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Báo cáo hóa học: " Research Article Weighted Window and Class-Based Weighted Window Methods for Per-Station TCP Fairness in IEEE 802.11 WLANs"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Weighted Window and Class-Based Weighted Window Methods for Per-Station TCP Fairness in IEEE 802.11 WLANs | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2010 Article ID 593497 10 pages doi 10.1155 2010 593497 Research Article Weighted Window and Class-Based Weighted Window Methods for Per-Station TCP Fairness in IEEE 802.11 WLANs Mojtaba Seyedzadegan and Mohamed Othman Department of Communication Technology and Network Faculty of Computer Science and Information Technology Universiti Putra Malaysia 43400 UPM Serdang Selangor D.E Malaysia Correspondence should be addressed to Mojtaba Seyedzadegan ss.mojtaba@gmail.com Received 11 June 2010 Revised 27 September 2010 Accepted 28 October 2010 Academic Editor George Tombras Copyright 2010 M. Seyedzadegan and M. Othman. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. TCP unfairness problem in access networks using the 802.11 has been studied by many researchers. Their solutions required that the existing MAC protocol be modified. However since they did not consider the case when each wireless node has a different number of flows they cannot provide fairness among wireless nodes having different numbers of flow in both directions. In order to resolve this problem Weighted Window and Class-Based Weighted Window methods are proposed. In the Weighted Window method each wireless node can control the rate of TCP flows based on TCP window size. By applying this method per-station fairness can be achieved regardless of the number and direction of flows in each wireless node. Furthermore to improve and to provide fair bandwidth allocation in the Weighted Window method when the users have different requirements the ClassBased Weighted Window method is proposed. Therefore for wireless nodes with different requirements fair allocation bandwidth between wireless nodes in the same class of bandwidth is achieved. 1. Introduction The