arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2004.11135cs.ITeess.SPmath.IT
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能量收集系统中具有信息源多样性的信息交换

Age-of-Information with Information Source Diversity in an Energy Harvesting System

Elvina Gindullina, Leonardo Badia, Deniz Gündüz

摘要:

信息时代(AoI)是物联网(IoT)系统的关键性能指标之一。及时的状态更新对于许多物联网应用至关重要;然而,它们受到与可用能量和底层信息源的不可靠性相关的严格限制。因此,必须仔细规划状态更新的调度以节省能量,但同时,可能发生的是,当需要状态更新时,没有可靠的最新信息内容要刷新。作为克服这些不可预测性的解决方案,可以采用跟踪相同感兴趣信号但具有不同能量成本和可靠性的多个源,我们称之为信息源多样性。我们考虑一个能量收集监测节点配备了一个有限大小的电池和收集状态更新从多个异构信息源。我们调查的政策,最大限度地减少平均AOI,并评估信息源多样性对系统性能的作用。为此,我们将问题表述为马尔可夫决策过程(MDP)。最优策略表示基于监控节点处的当前能量水平和AoI来调度动作,诸如来自源之一的更新或保持空闲。我们分析了不同的成本/AoI分布组合的最优解决方案的结构,并比较了性能的最优策略与积极的战略,只要有可能传输。

英文摘要:

Age of information (AoI) is one of the key performance metrics for Internet of things (IoT) systems. Timely status updates are essential for many IoT applications; however, they are subject to strict constraints related on the available energy and unreliability of underlying information sources. Hence, the scheduling of status updates must be carefully planned to preserve energy, but at the same time, it may happen that when a status update is needed, there is no reliable up-to-date information content to refresh. As a solution to overcome these unpredictabilities, one can employ multiple sources that track the same signal of interest, but with different energy costs and reliabilities, which we call information source diversity. We consider an energy-harvesting monitoring node equipped with a finite-size battery and collecting status updates from multiple heterogeneous information sources. We investigate the policies that minimize the average AoI, and evaluate the role of information source diversity on the system performance. To do so, we formulate the problem as a Markov decision process (MDP). The optimal policy represents the scheduling of actions, such as an update from one of the sources or remaining idle, based on the current energy level and the AoI at the monitoring node. We analyze the structure of the optimal solution for different cost/AoI distribution combinations, and compare the performance of the optimal policy with an aggressive strategy that transmits whenever possible.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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