Within the framework of a simple model, we are able to study
the overall performance of a given informational network,
depending on its uptaking as well as on the level of traffic control.
Simple enough to get analytical results, it shows a very rich
phenomenology, presenting continuous, discontinuous as well as hybrid
phase transitions between a free-flow phase and a congested phase,
critical points and different scaling behaviors in the system size.
We find that traffic control improves global performance, enlarging the
free-flow region in parameter space only in heterogeneous networks.
Traffic control introduces non-linear effects and, beyond a critical
strength, may trigger the appearance of a congested phase in a
discontinuous manner.
The model also reproduces the cross-over in the
scaling of traffic fluctuations empirically observed in the Internet.
Ref:PRE 79, 015101(R) (2009).
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