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A File Sharing Method Using a Delay Tolerant Network in Daily Life

In this study, we will develop an application called DTNFileShare, which uses the delay tolerance network (DTN) for file sharing. Mobile terminals such as smartphones have become widely used. Mobile terminals can connect to networks by using communication infrastructure such as base stations and access points. However, information exchange using mobile terminals becomes difficult when the communication infrastructure cannot be used due to disasters or other reasons. Therefore, delay tolerant network exist as a technology to cope with these situations such as during a disaster. If DTN can be used not only in times of disaster but also in everyday life, files can be exchanged without depending on the communication infrastructure. However, there are two issues that need to be addressed when using DTN in everyday life. The first issue is that the timing of sending and receiving messages is not known by receiver and sender, respectively. The second issue is difficult to share the Endpoint ID (EID), which is the unique ID of the DTN, with others. DTNFileShare solves these two issues by integrating with Slack, a communication tool. With the implementation of the proposed system, EID can be shared at the touch of a button on the Slack application. In addition, notifications are sent to the Slack account when files are sent or received. These features make it comfortable to share files using DTN not only in times of disaster, but also in everyday life.