Multi-Layered Energy Efficiency in LoRa-WAN Networks: A Tutorial Cheikh, Imane ; Aouami, Rachid ; Sabir, Essaid ; Sadik, Mohamed ; Roy, Sébastien Abstract Publication: IEEE Access Pub Date: 2022 DOI: 10.1109/ACCESS.2021.3140107 Bibcode: 2022IEEEA..10.9198C