TOKYO, Japan, September 18, 2026 – (JCN Newswire) –KDDI Corporation, NTT DOCOMO, INC., SoftBank Corp., and Rakuten Mobile, Inc. revealed today that they signed a memorandum of understanding (MoU) on September 11, 2026, to release a joint research study on using 5G millimeter-wave * 1 facilities and technical architectures to broaden protection.
While millimeter-wave spectrum allows ultra-high-speed, high-capacity information transmission, its proliferation qualities make signals prone to attenuation and blockage by physical challenges. Broadening millimeter-wave protection needs the advancement of a big number of base stations and associated devices, making fast protection growth an industry-wide difficulty for telecommunication operators.Based on the property that each operator will continue its own millimeter-wave release, this effort intends to provide top quality millimeter-wave experiences to more consumers through cross-operator partnership.
Summary of the Joint Study
Through this research study, the business will evaluate the technical expediency of broadening the use protection of 5G millimeter-wave base stations amongst mobile network operators and examine effective functional structures for its execution. To attain this growth through partnership amongst mobile network operators, this research study will concentrate on innovations and methods associated with 5G millimeter-wave base stations, repeaters, and other associated properties. While each operator actively releases its own 5G millimeter-wave devices, the business will pursue concrete research studies to successfully make use of released centers.
Moving forward, the business will continue working to broaden Japan’s 5G millimeter-wave facilities and offer top quality, smooth connection to a broader variety of clients, thus adding to the development of Japan’s digital facilities.
* 1 28GHz frequency band
About KDDI
KDDI is a leading Japanese telecoms business with over 100 million consumers. In the last few years, KDDI has actually broadened beyond its core telecom organization into locations such as AI, financing, energy, retail, and cybersecurity, adding to structural reforms throughout numerous markets. Internationally, KDDI supplies mobile services, IoT services for linked automobiles, and information center connection, mostly in North America, Europe, and Asia. KDDI is driving social effect and improvement through its mid-term management method, “Power-to-Connect 2028.” To find out more, check out the KDDI site. https://www.kddi.com/english/
About NTT DOCOMO
NTT DOCOMO, Japan’s leading mobile operator with over 91 million customers, is among the worldwide leaders in 3G, 4G and 5G mobile network innovations. Under the motto “Bridging Worlds for Wonder & & Happiness, “DOCOMO is actively teaming up with worldwide partners to broaden its company scope from mobile services to detailed services, intending to provide unmatched worth and drive development in innovation and interactions, eventually to support favorable modification and improvement in international society. https://www.docomo.ne.jp/english/
About SoftBank Corp.
Assisted by the SoftBank Group’s business viewpoint, “Information Revolution – Happiness for everybody,” SoftBank Corp. (TOKYO: 9434) runs telecoms and IT organizations in Japan and worldwide. Structure on its strong organization structure, SoftBank Corp. is intending to trigger the capacity of AI throughout its organizations and drive execution in line with its “Activate AI for Society” development method. While more growing its telecom service, SoftBank is broadening its AI computing facilities and AI and Cloud service companies with the objective of ending up being a supplier of Next-generation Social Infrastructure. To get more information, please go to https://www.softbank.jp/en/corp/
About Rakuten Mobile
Rakuten Mobile, Inc. is a Rakuten Group business accountable for mobile interactions, fixated its mobile network operator (MNO) company. Through constant development and the implementation of sophisticated innovation, Rakuten Mobile intends to redefine expectations in the mobile interactions market in order to offer enticing and practical services for varied consumer requirements.
* Product and service names discussed in this release are typically hallmarks or signed up hallmarks of their particular business. Hallmark signs such as TM and ® might be left out in this release.
Subject: Press release summary