Sadayuki Abeta received the B.E., M.E. and Ph.D. degrees in electrical communication engineering from Osaka University, Osaka, Japan, in 1993, 1995, and 1997 respectively. He has been with NTT DOCOMO, INC from 1997, where he is currently a Director of the radio system group and radio network system group in the radio access network development department. He has been working for research, standardization and development of the UMTS/W-CDMA, HPSA, LTE and LTE-Advanced. He also works for the performance optimization and cell planning for commercial LTE network. From June 2000 to May 2001, he was a visiting researcher in Princeton University. 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.