Successful Demonstration of Stable High-Capacity Millimeter-Wave Communication for Multiple High-Speed Moving Vehicles Aiming for the 6G Era
NTT Docomo, NEC, and NTT have developed 6G-era millimeter-wave communication technology. By using distributed MIMO and pre-correction techniques, they achieved stable high-capacity communication between multiple high-speed moving vehicles, increasing throughput by approximately 1.3 times.
📋 Article Processing Timeline
- 📰 Published: May 25, 2026 at 20:22
- 🔍 Collected: May 25, 2026 at 12:01
- 🤖 AI Analyzed: May 25, 2026 at 12:23 (21 min after Collected)
NTT Docomo, Inc. (Docomo) and NEC Corporation (NEC), in collaboration with NTT Corporation (NTT), have developed technology to realize stable, simultaneous communication for multiple high-speed moving vehicles utilizing high-capacity millimeter-wave (40GHz band) communication expected for the 6G era.
This technology utilizes distributed MIMO, which places multiple antennas from a base station at different locations, combined with pre-correction of signal transmission frequency and timing. In demonstration experiments conducted in March 2026, multiple wireless terminal vehicles traveling at high speeds in opposite lanes maintained stable high throughput, successfully improving average throughput by approximately 1.3 times compared to conventional technology.
[Features of the Technology]
This technology uses uplink reference signals sent from each wireless terminal vehicle for every base station antenna to pre-estimate the appropriate transmission frequency and signal transmission timing for each vehicle. By pre-correcting multiplexed signals for each vehicle before synthesis and transmission, it eliminates differences in reception timing among multiple vehicles, realizing stable high-capacity communication.
[Future Developments]
This demonstration proved that high-capacity communication using millimeter waves is possible even in environments where multiple automobiles or trains are moving at high speeds. Development will now be accelerated toward the social implementation of 6G-related technologies.
This technology utilizes distributed MIMO, which places multiple antennas from a base station at different locations, combined with pre-correction of signal transmission frequency and timing. In demonstration experiments conducted in March 2026, multiple wireless terminal vehicles traveling at high speeds in opposite lanes maintained stable high throughput, successfully improving average throughput by approximately 1.3 times compared to conventional technology.
[Features of the Technology]
This technology uses uplink reference signals sent from each wireless terminal vehicle for every base station antenna to pre-estimate the appropriate transmission frequency and signal transmission timing for each vehicle. By pre-correcting multiplexed signals for each vehicle before synthesis and transmission, it eliminates differences in reception timing among multiple vehicles, realizing stable high-capacity communication.
[Future Developments]
This demonstration proved that high-capacity communication using millimeter waves is possible even in environments where multiple automobiles or trains are moving at high speeds. Development will now be accelerated toward the social implementation of 6G-related technologies.
FAQ
開発された技術の主な特徴は何ですか？
基地局から複数のアンテナを分散配置する分散MIMO技術に加え、信号の送信周波数と送信タイミングを事前補正する技術を組み合わせることで、高速移動車両の通信品質を安定させます。
実証実験の結果、どのような効果が確認されましたか？
対向車線を高速で走行する複数車両において、アンテナ切り替え時のスループット低下を抑制し、平均スループットが従来比で約1.3倍向上しました。
この技術が活用される分野はどこですか？
6G時代の社会実装に向けて、ミリ波を活用した自動運転の実現や、高速移動車両内での体験価値向上などが想定されています。
実験はどのような場所で行われましたか？
2026年3月に、国土交通省 国土技術政策総合研究所内に設置された実大トンネル型の実験施設で実施されました。
なぜ高速移動中にミリ波通信は不安定になるのですか？
基地局の切り替えが頻繁に発生し、電波のドップラー周波数や伝搬遅延が急激に変化するためです。