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Most of today's IP traffic consists of the transfer of digital documents (Web pages, files,...) by flows of packets under the control of TCP. Such flows are usually referred to as elastic, since the bandwidth attributed to a given flow varies according to the level of congestion in the network. In this context, it is of fundamental interest to understand how the bandwidth is shared among the flows that compete for the same resource(s) in the network. Using simple models of the network dynamics at the packet level, we derive the bandwidth sharing realized by classical mechanisms such as window-based or rate-based congestion control at the flow level. The impact of scheduling and buffer management is also considered.
This is a joint work with L. Massoulié (Microsoft Research) and J. Roberts (France Telecom R&D).
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