Shinobu Nanba

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Mobile data traffic has been increasing at a rapid pace over the past few years due to the rise of both smartphones and tablets. To accommodate such a huge traffic volume in cellular systems, it is imperative to reduce cell size to increase system capacity. To reduce cell size, the main issue confronting mobile network operators is system cost to provide(More)
Triggered by the explosion of mobile traffic, 5G cellular network requires evolution to increase the system rate 1000 times higher than the current systems in 10 years. Motivated by this common problem, this paper studies to integrate mm-wave access into current cellular networks as multi-band heterogeneous networks to exploit the ultrawideband aspect of(More)
Mobile data traffic has been increasing at a rapid pace over the past few years due to the rise of both smartphones and tablets. Small cell deployments are one of the most effective ways to increase system capacity by improving the spatial reuse of radio resources for the explosive increase in traffic loads. However, it leads to be a large cost impact for(More)
Millimeter-wave Wireless LAN and its Extension toward 5G Heterogeneous Networks Kei SAKAGUCHI†, member, Ehab Mahmoud MOHAMED†, ††, non-member, Hideyuki KUSANO†, member, Makoto MIZUKAMI†††, member, Shinichi MIYAMOTO†, member, Roya REZAGAH†††, non-member, Koji TAKINAMI, Kazuaki TAKAHASHI, members††††, Naganori SHIRAKATA††††, non-member, Hailan PENG, Toshiaki(More)
Broadband fixed wireless access (BFWA) networks with Multipoint-to-Multipoint (MP-MP) systems of mesh topology have recently been considered as a promising approach to realize high quality and high performance networks. Needless to say, it is of prime importance to adopt an effective frequency assignment method suitable for MP-MP systems in order to make(More)