Performance improvements in digital portable communications. - Narumi Umeda; Mitsuru Murata (ISCAS, 1993)

Capacity Design and Performance of Call Admission Control in Cellular CDMA Systems. - Yoshihiro Ishikawa; Narumi Umeda (IEEE J. Sel. Areas Commun., 1997)

System architecture for mobile communications systems beyond IMT-2000. - Toru Otsu; Narumi Umeda; Yasushi Yamao (GLOBECOM, 2001)

Architecture and Mobile IPv6 extensions supporting mobile networks in mobile communications. - Ichiro Okajima; Narumi Umeda; Yasushi Yamao (VTC Fall, 2001)

Network architecture for mobile communications systems beyond IMT-2000. - Toru Otsu; Ichiro Okajima; Narumi Umeda; Yasushi Yamao (IEEE Wirel. Commun., 2001)

Downlink packet-scheduling considering transmission power and QoS in CDMA packet cellular systems. - Daisuke Kitazawa; Lan Chen; Hidetoshi Kayama; Narumi Umeda (MWCN, 2002)

VoIP Quality Evaluation in Mobile Wireless Networks. - Pei-Jeng Kuo; Koji Omae; Ichiro Okajima; Narumi Umeda (IEEE Pacific Rim Conference on Multimedia, 2002)

Power resource cooperation control considering wireless QoS for CDMA packet mobile communication systems. - Lan Chen; Hidetoshi Kayama; Narumi Umeda (PIMRC, 2002)

Wireless QoS architecture and resource management for CDMA packet access multimedia cellular radio. - Lan Chen; Hidetoshi Kayama; Narumi Umeda; Yasushi Yamao (PIMRC, 2002)

Handoff performance of mobile host and mobile router employing HMIP extension. - Koji Omae; Masahiro Inoue; Ichiro Okajima; Narumi Umeda (WCNC, 2003)

Wireless QoS-Aware Resource Management for CDMA Packet Multimedia Cellular Radio. - Lan Chen; Hidetoshi Kayama; Narumi Umeda; Yasushi Yamao (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2003)

Mobility anchor point discovery protocol for hierarchical mobile IPv6. - Koji Omae; Ichiro Okajima; Narumi Umeda (WCNC, 2004)

Evaluation of Cell Coverage and System Throughput in Multihop DS-CDMA Cellular Network. - Atsushi Fujiwara; Shinji Takeda; Hitoshi Yoshino; Narumi Umeda (IEICE Trans. Commun., 2005)

Intra-Cell Allocation Information and Inter-Cell Interference Distribution Based TPC for High-Speed CDMA Packet Radio. - Heng Qiu; Hidetoshi Kayama; Narumi Umeda (IEICE Trans. Commun., 2005)

Wireless QoS for High-Speed CDMA Packet Cellular Systems - With Radio-Condition-Aware Admission Control and Resource Allocation Reflected Multistage Scheduling - . - Narumi Umeda; Lan Chen; Hidetoshi Kayama (IEICE Trans. Commun., 2006)