NTT DOCOMO runs 5G tests with Samsung and Huawei

NTT DOCOMO announced that in a joint trial of 5G technologies with Samsung Electronics Co, it has successfully achieved a data speed of more than 2.5Gbps with a mobile device that was in a vehicle traveling 150km/h, thereby verifying the feasibility of stable connectivity for 5G mobile devices in fast-moving trains.

The trial took place on November 7 in Fuji Speedway, a motorsport racing circuit in Shizuoka Prefecture, Japan. Transmissions were conducted using the 28GHz high-frequency band, one of the candidate bands that the Ministry of Internal Affairs and Communications is considering to designate for commercial 5G networks in Japan.

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To date, no test had achieved a successful wireless data transmission to a fast-moving device due to the large path-loss of high-frequency radio signals. In this trial, however, the problem was overcome with massive multiple-input multiple-output (MIMO) technologies that incorporate beamforming, which concentrates radio waves in a specific direction, and beam tracking, which adjusts the beam according to the fast-moving mobile device’s location.

In a separate undertaking, NTT DOCOMO conducted an outdoor data-transmission trial with Huawei from October 3 to 26. It was carried out in a field measuring 100,000 square meters, equivalent to 12 soccer pitches, in the Minato Mirai 21 waterfront of Yokohama. The trial involved 23 simultaneously connected mobile devices and achieved a cumulative 11.29Gbps of data throughput and latency below 0.5 seconds using the 4.5GHz frequency band.

Going forward, DOCOMO will continue research and development collaboration with world-leading vendors in support of its planned launch of a commercial 5G mobile communications system by 2020.

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