Inter-session network coding in delay-tolerant networks under Spray-and-Wait routing

The goal of this paper is to derive the performance analysis for a unicast session, under Spray-and-Wait routing and inter-session network coding, in the presence of background traffic in DTN with homogeneous mobility. General settings are considered for the distribution of the data rate between nodes, the buffer size, the number of sessions contending for network resources. Thanks to mean-field approximations, fluid models are derived to predict the dissemination of the packets pertaining to different flows, thereby presenting the first, to the best of the authors knowledge, study of performance in DTN with Spray-and-Wait under the presence of contention between several sessions. The accuracy of the model is assessed through simulations based on synthetic mobility traces.