Phase transition in a directed traffic flow network

Details Phase transition in a directed traffic flow network Phase transition in a directed traffic flow network

2005-01-05

arxiv.org/abs/cond-mat/0501067v1

Phys. Rev. E 71, 066108 (2005)

Physics

Condensed Matter

Statistical Mechanics

Six pages, seven figures

Scientific paper

10.1103/PhysRevE.71.066108

The generic feature of traffic in a network of flowing electronic data packets is a phase transition from a stationary free-flow phase to a continuously growing congested non-stationary phase. In the most simple network of directed oriented square lattice we have been able to observe all crucial features of such flow systems having non-trivial critical behavior near the critical point of transition. The network here is in the shape of a square lattice and data packets are randomly posted with a rate $\rho$ at one side of the lattice. Each packet executes a directed diffusive motion towards the opposite boundary where it is delivered. Packets accumulated at a particular node form a queue and a maximum of $m$ such packets randomly jump out of this node at every time step to its neighbors on a first-in-first-out (FIFO) basis. The phase transition occurs at $\rho_c=m$. The distribution of travel times through the system is found to have a log-normal behavior and the power-spectrum of the load time-series shows $1/f$ like noise similar to the scenario of Internet traffic.

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