5G Wireless Access Experiment

This chapter describes millimeter-wave experiment trials for 5G. 5G is the first mobile communication system that exploits millimeter-wave bands such as 28 GHz, and for overcoming a larger path loss in the millimeter-wave bands, massive MIMO technologies were introduced for 5G to obtain beamforming gain. 5G experiment trials to verify the massive MIMO technologies were conducted for realizing 5G radio access, and additional experiment trials on advanced massive MIMO technologies for further enhancement of 5G, so-called 5G Evolution/5G-Advanced are being performed. This chapter briefly introduces an overview and results of DOCOMO’s millimeter-wave experiment trials for 5G and 5G Evolution. For beyond 5G and 6G, extremely high data rate exceeding 100 Gbps is required, and hence so-called THz (sub-THz) wave targeting the frequency from 100 GHz to 300 GHz has attracted much attention. This chapter also shows over-100 Gbps throughput and coverage performances by link-level simulations using a 100 GHz-band massive MIMO technology. In addition, 100 GHz-band system-level performances are shown by developed 6G simulator assuming multiple base stations and mobile stations in a future factory environment.