5G, millimetre wave, human blockage, environmental blockage, double knife-edge diffraction.

As 5G communication may use Millimetre waves (mmWave) bands, it is essential to estimate short range indoor links from blockage point of view. This study presents some initial studies for characterizing effects of human body movement on short range link. To the best of our knowledge, this study is the first to experimentally examine the effects of human body movement at this band. This study also presents a simple approach to characterize the effects of scattering objects around indoor links at 28 GHz while the link is fully blocked by human body. The effects of scattering objects close to the link were carried out by performing measurements with a metallic reflector and human body. Here, fundamental mechanisms of wave propagation such as reflection and diffraction were accounted for each scattering object. To predict the attenuation produced by metallic reflector, specular reflection model was used in reflection modelling. In diffraction modelling, on the other hand, the double knife-edge diffraction (DKED) model was exploited to predict the attenuation by human body. Simulations were then compared with measurements to estimate the prediction accuracy of the models. Results indicate that presented simple models work well for indoor links. Therefore, the results of this study could be extended to model multiple human body near the indoor links of fifth generation (5G) systems.