Evaluation of Cognitive Wireless Based Delay Tolerant Network for Disaster Information System in a Rural Area

摘要

It has been already one year and ten months since the East Japan Great Earthquake in 2011. Even now, there are still so many problems including political problems for the reconstruction from the earthquake, but some newly disaster related researches are also being carried out for the reconstruction of the damaged cities. DTN (Delay Tolerant Network) is supposed to be one of the effective methods to transmit even under poor network conditions. However, when DTN is applied to local areas such as Taro in Japan, DTN might not work effectively because there are fewer roads, cars, and pedestrians than in urban areas. Therefore, this paper deals with DTN with (CWN) Cognitive Wireless Network consists of multiple wireless interfaces as proposed by a Disaster Information Network System in order to set up in local areas. Then, considering the actual usage of DTN in local areas, the simulation is held according to the map of Taro in Japan, the severely damaged town in the East Japan Great Earthquake. The proposal methods are simulated by the Epidemic Routing and Spray and Wait Routing in comparison with single IEEE802.11b/g and amateur radio. Then, the results are discussed for the future studies of DTN usages for Disaster Information Network System in local areas.