Although existing sensor networks employ wireless communication, they were developed for different requirements than those posed by industrial systems. The wireless connectivity is therefore a critical component of IIoT. ![]() The Industrial Internet of Things (IIoT) is crucial in this transformation since it enables massive collection of data, and process control without a wired infrastructure put into place. Through concepts such as Industry 4.0, this is expected to significantly increase productivity and open for new applications. ![]() Altogether this allows us to point out challenges in existing work and identify areas for future research, including fault tolerance, scalability, non-convergecast traffic patterns, and hybrid scheduling strategies.Ī transformation is ongoing in industry where information technology (IT) is being integrated with operational technology (OT). Further, each scheduler is evaluated qualitatively to identify its objectives. This reveals trends such as increasing complexity and the utilization of centralized principles in several collaborative schedulers. Each of the 76 schedulers is analyzed into their common components to allow for comparison between schedulers and a deeper understanding of functionality and key properties. For each category and the field as a whole, we provide a holistic view and describe historical trends, highlight key developments, and identify trends, such as the attention towards autonomous mechanisms. We survey the literature for these schedulers, describe and organize them according to their operation: Centralized, Collaborative, Autonomous, Hybrid, and Static. The properties of a TSCH network are defined by the schedule, which dictates transmission opportunities for all nodes. In order for wireless networks to meet the strict requirements of the industrial domain, the Time Slotted Channel Hopping (TSCH) MAC is often employed. The Industrial Internet of Things (IIoT) bridges this gap by employing wireless connectivity and IP networking. These concepts require extensive connectivity far beyond what is provided by traditional industrial networks. ![]() Concepts such as Industry 4.0 and Cyber-Physical Systems may bring forward a new industrial revolution.
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