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On the behavior of ECN/RED gateways under a large number of TCP flows: Limit theorems
Makowski, Armand M.
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We consider a stochastic model of an ECN/RED gateway with competing TCP sources sharing the capacity. As the number of competing flows becomes large, the asymptotic queue behavior at the gateway can be described by a simple recursion and the hroughput behavior of individual TCP flows becomes asymptotically independent. In addition, a Central Limit Theorem complement is presented, yielding a more accurate characterization of the asymptotic queue. These results suggest a scalable yet accurate model of the complex large-scale stochastic feedback system, and crisply reveal the sources of queue fluctuations.