A method for Forecasting Available Spectrum Resources with Location-Dependent Error Margin for Dynamic Spectrum Access
Tatsuya Nagao, Takahiro Hayashi, Yoshiaki Amano · 2021 IEEE 94th Vehicular Technology Conference (VTC2021-Fall) · 2021
In higher frequency bands such as the millimeterwave band, which is expected to be utilized in the future, the received power fluctuates significantly due to changes in the propagation environment. Therefore, the spatial and temporal spectrum sharing between different wireless systems will be more practical. Some methods have been proposed to predict future spectrum usage, but prediction errors are unavoidable. There is a trade-off between the detection rate of future available spectrum resources and the false detection rate caused by prediction errors. Still, there is no established method for balancing these two factors. One conservative prediction to reduce false detections is to set a certain margin. However, the fluctuation tendency depends on the location, which results in an excessive margin in some sites, resulting in a lower detection rate. In this paper, we propose a method to set a location-dependent margin by considering the error characteristics of the constructed prediction model of received power. The proposed method enables us to increase the detection rate while reducing the false detection rate. The evaluation results by simulation in an urban area show that the proposed method can improve the detection rate by 10.6% while keeping the false detection rate, compared to when using a constant margin.