Channel Assignment for Coexistence of WiFi and LTE using Unlicensed Band Considering Uplink Communications

In recent years, LAA (Licensed Assisted Access using LTE), which is an LTE system using unlicensed bands, has been studied. Since the frequency utilization efficiency of LAA is higher than that of WiFi, LAA achieves higher throughput. However, LAA can cause significant interference with WiFi, since they use the same frequency band. The existing research derives a proportional allocation method for fair coexistence between LTE-U and WiFi by using a method that dynamically adapts the probability that an LTE-U network will access a channel. But, it considers downlink traffic only. When both downlink/uplink communications are ongoing via common AP, the downlink throughput decreases due to CSMA/CA. In this paper, considering the uplink communication, we propose a method to assign LAA channels to improve the average throughput while maintaining the minimum throughput.