Short Survey: A survey of TCP-friendly router-based AQM schemes

Authors:
Gwyn Chatranon;Miguel A. Labrador;Sujata Banerjee
Affiliations:
Department of Information Science and Telecommunications, University of Pittsburgh, Pittsburgh, PA 15260, USA;Department of Computer Science and Engineering, University of South Florida, Tampa, FL 33620, USA;Hewlett-Packard Laboratories, Palo Alto, CA 94304, USA
Venue:
Computer Communications
Year:
2004

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Abstract

Although the majority of the traffic over the Internet is still TCP-based, applications such as voice over IP and video-conferencing are changing this very rapidly. While TCP-based applications react to network congestion, UDP-based streaming applications usually do not have any type of flow and congestion control mechanisms. UDP, the transport layer protocol used by audio and video streaming applications, does not react to network congestion thus stealing bandwidth from the responsive TCP-based connections. Several solutions have been suggested to combat this TCP-friendliness problem, mostly applied either in the end systems (end-to-end) at the transport layer of the protocol stack or inside the network (routers) at the network layer. This article surveys the state-of-the-art in router-based mechanisms to address the TCP-friendliness problem and presents a description of the most important algorithms, design issues, advantages and disadvantages, and a performance evaluation. The article also describes ways to estimate the number of active flows traversing a core router and points to further sources on this subject, which is widely used by many mechanisms, including several described in this survey.