Evaluation of Never Die Network for a Rural Area in an Ultra Large Scale Disaster

About 80 percent of Japan is located in the mountain or coast sides, and so most cities should be concerned to be isolated when a ultra large disaster happens such as Japan Earthquake and Tsunami on March 11th, 2011. In fact, in the earthquake, there were many areas in the coast side of northern Japan where is isolated because of the damages, blackouts, and congestions of network information systems. In case of such a large-scale disaster, it is important to keep connectivity to avoid the isolation from other areas, and to reactivate network connections quickly within disaster areas such as between evacuation shelters and disaster headquarter. In this paper, Never Die Network consisted of cognitive wireless networks and satellite system that we have proposed is introduced, and the evaluations are held in assumptions of rural areas such as the coast cities of Iwate Prefecture where heavily disaster by Japan Earthquake and Tsunami on March 11th, 2011. The results shows that the proposed system is quickly recovered than other traditional network systems such as wired, wireless, and cognitive wireless network systems, and it is considered to be useful for the isolation by a ultra large scale disaster.