Opportunities and limits of moderate source routing in delay-/disruption-tolerant networking space networks,International Journal of Satellite Communications and Networking

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Opportunities and limits of moderate source routing in delay-/disruption-tolerant networking space networks
International Journal of Satellite Communications and Networking ( IF 0.9 ) Pub Date : 2021-08-18 , DOI: 10.1002/sat.1421
Edward J. Birrane ₁ , Carlo Caini ₂ , Gian Marco De Cola ₂ , Federico Marchetti ₂ , Laura Mazzuca ₂ , Lorenzo Persampieri ₂

Affiliation

This paper aims to investigate the potential advantages and also the limits of source routing when applied to delay-/disruption-tolerant networking (DTN) space networks. To this end, it uses a variant of contact graph routing (CGR) called moderate source routing (MSR), recently proposed by the authors and fully compatible with interplanetary overlay network (ION), the DTN suite developed by NASA-JPL. MSR differs from standard CGR as the route to destination is not recalculated from scratch at each node, but possibly reused, if still valid, by next nodes. For this purpose, the route is saved in a dedicated extension block of the forwarded bundle (the data unit of the bundle protocol, used in DTN). Performance of MSR versus CGR is assessed by considering a simple but very challenging space layout. Numerical results, obtained on a GNU/Linux testbed, show that MSR is effective at reducing the chances of loops, in particular when the source has full knowledge of the state of the network; otherwise, network instabilities are still possible. In this case, they can be neutralized by means of the combined use of source routing and anti-loop tools, as shown in the paper. A further advantage of MSR is that it is compatible with standard CGR, which would facilitate a gradual or partial deployment.

中文翻译：

延迟/中断容忍网络空间网络中适度源路由的机会和限制

本文旨在研究源路由在延迟/中断容忍网络 (DTN) 空间网络中的潜在优势和局限性。为此，它使用了一种称为中等源路由 (MSR) 的接触图路由 (CGR) 的变体，这是作者最近提出的，并且与 NASA-JPL 开发的 DTN 套件星际覆盖网络 (ION) 完全兼容。MSR 与标准 CGR 不同，因为到达目的地的路线不是在每个节点从头开始重新计算，而是可能被下一个节点重用（如果仍然有效）。为此，路由保存在转发包的专用扩展块中（包协议的数据单元，在 DTN 中使用）。通过考虑一个简单但非常具有挑战性的空间布局来评估 MSR 与 CGR 的性能。在 GNU/Linux 测试平台上获得的数值结果，表明 MSR 在减少循环机会方面是有效的，特别是当源完全了解网络状态时；否则，仍然可能出现网络不稳定。在这种情况下，可以通过源路由和反环路工具的组合使用来消除它们，如本文所示。MSR 的另一个优点是它与标准 CGR 兼容，这将有助于逐步或部分部署。

更新日期：2021-08-18

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