A New DTN Routing Strategy Considering Age of Information

Recently, DTN (Delay/Disruption Tolerant Networking) is getting much attentions as a communication architecture at a disaster affected area. Immediately after a disaster, countermeasure office must collect fresh disaster information for reducing disaster damages. This paper discusses how to improve freshness of disaster information. Then, we propose new method considering AoI (Age of Information). Mainly, our method employs two mechanisms: relay buffer management based on message originator, and changing order of message transmissions according to the message priority. By the results of simulation, we confirm that our proposal effectively shorten the AoI by comparison with the traditional DTN relay methods. In addition, this paper also discusses the situations that the network contains multiple senders having same priority. In order to cope with the situations, this paper also proposes to decide the transmission order according to a message creation time.