An Uplink Synchronization scheme for LoRaWAN Class B

The channel access technique of LoRaWAN hinders the thorough utilization of channel capacity since it was not designed to exclusively limit or even avoid collisions, but rather with simplicity and energy consumption in mind. As a consequence, in presence of plenty of active nodes, the overall performance offered by a LoRaWAN Network can be poor. In this paper, we propose a new synchronized Uplink transmission scheme to improve the performance of data transmissions for LoRaWAN class B end-devices which are suitable for IoT applications with low latency requirements and regular traffic. In contrast to related works, our proposal is defined without modifying the fundamentals of the original ALOHA based channel access technique, but simply takes advantage of Class B downlink synchronization. Our preliminary analysis based on an analytic model shows an enhancement of performances regarding data transmission success.