Information Sharing Scheme Using AoI for DTN-based Evacuation Systems and Its Evaluation

In recent years, Japan has frequently experienced natural disasters such as earthquakes and typhoons, necessitating the rapid and accurate acquisition of evacuation support information. However, during such disasters, communication infrastructure may be damaged, making information sharing difficult. To address this issue, Delay/Disruption Tolerant Networking (DTN) technology has garnered attention. In this study, we propose a new information sharing scheme for evacuation support systems using DTN, leveraging the Age of Information (AoI) to assess the freshness of information. The proposed scheme discards information that exceeds a certain AoI threshold, ensuring that evacuees can act based on the most recent and accurate information. This paper evaluates the effectiveness of the proposed scheme through simulations using real geographical information. Furthermore, we discuss the impact of the proposed scheme on evacuation time, the number of evacuees, and the average evacuation time.