JR山手線の車両内を5G（ミリ波）エリア化する実証に成功

⚡ 3行で分かる（要点）

• KDDI and JR East, in partnership with AGC, Nippon Dengyo Kosaku, and Kyocera, have successfully demonstrated a novel system to provide 5G millimeter-wave coverage within a JR Yamanote Line train.
• The system, a first in Japan, uses a window-mounted glass antenna to capture external signals, which are then amplified and re-radiated inside the car.
• This method dramatically increased the 1Gbps-capable communication area from 40% to 97%, solving the issue of signal blockage by the train's metal body.