Junichiro Hagiwara
Hokkaido University
46 Papers
284 Citations
Junichiro Hagiwara is an academic researcher from Hokkaido University. The author has contributed to research in topics: Base station & MIMO. The author has an hindex of 8, co-authored 46 publications. Previous affiliations of Junichiro Hagiwara include Southeast University & NTT DoCoMo.
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Papers
Patent
Base station apparatus of mobile communication system
Takehiro Nakamura,Junichiro Hagiwara,Etsuhiro Nakano,Koji Ohno,Seizo Onoe,Akihiro Higashi,Motoshi Tamura,Masatomo Nakano,Hiroshi Kawakami,Hiroki Morikawa +9 more
- 29 Sep 2003
TL;DR: In this article, a base station including a transmitting and receiving amplifier for amplifying CDMA signals exchanged with a mobile station, a radio stage connected to the transmitting and receive amplifier for carrying out D/A conversion of a transmitted signal that undergoes baseband spreading, followed by quadrature modulation, and for detecting a received signal, then A/D conversion, and a transmission interface connected with the baseband signal processor for implementing interface with external channels.
136
Investigation on Mobility Management for Carrier Aggregation in LTE-Advanced
Kengo Yagyu,Takeshi Nakamori,Hiroyuki Ishii,Mikio Iwamura,Nobuhiko Miki,Takahiro Asai,Junichiro Hagiwara +6 more
- 01 Dec 2011
TL;DR: This paper presents evaluation results on the CC control overhead with several CC management policies in some CA deployment scenarios, and shows that the increase in the control overhead is not significant even in a CA deployment scenario with overlaid picocells.
28
Patent
Radio communication system
Hiroto Yasuda,Yasufumi Morioka,Jinho Kim,Hideaki Takahashi,Junichiro Hagiwara,Hiroyuki Ishii +5 more
- 30 May 2019
TL;DR: In this article, a radio communication system with a state management unit that manages a communication state of the user equipment and a state transition unit that causes it to transition from a connected state to a sustained state is described.
24
Spatial channel emulator for MIMO performance evaluation of mobile terminals
Tetsuro Imai,Yoshiki Okano,Koshiro Kitao,Kentaro Saito,Junichiro Hagiwara +4 more
- 01 Dec 2009
TL;DR: In this article, the basic configuration for the spatial channel emulator was clarified and a theoretical criterion for the array configuration of probe antennas in the radiation part of the emulator was proposed, taking into account the MIMO channel model.
18
Patent
Wireless communication system
Yasufumi Morioka,Hiroto Yasuda,Jinho Kim,Hideaki Takahashi,Junichiro Hagiwara,Hiroyuki Ishii +5 more
- 15 May 2013
TL;DR: In this paper, a radio communication system has a user equipment, a first base station, a second base station and a serving gateway, and a switching station, where a path setting determiner determines whether to set a user-plane path, based on measurement information reported from the user equipment.
15