1. Ministry of Internal Affairs and Communications, “Publication of Status of 5G Development (at the end of FY2022),” Aug. 3, 2023.
https://www.soumu.go.jp/main_sosiki/joho_tsusin/eng/pressrelease/2023/8/3_1.html
2. Press release issued by NTT and NTT DOCOMO, “NTT DOCOMO and NTT to Collaborate on 6G Experimental Trials with World-leading Mobile Technology Vendors - Leading the World in Research and Development for Commercial Launch of 5G Evolution & 6G powered by IOWN -,” June 6, 2022.
https://group.ntt/en/newsrelease/2022/06/06/220606a.html
3. NTT DOCOMO, “DOCOMO 6G White Paper,”
https://www.docomo.ne.jp/english/corporate/technology/whitepaper_6g/
4. Press release issued by NTT, “World’s First Successful 1.4-Tbit/s Wireless Transmission in the Sub-THz Band - Contributing to the Creation of New Wireless Services Enabled by IOWN and 6G -,” Mar. 30, 2023.
https://group.ntt/en/newsrelease/2023/03/30/230330a.html
5. H. Sasaki, Y. Yagi, R. Kudo, and D. Lee, “1.58 Tbps OAM Multiplexing Wireless Transmission with Wideband Butler Matrix for Sub-THz Band,” IEEE J. Sel. Areas Commun., Vol. 42, No. 6, pp. 1613–1625, Apr. 2024.
https://doi.org/10.1109/JSAC.2024.3389125