Co-existence analysis of duty cycle method with Wi-Fi in unlicensed bands

For the effective utilization of the limited spectrum resources, it comes into the spotlight to extend the frequency band of wireless communication services such as LTE to unlicensed band. Because Wi-Fi service is widely used in the concerned band, the performance of co-existence should be investigated. Several methods for sharing spectrum are considered and duty cycle (DC) based method is one of the potential candidates. In this paper, co-existence performances of duty cycle method with Wi-Fi are analyzed. The collisions and latency according to the various DC and DC-on times are investigated. Using Monte-Carlo simulations, collisions at first transmission and the cumulated collisions until one transmission per each device is completed are provided. Also, results on latency and the ratio of latency to the total channel occupancy time per device type are presented.