J.L. van den Berg
- A versatile model for TCP bandwidth sharing in networks with user heterogeneity.
- Book/source title
- Proceedings Korea-Netherlands Joint Conference on Queueing Theory and its Applications to Telecommunication Systems, , Seoul, South Korea.
- Pages (from-to)
- Amsterdam: Centrum voor Wiskunde en Informatica
- Document type
- Conference contribution
- Faculty of Science (FNWI)
- Korteweg-de Vries Institute for Mathematics (KdVI)
Enabled by the emergence of various access technologies (such as ADSL and wireless LAN),
the number of users with high-speed access to the Internet is growing rapidly, and their
expectation with respect to the quality-of-service of the applications has been increasing
accordingly. With TCP being the ubiquitous underlying end-to-end control, this motivates the
interest in easy-to-evaluate, yet accurate, performance models for a TCP-based network shared by multiple classes of users. Building on the vast body of existing 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. We also investigate to what extent this bias is affected by the networks' 'packet-level parameters', such as buffer sizes. We conclude by extending the singlelink model in a straightforward way to a general network setting. Also in this network setting the impact of heterogeneity in round-trip times is numerically assessed.
2000 Mathematics Subject Classification: 60K25, 68M20
Keywords and Phrases: TCP; user heterogeneity; performance; throughput; round-trip times; packet level; flow level; acyclic networks
Note: The work of H. van den Berg and M. Mandjes was partially funded by the Dutch Ministry of Economic Affairs (through its agency SENTER/NOVEM) under the programme `Technologische Samenwerking ICT Doorbraakprojecten', project TSIT 2031 EQUANET. M. Mandjes is also with Korteweg-de Vries Institute, University of Amsterdam, Amsterdam, the Netherlands, and EURANDOM, Eindhoven, the Netherlands.
D. Abendroth is currently with Bayerische Motor Werke, München, Germany.
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