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16 November 2016
| James Pearce
NTT DoCoMo and Samsung have trialled 5G technologies on a high-speed vehicle, hitting data speeds of more than 2.5Gbps.
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
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
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."