December 1, 2016 — NTT DoCoMo and Samsung achieved data speeds of 2.5 Gbps in a trial that used a mobile device in a vehicle travelling more than 90 miles an hour. The 5G test, which used 28 GHz band frequencies, proved the feasibility of stable connectivity for 5G mobile devices in fast-moving trains.
The trial, which took place on Nov. 7 at the Fuji Speedway, used massive multiple-input multiple-output (MIMO) technologies that incorporate beamforming, which adjusts the beam according to the fast-moving mobile device’s location.
Separately, DoCoMo conducted an outdoor trial with Huawei involving 23 simultaneously connected mobile devices that achieved a cumulative 11.29 Gbps of data throughput and latency below 0.5 milliseconds using the 4.5 GHz frequency band.
The trial combined multi-user MIMO (MU-MIMO) technology with a precoding algorithm that optimizes signals for maximized performance and also limits inter-user interference.
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.