A versatile model for TCP bandwidth sharing in networks with heterogeneous users

D. Abendroth, Hans Leo van den Berg, M.R.H. Mandjes

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    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 single-link 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.
    Original languageUndefined
    Pages (from-to)267-278
    Number of pages12
    JournalAEÜ International journal of electronics and communications
    Issue numberA219/4
    Publication statusPublished - 2006


    • TCP
    • Throughput
    • EWI-9126
    • METIS-237926
    • IR-78461
    • Acyclic networks
    • Flow level
    • Round-trip times
    • User heterogeneity
    • Packet level
    • Performance

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