Mitsubishi Electric Corporation
NTT DOCOMO, INC.

Mitsubishi Electric and NTT DOCOMO Achieve World’s First 27Gbps
Throughput in 5G Outdoor Trials
World’s first 5G transmission to mobile terminal exceeding peak data rate of 20Gbps
TOKYO, November 22, 2018 – Mitsubishi Electric Corporation (TOKYO: 6503) and NTT DOCOMO, INC.
(TOKYO: 9437) announced today that they have achieved what they believe to be the world's first (as of today)
fifth-generation (5G) mobile telecommunications proof of concept for 27Gbps and 25Gbps maximum
throughputs via one mobile terminal over communication distances of 10m and 100m, respectively, using the28GHz radio frequency. The demonstration was conducted during joint outdoor field trials using 28GHz-band
massive-element antenna systems and 16-beam spatial-multiplexing technology with 500MHz bandwidth. The
trial took place in Kamakura, Kanagawa Prefecture Japan from September 10 to 28, 2018.

Outdoor trial (10 meters between base station and mobile terminal)
Key Features- For outdoor trials using the 28GHz band, Mitsubishi Electric used an antenna system with 16-beamspatial-multiplexing technology1. Base-station antennas installed on the wall of a building directedbeams to mobile-terminal antennas installed on the rooftop of a vehicle.
- The trial was the world's first successful wireless downlink transmission at maximum data rates of27Gbps and 25Gbps for per one mobile terminal when the communication distance was 10m and 100m,respectively.
1 Mitsubishi Electric announced on February 14, 2018 that it had developed 16-beam spatial-multiplexing technology consistingof eight analog, front-end processing, low-power units to form 16 beams and a multiple-input multiple-output (MIMO) digitalprocessing algorithm to reduce inter-beam interference. www.MitsubishiElectric.co.jp/news/2018/0214-e.html

1/5Overview

5GConventional(4G)Features
500MHz bandwidth,
16 x 16 MIMO2 transmission
60MHz bandwidth,4 x 4 MIMO transmission

Maximum throughput
27Gbps at 10 meters and25Gbps at 100 meters
988Mbps3

2 Multiple-Input Multiple-Output
3 Fastest 4G mobile communication system in Japan as of November 2018

Future work
Indoor trials using 28GHz band in multipath-rich environments during fiscal year ending March 31, 2019.
BackgroundA peak data rate of 20Gbps is required for 5G mobile communications. One technology that promise to meetthis need is massive-element antenna systems technology, which enables multi-beam spatial multiplexing
where multiple data streams can be transmitted in parallel to mobile terminals. Realizing this technology,
however, has involved two challenges: implementation of a massive-element antenna array that clusters large
numbers of antenna elements for high-precision beamforming, and mitigation of inter-beam interference.
Mitsubishi Electric and DOCOMO have jointly undertaken "The research and development project forrealization of the fifth-generation mobile communications system − High data rate and low-powerconsumption radio access technologies with higher-frequency-band and wider-bandwidth massive MIMO"
commissioned by Japan's Ministry of Internal Affairs and Communications. The focus of their research has
been wideband massive MIMO and beam-control technologies for high SHF bands. To realize 20Gbps
throughput using 500MHz bandwidth, they have now collaboratively developed and validated a massiveelement antenna system enabling 16-beam spatial multiplexing.
Using 4G systems, it has not been possible to establish high data-rate communication for a single mobile
terminal using more than four streams. Mitsubishi Electric and DOCOMO carried out 28GHz-band outdoor
field trials to verify the feasibility of 16-beam spatial multiplexing in line-of-sight conditions4, where massiveelement base-station antennas installed on the wall of a building directed beams to mobile-terminal antennas
installed on the rooftop of a vehicle. The mobile terminal moved along two different streets. The distance of
one mobile terminal was 10m from the base station and the distance for the other was 100m (Fig. 1).
4 There was no obstacle between the base station and device. The environment for parallel transmission was challenging.

This news release includes a part of “The research and development project for realization of the fifth
generation mobile communications system” commissioned by Japan’s Ministry of Internal Affairs andCommunications.

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Details
Conventional 4G spatial multiplexing technology has limited multiplexing order, so Mitsubishi Electric andDOCOMO developed beamforming technology in an analog domain and inter-beam interference reduction
technology to suitably separate overlapping beams with digital signal processing at the base station. The result
is 16-beam spatial multiplexing, which has been unachievable with 4G.
The developed beamforming technology enables beams to track a mobile terminal by switching the preset
beam (Fig. 2). The inter-beam interference reduction technology estimates the channel at the base station andcontrols the transmitting signal to adaptively reduce inter-beam interference as channel conditions over time.
Together, the two technologies enable 16-beam spatial multiplexing in outdoor mobile environments.
The trials achieved the world's first successful wireless downlink transmissions at data rates of 27Gbps and25Gbps when the distance between the base station and the mobile terminal was 10m and 100m, respectively.
The achieved peak data rates correspond to spectral efficiency of 67bps/Hz4, believed to be the world’s best
performance for 28GHz-band mobile telecommunication.
The test achieved the goal of the Japanese government’s research and development project to help realize 5G
mobile communications based on high data-rate and low-power-consumption radio-access technologies andusing an ultra-high-frequency band and extra-wide-bandwidth massive MIMO. The developed technologies
are expected to enable wireless communications at ultra-high data rates of more than 20Gbps to moving
vehicles with numerous passengers, such as buses.
4 Downlink occupancy is 80% of TDD frame, i.e. downlink : uplink = 4 :1

Fig. 1 Outdoor trial site and throughput results according to position of mobile terminal

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Fig. 2 Tracking mobile terminal by beam switching (viewed from base station)

Table 1 Outdoor Trial Parameters
Period of the trial: September 10 to 28, 2018
GeneralLocation: Kamakura, Kanagawa Prefecture, Japan
Radio frequency: 28GHz-band (bandwidth: 500MHz)・Massive-element antenna：maximum 256-element phased array antenna x 16Base station(4096 elements)
・Number of data streams: 16Terminal
・Terminal antenna: patch antenna x 8 x 2 polarization
Table 2 Roles of Trial Participants
Mitsubishi Electric
DOCOMO・Development and supply of 28GHz trial system
・Operation of outdoor trial
・Determination of specifications for 28GHz trial system
・Planning of driving trial

Media Inquiries
Mitsubishi Electric Corporation
Mr. Niels Meinke
Public Relations Division
Email: prd.gnews@nk.MitsubishiElectric.co.jp
Tel: +81-3-3218-2831
Fax: +81-3-3218-2431
Website: www.MitsubishiElectric.com
NTT DOCOMO, INC.
Ms. Makiko Furuta or Mr. Michael Bristow
Public Relations Department
Tel: +81-3-5156-1366
Fax: +81-3-5501-3408
Website: www.nttdocomo.co.jp/english

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###About Mitsubishi Electric Corporation
With nearly 100 years of experience in providing reliable, high-quality products, Mitsubishi Electric
Corporation (TOKYO: 6503) is a recognized world leader in the manufacture, marketing and sales of electricaland electronic equipment used in information processing and communications, space development and satellite
communications, consumer electronics, industrial technology, energy, transportation and building equipment.
Embracing the spirit of its corporate statement, Changes for the Better, and its environmental statement, EcoChanges, Mitsubishi Electric endeavors to be a global, leading green company, enriching society withtechnology. The company recorded consolidated group sales of 4,444.4 billion yen (in accordance with IFRS;
US$ 41.9 billion*) in the fiscal year ended March 31, 2018. For more information visit:
www.MitsubishiElectric.com*At an exchange rate of 106 yen to the US dollar, the rate given by the Tokyo Foreign Exchange Market on
March 31, 2018

About NTT DOCOMONTT DOCOMO, Japan's leading mobile operator with over 76 million subscriptions, is one of the world's
foremost contributors to 3G, 4G and 5G mobile network technologies. Beyond core communications
services, DOCOMO is challenging new frontiers in collaboration with a growing number of entities ("+d"partners), creating exciting and convenient value-added services that change the way people live andwork. Under a medium-term plan toward 2020 and beyond, DOCOMO is pioneering a leading-edge 5G
network to facilitate innovative services that will amaze and inspire customers beyond their expectations.
DOCOMO is listed on the Tokyo Stock Exchange (9437). www.nttdocomo.co.jp/english.

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