Percorrer por autor "Lobo, Leonor Sofia Rodrigues"
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- Implementation and evaluation of a relay system for LoRaWAN-based IoT networksPublication . Lobo, Leonor Sofia Rodrigues; Cota, Nuno António Fraga Juliano; Cruz, Nuno Miguel MachadoAbstract The rapid expansion of IoT has revolutionized various industries, yet its growth remains limited in remote areas where traditional network infrastructures, such as mobile networks and satellites, are either unreliable or too costly to implement. This thesis explores the use of LoRaWAN as a promising solution for low-power, long-range communication in remote locations. Despite its advantages, LoRaWAN faces challenges in areas with weak backhaul infrastructure or longdistance communication needs. To address these issues, this work proposes and implements a relay system composed of two devices: the C-Mesh, which acts as a gateway and listens continuously to end-devices messages and the C-Point, which encapsulates and forwards those uplinks. A dedicated communication protocol between C-Mesh and C-Point was developed, including a mechanism to update OTAA session keys over BLE. The potential of LoRa Mesh and satellite networks is also explored, along with the study of existing relay systems, such as the TS011-1.0.0 specification, that provide useful design insights. Field tests showed that the proposed relay increased delivery from 12.0% to 47.3% and raised the message receptions with SNR > 0 dB from 16.2% to 42.1%, confirming its role in extending LoRaWAN coverage and improving signal quality.