Minoru Inomata

Path loss prediction model for 800 MHz to 37 GHz in NLOS microcell environment

Fifth generation (5G) mobile communication systems are being actively investigated to increase the system capacity. For 5G, utilizing frequency bands above 6 GHz is being investigated because it is considered that ensuring a wide frequency band above 6 GHz is relatively easier than that under 6 GHz, which is used for IMT-Advanced systems. In this report, a site general type path loss prediction model for 5G system radio link design is investigated for the above mentioned frequency band in a non-line-of-sight (NLOS) microcell environment. More specifically, based on measurement data, extending the applicable frequency range of the path loss prediction model for a hexagonal layout in a NLOS microcell environment for under 6 GHz, which is defined in Report ITU-R M.2135, is investigated. The root mean square of the prediction error (RMSE) of the original M.2135 prediction model increases with an increase in frequency; however, the model modifies the frequency term of M.2135 which improves the RMSE at higher frequencies.

Effects of building shapes on path loss up to 37 GHz band in street microcell environments

Measurement results of path loss characteristics up to 37 GHz band in street microcell environments are described. Ray tracing is used to analyze the effects of building shapes on path loss characteristics at an intersection. A comparison between measured and calculated results clarified the dominant paths in which specular reflection from a chamfered shaped building contributes the power. The results show that the median prediction error value ranged from about 4.1 to 7.0 dB for bands between 2.2 and 37.1 GHz. This confirms that the building shapes significantly affect the path loss characteristics in NLOS street microcell environments.