Enhancement of MAC Protocol for Power Reduction in LoRa WAn

With the increasing use of the Internet of Things (IoT), various LPWA standards are being introduced. The authors focused on the LoRaWAnstandard with low power consumption and transmission distance of several kilometers. As ALOHA is adopted for the LoRaWAN MAC protocol, its communication collision increases as the number of nodes increases. Therefore, a back-off process becomes necessary, and the power consumption is increased by the back-off process during its operation. In this paper, we propose an enhancement to the LoRaWAN MAC protocol, which enables communication collision avoidance and sleep control of the end nodes.