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Information Freshness of Updates Sent over LEO Satellite Multi-Hop Networks
arXiv - CS - Networking and Internet Architecture Pub Date : 2020-07-10 , DOI: arxiv-2007.05449
Federico Chiariotti, Olga Vikhrova, Beatriz Soret and Petar Popovski

Low Earth Orbit (LEO) satellite constellations are bringing the Internet of Things (IoT) to the space arena, also known as non-terrestrial networks. Several IoT satellite applications for tracking ships and cargo can be seen as exemplary cases of intermittent transmission of updates whose main performance parameter is the information freshness. This paper analyzes the Age of Information (AoI) of a satellite network with multiple sources and destinations that are very distant and therefore require several consecutive multi-hop transmissions. A packet erasure channel and different queueing policies are considered. We provide closed-form bounds and tight approximations of the average AoI, as well as an upper bound of the Peak Age of Information (PAoI) distribution as a worst-case metric for the system design. The performance evaluation reveals complex trade-offs among age, load, and packet losses. The optimal operational point is found when the combination of arrival rates and packet losses is such that the system load can ensure fresh information at the receiver; nevertheless, achieving this is highly dependent on the mesh topology. Moreover, the potential of an age-aware scheduling strategy is investigated and the fairness among users discussed. The results show the need to identify the bottleneck nodes for the age, as improving the rate and reliability of those critical links will highly impact on the overall performance. The model is general enough to represent other multi-hop mesh networks.

中文翻译:

通过 LEO 卫星多跳网络发送的更新信息的新鲜度

低地球轨道 (LEO) 卫星星座正在将物联网 (IoT) 带入太空领域,也称为非地面网络。一些用于跟踪船舶和货物的物联网卫星应用可以被视为更新间歇传输的示例,其主要性能参数是信息新鲜度。本文分析了具有多个源和目的地的卫星网络的信息时代 (AoI),这些源和目的地非常远,因此需要多个连续的多跳传输。考虑了数据包擦除通道和不同的排队策略。我们提供平均 AoI 的封闭形式边界和严格近似值,以及峰值信息 (PAoI) 分布的上限作为系统设计的最坏情况度量。性能评估揭示了年龄、负载和数据包丢失之间的复杂权衡。当到达率和丢包率的组合使得系统负载可以确保接收器处的新鲜信息时,找到最佳操作点;然而,实现这一点高度依赖于网状拓扑。此外,研究了年龄感知调度策略的潜力,并讨论了用户之间的公平性。结果表明需要确定年龄的瓶颈节点,因为提高这些关键链路的速率和可靠性将对整体性能产生很大影响。该模型足以表示其他多跳网状网络。当到达率和丢包率的组合使得系统负载可以确保接收器处的新鲜信息时,找到最佳操作点;然而,实现这一点高度依赖于网状拓扑。此外,研究了年龄感知调度策略的潜力,并讨论了用户之间的公平性。结果表明需要确定年龄的瓶颈节点,因为提高这些关键链路的速率和可靠性将对整体性能产生很大影响。该模型足以表示其他多跳网状网络。当到达率和丢包率的组合使得系统负载可以确保接收器处的新鲜信息时,找到最佳操作点;然而,实现这一点高度依赖于网状拓扑。此外,研究了年龄感知调度策略的潜力,并讨论了用户之间的公平性。结果表明需要确定年龄的瓶颈节点,因为提高这些关键链路的速率和可靠性将对整体性能产生很大影响。该模型足以表示其他多跳网状网络。结果表明需要确定年龄的瓶颈节点,因为提高这些关键链路的速率和可靠性将对整体性能产生很大影响。该模型足以表示其他多跳网状网络。结果表明需要确定年龄的瓶颈节点,因为提高这些关键链路的速率和可靠性将对整体性能产生很大影响。该模型足以表示其他多跳网状网络。
更新日期:2020-07-13
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