Delay and Disruption Tolerant Networks (DTNs)
Recently there has been much research activity in the emerging area of Delay and Disruption Tolerant Networks (DTNs), mainly because they have the potential to connect devices and areas of the world that are under-served by current networks. DTNs are characterized by long or variable delay, intermittent connectivity, and high error rates; and overcome these problems by using store-and-forward message switching and persistent storage.
Messages are moved from a storage place on one node to a storage place on another node, along a path that eventually reaches the destination. A critical challenge in designing a protocol for efficiently and successfully delivering messages to their destinations is to determine, for each message, the best nodes and time to forward. In relation to this challenge, a new routing algorithm based on space-time graph model derived from the predictable behavior of nodes is currently being proposed. Hence, the transmission can be scheduled ahead of time increasing the success of message delivery and also decreasing the resource usage of the network. In addition, a prototype implementation of the Internet Research Task Force (IRTF) DTN architecture is being developed as an experimental platform where DTN protocols and DTN applications can be validated.
Selected Publications
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Oliveira, C. T., Taveira, D. M., Braga, R. B., and Duarte, O. C. M. B. - "Uma Proposta de Roteamento Probabilístico para Redes Tolerantes a Atrasos e Desconexões", in XXVI Simpósio Brasileiro de Redes de Computadores - SBRC'2008, pp. 735-748, Rio de Janeiro, RJ, Brazil, May 2008 (GTA-07-28).
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Oliveira, C. T., Moreira, M. D. D., Rubinstein, M. G., Costa, L. H. M. K., and Duarte, O. C. M. B. - "Redes Tolerantes a Atrasos e Desconexões", in Minicursos do Simpósio Brasileiro de Redes de Computadores - SBRC'2007, Belém, PA, Brazil (GTA-07-02).