Simulation study of new TCP variants

Using simulations, we analyze the performance of new TCP variants currently used in the Internet and that gradually replacing TCP NewReno, as they are already activated by default in operating systems or network equipment. We compare these new variants using some metrics that have been recently standardized in order to evaluate new congestion control mechanisms. We observe a trade-off between more aggressive variants that have good performances but a bad impact on the network state and the other flows, and fairer variants with lower performances.