DtnSim: Bridging the Gap Between Simulation and Implementation of Space-Terrestrial DTNs

International audienc

DtnSim: Bridging the Gap Between Simulation and Implementation of Space-Terrestrial DTNs

International audienc

Internetworking Approaches Towards Along-Track Segmented Satellite Architectures

International audienceThe Argentinian Space Agency (CONAE) has beenpursuing the development of segmented satellite architectures asa novel strategy to reduce the cost and improve responsivenessof space access. Among the key enablers for these architectures,wireless communication is likely to be the most critical as itrequires to operate on a highly dynamic, sparse and extremeenvironments. In this work, we analyze and derive the mainspecifications that a communication system for segmented architectures(CSSA) must support. In particular, we provide anabstract model to predict the access time to segmented systems tolater propose a layered arrangement of the main specificationsfor the CSSA. Finally, we analyze by simulation a particularCSSA configuration in a simple yet representative scenario withan along-track flight formation

A Segmented Architecture Approach to Provide a Continuous, Long-Term, Adaptive and Cost-effective Glaciers Monitoring System Based on DTN Communications and Cubesat Platforms

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Assessing Contact Graph Routing Performance and Reliability in Distributed Satellite Constellations

International audienceExisting Internet protocols assume persistent end-to-end connectivity, which cannot be guaranteed in disruptive and high-latency space environments. To operate over these challenging networks, a store-carry-and-forward communication architecture called Delay/Disruption Tolerant Networking (DTN) has been proposed. This work provides the first examination of the performance and robustness of Contact Graph Routing (CGR) algorithm, the state-of-the-art routing scheme for space-based DTNs. To this end, after a thorough description of CGR, two appealing satellite constellations are proposed and evaluated by means of simulations. Indeed, the DtnSim simulator is introduced as another relevant contribution of this work. Results enabled the authors to identify existing CGR weaknesses and enhancement opportunities