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tions experiments; land-based mobile communications experiments; and high-speed data transmission protocol experiments.Many companies, universities, and other bodies are engaged in a wide range of technology development initia-tives focused on 5G and IoT, so various technologies are expected to appear in due course. As well as working in partnership with these stakeholders to promote the utiliza-tion of 5G and IoT, NICT intends to conduct long-term research and development that looks even further into the future. In closing, I would like to express my gratitude to the Ministry of Internal Aairs and Communications, JAXA, and the many companies, universities, and other relevant organizations that provided cooperation and sup-port in the course of the research and development of the diverse technologies showcased in this special issue, with-out whose assistance we would have been unable to achieve these results.Naoto KADOWAKI, Ph.D.Vice President, National Institute of Information and Communications TechnologySatellite communications, Wireless communications1 Introduction: Special Issue on Terrestrial Communication Technology and Ultra-High-Speed Satellite Communications Technology2　　　Journal of the National Institute of Information and Communications Technology Vol. 64 No. 2 (2017)