Physics – Physics and Society
Scientific paper
2007-11-11
New Journal of Physics 10 (2008) 023025
Physics
Physics and Society
6 pages and 6 figures, all comments are welcome
Scientific paper
10.1088/1367-2630/10/2/023025
We study the information traffic in Barab\'asi-Albert scale free networks wherein each node has finite queue length to store the packets. It is found that in the case of shortest path routing strategy the networks undergo a first order phase transition i.e., from a free flow state to full congestion sate, with the increasing of the packet generation rate. We also incorporate random effect (namely random selection of a neighbor to deliver packets) as well as a control method (namely the packet-dropping strategy of the congested nodes after some delay time $T$) into the routing protocol to test the traffic capacity of the heterogeneous networks. It is shown that there exists optimal value of $T$ for the networks to achieve the best handling ability, and the presence of appropriate random effect also attributes to the performance of the networks.
Wang Wen-Xu
Wu Zhi-Xi
Yeung Kai-Hau
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