title: Traffic congestion in interconnected complex networks.
abstract: Traffic congestion in isolated complex networks has been investigated extensively over the last decade. Coupled network models have recently been developed to facilitate further understanding of real complex systems. Analysis of traffic congestion in coupled complex networks, however, is still relatively unexplored. In this paper, we try to explore the effect of interconnections on traffic congestion in interconnected Barabási-Albert scale-free networks. We find that assortative coupling can alleviate traffic congestion more readily than disassortative and random coupling when the node processing capacity is allocated based on node usage probability. Furthermore, the optimal coupling probability can be found for assortative coupling. However, three types of coupling preferences achieve similar traffic performance if all nodes share the same processing capacity. We analyze interconnected Internet autonomous-system-level graphs of South Korea and Japan and obtain similar results. Some practical suggestions are presented to optimize such real-world interconnected networks accordingly.
authors.affiliation: Department of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China and Department of Electronic and Information Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong.
authors.forename: Fei
authors.initials: F
authors.lastname: Tan
authors.affiliation: Department of Electronic and Information Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong.
authors.forename: Jiajing
authors.initials: J
authors.lastname: Wu
authors.affiliation: Department of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, People's Republic of China.
authors.forename: Yongxiang
authors.initials: Y
authors.lastname: Xia
authors.affiliation: Department of Electronic and Information Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong.
authors.forename: Chi K
authors.initials: CK
authors.lastname: Tse
mesh_terms: D003198:Computer Simulation; D016247:Information Storage and Retrieval / Q000706:statistics & numerical data*; D020407:Internet / Q000706:statistics & numerical data*; D015233:Models, Statistical