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arXiv 2007.06598cs.ITmath.IT
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无线供电协作网络信息分析的平均峰值年龄

Average Peak Age of Information Analysis for Wireless Powered Cooperative Networks

Yasaman Khorsandmanesh, Mohammad Javad Emadi, Ioannis Krikidis

摘要:

信息时代(AoI),一个指标来分析数据的新鲜度,是在即将到来的无线网络的时间关键型应用的兴趣。此外,无线能量传输(WPT)也是延长无线传感器网络寿命的关键。因此,我们研究了一个平坦衰落的无线供电合作网络,其中一个源和一个继电器充电的有限大小的电容器从一个远程发电站收集能量。对于两种传统的解码转发(DF)和放大转发(AF)中继,研究了平均AoI和峰值AoI(PAoI),以说明数据/功率传输信道的随机性和电容器的大小如何影响年龄指标,以及何时利用协作传输比直接传输更有益。结果表明,虽然功率受限的中继施加更多的延迟开销,年龄指标在某些情况下得到改善。即使对于具有更多信号处理等待时间的DF方案,由于增强了端到端通信可靠性,我们也可以实现较低的平均PAoI。此外,所提出的WPT协作系统的特殊情况下进行了讨论,例如全功率节点和一次性成功的数据传输的情况下。最后,数值结果提供突出的影响,传输功率,电容器的大小,和路径损耗指数的年龄指标。

英文摘要:

Age of information (AoI), a metric to analyse data freshness, is of interest for time-critical applications in upcoming wireless networks. Besides, wireless power transfer (WPT) is also essential to prolong lifetime of a wireless sensor network. Thus, we study a flat-fading wireless powered cooperative network, wherein a source and a relay charge their finite-sized capacitors by harvesting energy from a remote power station. For two conventional decode-and-forward (DF) and amplify-and-forward (AF) relaying, average AoI and peak AoI (PAoI) are studied to show how the randomness of the data/power transfer channel and size of the capacitors affect the age metrics, and when utilizing a cooperative transmission is more beneficial than direct one. It is shown that, although the power-limited relay imposes more delay overhead, the age metrics are improved in some circumstances. Even for the DF scheme with more waiting time for signal processing, we may achieve lower average PAoI due to enhancing the end-to-end communications reliability. Furthermore, special cases of the proposed WPT cooperative system is discussed, e.g. cases of full-power nodes and one-shot successful data transmission. Finally, numerical results are provided to highlight effects of transmission power, size of the capacitors, and path loss exponent on the age metrics.

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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