Modeling indoor-outdoor propagation in wooden residential area at 2.5 GHz and 3.5 GHz bands

To deal with the explosion of wireless traffic, the authors are now considering a new system at 3.5 GHz band, which consists of small outdoor cells constructed by access points set up indoor. In order to utilize this system, measurement-based propagation modeling in multiple frequencies is necessary. In this paper, the authors propose the new modeling method for indoor-outdoor propagation when buildings are arranged side-by-side in parallel. Additionally, the authors derive a fitting parameter at 2.5GHz and 3.5 GHz in order to compare characteristics of the target frequency with those of a frequency in service. The result shows that indoor obstacles have notable effect to path loss exponent whereas little effect to a path loss offset, while a path loss offset has a dominant effect when it comes to a difference of a frequency. Moreover, the authors confirm our model can predict a shadow fading accurately compared with previous indoor-outdoor propagation model.