Improving Redundancy in LoRaWAN for Mixed-Criticality Scenarios (original) (raw)

IEEE Systems Journal, 2021

Abstract

Most Internet of Things applications rely on wireless communication, which ensures flexibility and scalability. However, an increasing number of these applications have real-time constraints and require mixed-criticality. Indeed, the complexity of distributed systems necessarily calls for data exchanges with different priorities and different failure handling. The design of a reliable protocol supporting different traffic priorities must take into account external interferences that can inevitably affect radio links. This article focuses on LoRaWAN, the currently most famous example of low power wide area network technology. In particular, redundant transmissions offered by the proposed LoRa-REP strategy enhance the communication resilience of sporadic critical message transaction (consisting of message uplink and acknowledgment downlink). The implementation by means of “virtual nodes” assures compatibility with legacy deployments (preserving investments) and offers easy scalability. Experimental results obtained with purposely designed test bench confirm the advantages of the proposed solution in a real-world scenario. Notably, the failure probability of a critical transaction drops from 78% of single spreading factor scenario to less than 2.5% with the proposed LoRa-REP.

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