Sadayuki Abeta received a Ph.D. degree in electrical communication engineering from Osaka University in 1997. He has been with NTT DOCOMO, INC from 1997, where he is currently a General Manager of the Radio Access Network Development Department. He is responsible for the development of LTE, 5G, X-haul and satellite communications. He has been working for research, standardization and development of the UMTS/W-CDMA, HPSA, LTE, LTE-Advanced and 5G. From 2005 to 2009, he was a vice chairman of 3GPP TSG-RAN WG1 and rapporteur of LTE and LTE-Advanced in 3GPP TSG RAN WG1.