A multiple time-scale model for TCP bandwidth sharing under user heterogeneity

Authors:
Dirk Abendroth;Hans van den Berg;Michel Mandjes
Affiliations:
Technical University Hamburg-Harburg, Hamburg, Germany;University of Twente, Enschede, The Netherlands;University of Twente, Enschede, The Netherlands
Venue:
NETWORKING'05 Proceedings of the 4th IFIP-TC6 international conference on Networking Technologies, Services, and Protocols; Performance of Computer and Communication Networks; Mobile and Wireless Communication Systems
Year:
2005

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Abstract

Building on the vast body of existing TCP models, we develop a novel versatile model that explicitly captures user heterogeneity, and takes into consideration dynamics at both the packet level and the flow level. It is described how the resulting multiple time-scale model can be numerically evaluated. Validation is done by using NS2 simulations as a benchmark. In extensive numerical experiments, we study the impact of heterogeneity in the round-trip times on user-level characteristics such as throughputs and flow transmission times, thus quantifying the resulting bias. In particular, we investigate to what extent this bias is affected by the networks' ‘packet-level parameters', such as buffer sizes. We conclude by extending the single-link model in a straightforward way to the general network setting.