National Institute of Technology, Gumi, Korea (e-mail: sunmyeng@kumoh.ac.kr).
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Cite:Young Ung Kim and Sunmyeng Kim, "Transmission Sequence Adjustment Scheme for Improving Fairness in Wireless LANs," Journal of Advances in Computer Networks vol. 2, no. 2, pp. 89-95, 2014.