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Optimal RTO Timer for Best Transmission Efficiency of DTN Protocol in Deep-Space Vehicle Communications

机译：最佳RTO计时器，可在深空飞行器通信中实现DTN协议的最佳传输效率

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摘要

The delay/disruption-tolerant network (DTN) was proposed as an end-to-end networking architecture for file delivery service in a stressed communication environment. A typical application of DTN technology is for reliable data delivery in deep-space vehicle communications. The main protocol of DTN, i.e., bundle protocol (BP), utilizes a store-and-forward mechanism and a custody transfer option for transmission reliability. However, little work has been done on the performance evaluation of DTN's BP in deep-space communications. In this paper, we present a study of the retransmission timeout (RTO) timer setting for the use of BP for reliable file (or data) transmission over a relay-based deep-space vehicle communication infrastructure characterized by extremely long latency, lossy data links, and highly asymmetric channel rates. Unlike most studies proposed for terrestrial Internet for which the RTO timer is set equal to or longer than the round-trip time (RTT), we propose to set the RTO timer shorter than the RTT and expect that it will increase delivery efficiency per unit of time. We intend to find an RTO timer setting for maximum data delivery performance of BP, which is considered to be an optimal RTO timer, for deep-space missions. For the first time, analytical models are built for delivery performance involving the RTO timer. Using the built models, we tune the RTO timer toward the highest data delivery performance. The models are validated by running text file transfer experiments using a PC-based testbed and tuning the RTO timer toward the best performance of BP. A performance comparison between the optimal RTO timer proposed in this study and the existing commonly used RTO timers is also presented.
机译：延迟/中断容忍网络（DTN）被提出作为在压力通信环境中用于文件传递服务的端到端网络体系结构。 DTN技术的典型应用是在深空飞行器通信中可靠地传递数据。 DTN的主要协议（即捆绑协议（BP））利用存储转发机制和贸易交接选项来提高传输可靠性。但是，在DTN BP在深空通信中的性能评估方面所做的工作很少。在本文中，我们对重传超时（RTO）计时器设置进行了研究，该设置用于将BP用于基于中继的深空飞行器通信基础设施上的可靠文件（或数据）传输，其特点是等待时间长，数据链路损耗极长，以及高度不对称的频道速率。与针对RTO计时器设置为等于或大于往返时间（RTT）的针对陆地Internet的大多数研究不同，我们建议将RTO计时器设置为比RTT短，并期望它将提高单位时间的传输效率。时间。我们打算找到一个RTO计时器设置，以实现BP的最大数据传输性能，这被认为是用于深空任务的最佳RTO计时器。首次为涉及RTO计时器的交付性能构建了分析模型。使用构建的模型，我们将RTO计时器调整为最高的数据传输性能。通过使用基于PC的测试平台运行文本文件传输实验，并将RTO计时器调整为BP的最佳性能，可以对模型进行验证。还提出了本研究中提出的最佳RTO计时器与现有的常用RTO计时器之间的性能比较。

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