The trial took place at Fuji Speedway in Shizuoka Prefecture, Japan, on 7 November, and were conducted using the 28GHz high frequency band.
It used multiple input and multiple output (MIMO) technology incorporating both beamforming, which concentrates radio waves, and beam tracking, which adjusts the spectrum beam depending on the location of the mobile device.
Previous tests on fast-moving vehicles had encountered problems with path-loss of high-frequency radio signals, the Japanese operator said, but the MIMO technology helped overcome this, verifying the feasibility of stable 5G connectivity in fast-moving trains.
DoCoMo also carried out 5G tests as part of a separate outdoor data-transmission trial with Huawei. In this trial, the two firms connected 23 mobile devices simultaneously to achieve a cumulative 11.29Gbps of data throughput.
The test was carried out on the 4.5GHz spectrum band with multi-user MIMO applied. Latency was below 0.5 seconds during the test.
NTT DoCoMo said: “The successful outcomes of these trials will be exhibited at DOCOMO R&D Open House 2016 at the DoCoMo R&D Center in the Yokosuka Research Park near Yokohama, Japan on November 17 and 18.
“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.”
