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Modelling and stability of FAST TCP

Wang, Jiantao and Wei, David X. and Choi, Joon-Young and Low, Steven H. (2007) Modelling and stability of FAST TCP. In: Wireless communications. IMA volumes in mathematics and its applications. No.143. Springer , New York, pp. 331-356. ISBN 0387372695.

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We discuss the modelling of FAST TCP and prove four stability results. Using the traditional continuous-time flow model, we prove, for general networks, that FAST TCP is globally asymptotically stable when there is no feedback delay and that it is locally asymptotically stable in the presence of feedback delay provided a local stability condition is satisfied. We present an experiment on an emulated network in which the local stability condition is violated. While the theory predicts instability, the experiment shows otherwise. We believe this is because the continuous-time model ignores the stabilizing effect of self-clocking. Using a discrete-time model that captures this effect, we show that FAST TCP is locally asymptotically stable for general networks if all flows have the same feedback delay, no matter how large the delay is. We also prove global asymptotic stability for a single bottleneck link in the absence of feedback delay. The techniques developed here are new and applicable to other protocols.

Item Type:Book Section
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Low, Steven H.0000-0001-6476-3048
Additional Information:© Springer 2007.
Subject Keywords:FAST TCP, Modelling, Stability
Series Name:IMA volumes in mathematics and its applications
Issue or Number:143
Classification Code:AMS(MOS) subject classifications. 68Ml0
Record Number:CaltechAUTHORS:20101029-153050412
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:20606
Deposited By: Ruth Sustaita
Deposited On:03 Dec 2010 00:07
Last Modified:09 Nov 2021 00:01

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