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Message fragmentation assessment in DTN nanosatellite-based sensor networks

机译：基于DTN纳米卫星的传感器网络中的消息碎片评估

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This paper proposes a proactive fragmentation mechanism for an optimal DTN message transfer. DTN message transfer is presented to give coverage to a terrestrial sensor network by using a nanosatellite communications link. Satellite communication is modeled with a multi-access mechanism with priority in downlink traffic (ALOHAGP). 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, regarding the optimal size of a bundle, there is a lack of standard negotiation methods of bundle sizes that can be accepted by a bundle agent in satellite communications. Thus, too large bundles are dropped and too small messages are inefficient. We have characterized this kind of scenario obtaining a probability distribution for frame arrivals to nanosatellite and visibility time distribution providing an optimal proactive fragmentation of DTN bundles. We have found that the proactive effective throughput (goodput) reaches in some cases almost 97% of the reactive fragmentation approach. (C) 2016 Elsevier B.V. All rights reserved.
机译：本文提出了一种用于最佳DTN消息传输的主动分段机制。提出了DTN消息传输，以通过使用纳米卫星通信链路来覆盖地面传感器网络。卫星通信采用下行链路流量（ALOHAGP）中优先级的多址访问机制进行建模。这种新的多址访问协议基于以自适应竞争机制扩展的未分配时隙的ALOHA。它使用卫星反馈来实现拥塞控制，并以最佳方式动态调整信道有效吞吐量。通过根据从卫星接收到的有源传感器的当前数量来调整协议参数，可以优化有效吞吐量。另外，关于捆绑包的最佳大小，缺乏在卫星通信中捆绑包代理可以接受的捆绑包大小的标准协商方法。因此，太大的包被丢弃，太小的消息效率低下。我们已经表征了这种场景，该场景获得了帧到达纳米卫星的概率分布和可见性时间分布，从而提供了DTN束的最佳主动分段。我们发现，在某些情况下，主动有效吞吐量（吞吐量）几乎达到了反应碎片方法的97％。 （C）2016 Elsevier B.V.保留所有权利。

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