tailieunhanh - Báo cáo hóa học: " Research Article Rate-Based Active Queue Management for TCP Flows over Wired and Wireless "

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề Research Article Rate-Based Active Queue Management for TCP Flows over Wired and Wireless | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2007 Article ID 54038 8 pages doi 2007 54038 Research Article Rate-Based Active Queue Management for TCP Flows over Wired and Wireless Networks Jun Wang and Min Song Department of Electrical and Computer Engineering Old Dominion University 231 Kaufman Hall Norfolk VA 23529 USA Received 21 July 2006 Revised 18 November 2006 Accepted 22 November 2006 Recommended by Xiuzhen Cheng Current active queue management AQM and TCP protocol are designed and tuned to work well on wired networks where packet loss is mainly due to network congestion. In wireless networks however communication links suffer from significant transmission bit errors and handoff failures. As a result the performance of TCP flows is significantly degraded. To mitigate this problem we analyze existing AQM schemes and propose a rate-based exponential AQM REAQM scheme. The proposed REAQM scheme uses the input rate as a primary metric and queue length as the secondary metric. The objectives of REAQM are to stabilize networks with low packet loss low packet delay and high link utilization regardless the dynamic of network conditions. We prove the global asymptotic stability of the equilibrium based on Lyapunov theory. Simulation results suggest that REAQM is capable of performing well for TCP flows over both wired and wireless networks and has comparable implementation complexity as other AQM schemes. Copyright 2007 J. Wang and M. Song. 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. 1. INTRODUCTION The essence of network congestion control is that a sender adjusts its transmission rate according to the congestion measure of the underline networks. There are two components to accomplish this. One is a source algorithm that dynamically adjusts .

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