February 21, 2014

DOCOMO's Field-tested Active Antenna System Promises Wider Base Station Coverage

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R&D

TOKYO, JAPAN, February 21, 2014 --- NTT DOCOMO, INC., a personalized mobile solutions provider for smarter living, announced today Japan's first field test of an active antenna system for mobile networks in which a 4 dB reduction in electrical loss compared to conventional antennas was demonstrated, a key development in power efficiency that promises someday to help enlarge the coverage range of base stations 1.7-fold.

The active antenna system for the field test was developed by Tokyo-based Nihon Dengyo Kosaku Co., Ltd. By demonstrating the active antenna system's capability to expand a base station's range of coverage, the field test points to the potential for more extensive mobile service in rural areas and faster recovery when rebuilding network infrastructure damaged by a natural disaster.

The new antenna integrates multiple antenna elements, each equipped with a small transceiver, which enables installment in confined spaces and assures continued coverage if one or more of the transceivers fails. Also, whereas electrical loss occurs in the connection between a separately located remote radio head (RRH) and a conventional antenna, as well as within the conventional antenna itself, integrating an RRH with each antenna element will result in more efficient operation.

Further, the active antenna system's compatibility with MIMO transmission technology should help to raise efficiency when deploying LTE-Advanced, and later 5G, network technologies.

About NTT DOCOMO

NTT DOCOMO provides innovative, convenient and secure mobile services that enable smarter living for each customer. The company serves over 62 million mobile customers in Japan via advanced wireless networks, including a nationwide 3G network and one of the world's first commercial LTE networks. Leveraging its unique capabilities as a mobile operator, DOCOMO is a leading developer of cutting-edge technologies for NFC mobile payments, mobile GPS, mobile TV, intuitive mobile assistance, environmental monitoring, smart grids and much more. Overseas, the company provides technical and operational expertise to eight mobile operators and other partner companies. NTT DOCOMO is listed on the Tokyo (9437), London (NDCM) and New York (DCM) stock exchanges. Please visit https://www.nttdocomo.co.jp/english/ for more information.

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