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Mobile Information Systems
Volume 2015, Article ID 308194, 11 pages
http://dx.doi.org/10.1155/2015/308194
Research Article

Resilient Disaster Network Based on Software Defined Cognitive Wireless Network Technology

1Iwate Prefectural University, 152-52 Takizawa, Iwate 0200173, Japan
2Saitama Institute of Technology, Fukaya, Saitama Prefecture 369-0203, Japan

Received 1 September 2014; Accepted 1 September 2014

Academic Editor: Ilsun You

Copyright © 2015 Goshi Sato et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

In order to temporally recover the information network infrastructure in disaster areas from the Great East Japan Earthquake in 2011, various wireless network technologies such as satellite IP network, 3G, and Wi-Fi were effectively used. However, since those wireless networks are individually introduced and installed but not totally integrated, some of networks were congested due to the sudden network traffic generation and unbalanced traffic distribution, and eventually the total network could not effectively function. In this paper, we propose a disaster resilient network which integrates various wireless networks into a cognitive wireless network that users can use as an access network to the Internet at the serious disaster occurrence. We designed and developed the disaster resilient network based on software defined network (SDN) technology to automatically select the best network link and route among the possible access networks to the Internet by periodically monitoring their network states and evaluate those using extended AHP method. In order to verify the usefulness of our proposed system, a prototype system is constructed and its performance is evaluated.