Performance Evaluation of PC Router Based Cognitive Wireless LANs for Disaster Information System

Disaster information network is very important for people in many countries, particularly in Japan because there are many serious disasters have occurred annually. So far we have developed a disaster information network based on wireless LANs because of their mobility, portability and easy installation. In order to improve the connectivity and to attain the longer communication distance, we introduce a dynamic network configuration based cognitive Radio LANs. Currently available wireless LANs such as IEEE802.11b,g,j,n, IEEE802.16, cellular network, personal wireless network are combined with a mobile router and loaded on a car to quickly build a emergency temporal disaster information network when the usual communication network infrastructure was seriously damaged. In this paper, we designed and implemented a wireless mobile network using currently available different wireless network and pc based routers. Its network architecture and network protocol are specified to realize high performance connectivity and throughput. A simple prototype system is constructed to evaluate the functional and performance. As a result, we could verify the feasibility of effective and flexible disaster information network.