A novel energy-aware priority transmission scheme based on context-metric queuing for delay tolerant networks

Context information utilization for routing in Delay Tolerant Networks (DTN) has received great research attention in recent years. Context information is inherent and dynamic in mobile nodes and its application improves message delivery in DTN. This paper presents a context-metric queuing method, called CEAMS for DTN that aims to optimize the delivery of message with HIGH priority by exploiting time-variant context information of a node in the network. Our approach introduces a Node Delivery Capability (NDC) metric using node´s remaining energy, estimated distance to the destination and speed as metric in queuing and sorting messages in a buffer. We also design and implement the use of an energy-aware message priority transmission scheme with the proposed buffering model with admission and transmission control unit components. Our experimental results show the increase in delivery rate of HIGH priority messages and decrease in message redundancy compare to other DTN routing protocols using other queuing schemes.