A large scale robust disaster information system based on never die network

In the actual disaster case, there is certain possibility that electric power line is damaged and power energy cannot be supplied to those communication network devices, eventually those wireless LANs cannot be functioned. Although mobile wireless network is easy to reconstruct than wired network, there may be the case that network disconnection is not affordable after disaster. That is, Disaster Information System needs a robust Never Die Network (NDN) which will be unaffected by any changes in environment after severe disaster. However, if the network is consisted with Satellite System, there are the problems of network throughput is low, cost is high and so on. In case of wireless LANs, there are the problems of physical characteristics and so on. In this paper, we introduce nobel functions for Never Die Network which consisted of Satellite System and Cognitive Wireless Network.