**Modelling short TCP transfers**

**U. Ayesta, K.E. Avrachenkov, E. Altman, C. Barakat,
and P. Dube**

**Abstract:**

We model short TCP transfers sharing a single bottleneck link. Our model
consists of three parts. In the first part of the model we use the fixed
point approach to calculate the packet loss probability in the bottleneck
link. In the second part, using the fluid model approach and conditioning
on the number of loss instants, we calculate the average transfer time of
the TCP flows as a function of the packet loss probability and the parameters
of the TCP protocol. Finally, in the third part we apply the M/G/inf
model to obtain the distribution of the number of active sessions.
All analytical results are confirmed by NS simulations.