Algoritmo de gerenciamento de retransmissão em nível de aplicação para redes LoRaWAN

Abstract

The Internet of Things (IoT) characterizes objects and devices that have the ability to communicate with the Internet. Among the wireless network technologies used by IoT devices, LoRa modulation and the LoRaWAN protocol are highlighted in low-energy, wide-area urban solutions. However, in LoRa networks, the exchange of messages between the devices and the access point often suffers from various interferences that impair the signal quality and result in data loss. As the LoRaWAN protocol does not present any mechanism to guarantee the delivery of data, an algorithm is proposed to manage the retransmissions of lost messages. Different from previous proposals, this work proposes an algorithm to operate at the application level through bidirectional communication between device and application server. The algorithm is practically evaluated in real application scenarios in order to verify its impact when guaranteeing data delivery. A comparison is also made with the CR-LoRaWAN algorithm, already developed for retransmissions in LoRa networks. In the comparison, the main differences between the algorithms and their behavior through different tests are highlighted. From the results obtained, the effectiveness of the approach adopted is evidenced, revealing its performance in different executions.