Soutenance de thèse : Gwendoline HOCHET DERÉVIANCKINE

« Feasibility and performance of a LoRa 2.4 GHz network »

Doctorante : Gwendoline HOCHET DERÉVIANCKINE

Laboratoire INSA : CITI
École doctorale : ED512 : Informatique et Mathématiques de Lyon

Long-range (LoRa) technology and the LoRaWAN protocol, which mainly uses the sub- GHz frequency bands, subject to regional laws, have become more widely used as a result of the rise of the Internet of Things (IoT). To overcome these limitations, Semtech has released a version of LoRa dedicated to the 2.4 GHz industrial, scientific, and medical (ISM) band, which, among others, is common worldwide and has no duty-cycle limitations. However, this frequency band is already used by many wireless technologies, such as Wi-Fi and Bluetooth (BT), as well as by common devices like microwaves and surveillance cameras. It is essential to evaluate the feasibility and possible performance of this frequency shift before deploying LoRa on a large scale in the 2.4 GHz ISM band.
This thesis proposes a comprehensive experimental evaluation of LoRa technology in the
2.4 GHz ISM band, including a comparison of its communication range and reliability with the European sub-GHz band (868 MHz). We also study the coexistence of LoRa and Wi-Fi when they are overlapping transmissions. To improve the coexistence, we propose and compare several frequency hopping (FH) strategies for LoRa. Although the latter proposal is based on simulation, we also propose an original methodology for evaluating a frequency band and selecting the less noisy channels, which could facilitate the implementation of FH strategies in future LoRa 2.4 GHz gateways. Our work provides important recommendations for the deployment and expansion of LoRa in the 2.4 GHz ISM band.