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Friday, 1 June 2018, 14:07 HKT/SGT
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Source: NTT DOCOMO / NEC Corporation
DOCOMO and NEC Achieve 5G Communication with Multiple Mobile Terminals
By Reducing Interference via Beamforming and Inter-base Station Coordination

TOKYO, June 1, 2018 - (JCN Newswire) - NTT DOCOMO, INC. today announced that together with NEC Corporation they have succeeded in what is believed to be the world's first(1) fifth-generation (5G) transmission of a 4.5GHz signal using beamforming and inter-base station coordination to reduce interference for 5.5 Gbps throughput to eight mobile terminals.

The test, conducted in Kawasaki, Japan from May 9 to 11, used digital signal processing between base stations, which were equipped with signal processing units and massive-element antennas, to coordinate beamforming between base stations. Simultaneously, 5G communication with eight mobile terminals was achieved.

The test verified the feasibility of beam forming through coordination of small, optical-feeder-type base stations equipped with 128-element antennas and digital signal processing units, which were connected via optical fiber. Antennas of adjacent base stations sometimes cause large interference and reduce data rate, but this test used beamforming and digital signal processing to mutually cancel out interference. The solution will enable multiple antennas to be installed more flexibly for higher-capacity 5G communications in dense urban areas.

DOCOMO and NEC achieved their test goals for 5G research and development projects commissioned by The Ministry of Internal Affairs and Communications, Japan, including "high data rate and low-power-consumption radio access technology with ultra higher-frequency-bands and wider-bandwidth massive-element antennas." They introduced their test results and other 5G initiatives at the 5G Tokyo Bay Summit held during Wireless Technology Park 2018, which was held at Tokyo Big Sight from May 23 to 25.

Some of the test results include a portion of the results from "The research and development project for realization of the fifth-generation mobile communications system" commissioned by The Ministry of Internal Affairs and Communications, Japan.

(1) According to NTT DOCOMO and NEC as of May 23, 2018


About NTT DOCOMO

NTT DOCOMO, Japan's leading mobile operator with over 77 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 and work. 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). https://www.nttdocomo.co.jp/english/.

About NEC Corporation

NEC Corporation is a leader in the integration of IT and network technologies that benefit businesses and people around the world. The NEC Group globally provides "Solutions for Society" that promote the safety, security efficiency and fairness of society. Under the company's corporate message of "Orchestrating a brighter world," NEC aims to help solve a wide range of challenging issues and to create new social value for the changing world of tomorrow. For more information, visit NEC at https://www.nec.com.

Contact:
NTT DOCOMO
International PR
Public Relations Department
Tel: +81-3-5156-1366    
Fax: +81-3-5501-3408
URL: www.nttdocomo.com
Contact: https://nes.nttdocomo.co.jp/PINQ01/showinquiry.do

NEC
Seiichiro Toda        
s-toda@cj.jp.nec.com
+81-3-3798-6511


June 1, 2018 14:07 HKT/SGT
Source: NTT DOCOMO / NEC Corporation

NTT DOCOMO (TSE: 9437)
NEC Corporation (TSE: 6701)

Topic: Press release summary
Sectors: Mobility/Wireless
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