A Novel Method to estimate Propagation for Spectrum Sharing between 5G mm Wave access and Wireless Backhaul

Millimeter wave (mmWave) bands will be newly used for 5G access, but these are currently being used as wireless backhaul. In addition, a new method of self-backhauling in 5G is being examined by 3GPP. Therefore, a technology that enables dense spectrum sharing between 5G and wireless backhaul is required. The existing method used for dense spectrum sharing is to assess the wireless backhaul and 5G propagation losses in order to calculate mutual interference. This paper proposes a novel method to estimate propagation which combines the simple empirical model, and the physically rigorous deterministic model, by focusing on the mm Wave characteristics to endure that the diffraction loss is large and the influence of the reflected wave is dominant. The proposed method is evaluated with the measurement results of the commercial mm Wave wireless backhaul to show that the proposed method improves the accuracy rate of the coexistence area. This is because it is able to estimate the interference area with a higher accuracy than the conventional model.