CHR: A Novel Channel-Hopping-Based Retransmission Scheme in WIA-FA Networks

Industrial wireless sensor networks for factory automation are globally considered as an integral part of smart manufacturing. Wireless networks for industrial automation-factory automation (WIA-FA) is the first and only international standard specifying industrial wireless sensor networks for time-sensitive automation applications. In this article, a channel-hopping-based retransmission (CHR) scheme for WIA-FA networks is proposed. To take advantage of strictly limited communication resources, we design CHR as a hybrid scheduling-based retransmission scheme that is composed of a cyclic reservation diversity retransmission (CRDR) scheme and an on-demand retransmission (ODR) scheme. For device fairness and channel diversity, we propose to combine time-slotted channel hopping with retransmission schemes. Furthermore, we perform the reliability analysis to CHR, guiding the dynamic selection of retransmission schemes according to the actual traffic and available communication resources. Simulation results demonstrate that CHR outperforms existing retransmission schemes in transmission reliability and worst case latency.