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Wireless Factory Automation: Radio Channel Evolution in Repeated Manufacturing Processes

机译：无线工厂自动化：重复制造过程中的无线电频道演变

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摘要

Wireless technologies have to be enhanced to meet the latency and reliability requirements of mission-critical machine-type communication (MTC) in automation systems. Investigating the characteristics of radio channels in typical factory environments is fundamental when designing the wireless industrial Internet of the future. In this paper, we provide results of an indoor channel measurement campaign in a representative factory automation lab. The measurements were performed at a carrier frequency of 2.25 GHz. We focus on communication between industrial robots and their controller entities over short distances. Our use case is a pick-and-place process with repetitions. We allow other active machinery and moving personnel nearby the automation cell. Based on the power delay profile and the corresponding power spectral density, we analyze the time evolution of channel snapshots on fixed spatial positions in repeated processes. Furthermore, we study the correlation of successive channel profiles along the process trajectory. By obtaining high channel correlation over time, we show that scattering and reflection effects from active and moving obstacles surrounding the manufacturing area are limited. Our findings allow a channel-aware planning of wireless control loops by optimized link adaption in wireless systems.
机译：必须增强无线技术，以满足自动化系统中任务关键机器型通信（MTC）的延迟和可靠性要求。在设计未来的无线工业互联网时，研究典型工厂环境中无线电频道的特性是基本的。在本文中，我们提供了代表工厂自动化实验室的室内渠道测量活动的结果。测量以2.25GHz的载波频率进行。我们专注于工业机器人与其控制器实体在短距离之间的沟通。我们的用例是重复的拣选过程。我们允许其他主动机械和移动人员在自动化单元附近。基于功率延迟曲线和相应的功率谱密度，我们分析了在重复过程中固定空间位置上的信道快照的时间演变。此外，我们研究了沿过程轨迹的连续信道谱的相关性。通过随着时间的推移获得高通道相关性，我们表明，来自制造区域周围的主动和移动障碍的散射和反射效应是有限的。我们的调查结果允许通过无线系统中的优化链接适应进行无线控制循环的通道感知计划。

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