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FI-RED: AQM mechanism for improving fairness among TCP connections in tandem networks

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3 Author(s)
Ohsaki, H. ; Dept. of Inf. Networking, Osaka Univ. ; Eguchi, T. ; Murata, M.

In this paper, we focus on a tandem network, and design an AQM mechanism called FI-RED (fairness improvement for RED) for improving the fairness among heterogeneous TCP connections. In FI-RED, ECN (explicit congestion notification) mechanism is used for differentiating the packet marking probability of RED according to the CE (congestion experienced) bit of arriving packets. Namely, FI-RED suppresses congestion indication to TCP connections with a large number of hops (i.e., connections with a high probability that the CE bit is marked). With such a simple modification to the original RED, a TCP connection with a large number of hops suffers almost the same packet marking probability as one with a small number of hops. Therefore, it is expected that FI-RED improves fairness among TCP connections with different numbers of hops; i.e., bias against the number of hops. We analyze the steady state behavior of FI-RED and perform simulation experiments in several network configurations. We quantitatively show that the fairness among TCP connections is significantly improved compared with RED

Published in:

Applications and the Internet, 2006. SAINT 2006. International Symposium on

Date of Conference:

23-27 Jan. 2006