Internet of Things (IoT) is a rapidly emerging technology which involved both a variety of research and a very wide range of industrial fields. It is increasingly interested in the use of a long range wide area network (LoRaWAN) to remotely monitor and manage the number of devices in real-time. In order to better manage and control a lot of devices, multicast is sometimes more suitable than unicast. However, in the LoRaWAN specification, unicast MAC transmission is only described but multicast MAC transmission is not specified. In this paper, we propose the multicast activation scheme to support multicast MAC transmission based on LoRaWAN. The presented scheme can reduce the energy consumption required for downlink and be used as a guideline for developing LoRaWAN-based IoT applications.
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