| 2025 | VTC | Application-Level E2E Demonstration of Reducing Uplink Jitter Due to Radio Transmission Toward Real-Time and Stable Remote Operation. | Kenji Miyamoto, Takumi Harada, Hirotaka Ujikawa, Tatsuya Shimada, Tomoaki Yoshida |
| 2017 | GLOBECOM | Efficient DWBA Algorithm for TWDM-PON with Mobile Fronthaul in 5G Networks. | Yu Nakayama, Hiroyuki Uzawa, Daisuke Hisano, Hirotaka Ujikawa, Hirotaka Nakamura, Jun Terada, Akihiro Otaka |
| 2017 | SOFTCOM | Dynamic software updating of OLTs without service interruption. | Takumi Harada, Hirotaka Ujikawa, Manabu Yoshino, Noriyuki Oota, Ken-Ichi Suzuki, Akihiro Otaka |
| 2016 | GLOBECOM | QoE-Guaranteed and Sustainable User Position Guidance for Post-Disaster Cloud Radio Access Network. | Katsuya Suto, Tiago Gama Rodrigues, Hiroki Nishiyama, Nei Kato, Hirotaka Ujikawa, Ken-Ichi Suzuki |
| 2014 | VTC | Synchronized Power Saving Mechanisms for Battery-Powered Mobile Terminals in Smart FiWi Networks. | Keisuke Miyanabe, Hiroki Nishiyama, Nei Kato, Hirotaka Ujikawa, Ken-Ichi Suzuki, Naoto Yoshimoto |
| 2013 | GLOBECOM | Demonstration of timer-based ONU deep sleep for emergency communication during power failure. | Hirotaka Ujikawa, Takashi Yamada, Naoto Yoshimoto |
| 2012 | APCC | ONU sleep control by HGW considering users' traffic distribution for energy-aware access networks. | Hiroko Nomura, Susumu Nishihara, Hirotaka Ujikawa, Masashi Tadokoro, Takashi Yamada, Naoto Yoshimoto |
| 2012 | PIMRC | A bandwidth allocation method to improve user QoS satisfaction without decreasing system throughput in wireless access networks. | Kenta Suzuki, Hiroki Nishiyama, Nei Kato, Hirotaka Ujikawa, Ken-Ichi Suzuki, Naoto Yoshimoto |
| 2011 | APCC | Multilevel dynamic bandwidth allocation using buffer observation for cousin-fair access systems. | Hirotaka Ujikawa, Takeshi Sakamoto, Naoto Yoshimoto, Hisaya Hadama |