TOKYO, Japan, September 18, 2026 – (JCN Newswire) – KDDI Corporation, NTT DOCOMO, INC., SoftBank Corp., and Rakuten Mobile, Inc. announced today that they signed a memorandum of understanding (MoU) on September 11, 2026, to launch a joint study on utilizing 5G millimeter-wave*1 infrastructure and technical architectures to expand coverage.While millimeter-wave spectrum enables ultra-high-speed…
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