Adaptive Resource Allocation for LTE/WiFi Coexistence in the Unlicensed Spectrum
Jianxin Dai, Cong Shen · 2018 International Conference on Computing, Networking and Communications (ICNC) · 2018
Unlicensed spectrum, unlike its licensed counterpart, has to be shared by multiple technologies and hence the performance is heavily impacted by cross-technology interference. In this paper, we focus on the coexistence mechanism of LTE andWiFi in the unlicensed spectrum.We first develop a simple yet effective model for the LTE-U throughput analysis, and then propose a fair coexistence criterion and design the duty cycle allocation that optimizes the Carrier Sensing Adoptive Transmission (CSAT) mechanism for LTE-U/WiFi. Furthermore, we design a Throughput Optimal Channel Selection (TOCS) algorithm for LTE-U devices to achieve optimal channel allocation. Simulation results demonstrate that the new methods can improve the total system throughput while guaranteeing fairness between LTE-U and WiFi, which is critical to the adoption of LTE in the unlicensed spectrum.