Abstract
When a disaster hits a wide area, communication services for public use will be rendered unavailable. This will make it difficult to confirm the safety of people in the disaster area. A solution to this problem is to form delay/disruption tolerant networks (DTN) using mobile terminals of victims, those of rescuers, who serve as information carriers, and terminals (servers) in shelters. In this paper, we propose using a receiver-triggered handshake protocol for communication between these terminals. We have developed the bundle layer protocol for this handshake method. The proposed method has been implemented on a network simulator to build an evaluation environment. The disaster area has been modeled on an area around Shinjuku Station in Tokyo. Victims are randomly distributed in the area. We have compared the proposed method with Epidemic Routing and Spray and Wait in terms of the delivery rate at which messages reach their destinations, and the length of time taken for messages to reach their destinations. We have found that the delivery rate of the three methods are, more or less, the same, but that the proposed method is superior to the other two methods in terms of storage usage and battery consumption of terminals, and the number of bundles generated in the network.
Highlights
In recent years, there is a growing concern in society about the possibilities of earthquakes whose epicenters are directly below a major city
We have found that the delivery rate of the three methods are, more or less, the same, but that the proposed method is superior to the other two methods in terms of storage usage and battery consumption of terminals, and the number of bundles generated in the network
As a means of sending information about the safety of victims in a disaster, this paper has proposed delay/disruption tolerant networks (DTN) that uses a receiver-triggered handshake method, and has presented the detailed protocol of this method
Summary
There is a growing concern in society about the possibilities of earthquakes whose epicenters are directly below a major city. In the event of such a disaster, mobile terminals can be an effective means of communication but mobile communication networks are likely to be damaged. In the aftermath of the Great East Japan Earthquake, base stations were destroyed or damaged, and it took about one month before they were fully restored [1,2]. A type of network that is being studied to secure a communication infrastructure in the event of a disaster is a delay/disruption tolerant networks (DTN) [3]. Based on near-field communication and store-and-carry data transfer, the DTN makes data transfer possible, even in inferior communication conditions, such as frequent disruptions or disconnections of communications and large transmission delays. Representative protocols used in DTN are Epidemic Routing and Spray and Wait.
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