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Wireless industrial real-time networks with Li-Fi

: Faulwaßer, Michael; Noack, Alexander; Ostermann, Robert; Schneider, Tobias; Zschorn, Christopher

Embedded world Conference 2017 : 14th - 16th March 2017, Nuremburg, Germany
Haar: WEKA Fachmedien, 2017
ISBN: 978-3-645-50170-5
4 S.
Embedded World Conference <2017, Nuremburg>
Fraunhofer IPMS ()

The increase of industrial automation and machine-to-machine (M2M) communication confronts engineers to provide reliable and secure networks. Real-time protocols ensure a deterministic behavior and allow a scalable number of nodes. Present networks require high bandwidth merely by the number but also by the amount of complex sensor data. Wired Ethernet based real-time protocols with 100Base-T/FX are presently widely used and provide a bandwidth up to 100 Mbit/s. Wireless protocols appear to simplify the extensive integration of systems in comparison to interfacing with wired protocols. Under the aspects of reliable communication the engineer is confronted with additional challenges of an open communication channel. In contrast to wired technologies, wireless networks have also to take into account security issues, interferences, regulation of irradiated power and missing EMI shielding. Radio frequency (RF) technologies point in coverage and are suitable in most applications with relaxed soft real-time requirements. In hard real-time applications it is challenging and depends on the environment with careful analysis work regarding open channel requirements. Light communication technologies, also called Li-Fi technologies, are another option for wireless networking. The usage of defined light spots allows a better handling of the channel which increases the reliability and makes it attractive for wireless real-time communication. In this paper we analyze full-duplex bi-directional Li-Fi systems for usability in isochronous real-time networks. Wired and wireless systems are compared to each other regarding implementation requirements, effort and limitations underlined by measurements in different real-time test environments. Tests include detailed investigations of response time and comparison between wired and optical wireless networks.