Fast and reliable LoRa-based data transmissions

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Zorbas, Dimitrios
Maillé, Patrick
O'Flynn, Brendan
Douligeris, Christos
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Institute of Electrical and Electronics Engineers (IEEE)
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LoRaWAN is a recently proposed MAC layer protocol which manages communications between LoRa-based gate-ways and end-devices. It has attracted much scientific attention due its physical layer characteristics, but mainly due to its versatile configuration parameters. However, it is known that LoRaWAN-based transmissions suffer from extensive collisions due to the unregulated access to the medium. For this reason, various techniques that alleviate the burst of collisions have been proposed in the literature. In this paper, we deal with the problem of fast data delivery in LoRa-based networks. We model a network where transmissions follow a Poisson process. We compute the average packet success probability per Spreading Factor (SF) assuming orthogonal transmissions. We, then, formulate an SF optimization problem to maximize the success probability given an amount of data per node and a maximum data collection time window. We show - both theoretically and using simulations - that the overall success probability can be improved by approximately 100% using optimal SF assignments. We validate our findings using a 10-node testbed and extensive experiments. Despite that experiments reveal the existence of inter-SF interference, our solution still provides the best performance compared to other LoRaWAN configurations.
Access protocols , Optimisation , Probability , Radiofrequency interference , Stochastic processes , Wide area networks , LoRa-based networks , Average packet success probability , Orthogonal transmissions , SF optimization problem , Maximum data collection time window , Optimal SF assignments , LoRaWAN configurations , Recently proposed MAC layer protocol , LoRa-based gate-ways , End-devices , Scientific attention , Physical layer characteristics , Versatile configuration parameters , LoRaWAN-based transmissions , Extensive collisions , Unregulated access , Fast data delivery
Zorbas, D., Maillé, P., O'Flynn, B. and Douligeris, C. (2019) 'Fast and reliable LoRa-based data transmissions', 2019 IEEE Symposium on Computers and Communications (ISCC), Barcelona, Spain, 29 June-3 July. doi: 10.1109/ISCC47284.2019.8969766
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