Unicast Subslot Scheduling for Wi-SUN FAN System with Packet Collision Reduction

Wi-SUN FAN, a global standard wireless communication technology for building large-scale multi-hop networks, enables robust network operation through CSMA/CA-based MAC protocol and neighbor synchronized channel hopping. However, packet collision due to the Hidden Node Problem between child nodes with the same RPL preferred parent is a problem to be resolved. We propose a unicast subslot scheduling scheme to solve this problem and secure a high packet transmission success rate. The proposed method showed up to 27% higher packet transmission success rate in a simulation environment with high traffic, and the tradeoff with latency can be adjusted by modifying parameters.