Abstract
The continuous proliferation of applications requiring wireless connectivity will eventually result in latency and reliability requirements beyond what is achievable with current technologies. Such applications can for example include industrial control at the sensor-actuator level, intra-vehicle communication, fast closed loop control in intra-body networks and intra-avionics communication. In this article, we present the design of short range Wireless Isochronous Real Time (WIRT) in-X subnetworks aimed at life-critical applications with communication cycles shorter than 0.1 ms and outage probability below 10 -6 . Such targets are clearly beyond what is supported by the 5th Generation (5G) radio technology, and position WIRT as a possible 6th Generation (6G) system. WIRT subnetworks are envisioned to be deployed for instance in industrial production modules, robots, or inside vehicles. We identify technology components as well as spectrum bands for WIRT subnetworks and present major design aspects including frame structure and transmission techniques. The performance evaluation considering a dense scenario with up to 2 devices per m 2 reveal that a multi-GHz spectrum may be required for ensuring high spatial service availability. The possibility of running WIRT as an ultra-wideband underlay system in the centimeter-wave spectrum region is also discussed. Aspects related to design of techniques for the control plane as well as enhancements to the presented design is the focus of our ongoing research.
Highlights
Wireless communication is identified as a major enabler of the Industry 4.0 vision [1], aiming at enhanced productivity via dynamic allocation of production resources, agile scalability, improved efficiency and flexibility [2]
We present a potential design of a novel radio system for the support of isochronous real time traffic for closed loop control, whose cycle times are a factor of ∼ ×10 shorter than the latency targets of existing radio technologies (i.e., ≤ 0.1 ms)
In [26], we presented a possible system architecture where multiple Wireless Isochronous Real Time (WIRT) subnetworks are connected via a 5th Generation (5G) NR network, that can guarantee reliable communication with a few ms latency over hundreds of meters range
Summary
Wireless communication is identified as a major enabler of the Industry 4.0 vision [1], aiming at enhanced productivity via dynamic allocation of production resources, agile scalability, improved efficiency and flexibility [2]. Other relevant examples of wireless industrial technologies are ISA 100.11a [13], WIA-PA [14], WIA-FA [15] Given their dependency on physical layer standards designed for other purposes, such technologies have inherent design limitations which impede them to achieve the low latencies demanded by the most challenging industrial applications [16]; further, they operate in the crowded 2.4 GHz unlicensed spectrum where interference is a major limiting factor for achieving high reliability. We present a potential design of a novel radio system for the support of isochronous real time traffic for closed loop control, whose cycle times are a factor of ∼ ×10 shorter than the latency targets of existing radio technologies (i.e., ≤ 0.1 ms).
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