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Proceedings Paper

Guidelines for optimizing multilevel ECN using fluid-flow-based TCP model
Author(s): Pierre-Francois Quet; Sriram Chellappan; Arjan Durresi; Mukundan Sridharan; Hitay Ozbay; Raj Jain
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Paper Abstract

Congestion avoidance on today's Internet is mainly provided by the combination of the TCP protocol and Active Queue Management (AQM) schemes such as the de facto standard RED (Random Early Detection). When used with ECN (Explicit Congestion Notification), these algorithms can be modeled as a feedback control system in which the feedback information is carried on a single bit. A modification of this scheme called MECN was proposed, where the marking information is carried using 2 bits. MECN conveys more accurate feedback about the network congestion to the source than the current 1-bit ECN. The TCP source reaction was modified so that it takes advantage of the extra information about congestion and adapts faster to the changing congestion scenario leading to a smoother decrease in the sending rates of the sources upon congestion detection and consequently resulting in an increase in the router's throughput. A linearized fluid flow model already developed for ECN is extended to our case. Using control theoretic tools we justify the performance obtained in using the MECN scheme and give guidelines for optimizing its parameters. We use ns simulations to illustrate the performance improvement from the point of better throughput and low level of oscillations in the queue.

Paper Details

Date Published: 1 July 2002
PDF: 10 pages
Proc. SPIE 4866, Quality of Service over Next-Generation Internet, (1 July 2002); doi: 10.1117/12.473012
Show Author Affiliations
Pierre-Francois Quet, The Ohio State Univ. (United States)
Sriram Chellappan, The Ohio State Univ. (United States)
Arjan Durresi, The Ohio State Univ. (United States)
Mukundan Sridharan, The Ohio State Univ. (United States)
Hitay Ozbay, The Ohio State Univ. (United States)
Raj Jain, Nayna Networks, Inc. (United States)


Published in SPIE Proceedings Vol. 4866:
Quality of Service over Next-Generation Internet
Mohammed Atiquzzaman; Mahbub Hassan, Editor(s)

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