Naslov
Global fairness of additive-increase and multiplicative-decrease with heterogeneous round-trip times

Autori
Vojnovic, Milan ; Le Boudec, Jean-Yves ; Boutremans, Catherine

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Proceedings of IEEE INFOCOM 2000 / - : Institute of Electrical and Electronics Engineers (IEEE), 2000, 1303-1312

Skup
IEEE INFOCOM 2000

Mjesto i datum
Tel Aviv, Izrael, 03.2000

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Additive-increase; Multiplicative-decrease; Fairness; Best-effort; TCP; TCP-friendly; TCP throughput-loss formula; RTT; Multiple-bottleneck; Stochastic approximation; ODE; Lyapunov

Sažetak
Consider a network with an arbitrary topology and arbitrary communication delays, in which congestion control is based on additive--increase and multiplicative--decrease. We show that the source rates tend to be distributed in order to maximize an objective function called $F_A^h$ (``$F_A^h$ fairness`). We derive this result under the assumption of rate proportional negative feedback and for the regime of rare negative feedback. This applies to TCP in moderately loaded networks, and to those TCP implementations that are designed to interpret multiple packet losses within one RTT as a single congestion indication and do not rely on re-transmission timeout. This result provides some insight into the distribution of rates, and hence of packet loss ratios, which can be expected in a given network with a number of competing TCP or TCP-friendly sources. We validate our findings by analyzing the parking lot scenario, and comparing with previous results \cite{floyd-91-b, mathis-97-a}, and an extensive numerical simulation with realistic parameter settings. We apply $F_A^h$ fairness to gain a more accurate understanding of the bias of TCP against long round trip times.

Izvorni jezik
Engleski

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