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Descripción
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| This paper investigates an optimal DTN message transfer using proactive fragmentation strategies to give service to a ground sensor network using a nanosatellite communications link which uses a multi-access mechanism with priority in downlink traffic (ALOHAGP) searching a cross-layer optimization. This new multiple access protocol is based on unslotted ALOHA extended with an adaptive contention mechanism. It uses satellite feedback to implement the congestion control, and to dynamically adapt the channel effective throughput in an optimal way. The effective throughput has been optimized by adapting the protocol parameters as a function of the current number of active sensors received from satellite. Also, there is currently no method for advertising or negotiating the maximum size of a bundle which can be accepted by a bundle agent in satellite communications for storage and delivery, so that bundles which are too large can be dropped or which are too short are inefficient. We have characterized this kind of scenario obtaining a probability distribution for frame arrivals to nanosatellite and visibility time distribution that provide an optimal proactive fragmentation of DTN bundles. We have found that the proactive effective throughput (goodput) reaches almost a 90% of the reactive fragmentation approach. | |
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Internacional
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JCR del ISI
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Título de la revista
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AD HOC NETWORKS JOURNAL (ELSEVIER) |
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ISSN
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1570-8705 |
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Factor de impacto JCR
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1,53 |
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Información de impacto
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Volumen
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DOI
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Número de revista
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