Paper Abstract and Keywords |
Presentation |
2014-03-03 16:40
QZSS Short Message SS-CDMA Communication : Access Control with Reserve Channel Tomohide Takahashi, Yuji Miyake, Suguru Kameda, Akinori Taira (Tohoku Univ), Fumihiro Yamagata (Kushiro National College of Technology), Hiroshi Oguma (Toyama National College of Technology), Noriharu Suematsu, Tadashi Takagi, Kazuo Tsubouchi (Tohoku Univ) RCS2013-332 |
Abstract |
(in Japanese) |
(See Japanese page) |
(in English) |
Quasi-Zenith Satellite System (QZSS) is expected to provide a high accurate positioning service and allows two-way communication which includes the terminal location and short messages. We have proposed Flag
method as an access control scheme designed for QZSS short message SS-CDMA communication. By applying Flag method to Frame Slotted ALOHA, the optimal channel efficiency of random access condition can be achieved constantly.
However, it remains low even in optimum condition. In this paper, we propose reservation channel (R-Ch) as an access control scheme which improve an upper limit of channel efficiency. Necessary time of accommodating 3 million mobile terminals when using Flag method only and R-Ch and Flag method are shown. R-Ch and Flag method can reduce the time by half compared with Flag method only. |
Keyword |
(in Japanese) |
(See Japanese page) |
(in English) |
Quasi-Zenith Satellite System (QZSS) / satellite communication / Global Positioning System (GPS) / Spread Spectrum Code Division Multiple Access (SS-CDMA) / access control / / / |
Reference Info. |
IEICE Tech. Rep., vol. 113, no. 456, RCS2013-332, pp. 157-162, March 2014. |
Paper # |
RCS2013-332 |
Date of Issue |
2014-02-24 (RCS) |
ISSN |
Print edition: ISSN 0913-5685 Online edition: ISSN 2432-6380 |
Copyright and reproduction |
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RCS2013-332 |