Proxy-RED: an AQM scheme for wireless local area networks

Authors:
Sungwon Yi;Martin Kappes;Sachin Garg;Xidong Deng;George Kesidis;Chita R. Das
Affiliations:
Information Security Research Divison, Electronics and Telecommunications Research Institute, Korea;Department of Computer Science and Engineering, University of Applied Sciences, Germany;Department of Networking Systems Research, Avaya Labs Research, U.S.A.;Department of Electrical and Computer Engineering, St. Cloud State University, Minnesota, U.S.A.;Department of Computer Science and Engineering, The Pennsylvania State University, Pennsylvania, U.S.A.;Department of Computer Science and Engineering, The Pennsylvania State University, Pennsylvania, U.S.A.
Venue:
Wireless Communications & Mobile Computing
Year:
2008

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Abstract

Wireless access points (APs) act as bridges between wired and wireless networks. Since the actually available bandwidth in wireless networks is much smaller than the bandwidth in wired networks, there is a disparity in channel capacity which makes the access point a significant network congestion point in the downstream direction. A current architectural trend in wireless local area networks (WLAN) is to move functionality from APs to a centralized gateway in order to reduce cost and improve features. In this paper, we study the use of RED, a well known active queue management (AQM) scheme, and explicit congestion notification (ECN) to handle bandwidth disparity between the wired and the wireless interface of an access point. Then, we propose the Proxy-RED scheme, as a solution for reducing the AQM overhead from the access point. Simulations-based performance analysis indicates that the proposed Proxy-RED scheme improves the overall performance of a network. In particular, the Proxy-RED scheme significantly reduces packet loss rate and improves goodput for a small buffer, and minimizes delay for a large buffer size. Copyright © 2006 John Wiley & Sons, Ltd. A preliminary version of this paper was presented at IEEE ICCCN, October 2004.