Diana, Rémi and Lochin, Emmanuel ECN verbose mode: a statistical method for network path congestion estimation. (2011) Computer Networks, vol. 55 (n° 10). pp. 2380-2391. ISSN 1389-1286
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Official URL: http://dx.doi.org/10.1016/j.comnet.2011.04.001
This article introduces a simple and effective methodology to determine the level of congestion in a network with an ECN-like marking scheme. The purpose of the ECN bit is to notify TCP sources of an imminent congestion in order to react before losses occur. However, ECN is a binary indicator which does not reflect the congestion level (i.e. the percentage of queued packets) of the bottleneck, thus preventing any adapted reaction. In this study, we use a counter in place of the traditional ECN marking scheme to assess the number of times a packet has crossed a congested router. Thanks to this simple counter, we drive a statistical analysis to accurately estimate the congestion level of each router on a network path. We detail in this paper an analytical method validated by simulations which demonstrate the feasibility and the accuracy of the concept proposed and illustrate its use in a realistic scenario. We conclude this paper with possible applications and expected future work.
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