成功實證在JR山手線列車內建構5G（毫米波）網路區域

KDDI與JR東日本成功完成一項在山手線列車內建構5G毫米波網路的實證。透過安裝在車窗上的玻璃天線接收信號並在車內重新發射，能夠達到1Gbps速度的通訊區域從車廂的40%大幅提升至97%。
Technology DemonstrationNQ 96/100出典：PR Times

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  • 📰 發表: 2026年5月20日 23:00
  • 🔍 收集: 2026年5月20日 14:31
  • 🤖 AI分析完成: 2026年5月22日 14:04（收集後47小時32分鐘）
KDDI株式會社與東日本旅客鐵道株式會社（JR東日本）宣布，成功在JR山手線列車內擴展5G（毫米波）網路區域的實證。此項日本國內首創的技術，是利用安裝在車窗上的玻璃天線接收來自軌道旁基地台的毫米波信號，經放大後再重新輻射至車廂內部。由於金屬車體容易阻擋電波，此新架構確認能將可達到1Gbps通訊速度的區域，從車廂整體的約40%飛躍性地提升至約97%。此實證在AGC、日本電業工作、京瓷等公司的協力下完成。兩家公司未來將利用此成果，致力於提升通訊品質與乘客便利性。

常見問題

What was the main achievement of this demonstration?

The successful creation of a stable, high-speed 5G millimeter-wave (mmWave) communication area inside a JR Yamanote Line train car, a challenging environment due to the signal-blocking metal structure.

How did the technology bring the 5G signal into the train?

It used a mmWave-compatible glass antenna on the train's window to receive the signal from a trackside base station. The signal was then amplified and re-radiated throughout the car using a dielectric waveguide and other antennas.

By how much did the 5G coverage inside the train improve?

The communication area capable of achieving speeds of 1Gbps was improved from approximately 40% of the vehicle to about 97%.

Which companies were involved in this project?

The demonstration was led by KDDI and JR East, with technological cooperation from AGC, Nippon Dengyo Kosaku, and Kyocera.

Why is it difficult to get a 5G mmWave signal inside a train?

5G mmWave signals have high directivity and are easily blocked by obstacles. The metal body of a train car acts as a shield, making it very difficult for the signal to penetrate from the outside.

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