Abstract
Wireless sensor networks (WSNs) have been widely used in industrial systems that demand a high degree of reliability and real-time performance in communications. However, because of limited network resources and delays caused by transmission conflicts and channel contention, many industrial applications cannot meet these demands. To resolve these issues, we introduce Narrow Band Internet of Things (NB-IoT) technology into industrial networks to reduce transmission delays. Two challenges are addressed in this work: (1) the primary goal is to guarantee the schedulability of the system, so the controller must determine when NB-IoT nodes transmit to base stations; and (2) because communication through the base station is a paid service, the controller must minimize the use of NB-IoT slots. We resolve these issues via a scheduling analysis and transmission mode selection. In addition, we propose a Path Selection Algorithm (PSA) to improve the schedulability of the industrial system. Experiments indicate the effectiveness and efficacy of our approach.
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